nsswitch/wins.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    a WINS nsswitch module
   4    Copyright (C) Andrew Tridgell 1999
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 */
  20
  21 #include "includes.h"
  22 #include "nsswitch/winbind_nss.h"
  23 #include "nsswitch/libwbclient/wbclient.h"
  24
  25 #ifdef HAVE_NS_API_H
  26
  27 #include <ns_daemon.h>
  28 #endif
  29
  30 #if HAVE_PTHREAD_H
  31 #include <pthread.h>
  32 #endif
  33
  34 #if HAVE_PTHREAD
  35 static pthread_mutex_t wins_nss_mutex = PTHREAD_MUTEX_INITIALIZER;
  36 #endif
  37
  38 #ifndef INADDRSZ
  39 #define INADDRSZ 4
  40 #endif
  41
  42 NSS_STATUS _nss_wins_gethostbyname_r(const char *hostname, struct hostent *he,
  43                           char *buffer, size_t buflen, int *h_errnop);
  44 NSS_STATUS _nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he,
  45                            char *buffer, size_t buflen, int *h_errnop);
  46
  47 static char *lookup_byname_backend(const char *name)
  48 {
  49         const char *p;
  50         char *ip;
  51         size_t nbt_len;
  52         wbcErr result;
  53
  54         nbt_len = strlen(name);
  55         if (nbt_len > MAX_NETBIOSNAME_LEN - 1) {
  56                 return NULL;
  57         }
  58         p = strchr(name, '.');
  59         if (p != NULL) {
  60                 return NULL;
  61         }
  62
  63         result = wbcResolveWinsByName(name, &ip);
  64         if (result != WBC_ERR_SUCCESS) {
  65                 return NULL;
  66         }
  67
  68         return ip;
  69 }
  70
  71 #ifdef HAVE_NS_API_H
  72
  73 static char *lookup_byaddr_backend(const char *ip)
  74 {
  75         wbcErr result;
  76         char *name = NULL;
  77
  78         result = wbcResolveWinsByIP(ip, &name);
  79         if (result != WBC_ERR_SUCCESS) {
  80                 return NULL;
  81         }
  82
  83         return name;
  84 }
  85
  86 /* IRIX version */
  87
  88 int init(void)
  89 {
  90         bool ok;
  91
  92         nsd_logprintf(NSD_LOG_MIN, "entering init (wins)\n");
  93
  94         ok = nss_wins_init();
  95         if (!ok) {
  96                 return NSD_ERROR;
  97         }
  98
  99         return NSD_OK;
 100 }
 101
 102 int lookup(nsd_file_t *rq)
 103 {
 104         char *map;
 105         char *key;
 106         char *addr;
 107         int i, count, len, size;
 108         char response[1024];
 109         bool found = False;
 110
 111         nsd_logprintf(NSD_LOG_MIN, "entering lookup (wins)\n");
 112         if (! rq)
 113                 return NSD_ERROR;
 114
 115         map = nsd_attr_fetch_string(rq->f_attrs, "table", (char*)0);
 116         if (! map) {
 117                 rq->f_status = NS_FATAL;
 118                 return NSD_ERROR;
 119         }
 120
 121         key = nsd_attr_fetch_string(rq->f_attrs, "key", (char*)0);
 122         if (! key || ! *key) {
 123                 rq->f_status = NS_FATAL;
 124                 return NSD_ERROR;
 125         }
 126
 127         response[0] = '\0';
 128         len = sizeof(response) - 2;
 129
 130         /*
 131          * response needs to be a string of the following format
 132          * ip_address[ ip_address]*\tname[ alias]*
 133          */
 134         if (strcasecmp_m(map,"hosts.byaddr") == 0) {
 135                 char *name;
 136
 137                 name = lookup_byaddr_backend(key);
 138                 if (name != NULL) {
 139                         size = strlen(key) + 1;
 140                         if (size > len) {
 141                                 return NSD_ERROR;
 142                         }
 143                         len -= size;
 144                         strncat(response,key,size);
 145                         strncat(response,"\t",1);
 146
 147                         size = strlen(name) + 1;
 148                         if (size > len) {
 149                                 return NSD_ERROR;
 150                         }
 151                         len -= size;
 152                         strncat(response, name, size);
 153                         strncat(response, " ", 1);
 154                         found = True;
 155                 }
 156                 response[strlen(response)-1] = '\n';
 157         } else if (strcasecmp_m(map,"hosts.byname") == 0) {
 158                 char *ip;
 159
 160                 ip = lookup_byname_backend(key);
 161                 if (ip != NULL) {
 162                         size = strlen(ip) + 1;
 163                         if (size > len) {
 164                                 wbcFreeMemory(ip);
 165                                 return NSD_ERROR;
 166                         }
 167                         len -= size;
 168                         strncat(response,ip,size);
 169                         strncat(response,"\t",1);
 170                         size = strlen(key) + 1;
 171                         wbcFreeMemory(ip);
 172                         if (size > len) {
 173                                 return NSD_ERROR;
 174                         }
 175                         strncat(response,key,size);
 176                         strncat(response,"\n",1);
 177
 178                         found = True;
 179                 }
 180         }
 181
 182         if (found) {
 183             nsd_logprintf(NSD_LOG_LOW, "lookup (wins %s) %s\n",map,response);
 184             nsd_set_result(rq,NS_SUCCESS,response,strlen(response),VOLATILE);
 185             return NSD_OK;
 186         }
 187         nsd_logprintf(NSD_LOG_LOW, "lookup (wins) not found\n");
 188         rq->f_status = NS_NOTFOUND;
 189         return NSD_NEXT;
 190 }
 191
 192 #else
 193
 194 /* Allocate some space from the nss static buffer.  The buffer and buflen
 195    are the pointers passed in by the C library to the _nss_*_*
 196    functions. */
 197
 198 static char *get_static(char **buffer, size_t *buflen, size_t len)
 199 {
 200         char *result;
 201
 202         /* Error check.  We return false if things aren't set up right, or
 203            there isn't enough buffer space left. */
 204
 205         if ((buffer == NULL) || (buflen == NULL) || (*buflen < len)) {
 206                 return NULL;
 207         }
 208
 209         /* Return an index into the static buffer */
 210
 211         result = *buffer;
 212         *buffer += len;
 213         *buflen -= len;
 214
 215         return result;
 216 }
 217
 218 /****************************************************************************
 219 gethostbyname() - we ignore any domain portion of the name and only
 220 handle names that are at most 15 characters long
 221   **************************************************************************/
 222 NSS_STATUS
 223 _nss_wins_gethostbyname_r(const char *hostname, struct hostent *he,
 224                           char *buffer, size_t buflen, int *h_errnop)
 225 {
 226         NSS_STATUS nss_status = NSS_STATUS_SUCCESS;
 227         char *ip;
 228         struct in_addr in;
 229         int i;
 230         fstring name;
 231         size_t namelen;
 232         int rc;
 233
 234 #if HAVE_PTHREAD
 235         pthread_mutex_lock(&wins_nss_mutex);
 236 #endif
 237
 238         memset(he, '\0', sizeof(*he));
 239         fstrcpy(name, hostname);
 240
 241         /* Do lookup */
 242
 243         ip = lookup_byname_backend(name);
 244         if (ip == NULL) {
 245                 nss_status = NSS_STATUS_NOTFOUND;
 246                 goto out;
 247         }
 248
 249         rc = inet_pton(AF_INET, ip, &in);
 250         wbcFreeMemory(ip);
 251         if (rc == 0) {
 252                 nss_status = NSS_STATUS_TRYAGAIN;
 253                 goto out;
 254         }
 255
 256         /* Copy h_name */
 257
 258         namelen = strlen(name) + 1;
 259
 260         if ((he->h_name = get_static(&buffer, &buflen, namelen)) == NULL) {
 261                 nss_status = NSS_STATUS_TRYAGAIN;
 262                 goto out;
 263         }
 264
 265         memcpy(he->h_name, name, namelen);
 266
 267         /* Copy h_addr_list, align to pointer boundary first */
 268
 269         if ((i = (unsigned long)(buffer) % sizeof(char*)) != 0)
 270                 i = sizeof(char*) - i;
 271
 272         if (get_static(&buffer, &buflen, i) == NULL) {
 273                 nss_status = NSS_STATUS_TRYAGAIN;
 274                 goto out;
 275         }
 276
 277         if ((he->h_addr_list = (char **)get_static(
 278                      &buffer, &buflen, i * sizeof(char *))) == NULL) {
 279                 nss_status = NSS_STATUS_TRYAGAIN;
 280                 goto out;
 281         }
 282
 283         if ((he->h_addr_list[0] = get_static(&buffer, &buflen,
 284                                              INADDRSZ)) == NULL) {
 285                 nss_status = NSS_STATUS_TRYAGAIN;
 286                 goto out;
 287         }
 288
 289         memcpy(he->h_addr_list[i], &in, INADDRSZ);
 290
 291         he->h_addr_list[0] = NULL;
 292
 293         /* Set h_addr_type and h_length */
 294
 295         he->h_addrtype = AF_INET;
 296         he->h_length = INADDRSZ;
 297
 298         /* Set h_aliases */
 299
 300         if ((i = (unsigned long)(buffer) % sizeof(char*)) != 0)
 301                 i = sizeof(char*) - i;
 302
 303         if (get_static(&buffer, &buflen, i) == NULL) {
 304                 nss_status = NSS_STATUS_TRYAGAIN;
 305                 goto out;
 306         }
 307
 308         if ((he->h_aliases = (char **)get_static(
 309                      &buffer, &buflen, sizeof(char *))) == NULL) {
 310                 nss_status = NSS_STATUS_TRYAGAIN;
 311                 goto out;
 312         }
 313
 314         he->h_aliases[0] = NULL;
 315
 316         nss_status = NSS_STATUS_SUCCESS;
 317
 318   out:
 319
 320 #if HAVE_PTHREAD
 321         pthread_mutex_unlock(&wins_nss_mutex);
 322 #endif
 323         return nss_status;
 324 }
 325
 326
 327 NSS_STATUS
 328 _nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he,
 329                            char *buffer, size_t buflen, int *h_errnop)
 330 {
 331         NSS_STATUS nss_status;
 332
 333         if(af!=AF_INET) {
 334                 *h_errnop = NO_DATA;
 335                 nss_status = NSS_STATUS_UNAVAIL;
 336         } else {
 337                 nss_status = _nss_wins_gethostbyname_r(
 338                                 name, he, buffer, buflen, h_errnop);
 339         }
 340         return nss_status;
 341 }
 342 #endif