/* Unix SMB/CIFS implementation. Main SMB server routines Copyright (C) Andrew Tridgell 1992-1998 Copyright (C) Martin Pool 2002 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" 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 pstring user_socket_options; #ifdef WITH_DFS extern int dcelogin_atmost_once; #endif /* WITH_DFS */ extern fstring remote_machine; /* 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 = -1; int smbd_server_fd(void) { return server_fd; } static void smbd_set_server_fd(int fd) { server_fd = fd; client_setfd(fd); } /**************************************************************************** Terminate signal. ****************************************************************************/ SIG_ATOMIC_T got_sig_term = 0; static void sig_term(void) { got_sig_term = 1; sys_select_signal(); } /**************************************************************************** Catch a sighup. ****************************************************************************/ SIG_ATOMIC_T reload_after_sighup = 0; static void sig_hup(int sig) { reload_after_sighup = 1; sys_select_signal(); } /**************************************************************************** Send a SIGTERM to our process group. *****************************************************************************/ static void killkids(void) { if(am_parent) kill(0,SIGTERM); } /**************************************************************************** Process a sam sync message - not sure whether to do this here or somewhere else. ****************************************************************************/ static void msg_sam_sync(int UNUSED(msg_type), pid_t UNUSED(pid), void *UNUSED(buf), size_t UNUSED(len)) { DEBUG(10, ("** sam sync message received, ignoring\n")); } /**************************************************************************** Process a sam sync replicate message - not sure whether to do this here or somewhere else. ****************************************************************************/ static void msg_sam_repl(int msg_type, pid_t pid, void *buf, size_t len) { uint32 low_serial; if (len != sizeof(uint32)) return; low_serial = *((uint32 *)buf); DEBUG(3, ("received sam replication message, serial = 0x%04x\n", low_serial)); } /**************************************************************************** Open the socket communication - inetd. ****************************************************************************/ 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(False); /* Don't close stderr */ set_socket_options(smbd_server_fd(),"SO_KEEPALIVE"); set_socket_options(smbd_server_fd(), user_socket_options); return True; } static void msg_exit_server(int msg_type, pid_t src, void *buf, size_t len) { exit_server("Got a SHUTDOWN message"); } /**************************************************************************** Open the socket communication. ****************************************************************************/ static BOOL open_sockets_smbd(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_smbd: 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_smbd: 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 */ set_socket_options(s,"SO_KEEPALIVE"); set_socket_options(s,user_socket_options); 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 */ set_socket_options(s,"SO_KEEPALIVE"); set_socket_options(s,user_socket_options); if (listen(s, 5) == -1) { DEBUG(0,("open_sockets_smbd: listen: %s\n", strerror(errno))); close(s); return False; } fd_listenset[0] = s; FD_SET(s,&listen_set); } /* Listen to messages */ message_register(MSG_SMB_SAM_SYNC, msg_sam_sync); message_register(MSG_SMB_SAM_REPL, msg_sam_repl); message_register(MSG_SHUTDOWN, msg_exit_server); /* 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; /* Free up temporary memory from the main smbd. */ lp_talloc_free(); /* Ensure we respond to PING and DEBUG messages from the main smbd. */ message_dispatch(); memcpy((char *)&lfds, (char *)&listen_set, sizeof(listen_set)); num = sys_select(FD_SETSIZE,&lfds,NULL,NULL,NULL); if (num == -1 && errno == EINTR) { if (got_sig_term) { exit_server("Caught TERM signal"); } /* check for sighup processing */ if (reload_after_sighup) { change_to_root_user(); DEBUG(1,("Reloading services after SIGHUP\n")); reload_services(False); reload_after_sighup = 0; } 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; socklen_t 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_smbd: accept: %s\n", strerror(errno))); continue; } if (smbd_server_fd() != -1 && sys_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(False); 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(); /* tdb needs special fork handling */ tdb_reopen_all(); return True; } /* The parent doesn't need this socket */ close(smbd_server_fd()); /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu: Clear the closed fd info out of server_fd -- and more importantly, out of client_fd in util_sock.c, to avoid a possible getpeername failure if we reopen the logs and use %I in the filename. */ smbd_set_server_fd(-1); /* 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, dyn_CONFIGFILE)) { pstrcpy(dyn_CONFIGFILE, fname); test = False; } } reopen_logs(); if (test && !lp_file_list_changed()) return(True); lp_killunused(conn_snum_used); ret = lp_load(dyn_CONFIGFILE, False, False, True); 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); } } mangle_reset_cache(); reset_stat_cache(); /* this forces service parameters to be flushed */ set_current_service(NULL,True); return(ret); } #if DUMP_CORE /******************************************************************* prepare to dump a core file - carefully! ********************************************************************/ static BOOL dump_core(void) { char *p; pstring dname; pstrcpy(dname,lp_logfile()); if ((p=strrchr_m(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 /**************************************************************************** update the current smbd process count ****************************************************************************/ static void decrement_smbd_process_count(void) { int32 total_smbds; if (lp_max_smbd_processes()) { total_smbds = 0; tdb_change_int32_atomic(conn_tdb_ctx(), "INFO/total_smbds", &total_smbds, -1); } } /**************************************************************************** Exit the server. ****************************************************************************/ void exit_server(char *reason) { static int firsttime=1; extern char *last_inbuf; extern struct auth_context *negprot_global_auth_context; if (!firsttime) exit(0); firsttime = 0; change_to_root_user(); DEBUG(2,("Closing connections\n")); if (negprot_global_auth_context) { (negprot_global_auth_context->free)(&negprot_global_auth_context); } conn_close_all(); invalidate_all_vuids(); /* delete our entry in the connections database. */ yield_connection(NULL,""); respond_to_all_remaining_local_messages(); decrement_smbd_process_count(); #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(); printing_end(); 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; pstrcpy( global_myname, myhostname() ); p = strchr_m(global_myname, '.' ); if (p) *p = 0; } strupper(global_myname); conn_init(); file_init(); /* for RPC pipes */ init_rpc_pipe_hnd(); init_dptrs(); secrets_init(); } /**************************************************************************** Usage on the program. ****************************************************************************/ static void usage(char *pname) { d_printf("Usage: %s [-DaioPh?Vb] [-d debuglevel] [-l log basename] [-p port]\n", pname); d_printf(" [-O socket options] [-s services file]\n"); d_printf("\t-D Become a daemon (default)\n"); d_printf("\t-a Append to log file (default)\n"); d_printf("\t-i Run interactive (not a daemon)\n" ); d_printf("\t-o Overwrite log file, don't append\n"); d_printf("\t-h Print usage\n"); d_printf("\t-? Print usage\n"); d_printf("\t-V Print version\n"); d_printf("\t-b Print build options\n"); d_printf("\t-d debuglevel Set the debuglevel\n"); d_printf("\t-l log basename. Basename for log/debug files\n"); d_printf("\t-p port Listen on the specified port\n"); d_printf("\t-O socket options Socket options\n"); d_printf("\t-s services file. Filename of services file\n"); d_printf("\n"); } /**************************************************************************** main program. ****************************************************************************/ int main(int argc,char *argv[]) { extern BOOL append_log; extern BOOL AllowDebugChange; extern char *optarg; /* shall I run as a daemon */ BOOL is_daemon = False; BOOL interactive = False; BOOL specified_logfile = False; int port = SMB_PORT; int opt; pstring logfile; #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?bVaiof:")) ) switch (opt) { case 'O': pstrcpy(user_socket_options,optarg); break; case 's': pstrcpy(dyn_CONFIGFILE,optarg); break; case 'l': specified_logfile = True; pstr_sprintf(logfile, "%s/log.smbd", optarg); lp_set_logfile(logfile); break; case 'a': append_log = True; break; case 'i': interactive = 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); AllowDebugChange = False; break; case 'p': port = atoi(optarg); break; case 'h': case '?': usage(argv[0]); exit(0); break; case 'V': d_printf("Version %s\n",VERSION); exit(0); break; case 'b': build_options(True); /* Display output to screen as well as debug */ 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 sec_init(); load_case_tables(); append_log = True; if(!specified_logfile) { pstr_sprintf(logfile, "%s/log.smbd", dyn_LOGFILEBASE); lp_set_logfile(logfile); } fstrcpy(remote_machine, "smbd"); setup_logging(argv[0],interactive); /* 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 sig_term); CatchSignal(SIGHUP,SIGNAL_CAST sig_hup); /* we are never interested in SIGPIPE */ BlockSignals(True,SIGPIPE); #if defined(SIGFPE) /* we are never interested in SIGFPE */ BlockSignals(True,SIGFPE); #endif #if defined(SIGUSR2) /* We are no longer interested in USR2 */ BlockSignals(True,SIGUSR2); #endif /* POSIX demands that signals are inherited. If the invoking process has * these signals masked, we will have problems, as we won't recieve them. */ BlockSignals(False, SIGHUP); BlockSignals(False, SIGUSR1); BlockSignals(False, SIGTERM); /* we want total control over the permissions on created files, so set our umask to 0 */ umask(0); init_sec_ctx(); reopen_logs(); DEBUG(0,( "smbd version %s started.\n", VERSION)); DEBUGADD(0,( "Copyright Andrew Tridgell and the Samba Team 1992-2002\n")); DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n", (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid())); /* Output the build options to the debug log */ build_options(False); 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(); /* don't call winbind for our domain if we are the DC */ if (lp_domain_logons()) { winbind_exclude_domain(lp_workgroup()); } #ifdef WITH_PROFILE if (!profile_setup(False)) { DEBUG(0,("ERROR: failed to setup profiling\n")); return -1; } #endif fstrcpy(global_myworkgroup, lp_workgroup()); DEBUG(3,( "loaded services\n")); if (!is_daemon && !is_a_socket(0)) { if (!interactive) DEBUG(0,("standard input is not a socket, assuming -D option\n")); /* * Setting is_daemon here prevents us from eventually calling * the open_sockets_inetd() */ is_daemon = True; } if (is_daemon && !interactive) { DEBUG( 3, ( "Becoming a daemon.\n" ) ); become_daemon(); } #if HAVE_SETPGID /* * If we're interactive we want to set our own process group for * signal management. */ if (interactive) setpgid( (pid_t)0, (pid_t)0); #endif if (!directory_exist(lp_lockdir(), NULL)) { mkdir(lp_lockdir(), 0755); } if (is_daemon) { pidfile_create("smbd"); } if (!message_init()) { exit(1); } register_msg_pool_usage(); register_dmalloc_msgs(); /* Setup the main smbd so that we can get messages. */ claim_connection(NULL,"",0,True); /* DO NOT ENABLE THIS TILL YOU COPE WITH KILLING THESE TASKS AND INETD THIS *killed* LOTS OF BUILD FARM MACHINES. IT CREATED HUNDREDS OF smbd PROCESSES THAT NEVER DIE start_background_queue(); */ if (!open_sockets_smbd(is_daemon,port)) exit(1); /* * everything after this point is run after the fork() */ if (!locking_init(0)) exit(1); if (!print_backend_init()) exit(1); if (!share_info_db_init()) exit(1); if (!init_registry()) exit(1); if(!initialize_password_db(False)) exit(1); uni_group_cache_init(); /* Non-critical */ /* possibly reload the services file. */ reload_services(True); if(!get_global_sam_sid()) { DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n")); exit(1); } if (!init_account_policy()) { DEBUG(0,("Could not open account policy tdb.\n")); exit(1); } if (*lp_rootdir()) { if (sys_chroot(lp_rootdir()) == 0) DEBUG(2,("Changed root to %s\n", lp_rootdir())); } /* Setup oplocks */ if (!init_oplocks()) exit(1); /* Setup change notify */ if (!init_change_notify()) exit(1); /* re-initialise the timezone */ TimeInit(); /* register our message handlers */ message_register(MSG_SMB_FORCE_TDIS, msg_force_tdis); talloc_init_named("dummy!"); smbd_process(); uni_group_cache_shutdown(); exit_server("normal exit"); return(0); }