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 fstring global_sam_name;
  29 extern pstring global_myname;
  30
  31 int am_parent = 1;
  32
  33 /* the last message the was processed */
  34 int last_message = -1;
  35
  36 /* a useful macro to debug the last message processed */
  37 #define LAST_MESSAGE() smb_fn_name(last_message)
  38
  39 extern pstring scope;
  40 extern int DEBUGLEVEL;
  41
  42 extern pstring user_socket_options;
  43
  44 #ifdef WITH_DFS
  45 extern int dcelogin_atmost_once;
  46 #endif /* WITH_DFS */
  47
  48
  49 extern fstring remote_machine;
  50 extern pstring OriginalDir;
  51 extern pstring myhostname;
  52
  53 /****************************************************************************
  54   when exiting, take the whole family
  55 ****************************************************************************/
  56 static void *dflt_sig(void)
  57 {
  58         exit_server("caught signal");
  59         return NULL;
  60 }
  61
  62 /****************************************************************************
  63   Send a SIGTERM to our process group.
  64 *****************************************************************************/
  65 static void  killkids(void)
  66 {
  67         if(am_parent) kill(0,SIGTERM);
  68 }
  69
  70
  71 /****************************************************************************
  72   open the socket communication
  73 ****************************************************************************/
  74 static BOOL open_sockets_inetd(void)
  75 {
  76         extern int Client;
  77
  78         /* Started from inetd. fd 0 is the socket. */
  79         /* We will abort gracefully when the client or remote system
  80            goes away */
  81         Client = dup(0);
  82
  83         /* close our standard file descriptors */
  84         close_low_fds();
  85
  86         set_socket_options(Client,"SO_KEEPALIVE");
  87         set_socket_options(Client,user_socket_options);
  88
  89         return True;
  90 }
  91
  92
  93 /****************************************************************************
  94   open the socket communication
  95 ****************************************************************************/
  96 static BOOL open_sockets(BOOL is_daemon,int port)
  97 {
  98         extern int Client;
  99         int num_interfaces = iface_count();
 100         int fd_listenset[FD_SETSIZE];
 101         fd_set listen_set;
 102         int s;
 103         int i;
 104
 105         if (!is_daemon) {
 106                 return open_sockets_inetd();
 107         }
 108
 109
 110 #ifdef HAVE_ATEXIT
 111         {
 112                 static int atexit_set;
 113                 if(atexit_set == 0) {
 114                         atexit_set=1;
 115                         atexit(killkids);
 116                 }
 117         }
 118 #endif
 119
 120         /* Stop zombies */
 121         CatchChild();
 122
 123
 124         FD_ZERO(&listen_set);
 125
 126         if(lp_interfaces() && lp_bind_interfaces_only()) {
 127                 /* We have been given an interfaces line, and been
 128                    told to only bind to those interfaces. Create a
 129                    socket per interface and bind to only these.
 130                 */
 131
 132                 if(num_interfaces > FD_SETSIZE) {
 133                         DEBUG(0,("open_sockets: Too many interfaces specified to bind to. Number was %d \
 134 max can be %d\n",
 135                                  num_interfaces, FD_SETSIZE));
 136                         return False;
 137                 }
 138
 139                 /* Now open a listen socket for each of the
 140                    interfaces. */
 141                 for(i = 0; i < num_interfaces; i++) {
 142                         struct in_addr *ifip = iface_n_ip(i);
 143
 144                         if(ifip == NULL) {
 145                                 DEBUG(0,("open_sockets: interface %d has NULL IP address !\n", i));
 146                                 continue;
 147                         }
 148                         s = fd_listenset[i] = open_socket_in(SOCK_STREAM, port, 0, ifip->s_addr);
 149                         if(s == -1)
 150                                 return False;
 151                                 /* ready to listen */
 152                         if (listen(s, 5) == -1) {
 153                                 DEBUG(0,("listen: %s\n",strerror(errno)));
 154                                 close(s);
 155                                 return False;
 156                         }
 157                         FD_SET(s,&listen_set);
 158                 }
 159         } else {
 160                 /* Just bind to 0.0.0.0 - accept connections
 161                    from anywhere. */
 162                 num_interfaces = 1;
 163
 164                 /* open an incoming socket */
 165                 s = open_socket_in(SOCK_STREAM, port, 0,
 166                                    interpret_addr(lp_socket_address()));
 167                 if (s == -1)
 168                         return(False);
 169
 170                 /* ready to listen */
 171                 if (listen(s, 5) == -1) {
 172                         DEBUG(0,("open_sockets: listen: %s\n",
 173                                  strerror(errno)));
 174                         close(s);
 175                         return False;
 176                 }
 177
 178                 fd_listenset[0] = s;
 179                 FD_SET(s,&listen_set);
 180         }
 181
 182         /* now accept incoming connections - forking a new process
 183            for each incoming connection */
 184         DEBUG(2,("waiting for a connection\n"));
 185         while (1) {
 186                 fd_set lfds;
 187                 int num;
 188
 189                 memcpy((char *)&lfds, (char *)&listen_set,
 190                        sizeof(listen_set));
 191
 192                 num = sys_select(256,&lfds,NULL);
 193
 194                 if (num == -1 && errno == EINTR)
 195                         continue;
 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                         /* Force parent to check log size after
 258                          * spawning child.  Fix from
 259                          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
 260                          * parent smbd will log to logserver.smb.  It
 261                          * writes only two messages for each child
 262                          * started/finished. But each child writes,
 263                          * say, 50 messages also in logserver.smb,
 264                          * begining with the debug_count of the
 265                          * parent, before the child opens its own log
 266                          * file logserver.client. In a worst case
 267                          * scenario the size of logserver.smb would be
 268                          * checked after about 50*50=2500 messages
 269                          * (ca. 100kb).
 270                          * */
 271                         force_check_log_size();
 272
 273                 } /* end for num */
 274         } /* end while 1 */
 275
 276 /* NOTREACHED   return True; */
 277 }
 278
 279 /****************************************************************************
 280   reload the services file
 281   **************************************************************************/
 282 BOOL reload_services(BOOL test)
 283 {
 284         BOOL ret;
 285
 286         if (lp_loaded()) {
 287                 pstring fname;
 288                 pstrcpy(fname,lp_configfile());
 289                 if (file_exist(fname,NULL) && !strcsequal(fname,servicesf)) {
 290                         pstrcpy(servicesf,fname);
 291                         test = False;
 292                 }
 293         }
 294
 295         reopen_logs();
 296
 297         if (test && !lp_file_list_changed())
 298                 return(True);
 299
 300         lp_killunused(conn_snum_used);
 301
 302         ret = lp_load(servicesf,False,False,True);
 303
 304         load_printers();
 305
 306         /* perhaps the config filename is now set */
 307         if (!test)
 308                 reload_services(True);
 309
 310         reopen_logs();
 311
 312         load_interfaces();
 313
 314         {
 315                 extern int Client;
 316                 if (Client != -1) {
 317                         set_socket_options(Client,"SO_KEEPALIVE");
 318                         set_socket_options(Client,user_socket_options);
 319                 }
 320         }
 321
 322         reset_mangled_cache();
 323
 324         /* this forces service parameters to be flushed */
 325         become_service(NULL,True);
 326
 327         return(ret);
 328 }
 329
 330
 331
 332 /****************************************************************************
 333 this prevents zombie child processes
 334 ****************************************************************************/
 335 BOOL reload_after_sighup = False;
 336
 337 static void sig_hup(int sig)
 338 {
 339         BlockSignals(True,SIGHUP);
 340         DEBUG(0,("Got SIGHUP\n"));
 341
 342         /*
 343          * Fix from <branko.cibej@hermes.si> here.
 344          * We used to reload in the signal handler - this
 345          * is a *BIG* no-no.
 346          */
 347
 348         reload_after_sighup = True;
 349         BlockSignals(False,SIGHUP);
 350 }
 351
 352
 353
 354 #if DUMP_CORE
 355 /*******************************************************************
 356 prepare to dump a core file - carefully!
 357 ********************************************************************/
 358 static BOOL dump_core(void)
 359 {
 360         char *p;
 361         pstring dname;
 362         pstrcpy(dname,debugf);
 363         if ((p=strrchr(dname,'/'))) *p=0;
 364         pstrcat(dname,"/corefiles");
 365         mkdir(dname,0700);
 366         sys_chown(dname,getuid(),getgid());
 367         chmod(dname,0700);
 368         if (chdir(dname)) return(False);
 369         umask(~(0700));
 370
 371 #ifdef HAVE_GETRLIMIT
 372 #ifdef RLIMIT_CORE
 373         {
 374                 struct rlimit rlp;
 375                 getrlimit(RLIMIT_CORE, &rlp);
 376                 rlp.rlim_cur = MAX(4*1024*1024,rlp.rlim_cur);
 377                 setrlimit(RLIMIT_CORE, &rlp);
 378                 getrlimit(RLIMIT_CORE, &rlp);
 379                 DEBUG(3,("Core limits now %d %d\n",
 380                          (int)rlp.rlim_cur,(int)rlp.rlim_max));
 381         }
 382 #endif
 383 #endif
 384
 385
 386         DEBUG(0,("Dumping core in %s\n",dname));
 387         abort();
 388         return(True);
 389 }
 390 #endif
 391
 392
 393 /****************************************************************************
 394 exit the server
 395 ****************************************************************************/
 396 void exit_server(char *reason)
 397 {
 398         static int firsttime=1;
 399         extern char *last_inbuf;
 400
 401
 402         if (!firsttime) exit(0);
 403         firsttime = 0;
 404
 405         unbecome_user();
 406         DEBUG(2,("Closing connections\n"));
 407
 408         conn_close_all();
 409
 410 #ifdef WITH_DFS
 411         if (dcelogin_atmost_once) {
 412                 dfs_unlogin();
 413         }
 414 #endif
 415
 416         if (!reason) {
 417                 int oldlevel = DEBUGLEVEL;
 418                 DEBUGLEVEL = 10;
 419                 DEBUG(0,("Last message was %s\n",smb_fn_name(last_message)));
 420                 if (last_inbuf)
 421                         show_msg(last_inbuf);
 422                 DEBUGLEVEL = oldlevel;
 423                 DEBUG(0,("===============================================================\n"));
 424 #if DUMP_CORE
 425                 if (dump_core()) return;
 426 #endif
 427         }
 428
 429         locking_end();
 430
 431         DEBUG(3,("Server exit (%s)\n", (reason ? reason : "")));
 432 #ifdef MEM_MAN
 433         {
 434                 extern FILE *dbf;
 435                 smb_mem_write_verbose(dbf);
 436                 dbgflush();
 437         }
 438 #endif
 439         exit(0);
 440 }
 441
 442
 443
 444 /****************************************************************************
 445   initialise connect, service and file structs
 446 ****************************************************************************/
 447 static void init_structs(void )
 448 {
 449         get_myname(myhostname,NULL);
 450
 451         /*
 452          * Set the machine NETBIOS name if not already
 453          * set from the config file.
 454          */
 455
 456         if (!*global_myname) {
 457                 char *p;
 458                 fstrcpy( global_myname, myhostname );
 459                 p = strchr( global_myname, '.' );
 460                 if (p)
 461                         *p = 0;
 462         }
 463
 464         strupper( global_myname );
 465
 466         conn_init();
 467
 468         file_init();
 469
 470         /* for RPC pipes */
 471         init_rpc_pipe_hnd();
 472
 473         /* for LSA handles */
 474         init_lsa_policy_hnd();
 475
 476         init_dptrs();
 477 }
 478
 479 /****************************************************************************
 480 usage on the program
 481 ****************************************************************************/
 482 static void usage(char *pname)
 483 {
 484         DEBUG(0,("Incorrect program usage - are you sure the command line is correct?\n"));
 485
 486         printf("Usage: %s [-D] [-p port] [-d debuglevel] ", pname);
 487         printf("[-l log basename] [-s services file]\n" );
 488         printf("Version %s\n",VERSION);
 489         printf("\t-D                    become a daemon\n");
 490         printf("\t-p port               listen on the specified port\n");
 491         printf("\t-d debuglevel         set the debuglevel\n");
 492         printf("\t-l log basename.      Basename for log/debug files\n");
 493         printf("\t-s services file.     Filename of services file\n");
 494         printf("\t-P                    passive only\n");
 495         printf("\t-a                    append to log file (default)\n");
 496         printf("\t-o                    overwrite log file, don't append\n");
 497         printf("\t-i scope              NetBIOS scope to use (default none)\n");
 498         printf("\n");
 499 }
 500
 501
 502 /****************************************************************************
 503   main program
 504 ****************************************************************************/
 505  int main(int argc,char *argv[])
 506 {
 507         extern BOOL append_log;
 508         /* shall I run as a daemon */
 509         BOOL is_daemon = False;
 510         int port = SMB_PORT;
 511         int opt;
 512         extern char *optarg;
 513
 514 #ifdef HAVE_SET_AUTH_PARAMETERS
 515         set_auth_parameters(argc,argv);
 516 #endif
 517
 518 #ifdef HAVE_SETLUID
 519         /* needed for SecureWare on SCO */
 520         setluid(0);
 521 #endif
 522
 523         append_log = True;
 524
 525         TimeInit();
 526
 527         pstrcpy(debugf,SMBLOGFILE);
 528
 529         pstrcpy(remote_machine, "smb");
 530
 531         setup_logging(argv[0],False);
 532
 533         charset_initialise();
 534
 535         /* make absolutely sure we run as root - to handle cases where people
 536            are crazy enough to have it setuid */
 537 #ifdef HAVE_SETRESUID
 538         setresuid(0,0,0);
 539 #else
 540         setuid(0);
 541         seteuid(0);
 542         setuid(0);
 543         seteuid(0);
 544 #endif
 545
 546         fault_setup((void (*)(void *))exit_server);
 547         CatchSignal(SIGTERM , SIGNAL_CAST dflt_sig);
 548
 549         /* we are never interested in SIGPIPE */
 550         BlockSignals(True,SIGPIPE);
 551
 552         /* we want total control over the permissions on created files,
 553            so set our umask to 0 */
 554         umask(0);
 555
 556         GetWd(OriginalDir);
 557
 558         init_uid();
 559
 560         /* this is for people who can't start the program correctly */
 561         while (argc > 1 && (*argv[1] != '-')) {
 562                 argv++;
 563                 argc--;
 564         }
 565
 566         while ( EOF != (opt = getopt(argc, argv, "O:i:l:s:d:Dp:h?Paof:")) )
 567                 switch (opt)  {
 568                 case 'O':
 569                         pstrcpy(user_socket_options,optarg);
 570                         break;
 571
 572                 case 'i':
 573                         pstrcpy(scope,optarg);
 574                         break;
 575
 576                 case 'P':
 577                         {
 578                                 extern BOOL passive;
 579                                 passive = True;
 580                         }
 581                         break;
 582
 583                 case 's':
 584                         pstrcpy(servicesf,optarg);
 585                         break;
 586
 587                 case 'l':
 588                         pstrcpy(debugf,optarg);
 589                         break;
 590
 591                 case 'a':
 592                         append_log = True;
 593                         break;
 594
 595                 case 'o':
 596                         append_log = False;
 597                         break;
 598
 599                 case 'D':
 600                         is_daemon = True;
 601                         break;
 602
 603                 case 'd':
 604                         if (*optarg == 'A')
 605                                 DEBUGLEVEL = 10000;
 606                         else
 607                                 DEBUGLEVEL = atoi(optarg);
 608                         break;
 609
 610                 case 'p':
 611                         port = atoi(optarg);
 612                         break;
 613
 614                 case 'h':
 615                 case '?':
 616                         usage(argv[0]);
 617                         exit(0);
 618                         break;
 619
 620                 default:
 621                         usage(argv[0]);
 622                         exit(1);
 623                 }
 624
 625         reopen_logs();
 626
 627         DEBUG(1,( "smbd version %s started.\n", VERSION));
 628         DEBUGADD(1,( "Copyright Andrew Tridgell 1992-1998\n"));
 629
 630         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
 631                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
 632
 633         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
 634                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
 635                 exit(1);
 636         }
 637
 638         if (!reload_services(False))
 639                 return(-1);
 640
 641         init_structs();
 642
 643 #ifdef WITH_SSL
 644         {
 645                 extern BOOL sslEnabled;
 646                 sslEnabled = lp_ssl_enabled();
 647                 if(sslEnabled)
 648                         sslutil_init(True);
 649         }
 650 #endif        /* WITH_SSL */
 651
 652         codepage_initialise(lp_client_code_page());
 653
 654         fstrcpy(global_myworkgroup, lp_workgroup());
 655
 656         get_sam_domain_name();
 657
 658         generate_wellknown_sids();
 659
 660         if (!generate_sam_sid())
 661         {
 662                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
 663                 exit(1);
 664         }
 665
 666         if (lp_security() == SEC_DOMAIN && !get_member_domain_sid())
 667         {
 668                 DEBUG(0,("ERROR: Samba cannot obtain PDC SID from PDC(s) %s.\n",
 669                           lp_passwordserver()));
 670                 exit(1);
 671         }
 672
 673         CatchSignal(SIGHUP,SIGNAL_CAST sig_hup);
 674
 675         /* Setup the signals that allow the debug log level
 676            to by dynamically changed. */
 677
 678         /* If we are using the malloc debug code we can't use
 679            SIGUSR1 and SIGUSR2 to do debug level changes. */
 680
 681 #ifndef MEM_MAN
 682 #if defined(SIGUSR1)
 683         CatchSignal( SIGUSR1, SIGNAL_CAST sig_usr1 );
 684 #endif /* SIGUSR1 */
 685
 686 #if defined(SIGUSR2)
 687         CatchSignal( SIGUSR2, SIGNAL_CAST sig_usr2 );
 688 #endif /* SIGUSR2 */
 689 #endif /* MEM_MAN */
 690
 691         DEBUG(3,( "loaded services\n"));
 692
 693         if (!is_daemon && !is_a_socket(0)) {
 694                 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
 695                 is_daemon = True;
 696         }
 697
 698         if (is_daemon) {
 699                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
 700                 become_daemon();
 701         }
 702
 703     check_kernel_oplocks();
 704
 705         if (!directory_exist(lp_lockdir(), NULL)) {
 706                 mkdir(lp_lockdir(), 0755);
 707         }
 708
 709         if (is_daemon) {
 710                 pidfile_create("smbd");
 711         }
 712
 713         if (!open_sockets(is_daemon,port))
 714                 exit(1);
 715
 716         if (!locking_init(0))
 717                 exit(1);
 718
 719         if(!initialise_passgrp_db())
 720                 exit(1);
 721
 722         if(!initialise_password_db())
 723                 exit(1);
 724
 725         if(!initialise_group_db())
 726                 exit(1);
 727
 728         if(!initialise_alias_db())
 729                 exit(1);
 730
 731         /* possibly reload the services file. */
 732         reload_services(True);
 733
 734         if (*lp_rootdir()) {
 735                 if (sys_chroot(lp_rootdir()) == 0)
 736                         DEBUG(2,("Changed root to %s\n", lp_rootdir()));
 737         }
 738
 739         /* Setup the oplock IPC socket. */
 740         if( !open_oplock_ipc() )
 741                 exit(1);
 742
 743         smbd_process();
 744         close_sockets();
 745
 746         exit_server("normal exit");
 747         return(0);
 748 }