source/nsswitch/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
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25 #include "includes.h"
  26 #include "winbindd.h"
  27
  28 BOOL opt_nocache = False;
  29 BOOL opt_dual_daemon = True;
  30
  31 extern BOOL override_logfile;
  32
  33 /* Reload configuration */
  34
  35 static BOOL reload_services_file(void)
  36 {
  37         BOOL ret;
  38
  39         if (lp_loaded()) {
  40                 pstring fname;
  41
  42                 pstrcpy(fname,lp_configfile());
  43                 if (file_exist(fname,NULL) && !strcsequal(fname,dyn_CONFIGFILE)) {
  44                         pstrcpy(dyn_CONFIGFILE,fname);
  45                 }
  46         }
  47
  48         reopen_logs();
  49         ret = lp_load(dyn_CONFIGFILE,False,False,True);
  50
  51         reopen_logs();
  52         load_interfaces();
  53
  54         return(ret);
  55 }
  56
  57
  58 #if DUMP_CORE
  59
  60 /**************************************************************************** **
  61  Prepare to dump a core file - carefully!
  62  **************************************************************************** */
  63
  64 static BOOL dump_core(void)
  65 {
  66         char *p;
  67         pstring dname;
  68         pstrcpy( dname, lp_logfile() );
  69         if ((p=strrchr(dname,'/')))
  70                 *p=0;
  71         pstrcat( dname, "/corefiles" );
  72         mkdir( dname, 0700 );
  73         sys_chown( dname, getuid(), getgid() );
  74         chmod( dname, 0700 );
  75         if ( chdir(dname) )
  76                 return( False );
  77         umask( ~(0700) );
  78
  79 #ifdef HAVE_GETRLIMIT
  80 #ifdef RLIMIT_CORE
  81         {
  82                 struct rlimit rlp;
  83                 getrlimit( RLIMIT_CORE, &rlp );
  84                 rlp.rlim_cur = MAX( 4*1024*1024, rlp.rlim_cur );
  85                 setrlimit( RLIMIT_CORE, &rlp );
  86                 getrlimit( RLIMIT_CORE, &rlp );
  87                 DEBUG( 3, ( "Core limits now %d %d\n", (int)rlp.rlim_cur, (int)rlp.rlim_max ) );
  88         }
  89 #endif
  90 #endif
  91
  92         DEBUG(0,("Dumping core in %s\n",dname));
  93         abort();
  94         return( True );
  95 } /* dump_core */
  96 #endif
  97
  98 /**************************************************************************** **
  99  Handle a fault..
 100  **************************************************************************** */
 101
 102 static void fault_quit(void)
 103 {
 104 #if DUMP_CORE
 105         dump_core();
 106 #endif
 107 }
 108
 109 static void winbindd_status(void)
 110 {
 111         struct winbindd_cli_state *tmp;
 112
 113         DEBUG(0, ("winbindd status:\n"));
 114
 115         /* Print client state information */
 116
 117         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
 118
 119         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
 120                 DEBUG(2, ("\tclient list:\n"));
 121                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
 122                         DEBUG(2, ("\t\tpid %lu, sock %d, rbl %d, wbl %d\n",
 123                                   (unsigned long)tmp->pid, tmp->sock, tmp->read_buf_len,
 124                                   tmp->write_buf_len));
 125                 }
 126         }
 127 }
 128
 129 /* Print winbindd status to log file */
 130
 131 static void print_winbindd_status(void)
 132 {
 133         winbindd_status();
 134         winbindd_cm_status();
 135 }
 136
 137 /* Flush client cache */
 138
 139 static void flush_caches(void)
 140 {
 141 #if 0
 142         /* Clear cached user and group enumation info */
 143         if (!opt_dual_daemon) /* Until we have coherent cache flush. */
 144                 wcache_flush_cache();
 145 #endif
 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
 151         wcache_invalidate_cache();
 152 }
 153
 154 /* Handle the signal by unlinking socket and exiting */
 155
 156 static void terminate(void)
 157 {
 158         pstring path;
 159
 160         idmap_close();
 161
 162         /* Remove socket file */
 163         pstr_sprintf(path, "%s/%s",
 164                  WINBINDD_SOCKET_DIR, WINBINDD_SOCKET_NAME);
 165         unlink(path);
 166         exit(0);
 167 }
 168
 169 static BOOL do_sigterm;
 170
 171 static void termination_handler(int signum)
 172 {
 173         do_sigterm = True;
 174         sys_select_signal();
 175 }
 176
 177 static BOOL do_sigusr2;
 178
 179 static void sigusr2_handler(int signum)
 180 {
 181         do_sigusr2 = True;
 182         sys_select_signal();
 183 }
 184
 185 static BOOL do_sighup;
 186
 187 static void sighup_handler(int signum)
 188 {
 189         do_sighup = True;
 190         sys_select_signal();
 191 }
 192
 193 static void sigchld_handler(int signum)
 194 {
 195         pid_t pid;
 196         int status;
 197
 198         while ((pid = wait(&status)) != -1 || errno == EINTR) {
 199                 continue; /* Reap children */
 200         }
 201         sys_select_signal();
 202 }
 203
 204 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 205 static void msg_reload_services(int msg_type, pid_t src, void *buf, size_t len)
 206 {
 207         /* Flush various caches */
 208         flush_caches();
 209         reload_services_file();
 210 }
 211
 212 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 213 static void msg_shutdown(int msg_type, pid_t src, void *buf, size_t len)
 214 {
 215         terminate();
 216 }
 217
 218 struct dispatch_table {
 219         enum winbindd_cmd cmd;
 220         enum winbindd_result (*fn)(struct winbindd_cli_state *state);
 221         const char *winbindd_cmd_name;
 222 };
 223
 224 static struct dispatch_table dispatch_table[] = {
 225
 226         /* User functions */
 227
 228         { WINBINDD_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
 229         { WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },
 230
 231         { WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
 232         { WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
 233         { WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },
 234
 235         { WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },
 236         { WINBINDD_GETUSERSIDS, winbindd_getusersids, "GETUSERSIDS" },
 237
 238         /* Group functions */
 239
 240         { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
 241         { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
 242         { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
 243         { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
 244         { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
 245         { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
 246
 247         /* PAM auth functions */
 248
 249         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 250         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 251         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 252
 253         /* Enumeration functions */
 254
 255         { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
 256         { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
 257         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains, "LIST_TRUSTDOM" },
 258         { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
 259
 260         /* SID related functions */
 261
 262         { WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
 263         { WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },
 264
 265         /* Lookup related functions */
 266
 267         { WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
 268         { WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
 269         { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
 270         { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
 271         { WINBINDD_ALLOCATE_RID, winbindd_allocate_rid, "ALLOCATE_RID" },
 272
 273         /* Miscellaneous */
 274
 275         { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
 276         { WINBINDD_PING, winbindd_ping, "PING" },
 277         { WINBINDD_INFO, winbindd_info, "INFO" },
 278         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version, "INTERFACE_VERSION" },
 279         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 280         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 281         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 282         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir, "WINBINDD_PRIV_PIPE_DIR" },
 283
 284         /* WINS functions */
 285
 286         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 287         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 288
 289         /* UNIX account management functions */
 290         { WINBINDD_CREATE_USER,                 winbindd_create_user,           "CREATE_USER"           },
 291         { WINBINDD_CREATE_GROUP,                winbindd_create_group,          "CREATE_GROUP"          },
 292         { WINBINDD_ADD_USER_TO_GROUP,           winbindd_add_user_to_group,     "ADD_USER_TO_GROUP"     },
 293         { WINBINDD_REMOVE_USER_FROM_GROUP,      winbindd_remove_user_from_group,"REMOVE_USER_FROM_GROUP"},
 294         { WINBINDD_SET_USER_PRIMARY_GROUP,      winbindd_set_user_primary_group,"SET_USER_PRIMARY_GROUP"},
 295         { WINBINDD_DELETE_USER,                 winbindd_delete_user,           "DELETE_USER"           },
 296         { WINBINDD_DELETE_GROUP,                winbindd_delete_group,          "DELETE_GROUP"          },
 297
 298         /* End of list */
 299
 300         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 301 };
 302
 303 static void process_request(struct winbindd_cli_state *state)
 304 {
 305         struct dispatch_table *table = dispatch_table;
 306
 307         /* Free response data - we may be interrupted and receive another
 308            command before being able to send this data off. */
 309
 310         SAFE_FREE(state->response.extra_data);
 311
 312         ZERO_STRUCT(state->response);
 313
 314         state->response.result = WINBINDD_ERROR;
 315         state->response.length = sizeof(struct winbindd_response);
 316
 317         /* Process command */
 318
 319         for (table = dispatch_table; table->fn; table++) {
 320                 if (state->request.cmd == table->cmd) {
 321                         DEBUG(10,("process_request: request fn %s\n", table->winbindd_cmd_name ));
 322                         state->response.result = table->fn(state);
 323                         break;
 324                 }
 325         }
 326
 327         if (!table->fn)
 328                 DEBUG(10,("process_request: unknown request fn number %d\n", (int)state->request.cmd ));
 329
 330         /* In case extra data pointer is NULL */
 331
 332         if (!state->response.extra_data)
 333                 state->response.length = sizeof(struct winbindd_response);
 334 }
 335
 336 /* Process a new connection by adding it to the client connection list */
 337
 338 static void new_connection(int listen_sock, BOOL privileged)
 339 {
 340         struct sockaddr_un sunaddr;
 341         struct winbindd_cli_state *state;
 342         socklen_t len;
 343         int sock;
 344
 345         /* Accept connection */
 346
 347         len = sizeof(sunaddr);
 348
 349         do {
 350                 sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
 351         } while (sock == -1 && errno == EINTR);
 352
 353         if (sock == -1)
 354                 return;
 355
 356         DEBUG(6,("accepted socket %d\n", sock));
 357
 358         /* Create new connection structure */
 359
 360         if ((state = SMB_MALLOC_P(struct winbindd_cli_state)) == NULL)
 361                 return;
 362
 363         ZERO_STRUCTP(state);
 364         state->sock = sock;
 365
 366         state->last_access = time(NULL);
 367
 368         state->privileged = privileged;
 369
 370         /* Add to connection list */
 371
 372         winbindd_add_client(state);
 373 }
 374
 375 /* Remove a client connection from client connection list */
 376
 377 static void remove_client(struct winbindd_cli_state *state)
 378 {
 379         /* It's a dead client - hold a funeral */
 380
 381         if (state != NULL) {
 382
 383                 /* Close socket */
 384
 385                 close(state->sock);
 386
 387                 /* Free any getent state */
 388
 389                 free_getent_state(state->getpwent_state);
 390                 free_getent_state(state->getgrent_state);
 391
 392                 /* We may have some extra data that was not freed if the
 393                    client was killed unexpectedly */
 394
 395                 SAFE_FREE(state->response.extra_data);
 396
 397                 /* Remove from list and free */
 398
 399                 winbindd_remove_client(state);
 400                 SAFE_FREE(state);
 401         }
 402 }
 403
 404
 405 /* Shutdown client connection which has been idle for the longest time */
 406
 407 static BOOL remove_idle_client(void)
 408 {
 409         struct winbindd_cli_state *state, *remove_state = NULL;
 410         time_t last_access = 0;
 411         int nidle = 0;
 412
 413         for (state = winbindd_client_list(); state; state = state->next) {
 414                 if (state->read_buf_len == 0 && state->write_buf_len == 0 &&
 415                                 !state->getpwent_state && !state->getgrent_state) {
 416                         nidle++;
 417                         if (!last_access || state->last_access < last_access) {
 418                                 last_access = state->last_access;
 419                                 remove_state = state;
 420                         }
 421                 }
 422         }
 423
 424         if (remove_state) {
 425                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 426                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 427                 remove_client(remove_state);
 428                 return True;
 429         }
 430
 431         return False;
 432 }
 433
 434 /* Process a complete received packet from a client */
 435
 436 void winbind_process_packet(struct winbindd_cli_state *state)
 437 {
 438         /* Process request */
 439
 440         /* Ensure null termination of entire request */
 441         state->request.null_term = '\0';
 442
 443         state->pid = state->request.pid;
 444
 445         process_request(state);
 446
 447         /* Update client state */
 448
 449         state->read_buf_len = 0;
 450         state->write_buf_len = sizeof(struct winbindd_response);
 451
 452         /* we might need to send it to the dual daemon */
 453         if (opt_dual_daemon) {
 454                 dual_send_request(state);
 455         }
 456 }
 457
 458 /* Read some data from a client connection */
 459
 460 void winbind_client_read(struct winbindd_cli_state *state)
 461 {
 462         int n;
 463
 464         /* Read data */
 465
 466         n = sys_read(state->sock, state->read_buf_len +
 467                  (char *)&state->request,
 468                  sizeof(state->request) - state->read_buf_len);
 469
 470         DEBUG(10,("client_read: read %d bytes. Need %ld more for a full request.\n", n, (unsigned long)(sizeof(state->request) - n - state->read_buf_len) ));
 471
 472         /* Read failed, kill client */
 473
 474         if (n == -1 || n == 0) {
 475                 DEBUG(5,("read failed on sock %d, pid %lu: %s\n",
 476                          state->sock, (unsigned long)state->pid,
 477                          (n == -1) ? strerror(errno) : "EOF"));
 478
 479                 state->finished = True;
 480                 return;
 481         }
 482
 483         /* Update client state */
 484
 485         state->read_buf_len += n;
 486         state->last_access = time(NULL);
 487 }
 488
 489 /* Write some data to a client connection */
 490
 491 static void client_write(struct winbindd_cli_state *state)
 492 {
 493         char *data;
 494         int num_written;
 495
 496         /* Write some data */
 497         /*
 498          * The fancy calculation of data below allows us to handle the
 499          * case where write (sys_write) does not write all the data we
 500          * gave it. In that case, we will come back through here again
 501          * because of the loop above us, and we want to pick up where
 502          * we left off.
 503          */
 504
 505         if (!state->write_extra_data) {
 506
 507                 /* Write response structure */
 508
 509                 data = (char *)&state->response + sizeof(state->response) -
 510                         state->write_buf_len;
 511
 512         } else {
 513
 514                 /* Write extra data */
 515
 516                 data = (char *)state->response.extra_data +
 517                         state->response.length -
 518                         sizeof(struct winbindd_response) -
 519                         state->write_buf_len;
 520         }
 521
 522         num_written = sys_write(state->sock, data, state->write_buf_len);
 523
 524         DEBUG(10,("client_write: wrote %d bytes.\n", num_written ));
 525
 526         /* Write failed, kill cilent */
 527
 528         if (num_written == -1 || num_written == 0) {
 529
 530                 DEBUG(3,("write failed on sock %d, pid %lu: %s\n",
 531                          state->sock, (unsigned long)state->pid,
 532                          (num_written == -1) ? strerror(errno) : "EOF"));
 533
 534                 state->finished = True;
 535
 536                 SAFE_FREE(state->response.extra_data);
 537
 538                 return;
 539         }
 540
 541         /* Update client state */
 542
 543         state->write_buf_len -= num_written;
 544         state->last_access = time(NULL);
 545
 546         /* Have we written all data? */
 547
 548         if (state->write_buf_len == 0) {
 549
 550                 /* Take care of extra data */
 551
 552                 if (state->write_extra_data) {
 553
 554                         SAFE_FREE(state->response.extra_data);
 555
 556                         state->write_extra_data = False;
 557
 558                         DEBUG(10,("client_write: client_write: complete response written.\n"));
 559
 560                 } else if (state->response.length >
 561                            sizeof(struct winbindd_response)) {
 562
 563                         /* Start writing extra data */
 564
 565                         state->write_buf_len =
 566                                 state->response.length -
 567                                 sizeof(struct winbindd_response);
 568
 569                         DEBUG(10,("client_write: need to write %d extra data bytes.\n", (int)state->write_buf_len));
 570
 571                         state->write_extra_data = True;
 572                 }
 573         }
 574 }
 575
 576 /* Process incoming clients on listen_sock.  We use a tricky non-blocking,
 577    non-forking, non-threaded model which allows us to handle many
 578    simultaneous connections while remaining impervious to many denial of
 579    service attacks. */
 580
 581 static void process_loop(void)
 582 {
 583         /* We'll be doing this a lot */
 584
 585         while (1) {
 586                 struct winbindd_cli_state *state;
 587                 fd_set r_fds, w_fds;
 588                 int maxfd, listen_sock, listen_priv_sock, selret;
 589                 struct timeval timeout;
 590
 591         again:
 592                 /* Handle messages */
 593
 594                 message_dispatch();
 595
 596                 /* refresh the trusted domain cache */
 597
 598                 rescan_trusted_domains();
 599
 600                 /* Free up temporary memory */
 601
 602                 lp_talloc_free();
 603                 main_loop_talloc_free();
 604
 605                 /* Initialise fd lists for select() */
 606
 607                 listen_sock = open_winbindd_socket();
 608                 listen_priv_sock = open_winbindd_priv_socket();
 609
 610                 if (listen_sock == -1 || listen_priv_sock == -1) {
 611                         perror("open_winbind_socket");
 612                         exit(1);
 613                 }
 614
 615                 maxfd = MAX(listen_sock, listen_priv_sock);
 616
 617                 FD_ZERO(&r_fds);
 618                 FD_ZERO(&w_fds);
 619                 FD_SET(listen_sock, &r_fds);
 620                 FD_SET(listen_priv_sock, &r_fds);
 621
 622                 timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
 623                 timeout.tv_usec = 0;
 624
 625                 if (opt_dual_daemon) {
 626                         maxfd = dual_select_setup(&w_fds, maxfd);
 627                 }
 628
 629                 /* Set up client readers and writers */
 630
 631                 state = winbindd_client_list();
 632
 633                 while (state) {
 634
 635                         /* Dispose of client connection if it is marked as
 636                            finished */
 637
 638                         if (state->finished) {
 639                                 struct winbindd_cli_state *next = state->next;
 640
 641                                 remove_client(state);
 642                                 state = next;
 643                                 continue;
 644                         }
 645
 646                         /* Select requires we know the highest fd used */
 647
 648                         if (state->sock > maxfd)
 649                                 maxfd = state->sock;
 650
 651                         /* Add fd for reading */
 652
 653                         if (state->read_buf_len != sizeof(state->request))
 654                                 FD_SET(state->sock, &r_fds);
 655
 656                         /* Add fd for writing */
 657
 658                         if (state->write_buf_len)
 659                                 FD_SET(state->sock, &w_fds);
 660
 661                         state = state->next;
 662                 }
 663
 664                 /* Call select */
 665
 666                 selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
 667
 668                 if (selret == 0)
 669                         continue;
 670
 671                 if ((selret == -1 && errno != EINTR) || selret == 0) {
 672
 673                         /* Select error, something is badly wrong */
 674
 675                         perror("select");
 676                         exit(1);
 677                 }
 678
 679                 /* Create a new connection if listen_sock readable */
 680
 681                 if (selret > 0) {
 682
 683                         if (opt_dual_daemon) {
 684                                 dual_select(&w_fds);
 685                         }
 686
 687                         if (FD_ISSET(listen_sock, &r_fds)) {
 688                                 while (winbindd_num_clients() > WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 689                                         DEBUG(5,("winbindd: Exceeding %d client connections, removing idle connection.\n",
 690                                                 WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 691                                         if (!remove_idle_client()) {
 692                                                 DEBUG(0,("winbindd: Exceeding %d client connections, no idle connection found\n",
 693                                                         WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 694                                                 break;
 695                                         }
 696                                 }
 697                                 /* new, non-privileged connection */
 698                                 new_connection(listen_sock, False);
 699                         }
 700
 701                         if (FD_ISSET(listen_priv_sock, &r_fds)) {
 702                                 while (winbindd_num_clients() > WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 703                                         DEBUG(5,("winbindd: Exceeding %d client connections, removing idle connection.\n",
 704                                                 WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 705                                         if (!remove_idle_client()) {
 706                                                 DEBUG(0,("winbindd: Exceeding %d client connections, no idle connection found\n",
 707                                                         WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 708                                                 break;
 709                                         }
 710                                 }
 711                                 /* new, privileged connection */
 712                                 new_connection(listen_priv_sock, True);
 713                         }
 714
 715                         /* Process activity on client connections */
 716
 717                         for (state = winbindd_client_list(); state;
 718                              state = state->next) {
 719
 720                                 /* Data available for writing */
 721
 722                                 if (FD_ISSET(state->sock, &w_fds))
 723                                         client_write(state);
 724                         }
 725
 726                         for (state = winbindd_client_list(); state;
 727                              state = state->next) {
 728
 729                                 /* Data available for reading */
 730
 731                                 if (FD_ISSET(state->sock, &r_fds)) {
 732
 733                                         /* Read data */
 734
 735                                         winbind_client_read(state);
 736
 737                                         /*
 738                                          * If we have the start of a
 739                                          * packet, then check the
 740                                          * length field to make sure
 741                                          * the client's not talking
 742                                          * Mock Swedish.
 743                                          */
 744
 745                                         if (state->read_buf_len >= sizeof(uint32)
 746                                             && *(uint32 *) &state->request != sizeof(state->request)) {
 747                                                 DEBUG(0,("process_loop: Invalid request size from pid %lu: %d bytes sent, should be %ld\n",
 748                                                                 (unsigned long)state->request.pid, *(uint32 *) &state->request, (unsigned long)sizeof(state->request)));
 749                                                 DEBUGADD(0, ("This usually means that you are running old wbinfo, pam_winbind or libnss_winbind clients\n"));
 750
 751                                                 remove_client(state);
 752                                                 break;
 753                                         }
 754
 755                                         /* A request packet might be
 756                                            complete */
 757
 758                                         if (state->read_buf_len ==
 759                                             sizeof(state->request)) {
 760                                                 winbind_process_packet(state);
 761                                                 winbindd_demote_client(state);
 762                                                 goto again;
 763                                         }
 764                                 }
 765                         }
 766                 }
 767
 768 #if 0
 769                 winbindd_check_cache_size(time(NULL));
 770 #endif
 771
 772                 /* Check signal handling things */
 773
 774                 if (do_sigterm)
 775                         terminate();
 776
 777                 if (do_sighup) {
 778
 779                         DEBUG(3, ("got SIGHUP\n"));
 780
 781                         msg_reload_services(MSG_SMB_CONF_UPDATED, (pid_t) 0, NULL, 0);
 782                         do_sighup = False;
 783                 }
 784
 785                 if (do_sigusr2) {
 786                         print_winbindd_status();
 787                         do_sigusr2 = False;
 788                 }
 789         }
 790 }
 791
 792 /* Main function */
 793
 794 struct winbindd_state server_state;   /* Server state information */
 795
 796 int main(int argc, char **argv)
 797 {
 798         pstring logfile;
 799         static BOOL interactive = False;
 800         static BOOL Fork = True;
 801         static BOOL log_stdout = False;
 802         struct poptOption long_options[] = {
 803                 POPT_AUTOHELP
 804                 { "stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
 805                 { "foreground", 'F', POPT_ARG_VAL, &Fork, False, "Daemon in foreground mode" },
 806                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
 807                 { "single-daemon", 'Y', POPT_ARG_VAL, &opt_dual_daemon, False, "Single daemon mode" },
 808                 { "no-caching", 'n', POPT_ARG_VAL, &opt_nocache, True, "Disable caching" },
 809                 POPT_COMMON_SAMBA
 810                 POPT_TABLEEND
 811         };
 812         poptContext pc;
 813         int opt;
 814
 815         /* glibc (?) likes to print "User defined signal 1" and exit if a
 816            SIGUSR[12] is received before a handler is installed */
 817
 818         CatchSignal(SIGUSR1, SIG_IGN);
 819         CatchSignal(SIGUSR2, SIG_IGN);
 820
 821         fault_setup((void (*)(void *))fault_quit );
 822
 823         /* Initialise for running in non-root mode */
 824
 825         sec_init();
 826
 827         set_remote_machine_name("winbindd", False);
 828
 829         /* Set environment variable so we don't recursively call ourselves.
 830            This may also be useful interactively. */
 831
 832         setenv(WINBINDD_DONT_ENV, "1", 1);
 833
 834         /* Initialise samba/rpc client stuff */
 835
 836         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options,
 837                                                 POPT_CONTEXT_KEEP_FIRST);
 838
 839         while ((opt = poptGetNextOpt(pc)) != -1) {
 840                 switch (opt) {
 841                         /* Don't become a daemon */
 842                 case 'i':
 843                         interactive = True;
 844                         log_stdout = True;
 845                         Fork = False;
 846                         break;
 847                 }
 848         }
 849
 850
 851         if (log_stdout && Fork) {
 852                 printf("Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n");
 853                 poptPrintUsage(pc, stderr, 0);
 854                 exit(1);
 855         }
 856
 857         if (!override_logfile) {
 858                 pstr_sprintf(logfile, "%s/log.winbindd", dyn_LOGFILEBASE);
 859                 lp_set_logfile(logfile);
 860         }
 861         setup_logging("winbindd", log_stdout);
 862         reopen_logs();
 863
 864         DEBUG(1, ("winbindd version %s started.\n", SAMBA_VERSION_STRING) );
 865         DEBUGADD( 1, ( "Copyright The Samba Team 2000-2004\n" ) );
 866
 867         if (!reload_services_file()) {
 868                 DEBUG(0, ("error opening config file\n"));
 869                 exit(1);
 870         }
 871
 872         /* Setup names. */
 873
 874         if (!init_names())
 875                 exit(1);
 876
 877         load_interfaces();
 878
 879         if (!secrets_init()) {
 880
 881                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
 882                 return False;
 883         }
 884
 885         /* Enable netbios namecache */
 886
 887         namecache_enable();
 888
 889         /* Check winbindd parameters are valid */
 890
 891         ZERO_STRUCT(server_state);
 892
 893         /* Winbind daemon initialisation */
 894
 895         if ( (!winbindd_param_init()) || (!winbindd_upgrade_idmap()) ||
 896              (!idmap_init(lp_idmap_backend())) ) {
 897                 DEBUG(1, ("Could not init idmap -- netlogon proxy only\n"));
 898                 idmap_proxyonly();
 899         }
 900
 901         generate_wellknown_sids();
 902
 903         /* Unblock all signals we are interested in as they may have been
 904            blocked by the parent process. */
 905
 906         BlockSignals(False, SIGINT);
 907         BlockSignals(False, SIGQUIT);
 908         BlockSignals(False, SIGTERM);
 909         BlockSignals(False, SIGUSR1);
 910         BlockSignals(False, SIGUSR2);
 911         BlockSignals(False, SIGHUP);
 912         BlockSignals(False, SIGCHLD);
 913
 914         /* Setup signal handlers */
 915
 916         CatchSignal(SIGINT, termination_handler);      /* Exit on these sigs */
 917         CatchSignal(SIGQUIT, termination_handler);
 918         CatchSignal(SIGTERM, termination_handler);
 919         CatchSignal(SIGCHLD, sigchld_handler);
 920
 921         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
 922
 923         CatchSignal(SIGUSR2, sigusr2_handler);         /* Debugging sigs */
 924         CatchSignal(SIGHUP, sighup_handler);
 925
 926         if (!interactive)
 927                 become_daemon(Fork);
 928
 929         pidfile_create("winbindd");
 930
 931 #if HAVE_SETPGID
 932         /*
 933          * If we're interactive we want to set our own process group for
 934          * signal management.
 935          */
 936         if (interactive)
 937                 setpgid( (pid_t)0, (pid_t)0);
 938 #endif
 939
 940         if (opt_dual_daemon) {
 941                 do_dual_daemon();
 942         }
 943
 944         /* Initialise messaging system */
 945
 946         if (!message_init()) {
 947                 DEBUG(0, ("unable to initialise messaging system\n"));
 948                 exit(1);
 949         }
 950
 951         /* React on 'smbcontrol winbindd reload-config' in the same way
 952            as to SIGHUP signal */
 953         message_register(MSG_SMB_CONF_UPDATED, msg_reload_services);
 954         message_register(MSG_SHUTDOWN, msg_shutdown);
 955
 956         poptFreeContext(pc);
 957
 958         netsamlogon_cache_init(); /* Non-critical */
 959
 960         init_domain_list();
 961
 962         /* Loop waiting for requests */
 963
 964         process_loop();
 965
 966         trustdom_cache_shutdown();
 967
 968         return 0;
 969 }