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    Copyright (C) Volker Lendecke 2004
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 2 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software
  23    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24 */
  25
  26 #include "includes.h"
  27 #include "winbindd.h"
  28
  29 BOOL opt_nocache = False;
  30 static BOOL interactive = False;
  31
  32 extern BOOL override_logfile;
  33
  34 /* Reload configuration */
  35
  36 static BOOL reload_services_file(void)
  37 {
  38         BOOL ret;
  39
  40         if (lp_loaded()) {
  41                 pstring fname;
  42
  43                 pstrcpy(fname,lp_configfile());
  44                 if (file_exist(fname,NULL) && !strcsequal(fname,dyn_CONFIGFILE)) {
  45                         pstrcpy(dyn_CONFIGFILE,fname);
  46                 }
  47         }
  48
  49         reopen_logs();
  50         ret = lp_load(dyn_CONFIGFILE,False,False,True);
  51
  52         reopen_logs();
  53         load_interfaces();
  54
  55         return(ret);
  56 }
  57
  58
  59 #if DUMP_CORE
  60
  61 /**************************************************************************** **
  62  Prepare to dump a core file - carefully!
  63  **************************************************************************** */
  64
  65 static BOOL dump_core(void)
  66 {
  67         char *p;
  68         pstring dname;
  69         pstrcpy( dname, lp_logfile() );
  70         if ((p=strrchr(dname,'/')))
  71                 *p=0;
  72         pstrcat( dname, "/corefiles" );
  73         mkdir( dname, 0700 );
  74         sys_chown( dname, getuid(), getgid() );
  75         chmod( dname, 0700 );
  76         if ( chdir(dname) )
  77                 return( False );
  78         umask( ~(0700) );
  79
  80 #ifdef HAVE_GETRLIMIT
  81 #ifdef RLIMIT_CORE
  82         {
  83                 struct rlimit rlp;
  84                 getrlimit( RLIMIT_CORE, &rlp );
  85                 rlp.rlim_cur = MAX( 4*1024*1024, rlp.rlim_cur );
  86                 setrlimit( RLIMIT_CORE, &rlp );
  87                 getrlimit( RLIMIT_CORE, &rlp );
  88                 DEBUG( 3, ( "Core limits now %d %d\n", (int)rlp.rlim_cur, (int)rlp.rlim_max ) );
  89         }
  90 #endif
  91 #endif
  92
  93         DEBUG(0,("Dumping core in %s\n",dname));
  94         abort();
  95         return( True );
  96 } /* dump_core */
  97 #endif
  98
  99 /**************************************************************************** **
 100  Handle a fault..
 101  **************************************************************************** */
 102
 103 static void fault_quit(void)
 104 {
 105 #if DUMP_CORE
 106         dump_core();
 107 #endif
 108 }
 109
 110 static void winbindd_status(void)
 111 {
 112         struct winbindd_cli_state *tmp;
 113
 114         DEBUG(0, ("winbindd status:\n"));
 115
 116         /* Print client state information */
 117
 118         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
 119
 120         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
 121                 DEBUG(2, ("\tclient list:\n"));
 122                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
 123                         DEBUG(2, ("\t\tpid %lu, sock %d, rbl %d, wbl %d\n",
 124                                   (unsigned long)tmp->pid, tmp->sock, tmp->read_buf_len,
 125                                   tmp->write_buf_len));
 126                 }
 127         }
 128 }
 129
 130 /* Print winbindd status to log file */
 131
 132 static void print_winbindd_status(void)
 133 {
 134         winbindd_status();
 135 }
 136
 137 /* Flush client cache */
 138
 139 static void flush_caches(void)
 140 {
 141         /* We need to invalidate cached user list entries on a SIGHUP
 142            otherwise cached access denied errors due to restrict anonymous
 143            hang around until the sequence number changes. */
 144
 145         wcache_invalidate_cache();
 146 }
 147
 148 /* Handle the signal by unlinking socket and exiting */
 149
 150 static void terminate(void)
 151 {
 152         pstring path;
 153
 154         idmap_close();
 155
 156         /* Remove socket file */
 157         pstr_sprintf(path, "%s/%s",
 158                  WINBINDD_SOCKET_DIR, WINBINDD_SOCKET_NAME);
 159         unlink(path);
 160
 161 #if 0
 162         if (interactive) {
 163                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 164                 char *description = talloc_describe_all(mem_ctx);
 165
 166                 DEBUG(3, ("tallocs left:\n%s\n", description));
 167                 talloc_destroy(mem_ctx);
 168         }
 169 #endif
 170
 171         exit(0);
 172 }
 173
 174 static BOOL do_sigterm;
 175
 176 static void termination_handler(int signum)
 177 {
 178         do_sigterm = True;
 179         sys_select_signal(signum);
 180 }
 181
 182 static BOOL do_sigusr2;
 183
 184 static void sigusr2_handler(int signum)
 185 {
 186         do_sigusr2 = True;
 187         sys_select_signal(SIGUSR2);
 188 }
 189
 190 static BOOL do_sighup;
 191
 192 static void sighup_handler(int signum)
 193 {
 194         do_sighup = True;
 195         sys_select_signal(SIGHUP);
 196 }
 197
 198 static BOOL do_sigchld;
 199
 200 static void sigchld_handler(int signum)
 201 {
 202         do_sigchld = True;
 203         sys_select_signal(SIGCHLD);
 204 }
 205
 206 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 207 static void msg_reload_services(int msg_type, pid_t src, void *buf, size_t len)
 208 {
 209         /* Flush various caches */
 210         flush_caches();
 211         reload_services_file();
 212 }
 213
 214 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 215 static void msg_shutdown(int msg_type, pid_t src, void *buf, size_t len)
 216 {
 217         terminate();
 218 }
 219
 220 static struct winbindd_dispatch_table {
 221         enum winbindd_cmd cmd;
 222         void (*fn)(struct winbindd_cli_state *state);
 223         const char *winbindd_cmd_name;
 224 } 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         { WINBINDD_GETUSERDOMGROUPS, winbindd_getuserdomgroups,
 238           "GETUSERDOMGROUPS" },
 239         { WINBINDD_QUERY_ALIASMEM, winbindd_query_aliasmem,
 240           "QUERY_ALIASMEM" },
 241         { WINBINDD_QUERY_GROUPMEM, winbindd_group_members,
 242           "QUERY_GROUPMEM" },
 243
 244         /* Group functions */
 245
 246         { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
 247         { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
 248         { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
 249         { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
 250         { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
 251         { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
 252
 253         /* PAM auth functions */
 254
 255         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 256         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 257         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 258
 259         /* Enumeration functions */
 260
 261         { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
 262         { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
 263         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 264           "LIST_TRUSTDOM" },
 265         { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
 266
 267         /* SID related functions */
 268
 269         { WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
 270         { WINBINDD_LOOKUPSIDS, winbindd_lookupsids, "LOOKUPSIDS" },
 271         { WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },
 272
 273         /* Lookup related functions */
 274
 275         { WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
 276         { WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
 277         { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
 278         { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
 279         { WINBINDD_ALLOCATE_RID, winbindd_allocate_rid, "ALLOCATE_RID" },
 280         { WINBINDD_ALLOCATE_RID_AND_GID, winbindd_allocate_rid_and_gid,
 281           "ALLOCATE_RID_AND_GID" },
 282
 283         /* Miscellaneous */
 284
 285         { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
 286         { WINBINDD_PING, winbindd_ping, "PING" },
 287         { WINBINDD_INFO, winbindd_info, "INFO" },
 288         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 289           "INTERFACE_VERSION" },
 290         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 291         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 292         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 293         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 294           "WINBINDD_PRIV_PIPE_DIR" },
 295         { WINBINDD_GETDCNAME, winbindd_getdcname, "GETDCNAME" },
 296
 297         /* WINS functions */
 298
 299         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 300         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 301
 302         /* End of list */
 303
 304         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 305 };
 306
 307 static void process_request(struct winbindd_cli_state *state)
 308 {
 309         struct winbindd_dispatch_table *table = dispatch_table;
 310
 311         /* Free response data - we may be interrupted and receive another
 312            command before being able to send this data off. */
 313
 314         SAFE_FREE(state->response.extra_data);
 315
 316         ZERO_STRUCT(state->response);
 317
 318         state->response.result = WINBINDD_PENDING;
 319         state->response.length = sizeof(struct winbindd_response);
 320
 321         state->mem_ctx = talloc_init("winbind request");
 322         if (state->mem_ctx == NULL)
 323                 return;
 324
 325         /* Process command */
 326
 327         for (table = dispatch_table; table->fn; table++) {
 328                 if (state->request.cmd == table->cmd) {
 329                         DEBUG(10,("process_request: request fn %s\n",
 330                                   table->winbindd_cmd_name ));
 331                         table->fn(state);
 332                         break;
 333                 }
 334         }
 335
 336         if (!table->fn) {
 337                 DEBUG(10,("process_request: unknown request fn number %d\n",
 338                           (int)state->request.cmd ));
 339                 request_error(state);
 340         }
 341 }
 342
 343 /*
 344  * A list of file descriptors being monitored by select in the main processing
 345  * loop. fd_event->handler is called whenever the socket is readable/writable.
 346  */
 347
 348 static struct fd_event *fd_events = NULL;
 349
 350 void add_fd_event(struct fd_event *ev)
 351 {
 352         struct fd_event *match;
 353
 354         /* only add unique fd_event structs */
 355
 356         for (match=fd_events; match; match=match->next ) {
 357 #ifdef DEVELOPER
 358                 SMB_ASSERT( match != ev );
 359 #else
 360                 if ( match == ev )
 361                         return;
 362 #endif
 363         }
 364
 365         DLIST_ADD(fd_events, ev);
 366 }
 367
 368 void remove_fd_event(struct fd_event *ev)
 369 {
 370         DLIST_REMOVE(fd_events, ev);
 371 }
 372
 373 /*
 374  * Handler for fd_events to complete a read/write request, set up by
 375  * setup_async_read/setup_async_write.
 376  */
 377
 378 static void rw_callback(struct fd_event *event, int flags)
 379 {
 380         size_t todo;
 381         ssize_t done = 0;
 382
 383         todo = event->length - event->done;
 384
 385         if (event->flags & EVENT_FD_WRITE) {
 386                 SMB_ASSERT(flags == EVENT_FD_WRITE);
 387                 done = sys_write(event->fd,
 388                                  &((char *)event->data)[event->done],
 389                                  todo);
 390
 391                 if (done <= 0) {
 392                         event->flags = 0;
 393                         event->finished(event->private_data, False);
 394                         return;
 395                 }
 396         }
 397
 398         if (event->flags & EVENT_FD_READ) {
 399                 SMB_ASSERT(flags == EVENT_FD_READ);
 400                 done = sys_read(event->fd, &((char *)event->data)[event->done],
 401                                 todo);
 402
 403                 if (done <= 0) {
 404                         event->flags = 0;
 405                         event->finished(event->private_data, False);
 406                         return;
 407                 }
 408         }
 409
 410         event->done += done;
 411
 412         if (event->done == event->length) {
 413                 event->flags = 0;
 414                 event->finished(event->private_data, True);
 415         }
 416 }
 417
 418 /*
 419  * Request an async read/write on a fd_event structure. (*finished) is called
 420  * when the request is completed or an error had occurred.
 421  */
 422
 423 void setup_async_read(struct fd_event *event, void *data, size_t length,
 424                       void (*finished)(void *private_data, BOOL success),
 425                       void *private_data)
 426 {
 427         SMB_ASSERT(event->flags == 0);
 428         event->data = data;
 429         event->length = length;
 430         event->done = 0;
 431         event->handler = rw_callback;
 432         event->finished = finished;
 433         event->private_data = private_data;
 434         event->flags = EVENT_FD_READ;
 435 }
 436
 437 void setup_async_write(struct fd_event *event, void *data, size_t length,
 438                        void (*finished)(void *private_data, BOOL success),
 439                        void *private_data)
 440 {
 441         SMB_ASSERT(event->flags == 0);
 442         event->data = data;
 443         event->length = length;
 444         event->done = 0;
 445         event->handler = rw_callback;
 446         event->finished = finished;
 447         event->private_data = private_data;
 448         event->flags = EVENT_FD_WRITE;
 449 }
 450
 451 /*
 452  * This is the main event loop of winbind requests. It goes through a
 453  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 454  *
 455  * An idle winbind client has a read request of 4 bytes outstanding,
 456  * finalizing function is request_len_recv, checking the length. request_recv
 457  * then processes the packet. The processing function then at some point has
 458  * to call request_finished which schedules sending the response.
 459  */
 460
 461 static void request_len_recv(void *private_data, BOOL success);
 462 static void request_recv(void *private_data, BOOL success);
 463 static void request_main_recv(void *private_data, BOOL success);
 464 static void request_finished(struct winbindd_cli_state *state);
 465 void request_finished_cont(void *private_data, BOOL success);
 466 static void response_main_sent(void *private_data, BOOL success);
 467 static void response_extra_sent(void *private_data, BOOL success);
 468
 469 static void response_extra_sent(void *private_data, BOOL success)
 470 {
 471         struct winbindd_cli_state *state =
 472                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 473
 474         if (state->mem_ctx != NULL) {
 475                 talloc_destroy(state->mem_ctx);
 476                 state->mem_ctx = NULL;
 477         }
 478
 479         if (!success) {
 480                 state->finished = True;
 481                 return;
 482         }
 483
 484         SAFE_FREE(state->request.extra_data);
 485         SAFE_FREE(state->response.extra_data);
 486
 487         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 488                          request_len_recv, state);
 489 }
 490
 491 static void response_main_sent(void *private_data, BOOL success)
 492 {
 493         struct winbindd_cli_state *state =
 494                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 495
 496         if (!success) {
 497                 state->finished = True;
 498                 return;
 499         }
 500
 501         if (state->response.length == sizeof(state->response)) {
 502                 if (state->mem_ctx != NULL) {
 503                         talloc_destroy(state->mem_ctx);
 504                         state->mem_ctx = NULL;
 505                 }
 506
 507                 setup_async_read(&state->fd_event, &state->request,
 508                                  sizeof(uint32), request_len_recv, state);
 509                 return;
 510         }
 511
 512         setup_async_write(&state->fd_event, state->response.extra_data,
 513                           state->response.length - sizeof(state->response),
 514                           response_extra_sent, state);
 515 }
 516
 517 static void request_finished(struct winbindd_cli_state *state)
 518 {
 519         setup_async_write(&state->fd_event, &state->response,
 520                           sizeof(state->response), response_main_sent, state);
 521 }
 522
 523 void request_error(struct winbindd_cli_state *state)
 524 {
 525         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 526         state->response.result = WINBINDD_ERROR;
 527         request_finished(state);
 528 }
 529
 530 void request_ok(struct winbindd_cli_state *state)
 531 {
 532         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 533         state->response.result = WINBINDD_OK;
 534         request_finished(state);
 535 }
 536
 537 void request_finished_cont(void *private_data, BOOL success)
 538 {
 539         struct winbindd_cli_state *state =
 540                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 541
 542         if (success)
 543                 request_ok(state);
 544         else
 545                 request_error(state);
 546 }
 547
 548 static void request_len_recv(void *private_data, BOOL success)
 549 {
 550         struct winbindd_cli_state *state =
 551                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 552
 553         if (!success) {
 554                 state->finished = True;
 555                 return;
 556         }
 557
 558         if (*(uint32 *)(&state->request) != sizeof(state->request)) {
 559                 DEBUG(0,("request_len_recv: Invalid request size received: %d\n",
 560                          *(uint32 *)(&state->request)));
 561                 state->finished = True;
 562                 return;
 563         }
 564
 565         setup_async_read(&state->fd_event, (uint32 *)(&state->request)+1,
 566                          sizeof(state->request) - sizeof(uint32),
 567                          request_main_recv, state);
 568 }
 569
 570 static void request_main_recv(void *private_data, BOOL success)
 571 {
 572         struct winbindd_cli_state *state =
 573                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 574
 575         if (!success) {
 576                 state->finished = True;
 577                 return;
 578         }
 579
 580         if (state->request.extra_len == 0) {
 581                 state->request.extra_data = NULL;
 582                 request_recv(state, True);
 583                 return;
 584         }
 585
 586         if ((!state->privileged) &&
 587             (state->request.extra_len > WINBINDD_MAX_EXTRA_DATA)) {
 588                 DEBUG(3, ("Got request with %d bytes extra data on "
 589                           "unprivileged socket\n", state->request.extra_len));
 590                 state->request.extra_data = NULL;
 591                 state->finished = True;
 592                 return;
 593         }
 594
 595         state->request.extra_data =
 596                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
 597
 598         if (state->request.extra_data == NULL) {
 599                 DEBUG(0, ("malloc failed\n"));
 600                 state->finished = True;
 601                 return;
 602         }
 603
 604         /* Ensure null termination */
 605         state->request.extra_data[state->request.extra_len] = '\0';
 606
 607         setup_async_read(&state->fd_event, state->request.extra_data,
 608                          state->request.extra_len, request_recv, state);
 609 }
 610
 611 static void request_recv(void *private_data, BOOL success)
 612 {
 613         struct winbindd_cli_state *state =
 614                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 615
 616         if (!success) {
 617                 state->finished = True;
 618                 return;
 619         }
 620
 621         process_request(state);
 622 }
 623
 624 /* Process a new connection by adding it to the client connection list */
 625
 626 static void new_connection(int listen_sock, BOOL privileged)
 627 {
 628         struct sockaddr_un sunaddr;
 629         struct winbindd_cli_state *state;
 630         socklen_t len;
 631         int sock;
 632
 633         /* Accept connection */
 634
 635         len = sizeof(sunaddr);
 636
 637         do {
 638                 sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
 639         } while (sock == -1 && errno == EINTR);
 640
 641         if (sock == -1)
 642                 return;
 643
 644         DEBUG(6,("accepted socket %d\n", sock));
 645
 646         /* Create new connection structure */
 647
 648         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL)
 649                 return;
 650
 651         state->sock = sock;
 652
 653         state->last_access = time(NULL);
 654
 655         state->privileged = privileged;
 656
 657         state->fd_event.fd = state->sock;
 658         state->fd_event.flags = 0;
 659         add_fd_event(&state->fd_event);
 660
 661         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 662                          request_len_recv, state);
 663
 664         /* Add to connection list */
 665
 666         winbindd_add_client(state);
 667 }
 668
 669 /* Remove a client connection from client connection list */
 670
 671 static void remove_client(struct winbindd_cli_state *state)
 672 {
 673         /* It's a dead client - hold a funeral */
 674
 675         if (state != NULL) {
 676
 677                 /* Close socket */
 678
 679                 close(state->sock);
 680
 681                 /* Free any getent state */
 682
 683                 free_getent_state(state->getpwent_state);
 684                 free_getent_state(state->getgrent_state);
 685
 686                 /* We may have some extra data that was not freed if the
 687                    client was killed unexpectedly */
 688
 689                 SAFE_FREE(state->response.extra_data);
 690
 691                 if (state->mem_ctx != NULL) {
 692                         talloc_destroy(state->mem_ctx);
 693                         state->mem_ctx = NULL;
 694                 }
 695
 696                 remove_fd_event(&state->fd_event);
 697
 698                 /* Remove from list and free */
 699
 700                 winbindd_remove_client(state);
 701                 talloc_free(state);
 702         }
 703 }
 704
 705
 706 /* Shutdown client connection which has been idle for the longest time */
 707
 708 static BOOL remove_idle_client(void)
 709 {
 710         struct winbindd_cli_state *state, *remove_state = NULL;
 711         time_t last_access = 0;
 712         int nidle = 0;
 713
 714         for (state = winbindd_client_list(); state; state = state->next) {
 715                 if (state->read_buf_len == 0 && state->write_buf_len == 0 &&
 716                     state->response.result != WINBINDD_PENDING &&
 717                     !state->getpwent_state && !state->getgrent_state) {
 718                         nidle++;
 719                         if (!last_access || state->last_access < last_access) {
 720                                 last_access = state->last_access;
 721                                 remove_state = state;
 722                         }
 723                 }
 724         }
 725
 726         if (remove_state) {
 727                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 728                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 729                 remove_client(remove_state);
 730                 return True;
 731         }
 732
 733         return False;
 734 }
 735
 736 /* Process a complete received packet from a client */
 737
 738 void winbind_process_packet(struct winbindd_cli_state *state)
 739 {
 740         /* Process request */
 741
 742         /* Ensure null termination of entire request */
 743         state->request.null_term = '\0';
 744
 745         state->pid = state->request.pid;
 746
 747         process_request(state);
 748
 749         /* Update client state */
 750
 751         state->read_buf_len = 0;
 752         state->write_buf_len = sizeof(struct winbindd_response);
 753 }
 754
 755 /* Process incoming clients on listen_sock.  We use a tricky non-blocking,
 756    non-forking, non-threaded model which allows us to handle many
 757    simultaneous connections while remaining impervious to many denial of
 758    service attacks. */
 759
 760 static void process_loop(void)
 761 {
 762         struct winbindd_cli_state *state;
 763         struct fd_event *ev;
 764         fd_set r_fds, w_fds;
 765         int maxfd, listen_sock, listen_priv_sock, selret;
 766         struct timeval timeout;
 767
 768         /* We'll be doing this a lot */
 769
 770         /* Handle messages */
 771
 772         message_dispatch();
 773
 774         /* refresh the trusted domain cache */
 775
 776         rescan_trusted_domains();
 777
 778         /* Free up temporary memory */
 779
 780         lp_talloc_free();
 781         main_loop_talloc_free();
 782
 783         /* Initialise fd lists for select() */
 784
 785         listen_sock = open_winbindd_socket();
 786         listen_priv_sock = open_winbindd_priv_socket();
 787
 788         if (listen_sock == -1 || listen_priv_sock == -1) {
 789                 perror("open_winbind_socket");
 790                 exit(1);
 791         }
 792
 793         maxfd = MAX(listen_sock, listen_priv_sock);
 794
 795         FD_ZERO(&r_fds);
 796         FD_ZERO(&w_fds);
 797         FD_SET(listen_sock, &r_fds);
 798         FD_SET(listen_priv_sock, &r_fds);
 799
 800         timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
 801         timeout.tv_usec = 0;
 802
 803         /* Set up client readers and writers */
 804
 805         state = winbindd_client_list();
 806
 807         while (state) {
 808
 809                 struct winbindd_cli_state *next = state->next;
 810
 811                 /* Dispose of client connection if it is marked as
 812                    finished */
 813
 814                 if (state->finished)
 815                         remove_client(state);
 816
 817                 state = next;
 818         }
 819
 820         for (ev = fd_events; ev; ev = ev->next) {
 821                 if (ev->flags & EVENT_FD_READ) {
 822                         FD_SET(ev->fd, &r_fds);
 823                         maxfd = MAX(ev->fd, maxfd);
 824                 }
 825                 if (ev->flags & EVENT_FD_WRITE) {
 826                         FD_SET(ev->fd, &w_fds);
 827                         maxfd = MAX(ev->fd, maxfd);
 828                 }
 829         }
 830
 831         /* Call select */
 832
 833         selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
 834
 835         if (selret == 0)
 836                 goto no_fds_ready;
 837
 838         if ((selret == -1 && errno != EINTR) || selret == 0) {
 839
 840                 /* Select error, something is badly wrong */
 841
 842                 perror("select");
 843                 exit(1);
 844         }
 845
 846         /* Create a new connection if listen_sock readable */
 847
 848         ev = fd_events;
 849         while (ev != NULL) {
 850                 struct fd_event *next = ev->next;
 851                 int flags = 0;
 852                 if (FD_ISSET(ev->fd, &r_fds))
 853                         flags |= EVENT_FD_READ;
 854                 if (FD_ISSET(ev->fd, &w_fds))
 855                         flags |= EVENT_FD_WRITE;
 856                 if (flags)
 857                         ev->handler(ev, flags);
 858                 ev = next;
 859         }
 860
 861         if (FD_ISSET(listen_sock, &r_fds)) {
 862                 while (winbindd_num_clients() >
 863                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 864                         DEBUG(5,("winbindd: Exceeding %d client "
 865                                  "connections, removing idle "
 866                                  "connection.\n",
 867                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 868                         if (!remove_idle_client()) {
 869                                 DEBUG(0,("winbindd: Exceeding %d "
 870                                          "client connections, no idle "
 871                                          "connection found\n",
 872                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 873                                 break;
 874                         }
 875                 }
 876                 /* new, non-privileged connection */
 877                 new_connection(listen_sock, False);
 878         }
 879
 880         if (FD_ISSET(listen_priv_sock, &r_fds)) {
 881                 while (winbindd_num_clients() >
 882                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 883                         DEBUG(5,("winbindd: Exceeding %d client "
 884                                  "connections, removing idle "
 885                                  "connection.\n",
 886                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 887                         if (!remove_idle_client()) {
 888                                 DEBUG(0,("winbindd: Exceeding %d "
 889                                          "client connections, no idle "
 890                                          "connection found\n",
 891                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 892                                 break;
 893                         }
 894                 }
 895                 /* new, privileged connection */
 896                 new_connection(listen_priv_sock, True);
 897         }
 898
 899  no_fds_ready:
 900
 901 #if 0
 902         winbindd_check_cache_size(time(NULL));
 903 #endif
 904
 905         /* Check signal handling things */
 906
 907         if (do_sigterm)
 908                 terminate();
 909
 910         if (do_sighup) {
 911
 912                 DEBUG(3, ("got SIGHUP\n"));
 913
 914                 msg_reload_services(MSG_SMB_CONF_UPDATED, (pid_t) 0, NULL, 0);
 915                 do_sighup = False;
 916         }
 917
 918         if (do_sigusr2) {
 919                 print_winbindd_status();
 920                 do_sigusr2 = False;
 921         }
 922
 923         if (do_sigchld) {
 924                 pid_t pid;
 925
 926                 do_sigchld = False;
 927
 928                 while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 929                         winbind_child_died(pid);
 930                 }
 931         }
 932 }
 933
 934 /* Main function */
 935
 936 struct winbindd_state server_state;   /* Server state information */
 937
 938 int main(int argc, char **argv)
 939 {
 940         pstring logfile;
 941         static BOOL Fork = True;
 942         static BOOL log_stdout = False;
 943         struct poptOption long_options[] = {
 944                 POPT_AUTOHELP
 945                 { "stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
 946                 { "foreground", 'F', POPT_ARG_VAL, &Fork, False, "Daemon in foreground mode" },
 947                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
 948                 { "no-caching", 'n', POPT_ARG_VAL, &opt_nocache, True, "Disable caching" },
 949                 POPT_COMMON_SAMBA
 950                 POPT_TABLEEND
 951         };
 952         poptContext pc;
 953         int opt;
 954
 955         /* glibc (?) likes to print "User defined signal 1" and exit if a
 956            SIGUSR[12] is received before a handler is installed */
 957
 958         CatchSignal(SIGUSR1, SIG_IGN);
 959         CatchSignal(SIGUSR2, SIG_IGN);
 960
 961         fault_setup((void (*)(void *))fault_quit );
 962
 963         /* Initialise for running in non-root mode */
 964
 965         sec_init();
 966
 967         set_remote_machine_name("winbindd", False);
 968
 969         /* Set environment variable so we don't recursively call ourselves.
 970            This may also be useful interactively. */
 971
 972         setenv(WINBINDD_DONT_ENV, "1", 1);
 973
 974         /* Initialise samba/rpc client stuff */
 975
 976         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options,
 977                                                 POPT_CONTEXT_KEEP_FIRST);
 978
 979         while ((opt = poptGetNextOpt(pc)) != -1) {
 980                 switch (opt) {
 981                         /* Don't become a daemon */
 982                 case 'i':
 983                         interactive = True;
 984                         log_stdout = True;
 985                         Fork = False;
 986                         break;
 987                 }
 988         }
 989
 990
 991         if (log_stdout && Fork) {
 992                 printf("Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n");
 993                 poptPrintUsage(pc, stderr, 0);
 994                 exit(1);
 995         }
 996
 997         if (!override_logfile) {
 998                 pstr_sprintf(logfile, "%s/log.winbindd", dyn_LOGFILEBASE);
 999                 lp_set_logfile(logfile);
1000         }
1001         setup_logging("winbindd", log_stdout);
1002         reopen_logs();
1003
1004         DEBUG(1, ("winbindd version %s started.\n", SAMBA_VERSION_STRING) );
1005         DEBUGADD( 1, ( "Copyright The Samba Team 2000-2004\n" ) );
1006
1007         if (!reload_services_file()) {
1008                 DEBUG(0, ("error opening config file\n"));
1009                 exit(1);
1010         }
1011
1012         /* Setup names. */
1013
1014         if (!init_names())
1015                 exit(1);
1016
1017         load_interfaces();
1018
1019         if (!secrets_init()) {
1020
1021                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1022                 return False;
1023         }
1024
1025         /* Enable netbios namecache */
1026
1027         namecache_enable();
1028
1029         /* Check winbindd parameters are valid */
1030
1031         ZERO_STRUCT(server_state);
1032
1033         /* Winbind daemon initialisation */
1034
1035         if ( (!winbindd_param_init()) || (!winbindd_upgrade_idmap()) ||
1036              (!idmap_init(lp_idmap_backend())) ) {
1037                 DEBUG(1, ("Could not init idmap -- netlogon proxy only\n"));
1038                 idmap_set_proxyonly();
1039         }
1040
1041         /* Unblock all signals we are interested in as they may have been
1042            blocked by the parent process. */
1043
1044         BlockSignals(False, SIGINT);
1045         BlockSignals(False, SIGQUIT);
1046         BlockSignals(False, SIGTERM);
1047         BlockSignals(False, SIGUSR1);
1048         BlockSignals(False, SIGUSR2);
1049         BlockSignals(False, SIGHUP);
1050         BlockSignals(False, SIGCHLD);
1051
1052         /* Setup signal handlers */
1053
1054         CatchSignal(SIGINT, termination_handler);      /* Exit on these sigs */
1055         CatchSignal(SIGQUIT, termination_handler);
1056         CatchSignal(SIGTERM, termination_handler);
1057         CatchSignal(SIGCHLD, sigchld_handler);
1058
1059         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1060
1061         CatchSignal(SIGUSR2, sigusr2_handler);         /* Debugging sigs */
1062         CatchSignal(SIGHUP, sighup_handler);
1063
1064         if (!interactive)
1065                 become_daemon(Fork);
1066
1067         pidfile_create("winbindd");
1068
1069 #if HAVE_SETPGID
1070         /*
1071          * If we're interactive we want to set our own process group for
1072          * signal management.
1073          */
1074         if (interactive)
1075                 setpgid( (pid_t)0, (pid_t)0);
1076 #endif
1077
1078         /* Initialise messaging system */
1079
1080         if (!message_init()) {
1081                 DEBUG(0, ("unable to initialise messaging system\n"));
1082                 exit(1);
1083         }
1084
1085         /* React on 'smbcontrol winbindd reload-config' in the same way
1086            as to SIGHUP signal */
1087         message_register(MSG_SMB_CONF_UPDATED, msg_reload_services);
1088         message_register(MSG_SHUTDOWN, msg_shutdown);
1089
1090         poptFreeContext(pc);
1091
1092         netsamlogon_cache_init(); /* Non-critical */
1093
1094         init_domain_list();
1095
1096         init_idmap_child();
1097
1098         /* Loop waiting for requests */
1099
1100         while (1)
1101                 process_loop();
1102
1103         trustdom_cache_shutdown();
1104
1105         return 0;
1106 }