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