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\n",
 124                                   (unsigned long)tmp->pid, tmp->sock));
 125                 }
 126         }
 127 }
 128
 129 /* Print winbindd status to log file */
 130
 131 static void print_winbindd_status(void)
 132 {
 133         winbindd_status();
 134 }
 135
 136 /* Flush client cache */
 137
 138 static void flush_caches(void)
 139 {
 140         /* We need to invalidate cached user list entries on a SIGHUP
 141            otherwise cached access denied errors due to restrict anonymous
 142            hang around until the sequence number changes. */
 143
 144         wcache_invalidate_cache();
 145 }
 146
 147 /* Handle the signal by unlinking socket and exiting */
 148
 149 static void terminate(void)
 150 {
 151         pstring path;
 152
 153         idmap_close();
 154
 155         /* Remove socket file */
 156         pstr_sprintf(path, "%s/%s",
 157                  WINBINDD_SOCKET_DIR, WINBINDD_SOCKET_NAME);
 158         unlink(path);
 159
 160 #if 0
 161         if (interactive) {
 162                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 163                 char *description = talloc_describe_all(mem_ctx);
 164
 165                 DEBUG(3, ("tallocs left:\n%s\n", description));
 166                 talloc_destroy(mem_ctx);
 167         }
 168 #endif
 169
 170         exit(0);
 171 }
 172
 173 static BOOL do_sigterm;
 174
 175 static void termination_handler(int signum)
 176 {
 177         do_sigterm = True;
 178         sys_select_signal(signum);
 179 }
 180
 181 static BOOL do_sigusr2;
 182
 183 static void sigusr2_handler(int signum)
 184 {
 185         do_sigusr2 = True;
 186         sys_select_signal(SIGUSR2);
 187 }
 188
 189 static BOOL do_sighup;
 190
 191 static void sighup_handler(int signum)
 192 {
 193         do_sighup = True;
 194         sys_select_signal(SIGHUP);
 195 }
 196
 197 static BOOL do_sigchld;
 198
 199 static void sigchld_handler(int signum)
 200 {
 201         do_sigchld = True;
 202         sys_select_signal(SIGCHLD);
 203 }
 204
 205 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 206 static void msg_reload_services(int msg_type, struct process_id src, void *buf, size_t len)
 207 {
 208         /* Flush various caches */
 209         flush_caches();
 210         reload_services_file();
 211 }
 212
 213 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 214 static void msg_shutdown(int msg_type, struct process_id src, void *buf, size_t len)
 215 {
 216         do_sigterm = True;
 217 }
 218
 219 static struct winbindd_dispatch_table {
 220         enum winbindd_cmd cmd;
 221         void (*fn)(struct winbindd_cli_state *state);
 222         const char *winbindd_cmd_name;
 223 } dispatch_table[] = {
 224
 225         /* User functions */
 226
 227         { WINBINDD_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
 228         { WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },
 229
 230         { WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
 231         { WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
 232         { WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },
 233
 234         { WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },
 235         { WINBINDD_GETUSERSIDS, winbindd_getusersids, "GETUSERSIDS" },
 236         { WINBINDD_GETUSERDOMGROUPS, winbindd_getuserdomgroups,
 237           "GETUSERDOMGROUPS" },
 238
 239         /* Group functions */
 240
 241         { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
 242         { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
 243         { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
 244         { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
 245         { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
 246         { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
 247
 248         /* PAM auth functions */
 249
 250         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 251         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 252         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 253
 254         /* Enumeration functions */
 255
 256         { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
 257         { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
 258         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 259           "LIST_TRUSTDOM" },
 260         { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
 261
 262         /* SID related functions */
 263
 264         { WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
 265         { WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },
 266
 267         /* Lookup related functions */
 268
 269         { WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
 270         { WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
 271         { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
 272         { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
 273         { WINBINDD_ALLOCATE_RID, winbindd_allocate_rid, "ALLOCATE_RID" },
 274         { WINBINDD_ALLOCATE_RID_AND_GID, winbindd_allocate_rid_and_gid,
 275           "ALLOCATE_RID_AND_GID" },
 276
 277         /* Miscellaneous */
 278
 279         { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
 280         { WINBINDD_PING, winbindd_ping, "PING" },
 281         { WINBINDD_INFO, winbindd_info, "INFO" },
 282         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 283           "INTERFACE_VERSION" },
 284         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 285         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 286         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 287         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 288           "WINBINDD_PRIV_PIPE_DIR" },
 289         { WINBINDD_GETDCNAME, winbindd_getdcname, "GETDCNAME" },
 290
 291         /* WINS functions */
 292
 293         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 294         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 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 winbindd_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_PENDING;
 313         state->response.length = sizeof(struct winbindd_response);
 314
 315         state->mem_ctx = talloc_init("winbind request");
 316         if (state->mem_ctx == NULL)
 317                 return;
 318
 319         /* Process command */
 320
 321         for (table = dispatch_table; table->fn; table++) {
 322                 if (state->request.cmd == table->cmd) {
 323                         DEBUG(10,("process_request: request fn %s\n",
 324                                   table->winbindd_cmd_name ));
 325                         table->fn(state);
 326                         break;
 327                 }
 328         }
 329
 330         if (!table->fn) {
 331                 DEBUG(10,("process_request: unknown request fn number %d\n",
 332                           (int)state->request.cmd ));
 333                 request_error(state);
 334         }
 335 }
 336
 337 /*
 338  * A list of file descriptors being monitored by select in the main processing
 339  * loop. fd_event->handler is called whenever the socket is readable/writable.
 340  */
 341
 342 static struct fd_event *fd_events = NULL;
 343
 344 void add_fd_event(struct fd_event *ev)
 345 {
 346         struct fd_event *match;
 347
 348         /* only add unique fd_event structs */
 349
 350         for (match=fd_events; match; match=match->next ) {
 351 #ifdef DEVELOPER
 352                 SMB_ASSERT( match != ev );
 353 #else
 354                 if ( match == ev )
 355                         return;
 356 #endif
 357         }
 358
 359         DLIST_ADD(fd_events, ev);
 360 }
 361
 362 void remove_fd_event(struct fd_event *ev)
 363 {
 364         DLIST_REMOVE(fd_events, ev);
 365 }
 366
 367 /*
 368  * Handler for fd_events to complete a read/write request, set up by
 369  * setup_async_read/setup_async_write.
 370  */
 371
 372 static void rw_callback(struct fd_event *event, int flags)
 373 {
 374         size_t todo;
 375         ssize_t done = 0;
 376
 377         todo = event->length - event->done;
 378
 379         if (event->flags & EVENT_FD_WRITE) {
 380                 SMB_ASSERT(flags == EVENT_FD_WRITE);
 381                 done = sys_write(event->fd,
 382                                  &((char *)event->data)[event->done],
 383                                  todo);
 384
 385                 if (done <= 0) {
 386                         event->flags = 0;
 387                         event->finished(event->private_data, False);
 388                         return;
 389                 }
 390         }
 391
 392         if (event->flags & EVENT_FD_READ) {
 393                 SMB_ASSERT(flags == EVENT_FD_READ);
 394                 done = sys_read(event->fd, &((char *)event->data)[event->done],
 395                                 todo);
 396
 397                 if (done <= 0) {
 398                         event->flags = 0;
 399                         event->finished(event->private_data, False);
 400                         return;
 401                 }
 402         }
 403
 404         event->done += done;
 405
 406         if (event->done == event->length) {
 407                 event->flags = 0;
 408                 event->finished(event->private_data, True);
 409         }
 410 }
 411
 412 /*
 413  * Request an async read/write on a fd_event structure. (*finished) is called
 414  * when the request is completed or an error had occurred.
 415  */
 416
 417 void setup_async_read(struct fd_event *event, void *data, size_t length,
 418                       void (*finished)(void *private_data, BOOL success),
 419                       void *private_data)
 420 {
 421         SMB_ASSERT(event->flags == 0);
 422         event->data = data;
 423         event->length = length;
 424         event->done = 0;
 425         event->handler = rw_callback;
 426         event->finished = finished;
 427         event->private_data = private_data;
 428         event->flags = EVENT_FD_READ;
 429 }
 430
 431 void setup_async_write(struct fd_event *event, void *data, size_t length,
 432                        void (*finished)(void *private_data, BOOL success),
 433                        void *private_data)
 434 {
 435         SMB_ASSERT(event->flags == 0);
 436         event->data = data;
 437         event->length = length;
 438         event->done = 0;
 439         event->handler = rw_callback;
 440         event->finished = finished;
 441         event->private_data = private_data;
 442         event->flags = EVENT_FD_WRITE;
 443 }
 444
 445 /*
 446  * This is the main event loop of winbind requests. It goes through a
 447  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 448  *
 449  * An idle winbind client has a read request of 4 bytes outstanding,
 450  * finalizing function is request_len_recv, checking the length. request_recv
 451  * then processes the packet. The processing function then at some point has
 452  * to call request_finished which schedules sending the response.
 453  */
 454
 455 static void request_len_recv(void *private_data, BOOL success);
 456 static void request_recv(void *private_data, BOOL success);
 457 static void request_main_recv(void *private_data, BOOL success);
 458 static void request_finished(struct winbindd_cli_state *state);
 459 void request_finished_cont(void *private_data, BOOL success);
 460 static void response_main_sent(void *private_data, BOOL success);
 461 static void response_extra_sent(void *private_data, BOOL success);
 462
 463 static void response_extra_sent(void *private_data, BOOL success)
 464 {
 465         struct winbindd_cli_state *state =
 466                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 467
 468         if (state->mem_ctx != NULL) {
 469                 talloc_destroy(state->mem_ctx);
 470                 state->mem_ctx = NULL;
 471         }
 472
 473         if (!success) {
 474                 state->finished = True;
 475                 return;
 476         }
 477
 478         SAFE_FREE(state->request.extra_data);
 479         SAFE_FREE(state->response.extra_data);
 480
 481         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 482                          request_len_recv, state);
 483 }
 484
 485 static void response_main_sent(void *private_data, BOOL success)
 486 {
 487         struct winbindd_cli_state *state =
 488                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 489
 490         if (!success) {
 491                 state->finished = True;
 492                 return;
 493         }
 494
 495         if (state->response.length == sizeof(state->response)) {
 496                 if (state->mem_ctx != NULL) {
 497                         talloc_destroy(state->mem_ctx);
 498                         state->mem_ctx = NULL;
 499                 }
 500
 501                 setup_async_read(&state->fd_event, &state->request,
 502                                  sizeof(uint32), request_len_recv, state);
 503                 return;
 504         }
 505
 506         setup_async_write(&state->fd_event, state->response.extra_data,
 507                           state->response.length - sizeof(state->response),
 508                           response_extra_sent, state);
 509 }
 510
 511 static void request_finished(struct winbindd_cli_state *state)
 512 {
 513         setup_async_write(&state->fd_event, &state->response,
 514                           sizeof(state->response), response_main_sent, state);
 515 }
 516
 517 void request_error(struct winbindd_cli_state *state)
 518 {
 519         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 520         state->response.result = WINBINDD_ERROR;
 521         request_finished(state);
 522 }
 523
 524 void request_ok(struct winbindd_cli_state *state)
 525 {
 526         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 527         state->response.result = WINBINDD_OK;
 528         request_finished(state);
 529 }
 530
 531 void request_finished_cont(void *private_data, BOOL success)
 532 {
 533         struct winbindd_cli_state *state =
 534                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 535
 536         if (success)
 537                 request_ok(state);
 538         else
 539                 request_error(state);
 540 }
 541
 542 static void request_len_recv(void *private_data, BOOL success)
 543 {
 544         struct winbindd_cli_state *state =
 545                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 546
 547         if (!success) {
 548                 state->finished = True;
 549                 return;
 550         }
 551
 552         if (*(uint32 *)(&state->request) != sizeof(state->request)) {
 553                 DEBUG(0,("request_len_recv: Invalid request size received: %d\n",
 554                          *(uint32 *)(&state->request)));
 555                 state->finished = True;
 556                 return;
 557         }
 558
 559         setup_async_read(&state->fd_event, (uint32 *)(&state->request)+1,
 560                          sizeof(state->request) - sizeof(uint32),
 561                          request_main_recv, state);
 562 }
 563
 564 static void request_main_recv(void *private_data, BOOL success)
 565 {
 566         struct winbindd_cli_state *state =
 567                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 568
 569         if (!success) {
 570                 state->finished = True;
 571                 return;
 572         }
 573
 574         if (state->request.extra_len == 0) {
 575                 state->request.extra_data = NULL;
 576                 request_recv(state, True);
 577                 return;
 578         }
 579
 580         if ((!state->privileged) &&
 581             (state->request.extra_len > WINBINDD_MAX_EXTRA_DATA)) {
 582                 DEBUG(3, ("Got request with %d bytes extra data on "
 583                           "unprivileged socket\n", (int)state->request.extra_len));
 584                 state->request.extra_data = NULL;
 585                 state->finished = True;
 586                 return;
 587         }
 588
 589         state->request.extra_data =
 590                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
 591
 592         if (state->request.extra_data == NULL) {
 593                 DEBUG(0, ("malloc failed\n"));
 594                 state->finished = True;
 595                 return;
 596         }
 597
 598         /* Ensure null termination */
 599         state->request.extra_data[state->request.extra_len] = '\0';
 600
 601         setup_async_read(&state->fd_event, state->request.extra_data,
 602                          state->request.extra_len, request_recv, state);
 603 }
 604
 605 static void request_recv(void *private_data, BOOL success)
 606 {
 607         struct winbindd_cli_state *state =
 608                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 609
 610         if (!success) {
 611                 state->finished = True;
 612                 return;
 613         }
 614
 615         process_request(state);
 616 }
 617
 618 /* Process a new connection by adding it to the client connection list */
 619
 620 static void new_connection(int listen_sock, BOOL privileged)
 621 {
 622         struct sockaddr_un sunaddr;
 623         struct winbindd_cli_state *state;
 624         socklen_t len;
 625         int sock;
 626
 627         /* Accept connection */
 628
 629         len = sizeof(sunaddr);
 630
 631         do {
 632                 sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
 633         } while (sock == -1 && errno == EINTR);
 634
 635         if (sock == -1)
 636                 return;
 637
 638         DEBUG(6,("accepted socket %d\n", sock));
 639
 640         /* Create new connection structure */
 641
 642         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL)
 643                 return;
 644
 645         state->sock = sock;
 646
 647         state->last_access = time(NULL);
 648
 649         state->privileged = privileged;
 650
 651         state->fd_event.fd = state->sock;
 652         state->fd_event.flags = 0;
 653         add_fd_event(&state->fd_event);
 654
 655         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 656                          request_len_recv, state);
 657
 658         /* Add to connection list */
 659
 660         winbindd_add_client(state);
 661 }
 662
 663 /* Remove a client connection from client connection list */
 664
 665 static void remove_client(struct winbindd_cli_state *state)
 666 {
 667         /* It's a dead client - hold a funeral */
 668
 669         if (state != NULL) {
 670
 671                 /* Close socket */
 672
 673                 close(state->sock);
 674
 675                 /* Free any getent state */
 676
 677                 free_getent_state(state->getpwent_state);
 678                 free_getent_state(state->getgrent_state);
 679
 680                 /* We may have some extra data that was not freed if the
 681                    client was killed unexpectedly */
 682
 683                 SAFE_FREE(state->response.extra_data);
 684
 685                 if (state->mem_ctx != NULL) {
 686                         talloc_destroy(state->mem_ctx);
 687                         state->mem_ctx = NULL;
 688                 }
 689
 690                 remove_fd_event(&state->fd_event);
 691
 692                 /* Remove from list and free */
 693
 694                 winbindd_remove_client(state);
 695                 talloc_free(state);
 696         }
 697 }
 698
 699
 700 /* Shutdown client connection which has been idle for the longest time */
 701
 702 static BOOL remove_idle_client(void)
 703 {
 704         struct winbindd_cli_state *state, *remove_state = NULL;
 705         time_t last_access = 0;
 706         int nidle = 0;
 707
 708         for (state = winbindd_client_list(); state; state = state->next) {
 709                 if (state->response.result != WINBINDD_PENDING &&
 710                     !state->getpwent_state && !state->getgrent_state) {
 711                         nidle++;
 712                         if (!last_access || state->last_access < last_access) {
 713                                 last_access = state->last_access;
 714                                 remove_state = state;
 715                         }
 716                 }
 717         }
 718
 719         if (remove_state) {
 720                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 721                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 722                 remove_client(remove_state);
 723                 return True;
 724         }
 725
 726         return False;
 727 }
 728
 729 /* Process incoming clients on listen_sock.  We use a tricky non-blocking,
 730    non-forking, non-threaded model which allows us to handle many
 731    simultaneous connections while remaining impervious to many denial of
 732    service attacks. */
 733
 734 static void process_loop(void)
 735 {
 736         struct winbindd_cli_state *state;
 737         struct fd_event *ev;
 738         fd_set r_fds, w_fds;
 739         int maxfd, listen_sock, listen_priv_sock, selret;
 740         struct timeval timeout;
 741
 742         /* We'll be doing this a lot */
 743
 744         /* Handle messages */
 745
 746         message_dispatch();
 747
 748         /* refresh the trusted domain cache */
 749
 750         rescan_trusted_domains();
 751
 752         /* Free up temporary memory */
 753
 754         lp_talloc_free();
 755         main_loop_talloc_free();
 756
 757         /* Initialise fd lists for select() */
 758
 759         listen_sock = open_winbindd_socket();
 760         listen_priv_sock = open_winbindd_priv_socket();
 761
 762         if (listen_sock == -1 || listen_priv_sock == -1) {
 763                 perror("open_winbind_socket");
 764                 exit(1);
 765         }
 766
 767         maxfd = MAX(listen_sock, listen_priv_sock);
 768
 769         FD_ZERO(&r_fds);
 770         FD_ZERO(&w_fds);
 771         FD_SET(listen_sock, &r_fds);
 772         FD_SET(listen_priv_sock, &r_fds);
 773
 774         timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
 775         timeout.tv_usec = 0;
 776
 777         /* Set up client readers and writers */
 778
 779         state = winbindd_client_list();
 780
 781         while (state) {
 782
 783                 struct winbindd_cli_state *next = state->next;
 784
 785                 /* Dispose of client connection if it is marked as
 786                    finished */
 787
 788                 if (state->finished)
 789                         remove_client(state);
 790
 791                 state = next;
 792         }
 793
 794         for (ev = fd_events; ev; ev = ev->next) {
 795                 if (ev->flags & EVENT_FD_READ) {
 796                         FD_SET(ev->fd, &r_fds);
 797                         maxfd = MAX(ev->fd, maxfd);
 798                 }
 799                 if (ev->flags & EVENT_FD_WRITE) {
 800                         FD_SET(ev->fd, &w_fds);
 801                         maxfd = MAX(ev->fd, maxfd);
 802                 }
 803         }
 804
 805         /* Call select */
 806
 807         selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
 808
 809         if (selret == 0)
 810                 goto no_fds_ready;
 811
 812         if ((selret == -1 && errno != EINTR) || selret == 0) {
 813
 814                 /* Select error, something is badly wrong */
 815
 816                 perror("select");
 817                 exit(1);
 818         }
 819
 820         ev = fd_events;
 821         while (ev != NULL) {
 822                 struct fd_event *next = ev->next;
 823                 int flags = 0;
 824                 if (FD_ISSET(ev->fd, &r_fds))
 825                         flags |= EVENT_FD_READ;
 826                 if (FD_ISSET(ev->fd, &w_fds))
 827                         flags |= EVENT_FD_WRITE;
 828                 if (flags)
 829                         ev->handler(ev, flags);
 830                 ev = next;
 831         }
 832
 833         if (FD_ISSET(listen_sock, &r_fds)) {
 834                 while (winbindd_num_clients() >
 835                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 836                         DEBUG(5,("winbindd: Exceeding %d client "
 837                                  "connections, removing idle "
 838                                  "connection.\n",
 839                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 840                         if (!remove_idle_client()) {
 841                                 DEBUG(0,("winbindd: Exceeding %d "
 842                                          "client connections, no idle "
 843                                          "connection found\n",
 844                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 845                                 break;
 846                         }
 847                 }
 848                 /* new, non-privileged connection */
 849                 new_connection(listen_sock, False);
 850         }
 851
 852         if (FD_ISSET(listen_priv_sock, &r_fds)) {
 853                 while (winbindd_num_clients() >
 854                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 855                         DEBUG(5,("winbindd: Exceeding %d client "
 856                                  "connections, removing idle "
 857                                  "connection.\n",
 858                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 859                         if (!remove_idle_client()) {
 860                                 DEBUG(0,("winbindd: Exceeding %d "
 861                                          "client connections, no idle "
 862                                          "connection found\n",
 863                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 864                                 break;
 865                         }
 866                 }
 867                 /* new, privileged connection */
 868                 new_connection(listen_priv_sock, True);
 869         }
 870
 871  no_fds_ready:
 872
 873 #if 0
 874         winbindd_check_cache_size(time(NULL));
 875 #endif
 876
 877         /* Check signal handling things */
 878
 879         if (do_sigterm)
 880                 terminate();
 881
 882         if (do_sighup) {
 883
 884                 DEBUG(3, ("got SIGHUP\n"));
 885
 886                 msg_reload_services(MSG_SMB_CONF_UPDATED, pid_to_procid(0), NULL, 0);
 887                 do_sighup = False;
 888         }
 889
 890         if (do_sigusr2) {
 891                 print_winbindd_status();
 892                 do_sigusr2 = False;
 893         }
 894
 895         if (do_sigchld) {
 896                 pid_t pid;
 897
 898                 do_sigchld = False;
 899
 900                 while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 901                         winbind_child_died(pid);
 902                 }
 903         }
 904 }
 905
 906 /* Main function */
 907
 908 struct winbindd_state server_state;   /* Server state information */
 909
 910 int main(int argc, char **argv)
 911 {
 912         pstring logfile;
 913         static BOOL Fork = True;
 914         static BOOL log_stdout = False;
 915         struct poptOption long_options[] = {
 916                 POPT_AUTOHELP
 917                 { "stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
 918                 { "foreground", 'F', POPT_ARG_VAL, &Fork, False, "Daemon in foreground mode" },
 919                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
 920                 { "no-caching", 'n', POPT_ARG_VAL, &opt_nocache, True, "Disable caching" },
 921                 POPT_COMMON_SAMBA
 922                 POPT_TABLEEND
 923         };
 924         poptContext pc;
 925         int opt;
 926
 927         /* glibc (?) likes to print "User defined signal 1" and exit if a
 928            SIGUSR[12] is received before a handler is installed */
 929
 930         CatchSignal(SIGUSR1, SIG_IGN);
 931         CatchSignal(SIGUSR2, SIG_IGN);
 932
 933         fault_setup((void (*)(void *))fault_quit );
 934
 935         /* Initialise for running in non-root mode */
 936
 937         sec_init();
 938
 939         set_remote_machine_name("winbindd", False);
 940
 941         /* Set environment variable so we don't recursively call ourselves.
 942            This may also be useful interactively. */
 943
 944         setenv(WINBINDD_DONT_ENV, "1", 1);
 945
 946         /* Initialise samba/rpc client stuff */
 947
 948         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options,
 949                                                 POPT_CONTEXT_KEEP_FIRST);
 950
 951         while ((opt = poptGetNextOpt(pc)) != -1) {
 952                 switch (opt) {
 953                         /* Don't become a daemon */
 954                 case 'i':
 955                         interactive = True;
 956                         log_stdout = True;
 957                         Fork = False;
 958                         break;
 959                 }
 960         }
 961
 962
 963         if (log_stdout && Fork) {
 964                 printf("Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n");
 965                 poptPrintUsage(pc, stderr, 0);
 966                 exit(1);
 967         }
 968
 969         if (!override_logfile) {
 970                 pstr_sprintf(logfile, "%s/log.winbindd", dyn_LOGFILEBASE);
 971                 lp_set_logfile(logfile);
 972         }
 973         setup_logging("winbindd", log_stdout);
 974         reopen_logs();
 975
 976         DEBUG(1, ("winbindd version %s started.\n", SAMBA_VERSION_STRING) );
 977         DEBUGADD( 1, ( "Copyright The Samba Team 2000-2004\n" ) );
 978
 979         if (!reload_services_file()) {
 980                 DEBUG(0, ("error opening config file\n"));
 981                 exit(1);
 982         }
 983
 984         /* Setup names. */
 985
 986         if (!init_names())
 987                 exit(1);
 988
 989         load_interfaces();
 990
 991         if (!secrets_init()) {
 992
 993                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
 994                 return False;
 995         }
 996
 997         /* Enable netbios namecache */
 998
 999         namecache_enable();
1000
1001         /* Check winbindd parameters are valid */
1002
1003         ZERO_STRUCT(server_state);
1004
1005         /* Winbind daemon initialisation */
1006
1007         if ( (!winbindd_param_init()) || (!winbindd_upgrade_idmap()) ||
1008              (!idmap_init(lp_idmap_backend())) ) {
1009                 DEBUG(1, ("Could not init idmap -- netlogon proxy only\n"));
1010                 idmap_set_proxyonly();
1011         }
1012
1013         /* Unblock all signals we are interested in as they may have been
1014            blocked by the parent process. */
1015
1016         BlockSignals(False, SIGINT);
1017         BlockSignals(False, SIGQUIT);
1018         BlockSignals(False, SIGTERM);
1019         BlockSignals(False, SIGUSR1);
1020         BlockSignals(False, SIGUSR2);
1021         BlockSignals(False, SIGHUP);
1022         BlockSignals(False, SIGCHLD);
1023
1024         /* Setup signal handlers */
1025
1026         CatchSignal(SIGINT, termination_handler);      /* Exit on these sigs */
1027         CatchSignal(SIGQUIT, termination_handler);
1028         CatchSignal(SIGTERM, termination_handler);
1029         CatchSignal(SIGCHLD, sigchld_handler);
1030
1031         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1032
1033         CatchSignal(SIGUSR2, sigusr2_handler);         /* Debugging sigs */
1034         CatchSignal(SIGHUP, sighup_handler);
1035
1036         if (!interactive)
1037                 become_daemon(Fork);
1038
1039         pidfile_create("winbindd");
1040
1041 #if HAVE_SETPGID
1042         /*
1043          * If we're interactive we want to set our own process group for
1044          * signal management.
1045          */
1046         if (interactive)
1047                 setpgid( (pid_t)0, (pid_t)0);
1048 #endif
1049
1050         TimeInit();
1051
1052         /* Initialise messaging system */
1053
1054         if (!message_init()) {
1055                 DEBUG(0, ("unable to initialise messaging system\n"));
1056                 exit(1);
1057         }
1058
1059         /* React on 'smbcontrol winbindd reload-config' in the same way
1060            as to SIGHUP signal */
1061         message_register(MSG_SMB_CONF_UPDATED, msg_reload_services);
1062         message_register(MSG_SHUTDOWN, msg_shutdown);
1063
1064         poptFreeContext(pc);
1065
1066         netsamlogon_cache_init(); /* Non-critical */
1067
1068         init_domain_list();
1069
1070         init_idmap_child();
1071
1072         /* Loop waiting for requests */
1073
1074         while (1)
1075                 process_loop();
1076
1077         trustdom_cache_shutdown();
1078
1079         return 0;
1080 }