source3/wrepld/server.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Main SMB server routines
   4    Copyright (C) Jean François Micouleau      1998-2002.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22 #include "wins_repl.h"
  23
  24 extern pstring user_socket_options;
  25
  26 extern WINS_OWNER *global_wins_table;
  27 extern int partner_count;
  28
  29 extern fd_set *listen_set;
  30 extern int listen_number;
  31 extern int *sock_array;
  32
  33 extern TALLOC_CTX *mem_ctx;
  34
  35 int wins_port = 42;
  36
  37 /****************************************************************************
  38   when exiting, take the whole family
  39 ****************************************************************************/
  40 static void *dflt_sig(void)
  41 {
  42         exit_server("caught signal");
  43         return NULL;
  44 }
  45
  46 /****************************************************************************
  47   reload the services file
  48   **************************************************************************/
  49 BOOL reload_services(BOOL test)
  50 {
  51         BOOL ret;
  52
  53         if (lp_loaded()) {
  54                 pstring fname;
  55                 pstrcpy(fname,lp_configfile());
  56                 if (file_exist(fname,NULL) && !strcsequal(fname,dyn_CONFIGFILE)) {
  57                         pstrcpy(dyn_CONFIGFILE,fname);
  58                         test = False;
  59                 }
  60         }
  61
  62         reopen_logs();
  63
  64         if (test && !lp_file_list_changed())
  65                 return(True);
  66
  67         ret = lp_load(dyn_CONFIGFILE,False,False,True);
  68
  69
  70         /* perhaps the config filename is now set */
  71         if (!test)
  72                 reload_services(True);
  73
  74         reopen_logs();
  75
  76         load_interfaces();
  77
  78         return(ret);
  79 }
  80
  81 /****************************************************************************
  82  Catch a sighup.
  83 ****************************************************************************/
  84
  85 VOLATILE sig_atomic_t reload_after_sighup = False;
  86
  87 static void sig_hup(int sig)
  88 {
  89         BlockSignals(True,SIGHUP);
  90         DEBUG(0,("Got SIGHUP\n"));
  91
  92         sys_select_signal();
  93         reload_after_sighup = True;
  94         BlockSignals(False,SIGHUP);
  95 }
  96
  97 #if DUMP_CORE
  98 /*******************************************************************
  99 prepare to dump a core file - carefully!
 100 ********************************************************************/
 101 static BOOL dump_core(void)
 102 {
 103         char *p;
 104         pstring dname;
 105         pstrcpy(dname,lp_logfile());
 106         if ((p=strrchr_m(dname,'/'))) *p=0;
 107         pstrcat(dname,"/corefiles");
 108         mkdir(dname,0700);
 109         sys_chown(dname,getuid(),getgid());
 110         chmod(dname,0700);
 111         if (chdir(dname)) return(False);
 112         umask(~(0700));
 113
 114 #ifdef HAVE_GETRLIMIT
 115 #ifdef RLIMIT_CORE
 116         {
 117                 struct rlimit rlp;
 118                 getrlimit(RLIMIT_CORE, &rlp);
 119                 rlp.rlim_cur = MAX(4*1024*1024,rlp.rlim_cur);
 120                 setrlimit(RLIMIT_CORE, &rlp);
 121                 getrlimit(RLIMIT_CORE, &rlp);
 122                 DEBUG(3,("Core limits now %d %d\n",
 123                          (int)rlp.rlim_cur,(int)rlp.rlim_max));
 124         }
 125 #endif
 126 #endif
 127
 128
 129         DEBUG(0,("Dumping core in %s\n",dname));
 130         abort();
 131         return(True);
 132 }
 133 #endif
 134
 135 /****************************************************************************
 136 exit the server
 137 ****************************************************************************/
 138 void exit_server(const char *reason)
 139 {
 140         static int firsttime=1;
 141
 142         if (!firsttime)
 143                 exit(0);
 144         firsttime = 0;
 145
 146         DEBUG(2,("Closing connections\n"));
 147
 148         if (!reason) {
 149                 int oldlevel = DEBUGLEVEL;
 150                 DEBUGLEVEL = 10;
 151                 DEBUGLEVEL = oldlevel;
 152                 DEBUG(0,("===============================================================\n"));
 153 #if DUMP_CORE
 154                 if (dump_core()) return;
 155 #endif
 156         }
 157
 158         DEBUG(3,("Server exit (%s)\n", (reason ? reason : "")));
 159         exit(0);
 160 }
 161
 162 /****************************************************************************
 163   Create an fd_set containing all the sockets in the subnet structures,
 164   plus the broadcast sockets.
 165 ***************************************************************************/
 166
 167 static BOOL create_listen_fdset(void)
 168 {
 169         int i;
 170         int num_interfaces = iface_count();
 171         int s;
 172
 173         listen_set = (fd_set *)malloc(sizeof(fd_set));
 174         if(listen_set == NULL) {
 175                 DEBUG(0,("create_listen_fdset: malloc fail !\n"));
 176                 return True;
 177         }
 178
 179 #ifdef HAVE_ATEXIT
 180         {
 181                 static int atexit_set;
 182                 if(atexit_set == 0) {
 183                         atexit_set=1;
 184                 }
 185         }
 186 #endif
 187
 188         FD_ZERO(listen_set);
 189
 190         if(lp_interfaces() && lp_bind_interfaces_only()) {
 191                 /* We have been given an interfaces line, and been
 192                    told to only bind to those interfaces. Create a
 193                    socket per interface and bind to only these.
 194                 */
 195
 196                 if(num_interfaces > FD_SETSIZE) {
 197                         DEBUG(0,("create_listen_fdset: Too many interfaces specified to bind to. Number was %d max can be %d\n", num_interfaces, FD_SETSIZE));
 198                         return False;
 199                 }
 200
 201                 /* Now open a listen socket for each of the interfaces. */
 202                 for(i = 0; i < num_interfaces; i++) {
 203                         struct in_addr *ifip = iface_n_ip(i);
 204
 205                         if(ifip == NULL) {
 206                                 DEBUG(0,("create_listen_fdset: interface %d has NULL IP address !\n", i));
 207                                 continue;
 208                         }
 209                         s = open_socket_in(SOCK_STREAM, wins_port, 0, ifip->s_addr, True);
 210                         if(s == -1)
 211                                 return False;
 212
 213                         /* ready to listen */
 214                         set_socket_options(s,"SO_KEEPALIVE");
 215                         set_socket_options(s,user_socket_options);
 216
 217                         if (listen(s, 5) == -1) {
 218                                 DEBUG(5,("listen: %s\n",strerror(errno)));
 219                                 close(s);
 220                                 return False;
 221                         }
 222                         add_fd_to_sock_array(s);
 223                         FD_SET(s, listen_set);
 224                 }
 225         } else {
 226                 /* Just bind to 0.0.0.0 - accept connections from anywhere. */
 227                 num_interfaces = 1;
 228
 229                 /* open an incoming socket */
 230                 s = open_socket_in(SOCK_STREAM, wins_port, 0, interpret_addr(lp_socket_address()),True);
 231                 if (s == -1)
 232                         return(False);
 233
 234                 /* ready to listen */
 235                 set_socket_options(s,"SO_KEEPALIVE");
 236                 set_socket_options(s,user_socket_options);
 237
 238                 if (listen(s, 5) == -1) {
 239                         DEBUG(0,("create_listen_fdset: listen: %s\n", strerror(errno)));
 240                         close(s);
 241                         return False;
 242                 }
 243
 244                 add_fd_to_sock_array(s);
 245                 FD_SET(s, listen_set);
 246         }
 247
 248         return True;
 249 }
 250
 251 /*******************************************************************
 252   read a packet from a socket and parse it, returning a packet ready
 253   to be used or put on the queue. This assumes a UDP socket
 254   ******************************************************************/
 255 static struct wins_packet_struct *read_wins_packet(int fd, int timeout)
 256 {
 257         struct wins_packet_struct *p;
 258         GENERIC_PACKET *q;
 259         struct BUFFER inbuf;
 260         ssize_t len=0;
 261         size_t total=0;
 262         ssize_t ret;
 263         BOOL ok = False;
 264
 265         inbuf.buffer=NULL;
 266         inbuf.length=0;
 267         inbuf.offset=0;
 268
 269         if(!grow_buffer(&inbuf, 4))
 270                 return NULL;
 271
 272         ok = (read(fd, inbuf.buffer,4) == 4);
 273         if (!ok)
 274                 return NULL;
 275         len = smb_len(inbuf.buffer);
 276
 277         if (len<=0)
 278                 return NULL;
 279
 280         if(!grow_buffer(&inbuf, len))
 281                 return NULL;
 282
 283         while (total < len) {
 284                 ret = read(fd, inbuf.buffer + total + 4, len - total);
 285                 if (ret == 0) {
 286                         DEBUG(10,("read_socket_data: recv of %d returned 0. Error = %s\n", (int)(len - total), strerror(errno) ));
 287                         return NULL;
 288                 }
 289                 if (ret == -1) {
 290                         DEBUG(0,("read_socket_data: recv failure for %d. Error = %s\n", (int)(len - total), strerror(errno) ));
 291                         return NULL;
 292                 }
 293                 total += ret;
 294         }
 295
 296         q = (GENERIC_PACKET *)talloc(mem_ctx, sizeof(GENERIC_PACKET));
 297         p = (struct wins_packet_struct *)talloc(mem_ctx, sizeof(*p));
 298         if (q==NULL || p==NULL)
 299                 return NULL;
 300
 301         decode_generic_packet(&inbuf, q);
 302
 303         q->fd=fd;
 304
 305         p->next = NULL;
 306         p->prev = NULL;
 307         p->stop_packet = False;
 308         p->timestamp = time(NULL);
 309         p->fd = fd;
 310         p->packet=q;
 311
 312         return p;
 313 }
 314
 315 static struct wins_packet_struct *packet_queue = NULL;
 316
 317 /*******************************************************************
 318   Queue a packet into a packet queue
 319 ******************************************************************/
 320 static void queue_packet(struct wins_packet_struct *packet)
 321 {
 322         struct wins_packet_struct *p;
 323
 324         if (!packet_queue) {
 325                 packet->prev = NULL;
 326                 packet->next = NULL;
 327                 packet_queue = packet;
 328                 return;
 329         }
 330
 331         /* find the bottom */
 332         for (p=packet_queue;p->next;p=p->next)
 333                 ;
 334
 335         p->next = packet;
 336         packet->next = NULL;
 337         packet->prev = p;
 338 }
 339
 340 /****************************************************************************
 341   Listens for NMB or DGRAM packets, and queues them.
 342   return True if the socket is dead
 343 ***************************************************************************/
 344 static BOOL listen_for_wins_packets(void)
 345 {
 346         int num_interfaces = iface_count();
 347         fd_set fds;
 348         int i, num, s, new_s;
 349         struct timeval timeout;
 350
 351         if(listen_set == NULL) {
 352                 if(!create_listen_fdset()) {
 353                         DEBUG(0,("listen_for_packets: Fatal error. unable to create listen set. Exiting.\n"));
 354                         return True;
 355                 }
 356         }
 357
 358         memcpy((char *)&fds, (char *)listen_set, sizeof(fd_set));
 359
 360         timeout.tv_sec = NMBD_SELECT_LOOP;
 361         timeout.tv_usec = 0;
 362
 363         /* Prepare for the select - allow certain signals. */
 364
 365         BlockSignals(False, SIGTERM);
 366
 367         num = sys_select(FD_SETSIZE, &fds, NULL, NULL, &timeout);
 368
 369         /* We can only take signals when we are in the select - block them again here. */
 370
 371         BlockSignals(True, SIGTERM);
 372
 373         if(num == -1)
 374                 return False;
 375
 376         for (; num > 0; num--) {
 377                 s = -1;
 378                 /* check the sockets we are only listening on, waiting to accept */
 379                 for (i=0; i<num_interfaces; i++) {
 380                         struct sockaddr addr;
 381                         socklen_t in_addrlen = sizeof(addr);
 382
 383                         if(FD_ISSET(sock_array[i], &fds)) {
 384                                 s = sock_array[i];
 385                                 /* Clear this so we don't look at it again. */
 386                                 FD_CLR(sock_array[i], &fds);
 387
 388                                 /* accept and add the new socket to the listen set */
 389                                 new_s=accept(s, &addr, &in_addrlen);
 390
 391                                 if (new_s < 0)
 392                                         continue;
 393
 394                                 DEBUG(5,("listen_for_wins_packets: new connection, old: %d, new : %d\n", s, new_s));
 395
 396                                 set_socket_options(new_s, "SO_KEEPALIVE");
 397                                 set_socket_options(new_s, user_socket_options);
 398                                 FD_SET(new_s, listen_set);
 399                                 add_fd_to_sock_array(new_s);
 400                         }
 401                 }
 402
 403                 /*
 404                  * check for the sockets we are waiting data from
 405                  * either client sending datas
 406                  * or reply to our requests
 407                  */
 408                 for (i=num_interfaces; i<listen_number; i++) {
 409                         if(FD_ISSET(sock_array[i], &fds)) {
 410                                 struct wins_packet_struct *packet = read_wins_packet(sock_array[i], timeout.tv_sec);
 411                                 if (packet) {
 412                                         packet->fd = sock_array[i];
 413                                         queue_packet(packet);
 414                                 }
 415                                 DEBUG(2,("listen_for_wins_packets: some data on fd %d\n", sock_array[i]));
 416                                 FD_CLR(sock_array[i], &fds);
 417                                 break;
 418                         }
 419
 420                 }
 421
 422         }
 423
 424         return False;
 425 }
 426
 427
 428 /*******************************************************************
 429   Run elements off the packet queue till its empty
 430 ******************************************************************/
 431
 432 static void run_wins_packet_queue(void)
 433 {
 434         struct wins_packet_struct *p;
 435
 436         while ((p = packet_queue)) {
 437                 packet_queue = p->next;
 438                 if (packet_queue)
 439                         packet_queue->prev = NULL;
 440                 p->next = p->prev = NULL;
 441
 442                 construct_reply(p);
 443
 444                 /* if it was a stop assoc, close the connection */
 445                 if (p->stop_packet) {
 446                         FD_CLR(p->fd, listen_set);
 447                         remove_fd_from_sock_array(p->fd);
 448                         close(p->fd);
 449                 }
 450         }
 451 }
 452
 453 /**************************************************************************** **
 454  The main select loop.
 455  **************************************************************************** */
 456 static void process(void)
 457 {
 458
 459         while( True ) {
 460                 time_t t = time(NULL);
 461
 462                 /* check for internal messages */
 463                 message_dispatch();
 464
 465                 if(listen_for_wins_packets())
 466                         return;
 467
 468                 run_wins_packet_queue();
 469
 470                 run_pull_replication(t);
 471
 472                 run_push_replication(t);
 473
 474                 /*
 475                  * Reload the services file if we got a sighup.
 476                  */
 477
 478                 if(reload_after_sighup) {
 479                         reload_services( True );
 480                         reopen_logs();
 481                         reload_after_sighup = False;
 482                 }
 483
 484                 /* free temp memory */
 485                 talloc_destroy_pool(mem_ctx);
 486
 487                 /* free up temp memory */
 488                 lp_talloc_free();
 489         }
 490 } /* process */
 491
 492 /****************************************************************************
 493   main program
 494 ****************************************************************************/
 495  int main(int argc,char *argv[])
 496 {
 497         /* shall I run as a daemon */
 498         static BOOL is_daemon = False;
 499         static BOOL interactive = False;
 500         static BOOL Fork = True;
 501         static BOOL log_stdout = False;
 502         struct poptOption long_options[] = {
 503                 POPT_AUTOHELP
 504                 { "daemon", 'D', POPT_ARG_VAL, &is_daemon, True, "Become a daemon (default)" },
 505                 { "foreground", 'F', POPT_ARG_VAL, &Fork, False, "Run daemon in foreground (for daemontools, etc)" },
 506                 { "stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
 507                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Run interactive (not a daemon)" },
 508                 { "port", 'p', POPT_ARG_INT, &wins_port, 'p', "Listen on the specified port" },
 509                 POPT_COMMON_SAMBA
 510                 POPT_TABLEEND
 511         };
 512         int opt;
 513         poptContext pc;
 514
 515 #ifdef HAVE_SET_AUTH_PARAMETERS
 516         set_auth_parameters(argc,argv);
 517 #endif
 518
 519         pc = poptGetContext("wrepld", argc, (const char **)argv, long_options,
 520                                                 POPT_CONTEXT_KEEP_FIRST);
 521
 522         while ((opt = poptGetNextOpt(pc)) != -1) {
 523                 switch (opt)  {
 524                 case 'i':
 525                         interactive = True;
 526                         Fork = False;
 527                         log_stdout = True;
 528                         break;
 529                 }
 530         }
 531
 532
 533         if (log_stdout && Fork) {
 534                 d_printf("Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n");
 535                 poptPrintUsage(pc, stderr, 0);
 536                 exit(1);
 537         }
 538
 539 #ifdef HAVE_SETLUID
 540         /* needed for SecureWare on SCO */
 541         setluid(0);
 542 #endif
 543
 544         sec_init();
 545
 546         load_case_tables();
 547
 548         set_remote_machine_name("wrepld", False);
 549
 550         setup_logging(argv[0],log_stdout);
 551
 552         /* we want to re-seed early to prevent time delays causing
 553            client problems at a later date. (tridge) */
 554         generate_random_buffer(NULL, 0, False);
 555
 556         /* make absolutely sure we run as root - to handle cases where people
 557            are crazy enough to have it setuid */
 558
 559         gain_root_privilege();
 560         gain_root_group_privilege();
 561
 562         fault_setup((void (*)(void *))exit_server);
 563         CatchSignal(SIGTERM , SIGNAL_CAST dflt_sig);
 564
 565         /* we are never interested in SIGPIPE */
 566         BlockSignals(True,SIGPIPE);
 567
 568 #if defined(SIGFPE)
 569         /* we are never interested in SIGFPE */
 570         BlockSignals(True,SIGFPE);
 571 #endif
 572
 573 #if defined(SIGUSR2)
 574         /* We are no longer interested in USR2 */
 575         BlockSignals(True,SIGUSR2);
 576 #endif
 577
 578         /* POSIX demands that signals are inherited. If the invoking process has
 579          * these signals masked, we will have problems, as we won't recieve them. */
 580         BlockSignals(False, SIGHUP);
 581         BlockSignals(False, SIGUSR1);
 582
 583         /* we want total control over the permissions on created files,
 584            so set our umask to 0 */
 585         umask(0);
 586
 587         reopen_logs();
 588
 589         DEBUG(1,( "wrepld version %s started.\n", SAMBA_VERSION_STRING));
 590         DEBUGADD(1,( "Copyright Andrew Tridgell and the Samba Team 1992-2002\n"));
 591
 592         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
 593                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
 594
 595         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
 596                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
 597                 exit(1);
 598         }
 599
 600         /*
 601          * Do this before reload_services.
 602          */
 603
 604         if (!reload_services(False))
 605                 return(-1);
 606
 607         if (!init_names())
 608                 return -1;
 609
 610 #ifdef WITH_PROFILE
 611         if (!profile_setup(False)) {
 612                 DEBUG(0,("ERROR: failed to setup profiling\n"));
 613                 return -1;
 614         }
 615 #endif
 616
 617         CatchSignal(SIGHUP,SIGNAL_CAST sig_hup);
 618
 619         DEBUG(3,( "loaded services\n"));
 620
 621         if (!is_daemon && !is_a_socket(0)) {
 622                 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
 623                 is_daemon = True;
 624         }
 625
 626         if (is_daemon && !interactive) {
 627                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
 628                 become_daemon(Fork);
 629         }
 630
 631 #if HAVE_SETPGID
 632         /*
 633          * If we're interactive we want to set our own process group for
 634          * signal management.
 635          */
 636         if (interactive)
 637                 setpgid( (pid_t)0, (pid_t)0);
 638 #endif
 639
 640         if (!directory_exist(lp_lockdir(), NULL)) {
 641                 mkdir(lp_lockdir(), 0755);
 642         }
 643
 644         if (is_daemon) {
 645                 pidfile_create("wrepld");
 646         }
 647
 648         if (!message_init()) {
 649                 exit(1);
 650         }
 651
 652         /* Initialise the memory context */
 653         mem_ctx=talloc_init("wins repl talloc ctx");
 654
 655         /* initialise the global partners table */
 656         partner_count=init_wins_partner_table();
 657
 658         /* We can only take signals in the select. */
 659         BlockSignals( True, SIGTERM );
 660
 661         process();
 662
 663         poptFreeContext(pc);
 664         exit_server("normal exit");
 665         return(0);
 666 }