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