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  Usage of the program.
 164 ****************************************************************************/
 165
 166 static void usage(char *pname)
 167 {
 168
 169 }
 170
 171 /****************************************************************************
 172   Create an fd_set containing all the sockets in the subnet structures,
 173   plus the broadcast sockets.
 174 ***************************************************************************/
 175
 176 static BOOL create_listen_fdset(void)
 177 {
 178         int i;
 179         int num_interfaces = iface_count();
 180         int s;
 181
 182         listen_set = (fd_set *)malloc(sizeof(fd_set));
 183         if(listen_set == NULL) {
 184                 DEBUG(0,("create_listen_fdset: malloc fail !\n"));
 185                 return True;
 186         }
 187
 188 #ifdef HAVE_ATEXIT
 189         {
 190                 static int atexit_set;
 191                 if(atexit_set == 0) {
 192                         atexit_set=1;
 193                 }
 194         }
 195 #endif
 196
 197         FD_ZERO(listen_set);
 198
 199         if(lp_interfaces() && lp_bind_interfaces_only()) {
 200                 /* We have been given an interfaces line, and been
 201                    told to only bind to those interfaces. Create a
 202                    socket per interface and bind to only these.
 203                 */
 204
 205                 if(num_interfaces > FD_SETSIZE) {
 206                         DEBUG(0,("create_listen_fdset: Too many interfaces specified to bind to. Number was %d max can be %d\n", num_interfaces, FD_SETSIZE));
 207                         return False;
 208                 }
 209
 210                 /* Now open a listen socket for each of the interfaces. */
 211                 for(i = 0; i < num_interfaces; i++) {
 212                         struct in_addr *ifip = iface_n_ip(i);
 213
 214                         if(ifip == NULL) {
 215                                 DEBUG(0,("create_listen_fdset: interface %d has NULL IP address !\n", i));
 216                                 continue;
 217                         }
 218                         s = open_socket_in(SOCK_STREAM, wins_port, 0, ifip->s_addr, True);
 219                         if(s == -1)
 220                                 return False;
 221
 222                         /* ready to listen */
 223                         set_socket_options(s,"SO_KEEPALIVE");
 224                         set_socket_options(s,user_socket_options);
 225
 226                         if (listen(s, 5) == -1) {
 227                                 DEBUG(5,("listen: %s\n",strerror(errno)));
 228                                 close(s);
 229                                 return False;
 230                         }
 231                         add_fd_to_sock_array(s);
 232                         FD_SET(s, listen_set);
 233                 }
 234         } else {
 235                 /* Just bind to 0.0.0.0 - accept connections from anywhere. */
 236                 num_interfaces = 1;
 237
 238                 /* open an incoming socket */
 239                 s = open_socket_in(SOCK_STREAM, wins_port, 0, interpret_addr(lp_socket_address()),True);
 240                 if (s == -1)
 241                         return(False);
 242
 243                 /* ready to listen */
 244                 set_socket_options(s,"SO_KEEPALIVE");
 245                 set_socket_options(s,user_socket_options);
 246
 247                 if (listen(s, 5) == -1) {
 248                         DEBUG(0,("create_listen_fdset: listen: %s\n", strerror(errno)));
 249                         close(s);
 250                         return False;
 251                 }
 252
 253                 add_fd_to_sock_array(s);
 254                 FD_SET(s, listen_set);
 255         }
 256
 257         return True;
 258 }
 259
 260 /*******************************************************************
 261   read a packet from a socket and parse it, returning a packet ready
 262   to be used or put on the queue. This assumes a UDP socket
 263   ******************************************************************/
 264 static struct wins_packet_struct *read_wins_packet(int fd, int timeout)
 265 {
 266         struct wins_packet_struct *p;
 267         GENERIC_PACKET *q;
 268         struct BUFFER inbuf;
 269         ssize_t len=0;
 270         size_t total=0;
 271         ssize_t ret;
 272         BOOL ok = False;
 273
 274         inbuf.buffer=NULL;
 275         inbuf.length=0;
 276         inbuf.offset=0;
 277
 278         if(!grow_buffer(&inbuf, 4))
 279                 return NULL;
 280
 281         ok = (read(fd, inbuf.buffer,4) == 4);
 282         if (!ok)
 283                 return NULL;
 284         len = smb_len(inbuf.buffer);
 285
 286         if (len<=0)
 287                 return NULL;
 288
 289         if(!grow_buffer(&inbuf, len))
 290                 return NULL;
 291
 292         while (total < len) {
 293                 ret = read(fd, inbuf.buffer + total + 4, len - total);
 294                 if (ret == 0) {
 295                         DEBUG(10,("read_socket_data: recv of %d returned 0. Error = %s\n", (int)(len - total), strerror(errno) ));
 296                         return NULL;
 297                 }
 298                 if (ret == -1) {
 299                         DEBUG(0,("read_socket_data: recv failure for %d. Error = %s\n", (int)(len - total), strerror(errno) ));
 300                         return NULL;
 301                 }
 302                 total += ret;
 303         }
 304
 305         q = (GENERIC_PACKET *)talloc(mem_ctx, sizeof(GENERIC_PACKET));
 306         p = (struct wins_packet_struct *)talloc(mem_ctx, sizeof(*p));
 307         if (q==NULL || p==NULL)
 308                 return NULL;
 309
 310         decode_generic_packet(&inbuf, q);
 311
 312         q->fd=fd;
 313
 314         p->next = NULL;
 315         p->prev = NULL;
 316         p->stop_packet = False;
 317         p->timestamp = time(NULL);
 318         p->fd = fd;
 319         p->packet=q;
 320
 321         return p;
 322 }
 323
 324 static struct wins_packet_struct *packet_queue = NULL;
 325
 326 /*******************************************************************
 327   Queue a packet into a packet queue
 328 ******************************************************************/
 329 static void queue_packet(struct wins_packet_struct *packet)
 330 {
 331         struct wins_packet_struct *p;
 332
 333         if (!packet_queue) {
 334                 packet->prev = NULL;
 335                 packet->next = NULL;
 336                 packet_queue = packet;
 337                 return;
 338         }
 339
 340         /* find the bottom */
 341         for (p=packet_queue;p->next;p=p->next)
 342                 ;
 343
 344         p->next = packet;
 345         packet->next = NULL;
 346         packet->prev = p;
 347 }
 348
 349 /****************************************************************************
 350   Listens for NMB or DGRAM packets, and queues them.
 351   return True if the socket is dead
 352 ***************************************************************************/
 353 static BOOL listen_for_wins_packets(void)
 354 {
 355         int num_interfaces = iface_count();
 356         fd_set fds;
 357         int i, num, s, new_s;
 358         struct timeval timeout;
 359
 360         if(listen_set == NULL) {
 361                 if(!create_listen_fdset()) {
 362                         DEBUG(0,("listen_for_packets: Fatal error. unable to create listen set. Exiting.\n"));
 363                         return True;
 364                 }
 365         }
 366
 367         memcpy((char *)&fds, (char *)listen_set, sizeof(fd_set));
 368
 369         timeout.tv_sec = NMBD_SELECT_LOOP;
 370         timeout.tv_usec = 0;
 371
 372         /* Prepare for the select - allow certain signals. */
 373
 374         BlockSignals(False, SIGTERM);
 375
 376         num = sys_select(FD_SETSIZE, &fds, NULL, NULL, &timeout);
 377
 378         /* We can only take signals when we are in the select - block them again here. */
 379
 380         BlockSignals(True, SIGTERM);
 381
 382         if(num == -1)
 383                 return False;
 384
 385         for (; num > 0; num--) {
 386                 s = -1;
 387                 /* check the sockets we are only listening on, waiting to accept */
 388                 for (i=0; i<num_interfaces; i++) {
 389                         struct sockaddr addr;
 390                         socklen_t in_addrlen = sizeof(addr);
 391
 392                         if(FD_ISSET(sock_array[i], &fds)) {
 393                                 s = sock_array[i];
 394                                 /* Clear this so we don't look at it again. */
 395                                 FD_CLR(sock_array[i], &fds);
 396
 397                                 /* accept and add the new socket to the listen set */
 398                                 new_s=accept(s, &addr, &in_addrlen);
 399
 400                                 if (new_s < 0)
 401                                         continue;
 402
 403                                 DEBUG(5,("listen_for_wins_packets: new connection, old: %d, new : %d\n", s, new_s));
 404
 405                                 set_socket_options(new_s, "SO_KEEPALIVE");
 406                                 set_socket_options(new_s, user_socket_options);
 407                                 FD_SET(new_s, listen_set);
 408                                 add_fd_to_sock_array(new_s);
 409                         }
 410                 }
 411
 412                 /*
 413                  * check for the sockets we are waiting data from
 414                  * either client sending datas
 415                  * or reply to our requests
 416                  */
 417                 for (i=num_interfaces; i<listen_number; i++) {
 418                         if(FD_ISSET(sock_array[i], &fds)) {
 419                                 struct wins_packet_struct *packet = read_wins_packet(sock_array[i], timeout.tv_sec);
 420                                 if (packet) {
 421                                         packet->fd = sock_array[i];
 422                                         queue_packet(packet);
 423                                 }
 424                                 DEBUG(2,("listen_for_wins_packets: some data on fd %d\n", sock_array[i]));
 425                                 FD_CLR(sock_array[i], &fds);
 426                                 break;
 427                         }
 428
 429                 }
 430
 431         }
 432
 433         return False;
 434 }
 435
 436
 437 /*******************************************************************
 438   Run elements off the packet queue till its empty
 439 ******************************************************************/
 440
 441 static void run_wins_packet_queue(void)
 442 {
 443         struct wins_packet_struct *p;
 444
 445         while ((p = packet_queue)) {
 446                 packet_queue = p->next;
 447                 if (packet_queue)
 448                         packet_queue->prev = NULL;
 449                 p->next = p->prev = NULL;
 450
 451                 construct_reply(p);
 452
 453                 /* if it was a stop assoc, close the connection */
 454                 if (p->stop_packet) {
 455                         FD_CLR(p->fd, listen_set);
 456                         remove_fd_from_sock_array(p->fd);
 457                         close(p->fd);
 458                 }
 459         }
 460 }
 461
 462 /**************************************************************************** **
 463  The main select loop.
 464  **************************************************************************** */
 465 static void process(void)
 466 {
 467
 468         while( True ) {
 469                 time_t t = time(NULL);
 470
 471                 /* check for internal messages */
 472                 message_dispatch();
 473
 474                 if(listen_for_wins_packets())
 475                         return;
 476
 477                 run_wins_packet_queue();
 478
 479                 run_pull_replication(t);
 480
 481                 run_push_replication(t);
 482
 483                 /*
 484                  * Reload the services file if we got a sighup.
 485                  */
 486
 487                 if(reload_after_sighup) {
 488                         reload_services( True );
 489                         reopen_logs();
 490                         reload_after_sighup = False;
 491                 }
 492
 493                 /* free temp memory */
 494                 talloc_destroy_pool(mem_ctx);
 495
 496                 /* free up temp memory */
 497                 lp_talloc_free();
 498         }
 499 } /* process */
 500
 501 /****************************************************************************
 502   main program
 503 ****************************************************************************/
 504  int main(int argc,char *argv[])
 505 {
 506         /* shall I run as a daemon */
 507         static BOOL is_daemon = False;
 508         static BOOL interactive = False;
 509         static BOOL Fork = True;
 510         static BOOL log_stdout = False;
 511         struct poptOption long_options[] = {
 512                 POPT_AUTOHELP
 513                 { "daemon", 'D', POPT_ARG_VAL, &is_daemon, True, "Become a daemon (default)" },
 514                 { "foreground", 'F', POPT_ARG_VAL, &Fork, False, "Run daemon in foreground (for daemontools, etc)" },
 515                 { "stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
 516                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Run interactive (not a daemon)" },
 517                 { "port", 'p', POPT_ARG_INT, &wins_port, 'p', "Listen on the specified port" },
 518                 POPT_COMMON_SAMBA
 519                 POPT_COMMON_CONNECTION
 520                 POPT_TABLEEND
 521         };
 522         int opt;
 523         poptContext pc;
 524
 525 #ifdef HAVE_SET_AUTH_PARAMETERS
 526         set_auth_parameters(argc,argv);
 527 #endif
 528
 529         pc = poptGetContext("wrepld", argc, (const char **)argv, long_options,
 530                                                 POPT_CONTEXT_KEEP_FIRST);
 531
 532         while ((opt = poptGetNextOpt(pc)) != -1) {
 533                 switch (opt)  {
 534                 case 'i':
 535                         interactive = True;
 536                         Fork = False;
 537                         log_stdout = True;
 538                         break;
 539                 }
 540         }
 541
 542         poptFreeContext(pc);
 543
 544         if (log_stdout && Fork) {
 545                 d_printf("Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n");
 546                 usage(argv[0]);
 547                 exit(1);
 548         }
 549
 550 #ifdef HAVE_SETLUID
 551         /* needed for SecureWare on SCO */
 552         setluid(0);
 553 #endif
 554
 555         sec_init();
 556
 557         load_case_tables();
 558
 559         set_remote_machine_name("wrepld", False);
 560
 561         setup_logging(argv[0],log_stdout);
 562
 563         /* we want to re-seed early to prevent time delays causing
 564            client problems at a later date. (tridge) */
 565         generate_random_buffer(NULL, 0, False);
 566
 567         /* make absolutely sure we run as root - to handle cases where people
 568            are crazy enough to have it setuid */
 569
 570         gain_root_privilege();
 571         gain_root_group_privilege();
 572
 573         fault_setup((void (*)(void *))exit_server);
 574         CatchSignal(SIGTERM , SIGNAL_CAST dflt_sig);
 575
 576         /* we are never interested in SIGPIPE */
 577         BlockSignals(True,SIGPIPE);
 578
 579 #if defined(SIGFPE)
 580         /* we are never interested in SIGFPE */
 581         BlockSignals(True,SIGFPE);
 582 #endif
 583
 584 #if defined(SIGUSR2)
 585         /* We are no longer interested in USR2 */
 586         BlockSignals(True,SIGUSR2);
 587 #endif
 588
 589         /* POSIX demands that signals are inherited. If the invoking process has
 590          * these signals masked, we will have problems, as we won't recieve them. */
 591         BlockSignals(False, SIGHUP);
 592         BlockSignals(False, SIGUSR1);
 593
 594         /* we want total control over the permissions on created files,
 595            so set our umask to 0 */
 596         umask(0);
 597
 598         reopen_logs();
 599
 600         DEBUG(1,( "wrepld version %s started.\n", VERSION));
 601         DEBUGADD(1,( "Copyright Andrew Tridgell and the Samba Team 1992-2002\n"));
 602
 603         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
 604                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
 605
 606         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
 607                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
 608                 exit(1);
 609         }
 610
 611         /*
 612          * Do this before reload_services.
 613          */
 614
 615         if (!reload_services(False))
 616                 return(-1);
 617
 618         if (!init_names())
 619                 return -1;
 620
 621 #ifdef WITH_PROFILE
 622         if (!profile_setup(False)) {
 623                 DEBUG(0,("ERROR: failed to setup profiling\n"));
 624                 return -1;
 625         }
 626 #endif
 627
 628         CatchSignal(SIGHUP,SIGNAL_CAST sig_hup);
 629
 630         DEBUG(3,( "loaded services\n"));
 631
 632         if (!is_daemon && !is_a_socket(0)) {
 633                 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
 634                 is_daemon = True;
 635         }
 636
 637         if (is_daemon && !interactive) {
 638                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
 639                 become_daemon(Fork);
 640         }
 641
 642 #if HAVE_SETPGID
 643         /*
 644          * If we're interactive we want to set our own process group for
 645          * signal management.
 646          */
 647         if (interactive)
 648                 setpgid( (pid_t)0, (pid_t)0);
 649 #endif
 650
 651         if (!directory_exist(lp_lockdir(), NULL)) {
 652                 mkdir(lp_lockdir(), 0755);
 653         }
 654
 655         if (is_daemon) {
 656                 pidfile_create("wrepld");
 657         }
 658
 659         if (!message_init()) {
 660                 exit(1);
 661         }
 662
 663         /* Initialise the memory context */
 664         mem_ctx=talloc_init("wins repl talloc ctx");
 665
 666         /* initialise the global partners table */
 667         partner_count=init_wins_partner_table();
 668
 669         /* We can only take signals in the select. */
 670         BlockSignals( True, SIGTERM );
 671
 672         process();
 673
 674         exit_server("normal exit");
 675         return(0);
 676 }