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 "winbindd.h"
  27 #include "../../nsswitch/libwbclient/wbc_async.h"
  28
  29 #undef DBGC_CLASS
  30 #define DBGC_CLASS DBGC_WINBIND
  31
  32 static void remove_client(struct winbindd_cli_state *state);
  33
  34 static bool opt_nocache = False;
  35 static bool interactive = False;
  36
  37 extern bool override_logfile;
  38
  39 struct event_context *winbind_event_context(void)
  40 {
  41         static struct event_context *ctx;
  42
  43         if (!ctx && !(ctx = event_context_init(NULL))) {
  44                 smb_panic("Could not init winbind event context");
  45         }
  46         return ctx;
  47 }
  48
  49 struct messaging_context *winbind_messaging_context(void)
  50 {
  51         static struct messaging_context *ctx;
  52
  53         if (ctx == NULL) {
  54                 ctx = messaging_init(NULL, procid_self(),
  55                                      winbind_event_context());
  56         }
  57         if (ctx == NULL) {
  58                 DEBUG(0, ("Could not init winbind messaging context.\n"));
  59         }
  60         return ctx;
  61 }
  62
  63 /* Reload configuration */
  64
  65 static bool reload_services_file(const char *lfile)
  66 {
  67         bool ret;
  68
  69         if (lp_loaded()) {
  70                 const char *fname = lp_configfile();
  71
  72                 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
  73                         set_dyn_CONFIGFILE(fname);
  74                 }
  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(get_dyn_CONFIGFILE(),False,False,True,True);
  85
  86         reopen_logs();
  87         load_interfaces();
  88
  89         return(ret);
  90 }
  91
  92
  93 /**************************************************************************** **
  94  Handle a fault..
  95  **************************************************************************** */
  96
  97 static void fault_quit(void)
  98 {
  99         dump_core();
 100 }
 101
 102 static void winbindd_status(void)
 103 {
 104         struct winbindd_cli_state *tmp;
 105
 106         DEBUG(0, ("winbindd status:\n"));
 107
 108         /* Print client state information */
 109
 110         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
 111
 112         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
 113                 DEBUG(2, ("\tclient list:\n"));
 114                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
 115                         DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
 116                                   (unsigned long)tmp->pid, tmp->sock));
 117                 }
 118         }
 119 }
 120
 121 /* Print winbindd status to log file */
 122
 123 static void print_winbindd_status(void)
 124 {
 125         winbindd_status();
 126 }
 127
 128 /* Flush client cache */
 129
 130 static void flush_caches(void)
 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
 136         if (!wcache_invalidate_cache()) {
 137                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 138                 if (!winbindd_cache_validate_and_initialize()) {
 139                         exit(1);
 140                 }
 141         }
 142 }
 143
 144 static void flush_caches_noinit(void)
 145 {
 146         /*
 147          * We need to invalidate cached user list entries on a SIGHUP
 148          * otherwise cached access denied errors due to restrict anonymous
 149          * hang around until the sequence number changes.
 150          * NB
 151          * Skip uninitialized domains when flush cache.
 152          * If domain is not initialized, it means it is never
 153          * used or never become online. look, wcache_invalidate_cache()
 154          * -> get_cache() -> init_dc_connection(). It causes a lot of traffic
 155          * for unused domains and large traffic for primay domain's DC if there
 156          * are many domains..
 157          */
 158
 159         if (!wcache_invalidate_cache_noinit()) {
 160                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 161                 if (!winbindd_cache_validate_and_initialize()) {
 162                         exit(1);
 163                 }
 164         }
 165 }
 166
 167 /* Handle the signal by unlinking socket and exiting */
 168
 169 static void terminate(bool is_parent)
 170 {
 171         if (is_parent) {
 172                 /* When parent goes away we should
 173                  * remove the socket file. Not so
 174                  * when children terminate.
 175                  */
 176                 char *path = NULL;
 177
 178                 if (asprintf(&path, "%s/%s",
 179                         get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
 180                         unlink(path);
 181                         SAFE_FREE(path);
 182                 }
 183         }
 184
 185         idmap_close();
 186
 187         trustdom_cache_shutdown();
 188
 189         gencache_stabilize();
 190
 191 #if 0
 192         if (interactive) {
 193                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 194                 char *description = talloc_describe_all(mem_ctx);
 195
 196                 DEBUG(3, ("tallocs left:\n%s\n", description));
 197                 talloc_destroy(mem_ctx);
 198         }
 199 #endif
 200
 201         if (is_parent) {
 202                 pidfile_unlink();
 203         }
 204
 205         exit(0);
 206 }
 207
 208 static void winbindd_sig_term_handler(struct tevent_context *ev,
 209                                       struct tevent_signal *se,
 210                                       int signum,
 211                                       int count,
 212                                       void *siginfo,
 213                                       void *private_data)
 214 {
 215         bool *is_parent = talloc_get_type_abort(private_data, bool);
 216
 217         DEBUG(0,("Got sig[%d] terminate (is_parent=%d)\n",
 218                  signum, (int)*is_parent));
 219         terminate(*is_parent);
 220 }
 221
 222 bool winbindd_setup_sig_term_handler(bool parent)
 223 {
 224         struct tevent_signal *se;
 225         bool *is_parent;
 226
 227         is_parent = talloc(winbind_event_context(), bool);
 228         if (!is_parent) {
 229                 return false;
 230         }
 231
 232         *is_parent = parent;
 233
 234         se = tevent_add_signal(winbind_event_context(),
 235                                is_parent,
 236                                SIGTERM, 0,
 237                                winbindd_sig_term_handler,
 238                                is_parent);
 239         if (!se) {
 240                 DEBUG(0,("failed to setup SIGTERM handler"));
 241                 talloc_free(is_parent);
 242                 return false;
 243         }
 244
 245         se = tevent_add_signal(winbind_event_context(),
 246                                is_parent,
 247                                SIGINT, 0,
 248                                winbindd_sig_term_handler,
 249                                is_parent);
 250         if (!se) {
 251                 DEBUG(0,("failed to setup SIGINT handler"));
 252                 talloc_free(is_parent);
 253                 return false;
 254         }
 255
 256         se = tevent_add_signal(winbind_event_context(),
 257                                is_parent,
 258                                SIGQUIT, 0,
 259                                winbindd_sig_term_handler,
 260                                is_parent);
 261         if (!se) {
 262                 DEBUG(0,("failed to setup SIGINT handler"));
 263                 talloc_free(is_parent);
 264                 return false;
 265         }
 266
 267         return true;
 268 }
 269
 270 static void winbindd_sig_hup_handler(struct tevent_context *ev,
 271                                      struct tevent_signal *se,
 272                                      int signum,
 273                                      int count,
 274                                      void *siginfo,
 275                                      void *private_data)
 276 {
 277         const char *file = (const char *)private_data;
 278
 279         DEBUG(1,("Reloading services after SIGHUP\n"));
 280         flush_caches_noinit();
 281         reload_services_file(file);
 282 }
 283
 284 bool winbindd_setup_sig_hup_handler(const char *lfile)
 285 {
 286         struct tevent_signal *se;
 287         char *file = NULL;
 288
 289         if (lfile) {
 290                 file = talloc_strdup(winbind_event_context(),
 291                                      lfile);
 292                 if (!file) {
 293                         return false;
 294                 }
 295         }
 296
 297         se = tevent_add_signal(winbind_event_context(),
 298                                winbind_event_context(),
 299                                SIGHUP, 0,
 300                                winbindd_sig_hup_handler,
 301                                file);
 302         if (!se) {
 303                 return false;
 304         }
 305
 306         return true;
 307 }
 308
 309 static void winbindd_sig_chld_handler(struct tevent_context *ev,
 310                                       struct tevent_signal *se,
 311                                       int signum,
 312                                       int count,
 313                                       void *siginfo,
 314                                       void *private_data)
 315 {
 316         pid_t pid;
 317
 318         while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 319                 winbind_child_died(pid);
 320         }
 321 }
 322
 323 static bool winbindd_setup_sig_chld_handler(void)
 324 {
 325         struct tevent_signal *se;
 326
 327         se = tevent_add_signal(winbind_event_context(),
 328                                winbind_event_context(),
 329                                SIGCHLD, 0,
 330                                winbindd_sig_chld_handler,
 331                                NULL);
 332         if (!se) {
 333                 return false;
 334         }
 335
 336         return true;
 337 }
 338
 339 static void winbindd_sig_usr2_handler(struct tevent_context *ev,
 340                                       struct tevent_signal *se,
 341                                       int signum,
 342                                       int count,
 343                                       void *siginfo,
 344                                       void *private_data)
 345 {
 346         print_winbindd_status();
 347 }
 348
 349 static bool winbindd_setup_sig_usr2_handler(void)
 350 {
 351         struct tevent_signal *se;
 352
 353         se = tevent_add_signal(winbind_event_context(),
 354                                winbind_event_context(),
 355                                SIGUSR2, 0,
 356                                winbindd_sig_usr2_handler,
 357                                NULL);
 358         if (!se) {
 359                 return false;
 360         }
 361
 362         return true;
 363 }
 364
 365 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 366 static void msg_reload_services(struct messaging_context *msg,
 367                                 void *private_data,
 368                                 uint32_t msg_type,
 369                                 struct server_id server_id,
 370                                 DATA_BLOB *data)
 371 {
 372         /* Flush various caches */
 373         flush_caches();
 374         reload_services_file((const char *) private_data);
 375 }
 376
 377 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 378 static void msg_shutdown(struct messaging_context *msg,
 379                          void *private_data,
 380                          uint32_t msg_type,
 381                          struct server_id server_id,
 382                          DATA_BLOB *data)
 383 {
 384         /* only the parent waits for this message */
 385         DEBUG(0,("Got shutdown message\n"));
 386         terminate(true);
 387 }
 388
 389
 390 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
 391                                        void *private_data,
 392                                        uint32_t msg_type,
 393                                        struct server_id server_id,
 394                                        DATA_BLOB *data)
 395 {
 396         uint8 ret;
 397         pid_t child_pid;
 398         struct sigaction act;
 399         struct sigaction oldact;
 400
 401         DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
 402                    "message.\n"));
 403
 404         /*
 405          * call the validation code from a child:
 406          * so we don't block the main winbindd and the validation
 407          * code can safely use fork/waitpid...
 408          */
 409         CatchChild();
 410         child_pid = sys_fork();
 411
 412         if (child_pid == -1) {
 413                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
 414                           strerror(errno)));
 415                 return;
 416         }
 417
 418         if (child_pid != 0) {
 419                 /* parent */
 420                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
 421                           "pid %d.\n", (int)child_pid));
 422                 return;
 423         }
 424
 425         /* child */
 426
 427         /* install default SIGCHLD handler: validation code uses fork/waitpid */
 428         ZERO_STRUCT(act);
 429         act.sa_handler = SIG_DFL;
 430 #ifdef SA_RESTART
 431         /* We *want* SIGALRM to interrupt a system call. */
 432         act.sa_flags = SA_RESTART;
 433 #endif
 434         sigemptyset(&act.sa_mask);
 435         sigaddset(&act.sa_mask,SIGCHLD);
 436         sigaction(SIGCHLD,&act,&oldact);
 437
 438         ret = (uint8)winbindd_validate_cache_nobackup();
 439         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
 440         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
 441                            (size_t)1);
 442         _exit(0);
 443 }
 444
 445 static struct winbindd_dispatch_table {
 446         enum winbindd_cmd cmd;
 447         void (*fn)(struct winbindd_cli_state *state);
 448         const char *winbindd_cmd_name;
 449 } dispatch_table[] = {
 450
 451         /* PAM auth functions */
 452
 453         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 454         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 455         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 456         { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
 457         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
 458
 459         /* Enumeration functions */
 460
 461         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 462           "LIST_TRUSTDOM" },
 463
 464         /* Miscellaneous */
 465
 466         { WINBINDD_INFO, winbindd_info, "INFO" },
 467         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 468           "INTERFACE_VERSION" },
 469         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 470         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 471         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 472         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 473           "WINBINDD_PRIV_PIPE_DIR" },
 474
 475         /* Credential cache access */
 476         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 477         { WINBINDD_CCACHE_SAVE, winbindd_ccache_save, "CCACHE_SAVE" },
 478
 479         /* WINS functions */
 480
 481         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 482         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 483
 484         /* End of list */
 485
 486         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 487 };
 488
 489 struct winbindd_async_dispatch_table {
 490         enum winbindd_cmd cmd;
 491         const char *cmd_name;
 492         struct tevent_req *(*send_req)(TALLOC_CTX *mem_ctx,
 493                                        struct tevent_context *ev,
 494                                        struct winbindd_cli_state *cli,
 495                                        struct winbindd_request *request);
 496         NTSTATUS (*recv_req)(struct tevent_req *req,
 497                              struct winbindd_response *presp);
 498 };
 499
 500 static struct winbindd_async_dispatch_table async_nonpriv_table[] = {
 501         { WINBINDD_PING, "PING",
 502           wb_ping_send, wb_ping_recv },
 503         { WINBINDD_LOOKUPSID, "LOOKUPSID",
 504           winbindd_lookupsid_send, winbindd_lookupsid_recv },
 505         { WINBINDD_LOOKUPNAME, "LOOKUPNAME",
 506           winbindd_lookupname_send, winbindd_lookupname_recv },
 507         { WINBINDD_SID_TO_UID, "SID_TO_UID",
 508           winbindd_sid_to_uid_send, winbindd_sid_to_uid_recv },
 509         { WINBINDD_SID_TO_GID, "SID_TO_GID",
 510           winbindd_sid_to_gid_send, winbindd_sid_to_gid_recv },
 511         { WINBINDD_UID_TO_SID, "UID_TO_SID",
 512           winbindd_uid_to_sid_send, winbindd_uid_to_sid_recv },
 513         { WINBINDD_GID_TO_SID, "GID_TO_SID",
 514           winbindd_gid_to_sid_send, winbindd_gid_to_sid_recv },
 515         { WINBINDD_GETPWSID, "GETPWSID",
 516           winbindd_getpwsid_send, winbindd_getpwsid_recv },
 517         { WINBINDD_GETPWNAM, "GETPWNAM",
 518           winbindd_getpwnam_send, winbindd_getpwnam_recv },
 519         { WINBINDD_GETPWUID, "GETPWUID",
 520           winbindd_getpwuid_send, winbindd_getpwuid_recv },
 521         { WINBINDD_GETSIDALIASES, "GETSIDALIASES",
 522           winbindd_getsidaliases_send, winbindd_getsidaliases_recv },
 523         { WINBINDD_GETUSERDOMGROUPS, "GETUSERDOMGROUPS",
 524           winbindd_getuserdomgroups_send, winbindd_getuserdomgroups_recv },
 525         { WINBINDD_GETGROUPS, "GETGROUPS",
 526           winbindd_getgroups_send, winbindd_getgroups_recv },
 527         { WINBINDD_SHOW_SEQUENCE, "SHOW_SEQUENCE",
 528           winbindd_show_sequence_send, winbindd_show_sequence_recv },
 529         { WINBINDD_GETGRGID, "GETGRGID",
 530           winbindd_getgrgid_send, winbindd_getgrgid_recv },
 531         { WINBINDD_GETGRNAM, "GETGRNAM",
 532           winbindd_getgrnam_send, winbindd_getgrnam_recv },
 533         { WINBINDD_GETUSERSIDS, "GETUSERSIDS",
 534           winbindd_getusersids_send, winbindd_getusersids_recv },
 535         { WINBINDD_LOOKUPRIDS, "LOOKUPRIDS",
 536           winbindd_lookuprids_send, winbindd_lookuprids_recv },
 537         { WINBINDD_SETPWENT, "SETPWENT",
 538           winbindd_setpwent_send, winbindd_setpwent_recv },
 539         { WINBINDD_GETPWENT, "GETPWENT",
 540           winbindd_getpwent_send, winbindd_getpwent_recv },
 541         { WINBINDD_ENDPWENT, "ENDPWENT",
 542           winbindd_endpwent_send, winbindd_endpwent_recv },
 543         { WINBINDD_DSGETDCNAME, "DSGETDCNAME",
 544           winbindd_dsgetdcname_send, winbindd_dsgetdcname_recv },
 545         { WINBINDD_GETDCNAME, "GETDCNAME",
 546           winbindd_getdcname_send, winbindd_getdcname_recv },
 547         { WINBINDD_SETGRENT, "SETGRENT",
 548           winbindd_setgrent_send, winbindd_setgrent_recv },
 549         { WINBINDD_GETGRENT, "GETGRENT",
 550           winbindd_getgrent_send, winbindd_getgrent_recv },
 551         { WINBINDD_ENDGRENT, "ENDGRENT",
 552           winbindd_endgrent_send, winbindd_endgrent_recv },
 553         { WINBINDD_LIST_USERS, "LIST_USERS",
 554           winbindd_list_users_send, winbindd_list_users_recv },
 555         { WINBINDD_LIST_GROUPS, "LIST_GROUPS",
 556           winbindd_list_groups_send, winbindd_list_groups_recv },
 557         { WINBINDD_CHECK_MACHACC, "CHECK_MACHACC",
 558           winbindd_check_machine_acct_send, winbindd_check_machine_acct_recv },
 559         { WINBINDD_PING_DC, "PING_DC",
 560           winbindd_ping_dc_send, winbindd_ping_dc_recv },
 561
 562         { 0, NULL, NULL, NULL }
 563 };
 564
 565 static struct winbindd_async_dispatch_table async_priv_table[] = {
 566         { WINBINDD_ALLOCATE_UID, "ALLOCATE_UID",
 567           winbindd_allocate_uid_send, winbindd_allocate_uid_recv },
 568         { WINBINDD_ALLOCATE_GID, "ALLOCATE_GID",
 569           winbindd_allocate_gid_send, winbindd_allocate_gid_recv },
 570         { WINBINDD_SET_MAPPING, "SET_MAPPING",
 571           winbindd_set_mapping_send, winbindd_set_mapping_recv },
 572         { WINBINDD_REMOVE_MAPPING, "SET_MAPPING",
 573           winbindd_remove_mapping_send, winbindd_remove_mapping_recv },
 574         { WINBINDD_SET_HWM, "SET_HWM",
 575           winbindd_set_hwm_send, winbindd_set_hwm_recv },
 576         { WINBINDD_CHANGE_MACHACC, "CHANGE_MACHACC",
 577           winbindd_change_machine_acct_send, winbindd_change_machine_acct_recv },
 578
 579         { 0, NULL, NULL, NULL }
 580 };
 581
 582 static void wb_request_done(struct tevent_req *req);
 583
 584 static void process_request(struct winbindd_cli_state *state)
 585 {
 586         struct winbindd_dispatch_table *table = dispatch_table;
 587         struct winbindd_async_dispatch_table *atable;
 588
 589         state->mem_ctx = talloc_init("winbind request");
 590         if (state->mem_ctx == NULL)
 591                 return;
 592
 593         /* Remember who asked us. */
 594         state->pid = state->request->pid;
 595
 596         /* Process command */
 597
 598         for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
 599                 if (state->request->cmd == atable->cmd) {
 600                         break;
 601                 }
 602         }
 603
 604         if ((atable->send_req == NULL) && state->privileged) {
 605                 for (atable = async_priv_table; atable->send_req;
 606                      atable += 1) {
 607                         if (state->request->cmd == atable->cmd) {
 608                                 break;
 609                         }
 610                 }
 611         }
 612
 613         if (atable->send_req != NULL) {
 614                 struct tevent_req *req;
 615
 616                 DEBUG(10, ("process_request: Handling async request %s\n",
 617                            atable->cmd_name));
 618
 619                 req = atable->send_req(state->mem_ctx, winbind_event_context(),
 620                                        state, state->request);
 621                 if (req == NULL) {
 622                         DEBUG(0, ("process_request: atable->send failed for "
 623                                   "%s\n", atable->cmd_name));
 624                         request_error(state);
 625                         return;
 626                 }
 627                 tevent_req_set_callback(req, wb_request_done, state);
 628                 state->recv_fn = atable->recv_req;
 629                 return;
 630         }
 631
 632         state->response = talloc_zero(state->mem_ctx,
 633                                       struct winbindd_response);
 634         if (state->response == NULL) {
 635                 DEBUG(10, ("talloc failed\n"));
 636                 remove_client(state);
 637                 return;
 638         }
 639         state->response->result = WINBINDD_PENDING;
 640         state->response->length = sizeof(struct winbindd_response);
 641
 642         for (table = dispatch_table; table->fn; table++) {
 643                 if (state->request->cmd == table->cmd) {
 644                         DEBUG(10,("process_request: request fn %s\n",
 645                                   table->winbindd_cmd_name ));
 646                         table->fn(state);
 647                         break;
 648                 }
 649         }
 650
 651         if (!table->fn) {
 652                 DEBUG(10,("process_request: unknown request fn number %d\n",
 653                           (int)state->request->cmd ));
 654                 request_error(state);
 655         }
 656 }
 657
 658 static void wb_request_done(struct tevent_req *req)
 659 {
 660         struct winbindd_cli_state *state = tevent_req_callback_data(
 661                 req, struct winbindd_cli_state);
 662         NTSTATUS status;
 663
 664         state->response = talloc_zero(state, struct winbindd_response);
 665         if (state->response == NULL) {
 666                 remove_client(state);
 667                 return;
 668         }
 669         state->response->result = WINBINDD_PENDING;
 670         state->response->length = sizeof(struct winbindd_response);
 671
 672         status = state->recv_fn(req, state->response);
 673         TALLOC_FREE(req);
 674         if (!NT_STATUS_IS_OK(status)) {
 675                 DEBUG(10, ("returning %s\n", nt_errstr(status)));
 676                 request_error(state);
 677                 return;
 678         }
 679         request_ok(state);
 680 }
 681
 682 /*
 683  * This is the main event loop of winbind requests. It goes through a
 684  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 685  *
 686  * An idle winbind client has a read request of 4 bytes outstanding,
 687  * finalizing function is request_len_recv, checking the length. request_recv
 688  * then processes the packet. The processing function then at some point has
 689  * to call request_finished which schedules sending the response.
 690  */
 691
 692 static void request_finished(struct winbindd_cli_state *state);
 693
 694 static void winbind_client_request_read(struct tevent_req *req);
 695 static void winbind_client_response_written(struct tevent_req *req);
 696
 697 static void request_finished(struct winbindd_cli_state *state)
 698 {
 699         struct tevent_req *req;
 700
 701         TALLOC_FREE(state->request);
 702
 703         req = wb_resp_write_send(state, winbind_event_context(),
 704                                  state->out_queue, state->sock,
 705                                  state->response);
 706         if (req == NULL) {
 707                 remove_client(state);
 708                 return;
 709         }
 710         tevent_req_set_callback(req, winbind_client_response_written, state);
 711 }
 712
 713 static void winbind_client_response_written(struct tevent_req *req)
 714 {
 715         struct winbindd_cli_state *state = tevent_req_callback_data(
 716                 req, struct winbindd_cli_state);
 717         ssize_t ret;
 718         int err;
 719
 720         ret = wb_resp_write_recv(req, &err);
 721         TALLOC_FREE(req);
 722         if (ret == -1) {
 723                 close(state->sock);
 724                 state->sock = -1;
 725                 DEBUG(2, ("Could not write response to client: %s\n",
 726                           strerror(err)));
 727                 remove_client(state);
 728                 return;
 729         }
 730
 731         TALLOC_FREE(state->mem_ctx);
 732         state->response = NULL;
 733
 734         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 735                                WINBINDD_MAX_EXTRA_DATA);
 736         if (req == NULL) {
 737                 remove_client(state);
 738                 return;
 739         }
 740         tevent_req_set_callback(req, winbind_client_request_read, state);
 741 }
 742
 743 void request_error(struct winbindd_cli_state *state)
 744 {
 745         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 746         state->response->result = WINBINDD_ERROR;
 747         request_finished(state);
 748 }
 749
 750 void request_ok(struct winbindd_cli_state *state)
 751 {
 752         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 753         state->response->result = WINBINDD_OK;
 754         request_finished(state);
 755 }
 756
 757 /* Process a new connection by adding it to the client connection list */
 758
 759 static void new_connection(int listen_sock, bool privileged)
 760 {
 761         struct sockaddr_un sunaddr;
 762         struct winbindd_cli_state *state;
 763         struct tevent_req *req;
 764         socklen_t len;
 765         int sock;
 766
 767         /* Accept connection */
 768
 769         len = sizeof(sunaddr);
 770
 771         do {
 772                 sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr,
 773                               &len);
 774         } while (sock == -1 && errno == EINTR);
 775
 776         if (sock == -1)
 777                 return;
 778
 779         DEBUG(6,("accepted socket %d\n", sock));
 780
 781         /* Create new connection structure */
 782
 783         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 784                 close(sock);
 785                 return;
 786         }
 787
 788         state->sock = sock;
 789
 790         state->out_queue = tevent_queue_create(state, "winbind client reply");
 791         if (state->out_queue == NULL) {
 792                 close(sock);
 793                 TALLOC_FREE(state);
 794                 return;
 795         }
 796
 797         state->last_access = time(NULL);
 798
 799         state->privileged = privileged;
 800
 801         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 802                                WINBINDD_MAX_EXTRA_DATA);
 803         if (req == NULL) {
 804                 TALLOC_FREE(state);
 805                 close(sock);
 806                 return;
 807         }
 808         tevent_req_set_callback(req, winbind_client_request_read, state);
 809
 810         /* Add to connection list */
 811
 812         winbindd_add_client(state);
 813 }
 814
 815 static void winbind_client_request_read(struct tevent_req *req)
 816 {
 817         struct winbindd_cli_state *state = tevent_req_callback_data(
 818                 req, struct winbindd_cli_state);
 819         ssize_t ret;
 820         int err;
 821
 822         ret = wb_req_read_recv(req, state, &state->request, &err);
 823         TALLOC_FREE(req);
 824         if (ret == -1) {
 825                 if (err == EPIPE) {
 826                         DEBUG(6, ("closing socket %d, client exited\n",
 827                                   state->sock));
 828                 } else {
 829                         DEBUG(2, ("Could not read client request from fd %d: "
 830                                   "%s\n", state->sock, strerror(err)));
 831                 }
 832                 close(state->sock);
 833                 state->sock = -1;
 834                 remove_client(state);
 835                 return;
 836         }
 837         process_request(state);
 838 }
 839
 840 /* Remove a client connection from client connection list */
 841
 842 static void remove_client(struct winbindd_cli_state *state)
 843 {
 844         char c = 0;
 845         int nwritten;
 846
 847         /* It's a dead client - hold a funeral */
 848
 849         if (state == NULL) {
 850                 return;
 851         }
 852
 853         if (state->sock != -1) {
 854                 /* tell client, we are closing ... */
 855                 nwritten = write(state->sock, &c, sizeof(c));
 856                 if (nwritten == -1) {
 857                         DEBUG(2, ("final write to client failed: %s\n",
 858                                 strerror(errno)));
 859                 }
 860
 861                 /* Close socket */
 862
 863                 close(state->sock);
 864                 state->sock = -1;
 865         }
 866
 867         TALLOC_FREE(state->mem_ctx);
 868
 869         /* Remove from list and free */
 870
 871         winbindd_remove_client(state);
 872         TALLOC_FREE(state);
 873 }
 874
 875 /* Shutdown client connection which has been idle for the longest time */
 876
 877 static bool remove_idle_client(void)
 878 {
 879         struct winbindd_cli_state *state, *remove_state = NULL;
 880         time_t last_access = 0;
 881         int nidle = 0;
 882
 883         for (state = winbindd_client_list(); state; state = state->next) {
 884                 if (state->response == NULL &&
 885                     !state->pwent_state && !state->grent_state) {
 886                         nidle++;
 887                         if (!last_access || state->last_access < last_access) {
 888                                 last_access = state->last_access;
 889                                 remove_state = state;
 890                         }
 891                 }
 892         }
 893
 894         if (remove_state) {
 895                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 896                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 897                 remove_client(remove_state);
 898                 return True;
 899         }
 900
 901         return False;
 902 }
 903
 904 struct winbindd_listen_state {
 905         bool privileged;
 906         int fd;
 907 };
 908
 909 static void winbindd_listen_fde_handler(struct tevent_context *ev,
 910                                         struct tevent_fd *fde,
 911                                         uint16_t flags,
 912                                         void *private_data)
 913 {
 914         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
 915                                           struct winbindd_listen_state);
 916
 917         while (winbindd_num_clients() >
 918                WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 919                 DEBUG(5,("winbindd: Exceeding %d client "
 920                          "connections, removing idle "
 921                          "connection.\n",
 922                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 923                 if (!remove_idle_client()) {
 924                         DEBUG(0,("winbindd: Exceeding %d "
 925                                  "client connections, no idle "
 926                                  "connection found\n",
 927                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 928                         break;
 929                 }
 930         }
 931         new_connection(s->fd, s->privileged);
 932 }
 933
 934 static bool winbindd_setup_listeners(void)
 935 {
 936         struct winbindd_listen_state *pub_state = NULL;
 937         struct winbindd_listen_state *priv_state = NULL;
 938         struct tevent_fd *fde;
 939
 940         pub_state = talloc(winbind_event_context(),
 941                            struct winbindd_listen_state);
 942         if (!pub_state) {
 943                 goto failed;
 944         }
 945
 946         pub_state->privileged = false;
 947         pub_state->fd = open_winbindd_socket();
 948         if (pub_state->fd == -1) {
 949                 goto failed;
 950         }
 951
 952         fde = tevent_add_fd(winbind_event_context(), pub_state, pub_state->fd,
 953                             TEVENT_FD_READ, winbindd_listen_fde_handler,
 954                             pub_state);
 955         if (fde == NULL) {
 956                 close(pub_state->fd);
 957                 goto failed;
 958         }
 959         tevent_fd_set_auto_close(fde);
 960
 961         priv_state = talloc(winbind_event_context(),
 962                             struct winbindd_listen_state);
 963         if (!priv_state) {
 964                 goto failed;
 965         }
 966
 967         priv_state->privileged = true;
 968         priv_state->fd = open_winbindd_priv_socket();
 969         if (priv_state->fd == -1) {
 970                 goto failed;
 971         }
 972
 973         fde = tevent_add_fd(winbind_event_context(), priv_state,
 974                             priv_state->fd, TEVENT_FD_READ,
 975                             winbindd_listen_fde_handler, priv_state);
 976         if (fde == NULL) {
 977                 close(priv_state->fd);
 978                 goto failed;
 979         }
 980         tevent_fd_set_auto_close(fde);
 981
 982         return true;
 983 failed:
 984         TALLOC_FREE(pub_state);
 985         TALLOC_FREE(priv_state);
 986         return false;
 987 }
 988
 989 bool winbindd_use_idmap_cache(void)
 990 {
 991         return !opt_nocache;
 992 }
 993
 994 bool winbindd_use_cache(void)
 995 {
 996         return !opt_nocache;
 997 }
 998
 999 /* Main function */
1000
1001 int main(int argc, char **argv, char **envp)
1002 {
1003         static bool is_daemon = False;
1004         static bool Fork = True;
1005         static bool log_stdout = False;
1006         static bool no_process_group = False;
1007         enum {
1008                 OPT_DAEMON = 1000,
1009                 OPT_FORK,
1010                 OPT_NO_PROCESS_GROUP,
1011                 OPT_LOG_STDOUT
1012         };
1013         struct poptOption long_options[] = {
1014                 POPT_AUTOHELP
1015                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1016                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1017                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1018                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1019                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1020                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1021                 POPT_COMMON_SAMBA
1022                 POPT_TABLEEND
1023         };
1024         poptContext pc;
1025         int opt;
1026         TALLOC_CTX *frame = talloc_stackframe();
1027         struct tevent_timer *te;
1028
1029         /* glibc (?) likes to print "User defined signal 1" and exit if a
1030            SIGUSR[12] is received before a handler is installed */
1031
1032         CatchSignal(SIGUSR1, SIG_IGN);
1033         CatchSignal(SIGUSR2, SIG_IGN);
1034
1035         fault_setup((void (*)(void *))fault_quit );
1036         dump_core_setup("winbindd");
1037
1038         load_case_tables();
1039
1040         /* Initialise for running in non-root mode */
1041
1042         sec_init();
1043
1044         set_remote_machine_name("winbindd", False);
1045
1046         /* Set environment variable so we don't recursively call ourselves.
1047            This may also be useful interactively. */
1048
1049         if ( !winbind_off() ) {
1050                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1051                 exit(1);
1052         }
1053
1054         /* Initialise samba/rpc client stuff */
1055
1056         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1057
1058         while ((opt = poptGetNextOpt(pc)) != -1) {
1059                 switch (opt) {
1060                         /* Don't become a daemon */
1061                 case OPT_DAEMON:
1062                         is_daemon = True;
1063                         break;
1064                 case 'i':
1065                         interactive = True;
1066                         log_stdout = True;
1067                         Fork = False;
1068                         break;
1069                 case OPT_FORK:
1070                         Fork = false;
1071                         break;
1072                 case OPT_NO_PROCESS_GROUP:
1073                         no_process_group = true;
1074                         break;
1075                 case OPT_LOG_STDOUT:
1076                         log_stdout = true;
1077                         break;
1078                 case 'n':
1079                         opt_nocache = true;
1080                         break;
1081                 default:
1082                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1083                                   poptBadOption(pc, 0), poptStrerror(opt));
1084                         poptPrintUsage(pc, stderr, 0);
1085                         exit(1);
1086                 }
1087         }
1088
1089         if (is_daemon && interactive) {
1090                 d_fprintf(stderr,"\nERROR: "
1091                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1092                 poptPrintUsage(pc, stderr, 0);
1093                 exit(1);
1094         }
1095
1096         if (log_stdout && Fork) {
1097                 d_fprintf(stderr, "\nERROR: "
1098                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1099                 poptPrintUsage(pc, stderr, 0);
1100                 exit(1);
1101         }
1102
1103         poptFreeContext(pc);
1104
1105         if (!override_logfile) {
1106                 char *lfile = NULL;
1107                 if (asprintf(&lfile,"%s/log.winbindd",
1108                                 get_dyn_LOGFILEBASE()) > 0) {
1109                         lp_set_logfile(lfile);
1110                         SAFE_FREE(lfile);
1111                 }
1112         }
1113         setup_logging("winbindd", log_stdout);
1114         reopen_logs();
1115
1116         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1117         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1118
1119         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1120                 DEBUG(0, ("error opening config file\n"));
1121                 exit(1);
1122         }
1123
1124         /* Initialise messaging system */
1125
1126         if (winbind_messaging_context() == NULL) {
1127                 exit(1);
1128         }
1129
1130         if (!reload_services_file(NULL)) {
1131                 DEBUG(0, ("error opening config file\n"));
1132                 exit(1);
1133         }
1134
1135         if (!directory_exist(lp_lockdir())) {
1136                 mkdir(lp_lockdir(), 0755);
1137         }
1138
1139         /* Setup names. */
1140
1141         if (!init_names())
1142                 exit(1);
1143
1144         load_interfaces();
1145
1146         if (!secrets_init()) {
1147
1148                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1149                 return False;
1150         }
1151
1152         /* Enable netbios namecache */
1153
1154         namecache_enable();
1155
1156         /* Unblock all signals we are interested in as they may have been
1157            blocked by the parent process. */
1158
1159         BlockSignals(False, SIGINT);
1160         BlockSignals(False, SIGQUIT);
1161         BlockSignals(False, SIGTERM);
1162         BlockSignals(False, SIGUSR1);
1163         BlockSignals(False, SIGUSR2);
1164         BlockSignals(False, SIGHUP);
1165         BlockSignals(False, SIGCHLD);
1166
1167         if (!interactive)
1168                 become_daemon(Fork, no_process_group);
1169
1170         pidfile_create("winbindd");
1171
1172 #if HAVE_SETPGID
1173         /*
1174          * If we're interactive we want to set our own process group for
1175          * signal management.
1176          */
1177         if (interactive && !no_process_group)
1178                 setpgid( (pid_t)0, (pid_t)0);
1179 #endif
1180
1181         TimeInit();
1182
1183         /* Don't use winbindd_reinit_after_fork here as
1184          * we're just starting up and haven't created any
1185          * winbindd-specific resources we must free yet. JRA.
1186          */
1187
1188         if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(),
1189                                                winbind_event_context(),
1190                                                false))) {
1191                 DEBUG(0,("reinit_after_fork() failed\n"));
1192                 exit(1);
1193         }
1194
1195         /* Setup signal handlers */
1196
1197         if (!winbindd_setup_sig_term_handler(true))
1198                 exit(1);
1199         if (!winbindd_setup_sig_hup_handler(NULL))
1200                 exit(1);
1201         if (!winbindd_setup_sig_chld_handler())
1202                 exit(1);
1203         if (!winbindd_setup_sig_usr2_handler())
1204                 exit(1);
1205
1206         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1207
1208         /*
1209          * Ensure all cache and idmap caches are consistent
1210          * and initialized before we startup.
1211          */
1212         if (!winbindd_cache_validate_and_initialize()) {
1213                 exit(1);
1214         }
1215
1216         /* get broadcast messages */
1217         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
1218
1219         /* React on 'smbcontrol winbindd reload-config' in the same way
1220            as to SIGHUP signal */
1221         messaging_register(winbind_messaging_context(), NULL,
1222                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1223         messaging_register(winbind_messaging_context(), NULL,
1224                            MSG_SHUTDOWN, msg_shutdown);
1225
1226         /* Handle online/offline messages. */
1227         messaging_register(winbind_messaging_context(), NULL,
1228                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1229         messaging_register(winbind_messaging_context(), NULL,
1230                            MSG_WINBIND_ONLINE, winbind_msg_online);
1231         messaging_register(winbind_messaging_context(), NULL,
1232                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1233
1234         messaging_register(winbind_messaging_context(), NULL,
1235                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1236
1237         messaging_register(winbind_messaging_context(), NULL,
1238                            MSG_WINBIND_VALIDATE_CACHE,
1239                            winbind_msg_validate_cache);
1240
1241         messaging_register(winbind_messaging_context(), NULL,
1242                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1243                            winbind_msg_dump_domain_list);
1244
1245         /* Register handler for MSG_DEBUG. */
1246         messaging_register(winbind_messaging_context(), NULL,
1247                            MSG_DEBUG,
1248                            winbind_msg_debug);
1249
1250         netsamlogon_cache_init(); /* Non-critical */
1251
1252         /* clear the cached list of trusted domains */
1253
1254         wcache_tdc_clear();
1255
1256         if (!init_domain_list()) {
1257                 DEBUG(0,("unable to initialize domain list\n"));
1258                 exit(1);
1259         }
1260
1261         init_idmap_child();
1262         init_locator_child();
1263
1264         smb_nscd_flush_user_cache();
1265         smb_nscd_flush_group_cache();
1266
1267         /* setup listen sockets */
1268
1269         if (!winbindd_setup_listeners()) {
1270                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1271                 exit(1);
1272         }
1273
1274         te = tevent_add_timer(winbind_event_context(), NULL, timeval_zero(),
1275                               rescan_trusted_domains, NULL);
1276         if (te == NULL) {
1277                 DEBUG(0, ("Could not trigger rescan_trusted_domains()\n"));
1278                 exit(1);
1279         }
1280
1281         TALLOC_FREE(frame);
1282         /* Loop waiting for requests */
1283         while (1) {
1284                 frame = talloc_stackframe();
1285
1286                 if (tevent_loop_once(winbind_event_context()) == -1) {
1287                         DEBUG(1, ("tevent_loop_once() failed: %s\n",
1288                                   strerror(errno)));
1289                         return 1;
1290                 }
1291
1292                 TALLOC_FREE(frame);
1293         }
1294
1295         return 0;
1296 }