X-Git-Url: https://git.exim.org/users/jgh/exim.git/blobdiff_plain/b536a578fbabdc9d39da53d54a8d7700ba537431..68f71b94cc10f8b0453597d0f92b4bd7d995eeef:/src/src/daemon.c diff --git a/src/src/daemon.c b/src/src/daemon.c index 1a15d46c0..2bed143a1 100644 --- a/src/src/daemon.c +++ b/src/src/daemon.c @@ -3,6 +3,7 @@ *************************************************/ /* Copyright (c) University of Cambridge 1995 - 2018 */ +/* Copyright (c) The Exim Maintainers 2020 */ /* See the file NOTICE for conditions of use and distribution. */ /* Functions concerned with running Exim as a daemon */ @@ -31,6 +32,7 @@ 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 +89,16 @@ 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; +} + + /************************************************* @@ -106,15 +118,27 @@ Returns: nothing static void never_error(uschar *log_msg, uschar *smtp_msg, int was_errno) { -uschar *emsg = (was_errno <= 0)? US"" : - string_sprintf(": %s", strerror(was_errno)); +uschar *emsg = was_errno <= 0 + ? US"" : string_sprintf(": %s", strerror(was_errno)); log_write(0, LOG_MAIN|LOG_PANIC, "%s%s", log_msg, emsg); -if (smtp_out != NULL) smtp_printf("421 %s\r\n", FALSE, smtp_msg); +if (smtp_out) smtp_printf("421 %s\r\n", FALSE, smtp_msg); } +/************************************************* +*************************************************/ + +static void +close_daemon_sockets(int daemon_notifier_fd, + int * listen_sockets, int listen_socket_count) +{ +if (daemon_notifier_fd >= 0) (void) close(daemon_notifier_fd); +for (int i = 0; i < listen_socket_count; i++) (void) close(listen_sockets[i]); +} + + /************************************************* * Handle a connected SMTP call * *************************************************/ @@ -146,7 +170,7 @@ 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. */ @@ -202,11 +226,11 @@ memory is reclaimed. */ whofrom = string_append(NULL, 3, "[", sender_host_address, "]"); if (LOGGING(incoming_port)) - whofrom = string_append(whofrom, 2, ":", string_sprintf("%d", sender_host_port)); + whofrom = string_fmt_append(whofrom, ":%d", sender_host_port); if (LOGGING(incoming_interface)) - whofrom = string_append(whofrom, 4, " I=[", - interface_address, "]:", string_sprintf("%d", interface_port)); + whofrom = string_fmt_append(whofrom, " I=[%s]:%d", + interface_address, interface_port); (void) string_from_gstring(whofrom); /* Terminate the newly-built string */ @@ -282,11 +306,10 @@ count of *other* connections, not including this one. */ if ((max_for_this_host > 0) && (smtp_accept_count >= max_for_this_host)) { - int i; int host_accept_count = 0; int other_host_count = 0; /* keep a count of non matches to optimise */ - for (i = 0; i < smtp_accept_max; ++i) + for (int i = 0; i < smtp_accept_max; ++i) if (smtp_slots[i].host_address) { if (Ustrcmp(sender_host_address, smtp_slots[i].host_address) == 0) @@ -345,13 +368,12 @@ if (LOGGING(smtp_connection)) expansion above did a lookup. */ search_tidyup(); -pid = fork(); +pid = exim_fork(US"daemon-accept"); /* Handle the child process */ if (pid == 0) { - int i; int queue_only_reason = 0; int old_pool = store_pool; int save_debug_selector = debug_selector; @@ -396,7 +418,7 @@ 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; @@ -414,7 +436,7 @@ if (pid == 0) extensive comment before the reception loop in exim.c for a fuller explanation of this logic. */ - for (i = 0; i < listen_socket_count; i++) (void)close(listen_sockets[i]); + close_daemon_sockets(daemon_notifier_fd, listen_sockets, listen_socket_count); /* Set FD_CLOEXEC on the SMTP socket. We don't want any rogue child processes to be able to communicate with them, under any circumstances. */ @@ -431,6 +453,7 @@ 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 @@ -482,14 +505,14 @@ 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()); @@ -510,7 +533,7 @@ 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 */ } @@ -518,13 +541,13 @@ if (pid == 0) { if (smtp_out) { - int i, fd = fileno(smtp_in); + int fd = fileno(smtp_in); uschar buf[128]; mac_smtp_fflush(); /* drain socket, for clean TCP FINs */ if (fcntl(fd, F_SETFL, O_NONBLOCK) == 0) - for(i = 16; read(fd, buf, sizeof(buf)) > 0 && i > 0; ) i--; + for(int i = 16; read(fd, buf, sizeof(buf)) > 0 && i > 0; ) i--; } cancel_cutthrough_connection(TRUE, US"message setup dropped"); search_tidyup(); @@ -533,20 +556,19 @@ 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 */ DEBUG(D_receive) { - int i; if (sender_address) debug_printf("Sender: %s\n", sender_address); if (recipients_list) { debug_printf("Recipients:\n"); - for (i = 0; i < recipients_count; i++) + for (int i = 0; i < recipients_count; i++) debug_printf(" %s\n", recipients_list[i].address); } } @@ -567,6 +589,7 @@ 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; } @@ -629,7 +652,8 @@ if (pid == 0) If we are not root, we have to re-exec exim unless deliveries are being done unprivileged. */ - else if (!f.queue_only_policy && !f.deliver_freeze) + else if ( (!f.queue_only_policy || f.queue_smtp) + && !f.deliver_freeze) { pid_t dpid; @@ -639,7 +663,7 @@ if (pid == 0) mac_smtp_fflush(); - if ((dpid = fork()) == 0) + if ((dpid = exim_fork(US"daemon-accept-delivery")) == 0) { (void)fclose(smtp_in); (void)fclose(smtp_out); @@ -647,7 +671,7 @@ 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 @@ -655,6 +679,7 @@ if (pid == 0) signal(SIGHUP, SIG_DFL); signal(SIGCHLD, SIG_DFL); + signal(SIGTERM, SIG_DFL); if (geteuid() != root_uid && !deliver_drop_privilege) { @@ -667,7 +692,7 @@ if (pid == 0) (void) deliver_message(message_id, FALSE, FALSE); search_tidyup(); - _exit(EXIT_SUCCESS); + exim_underbar_exit(EXIT_SUCCESS); } if (dpid > 0) @@ -694,18 +719,18 @@ if (pid < 0) never_error(US"daemon: accept process fork failed", US"Fork failed", errno); else { - int i; - for (i = 0; i < smtp_accept_max; ++i) + for (int i = 0; i < smtp_accept_max; ++i) 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 */ @@ -836,7 +861,6 @@ 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); @@ -854,6 +878,7 @@ 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) { @@ -874,7 +899,7 @@ 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; @@ -889,6 +914,258 @@ 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); +} + + +/* 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 (daemon_notifier_fd >= 0) + { + close(daemon_notifier_fd); + daemon_notifier_fd = -1; +#ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS + { + uschar * s = expand_string(notifier_socket); + DEBUG(D_any) debug_printf("unlinking notifier socket %s\n", s); + Uunlink(s); + } +#endif + } + +if (f.running_in_test_harness || write_pid) + { + if ((pid = exim_fork(US"daemon-del-pidfile")) == 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); +} + + +/************************************************* +* Listener socket for local work prompts * +*************************************************/ + +static void +daemon_notifier_socket(void) +{ +int fd; +const uschar * where; +struct sockaddr_un sa_un = {.sun_family = AF_UNIX}; +int len; + +if (override_local_interfaces && !override_pid_file_path) + { + DEBUG(D_any) + debug_printf("-oX used without -oP so not creating notifier socket\n"); + return; + } + +DEBUG(D_any) debug_printf("creating notifier socket\n"); + +#ifdef SOCK_CLOEXEC +if ((fd = socket(PF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) + { where = US"socket"; goto bad; } +#else +if ((fd = socket(PF_UNIX, SOCK_DGRAM, 0)) < 0) + { where = US"socket"; goto bad; } +(void)fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC); +#endif + +#ifdef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS +sa_un.sun_path[0] = 0; /* Abstract local socket addr - Linux-specific? */ +len = offsetof(struct sockaddr_un, sun_path) + 1 + + snprintf(sa_un.sun_path+1, sizeof(sa_un.sun_path)-1, "%s", + expand_string(notifier_socket)); +DEBUG(D_any) debug_printf(" @%s\n", sa_un.sun_path+1); +#else /* filesystem-visible and persistent; will neeed removal */ +len = offsetof(struct sockaddr_un, sun_path) + + snprintf(sa_un.sun_path, sizeof(sa_un.sun_path), "%s", + expand_string(notifier_socket)); +DEBUG(D_any) debug_printf(" %s\n", sa_un.sun_path); +#endif + +if (bind(fd, (const struct sockaddr *)&sa_un, len) < 0) + { where = US"bind"; goto bad; } + +#ifdef SO_PASSCRED /* Linux */ +if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)) < 0) + { where = US"SO_PASSCRED"; goto bad2; } +#elif defined(LOCAL_CREDS) /* FreeBSD-ish */ +if (setsockopt(fd, 0, LOCAL_CREDS, &on, sizeof(on)) < 0) + { where = US"LOCAL_CREDS"; goto bad2; } +#endif + +/* debug_printf("%s: fd %d\n", __FUNCTION__, fd); */ +daemon_notifier_fd = fd; +return; + +bad2: +#ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS + Uunlink(sa_un.sun_path); +#endif +bad: + log_write(0, LOG_MAIN|LOG_PANIC, "%s %s: %s", + __FUNCTION__, where, strerror(errno)); + close(fd); + return; +} + + +static uschar queuerun_msgid[MESSAGE_ID_LENGTH+1]; + +/* Return TRUE if a sigalrm should be emulated */ +static BOOL +daemon_notification(void) +{ +uschar buf[256], cbuf[256]; +struct sockaddr_un sa_un; +struct iovec iov = {.iov_base = buf, .iov_len = sizeof(buf)-1}; +struct msghdr msg = { .msg_name = &sa_un, + .msg_namelen = sizeof(sa_un), + .msg_iov = &iov, + .msg_iovlen = 1, + .msg_control = cbuf, + .msg_controllen = sizeof(cbuf) + }; +ssize_t sz; + +buf[sizeof(buf)-1] = 0; +if ((sz = recvmsg(daemon_notifier_fd, &msg, 0)) <= 0) return FALSE; +if (sz >= sizeof(buf)) return FALSE; + +#ifdef notdef +debug_printf("addrlen %d\n", msg.msg_namelen); +#endif +DEBUG(D_queue_run) debug_printf("%s from addr '%s%.*s'\n", __FUNCTION__, + *sa_un.sun_path ? "" : "@", + (int)msg.msg_namelen - (*sa_un.sun_path ? 0 : 1), + sa_un.sun_path + (*sa_un.sun_path ? 0 : 1)); + +/* Refuse to handle the item unless the peer has good credentials */ +#ifdef SCM_CREDENTIALS +# define EXIM_SCM_CR_TYPE SCM_CREDENTIALS +#elif defined(LOCAL_CREDS) && defined(SCM_CREDS) +# define EXIM_SCM_CR_TYPE SCM_CREDS +#else + /* The OS has no way to get the creds of the caller (for a unix/datagram socket. + Punt; don't try to check. */ +#endif + +#ifdef EXIM_SCM_CR_TYPE +for (struct cmsghdr * cp = CMSG_FIRSTHDR(&msg); + cp; + cp = CMSG_NXTHDR(&msg, cp)) + if (cp->cmsg_level == SOL_SOCKET && cp->cmsg_type == EXIM_SCM_CR_TYPE) + { +# ifdef SCM_CREDENTIALS /* Linux */ + struct ucred * cr = (struct ucred *) CMSG_DATA(cp); + if (cr->uid && cr->uid != exim_uid) + { + DEBUG(D_queue_run) debug_printf("%s: sender creds pid %d uid %d gid %d\n", + __FUNCTION__, (int)cr->pid, (int)cr->uid, (int)cr->gid); + return FALSE; + } +# elif defined(LOCAL_CREDS) /* BSD-ish */ + struct sockcred * cr = (struct sockcred *) CMSG_DATA(cp); + if (cr->sc_uid && cr->sc_uid != exim_uid) + { + DEBUG(D_queue_run) debug_printf("%s: sender creds pid ??? uid %d gid %d\n", + __FUNCTION__, (int)cr->sc_uid, (int)cr->sc_gid); + return FALSE; + } +# endif + break; + } +#endif + +buf[sz] = 0; +switch (buf[0]) + { +#ifdef EXPERIMENTAL_QUEUE_RAMP + case NOTIFY_MSG_QRUN: + /* this should be a message_id */ + DEBUG(D_queue_run) + debug_printf("%s: qrunner trigger: %s\n", __FUNCTION__, buf+1); + memcpy(queuerun_msgid, buf+1, MESSAGE_ID_LENGTH+1); + return TRUE; +#endif /*EXPERIMENTAL_QUEUE_RAMP*/ + + case NOTIFY_QUEUE_SIZE_REQ: + { + uschar buf[16]; + int len = snprintf(CS buf, sizeof(buf), "%u", queue_count_cached()); + + DEBUG(D_queue_run) + debug_printf("%s: queue size request: %s\n", __FUNCTION__, buf); + + if (sendto(daemon_notifier_fd, buf, len, 0, + (const struct sockaddr *)&sa_un, msg.msg_namelen) < 0) + log_write(0, LOG_MAIN|LOG_PANIC, + "%s: sendto: %s\n", __FUNCTION__, strerror(errno)); + return FALSE; + } + } +return FALSE; +} + + /************************************************* * Exim Daemon Mainline * *************************************************/ @@ -922,6 +1199,8 @@ ip_address_item *addresses = NULL; time_t last_connection_time = (time_t)0; int local_queue_run_max = atoi(CS expand_string(queue_run_max)); +process_purpose = US"daemon"; + /* If any debugging options are set, turn on the D_pid bit so that all debugging lines get the pid added. */ @@ -930,7 +1209,7 @@ 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, @@ -1069,19 +1348,14 @@ 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))) + while ((s = string_nextinlist(&list, &sep, NULL, 0))) { 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) { @@ -1116,13 +1390,13 @@ if (f.daemon_listen && !f.inetd_wait_mode) list = daemon_smtp_port; sep = 0; - while ((s = string_nextinlist(&list, &sep, big_buffer, big_buffer_size))) + while ((s = string_nextinlist(&list, &sep, NULL, 0))) 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; - (s = string_nextinlist(&list, &sep, big_buffer, big_buffer_size)); + (s = string_nextinlist(&list, &sep, NULL, 0)); pct++) { if (isdigit(*s)) @@ -1187,8 +1461,6 @@ if (f.daemon_listen && !f.inetd_wait_mode) for (ipa = addresses; ipa; ipa = ipa->next) { - int i; - if (Ustrcmp(ipa->address, "0.0.0.0") == 0) ipa->address[0] = 0; else if (Ustrcmp(ipa->address, "::0") == 0) @@ -1206,9 +1478,9 @@ if (f.daemon_listen && !f.inetd_wait_mode) ipa->address[1] == 0 ? US"\"all IPv6\"" : ipa->address); ipa->port = default_smtp_port[0]; - for (i = 1; default_smtp_port[i] > 0; i++) + 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]; @@ -1266,7 +1538,7 @@ 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 */ @@ -1289,9 +1561,8 @@ if (f.daemon_listen) if (smtp_accept_max > 0) { - int i; - smtp_slots = store_get(smtp_accept_max * sizeof(smtp_slot)); - for (i = 0; i < smtp_accept_max; i++) smtp_slots[i] = empty_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; } } @@ -1331,7 +1602,7 @@ if (f.background_daemon) if (getppid() != 1) { - pid_t pid = fork(); + pid_t pid = exim_fork(US"daemon"); if (pid < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "fork() failed when starting daemon: %s", strerror(errno)); if (pid > 0) exit(EXIT_SUCCESS); /* in parent process, just exit */ @@ -1342,6 +1613,8 @@ if (f.background_daemon) /* We are now in the disconnected, daemon process (unless debugging). Set up the listening sockets if required. */ +daemon_notifier_socket(); + if (f.daemon_listen && !f.inetd_wait_mode) { int sk; @@ -1542,12 +1815,7 @@ 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()); @@ -1578,24 +1846,27 @@ 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) { - int i; - queue_pid_slots = store_get(local_queue_run_max * sizeof(pid_t)); - for (i = 0; i < local_queue_run_max; i++) queue_pid_slots[i] = 0; + 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. */ @@ -1619,18 +1890,18 @@ if (f.inetd_wait_mode) set_process_info("daemon(%s): pre-listening socket", version_string); /* set up the timeout logic */ - sigalrm_seen = 1; + sigalrm_seen = TRUE; } else if (f.daemon_listen) { - int i, j; int smtp_ports = 0; int smtps_ports = 0; - ip_address_item * ipa, * i2; - uschar * p = big_buffer; + ip_address_item * ipa; + uschar * p; uschar * qinfo = queue_interval > 0 - ? string_sprintf("-q%s", readconf_printtime(queue_interval)) + ? string_sprintf("-q%s%s", + f.queue_2stage ? "q" : "", readconf_printtime(queue_interval)) : US"no queue runs"; /* Build a list of listening addresses in big_buffer, but limit it to 10 @@ -1640,27 +1911,19 @@ else if (f.daemon_listen) deprecated protocol that starts TLS without using STARTTLS), and others listening for standard SMTP. Keep their listings separate. */ - for (j = 0; j < 2; j++) + for (int j = 0, i; j < 2; j++) { for (i = 0, ipa = addresses; i < 10 && ipa; i++, ipa = ipa->next) { /* First time round, look for SMTP ports; second time round, look for - SMTPS ports. For the first one of each, insert leading text. */ + SMTPS ports. Build IP+port strings. */ if (host_is_tls_on_connect_port(ipa->port) == (j > 0)) { if (j == 0) - { - if (smtp_ports++ == 0) - { - memcpy(p, "SMTP on", 8); - p += 7; - } - } + smtp_ports++; else - if (smtps_ports++ == 0) - p += sprintf(CS p, "%sSMTPS on", - smtp_ports == 0 ? "" : " and for "); + smtps_ports++; /* Now the information about the port (and sometimes interface) */ @@ -1669,40 +1932,67 @@ else if (f.daemon_listen) if (ipa->next && ipa->next->address[0] == 0 && ipa->next->port == ipa->port) { - p += sprintf(CS p, " port %d (IPv6 and IPv4)", ipa->port); - ipa = ipa->next; + ipa->log = string_sprintf(" port %d (IPv6 and IPv4)", ipa->port); + (ipa = ipa->next)->log = NULL; } else if (ipa->v6_include_v4) - p += sprintf(CS p, " port %d (IPv6 with IPv4)", ipa->port); + ipa->log = string_sprintf(" port %d (IPv6 with IPv4)", ipa->port); else - p += sprintf(CS p, " port %d (IPv6)", ipa->port); + ipa->log = string_sprintf(" port %d (IPv6)", ipa->port); } else if (ipa->address[0] == 0) /* v4 wildcard */ - p += sprintf(CS p, " port %d (IPv4)", ipa->port); + ipa->log = string_sprintf(" port %d (IPv4)", ipa->port); else /* check for previously-seen IP */ { + ip_address_item * i2; for (i2 = addresses; i2 != ipa; i2 = i2->next) if ( host_is_tls_on_connect_port(i2->port) == (j > 0) && Ustrcmp(ipa->address, i2->address) == 0 ) { /* found; append port to list */ - if (p[-1] == '}') p--; - while (isdigit(*--p)) ; - p += 1 + sprintf(CS p+1, "%s%d,%d}", *p == ',' ? "" : "{", - i2->port, ipa->port); + for (p = i2->log; *p; ) p++; /* end of existing string */ + if (*--p == '}') *p = '\0'; /* drop EOL */ + while (isdigit(*--p)) ; /* char before port */ + + i2->log = *p == ':' /* no list yet? */ + ? string_sprintf("%.*s{%s,%d}", + (int)(p - i2->log + 1), i2->log, p+1, ipa->port) + : string_sprintf("%s,%d}", i2->log, ipa->port); + ipa->log = NULL; break; } if (i2 == ipa) /* first-time IP */ - p += sprintf(CS p, " [%s]:%d", ipa->address, ipa->port); + ipa->log = string_sprintf(" [%s]:%d", ipa->address, ipa->port); } } } + } - if (ipa) + p = big_buffer; + for (int j = 0, i; j < 2; j++) + { + /* First time round, look for SMTP ports; second time round, look for + SMTPS ports. For the first one of each, insert leading text. */ + + if (j == 0) { - memcpy(p, " ...", 5); - p += 4; + if (smtp_ports > 0) + p += sprintf(CS p, "SMTP on"); } + else + if (smtps_ports > 0) + p += sprintf(CS p, "%sSMTPS on", + smtp_ports == 0 ? "" : " and for "); + + /* Now the information about the port (and sometimes interface) */ + + for (i = 0, ipa = addresses; i < 10 && ipa; i++, ipa = ipa->next) + if (host_is_tls_on_connect_port(ipa->port) == (j > 0)) + if (ipa->log) + p += sprintf(CS p, "%s", ipa->log); + + if (ipa) + p += sprintf(CS p, " ..."); } log_write(0, LOG_MAIN, @@ -1727,10 +2017,27 @@ 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 @@ -1744,6 +2051,10 @@ 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 (;;) @@ -1757,6 +2068,9 @@ 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. @@ -1805,22 +2119,21 @@ for (;;) else { - DEBUG(D_any) debug_printf("SIGALRM received\n"); + DEBUG(D_any) debug_printf("%s received\n", +#ifdef EXPERIMENTAL_QUEUE_RAMP + *queuerun_msgid ? "qrun notification" : +#endif + "SIGALRM"); /* Do a full queue run in a child process, if required, unless we already have enough queue runners on the go. If we are not running as root, a re-exec is required. */ - if (queue_interval > 0 && - (local_queue_run_max <= 0 || queue_run_count < local_queue_run_max)) + if ( queue_interval > 0 + && (local_queue_run_max <= 0 || queue_run_count < local_queue_run_max)) { - if ((pid = fork()) == 0) + if ((pid = exim_fork(US"queue-runner")) == 0) { - int sk; - - DEBUG(D_any) debug_printf("Starting queue-runner: pid %d\n", - (int)getpid()); - /* Disable debugging if it's required only for the daemon process. We leave the above message, because it ties up with the "child ended" debugging messages. */ @@ -1829,13 +2142,14 @@ for (;;) /* Close any open listening sockets in the child */ - for (sk = 0; sk < listen_socket_count; sk++) - (void)close(listen_sockets[sk]); + close_daemon_sockets(daemon_notifier_fd, + listen_sockets, listen_socket_count); /* Reset SIGHUP and SIGCHLD in the child in both cases. */ 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(). */ @@ -1844,21 +2158,34 @@ for (;;) { uschar opt[8]; uschar *p = opt; - uschar *extra[5]; + uschar *extra[7]; int extracount = 1; signal(SIGALRM, SIG_DFL); *p++ = '-'; *p++ = 'q'; - if (f.queue_2stage) *p++ = 'q'; + if ( f.queue_2stage +#ifdef EXPERIMENTAL_QUEUE_RAMP + && !*queuerun_msgid +#endif + ) *p++ = 'q'; if (f.queue_run_first_delivery) *p++ = 'i'; if (f.queue_run_force) *p++ = 'f'; if (f.deliver_force_thaw) *p++ = 'f'; if (f.queue_run_local) *p++ = 'l'; *p = 0; - extra[0] = queue_name + extra[0] = *queue_name ? string_sprintf("%sG%s", opt, queue_name) : opt; +#ifdef EXPERIMENTAL_QUEUE_RAMP + if (*queuerun_msgid) + { + log_write(0, LOG_MAIN, "notify triggered queue run"); + extra[extracount++] = queuerun_msgid; /* Trigger only the */ + extra[extracount++] = queuerun_msgid; /* one message */ + } +#endif + /* If -R or -S were on the original command line, ensure they get passed on. */ @@ -1877,16 +2204,25 @@ for (;;) /* Overlay this process with a new execution. */ - (void)child_exec_exim(CEE_EXEC_PANIC, FALSE, NULL, TRUE, extracount, - extra[0], extra[1], extra[2], extra[3], extra[4]); + (void)child_exec_exim(CEE_EXEC_PANIC, FALSE, NULL, FALSE, extracount, + extra[0], extra[1], extra[2], extra[3], extra[4], extra[5], extra[6]); /* Control never returns here. */ } /* No need to re-exec; SIGALRM remains set to the default handler */ - queue_run(NULL, NULL, FALSE); - _exit(EXIT_SUCCESS); +#ifdef EXPERIMENTAL_QUEUE_RAMP + if (*queuerun_msgid) + { + log_write(0, LOG_MAIN, "notify triggered queue run"); + f.queue_2stage = FALSE; + queue_run(queuerun_msgid, queuerun_msgid, FALSE); + } + else +#endif + queue_run(NULL, NULL, FALSE); + exim_underbar_exit(EXIT_SUCCESS); } if (pid < 0) @@ -1897,8 +2233,7 @@ for (;;) } else { - int i; - for (i = 0; i < local_queue_run_max; ++i) + for (int i = 0; i < local_queue_run_max; ++i) if (queue_pid_slots[i] <= 0) { queue_pid_slots[i] = pid; @@ -1906,14 +2241,19 @@ for (;;) break; } DEBUG(D_any) debug_printf("%d queue-runner process%s running\n", - queue_run_count, (queue_run_count == 1)? "" : "es"); + queue_run_count, queue_run_count == 1 ? "" : "es"); } } /* Reset the alarm clock */ sigalrm_seen = FALSE; - ALARM(queue_interval); +#ifdef EXPERIMENTAL_QUEUE_RAMP + if (*queuerun_msgid) + *queuerun_msgid = 0; + else +#endif + ALARM(queue_interval); } } /* sigalrm_seen */ @@ -1930,13 +2270,15 @@ for (;;) if (f.daemon_listen) { - int sk, lcount, select_errno; + int lcount, select_errno; int max_socket = 0; BOOL select_failed = FALSE; fd_set select_listen; FD_ZERO(&select_listen); - for (sk = 0; sk < listen_socket_count; sk++) + if (daemon_notifier_fd >= 0) + FD_SET(daemon_notifier_fd, &select_listen); + for (int sk = 0; sk < listen_socket_count; sk++) { FD_SET(listen_sockets[sk], &select_listen); if (listen_sockets[sk] > max_socket) max_socket = listen_sockets[sk]; @@ -1977,6 +2319,11 @@ 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. */ @@ -1986,7 +2333,15 @@ for (;;) int accept_socket = -1; if (!select_failed) - for (sk = 0; sk < listen_socket_count; sk++) + { + if ( daemon_notifier_fd >= 0 + && FD_ISSET(daemon_notifier_fd, &select_listen)) + { + FD_CLR(daemon_notifier_fd, &select_listen); + sigalrm_seen = daemon_notification(); + break; /* to top of daemon loop */ + } + for (int sk = 0; sk < listen_socket_count; sk++) if (FD_ISSET(listen_sockets[sk], &select_listen)) { len = sizeof(accepted); @@ -1995,6 +2350,7 @@ for (;;) FD_CLR(listen_sockets[sk], &select_listen); break; } + } /* If select or accept has failed and this was not caused by an interruption, log the incident and try again. With asymmetric TCP/IP @@ -2095,11 +2451,10 @@ for (;;) if (sighup_seen) { - int sk; log_write(0, LOG_MAIN, "pid %d: SIGHUP received: re-exec daemon", getpid()); - for (sk = 0; sk < listen_socket_count; sk++) - (void)close(listen_sockets[sk]); + close_daemon_sockets(daemon_notifier_fd, + listen_sockets, listen_socket_count); ALARM_CLR(0); signal(SIGHUP, SIG_IGN); sighup_argv[0] = exim_path;