source3/winbindd/winbindd.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind daemon for ntdom nss module
   5
   6    Copyright (C) by Tim Potter 2000-2002
   7    Copyright (C) Andrew Tridgell 2002
   8    Copyright (C) Jelmer Vernooij 2003
   9    Copyright (C) Volker Lendecke 2004
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "popt_common.h"
  27 #include "winbindd.h"
  28 #include "nsswitch/winbind_client.h"
  29 #include "nsswitch/wb_reqtrans.h"
  30 #include "ntdomain.h"
  31 #include "../librpc/gen_ndr/srv_lsa.h"
  32 #include "../librpc/gen_ndr/srv_samr.h"
  33 #include "secrets.h"
  34 #include "rpc_client/cli_netlogon.h"
  35 #include "idmap.h"
  36 #include "lib/addrchange.h"
  37 #include "auth.h"
  38 #include "messages.h"
  39 #include "../lib/util/pidfile.h"
  40 #include "util_cluster.h"
  41 #include "source4/lib/messaging/irpc.h"
  42 #include "source4/lib/messaging/messaging.h"
  43 #include "lib/param/param.h"
  44 #include "lib/async_req/async_sock.h"
  45 #include "libsmb/samlogon_cache.h"
  46 #include "libcli/auth/netlogon_creds_cli.h"
  47
  48 #undef DBGC_CLASS
  49 #define DBGC_CLASS DBGC_WINBIND
  50
  51 #define SCRUB_CLIENTS_INTERVAL 5
  52
  53 static bool client_is_idle(struct winbindd_cli_state *state);
  54 static void remove_client(struct winbindd_cli_state *state);
  55 static void winbindd_setup_max_fds(void);
  56
  57 static bool opt_nocache = False;
  58 static bool interactive = False;
  59
  60 extern bool override_logfile;
  61
  62 struct imessaging_context *winbind_imessaging_context(void)
  63 {
  64         static struct imessaging_context *msg = NULL;
  65         struct messaging_context *msg_ctx;
  66         struct server_id myself;
  67         struct loadparm_context *lp_ctx;
  68
  69         if (msg != NULL) {
  70                 return msg;
  71         }
  72
  73         msg_ctx = server_messaging_context();
  74         if (msg_ctx == NULL) {
  75                 smb_panic("server_messaging_context failed\n");
  76         }
  77         myself = messaging_server_id(msg_ctx);
  78
  79         lp_ctx = loadparm_init_s3(NULL, loadparm_s3_helpers());
  80         if (lp_ctx == NULL) {
  81                 smb_panic("Could not load smb.conf to init winbindd's imessaging context.\n");
  82         }
  83
  84         /*
  85          * Note we MUST use the NULL context here, not the autofree context,
  86          * to avoid side effects in forked children exiting.
  87          */
  88         msg = imessaging_init(NULL, lp_ctx, myself, server_event_context());
  89         talloc_unlink(NULL, lp_ctx);
  90
  91         if (msg == NULL) {
  92                 smb_panic("Could not init winbindd's messaging context.\n");
  93         }
  94         return msg;
  95 }
  96
  97 /* Reload configuration */
  98
  99 static bool reload_services_file(const char *lfile)
 100 {
 101         bool ret;
 102
 103         if (lp_loaded()) {
 104                 char *fname = lp_next_configfile(talloc_tos());
 105
 106                 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
 107                         set_dyn_CONFIGFILE(fname);
 108                 }
 109                 TALLOC_FREE(fname);
 110         }
 111
 112         /* if this is a child, restore the logfile to the special
 113            name - <domain>, idmap, etc. */
 114         if (lfile && *lfile) {
 115                 lp_set_logfile(lfile);
 116         }
 117
 118         reopen_logs();
 119         ret = lp_load_global(get_dyn_CONFIGFILE());
 120
 121         reopen_logs();
 122         load_interfaces();
 123         winbindd_setup_max_fds();
 124
 125         return(ret);
 126 }
 127
 128
 129 static void winbindd_status(void)
 130 {
 131         struct winbindd_cli_state *tmp;
 132
 133         DEBUG(0, ("winbindd status:\n"));
 134
 135         /* Print client state information */
 136
 137         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
 138
 139         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
 140                 DEBUG(2, ("\tclient list:\n"));
 141                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
 142                         DEBUGADD(2, ("\t\tpid %lu, sock %d (%s)\n",
 143                                      (unsigned long)tmp->pid, tmp->sock,
 144                                      client_is_idle(tmp) ? "idle" : "active"));
 145                 }
 146         }
 147 }
 148
 149 /* Flush client cache */
 150
 151 static void flush_caches(void)
 152 {
 153         /* We need to invalidate cached user list entries on a SIGHUP
 154            otherwise cached access denied errors due to restrict anonymous
 155            hang around until the sequence number changes. */
 156
 157         if (!wcache_invalidate_cache()) {
 158                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 159                 if (!winbindd_cache_validate_and_initialize()) {
 160                         exit(1);
 161                 }
 162         }
 163 }
 164
 165 static void flush_caches_noinit(void)
 166 {
 167         /*
 168          * We need to invalidate cached user list entries on a SIGHUP
 169          * otherwise cached access denied errors due to restrict anonymous
 170          * hang around until the sequence number changes.
 171          * NB
 172          * Skip uninitialized domains when flush cache.
 173          * If domain is not initialized, it means it is never
 174          * used or never become online. look, wcache_invalidate_cache()
 175          * -> get_cache() -> init_dc_connection(). It causes a lot of traffic
 176          * for unused domains and large traffic for primay domain's DC if there
 177          * are many domains..
 178          */
 179
 180         if (!wcache_invalidate_cache_noinit()) {
 181                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 182                 if (!winbindd_cache_validate_and_initialize()) {
 183                         exit(1);
 184                 }
 185         }
 186 }
 187
 188 /* Handle the signal by unlinking socket and exiting */
 189
 190 static void terminate(bool is_parent)
 191 {
 192         if (is_parent) {
 193                 /* When parent goes away we should
 194                  * remove the socket file. Not so
 195                  * when children terminate.
 196                  */
 197                 char *path = NULL;
 198
 199                 if (asprintf(&path, "%s/%s",
 200                         lp_winbindd_socket_directory(), WINBINDD_SOCKET_NAME) > 0) {
 201                         unlink(path);
 202                         SAFE_FREE(path);
 203                 }
 204         }
 205
 206         idmap_close();
 207
 208         gencache_stabilize();
 209
 210         netlogon_creds_cli_close_global_db();
 211
 212 #if 0
 213         if (interactive) {
 214                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 215                 char *description = talloc_describe_all(mem_ctx);
 216
 217                 DEBUG(3, ("tallocs left:\n%s\n", description));
 218                 talloc_destroy(mem_ctx);
 219         }
 220 #endif
 221
 222         if (is_parent) {
 223                 pidfile_unlink(lp_pid_directory(), "winbindd");
 224         }
 225
 226         exit(0);
 227 }
 228
 229 static void winbindd_sig_term_handler(struct tevent_context *ev,
 230                                       struct tevent_signal *se,
 231                                       int signum,
 232                                       int count,
 233                                       void *siginfo,
 234                                       void *private_data)
 235 {
 236         bool *p = talloc_get_type_abort(private_data, bool);
 237         bool is_parent = *p;
 238
 239         TALLOC_FREE(p);
 240
 241         DEBUG(0,("Got sig[%d] terminate (is_parent=%d)\n",
 242                  signum, is_parent));
 243         terminate(is_parent);
 244 }
 245
 246 /*
 247   handle stdin becoming readable when we are in --foreground mode
 248  */
 249 static void winbindd_stdin_handler(struct tevent_context *ev,
 250                                struct tevent_fd *fde,
 251                                uint16_t flags,
 252                                void *private_data)
 253 {
 254         char c;
 255         if (read(0, &c, 1) != 1) {
 256                 bool *is_parent = talloc_get_type_abort(private_data, bool);
 257
 258                 /* we have reached EOF on stdin, which means the
 259                    parent has exited. Shutdown the server */
 260                 DEBUG(0,("EOF on stdin (is_parent=%d)\n",
 261                          (int)*is_parent));
 262                 terminate(*is_parent);
 263         }
 264 }
 265
 266 bool winbindd_setup_sig_term_handler(bool parent)
 267 {
 268         struct tevent_signal *se;
 269         bool *is_parent;
 270
 271         is_parent = talloc(server_event_context(), bool);
 272         if (!is_parent) {
 273                 return false;
 274         }
 275
 276         *is_parent = parent;
 277
 278         se = tevent_add_signal(server_event_context(),
 279                                is_parent,
 280                                SIGTERM, 0,
 281                                winbindd_sig_term_handler,
 282                                is_parent);
 283         if (!se) {
 284                 DEBUG(0,("failed to setup SIGTERM handler"));
 285                 talloc_free(is_parent);
 286                 return false;
 287         }
 288
 289         se = tevent_add_signal(server_event_context(),
 290                                is_parent,
 291                                SIGINT, 0,
 292                                winbindd_sig_term_handler,
 293                                is_parent);
 294         if (!se) {
 295                 DEBUG(0,("failed to setup SIGINT handler"));
 296                 talloc_free(is_parent);
 297                 return false;
 298         }
 299
 300         se = tevent_add_signal(server_event_context(),
 301                                is_parent,
 302                                SIGQUIT, 0,
 303                                winbindd_sig_term_handler,
 304                                is_parent);
 305         if (!se) {
 306                 DEBUG(0,("failed to setup SIGINT handler"));
 307                 talloc_free(is_parent);
 308                 return false;
 309         }
 310
 311         return true;
 312 }
 313
 314 bool winbindd_setup_stdin_handler(bool parent, bool foreground)
 315 {
 316         bool *is_parent;
 317
 318         if (foreground) {
 319                 struct stat st;
 320
 321                 is_parent = talloc(server_event_context(), bool);
 322                 if (!is_parent) {
 323                         return false;
 324                 }
 325
 326                 *is_parent = parent;
 327
 328                 /* if we are running in the foreground then look for
 329                    EOF on stdin, and exit if it happens. This allows
 330                    us to die if the parent process dies
 331                    Only do this on a pipe or socket, no other device.
 332                 */
 333                 if (fstat(0, &st) != 0) {
 334                         return false;
 335                 }
 336                 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode)) {
 337                         tevent_add_fd(server_event_context(),
 338                                         is_parent,
 339                                         0,
 340                                         TEVENT_FD_READ,
 341                                         winbindd_stdin_handler,
 342                                         is_parent);
 343                 }
 344         }
 345
 346         return true;
 347 }
 348
 349 static void winbindd_sig_hup_handler(struct tevent_context *ev,
 350                                      struct tevent_signal *se,
 351                                      int signum,
 352                                      int count,
 353                                      void *siginfo,
 354                                      void *private_data)
 355 {
 356         const char *file = (const char *)private_data;
 357
 358         DEBUG(1,("Reloading services after SIGHUP\n"));
 359         flush_caches_noinit();
 360         reload_services_file(file);
 361 }
 362
 363 bool winbindd_setup_sig_hup_handler(const char *lfile)
 364 {
 365         struct tevent_signal *se;
 366         char *file = NULL;
 367
 368         if (lfile) {
 369                 file = talloc_strdup(server_event_context(),
 370                                      lfile);
 371                 if (!file) {
 372                         return false;
 373                 }
 374         }
 375
 376         se = tevent_add_signal(server_event_context(),
 377                                server_event_context(),
 378                                SIGHUP, 0,
 379                                winbindd_sig_hup_handler,
 380                                file);
 381         if (!se) {
 382                 return false;
 383         }
 384
 385         return true;
 386 }
 387
 388 static void winbindd_sig_chld_handler(struct tevent_context *ev,
 389                                       struct tevent_signal *se,
 390                                       int signum,
 391                                       int count,
 392                                       void *siginfo,
 393                                       void *private_data)
 394 {
 395         pid_t pid;
 396
 397         while ((pid = waitpid(-1, NULL, WNOHANG)) > 0) {
 398                 winbind_child_died(pid);
 399         }
 400 }
 401
 402 static bool winbindd_setup_sig_chld_handler(void)
 403 {
 404         struct tevent_signal *se;
 405
 406         se = tevent_add_signal(server_event_context(),
 407                                server_event_context(),
 408                                SIGCHLD, 0,
 409                                winbindd_sig_chld_handler,
 410                                NULL);
 411         if (!se) {
 412                 return false;
 413         }
 414
 415         return true;
 416 }
 417
 418 static void winbindd_sig_usr2_handler(struct tevent_context *ev,
 419                                       struct tevent_signal *se,
 420                                       int signum,
 421                                       int count,
 422                                       void *siginfo,
 423                                       void *private_data)
 424 {
 425         winbindd_status();
 426 }
 427
 428 static bool winbindd_setup_sig_usr2_handler(void)
 429 {
 430         struct tevent_signal *se;
 431
 432         se = tevent_add_signal(server_event_context(),
 433                                server_event_context(),
 434                                SIGUSR2, 0,
 435                                winbindd_sig_usr2_handler,
 436                                NULL);
 437         if (!se) {
 438                 return false;
 439         }
 440
 441         return true;
 442 }
 443
 444 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 445 static void msg_reload_services(struct messaging_context *msg,
 446                                 void *private_data,
 447                                 uint32_t msg_type,
 448                                 struct server_id server_id,
 449                                 DATA_BLOB *data)
 450 {
 451         /* Flush various caches */
 452         flush_caches();
 453         reload_services_file((const char *) private_data);
 454 }
 455
 456 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 457 static void msg_shutdown(struct messaging_context *msg,
 458                          void *private_data,
 459                          uint32_t msg_type,
 460                          struct server_id server_id,
 461                          DATA_BLOB *data)
 462 {
 463         /* only the parent waits for this message */
 464         DEBUG(0,("Got shutdown message\n"));
 465         terminate(true);
 466 }
 467
 468
 469 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
 470                                        void *private_data,
 471                                        uint32_t msg_type,
 472                                        struct server_id server_id,
 473                                        DATA_BLOB *data)
 474 {
 475         uint8_t ret;
 476         pid_t child_pid;
 477         NTSTATUS status;
 478
 479         DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
 480                    "message.\n"));
 481
 482         /*
 483          * call the validation code from a child:
 484          * so we don't block the main winbindd and the validation
 485          * code can safely use fork/waitpid...
 486          */
 487         child_pid = fork();
 488
 489         if (child_pid == -1) {
 490                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
 491                           strerror(errno)));
 492                 return;
 493         }
 494
 495         if (child_pid != 0) {
 496                 /* parent */
 497                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
 498                           "pid %d.\n", (int)child_pid));
 499                 return;
 500         }
 501
 502         /* child */
 503
 504         status = winbindd_reinit_after_fork(NULL, NULL);
 505         if (!NT_STATUS_IS_OK(status)) {
 506                 DEBUG(1, ("winbindd_reinit_after_fork failed: %s\n",
 507                           nt_errstr(status)));
 508                 _exit(0);
 509         }
 510
 511         /* install default SIGCHLD handler: validation code uses fork/waitpid */
 512         CatchSignal(SIGCHLD, SIG_DFL);
 513
 514         setproctitle("validate cache child");
 515
 516         ret = (uint8_t)winbindd_validate_cache_nobackup();
 517         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
 518         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
 519                            (size_t)1);
 520         _exit(0);
 521 }
 522
 523 static struct winbindd_dispatch_table {
 524         enum winbindd_cmd cmd;
 525         void (*fn)(struct winbindd_cli_state *state);
 526         const char *winbindd_cmd_name;
 527 } dispatch_table[] = {
 528
 529         /* Enumeration functions */
 530
 531         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 532           "LIST_TRUSTDOM" },
 533
 534         /* Miscellaneous */
 535
 536         { WINBINDD_INFO, winbindd_info, "INFO" },
 537         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 538           "INTERFACE_VERSION" },
 539         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 540         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 541         { WINBINDD_DC_INFO, winbindd_dc_info, "DC_INFO" },
 542         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 543         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 544           "WINBINDD_PRIV_PIPE_DIR" },
 545
 546         /* Credential cache access */
 547         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 548         { WINBINDD_CCACHE_SAVE, winbindd_ccache_save, "CCACHE_SAVE" },
 549
 550         /* End of list */
 551
 552         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 553 };
 554
 555 struct winbindd_async_dispatch_table {
 556         enum winbindd_cmd cmd;
 557         const char *cmd_name;
 558         struct tevent_req *(*send_req)(TALLOC_CTX *mem_ctx,
 559                                        struct tevent_context *ev,
 560                                        struct winbindd_cli_state *cli,
 561                                        struct winbindd_request *request);
 562         NTSTATUS (*recv_req)(struct tevent_req *req,
 563                              struct winbindd_response *presp);
 564 };
 565
 566 static struct winbindd_async_dispatch_table async_nonpriv_table[] = {
 567         { WINBINDD_PING, "PING",
 568           wb_ping_send, wb_ping_recv },
 569         { WINBINDD_LOOKUPSID, "LOOKUPSID",
 570           winbindd_lookupsid_send, winbindd_lookupsid_recv },
 571         { WINBINDD_LOOKUPSIDS, "LOOKUPSIDS",
 572           winbindd_lookupsids_send, winbindd_lookupsids_recv },
 573         { WINBINDD_LOOKUPNAME, "LOOKUPNAME",
 574           winbindd_lookupname_send, winbindd_lookupname_recv },
 575         { WINBINDD_SIDS_TO_XIDS, "SIDS_TO_XIDS",
 576           winbindd_sids_to_xids_send, winbindd_sids_to_xids_recv },
 577         { WINBINDD_XIDS_TO_SIDS, "XIDS_TO_SIDS",
 578           winbindd_xids_to_sids_send, winbindd_xids_to_sids_recv },
 579         { WINBINDD_GETPWSID, "GETPWSID",
 580           winbindd_getpwsid_send, winbindd_getpwsid_recv },
 581         { WINBINDD_GETPWNAM, "GETPWNAM",
 582           winbindd_getpwnam_send, winbindd_getpwnam_recv },
 583         { WINBINDD_GETPWUID, "GETPWUID",
 584           winbindd_getpwuid_send, winbindd_getpwuid_recv },
 585         { WINBINDD_GETSIDALIASES, "GETSIDALIASES",
 586           winbindd_getsidaliases_send, winbindd_getsidaliases_recv },
 587         { WINBINDD_GETUSERDOMGROUPS, "GETUSERDOMGROUPS",
 588           winbindd_getuserdomgroups_send, winbindd_getuserdomgroups_recv },
 589         { WINBINDD_GETGROUPS, "GETGROUPS",
 590           winbindd_getgroups_send, winbindd_getgroups_recv },
 591         { WINBINDD_SHOW_SEQUENCE, "SHOW_SEQUENCE",
 592           winbindd_show_sequence_send, winbindd_show_sequence_recv },
 593         { WINBINDD_GETGRGID, "GETGRGID",
 594           winbindd_getgrgid_send, winbindd_getgrgid_recv },
 595         { WINBINDD_GETGRNAM, "GETGRNAM",
 596           winbindd_getgrnam_send, winbindd_getgrnam_recv },
 597         { WINBINDD_GETUSERSIDS, "GETUSERSIDS",
 598           winbindd_getusersids_send, winbindd_getusersids_recv },
 599         { WINBINDD_LOOKUPRIDS, "LOOKUPRIDS",
 600           winbindd_lookuprids_send, winbindd_lookuprids_recv },
 601         { WINBINDD_SETPWENT, "SETPWENT",
 602           winbindd_setpwent_send, winbindd_setpwent_recv },
 603         { WINBINDD_GETPWENT, "GETPWENT",
 604           winbindd_getpwent_send, winbindd_getpwent_recv },
 605         { WINBINDD_ENDPWENT, "ENDPWENT",
 606           winbindd_endpwent_send, winbindd_endpwent_recv },
 607         { WINBINDD_DSGETDCNAME, "DSGETDCNAME",
 608           winbindd_dsgetdcname_send, winbindd_dsgetdcname_recv },
 609         { WINBINDD_GETDCNAME, "GETDCNAME",
 610           winbindd_getdcname_send, winbindd_getdcname_recv },
 611         { WINBINDD_SETGRENT, "SETGRENT",
 612           winbindd_setgrent_send, winbindd_setgrent_recv },
 613         { WINBINDD_GETGRENT, "GETGRENT",
 614           winbindd_getgrent_send, winbindd_getgrent_recv },
 615         { WINBINDD_ENDGRENT, "ENDGRENT",
 616           winbindd_endgrent_send, winbindd_endgrent_recv },
 617         { WINBINDD_LIST_USERS, "LIST_USERS",
 618           winbindd_list_users_send, winbindd_list_users_recv },
 619         { WINBINDD_LIST_GROUPS, "LIST_GROUPS",
 620           winbindd_list_groups_send, winbindd_list_groups_recv },
 621         { WINBINDD_CHECK_MACHACC, "CHECK_MACHACC",
 622           winbindd_check_machine_acct_send, winbindd_check_machine_acct_recv },
 623         { WINBINDD_PING_DC, "PING_DC",
 624           winbindd_ping_dc_send, winbindd_ping_dc_recv },
 625         { WINBINDD_PAM_AUTH, "PAM_AUTH",
 626           winbindd_pam_auth_send, winbindd_pam_auth_recv },
 627         { WINBINDD_PAM_LOGOFF, "PAM_LOGOFF",
 628           winbindd_pam_logoff_send, winbindd_pam_logoff_recv },
 629         { WINBINDD_PAM_CHAUTHTOK, "PAM_CHAUTHTOK",
 630           winbindd_pam_chauthtok_send, winbindd_pam_chauthtok_recv },
 631         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, "PAM_CHNG_PSWD_AUTH_CRAP",
 632           winbindd_pam_chng_pswd_auth_crap_send,
 633           winbindd_pam_chng_pswd_auth_crap_recv },
 634         { WINBINDD_WINS_BYIP, "WINS_BYIP",
 635           winbindd_wins_byip_send, winbindd_wins_byip_recv },
 636         { WINBINDD_WINS_BYNAME, "WINS_BYNAME",
 637           winbindd_wins_byname_send, winbindd_wins_byname_recv },
 638
 639         { 0, NULL, NULL, NULL }
 640 };
 641
 642 static struct winbindd_async_dispatch_table async_priv_table[] = {
 643         { WINBINDD_ALLOCATE_UID, "ALLOCATE_UID",
 644           winbindd_allocate_uid_send, winbindd_allocate_uid_recv },
 645         { WINBINDD_ALLOCATE_GID, "ALLOCATE_GID",
 646           winbindd_allocate_gid_send, winbindd_allocate_gid_recv },
 647         { WINBINDD_CHANGE_MACHACC, "CHANGE_MACHACC",
 648           winbindd_change_machine_acct_send, winbindd_change_machine_acct_recv },
 649         { WINBINDD_PAM_AUTH_CRAP, "PAM_AUTH_CRAP",
 650           winbindd_pam_auth_crap_send, winbindd_pam_auth_crap_recv },
 651
 652         { 0, NULL, NULL, NULL }
 653 };
 654
 655 static void wb_request_done(struct tevent_req *req);
 656
 657 static void process_request(struct winbindd_cli_state *state)
 658 {
 659         struct winbindd_dispatch_table *table = dispatch_table;
 660         struct winbindd_async_dispatch_table *atable;
 661
 662         state->mem_ctx = talloc_named(state, 0, "winbind request");
 663         if (state->mem_ctx == NULL)
 664                 return;
 665
 666         /* Remember who asked us. */
 667         state->pid = state->request->pid;
 668
 669         state->cmd_name = "unknown request";
 670         state->recv_fn = NULL;
 671         /* client is newest */
 672         winbindd_promote_client(state);
 673
 674         /* Process command */
 675
 676         for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
 677                 if (state->request->cmd == atable->cmd) {
 678                         break;
 679                 }
 680         }
 681
 682         if ((atable->send_req == NULL) && state->privileged) {
 683                 for (atable = async_priv_table; atable->send_req;
 684                      atable += 1) {
 685                         if (state->request->cmd == atable->cmd) {
 686                                 break;
 687                         }
 688                 }
 689         }
 690
 691         if (atable->send_req != NULL) {
 692                 struct tevent_req *req;
 693
 694                 state->cmd_name = atable->cmd_name;
 695                 state->recv_fn = atable->recv_req;
 696
 697                 DEBUG(10, ("process_request: Handling async request %d:%s\n",
 698                            (int)state->pid, state->cmd_name));
 699
 700                 req = atable->send_req(state->mem_ctx, server_event_context(),
 701                                        state, state->request);
 702                 if (req == NULL) {
 703                         DEBUG(0, ("process_request: atable->send failed for "
 704                                   "%s\n", atable->cmd_name));
 705                         request_error(state);
 706                         return;
 707                 }
 708                 tevent_req_set_callback(req, wb_request_done, state);
 709                 return;
 710         }
 711
 712         state->response = talloc_zero(state->mem_ctx,
 713                                       struct winbindd_response);
 714         if (state->response == NULL) {
 715                 DEBUG(10, ("talloc failed\n"));
 716                 remove_client(state);
 717                 return;
 718         }
 719         state->response->result = WINBINDD_PENDING;
 720         state->response->length = sizeof(struct winbindd_response);
 721
 722         for (table = dispatch_table; table->fn; table++) {
 723                 if (state->request->cmd == table->cmd) {
 724                         DEBUG(10,("process_request: request fn %s\n",
 725                                   table->winbindd_cmd_name ));
 726                         state->cmd_name = table->winbindd_cmd_name;
 727                         table->fn(state);
 728                         break;
 729                 }
 730         }
 731
 732         if (!table->fn) {
 733                 DEBUG(10,("process_request: unknown request fn number %d\n",
 734                           (int)state->request->cmd ));
 735                 request_error(state);
 736         }
 737 }
 738
 739 static void wb_request_done(struct tevent_req *req)
 740 {
 741         struct winbindd_cli_state *state = tevent_req_callback_data(
 742                 req, struct winbindd_cli_state);
 743         NTSTATUS status;
 744
 745         state->response = talloc_zero(state->mem_ctx,
 746                                       struct winbindd_response);
 747         if (state->response == NULL) {
 748                 DEBUG(0, ("wb_request_done[%d:%s]: talloc_zero failed - removing client\n",
 749                           (int)state->pid, state->cmd_name));
 750                 remove_client(state);
 751                 return;
 752         }
 753         state->response->result = WINBINDD_PENDING;
 754         state->response->length = sizeof(struct winbindd_response);
 755
 756         status = state->recv_fn(req, state->response);
 757         TALLOC_FREE(req);
 758
 759         DEBUG(10,("wb_request_done[%d:%s]: %s\n",
 760                   (int)state->pid, state->cmd_name, nt_errstr(status)));
 761
 762         if (!NT_STATUS_IS_OK(status)) {
 763                 request_error(state);
 764                 return;
 765         }
 766         request_ok(state);
 767 }
 768
 769 /*
 770  * This is the main event loop of winbind requests. It goes through a
 771  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 772  *
 773  * An idle winbind client has a read request of 4 bytes outstanding,
 774  * finalizing function is request_len_recv, checking the length. request_recv
 775  * then processes the packet. The processing function then at some point has
 776  * to call request_finished which schedules sending the response.
 777  */
 778
 779 static void request_finished(struct winbindd_cli_state *state);
 780
 781 static void winbind_client_request_read(struct tevent_req *req);
 782 static void winbind_client_response_written(struct tevent_req *req);
 783 static void winbind_client_activity(struct tevent_req *req);
 784
 785 static void request_finished(struct winbindd_cli_state *state)
 786 {
 787         struct tevent_req *req;
 788
 789         /* free client socket monitoring request */
 790         TALLOC_FREE(state->io_req);
 791
 792         TALLOC_FREE(state->request);
 793
 794         req = wb_resp_write_send(state, server_event_context(),
 795                                  state->out_queue, state->sock,
 796                                  state->response);
 797         if (req == NULL) {
 798                 DEBUG(10,("request_finished[%d:%s]: wb_resp_write_send() failed\n",
 799                           (int)state->pid, state->cmd_name));
 800                 remove_client(state);
 801                 return;
 802         }
 803         tevent_req_set_callback(req, winbind_client_response_written, state);
 804         state->io_req = req;
 805 }
 806
 807 static void winbind_client_response_written(struct tevent_req *req)
 808 {
 809         struct winbindd_cli_state *state = tevent_req_callback_data(
 810                 req, struct winbindd_cli_state);
 811         ssize_t ret;
 812         int err;
 813
 814         state->io_req = NULL;
 815
 816         ret = wb_resp_write_recv(req, &err);
 817         TALLOC_FREE(req);
 818         if (ret == -1) {
 819                 close(state->sock);
 820                 state->sock = -1;
 821                 DEBUG(2, ("Could not write response[%d:%s] to client: %s\n",
 822                           (int)state->pid, state->cmd_name, strerror(err)));
 823                 remove_client(state);
 824                 return;
 825         }
 826
 827         DEBUG(10,("winbind_client_response_written[%d:%s]: delivered response "
 828                   "to client\n", (int)state->pid, state->cmd_name));
 829
 830         TALLOC_FREE(state->mem_ctx);
 831         state->response = NULL;
 832         state->cmd_name = "no request";
 833         state->recv_fn = NULL;
 834
 835         req = wb_req_read_send(state, server_event_context(), state->sock,
 836                                WINBINDD_MAX_EXTRA_DATA);
 837         if (req == NULL) {
 838                 remove_client(state);
 839                 return;
 840         }
 841         tevent_req_set_callback(req, winbind_client_request_read, state);
 842         state->io_req = req;
 843 }
 844
 845 void request_error(struct winbindd_cli_state *state)
 846 {
 847         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 848         state->response->result = WINBINDD_ERROR;
 849         request_finished(state);
 850 }
 851
 852 void request_ok(struct winbindd_cli_state *state)
 853 {
 854         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 855         state->response->result = WINBINDD_OK;
 856         request_finished(state);
 857 }
 858
 859 /* Process a new connection by adding it to the client connection list */
 860
 861 static void new_connection(int listen_sock, bool privileged)
 862 {
 863         struct sockaddr_un sunaddr;
 864         struct winbindd_cli_state *state;
 865         struct tevent_req *req;
 866         socklen_t len;
 867         int sock;
 868
 869         /* Accept connection */
 870
 871         len = sizeof(sunaddr);
 872
 873         sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr, &len);
 874
 875         if (sock == -1) {
 876                 if (errno != EINTR) {
 877                         DEBUG(0, ("Failed to accept socket - %s\n",
 878                                   strerror(errno)));
 879                 }
 880                 return;
 881         }
 882         smb_set_close_on_exec(sock);
 883
 884         DEBUG(6,("accepted socket %d\n", sock));
 885
 886         /* Create new connection structure */
 887
 888         if ((state = talloc_zero(NULL, struct winbindd_cli_state)) == NULL) {
 889                 close(sock);
 890                 return;
 891         }
 892
 893         state->sock = sock;
 894
 895         state->out_queue = tevent_queue_create(state, "winbind client reply");
 896         if (state->out_queue == NULL) {
 897                 close(sock);
 898                 TALLOC_FREE(state);
 899                 return;
 900         }
 901
 902         state->privileged = privileged;
 903
 904         req = wb_req_read_send(state, server_event_context(), state->sock,
 905                                WINBINDD_MAX_EXTRA_DATA);
 906         if (req == NULL) {
 907                 TALLOC_FREE(state);
 908                 close(sock);
 909                 return;
 910         }
 911         tevent_req_set_callback(req, winbind_client_request_read, state);
 912         state->io_req = req;
 913
 914         /* Add to connection list */
 915
 916         winbindd_add_client(state);
 917 }
 918
 919 static void winbind_client_request_read(struct tevent_req *req)
 920 {
 921         struct winbindd_cli_state *state = tevent_req_callback_data(
 922                 req, struct winbindd_cli_state);
 923         ssize_t ret;
 924         int err;
 925
 926         state->io_req = NULL;
 927
 928         ret = wb_req_read_recv(req, state, &state->request, &err);
 929         TALLOC_FREE(req);
 930         if (ret == -1) {
 931                 if (err == EPIPE) {
 932                         DEBUG(6, ("closing socket %d, client exited\n",
 933                                   state->sock));
 934                 } else {
 935                         DEBUG(2, ("Could not read client request from fd %d: "
 936                                   "%s\n", state->sock, strerror(err)));
 937                 }
 938                 close(state->sock);
 939                 state->sock = -1;
 940                 remove_client(state);
 941                 return;
 942         }
 943
 944         req = wait_for_read_send(state, server_event_context(), state->sock,
 945                                  true);
 946         if (req == NULL) {
 947                 DEBUG(0, ("winbind_client_request_read[%d:%s]:"
 948                           " wait_for_read_send failed - removing client\n",
 949                           (int)state->pid, state->cmd_name));
 950                 remove_client(state);
 951                 return;
 952         }
 953         tevent_req_set_callback(req, winbind_client_activity, state);
 954         state->io_req = req;
 955
 956         process_request(state);
 957 }
 958
 959 static void winbind_client_activity(struct tevent_req *req)
 960 {
 961         struct winbindd_cli_state *state =
 962             tevent_req_callback_data(req, struct winbindd_cli_state);
 963         int err;
 964         bool has_data;
 965
 966         has_data = wait_for_read_recv(req, &err);
 967
 968         if (has_data) {
 969                 DEBUG(0, ("winbind_client_activity[%d:%s]:"
 970                           "unexpected data from client - removing client\n",
 971                           (int)state->pid, state->cmd_name));
 972         } else {
 973                 if (err == EPIPE) {
 974                         DEBUG(6, ("winbind_client_activity[%d:%s]: "
 975                                   "client has closed connection - removing "
 976                                   "client\n",
 977                                   (int)state->pid, state->cmd_name));
 978                 } else {
 979                         DEBUG(2, ("winbind_client_activity[%d:%s]: "
 980                                   "client socket error (%s) - removing "
 981                                   "client\n",
 982                                   (int)state->pid, state->cmd_name,
 983                                   strerror(err)));
 984                 }
 985         }
 986
 987         remove_client(state);
 988 }
 989
 990 /* Remove a client connection from client connection list */
 991
 992 static void remove_client(struct winbindd_cli_state *state)
 993 {
 994         char c = 0;
 995         int nwritten;
 996
 997         /* It's a dead client - hold a funeral */
 998
 999         if (state == NULL) {
1000                 return;
1001         }
1002
1003         /*
1004          * We need to remove a pending wb_req_read_*
1005          * or wb_resp_write_* request before closing the
1006          * socket.
1007          *
1008          * This is important as they might have used tevent_add_fd() and we
1009          * use the epoll * backend on linux. So we must remove the tevent_fd
1010          * before closing the fd.
1011          *
1012          * Otherwise we might hit a race with close_conns_after_fork() (via
1013          * winbindd_reinit_after_fork()) where a file description
1014          * is still open in a child, which means it's still active in
1015          * the parents epoll queue, but the related tevent_fd is already
1016          * already gone in the parent.
1017          *
1018          * See bug #11141.
1019          */
1020         TALLOC_FREE(state->io_req);
1021
1022         if (state->sock != -1) {
1023                 /* tell client, we are closing ... */
1024                 nwritten = write(state->sock, &c, sizeof(c));
1025                 if (nwritten == -1) {
1026                         DEBUG(2, ("final write to client failed: %s\n",
1027                                 strerror(errno)));
1028                 }
1029
1030                 /* Close socket */
1031
1032                 close(state->sock);
1033                 state->sock = -1;
1034         }
1035
1036         TALLOC_FREE(state->mem_ctx);
1037
1038         /* Remove from list and free */
1039
1040         winbindd_remove_client(state);
1041         TALLOC_FREE(state);
1042 }
1043
1044 /* Is a client idle? */
1045
1046 static bool client_is_idle(struct winbindd_cli_state *state) {
1047   return (state->request == NULL &&
1048           state->response == NULL &&
1049           !state->pwent_state && !state->grent_state);
1050 }
1051
1052 /* Shutdown client connection which has been idle for the longest time */
1053
1054 static bool remove_idle_client(void)
1055 {
1056         struct winbindd_cli_state *state, *remove_state = NULL;
1057         int nidle = 0;
1058
1059         for (state = winbindd_client_list(); state; state = state->next) {
1060                 if (client_is_idle(state)) {
1061                         nidle++;
1062                         /* list is sorted by access time */
1063                         remove_state = state;
1064                 }
1065         }
1066
1067         if (remove_state) {
1068                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
1069                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
1070                 remove_client(remove_state);
1071                 return True;
1072         }
1073
1074         return False;
1075 }
1076
1077 /*
1078  * Terminate all clients whose requests have taken longer than
1079  * "winbind request timeout" seconds to process, or have been
1080  * idle for more than "winbind request timeout" seconds.
1081  */
1082
1083 static void remove_timed_out_clients(void)
1084 {
1085         struct winbindd_cli_state *state, *prev = NULL;
1086         time_t curr_time = time(NULL);
1087         int timeout_val = lp_winbind_request_timeout();
1088
1089         for (state = winbindd_client_list_tail(); state; state = prev) {
1090                 time_t expiry_time;
1091
1092                 prev = winbindd_client_list_prev(state);
1093                 expiry_time = state->last_access + timeout_val;
1094
1095                 if (curr_time <= expiry_time) {
1096                         /* list is sorted, previous clients in
1097                            list are newer */
1098                         break;
1099                 }
1100
1101                 if (client_is_idle(state)) {
1102                         DEBUG(5,("Idle client timed out, "
1103                                  "shutting down sock %d, pid %u\n",
1104                                  state->sock,
1105                                  (unsigned int)state->pid));
1106                 } else {
1107                         DEBUG(5,("Client request timed out, "
1108                                  "shutting down sock %d, pid %u\n",
1109                                  state->sock,
1110                                  (unsigned int)state->pid));
1111                 }
1112
1113                 remove_client(state);
1114         }
1115 }
1116
1117 static void winbindd_scrub_clients_handler(struct tevent_context *ev,
1118                                            struct tevent_timer *te,
1119                                            struct timeval current_time,
1120                                            void *private_data)
1121 {
1122         remove_timed_out_clients();
1123         if (tevent_add_timer(ev, ev,
1124                              timeval_current_ofs(SCRUB_CLIENTS_INTERVAL, 0),
1125                              winbindd_scrub_clients_handler, NULL) == NULL) {
1126                 DEBUG(0, ("winbindd: failed to reschedule client scrubber\n"));
1127                 exit(1);
1128         }
1129 }
1130
1131 struct winbindd_listen_state {
1132         bool privileged;
1133         int fd;
1134 };
1135
1136 static void winbindd_listen_fde_handler(struct tevent_context *ev,
1137                                         struct tevent_fd *fde,
1138                                         uint16_t flags,
1139                                         void *private_data)
1140 {
1141         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
1142                                           struct winbindd_listen_state);
1143
1144         while (winbindd_num_clients() > lp_winbind_max_clients() - 1) {
1145                 DEBUG(5,("winbindd: Exceeding %d client "
1146                          "connections, removing idle "
1147                          "connection.\n", lp_winbind_max_clients()));
1148                 if (!remove_idle_client()) {
1149                         DEBUG(0,("winbindd: Exceeding %d "
1150                                  "client connections, no idle "
1151                                  "connection found\n",
1152                                  lp_winbind_max_clients()));
1153                         break;
1154                 }
1155         }
1156         remove_timed_out_clients();
1157         new_connection(s->fd, s->privileged);
1158 }
1159
1160 /*
1161  * Winbindd socket accessor functions
1162  */
1163
1164 char *get_winbind_priv_pipe_dir(void)
1165 {
1166         return state_path(WINBINDD_PRIV_SOCKET_SUBDIR);
1167 }
1168
1169 static void winbindd_setup_max_fds(void)
1170 {
1171         int num_fds = MAX_OPEN_FUDGEFACTOR;
1172         int actual_fds;
1173
1174         num_fds += lp_winbind_max_clients();
1175         /* Add some more to account for 2 sockets open
1176            when the client transitions from unprivileged
1177            to privileged socket
1178         */
1179         num_fds += lp_winbind_max_clients() / 10;
1180
1181         /* Add one socket per child process
1182            (yeah there are child processes other than the
1183            domain children but only domain children can vary
1184            with configuration
1185         */
1186         num_fds += lp_winbind_max_domain_connections() *
1187                    (lp_allow_trusted_domains() ? WINBIND_MAX_DOMAINS_HINT : 1);
1188
1189         actual_fds = set_maxfiles(num_fds);
1190
1191         if (actual_fds < num_fds) {
1192                 DEBUG(1, ("winbindd_setup_max_fds: Information only: "
1193                           "requested %d open files, %d are available.\n",
1194                           num_fds, actual_fds));
1195         }
1196 }
1197
1198 static bool winbindd_setup_listeners(void)
1199 {
1200         struct winbindd_listen_state *pub_state = NULL;
1201         struct winbindd_listen_state *priv_state = NULL;
1202         struct tevent_fd *fde;
1203         int rc;
1204         char *socket_path;
1205
1206         pub_state = talloc(server_event_context(),
1207                            struct winbindd_listen_state);
1208         if (!pub_state) {
1209                 goto failed;
1210         }
1211
1212         pub_state->privileged = false;
1213         pub_state->fd = create_pipe_sock(
1214                 lp_winbindd_socket_directory(), WINBINDD_SOCKET_NAME, 0755);
1215         if (pub_state->fd == -1) {
1216                 goto failed;
1217         }
1218         rc = listen(pub_state->fd, 5);
1219         if (rc < 0) {
1220                 goto failed;
1221         }
1222
1223         fde = tevent_add_fd(server_event_context(), pub_state, pub_state->fd,
1224                             TEVENT_FD_READ, winbindd_listen_fde_handler,
1225                             pub_state);
1226         if (fde == NULL) {
1227                 close(pub_state->fd);
1228                 goto failed;
1229         }
1230         tevent_fd_set_auto_close(fde);
1231
1232         priv_state = talloc(server_event_context(),
1233                             struct winbindd_listen_state);
1234         if (!priv_state) {
1235                 goto failed;
1236         }
1237
1238         socket_path = get_winbind_priv_pipe_dir();
1239         if (socket_path == NULL) {
1240                 goto failed;
1241         }
1242
1243         priv_state->privileged = true;
1244         priv_state->fd = create_pipe_sock(
1245                 socket_path, WINBINDD_SOCKET_NAME, 0750);
1246         TALLOC_FREE(socket_path);
1247         if (priv_state->fd == -1) {
1248                 goto failed;
1249         }
1250         rc = listen(priv_state->fd, 5);
1251         if (rc < 0) {
1252                 goto failed;
1253         }
1254
1255         fde = tevent_add_fd(server_event_context(), priv_state,
1256                             priv_state->fd, TEVENT_FD_READ,
1257                             winbindd_listen_fde_handler, priv_state);
1258         if (fde == NULL) {
1259                 close(priv_state->fd);
1260                 goto failed;
1261         }
1262         tevent_fd_set_auto_close(fde);
1263
1264         winbindd_scrub_clients_handler(server_event_context(), NULL,
1265                                        timeval_current(), NULL);
1266         return true;
1267 failed:
1268         TALLOC_FREE(pub_state);
1269         TALLOC_FREE(priv_state);
1270         return false;
1271 }
1272
1273 bool winbindd_use_idmap_cache(void)
1274 {
1275         return !opt_nocache;
1276 }
1277
1278 bool winbindd_use_cache(void)
1279 {
1280         return !opt_nocache;
1281 }
1282
1283 static void winbindd_register_handlers(struct messaging_context *msg_ctx,
1284                                        bool foreground)
1285 {
1286         bool scan_trusts = true;
1287         NTSTATUS status;
1288         /* Setup signal handlers */
1289
1290         if (!winbindd_setup_sig_term_handler(true))
1291                 exit(1);
1292         if (!winbindd_setup_stdin_handler(true, foreground))
1293                 exit(1);
1294         if (!winbindd_setup_sig_hup_handler(NULL))
1295                 exit(1);
1296         if (!winbindd_setup_sig_chld_handler())
1297                 exit(1);
1298         if (!winbindd_setup_sig_usr2_handler())
1299                 exit(1);
1300
1301         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1302
1303         /*
1304          * Ensure all cache and idmap caches are consistent
1305          * and initialized before we startup.
1306          */
1307         if (!winbindd_cache_validate_and_initialize()) {
1308                 exit(1);
1309         }
1310
1311         /* React on 'smbcontrol winbindd reload-config' in the same way
1312            as to SIGHUP signal */
1313         messaging_register(msg_ctx, NULL,
1314                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1315         messaging_register(msg_ctx, NULL,
1316                            MSG_SHUTDOWN, msg_shutdown);
1317
1318         /* Handle online/offline messages. */
1319         messaging_register(msg_ctx, NULL,
1320                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1321         messaging_register(msg_ctx, NULL,
1322                            MSG_WINBIND_ONLINE, winbind_msg_online);
1323         messaging_register(msg_ctx, NULL,
1324                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1325
1326         /* Handle domain online/offline messages for domains */
1327         messaging_register(server_messaging_context(), NULL,
1328                            MSG_WINBIND_DOMAIN_OFFLINE, winbind_msg_domain_offline);
1329         messaging_register(server_messaging_context(), NULL,
1330                            MSG_WINBIND_DOMAIN_ONLINE, winbind_msg_domain_online);
1331
1332         messaging_register(msg_ctx, NULL,
1333                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1334
1335         messaging_register(msg_ctx, NULL,
1336                            MSG_WINBIND_VALIDATE_CACHE,
1337                            winbind_msg_validate_cache);
1338
1339         messaging_register(msg_ctx, NULL,
1340                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1341                            winbind_msg_dump_domain_list);
1342
1343         messaging_register(msg_ctx, NULL,
1344                            MSG_WINBIND_IP_DROPPED,
1345                            winbind_msg_ip_dropped_parent);
1346
1347         /* Register handler for MSG_DEBUG. */
1348         messaging_register(msg_ctx, NULL,
1349                            MSG_DEBUG,
1350                            winbind_msg_debug);
1351
1352         netsamlogon_cache_init(); /* Non-critical */
1353
1354         /* clear the cached list of trusted domains */
1355
1356         wcache_tdc_clear();
1357
1358         if (!init_domain_list()) {
1359                 DEBUG(0,("unable to initialize domain list\n"));
1360                 exit(1);
1361         }
1362
1363         init_idmap_child();
1364         init_locator_child();
1365
1366         smb_nscd_flush_user_cache();
1367         smb_nscd_flush_group_cache();
1368
1369         if (!lp_winbind_scan_trusted_domains()) {
1370                 scan_trusts = false;
1371         }
1372
1373         if (!lp_allow_trusted_domains()) {
1374                 scan_trusts = false;
1375         }
1376
1377         if (IS_DC) {
1378                 scan_trusts = false;
1379         }
1380
1381         if (scan_trusts) {
1382                 if (tevent_add_timer(server_event_context(), NULL, timeval_zero(),
1383                               rescan_trusted_domains, NULL) == NULL) {
1384                         DEBUG(0, ("Could not trigger rescan_trusted_domains()\n"));
1385                         exit(1);
1386                 }
1387         }
1388
1389         status = wb_irpc_register();
1390
1391         if (!NT_STATUS_IS_OK(status)) {
1392                 DEBUG(0, ("Could not register IRPC handlers\n"));
1393                 exit(1);
1394         }
1395 }
1396
1397 struct winbindd_addrchanged_state {
1398         struct addrchange_context *ctx;
1399         struct tevent_context *ev;
1400         struct messaging_context *msg_ctx;
1401 };
1402
1403 static void winbindd_addr_changed(struct tevent_req *req);
1404
1405 static void winbindd_init_addrchange(TALLOC_CTX *mem_ctx,
1406                                      struct tevent_context *ev,
1407                                      struct messaging_context *msg_ctx)
1408 {
1409         struct winbindd_addrchanged_state *state;
1410         struct tevent_req *req;
1411         NTSTATUS status;
1412
1413         state = talloc(mem_ctx, struct winbindd_addrchanged_state);
1414         if (state == NULL) {
1415                 DEBUG(10, ("talloc failed\n"));
1416                 return;
1417         }
1418         state->ev = ev;
1419         state->msg_ctx = msg_ctx;
1420
1421         status = addrchange_context_create(state, &state->ctx);
1422         if (!NT_STATUS_IS_OK(status)) {
1423                 DEBUG(10, ("addrchange_context_create failed: %s\n",
1424                            nt_errstr(status)));
1425                 TALLOC_FREE(state);
1426                 return;
1427         }
1428         req = addrchange_send(state, ev, state->ctx);
1429         if (req == NULL) {
1430                 DEBUG(0, ("addrchange_send failed\n"));
1431                 TALLOC_FREE(state);
1432                 return;
1433         }
1434         tevent_req_set_callback(req, winbindd_addr_changed, state);
1435 }
1436
1437 static void winbindd_addr_changed(struct tevent_req *req)
1438 {
1439         struct winbindd_addrchanged_state *state = tevent_req_callback_data(
1440                 req, struct winbindd_addrchanged_state);
1441         enum addrchange_type type;
1442         struct sockaddr_storage addr;
1443         NTSTATUS status;
1444
1445         status = addrchange_recv(req, &type, &addr);
1446         TALLOC_FREE(req);
1447         if (!NT_STATUS_IS_OK(status)) {
1448                 DEBUG(10, ("addrchange_recv failed: %s, stop listening\n",
1449                            nt_errstr(status)));
1450                 TALLOC_FREE(state);
1451                 return;
1452         }
1453         if (type == ADDRCHANGE_DEL) {
1454                 char addrstr[INET6_ADDRSTRLEN];
1455                 DATA_BLOB blob;
1456
1457                 print_sockaddr(addrstr, sizeof(addrstr), &addr);
1458
1459                 DEBUG(3, ("winbindd: kernel (AF_NETLINK) dropped ip %s\n",
1460                           addrstr));
1461
1462                 blob = data_blob_const(addrstr, strlen(addrstr)+1);
1463
1464                 status = messaging_send(state->msg_ctx,
1465                                         messaging_server_id(state->msg_ctx),
1466                                         MSG_WINBIND_IP_DROPPED, &blob);
1467                 if (!NT_STATUS_IS_OK(status)) {
1468                         DEBUG(10, ("messaging_send failed: %s - ignoring\n",
1469                                    nt_errstr(status)));
1470                 }
1471         }
1472         req = addrchange_send(state, state->ev, state->ctx);
1473         if (req == NULL) {
1474                 DEBUG(0, ("addrchange_send failed\n"));
1475                 TALLOC_FREE(state);
1476                 return;
1477         }
1478         tevent_req_set_callback(req, winbindd_addr_changed, state);
1479 }
1480
1481 /* Main function */
1482
1483 int main(int argc, const char **argv)
1484 {
1485         static bool is_daemon = False;
1486         static bool Fork = True;
1487         static bool log_stdout = False;
1488         static bool no_process_group = False;
1489         enum {
1490                 OPT_DAEMON = 1000,
1491                 OPT_FORK,
1492                 OPT_NO_PROCESS_GROUP,
1493                 OPT_LOG_STDOUT
1494         };
1495         struct poptOption long_options[] = {
1496                 POPT_AUTOHELP
1497                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1498                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1499                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1500                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1501                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1502                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1503                 POPT_COMMON_SAMBA
1504                 POPT_TABLEEND
1505         };
1506         poptContext pc;
1507         int opt;
1508         TALLOC_CTX *frame;
1509         NTSTATUS status;
1510         bool ok;
1511
1512         setproctitle_init(argc, discard_const(argv), environ);
1513
1514         /*
1515          * Do this before any other talloc operation
1516          */
1517         talloc_enable_null_tracking();
1518         frame = talloc_stackframe();
1519
1520         /*
1521          * We want total control over the permissions on created files,
1522          * so set our umask to 0.
1523          */
1524         umask(0);
1525
1526         setup_logging("winbindd", DEBUG_DEFAULT_STDOUT);
1527
1528         /* glibc (?) likes to print "User defined signal 1" and exit if a
1529            SIGUSR[12] is received before a handler is installed */
1530
1531         CatchSignal(SIGUSR1, SIG_IGN);
1532         CatchSignal(SIGUSR2, SIG_IGN);
1533
1534         fault_setup();
1535         dump_core_setup("winbindd", lp_logfile(talloc_tos()));
1536
1537         smb_init_locale();
1538
1539         /* Initialise for running in non-root mode */
1540
1541         sec_init();
1542
1543         set_remote_machine_name("winbindd", False);
1544
1545         /* Set environment variable so we don't recursively call ourselves.
1546            This may also be useful interactively. */
1547
1548         if ( !winbind_off() ) {
1549                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1550                 exit(1);
1551         }
1552
1553         /* Initialise samba/rpc client stuff */
1554
1555         pc = poptGetContext("winbindd", argc, argv, long_options, 0);
1556
1557         while ((opt = poptGetNextOpt(pc)) != -1) {
1558                 switch (opt) {
1559                         /* Don't become a daemon */
1560                 case OPT_DAEMON:
1561                         is_daemon = True;
1562                         break;
1563                 case 'i':
1564                         interactive = True;
1565                         log_stdout = True;
1566                         Fork = False;
1567                         break;
1568                 case OPT_FORK:
1569                         Fork = false;
1570                         break;
1571                 case OPT_NO_PROCESS_GROUP:
1572                         no_process_group = true;
1573                         break;
1574                 case OPT_LOG_STDOUT:
1575                         log_stdout = true;
1576                         break;
1577                 case 'n':
1578                         opt_nocache = true;
1579                         break;
1580                 default:
1581                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1582                                   poptBadOption(pc, 0), poptStrerror(opt));
1583                         poptPrintUsage(pc, stderr, 0);
1584                         exit(1);
1585                 }
1586         }
1587
1588         /* We call dump_core_setup one more time because the command line can
1589          * set the log file or the log-basename and this will influence where
1590          * cores are stored. Without this call get_dyn_LOGFILEBASE will be
1591          * the default value derived from build's prefix. For EOM this value
1592          * is often not related to the path where winbindd is actually run
1593          * in production.
1594          */
1595         dump_core_setup("winbindd", lp_logfile(talloc_tos()));
1596         if (is_daemon && interactive) {
1597                 d_fprintf(stderr,"\nERROR: "
1598                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1599                 poptPrintUsage(pc, stderr, 0);
1600                 exit(1);
1601         }
1602
1603         if (log_stdout && Fork) {
1604                 d_fprintf(stderr, "\nERROR: "
1605                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1606                 poptPrintUsage(pc, stderr, 0);
1607                 exit(1);
1608         }
1609
1610         poptFreeContext(pc);
1611
1612         if (!override_logfile) {
1613                 char *lfile = NULL;
1614                 if (asprintf(&lfile,"%s/log.winbindd",
1615                                 get_dyn_LOGFILEBASE()) > 0) {
1616                         lp_set_logfile(lfile);
1617                         SAFE_FREE(lfile);
1618                 }
1619         }
1620
1621         if (log_stdout) {
1622                 setup_logging("winbindd", DEBUG_STDOUT);
1623         } else {
1624                 setup_logging("winbindd", DEBUG_FILE);
1625         }
1626         reopen_logs();
1627
1628         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1629         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1630
1631         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1632                 DEBUG(0, ("error opening config file '%s'\n", get_dyn_CONFIGFILE()));
1633                 exit(1);
1634         }
1635         /* After parsing the configuration file we setup the core path one more time
1636          * as the log file might have been set in the configuration and cores's
1637          * path is by default basename(lp_logfile()).
1638          */
1639         dump_core_setup("winbindd", lp_logfile(talloc_tos()));
1640
1641         if (lp_server_role() == ROLE_ACTIVE_DIRECTORY_DC
1642             && !lp_parm_bool(-1, "server role check", "inhibit", false)) {
1643                 DEBUG(0, ("server role = 'active directory domain controller' not compatible with running the winbindd binary. \n"));
1644                 DEBUGADD(0, ("You should start 'samba' instead, and it will control starting the internal AD DC winbindd implementation, which is not the same as this one\n"));
1645                 exit(1);
1646         }
1647
1648         if (!cluster_probe_ok()) {
1649                 exit(1);
1650         }
1651
1652         /* Initialise messaging system */
1653
1654         if (server_messaging_context() == NULL) {
1655                 exit(1);
1656         }
1657
1658         if (!reload_services_file(NULL)) {
1659                 DEBUG(0, ("error opening config file\n"));
1660                 exit(1);
1661         }
1662
1663         {
1664                 size_t i;
1665                 const char *idmap_backend;
1666                 const char *invalid_backends[] = {
1667                         "ad", "rfc2307", "rid",
1668                 };
1669
1670                 idmap_backend = lp_idmap_default_backend();
1671                 for (i = 0; i < ARRAY_SIZE(invalid_backends); i++) {
1672                         ok = strequal(idmap_backend, invalid_backends[i]);
1673                         if (ok) {
1674                                 DBG_ERR("FATAL: Invalid idmap backend %s "
1675                                         "configured as the default backend!\n",
1676                                         idmap_backend);
1677                                 exit(1);
1678                         }
1679                 }
1680         }
1681
1682         ok = directory_create_or_exist(lp_lock_directory(), 0755);
1683         if (!ok) {
1684                 DEBUG(0, ("Failed to create directory %s for lock files - %s\n",
1685                           lp_lock_directory(), strerror(errno)));
1686                 exit(1);
1687         }
1688
1689         ok = directory_create_or_exist(lp_pid_directory(), 0755);
1690         if (!ok) {
1691                 DEBUG(0, ("Failed to create directory %s for pid files - %s\n",
1692                           lp_pid_directory(), strerror(errno)));
1693                 exit(1);
1694         }
1695
1696         /* Setup names. */
1697
1698         if (!init_names())
1699                 exit(1);
1700
1701         load_interfaces();
1702
1703         if (!secrets_init()) {
1704
1705                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1706                 return False;
1707         }
1708
1709         status = rpccli_pre_open_netlogon_creds();
1710         if (!NT_STATUS_IS_OK(status)) {
1711                 DEBUG(0, ("rpccli_pre_open_netlogon_creds() - %s\n",
1712                           nt_errstr(status)));
1713                 exit(1);
1714         }
1715
1716         /* Unblock all signals we are interested in as they may have been
1717            blocked by the parent process. */
1718
1719         BlockSignals(False, SIGINT);
1720         BlockSignals(False, SIGQUIT);
1721         BlockSignals(False, SIGTERM);
1722         BlockSignals(False, SIGUSR1);
1723         BlockSignals(False, SIGUSR2);
1724         BlockSignals(False, SIGHUP);
1725         BlockSignals(False, SIGCHLD);
1726
1727         if (!interactive)
1728                 become_daemon(Fork, no_process_group, log_stdout);
1729
1730         pidfile_create(lp_pid_directory(), "winbindd");
1731
1732 #if HAVE_SETPGID
1733         /*
1734          * If we're interactive we want to set our own process group for
1735          * signal management.
1736          */
1737         if (interactive && !no_process_group)
1738                 setpgid( (pid_t)0, (pid_t)0);
1739 #endif
1740
1741         TimeInit();
1742
1743         /* Don't use winbindd_reinit_after_fork here as
1744          * we're just starting up and haven't created any
1745          * winbindd-specific resources we must free yet. JRA.
1746          */
1747
1748         status = reinit_after_fork(server_messaging_context(),
1749                                    server_event_context(),
1750                                    false, NULL);
1751         if (!NT_STATUS_IS_OK(status)) {
1752                 exit_daemon("Winbindd reinit_after_fork() failed", map_errno_from_nt_status(status));
1753         }
1754
1755         /*
1756          * Do not initialize the parent-child-pipe before becoming
1757          * a daemon: this is used to detect a died parent in the child
1758          * process.
1759          */
1760         status = init_before_fork();
1761         if (!NT_STATUS_IS_OK(status)) {
1762                 exit_daemon(nt_errstr(status), map_errno_from_nt_status(status));
1763         }
1764
1765         winbindd_register_handlers(server_messaging_context(), !Fork);
1766
1767         if (!messaging_parent_dgm_cleanup_init(server_messaging_context())) {
1768                 exit(1);
1769         }
1770
1771         status = init_system_session_info();
1772         if (!NT_STATUS_IS_OK(status)) {
1773                 exit_daemon("Winbindd failed to setup system user info", map_errno_from_nt_status(status));
1774         }
1775
1776         rpc_lsarpc_init(NULL);
1777         rpc_samr_init(NULL);
1778
1779         winbindd_init_addrchange(NULL, server_event_context(),
1780                                  server_messaging_context());
1781
1782         /* setup listen sockets */
1783
1784         if (!winbindd_setup_listeners()) {
1785                 exit_daemon("Winbindd failed to setup listeners", EPIPE);
1786         }
1787
1788         irpc_add_name(winbind_imessaging_context(), "winbind_server");
1789
1790         TALLOC_FREE(frame);
1791
1792         if (!interactive) {
1793                 daemon_ready("winbindd");
1794         }
1795
1796         gpupdate_init();
1797
1798         /* Loop waiting for requests */
1799         while (1) {
1800                 frame = talloc_stackframe();
1801
1802                 if (tevent_loop_once(server_event_context()) == -1) {
1803                         DEBUG(1, ("tevent_loop_once() failed: %s\n",
1804                                   strerror(errno)));
1805                         return 1;
1806                 }
1807
1808                 TALLOC_FREE(frame);
1809         }
1810
1811         return 0;
1812 }