release/src/router/samba/source/smbd/server.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    Main SMB server routines
   5    Copyright (C) Andrew Tridgell 1992-1998
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23 #include "trans2.h"
  24
  25 pstring servicesf = CONFIGFILE;
  26 extern pstring debugf;
  27 extern fstring global_myworkgroup;
  28 extern pstring global_myname;
  29
  30 int am_parent = 1;
  31
  32 /* the last message the was processed */
  33 int last_message = -1;
  34
  35 /* a useful macro to debug the last message processed */
  36 #define LAST_MESSAGE() smb_fn_name(last_message)
  37
  38 extern int DEBUGLEVEL;
  39
  40 extern pstring user_socket_options;
  41
  42 #ifdef WITH_DFS
  43 extern int dcelogin_atmost_once;
  44 #endif /* WITH_DFS */
  45
  46
  47 extern fstring remote_machine;
  48 extern pstring OriginalDir;
  49
  50 /****************************************************************************
  51   when exiting, take the whole family
  52 ****************************************************************************/
  53 static void *dflt_sig(void)
  54 {
  55         exit_server("caught signal");
  56         return NULL;
  57 }
  58
  59 /****************************************************************************
  60   Send a SIGTERM to our process group.
  61 *****************************************************************************/
  62 static void  killkids(void)
  63 {
  64         if(am_parent) kill(0,SIGTERM);
  65 }
  66
  67
  68 /****************************************************************************
  69   open the socket communication
  70 ****************************************************************************/
  71 static BOOL open_sockets_inetd(void)
  72 {
  73         extern int Client;
  74
  75         /* Started from inetd. fd 0 is the socket. */
  76         /* We will abort gracefully when the client or remote system
  77            goes away */
  78         Client = dup(0);
  79
  80         /* close our standard file descriptors */
  81         close_low_fds();
  82
  83         set_socket_options(Client,"SO_KEEPALIVE");
  84         set_socket_options(Client,user_socket_options);
  85
  86         return True;
  87 }
  88
  89
  90 /****************************************************************************
  91   open the socket communication
  92 ****************************************************************************/
  93 static BOOL open_sockets(BOOL is_daemon,int port)
  94 {
  95         extern int Client;
  96         int num_interfaces = iface_count();
  97         int fd_listenset[FD_SETSIZE];
  98         fd_set listen_set;
  99         int s;
 100         int i;
 101
 102         if (!is_daemon) {
 103                 return open_sockets_inetd();
 104         }
 105
 106
 107 #ifdef HAVE_ATEXIT
 108         {
 109                 static int atexit_set;
 110                 if(atexit_set == 0) {
 111                         atexit_set=1;
 112                         atexit(killkids);
 113                 }
 114         }
 115 #endif
 116
 117         /* Stop zombies */
 118         CatchChild();
 119
 120
 121         FD_ZERO(&listen_set);
 122
 123         if(lp_interfaces() && lp_bind_interfaces_only()) {
 124                 /* We have been given an interfaces line, and been
 125                    told to only bind to those interfaces. Create a
 126                    socket per interface and bind to only these.
 127                 */
 128
 129                 if(num_interfaces > FD_SETSIZE) {
 130                         DEBUG(0,("open_sockets: Too many interfaces specified to bind to. Number was %d \
 131 max can be %d\n",
 132                                  num_interfaces, FD_SETSIZE));
 133                         return False;
 134                 }
 135
 136                 /* Now open a listen socket for each of the
 137                    interfaces. */
 138                 for(i = 0; i < num_interfaces; i++) {
 139                         struct in_addr *ifip = iface_n_ip(i);
 140
 141                         if(ifip == NULL) {
 142                                 DEBUG(0,("open_sockets: interface %d has NULL IP address !\n", i));
 143                                 continue;
 144                         }
 145                         s = fd_listenset[i] = open_socket_in(SOCK_STREAM, port, 0, ifip->s_addr, True);
 146                         if(s == -1)
 147                                 return False;
 148                                 /* ready to listen */
 149                         if (listen(s, 5) == -1) {
 150                                 DEBUG(0,("listen: %s\n",strerror(errno)));
 151                                 close(s);
 152                                 return False;
 153                         }
 154                         FD_SET(s,&listen_set);
 155                 }
 156         } else {
 157                 /* Just bind to 0.0.0.0 - accept connections
 158                    from anywhere. */
 159                 num_interfaces = 1;
 160
 161                 /* open an incoming socket */
 162                 s = open_socket_in(SOCK_STREAM, port, 0,
 163                                    interpret_addr(lp_socket_address()),True);
 164                 if (s == -1)
 165                         return(False);
 166
 167                 /* ready to listen */
 168                 if (listen(s, 5) == -1) {
 169                         DEBUG(0,("open_sockets: listen: %s\n",
 170                                  strerror(errno)));
 171                         close(s);
 172                         return False;
 173                 }
 174
 175                 fd_listenset[0] = s;
 176                 FD_SET(s,&listen_set);
 177         }
 178
 179         /* now accept incoming connections - forking a new process
 180            for each incoming connection */
 181         DEBUG(2,("waiting for a connection\n"));
 182         while (1) {
 183                 fd_set lfds;
 184                 int num;
 185
 186                 memcpy((char *)&lfds, (char *)&listen_set,
 187                        sizeof(listen_set));
 188
 189                 num = sys_select(FD_SETSIZE,&lfds,NULL);
 190
 191                 if (num == -1 && errno == EINTR)
 192                         continue;
 193
 194                 /* check if we need to reload services */
 195                 check_reload(time(NULL));
 196
 197                 /* Find the sockets that are read-ready -
 198                    accept on these. */
 199                 for( ; num > 0; num--) {
 200                         struct sockaddr addr;
 201                         int in_addrlen = sizeof(addr);
 202
 203                         s = -1;
 204                         for(i = 0; i < num_interfaces; i++) {
 205                                 if(FD_ISSET(fd_listenset[i],&lfds)) {
 206                                         s = fd_listenset[i];
 207                                         /* Clear this so we don't look
 208                                            at it again. */
 209                                         FD_CLR(fd_listenset[i],&lfds);
 210                                         break;
 211                                 }
 212                         }
 213
 214                         Client = accept(s,&addr,&in_addrlen);
 215
 216                         if (Client == -1 && errno == EINTR)
 217                                 continue;
 218
 219                         if (Client == -1) {
 220                                 DEBUG(0,("open_sockets: accept: %s\n",
 221                                          strerror(errno)));
 222                                 continue;
 223                         }
 224
 225                         if (Client != -1 && fork()==0) {
 226                                 /* Child code ... */
 227
 228                                 /* close the listening socket(s) */
 229                                 for(i = 0; i < num_interfaces; i++)
 230                                         close(fd_listenset[i]);
 231
 232                                 /* close our standard file
 233                                    descriptors */
 234                                 close_low_fds();
 235                                 am_parent = 0;
 236
 237                                 set_socket_options(Client,"SO_KEEPALIVE");
 238                                 set_socket_options(Client,user_socket_options);
 239
 240                                 /* Reset global variables in util.c so
 241                                    that client substitutions will be
 242                                    done correctly in the process.  */
 243                                 reset_globals_after_fork();
 244
 245                 /*
 246                  * Ensure this child has kernel oplock
 247                  * capabilities, but not it's children.
 248                  */
 249                 set_process_capability(KERNEL_OPLOCK_CAPABILITY, True);
 250                 set_inherited_process_capability(KERNEL_OPLOCK_CAPABILITY, False);
 251
 252                                 return True;
 253                         }
 254                         /* The parent doesn't need this socket */
 255                         close(Client);
 256
 257                         /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
 258                                 Clear the closed fd info out of Client in
 259                                 util_sock.c to avoid a possible
 260                                 getpeername failure if we reopen the logs
 261                                 and use %I in the filename.
 262                         */
 263                         Client = -1;
 264
 265                         /* Force parent to check log size after
 266                          * spawning child.  Fix from
 267                          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
 268                          * parent smbd will log to logserver.smb.  It
 269                          * writes only two messages for each child
 270                          * started/finished. But each child writes,
 271                          * say, 50 messages also in logserver.smb,
 272                          * begining with the debug_count of the
 273                          * parent, before the child opens its own log
 274                          * file logserver.client. In a worst case
 275                          * scenario the size of logserver.smb would be
 276                          * checked after about 50*50=2500 messages
 277                          * (ca. 100kb).
 278                          * */
 279                         force_check_log_size();
 280
 281                 } /* end for num */
 282         } /* end while 1 */
 283
 284 /* NOTREACHED   return True; */
 285 }
 286
 287 /****************************************************************************
 288   reload the services file
 289   **************************************************************************/
 290 BOOL reload_services(BOOL test)
 291 {
 292         BOOL ret;
 293
 294         if (lp_loaded()) {
 295                 pstring fname;
 296                 pstrcpy(fname,lp_configfile());
 297                 if (file_exist(fname,NULL) && !strcsequal(fname,servicesf)) {
 298                         pstrcpy(servicesf,fname);
 299                         test = False;
 300                 }
 301         }
 302
 303         reopen_logs();
 304
 305         if (test && !lp_file_list_changed())
 306                 return(True);
 307
 308         lp_killunused(conn_snum_used);
 309
 310         ret = lp_load(servicesf,False,False,True);
 311 #ifdef PRINTING
 312         load_printers();
 313 #endif
 314         /* perhaps the config filename is now set */
 315         if (!test)
 316                 reload_services(True);
 317
 318         reopen_logs();
 319
 320         load_interfaces();
 321
 322         {
 323                 extern int Client;
 324                 if (Client != -1) {
 325                         set_socket_options(Client,"SO_KEEPALIVE");
 326                         set_socket_options(Client,user_socket_options);
 327                 }
 328         }
 329
 330         reset_mangled_cache();
 331     reset_stat_cache();
 332
 333         /* this forces service parameters to be flushed */
 334         become_service(NULL,True);
 335
 336         return(ret);
 337 }
 338
 339
 340
 341 /****************************************************************************
 342  Catch a sighup.
 343 ****************************************************************************/
 344
 345 VOLATILE SIG_ATOMIC_T reload_after_sighup = False;
 346
 347 static void sig_hup(int sig)
 348 {
 349         BlockSignals(True,SIGHUP);
 350         DEBUG(1,("Got SIGHUP\n"));
 351
 352         /*
 353          * Fix from <branko.cibej@hermes.si> here.
 354          * We used to reload in the signal handler - this
 355          * is a *BIG* no-no.
 356          */
 357
 358         reload_after_sighup = True;
 359         BlockSignals(False,SIGHUP);
 360 }
 361
 362
 363
 364 #if DUMP_CORE
 365 /*******************************************************************
 366 prepare to dump a core file - carefully!
 367 ********************************************************************/
 368 static BOOL dump_core(void)
 369 {
 370         char *p;
 371         pstring dname;
 372         pstrcpy(dname,debugf);
 373         if ((p=strrchr(dname,'/'))) *p=0;
 374         pstrcat(dname,"/corefiles");
 375         mkdir(dname,0700);
 376         sys_chown(dname,getuid(),getgid());
 377         chmod(dname,0700);
 378         if (chdir(dname)) return(False);
 379         umask(~(0700));
 380
 381 #ifdef HAVE_GETRLIMIT
 382 #ifdef RLIMIT_CORE
 383         {
 384                 struct rlimit rlp;
 385                 getrlimit(RLIMIT_CORE, &rlp);
 386                 rlp.rlim_cur = MAX(4*1024*1024,rlp.rlim_cur);
 387                 setrlimit(RLIMIT_CORE, &rlp);
 388                 getrlimit(RLIMIT_CORE, &rlp);
 389                 DEBUG(3,("Core limits now %d %d\n",
 390                          (int)rlp.rlim_cur,(int)rlp.rlim_max));
 391         }
 392 #endif
 393 #endif
 394
 395
 396         DEBUG(0,("Dumping core in %s\n",dname));
 397         abort();
 398         return(True);
 399 }
 400 #endif
 401
 402
 403 /****************************************************************************
 404 exit the server
 405 ****************************************************************************/
 406 void exit_server(char *reason)
 407 {
 408         static int firsttime=1;
 409         extern char *last_inbuf;
 410
 411
 412         if (!firsttime) exit(0);
 413         firsttime = 0;
 414
 415         unbecome_user();
 416         DEBUG(2,("Closing connections\n"));
 417
 418         conn_close_all();
 419
 420     respond_to_all_remaining_local_messages();
 421
 422 #ifdef WITH_DFS
 423         if (dcelogin_atmost_once) {
 424                 dfs_unlogin();
 425         }
 426 #endif
 427
 428         if (!reason) {
 429                 int oldlevel = DEBUGLEVEL;
 430                 DEBUGLEVEL = 10;
 431                 DEBUG(0,("Last message was %s\n",smb_fn_name(last_message)));
 432                 if (last_inbuf)
 433                         show_msg(last_inbuf);
 434                 DEBUGLEVEL = oldlevel;
 435                 DEBUG(0,("===============================================================\n"));
 436 #if DUMP_CORE
 437                 if (dump_core()) return;
 438 #endif
 439         }
 440
 441         locking_end();
 442
 443         DEBUG(3,("Server exit (%s)\n", (reason ? reason : "")));
 444         exit(0);
 445 }
 446
 447
 448
 449 /****************************************************************************
 450   initialise connect, service and file structs
 451 ****************************************************************************/
 452 static void init_structs(void )
 453 {
 454         /*
 455          * Set the machine NETBIOS name if not already
 456          * set from the config file.
 457          */
 458
 459         if (!*global_myname) {
 460                 char *p;
 461                 fstrcpy( global_myname, myhostname() );
 462                 p = strchr( global_myname, '.' );
 463                 if (p)
 464                         *p = 0;
 465         }
 466
 467         strupper( global_myname );
 468
 469         conn_init();
 470
 471         file_init();
 472
 473         /* for RPC pipes */
 474         init_rpc_pipe_hnd();
 475
 476         /* for LSA handles */
 477         init_lsa_policy_hnd();
 478
 479         init_dptrs();
 480 }
 481
 482 /****************************************************************************
 483 usage on the program
 484 ****************************************************************************/
 485 static void usage(char *pname)
 486 {
 487
 488         printf("Usage: %s [-DaoPh?V] [-d debuglevel] [-l log basename] [-p port]\n", pname);
 489         printf("       [-O socket options] [-s services file]\n");
 490         printf("\t-D                    Become a daemon\n");
 491         printf("\t-a                    Append to log file (default)\n");
 492         printf("\t-o                    Overwrite log file, don't append\n");
 493         printf("\t-P                    Passive only\n");
 494         printf("\t-h                    Print usage\n");
 495         printf("\t-?                    Print usage\n");
 496         printf("\t-V                    Print version\n");
 497         printf("\t-d debuglevel         Set the debuglevel\n");
 498         printf("\t-l log basename.      Basename for log/debug files\n");
 499         printf("\t-p port               Listen on the specified port\n");
 500         printf("\t-O socket options     Socket options\n");
 501         printf("\t-s services file.     Filename of services file\n");
 502         printf("\n");
 503 }
 504
 505
 506 /****************************************************************************
 507   main program
 508 ****************************************************************************/
 509  int main(int argc,char *argv[])
 510 {
 511         extern BOOL append_log;
 512         /* shall I run as a daemon */
 513         BOOL is_daemon = False;
 514         BOOL specified_logfile = False;
 515         int port = SMB_PORT;
 516         int opt;
 517         extern char *optarg;
 518
 519 #ifdef HAVE_SET_AUTH_PARAMETERS
 520         set_auth_parameters(argc,argv);
 521 #endif
 522
 523         /* this is for people who can't start the program correctly */
 524         while (argc > 1 && (*argv[1] != '-')) {
 525                 argv++;
 526                 argc--;
 527         }
 528
 529         while ( EOF != (opt = getopt(argc, argv, "O:i:l:s:d:Dp:h?VPaof:")) )
 530                 switch (opt)  {
 531                 case 'O':
 532                         pstrcpy(user_socket_options,optarg);
 533                         break;
 534
 535                 case 'P':
 536                         {
 537                                 extern BOOL passive;
 538                                 passive = True;
 539                         }
 540                         break;
 541
 542                 case 's':
 543                         pstrcpy(servicesf,optarg);
 544                         break;
 545
 546                 case 'l':
 547                         specified_logfile = True;
 548                         pstrcpy(debugf,optarg);
 549                         break;
 550
 551                 case 'a':
 552                         append_log = True;
 553                         break;
 554
 555                 case 'o':
 556                         append_log = False;
 557                         break;
 558
 559                 case 'D':
 560                         is_daemon = True;
 561                         break;
 562
 563                 case 'd':
 564                         if (*optarg == 'A')
 565                                 DEBUGLEVEL = 10000;
 566                         else
 567                                 DEBUGLEVEL = atoi(optarg);
 568                         break;
 569
 570                 case 'p':
 571                         port = atoi(optarg);
 572                         break;
 573
 574                 case 'h':
 575                 case '?':
 576                         usage(argv[0]);
 577                         exit(0);
 578                         break;
 579
 580                 case 'V':
 581                         printf("Version %s\n",VERSION);
 582                         exit(0);
 583                         break;
 584                 default:
 585                         DEBUG(0,("Incorrect program usage - are you sure the command line is correct?\n"));
 586                         usage(argv[0]);
 587                         exit(1);
 588                 }
 589
 590 #ifdef HAVE_SETLUID
 591         /* needed for SecureWare on SCO */
 592         setluid(0);
 593 #endif
 594
 595         /*
 596          * gain_root_privilege uses an assert than will cause a core
 597          * dump if euid != 0. Ensure this is the case.
 598          */
 599
 600         if(geteuid() != (uid_t)0) {
 601                 fprintf(stderr, "%s: Version %s : Must have effective user id of zero to run.\n", argv[0], VERSION);
 602                 exit(1);
 603         }
 604
 605         append_log = True;
 606
 607         TimeInit();
 608
 609         if(!specified_logfile)
 610                 pstrcpy(debugf,SMBLOGFILE);
 611
 612         pstrcpy(remote_machine, "smb");
 613
 614         setup_logging(argv[0],False);
 615
 616         charset_initialise();
 617
 618         /* we want to re-seed early to prevent time delays causing
 619            client problems at a later date. (tridge) */
 620         generate_random_buffer(NULL, 0, False);
 621
 622         /* make absolutely sure we run as root - to handle cases where people
 623            are crazy enough to have it setuid */
 624
 625         gain_root_privilege();
 626         gain_root_group_privilege();
 627
 628         fault_setup((void (*)(void *))exit_server);
 629         CatchSignal(SIGTERM , SIGNAL_CAST dflt_sig);
 630
 631         /* we are never interested in SIGPIPE */
 632         BlockSignals(True,SIGPIPE);
 633
 634 #if defined(SIGFPE)
 635         /* we are never interested in SIGFPE */
 636         BlockSignals(True,SIGFPE);
 637 #endif
 638
 639         /* we want total control over the permissions on created files,
 640            so set our umask to 0 */
 641         umask(0);
 642
 643         dos_GetWd(OriginalDir);
 644
 645         init_uid();
 646
 647         reopen_logs();
 648
 649         DEBUG(1,( "smbd version %s started.\n", VERSION));
 650         DEBUGADD(1,( "Copyright Andrew Tridgell 1992-1998\n"));
 651
 652         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
 653                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
 654
 655         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
 656                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
 657                 exit(1);
 658         }
 659
 660         /*
 661          * Do this before reload_services.
 662          */
 663
 664         if (!reload_services(False))
 665                 return(-1);
 666
 667         init_structs();
 668
 669 #ifdef WITH_PROFILE
 670         if (!profile_setup(False)) {
 671                 DEBUG(0,("ERROR: failed to setup profiling\n"));
 672                 return -1;
 673         }
 674 #endif
 675
 676 #ifdef WITH_SSL
 677         {
 678                 extern BOOL sslEnabled;
 679                 sslEnabled = lp_ssl_enabled();
 680                 if(sslEnabled)
 681                         sslutil_init(True);
 682         }
 683 #endif        /* WITH_SSL */
 684
 685         codepage_initialise(lp_client_code_page());
 686
 687         fstrcpy(global_myworkgroup, lp_workgroup());
 688
 689         if(!pdb_generate_sam_sid()) {
 690                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
 691                 exit(1);
 692         }
 693
 694         CatchSignal(SIGHUP,SIGNAL_CAST sig_hup);
 695
 696         /* Setup the signals that allow the debug log level
 697            to by dynamically changed. */
 698
 699         /* If we are using the malloc debug code we can't use
 700            SIGUSR1 and SIGUSR2 to do debug level changes. */
 701
 702 #ifndef MEM_MAN
 703 #if defined(SIGUSR1)
 704         CatchSignal( SIGUSR1, SIGNAL_CAST sig_usr1 );
 705 #endif /* SIGUSR1 */
 706
 707 #if defined(SIGUSR2)
 708         CatchSignal( SIGUSR2, SIGNAL_CAST sig_usr2 );
 709 #endif /* SIGUSR2 */
 710 #endif /* MEM_MAN */
 711
 712         DEBUG(3,( "loaded services\n"));
 713
 714         if (!is_daemon && !is_a_socket(0)) {
 715                 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
 716                 is_daemon = True;
 717         }
 718
 719         if (is_daemon) {
 720                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
 721                 become_daemon();
 722         }
 723
 724     check_kernel_oplocks();
 725
 726         if (!directory_exist(lp_lockdir(), NULL)) {
 727                 mkdir(lp_lockdir(), 0755);
 728         }
 729
 730         if (is_daemon) {
 731                 pidfile_create("smbd");
 732         }
 733
 734         if (!open_sockets(is_daemon,port))
 735                 exit(1);
 736
 737         /*
 738          * Note that this call should be done after the fork() call
 739          * in open_sockets(), as some versions of the locking shared
 740          * memory code register openers in a flat file.
 741          */
 742
 743         if (!locking_init(0))
 744                 exit(1);
 745
 746         if(!initialize_password_db())
 747                 exit(1);
 748
 749         /* possibly reload the services file. */
 750         reload_services(True);
 751
 752         if (*lp_rootdir()) {
 753                 if (sys_chroot(lp_rootdir()) == 0)
 754                         DEBUG(2,("Changed root to %s\n", lp_rootdir()));
 755         }
 756
 757         /* Setup the oplock IPC socket. */
 758         if( !open_oplock_ipc() )
 759                 exit(1);
 760
 761         smbd_process();
 762         close_sockets();
 763
 764         exit_server("normal exit");
 765         return(0);
 766 }