/* Unix SMB/CIFS implementation. Main SMB server routines Copyright (C) Andrew Tridgell 1992-1998 Copyright (C) Martin Pool 2002 Copyright (C) Jelmer Vernooij 2002-2003 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" static_decl_rpc; static 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 struct auth_context *negprot_global_auth_context; extern pstring user_socket_options; extern SIG_ATOMIC_T got_sig_term; extern SIG_ATOMIC_T reload_after_sighup; static SIG_ATOMIC_T got_sig_cld; #ifdef WITH_DFS extern int dcelogin_atmost_once; #endif /* WITH_DFS */ /* 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); } /******************************************************************* What to do when smb.conf is updated. ********************************************************************/ static void smb_conf_updated(int msg_type, struct process_id src, void *buf, size_t len) { DEBUG(10,("smb_conf_updated: Got message saying smb.conf was updated. Reloading.\n")); reload_services(False); } /**************************************************************************** Terminate signal. ****************************************************************************/ static void sig_term(void) { got_sig_term = 1; sys_select_signal(SIGTERM); } /**************************************************************************** Catch a sighup. ****************************************************************************/ static void sig_hup(int sig) { reload_after_sighup = 1; sys_select_signal(SIGHUP); } /**************************************************************************** Catch a sigcld ****************************************************************************/ static void sig_cld(int sig) { got_sig_cld = 1; sys_select_signal(SIGCLD); } /**************************************************************************** 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), struct process_id 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, struct process_id 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, struct process_id src, void *buf, size_t len) { DEBUG(3, ("got a SHUTDOWN message\n")); exit_server_cleanly(NULL); } #ifdef DEVELOPER static void msg_inject_fault(int msg_type, struct process_id src, void *buf, size_t len) { int sig; if (len != sizeof(int)) { DEBUG(0, ("Process %llu sent bogus signal injection request\n", (unsigned long long)src.pid)); return; } sig = *(int *)buf; if (sig == -1) { exit_server("internal error injected"); return; } #if HAVE_STRSIGNAL DEBUG(0, ("Process %llu requested injection of signal %d (%s)\n", (unsigned long long)src.pid, sig, strsignal(sig))); #else DEBUG(0, ("Process %llu requested injection of signal %d\n", (unsigned long long)src.pid, sig)); #endif kill(sys_getpid(), sig); } #endif /* DEVELOPER */ struct child_pid { struct child_pid *prev, *next; pid_t pid; }; static struct child_pid *children; static int num_children; static void add_child_pid(pid_t pid) { struct child_pid *child; if (lp_max_smbd_processes() == 0) { /* Don't bother with the child list if we don't care anyway */ return; } child = SMB_MALLOC_P(struct child_pid); if (child == NULL) { DEBUG(0, ("Could not add child struct -- malloc failed\n")); return; } child->pid = pid; DLIST_ADD(children, child); num_children += 1; } static void remove_child_pid(pid_t pid) { struct child_pid *child; if (lp_max_smbd_processes() == 0) { /* Don't bother with the child list if we don't care anyway */ return; } for (child = children; child != NULL; child = child->next) { if (child->pid == pid) { struct child_pid *tmp = child; DLIST_REMOVE(children, child); SAFE_FREE(tmp); num_children -= 1; return; } } DEBUG(0, ("Could not find child %d -- ignoring\n", (int)pid)); } /**************************************************************************** Have we reached the process limit ? ****************************************************************************/ static BOOL allowable_number_of_smbd_processes(void) { int max_processes = lp_max_smbd_processes(); if (!max_processes) return True; return num_children < max_processes; } /**************************************************************************** Open the socket communication. ****************************************************************************/ static BOOL open_sockets_smbd(BOOL is_daemon, BOOL interactive, const char *smb_ports) { int num_interfaces = iface_count(); int num_sockets = 0; int fd_listenset[FD_SETSIZE]; fd_set listen_set; int s; int maxfd = 0; int i; char *ports; 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 */ CatchSignal(SIGCLD, sig_cld); FD_ZERO(&listen_set); /* use a reasonable default set of ports - listing on 445 and 139 */ if (!smb_ports) { ports = lp_smb_ports(); if (!ports || !*ports) { ports = smb_xstrdup(SMB_PORTS); } else { ports = smb_xstrdup(ports); } } else { ports = smb_xstrdup(smb_ports); } 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. */ /* 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); fstring tok; const char *ptr; if(ifip == NULL) { DEBUG(0,("open_sockets_smbd: interface %d has NULL IP address !\n", i)); continue; } for (ptr=ports; next_token(&ptr, tok, " \t,", sizeof(tok)); ) { unsigned port = atoi(tok); if (port == 0) { continue; } s = fd_listenset[num_sockets] = 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); /* Set server socket to non-blocking for the accept. */ set_blocking(s,False); if (listen(s, SMBD_LISTEN_BACKLOG) == -1) { DEBUG(0,("listen: %s\n",strerror(errno))); close(s); return False; } FD_SET(s,&listen_set); maxfd = MAX( maxfd, s); num_sockets++; if (num_sockets >= FD_SETSIZE) { DEBUG(0,("open_sockets_smbd: Too many sockets to bind to\n")); return False; } } } } else { /* Just bind to 0.0.0.0 - accept connections from anywhere. */ fstring tok; const char *ptr; num_interfaces = 1; for (ptr=ports; next_token(&ptr, tok, " \t,", sizeof(tok)); ) { unsigned port = atoi(tok); if (port == 0) continue; /* 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); /* Set server socket to non-blocking for the accept. */ set_blocking(s,False); if (listen(s, SMBD_LISTEN_BACKLOG) == -1) { DEBUG(0,("open_sockets_smbd: listen: %s\n", strerror(errno))); close(s); return False; } fd_listenset[num_sockets] = s; FD_SET(s,&listen_set); maxfd = MAX( maxfd, s); num_sockets++; if (num_sockets >= FD_SETSIZE) { DEBUG(0,("open_sockets_smbd: Too many sockets to bind to\n")); return False; } } } SAFE_FREE(ports); /* 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); message_register(MSG_SMB_FILE_RENAME, msg_file_was_renamed); message_register(MSG_SMB_CONF_UPDATED, smb_conf_updated); #ifdef DEVELOPER message_register(MSG_SMB_INJECT_FAULT, msg_inject_fault); #endif /* 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(); if (got_sig_cld) { pid_t pid; got_sig_cld = False; while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) { remove_child_pid(pid); } } memcpy((char *)&lfds, (char *)&listen_set, sizeof(listen_set)); num = sys_select(maxfd+1,&lfds,NULL,NULL,NULL); if (num == -1 && errno == EINTR) { if (got_sig_term) { exit_server_cleanly(NULL); } /* 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); pid_t child = 0; s = -1; for(i = 0; i < num_sockets; 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; } /* Ensure child is set to blocking mode */ set_blocking(smbd_server_fd(),True); if (smbd_server_fd() != -1 && interactive) return True; if (allowable_number_of_smbd_processes() && smbd_server_fd() != -1 && ((child = sys_fork())==0)) { /* Child code ... */ /* close the listening socket(s) */ for(i = 0; i < num_sockets; 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); /* this is needed so that we get decent entries in smbstatus for port 445 connects */ set_remote_machine_name(get_peer_addr(smbd_server_fd()), False); /* Reset the state of the random * number generation system, so * children do not get the same random * numbers as each other */ set_need_random_reseed(); /* tdb needs special fork handling - remove * CLEAR_IF_FIRST flags */ if (tdb_reopen_all(1) == -1) { DEBUG(0,("tdb_reopen_all failed.\n")); smb_panic("tdb_reopen_all failed."); } 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); if (child != 0) { add_child_pid(child); } /* 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 printers **************************************************************************/ void reload_printers(void) { int snum; int n_services = lp_numservices(); int pnum = lp_servicenumber(PRINTERS_NAME); const char *pname; pcap_cache_reload(); /* remove stale printers */ for (snum = 0; snum < n_services; snum++) { /* avoid removing PRINTERS_NAME or non-autoloaded printers */ if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) && lp_autoloaded(snum))) continue; pname = lp_printername(snum); if (!pcap_printername_ok(pname)) { DEBUG(3, ("removing stale printer %s\n", pname)); if (is_printer_published(NULL, snum, NULL)) nt_printer_publish(NULL, snum, SPOOL_DS_UNPUBLISH); del_a_printer(pname); lp_killservice(snum); } } load_printers(); } /**************************************************************************** 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, True); reload_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,0,True); return(ret); } /**************************************************************************** Exit the server. ****************************************************************************/ /* Reasons for shutting down a server process. */ enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL }; static void exit_server_common(enum server_exit_reason how, const char *const reason) NORETURN_ATTRIBUTE; static void exit_server_common(enum server_exit_reason how, const char *const reason) { static int firsttime=1; if (!firsttime) exit(0); firsttime = 0; change_to_root_user(); if (negprot_global_auth_context) { (negprot_global_auth_context->free)(&negprot_global_auth_context); } conn_close_all(); invalidate_all_vuids(); print_notify_send_messages(3); /* 3 second timeout. */ /* delete our entry in the connections database. */ yield_connection(NULL,""); respond_to_all_remaining_local_messages(); #ifdef WITH_DFS if (dcelogin_atmost_once) { dfs_unlogin(); } #endif locking_end(); printing_end(); if (how != SERVER_EXIT_NORMAL) { int oldlevel = DEBUGLEVEL; char *last_inbuf = get_InBuffer(); DEBUGLEVEL = 10; DEBUGSEP(0); DEBUG(0,("Abnormal server exit: %s\n", reason ? reason : "no explanation provided")); DEBUGSEP(0); log_stack_trace(); if (last_inbuf) { DEBUG(0,("Last message was %s\n", LAST_MESSAGE())); show_msg(last_inbuf); } DEBUGLEVEL = oldlevel; #if DUMP_CORE dump_core(); #endif } else { DEBUG(3,("Server exit (%s)\n", (reason ? reason : "normal exit"))); } exit(0); } void exit_server(const char *const explanation) { exit_server_common(SERVER_EXIT_ABNORMAL, explanation); } void exit_server_cleanly(const char *const explanation) { exit_server_common(SERVER_EXIT_NORMAL, explanation); } void exit_server_fault(void) { exit_server("critical server fault"); } /**************************************************************************** Initialise connect, service and file structs. ****************************************************************************/ static BOOL init_structs(void ) { /* * Set the machine NETBIOS name if not already * set from the config file. */ if (!init_names()) return False; conn_init(); file_init(); /* for RPC pipes */ init_rpc_pipe_hnd(); init_dptrs(); secrets_init(); return True; } /**************************************************************************** main program. ****************************************************************************/ /* Declare prototype for build_options() to avoid having to run it through mkproto.h. Mixing $(builddir) and $(srcdir) source files in the current prototype generation system is too complicated. */ void build_options(BOOL screen); int main(int argc,const char *argv[]) { /* shall I run as a daemon */ static BOOL is_daemon = False; static BOOL interactive = False; static BOOL Fork = True; static BOOL no_process_group = False; static BOOL log_stdout = False; static char *ports = NULL; int opt; poptContext pc; struct poptOption long_options[] = { POPT_AUTOHELP {"daemon", 'D', POPT_ARG_VAL, &is_daemon, True, "Become a daemon (default)" }, {"interactive", 'i', POPT_ARG_VAL, &interactive, True, "Run interactive (not a daemon)"}, {"foreground", 'F', POPT_ARG_VAL, &Fork, False, "Run daemon in foreground (for daemontools, etc.)" }, {"no-process-group", '\0', POPT_ARG_VAL, &no_process_group, True, "Don't create a new process group" }, {"log-stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" }, {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" }, {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"}, POPT_COMMON_SAMBA POPT_COMMON_DYNCONFIG POPT_TABLEEND }; load_case_tables(); #ifdef HAVE_SET_AUTH_PARAMETERS set_auth_parameters(argc,argv); #endif pc = poptGetContext("smbd", argc, argv, long_options, 0); while((opt = poptGetNextOpt(pc)) != -1) { switch (opt) { case 'b': build_options(True); /* Display output to screen as well as debug */ exit(0); break; } } poptFreeContext(pc); #ifdef HAVE_SETLUID /* needed for SecureWare on SCO */ setluid(0); #endif sec_init(); set_remote_machine_name("smbd", False); if (interactive) { Fork = False; log_stdout = True; } if (interactive && (DEBUGLEVEL >= 9)) { talloc_enable_leak_report(); } if (log_stdout && Fork) { DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n")); exit(1); } setup_logging(argv[0],log_stdout); /* we want to re-seed early to prevent time delays causing client problems at a later date. (tridge) */ generate_random_buffer(NULL, 0); /* 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_fault); dump_core_setup("smbd"); 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", SAMBA_VERSION_STRING)); DEBUGADD( 0, ( "%s\n", COPYRIGHT_STARTUP_MESSAGE ) ); 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(); #ifdef WITH_PROFILE if (!profile_setup(False)) { DEBUG(0,("ERROR: failed to setup profiling\n")); return -1; } #endif 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(Fork, no_process_group); } #if HAVE_SETPGID /* * If we're interactive we want to set our own process group for * signal management. */ if (interactive && !no_process_group) setpgid( (pid_t)0, (pid_t)0); #endif if (!directory_exist(lp_lockdir(), NULL)) mkdir(lp_lockdir(), 0755); if (is_daemon) pidfile_create("smbd"); /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */ if (!message_init()) exit(1); /* Initialise the password backed before the global_sam_sid to ensure that we fetch from ldap before we make a domain sid up */ if(!initialize_password_db(False)) exit(1); if (!secrets_init()) { DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n")); exit(1); } if(!get_global_sam_sid()) { DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n")); exit(1); } if (!session_init()) exit(1); if (conn_tdb_ctx() == NULL) exit(1); if (!locking_init(0)) exit(1); namecache_enable(); if (!init_registry()) exit(1); #if 0 if (!init_svcctl_db()) exit(1); #endif if (!print_backend_init()) exit(1); if (!init_guest_info()) { DEBUG(0,("ERROR: failed to setup guest info.\n")); return -1; } /* Setup the main smbd so that we can get messages. */ /* don't worry about general printing messages here */ claim_connection(NULL,"",0,True,FLAG_MSG_GENERAL|FLAG_MSG_SMBD); /* only start the background queue daemon if we are running as a daemon -- bad things will happen if smbd is launched via inetd and we fork a copy of ourselves here */ if ( is_daemon && !interactive ) start_background_queue(); /* Always attempt to initialize DMAPI. We will only use it later if * lp_dmapi_support is set on the share, but we need a single global * session to work with. */ dmapi_init_session(); if (!open_sockets_smbd(is_daemon, interactive, ports)) exit(1); /* * everything after this point is run after the fork() */ static_init_rpc; init_modules(); /* possibly reload the services file. */ reload_services(True); 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); /* Setup aio signal handler. */ initialize_async_io_handler(); /* re-initialise the timezone */ TimeInit(); /* register our message handlers */ message_register(MSG_SMB_FORCE_TDIS, msg_force_tdis); smbd_process(); namecache_shutdown(); exit_server_cleanly(NULL); return(0); }