X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/254f38d1c5ada5e4df0bccb385dc466549620c71..847a015ae17b3fa66154088009803636f95b2c6f:/src/src/daemon.c diff --git a/src/src/daemon.c b/src/src/daemon.c index 4addf0ac7..61371f592 100644 --- a/src/src/daemon.c +++ b/src/src/daemon.c @@ -31,6 +31,7 @@ static smtp_slot empty_smtp_slot = { .pid = 0, .host_address = NULL }; static SIGNAL_BOOL sigchld_seen; static SIGNAL_BOOL sighup_seen; +static SIGNAL_BOOL sigterm_seen; static int accept_retry_count = 0; static int accept_retry_errno; @@ -87,6 +88,16 @@ sigchld_seen = TRUE; } +/* SIGTERM handler. Try to get the damon pif file removed +before exiting. */ + +static void +main_sigterm_handler(int sig) +{ +sigterm_seen = TRUE; +} + + /************************************************* @@ -146,7 +157,7 @@ int max_for_this_host = 0; int save_log_selector = *log_selector; gstring * whofrom; -void *reset_point = store_get(0); +rmark reset_point = store_mark(); /* Make the address available in ASCII representation, and also fish out the remote port. */ @@ -395,7 +406,7 @@ if (pid == 0) "please try again later.\r\n", FALSE); mac_smtp_fflush(); search_tidyup(); - _exit(EXIT_FAILURE); + exim_underbar_exit(EXIT_FAILURE); } } else if (*nah) smtp_active_hostname = nah; @@ -430,6 +441,7 @@ if (pid == 0) #else signal(SIGCHLD, SIG_IGN); #endif + signal(SIGTERM, SIG_DFL); /* Attempt to get an id from the sending machine via the RFC 1413 protocol. We do this in the sub-process in order not to hold up the @@ -481,14 +493,14 @@ if (pid == 0) { mac_smtp_fflush(); search_tidyup(); - _exit(EXIT_SUCCESS); + exim_underbar_exit(EXIT_SUCCESS); } for (;;) { int rc; message_id[0] = 0; /* Clear out any previous message_id */ - reset_point = store_get(0); /* Save current store high water point */ + reset_point = store_mark(); /* Save current store high water point */ DEBUG(D_any) debug_printf("Process %d is ready for new message\n", (int)getpid()); @@ -509,7 +521,7 @@ if (pid == 0) cancel_cutthrough_connection(TRUE, US"receive dropped"); mac_smtp_fflush(); smtp_log_no_mail(); /* Log no mail if configured */ - _exit(EXIT_SUCCESS); + exim_underbar_exit(EXIT_SUCCESS); } if (message_id[0] == 0) continue; /* No message was accepted */ } @@ -532,7 +544,7 @@ if (pid == 0) /*XXX should we pause briefly, hoping that the client will be the active TCP closer hence get the TCP_WAIT endpoint? */ DEBUG(D_receive) debug_printf("SMTP>>(close on process exit)\n"); - _exit(rc ? EXIT_FAILURE : EXIT_SUCCESS); + exim_underbar_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS); } /* Show the recipients when debugging */ @@ -565,6 +577,7 @@ if (pid == 0) int r = receive_messagecount; BOOL q = f.queue_only_policy; smtp_reset(reset_point); + reset_point = NULL; f.queue_only_policy = q; receive_messagecount = r; } @@ -645,7 +658,7 @@ if (pid == 0) /* Don't ever molest the parent's SSL connection, but do clean up the data structures if necessary. */ -#ifdef SUPPORT_TLS +#ifndef DISABLE_TLS tls_close(NULL, TLS_NO_SHUTDOWN); #endif @@ -653,6 +666,7 @@ if (pid == 0) signal(SIGHUP, SIG_DFL); signal(SIGCHLD, SIG_DFL); + signal(SIGTERM, SIG_DFL); if (geteuid() != root_uid && !deliver_drop_privilege) { @@ -665,7 +679,7 @@ if (pid == 0) (void) deliver_message(message_id, FALSE, FALSE); search_tidyup(); - _exit(EXIT_SUCCESS); + exim_underbar_exit(EXIT_SUCCESS); } if (dpid > 0) @@ -696,13 +710,14 @@ else if (smtp_slots[i].pid <= 0) { smtp_slots[i].pid = pid; - if (smtp_accept_max_per_host != NULL) + /* Connection closes come asyncronously, so we cannot stack this store */ + if (smtp_accept_max_per_host) smtp_slots[i].host_address = string_copy_malloc(sender_host_address); smtp_accept_count++; break; } DEBUG(D_any) debug_printf("%d SMTP accept process%s running\n", - smtp_accept_count, (smtp_accept_count == 1)? "" : "es"); + smtp_accept_count, smtp_accept_count == 1 ? "" : "es"); } /* Get here via goto in error cases */ @@ -833,7 +848,6 @@ pid_t pid; while ((pid = waitpid(-1, &status, WNOHANG)) > 0) { - int i; DEBUG(D_any) { debug_printf("child %d ended: status=0x%x\n", (int)pid, status); @@ -851,6 +865,7 @@ while ((pid = waitpid(-1, &status, WNOHANG)) > 0) if (smtp_slots) { + int i; for (i = 0; i < smtp_accept_max; i++) if (smtp_slots[i].pid == pid) { @@ -871,7 +886,7 @@ while ((pid = waitpid(-1, &status, WNOHANG)) > 0) if (queue_pid_slots) { int max = atoi(CS expand_string(queue_run_max)); - for (i = 0; i < max; i++) + for (int i = 0; i < max; i++) if (queue_pid_slots[i] == pid) { queue_pid_slots[i] = 0; @@ -886,6 +901,77 @@ while ((pid = waitpid(-1, &status, WNOHANG)) > 0) +static void +set_pid_file_path(void) +{ +if (override_pid_file_path) + pid_file_path = override_pid_file_path; + +if (!*pid_file_path) + pid_file_path = string_sprintf("%s/exim-daemon.pid", spool_directory); +} + + +/* Remove the daemon's pidfile. Note: runs with root privilege, +as a direct child of the daemon. Does not return. */ + +void +delete_pid_file(void) +{ +uschar * daemon_pid = string_sprintf("%d\n", (int)getppid()); +FILE * f; + +set_pid_file_path(); +if ((f = Ufopen(pid_file_path, "rb"))) + { + if ( fgets(CS big_buffer, big_buffer_size, f) + && Ustrcmp(daemon_pid, big_buffer) == 0 + ) + if (Uunlink(pid_file_path) == 0) + { + DEBUG(D_any) + debug_printf("%s unlink: %s\n", pid_file_path, strerror(errno)); + } + else + DEBUG(D_any) + debug_printf("unlinked %s\n", pid_file_path); + fclose(f); + } +else + DEBUG(D_any) + debug_printf("%s\n", string_open_failed(errno, "pid file %s", + pid_file_path)); +exim_exit(EXIT_SUCCESS, US"pid file remover"); +} + + +/* Called by the daemon; exec a child to get the pid file deleted +since we may require privs for the containing directory */ + +static void +daemon_die(void) +{ +int pid; + +if (f.running_in_test_harness || write_pid) + { + if ((pid = fork()) == 0) + { + if (override_pid_file_path) + (void)child_exec_exim(CEE_EXEC_PANIC, FALSE, NULL, FALSE, 3, + "-oP", override_pid_file_path, "-oPX"); + else + (void)child_exec_exim(CEE_EXEC_PANIC, FALSE, NULL, FALSE, 1, "-oPX"); + + /* Control never returns here. */ + } + if (pid > 0) + child_close(pid, 1); + } +exim_exit(EXIT_SUCCESS, US"daemon"); +} + + /************************************************* * Exim Daemon Mainline * *************************************************/ @@ -927,7 +1013,7 @@ DEBUG(D_any|D_v) debug_selector |= D_pid; if (f.inetd_wait_mode) { listen_socket_count = 1; - listen_sockets = store_get(sizeof(int)); + listen_sockets = store_get(sizeof(int), FALSE); (void) close(3); if (dup2(0, 3) == -1) log_write(0, LOG_MAIN|LOG_PANIC_DIE, @@ -1066,19 +1152,14 @@ if (f.daemon_listen && !f.inetd_wait_mode) gstring * new_smtp_port = NULL; gstring * new_local_interfaces = NULL; - if (override_pid_file_path == NULL) write_pid = FALSE; + if (!override_pid_file_path) write_pid = FALSE; list = override_local_interfaces; sep = 0; while ((s = string_nextinlist(&list, &sep, big_buffer, big_buffer_size))) { uschar joinstr[4]; - gstring ** gp; - - if (Ustrpbrk(s, ".:") == NULL) - gp = &new_smtp_port; - else - gp = &new_local_interfaces; + gstring ** gp = Ustrpbrk(s, ".:") ? &new_local_interfaces : &new_smtp_port; if (!*gp) { @@ -1115,7 +1196,7 @@ if (f.daemon_listen && !f.inetd_wait_mode) sep = 0; while ((s = string_nextinlist(&list, &sep, big_buffer, big_buffer_size))) pct++; - default_smtp_port = store_get((pct+1) * sizeof(int)); + default_smtp_port = store_get((pct+1) * sizeof(int), FALSE); list = daemon_smtp_port; sep = 0; for (pct = 0; @@ -1203,7 +1284,7 @@ if (f.daemon_listen && !f.inetd_wait_mode) ipa->port = default_smtp_port[0]; for (int i = 1; default_smtp_port[i] > 0; i++) { - ip_address_item *new = store_get(sizeof(ip_address_item)); + ip_address_item *new = store_get(sizeof(ip_address_item), FALSE); memcpy(new->address, ipa->address, Ustrlen(ipa->address) + 1); new->port = default_smtp_port[i]; @@ -1261,7 +1342,7 @@ if (f.daemon_listen && !f.inetd_wait_mode) for (ipa = addresses; ipa; ipa = ipa->next) listen_socket_count++; - listen_sockets = store_get(sizeof(int) * listen_socket_count); + listen_sockets = store_get(sizeof(int) * listen_socket_count, FALSE); } /* daemon_listen but not inetd_wait_mode */ @@ -1284,7 +1365,7 @@ if (f.daemon_listen) if (smtp_accept_max > 0) { - smtp_slots = store_get(smtp_accept_max * sizeof(smtp_slot)); + smtp_slots = store_get(smtp_accept_max * sizeof(smtp_slot), FALSE); for (int i = 0; i < smtp_accept_max; i++) smtp_slots[i] = empty_smtp_slot; } } @@ -1536,12 +1617,7 @@ if (f.running_in_test_harness || write_pid) { FILE *f; - if (override_pid_file_path) - pid_file_path = override_pid_file_path; - - if (pid_file_path[0] == 0) - pid_file_path = string_sprintf("%s/exim-daemon.pid", spool_directory); - + set_pid_file_path(); if ((f = modefopen(pid_file_path, "wb", 0644))) { (void)fprintf(f, "%d\n", (int)getpid()); @@ -1572,23 +1648,27 @@ coming from Exim, not whoever started the daemon. */ originator_uid = exim_uid; originator_gid = exim_gid; -originator_login = ((pw = getpwuid(exim_uid)) != NULL)? - string_copy_malloc(US pw->pw_name) : US"exim"; +originator_login = (pw = getpwuid(exim_uid)) + ? string_copy_perm(US pw->pw_name, FALSE) : US"exim"; /* Get somewhere to keep the list of queue-runner pids if we are keeping track of them (and also if we are doing queue runs). */ if (queue_interval > 0 && local_queue_run_max > 0) { - queue_pid_slots = store_get(local_queue_run_max * sizeof(pid_t)); + queue_pid_slots = store_get(local_queue_run_max * sizeof(pid_t), FALSE); for (int i = 0; i < local_queue_run_max; i++) queue_pid_slots[i] = 0; } -/* Set up the handler for termination of child processes. */ +/* Set up the handler for termination of child processes, and the one +telling us to die. */ sigchld_seen = FALSE; os_non_restarting_signal(SIGCHLD, main_sigchld_handler); +sigterm_seen = FALSE; +os_non_restarting_signal(SIGTERM, main_sigterm_handler); + /* If we are to run the queue periodically, pretend the alarm has just gone off. This will cause the first queue-runner to get kicked off straight away. */ @@ -1738,10 +1818,27 @@ else (eg: compile regex) */ dns_pattern_init(); +smtp_deliver_init(); /* Used for callouts */ + +#ifndef DISABLE_DKIM + { +# ifdef MEASURE_TIMING + struct timeval t0; + gettimeofday(&t0, NULL); +# endif + dkim_exim_init(); +# ifdef MEASURE_TIMING + report_time_since(&t0, US"dkim_exim_init (delta)"); +# endif + } +#endif #ifdef WITH_CONTENT_SCAN malware_init(); #endif +#ifdef SUPPORT_SPF +spf_init(); +#endif /* Close the log so it can be renamed and moved. In the few cases below where this long-running process writes to the log (always exceptional conditions), it @@ -1755,6 +1852,10 @@ DEBUG(D_any) debug_print_ids(US"daemon running with"); smtp_input = TRUE; +#ifdef MEASURE_TIMING +report_time_since(×tamp_startup, US"daemon loop start"); /* testcase 0022 */ +#endif + /* Enter the never-ending loop... */ for (;;) @@ -1768,6 +1869,9 @@ for (;;) EXIM_SOCKLEN_T len; pid_t pid; + if (sigterm_seen) + daemon_die(); /* Does not return */ + /* This code is placed first in the loop, so that it gets obeyed at the start, before the first wait, for the queue-runner case, so that the first one can be started immediately. @@ -1845,6 +1949,7 @@ for (;;) signal(SIGHUP, SIG_DFL); signal(SIGCHLD, SIG_DFL); + signal(SIGTERM, SIG_DFL); /* Re-exec if privilege has been given up, unless deliver_drop_ privilege is set. Reset SIGALRM before exec(). */ @@ -1895,7 +2000,7 @@ for (;;) /* No need to re-exec; SIGALRM remains set to the default handler */ queue_run(NULL, NULL, FALSE); - _exit(EXIT_SUCCESS); + exim_underbar_exit(EXIT_SUCCESS); } if (pid < 0) @@ -1985,6 +2090,11 @@ for (;;) handle_ending_processes(); errno = select_errno; +#ifndef DISABLE_TLS + /* Create or rotate any required keys */ + tls_daemon_init(); +#endif + /* Loop for all the sockets that are currently ready to go. If select actually failed, we have set the count to 1 and select_failed=TRUE, so as to use the common error code for select/accept below. */