/* Unix SMB/Netbios implementation. Version 1.9. Main SMB server routines Copyright (C) Andrew Tridgell 1992-1998 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "includes.h" pstring servicesf = CONFIGFILE; extern pstring debugf; extern fstring global_myworkgroup; extern pstring global_myname; int am_parent = 1; /* the last message the was processed */ int last_message = -1; /* a useful macro to debug the last message processed */ #define LAST_MESSAGE() smb_fn_name(last_message) extern int DEBUGLEVEL; extern pstring user_socket_options; #ifdef WITH_DFS extern int dcelogin_atmost_once; #endif /* WITH_DFS */ extern fstring remote_machine; extern pstring OriginalDir; /* really we should have a top level context structure that has the client file descriptor as an element. That would require a major rewrite :( the following 2 functions are an alternative - they make the file descriptor private to smbd */ static int server_fd; int smbd_server_fd(void) { return server_fd; } void smbd_set_server_fd(int fd) { server_fd = fd; client_setfd(fd); } /**************************************************************************** when exiting, take the whole family ****************************************************************************/ static void *dflt_sig(void) { exit_server("caught signal"); return NULL; } /**************************************************************************** Send a SIGTERM to our process group. *****************************************************************************/ static void killkids(void) { if(am_parent) kill(0,SIGTERM); } /**************************************************************************** open the socket communication ****************************************************************************/ static BOOL open_sockets_inetd(void) { /* Started from inetd. fd 0 is the socket. */ /* We will abort gracefully when the client or remote system goes away */ smbd_set_server_fd(dup(0)); /* close our standard file descriptors */ close_low_fds(); set_socket_options(smbd_server_fd(),"SO_KEEPALIVE"); set_socket_options(smbd_server_fd(),user_socket_options); return True; } /**************************************************************************** open the socket communication ****************************************************************************/ static BOOL open_sockets(BOOL is_daemon,int port) { int num_interfaces = iface_count(); int fd_listenset[FD_SETSIZE]; fd_set listen_set; int s; int i; if (!is_daemon) { return open_sockets_inetd(); } #ifdef HAVE_ATEXIT { static int atexit_set; if(atexit_set == 0) { atexit_set=1; atexit(killkids); } } #endif /* Stop zombies */ CatchChild(); FD_ZERO(&listen_set); if(lp_interfaces() && lp_bind_interfaces_only()) { /* We have been given an interfaces line, and been told to only bind to those interfaces. Create a socket per interface and bind to only these. */ if(num_interfaces > FD_SETSIZE) { DEBUG(0,("open_sockets: Too many interfaces specified to bind to. Number was %d \ max can be %d\n", num_interfaces, FD_SETSIZE)); return False; } /* Now open a listen socket for each of the interfaces. */ for(i = 0; i < num_interfaces; i++) { struct in_addr *ifip = iface_n_ip(i); if(ifip == NULL) { DEBUG(0,("open_sockets: interface %d has NULL IP address !\n", i)); continue; } s = fd_listenset[i] = open_socket_in(SOCK_STREAM, port, 0, ifip->s_addr, True); if(s == -1) return False; /* ready to listen */ if (listen(s, 5) == -1) { DEBUG(0,("listen: %s\n",strerror(errno))); close(s); return False; } FD_SET(s,&listen_set); } } else { /* Just bind to 0.0.0.0 - accept connections from anywhere. */ num_interfaces = 1; /* open an incoming socket */ s = open_socket_in(SOCK_STREAM, port, 0, interpret_addr(lp_socket_address()),True); if (s == -1) return(False); /* ready to listen */ if (listen(s, 5) == -1) { DEBUG(0,("open_sockets: listen: %s\n", strerror(errno))); close(s); return False; } fd_listenset[0] = s; FD_SET(s,&listen_set); } /* now accept incoming connections - forking a new process for each incoming connection */ DEBUG(2,("waiting for a connection\n")); while (1) { fd_set lfds; int num; memcpy((char *)&lfds, (char *)&listen_set, sizeof(listen_set)); num = sys_select(FD_SETSIZE,&lfds,NULL); if (num == -1 && errno == EINTR) continue; /* check if we need to reload services */ check_reload(time(NULL)); /* Find the sockets that are read-ready - accept on these. */ for( ; num > 0; num--) { struct sockaddr addr; int in_addrlen = sizeof(addr); s = -1; for(i = 0; i < num_interfaces; i++) { if(FD_ISSET(fd_listenset[i],&lfds)) { s = fd_listenset[i]; /* Clear this so we don't look at it again. */ FD_CLR(fd_listenset[i],&lfds); break; } } smbd_set_server_fd(accept(s,&addr,&in_addrlen)); if (smbd_server_fd() == -1 && errno == EINTR) continue; if (smbd_server_fd() == -1) { DEBUG(0,("open_sockets: accept: %s\n", strerror(errno))); continue; } if (smbd_server_fd() != -1 && fork()==0) { /* Child code ... */ /* close the listening socket(s) */ for(i = 0; i < num_interfaces; i++) close(fd_listenset[i]); /* close our standard file descriptors */ close_low_fds(); am_parent = 0; set_socket_options(smbd_server_fd(),"SO_KEEPALIVE"); set_socket_options(smbd_server_fd(),user_socket_options); /* Reset global variables in util.c so that client substitutions will be done correctly in the process. */ reset_globals_after_fork(); /* * Ensure this child has kernel oplock * capabilities, but not it's children. */ set_process_capability(KERNEL_OPLOCK_CAPABILITY, True); set_inherited_process_capability(KERNEL_OPLOCK_CAPABILITY, False); return True; } /* The parent doesn't need this socket */ close(smbd_server_fd()); /* Force parent to check log size after * spawning child. Fix from * klausr@ITAP.Physik.Uni-Stuttgart.De. The * parent smbd will log to logserver.smb. It * writes only two messages for each child * started/finished. But each child writes, * say, 50 messages also in logserver.smb, * begining with the debug_count of the * parent, before the child opens its own log * file logserver.client. In a worst case * scenario the size of logserver.smb would be * checked after about 50*50=2500 messages * (ca. 100kb). * */ force_check_log_size(); } /* end for num */ } /* end while 1 */ /* NOTREACHED return True; */ } /**************************************************************************** reload the services file **************************************************************************/ BOOL reload_services(BOOL test) { BOOL ret; if (lp_loaded()) { pstring fname; pstrcpy(fname,lp_configfile()); if (file_exist(fname,NULL) && !strcsequal(fname,servicesf)) { pstrcpy(servicesf,fname); test = False; } } reopen_logs(); if (test && !lp_file_list_changed()) return(True); lp_killunused(conn_snum_used); ret = lp_load(servicesf,False,False,True); #ifdef MS_DFS /* load the dfs maps of all the services having a dfs_map parameter we don't want to do this in lp_load because we want just the smbd server to load up the dfs maps into msdfs.tdb. not nmbd, swat etc*/ load_dfsmaps(); #endif load_printers(); /* perhaps the config filename is now set */ if (!test) reload_services(True); reopen_logs(); load_interfaces(); { if (smbd_server_fd() != -1) { set_socket_options(smbd_server_fd(),"SO_KEEPALIVE"); set_socket_options(smbd_server_fd(),user_socket_options); } } reset_mangled_cache(); reset_stat_cache(); /* this forces service parameters to be flushed */ become_service(NULL,True); return(ret); } /**************************************************************************** Catch a sighup. ****************************************************************************/ VOLATILE SIG_ATOMIC_T reload_after_sighup = False; static void sig_hup(int sig) { BlockSignals(True,SIGHUP); DEBUG(0,("Got SIGHUP\n")); /* * Fix from here. * We used to reload in the signal handler - this * is a *BIG* no-no. */ reload_after_sighup = True; BlockSignals(False,SIGHUP); } #if DUMP_CORE /******************************************************************* prepare to dump a core file - carefully! ********************************************************************/ static BOOL dump_core(void) { char *p; pstring dname; pstrcpy(dname,debugf); if ((p=strrchr(dname,'/'))) *p=0; pstrcat(dname,"/corefiles"); mkdir(dname,0700); sys_chown(dname,getuid(),getgid()); chmod(dname,0700); if (chdir(dname)) return(False); umask(~(0700)); #ifdef HAVE_GETRLIMIT #ifdef RLIMIT_CORE { struct rlimit rlp; getrlimit(RLIMIT_CORE, &rlp); rlp.rlim_cur = MAX(4*1024*1024,rlp.rlim_cur); setrlimit(RLIMIT_CORE, &rlp); getrlimit(RLIMIT_CORE, &rlp); DEBUG(3,("Core limits now %d %d\n", (int)rlp.rlim_cur,(int)rlp.rlim_max)); } #endif #endif DEBUG(0,("Dumping core in %s\n",dname)); abort(); return(True); } #endif /**************************************************************************** exit the server ****************************************************************************/ void exit_server(char *reason) { static int firsttime=1; extern char *last_inbuf; if (!firsttime) exit(0); firsttime = 0; unbecome_user(); DEBUG(2,("Closing connections\n")); conn_close_all(); respond_to_all_remaining_local_messages(); #ifdef WITH_DFS if (dcelogin_atmost_once) { dfs_unlogin(); } #endif if (!reason) { int oldlevel = DEBUGLEVEL; DEBUGLEVEL = 10; DEBUG(0,("Last message was %s\n",smb_fn_name(last_message))); if (last_inbuf) show_msg(last_inbuf); DEBUGLEVEL = oldlevel; DEBUG(0,("===============================================================\n")); #if DUMP_CORE if (dump_core()) return; #endif } locking_end(); #ifdef MS_DFS msdfs_end(); #endif DEBUG(3,("Server exit (%s)\n", (reason ? reason : ""))); exit(0); } /**************************************************************************** initialise connect, service and file structs ****************************************************************************/ static void init_structs(void ) { /* * Set the machine NETBIOS name if not already * set from the config file. */ if (!*global_myname) { char *p; fstrcpy( global_myname, myhostname() ); p = strchr( global_myname, '.' ); if (p) *p = 0; } strupper( global_myname ); conn_init(); file_init(); /* for RPC pipes */ init_rpc_pipe_hnd(); /* for LSA handles */ init_lsa_policy_hnd(); /* for SPOOLSS handles */ init_printer_hnd(); init_dptrs(); } /**************************************************************************** usage on the program ****************************************************************************/ static void usage(char *pname) { printf("Usage: %s [-DaoPh?V] [-d debuglevel] [-l log basename] [-p port]\n", pname); printf(" [-O socket options] [-s services file]\n"); printf("\t-D Become a daemon\n"); printf("\t-a Append to log file (default)\n"); printf("\t-o Overwrite log file, don't append\n"); printf("\t-h Print usage\n"); printf("\t-? Print usage\n"); printf("\t-V Print version\n"); printf("\t-d debuglevel Set the debuglevel\n"); printf("\t-l log basename. Basename for log/debug files\n"); printf("\t-p port Listen on the specified port\n"); printf("\t-O socket options Socket options\n"); printf("\t-s services file. Filename of services file\n"); printf("\n"); } /**************************************************************************** main program ****************************************************************************/ int main(int argc,char *argv[]) { extern BOOL append_log; /* shall I run as a daemon */ BOOL is_daemon = False; BOOL specified_logfile = False; int port = SMB_PORT; int opt; extern char *optarg; #ifdef HAVE_SET_AUTH_PARAMETERS set_auth_parameters(argc,argv); #endif /* this is for people who can't start the program correctly */ while (argc > 1 && (*argv[1] != '-')) { argv++; argc--; } while ( EOF != (opt = getopt(argc, argv, "O:l:s:d:Dp:h?Vaof:")) ) switch (opt) { case 'O': pstrcpy(user_socket_options,optarg); break; case 's': pstrcpy(servicesf,optarg); break; case 'l': specified_logfile = True; pstrcpy(debugf,optarg); break; case 'a': append_log = True; break; case 'o': append_log = False; break; case 'D': is_daemon = True; break; case 'd': if (*optarg == 'A') DEBUGLEVEL = 10000; else DEBUGLEVEL = atoi(optarg); break; case 'p': port = atoi(optarg); break; case 'h': case '?': usage(argv[0]); exit(0); break; case 'V': printf("Version %s\n",VERSION); exit(0); break; default: DEBUG(0,("Incorrect program usage - are you sure the command line is correct?\n")); usage(argv[0]); exit(1); } #ifdef HAVE_SETLUID /* needed for SecureWare on SCO */ setluid(0); #endif /* * gain_root_privilege uses an assert than will cause a core * dump if euid != 0. Ensure this is the case. */ if(geteuid() != (uid_t)0) { fprintf(stderr, "%s: Version %s : Must have effective user id of zero to run.\n", argv[0], VERSION); exit(1); } append_log = True; TimeInit(); if(!specified_logfile) pstrcpy(debugf,SMBLOGFILE); pstrcpy(remote_machine, "smb"); setup_logging(argv[0],False); charset_initialise(); /* we want to re-seed early to prevent time delays causing client problems at a later date. (tridge) */ generate_random_buffer(NULL, 0, False); /* make absolutely sure we run as root - to handle cases where people are crazy enough to have it setuid */ gain_root_privilege(); gain_root_group_privilege(); fault_setup((void (*)(void *))exit_server); CatchSignal(SIGTERM , SIGNAL_CAST dflt_sig); /* we are never interested in SIGPIPE */ BlockSignals(True,SIGPIPE); #if defined(SIGFPE) /* we are never interested in SIGFPE */ BlockSignals(True,SIGFPE); #endif /* we want total control over the permissions on created files, so set our umask to 0 */ umask(0); dos_GetWd(OriginalDir); init_uid(); reopen_logs(); DEBUG(1,( "smbd version %s started.\n", VERSION)); DEBUGADD(1,( "Copyright Andrew Tridgell 1992-1998\n")); DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n", (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid())); if (sizeof(uint16) < 2 || sizeof(uint32) < 4) { DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n")); exit(1); } /* * Do this before reload_services. */ if (!reload_services(False)) return(-1); init_structs(); #ifdef WITH_PROFILE if (!profile_setup(False)) { DEBUG(0,("ERROR: failed to setup profiling\n")); return -1; } #endif #ifdef WITH_SSL { extern BOOL sslEnabled; sslEnabled = lp_ssl_enabled(); if(sslEnabled) sslutil_init(True); } #endif /* WITH_SSL */ codepage_initialise(lp_client_code_page()); fstrcpy(global_myworkgroup, lp_workgroup()); CatchSignal(SIGHUP,SIGNAL_CAST sig_hup); /* Setup the signals that allow the debug log level to by dynamically changed. */ /* If we are using the malloc debug code we can't use SIGUSR1 and SIGUSR2 to do debug level changes. */ #if defined(SIGUSR1) CatchSignal( SIGUSR1, SIGNAL_CAST sig_usr1 ); #endif /* SIGUSR1 */ #if defined(SIGUSR2) CatchSignal( SIGUSR2, SIGNAL_CAST sig_usr2 ); #endif /* SIGUSR2 */ DEBUG(3,( "loaded services\n")); if (!is_daemon && !is_a_socket(0)) { DEBUG(0,("standard input is not a socket, assuming -D option\n")); is_daemon = True; } if (is_daemon) { DEBUG( 3, ( "Becoming a daemon.\n" ) ); become_daemon(); } check_kernel_oplocks(); if (!directory_exist(lp_lockdir(), NULL)) { mkdir(lp_lockdir(), 0755); } if (is_daemon) { pidfile_create("smbd"); } if (!open_sockets(is_daemon,port)) exit(1); /* * Note that this call should be done after the fork() call * in open_sockets(), as some versions of the locking shared * memory code register openers in a flat file. */ if (!locking_init(0)) exit(1); if (!print_backend_init()) { exit(1); } if(!initialize_password_db()) exit(1); /* possibly reload the services file. */ reload_services(True); if(!pdb_generate_sam_sid()) { DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n")); exit(1); } if (*lp_rootdir()) { if (sys_chroot(lp_rootdir()) == 0) DEBUG(2,("Changed root to %s\n", lp_rootdir())); } /* Setup the oplock IPC socket. */ if( !open_oplock_ipc() ) exit(1); smbd_process(); exit_server("normal exit"); return(0); }