* Exim - an Internet mail transport agent *
*************************************************/
+/* Copyright (c) The Exim Maintainers 2020 - 2022 */
/* Copyright (c) University of Cambridge 1995 - 2018 */
-/* Copyright (c) The Exim Maintainers 2020 */
/* See the file NOTICE for conditions of use and distribution. */
+/* SPDX-License-Identifier: GPL-2.0-only */
/* Functions concerned with running Exim as a daemon */
}
-/* SIGTERM handler. Try to get the damon pif file removed
+/* SIGTERM handler. Try to get the daemon pid file removed
before exiting. */
static void
static void
close_daemon_sockets(int daemon_notifier_fd,
- int * listen_sockets, int listen_socket_count)
+ struct pollfd * fd_polls, int listen_socket_count)
{
if (daemon_notifier_fd >= 0)
{
#endif
}
-for (int i = 0; i < listen_socket_count; i++) (void) close(listen_sockets[i]);
+for (int i = 0; i < listen_socket_count; i++) (void) close(fd_polls[i].fd);
}
leak store in this process - reset the stacking pool at the end.
Arguments:
- listen_sockets sockets which are listening for incoming calls
+ fd_polls sockets which are listening for incoming calls
listen_socket_count count of listening sockets
accept_socket socket of the current accepted call
accepted socket information about the current call
*/
static void
-handle_smtp_call(int *listen_sockets, int listen_socket_count,
+handle_smtp_call(struct pollfd *fd_polls, int listen_socket_count,
int accept_socket, struct sockaddr *accepted)
{
pid_t pid;
extensive comment before the reception loop in exim.c for a fuller
explanation of this logic. */
- close_daemon_sockets(daemon_notifier_fd, listen_sockets, listen_socket_count);
+ close_daemon_sockets(daemon_notifier_fd, fd_polls, 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. */
the incoming host address and an expanded active_hostname. */
log_close_all();
-interface_address =
-sender_host_address = NULL;
+interface_address = sender_host_name = sender_host_address = NULL;
store_reset(reset_point);
-sender_host_address = NULL;
}
* Listener socket for local work prompts *
*************************************************/
+ssize_t
+daemon_client_sockname(struct sockaddr_un * sup, uschar ** sname)
+{
+#ifdef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
+sup->sun_path[0] = 0; /* Abstract local socket addr - Linux-specific? */
+return offsetof(struct sockaddr_un, sun_path) + 1
+ + snprintf(sup->sun_path+1, sizeof(sup->sun_path)-1, "exim_%d", getpid());
+#else
+*sname = string_sprintf("%s/p_%d", spool_directory, getpid());
+return offsetof(struct sockaddr_un, sun_path)
+ + snprintf(sup->sun_path, sizeof(sup->sun_path), "%s", sname);
+#endif
+}
+
+ssize_t
+daemon_notifier_sockname(struct sockaddr_un * sup)
+{
+#ifdef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
+sup->sun_path[0] = 0; /* Abstract local socket addr - Linux-specific? */
+return offsetof(struct sockaddr_un, sun_path) + 1
+ + snprintf(sup->sun_path+1, sizeof(sup->sun_path)-1, "%s",
+ expand_string(notifier_socket));
+#else
+return offsetof(struct sockaddr_un, sun_path)
+ + snprintf(sup->sun_path, sizeof(sup->sun_path), "%s",
+ expand_string(notifier_socket));
+#endif
+}
+
+
static void
daemon_notifier_socket(void)
{
int fd;
const uschar * where;
struct sockaddr_un sa_un = {.sun_family = AF_UNIX};
-int len;
+ssize_t len;
if (!notifier_socket || !*notifier_socket)
{
(void)fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
#endif
+len = daemon_notifier_sockname(&sa_un);
+
#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)
+if (bind(fd, (const struct sockaddr *)&sa_un, (socklen_t)len) < 0)
{ where = US"bind"; goto bad; }
#ifdef SO_PASSCRED /* Linux */
static uschar queuerun_msgid[MESSAGE_ID_LENGTH+1];
-/* Return TRUE if a sigalrm should be emulated */
+/* The notifier socket has something to read. Pull the message from it, decode
+and do the action.
+
+Return TRUE if a sigalrm should be emulated */
+
static BOOL
daemon_notification(void)
{
{
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);
{
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;
(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;
+ break;
}
+
+ case NOTIFY_REGEX:
+ regex_at_daemon(buf);
+ break;
}
return FALSE;
}
-
-static void
-add_listener_socket(int fd, fd_set * fds, int * fd_max)
-{
-FD_SET(fd, fds);
-if (fd > *fd_max) *fd_max = fd;
-}
-
/*************************************************
* Exim Daemon Mainline *
*************************************************/
daemon_go(void)
{
struct passwd * pw;
-int * listen_sockets = NULL;
-int listen_socket_count = 0, listen_fd_max = 0;
-fd_set select_listen;
+struct pollfd * fd_polls, * tls_watch_poll = NULL, * dnotify_poll = NULL;
+int listen_socket_count = 0, poll_fd_count;
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));
DEBUG(D_any|D_v) debug_selector |= D_pid;
-FD_ZERO(&select_listen);
+/* Allocate enough pollstructs for inetd mode plus the ancillary sockets;
+also used when there are no listen sockets. */
+
+fd_polls = store_get(sizeof(struct pollfd) * 3, GET_UNTAINTED);
+
if (f.inetd_wait_mode)
{
listen_socket_count = 1;
- listen_sockets = store_get(sizeof(int), FALSE);
(void) close(3);
if (dup2(0, 3) == -1)
log_write(0, LOG_MAIN|LOG_PANIC_DIE,
"failed to dup inetd socket safely away: %s", strerror(errno));
- listen_sockets[0] = 3;
+ fd_polls[0].fd = 3;
+ fd_polls[0].events = POLLIN;
(void) close(0);
(void) close(1);
(void) close(2);
if (setsockopt(3, IPPROTO_TCP, TCP_NODELAY, US &on, sizeof(on)))
log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to set socket NODELAY: %s",
strerror(errno));
-
- FD_SET(3, &select_listen);
- listen_fd_max = 3;
}
sep = 0;
while ((s = string_nextinlist(&list, &sep, NULL, 0)))
pct++;
- default_smtp_port = store_get((pct+1) * sizeof(int), FALSE);
+ default_smtp_port = store_get((pct+1) * sizeof(int), GET_UNTAINTED);
list = daemon_smtp_port;
sep = 0;
for (pct = 0;
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), FALSE);
+ ip_address_item * new = store_get(sizeof(ip_address_item), GET_UNTAINTED);
memcpy(new->address, ipa->address, Ustrlen(ipa->address) + 1);
new->port = default_smtp_port[i];
}
}
- /* Get a vector to remember all the sockets in */
+ /* Get a vector to remember all the sockets in.
+ Two extra elements for the ancillary sockets */
for (ipa = addresses; ipa; ipa = ipa->next)
listen_socket_count++;
- listen_sockets = store_get(sizeof(int) * listen_socket_count, FALSE);
+ fd_polls = store_get(sizeof(struct pollfd) * (listen_socket_count + 2),
+ GET_UNTAINTED);
+ for (struct pollfd * p = fd_polls; p < fd_polls + listen_socket_count + 2;
+ p++)
+ { p->fd = -1; p->events = POLLIN; }
} /* daemon_listen but not inetd_wait_mode */
if (smtp_accept_max > 0)
{
- smtp_slots = store_get(smtp_accept_max * sizeof(smtp_slot), FALSE);
+ smtp_slots = store_get(smtp_accept_max * sizeof(smtp_slot), GET_UNTAINTED);
for (int i = 0; i < smtp_accept_max; i++) smtp_slots[i] = empty_smtp_slot;
}
}
daemon as the result of a SIGHUP. In this case, there is no need to do
anything, because the controlling terminal has long gone. Otherwise, fork, in
case current process is a process group leader (see 'man setsid' for an
- explanation) before calling setsid(). */
+ explanation) before calling setsid().
+ All other forks want daemon_listen cleared. Rather than blow a register, jsut
+ restore it here. */
if (getppid() != 1)
{
+ BOOL daemon_listen = f.daemon_listen;
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 */
(void)setsid(); /* release controlling terminal */
+ f.daemon_listen = daemon_listen;
}
}
wildcard = ipa->address[0] == 0;
}
- if ((listen_sockets[sk] = fd = ip_socket(SOCK_STREAM, af)) < 0)
+ if ((fd_polls[sk].fd = fd = ip_socket(SOCK_STREAM, af)) < 0)
{
if (check_special_case(0, addresses, ipa, FALSE))
{
goto SKIP_SOCKET;
}
log_write(0, LOG_PANIC_DIE, "IPv%c socket creation failed: %s",
- (af == AF_INET6)? '6' : '4', strerror(errno));
+ af == AF_INET6 ? '6' : '4', strerror(errno));
}
/* If this is an IPv6 wildcard socket, set IPV6_V6ONLY if that option is
#ifdef IPV6_V6ONLY
if (af == AF_INET6 && wildcard &&
- setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, CS (&on),
- sizeof(on)) < 0)
+ setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0)
log_write(0, LOG_MAIN, "Setting IPV6_V6ONLY on daemon's IPv6 wildcard "
"socket failed (%s): carrying on without it", strerror(errno));
#endif /* IPV6_V6ONLY */
is being handled. Without this, a connection will prevent reuse of the
smtp port for listening. */
- if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
- US (&on), sizeof(on)) < 0)
+ if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
log_write(0, LOG_MAIN|LOG_PANIC_DIE, "setting SO_REUSEADDR on socket "
"failed when starting daemon: %s", strerror(errno));
/* Set TCP_NODELAY; Exim does its own buffering. There is a switch to
disable this because it breaks some broken clients. */
- if (tcp_nodelay) setsockopt(fd, IPPROTO_TCP, TCP_NODELAY,
- US (&on), sizeof(on));
+ if (tcp_nodelay) setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on));
/* Now bind the socket to the required port; if Exim is being restarted
it may not always be possible to bind immediately, even with SO_REUSEADDR
f.tcp_fastopen_ok = FALSE;
}
#endif
-
- add_listener_socket(fd, &select_listen, &listen_fd_max);
+ fd_polls[sk].fd = fd;
continue;
}
DEBUG(D_any) debug_printf("%s pid file %s: %s\n", (operation == PID_WRITE) ? "write" : "check", pid_file_path, strerror(errno));
}
-/* Add ancillary sockets to the set for select */
-
-#ifndef DISABLE_TLS
-if (tls_watch_fd >= 0)
- add_listener_socket(tls_watch_fd, &select_listen, &listen_fd_max);
-#endif
-if (daemon_notifier_fd >= 0)
- add_listener_socket(daemon_notifier_fd, &select_listen, &listen_fd_max);
-
-listen_fd_max++;
-
/* Set up the handler for SIGHUP, which causes a restart of the daemon. */
sighup_seen = FALSE;
if (queue_interval > 0 && local_queue_run_max > 0)
{
- queue_pid_slots = store_get(local_queue_run_max * sizeof(pid_t), FALSE);
+ queue_pid_slots = store_get(local_queue_run_max * sizeof(pid_t), GET_UNTAINTED);
for (int i = 0; i < local_queue_run_max; i++) queue_pid_slots[i] = 0;
}
if (*--p == '}') *p = '\0'; /* drop EOL */
while (isdigit(*--p)) ; /* char before port */
- i2->log = *p == ':' /* no list yet? */
+ 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);
tls_daemon_init();
#endif
+/* Add ancillary sockets to the set for select */
+
+poll_fd_count = listen_socket_count;
+#ifndef DISABLE_TLS
+if (tls_watch_fd >= 0)
+ {
+ tls_watch_poll = &fd_polls[poll_fd_count++];
+ tls_watch_poll->fd = tls_watch_fd;
+ tls_watch_poll->events = POLLIN;
+ }
+#endif
+if (daemon_notifier_fd >= 0)
+ {
+ dnotify_poll = &fd_polls[poll_fd_count++];
+ dnotify_poll->fd = daemon_notifier_fd;
+ dnotify_poll->events = POLLIN;
+ }
+
/* 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
closes the log afterwards, for the same reason. */
/* Close any open listening sockets in the child */
close_daemon_sockets(daemon_notifier_fd,
- listen_sockets, listen_socket_count);
+ fd_polls, listen_socket_count);
/* Reset SIGHUP and SIGCHLD in the child in both cases. */
if (f.daemon_listen)
{
- int check_lsk = 0, lcount;
+ int lcount;
BOOL select_failed = FALSE;
- fd_set fds = select_listen;
DEBUG(D_any) debug_printf("Listening...\n");
errno = EINTR;
}
else
- lcount = select(listen_fd_max, (SELECT_ARG2_TYPE *)&fds,
- NULL, NULL, NULL);
+ lcount = poll(fd_polls, poll_fd_count, -1);
if (lcount < 0)
{
handle_ending_processes();
#ifndef DISABLE_TLS
+ {
+ int old_tfd;
/* Create or rotate any required keys; handle (delayed) filewatch event */
- tls_daemon_tick();
+
+ if ((old_tfd = tls_daemon_tick()) >= 0)
+ for (struct pollfd * p = &fd_polls[listen_socket_count];
+ p < fd_polls + poll_fd_count; p++)
+ if (p->fd == old_tfd) { p->fd = tls_watch_fd ; break; }
+ }
#endif
errno = select_errno;
}
if (!select_failed)
{
#if !defined(DISABLE_TLS) && (defined(EXIM_HAVE_INOTIFY) || defined(EXIM_HAVE_KEVENT))
- if (tls_watch_fd >= 0 && FD_ISSET(tls_watch_fd, &fds))
+ if (tls_watch_poll && tls_watch_poll->revents & POLLIN)
{
+ tls_watch_poll->revents = 0;
tls_watch_trigger_time = time(NULL); /* Set up delayed event */
tls_watch_discard_event(tls_watch_fd);
break; /* to top of daemon loop */
}
#endif
- if (daemon_notifier_fd >= 0 && FD_ISSET(daemon_notifier_fd, &fds))
+ if (dnotify_poll && dnotify_poll->revents & POLLIN)
{
+ dnotify_poll->revents = 0;
sigalrm_seen = daemon_notification();
break; /* to top of daemon loop */
}
- while (check_lsk < listen_socket_count)
- {
- int lfd = listen_sockets[check_lsk++];
- if (FD_ISSET(lfd, &fds))
+ for (struct pollfd * p = fd_polls; p < fd_polls + listen_socket_count;
+ p++)
+ if (p->revents & POLLIN)
{
EXIM_SOCKLEN_T alen = sizeof(accepted);
-#if defined(TCP_INFO)
+#ifdef TCP_INFO
struct tcp_info ti;
socklen_t tlen = sizeof(ti);
smtp_listen_backlog = 0;
if ( smtp_backlog_monitor > 0
- && getsockopt(lfd, IPPROTO_TCP, TCP_INFO, &ti, &tlen) == 0)
+ && getsockopt(p->fd, IPPROTO_TCP, TCP_INFO, &ti, &tlen) == 0)
{
- DEBUG(D_interface) debug_printf("listen fd %d queue max %u curr %u\n",
# ifdef EXIM_HAVE_TCPI_UNACKED
- lfd, ti.tcpi_sacked, ti.tcpi_unacked);
+ DEBUG(D_interface) debug_printf("listen fd %d queue max %u curr %u\n",
+ p->fd, ti.tcpi_sacked, ti.tcpi_unacked);
smtp_listen_backlog = ti.tcpi_unacked;
# elif defined(__FreeBSD__) /* This does not work. Investigate kernel sourcecode. */
- lfd, ti.__tcpi_sacked, ti.__tcpi_unacked);
+ DEBUG(D_interface) debug_printf("listen fd %d queue max %u curr %u\n",
+ p->fd, ti.__tcpi_sacked, ti.__tcpi_unacked);
smtp_listen_backlog = ti.__tcpi_unacked;
# endif
-#endif
}
- accept_socket = accept(lfd, (struct sockaddr *)&accepted, &alen);
+#endif
+ p->revents = 0;
+ accept_socket = accept(p->fd, (struct sockaddr *)&accepted, &alen);
break;
}
- }
}
/* If select or accept has failed and this was not caused by an
#endif
if (inetd_wait_timeout)
last_connection_time = time(NULL);
- handle_smtp_call(listen_sockets, listen_socket_count, accept_socket,
+ handle_smtp_call(fd_polls, listen_socket_count, accept_socket,
(struct sockaddr *)&accepted);
}
}
else
{
- struct timeval tv;
- tv.tv_sec = queue_interval;
- tv.tv_usec = 0;
- select(0, NULL, NULL, NULL, &tv);
+ struct pollfd p;
+ poll(&p, 0, queue_interval * 1000);
handle_ending_processes();
}
{
log_write(0, LOG_MAIN, "pid %d: SIGHUP received: re-exec daemon",
getpid());
- close_daemon_sockets(daemon_notifier_fd,
- listen_sockets, listen_socket_count);
+ close_daemon_sockets(daemon_notifier_fd, fd_polls, listen_socket_count);
ALARM_CLR(0);
signal(SIGHUP, SIG_IGN);
sighup_argv[0] = exim_path;
git://git.exim.org / exim.git / blobdiff