lib/nss_wrapper/nss_wrapper.c

   1 /*
   2  * Copyright (C) Stefan Metzmacher 2007 <metze@samba.org>
   3  * Copyright (C) Guenther Deschner 2009 <gd@samba.org>
   4  * Copyright (C) Andreas Schneider 2013 <asn@samba.org>
   5  *
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the author nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include "config.h"
  37
  38 #include <pthread.h>
  39
  40 #include <sys/types.h>
  41 #include <sys/stat.h>
  42 #include <sys/socket.h>
  43 #include <errno.h>
  44 #include <fcntl.h>
  45 #include <stdarg.h>
  46 #include <stdbool.h>
  47 #include <stddef.h>
  48 #include <stdio.h>
  49 #include <stdint.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52 #include <unistd.h>
  53 #include <ctype.h>
  54
  55 #include <netinet/in.h>
  56
  57 #include <search.h>
  58 #include <assert.h>
  59
  60 /*
  61  * Defining _POSIX_PTHREAD_SEMANTICS before including pwd.h and grp.h  gives us
  62  * the posix getpwnam_r(), getpwuid_r(), getgrnam_r and getgrgid_r calls on
  63  * Solaris
  64  */
  65 #ifndef _POSIX_PTHREAD_SEMANTICS
  66 #define _POSIX_PTHREAD_SEMANTICS
  67 #endif
  68
  69 #include <pwd.h>
  70 #include <grp.h>
  71 #ifdef HAVE_SHADOW_H
  72 #include <shadow.h>
  73 #endif /* HAVE_SHADOW_H */
  74
  75 #include <netdb.h>
  76 #include <arpa/inet.h>
  77 #include <netinet/in.h>
  78
  79 #include <dlfcn.h>
  80
  81 #if defined(HAVE_NSS_H)
  82 /* Linux and BSD */
  83 #include <nss.h>
  84
  85 typedef enum nss_status NSS_STATUS;
  86 #elif defined(HAVE_NSS_COMMON_H)
  87 /* Solaris */
  88 #include <nss_common.h>
  89 #include <nss_dbdefs.h>
  90 #include <nsswitch.h>
  91
  92 typedef nss_status_t NSS_STATUS;
  93
  94 # define NSS_STATUS_SUCCESS     NSS_SUCCESS
  95 # define NSS_STATUS_NOTFOUND    NSS_NOTFOUND
  96 # define NSS_STATUS_UNAVAIL     NSS_UNAVAIL
  97 # define NSS_STATUS_TRYAGAIN    NSS_TRYAGAIN
  98 #else
  99 # error "No nsswitch support detected"
 100 #endif
 101
 102 #ifndef PTR_DIFF
 103 #define PTR_DIFF(p1, p2) ((ptrdiff_t)(((const char *)(p1)) - (const char *)(p2)))
 104 #endif
 105
 106 #ifndef _PUBLIC_
 107 #define _PUBLIC_
 108 #endif
 109
 110 #ifndef EAI_NODATA
 111 #define EAI_NODATA EAI_NONAME
 112 #endif
 113
 114 #ifndef EAI_ADDRFAMILY
 115 #define EAI_ADDRFAMILY EAI_FAMILY
 116 #endif
 117
 118 #ifndef __STRING
 119 #define __STRING(x)    #x
 120 #endif
 121
 122 #ifndef __STRINGSTRING
 123 #define __STRINGSTRING(x) __STRING(x)
 124 #endif
 125
 126 #ifndef __LINESTR__
 127 #define __LINESTR__ __STRINGSTRING(__LINE__)
 128 #endif
 129
 130 #ifndef __location__
 131 #define __location__ __FILE__ ":" __LINESTR__
 132 #endif
 133
 134 #ifndef DNS_NAME_MAX
 135 #define DNS_NAME_MAX 255
 136 #endif
 137
 138 /* GCC have printf type attribute check. */
 139 #ifdef HAVE_ATTRIBUTE_PRINTF_FORMAT
 140 #define PRINTF_ATTRIBUTE(a,b) __attribute__ ((__format__ (__printf__, a, b)))
 141 #else
 142 #define PRINTF_ATTRIBUTE(a,b)
 143 #endif /* HAVE_ATTRIBUTE_PRINTF_FORMAT */
 144
 145 #ifdef HAVE_DESTRUCTOR_ATTRIBUTE
 146 #define DESTRUCTOR_ATTRIBUTE __attribute__ ((destructor))
 147 #else
 148 #define DESTRUCTOR_ATTRIBUTE
 149 #endif /* HAVE_DESTRUCTOR_ATTRIBUTE */
 150
 151 #define ZERO_STRUCTP(x) do { if ((x) != NULL) memset((char *)(x), 0, sizeof(*(x))); } while(0)
 152
 153 #ifndef SAFE_FREE
 154 #define SAFE_FREE(x) do { if ((x) != NULL) {free(x); (x)=NULL;} } while(0)
 155 #endif
 156
 157 #ifdef HAVE_IPV6
 158 #define NWRAP_INET_ADDRSTRLEN INET6_ADDRSTRLEN
 159 #else
 160 #define NWRAP_INET_ADDRSTRLEN INET_ADDRSTRLEN
 161 #endif
 162
 163 #define NWRAP_LOCK(m) do { \
 164         pthread_mutex_lock(&( m ## _mutex)); \
 165 } while(0)
 166
 167 #define NWRAP_UNLOCK(m) do { \
 168         pthread_mutex_unlock(&( m ## _mutex)); \
 169 } while(0)
 170
 171
 172 static bool nwrap_initialized = false;
 173 static pthread_mutex_t nwrap_initialized_mutex = PTHREAD_MUTEX_INITIALIZER;
 174
 175 /* The mutex or accessing the id */
 176 static pthread_mutex_t nwrap_global_mutex = PTHREAD_MUTEX_INITIALIZER;
 177 static pthread_mutex_t nwrap_gr_global_mutex = PTHREAD_MUTEX_INITIALIZER;
 178 static pthread_mutex_t nwrap_he_global_mutex = PTHREAD_MUTEX_INITIALIZER;
 179 static pthread_mutex_t nwrap_pw_global_mutex = PTHREAD_MUTEX_INITIALIZER;
 180 static pthread_mutex_t nwrap_sp_global_mutex = PTHREAD_MUTEX_INITIALIZER;
 181
 182 /* Add new global locks here please */
 183 /* Also don't forget to add locks to
 184  * nwrap_init() function.
 185  */
 186 # define NWRAP_LOCK_ALL do { \
 187         NWRAP_LOCK(nwrap_initialized); \
 188         NWRAP_LOCK(nwrap_global); \
 189         NWRAP_LOCK(nwrap_gr_global); \
 190         NWRAP_LOCK(nwrap_he_global); \
 191         NWRAP_LOCK(nwrap_pw_global); \
 192         NWRAP_LOCK(nwrap_sp_global); \
 193 } while (0);
 194
 195 # define NWRAP_UNLOCK_ALL do {\
 196         NWRAP_UNLOCK(nwrap_sp_global); \
 197         NWRAP_UNLOCK(nwrap_pw_global); \
 198         NWRAP_UNLOCK(nwrap_he_global); \
 199         NWRAP_UNLOCK(nwrap_gr_global); \
 200         NWRAP_UNLOCK(nwrap_global); \
 201         NWRAP_UNLOCK(nwrap_initialized); \
 202 } while (0);
 203
 204 static void nwrap_thread_prepare(void)
 205 {
 206         NWRAP_LOCK_ALL;
 207 }
 208
 209 static void nwrap_thread_parent(void)
 210 {
 211         NWRAP_UNLOCK_ALL;
 212 }
 213
 214 static void nwrap_thread_child(void)
 215 {
 216         NWRAP_UNLOCK_ALL;
 217 }
 218
 219 enum nwrap_dbglvl_e {
 220         NWRAP_LOG_ERROR = 0,
 221         NWRAP_LOG_WARN,
 222         NWRAP_LOG_DEBUG,
 223         NWRAP_LOG_TRACE
 224 };
 225
 226 #ifdef NDEBUG
 227 # define NWRAP_LOG(...)
 228 #else
 229
 230 static void nwrap_log(enum nwrap_dbglvl_e dbglvl, const char *func, const char *format, ...) PRINTF_ATTRIBUTE(3, 4);
 231 # define NWRAP_LOG(dbglvl, ...) nwrap_log((dbglvl), __func__, __VA_ARGS__)
 232
 233 static void nwrap_log(enum nwrap_dbglvl_e dbglvl,
 234                       const char *func,
 235                       const char *format, ...)
 236 {
 237         char buffer[1024];
 238         va_list va;
 239         const char *d;
 240         unsigned int lvl = 0;
 241         int pid = getpid();
 242
 243         d = getenv("NSS_WRAPPER_DEBUGLEVEL");
 244         if (d != NULL) {
 245                 lvl = atoi(d);
 246         }
 247
 248         va_start(va, format);
 249         vsnprintf(buffer, sizeof(buffer), format, va);
 250         va_end(va);
 251
 252         if (lvl >= dbglvl) {
 253                 switch (dbglvl) {
 254                         case NWRAP_LOG_ERROR:
 255                                 fprintf(stderr,
 256                                         "NWRAP_ERROR(%d) - %s: %s\n",
 257                                         pid, func, buffer);
 258                                 break;
 259                         case NWRAP_LOG_WARN:
 260                                 fprintf(stderr,
 261                                         "NWRAP_WARN(%d) - %s: %s\n",
 262                                         pid, func, buffer);
 263                                 break;
 264                         case NWRAP_LOG_DEBUG:
 265                                 fprintf(stderr,
 266                                         "NWRAP_DEBUG(%d) - %s: %s\n",
 267                                         pid, func, buffer);
 268                                 break;
 269                         case NWRAP_LOG_TRACE:
 270                                 fprintf(stderr,
 271                                         "NWRAP_TRACE(%d) - %s: %s\n",
 272                                         pid, func, buffer);
 273                                 break;
 274                 }
 275         }
 276 }
 277 #endif /* NDEBUG NWRAP_LOG */
 278
 279 struct nwrap_libc_fns {
 280         struct passwd *(*_libc_getpwnam)(const char *name);
 281         int (*_libc_getpwnam_r)(const char *name, struct passwd *pwd,
 282                        char *buf, size_t buflen, struct passwd **result);
 283         struct passwd *(*_libc_getpwuid)(uid_t uid);
 284         int (*_libc_getpwuid_r)(uid_t uid, struct passwd *pwd, char *buf, size_t buflen, struct passwd **result);
 285         void (*_libc_setpwent)(void);
 286         struct passwd *(*_libc_getpwent)(void);
 287 #ifdef HAVE_SOLARIS_GETPWENT_R
 288         struct passwd *(*_libc_getpwent_r)(struct passwd *pwbuf, char *buf, size_t buflen);
 289 #else
 290         int (*_libc_getpwent_r)(struct passwd *pwbuf, char *buf, size_t buflen, struct passwd **pwbufp);
 291 #endif
 292         void (*_libc_endpwent)(void);
 293         int (*_libc_initgroups)(const char *user, gid_t gid);
 294         struct group *(*_libc_getgrnam)(const char *name);
 295         int (*_libc_getgrnam_r)(const char *name, struct group *grp, char *buf, size_t buflen, struct group **result);
 296         struct group *(*_libc_getgrgid)(gid_t gid);
 297         int (*_libc_getgrgid_r)(gid_t gid, struct group *grp, char *buf, size_t buflen, struct group **result);
 298         void (*_libc_setgrent)(void);
 299         struct group *(*_libc_getgrent)(void);
 300 #ifdef HAVE_SOLARIS_GETGRENT_R
 301         struct group *(*_libc_getgrent_r)(struct group *group, char *buf, size_t buflen);
 302 #else
 303         int (*_libc_getgrent_r)(struct group *group, char *buf, size_t buflen, struct group **result);
 304 #endif
 305         void (*_libc_endgrent)(void);
 306         int (*_libc_getgrouplist)(const char *user, gid_t group, gid_t *groups, int *ngroups);
 307
 308         void (*_libc_sethostent)(int stayopen);
 309         struct hostent *(*_libc_gethostent)(void);
 310         void (*_libc_endhostent)(void);
 311
 312         struct hostent *(*_libc_gethostbyname)(const char *name);
 313 #ifdef HAVE_GETHOSTBYNAME2 /* GNU extension */
 314         struct hostent *(*_libc_gethostbyname2)(const char *name, int af);
 315 #endif
 316         struct hostent *(*_libc_gethostbyaddr)(const void *addr, socklen_t len, int type);
 317
 318         int (*_libc_getaddrinfo)(const char *node, const char *service,
 319                                  const struct addrinfo *hints,
 320                                  struct addrinfo **res);
 321         int (*_libc_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
 322                                  char *host, size_t hostlen,
 323                                  char *serv, size_t servlen,
 324                                  int flags);
 325         int (*_libc_gethostname)(char *name, size_t len);
 326 #ifdef HAVE_GETHOSTBYNAME_R
 327         int (*_libc_gethostbyname_r)(const char *name,
 328                                      struct hostent *ret,
 329                                      char *buf, size_t buflen,
 330                                      struct hostent **result, int *h_errnop);
 331 #endif
 332 #ifdef HAVE_GETHOSTBYADDR_R
 333         int (*_libc_gethostbyaddr_r)(const void *addr, socklen_t len, int type,
 334                                      struct hostent *ret,
 335                                      char *buf, size_t buflen,
 336                                      struct hostent **result, int *h_errnop);
 337 #endif
 338 };
 339
 340 struct nwrap_module_nss_fns {
 341         NSS_STATUS (*_nss_getpwnam_r)(const char *name, struct passwd *result, char *buffer,
 342                                       size_t buflen, int *errnop);
 343         NSS_STATUS (*_nss_getpwuid_r)(uid_t uid, struct passwd *result, char *buffer,
 344                                       size_t buflen, int *errnop);
 345         NSS_STATUS (*_nss_setpwent)(void);
 346         NSS_STATUS (*_nss_getpwent_r)(struct passwd *result, char *buffer,
 347                                       size_t buflen, int *errnop);
 348         NSS_STATUS (*_nss_endpwent)(void);
 349         NSS_STATUS (*_nss_initgroups)(const char *user, gid_t group, long int *start,
 350                                       long int *size, gid_t **groups, long int limit, int *errnop);
 351         NSS_STATUS (*_nss_getgrnam_r)(const char *name, struct group *result, char *buffer,
 352                                       size_t buflen, int *errnop);
 353         NSS_STATUS (*_nss_getgrgid_r)(gid_t gid, struct group *result, char *buffer,
 354                                       size_t buflen, int *errnop);
 355         NSS_STATUS (*_nss_setgrent)(void);
 356         NSS_STATUS (*_nss_getgrent_r)(struct group *result, char *buffer,
 357                                       size_t buflen, int *errnop);
 358         NSS_STATUS (*_nss_endgrent)(void);
 359 };
 360
 361 struct nwrap_backend {
 362         const char *name;
 363         const char *so_path;
 364         void *so_handle;
 365         struct nwrap_ops *ops;
 366         struct nwrap_module_nss_fns *fns;
 367 };
 368
 369 struct nwrap_ops {
 370         struct passwd * (*nw_getpwnam)(struct nwrap_backend *b,
 371                                        const char *name);
 372         int             (*nw_getpwnam_r)(struct nwrap_backend *b,
 373                                          const char *name, struct passwd *pwdst,
 374                                          char *buf, size_t buflen, struct passwd **pwdstp);
 375         struct passwd * (*nw_getpwuid)(struct nwrap_backend *b,
 376                                        uid_t uid);
 377         int             (*nw_getpwuid_r)(struct nwrap_backend *b,
 378                                          uid_t uid, struct passwd *pwdst,
 379                                          char *buf, size_t buflen, struct passwd **pwdstp);
 380         void            (*nw_setpwent)(struct nwrap_backend *b);
 381         struct passwd * (*nw_getpwent)(struct nwrap_backend *b);
 382         int             (*nw_getpwent_r)(struct nwrap_backend *b,
 383                                          struct passwd *pwdst, char *buf,
 384                                          size_t buflen, struct passwd **pwdstp);
 385         void            (*nw_endpwent)(struct nwrap_backend *b);
 386         int             (*nw_initgroups)(struct nwrap_backend *b,
 387                                          const char *user, gid_t group);
 388         struct group *  (*nw_getgrnam)(struct nwrap_backend *b,
 389                                        const char *name);
 390         int             (*nw_getgrnam_r)(struct nwrap_backend *b,
 391                                          const char *name, struct group *grdst,
 392                                          char *buf, size_t buflen, struct group **grdstp);
 393         struct group *  (*nw_getgrgid)(struct nwrap_backend *b,
 394                                        gid_t gid);
 395         int             (*nw_getgrgid_r)(struct nwrap_backend *b,
 396                                          gid_t gid, struct group *grdst,
 397                                          char *buf, size_t buflen, struct group **grdstp);
 398         void            (*nw_setgrent)(struct nwrap_backend *b);
 399         struct group *  (*nw_getgrent)(struct nwrap_backend *b);
 400         int             (*nw_getgrent_r)(struct nwrap_backend *b,
 401                                          struct group *grdst, char *buf,
 402                                          size_t buflen, struct group **grdstp);
 403         void            (*nw_endgrent)(struct nwrap_backend *b);
 404 };
 405
 406 /* Public prototypes */
 407
 408 bool nss_wrapper_enabled(void);
 409 bool nss_wrapper_shadow_enabled(void);
 410 bool nss_wrapper_hosts_enabled(void);
 411
 412 /* prototypes for files backend */
 413
 414
 415 static struct passwd *nwrap_files_getpwnam(struct nwrap_backend *b,
 416                                            const char *name);
 417 static int nwrap_files_getpwnam_r(struct nwrap_backend *b,
 418                                   const char *name, struct passwd *pwdst,
 419                                   char *buf, size_t buflen, struct passwd **pwdstp);
 420 static struct passwd *nwrap_files_getpwuid(struct nwrap_backend *b,
 421                                            uid_t uid);
 422 static int nwrap_files_getpwuid_r(struct nwrap_backend *b,
 423                                   uid_t uid, struct passwd *pwdst,
 424                                   char *buf, size_t buflen, struct passwd **pwdstp);
 425 static void nwrap_files_setpwent(struct nwrap_backend *b);
 426 static struct passwd *nwrap_files_getpwent(struct nwrap_backend *b);
 427 static int nwrap_files_getpwent_r(struct nwrap_backend *b,
 428                                   struct passwd *pwdst, char *buf,
 429                                   size_t buflen, struct passwd **pwdstp);
 430 static void nwrap_files_endpwent(struct nwrap_backend *b);
 431 static int nwrap_files_initgroups(struct nwrap_backend *b,
 432                                   const char *user, gid_t group);
 433 static struct group *nwrap_files_getgrnam(struct nwrap_backend *b,
 434                                           const char *name);
 435 static int nwrap_files_getgrnam_r(struct nwrap_backend *b,
 436                                   const char *name, struct group *grdst,
 437                                   char *buf, size_t buflen, struct group **grdstp);
 438 static struct group *nwrap_files_getgrgid(struct nwrap_backend *b,
 439                                           gid_t gid);
 440 static int nwrap_files_getgrgid_r(struct nwrap_backend *b,
 441                                   gid_t gid, struct group *grdst,
 442                                   char *buf, size_t buflen, struct group **grdstp);
 443 static void nwrap_files_setgrent(struct nwrap_backend *b);
 444 static struct group *nwrap_files_getgrent(struct nwrap_backend *b);
 445 static int nwrap_files_getgrent_r(struct nwrap_backend *b,
 446                                   struct group *grdst, char *buf,
 447                                   size_t buflen, struct group **grdstp);
 448 static void nwrap_files_endgrent(struct nwrap_backend *b);
 449
 450 /* prototypes for module backend */
 451
 452 static struct passwd *nwrap_module_getpwent(struct nwrap_backend *b);
 453 static int nwrap_module_getpwent_r(struct nwrap_backend *b,
 454                                    struct passwd *pwdst, char *buf,
 455                                    size_t buflen, struct passwd **pwdstp);
 456 static struct passwd *nwrap_module_getpwnam(struct nwrap_backend *b,
 457                                             const char *name);
 458 static int nwrap_module_getpwnam_r(struct nwrap_backend *b,
 459                                    const char *name, struct passwd *pwdst,
 460                                    char *buf, size_t buflen, struct passwd **pwdstp);
 461 static struct passwd *nwrap_module_getpwuid(struct nwrap_backend *b,
 462                                             uid_t uid);
 463 static int nwrap_module_getpwuid_r(struct nwrap_backend *b,
 464                                    uid_t uid, struct passwd *pwdst,
 465                                    char *buf, size_t buflen, struct passwd **pwdstp);
 466 static void nwrap_module_setpwent(struct nwrap_backend *b);
 467 static void nwrap_module_endpwent(struct nwrap_backend *b);
 468 static struct group *nwrap_module_getgrent(struct nwrap_backend *b);
 469 static int nwrap_module_getgrent_r(struct nwrap_backend *b,
 470                                    struct group *grdst, char *buf,
 471                                    size_t buflen, struct group **grdstp);
 472 static struct group *nwrap_module_getgrnam(struct nwrap_backend *b,
 473                                            const char *name);
 474 static int nwrap_module_getgrnam_r(struct nwrap_backend *b,
 475                                    const char *name, struct group *grdst,
 476                                    char *buf, size_t buflen, struct group **grdstp);
 477 static struct group *nwrap_module_getgrgid(struct nwrap_backend *b,
 478                                            gid_t gid);
 479 static int nwrap_module_getgrgid_r(struct nwrap_backend *b,
 480                                    gid_t gid, struct group *grdst,
 481                                    char *buf, size_t buflen, struct group **grdstp);
 482 static void nwrap_module_setgrent(struct nwrap_backend *b);
 483 static void nwrap_module_endgrent(struct nwrap_backend *b);
 484 static int nwrap_module_initgroups(struct nwrap_backend *b,
 485                                    const char *user, gid_t group);
 486
 487 struct nwrap_ops nwrap_files_ops = {
 488         .nw_getpwnam    = nwrap_files_getpwnam,
 489         .nw_getpwnam_r  = nwrap_files_getpwnam_r,
 490         .nw_getpwuid    = nwrap_files_getpwuid,
 491         .nw_getpwuid_r  = nwrap_files_getpwuid_r,
 492         .nw_setpwent    = nwrap_files_setpwent,
 493         .nw_getpwent    = nwrap_files_getpwent,
 494         .nw_getpwent_r  = nwrap_files_getpwent_r,
 495         .nw_endpwent    = nwrap_files_endpwent,
 496         .nw_initgroups  = nwrap_files_initgroups,
 497         .nw_getgrnam    = nwrap_files_getgrnam,
 498         .nw_getgrnam_r  = nwrap_files_getgrnam_r,
 499         .nw_getgrgid    = nwrap_files_getgrgid,
 500         .nw_getgrgid_r  = nwrap_files_getgrgid_r,
 501         .nw_setgrent    = nwrap_files_setgrent,
 502         .nw_getgrent    = nwrap_files_getgrent,
 503         .nw_getgrent_r  = nwrap_files_getgrent_r,
 504         .nw_endgrent    = nwrap_files_endgrent,
 505 };
 506
 507 struct nwrap_ops nwrap_module_ops = {
 508         .nw_getpwnam    = nwrap_module_getpwnam,
 509         .nw_getpwnam_r  = nwrap_module_getpwnam_r,
 510         .nw_getpwuid    = nwrap_module_getpwuid,
 511         .nw_getpwuid_r  = nwrap_module_getpwuid_r,
 512         .nw_setpwent    = nwrap_module_setpwent,
 513         .nw_getpwent    = nwrap_module_getpwent,
 514         .nw_getpwent_r  = nwrap_module_getpwent_r,
 515         .nw_endpwent    = nwrap_module_endpwent,
 516         .nw_initgroups  = nwrap_module_initgroups,
 517         .nw_getgrnam    = nwrap_module_getgrnam,
 518         .nw_getgrnam_r  = nwrap_module_getgrnam_r,
 519         .nw_getgrgid    = nwrap_module_getgrgid,
 520         .nw_getgrgid_r  = nwrap_module_getgrgid_r,
 521         .nw_setgrent    = nwrap_module_setgrent,
 522         .nw_getgrent    = nwrap_module_getgrent,
 523         .nw_getgrent_r  = nwrap_module_getgrent_r,
 524         .nw_endgrent    = nwrap_module_endgrent,
 525 };
 526
 527 struct nwrap_libc {
 528         void *handle;
 529         void *nsl_handle;
 530         void *sock_handle;
 531         struct nwrap_libc_fns *fns;
 532 };
 533
 534 struct nwrap_main {
 535         int num_backends;
 536         struct nwrap_backend *backends;
 537         struct nwrap_libc *libc;
 538 };
 539
 540 static struct nwrap_main *nwrap_main_global;
 541 static struct nwrap_main __nwrap_main_global;
 542
 543 /*
 544  * PROTOTYPES
 545  */
 546 static int nwrap_convert_he_ai(const struct hostent *he,
 547                                unsigned short port,
 548                                const struct addrinfo *hints,
 549                                struct addrinfo **pai,
 550                                bool skip_canonname);
 551
 552 /*
 553  * VECTORS
 554  */
 555
 556 #define DEFAULT_VECTOR_CAPACITY 16
 557
 558 struct nwrap_vector {
 559         void **items;
 560         size_t count;
 561         size_t capacity;
 562 };
 563
 564 /* Macro returns pointer to first element of vector->items array.
 565  *
 566  * nwrap_vector is used as a memory backend which take care of
 567  * memory allocations and other stuff like memory growing.
 568  * nwrap_vectors should not be considered as some abstract structures.
 569  * On this level, vectors are more handy than direct realloc/malloc
 570  * calls.
 571  *
 572  * nwrap_vector->items is array inside nwrap_vector which can be
 573  * directly pointed by libc structure assembled by cwrap itself.
 574  *
 575  * EXAMPLE:
 576  *
 577  * 1) struct hostent contains char **h_addr_list element.
 578  * 2) nwrap_vector holds array of pointers to addresses.
 579  *    It's easier to use vector to store results of
 580  *    file parsing etc.
 581  *
 582  * Now, pretend that cwrap assembled struct hostent and
 583  * we need to set h_addr_list to point to nwrap_vector.
 584  * Idea behind is to shield users from internal nwrap_vector
 585  * implementation.
 586  * (Yes, not fully - array terminated by NULL is needed because
 587  * it's result expected by libc function caller.)
 588  *
 589  *
 590  * CODE EXAMPLE:
 591  *
 592  * struct hostent he;
 593  * struct nwrap_vector *vector = malloc(sizeof(struct nwrap_vector));
 594  * ... don't care about failed allocation now ...
 595  *
 596  * ... fill nwrap vector ...
 597  *
 598  * struct hostent he;
 599  * he.h_addr_list = nwrap_vector_head(vector);
 600  *
 601  */
 602 #define nwrap_vector_head(vect) ((void *)((vect)->items))
 603
 604 #define nwrap_vector_foreach(item, vect, iter) \
 605         for (iter = 0, (item) = (vect).items == NULL ? NULL : (vect).items[0]; \
 606              item != NULL; \
 607              (item) = (vect).items[++iter])
 608
 609 #define nwrap_vector_is_initialized(vector) ((vector)->items != NULL)
 610
 611 static inline bool nwrap_vector_init(struct nwrap_vector *const vector)
 612 {
 613         if (vector == NULL) {
 614                 return false;
 615         }
 616
 617         /* count is initialized by ZERO_STRUCTP */
 618         ZERO_STRUCTP(vector);
 619         vector->items = malloc(sizeof(void *) * (DEFAULT_VECTOR_CAPACITY + 1));
 620         if (vector->items == NULL) {
 621                 return false;
 622         }
 623         vector->capacity = DEFAULT_VECTOR_CAPACITY;
 624         memset(vector->items, '\0', sizeof(void *) * (DEFAULT_VECTOR_CAPACITY + 1));
 625
 626         return true;
 627 }
 628
 629 static bool nwrap_vector_add_item(struct nwrap_vector *vector, void *const item)
 630 {
 631         assert (vector != NULL);
 632
 633         if (vector->items == NULL) {
 634                 nwrap_vector_init(vector);
 635         }
 636
 637         if (vector->count == vector->capacity) {
 638                 /* Items array _MUST_ be NULL terminated because it's passed
 639                  * as result to caller which expect NULL terminated array from libc.
 640                  */
 641                 void **items = realloc(vector->items, sizeof(void *) * ((vector->capacity * 2) + 1));
 642                 if (items == NULL) {
 643                         return false;
 644                 }
 645                 vector->items = items;
 646
 647                 /* Don't count ending NULL to capacity */
 648                 vector->capacity *= 2;
 649         }
 650
 651         vector->items[vector->count] = item;
 652
 653         vector->count += 1;
 654         vector->items[vector->count] = NULL;
 655
 656         return true;
 657 }
 658
 659 static bool nwrap_vector_merge(struct nwrap_vector *dst,
 660                                struct nwrap_vector *src)
 661 {
 662         void **dst_items = NULL;
 663         size_t count;
 664
 665         if (src->count == 0) {
 666                 return true;
 667         }
 668
 669         count = dst->count + src->count;
 670
 671         /* We don't need reallocation if we have enough capacity. */
 672         if (src->count > (dst->capacity - dst->count)) {
 673                 dst_items = (void **)realloc(dst->items, (count + 1) * sizeof(void *));
 674                 if (dst_items == NULL) {
 675                         return false;
 676                 }
 677                 dst->items = dst_items;
 678                 dst->capacity = count;
 679         }
 680
 681         memcpy((void *)(((long *)dst->items) + dst->count),
 682                src->items,
 683                src->count * sizeof(void *));
 684         dst->count = count;
 685
 686         return true;
 687 }
 688
 689 struct nwrap_cache {
 690         const char *path;
 691         int fd;
 692         FILE *fp;
 693         struct stat st;
 694         void *private_data;
 695
 696         struct nwrap_vector lines;
 697
 698         bool (*parse_line)(struct nwrap_cache *, char *line);
 699         void (*unload)(struct nwrap_cache *);
 700 };
 701
 702 /* passwd */
 703 struct nwrap_pw {
 704         struct nwrap_cache *cache;
 705
 706         struct passwd *list;
 707         int num;
 708         int idx;
 709 };
 710
 711 struct nwrap_cache __nwrap_cache_pw;
 712 struct nwrap_pw nwrap_pw_global;
 713
 714 static bool nwrap_pw_parse_line(struct nwrap_cache *nwrap, char *line);
 715 static void nwrap_pw_unload(struct nwrap_cache *nwrap);
 716
 717 /* shadow */
 718 #if defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM)
 719 struct nwrap_sp {
 720         struct nwrap_cache *cache;
 721
 722         struct spwd *list;
 723         int num;
 724         int idx;
 725 };
 726
 727 struct nwrap_cache __nwrap_cache_sp;
 728 struct nwrap_sp nwrap_sp_global;
 729
 730 static bool nwrap_sp_parse_line(struct nwrap_cache *nwrap, char *line);
 731 static void nwrap_sp_unload(struct nwrap_cache *nwrap);
 732 #endif /* defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM) */
 733
 734 /* group */
 735 struct nwrap_gr {
 736         struct nwrap_cache *cache;
 737
 738         struct group *list;
 739         int num;
 740         int idx;
 741 };
 742
 743 struct nwrap_cache __nwrap_cache_gr;
 744 struct nwrap_gr nwrap_gr_global;
 745
 746 /* hosts */
 747 static bool nwrap_he_parse_line(struct nwrap_cache *nwrap, char *line);
 748 static void nwrap_he_unload(struct nwrap_cache *nwrap);
 749
 750 struct nwrap_addrdata {
 751         unsigned char host_addr[16]; /* IPv4 or IPv6 address */
 752 };
 753
 754 static size_t max_hostents = 100;
 755
 756 struct nwrap_entdata {
 757         struct nwrap_addrdata addr;
 758         struct hostent ht;
 759
 760         struct nwrap_vector nwrap_addrdata;
 761
 762         ssize_t aliases_count;
 763 };
 764
 765 struct nwrap_entlist {
 766         struct nwrap_entlist *next;
 767         struct nwrap_entdata *ed;
 768 };
 769
 770 struct nwrap_he {
 771         struct nwrap_cache *cache;
 772
 773         struct nwrap_vector entries;
 774         struct nwrap_vector lists;
 775
 776         int num;
 777         int idx;
 778 };
 779
 780 static struct nwrap_cache __nwrap_cache_he;
 781 static struct nwrap_he nwrap_he_global;
 782
 783
 784 /*********************************************************
 785  * NWRAP PROTOTYPES
 786  *********************************************************/
 787
 788 static void nwrap_init(void);
 789 static bool nwrap_gr_parse_line(struct nwrap_cache *nwrap, char *line);
 790 static void nwrap_gr_unload(struct nwrap_cache *nwrap);
 791 void nwrap_destructor(void) DESTRUCTOR_ATTRIBUTE;
 792
 793 /*********************************************************
 794  * NWRAP LIBC LOADER FUNCTIONS
 795  *********************************************************/
 796
 797 enum nwrap_lib {
 798     NWRAP_LIBC,
 799     NWRAP_LIBNSL,
 800     NWRAP_LIBSOCKET,
 801 };
 802
 803 #ifndef NDEBUG
 804 static const char *nwrap_str_lib(enum nwrap_lib lib)
 805 {
 806         switch (lib) {
 807         case NWRAP_LIBC:
 808                 return "libc";
 809         case NWRAP_LIBNSL:
 810                 return "libnsl";
 811         case NWRAP_LIBSOCKET:
 812                 return "libsocket";
 813         }
 814
 815         /* Compiler would warn us about unhandled enum value if we get here */
 816         return "unknown";
 817 }
 818 #endif
 819
 820 static void *nwrap_load_lib_handle(enum nwrap_lib lib)
 821 {
 822         int flags = RTLD_LAZY;
 823         void *handle = NULL;
 824         int i;
 825
 826 #ifdef RTLD_DEEPBIND
 827         flags |= RTLD_DEEPBIND;
 828 #endif
 829
 830         switch (lib) {
 831         case NWRAP_LIBNSL:
 832 #ifdef HAVE_LIBNSL
 833                 handle = nwrap_main_global->libc->nsl_handle;
 834                 if (handle == NULL) {
 835                         for (i = 10; i >= 0; i--) {
 836                                 char soname[256] = {0};
 837
 838                                 snprintf(soname, sizeof(soname), "libnsl.so.%d", i);
 839                                 handle = dlopen(soname, flags);
 840                                 if (handle != NULL) {
 841                                         break;
 842                                 }
 843                         }
 844
 845                         nwrap_main_global->libc->nsl_handle = handle;
 846                 }
 847                 break;
 848 #endif
 849                 /* FALL TROUGH */
 850         case NWRAP_LIBSOCKET:
 851 #ifdef HAVE_LIBSOCKET
 852                 handle = nwrap_main_global->libc->sock_handle;
 853                 if (handle == NULL) {
 854                         for (i = 10; i >= 0; i--) {
 855                                 char soname[256] = {0};
 856
 857                                 snprintf(soname, sizeof(soname), "libsocket.so.%d", i);
 858                                 handle = dlopen(soname, flags);
 859                                 if (handle != NULL) {
 860                                         break;
 861                                 }
 862                         }
 863
 864                         nwrap_main_global->libc->sock_handle = handle;
 865                 }
 866                 break;
 867 #endif
 868                 /* FALL TROUGH */
 869         case NWRAP_LIBC:
 870                 handle = nwrap_main_global->libc->handle;
 871                 if (handle == NULL) {
 872                         for (i = 10; i >= 0; i--) {
 873                                 char soname[256] = {0};
 874
 875                                 snprintf(soname, sizeof(soname), "libc.so.%d", i);
 876                                 handle = dlopen(soname, flags);
 877                                 if (handle != NULL) {
 878                                         break;
 879                                 }
 880                         }
 881
 882                         nwrap_main_global->libc->handle = handle;
 883                 }
 884                 break;
 885         }
 886
 887         if (handle == NULL) {
 888 #ifdef RTLD_NEXT
 889                 handle = nwrap_main_global->libc->handle
 890                        = nwrap_main_global->libc->sock_handle
 891                        = nwrap_main_global->libc->nsl_handle
 892                        = RTLD_NEXT;
 893 #else
 894                 NWRAP_LOG(NWRAP_LOG_ERROR,
 895                           "Failed to dlopen library: %s\n",
 896                           dlerror());
 897                 exit(-1);
 898 #endif
 899         }
 900
 901         return handle;
 902 }
 903
 904 static void *_nwrap_load_lib_function(enum nwrap_lib lib, const char *fn_name)
 905 {
 906         void *handle;
 907         void *func;
 908
 909         nwrap_init();
 910
 911         handle = nwrap_load_lib_handle(lib);
 912
 913         func = dlsym(handle, fn_name);
 914         if (func == NULL) {
 915                 NWRAP_LOG(NWRAP_LOG_ERROR,
 916                                 "Failed to find %s: %s\n",
 917                                 fn_name, dlerror());
 918                 exit(-1);
 919         }
 920
 921         NWRAP_LOG(NWRAP_LOG_TRACE,
 922                         "Loaded %s from %s",
 923                         fn_name, nwrap_str_lib(lib));
 924         return func;
 925 }
 926
 927 #define nwrap_load_lib_function(lib, fn_name) \
 928         if (nwrap_main_global->libc->fns->_libc_##fn_name == NULL) { \
 929                 *(void **) (&nwrap_main_global->libc->fns->_libc_##fn_name) = \
 930                         _nwrap_load_lib_function(lib, #fn_name); \
 931         }
 932
 933 /* INTERNAL HELPER FUNCTIONS */
 934 static void nwrap_lines_unload(struct nwrap_cache *const nwrap)
 935 {
 936         size_t p;
 937         void *item;
 938         nwrap_vector_foreach(item, nwrap->lines, p) {
 939                 /* Maybe some vectors were merged ... */
 940                 SAFE_FREE(item);
 941         }
 942         SAFE_FREE(nwrap->lines.items);
 943         ZERO_STRUCTP(&nwrap->lines);
 944 }
 945
 946 /*
 947  * IMPORTANT
 948  *
 949  * Functions expeciall from libc need to be loaded individually, you can't load
 950  * all at once or gdb will segfault at startup. The same applies to valgrind and
 951  * has probably something todo with with the linker.
 952  * So we need load each function at the point it is called the first time.
 953  */
 954 static struct passwd *libc_getpwnam(const char *name)
 955 {
 956         nwrap_load_lib_function(NWRAP_LIBC, getpwnam);
 957
 958         return nwrap_main_global->libc->fns->_libc_getpwnam(name);
 959 }
 960
 961 #ifdef HAVE_GETPWNAM_R
 962 static int libc_getpwnam_r(const char *name,
 963                            struct passwd *pwd,
 964                            char *buf,
 965                            size_t buflen,
 966                            struct passwd **result)
 967 {
 968 #ifdef HAVE___POSIX_GETPWNAM_R
 969         if (nwrap_main_global->libc->fns->_libc_getpwnam_r == NULL) {
 970                 *(void **) (&nwrap_main_global->libc->fns->_libc_getpwnam_r) =
 971                         _nwrap_load_lib_function(NWRAP_LIBC, "__posix_getpwnam_r");
 972         }
 973 #else
 974         nwrap_load_lib_function(NWRAP_LIBC, getpwnam_r);
 975 #endif
 976
 977         return nwrap_main_global->libc->fns->_libc_getpwnam_r(name,
 978                                                               pwd,
 979                                                               buf,
 980                                                               buflen,
 981                                                               result);
 982 }
 983 #endif
 984
 985 static struct passwd *libc_getpwuid(uid_t uid)
 986 {
 987         nwrap_load_lib_function(NWRAP_LIBC, getpwuid);
 988
 989         return nwrap_main_global->libc->fns->_libc_getpwuid(uid);
 990 }
 991
 992 #ifdef HAVE_GETPWUID_R
 993 static int libc_getpwuid_r(uid_t uid,
 994                            struct passwd *pwd,
 995                            char *buf,
 996                            size_t buflen,
 997                            struct passwd **result)
 998 {
 999 #ifdef HAVE___POSIX_GETPWUID_R
1000         if (nwrap_main_global->libc->fns->_libc_getpwuid_r == NULL) {
1001                 *(void **) (&nwrap_main_global->libc->fns->_libc_getpwuid_r) =
1002                         _nwrap_load_lib_function(NWRAP_LIBC, "__posix_getpwuid_r");
1003         }
1004 #else
1005         nwrap_load_lib_function(NWRAP_LIBC, getpwuid_r);
1006 #endif
1007
1008         return nwrap_main_global->libc->fns->_libc_getpwuid_r(uid,
1009                                                               pwd,
1010                                                               buf,
1011                                                               buflen,
1012                                                               result);
1013 }
1014 #endif
1015
1016 static inline void str_tolower(char *dst, char *src)
1017 {
1018         register char *src_tmp = src;
1019         register char *dst_tmp = dst;
1020
1021         while (*src_tmp != '\0') {
1022                 *dst_tmp = tolower(*src_tmp);
1023                 ++src_tmp;
1024                 ++dst_tmp;
1025         }
1026 }
1027
1028 static bool str_tolower_copy(char **dst_name, const char *const src_name)
1029 {
1030         char *h_name_lower;
1031
1032         if ((dst_name == NULL) || (src_name == NULL)) {
1033                 return false;
1034         }
1035
1036         h_name_lower = strdup(src_name);
1037         if (h_name_lower == NULL) {
1038                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Out of memory while strdup");
1039                 return false;
1040         }
1041
1042         str_tolower(h_name_lower, h_name_lower);
1043         *dst_name = h_name_lower;
1044         return true;
1045 }
1046
1047 static void libc_setpwent(void)
1048 {
1049         nwrap_load_lib_function(NWRAP_LIBC, setpwent);
1050
1051         nwrap_main_global->libc->fns->_libc_setpwent();
1052 }
1053
1054 static struct passwd *libc_getpwent(void)
1055 {
1056         nwrap_load_lib_function(NWRAP_LIBC, getpwent);
1057
1058         return nwrap_main_global->libc->fns->_libc_getpwent();
1059 }
1060
1061 #ifdef HAVE_SOLARIS_GETPWENT_R
1062 static struct passwd *libc_getpwent_r(struct passwd *pwdst,
1063                                       char *buf,
1064                                       int buflen)
1065 {
1066         nwrap_load_lib_function(NWRAP_LIBC, getpwent_r);
1067
1068         return nwrap_main_global->libc->fns->_libc_getpwent_r(pwdst,
1069                                                               buf,
1070                                                               buflen);
1071 }
1072 #else /* HAVE_SOLARIS_GETPWENT_R */
1073 static int libc_getpwent_r(struct passwd *pwdst,
1074                            char *buf,
1075                            size_t buflen,
1076                            struct passwd **pwdstp)
1077 {
1078         nwrap_load_lib_function(NWRAP_LIBC, getpwent_r);
1079
1080         return nwrap_main_global->libc->fns->_libc_getpwent_r(pwdst,
1081                                                               buf,
1082                                                               buflen,
1083                                                               pwdstp);
1084 }
1085 #endif /* HAVE_SOLARIS_GETPWENT_R */
1086
1087 static void libc_endpwent(void)
1088 {
1089         nwrap_load_lib_function(NWRAP_LIBC, endpwent);
1090
1091         nwrap_main_global->libc->fns->_libc_endpwent();
1092 }
1093
1094 static int libc_initgroups(const char *user, gid_t gid)
1095 {
1096         nwrap_load_lib_function(NWRAP_LIBC, initgroups);
1097
1098         return nwrap_main_global->libc->fns->_libc_initgroups(user, gid);
1099 }
1100
1101 static struct group *libc_getgrnam(const char *name)
1102 {
1103         nwrap_load_lib_function(NWRAP_LIBC, getgrnam);
1104
1105         return nwrap_main_global->libc->fns->_libc_getgrnam(name);
1106 }
1107
1108 #ifdef HAVE_GETGRNAM_R
1109 static int libc_getgrnam_r(const char *name,
1110                            struct group *grp,
1111                            char *buf,
1112                            size_t buflen,
1113                            struct group **result)
1114 {
1115 #ifdef HAVE___POSIX_GETGRNAM_R
1116         if (nwrap_main_global->libc->fns->_libc_getgrnam_r == NULL) {
1117                 *(void **) (&nwrap_main_global->libc->fns->_libc_getgrnam_r) =
1118                         _nwrap_load_lib_function(NWRAP_LIBC, "__posix_getgrnam_r");
1119         }
1120 #else
1121         nwrap_load_lib_function(NWRAP_LIBC, getgrnam_r);
1122 #endif
1123
1124         return nwrap_main_global->libc->fns->_libc_getgrnam_r(name,
1125                                                               grp,
1126                                                               buf,
1127                                                               buflen,
1128                                                               result);
1129 }
1130 #endif
1131
1132 static struct group *libc_getgrgid(gid_t gid)
1133 {
1134         nwrap_load_lib_function(NWRAP_LIBC, getgrgid);
1135
1136         return nwrap_main_global->libc->fns->_libc_getgrgid(gid);
1137 }
1138
1139 #ifdef HAVE_GETGRGID_R
1140 static int libc_getgrgid_r(gid_t gid,
1141                            struct group *grp,
1142                            char *buf,
1143                            size_t buflen,
1144                            struct group **result)
1145 {
1146 #ifdef HAVE___POSIX_GETGRGID_R
1147         if (nwrap_main_global->libc->fns->_libc_getgrgid_r == NULL) {
1148                 *(void **) (&nwrap_main_global->libc->fns->_libc_getgrgid_r) =
1149                         _nwrap_load_lib_function(NWRAP_LIBC, "__posix_getgrgid_r");
1150         }
1151 #else
1152         nwrap_load_lib_function(NWRAP_LIBC, getgrgid_r);
1153 #endif
1154
1155         return nwrap_main_global->libc->fns->_libc_getgrgid_r(gid,
1156                                                               grp,
1157                                                               buf,
1158                                                               buflen,
1159                                                               result);
1160 }
1161 #endif
1162
1163 static void libc_setgrent(void)
1164 {
1165         nwrap_load_lib_function(NWRAP_LIBC, setgrent);
1166
1167         nwrap_main_global->libc->fns->_libc_setgrent();
1168 }
1169
1170 static struct group *libc_getgrent(void)
1171 {
1172         nwrap_load_lib_function(NWRAP_LIBC, getgrent);
1173
1174         return nwrap_main_global->libc->fns->_libc_getgrent();
1175 }
1176
1177 #ifdef HAVE_GETGRENT_R
1178 #ifdef HAVE_SOLARIS_GETGRENT_R
1179 static struct group *libc_getgrent_r(struct group *group,
1180                                      char *buf,
1181                                      size_t buflen)
1182 {
1183         nwrap_load_lib_function(NWRAP_LIBC, getgrent_r);
1184
1185         return nwrap_main_global->libc->fns->_libc_getgrent_r(group,
1186                                                               buf,
1187                                                               buflen);
1188 }
1189 #else /* !HAVE_SOLARIS_GETGRENT_R */
1190 static int libc_getgrent_r(struct group *group,
1191                            char *buf,
1192                            size_t buflen,
1193                            struct group **result)
1194 {
1195         nwrap_load_lib_function(NWRAP_LIBC, getgrent_r);
1196
1197         return nwrap_main_global->libc->fns->_libc_getgrent_r(group,
1198                                                               buf,
1199                                                               buflen,
1200                                                               result);
1201 }
1202 #endif /* HAVE_SOLARIS_GETGRENT_R */
1203 #endif /* HAVE_GETGRENT_R */
1204
1205 static void libc_endgrent(void)
1206 {
1207         nwrap_load_lib_function(NWRAP_LIBC, endgrent);
1208
1209         nwrap_main_global->libc->fns->_libc_endgrent();
1210 }
1211
1212 #ifdef HAVE_GETGROUPLIST
1213 static int libc_getgrouplist(const char *user,
1214                              gid_t group,
1215                              gid_t *groups,
1216                              int *ngroups)
1217 {
1218         nwrap_load_lib_function(NWRAP_LIBC, getgrouplist);
1219
1220         return nwrap_main_global->libc->fns->_libc_getgrouplist(user,
1221                                                                 group,
1222                                                                 groups,
1223                                                                 ngroups);
1224 }
1225 #endif
1226
1227 static void libc_sethostent(int stayopen)
1228 {
1229         nwrap_load_lib_function(NWRAP_LIBNSL, sethostent);
1230
1231         nwrap_main_global->libc->fns->_libc_sethostent(stayopen);
1232 }
1233
1234 static struct hostent *libc_gethostent(void)
1235 {
1236         nwrap_load_lib_function(NWRAP_LIBNSL, gethostent);
1237
1238         return nwrap_main_global->libc->fns->_libc_gethostent();
1239 }
1240
1241 static void libc_endhostent(void)
1242 {
1243         nwrap_load_lib_function(NWRAP_LIBNSL, endhostent);
1244
1245         nwrap_main_global->libc->fns->_libc_endhostent();
1246 }
1247
1248 static struct hostent *libc_gethostbyname(const char *name)
1249 {
1250         nwrap_load_lib_function(NWRAP_LIBNSL, gethostbyname);
1251
1252         return nwrap_main_global->libc->fns->_libc_gethostbyname(name);
1253 }
1254
1255 #ifdef HAVE_GETHOSTBYNAME2 /* GNU extension */
1256 static struct hostent *libc_gethostbyname2(const char *name, int af)
1257 {
1258         nwrap_load_lib_function(NWRAP_LIBNSL, gethostbyname2);
1259
1260         return nwrap_main_global->libc->fns->_libc_gethostbyname2(name, af);
1261 }
1262 #endif
1263
1264 static struct hostent *libc_gethostbyaddr(const void *addr,
1265                                           socklen_t len,
1266                                           int type)
1267 {
1268         nwrap_load_lib_function(NWRAP_LIBNSL, gethostbyaddr);
1269
1270         return nwrap_main_global->libc->fns->_libc_gethostbyaddr(addr,
1271                                                                  len,
1272                                                                  type);
1273 }
1274
1275 static int libc_gethostname(char *name, size_t len)
1276 {
1277         nwrap_load_lib_function(NWRAP_LIBNSL, gethostname);
1278
1279         return nwrap_main_global->libc->fns->_libc_gethostname(name, len);
1280 }
1281
1282 #ifdef HAVE_GETHOSTBYNAME_R
1283 static int libc_gethostbyname_r(const char *name,
1284                                 struct hostent *ret,
1285                                 char *buf,
1286                                 size_t buflen,
1287                                 struct hostent **result,
1288                                 int *h_errnop)
1289 {
1290         nwrap_load_lib_function(NWRAP_LIBNSL, gethostbyname_r);
1291
1292         return nwrap_main_global->libc->fns->_libc_gethostbyname_r(name,
1293                                                                    ret,
1294                                                                    buf,
1295                                                                    buflen,
1296                                                                    result,
1297                                                                    h_errnop);
1298 }
1299 #endif
1300
1301 #ifdef HAVE_GETHOSTBYADDR_R
1302 static int libc_gethostbyaddr_r(const void *addr,
1303                                 socklen_t len,
1304                                 int type,
1305                                 struct hostent *ret,
1306                                 char *buf,
1307                                 size_t buflen,
1308                                 struct hostent **result,
1309                                 int *h_errnop)
1310 {
1311         nwrap_load_lib_function(NWRAP_LIBNSL, gethostbyaddr_r);
1312
1313         return nwrap_main_global->libc->fns->_libc_gethostbyaddr_r(addr,
1314                                                                    len,
1315                                                                    type,
1316                                                                    ret,
1317                                                                    buf,
1318                                                                    buflen,
1319                                                                    result,
1320                                                                    h_errnop);
1321 }
1322 #endif
1323
1324 static int libc_getaddrinfo(const char *node,
1325                             const char *service,
1326                             const struct addrinfo *hints,
1327                             struct addrinfo **res)
1328 {
1329         nwrap_load_lib_function(NWRAP_LIBSOCKET, getaddrinfo);
1330
1331         return nwrap_main_global->libc->fns->_libc_getaddrinfo(node,
1332                                                                service,
1333                                                                hints,
1334                                                                res);
1335 }
1336
1337 static int libc_getnameinfo(const struct sockaddr *sa,
1338                             socklen_t salen,
1339                             char *host,
1340                             size_t hostlen,
1341                             char *serv,
1342                             size_t servlen,
1343                             int flags)
1344 {
1345         nwrap_load_lib_function(NWRAP_LIBSOCKET, getnameinfo);
1346
1347         return nwrap_main_global->libc->fns->_libc_getnameinfo(sa,
1348                                                                salen,
1349                                                                host,
1350                                                                hostlen,
1351                                                                serv,
1352                                                                servlen,
1353                                                                flags);
1354 }
1355
1356 /*********************************************************
1357  * NWRAP NSS MODULE LOADER FUNCTIONS
1358  *********************************************************/
1359
1360 static void *nwrap_load_module_fn(struct nwrap_backend *b,
1361                                   const char *fn_name)
1362 {
1363         void *res;
1364         char *s;
1365
1366         if (!b->so_handle) {
1367                 NWRAP_LOG(NWRAP_LOG_ERROR, "No handle");
1368                 return NULL;
1369         }
1370
1371         if (asprintf(&s, "_nss_%s_%s", b->name, fn_name) == -1) {
1372                 NWRAP_LOG(NWRAP_LOG_ERROR, "Out of memory");
1373                 return NULL;
1374         }
1375
1376         res = dlsym(b->so_handle, s);
1377         if (!res) {
1378                 NWRAP_LOG(NWRAP_LOG_ERROR,
1379                           "Cannot find function %s in %s",
1380                           s, b->so_path);
1381         }
1382         SAFE_FREE(s);
1383         return res;
1384 }
1385
1386 static struct nwrap_module_nss_fns *nwrap_load_module_fns(struct nwrap_backend *b)
1387 {
1388         struct nwrap_module_nss_fns *fns;
1389
1390         if (!b->so_handle) {
1391                 return NULL;
1392         }
1393
1394         fns = (struct nwrap_module_nss_fns *)malloc(sizeof(struct nwrap_module_nss_fns));
1395         if (!fns) {
1396                 return NULL;
1397         }
1398
1399         *(void **)(&fns->_nss_getpwnam_r) =
1400                 nwrap_load_module_fn(b, "getpwnam_r");
1401         *(void **)(&fns->_nss_getpwuid_r) =
1402                 nwrap_load_module_fn(b, "getpwuid_r");
1403         *(void **)(&fns->_nss_setpwent) =
1404                 nwrap_load_module_fn(b, "setpwent");
1405         *(void **)(&fns->_nss_getpwent_r) =
1406                 nwrap_load_module_fn(b, "getpwent_r");
1407         *(void **)(&fns->_nss_endpwent) =
1408                 nwrap_load_module_fn(b, "endpwent");
1409         *(void **)(&fns->_nss_initgroups) =
1410                 nwrap_load_module_fn(b, "initgroups_dyn");
1411         *(void **)(&fns->_nss_getgrnam_r) =
1412                 nwrap_load_module_fn(b, "getgrnam_r");
1413         *(void **)(&fns->_nss_getgrgid_r)=
1414                 nwrap_load_module_fn(b, "getgrgid_r");
1415         *(void **)(&fns->_nss_setgrent) =
1416                 nwrap_load_module_fn(b, "setgrent");
1417         *(void **)(&fns->_nss_getgrent_r) =
1418                 nwrap_load_module_fn(b, "getgrent_r");
1419         *(void **)(&fns->_nss_endgrent) =
1420                 nwrap_load_module_fn(b, "endgrent");
1421
1422         return fns;
1423 }
1424
1425 static void *nwrap_load_module(const char *so_path)
1426 {
1427         void *h;
1428
1429         if (!so_path || !strlen(so_path)) {
1430                 return NULL;
1431         }
1432
1433         h = dlopen(so_path, RTLD_LAZY);
1434         if (!h) {
1435                 NWRAP_LOG(NWRAP_LOG_ERROR,
1436                           "Cannot open shared library %s",
1437                           so_path);
1438                 return NULL;
1439         }
1440
1441         return h;
1442 }
1443
1444 static bool nwrap_module_init(const char *name,
1445                               struct nwrap_ops *ops,
1446                               const char *so_path,
1447                               int *num_backends,
1448                               struct nwrap_backend **backends)
1449 {
1450         struct nwrap_backend *b;
1451
1452         *backends = (struct nwrap_backend *)realloc(*backends,
1453                 sizeof(struct nwrap_backend) * ((*num_backends) + 1));
1454         if (!*backends) {
1455                 NWRAP_LOG(NWRAP_LOG_ERROR, "Out of memory");
1456                 return false;
1457         }
1458
1459         b = &((*backends)[*num_backends]);
1460
1461         b->name = name;
1462         b->ops = ops;
1463         b->so_path = so_path;
1464
1465         if (so_path != NULL) {
1466                 b->so_handle = nwrap_load_module(so_path);
1467                 b->fns = nwrap_load_module_fns(b);
1468                 if (b->fns == NULL) {
1469                         return false;
1470                 }
1471         } else {
1472                 b->so_handle = NULL;
1473                 b->fns = NULL;
1474         }
1475
1476         (*num_backends)++;
1477
1478         return true;
1479 }
1480
1481 static void nwrap_libc_init(struct nwrap_main *r)
1482 {
1483         r->libc = malloc(sizeof(struct nwrap_libc));
1484         if (r->libc == NULL) {
1485                 printf("Failed to allocate memory for libc");
1486                 exit(-1);
1487         }
1488         ZERO_STRUCTP(r->libc);
1489
1490         r->libc->fns = malloc(sizeof(struct nwrap_libc_fns));
1491         if (r->libc->fns == NULL) {
1492                 printf("Failed to allocate memory for libc functions");
1493                 exit(-1);
1494         }
1495         ZERO_STRUCTP(r->libc->fns);
1496 }
1497
1498 static void nwrap_backend_init(struct nwrap_main *r)
1499 {
1500         const char *module_so_path = getenv("NSS_WRAPPER_MODULE_SO_PATH");
1501         const char *module_fn_name = getenv("NSS_WRAPPER_MODULE_FN_PREFIX");
1502
1503         r->num_backends = 0;
1504         r->backends = NULL;
1505
1506         if (!nwrap_module_init("files", &nwrap_files_ops, NULL,
1507                                &r->num_backends,
1508                                &r->backends)) {
1509                 NWRAP_LOG(NWRAP_LOG_ERROR,
1510                           "Failed to initialize 'files' backend");
1511                 return;
1512         }
1513
1514         if (module_so_path != NULL &&
1515             module_so_path[0] != '\0' &&
1516             module_fn_name != NULL &&
1517             module_fn_name[0] != '\0') {
1518                 if (!nwrap_module_init(module_fn_name,
1519                                        &nwrap_module_ops,
1520                                        module_so_path,
1521                                        &r->num_backends,
1522                                        &r->backends)) {
1523                         NWRAP_LOG(NWRAP_LOG_ERROR,
1524                                   "Failed to initialize '%s' backend",
1525                                   module_fn_name);
1526                         return;
1527                 }
1528         }
1529 }
1530
1531 static void nwrap_init(void)
1532 {
1533         const char *env;
1534         char *endptr;
1535         size_t max_hostents_tmp;
1536
1537         NWRAP_LOCK(nwrap_initialized);
1538         if (nwrap_initialized) {
1539                 NWRAP_UNLOCK(nwrap_initialized);
1540                 return;
1541         }
1542
1543         /*
1544          * Still holding nwrap_initialized lock here.
1545          * We don't use NWRAP_(UN)LOCK_ALL macros here because we
1546          * want to avoid overhead when other threads do their job.
1547          */
1548         NWRAP_LOCK(nwrap_global);
1549         NWRAP_LOCK(nwrap_gr_global);
1550         NWRAP_LOCK(nwrap_he_global);
1551         NWRAP_LOCK(nwrap_pw_global);
1552         NWRAP_LOCK(nwrap_sp_global);
1553
1554         nwrap_initialized = true;
1555
1556         /* Initialize pthread_atfork handlers */
1557         pthread_atfork(&nwrap_thread_prepare, &nwrap_thread_parent,
1558                        &nwrap_thread_child);
1559
1560         env = getenv("NSS_WRAPPER_MAX_HOSTENTS");
1561         if (env != NULL) {
1562                 max_hostents_tmp = (size_t)strtol(env, &endptr, 10);
1563                 if (((env != '\0') && (endptr == '\0')) ||
1564                     (max_hostents_tmp == 0)) {
1565                         NWRAP_LOG(NWRAP_LOG_DEBUG,
1566                                   "Error parsing NSS_WRAPPER_MAX_HOSTENTS "
1567                                   "value or value is too small. "
1568                                   "Using default value: %lu.",
1569                                   (unsigned long)max_hostents);
1570                 } else {
1571                         max_hostents = max_hostents_tmp;
1572                 }
1573         }
1574         /* Initialize hash table */
1575         NWRAP_LOG(NWRAP_LOG_DEBUG,
1576                   "Initializing hash table of size %lu items.",
1577                   (unsigned long)max_hostents);
1578         if (hcreate(max_hostents) == 0) {
1579                 NWRAP_LOG(NWRAP_LOG_ERROR,
1580                           "Failed to initialize hash table");
1581                 goto done;
1582         }
1583
1584         nwrap_main_global = &__nwrap_main_global;
1585
1586         nwrap_libc_init(nwrap_main_global);
1587
1588         nwrap_backend_init(nwrap_main_global);
1589
1590         /* passwd */
1591         nwrap_pw_global.cache = &__nwrap_cache_pw;
1592
1593         nwrap_pw_global.cache->path = getenv("NSS_WRAPPER_PASSWD");
1594         nwrap_pw_global.cache->fp = NULL;
1595         nwrap_pw_global.cache->fd = -1;
1596         nwrap_pw_global.cache->private_data = &nwrap_pw_global;
1597         nwrap_pw_global.cache->parse_line = nwrap_pw_parse_line;
1598         nwrap_pw_global.cache->unload = nwrap_pw_unload;
1599
1600         /* shadow */
1601 #if defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM)
1602         nwrap_sp_global.cache = &__nwrap_cache_sp;
1603
1604         nwrap_sp_global.cache->path = getenv("NSS_WRAPPER_SHADOW");
1605         nwrap_sp_global.cache->fp = NULL;
1606         nwrap_sp_global.cache->fd = -1;
1607         nwrap_sp_global.cache->private_data = &nwrap_sp_global;
1608         nwrap_sp_global.cache->parse_line = nwrap_sp_parse_line;
1609         nwrap_sp_global.cache->unload = nwrap_sp_unload;
1610 #endif /* defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM) */
1611
1612         /* group */
1613         nwrap_gr_global.cache = &__nwrap_cache_gr;
1614
1615         nwrap_gr_global.cache->path = getenv("NSS_WRAPPER_GROUP");
1616         nwrap_gr_global.cache->fp = NULL;
1617         nwrap_gr_global.cache->fd = -1;
1618         nwrap_gr_global.cache->private_data = &nwrap_gr_global;
1619         nwrap_gr_global.cache->parse_line = nwrap_gr_parse_line;
1620         nwrap_gr_global.cache->unload = nwrap_gr_unload;
1621
1622         /* hosts */
1623         nwrap_he_global.cache = &__nwrap_cache_he;
1624
1625         nwrap_he_global.cache->path = getenv("NSS_WRAPPER_HOSTS");
1626         nwrap_he_global.cache->fp = NULL;
1627         nwrap_he_global.cache->fd = -1;
1628         nwrap_he_global.cache->private_data = &nwrap_he_global;
1629         nwrap_he_global.cache->parse_line = nwrap_he_parse_line;
1630         nwrap_he_global.cache->unload = nwrap_he_unload;
1631
1632 done:
1633         /* We hold all locks here so we can use NWRAP_UNLOCK_ALL. */
1634         NWRAP_UNLOCK_ALL;
1635 }
1636
1637 bool nss_wrapper_enabled(void)
1638 {
1639         nwrap_init();
1640
1641         if (nwrap_pw_global.cache->path == NULL ||
1642             nwrap_pw_global.cache->path[0] == '\0') {
1643                 return false;
1644         }
1645         if (nwrap_gr_global.cache->path == NULL ||
1646             nwrap_gr_global.cache->path[0] == '\0') {
1647                 return false;
1648         }
1649
1650         return true;
1651 }
1652
1653 #if defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM)
1654 bool nss_wrapper_shadow_enabled(void)
1655 {
1656         nwrap_init();
1657
1658         if (nwrap_sp_global.cache->path == NULL ||
1659             nwrap_sp_global.cache->path[0] == '\0') {
1660                 return false;
1661         }
1662
1663         return true;
1664 }
1665 #endif /* defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM) */
1666
1667 bool nss_wrapper_hosts_enabled(void)
1668 {
1669         nwrap_init();
1670
1671         if (nwrap_he_global.cache->path == NULL ||
1672             nwrap_he_global.cache->path[0] == '\0') {
1673                 return false;
1674         }
1675
1676         return true;
1677 }
1678
1679 static bool nwrap_hostname_enabled(void)
1680 {
1681         nwrap_init();
1682
1683         if (getenv("NSS_WRAPPER_HOSTNAME") == NULL) {
1684                 return false;
1685         }
1686
1687         return true;
1688 }
1689
1690 static bool nwrap_parse_file(struct nwrap_cache *nwrap)
1691 {
1692         char *line = NULL;
1693         ssize_t n;
1694         /* Unused but getline needs it */
1695         size_t len;
1696         bool ok;
1697
1698         if (nwrap->st.st_size == 0) {
1699                 NWRAP_LOG(NWRAP_LOG_DEBUG, "size == 0");
1700                 return true;
1701         }
1702
1703         /* Support for 32-bit system I guess */
1704         if (nwrap->st.st_size > INT32_MAX) {
1705                 NWRAP_LOG(NWRAP_LOG_ERROR,
1706                           "Size[%u] larger than INT32_MAX",
1707                           (unsigned)nwrap->st.st_size);
1708                 return false;
1709         }
1710
1711         rewind(nwrap->fp);
1712
1713         do {
1714                 n = getline(&line, &len, nwrap->fp);
1715                 if (n < 0) {
1716                         SAFE_FREE(line);
1717                         if (feof(nwrap->fp)) {
1718                                 break;
1719                         }
1720
1721                         NWRAP_LOG(NWRAP_LOG_ERROR,
1722                                   "Unable to read line from file: %s",
1723                                   nwrap->path);
1724                         return false;
1725                 }
1726
1727                 if (line[n - 1] == '\n') {
1728                         line[n - 1] = '\0';
1729                 }
1730
1731                 if (line[0] == '\0') {
1732                         SAFE_FREE(line);
1733                         continue;
1734                 }
1735
1736                 ok = nwrap->parse_line(nwrap, line);
1737                 if (!ok) {
1738                         NWRAP_LOG(NWRAP_LOG_ERROR,
1739                                   "Unable to parse line file: %s",
1740                                   line);
1741                         SAFE_FREE(line);
1742                         return false;
1743                 }
1744
1745                 /* Line is parsed without issues so add it to list */
1746                 ok = nwrap_vector_add_item(&(nwrap->lines), (void *const) line);
1747                 if (!ok) {
1748                         NWRAP_LOG(NWRAP_LOG_ERROR,
1749                                   "Unable to add line to vector");
1750                         return false;
1751                 }
1752
1753                 /* This forces getline to allocate new memory for line. */
1754                 line = NULL;
1755         } while (!feof(nwrap->fp));
1756
1757         return true;
1758 }
1759
1760 static void nwrap_files_cache_unload(struct nwrap_cache *nwrap)
1761 {
1762         nwrap->unload(nwrap);
1763
1764         nwrap_lines_unload(nwrap);
1765 }
1766
1767 static bool nwrap_files_cache_reload(struct nwrap_cache *nwrap)
1768 {
1769         struct stat st;
1770         int ret;
1771         bool ok;
1772         bool retried = false;
1773
1774         assert(nwrap != NULL);
1775
1776 reopen:
1777         if (nwrap->fd < 0) {
1778                 nwrap->fp = fopen(nwrap->path, "re");
1779                 if (nwrap->fp == NULL) {
1780                         nwrap->fd = -1;
1781                         NWRAP_LOG(NWRAP_LOG_ERROR,
1782                                   "Unable to open '%s' readonly %d:%s",
1783                                   nwrap->path, nwrap->fd,
1784                                   strerror(errno));
1785                         return false;
1786
1787                 }
1788                 nwrap->fd = fileno(nwrap->fp);
1789                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Open '%s'", nwrap->path);
1790         }
1791
1792         ret = fstat(nwrap->fd, &st);
1793         if (ret != 0) {
1794                 NWRAP_LOG(NWRAP_LOG_ERROR,
1795                           "fstat(%s) - %d:%s",
1796                           nwrap->path,
1797                           ret,
1798                           strerror(errno));
1799                 fclose(nwrap->fp);
1800                 nwrap->fp = NULL;
1801                 nwrap->fd = -1;
1802                 return false;
1803         }
1804
1805         if (retried == false && st.st_nlink == 0) {
1806                 /* maybe someone has replaced the file... */
1807                 NWRAP_LOG(NWRAP_LOG_TRACE,
1808                           "st_nlink == 0, reopen %s",
1809                           nwrap->path);
1810                 retried = true;
1811                 memset(&nwrap->st, 0, sizeof(nwrap->st));
1812                 fclose(nwrap->fp);
1813                 nwrap->fp = NULL;
1814                 nwrap->fd = -1;
1815                 goto reopen;
1816         }
1817
1818         if (st.st_mtime == nwrap->st.st_mtime) {
1819                 NWRAP_LOG(NWRAP_LOG_TRACE,
1820                           "st_mtime[%u] hasn't changed, skip reload",
1821                           (unsigned)st.st_mtime);
1822                 return true;
1823         }
1824
1825         NWRAP_LOG(NWRAP_LOG_TRACE,
1826                   "st_mtime has changed [%u] => [%u], start reload",
1827                   (unsigned)st.st_mtime,
1828                   (unsigned)nwrap->st.st_mtime);
1829
1830         nwrap->st = st;
1831
1832         nwrap_files_cache_unload(nwrap);
1833
1834         ok = nwrap_parse_file(nwrap);
1835         if (!ok) {
1836                 NWRAP_LOG(NWRAP_LOG_ERROR, "Failed to reload %s", nwrap->path);
1837                 nwrap_files_cache_unload(nwrap);
1838                 return false;
1839         }
1840
1841         NWRAP_LOG(NWRAP_LOG_TRACE, "Reloaded %s", nwrap->path);
1842         return true;
1843 }
1844
1845 /*
1846  * the caller has to call nwrap_unload() on failure
1847  */
1848 static bool nwrap_pw_parse_line(struct nwrap_cache *nwrap, char *line)
1849 {
1850         struct nwrap_pw *nwrap_pw;
1851         char *c;
1852         char *p;
1853         char *e;
1854         struct passwd *pw;
1855         size_t list_size;
1856
1857         nwrap_pw = (struct nwrap_pw *)nwrap->private_data;
1858
1859         list_size = sizeof(*nwrap_pw->list) * (nwrap_pw->num+1);
1860         pw = (struct passwd *)realloc(nwrap_pw->list, list_size);
1861         if (!pw) {
1862                 NWRAP_LOG(NWRAP_LOG_ERROR,
1863                           "realloc(%u) failed",
1864                           (unsigned)list_size);
1865                 return false;
1866         }
1867         nwrap_pw->list = pw;
1868
1869         pw = &nwrap_pw->list[nwrap_pw->num];
1870
1871         c = line;
1872
1873         /* name */
1874         p = strchr(c, ':');
1875         if (!p) {
1876                 NWRAP_LOG(NWRAP_LOG_ERROR,
1877                           "Invalid line[%s]: '%s'",
1878                           line,
1879                           c);
1880                 return false;
1881         }
1882         *p = '\0';
1883         p++;
1884         pw->pw_name = c;
1885         c = p;
1886
1887         NWRAP_LOG(NWRAP_LOG_TRACE, "name[%s]\n", pw->pw_name);
1888
1889         /* password */
1890         p = strchr(c, ':');
1891         if (!p) {
1892                 NWRAP_LOG(NWRAP_LOG_ERROR, "Invalid line[%s]: '%s'", line, c);
1893                 return false;
1894         }
1895         *p = '\0';
1896         p++;
1897         pw->pw_passwd = c;
1898         c = p;
1899
1900         NWRAP_LOG(NWRAP_LOG_TRACE, "password[%s]\n", pw->pw_passwd);
1901
1902         /* uid */
1903         p = strchr(c, ':');
1904         if (!p) {
1905                 NWRAP_LOG(NWRAP_LOG_ERROR, "Invalid line[%s]: '%s'", line, c);
1906                 return false;
1907         }
1908         *p = '\0';
1909         p++;
1910         e = NULL;
1911         pw->pw_uid = (uid_t)strtoul(c, &e, 10);
1912         if (c == e) {
1913                 NWRAP_LOG(NWRAP_LOG_ERROR,
1914                           "Invalid line[%s]: '%s' - %s",
1915                           line, c, strerror(errno));
1916                 return false;
1917         }
1918         if (e == NULL) {
1919                 NWRAP_LOG(NWRAP_LOG_ERROR,
1920                           "Invalid line[%s]: '%s' - %s",
1921                           line, c, strerror(errno));
1922                 return false;
1923         }
1924         if (e[0] != '\0') {
1925                 NWRAP_LOG(NWRAP_LOG_ERROR,
1926                           "Invalid line[%s]: '%s' - %s",
1927                           line, c, strerror(errno));
1928                 return false;
1929         }
1930         c = p;
1931
1932         NWRAP_LOG(NWRAP_LOG_TRACE, "uid[%u]", pw->pw_uid);
1933
1934         /* gid */
1935         p = strchr(c, ':');
1936         if (!p) {
1937                 NWRAP_LOG(NWRAP_LOG_ERROR, "Invalid line[%s]: '%s'", line, c);
1938                 return false;
1939         }
1940         *p = '\0';
1941         p++;
1942         e = NULL;
1943         pw->pw_gid = (gid_t)strtoul(c, &e, 10);
1944         if (c == e) {
1945                 NWRAP_LOG(NWRAP_LOG_ERROR,
1946                           "Invalid line[%s]: '%s' - %s",
1947                           line, c, strerror(errno));
1948                 return false;
1949         }
1950         if (e == NULL) {
1951                 NWRAP_LOG(NWRAP_LOG_ERROR,
1952                           "Invalid line[%s]: '%s' - %s",
1953                           line, c, strerror(errno));
1954                 return false;
1955         }
1956         if (e[0] != '\0') {
1957                 NWRAP_LOG(NWRAP_LOG_ERROR,
1958                           "Invalid line[%s]: '%s' - %s",
1959                           line, c, strerror(errno));
1960                 return false;
1961         }
1962         c = p;
1963
1964         NWRAP_LOG(NWRAP_LOG_TRACE, "gid[%u]\n", pw->pw_gid);
1965
1966         /* gecos */
1967         p = strchr(c, ':');
1968         if (!p) {
1969                 NWRAP_LOG(NWRAP_LOG_ERROR, "invalid line[%s]: '%s'", line, c);
1970                 return false;
1971         }
1972         *p = '\0';
1973         p++;
1974         pw->pw_gecos = c;
1975         c = p;
1976
1977         NWRAP_LOG(NWRAP_LOG_TRACE, "gecos[%s]", pw->pw_gecos);
1978
1979         /* dir */
1980         p = strchr(c, ':');
1981         if (!p) {
1982                 NWRAP_LOG(NWRAP_LOG_ERROR, "'%s'", c);
1983                 return false;
1984         }
1985         *p = '\0';
1986         p++;
1987         pw->pw_dir = c;
1988         c = p;
1989
1990         NWRAP_LOG(NWRAP_LOG_TRACE, "dir[%s]", pw->pw_dir);
1991
1992         /* shell */
1993         pw->pw_shell = c;
1994         NWRAP_LOG(NWRAP_LOG_TRACE, "shell[%s]", pw->pw_shell);
1995
1996         NWRAP_LOG(NWRAP_LOG_DEBUG,
1997                   "Added user[%s:%s:%u:%u:%s:%s:%s]",
1998                   pw->pw_name, pw->pw_passwd,
1999                   pw->pw_uid, pw->pw_gid,
2000                   pw->pw_gecos, pw->pw_dir, pw->pw_shell);
2001
2002         nwrap_pw->num++;
2003         return true;
2004 }
2005
2006 static void nwrap_pw_unload(struct nwrap_cache *nwrap)
2007 {
2008         struct nwrap_pw *nwrap_pw;
2009         nwrap_pw = (struct nwrap_pw *)nwrap->private_data;
2010
2011         SAFE_FREE(nwrap_pw->list);
2012         nwrap_pw->num = 0;
2013         nwrap_pw->idx = 0;
2014 }
2015
2016 static int nwrap_pw_copy_r(const struct passwd *src, struct passwd *dst,
2017                            char *buf, size_t buflen, struct passwd **dstp)
2018 {
2019         char *first;
2020         char *last;
2021         off_t ofs;
2022
2023         first = src->pw_name;
2024
2025         last = src->pw_shell;
2026         while (*last) last++;
2027
2028         ofs = PTR_DIFF(last + 1, first);
2029
2030         if (ofs > (off_t) buflen) {
2031                 return ERANGE;
2032         }
2033
2034         memcpy(buf, first, ofs);
2035
2036         ofs = PTR_DIFF(src->pw_name, first);
2037         dst->pw_name = buf + ofs;
2038         ofs = PTR_DIFF(src->pw_passwd, first);
2039         dst->pw_passwd = buf + ofs;
2040         dst->pw_uid = src->pw_uid;
2041         dst->pw_gid = src->pw_gid;
2042         ofs = PTR_DIFF(src->pw_gecos, first);
2043         dst->pw_gecos = buf + ofs;
2044         ofs = PTR_DIFF(src->pw_dir, first);
2045         dst->pw_dir = buf + ofs;
2046         ofs = PTR_DIFF(src->pw_shell, first);
2047         dst->pw_shell = buf + ofs;
2048
2049         if (dstp) {
2050                 *dstp = dst;
2051         }
2052
2053         return 0;
2054 }
2055
2056 #if defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM)
2057 static bool nwrap_sp_parse_line(struct nwrap_cache *nwrap, char *line)
2058 {
2059         struct nwrap_sp *nwrap_sp;
2060         struct spwd *sp;
2061         size_t list_size;
2062         char *c;
2063         char *e;
2064         char *p;
2065
2066         nwrap_sp = (struct nwrap_sp *)nwrap->private_data;
2067
2068         list_size = sizeof(*nwrap_sp->list) * (nwrap_sp->num+1);
2069         sp = (struct spwd *)realloc(nwrap_sp->list, list_size);
2070         if (sp == NULL) {
2071                 NWRAP_LOG(NWRAP_LOG_ERROR,
2072                           "realloc(%u) failed",
2073                           (unsigned)list_size);
2074                 return false;
2075         }
2076         nwrap_sp->list = sp;
2077
2078         sp = &nwrap_sp->list[nwrap_sp->num];
2079
2080         c = line;
2081
2082         /* name */
2083         p = strchr(c, ':');
2084         if (p == NULL) {
2085                 NWRAP_LOG(NWRAP_LOG_ERROR,
2086                           "name -- Invalid line[%s]: '%s'",
2087                           line,
2088                           c);
2089                 return false;
2090         }
2091         *p = '\0';
2092         p++;
2093         sp->sp_namp = c;
2094         c = p;
2095
2096         NWRAP_LOG(NWRAP_LOG_TRACE, "name[%s]\n", sp->sp_namp);
2097
2098         /* pwd */
2099         p = strchr(c, ':');
2100         if (p == NULL) {
2101                 NWRAP_LOG(NWRAP_LOG_ERROR,
2102                           "pwd -- Invalid line[%s]: '%s'",
2103                           line,
2104                           c);
2105                 return false;
2106         }
2107         *p = '\0';
2108         p++;
2109         sp->sp_pwdp = c;
2110         c = p;
2111
2112         /* lstchg (long) */
2113         if (c[0] == ':') {
2114                 sp->sp_lstchg = -1;
2115                 p++;
2116         } else {
2117                 p = strchr(c, ':');
2118                 if (p == NULL) {
2119                         NWRAP_LOG(NWRAP_LOG_ERROR,
2120                                   "lstchg -- Invalid line[%s]: '%s'",
2121                                   line,
2122                                   c);
2123                         return false;
2124                 }
2125                 *p = '\0';
2126                 p++;
2127                 sp->sp_lstchg = strtol(c, &e, 10);
2128                 if (c == e) {
2129                         NWRAP_LOG(NWRAP_LOG_ERROR,
2130                                   "lstchg -- Invalid line[%s]: '%s' - %s",
2131                                   line, c, strerror(errno));
2132                         return false;
2133                 }
2134                 if (e == NULL) {
2135                         NWRAP_LOG(NWRAP_LOG_ERROR,
2136                                   "lstchg -- Invalid line[%s]: '%s' - %s",
2137                                   line, c, strerror(errno));
2138                         return false;
2139                 }
2140                 if (e[0] != '\0') {
2141                         NWRAP_LOG(NWRAP_LOG_ERROR,
2142                                   "lstchg -- Invalid line[%s]: '%s' - %s",
2143                                   line, c, strerror(errno));
2144                         return false;
2145                 }
2146         }
2147         c = p;
2148
2149         /* min (long) */
2150         if (c[0] == ':') {
2151                 sp->sp_min = -1;
2152                 p++;
2153         } else {
2154                 p = strchr(c, ':');
2155                 if (p == NULL) {
2156                         NWRAP_LOG(NWRAP_LOG_ERROR,
2157                                   "min -- Invalid line[%s]: '%s'",
2158                                   line,
2159                                   c);
2160                         return false;
2161                 }
2162                 *p = '\0';
2163                 p++;
2164                 sp->sp_min = strtol(c, &e, 10);
2165                 if (c == e) {
2166                         NWRAP_LOG(NWRAP_LOG_ERROR,
2167                                   "min -- Invalid line[%s]: '%s' - %s",
2168                                   line, c, strerror(errno));
2169                         return false;
2170                 }
2171                 if (e == NULL) {
2172                         NWRAP_LOG(NWRAP_LOG_ERROR,
2173                                   "min -- Invalid line[%s]: '%s' - %s",
2174                                   line, c, strerror(errno));
2175                         return false;
2176                 }
2177                 if (e[0] != '\0') {
2178                         NWRAP_LOG(NWRAP_LOG_ERROR,
2179                                   "min -- Invalid line[%s]: '%s' - %s",
2180                                   line, c, strerror(errno));
2181                         return false;
2182                 }
2183         }
2184         c = p;
2185
2186         /* max (long) */
2187         if (c[0] == ':') {
2188                 sp->sp_max = -1;
2189                 p++;
2190         } else {
2191                 p = strchr(c, ':');
2192                 if (p == NULL) {
2193                         NWRAP_LOG(NWRAP_LOG_ERROR,
2194                                   "max -- Invalid line[%s]: '%s'",
2195                                   line,
2196                                   c);
2197                         return false;
2198                 }
2199                 *p = '\0';
2200                 p++;
2201                 sp->sp_max = strtol(c, &e, 10);
2202                 if (c == e) {
2203                         NWRAP_LOG(NWRAP_LOG_ERROR,
2204                                   "max -- Invalid line[%s]: '%s' - %s",
2205                                   line, c, strerror(errno));
2206                         return false;
2207                 }
2208                 if (e == NULL) {
2209                         NWRAP_LOG(NWRAP_LOG_ERROR,
2210                                   "max -- Invalid line[%s]: '%s' - %s",
2211                                   line, c, strerror(errno));
2212                         return false;
2213                 }
2214                 if (e[0] != '\0') {
2215                         NWRAP_LOG(NWRAP_LOG_ERROR,
2216                                   "max -- Invalid line[%s]: '%s' - %s",
2217                                   line, c, strerror(errno));
2218                         return false;
2219                 }
2220         }
2221         c = p;
2222
2223         /* warn (long) */
2224         if (c[0] == ':') {
2225                 sp->sp_warn = -1;
2226                 p++;
2227         } else {
2228                 p = strchr(c, ':');
2229                 if (p == NULL) {
2230                         NWRAP_LOG(NWRAP_LOG_ERROR,
2231                                   "warn -- Invalid line[%s]: '%s'",
2232                                   line,
2233                                   c);
2234                         return false;
2235                 }
2236                 *p = '\0';
2237                 p++;
2238                 sp->sp_warn = strtol(c, &e, 10);
2239                 if (c == e) {
2240                         NWRAP_LOG(NWRAP_LOG_ERROR,
2241                                   "warn -- Invalid line[%s]: '%s' - %s",
2242                                   line, c, strerror(errno));
2243                         return false;
2244                 }
2245                 if (e == NULL) {
2246                         NWRAP_LOG(NWRAP_LOG_ERROR,
2247                                   "warn -- Invalid line[%s]: '%s' - %s",
2248                                   line, c, strerror(errno));
2249                         return false;
2250                 }
2251                 if (e[0] != '\0') {
2252                         NWRAP_LOG(NWRAP_LOG_ERROR,
2253                                   "warn -- Invalid line[%s]: '%s' - %s",
2254                                   line, c, strerror(errno));
2255                         return false;
2256                 }
2257         }
2258         c = p;
2259
2260         /* inact (long) */
2261         if (c[0] == ':') {
2262                 sp->sp_inact = -1;
2263                 p++;
2264         } else {
2265                 p = strchr(c, ':');
2266                 if (p == NULL) {
2267                         NWRAP_LOG(NWRAP_LOG_ERROR,
2268                                   "inact -- Invalid line[%s]: '%s'",
2269                                   line,
2270                                   c);
2271                         return false;
2272                 }
2273                 *p = '\0';
2274                 p++;
2275                 sp->sp_inact = strtol(c, &e, 10);
2276                 if (c == e) {
2277                         NWRAP_LOG(NWRAP_LOG_ERROR,
2278                                   "inact -- Invalid line[%s]: '%s' - %s",
2279                                   line, c, strerror(errno));
2280                         return false;
2281                 }
2282                 if (e == NULL) {
2283                         NWRAP_LOG(NWRAP_LOG_ERROR,
2284                                   "inact -- Invalid line[%s]: '%s' - %s",
2285                                   line, c, strerror(errno));
2286                         return false;
2287                 }
2288                 if (e[0] != '\0') {
2289                         NWRAP_LOG(NWRAP_LOG_ERROR,
2290                                   "inact -- Invalid line[%s]: '%s' - %s",
2291                                   line, c, strerror(errno));
2292                         return false;
2293                 }
2294         }
2295         c = p;
2296
2297         /* expire (long) */
2298         if (c[0] == ':') {
2299                 sp->sp_expire = -1;
2300                 p++;
2301         } else {
2302                 p = strchr(c, ':');
2303                 if (p == NULL) {
2304                         NWRAP_LOG(NWRAP_LOG_ERROR,
2305                                   "expire -- Invalid line[%s]: '%s'",
2306                                   line,
2307                                   c);
2308                         return false;
2309                 }
2310                 *p = '\0';
2311                 p++;
2312                 sp->sp_expire = strtol(c, &e, 10);
2313                 if (c == e) {
2314                         NWRAP_LOG(NWRAP_LOG_ERROR,
2315                                   "expire -- Invalid line[%s]: '%s' - %s",
2316                                   line, c, strerror(errno));
2317                         return false;
2318                 }
2319                 if (e == NULL) {
2320                         NWRAP_LOG(NWRAP_LOG_ERROR,
2321                                   "expire -- Invalid line[%s]: '%s' - %s",
2322                                   line, c, strerror(errno));
2323                         return false;
2324                 }
2325                 if (e[0] != '\0') {
2326                         NWRAP_LOG(NWRAP_LOG_ERROR,
2327                                   "expire -- Invalid line[%s]: '%s' - %s",
2328                                   line, c, strerror(errno));
2329                         return false;
2330                 }
2331         }
2332         c = p;
2333
2334         nwrap_sp->num++;
2335         return true;
2336 }
2337
2338 static void nwrap_sp_unload(struct nwrap_cache *nwrap)
2339 {
2340         struct nwrap_sp *nwrap_sp;
2341         nwrap_sp = (struct nwrap_sp *)nwrap->private_data;
2342
2343         SAFE_FREE(nwrap_sp->list);
2344         nwrap_sp->num = 0;
2345         nwrap_sp->idx = 0;
2346 }
2347 #endif /* defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM) */
2348
2349 /*
2350  * the caller has to call nwrap_unload() on failure
2351  */
2352 static bool nwrap_gr_parse_line(struct nwrap_cache *nwrap, char *line)
2353 {
2354         struct nwrap_gr *nwrap_gr;
2355         char *c;
2356         char *p;
2357         char *e;
2358         struct group *gr;
2359         size_t list_size;
2360         unsigned nummem;
2361
2362         nwrap_gr = (struct nwrap_gr *)nwrap->private_data;
2363
2364         list_size = sizeof(*nwrap_gr->list) * (nwrap_gr->num+1);
2365         gr = (struct group *)realloc(nwrap_gr->list, list_size);
2366         if (!gr) {
2367                 NWRAP_LOG(NWRAP_LOG_ERROR, "realloc failed");
2368                 return false;
2369         }
2370         nwrap_gr->list = gr;
2371
2372         gr = &nwrap_gr->list[nwrap_gr->num];
2373
2374         c = line;
2375
2376         /* name */
2377         p = strchr(c, ':');
2378         if (!p) {
2379                 NWRAP_LOG(NWRAP_LOG_ERROR, "Invalid line[%s]: '%s'", line, c);
2380                 return false;
2381         }
2382         *p = '\0';
2383         p++;
2384         gr->gr_name = c;
2385         c = p;
2386
2387         NWRAP_LOG(NWRAP_LOG_TRACE, "name[%s]", gr->gr_name);
2388
2389         /* password */
2390         p = strchr(c, ':');
2391         if (!p) {
2392                 NWRAP_LOG(NWRAP_LOG_ERROR, "Invalid line[%s]: '%s'", line, c);
2393                 return false;
2394         }
2395         *p = '\0';
2396         p++;
2397         gr->gr_passwd = c;
2398         c = p;
2399
2400         NWRAP_LOG(NWRAP_LOG_TRACE, "password[%s]", gr->gr_passwd);
2401
2402         /* gid */
2403         p = strchr(c, ':');
2404         if (!p) {
2405                 NWRAP_LOG(NWRAP_LOG_ERROR, "Invalid line[%s]: '%s'", line, c);
2406                 return false;
2407         }
2408         *p = '\0';
2409         p++;
2410         e = NULL;
2411         gr->gr_gid = (gid_t)strtoul(c, &e, 10);
2412         if (c == e) {
2413                 NWRAP_LOG(NWRAP_LOG_ERROR,
2414                           "Invalid line[%s]: '%s' - %s",
2415                           line, c, strerror(errno));
2416                 return false;
2417         }
2418         if (e == NULL) {
2419                 NWRAP_LOG(NWRAP_LOG_ERROR,
2420                           "Invalid line[%s]: '%s' - %s",
2421                           line, c, strerror(errno));
2422                 return false;
2423         }
2424         if (e[0] != '\0') {
2425                 NWRAP_LOG(NWRAP_LOG_ERROR,
2426                           "Invalid line[%s]: '%s' - %s",
2427                           line, c, strerror(errno));
2428                 return false;
2429         }
2430         c = p;
2431
2432         NWRAP_LOG(NWRAP_LOG_TRACE, "gid[%u]", gr->gr_gid);
2433
2434         /* members */
2435         gr->gr_mem = (char **)malloc(sizeof(char *));
2436         if (!gr->gr_mem) {
2437                 NWRAP_LOG(NWRAP_LOG_ERROR, "Out of memory");
2438                 return false;
2439         }
2440         gr->gr_mem[0] = NULL;
2441
2442         for(nummem=0; p; nummem++) {
2443                 char **m;
2444                 size_t m_size;
2445                 c = p;
2446                 p = strchr(c, ',');
2447                 if (p) {
2448                         *p = '\0';
2449                         p++;
2450                 }
2451
2452                 if (strlen(c) == 0) {
2453                         break;
2454                 }
2455
2456                 m_size = sizeof(char *) * (nummem+2);
2457                 m = (char **)realloc(gr->gr_mem, m_size);
2458                 if (!m) {
2459                         NWRAP_LOG(NWRAP_LOG_ERROR,
2460                                   "realloc(%zd) failed",
2461                                   m_size);
2462                         return false;
2463                 }
2464                 gr->gr_mem = m;
2465                 gr->gr_mem[nummem] = c;
2466                 gr->gr_mem[nummem+1] = NULL;
2467
2468                 NWRAP_LOG(NWRAP_LOG_TRACE,
2469                           "member[%u]: '%s'",
2470                           nummem, gr->gr_mem[nummem]);
2471         }
2472
2473         NWRAP_LOG(NWRAP_LOG_DEBUG,
2474                   "Added group[%s:%s:%u:] with %u members",
2475                   gr->gr_name, gr->gr_passwd, gr->gr_gid, nummem);
2476
2477         nwrap_gr->num++;
2478         return true;
2479 }
2480
2481 static void nwrap_gr_unload(struct nwrap_cache *nwrap)
2482 {
2483         int i;
2484         struct nwrap_gr *nwrap_gr;
2485         nwrap_gr = (struct nwrap_gr *)nwrap->private_data;
2486
2487         if (nwrap_gr->list) {
2488                 for (i=0; i < nwrap_gr->num; i++) {
2489                         SAFE_FREE(nwrap_gr->list[i].gr_mem);
2490                 }
2491                 SAFE_FREE(nwrap_gr->list);
2492         }
2493
2494         nwrap_gr->num = 0;
2495         nwrap_gr->idx = 0;
2496 }
2497
2498 static int nwrap_gr_copy_r(const struct group *src, struct group *dst,
2499                            char *buf, size_t buflen, struct group **dstp)
2500 {
2501         char *first;
2502         char **lastm;
2503         char *last = NULL;
2504         off_t ofsb;
2505         off_t ofsm;
2506         off_t ofs;
2507         unsigned i;
2508
2509         first = src->gr_name;
2510
2511         lastm = src->gr_mem;
2512         while (*lastm) {
2513                 last = *lastm;
2514                 lastm++;
2515         }
2516
2517         if (last == NULL) {
2518                 last = src->gr_passwd;
2519         }
2520         while (*last) last++;
2521
2522         ofsb = PTR_DIFF(last + 1, first);
2523         ofsm = PTR_DIFF(lastm + 1, src->gr_mem);
2524
2525         if ((ofsb + ofsm) > (off_t) buflen) {
2526                 return ERANGE;
2527         }
2528
2529         memcpy(buf, first, ofsb);
2530         memcpy(buf + ofsb, src->gr_mem, ofsm);
2531
2532         ofs = PTR_DIFF(src->gr_name, first);
2533         dst->gr_name = buf + ofs;
2534         ofs = PTR_DIFF(src->gr_passwd, first);
2535         dst->gr_passwd = buf + ofs;
2536         dst->gr_gid = src->gr_gid;
2537
2538         dst->gr_mem = (char **)(buf + ofsb);
2539         for (i=0; src->gr_mem[i]; i++) {
2540                 ofs = PTR_DIFF(src->gr_mem[i], first);
2541                 dst->gr_mem[i] = buf + ofs;
2542         }
2543
2544         if (dstp) {
2545                 *dstp = dst;
2546         }
2547
2548         return 0;
2549 }
2550
2551 static struct nwrap_entlist *nwrap_entlist_init(struct nwrap_entdata *ed)
2552 {
2553         struct nwrap_entlist *el;
2554
2555         if (ed == NULL) {
2556                 NWRAP_LOG(NWRAP_LOG_ERROR,
2557                           "entry is NULL, can't create list item");
2558                 return NULL;
2559         }
2560
2561         el = (struct nwrap_entlist *)malloc(sizeof(struct nwrap_entlist));
2562         if (el == NULL) {
2563                 NWRAP_LOG(NWRAP_LOG_ERROR, "malloc failed");
2564                 return NULL;
2565         }
2566
2567         el->next = NULL;
2568         el->ed = ed;
2569
2570         return el;
2571 }
2572
2573 static bool nwrap_ed_inventarize_add_new(char *const h_name,
2574                                          struct nwrap_entdata *const ed)
2575 {
2576         ENTRY e;
2577         ENTRY *p;
2578         struct nwrap_entlist *el;
2579         bool ok;
2580
2581         if (h_name == NULL) {
2582                 NWRAP_LOG(NWRAP_LOG_ERROR, "h_name NULL - can't add");
2583                 return false;
2584         }
2585
2586         el = nwrap_entlist_init(ed);
2587         if (el == NULL) {
2588                 return false;
2589         }
2590
2591         e.key = h_name;
2592         e.data = (void *)el;
2593
2594         p = hsearch(e, ENTER);
2595         if (p == NULL) {
2596                 NWRAP_LOG(NWRAP_LOG_ERROR, "Hash table is full!");
2597                 return false;
2598         }
2599
2600         ok = nwrap_vector_add_item(&(nwrap_he_global.lists), (void *)el);
2601         if (!ok) {
2602                 NWRAP_LOG(NWRAP_LOG_ERROR,
2603                           "Failed to add list entry to vector.");
2604                 return false;
2605         }
2606
2607         return true;
2608 }
2609
2610 static bool nwrap_ed_inventarize_add_to_existing(struct nwrap_entdata *const ed,
2611                                                  struct nwrap_entlist *const el)
2612 {
2613         struct nwrap_entlist *cursor;
2614         struct nwrap_entlist *el_new;
2615
2616         if (el == NULL) {
2617                 NWRAP_LOG(NWRAP_LOG_ERROR, "list is NULL, can not add");
2618                 return false;
2619         }
2620
2621
2622         for (cursor = el; cursor->next != NULL; cursor = cursor->next)
2623         {
2624                 if (cursor->ed == ed) {
2625                         /* The entry already exists in this list. */
2626                         return true;
2627                 }
2628         }
2629
2630         if (cursor->ed == ed) {
2631                 /* The entry already exists in this list. */
2632                 return true;
2633         }
2634
2635         el_new = nwrap_entlist_init(ed);
2636         if (el_new == NULL) {
2637                 return false;
2638         }
2639
2640         cursor->next = el_new;
2641         return true;
2642 }
2643
2644 static bool nwrap_ed_inventarize(char *const name,
2645                                  struct nwrap_entdata *const ed)
2646 {
2647         ENTRY e;
2648         ENTRY *p;
2649         bool ok;
2650
2651         e.key = name;
2652         e.data = NULL;
2653
2654         NWRAP_LOG(NWRAP_LOG_DEBUG, "Searching name: %s", e.key);
2655
2656         p = hsearch(e, FIND);
2657         if (p == NULL) {
2658                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Name %s not found. Adding...", name);
2659                 ok = nwrap_ed_inventarize_add_new(name, ed);
2660         } else {
2661                 struct nwrap_entlist *el = (struct nwrap_entlist *)p->data;
2662
2663                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Name %s found. Add record to list.", name);
2664                 ok = nwrap_ed_inventarize_add_to_existing(ed, el);
2665         }
2666
2667         return ok;
2668 }
2669
2670 static bool nwrap_add_hname(struct nwrap_entdata *const ed)
2671 {
2672         char *const h_name = (char *const)(ed->ht.h_name);
2673         unsigned i;
2674         bool ok;
2675
2676         ok = nwrap_ed_inventarize(h_name, ed);
2677         if (!ok) {
2678                 return false;
2679         }
2680
2681         if (ed->ht.h_aliases == NULL) {
2682                 return true;
2683         }
2684
2685         /* Itemize aliases */
2686         for (i = 0; ed->ht.h_aliases[i] != NULL; ++i) {
2687                 char *h_name_alias;
2688
2689                 h_name_alias = ed->ht.h_aliases[i];
2690
2691                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Add alias: %s", h_name_alias);
2692
2693                 if (!nwrap_ed_inventarize(h_name_alias, ed)) {
2694                         NWRAP_LOG(NWRAP_LOG_ERROR,
2695                                   "Unable to add alias: %s", h_name_alias);
2696                         return false;
2697                 }
2698         }
2699
2700         return true;
2701 }
2702
2703 static bool nwrap_he_parse_line(struct nwrap_cache *nwrap, char *line)
2704 {
2705         struct nwrap_he *nwrap_he = (struct nwrap_he *)nwrap->private_data;
2706         bool do_aliases = true;
2707         ssize_t aliases_count = 0;
2708         char *p;
2709         char *i;
2710         char *n;
2711
2712         char *ip;
2713         bool ok;
2714
2715         struct nwrap_entdata *ed = (struct nwrap_entdata *)
2716                                    malloc(sizeof(struct nwrap_entdata));
2717         if (ed == NULL) {
2718                 NWRAP_LOG(NWRAP_LOG_ERROR,
2719                           "Unable to allocate memory for nwrap_entdata");
2720                 return false;
2721         }
2722         ZERO_STRUCTP(ed);
2723
2724         i = line;
2725
2726         /*
2727          * IP
2728          */
2729
2730         /* Walk to first char */
2731         for (p = i; *p != '.' && *p != ':' && !isxdigit((int) *p); p++) {
2732                 if (*p == '\0') {
2733                         NWRAP_LOG(NWRAP_LOG_ERROR,
2734                                   "Invalid line[%s]: '%s'",
2735                                   line, i);
2736                         free(ed);
2737                         return false;
2738                 }
2739         }
2740
2741         for (i = p; !isspace((int)*p); p++) {
2742                 if (*p == '\0') {
2743                         NWRAP_LOG(NWRAP_LOG_ERROR,
2744                                   "Invalid line[%s]: '%s'",
2745                                   line, i);
2746                         free(ed);
2747                         return false;
2748                 }
2749         }
2750
2751         *p = '\0';
2752
2753         if (inet_pton(AF_INET, i, ed->addr.host_addr)) {
2754                 ed->ht.h_addrtype = AF_INET;
2755                 ed->ht.h_length = 4;
2756 #ifdef HAVE_IPV6
2757         } else if (inet_pton(AF_INET6, i, ed->addr.host_addr)) {
2758                 ed->ht.h_addrtype = AF_INET6;
2759                 ed->ht.h_length = 16;
2760 #endif
2761         } else {
2762                 NWRAP_LOG(NWRAP_LOG_ERROR,
2763                           "Invalid line[%s]: '%s'",
2764                           line, i);
2765
2766                 free(ed);
2767                 return false;
2768         }
2769         ip = i;
2770
2771         ok = nwrap_vector_add_item(&(ed->nwrap_addrdata),
2772                                    (void *const)ed->addr.host_addr);
2773         if (!ok) {
2774                 NWRAP_LOG(NWRAP_LOG_ERROR, "Unable to add addrdata to vector");
2775                 free(ed);
2776                 return false;
2777         }
2778         ed->ht.h_addr_list = nwrap_vector_head(&ed->nwrap_addrdata);
2779
2780         p++;
2781
2782         /*
2783          * FQDN
2784          */
2785
2786         /* Walk to first char */
2787         for (n = p; *p != '_' && !isalnum((int) *p); p++) {
2788                 if (*p == '\0') {
2789                         NWRAP_LOG(NWRAP_LOG_ERROR,
2790                                   "Invalid line[%s]: '%s'",
2791                                   line, n);
2792
2793                         free(ed);
2794                         return false;
2795                 }
2796         }
2797
2798         for (n = p; !isspace((int)*p); p++) {
2799                 if (*p == '\0') {
2800                         do_aliases = false;
2801                         break;
2802                 }
2803         }
2804
2805         *p = '\0';
2806
2807         /* Convert to lowercase. This operate on same memory region */
2808         str_tolower(n, n);
2809         ed->ht.h_name = n;
2810
2811         /* glib's getent always dereferences he->h_aliases */
2812         ed->ht.h_aliases = malloc(sizeof(char *));
2813         if (ed->ht.h_aliases == NULL) {
2814                 free(ed);
2815                 return false;
2816         }
2817         ed->ht.h_aliases[0] = NULL;
2818
2819         /*
2820          * Aliases
2821          */
2822         while (do_aliases) {
2823                 char **aliases;
2824                 char *a;
2825
2826                 p++;
2827
2828                 /* Walk to first char */
2829                 for (a = p; *p != '_' && !isalnum((int) *p); p++) {
2830                         if (*p == '\0') {
2831                                 do_aliases = false;
2832                                 break;
2833                         }
2834                 }
2835                 /* Only trailing spaces are left */
2836                 if (!do_aliases) {
2837                         break;
2838                 }
2839
2840                 for (a = p; !isspace((int)*p); p++) {
2841                         if (*p == '\0') {
2842                                 do_aliases = false;
2843                                 break;
2844                         }
2845                 }
2846
2847                 *p = '\0';
2848
2849                 aliases = realloc(ed->ht.h_aliases, sizeof(char *) * (aliases_count + 2));
2850                 if (aliases == NULL) {
2851                         free(ed);
2852                         return false;
2853                 }
2854                 ed->ht.h_aliases = aliases;
2855
2856                 str_tolower(a, a);
2857                 aliases[aliases_count] = a;
2858                 aliases[aliases_count + 1] = NULL;
2859
2860                 aliases_count += 1;
2861         }
2862
2863         ok = nwrap_vector_add_item(&(nwrap_he->entries), (void *const)ed);
2864         if (!ok) {
2865                 NWRAP_LOG(NWRAP_LOG_ERROR, "Unable to add entry to vector");
2866                 free(ed);
2867                 return false;
2868         }
2869
2870         ed->aliases_count = aliases_count;
2871         /* Inventarize item */
2872         ok = nwrap_add_hname(ed);
2873         if (!ok) {
2874                 return false;
2875         }
2876
2877         ok = nwrap_ed_inventarize(ip, ed);
2878         if (!ok) {
2879                 return false;
2880         }
2881
2882         nwrap_he->num++;
2883         return true;
2884 }
2885
2886 static void nwrap_he_unload(struct nwrap_cache *nwrap)
2887 {
2888         struct nwrap_he *nwrap_he =
2889                 (struct nwrap_he *)nwrap->private_data;
2890         struct nwrap_entdata *ed;
2891         struct nwrap_entlist *el;
2892         size_t i;
2893
2894         nwrap_vector_foreach (ed, nwrap_he->entries, i)
2895         {
2896                 SAFE_FREE(ed->nwrap_addrdata.items);
2897                 SAFE_FREE(ed->ht.h_aliases);
2898                 SAFE_FREE(ed);
2899         }
2900         SAFE_FREE(nwrap_he->entries.items);
2901         nwrap_he->entries.count = nwrap_he->entries.capacity = 0;
2902
2903         nwrap_vector_foreach(el, nwrap_he->lists, i)
2904         {
2905                 while (el != NULL) {
2906                         struct nwrap_entlist *el_next;
2907
2908                         el_next = el->next;
2909                         SAFE_FREE(el);
2910                         el = el_next;
2911                 }
2912         }
2913         SAFE_FREE(nwrap_he->lists.items);
2914         nwrap_he->lists.count = nwrap_he->lists.capacity = 0;
2915
2916         nwrap_he->num = 0;
2917         nwrap_he->idx = 0;
2918 }
2919
2920
2921 /* user functions */
2922 static struct passwd *nwrap_files_getpwnam(struct nwrap_backend *b,
2923                                            const char *name)
2924 {
2925         int i;
2926         bool ok;
2927
2928         (void) b; /* unused */
2929
2930         NWRAP_LOG(NWRAP_LOG_DEBUG, "Lookup user %s in files", name);
2931
2932         ok = nwrap_files_cache_reload(nwrap_pw_global.cache);
2933         if (!ok) {
2934                 NWRAP_LOG(NWRAP_LOG_ERROR, "Error loading passwd file");
2935                 return NULL;
2936         }
2937
2938         for (i=0; i<nwrap_pw_global.num; i++) {
2939                 if (strcmp(nwrap_pw_global.list[i].pw_name, name) == 0) {
2940                         NWRAP_LOG(NWRAP_LOG_DEBUG, "user[%s] found", name);
2941                         return &nwrap_pw_global.list[i];
2942                 }
2943                 NWRAP_LOG(NWRAP_LOG_DEBUG,
2944                           "user[%s] does not match [%s]",
2945                           name,
2946                           nwrap_pw_global.list[i].pw_name);
2947         }
2948
2949         NWRAP_LOG(NWRAP_LOG_DEBUG, "user[%s] not found\n", name);
2950
2951         errno = ENOENT;
2952         return NULL;
2953 }
2954
2955 static int nwrap_files_getpwnam_r(struct nwrap_backend *b,
2956                                   const char *name, struct passwd *pwdst,
2957                                   char *buf, size_t buflen, struct passwd **pwdstp)
2958 {
2959         struct passwd *pw;
2960
2961         pw = nwrap_files_getpwnam(b, name);
2962         if (!pw) {
2963                 if (errno == 0) {
2964                         return ENOENT;
2965                 }
2966                 return errno;
2967         }
2968
2969         return nwrap_pw_copy_r(pw, pwdst, buf, buflen, pwdstp);
2970 }
2971
2972 static struct passwd *nwrap_files_getpwuid(struct nwrap_backend *b,
2973                                            uid_t uid)
2974 {
2975         int i;
2976         bool ok;
2977
2978         (void) b; /* unused */
2979
2980         ok = nwrap_files_cache_reload(nwrap_pw_global.cache);
2981         if (!ok) {
2982                 NWRAP_LOG(NWRAP_LOG_ERROR, "Error loading passwd file");
2983                 return NULL;
2984         }
2985
2986         for (i=0; i<nwrap_pw_global.num; i++) {
2987                 if (nwrap_pw_global.list[i].pw_uid == uid) {
2988                         NWRAP_LOG(NWRAP_LOG_DEBUG, "uid[%u] found", uid);
2989                         return &nwrap_pw_global.list[i];
2990                 }
2991                 NWRAP_LOG(NWRAP_LOG_DEBUG,
2992                           "uid[%u] does not match [%u]",
2993                           uid,
2994                           nwrap_pw_global.list[i].pw_uid);
2995         }
2996
2997         NWRAP_LOG(NWRAP_LOG_DEBUG, "uid[%u] not found\n", uid);
2998
2999         errno = ENOENT;
3000         return NULL;
3001 }
3002
3003 static int nwrap_files_getpwuid_r(struct nwrap_backend *b,
3004                                   uid_t uid, struct passwd *pwdst,
3005                                   char *buf, size_t buflen, struct passwd **pwdstp)
3006 {
3007         struct passwd *pw;
3008
3009         pw = nwrap_files_getpwuid(b, uid);
3010         if (!pw) {
3011                 if (errno == 0) {
3012                         return ENOENT;
3013                 }
3014                 return errno;
3015         }
3016
3017         return nwrap_pw_copy_r(pw, pwdst, buf, buflen, pwdstp);
3018 }
3019
3020 /* user enum functions */
3021 static void nwrap_files_setpwent(struct nwrap_backend *b)
3022 {
3023         (void) b; /* unused */
3024
3025         nwrap_pw_global.idx = 0;
3026 }
3027
3028 static struct passwd *nwrap_files_getpwent(struct nwrap_backend *b)
3029 {
3030         struct passwd *pw;
3031
3032         (void) b; /* unused */
3033
3034         if (nwrap_pw_global.idx == 0) {
3035                 bool ok;
3036                 ok = nwrap_files_cache_reload(nwrap_pw_global.cache);
3037                 if (!ok) {
3038                         NWRAP_LOG(NWRAP_LOG_ERROR, "Error loading passwd file");
3039                         return NULL;
3040                 }
3041         }
3042
3043         if (nwrap_pw_global.idx >= nwrap_pw_global.num) {
3044                 errno = ENOENT;
3045                 return NULL;
3046         }
3047
3048         pw = &nwrap_pw_global.list[nwrap_pw_global.idx++];
3049
3050         NWRAP_LOG(NWRAP_LOG_DEBUG,
3051                   "return user[%s] uid[%u]",
3052                   pw->pw_name, pw->pw_uid);
3053
3054         return pw;
3055 }
3056
3057 static int nwrap_files_getpwent_r(struct nwrap_backend *b,
3058                                   struct passwd *pwdst, char *buf,
3059                                   size_t buflen, struct passwd **pwdstp)
3060 {
3061         struct passwd *pw;
3062
3063         pw = nwrap_files_getpwent(b);
3064         if (!pw) {
3065                 if (errno == 0) {
3066                         return ENOENT;
3067                 }
3068                 return errno;
3069         }
3070
3071         return nwrap_pw_copy_r(pw, pwdst, buf, buflen, pwdstp);
3072 }
3073
3074 static void nwrap_files_endpwent(struct nwrap_backend *b)
3075 {
3076         (void) b; /* unused */
3077
3078         nwrap_pw_global.idx = 0;
3079 }
3080
3081 /* shadow */
3082
3083 #if defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM)
3084
3085 #ifdef HAVE_SETSPENT
3086 static void nwrap_files_setspent(void)
3087 {
3088         nwrap_sp_global.idx = 0;
3089 }
3090
3091 static struct spwd *nwrap_files_getspent(void)
3092 {
3093         struct spwd *sp;
3094
3095         if (nwrap_sp_global.idx == 0) {
3096                 bool ok;
3097
3098                 ok = nwrap_files_cache_reload(nwrap_sp_global.cache);
3099                 if (!ok) {
3100                         NWRAP_LOG(NWRAP_LOG_ERROR, "Error loading shadow file");
3101                         return NULL;
3102                 }
3103         }
3104
3105         if (nwrap_sp_global.idx >= nwrap_sp_global.num) {
3106                 errno = ENOENT;
3107                 return NULL;
3108         }
3109
3110         sp = &nwrap_sp_global.list[nwrap_sp_global.idx++];
3111
3112         NWRAP_LOG(NWRAP_LOG_DEBUG,
3113                   "return user[%s]",
3114                   sp->sp_namp);
3115
3116         return sp;
3117 }
3118
3119 static void nwrap_files_endspent(void)
3120 {
3121         nwrap_sp_global.idx = 0;
3122 }
3123 #endif /* HAVE_SETSPENT */
3124
3125 static struct spwd *nwrap_files_getspnam(const char *name)
3126 {
3127         int i;
3128         bool ok;
3129
3130         NWRAP_LOG(NWRAP_LOG_DEBUG, "Lookup user %s in files", name);
3131
3132         ok = nwrap_files_cache_reload(nwrap_sp_global.cache);
3133         if (!ok) {
3134                 NWRAP_LOG(NWRAP_LOG_ERROR, "Error loading shadow file");
3135                 return NULL;
3136         }
3137
3138         for (i=0; i<nwrap_sp_global.num; i++) {
3139                 if (strcmp(nwrap_sp_global.list[i].sp_namp, name) == 0) {
3140                         NWRAP_LOG(NWRAP_LOG_DEBUG, "user[%s] found", name);
3141                         return &nwrap_sp_global.list[i];
3142                 }
3143                 NWRAP_LOG(NWRAP_LOG_DEBUG,
3144                           "user[%s] does not match [%s]",
3145                           name,
3146                           nwrap_sp_global.list[i].sp_namp);
3147         }
3148
3149         NWRAP_LOG(NWRAP_LOG_DEBUG, "user[%s] not found\n", name);
3150
3151         errno = ENOENT;
3152         return NULL;
3153 }
3154 #endif /* defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM) */
3155
3156 /* misc functions */
3157 static int nwrap_files_initgroups(struct nwrap_backend *b,
3158                                   const char *user,
3159                                   gid_t group)
3160 {
3161         struct group *grp;
3162         gid_t *groups;
3163         int size = 1;
3164         int rc;
3165
3166         groups = (gid_t *)malloc(size * sizeof(gid_t));
3167         if (groups == NULL) {
3168                 NWRAP_LOG(NWRAP_LOG_ERROR, "Out of memory");
3169                 errno = ENOMEM;
3170                 return -1;
3171         }
3172         groups[0] = group;
3173
3174         nwrap_files_setgrent(b);
3175         while ((grp = nwrap_files_getgrent(b)) != NULL) {
3176                 int i = 0;
3177
3178                 NWRAP_LOG(NWRAP_LOG_DEBUG,
3179                           "Inspecting %s for group membership",
3180                           grp->gr_name);
3181
3182                 for (i=0; grp->gr_mem && grp->gr_mem[i] != NULL; i++) {
3183                         if (group != grp->gr_gid &&
3184                             (strcmp(user, grp->gr_mem[i]) == 0)) {
3185                                 NWRAP_LOG(NWRAP_LOG_DEBUG,
3186                                           "%s is member of %s",
3187                                           user,
3188                                           grp->gr_name);
3189
3190                                 groups = (gid_t *)realloc(groups,
3191                                                           (size + 1) * sizeof(gid_t));
3192                                 if (groups == NULL) {
3193                                         NWRAP_LOG(NWRAP_LOG_ERROR,
3194                                                   "Out of memory");
3195                                         errno = ENOMEM;
3196                                         return -1;
3197                                 }
3198
3199                                 groups[size] = grp->gr_gid;
3200                                 size++;
3201                         }
3202                 }
3203         }
3204
3205         nwrap_files_endgrent(b);
3206
3207         NWRAP_LOG(NWRAP_LOG_DEBUG,
3208                   "%s is member of %d groups",
3209                   user, size);
3210
3211         /* This really only works if uid_wrapper is loaded */
3212         rc = setgroups(size, groups);
3213
3214         free(groups);
3215
3216         return rc;
3217 }
3218
3219 /* group functions */
3220 static struct group *nwrap_files_getgrnam(struct nwrap_backend *b,
3221                                           const char *name)
3222 {
3223         int i;
3224         bool ok;
3225
3226         (void) b; /* unused */
3227
3228         ok = nwrap_files_cache_reload(nwrap_gr_global.cache);
3229         if (!ok) {
3230                 NWRAP_LOG(NWRAP_LOG_ERROR, "Error loading group file");
3231                 return NULL;
3232         }
3233
3234         for (i=0; i<nwrap_gr_global.num; i++) {
3235                 if (strcmp(nwrap_gr_global.list[i].gr_name, name) == 0) {
3236                         NWRAP_LOG(NWRAP_LOG_DEBUG, "group[%s] found", name);
3237                         return &nwrap_gr_global.list[i];
3238                 }
3239                 NWRAP_LOG(NWRAP_LOG_DEBUG,
3240                           "group[%s] does not match [%s]",
3241                           name,
3242                           nwrap_gr_global.list[i].gr_name);
3243         }
3244
3245         NWRAP_LOG(NWRAP_LOG_DEBUG, "group[%s] not found", name);
3246
3247         errno = ENOENT;
3248         return NULL;
3249 }
3250
3251 static int nwrap_files_getgrnam_r(struct nwrap_backend *b,
3252                                   const char *name, struct group *grdst,
3253                                   char *buf, size_t buflen, struct group **grdstp)
3254 {
3255         struct group *gr;
3256
3257         gr = nwrap_files_getgrnam(b, name);
3258         if (!gr) {
3259                 if (errno == 0) {
3260                         return ENOENT;
3261                 }
3262                 return errno;
3263         }
3264
3265         return nwrap_gr_copy_r(gr, grdst, buf, buflen, grdstp);
3266 }
3267
3268 static struct group *nwrap_files_getgrgid(struct nwrap_backend *b,
3269                                           gid_t gid)
3270 {
3271         int i;
3272         bool ok;
3273
3274         (void) b; /* unused */
3275
3276         ok = nwrap_files_cache_reload(nwrap_gr_global.cache);
3277         if (!ok) {
3278                 NWRAP_LOG(NWRAP_LOG_ERROR, "Error loading group file");
3279                 return NULL;
3280         }
3281
3282         for (i=0; i<nwrap_gr_global.num; i++) {
3283                 if (nwrap_gr_global.list[i].gr_gid == gid) {
3284                         NWRAP_LOG(NWRAP_LOG_DEBUG, "gid[%u] found", gid);
3285                         return &nwrap_gr_global.list[i];
3286                 }
3287                 NWRAP_LOG(NWRAP_LOG_DEBUG,
3288                           "gid[%u] does not match [%u]",
3289                           gid,
3290                           nwrap_gr_global.list[i].gr_gid);
3291         }
3292
3293         NWRAP_LOG(NWRAP_LOG_DEBUG, "gid[%u] not found", gid);
3294
3295         errno = ENOENT;
3296         return NULL;
3297 }
3298
3299 static int nwrap_files_getgrgid_r(struct nwrap_backend *b,
3300                                   gid_t gid, struct group *grdst,
3301                                   char *buf, size_t buflen, struct group **grdstp)
3302 {
3303         struct group *gr;
3304
3305         gr = nwrap_files_getgrgid(b, gid);
3306         if (!gr) {
3307                 if (errno == 0) {
3308                         return ENOENT;
3309                 }
3310                 return errno;
3311         }
3312
3313         return nwrap_gr_copy_r(gr, grdst, buf, buflen, grdstp);
3314 }
3315
3316 /* group enum functions */
3317 static void nwrap_files_setgrent(struct nwrap_backend *b)
3318 {
3319         (void) b; /* unused */
3320
3321         nwrap_gr_global.idx = 0;
3322 }
3323
3324 static struct group *nwrap_files_getgrent(struct nwrap_backend *b)
3325 {
3326         struct group *gr;
3327
3328         (void) b; /* unused */
3329
3330         if (nwrap_gr_global.idx == 0) {
3331                 bool ok;
3332
3333                 ok = nwrap_files_cache_reload(nwrap_gr_global.cache);
3334                 if (!ok) {
3335                         NWRAP_LOG(NWRAP_LOG_ERROR, "Error loading group file");
3336                         return NULL;
3337                 }
3338         }
3339
3340         if (nwrap_gr_global.idx >= nwrap_gr_global.num) {
3341                 errno = ENOENT;
3342                 return NULL;
3343         }
3344
3345         gr = &nwrap_gr_global.list[nwrap_gr_global.idx++];
3346
3347         NWRAP_LOG(NWRAP_LOG_DEBUG,
3348                   "return group[%s] gid[%u]",
3349                   gr->gr_name, gr->gr_gid);
3350
3351         return gr;
3352 }
3353
3354 static int nwrap_files_getgrent_r(struct nwrap_backend *b,
3355                                   struct group *grdst, char *buf,
3356                                   size_t buflen, struct group **grdstp)
3357 {
3358         struct group *gr;
3359
3360         gr = nwrap_files_getgrent(b);
3361         if (!gr) {
3362                 if (errno == 0) {
3363                         return ENOENT;
3364                 }
3365                 return errno;
3366         }
3367
3368         return nwrap_gr_copy_r(gr, grdst, buf, buflen, grdstp);
3369 }
3370
3371 static void nwrap_files_endgrent(struct nwrap_backend *b)
3372 {
3373         (void) b; /* unused */
3374
3375         nwrap_gr_global.idx = 0;
3376 }
3377
3378 /* hosts functions */
3379 static int nwrap_files_gethostbyname(const char *name, int af,
3380                                      struct hostent *result,
3381                                      struct nwrap_vector *addr_list)
3382 {
3383         struct nwrap_entlist *el;
3384         struct hostent *he;
3385         char *h_name_lower;
3386         ENTRY e;
3387         ENTRY *e_p;
3388         char canon_name[DNS_NAME_MAX] = { 0 };
3389         size_t name_len;
3390         bool he_found = false;
3391         bool ok;
3392
3393         ok = nwrap_files_cache_reload(nwrap_he_global.cache);
3394         if (!ok) {
3395                 NWRAP_LOG(NWRAP_LOG_ERROR, "error loading hosts file");
3396                 goto no_ent;
3397         }
3398
3399         name_len = strlen(name);
3400         if (name_len < sizeof(canon_name) && name[name_len - 1] == '.') {
3401                 strncpy(canon_name, name, name_len - 1);
3402                 name = canon_name;
3403         }
3404
3405         if (!str_tolower_copy(&h_name_lower, name)) {
3406                 NWRAP_LOG(NWRAP_LOG_DEBUG,
3407                           "Out of memory while converting to lower case");
3408                 goto no_ent;
3409         }
3410
3411         /* Look at hash table for element */
3412         NWRAP_LOG(NWRAP_LOG_DEBUG, "Searching for name: %s", h_name_lower);
3413         e.key = h_name_lower;
3414         e.data = NULL;
3415         e_p = hsearch(e, FIND);
3416         if (e_p == NULL) {
3417                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Name %s not found.", h_name_lower);
3418                 SAFE_FREE(h_name_lower);
3419                 goto no_ent;
3420         }
3421         SAFE_FREE(h_name_lower);
3422
3423         /* Always cleanup vector and results */
3424         if (!nwrap_vector_is_initialized(addr_list)) {
3425                 if (!nwrap_vector_init(addr_list)) {
3426                         NWRAP_LOG(NWRAP_LOG_DEBUG,
3427                                   "Unable to initialize memory for addr_list vector");
3428                         goto no_ent;
3429                 }
3430         } else {
3431                 /* When vector is initialized data are valid no more.
3432                  * Quick way how to free vector is: */
3433                 addr_list->count = 0;
3434         }
3435
3436         /* Iterate through results */
3437         for (el = (struct nwrap_entlist *)e_p->data; el != NULL; el = el->next)
3438         {
3439                 he = &(el->ed->ht);
3440
3441                 /* Filter by address familiy if provided */
3442                 if (af != AF_UNSPEC && he->h_addrtype != af) {
3443                         continue;
3444                 }
3445
3446                 /*
3447                  * GLIBC HACK?
3448                  * glibc doesn't return ipv6 addresses when AF_UNSPEC is used
3449                  */
3450                 if (af == AF_UNSPEC && he->h_addrtype != AF_INET) {
3451                         continue;
3452                 }
3453
3454                 if (!he_found) {
3455                         memcpy(result, he, sizeof(struct hostent));
3456                         NWRAP_LOG(NWRAP_LOG_DEBUG,
3457                                   "Name found. Returning record for %s",
3458                                   he->h_name);
3459                         he_found = true;
3460                 }
3461                 nwrap_vector_merge(addr_list, &el->ed->nwrap_addrdata);
3462                 result->h_addr_list = nwrap_vector_head(addr_list);
3463         }
3464
3465         if (he_found) {
3466                 return 0;
3467         }
3468         NWRAP_LOG(NWRAP_LOG_DEBUG,
3469                   "Name found in database. No records matches type.");
3470
3471 no_ent:
3472         errno = ENOENT;
3473         return -1;
3474 }
3475
3476 #ifdef HAVE_GETHOSTBYNAME_R
3477 static int nwrap_gethostbyname_r(const char *name,
3478                                  struct hostent *ret,
3479                                  char *buf, size_t buflen,
3480                                  struct hostent **result, int *h_errnop)
3481 {
3482         struct nwrap_vector *addr_list = malloc(sizeof(struct nwrap_vector));
3483         int rc;
3484
3485         if (addr_list == NULL) {
3486                 NWRAP_LOG(NWRAP_LOG_ERROR,
3487                           "Unable to allocate memory for address list");
3488                 errno = ENOENT;
3489                 return -1;
3490         }
3491
3492         ZERO_STRUCTP(addr_list);
3493
3494         rc = nwrap_files_gethostbyname(name, AF_UNSPEC, ret, addr_list);
3495         if (rc == -1) {
3496                 *h_errnop = h_errno;
3497                 if (addr_list->items != NULL) {
3498                         free(addr_list->items);
3499                 }
3500                 SAFE_FREE(addr_list);
3501                 errno = ENOENT;
3502                 return -1;
3503         }
3504
3505         if (buflen < (addr_list->count * sizeof(void *))) {
3506                 SAFE_FREE(addr_list->items);
3507                 SAFE_FREE(addr_list);
3508                 return ERANGE;
3509         }
3510
3511         /* Copy all to user provided buffer and change
3512          * pointers in returned structure.
3513          * +1 is for ending NULL pointer. */
3514         memcpy(buf, addr_list->items, (addr_list->count + 1) * sizeof(void *));
3515
3516         free(addr_list->items);
3517         free(addr_list);
3518
3519         ret->h_addr_list = (char **)buf;
3520         *result = ret;
3521         return 0;
3522 }
3523
3524 int gethostbyname_r(const char *name,
3525                     struct hostent *ret,
3526                     char *buf, size_t buflen,
3527                     struct hostent **result, int *h_errnop)
3528 {
3529         if (!nss_wrapper_hosts_enabled()) {
3530                 return libc_gethostbyname_r(name,
3531                                             ret,
3532                                             buf,
3533                                             buflen,
3534                                             result,
3535                                             h_errnop);
3536         }
3537
3538         return nwrap_gethostbyname_r(name, ret, buf, buflen, result, h_errnop);
3539 }
3540 #endif
3541
3542 static int nwrap_files_getaddrinfo(const char *name,
3543                                    unsigned short port,
3544                                    const struct addrinfo *hints,
3545                                    struct addrinfo **ai)
3546 {
3547         struct nwrap_entlist *el;
3548         struct hostent *he;
3549         struct addrinfo *ai_head = NULL;
3550         struct addrinfo *ai_cur = NULL;
3551         char *h_name_lower;
3552         size_t name_len;
3553         char canon_name[DNS_NAME_MAX] = { 0 };
3554         bool skip_canonname = false;
3555         ENTRY e = {
3556                 .key = NULL,
3557         };
3558         ENTRY *e_p = NULL;
3559         int rc;
3560         bool ok;
3561
3562         ok = nwrap_files_cache_reload(nwrap_he_global.cache);
3563         if (!ok) {
3564                 NWRAP_LOG(NWRAP_LOG_ERROR, "error loading hosts file");
3565                 return EAI_SYSTEM;
3566         }
3567
3568         name_len = strlen(name);
3569         if (name_len < DNS_NAME_MAX && name[name_len - 1] == '.') {
3570                 strncpy(canon_name, name, name_len - 1);
3571                 name = canon_name;
3572         }
3573
3574         if (!str_tolower_copy(&h_name_lower, name)) {
3575                 NWRAP_LOG(NWRAP_LOG_DEBUG,
3576                           "Out of memory while converting to lower case");
3577                 return EAI_MEMORY;
3578         }
3579
3580         NWRAP_LOG(NWRAP_LOG_DEBUG, "Searching for name: %s", h_name_lower);
3581         e.key = h_name_lower;
3582         e.data = NULL;
3583         e_p = hsearch(e, FIND);
3584         if (e_p == NULL) {
3585                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Name %s not found.", h_name_lower);
3586                 SAFE_FREE(h_name_lower);
3587                 errno = ENOENT;
3588                 return EAI_NONAME;
3589         }
3590         NWRAP_LOG(NWRAP_LOG_DEBUG, "Name: %s found.", h_name_lower);
3591         SAFE_FREE(h_name_lower);
3592
3593         rc = EAI_NONAME;
3594         for (el = (struct nwrap_entlist *)e_p->data; el != NULL; el = el->next)
3595         {
3596                 int rc2;
3597                 struct addrinfo *ai_new = NULL;
3598
3599                 he = &(el->ed->ht);
3600
3601                 if (hints->ai_family != AF_UNSPEC &&
3602                     he->h_addrtype != hints->ai_family)
3603                 {
3604                         NWRAP_LOG(NWRAP_LOG_DEBUG,
3605                                   "Entry found but with wrong AF - "
3606                                   "remembering EAI_ADDRINFO.");
3607                         rc = EAI_ADDRFAMILY;
3608                         continue;
3609                 }
3610
3611                 /* Function allocates memory and returns it in ai. */
3612                 rc2 = nwrap_convert_he_ai(he,
3613                                          port,
3614                                          hints,
3615                                          &ai_new,
3616                                          skip_canonname);
3617                 if (rc2 != 0) {
3618                         NWRAP_LOG(NWRAP_LOG_ERROR, "Error converting he to ai");
3619                         if (ai_head != NULL) {
3620                                 freeaddrinfo(ai_head);
3621                         }
3622                         return rc2;
3623                 }
3624                 skip_canonname = true;
3625
3626                 if (ai_head == NULL) {
3627                         ai_head = ai_new;
3628                 }
3629                 if (ai_cur != NULL) {
3630                         ai_cur->ai_next = ai_new;
3631                 }
3632                 ai_cur = ai_new;
3633         }
3634
3635         if (ai_head != NULL) {
3636                 rc = 0;
3637         }
3638
3639         *ai = ai_head;
3640
3641         return rc;
3642 }
3643
3644 static struct hostent *nwrap_files_gethostbyaddr(const void *addr,
3645                                                  socklen_t len, int type)
3646 {
3647         struct hostent *he;
3648         char ip[NWRAP_INET_ADDRSTRLEN] = {0};
3649         struct nwrap_entdata *ed;
3650         const char *a;
3651         size_t i;
3652         bool ok;
3653
3654         (void) len; /* unused */
3655
3656         ok = nwrap_files_cache_reload(nwrap_he_global.cache);
3657         if (!ok) {
3658                 NWRAP_LOG(NWRAP_LOG_ERROR, "error loading hosts file");
3659                 return NULL;
3660         }
3661
3662         a = inet_ntop(type, addr, ip, sizeof(ip));
3663         if (a == NULL) {
3664                 errno = EINVAL;
3665                 return NULL;
3666         }
3667
3668         nwrap_vector_foreach(ed, nwrap_he_global.entries, i)
3669         {
3670                 he = &(ed->ht);
3671                 if (he->h_addrtype != type) {
3672                         continue;
3673                 }
3674
3675                 if (memcmp(addr, he->h_addr_list[0], he->h_length) == 0) {
3676                         return he;
3677                 }
3678         }
3679
3680         errno = ENOENT;
3681         return NULL;
3682 }
3683
3684 #ifdef HAVE_GETHOSTBYADDR_R
3685 static int nwrap_gethostbyaddr_r(const void *addr, socklen_t len, int type,
3686                                  struct hostent *ret,
3687                                  char *buf, size_t buflen,
3688                                  struct hostent **result, int *h_errnop)
3689 {
3690         *result = nwrap_files_gethostbyaddr(addr, len, type);
3691         if (*result != NULL) {
3692                 memset(buf, '\0', buflen);
3693                 *ret = **result;
3694                 return 0;
3695         } else {
3696                 *h_errnop = h_errno;
3697                 return -1;
3698         }
3699 }
3700
3701 int gethostbyaddr_r(const void *addr, socklen_t len, int type,
3702                     struct hostent *ret,
3703                     char *buf, size_t buflen,
3704                     struct hostent **result, int *h_errnop)
3705 {
3706         if (!nss_wrapper_hosts_enabled()) {
3707                 return libc_gethostbyaddr_r(addr,
3708                                             len,
3709                                             type,
3710                                             ret,
3711                                             buf,
3712                                             buflen,
3713                                             result,
3714                                             h_errnop);
3715         }
3716
3717         return nwrap_gethostbyaddr_r(addr, len, type, ret, buf, buflen, result, h_errnop);
3718 }
3719 #endif
3720
3721 /* hosts enum functions */
3722 static void nwrap_files_sethostent(void)
3723 {
3724         nwrap_he_global.idx = 0;
3725 }
3726
3727 static struct hostent *nwrap_files_gethostent(void)
3728 {
3729         struct hostent *he;
3730
3731         if (nwrap_he_global.idx == 0) {
3732                 bool ok;
3733
3734                 ok = nwrap_files_cache_reload(nwrap_he_global.cache);
3735                 if (!ok) {
3736                         NWRAP_LOG(NWRAP_LOG_ERROR, "Error loading hosts file");
3737                         return NULL;
3738                 }
3739         }
3740
3741         if (nwrap_he_global.idx >= nwrap_he_global.num) {
3742                 errno = ENOENT;
3743                 return NULL;
3744         }
3745
3746         he = &((struct nwrap_entdata *)nwrap_he_global.entries.items[nwrap_he_global.idx++])->ht;
3747
3748         NWRAP_LOG(NWRAP_LOG_DEBUG, "return hosts[%s]", he->h_name);
3749
3750         return he;
3751 }
3752
3753 static void nwrap_files_endhostent(void)
3754 {
3755         nwrap_he_global.idx = 0;
3756 }
3757
3758 /*
3759  * module backend
3760  */
3761
3762
3763 static struct passwd *nwrap_module_getpwnam(struct nwrap_backend *b,
3764                                             const char *name)
3765 {
3766         static struct passwd pwd;
3767         static char buf[1000];
3768         NSS_STATUS status;
3769
3770         if (!b->fns->_nss_getpwnam_r) {
3771                 return NULL;
3772         }
3773
3774         status = b->fns->_nss_getpwnam_r(name, &pwd, buf, sizeof(buf), &errno);
3775         if (status == NSS_STATUS_NOTFOUND) {
3776                 return NULL;
3777         }
3778         if (status != NSS_STATUS_SUCCESS) {
3779                 return NULL;
3780         }
3781
3782         return &pwd;
3783 }
3784
3785 static int nwrap_module_getpwnam_r(struct nwrap_backend *b,
3786                                    const char *name, struct passwd *pwdst,
3787                                    char *buf, size_t buflen, struct passwd **pwdstp)
3788 {
3789         int ret;
3790
3791         (void) b; /* unused */
3792         (void) pwdst; /* unused */
3793         (void) pwdstp; /* unused */
3794
3795         if (!b->fns->_nss_getpwnam_r) {
3796                 return NSS_STATUS_NOTFOUND;
3797         }
3798
3799         ret = b->fns->_nss_getpwnam_r(name, pwdst, buf, buflen, &errno);
3800         switch (ret) {
3801         case NSS_STATUS_SUCCESS:
3802                 return 0;
3803         case NSS_STATUS_NOTFOUND:
3804                 if (errno != 0) {
3805                         return errno;
3806                 }
3807                 return ENOENT;
3808         case NSS_STATUS_TRYAGAIN:
3809                 if (errno != 0) {
3810                         return errno;
3811                 }
3812                 return ERANGE;
3813         default:
3814                 if (errno != 0) {
3815                         return errno;
3816                 }
3817                 return ret;
3818         }
3819 }
3820
3821 static struct passwd *nwrap_module_getpwuid(struct nwrap_backend *b,
3822                                             uid_t uid)
3823 {
3824         static struct passwd pwd;
3825         static char buf[1000];
3826         NSS_STATUS status;
3827
3828         if (!b->fns->_nss_getpwuid_r) {
3829                 return NULL;
3830         }
3831
3832         status = b->fns->_nss_getpwuid_r(uid, &pwd, buf, sizeof(buf), &errno);
3833         if (status == NSS_STATUS_NOTFOUND) {
3834                 return NULL;
3835         }
3836         if (status != NSS_STATUS_SUCCESS) {
3837                 return NULL;
3838         }
3839         return &pwd;
3840 }
3841
3842 static int nwrap_module_getpwuid_r(struct nwrap_backend *b,
3843                                    uid_t uid, struct passwd *pwdst,
3844                                    char *buf, size_t buflen, struct passwd **pwdstp)
3845 {
3846         int ret;
3847
3848         (void) pwdstp; /* unused */
3849
3850         if (!b->fns->_nss_getpwuid_r) {
3851                 return ENOENT;
3852         }
3853
3854         ret = b->fns->_nss_getpwuid_r(uid, pwdst, buf, buflen, &errno);
3855         switch (ret) {
3856         case NSS_STATUS_SUCCESS:
3857                 return 0;
3858         case NSS_STATUS_NOTFOUND:
3859                 if (errno != 0) {
3860                         return errno;
3861                 }
3862                 return ENOENT;
3863         case NSS_STATUS_TRYAGAIN:
3864                 if (errno != 0) {
3865                         return errno;
3866                 }
3867                 return ERANGE;
3868         default:
3869                 if (errno != 0) {
3870                         return errno;
3871                 }
3872                 return ret;
3873         }
3874 }
3875
3876 static void nwrap_module_setpwent(struct nwrap_backend *b)
3877 {
3878         if (!b->fns->_nss_setpwent) {
3879                 return;
3880         }
3881
3882         b->fns->_nss_setpwent();
3883 }
3884
3885 static struct passwd *nwrap_module_getpwent(struct nwrap_backend *b)
3886 {
3887         static struct passwd pwd;
3888         static char buf[1000];
3889         NSS_STATUS status;
3890
3891         if (!b->fns->_nss_getpwent_r) {
3892                 return NULL;
3893         }
3894
3895         status = b->fns->_nss_getpwent_r(&pwd, buf, sizeof(buf), &errno);
3896         if (status == NSS_STATUS_NOTFOUND) {
3897                 return NULL;
3898         }
3899         if (status != NSS_STATUS_SUCCESS) {
3900                 return NULL;
3901         }
3902         return &pwd;
3903 }
3904
3905 static int nwrap_module_getpwent_r(struct nwrap_backend *b,
3906                                    struct passwd *pwdst, char *buf,
3907                                    size_t buflen, struct passwd **pwdstp)
3908 {
3909         int ret;
3910
3911         (void) pwdstp; /* unused */
3912
3913         if (!b->fns->_nss_getpwent_r) {
3914                 return ENOENT;
3915         }
3916
3917         ret = b->fns->_nss_getpwent_r(pwdst, buf, buflen, &errno);
3918         switch (ret) {
3919         case NSS_STATUS_SUCCESS:
3920                 return 0;
3921         case NSS_STATUS_NOTFOUND:
3922                 if (errno != 0) {
3923                         return errno;
3924                 }
3925                 return ENOENT;
3926         case NSS_STATUS_TRYAGAIN:
3927                 if (errno != 0) {
3928                         return errno;
3929                 }
3930                 return ERANGE;
3931         default:
3932                 if (errno != 0) {
3933                         return errno;
3934                 }
3935                 return ret;
3936         }
3937 }
3938
3939 static void nwrap_module_endpwent(struct nwrap_backend *b)
3940 {
3941         if (!b->fns->_nss_endpwent) {
3942                 return;
3943         }
3944
3945         b->fns->_nss_endpwent();
3946 }
3947
3948 static int nwrap_module_initgroups(struct nwrap_backend *b,
3949                                    const char *user, gid_t group)
3950 {
3951         gid_t *groups;
3952         long int start;
3953         long int size;
3954
3955         if (!b->fns->_nss_initgroups) {
3956                 return NSS_STATUS_UNAVAIL;
3957         }
3958
3959         return b->fns->_nss_initgroups(user, group, &start, &size, &groups, 0, &errno);
3960 }
3961
3962 static struct group *nwrap_module_getgrnam(struct nwrap_backend *b,
3963                                            const char *name)
3964 {
3965         static struct group grp;
3966         static char *buf;
3967         static int buflen = 1000;
3968         NSS_STATUS status;
3969
3970         if (!b->fns->_nss_getgrnam_r) {
3971                 return NULL;
3972         }
3973
3974         if (!buf) {
3975                 buf = (char *)malloc(buflen);
3976         }
3977 again:
3978         status = b->fns->_nss_getgrnam_r(name, &grp, buf, buflen, &errno);
3979         if (status == NSS_STATUS_TRYAGAIN) {
3980                 buflen *= 2;
3981                 buf = (char *)realloc(buf, buflen);
3982                 if (!buf) {
3983                         return NULL;
3984                 }
3985                 goto again;
3986         }
3987         if (status == NSS_STATUS_NOTFOUND) {
3988                 SAFE_FREE(buf);
3989                 return NULL;
3990         }
3991         if (status != NSS_STATUS_SUCCESS) {
3992                 SAFE_FREE(buf);
3993                 return NULL;
3994         }
3995         return &grp;
3996 }
3997
3998 static int nwrap_module_getgrnam_r(struct nwrap_backend *b,
3999                                    const char *name, struct group *grdst,
4000                                    char *buf, size_t buflen, struct group **grdstp)
4001 {
4002         int ret;
4003
4004         (void) grdstp; /* unused */
4005
4006         if (!b->fns->_nss_getgrnam_r) {
4007                 return ENOENT;
4008         }
4009
4010         ret = b->fns->_nss_getgrnam_r(name, grdst, buf, buflen, &errno);
4011         switch (ret) {
4012         case NSS_STATUS_SUCCESS:
4013                 return 0;
4014         case NSS_STATUS_NOTFOUND:
4015                 if (errno != 0) {
4016                         return errno;
4017                 }
4018                 return ENOENT;
4019         case NSS_STATUS_TRYAGAIN:
4020                 if (errno != 0) {
4021                         return errno;
4022                 }
4023                 return ERANGE;
4024         default:
4025                 if (errno != 0) {
4026                         return errno;
4027                 }
4028                 return ret;
4029         }
4030 }
4031
4032 static struct group *nwrap_module_getgrgid(struct nwrap_backend *b,
4033                                            gid_t gid)
4034 {
4035         static struct group grp;
4036         static char *buf;
4037         static int buflen = 1000;
4038         NSS_STATUS status;
4039
4040         if (!b->fns->_nss_getgrgid_r) {
4041                 return NULL;
4042         }
4043
4044         if (!buf) {
4045                 buf = (char *)malloc(buflen);
4046         }
4047
4048 again:
4049         status = b->fns->_nss_getgrgid_r(gid, &grp, buf, buflen, &errno);
4050         if (status == NSS_STATUS_TRYAGAIN) {
4051                 buflen *= 2;
4052                 buf = (char *)realloc(buf, buflen);
4053                 if (!buf) {
4054                         return NULL;
4055                 }
4056                 goto again;
4057         }
4058         if (status == NSS_STATUS_NOTFOUND) {
4059                 SAFE_FREE(buf);
4060                 return NULL;
4061         }
4062         if (status != NSS_STATUS_SUCCESS) {
4063                 SAFE_FREE(buf);
4064                 return NULL;
4065         }
4066         return &grp;
4067 }
4068
4069 static int nwrap_module_getgrgid_r(struct nwrap_backend *b,
4070                                    gid_t gid, struct group *grdst,
4071                                    char *buf, size_t buflen, struct group **grdstp)
4072 {
4073         int ret;
4074
4075         (void) grdstp; /* unused */
4076
4077         if (!b->fns->_nss_getgrgid_r) {
4078                 return ENOENT;
4079         }
4080
4081         ret = b->fns->_nss_getgrgid_r(gid, grdst, buf, buflen, &errno);
4082         switch (ret) {
4083         case NSS_STATUS_SUCCESS:
4084                 return 0;
4085         case NSS_STATUS_NOTFOUND:
4086                 if (errno != 0) {
4087                         return errno;
4088                 }
4089                 return ENOENT;
4090         case NSS_STATUS_TRYAGAIN:
4091                 if (errno != 0) {
4092                         return errno;
4093                 }
4094                 return ERANGE;
4095         default:
4096                 if (errno != 0) {
4097                         return errno;
4098                 }
4099                 return ret;
4100         }
4101 }
4102
4103 static void nwrap_module_setgrent(struct nwrap_backend *b)
4104 {
4105         if (!b->fns->_nss_setgrent) {
4106                 return;
4107         }
4108
4109         b->fns->_nss_setgrent();
4110 }
4111
4112 static struct group *nwrap_module_getgrent(struct nwrap_backend *b)
4113 {
4114         static struct group grp;
4115         static char *buf;
4116         static int buflen = 1024;
4117         NSS_STATUS status;
4118
4119         if (!b->fns->_nss_getgrent_r) {
4120                 return NULL;
4121         }
4122
4123         if (!buf) {
4124                 buf = (char *)malloc(buflen);
4125         }
4126
4127 again:
4128         status = b->fns->_nss_getgrent_r(&grp, buf, buflen, &errno);
4129         if (status == NSS_STATUS_TRYAGAIN) {
4130                 buflen *= 2;
4131                 buf = (char *)realloc(buf, buflen);
4132                 if (!buf) {
4133                         return NULL;
4134                 }
4135                 goto again;
4136         }
4137         if (status == NSS_STATUS_NOTFOUND) {
4138                 SAFE_FREE(buf);
4139                 return NULL;
4140         }
4141         if (status != NSS_STATUS_SUCCESS) {
4142                 SAFE_FREE(buf);
4143                 return NULL;
4144         }
4145         return &grp;
4146 }
4147
4148 static int nwrap_module_getgrent_r(struct nwrap_backend *b,
4149                                    struct group *grdst, char *buf,
4150                                    size_t buflen, struct group **grdstp)
4151 {
4152         int ret;
4153
4154         (void) grdstp; /* unused */
4155
4156         if (!b->fns->_nss_getgrent_r) {
4157                 return ENOENT;
4158         }
4159
4160         ret = b->fns->_nss_getgrent_r(grdst, buf, buflen, &errno);
4161         switch (ret) {
4162         case NSS_STATUS_SUCCESS:
4163                 return 0;
4164         case NSS_STATUS_NOTFOUND:
4165                 if (errno != 0) {
4166                         return errno;
4167                 }
4168                 return ENOENT;
4169         case NSS_STATUS_TRYAGAIN:
4170                 if (errno != 0) {
4171                         return errno;
4172                 }
4173                 return ERANGE;
4174         default:
4175                 if (errno != 0) {
4176                         return errno;
4177                 }
4178                 return ret;
4179         }
4180 }
4181
4182 static void nwrap_module_endgrent(struct nwrap_backend *b)
4183 {
4184         if (!b->fns->_nss_endgrent) {
4185                 return;
4186         }
4187
4188         b->fns->_nss_endgrent();
4189 }
4190
4191 /****************************************************************************
4192  *   GETPWNAM
4193  ***************************************************************************/
4194
4195 static struct passwd *nwrap_getpwnam(const char *name)
4196 {
4197         int i;
4198         struct passwd *pwd;
4199
4200         for (i=0; i < nwrap_main_global->num_backends; i++) {
4201                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4202                 pwd = b->ops->nw_getpwnam(b, name);
4203                 if (pwd) {
4204                         return pwd;
4205                 }
4206         }
4207
4208         return NULL;
4209 }
4210
4211 struct passwd *getpwnam(const char *name)
4212 {
4213         if (!nss_wrapper_enabled()) {
4214                 return libc_getpwnam(name);
4215         }
4216
4217         return nwrap_getpwnam(name);
4218 }
4219
4220 /****************************************************************************
4221  *   GETPWNAM_R
4222  ***************************************************************************/
4223
4224 static int nwrap_getpwnam_r(const char *name, struct passwd *pwdst,
4225                             char *buf, size_t buflen, struct passwd **pwdstp)
4226 {
4227         int i,ret;
4228
4229         for (i=0; i < nwrap_main_global->num_backends; i++) {
4230                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4231                 ret = b->ops->nw_getpwnam_r(b, name, pwdst, buf, buflen, pwdstp);
4232                 if (ret == ENOENT) {
4233                         continue;
4234                 }
4235                 return ret;
4236         }
4237
4238         return ENOENT;
4239 }
4240
4241 #ifdef HAVE_GETPWNAM_R
4242 # ifdef HAVE_SOLARIS_GETPWNAM_R
4243 int getpwnam_r(const char *name, struct passwd *pwdst,
4244                char *buf, int buflen, struct passwd **pwdstp)
4245 # else /* HAVE_SOLARIS_GETPWNAM_R */
4246 int getpwnam_r(const char *name, struct passwd *pwdst,
4247                char *buf, size_t buflen, struct passwd **pwdstp)
4248 # endif /* HAVE_SOLARIS_GETPWNAM_R */
4249 {
4250         if (!nss_wrapper_enabled()) {
4251                 return libc_getpwnam_r(name, pwdst, buf, buflen, pwdstp);
4252         }
4253
4254         return nwrap_getpwnam_r(name, pwdst, buf, buflen, pwdstp);
4255 }
4256 #endif
4257
4258 /****************************************************************************
4259  *   GETPWUID
4260  ***************************************************************************/
4261
4262 static struct passwd *nwrap_getpwuid(uid_t uid)
4263 {
4264         int i;
4265         struct passwd *pwd;
4266
4267         for (i=0; i < nwrap_main_global->num_backends; i++) {
4268                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4269                 pwd = b->ops->nw_getpwuid(b, uid);
4270                 if (pwd) {
4271                         return pwd;
4272                 }
4273         }
4274
4275         return NULL;
4276 }
4277
4278 struct passwd *getpwuid(uid_t uid)
4279 {
4280         if (!nss_wrapper_enabled()) {
4281                 return libc_getpwuid(uid);
4282         }
4283
4284         return nwrap_getpwuid(uid);
4285 }
4286
4287 /****************************************************************************
4288  *   GETPWUID_R
4289  ***************************************************************************/
4290
4291 static int nwrap_getpwuid_r(uid_t uid, struct passwd *pwdst,
4292                             char *buf, size_t buflen, struct passwd **pwdstp)
4293 {
4294         int i,ret;
4295
4296         for (i=0; i < nwrap_main_global->num_backends; i++) {
4297                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4298                 ret = b->ops->nw_getpwuid_r(b, uid, pwdst, buf, buflen, pwdstp);
4299                 if (ret == ENOENT) {
4300                         continue;
4301                 }
4302                 return ret;
4303         }
4304
4305         return ENOENT;
4306 }
4307
4308 #ifdef HAVE_SOLARIS_GETPWUID_R
4309 int getpwuid_r(uid_t uid, struct passwd *pwdst,
4310                char *buf, int buflen, struct passwd **pwdstp)
4311 #else
4312 int getpwuid_r(uid_t uid, struct passwd *pwdst,
4313                char *buf, size_t buflen, struct passwd **pwdstp)
4314 #endif
4315 {
4316         if (!nss_wrapper_enabled()) {
4317                 return libc_getpwuid_r(uid, pwdst, buf, buflen, pwdstp);
4318         }
4319
4320         return nwrap_getpwuid_r(uid, pwdst, buf, buflen, pwdstp);
4321 }
4322
4323 /****************************************************************************
4324  *   SETPWENT
4325  ***************************************************************************/
4326
4327 static void nwrap_setpwent(void)
4328 {
4329         int i;
4330
4331         for (i=0; i < nwrap_main_global->num_backends; i++) {
4332                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4333                 b->ops->nw_setpwent(b);
4334         }
4335 }
4336
4337 void setpwent(void)
4338 {
4339         if (!nss_wrapper_enabled()) {
4340                 libc_setpwent();
4341                 return;
4342         }
4343
4344         nwrap_setpwent();
4345 }
4346
4347 /****************************************************************************
4348  *   GETPWENT
4349  ***************************************************************************/
4350
4351 static struct passwd *nwrap_getpwent(void)
4352 {
4353         int i;
4354         struct passwd *pwd;
4355
4356         for (i=0; i < nwrap_main_global->num_backends; i++) {
4357                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4358                 pwd = b->ops->nw_getpwent(b);
4359                 if (pwd) {
4360                         return pwd;
4361                 }
4362         }
4363
4364         return NULL;
4365 }
4366
4367 struct passwd *getpwent(void)
4368 {
4369         if (!nss_wrapper_enabled()) {
4370                 return libc_getpwent();
4371         }
4372
4373         return nwrap_getpwent();
4374 }
4375
4376 /****************************************************************************
4377  *   GETPWENT_R
4378  ***************************************************************************/
4379
4380 static int nwrap_getpwent_r(struct passwd *pwdst, char *buf,
4381                             size_t buflen, struct passwd **pwdstp)
4382 {
4383         int i,ret;
4384
4385         for (i=0; i < nwrap_main_global->num_backends; i++) {
4386                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4387                 ret = b->ops->nw_getpwent_r(b, pwdst, buf, buflen, pwdstp);
4388                 if (ret == ENOENT) {
4389                         continue;
4390                 }
4391                 return ret;
4392         }
4393
4394         return ENOENT;
4395 }
4396
4397 #ifdef HAVE_SOLARIS_GETPWENT_R
4398 struct passwd *getpwent_r(struct passwd *pwdst, char *buf, int buflen)
4399 {
4400         struct passwd *pwdstp = NULL;
4401         int rc;
4402
4403         if (!nss_wrapper_enabled()) {
4404                 return libc_getpwent_r(pwdst, buf, buflen);
4405         }
4406         rc = nwrap_getpwent_r(pwdst, buf, buflen, &pwdstp);
4407         if (rc < 0) {
4408                 return NULL;
4409         }
4410
4411         return pwdstp;
4412 }
4413 #else /* HAVE_SOLARIS_GETPWENT_R */
4414 int getpwent_r(struct passwd *pwdst, char *buf,
4415                size_t buflen, struct passwd **pwdstp)
4416 {
4417         if (!nss_wrapper_enabled()) {
4418                 return libc_getpwent_r(pwdst, buf, buflen, pwdstp);
4419         }
4420
4421         return nwrap_getpwent_r(pwdst, buf, buflen, pwdstp);
4422 }
4423 #endif /* HAVE_SOLARIS_GETPWENT_R */
4424
4425 /****************************************************************************
4426  *   ENDPWENT
4427  ***************************************************************************/
4428
4429 static void nwrap_endpwent(void)
4430 {
4431         int i;
4432
4433         for (i=0; i < nwrap_main_global->num_backends; i++) {
4434                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4435                 b->ops->nw_endpwent(b);
4436         }
4437 }
4438
4439 void endpwent(void)
4440 {
4441         if (!nss_wrapper_enabled()) {
4442                 libc_endpwent();
4443                 return;
4444         }
4445
4446         nwrap_endpwent();
4447 }
4448
4449 /****************************************************************************
4450  *   INITGROUPS
4451  ***************************************************************************/
4452
4453 static int nwrap_initgroups(const char *user, gid_t group)
4454 {
4455         int i;
4456
4457         for (i=0; i < nwrap_main_global->num_backends; i++) {
4458                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4459                 int rc;
4460
4461                 rc = b->ops->nw_initgroups(b, user, group);
4462                 if (rc == 0) {
4463                         return 0;
4464                 }
4465         }
4466
4467         errno = ENOENT;
4468         return -1;
4469 }
4470
4471 int initgroups(const char *user, gid_t group)
4472 {
4473         if (!nss_wrapper_enabled()) {
4474                 return libc_initgroups(user, group);
4475         }
4476
4477         return nwrap_initgroups(user, group);
4478 }
4479
4480 /****************************************************************************
4481  *   GETGRNAM
4482  ***************************************************************************/
4483
4484 static struct group *nwrap_getgrnam(const char *name)
4485 {
4486         int i;
4487         struct group *grp;
4488
4489         for (i=0; i < nwrap_main_global->num_backends; i++) {
4490                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4491                 grp = b->ops->nw_getgrnam(b, name);
4492                 if (grp) {
4493                         return grp;
4494                 }
4495         }
4496
4497         return NULL;
4498 }
4499
4500 struct group *getgrnam(const char *name)
4501 {
4502         if (!nss_wrapper_enabled()) {
4503                 return libc_getgrnam(name);
4504         }
4505
4506         return nwrap_getgrnam(name);
4507 }
4508
4509 /****************************************************************************
4510  *   GETGRNAM_R
4511  ***************************************************************************/
4512
4513 static int nwrap_getgrnam_r(const char *name, struct group *grdst,
4514                             char *buf, size_t buflen, struct group **grdstp)
4515 {
4516         int i, ret;
4517
4518         for (i=0; i < nwrap_main_global->num_backends; i++) {
4519                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4520                 ret = b->ops->nw_getgrnam_r(b, name, grdst, buf, buflen, grdstp);
4521                 if (ret == ENOENT) {
4522                         continue;
4523                 }
4524                 return ret;
4525         }
4526
4527         return ENOENT;
4528 }
4529
4530 #ifdef HAVE_GETGRNAM_R
4531 # ifdef HAVE_SOLARIS_GETGRNAM_R
4532 int getgrnam_r(const char *name, struct group *grp,
4533                 char *buf, int buflen, struct group **pgrp)
4534 # else /* HAVE_SOLARIS_GETGRNAM_R */
4535 int getgrnam_r(const char *name, struct group *grp,
4536                char *buf, size_t buflen, struct group **pgrp)
4537 # endif /* HAVE_SOLARIS_GETGRNAM_R */
4538 {
4539         if (!nss_wrapper_enabled()) {
4540                 return libc_getgrnam_r(name,
4541                                        grp,
4542                                        buf,
4543                                        buflen,
4544                                        pgrp);
4545         }
4546
4547         return nwrap_getgrnam_r(name, grp, buf, buflen, pgrp);
4548 }
4549 #endif /* HAVE_GETGRNAM_R */
4550
4551 /****************************************************************************
4552  *   GETGRGID
4553  ***************************************************************************/
4554
4555 static struct group *nwrap_getgrgid(gid_t gid)
4556 {
4557         int i;
4558         struct group *grp;
4559
4560         for (i=0; i < nwrap_main_global->num_backends; i++) {
4561                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4562                 grp = b->ops->nw_getgrgid(b, gid);
4563                 if (grp) {
4564                         return grp;
4565                 }
4566         }
4567
4568         return NULL;
4569 }
4570
4571 struct group *getgrgid(gid_t gid)
4572 {
4573         if (!nss_wrapper_enabled()) {
4574                 return libc_getgrgid(gid);
4575         }
4576
4577         return nwrap_getgrgid(gid);
4578 }
4579
4580 /****************************************************************************
4581  *   GETGRGID_R
4582  ***************************************************************************/
4583
4584 static int nwrap_getgrgid_r(gid_t gid, struct group *grdst,
4585                             char *buf, size_t buflen, struct group **grdstp)
4586 {
4587         int i,ret;
4588
4589         for (i=0; i < nwrap_main_global->num_backends; i++) {
4590                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4591                 ret = b->ops->nw_getgrgid_r(b, gid, grdst, buf, buflen, grdstp);
4592                 if (ret == ENOENT) {
4593                         continue;
4594                 }
4595                 return ret;
4596         }
4597
4598         return ENOENT;
4599 }
4600
4601 #ifdef HAVE_GETGRGID_R
4602 # ifdef HAVE_SOLARIS_GETGRGID_R
4603 int getgrgid_r(gid_t gid, struct group *grdst,
4604                char *buf, int buflen, struct group **grdstp)
4605 # else /* HAVE_SOLARIS_GETGRGID_R */
4606 int getgrgid_r(gid_t gid, struct group *grdst,
4607                char *buf, size_t buflen, struct group **grdstp)
4608 # endif /* HAVE_SOLARIS_GETGRGID_R */
4609 {
4610         if (!nss_wrapper_enabled()) {
4611                 return libc_getgrgid_r(gid, grdst, buf, buflen, grdstp);
4612         }
4613
4614         return nwrap_getgrgid_r(gid, grdst, buf, buflen, grdstp);
4615 }
4616 #endif
4617
4618 /****************************************************************************
4619  *   SETGRENT
4620  ***************************************************************************/
4621
4622 static void nwrap_setgrent(void)
4623 {
4624         int i;
4625
4626         for (i=0; i < nwrap_main_global->num_backends; i++) {
4627                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4628                 b->ops->nw_setgrent(b);
4629         }
4630 }
4631
4632 #ifdef HAVE_BSD_SETGRENT
4633 int setgrent(void)
4634 #else
4635 void setgrent(void)
4636 #endif
4637 {
4638         if (!nss_wrapper_enabled()) {
4639                 libc_setgrent();
4640                 goto out;
4641         }
4642
4643         nwrap_setgrent();
4644
4645 out:
4646 #ifdef HAVE_BSD_SETGRENT
4647         return 0;
4648 #else
4649         return;
4650 #endif
4651 }
4652
4653 /****************************************************************************
4654  *   GETGRENT
4655  ***************************************************************************/
4656
4657 static struct group *nwrap_getgrent(void)
4658 {
4659         int i;
4660         struct group *grp;
4661
4662         for (i=0; i < nwrap_main_global->num_backends; i++) {
4663                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4664                 grp = b->ops->nw_getgrent(b);
4665                 if (grp) {
4666                         return grp;
4667                 }
4668         }
4669
4670         return NULL;
4671 }
4672
4673 struct group *getgrent(void)
4674 {
4675         if (!nss_wrapper_enabled()) {
4676                 return libc_getgrent();
4677         }
4678
4679         return nwrap_getgrent();
4680 }
4681
4682 /****************************************************************************
4683  *   GETGRENT_R
4684  ***************************************************************************/
4685
4686 static int nwrap_getgrent_r(struct group *grdst, char *buf,
4687                             size_t buflen, struct group **grdstp)
4688 {
4689         int i,ret;
4690
4691         for (i=0; i < nwrap_main_global->num_backends; i++) {
4692                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4693                 ret = b->ops->nw_getgrent_r(b, grdst, buf, buflen, grdstp);
4694                 if (ret == ENOENT) {
4695                         continue;
4696                 }
4697                 return ret;
4698         }
4699
4700         return ENOENT;
4701 }
4702
4703 #ifdef HAVE_SOLARIS_GETGRENT_R
4704 struct group *getgrent_r(struct group *src, char *buf, int buflen)
4705 {
4706         struct group *grdstp = NULL;
4707         int rc;
4708
4709         if (!nss_wrapper_enabled()) {
4710                 return libc_getgrent_r(src, buf, buflen);
4711         }
4712
4713         rc = nwrap_getgrent_r(src, buf, buflen, &grdstp);
4714         if (rc < 0) {
4715                 return NULL;
4716         }
4717
4718         return grdstp;
4719 }
4720 #else /* HAVE_SOLARIS_GETGRENT_R */
4721 int getgrent_r(struct group *src, char *buf,
4722                size_t buflen, struct group **grdstp)
4723 {
4724         if (!nss_wrapper_enabled()) {
4725                 return libc_getgrent_r(src, buf, buflen, grdstp);
4726         }
4727
4728         return nwrap_getgrent_r(src, buf, buflen, grdstp);
4729 }
4730 #endif /* HAVE_SOLARIS_GETGRENT_R */
4731
4732 /****************************************************************************
4733  *   ENDGRENT
4734  ***************************************************************************/
4735
4736 static void nwrap_endgrent(void)
4737 {
4738         int i;
4739
4740         for (i=0; i < nwrap_main_global->num_backends; i++) {
4741                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4742                 b->ops->nw_endgrent(b);
4743         }
4744 }
4745
4746 void endgrent(void)
4747 {
4748         if (!nss_wrapper_enabled()) {
4749                 libc_endgrent();
4750                 return;
4751         }
4752
4753         nwrap_endgrent();
4754 }
4755
4756 /****************************************************************************
4757  *   GETGROUPLIST
4758  ***************************************************************************/
4759
4760 #ifdef HAVE_GETGROUPLIST
4761 static int nwrap_getgrouplist(const char *user, gid_t group,
4762                               gid_t *groups, int *ngroups)
4763 {
4764         struct group *grp;
4765         gid_t *groups_tmp;
4766         int count = 1;
4767
4768         NWRAP_LOG(NWRAP_LOG_DEBUG, "getgrouplist called for %s", user);
4769
4770         groups_tmp = (gid_t *)malloc(count * sizeof(gid_t));
4771         if (!groups_tmp) {
4772                 NWRAP_LOG(NWRAP_LOG_ERROR, "Out of memory");
4773                 errno = ENOMEM;
4774                 return -1;
4775         }
4776         groups_tmp[0] = group;
4777
4778         nwrap_setgrent();
4779         while ((grp = nwrap_getgrent()) != NULL) {
4780                 int i = 0;
4781
4782                 NWRAP_LOG(NWRAP_LOG_DEBUG,
4783                           "Inspecting %s for group membership",
4784                           grp->gr_name);
4785
4786                 for (i=0; grp->gr_mem && grp->gr_mem[i] != NULL; i++) {
4787
4788                         if (group != grp->gr_gid &&
4789                             (strcmp(user, grp->gr_mem[i]) == 0)) {
4790
4791                                 NWRAP_LOG(NWRAP_LOG_DEBUG,
4792                                           "%s is member of %s",
4793                                           user,
4794                                           grp->gr_name);
4795
4796                                 groups_tmp = (gid_t *)realloc(groups_tmp, (count + 1) * sizeof(gid_t));
4797                                 if (!groups_tmp) {
4798                                         NWRAP_LOG(NWRAP_LOG_ERROR,
4799                                                   "Out of memory");
4800                                         errno = ENOMEM;
4801                                         return -1;
4802                                 }
4803                                 groups_tmp[count] = grp->gr_gid;
4804
4805                                 count++;
4806                         }
4807                 }
4808         }
4809
4810         nwrap_endgrent();
4811
4812         NWRAP_LOG(NWRAP_LOG_DEBUG,
4813                   "%s is member of %d groups",
4814                   user, *ngroups);
4815
4816         if (*ngroups < count) {
4817                 *ngroups = count;
4818                 free(groups_tmp);
4819                 return -1;
4820         }
4821
4822         *ngroups = count;
4823         memcpy(groups, groups_tmp, count * sizeof(gid_t));
4824         free(groups_tmp);
4825
4826         return count;
4827 }
4828
4829 int getgrouplist(const char *user, gid_t group, gid_t *groups, int *ngroups)
4830 {
4831         if (!nss_wrapper_enabled()) {
4832                 return libc_getgrouplist(user, group, groups, ngroups);
4833         }
4834
4835         return nwrap_getgrouplist(user, group, groups, ngroups);
4836 }
4837 #endif
4838
4839 /**********************************************************
4840  * SHADOW
4841  **********************************************************/
4842
4843 #if defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM)
4844
4845 #ifdef HAVE_SETSPENT
4846 static void nwrap_setspent(void)
4847 {
4848         nwrap_files_setspent();
4849 }
4850
4851 void setspent(void)
4852 {
4853         if (!nss_wrapper_shadow_enabled()) {
4854                 return;
4855         }
4856
4857         nwrap_setspent();
4858 }
4859
4860 static struct spwd *nwrap_getspent(void)
4861 {
4862         return nwrap_files_getspent();
4863 }
4864
4865 struct spwd *getspent(void)
4866 {
4867         if (!nss_wrapper_shadow_enabled()) {
4868                 return NULL;
4869         }
4870
4871         return nwrap_getspent();
4872 }
4873
4874 static void nwrap_endspent(void)
4875 {
4876         nwrap_files_endspent();
4877 }
4878
4879 void endspent(void)
4880 {
4881         if (!nss_wrapper_shadow_enabled()) {
4882                 return;
4883         }
4884
4885         nwrap_endspent();
4886 }
4887 #endif /* HAVE_SETSPENT */
4888
4889 static struct spwd *nwrap_getspnam(const char *name)
4890 {
4891         return nwrap_files_getspnam(name);
4892 }
4893
4894 struct spwd *getspnam(const char *name)
4895 {
4896         if (!nss_wrapper_shadow_enabled()) {
4897                 return NULL;
4898         }
4899
4900         return nwrap_getspnam(name);
4901 }
4902
4903 #endif /* defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM) */
4904
4905 /**********************************************************
4906  * NETDB
4907  **********************************************************/
4908
4909 static void nwrap_sethostent(int stayopen) {
4910         (void) stayopen; /* ignored */
4911
4912         nwrap_files_sethostent();
4913 }
4914
4915 #ifdef HAVE_SOLARIS_SETHOSTENT
4916 int sethostent(int stayopen)
4917 {
4918         if (!nss_wrapper_hosts_enabled()) {
4919                 libc_sethostent(stayopen);
4920                 return 0;
4921         }
4922
4923         nwrap_sethostent(stayopen);
4924
4925         return 0;
4926 }
4927 #else /* HAVE_SOLARIS_SETHOSTENT */
4928 void sethostent(int stayopen)
4929 {
4930         if (!nss_wrapper_hosts_enabled()) {
4931                 libc_sethostent(stayopen);
4932                 return;
4933         }
4934
4935         nwrap_sethostent(stayopen);
4936 }
4937 #endif /* HAVE_SOLARIS_SETHOSTENT */
4938
4939 static struct hostent *nwrap_gethostent(void)
4940 {
4941         return nwrap_files_gethostent();
4942 }
4943
4944 struct hostent *gethostent(void) {
4945         if (!nss_wrapper_hosts_enabled()) {
4946                 return libc_gethostent();
4947         }
4948
4949         return nwrap_gethostent();
4950 }
4951
4952 static void nwrap_endhostent(void) {
4953         nwrap_files_endhostent();
4954 }
4955
4956 #ifdef HAVE_SOLARIS_ENDHOSTENT
4957 int endhostent(void)
4958 {
4959         if (!nss_wrapper_hosts_enabled()) {
4960                 libc_endhostent();
4961                 return 0;
4962         }
4963
4964         nwrap_endhostent();
4965
4966         return 0;
4967 }
4968 #else /* HAVE_SOLARIS_ENDHOSTENT */
4969 void endhostent(void)
4970 {
4971         if (!nss_wrapper_hosts_enabled()) {
4972                 libc_endhostent();
4973                 return;
4974         }
4975
4976         nwrap_endhostent();
4977 }
4978 #endif /* HAVE_SOLARIS_ENDHOSTENT */
4979
4980 #ifdef BSD
4981 /* BSD implementation stores data in thread local storage but GLIBC does not */
4982 static __thread struct hostent user_he;
4983 static __thread struct nwrap_vector user_addrlist;
4984 #else
4985 static struct hostent user_he;
4986 static struct nwrap_vector user_addrlist;
4987 #endif /* BSD */
4988 static struct hostent *nwrap_gethostbyname(const char *name)
4989 {
4990         if (nwrap_files_gethostbyname(name, AF_UNSPEC, &user_he, &user_addrlist) == -1) {
4991                 return NULL;
4992         }
4993         return &user_he;
4994 }
4995
4996 struct hostent *gethostbyname(const char *name)
4997 {
4998         if (!nss_wrapper_hosts_enabled()) {
4999                 return libc_gethostbyname(name);
5000         }
5001
5002         return nwrap_gethostbyname(name);
5003 }
5004
5005 /* This is a GNU extension - Also can be found on BSD systems */
5006 #ifdef HAVE_GETHOSTBYNAME2
5007 #ifdef BSD
5008 /* BSD implementation stores data in  thread local storage but GLIBC not */
5009 static __thread struct hostent user_he2;
5010 static __thread struct nwrap_vector user_addrlist2;
5011 #else
5012 static struct hostent user_he2;
5013 static struct nwrap_vector user_addrlist2;
5014 #endif /* BSD */
5015 static struct hostent *nwrap_gethostbyname2(const char *name, int af)
5016 {
5017         if (nwrap_files_gethostbyname(name, af, &user_he2, &user_addrlist2) == -1) {
5018                 return NULL;
5019         }
5020         return &user_he2;
5021 }
5022
5023 struct hostent *gethostbyname2(const char *name, int af)
5024 {
5025         if (!nss_wrapper_hosts_enabled()) {
5026                 return libc_gethostbyname2(name, af);
5027         }
5028
5029         return nwrap_gethostbyname2(name, af);
5030 }
5031 #endif
5032
5033 static struct hostent *nwrap_gethostbyaddr(const void *addr,
5034                                            socklen_t len, int type)
5035 {
5036         return nwrap_files_gethostbyaddr(addr, len, type);
5037 }
5038
5039 struct hostent *gethostbyaddr(const void *addr,
5040                               socklen_t len, int type)
5041 {
5042         if (!nss_wrapper_hosts_enabled()) {
5043                 return libc_gethostbyaddr(addr, len, type);
5044         }
5045
5046         return nwrap_gethostbyaddr(addr, len, type);
5047 }
5048
5049 static const struct addrinfo default_hints =
5050 {
5051         .ai_flags = AI_ADDRCONFIG|AI_V4MAPPED,
5052         .ai_family = AF_UNSPEC,
5053         .ai_socktype = 0,
5054         .ai_protocol = 0,
5055         .ai_addrlen = 0,
5056         .ai_addr = NULL,
5057         .ai_canonname = NULL,
5058         .ai_next = NULL
5059 };
5060
5061 static int nwrap_convert_he_ai(const struct hostent *he,
5062                                unsigned short port,
5063                                const struct addrinfo *hints,
5064                                struct addrinfo **pai,
5065                                bool skip_canonname)
5066 {
5067         struct addrinfo *ai;
5068         socklen_t socklen;
5069
5070         if (he == NULL) {
5071                 return EAI_MEMORY;
5072         }
5073
5074         switch (he->h_addrtype) {
5075                 case AF_INET:
5076                         socklen = sizeof(struct sockaddr_in);
5077                         break;
5078 #ifdef HAVE_IPV6
5079                 case AF_INET6:
5080                         socklen = sizeof(struct sockaddr_in6);
5081                         break;
5082 #endif
5083                 default:
5084                         return EAI_FAMILY;
5085         }
5086
5087         ai = (struct addrinfo *)malloc(sizeof(struct addrinfo) + socklen);
5088         if (ai == NULL) {
5089                 return EAI_MEMORY;
5090         }
5091
5092         ai->ai_flags = hints->ai_flags;
5093         ai->ai_family = he->h_addrtype;
5094         ai->ai_socktype = hints->ai_socktype;
5095         ai->ai_protocol = hints->ai_protocol;
5096         ai->ai_canonname = NULL;
5097
5098         if (ai->ai_socktype == 0) {
5099                 ai->ai_socktype = SOCK_DGRAM;
5100         }
5101         if (ai->ai_protocol == 0) {
5102                 if (ai->ai_socktype == SOCK_DGRAM) {
5103                         ai->ai_protocol = IPPROTO_UDP;
5104                 } else if (ai->ai_socktype == SOCK_STREAM) {
5105                         ai->ai_protocol = IPPROTO_TCP;
5106                 }
5107         }
5108
5109         ai->ai_addrlen = socklen;
5110         ai->ai_addr = (void *)(ai + 1);
5111
5112 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
5113         ai->ai_addr->sa_len = socklen;
5114 #endif
5115         ai->ai_addr->sa_family = he->h_addrtype;
5116
5117         switch (he->h_addrtype) {
5118                 case AF_INET:
5119                 {
5120                         struct sockaddr_in *sinp =
5121                                 (struct sockaddr_in *) ai->ai_addr;
5122
5123                         memset(sinp, 0, sizeof(struct sockaddr_in));
5124
5125                         sinp->sin_port = htons(port);
5126                         sinp->sin_family = AF_INET;
5127
5128                         memset (sinp->sin_zero, '\0', sizeof (sinp->sin_zero));
5129                         memcpy(&sinp->sin_addr, he->h_addr_list[0], he->h_length);
5130
5131                 }
5132                 break;
5133 #ifdef HAVE_IPV6
5134                 case AF_INET6:
5135                 {
5136                         struct sockaddr_in6 *sin6p =
5137                                 (struct sockaddr_in6 *) ai->ai_addr;
5138
5139                         memset(sin6p, 0, sizeof(struct sockaddr_in6));
5140
5141                         sin6p->sin6_port = htons(port);
5142                         sin6p->sin6_family = AF_INET6;
5143
5144                         memcpy(&sin6p->sin6_addr,
5145                                he->h_addr_list[0],
5146                                he->h_length);
5147                 }
5148                 break;
5149 #endif
5150         }
5151
5152         ai->ai_next = NULL;
5153
5154         if (he->h_name && !skip_canonname) {
5155                 ai->ai_canonname = strdup(he->h_name);
5156                 if (ai->ai_canonname == NULL) {
5157                         freeaddrinfo(ai);
5158                         return EAI_MEMORY;
5159                 }
5160         }
5161
5162         *pai = ai;
5163         return 0;
5164 }
5165
5166 static int nwrap_getaddrinfo(const char *node,
5167                              const char *service,
5168                              const struct addrinfo *hints,
5169                              struct addrinfo **res)
5170 {
5171         struct addrinfo *ai = NULL;
5172         unsigned short port = 0;
5173         struct {
5174                 int family;
5175                 union {
5176                         struct in_addr v4;
5177 #ifdef HAVE_IPV6
5178                         struct in6_addr v6;
5179                 } in;
5180 #endif
5181         } addr = {
5182                 .family = AF_UNSPEC,
5183         };
5184         int rc;
5185
5186         if (node == NULL && service == NULL) {
5187                 return EAI_NONAME;
5188         }
5189
5190         if (hints == NULL) {
5191                 hints = &default_hints;
5192         }
5193
5194         /* EAI_BADFLAGS
5195               hints.ai_flags   contains   invalid  flags;  or,  hints.ai_flags
5196               included AI_CANONNAME and name was NULL.
5197         */
5198         if ((hints->ai_flags & AI_CANONNAME) && (node == NULL)) {
5199                 return EAI_BADFLAGS;
5200         }
5201
5202         /* If no node has been specified, let glibc deal with it */
5203         if (node == NULL) {
5204                 int ret;
5205                 struct addrinfo *p = NULL;
5206
5207                 ret = libc_getaddrinfo(node, service, hints, &p);
5208
5209                 if (ret == 0) {
5210                         *res = p;
5211                 }
5212                 return ret;
5213         }
5214
5215         if (service != NULL && service[0] != '\0') {
5216                 const char *proto = NULL;
5217                 struct servent *s;
5218                 char *end_ptr;
5219                 long sl;
5220
5221                 errno = 0;
5222                 sl = strtol(service, &end_ptr, 10);
5223
5224                 if (*end_ptr == '\0') {
5225                         port = sl;
5226                         goto valid_port;
5227                 } else if (hints->ai_flags & AI_NUMERICSERV) {
5228                         return EAI_NONAME;
5229                 }
5230
5231                 if (hints->ai_protocol != 0) {
5232                         struct protoent *pent;
5233
5234                         pent = getprotobynumber(hints->ai_protocol);
5235                         if (pent != NULL) {
5236                                 proto = pent->p_name;
5237                         }
5238                 }
5239
5240                 s = getservbyname(service, proto);
5241                 if (s == NULL) {
5242                         return EAI_NONAME;
5243                 }
5244                 port = ntohs(s->s_port);
5245         }
5246
5247 valid_port:
5248
5249         rc = inet_pton(AF_INET, node, &addr.in.v4);
5250         if (rc == 1) {
5251                 addr.family = AF_INET;
5252         }
5253 #ifdef HAVE_IPV6
5254         if (addr.family == AF_UNSPEC) {
5255                 rc = inet_pton(AF_INET6, node, &addr.in.v6);
5256                 if (rc == 1) {
5257                         addr.family = AF_INET6;
5258                 }
5259         }
5260 #endif
5261
5262         if (addr.family == AF_UNSPEC) {
5263                if (hints->ai_flags & AI_NUMERICHOST) {
5264                         return EAI_NONAME;
5265                 }
5266         } else if ((hints->ai_family != AF_UNSPEC) &&
5267                    (hints->ai_family != addr.family))
5268         {
5269                 return EAI_ADDRFAMILY;
5270         }
5271
5272         rc = nwrap_files_getaddrinfo(node, port, hints, &ai);
5273         if (rc != 0) {
5274                 int ret;
5275                 struct addrinfo *p = NULL;
5276
5277                 ret = libc_getaddrinfo(node, service, hints, &p);
5278
5279                 if (ret == 0) {
5280                         /*
5281                          * nwrap_files_getaddrinfo failed, but libc was
5282                          * successful -- use the result from libc.
5283                          */
5284                         *res = p;
5285                         return 0;
5286                 }
5287
5288                 return rc;
5289         }
5290
5291         /*
5292          * If the socktype was not specified, duplicate
5293          * each ai returned, so that we have variants for
5294          * both UDP and TCP.
5295          */
5296         if (hints->ai_socktype == 0) {
5297                 struct addrinfo *ai_cur;
5298
5299                 /* freeaddrinfo() frees ai_canonname and ai so allocate them */
5300                 for (ai_cur = ai; ai_cur != NULL; ai_cur = ai_cur->ai_next) {
5301                         struct addrinfo *ai_new;
5302
5303                         /* duplicate the current entry */
5304
5305                         ai_new = malloc(sizeof(struct addrinfo));
5306                         if (ai_new == NULL) {
5307                                 freeaddrinfo(ai);
5308                                 return EAI_MEMORY;
5309                         }
5310
5311                         memcpy(ai_new, ai_cur, sizeof(struct addrinfo));
5312                         ai_new->ai_next = NULL;
5313
5314                         /* We need a deep copy or freeaddrinfo() will blow up */
5315                         if (ai_cur->ai_canonname != NULL) {
5316                                 ai_new->ai_canonname =
5317                                         strdup(ai_cur->ai_canonname);
5318                         }
5319
5320                         if (ai_cur->ai_socktype == SOCK_DGRAM) {
5321                                 ai_new->ai_socktype = SOCK_STREAM;
5322                         } else if (ai_cur->ai_socktype == SOCK_STREAM) {
5323                                 ai_new->ai_socktype = SOCK_DGRAM;
5324                         }
5325                         if (ai_cur->ai_protocol == IPPROTO_TCP) {
5326                                 ai_new->ai_protocol = IPPROTO_UDP;
5327                         } else if (ai_cur->ai_protocol == IPPROTO_UDP) {
5328                                 ai_new->ai_protocol = IPPROTO_TCP;
5329                         }
5330
5331                         /* now insert the new entry */
5332
5333                         ai_new->ai_next = ai_cur->ai_next;
5334                         ai_cur->ai_next = ai_new;
5335
5336                         /* and move on (don't duplicate the new entry) */
5337
5338                         ai_cur = ai_new;
5339                 }
5340         }
5341
5342         *res = ai;
5343
5344         return 0;
5345 }
5346
5347 int getaddrinfo(const char *node, const char *service,
5348                 const struct addrinfo *hints,
5349                 struct addrinfo **res)
5350 {
5351         if (!nss_wrapper_hosts_enabled()) {
5352                 return libc_getaddrinfo(node, service, hints, res);
5353         }
5354
5355         return nwrap_getaddrinfo(node, service, hints, res);
5356 }
5357
5358 static int nwrap_getnameinfo(const struct sockaddr *sa, socklen_t salen,
5359                              char *host, size_t hostlen,
5360                              char *serv, size_t servlen,
5361                              int flags)
5362 {
5363         struct hostent *he;
5364         struct servent *service;
5365         const char *proto;
5366         const void *addr;
5367         socklen_t addrlen;
5368         uint16_t port;
5369         sa_family_t type;
5370
5371         if (sa == NULL || salen < sizeof(sa_family_t)) {
5372                 return EAI_FAMILY;
5373         }
5374
5375         if ((flags & NI_NAMEREQD) && host == NULL && serv == NULL) {
5376                 return EAI_NONAME;
5377         }
5378
5379         type = sa->sa_family;
5380         switch (type) {
5381         case AF_INET:
5382                 if (salen < sizeof(struct sockaddr_in))
5383                         return EAI_FAMILY;
5384                 addr = &((const struct sockaddr_in *)sa)->sin_addr;
5385                 addrlen = sizeof(((const struct sockaddr_in *)sa)->sin_addr);
5386                 port = ntohs(((const struct sockaddr_in *)sa)->sin_port);
5387                 break;
5388 #ifdef HAVE_IPV6
5389         case AF_INET6:
5390                 if (salen < sizeof(struct sockaddr_in6))
5391                         return EAI_FAMILY;
5392                 addr = &((const struct sockaddr_in6 *)sa)->sin6_addr;
5393                 addrlen = sizeof(((const struct sockaddr_in6 *)sa)->sin6_addr);
5394                 port = ntohs(((const struct sockaddr_in6 *)sa)->sin6_port);
5395                 break;
5396 #endif
5397         default:
5398                 return EAI_FAMILY;
5399         }
5400
5401         if (host != NULL) {
5402                 he = NULL;
5403                 if ((flags & NI_NUMERICHOST) == 0) {
5404                         he = nwrap_files_gethostbyaddr(addr, addrlen, type);
5405                         if ((flags & NI_NAMEREQD) && (he == NULL || he->h_name == NULL))
5406                                 return EAI_NONAME;
5407                 }
5408                 if (he != NULL && he->h_name != NULL) {
5409                         if (strlen(he->h_name) >= hostlen)
5410                                 return EAI_OVERFLOW;
5411                         strcpy(host, he->h_name);
5412                         if (flags & NI_NOFQDN)
5413                                 host[strcspn(host, ".")] = '\0';
5414                 } else {
5415                         if (inet_ntop(type, addr, host, hostlen) == NULL)
5416                                 return (errno == ENOSPC) ? EAI_OVERFLOW : EAI_FAIL;
5417                 }
5418         }
5419
5420         if (serv != NULL) {
5421                 service = NULL;
5422                 if ((flags & NI_NUMERICSERV) == 0) {
5423                         proto = (flags & NI_DGRAM) ? "udp" : "tcp";
5424                         service = getservbyport(htons(port), proto);
5425                 }
5426                 if (service != NULL) {
5427                         if (strlen(service->s_name) >= servlen)
5428                                 return EAI_OVERFLOW;
5429                         strcpy(serv, service->s_name);
5430                 } else {
5431                         if (snprintf(serv, servlen, "%u", port) >= (int) servlen)
5432                                 return EAI_OVERFLOW;
5433                 }
5434         }
5435
5436         return 0;
5437 }
5438
5439 #ifdef HAVE_LINUX_GETNAMEINFO
5440 int getnameinfo(const struct sockaddr *sa, socklen_t salen,
5441                 char *host, socklen_t hostlen,
5442                 char *serv, socklen_t servlen,
5443                 int flags)
5444 #elif defined(HAVE_LINUX_GETNAMEINFO_UNSIGNED)
5445 int getnameinfo(const struct sockaddr *sa, socklen_t salen,
5446                 char *host, socklen_t hostlen,
5447                 char *serv, socklen_t servlen,
5448                 unsigned int flags)
5449 #else
5450 int getnameinfo(const struct sockaddr *sa, socklen_t salen,
5451                 char *host, size_t hostlen,
5452                 char *serv, size_t servlen,
5453                 int flags)
5454 #endif
5455 {
5456         if (!nss_wrapper_hosts_enabled()) {
5457                 return libc_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
5458         }
5459
5460         return nwrap_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
5461 }
5462
5463 static int nwrap_gethostname(char *name, size_t len)
5464 {
5465         const char *hostname = getenv("NSS_WRAPPER_HOSTNAME");
5466
5467         if (strlen(hostname) >= len) {
5468                 errno = ENAMETOOLONG;
5469                 return -1;
5470         }
5471         snprintf(name, len, "%s", hostname);
5472
5473         return 0;
5474 }
5475
5476 #ifdef HAVE_SOLARIS_GETHOSTNAME
5477 int gethostname(char *name, int len)
5478 #else /* HAVE_SOLARIS_GETHOSTNAME */
5479 int gethostname(char *name, size_t len)
5480 #endif /* HAVE_SOLARIS_GETHOSTNAME */
5481 {
5482         if (!nwrap_hostname_enabled()) {
5483                 return libc_gethostname(name, len);
5484         }
5485
5486         return nwrap_gethostname(name, len);
5487 }
5488
5489 /****************************
5490  * DESTRUCTOR
5491  ***************************/
5492
5493 /*
5494  * This function is called when the library is unloaded and makes sure that
5495  * sockets get closed and the unix file for the socket are unlinked.
5496  */
5497 void nwrap_destructor(void)
5498 {
5499         int i;
5500
5501         NWRAP_LOCK_ALL;
5502         if (nwrap_main_global != NULL) {
5503                 struct nwrap_main *m = nwrap_main_global;
5504
5505                 /* libc */
5506                 SAFE_FREE(m->libc->fns);
5507                 if (m->libc->handle != NULL) {
5508                         dlclose(m->libc->handle);
5509                 }
5510                 if (m->libc->nsl_handle != NULL) {
5511                         dlclose(m->libc->nsl_handle);
5512                 }
5513                 if (m->libc->sock_handle != NULL) {
5514                         dlclose(m->libc->sock_handle);
5515                 }
5516                 SAFE_FREE(m->libc);
5517
5518                 /* backends */
5519                 for (i = 0; i < m->num_backends; i++) {
5520                         struct nwrap_backend *b = &(m->backends[i]);
5521
5522                         if (b->so_handle != NULL) {
5523                                 dlclose(b->so_handle);
5524                         }
5525                         SAFE_FREE(b->fns);
5526                 }
5527                 SAFE_FREE(m->backends);
5528         }
5529
5530         if (nwrap_pw_global.cache != NULL) {
5531                 struct nwrap_cache *c = nwrap_pw_global.cache;
5532
5533                 nwrap_files_cache_unload(c);
5534                 if (c->fd >= 0) {
5535                         fclose(c->fp);
5536                         c->fd = -1;
5537                 }
5538
5539                 SAFE_FREE(nwrap_pw_global.list);
5540                 nwrap_pw_global.num = 0;
5541         }
5542
5543         if (nwrap_gr_global.cache != NULL) {
5544                 struct nwrap_cache *c = nwrap_gr_global.cache;
5545
5546                 nwrap_files_cache_unload(c);
5547                 if (c->fd >= 0) {
5548                         fclose(c->fp);
5549                         c->fd = -1;
5550                 }
5551
5552                 SAFE_FREE(nwrap_gr_global.list);
5553                 nwrap_pw_global.num = 0;
5554         }
5555
5556 #if defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM)
5557         if (nwrap_sp_global.cache != NULL) {
5558                 struct nwrap_cache *c = nwrap_sp_global.cache;
5559
5560                 nwrap_files_cache_unload(c);
5561                 if (c->fd >= 0) {
5562                         fclose(c->fp);
5563                         c->fd = -1;
5564                 }
5565
5566                 nwrap_sp_global.num = 0;
5567         }
5568 #endif /* defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM) */
5569
5570         if (nwrap_he_global.cache != NULL) {
5571                 struct nwrap_cache *c = nwrap_he_global.cache;
5572
5573                 nwrap_files_cache_unload(c);
5574                 if (c->fd >= 0) {
5575                         fclose(c->fp);
5576                         c->fd = -1;
5577                 }
5578
5579                 nwrap_he_global.num = 0;
5580         }
5581
5582         free(user_addrlist.items);
5583 #ifdef HAVE_GETHOSTBYNAME2
5584         free(user_addrlist2.items);
5585 #endif
5586
5587         hdestroy();
5588         NWRAP_UNLOCK_ALL;
5589 }