source3/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 /* Reload configuration */
  32
  33 static BOOL reload_services_file(void)
  34 {
  35         BOOL ret;
  36
  37         if (lp_loaded()) {
  38                 pstring fname;
  39
  40                 pstrcpy(fname,lp_configfile());
  41                 if (file_exist(fname,NULL) && !strcsequal(fname,dyn_CONFIGFILE)) {
  42                         pstrcpy(dyn_CONFIGFILE,fname);
  43                 }
  44         }
  45
  46         reopen_logs();
  47         ret = lp_load(dyn_CONFIGFILE,False,False,True);
  48
  49         reopen_logs();
  50         load_interfaces();
  51
  52         return(ret);
  53 }
  54
  55
  56 #if DUMP_CORE
  57
  58 /**************************************************************************** **
  59  Prepare to dump a core file - carefully!
  60  **************************************************************************** */
  61
  62 static BOOL dump_core(void)
  63 {
  64         char *p;
  65         pstring dname;
  66         pstrcpy( dname, lp_logfile() );
  67         if ((p=strrchr(dname,'/')))
  68                 *p=0;
  69         pstrcat( dname, "/corefiles" );
  70         mkdir( dname, 0700 );
  71         sys_chown( dname, getuid(), getgid() );
  72         chmod( dname, 0700 );
  73         if ( chdir(dname) )
  74                 return( False );
  75         umask( ~(0700) );
  76
  77 #ifdef HAVE_GETRLIMIT
  78 #ifdef RLIMIT_CORE
  79         {
  80                 struct rlimit rlp;
  81                 getrlimit( RLIMIT_CORE, &rlp );
  82                 rlp.rlim_cur = MAX( 4*1024*1024, rlp.rlim_cur );
  83                 setrlimit( RLIMIT_CORE, &rlp );
  84                 getrlimit( RLIMIT_CORE, &rlp );
  85                 DEBUG( 3, ( "Core limits now %d %d\n", (int)rlp.rlim_cur, (int)rlp.rlim_max ) );
  86         }
  87 #endif
  88 #endif
  89
  90         DEBUG(0,("Dumping core in %s\n",dname));
  91         abort();
  92         return( True );
  93 } /* dump_core */
  94 #endif
  95
  96 /**************************************************************************** **
  97  Handle a fault..
  98  **************************************************************************** */
  99
 100 static void fault_quit(void)
 101 {
 102 #if DUMP_CORE
 103         dump_core();
 104 #endif
 105 }
 106
 107 static void winbindd_status(void)
 108 {
 109         struct winbindd_cli_state *tmp;
 110
 111         DEBUG(0, ("winbindd status:\n"));
 112
 113         /* Print client state information */
 114
 115         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
 116
 117         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
 118                 DEBUG(2, ("\tclient list:\n"));
 119                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
 120                         DEBUG(2, ("\t\tpid %lu, sock %d, rbl %d, wbl %d\n",
 121                                   (unsigned long)tmp->pid, tmp->sock, tmp->read_buf_len,
 122                                   tmp->write_buf_len));
 123                 }
 124         }
 125 }
 126
 127 /* Print winbindd status to log file */
 128
 129 static void print_winbindd_status(void)
 130 {
 131         winbindd_status();
 132         winbindd_cm_status();
 133 }
 134
 135 /* Flush client cache */
 136
 137 static void flush_caches(void)
 138 {
 139 #if 0
 140         /* Clear cached user and group enumation info */
 141         if (!opt_dual_daemon) /* Until we have coherent cache flush. */
 142                 wcache_flush_cache();
 143 #endif
 144
 145         /* We need to invalidate cached user list entries on a SIGHUP
 146            otherwise cached access denied errors due to restrict anonymous
 147            hang around until the sequence number changes. */
 148
 149         wcache_invalidate_cache();
 150 }
 151
 152 /* Handle the signal by unlinking socket and exiting */
 153
 154 static void terminate(void)
 155 {
 156         pstring path;
 157
 158         idmap_close();
 159
 160         /* Remove socket file */
 161         pstr_sprintf(path, "%s/%s",
 162                  WINBINDD_SOCKET_DIR, WINBINDD_SOCKET_NAME);
 163         unlink(path);
 164         exit(0);
 165 }
 166
 167 static BOOL do_sigterm;
 168
 169 static void termination_handler(int signum)
 170 {
 171         do_sigterm = True;
 172         sys_select_signal();
 173 }
 174
 175 static BOOL do_sigusr2;
 176
 177 static void sigusr2_handler(int signum)
 178 {
 179         do_sigusr2 = True;
 180         sys_select_signal();
 181 }
 182
 183 static BOOL do_sighup;
 184
 185 static void sighup_handler(int signum)
 186 {
 187         do_sighup = True;
 188         sys_select_signal();
 189 }
 190
 191 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 192 static void msg_reload_services(int msg_type, pid_t src, void *buf, size_t len)
 193 {
 194         /* Flush various caches */
 195         flush_caches();
 196         reload_services_file();
 197 }
 198
 199 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 200 static void msg_shutdown(int msg_type, pid_t src, void *buf, size_t len)
 201 {
 202         terminate();
 203 }
 204
 205 struct dispatch_table {
 206         enum winbindd_cmd cmd;
 207         enum winbindd_result (*fn)(struct winbindd_cli_state *state);
 208         const char *winbindd_cmd_name;
 209 };
 210
 211 static struct dispatch_table dispatch_table[] = {
 212
 213         /* User functions */
 214
 215         { WINBINDD_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
 216         { WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },
 217
 218         { WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
 219         { WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
 220         { WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },
 221
 222         { WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },
 223         { WINBINDD_GETUSERSIDS, winbindd_getusersids, "GETUSERSIDS" },
 224
 225         /* Group functions */
 226
 227         { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
 228         { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
 229         { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
 230         { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
 231         { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
 232         { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
 233
 234         /* PAM auth functions */
 235
 236         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 237         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 238         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 239
 240         /* Enumeration functions */
 241
 242         { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
 243         { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
 244         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains, "LIST_TRUSTDOM" },
 245         { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
 246
 247         /* SID related functions */
 248
 249         { WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
 250         { WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },
 251
 252         /* Lookup related functions */
 253
 254         { WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
 255         { WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
 256         { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
 257         { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
 258         { WINBINDD_ALLOCATE_RID, winbindd_allocate_rid, "ALLOCATE_RID" },
 259
 260         /* Miscellaneous */
 261
 262         { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
 263         { WINBINDD_PING, winbindd_ping, "PING" },
 264         { WINBINDD_INFO, winbindd_info, "INFO" },
 265         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version, "INTERFACE_VERSION" },
 266         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 267         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 268         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 269         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir, "WINBINDD_PRIV_PIPE_DIR" },
 270
 271         /* WINS functions */
 272
 273         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 274         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 275
 276         /* UNIX account management functions */
 277         { WINBINDD_CREATE_USER,                 winbindd_create_user,           "CREATE_USER"           },
 278         { WINBINDD_CREATE_GROUP,                winbindd_create_group,          "CREATE_GROUP"          },
 279         { WINBINDD_ADD_USER_TO_GROUP,           winbindd_add_user_to_group,     "ADD_USER_TO_GROUP"     },
 280         { WINBINDD_REMOVE_USER_FROM_GROUP,      winbindd_remove_user_from_group,"REMOVE_USER_FROM_GROUP"},
 281         { WINBINDD_SET_USER_PRIMARY_GROUP,      winbindd_set_user_primary_group,"SET_USER_PRIMARY_GROUP"},
 282         { WINBINDD_DELETE_USER,                 winbindd_delete_user,           "DELETE_USER"           },
 283         { WINBINDD_DELETE_GROUP,                winbindd_delete_group,          "DELETE_GROUP"          },
 284
 285         /* End of list */
 286
 287         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 288 };
 289
 290 static void process_request(struct winbindd_cli_state *state)
 291 {
 292         struct dispatch_table *table = dispatch_table;
 293
 294         /* Free response data - we may be interrupted and receive another
 295            command before being able to send this data off. */
 296
 297         SAFE_FREE(state->response.extra_data);
 298
 299         ZERO_STRUCT(state->response);
 300
 301         state->response.result = WINBINDD_ERROR;
 302         state->response.length = sizeof(struct winbindd_response);
 303
 304         /* Process command */
 305
 306         for (table = dispatch_table; table->fn; table++) {
 307                 if (state->request.cmd == table->cmd) {
 308                         DEBUG(10,("process_request: request fn %s\n", table->winbindd_cmd_name ));
 309                         state->response.result = table->fn(state);
 310                         break;
 311                 }
 312         }
 313
 314         if (!table->fn)
 315                 DEBUG(10,("process_request: unknown request fn number %d\n", (int)state->request.cmd ));
 316
 317         /* In case extra data pointer is NULL */
 318
 319         if (!state->response.extra_data)
 320                 state->response.length = sizeof(struct winbindd_response);
 321 }
 322
 323 /* Process a new connection by adding it to the client connection list */
 324
 325 static void new_connection(int listen_sock, BOOL privileged)
 326 {
 327         struct sockaddr_un sunaddr;
 328         struct winbindd_cli_state *state;
 329         socklen_t len;
 330         int sock;
 331
 332         /* Accept connection */
 333
 334         len = sizeof(sunaddr);
 335
 336         do {
 337                 sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
 338         } while (sock == -1 && errno == EINTR);
 339
 340         if (sock == -1)
 341                 return;
 342
 343         DEBUG(6,("accepted socket %d\n", sock));
 344
 345         /* Create new connection structure */
 346
 347         if ((state = (struct winbindd_cli_state *)
 348              malloc(sizeof(*state))) == NULL)
 349                 return;
 350
 351         ZERO_STRUCTP(state);
 352         state->sock = sock;
 353
 354         state->last_access = time(NULL);
 355
 356         state->privileged = privileged;
 357
 358         /* Add to connection list */
 359
 360         winbindd_add_client(state);
 361 }
 362
 363 /* Remove a client connection from client connection list */
 364
 365 static void remove_client(struct winbindd_cli_state *state)
 366 {
 367         /* It's a dead client - hold a funeral */
 368
 369         if (state != NULL) {
 370
 371                 /* Close socket */
 372
 373                 close(state->sock);
 374
 375                 /* Free any getent state */
 376
 377                 free_getent_state(state->getpwent_state);
 378                 free_getent_state(state->getgrent_state);
 379
 380                 /* We may have some extra data that was not freed if the
 381                    client was killed unexpectedly */
 382
 383                 SAFE_FREE(state->response.extra_data);
 384
 385                 /* Remove from list and free */
 386
 387                 winbindd_remove_client(state);
 388                 SAFE_FREE(state);
 389         }
 390 }
 391
 392
 393 /* Shutdown client connection which has been idle for the longest time */
 394
 395 static BOOL remove_idle_client(void)
 396 {
 397         struct winbindd_cli_state *state, *remove_state = NULL;
 398         time_t last_access = 0;
 399         int nidle = 0;
 400
 401         for (state = winbindd_client_list(); state; state = state->next) {
 402                 if (state->read_buf_len == 0 && state->write_buf_len == 0 &&
 403                                 !state->getpwent_state && !state->getgrent_state) {
 404                         nidle++;
 405                         if (!last_access || state->last_access < last_access) {
 406                                 last_access = state->last_access;
 407                                 remove_state = state;
 408                         }
 409                 }
 410         }
 411
 412         if (remove_state) {
 413                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 414                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 415                 remove_client(remove_state);
 416                 return True;
 417         }
 418
 419         return False;
 420 }
 421
 422 /* Process a complete received packet from a client */
 423
 424 void winbind_process_packet(struct winbindd_cli_state *state)
 425 {
 426         /* Process request */
 427
 428         /* Ensure null termination of entire request */
 429         state->request.null_term = '\0';
 430
 431         state->pid = state->request.pid;
 432
 433         process_request(state);
 434
 435         /* Update client state */
 436
 437         state->read_buf_len = 0;
 438         state->write_buf_len = sizeof(struct winbindd_response);
 439
 440         /* we might need to send it to the dual daemon */
 441         if (opt_dual_daemon) {
 442                 dual_send_request(state);
 443         }
 444 }
 445
 446 /* Read some data from a client connection */
 447
 448 void winbind_client_read(struct winbindd_cli_state *state)
 449 {
 450         int n;
 451
 452         /* Read data */
 453
 454         n = sys_read(state->sock, state->read_buf_len +
 455                  (char *)&state->request,
 456                  sizeof(state->request) - state->read_buf_len);
 457
 458         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) ));
 459
 460         /* Read failed, kill client */
 461
 462         if (n == -1 || n == 0) {
 463                 DEBUG(5,("read failed on sock %d, pid %lu: %s\n",
 464                          state->sock, (unsigned long)state->pid,
 465                          (n == -1) ? strerror(errno) : "EOF"));
 466
 467                 state->finished = True;
 468                 return;
 469         }
 470
 471         /* Update client state */
 472
 473         state->read_buf_len += n;
 474         state->last_access = time(NULL);
 475 }
 476
 477 /* Write some data to a client connection */
 478
 479 static void client_write(struct winbindd_cli_state *state)
 480 {
 481         char *data;
 482         int num_written;
 483
 484         /* Write some data */
 485         /*
 486          * The fancy calculation of data below allows us to handle the
 487          * case where write (sys_write) does not write all the data we
 488          * gave it. In that case, we will come back through here again
 489          * because of the loop above us, and we want to pick up where
 490          * we left off.
 491          */
 492
 493         if (!state->write_extra_data) {
 494
 495                 /* Write response structure */
 496
 497                 data = (char *)&state->response + sizeof(state->response) -
 498                         state->write_buf_len;
 499
 500         } else {
 501
 502                 /* Write extra data */
 503
 504                 data = (char *)state->response.extra_data +
 505                         state->response.length -
 506                         sizeof(struct winbindd_response) -
 507                         state->write_buf_len;
 508         }
 509
 510         num_written = sys_write(state->sock, data, state->write_buf_len);
 511
 512         DEBUG(10,("client_write: wrote %d bytes.\n", num_written ));
 513
 514         /* Write failed, kill cilent */
 515
 516         if (num_written == -1 || num_written == 0) {
 517
 518                 DEBUG(3,("write failed on sock %d, pid %lu: %s\n",
 519                          state->sock, (unsigned long)state->pid,
 520                          (num_written == -1) ? strerror(errno) : "EOF"));
 521
 522                 state->finished = True;
 523
 524                 SAFE_FREE(state->response.extra_data);
 525
 526                 return;
 527         }
 528
 529         /* Update client state */
 530
 531         state->write_buf_len -= num_written;
 532         state->last_access = time(NULL);
 533
 534         /* Have we written all data? */
 535
 536         if (state->write_buf_len == 0) {
 537
 538                 /* Take care of extra data */
 539
 540                 if (state->write_extra_data) {
 541
 542                         SAFE_FREE(state->response.extra_data);
 543
 544                         state->write_extra_data = False;
 545
 546                         DEBUG(10,("client_write: client_write: complete response written.\n"));
 547
 548                 } else if (state->response.length >
 549                            sizeof(struct winbindd_response)) {
 550
 551                         /* Start writing extra data */
 552
 553                         state->write_buf_len =
 554                                 state->response.length -
 555                                 sizeof(struct winbindd_response);
 556
 557                         DEBUG(10,("client_write: need to write %d extra data bytes.\n", (int)state->write_buf_len));
 558
 559                         state->write_extra_data = True;
 560                 }
 561         }
 562 }
 563
 564 /* Process incoming clients on listen_sock.  We use a tricky non-blocking,
 565    non-forking, non-threaded model which allows us to handle many
 566    simultaneous connections while remaining impervious to many denial of
 567    service attacks. */
 568
 569 static void process_loop(void)
 570 {
 571         /* We'll be doing this a lot */
 572
 573         while (1) {
 574                 struct winbindd_cli_state *state;
 575                 fd_set r_fds, w_fds;
 576                 int maxfd, listen_sock, listen_priv_sock, selret;
 577                 struct timeval timeout;
 578
 579                 /* Handle messages */
 580
 581                 message_dispatch();
 582
 583                 /* refresh the trusted domain cache */
 584
 585                 rescan_trusted_domains();
 586
 587                 /* Free up temporary memory */
 588
 589                 lp_talloc_free();
 590                 main_loop_talloc_free();
 591
 592                 /* Initialise fd lists for select() */
 593
 594                 listen_sock = open_winbindd_socket();
 595                 listen_priv_sock = open_winbindd_priv_socket();
 596
 597                 if (listen_sock == -1 || listen_priv_sock == -1) {
 598                         perror("open_winbind_socket");
 599                         exit(1);
 600                 }
 601
 602                 maxfd = MAX(listen_sock, listen_priv_sock);
 603
 604                 FD_ZERO(&r_fds);
 605                 FD_ZERO(&w_fds);
 606                 FD_SET(listen_sock, &r_fds);
 607                 FD_SET(listen_priv_sock, &r_fds);
 608
 609                 timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
 610                 timeout.tv_usec = 0;
 611
 612                 if (opt_dual_daemon) {
 613                         maxfd = dual_select_setup(&w_fds, maxfd);
 614                 }
 615
 616                 /* Set up client readers and writers */
 617
 618                 state = winbindd_client_list();
 619
 620                 while (state) {
 621
 622                         /* Dispose of client connection if it is marked as
 623                            finished */
 624
 625                         if (state->finished) {
 626                                 struct winbindd_cli_state *next = state->next;
 627
 628                                 remove_client(state);
 629                                 state = next;
 630                                 continue;
 631                         }
 632
 633                         /* Select requires we know the highest fd used */
 634
 635                         if (state->sock > maxfd)
 636                                 maxfd = state->sock;
 637
 638                         /* Add fd for reading */
 639
 640                         if (state->read_buf_len != sizeof(state->request))
 641                                 FD_SET(state->sock, &r_fds);
 642
 643                         /* Add fd for writing */
 644
 645                         if (state->write_buf_len)
 646                                 FD_SET(state->sock, &w_fds);
 647
 648                         state = state->next;
 649                 }
 650
 651                 /* Call select */
 652
 653                 selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
 654
 655                 if (selret == 0)
 656                         continue;
 657
 658                 if ((selret == -1 && errno != EINTR) || selret == 0) {
 659
 660                         /* Select error, something is badly wrong */
 661
 662                         perror("select");
 663                         exit(1);
 664                 }
 665
 666                 /* Create a new connection if listen_sock readable */
 667
 668                 if (selret > 0) {
 669
 670                         if (opt_dual_daemon) {
 671                                 dual_select(&w_fds);
 672                         }
 673
 674                         if (FD_ISSET(listen_sock, &r_fds)) {
 675                                 while (winbindd_num_clients() > WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 676                                         DEBUG(5,("winbindd: Exceeding %d client connections, removing idle connection.\n",
 677                                                 WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 678                                         if (!remove_idle_client()) {
 679                                                 DEBUG(0,("winbindd: Exceeding %d client connections, no idle connection found\n",
 680                                                         WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 681                                                 break;
 682                                         }
 683                                 }
 684                                 /* new, non-privileged connection */
 685                                 new_connection(listen_sock, False);
 686                         }
 687
 688                         if (FD_ISSET(listen_priv_sock, &r_fds)) {
 689                                 while (winbindd_num_clients() > WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 690                                         DEBUG(5,("winbindd: Exceeding %d client connections, removing idle connection.\n",
 691                                                 WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 692                                         if (!remove_idle_client()) {
 693                                                 DEBUG(0,("winbindd: Exceeding %d client connections, no idle connection found\n",
 694                                                         WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 695                                                 break;
 696                                         }
 697                                 }
 698                                 /* new, privileged connection */
 699                                 new_connection(listen_priv_sock, True);
 700                         }
 701
 702                         /* Process activity on client connections */
 703
 704                         for (state = winbindd_client_list(); state;
 705                              state = state->next) {
 706
 707                                 /* Data available for reading */
 708
 709                                 if (FD_ISSET(state->sock, &r_fds)) {
 710
 711                                         /* Read data */
 712
 713                                         winbind_client_read(state);
 714
 715                                         /*
 716                                          * If we have the start of a
 717                                          * packet, then check the
 718                                          * length field to make sure
 719                                          * the client's not talking
 720                                          * Mock Swedish.
 721                                          */
 722
 723                                         if (state->read_buf_len >= sizeof(uint32)
 724                                             && *(uint32 *) &state->request != sizeof(state->request)) {
 725                                                 DEBUG(0,("process_loop: Invalid request size from pid %lu: %d bytes sent, should be %ld\n",
 726                                                                 (unsigned long)state->request.pid, *(uint32 *) &state->request, (unsigned long)sizeof(state->request)));
 727                                                 DEBUGADD(0, ("This usually means that you are running old wbinfo, pam_winbind or libnss_winbind clients\n"));
 728
 729                                                 remove_client(state);
 730                                                 break;
 731                                         }
 732
 733                                         /* A request packet might be
 734                                            complete */
 735
 736                                         if (state->read_buf_len ==
 737                                             sizeof(state->request)) {
 738                                                 winbind_process_packet(state);
 739                                         }
 740                                 }
 741
 742                                 /* Data available for writing */
 743
 744                                 if (FD_ISSET(state->sock, &w_fds))
 745                                         client_write(state);
 746                         }
 747                 }
 748
 749 #if 0
 750                 winbindd_check_cache_size(time(NULL));
 751 #endif
 752
 753                 /* Check signal handling things */
 754
 755                 if (do_sigterm)
 756                         terminate();
 757
 758                 if (do_sighup) {
 759
 760                         DEBUG(3, ("got SIGHUP\n"));
 761
 762                         msg_reload_services(MSG_SMB_CONF_UPDATED, (pid_t) 0, NULL, 0);
 763                         do_sighup = False;
 764                 }
 765
 766                 if (do_sigusr2) {
 767                         print_winbindd_status();
 768                         do_sigusr2 = False;
 769                 }
 770         }
 771 }
 772
 773 /* Main function */
 774
 775 struct winbindd_state server_state;   /* Server state information */
 776
 777 int main(int argc, char **argv)
 778 {
 779         pstring logfile;
 780         static BOOL interactive = False;
 781         static BOOL Fork = True;
 782         static BOOL log_stdout = False;
 783         struct poptOption long_options[] = {
 784                 POPT_AUTOHELP
 785                 { "stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
 786                 { "foreground", 'F', POPT_ARG_VAL, &Fork, False, "Daemon in foreground mode" },
 787                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
 788                 { "single-daemon", 'Y', POPT_ARG_VAL, &opt_dual_daemon, False, "Single daemon mode" },
 789                 { "no-caching", 'n', POPT_ARG_VAL, &opt_nocache, False, "Disable caching" },
 790                 POPT_COMMON_SAMBA
 791                 POPT_TABLEEND
 792         };
 793         poptContext pc;
 794         int opt;
 795
 796         /* glibc (?) likes to print "User defined signal 1" and exit if a
 797            SIGUSR[12] is received before a handler is installed */
 798
 799         CatchSignal(SIGUSR1, SIG_IGN);
 800         CatchSignal(SIGUSR2, SIG_IGN);
 801
 802         fault_setup((void (*)(void *))fault_quit );
 803
 804         /* Initialise for running in non-root mode */
 805
 806         sec_init();
 807
 808         set_remote_machine_name("winbindd", False);
 809
 810         /* Set environment variable so we don't recursively call ourselves.
 811            This may also be useful interactively. */
 812
 813         setenv(WINBINDD_DONT_ENV, "1", 1);
 814
 815         /* Initialise samba/rpc client stuff */
 816
 817         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options,
 818                                                 POPT_CONTEXT_KEEP_FIRST);
 819
 820         while ((opt = poptGetNextOpt(pc)) != -1) {
 821                 switch (opt) {
 822                         /* Don't become a daemon */
 823                 case 'i':
 824                         interactive = True;
 825                         log_stdout = True;
 826                         Fork = False;
 827                         break;
 828                 }
 829         }
 830
 831
 832         if (log_stdout && Fork) {
 833                 printf("Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n");
 834                 poptPrintUsage(pc, stderr, 0);
 835                 exit(1);
 836         }
 837
 838         pstr_sprintf(logfile, "%s/log.winbindd", dyn_LOGFILEBASE);
 839         lp_set_logfile(logfile);
 840         setup_logging("winbindd", log_stdout);
 841         reopen_logs();
 842
 843         DEBUG(1, ("winbindd version %s started.\n", SAMBA_VERSION_STRING) );
 844         DEBUGADD( 1, ( "Copyright The Samba Team 2000-2004\n" ) );
 845
 846         if (!reload_services_file()) {
 847                 DEBUG(0, ("error opening config file\n"));
 848                 exit(1);
 849         }
 850
 851         /* Setup names. */
 852
 853         if (!init_names())
 854                 exit(1);
 855
 856         load_interfaces();
 857
 858         if (!secrets_init()) {
 859
 860                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
 861                 return False;
 862         }
 863
 864         /* Enable netbios namecache */
 865
 866         namecache_enable();
 867
 868         /* Check winbindd parameters are valid */
 869
 870         ZERO_STRUCT(server_state);
 871
 872         if (!winbindd_param_init())
 873                 return 1;
 874
 875         /* Winbind daemon initialisation */
 876
 877         if (!winbindd_upgrade_idmap())
 878                 return 1;
 879
 880         if (!idmap_init(lp_idmap_backend()))
 881                 return 1;
 882
 883         /* Unblock all signals we are interested in as they may have been
 884            blocked by the parent process. */
 885
 886         BlockSignals(False, SIGINT);
 887         BlockSignals(False, SIGQUIT);
 888         BlockSignals(False, SIGTERM);
 889         BlockSignals(False, SIGUSR1);
 890         BlockSignals(False, SIGUSR2);
 891         BlockSignals(False, SIGHUP);
 892
 893         /* Setup signal handlers */
 894
 895         CatchSignal(SIGINT, termination_handler);      /* Exit on these sigs */
 896         CatchSignal(SIGQUIT, termination_handler);
 897         CatchSignal(SIGTERM, termination_handler);
 898
 899         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
 900
 901         CatchSignal(SIGUSR2, sigusr2_handler);         /* Debugging sigs */
 902         CatchSignal(SIGHUP, sighup_handler);
 903
 904         if (!interactive)
 905                 become_daemon(Fork);
 906
 907         pidfile_create("winbindd");
 908
 909 #if HAVE_SETPGID
 910         /*
 911          * If we're interactive we want to set our own process group for
 912          * signal management.
 913          */
 914         if (interactive)
 915                 setpgid( (pid_t)0, (pid_t)0);
 916 #endif
 917
 918         if (opt_dual_daemon) {
 919                 do_dual_daemon();
 920         }
 921
 922         /* Initialise messaging system */
 923
 924         if (!message_init()) {
 925                 DEBUG(0, ("unable to initialise messaging system\n"));
 926                 exit(1);
 927         }
 928
 929         /* React on 'smbcontrol winbindd reload-config' in the same way
 930            as to SIGHUP signal */
 931         message_register(MSG_SMB_CONF_UPDATED, msg_reload_services);
 932         message_register(MSG_SHUTDOWN, msg_shutdown);
 933
 934         poptFreeContext(pc);
 935
 936         netsamlogon_cache_init(); /* Non-critical */
 937
 938         init_domain_list();
 939
 940         /* Loop waiting for requests */
 941
 942         process_loop();
 943
 944         trustdom_cache_shutdown();
 945
 946         return 0;
 947 }