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 "idmap.h"
  35 #include "lib/addrchange.h"
  36 #include "serverid.h"
  37 #include "auth.h"
  38 #include "messages.h"
  39 #include "../lib/util/pidfile.h"
  40
  41 #undef DBGC_CLASS
  42 #define DBGC_CLASS DBGC_WINBIND
  43
  44 static bool client_is_idle(struct winbindd_cli_state *state);
  45 static void remove_client(struct winbindd_cli_state *state);
  46
  47 static bool opt_nocache = False;
  48 static bool interactive = False;
  49
  50 extern bool override_logfile;
  51
  52 struct tevent_context *winbind_event_context(void)
  53 {
  54         static struct tevent_context *ev = NULL;
  55
  56         if (ev != NULL) {
  57                 return ev;
  58         }
  59
  60         /*
  61          * Note we MUST use the NULL context here, not the autofree context,
  62          * to avoid side effects in forked children exiting.
  63          */
  64         ev = samba_tevent_context_init(NULL);
  65         if (ev == NULL) {
  66                 smb_panic("Could not init winbindd's messaging context.\n");
  67         }
  68         return ev;
  69 }
  70
  71 struct messaging_context *winbind_messaging_context(void)
  72 {
  73         static struct messaging_context *msg = NULL;
  74
  75         if (msg != NULL) {
  76                 return msg;
  77         }
  78
  79         /*
  80          * Note we MUST use the NULL context here, not the autofree context,
  81          * to avoid side effects in forked children exiting.
  82          */
  83         msg = messaging_init(NULL, winbind_event_context());
  84         if (msg == NULL) {
  85                 smb_panic("Could not init winbindd's messaging context.\n");
  86         }
  87         return msg;
  88 }
  89
  90 /* Reload configuration */
  91
  92 static bool reload_services_file(const char *lfile)
  93 {
  94         bool ret;
  95
  96         if (lp_loaded()) {
  97                 char *fname = lp_configfile(talloc_tos());
  98
  99                 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
 100                         set_dyn_CONFIGFILE(fname);
 101                 }
 102                 TALLOC_FREE(fname);
 103         }
 104
 105         /* if this is a child, restore the logfile to the special
 106            name - <domain>, idmap, etc. */
 107         if (lfile && *lfile) {
 108                 lp_set_logfile(lfile);
 109         }
 110
 111         reopen_logs();
 112         ret = lp_load_global(get_dyn_CONFIGFILE());
 113
 114         reopen_logs();
 115         load_interfaces();
 116
 117         return(ret);
 118 }
 119
 120
 121 static void winbindd_status(void)
 122 {
 123         struct winbindd_cli_state *tmp;
 124
 125         DEBUG(0, ("winbindd status:\n"));
 126
 127         /* Print client state information */
 128
 129         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
 130
 131         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
 132                 DEBUG(2, ("\tclient list:\n"));
 133                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
 134                         DEBUGADD(2, ("\t\tpid %lu, sock %d (%s)\n",
 135                                      (unsigned long)tmp->pid, tmp->sock,
 136                                      client_is_idle(tmp) ? "idle" : "active"));
 137                 }
 138         }
 139 }
 140
 141 /* Flush client cache */
 142
 143 static void flush_caches(void)
 144 {
 145         /* We need to invalidate cached user list entries on a SIGHUP
 146            otherwise cached access denied errors due to restrict anonymous
 147            hang around until the sequence number changes. */
 148
 149         if (!wcache_invalidate_cache()) {
 150                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 151                 if (!winbindd_cache_validate_and_initialize()) {
 152                         exit(1);
 153                 }
 154         }
 155 }
 156
 157 static void flush_caches_noinit(void)
 158 {
 159         /*
 160          * We need to invalidate cached user list entries on a SIGHUP
 161          * otherwise cached access denied errors due to restrict anonymous
 162          * hang around until the sequence number changes.
 163          * NB
 164          * Skip uninitialized domains when flush cache.
 165          * If domain is not initialized, it means it is never
 166          * used or never become online. look, wcache_invalidate_cache()
 167          * -> get_cache() -> init_dc_connection(). It causes a lot of traffic
 168          * for unused domains and large traffic for primay domain's DC if there
 169          * are many domains..
 170          */
 171
 172         if (!wcache_invalidate_cache_noinit()) {
 173                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 174                 if (!winbindd_cache_validate_and_initialize()) {
 175                         exit(1);
 176                 }
 177         }
 178 }
 179
 180 /* Handle the signal by unlinking socket and exiting */
 181
 182 static void terminate(bool is_parent)
 183 {
 184         if (is_parent) {
 185                 /* When parent goes away we should
 186                  * remove the socket file. Not so
 187                  * when children terminate.
 188                  */
 189                 char *path = NULL;
 190
 191                 if (asprintf(&path, "%s/%s",
 192                         get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
 193                         unlink(path);
 194                         SAFE_FREE(path);
 195                 }
 196         }
 197
 198         idmap_close();
 199
 200         trustdom_cache_shutdown();
 201
 202         gencache_stabilize();
 203
 204 #if 0
 205         if (interactive) {
 206                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 207                 char *description = talloc_describe_all(mem_ctx);
 208
 209                 DEBUG(3, ("tallocs left:\n%s\n", description));
 210                 talloc_destroy(mem_ctx);
 211         }
 212 #endif
 213
 214         if (is_parent) {
 215                 serverid_deregister(procid_self());
 216                 pidfile_unlink(lp_piddir(), "winbindd");
 217         }
 218
 219         exit(0);
 220 }
 221
 222 static void winbindd_sig_term_handler(struct tevent_context *ev,
 223                                       struct tevent_signal *se,
 224                                       int signum,
 225                                       int count,
 226                                       void *siginfo,
 227                                       void *private_data)
 228 {
 229         bool *is_parent = talloc_get_type_abort(private_data, bool);
 230
 231         DEBUG(0,("Got sig[%d] terminate (is_parent=%d)\n",
 232                  signum, (int)*is_parent));
 233         terminate(*is_parent);
 234 }
 235
 236 /*
 237   handle stdin becoming readable when we are in --foreground mode
 238  */
 239 static void winbindd_stdin_handler(struct tevent_context *ev,
 240                                struct tevent_fd *fde,
 241                                uint16_t flags,
 242                                void *private_data)
 243 {
 244         char c;
 245         if (read(0, &c, 1) != 1) {
 246                 bool *is_parent = talloc_get_type_abort(private_data, bool);
 247
 248                 /* we have reached EOF on stdin, which means the
 249                    parent has exited. Shutdown the server */
 250                 DEBUG(0,("EOF on stdin (is_parent=%d)\n",
 251                          (int)*is_parent));
 252                 terminate(*is_parent);
 253         }
 254 }
 255
 256 bool winbindd_setup_sig_term_handler(bool parent)
 257 {
 258         struct tevent_signal *se;
 259         bool *is_parent;
 260
 261         is_parent = talloc(winbind_event_context(), bool);
 262         if (!is_parent) {
 263                 return false;
 264         }
 265
 266         *is_parent = parent;
 267
 268         se = tevent_add_signal(winbind_event_context(),
 269                                is_parent,
 270                                SIGTERM, 0,
 271                                winbindd_sig_term_handler,
 272                                is_parent);
 273         if (!se) {
 274                 DEBUG(0,("failed to setup SIGTERM handler"));
 275                 talloc_free(is_parent);
 276                 return false;
 277         }
 278
 279         se = tevent_add_signal(winbind_event_context(),
 280                                is_parent,
 281                                SIGINT, 0,
 282                                winbindd_sig_term_handler,
 283                                is_parent);
 284         if (!se) {
 285                 DEBUG(0,("failed to setup SIGINT handler"));
 286                 talloc_free(is_parent);
 287                 return false;
 288         }
 289
 290         se = tevent_add_signal(winbind_event_context(),
 291                                is_parent,
 292                                SIGQUIT, 0,
 293                                winbindd_sig_term_handler,
 294                                is_parent);
 295         if (!se) {
 296                 DEBUG(0,("failed to setup SIGINT handler"));
 297                 talloc_free(is_parent);
 298                 return false;
 299         }
 300
 301         return true;
 302 }
 303
 304 bool winbindd_setup_stdin_handler(bool parent, bool foreground)
 305 {
 306         bool *is_parent;
 307
 308         if (foreground) {
 309                 is_parent = talloc(winbind_event_context(), bool);
 310                 if (!is_parent) {
 311                         return false;
 312                 }
 313
 314                 *is_parent = parent;
 315
 316                 /* if we are running in the foreground then look for
 317                    EOF on stdin, and exit if it happens. This allows
 318                    us to die if the parent process dies
 319                 */
 320                 tevent_add_fd(winbind_event_context(), is_parent, 0, TEVENT_FD_READ, winbindd_stdin_handler, is_parent);
 321         }
 322
 323         return true;
 324 }
 325
 326 static void winbindd_sig_hup_handler(struct tevent_context *ev,
 327                                      struct tevent_signal *se,
 328                                      int signum,
 329                                      int count,
 330                                      void *siginfo,
 331                                      void *private_data)
 332 {
 333         const char *file = (const char *)private_data;
 334
 335         DEBUG(1,("Reloading services after SIGHUP\n"));
 336         flush_caches_noinit();
 337         reload_services_file(file);
 338 }
 339
 340 bool winbindd_setup_sig_hup_handler(const char *lfile)
 341 {
 342         struct tevent_signal *se;
 343         char *file = NULL;
 344
 345         if (lfile) {
 346                 file = talloc_strdup(winbind_event_context(),
 347                                      lfile);
 348                 if (!file) {
 349                         return false;
 350                 }
 351         }
 352
 353         se = tevent_add_signal(winbind_event_context(),
 354                                winbind_event_context(),
 355                                SIGHUP, 0,
 356                                winbindd_sig_hup_handler,
 357                                file);
 358         if (!se) {
 359                 return false;
 360         }
 361
 362         return true;
 363 }
 364
 365 static void winbindd_sig_chld_handler(struct tevent_context *ev,
 366                                       struct tevent_signal *se,
 367                                       int signum,
 368                                       int count,
 369                                       void *siginfo,
 370                                       void *private_data)
 371 {
 372         pid_t pid;
 373
 374         while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 375                 winbind_child_died(pid);
 376         }
 377 }
 378
 379 static bool winbindd_setup_sig_chld_handler(void)
 380 {
 381         struct tevent_signal *se;
 382
 383         se = tevent_add_signal(winbind_event_context(),
 384                                winbind_event_context(),
 385                                SIGCHLD, 0,
 386                                winbindd_sig_chld_handler,
 387                                NULL);
 388         if (!se) {
 389                 return false;
 390         }
 391
 392         return true;
 393 }
 394
 395 static void winbindd_sig_usr2_handler(struct tevent_context *ev,
 396                                       struct tevent_signal *se,
 397                                       int signum,
 398                                       int count,
 399                                       void *siginfo,
 400                                       void *private_data)
 401 {
 402         winbindd_status();
 403 }
 404
 405 static bool winbindd_setup_sig_usr2_handler(void)
 406 {
 407         struct tevent_signal *se;
 408
 409         se = tevent_add_signal(winbind_event_context(),
 410                                winbind_event_context(),
 411                                SIGUSR2, 0,
 412                                winbindd_sig_usr2_handler,
 413                                NULL);
 414         if (!se) {
 415                 return false;
 416         }
 417
 418         return true;
 419 }
 420
 421 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 422 static void msg_reload_services(struct messaging_context *msg,
 423                                 void *private_data,
 424                                 uint32_t msg_type,
 425                                 struct server_id server_id,
 426                                 DATA_BLOB *data)
 427 {
 428         /* Flush various caches */
 429         flush_caches();
 430         reload_services_file((const char *) private_data);
 431 }
 432
 433 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 434 static void msg_shutdown(struct messaging_context *msg,
 435                          void *private_data,
 436                          uint32_t msg_type,
 437                          struct server_id server_id,
 438                          DATA_BLOB *data)
 439 {
 440         /* only the parent waits for this message */
 441         DEBUG(0,("Got shutdown message\n"));
 442         terminate(true);
 443 }
 444
 445
 446 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
 447                                        void *private_data,
 448                                        uint32_t msg_type,
 449                                        struct server_id server_id,
 450                                        DATA_BLOB *data)
 451 {
 452         uint8 ret;
 453         pid_t child_pid;
 454         NTSTATUS status;
 455
 456         DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
 457                    "message.\n"));
 458
 459         /*
 460          * call the validation code from a child:
 461          * so we don't block the main winbindd and the validation
 462          * code can safely use fork/waitpid...
 463          */
 464         child_pid = fork();
 465
 466         if (child_pid == -1) {
 467                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
 468                           strerror(errno)));
 469                 return;
 470         }
 471
 472         if (child_pid != 0) {
 473                 /* parent */
 474                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
 475                           "pid %d.\n", (int)child_pid));
 476                 return;
 477         }
 478
 479         /* child */
 480
 481         status = winbindd_reinit_after_fork(NULL, NULL);
 482         if (!NT_STATUS_IS_OK(status)) {
 483                 DEBUG(1, ("winbindd_reinit_after_fork failed: %s\n",
 484                           nt_errstr(status)));
 485                 _exit(0);
 486         }
 487
 488         /* install default SIGCHLD handler: validation code uses fork/waitpid */
 489         CatchSignal(SIGCHLD, SIG_DFL);
 490
 491         ret = (uint8)winbindd_validate_cache_nobackup();
 492         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
 493         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
 494                            (size_t)1);
 495         _exit(0);
 496 }
 497
 498 static struct winbindd_dispatch_table {
 499         enum winbindd_cmd cmd;
 500         void (*fn)(struct winbindd_cli_state *state);
 501         const char *winbindd_cmd_name;
 502 } dispatch_table[] = {
 503
 504         /* Enumeration functions */
 505
 506         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 507           "LIST_TRUSTDOM" },
 508
 509         /* Miscellaneous */
 510
 511         { WINBINDD_INFO, winbindd_info, "INFO" },
 512         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 513           "INTERFACE_VERSION" },
 514         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 515         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 516         { WINBINDD_DC_INFO, winbindd_dc_info, "DC_INFO" },
 517         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 518         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 519           "WINBINDD_PRIV_PIPE_DIR" },
 520
 521         /* Credential cache access */
 522         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 523         { WINBINDD_CCACHE_SAVE, winbindd_ccache_save, "CCACHE_SAVE" },
 524
 525         /* End of list */
 526
 527         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 528 };
 529
 530 struct winbindd_async_dispatch_table {
 531         enum winbindd_cmd cmd;
 532         const char *cmd_name;
 533         struct tevent_req *(*send_req)(TALLOC_CTX *mem_ctx,
 534                                        struct tevent_context *ev,
 535                                        struct winbindd_cli_state *cli,
 536                                        struct winbindd_request *request);
 537         NTSTATUS (*recv_req)(struct tevent_req *req,
 538                              struct winbindd_response *presp);
 539 };
 540
 541 static struct winbindd_async_dispatch_table async_nonpriv_table[] = {
 542         { WINBINDD_PING, "PING",
 543           wb_ping_send, wb_ping_recv },
 544         { WINBINDD_LOOKUPSID, "LOOKUPSID",
 545           winbindd_lookupsid_send, winbindd_lookupsid_recv },
 546         { WINBINDD_LOOKUPSIDS, "LOOKUPSIDS",
 547           winbindd_lookupsids_send, winbindd_lookupsids_recv },
 548         { WINBINDD_LOOKUPNAME, "LOOKUPNAME",
 549           winbindd_lookupname_send, winbindd_lookupname_recv },
 550         { WINBINDD_SID_TO_UID, "SID_TO_UID",
 551           winbindd_sid_to_uid_send, winbindd_sid_to_uid_recv },
 552         { WINBINDD_SID_TO_GID, "SID_TO_GID",
 553           winbindd_sid_to_gid_send, winbindd_sid_to_gid_recv },
 554         { WINBINDD_UID_TO_SID, "UID_TO_SID",
 555           winbindd_uid_to_sid_send, winbindd_uid_to_sid_recv },
 556         { WINBINDD_GID_TO_SID, "GID_TO_SID",
 557           winbindd_gid_to_sid_send, winbindd_gid_to_sid_recv },
 558         { WINBINDD_SIDS_TO_XIDS, "SIDS_TO_XIDS",
 559           winbindd_sids_to_xids_send, winbindd_sids_to_xids_recv },
 560         { WINBINDD_GETPWSID, "GETPWSID",
 561           winbindd_getpwsid_send, winbindd_getpwsid_recv },
 562         { WINBINDD_GETPWNAM, "GETPWNAM",
 563           winbindd_getpwnam_send, winbindd_getpwnam_recv },
 564         { WINBINDD_GETPWUID, "GETPWUID",
 565           winbindd_getpwuid_send, winbindd_getpwuid_recv },
 566         { WINBINDD_GETSIDALIASES, "GETSIDALIASES",
 567           winbindd_getsidaliases_send, winbindd_getsidaliases_recv },
 568         { WINBINDD_GETUSERDOMGROUPS, "GETUSERDOMGROUPS",
 569           winbindd_getuserdomgroups_send, winbindd_getuserdomgroups_recv },
 570         { WINBINDD_GETGROUPS, "GETGROUPS",
 571           winbindd_getgroups_send, winbindd_getgroups_recv },
 572         { WINBINDD_SHOW_SEQUENCE, "SHOW_SEQUENCE",
 573           winbindd_show_sequence_send, winbindd_show_sequence_recv },
 574         { WINBINDD_GETGRGID, "GETGRGID",
 575           winbindd_getgrgid_send, winbindd_getgrgid_recv },
 576         { WINBINDD_GETGRNAM, "GETGRNAM",
 577           winbindd_getgrnam_send, winbindd_getgrnam_recv },
 578         { WINBINDD_GETUSERSIDS, "GETUSERSIDS",
 579           winbindd_getusersids_send, winbindd_getusersids_recv },
 580         { WINBINDD_LOOKUPRIDS, "LOOKUPRIDS",
 581           winbindd_lookuprids_send, winbindd_lookuprids_recv },
 582         { WINBINDD_SETPWENT, "SETPWENT",
 583           winbindd_setpwent_send, winbindd_setpwent_recv },
 584         { WINBINDD_GETPWENT, "GETPWENT",
 585           winbindd_getpwent_send, winbindd_getpwent_recv },
 586         { WINBINDD_ENDPWENT, "ENDPWENT",
 587           winbindd_endpwent_send, winbindd_endpwent_recv },
 588         { WINBINDD_DSGETDCNAME, "DSGETDCNAME",
 589           winbindd_dsgetdcname_send, winbindd_dsgetdcname_recv },
 590         { WINBINDD_GETDCNAME, "GETDCNAME",
 591           winbindd_getdcname_send, winbindd_getdcname_recv },
 592         { WINBINDD_SETGRENT, "SETGRENT",
 593           winbindd_setgrent_send, winbindd_setgrent_recv },
 594         { WINBINDD_GETGRENT, "GETGRENT",
 595           winbindd_getgrent_send, winbindd_getgrent_recv },
 596         { WINBINDD_ENDGRENT, "ENDGRENT",
 597           winbindd_endgrent_send, winbindd_endgrent_recv },
 598         { WINBINDD_LIST_USERS, "LIST_USERS",
 599           winbindd_list_users_send, winbindd_list_users_recv },
 600         { WINBINDD_LIST_GROUPS, "LIST_GROUPS",
 601           winbindd_list_groups_send, winbindd_list_groups_recv },
 602         { WINBINDD_CHECK_MACHACC, "CHECK_MACHACC",
 603           winbindd_check_machine_acct_send, winbindd_check_machine_acct_recv },
 604         { WINBINDD_PING_DC, "PING_DC",
 605           winbindd_ping_dc_send, winbindd_ping_dc_recv },
 606         { WINBINDD_PAM_AUTH, "PAM_AUTH",
 607           winbindd_pam_auth_send, winbindd_pam_auth_recv },
 608         { WINBINDD_PAM_LOGOFF, "PAM_LOGOFF",
 609           winbindd_pam_logoff_send, winbindd_pam_logoff_recv },
 610         { WINBINDD_PAM_CHAUTHTOK, "PAM_CHAUTHTOK",
 611           winbindd_pam_chauthtok_send, winbindd_pam_chauthtok_recv },
 612         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, "PAM_CHNG_PSWD_AUTH_CRAP",
 613           winbindd_pam_chng_pswd_auth_crap_send,
 614           winbindd_pam_chng_pswd_auth_crap_recv },
 615         { WINBINDD_WINS_BYIP, "WINS_BYIP",
 616           winbindd_wins_byip_send, winbindd_wins_byip_recv },
 617         { WINBINDD_WINS_BYNAME, "WINS_BYNAME",
 618           winbindd_wins_byname_send, winbindd_wins_byname_recv },
 619
 620         { 0, NULL, NULL, NULL }
 621 };
 622
 623 static struct winbindd_async_dispatch_table async_priv_table[] = {
 624         { WINBINDD_ALLOCATE_UID, "ALLOCATE_UID",
 625           winbindd_allocate_uid_send, winbindd_allocate_uid_recv },
 626         { WINBINDD_ALLOCATE_GID, "ALLOCATE_GID",
 627           winbindd_allocate_gid_send, winbindd_allocate_gid_recv },
 628         { WINBINDD_CHANGE_MACHACC, "CHANGE_MACHACC",
 629           winbindd_change_machine_acct_send, winbindd_change_machine_acct_recv },
 630         { WINBINDD_PAM_AUTH_CRAP, "PAM_AUTH_CRAP",
 631           winbindd_pam_auth_crap_send, winbindd_pam_auth_crap_recv },
 632
 633         { 0, NULL, NULL, NULL }
 634 };
 635
 636 static void wb_request_done(struct tevent_req *req);
 637
 638 static void process_request(struct winbindd_cli_state *state)
 639 {
 640         struct winbindd_dispatch_table *table = dispatch_table;
 641         struct winbindd_async_dispatch_table *atable;
 642
 643         state->mem_ctx = talloc_named(state, 0, "winbind request");
 644         if (state->mem_ctx == NULL)
 645                 return;
 646
 647         /* Remember who asked us. */
 648         state->pid = state->request->pid;
 649
 650         state->cmd_name = "unknown request";
 651         state->recv_fn = NULL;
 652         state->last_access = time(NULL);
 653
 654         /* Process command */
 655
 656         for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
 657                 if (state->request->cmd == atable->cmd) {
 658                         break;
 659                 }
 660         }
 661
 662         if ((atable->send_req == NULL) && state->privileged) {
 663                 for (atable = async_priv_table; atable->send_req;
 664                      atable += 1) {
 665                         if (state->request->cmd == atable->cmd) {
 666                                 break;
 667                         }
 668                 }
 669         }
 670
 671         if (atable->send_req != NULL) {
 672                 struct tevent_req *req;
 673
 674                 state->cmd_name = atable->cmd_name;
 675                 state->recv_fn = atable->recv_req;
 676
 677                 DEBUG(10, ("process_request: Handling async request %d:%s\n",
 678                            (int)state->pid, state->cmd_name));
 679
 680                 req = atable->send_req(state->mem_ctx, winbind_event_context(),
 681                                        state, state->request);
 682                 if (req == NULL) {
 683                         DEBUG(0, ("process_request: atable->send failed for "
 684                                   "%s\n", atable->cmd_name));
 685                         request_error(state);
 686                         return;
 687                 }
 688                 tevent_req_set_callback(req, wb_request_done, state);
 689                 return;
 690         }
 691
 692         state->response = talloc_zero(state->mem_ctx,
 693                                       struct winbindd_response);
 694         if (state->response == NULL) {
 695                 DEBUG(10, ("talloc failed\n"));
 696                 remove_client(state);
 697                 return;
 698         }
 699         state->response->result = WINBINDD_PENDING;
 700         state->response->length = sizeof(struct winbindd_response);
 701
 702         for (table = dispatch_table; table->fn; table++) {
 703                 if (state->request->cmd == table->cmd) {
 704                         DEBUG(10,("process_request: request fn %s\n",
 705                                   table->winbindd_cmd_name ));
 706                         state->cmd_name = table->winbindd_cmd_name;
 707                         table->fn(state);
 708                         break;
 709                 }
 710         }
 711
 712         if (!table->fn) {
 713                 DEBUG(10,("process_request: unknown request fn number %d\n",
 714                           (int)state->request->cmd ));
 715                 request_error(state);
 716         }
 717 }
 718
 719 static void wb_request_done(struct tevent_req *req)
 720 {
 721         struct winbindd_cli_state *state = tevent_req_callback_data(
 722                 req, struct winbindd_cli_state);
 723         NTSTATUS status;
 724
 725         state->response = talloc_zero(state->mem_ctx,
 726                                       struct winbindd_response);
 727         if (state->response == NULL) {
 728                 DEBUG(0, ("wb_request_done[%d:%s]: talloc_zero failed - removing client\n",
 729                           (int)state->pid, state->cmd_name));
 730                 remove_client(state);
 731                 return;
 732         }
 733         state->response->result = WINBINDD_PENDING;
 734         state->response->length = sizeof(struct winbindd_response);
 735
 736         status = state->recv_fn(req, state->response);
 737         TALLOC_FREE(req);
 738
 739         DEBUG(10,("wb_request_done[%d:%s]: %s\n",
 740                   (int)state->pid, state->cmd_name, nt_errstr(status)));
 741
 742         if (!NT_STATUS_IS_OK(status)) {
 743                 request_error(state);
 744                 return;
 745         }
 746         request_ok(state);
 747 }
 748
 749 /*
 750  * This is the main event loop of winbind requests. It goes through a
 751  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 752  *
 753  * An idle winbind client has a read request of 4 bytes outstanding,
 754  * finalizing function is request_len_recv, checking the length. request_recv
 755  * then processes the packet. The processing function then at some point has
 756  * to call request_finished which schedules sending the response.
 757  */
 758
 759 static void request_finished(struct winbindd_cli_state *state);
 760
 761 static void winbind_client_request_read(struct tevent_req *req);
 762 static void winbind_client_response_written(struct tevent_req *req);
 763
 764 static void request_finished(struct winbindd_cli_state *state)
 765 {
 766         struct tevent_req *req;
 767
 768         TALLOC_FREE(state->request);
 769
 770         req = wb_resp_write_send(state, winbind_event_context(),
 771                                  state->out_queue, state->sock,
 772                                  state->response);
 773         if (req == NULL) {
 774                 DEBUG(10,("request_finished[%d:%s]: wb_resp_write_send() failed\n",
 775                           (int)state->pid, state->cmd_name));
 776                 remove_client(state);
 777                 return;
 778         }
 779         tevent_req_set_callback(req, winbind_client_response_written, state);
 780 }
 781
 782 static void winbind_client_response_written(struct tevent_req *req)
 783 {
 784         struct winbindd_cli_state *state = tevent_req_callback_data(
 785                 req, struct winbindd_cli_state);
 786         ssize_t ret;
 787         int err;
 788
 789         ret = wb_resp_write_recv(req, &err);
 790         TALLOC_FREE(req);
 791         if (ret == -1) {
 792                 close(state->sock);
 793                 state->sock = -1;
 794                 DEBUG(2, ("Could not write response[%d:%s] to client: %s\n",
 795                           (int)state->pid, state->cmd_name, strerror(err)));
 796                 remove_client(state);
 797                 return;
 798         }
 799
 800         DEBUG(10,("winbind_client_response_written[%d:%s]: delivered response "
 801                   "to client\n", (int)state->pid, state->cmd_name));
 802
 803         TALLOC_FREE(state->mem_ctx);
 804         state->response = NULL;
 805         state->cmd_name = "no request";
 806         state->recv_fn = NULL;
 807
 808         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 809                                WINBINDD_MAX_EXTRA_DATA);
 810         if (req == NULL) {
 811                 remove_client(state);
 812                 return;
 813         }
 814         tevent_req_set_callback(req, winbind_client_request_read, state);
 815 }
 816
 817 void request_error(struct winbindd_cli_state *state)
 818 {
 819         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 820         state->response->result = WINBINDD_ERROR;
 821         request_finished(state);
 822 }
 823
 824 void request_ok(struct winbindd_cli_state *state)
 825 {
 826         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 827         state->response->result = WINBINDD_OK;
 828         request_finished(state);
 829 }
 830
 831 /* Process a new connection by adding it to the client connection list */
 832
 833 static void new_connection(int listen_sock, bool privileged)
 834 {
 835         struct sockaddr_un sunaddr;
 836         struct winbindd_cli_state *state;
 837         struct tevent_req *req;
 838         socklen_t len;
 839         int sock;
 840
 841         /* Accept connection */
 842
 843         len = sizeof(sunaddr);
 844
 845         sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr, &len);
 846
 847         if (sock == -1) {
 848                 if (errno != EINTR) {
 849                         DEBUG(0, ("Failed to accept socket - %s\n",
 850                                   strerror(errno)));
 851                 }
 852                 return;
 853         }
 854
 855         DEBUG(6,("accepted socket %d\n", sock));
 856
 857         /* Create new connection structure */
 858
 859         if ((state = talloc_zero(NULL, struct winbindd_cli_state)) == NULL) {
 860                 close(sock);
 861                 return;
 862         }
 863
 864         state->sock = sock;
 865
 866         state->out_queue = tevent_queue_create(state, "winbind client reply");
 867         if (state->out_queue == NULL) {
 868                 close(sock);
 869                 TALLOC_FREE(state);
 870                 return;
 871         }
 872
 873         state->last_access = time(NULL);
 874
 875         state->privileged = privileged;
 876
 877         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 878                                WINBINDD_MAX_EXTRA_DATA);
 879         if (req == NULL) {
 880                 TALLOC_FREE(state);
 881                 close(sock);
 882                 return;
 883         }
 884         tevent_req_set_callback(req, winbind_client_request_read, state);
 885
 886         /* Add to connection list */
 887
 888         winbindd_add_client(state);
 889 }
 890
 891 static void winbind_client_request_read(struct tevent_req *req)
 892 {
 893         struct winbindd_cli_state *state = tevent_req_callback_data(
 894                 req, struct winbindd_cli_state);
 895         ssize_t ret;
 896         int err;
 897
 898         ret = wb_req_read_recv(req, state, &state->request, &err);
 899         TALLOC_FREE(req);
 900         if (ret == -1) {
 901                 if (err == EPIPE) {
 902                         DEBUG(6, ("closing socket %d, client exited\n",
 903                                   state->sock));
 904                 } else {
 905                         DEBUG(2, ("Could not read client request from fd %d: "
 906                                   "%s\n", state->sock, strerror(err)));
 907                 }
 908                 close(state->sock);
 909                 state->sock = -1;
 910                 remove_client(state);
 911                 return;
 912         }
 913         process_request(state);
 914 }
 915
 916 /* Remove a client connection from client connection list */
 917
 918 static void remove_client(struct winbindd_cli_state *state)
 919 {
 920         char c = 0;
 921         int nwritten;
 922
 923         /* It's a dead client - hold a funeral */
 924
 925         if (state == NULL) {
 926                 return;
 927         }
 928
 929         if (state->sock != -1) {
 930                 /* tell client, we are closing ... */
 931                 nwritten = write(state->sock, &c, sizeof(c));
 932                 if (nwritten == -1) {
 933                         DEBUG(2, ("final write to client failed: %s\n",
 934                                 strerror(errno)));
 935                 }
 936
 937                 /* Close socket */
 938
 939                 close(state->sock);
 940                 state->sock = -1;
 941         }
 942
 943         TALLOC_FREE(state->mem_ctx);
 944
 945         /* Remove from list and free */
 946
 947         winbindd_remove_client(state);
 948         TALLOC_FREE(state);
 949 }
 950
 951 /* Is a client idle? */
 952
 953 static bool client_is_idle(struct winbindd_cli_state *state) {
 954   return (state->request == NULL &&
 955           state->response == NULL &&
 956           !state->pwent_state && !state->grent_state);
 957 }
 958
 959 /* Shutdown client connection which has been idle for the longest time */
 960
 961 static bool remove_idle_client(void)
 962 {
 963         struct winbindd_cli_state *state, *remove_state = NULL;
 964         time_t last_access = 0;
 965         int nidle = 0;
 966
 967         for (state = winbindd_client_list(); state; state = state->next) {
 968                 if (client_is_idle(state)) {
 969                         nidle++;
 970                         if (!last_access || state->last_access < last_access) {
 971                                 last_access = state->last_access;
 972                                 remove_state = state;
 973                         }
 974                 }
 975         }
 976
 977         if (remove_state) {
 978                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 979                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 980                 remove_client(remove_state);
 981                 return True;
 982         }
 983
 984         return False;
 985 }
 986
 987 struct winbindd_listen_state {
 988         bool privileged;
 989         int fd;
 990 };
 991
 992 static void winbindd_listen_fde_handler(struct tevent_context *ev,
 993                                         struct tevent_fd *fde,
 994                                         uint16_t flags,
 995                                         void *private_data)
 996 {
 997         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
 998                                           struct winbindd_listen_state);
 999
1000         while (winbindd_num_clients() > lp_winbind_max_clients() - 1) {
1001                 DEBUG(5,("winbindd: Exceeding %d client "
1002                          "connections, removing idle "
1003                          "connection.\n", lp_winbind_max_clients()));
1004                 if (!remove_idle_client()) {
1005                         DEBUG(0,("winbindd: Exceeding %d "
1006                                  "client connections, no idle "
1007                                  "connection found\n",
1008                                  lp_winbind_max_clients()));
1009                         break;
1010                 }
1011         }
1012         new_connection(s->fd, s->privileged);
1013 }
1014
1015 /*
1016  * Winbindd socket accessor functions
1017  */
1018
1019 const char *get_winbind_pipe_dir(void)
1020 {
1021         return lp_parm_const_string(-1, "winbindd", "socket dir", get_dyn_WINBINDD_SOCKET_DIR());
1022 }
1023
1024 char *get_winbind_priv_pipe_dir(void)
1025 {
1026         return state_path(WINBINDD_PRIV_SOCKET_SUBDIR);
1027 }
1028
1029 static bool winbindd_setup_listeners(void)
1030 {
1031         struct winbindd_listen_state *pub_state = NULL;
1032         struct winbindd_listen_state *priv_state = NULL;
1033         struct tevent_fd *fde;
1034         int rc;
1035
1036         pub_state = talloc(winbind_event_context(),
1037                            struct winbindd_listen_state);
1038         if (!pub_state) {
1039                 goto failed;
1040         }
1041
1042         pub_state->privileged = false;
1043         pub_state->fd = create_pipe_sock(
1044                 get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME, 0755);
1045         if (pub_state->fd == -1) {
1046                 goto failed;
1047         }
1048         rc = listen(pub_state->fd, 5);
1049         if (rc < 0) {
1050                 goto failed;
1051         }
1052
1053         fde = tevent_add_fd(winbind_event_context(), pub_state, pub_state->fd,
1054                             TEVENT_FD_READ, winbindd_listen_fde_handler,
1055                             pub_state);
1056         if (fde == NULL) {
1057                 close(pub_state->fd);
1058                 goto failed;
1059         }
1060         tevent_fd_set_auto_close(fde);
1061
1062         priv_state = talloc(winbind_event_context(),
1063                             struct winbindd_listen_state);
1064         if (!priv_state) {
1065                 goto failed;
1066         }
1067
1068         priv_state->privileged = true;
1069         priv_state->fd = create_pipe_sock(
1070                 get_winbind_priv_pipe_dir(), WINBINDD_SOCKET_NAME, 0750);
1071         if (priv_state->fd == -1) {
1072                 goto failed;
1073         }
1074         rc = listen(priv_state->fd, 5);
1075         if (rc < 0) {
1076                 goto failed;
1077         }
1078
1079         fde = tevent_add_fd(winbind_event_context(), priv_state,
1080                             priv_state->fd, TEVENT_FD_READ,
1081                             winbindd_listen_fde_handler, priv_state);
1082         if (fde == NULL) {
1083                 close(priv_state->fd);
1084                 goto failed;
1085         }
1086         tevent_fd_set_auto_close(fde);
1087
1088         return true;
1089 failed:
1090         TALLOC_FREE(pub_state);
1091         TALLOC_FREE(priv_state);
1092         return false;
1093 }
1094
1095 bool winbindd_use_idmap_cache(void)
1096 {
1097         return !opt_nocache;
1098 }
1099
1100 bool winbindd_use_cache(void)
1101 {
1102         return !opt_nocache;
1103 }
1104
1105 static void winbindd_register_handlers(struct messaging_context *msg_ctx,
1106                                        bool foreground)
1107 {
1108         /* Setup signal handlers */
1109
1110         if (!winbindd_setup_sig_term_handler(true))
1111                 exit(1);
1112         if (!winbindd_setup_stdin_handler(true, foreground))
1113                 exit(1);
1114         if (!winbindd_setup_sig_hup_handler(NULL))
1115                 exit(1);
1116         if (!winbindd_setup_sig_chld_handler())
1117                 exit(1);
1118         if (!winbindd_setup_sig_usr2_handler())
1119                 exit(1);
1120
1121         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1122
1123         /*
1124          * Ensure all cache and idmap caches are consistent
1125          * and initialized before we startup.
1126          */
1127         if (!winbindd_cache_validate_and_initialize()) {
1128                 exit(1);
1129         }
1130
1131         /* get broadcast messages */
1132
1133         if (!serverid_register(messaging_server_id(msg_ctx),
1134                                FLAG_MSG_GENERAL |
1135                                FLAG_MSG_WINBIND |
1136                                FLAG_MSG_DBWRAP)) {
1137                 DEBUG(1, ("Could not register myself in serverid.tdb\n"));
1138                 exit(1);
1139         }
1140
1141         /* React on 'smbcontrol winbindd reload-config' in the same way
1142            as to SIGHUP signal */
1143         messaging_register(msg_ctx, NULL,
1144                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1145         messaging_register(msg_ctx, NULL,
1146                            MSG_SHUTDOWN, msg_shutdown);
1147
1148         /* Handle online/offline messages. */
1149         messaging_register(msg_ctx, NULL,
1150                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1151         messaging_register(msg_ctx, NULL,
1152                            MSG_WINBIND_ONLINE, winbind_msg_online);
1153         messaging_register(msg_ctx, NULL,
1154                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1155
1156         messaging_register(msg_ctx, NULL,
1157                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1158
1159         messaging_register(msg_ctx, NULL,
1160                            MSG_WINBIND_VALIDATE_CACHE,
1161                            winbind_msg_validate_cache);
1162
1163         messaging_register(msg_ctx, NULL,
1164                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1165                            winbind_msg_dump_domain_list);
1166
1167         messaging_register(msg_ctx, NULL,
1168                            MSG_WINBIND_IP_DROPPED,
1169                            winbind_msg_ip_dropped_parent);
1170
1171         /* Register handler for MSG_DEBUG. */
1172         messaging_register(msg_ctx, NULL,
1173                            MSG_DEBUG,
1174                            winbind_msg_debug);
1175
1176         netsamlogon_cache_init(); /* Non-critical */
1177
1178         /* clear the cached list of trusted domains */
1179
1180         wcache_tdc_clear();
1181
1182         if (!init_domain_list()) {
1183                 DEBUG(0,("unable to initialize domain list\n"));
1184                 exit(1);
1185         }
1186
1187         init_idmap_child();
1188         init_locator_child();
1189
1190         smb_nscd_flush_user_cache();
1191         smb_nscd_flush_group_cache();
1192
1193         if (lp_allow_trusted_domains()) {
1194                 if (tevent_add_timer(winbind_event_context(), NULL, timeval_zero(),
1195                               rescan_trusted_domains, NULL) == NULL) {
1196                         DEBUG(0, ("Could not trigger rescan_trusted_domains()\n"));
1197                         exit(1);
1198                 }
1199         }
1200
1201 }
1202
1203 struct winbindd_addrchanged_state {
1204         struct addrchange_context *ctx;
1205         struct tevent_context *ev;
1206         struct messaging_context *msg_ctx;
1207 };
1208
1209 static void winbindd_addr_changed(struct tevent_req *req);
1210
1211 static void winbindd_init_addrchange(TALLOC_CTX *mem_ctx,
1212                                      struct tevent_context *ev,
1213                                      struct messaging_context *msg_ctx)
1214 {
1215         struct winbindd_addrchanged_state *state;
1216         struct tevent_req *req;
1217         NTSTATUS status;
1218
1219         state = talloc(mem_ctx, struct winbindd_addrchanged_state);
1220         if (state == NULL) {
1221                 DEBUG(10, ("talloc failed\n"));
1222                 return;
1223         }
1224         state->ev = ev;
1225         state->msg_ctx = msg_ctx;
1226
1227         status = addrchange_context_create(state, &state->ctx);
1228         if (!NT_STATUS_IS_OK(status)) {
1229                 DEBUG(10, ("addrchange_context_create failed: %s\n",
1230                            nt_errstr(status)));
1231                 TALLOC_FREE(state);
1232                 return;
1233         }
1234         req = addrchange_send(state, ev, state->ctx);
1235         if (req == NULL) {
1236                 DEBUG(0, ("addrchange_send failed\n"));
1237                 TALLOC_FREE(state);
1238                 return;
1239         }
1240         tevent_req_set_callback(req, winbindd_addr_changed, state);
1241 }
1242
1243 static void winbindd_addr_changed(struct tevent_req *req)
1244 {
1245         struct winbindd_addrchanged_state *state = tevent_req_callback_data(
1246                 req, struct winbindd_addrchanged_state);
1247         enum addrchange_type type;
1248         struct sockaddr_storage addr;
1249         NTSTATUS status;
1250
1251         status = addrchange_recv(req, &type, &addr);
1252         TALLOC_FREE(req);
1253         if (!NT_STATUS_IS_OK(status)) {
1254                 DEBUG(10, ("addrchange_recv failed: %s, stop listening\n",
1255                            nt_errstr(status)));
1256                 TALLOC_FREE(state);
1257                 return;
1258         }
1259         if (type == ADDRCHANGE_DEL) {
1260                 char addrstr[INET6_ADDRSTRLEN];
1261                 DATA_BLOB blob;
1262
1263                 print_sockaddr(addrstr, sizeof(addrstr), &addr);
1264
1265                 DEBUG(3, ("winbindd: kernel (AF_NETLINK) dropped ip %s\n",
1266                           addrstr));
1267
1268                 blob = data_blob_const(addrstr, strlen(addrstr)+1);
1269
1270                 status = messaging_send(state->msg_ctx,
1271                                         messaging_server_id(state->msg_ctx),
1272                                         MSG_WINBIND_IP_DROPPED, &blob);
1273                 if (!NT_STATUS_IS_OK(status)) {
1274                         DEBUG(10, ("messaging_send failed: %s - ignoring\n",
1275                                    nt_errstr(status)));
1276                 }
1277         }
1278         req = addrchange_send(state, state->ev, state->ctx);
1279         if (req == NULL) {
1280                 DEBUG(0, ("addrchange_send failed\n"));
1281                 TALLOC_FREE(state);
1282                 return;
1283         }
1284         tevent_req_set_callback(req, winbindd_addr_changed, state);
1285 }
1286
1287 /* Main function */
1288
1289 int main(int argc, char **argv, char **envp)
1290 {
1291         static bool is_daemon = False;
1292         static bool Fork = True;
1293         static bool log_stdout = False;
1294         static bool no_process_group = False;
1295         enum {
1296                 OPT_DAEMON = 1000,
1297                 OPT_FORK,
1298                 OPT_NO_PROCESS_GROUP,
1299                 OPT_LOG_STDOUT
1300         };
1301         struct poptOption long_options[] = {
1302                 POPT_AUTOHELP
1303                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1304                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1305                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1306                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1307                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1308                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1309                 POPT_COMMON_SAMBA
1310                 POPT_TABLEEND
1311         };
1312         poptContext pc;
1313         int opt;
1314         TALLOC_CTX *frame;
1315         NTSTATUS status;
1316         bool ok;
1317
1318         /*
1319          * Do this before any other talloc operation
1320          */
1321         talloc_enable_null_tracking();
1322         frame = talloc_stackframe();
1323
1324         setup_logging("winbindd", DEBUG_DEFAULT_STDOUT);
1325
1326         /* glibc (?) likes to print "User defined signal 1" and exit if a
1327            SIGUSR[12] is received before a handler is installed */
1328
1329         CatchSignal(SIGUSR1, SIG_IGN);
1330         CatchSignal(SIGUSR2, SIG_IGN);
1331
1332         fault_setup();
1333         dump_core_setup("winbindd", lp_logfile(talloc_tos()));
1334
1335         load_case_tables();
1336
1337         /* Initialise for running in non-root mode */
1338
1339         sec_init();
1340
1341         set_remote_machine_name("winbindd", False);
1342
1343         /* Set environment variable so we don't recursively call ourselves.
1344            This may also be useful interactively. */
1345
1346         if ( !winbind_off() ) {
1347                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1348                 exit(1);
1349         }
1350
1351         /* Initialise samba/rpc client stuff */
1352
1353         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1354
1355         while ((opt = poptGetNextOpt(pc)) != -1) {
1356                 switch (opt) {
1357                         /* Don't become a daemon */
1358                 case OPT_DAEMON:
1359                         is_daemon = True;
1360                         break;
1361                 case 'i':
1362                         interactive = True;
1363                         log_stdout = True;
1364                         Fork = False;
1365                         break;
1366                 case OPT_FORK:
1367                         Fork = false;
1368                         break;
1369                 case OPT_NO_PROCESS_GROUP:
1370                         no_process_group = true;
1371                         break;
1372                 case OPT_LOG_STDOUT:
1373                         log_stdout = true;
1374                         break;
1375                 case 'n':
1376                         opt_nocache = true;
1377                         break;
1378                 default:
1379                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1380                                   poptBadOption(pc, 0), poptStrerror(opt));
1381                         poptPrintUsage(pc, stderr, 0);
1382                         exit(1);
1383                 }
1384         }
1385
1386         /* We call dump_core_setup one more time because the command line can
1387          * set the log file or the log-basename and this will influence where
1388          * cores are stored. Without this call get_dyn_LOGFILEBASE will be
1389          * the default value derived from build's prefix. For EOM this value
1390          * is often not related to the path where winbindd is actually run
1391          * in production.
1392          */
1393         dump_core_setup("winbindd", lp_logfile(talloc_tos()));
1394         if (is_daemon && interactive) {
1395                 d_fprintf(stderr,"\nERROR: "
1396                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1397                 poptPrintUsage(pc, stderr, 0);
1398                 exit(1);
1399         }
1400
1401         if (log_stdout && Fork) {
1402                 d_fprintf(stderr, "\nERROR: "
1403                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1404                 poptPrintUsage(pc, stderr, 0);
1405                 exit(1);
1406         }
1407
1408         poptFreeContext(pc);
1409
1410         if (!override_logfile) {
1411                 char *lfile = NULL;
1412                 if (asprintf(&lfile,"%s/log.winbindd",
1413                                 get_dyn_LOGFILEBASE()) > 0) {
1414                         lp_set_logfile(lfile);
1415                         SAFE_FREE(lfile);
1416                 }
1417         }
1418
1419         if (log_stdout) {
1420                 setup_logging("winbindd", DEBUG_STDOUT);
1421         } else {
1422                 setup_logging("winbindd", DEBUG_FILE);
1423         }
1424         reopen_logs();
1425
1426         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1427         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1428
1429         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1430                 DEBUG(0, ("error opening config file '%s'\n", get_dyn_CONFIGFILE()));
1431                 exit(1);
1432         }
1433         /* After parsing the configuration file we setup the core path one more time
1434          * as the log file might have been set in the configuration and cores's
1435          * path is by default basename(lp_logfile()).
1436          */
1437         dump_core_setup("winbindd", lp_logfile(talloc_tos()));
1438
1439         if (lp_server_role() == ROLE_ACTIVE_DIRECTORY_DC) {
1440                 DEBUG(0, ("server role = 'active directory domain controller' not compatible with running the winbindd binary. \n"));
1441                 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"));
1442                 exit(1);
1443         }
1444
1445         /* Initialise messaging system */
1446
1447         if (winbind_messaging_context() == NULL) {
1448                 exit(1);
1449         }
1450
1451         if (!reload_services_file(NULL)) {
1452                 DEBUG(0, ("error opening config file\n"));
1453                 exit(1);
1454         }
1455
1456         ok = directory_create_or_exist(lp_lockdir(), geteuid(), 0755);
1457         if (!ok) {
1458                 DEBUG(0, ("Failed to create directory %s for lock files - %s\n",
1459                           lp_lockdir(), strerror(errno)));
1460                 exit(1);
1461         }
1462
1463         ok = directory_create_or_exist(lp_piddir(), geteuid(), 0755);
1464         if (!ok) {
1465                 DEBUG(0, ("Failed to create directory %s for pid files - %s\n",
1466                           lp_piddir(), strerror(errno)));
1467                 exit(1);
1468         }
1469
1470         /* Setup names. */
1471
1472         if (!init_names())
1473                 exit(1);
1474
1475         load_interfaces();
1476
1477         if (!secrets_init()) {
1478
1479                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1480                 return False;
1481         }
1482
1483         /* Unblock all signals we are interested in as they may have been
1484            blocked by the parent process. */
1485
1486         BlockSignals(False, SIGINT);
1487         BlockSignals(False, SIGQUIT);
1488         BlockSignals(False, SIGTERM);
1489         BlockSignals(False, SIGUSR1);
1490         BlockSignals(False, SIGUSR2);
1491         BlockSignals(False, SIGHUP);
1492         BlockSignals(False, SIGCHLD);
1493
1494         if (!interactive)
1495                 become_daemon(Fork, no_process_group, log_stdout);
1496
1497         pidfile_create(lp_piddir(), "winbindd");
1498
1499 #if HAVE_SETPGID
1500         /*
1501          * If we're interactive we want to set our own process group for
1502          * signal management.
1503          */
1504         if (interactive && !no_process_group)
1505                 setpgid( (pid_t)0, (pid_t)0);
1506 #endif
1507
1508         TimeInit();
1509
1510         /* Don't use winbindd_reinit_after_fork here as
1511          * we're just starting up and haven't created any
1512          * winbindd-specific resources we must free yet. JRA.
1513          */
1514
1515         status = reinit_after_fork(winbind_messaging_context(),
1516                                    winbind_event_context(),
1517                                    false);
1518         if (!NT_STATUS_IS_OK(status)) {
1519                 DEBUG(0,("reinit_after_fork() failed\n"));
1520                 exit(1);
1521         }
1522
1523         /*
1524          * Do not initialize the parent-child-pipe before becoming
1525          * a daemon: this is used to detect a died parent in the child
1526          * process.
1527          */
1528         status = init_before_fork();
1529         if (!NT_STATUS_IS_OK(status)) {
1530                 DEBUG(0, ("init_before_fork failed: %s\n", nt_errstr(status)));
1531                 exit(1);
1532         }
1533
1534         winbindd_register_handlers(winbind_messaging_context(), !Fork);
1535
1536         status = init_system_session_info();
1537         if (!NT_STATUS_IS_OK(status)) {
1538                 DEBUG(1, ("ERROR: failed to setup system user info: %s.\n",
1539                           nt_errstr(status)));
1540                 exit(1);
1541         }
1542
1543         rpc_lsarpc_init(NULL);
1544         rpc_samr_init(NULL);
1545
1546         winbindd_init_addrchange(NULL, winbind_event_context(),
1547                                  winbind_messaging_context());
1548
1549         /* setup listen sockets */
1550
1551         if (!winbindd_setup_listeners()) {
1552                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1553                 exit(1);
1554         }
1555
1556         TALLOC_FREE(frame);
1557         /* Loop waiting for requests */
1558         while (1) {
1559                 frame = talloc_stackframe();
1560
1561                 if (tevent_loop_once(winbind_event_context()) == -1) {
1562                         DEBUG(1, ("tevent_loop_once() failed: %s\n",
1563                                   strerror(errno)));
1564                         return 1;
1565                 }
1566
1567                 TALLOC_FREE(frame);
1568         }
1569
1570         return 0;
1571 }