-/* $Cambridge: exim/src/src/daemon.c,v 1.1 2004/10/07 10:39:01 ph10 Exp $ */
-
/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2004 */
+/* Copyright (c) University of Cambridge 1995 - 2018 */
/* See the file NOTICE for conditions of use and distribution. */
/* Functions concerned with running Exim as a daemon */
} smtp_slot;
/* An empty slot for initializing (Standard C does not allow constructor
-expressions in assigments except as initializers in declarations). */
+expressions in assignments except as initializers in declarations). */
-static smtp_slot empty_smtp_slot = { 0, NULL };
+static smtp_slot empty_smtp_slot = { .pid = 0, .host_address = NULL };
* Local static variables *
*************************************************/
-static volatile BOOL sigchld_seen;
-static volatile BOOL sighup_seen;
+static SIGNAL_BOOL sigchld_seen;
+static SIGNAL_BOOL sighup_seen;
static int accept_retry_count = 0;
static int accept_retry_errno;
static BOOL accept_retry_select_failed;
static int queue_run_count = 0;
-static pid_t *queue_pid_slots;
-static smtp_slot *smtp_slots;
+static pid_t *queue_pid_slots = NULL;
+static smtp_slot *smtp_slots = NULL;
static BOOL write_pid = TRUE;
main_sigchld_handler(int sig)
{
sig = sig; /* Keep picky compilers happy */
+os_non_restarting_signal(SIGCHLD, SIG_DFL);
sigchld_seen = TRUE;
-signal(SIGCHLD, SIG_DFL);
}
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", smtp_msg);
+if (smtp_out) smtp_printf("421 %s\r\n", FALSE, smtp_msg);
}
{
pid_t pid;
union sockaddr_46 interface_sockaddr;
-SOCKLEN_T ifsize = sizeof(interface_sockaddr);
+EXIM_SOCKLEN_T ifsize = sizeof(interface_sockaddr);
int dup_accept_socket = -1;
int max_for_this_host = 0;
-int wfsize = 0;
-int wfptr = 0;
-int use_log_write_selector = log_write_selector;
-uschar *whofrom = NULL;
+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. */
input stream. These operations fail only the exceptional circumstances. Note
that never_error() won't use smtp_out if it is NULL. */
-smtp_out = fdopen(accept_socket, "wb");
-if (smtp_out == NULL)
+if (!(smtp_out = fdopen(accept_socket, "wb")))
{
never_error(US"daemon: fdopen() for smtp_out failed", US"", errno);
goto ERROR_RETURN;
}
-dup_accept_socket = dup(accept_socket);
-if (dup_accept_socket < 0)
+if ((dup_accept_socket = dup(accept_socket)) < 0)
{
never_error(US"daemon: couldn't dup socket descriptor",
US"Connection setup failed", errno);
goto ERROR_RETURN;
}
-smtp_in = fdopen(dup_accept_socket, "rb");
-if (smtp_in == NULL)
+if (!(smtp_in = fdopen(dup_accept_socket, "rb")))
{
never_error(US"daemon: fdopen() for smtp_in failed",
US"Connection setup failed", errno);
goto ERROR_RETURN;
}
-/* Get the data for the local interface address. */
+/* Get the data for the local interface address. Panic for most errors, but
+"connection reset by peer" just means the connection went away. */
if (getsockname(accept_socket, (struct sockaddr *)(&interface_sockaddr),
&ifsize) < 0)
{
- log_write(0, LOG_MAIN|LOG_PANIC, "getsockname() failed: %s",
- strerror(errno));
- smtp_printf("421 Local problem: getsockname() failed; please try again later\r\n");
+ log_write(0, LOG_MAIN | ((errno == ECONNRESET)? 0 : LOG_PANIC),
+ "getsockname() failed: %s", strerror(errno));
+ smtp_printf("421 Local problem: getsockname() failed; please try again later\r\n", FALSE);
goto ERROR_RETURN;
}
the local interface data. This is for logging; at the end of this function the
memory is reclaimed. */
-whofrom = string_append(whofrom, &wfsize, &wfptr, 3, "[", sender_host_address, "]");
+whofrom = string_append(NULL, 3, "[", sender_host_address, "]");
-if ((log_extra_selector & LX_incoming_port) != 0)
- whofrom = string_append(whofrom, &wfsize, &wfptr, 2, ":", string_sprintf("%d",
- sender_host_port));
+if (LOGGING(incoming_port))
+ whofrom = string_fmt_append(whofrom, ":%d", sender_host_port);
-if ((log_extra_selector & LX_incoming_interface) != 0)
- whofrom = string_append(whofrom, &wfsize, &wfptr, 4, " I=[",
- interface_address, "]:", string_sprintf("%d", interface_port));
+if (LOGGING(incoming_interface))
+ whofrom = string_fmt_append(whofrom, " I=[%s]:%d",
+ interface_address, interface_port);
-whofrom[wfptr] = 0; /* Terminate the newly-built string */
+(void) string_from_gstring(whofrom); /* Terminate the newly-built string */
/* Check maximum number of connections. We do not check for reserved
connections or unacceptable hosts here. That is done in the subprocess because
DEBUG(D_any) debug_printf("rejecting SMTP connection: count=%d max=%d\n",
smtp_accept_count, smtp_accept_max);
smtp_printf("421 Too many concurrent SMTP connections; "
- "please try again later.\r\n");
+ "please try again later.\r\n", FALSE);
log_write(L_connection_reject,
LOG_MAIN, "Connection from %s refused: too many connections",
- whofrom);
+ whofrom->s);
goto ERROR_RETURN;
}
if (smtp_load_reserve >= 0)
{
- load_average = os_getloadavg();
+ load_average = OS_GETLOADAVG();
if (smtp_reserve_hosts == NULL && load_average > smtp_load_reserve)
{
DEBUG(D_any) debug_printf("rejecting SMTP connection: load average = %.2f\n",
(double)load_average/1000.0);
- smtp_printf("421 Too much load; please try again later.\r\n");
+ smtp_printf("421 Too much load; please try again later.\r\n", FALSE);
log_write(L_connection_reject,
LOG_MAIN, "Connection from %s refused: load average = %.2f",
- whofrom, (double)load_average/1000.0);
+ whofrom->s, (double)load_average/1000.0);
goto ERROR_RETURN;
}
}
uschar *expanded = expand_string(smtp_accept_max_per_host);
if (expanded == NULL)
{
- if (!expand_string_forcedfail)
+ if (!f.expand_string_forcedfail)
log_write(0, LOG_MAIN|LOG_PANIC, "expansion of smtp_accept_max_per_host "
- "failed for %s: %s", whofrom, expand_string_message);
+ "failed for %s: %s", whofrom->s, expand_string_message);
}
/* For speed, interpret a decimal number inline here */
else
max_for_this_host = max_for_this_host * 10 + *s++ - '0';
if (*s != 0)
log_write(0, LOG_MAIN|LOG_PANIC, "expansion of smtp_accept_max_per_host "
- "for %s contains non-digit: %s", whofrom, expanded);
+ "for %s contains non-digit: %s", whofrom->s, expanded);
}
}
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)
- {
- if (smtp_slots[i].host_address != NULL)
+ 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)
host_accept_count++;
((smtp_accept_count - other_host_count) < max_for_this_host))
break;
}
- }
if (host_accept_count >= max_for_this_host)
{
"IP address: count=%d max=%d\n",
host_accept_count, max_for_this_host);
smtp_printf("421 Too many concurrent SMTP connections "
- "from this IP address; please try again later.\r\n");
+ "from this IP address; please try again later.\r\n", FALSE);
log_write(L_connection_reject,
LOG_MAIN, "Connection from %s refused: too many connections "
- "from that IP address", whofrom);
+ "from that IP address", whofrom->s);
goto ERROR_RETURN;
}
}
selector is set, check whether the host is on the list for logging. If not,
arrange to unset the selector in the subprocess. */
-if ((log_write_selector & L_smtp_connection) != 0)
+if (LOGGING(smtp_connection))
{
uschar *list = hosts_connection_nolog;
+ memset(sender_host_cache, 0, sizeof(sender_host_cache));
if (list != NULL && verify_check_host(&list) == OK)
- use_log_write_selector &= ~L_smtp_connection;
+ save_log_selector &= ~L_smtp_connection;
else
log_write(L_smtp_connection, LOG_MAIN, "SMTP connection from %s "
- "(TCP/IP connection count = %d)", whofrom, smtp_accept_count + 1);
+ "(TCP/IP connection count = %d)", whofrom->s, smtp_accept_count + 1);
}
/* Now we can fork the accepting process; do a lookup tidy, just in case any
int i;
int queue_only_reason = 0;
int old_pool = store_pool;
+ int save_debug_selector = debug_selector;
BOOL local_queue_only;
+ BOOL session_local_queue_only;
#ifdef SA_NOCLDWAIT
struct sigaction act;
#endif
+ smtp_accept_count++; /* So that it includes this process */
+
/* May have been modified for the subprocess */
- log_write_selector = use_log_write_selector;
+ *log_selector = save_log_selector;
/* Get the local interface address into permanent store */
/* Check for a tls-on-connect port */
- if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
+ if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
/* Expand smtp_active_hostname if required. We do not do this any earlier,
because it may depend on the local interface address (indeed, that is most
likely what it depends on.) */
smtp_active_hostname = primary_hostname;
- if (raw_active_hostname != NULL)
+ if (raw_active_hostname)
{
- uschar *nah = expand_string(raw_active_hostname);
- if (nah == NULL)
+ uschar * nah = expand_string(raw_active_hostname);
+ if (!nah)
{
- if (!expand_string_forcedfail)
+ if (!f.expand_string_forcedfail)
{
log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand \"%s\" "
"(smtp_active_hostname): %s", raw_active_hostname,
expand_string_message);
smtp_printf("421 Local configuration error; "
- "please try again later.\r\n");
+ "please try again later.\r\n", FALSE);
mac_smtp_fflush();
search_tidyup();
- _exit(EXIT_FAILURE);
+ exim_underbar_exit(EXIT_FAILURE);
}
}
- else if (nah[0] != 0) smtp_active_hostname = nah;
+ else if (*nah) smtp_active_hostname = nah;
}
/* Initialize the queueing flags */
queue_check_only();
- local_queue_only = queue_only;
+ session_local_queue_only = queue_only;
/* Close the listening sockets, and set the SIGCHLD handler to SIG_IGN.
We also attempt to set things up so that children are automatically reaped,
extensive comment before the reception loop in exim.c for a fuller
explanation of this logic. */
- for (i = 0; i < listen_socket_count; i++) close(listen_sockets[i]);
+ for (i = 0; i < listen_socket_count; i++) (void)close(listen_sockets[i]);
+
+ /* 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. */
+ (void)fcntl(accept_socket, F_SETFD,
+ fcntl(accept_socket, F_GETFD) | FD_CLOEXEC);
+ (void)fcntl(dup_accept_socket, F_SETFD,
+ fcntl(dup_accept_socket, F_GETFD) | FD_CLOEXEC);
#ifdef SA_NOCLDWAIT
act.sa_handler = SIG_IGN;
/* 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
main process if there is any delay. Then set up the fullhost information
- in case there is no HELO/EHLO. */
+ in case there is no HELO/EHLO.
+ If debugging is enabled only for the daemon, we must turn if off while
+ finding the id, but turn it on again afterwards so that information about the
+ incoming connection is output. */
+
+ if (f.debug_daemon) debug_selector = 0;
verify_get_ident(IDENT_PORT);
host_build_sender_fullhost();
+ debug_selector = save_debug_selector;
DEBUG(D_any)
debug_printf("Process %d is handling incoming connection from %s\n",
(int)getpid(), sender_fullhost);
+ /* Now disable debugging permanently if it's required only for the daemon
+ process. */
+
+ if (f.debug_daemon) debug_selector = 0;
+
/* If there are too many child processes for immediate delivery,
- set the local_queue_only flag, which is initialized from the
+ set the session_local_queue_only flag, which is initialized from the
configured value and may therefore already be TRUE. Leave logging
- till later so it will have a message id attached. */
+ till later so it will have a message id attached. Note that there is no
+ possibility of re-calculating this per-message, because the value of
+ smtp_accept_count does not change in this subprocess. */
- if (smtp_accept_queue > 0 && smtp_accept_count >= smtp_accept_queue)
+ if (smtp_accept_queue > 0 && smtp_accept_count > smtp_accept_queue)
{
- local_queue_only = TRUE;
+ session_local_queue_only = TRUE;
queue_only_reason = 1;
}
/* Handle the start of the SMTP session, then loop, accepting incoming
messages from the SMTP connection. The end will come at the QUIT command,
when smtp_setup_msg() returns 0. A break in the connection causes the
- process to die (see accept.c). */
+ process to die (see accept.c).
+
+ NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
+ because a log line has already been written for all its failure exists
+ (usually "connection refused: <reason>") and writing another one is
+ unnecessary clutter. */
if (!smtp_start_session())
{
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());
search_tidyup(); /* Close cached databases */
if (!ok) /* Connection was dropped */
{
+ cancel_cutthrough_connection(TRUE, US"receive dropped");
mac_smtp_fflush();
- _exit(EXIT_SUCCESS);
+ smtp_log_no_mail(); /* Log no mail if configured */
+ exim_underbar_exit(EXIT_SUCCESS);
}
if (message_id[0] == 0) continue; /* No message was accepted */
}
else
{
- mac_smtp_fflush();
+ if (smtp_out)
+ {
+ 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(int i = 16; read(fd, buf, sizeof(buf)) > 0 && i > 0; ) i--;
+ }
+ cancel_cutthrough_connection(TRUE, US"message setup dropped");
search_tidyup();
- _exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
+ smtp_log_no_mail(); /* Log no mail if configured */
+
+ /*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");
+ exim_underbar_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
}
/* Show the recipients when debugging */
DEBUG(D_receive)
{
- int i;
- if (sender_address != NULL)
+ if (sender_address)
debug_printf("Sender: %s\n", sender_address);
- if (recipients_list != NULL)
+ 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);
}
}
/* Reclaim up the store used in accepting this message */
- store_reset(reset_point);
+ {
+ 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;
+ }
/* If queue_only is set or if there are too many incoming connections in
- existence, local_queue_only will be TRUE. If it is not, check whether we
- have received too many messages in this session for immediate delivery. If
- not, and queue_only_load is set, check that the load average is below it.
- Note that, once set, local_queue_only remains set for any subsequent
- messages on the same SMTP connection. This is a deliberate choice; even
- though the load average may fall, it doesn't seem right to deliver later
- messages on the same call when not delivering earlier ones. */
-
- if (!local_queue_only)
+ existence, session_local_queue_only will be TRUE. If it is not, check
+ whether we have received too many messages in this session for immediate
+ delivery. */
+
+ if (!session_local_queue_only &&
+ smtp_accept_queue_per_connection > 0 &&
+ receive_messagecount > smtp_accept_queue_per_connection)
{
- if (smtp_accept_queue_per_connection > 0 &&
- receive_messagecount > smtp_accept_queue_per_connection)
- {
- local_queue_only = TRUE;
- queue_only_reason = 2;
- }
- else if (queue_only_load >= 0)
- {
- local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
- if (local_queue_only) queue_only_reason = 3;
- }
+ session_local_queue_only = TRUE;
+ queue_only_reason = 2;
+ }
+
+ /* Initialize local_queue_only from session_local_queue_only. If it is not
+ true, and queue_only_load is set, check that the load average is below it.
+ If local_queue_only is set by this means, we also set if for the session if
+ queue_only_load_latch is true (the default). This means that, once set,
+ local_queue_only remains set for any subsequent messages on the same SMTP
+ connection. This is a deliberate choice; even though the load average may
+ fall, it doesn't seem right to deliver later messages on the same call when
+ not delivering earlier ones. However, the are special circumstances such as
+ very long-lived connections from scanning appliances where this is not the
+ best strategy. In such cases, queue_only_load_latch should be set false. */
+
+ if ( !(local_queue_only = session_local_queue_only)
+ && queue_only_load >= 0
+ && (local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load)
+ )
+ {
+ queue_only_reason = 3;
+ if (queue_only_load_latch) session_local_queue_only = TRUE;
}
/* Log the queueing here, when it will get a message id attached, but
if (local_queue_only) switch(queue_only_reason)
{
- case 1:
- log_write(L_delay_delivery,
+ case 1: log_write(L_delay_delivery,
LOG_MAIN, "no immediate delivery: too many connections "
"(%d, max %d)", smtp_accept_count, smtp_accept_queue);
- break;
+ break;
- case 2:
- log_write(L_delay_delivery,
+ case 2: log_write(L_delay_delivery,
LOG_MAIN, "no immediate delivery: more than %d messages "
"received in one connection", smtp_accept_queue_per_connection);
- break;
+ break;
- case 3:
- log_write(L_delay_delivery,
+ case 3: log_write(L_delay_delivery,
LOG_MAIN, "no immediate delivery: load average %.2f",
(double)load_average/1000.0);
- break;
+ break;
}
/* If a delivery attempt is required, spin off a new process to handle it.
If we are not root, we have to re-exec exim unless deliveries are being
done unprivileged. */
- else if (!queue_only_policy && !deliver_freeze)
+ else if (!f.queue_only_policy && !f.deliver_freeze)
{
pid_t dpid;
if ((dpid = fork()) == 0)
{
- fclose(smtp_in);
- fclose(smtp_out);
+ (void)fclose(smtp_in);
+ (void)fclose(smtp_out);
/* Don't ever molest the parent's SSL connection, but do clean up
the data structures if necessary. */
- #ifdef SUPPORT_TLS
- tls_close(FALSE);
- #endif
+#ifndef DISABLE_TLS
+ tls_close(NULL, TLS_NO_SHUTDOWN);
+#endif
/* Reset SIGHUP and SIGCHLD in the child in both cases. */
if (geteuid() != root_uid && !deliver_drop_privilege)
{
signal(SIGALRM, SIG_DFL);
- (void)child_exec_exim(CEE_EXEC_PANIC, FALSE, NULL, FALSE, 2, US"-Mc",
- message_id);
+ delivery_re_exec(CEE_EXEC_PANIC);
/* Control does not return here. */
}
/* No need to re-exec; SIGALRM remains set to the default handler */
- (void)deliver_message(message_id, FALSE, FALSE);
+ (void) deliver_message(message_id, FALSE, FALSE);
search_tidyup();
- _exit(EXIT_SUCCESS);
+ exim_underbar_exit(EXIT_SUCCESS);
}
if (dpid > 0)
{
+ release_cutthrough_connection(US"passed for delivery");
DEBUG(D_any) debug_printf("forked delivery process %d\n", (int)dpid);
}
else
- {
+ {
+ cancel_cutthrough_connection(TRUE, US"delivery fork failed");
log_write(0, LOG_MAIN|LOG_PANIC, "daemon: delivery process fork "
"failed: %s", strerror(errno));
- }
+ }
}
}
}
remember the pid for ticking off when the child completes. */
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 */
/* Close the streams associated with the socket which will also close the
socket fds in this process. We can't do anything if fclose() fails, but
logging brings it to someone's attention. However, "connection reset by peer"
-isn't really a problem, so skip that one. If the streams don't exist, something
-went wrong while setting things up. Make sure the socket descriptors are
-closed, in order to drop the connection. */
+isn't really a problem, so skip that one. On Solaris, a dropped connection can
+manifest itself as a broken pipe, so drop that one too. If the streams don't
+exist, something went wrong while setting things up. Make sure the socket
+descriptors are closed, in order to drop the connection. */
-if (smtp_out != NULL)
+if (smtp_out)
{
- if (fclose(smtp_out) != 0 && errno != ECONNRESET)
+ if (fclose(smtp_out) != 0 && errno != ECONNRESET && errno != EPIPE)
log_write(0, LOG_MAIN|LOG_PANIC, "daemon: fclose(smtp_out) failed: %s",
strerror(errno));
smtp_out = NULL;
}
-else close(accept_socket);
+else (void)close(accept_socket);
-if (smtp_in != NULL)
+if (smtp_in)
{
- if (fclose(smtp_in) != 0 && errno != ECONNRESET)
+ if (fclose(smtp_in) != 0 && errno != ECONNRESET && errno != EPIPE)
log_write(0, LOG_MAIN|LOG_PANIC, "daemon: fclose(smtp_in) failed: %s",
strerror(errno));
smtp_in = NULL;
}
-else close(dup_accept_socket);
+else (void)close(dup_accept_socket);
/* Release any store used in this process, including the store used for holding
the incoming host address and an expanded active_hostname. */
+log_close_all();
+interface_address =
+sender_host_address = NULL;
store_reset(reset_point);
sender_host_address = NULL;
}
+/*************************************************
+* Handle terminating subprocesses *
+*************************************************/
+
+/* Handle the termination of child processes. Theoretically, this need be done
+only when sigchld_seen is TRUE, but rumour has it that some systems lose
+SIGCHLD signals at busy times, so to be on the safe side, this function is
+called each time round. It shouldn't be too expensive.
+
+Arguments: none
+Returns: nothing
+*/
+
+static void
+handle_ending_processes(void)
+{
+int status;
+pid_t pid;
+
+while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
+ {
+ DEBUG(D_any)
+ {
+ debug_printf("child %d ended: status=0x%x\n", (int)pid, status);
+#ifdef WCOREDUMP
+ if (WIFEXITED(status))
+ debug_printf(" normal exit, %d\n", WEXITSTATUS(status));
+ else if (WIFSIGNALED(status))
+ debug_printf(" signal exit, signal %d%s\n", WTERMSIG(status),
+ WCOREDUMP(status) ? " (core dumped)" : "");
+#endif
+ }
+
+ /* If it's a listening daemon for which we are keeping track of individual
+ subprocesses, deal with an accepting process that has terminated. */
+
+ if (smtp_slots)
+ {
+ int i;
+ for (i = 0; i < smtp_accept_max; i++)
+ if (smtp_slots[i].pid == pid)
+ {
+ if (smtp_slots[i].host_address)
+ store_free(smtp_slots[i].host_address);
+ smtp_slots[i] = empty_smtp_slot;
+ if (--smtp_accept_count < 0) smtp_accept_count = 0;
+ DEBUG(D_any) debug_printf("%d SMTP accept process%s now running\n",
+ smtp_accept_count, (smtp_accept_count == 1)? "" : "es");
+ break;
+ }
+ if (i < smtp_accept_max) continue; /* Found an accepting process */
+ }
+
+ /* If it wasn't an accepting process, see if it was a queue-runner
+ process that we are tracking. */
+
+ if (queue_pid_slots)
+ {
+ int max = atoi(CS expand_string(queue_run_max));
+ for (int i = 0; i < max; i++)
+ if (queue_pid_slots[i] == pid)
+ {
+ queue_pid_slots[i] = 0;
+ if (--queue_run_count < 0) queue_run_count = 0;
+ DEBUG(D_any) debug_printf("%d queue-runner process%s now running\n",
+ queue_run_count, (queue_run_count == 1)? "" : "es");
+ break;
+ }
+ }
+ }
+}
+
/*************************************************
void
daemon_go(void)
{
+struct passwd *pw;
int *listen_sockets = NULL;
int listen_socket_count = 0;
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));
/* If any debugging options are set, turn on the D_pid bit so that all
debugging lines get the pid added. */
DEBUG(D_any|D_v) debug_selector |= D_pid;
+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;
+ (void) close(0);
+ (void) close(1);
+ (void) close(2);
+ exim_nullstd();
+
+ if (debug_file == stderr)
+ {
+ /* need a call to log_write before call to open debug_file, so that
+ log.c:file_path has been initialised. This is unfortunate. */
+ log_write(0, LOG_MAIN, "debugging Exim in inetd wait mode starting");
+
+ fclose(debug_file);
+ debug_file = NULL;
+ exim_nullstd(); /* re-open fd2 after we just closed it again */
+ debug_logging_activate(US"-wait", NULL);
+ }
+
+ DEBUG(D_any) debug_printf("running in inetd wait mode\n");
+
+ /* As per below, when creating sockets ourselves, we handle tcp_nodelay for
+ our own buffering; we assume though that inetd set the socket REUSEADDR. */
+
+ if (tcp_nodelay)
+ 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));
+ }
+
+
+if (f.inetd_wait_mode || f.daemon_listen)
+ {
+ /* If any option requiring a load average to be available during the
+ reception of a message is set, call os_getloadavg() while we are root
+ for those OS for which this is necessary the first time it is called (in
+ order to perform an "open" on the kernel memory file). */
+
+ #ifdef LOAD_AVG_NEEDS_ROOT
+ if (queue_only_load >= 0 || smtp_load_reserve >= 0 ||
+ (deliver_queue_load_max >= 0 && deliver_drop_privilege))
+ (void)os_getloadavg();
+ #endif
+ }
+
/* Do the preparation for setting up a listener on one or more interfaces, and
possible on various ports. This is controlled by the combination of
first, so that we can return non-zero if there are any syntax errors, and also
write to stderr. */
-if (daemon_listen)
+if (f.daemon_listen && !f.inetd_wait_mode)
{
int *default_smtp_port;
int sep;
int pct = 0;
uschar *s;
- uschar *list;
+ const uschar * list;
uschar *local_iface_source = US"local_interfaces";
ip_address_item *ipa;
ip_address_item **pipa;
- /* If any option requiring a load average to be available during the
- reception of a message is set, call os_getloadavg() while we are root
- for those OS for which this is necessary the first time it is called (in
- order to perform an "open" on the kernel memory file). */
-
- #ifdef LOAD_AVG_NEEDS_ROOT
- if (queue_only_load >= 0 || smtp_load_reserve >= 0) (void)os_getloadavg();
- #endif
-
/* If -oX was used, disable the writing of a pid file unless -oP was
explicitly used to force it. Then scan the string given to -oX. Any items
that contain neither a dot nor a colon are used to override daemon_smtp_port.
Any other items are used to override local_interfaces. */
- if (override_local_interfaces != NULL)
+ if (override_local_interfaces)
{
- uschar *new_smtp_port = NULL;
- uschar *new_local_interfaces = NULL;
- int portsize = 0;
- int portptr = 0;
- int ifacesize = 0;
- int ifaceptr = 0;
+ gstring * new_smtp_port = NULL;
+ gstring * new_local_interfaces = NULL;
if (override_pid_file_path == NULL) write_pid = FALSE;
list = override_local_interfaces;
sep = 0;
- while ((s = string_nextinlist(&list,&sep,big_buffer,big_buffer_size))
- != NULL)
+ while ((s = string_nextinlist(&list, &sep, big_buffer, big_buffer_size)))
{
uschar joinstr[4];
- uschar **ptr;
- int *sizeptr;
- int *ptrptr;
+ gstring ** gp;
if (Ustrpbrk(s, ".:") == NULL)
- {
- ptr = &new_smtp_port;
- sizeptr = &portsize;
- ptrptr = &portptr;
- }
+ gp = &new_smtp_port;
else
- {
- ptr = &new_local_interfaces;
- sizeptr = &ifacesize;
- ptrptr = &ifaceptr;
- }
+ gp = &new_local_interfaces;
- if (*ptr == NULL)
+ if (!*gp)
{
joinstr[0] = sep;
joinstr[1] = ' ';
- *ptr = string_cat(*ptr, sizeptr, ptrptr, US"<", 1);
+ *gp = string_catn(*gp, US"<", 1);
}
- *ptr = string_cat(*ptr, sizeptr, ptrptr, joinstr, 2);
- *ptr = string_cat(*ptr, sizeptr, ptrptr, s, Ustrlen(s));
+ *gp = string_catn(*gp, joinstr, 2);
+ *gp = string_cat (*gp, s);
}
- if (new_smtp_port != NULL)
+ if (new_smtp_port)
{
- new_smtp_port[portptr] = 0;
- daemon_smtp_port = new_smtp_port;
+ daemon_smtp_port = string_from_gstring(new_smtp_port);
DEBUG(D_any) debug_printf("daemon_smtp_port overridden by -oX:\n %s\n",
daemon_smtp_port);
}
- if (new_local_interfaces != NULL)
+ if (new_local_interfaces)
{
- new_local_interfaces[ifaceptr] = 0;
- local_interfaces = new_local_interfaces;
+ local_interfaces = string_from_gstring(new_local_interfaces);
local_iface_source = US"-oX data";
DEBUG(D_any) debug_printf("local_interfaces overridden by -oX:\n %s\n",
local_interfaces);
}
/* Create a list of default SMTP ports, to be used if local_interfaces
- contains entries without explict ports. First count the number of ports, then
+ contains entries without explicit ports. First count the number of ports, then
build a translated list in a vector. */
list = daemon_smtp_port;
sep = 0;
- while ((s = string_nextinlist(&list,&sep,big_buffer,big_buffer_size)) != NULL)
+ 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;
- (s = string_nextinlist(&list,&sep,big_buffer,big_buffer_size)) != NULL;
+ (s = string_nextinlist(&list, &sep, big_buffer, big_buffer_size));
pct++)
{
if (isdigit(*s))
else
{
struct servent *smtp_service = getservbyname(CS s, "tcp");
- if (smtp_service == NULL)
+ if (!smtp_service)
log_write(0, LOG_PANIC_DIE|LOG_CONFIG, "TCP port \"%s\" not found", s);
default_smtp_port[pct] = ntohs(smtp_service->s_port);
}
}
default_smtp_port[pct] = 0;
+ /* Check the list of TLS-on-connect ports and do name lookups if needed */
+
+ list = tls_in.on_connect_ports;
+ sep = 0;
+ while ((s = string_nextinlist(&list, &sep, big_buffer, big_buffer_size)))
+ if (!isdigit(*s))
+ {
+ gstring * g = NULL;
+
+ list = tls_in.on_connect_ports;
+ tls_in.on_connect_ports = NULL;
+ sep = 0;
+ while ((s = string_nextinlist(&list, &sep, big_buffer, big_buffer_size)))
+ {
+ if (!isdigit(*s))
+ {
+ struct servent * smtp_service = getservbyname(CS s, "tcp");
+ if (!smtp_service)
+ log_write(0, LOG_PANIC_DIE|LOG_CONFIG, "TCP port \"%s\" not found", s);
+ s = string_sprintf("%d", (int)ntohs(smtp_service->s_port));
+ }
+ g = string_append_listele(g, ':', s);
+ }
+ if (g)
+ tls_in.on_connect_ports = g->s;
+ break;
+ }
+
/* Create the list of local interfaces, possibly with ports included. This
list may contain references to 0.0.0.0 and ::0 as wildcards. These special
values are converted below. */
In the same scan, fill in missing port numbers from the default list. When
there is more than one item in the list, extra items are created. */
- for (ipa = addresses; ipa != NULL; ipa = ipa->next)
+ for (ipa = addresses; ipa; ipa = ipa->next)
{
- int i;
-
- if (Ustrcmp(ipa->address, "0.0.0.0") == 0) ipa->address[0] = 0;
+ if (Ustrcmp(ipa->address, "0.0.0.0") == 0)
+ ipa->address[0] = 0;
else if (Ustrcmp(ipa->address, "::0") == 0)
{
ipa->address[0] = ':';
if (daemon_smtp_port[0] <= 0)
log_write(0, LOG_MAIN|LOG_PANIC_DIE, "no port specified for interface "
"%s and daemon_smtp_port is unset; cannot start daemon",
- (ipa->address[0] == 0)? US"\"all IPv4\"" :
- (ipa->address[1] == 0)? US"\"all IPv6\"" : ipa->address);
+ ipa->address[0] == 0 ? US"\"all IPv4\"" :
+ 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];
new->next = ipa->next;
also simplifies the construction of the "daemon started" log line. */
pipa = &addresses;
- for (ipa = addresses; ipa != NULL; pipa = &(ipa->next), ipa = ipa->next)
+ for (ipa = addresses; ipa; pipa = &ipa->next, ipa = ipa->next)
{
ip_address_item *ipa2;
/* Handle an IPv4 wildcard */
if (ipa->address[0] == 0)
- {
- for (ipa2 = ipa; ipa2->next != NULL; ipa2 = ipa2->next)
+ for (ipa2 = ipa; ipa2->next; ipa2 = ipa2->next)
{
ip_address_item *ipa3 = ipa2->next;
if (ipa3->address[0] == ':' &&
break;
}
}
- }
/* Handle an IPv6 wildcard. */
else if (ipa->address[0] == ':' && ipa->address[1] == 0)
- {
- for (ipa2 = ipa; ipa2->next != NULL; ipa2 = ipa2->next)
+ for (ipa2 = ipa; ipa2->next; ipa2 = ipa2->next)
{
ip_address_item *ipa3 = ipa2->next;
if (ipa3->address[0] == 0 && ipa3->port == ipa->port)
break;
}
}
- }
}
/* Get a vector to remember all the sockets in */
- for (ipa = addresses; ipa != NULL; ipa = ipa->next)
+ 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 */
+
+if (f.daemon_listen)
+ {
/* Do a sanity check on the max connects value just to save us from getting
a huge amount of store. */
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;
}
}
-/* We now close all open file descriptors that we know about, and disconnect
-from the controlling terminal, unless background_daemon is unset. This is
-always unset when debugging, but can also be forced. Most modern Unixes seem to
-have setsid() for getting rid of the controlling terminal. For any OS that
-doesn't, setsid() can be #defined as a no-op, or as something else. */
+/* The variable background_daemon is always false when debugging, but
+can also be forced false in order to keep a non-debugging daemon in the
+foreground. If background_daemon is true, close all open file descriptors that
+we know about, but then re-open stdin, stdout, and stderr to /dev/null. Also
+do this for inetd_wait mode.
+
+This is protection against any called functions (in libraries, or in
+Perl, or whatever) that think they can write to stderr (or stdout). Before this
+was added, it was quite likely that an SMTP connection would use one of these
+file descriptors, in which case writing random stuff to it caused chaos.
+
+Then disconnect from the controlling terminal, Most modern Unixes seem to have
+setsid() for getting rid of the controlling terminal. For any OS that doesn't,
+setsid() can be #defined as a no-op, or as something else. */
-if (background_daemon)
+if (f.background_daemon || f.inetd_wait_mode)
{
- log_close_all(); /* Just in case anything was logged earlier */
- search_tidyup(); /* Just in case any were used in reading the config. */
- close(0); /* Get rid of stdin/stdout/stderr */
- close(1);
- close(2);
+ log_close_all(); /* Just in case anything was logged earlier */
+ search_tidyup(); /* Just in case any were used in reading the config. */
+ (void)close(0); /* Get rid of stdin/stdout/stderr */
+ (void)close(1);
+ (void)close(2);
+ exim_nullstd(); /* Connect stdin/stdout/stderr to /dev/null */
log_stderr = NULL; /* So no attempt to copy paniclog output */
+ }
+if (f.background_daemon)
+ {
/* If the parent process of this one has pid == 1, we are re-initializing the
- daemon as the result of a SIGHUP. In this case, there is no need to do any
- forking, because the controlling terminal has long gone. Otherwise, fork,
- in case current process is a process group leader (see 'man setsid' for an
- explanation). */
+ 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(). */
if (getppid() != 1)
{
/* We are now in the disconnected, daemon process (unless debugging). Set up
the listening sockets if required. */
-if (daemon_listen)
+if (f.daemon_listen && !f.inetd_wait_mode)
{
int sk;
- int on = 1;
ip_address_item *ipa;
/* For each IP address, create a socket, bind it to the appropriate port, and
{
BOOL wildcard;
ip_address_item *ipa2;
- int retries = 9;
int af;
if (Ustrchr(ipa->address, ':') != NULL)
wildcard = ipa->address[0] == 0;
}
- listen_sockets[sk] = ip_socket(SOCK_STREAM, af);
- if (listen_sockets[sk] < 0)
+ if ((listen_sockets[sk] = ip_socket(SOCK_STREAM, af)) < 0)
{
if (check_special_case(0, addresses, ipa, FALSE))
{
available. Just log failure (can get protocol not available, just like
socket creation can). */
- #ifdef IPV6_V6ONLY
+#ifdef IPV6_V6ONLY
if (af == AF_INET6 && wildcard &&
- setsockopt(listen_sockets[sk], IPPROTO_IPV6, IPV6_V6ONLY, (char *)(&on),
+ setsockopt(listen_sockets[sk], IPPROTO_IPV6, IPV6_V6ONLY, CS (&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 */
+#endif /* IPV6_V6ONLY */
/* Set SO_REUSEADDR so that the daemon can be restarted while a connection
is being handled. Without this, a connection will prevent reuse of the
smtp port for listening. */
if (setsockopt(listen_sockets[sk], SOL_SOCKET, SO_REUSEADDR,
- (uschar *)(&on), sizeof(on)) < 0)
+ US (&on), sizeof(on)) < 0)
log_write(0, LOG_MAIN|LOG_PANIC_DIE, "setting SO_REUSEADDR on socket "
"failed when starting daemon: %s", strerror(errno));
disable this because it breaks some broken clients. */
if (tcp_nodelay) setsockopt(listen_sockets[sk], IPPROTO_TCP, TCP_NODELAY,
- (uschar *)(&on), sizeof(on));
+ US (&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
necessary for (some release of) USAGI Linux; other IP stacks fail at the
listen() stage instead. */
+#ifdef TCP_FASTOPEN
+ f.tcp_fastopen_ok = TRUE;
+#endif
for(;;)
{
uschar *msg, *addr;
{
DEBUG(D_any) debug_printf("wildcard IPv4 bind() failed after IPv6 "
"listen() success; EADDRINUSE ignored\n");
- close(listen_sockets[sk]);
+ (void)close(listen_sockets[sk]);
goto SKIP_SOCKET;
}
msg = US strerror(errno);
- addr = wildcard? ((af == AF_INET6)? US"(any IPv6)" : US"(any IPv4)") :
- ipa->address;
- if (retries-- <= 0)
+ addr = wildcard
+ ? af == AF_INET6
+ ? US"(any IPv6)"
+ : US"(any IPv4)"
+ : ipa->address;
+ if (daemon_startup_retries <= 0)
log_write(0, LOG_MAIN|LOG_PANIC_DIE,
"socket bind() to port %d for address %s failed: %s: "
"daemon abandoned", ipa->port, addr, msg);
log_write(0, LOG_MAIN, "socket bind() to port %d for address %s "
- "failed: %s: waiting before trying again", ipa->port, addr, msg);
- sleep(30);
+ "failed: %s: waiting %s before trying again (%d more %s)",
+ ipa->port, addr, msg, readconf_printtime(daemon_startup_sleep),
+ daemon_startup_retries, (daemon_startup_retries > 1)? "tries" : "try");
+ daemon_startup_retries--;
+ sleep(daemon_startup_sleep);
}
DEBUG(D_any)
- {
if (wildcard)
debug_printf("listening on all interfaces (IPv%c) port %d\n",
- (af == AF_INET6)? '6' : '4', ipa->port);
+ af == AF_INET6 ? '6' : '4', ipa->port);
else
debug_printf("listening on %s port %d\n", ipa->address, ipa->port);
+
+#if defined(TCP_FASTOPEN) && !defined(__APPLE__)
+ if ( f.tcp_fastopen_ok
+ && setsockopt(listen_sockets[sk], IPPROTO_TCP, TCP_FASTOPEN,
+ &smtp_connect_backlog, sizeof(smtp_connect_backlog)))
+ {
+ DEBUG(D_any) debug_printf("setsockopt FASTOPEN: %s\n", strerror(errno));
+ f.tcp_fastopen_ok = FALSE;
}
+#endif
/* Start listening on the bound socket, establishing the maximum backlog of
connections that is allowed. On success, continue to the next address. */
- if (listen(listen_sockets[sk], smtp_connect_backlog) >= 0) continue;
+ if (listen(listen_sockets[sk], smtp_connect_backlog) >= 0)
+ {
+#if defined(TCP_FASTOPEN) && defined(__APPLE__)
+ if ( f.tcp_fastopen_ok
+ && setsockopt(listen_sockets[sk], IPPROTO_TCP, TCP_FASTOPEN,
+ &on, sizeof(on)))
+ {
+ DEBUG(D_any) debug_printf("setsockopt FASTOPEN: %s\n", strerror(errno));
+ f.tcp_fastopen_ok = FALSE;
+ }
+#endif
+ continue;
+ }
/* Listening has failed. In an IPv6 environment, as for bind(), if listen()
fails with the error EADDRINUSE and we are doing IPv4 wildcard listening
if (!check_special_case(errno, addresses, ipa, TRUE))
log_write(0, LOG_PANIC_DIE, "listen() failed on interface %s: %s",
- wildcard? ((af == AF_INET6)? US"(any IPv6)" : US"(any IPv4)") :
- ipa->address,
+ wildcard
+ ? af == AF_INET6 ? US"(any IPv6)" : US"(any IPv4)" : ipa->address,
strerror(errno));
DEBUG(D_any) debug_printf("wildcard IPv4 listen() failed after IPv6 "
"listen() success; EADDRINUSE ignored\n");
- close(listen_sockets[sk]);
+ (void)close(listen_sockets[sk]);
/* Come here if there has been a problem with the socket which we
are going to ignore. We remove the address from the chain, and back up the
counts. */
- SKIP_SOCKET:
+ SKIP_SOCKET:
sk--; /* Back up the count */
listen_socket_count--; /* Reduce the total */
if (ipa == addresses) addresses = ipa->next; else
/* If we are not listening, we want to write a pid file only if -oP was
explicitly given. */
-else if (override_pid_file_path == NULL) write_pid = FALSE;
+else if (!override_pid_file_path)
+ write_pid = FALSE;
/* Write the pid to a known file for assistance in identification, if required.
We do this before giving up root privilege, because on some systems it is
The variable daemon_write_pid is used to control this. */
-if (running_in_test_harness || write_pid)
+if (f.running_in_test_harness || write_pid)
{
FILE *f;
- if (override_pid_file_path != NULL)
+ 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);
- f = Ufopen(pid_file_path, "wb");
- if (f != NULL)
+ if ((f = modefopen(pid_file_path, "wb", 0644)))
{
- fprintf(f, "%d\n", (int)getpid());
- fchmod(fileno(f), 0644);
- fclose(f);
+ (void)fprintf(f, "%d\n", (int)getpid());
+ (void)fclose(f);
DEBUG(D_any) debug_printf("pid written to %s\n", pid_file_path);
}
else
- {
DEBUG(D_any)
debug_printf("%s\n", string_open_failed(errno, "pid file %s",
pid_file_path));
- }
}
/* Set up the handler for SIGHUP, which causes a restart of the daemon. */
exim_setugid(exim_uid, exim_gid, geteuid()==root_uid, US"running as a daemon");
+/* Update the originator_xxx fields so that received messages as listed as
+coming from Exim, not whoever started the daemon. */
+
+originator_uid = exim_uid;
+originator_gid = exim_gid;
+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 && queue_run_max > 0)
+if (queue_interval > 0 && local_queue_run_max > 0)
{
- int i;
- queue_pid_slots = store_get(queue_run_max * sizeof(pid_t));
- for (i = 0; i < 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. */
sigchld_seen = FALSE;
-signal(SIGCHLD, main_sigchld_handler);
+os_non_restarting_signal(SIGCHLD, main_sigchld_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. */
/* Log the start up of a daemon - at least one of listening or queue running
must be set up. */
-if (daemon_listen)
+if (f.inetd_wait_mode)
+ {
+ uschar *p = big_buffer;
+
+ if (inetd_wait_timeout >= 0)
+ sprintf(CS p, "terminating after %d seconds", inetd_wait_timeout);
+ else
+ sprintf(CS p, "with no wait timeout");
+
+ log_write(0, LOG_MAIN,
+ "exim %s daemon started: pid=%d, launched with listening socket, %s",
+ version_string, getpid(), big_buffer);
+ set_process_info("daemon(%s): pre-listening socket", version_string);
+
+ /* set up the timeout logic */
+ sigalrm_seen = 1;
+ }
+
+else if (f.daemon_listen)
{
- int i, j;
int smtp_ports = 0;
int smtps_ports = 0;
- ip_address_item *ipa;
- uschar *p = big_buffer;
- uschar *qinfo = (queue_interval > 0)?
- string_sprintf("-q%s", readconf_printtime(queue_interval))
- :
- US"no queue runs";
+ ip_address_item * ipa;
+ uschar * p;
+ uschar * qinfo = queue_interval > 0
+ ? string_sprintf("-q%s", readconf_printtime(queue_interval))
+ : US"no queue runs";
/* Build a list of listening addresses in big_buffer, but limit it to 10
items. The style is for backwards compatibility.
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 != NULL; 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. */
-
- 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;
- }
- }
- else
- {
- if (smtps_ports++ == 0)
- {
- (void)sprintf(CS p, "%sSMTPS on",
- (smtp_ports == 0)? "":" and for ");
- while (*p != 0) p++;
- }
- }
-
- /* Now the information about the port (and sometimes interface) */
-
- if (ipa->address[0] == ':' && ipa->address[1] == 0)
- {
- if (ipa->next != NULL && ipa->next->address[0] == 0 &&
- ipa->next->port == ipa->port)
- {
- (void)sprintf(CS p, " port %d (IPv6 and IPv4)", ipa->port);
- ipa = ipa->next;
- }
- else if (ipa->v6_include_v4)
- (void)sprintf(CS p, " port %d (IPv6 with IPv4)", ipa->port);
- else
- (void)sprintf(CS p, " port %d (IPv6)", ipa->port);
- }
- else if (ipa->address[0] == 0)
- (void)sprintf(CS p, " port %d (IPv4)", ipa->port);
- else
- (void)sprintf(CS p, " [%s]:%d", ipa->address, ipa->port);
- while (*p != 0) p++;
- }
- }
-
- if (ipa != NULL)
+ for (i = 0, ipa = addresses; i < 10 && ipa; i++, ipa = ipa->next)
{
- memcpy(p, " ...", 5);
- p += 4;
+ /* First time round, look for SMTP ports; second time round, look for
+ SMTPS ports. Build IP+port strings. */
+
+ if (host_is_tls_on_connect_port(ipa->port) == (j > 0))
+ {
+ if (j == 0)
+ smtp_ports++;
+ else
+ smtps_ports++;
+
+ /* Now the information about the port (and sometimes interface) */
+
+ if (ipa->address[0] == ':' && ipa->address[1] == 0)
+ { /* v6 wildcard */
+ if (ipa->next && ipa->next->address[0] == 0 &&
+ ipa->next->port == ipa->port)
+ {
+ ipa->log = string_sprintf(" port %d (IPv6 and IPv4)", ipa->port);
+ (ipa = ipa->next)->log = NULL;
+ }
+ else if (ipa->v6_include_v4)
+ ipa->log = string_sprintf(" port %d (IPv6 with IPv4)", ipa->port);
+ else
+ ipa->log = string_sprintf(" port %d (IPv6)", ipa->port);
+ }
+ else if (ipa->address[0] == 0) /* v4 wildcard */
+ 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 */
+ 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 */
+ ipa->log = string_sprintf(" [%s]:%d", ipa->address, ipa->port);
+ }
+ }
}
}
+ 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)
+ {
+ 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,
"exim %s daemon started: pid=%d, %s, listening for %s",
version_string, getpid(), qinfo, big_buffer);
- set_process_info("daemon: %s, listening for %s", qinfo, big_buffer);
+ set_process_info("daemon(%s): %s, listening for %s",
+ version_string, qinfo, big_buffer);
}
else
{
+ uschar * s = *queue_name
+ ? string_sprintf("-qG%s/%s", queue_name, readconf_printtime(queue_interval))
+ : string_sprintf("-q%s", readconf_printtime(queue_interval));
log_write(0, LOG_MAIN,
- "exim %s daemon started: pid=%d, -q%s, not listening for SMTP",
- version_string, getpid(), readconf_printtime(queue_interval));
- set_process_info("daemon: -q%s, not listening",
- readconf_printtime(queue_interval));
+ "exim %s daemon started: pid=%d, %s, not listening for SMTP",
+ version_string, getpid(), s);
+ set_process_info("daemon(%s): %s, not listening", version_string, s);
+ }
+
+/* Do any work it might be useful to amortize over our children
+(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
smtp_input = TRUE;
+#ifdef MEASURE_TIMING
+report_time_since(×tamp_startup, US"daemon loop start"); /* testcase 0022 */
+#endif
+
/* Enter the never-ending loop... */
for (;;)
struct sockaddr_in accepted;
#endif
- SOCKLEN_T len = sizeof(accepted);
- int status;
+ EXIM_SOCKLEN_T len;
pid_t pid;
/* This code is placed first in the loop, so that it gets obeyed at the
- start, before the first wait. This causes the first queue-runner to be
- started immediately. */
+ start, before the first wait, for the queue-runner case, so that the first
+ one can be started immediately.
+
+ The other option is that we have an inetd wait timeout specified to -bw. */
if (sigalrm_seen)
{
- DEBUG(D_any) debug_printf("SIGALRM received\n");
+ if (inetd_wait_timeout > 0)
+ {
+ time_t resignal_interval = inetd_wait_timeout;
- /* 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 (last_connection_time == (time_t)0)
+ {
+ DEBUG(D_any)
+ debug_printf("inetd wait timeout expired, but still not seen first message, ignoring\n");
+ }
+ else
+ {
+ time_t now = time(NULL);
+ if (now == (time_t)-1)
+ {
+ DEBUG(D_any) debug_printf("failed to get time: %s\n", strerror(errno));
+ }
+ else
+ {
+ if ((now - last_connection_time) >= inetd_wait_timeout)
+ {
+ DEBUG(D_any)
+ debug_printf("inetd wait timeout %d expired, ending daemon\n",
+ inetd_wait_timeout);
+ log_write(0, LOG_MAIN, "exim %s daemon terminating, inetd wait timeout reached.\n",
+ version_string);
+ exit(EXIT_SUCCESS);
+ }
+ else
+ {
+ resignal_interval -= (now - last_connection_time);
+ }
+ }
+ }
+
+ sigalrm_seen = FALSE;
+ ALARM(resignal_interval);
+ }
- if (queue_interval > 0 &&
- (queue_run_max <= 0 || queue_run_count < queue_run_max))
+ else
{
- if ((pid = fork()) == 0)
- {
- int sk;
- DEBUG(D_any) debug_printf("Starting queue-runner: pid %d\n",
- (int)getpid());
+ DEBUG(D_any) debug_printf("SIGALRM received\n");
- /* Close any open listening sockets in the child */
+ /* 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. */
- for (sk = 0; sk < listen_socket_count; sk++) close(listen_sockets[sk]);
+ if (queue_interval > 0 &&
+ (local_queue_run_max <= 0 || queue_run_count < local_queue_run_max))
+ {
+ if ((pid = fork()) == 0)
+ {
+ DEBUG(D_any) debug_printf("Starting queue-runner: pid %d\n",
+ (int)getpid());
- /* Reset SIGHUP and SIGCHLD in the child in both cases. */
+ /* 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. */
- signal(SIGHUP, SIG_DFL);
- signal(SIGCHLD, SIG_DFL);
+ if (f.debug_daemon) debug_selector = 0;
- /* Re-exec if privilege has been given up, unless deliver_drop_
- privilege is set. Reset SIGALRM before exec(). */
+ /* Close any open listening sockets in the child */
- if (geteuid() != root_uid && !deliver_drop_privilege)
- {
- uschar opt[8];
- uschar *p = opt;
+ for (int sk = 0; sk < listen_socket_count; sk++)
+ (void)close(listen_sockets[sk]);
- signal(SIGALRM, SIG_DFL);
- *p++ = '-';
- *p++ = 'q';
- if (queue_2stage) *p++ = 'q';
- if (queue_run_first_delivery) *p++ = 'i';
- if (queue_run_force) *p++ = 'f';
- if (deliver_force_thaw) *p++ = 'f';
- if (queue_run_local) *p++ = 'l';
- *p = 0;
-
- (void)child_exec_exim(CEE_EXEC_PANIC, FALSE, NULL, TRUE, 1, opt);
- /* Control never returns here. */
- }
+ /* Reset SIGHUP and SIGCHLD in the child in both cases. */
- /* No need to re-exec; SIGALRM remains set to the default handler */
+ signal(SIGHUP, SIG_DFL);
+ signal(SIGCHLD, SIG_DFL);
- queue_run(NULL, NULL, FALSE);
- _exit(EXIT_SUCCESS);
- }
+ /* Re-exec if privilege has been given up, unless deliver_drop_
+ privilege is set. Reset SIGALRM before exec(). */
- if (pid < 0)
- {
- log_write(0, LOG_MAIN|LOG_PANIC, "daemon: fork of queue-runner "
- "process failed: %s", strerror(errno));
- log_close_all();
- }
- else
- {
- int i;
- for (i = 0; i < queue_run_max; ++i)
- {
- if (queue_pid_slots[i] <= 0)
+ if (geteuid() != root_uid && !deliver_drop_privilege)
{
- queue_pid_slots[i] = pid;
- queue_run_count++;
- break;
+ uschar opt[8];
+ uschar *p = opt;
+ uschar *extra[5];
+ int extracount = 1;
+
+ signal(SIGALRM, SIG_DFL);
+ *p++ = '-';
+ *p++ = 'q';
+ if (f.queue_2stage) *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
+ ? string_sprintf("%sG%s", opt, queue_name) : opt;
+
+ /* If -R or -S were on the original command line, ensure they get
+ passed on. */
+
+ if (deliver_selectstring)
+ {
+ extra[extracount++] = f.deliver_selectstring_regex ? US"-Rr" : US"-R";
+ extra[extracount++] = deliver_selectstring;
+ }
+
+ if (deliver_selectstring_sender)
+ {
+ extra[extracount++] = f.deliver_selectstring_sender_regex
+ ? US"-Sr" : US"-S";
+ extra[extracount++] = deliver_selectstring_sender;
+ }
+
+ /* 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]);
+
+ /* Control never returns here. */
}
+
+ /* No need to re-exec; SIGALRM remains set to the default handler */
+
+ queue_run(NULL, NULL, FALSE);
+ exim_underbar_exit(EXIT_SUCCESS);
+ }
+
+ if (pid < 0)
+ {
+ log_write(0, LOG_MAIN|LOG_PANIC, "daemon: fork of queue-runner "
+ "process failed: %s", strerror(errno));
+ log_close_all();
+ }
+ else
+ {
+ for (int i = 0; i < local_queue_run_max; ++i)
+ if (queue_pid_slots[i] <= 0)
+ {
+ queue_pid_slots[i] = pid;
+ queue_run_count++;
+ break;
+ }
+ DEBUG(D_any) debug_printf("%d queue-runner process%s running\n",
+ queue_run_count, queue_run_count == 1 ? "" : "es");
}
- DEBUG(D_any) debug_printf("%d queue-runner process%s running\n",
- queue_run_count, (queue_run_count == 1)? "" : "es");
}
- }
- /* Reset the alarm clock */
+ /* Reset the alarm clock */
- sigalrm_seen = FALSE;
- alarm(queue_interval);
- }
+ sigalrm_seen = FALSE;
+ ALARM(queue_interval);
+ }
+
+ } /* sigalrm_seen */
/* Sleep till a connection happens if listening, and handle the connection if
new OS. In fact, the later addition of listening on specific interfaces only
requires this way of working anyway. */
- if (daemon_listen)
+ if (f.daemon_listen)
{
- int sk, lcount;
+ 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++)
+ 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];
DEBUG(D_any) debug_printf("Listening...\n");
- if ((lcount = select(max_socket + 1, (SELECT_ARG2_TYPE *)&select_listen,
- NULL, NULL, NULL)) < 0)
+ /* In rare cases we may have had a SIGCHLD signal in the time between
+ setting the handler (below) and getting back here. If so, pretend that the
+ select() was interrupted so that we reap the child. This might still leave
+ a small window when a SIGCHLD could get lost. However, since we use SIGCHLD
+ only to do the reaping more quickly, it shouldn't result in anything other
+ than a delay until something else causes a wake-up. */
+
+ if (sigchld_seen)
+ {
+ lcount = -1;
+ errno = EINTR;
+ }
+ else
+ lcount = select(max_socket + 1, (SELECT_ARG2_TYPE *)&select_listen,
+ NULL, NULL, NULL);
+
+ if (lcount < 0)
{
select_failed = TRUE;
lcount = 1;
}
+ /* Clean up any subprocesses that may have terminated. We need to do this
+ here so that smtp_accept_max_per_host works when a connection to that host
+ has completed, and we are about to accept a new one. When this code was
+ later in the sequence, a new connection could be rejected, even though an
+ old one had just finished. Preserve the errno from any select() failure for
+ the use of the common select/accept error processing below. */
+
+ select_errno = errno;
+ 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 a flag, so as to use the
- common error code for select/accept below. */
+ 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. */
while (lcount-- > 0)
{
int accept_socket = -1;
+
if (!select_failed)
- {
- for (sk = 0; sk < listen_socket_count; sk++)
- {
+ for (int sk = 0; sk < listen_socket_count; sk++)
if (FD_ISSET(listen_sockets[sk], &select_listen))
{
+ len = sizeof(accepted);
accept_socket = accept(listen_sockets[sk],
(struct sockaddr *)&accepted, &len);
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
/* If select/accept succeeded, deal with the connection. */
if (accept_socket >= 0)
+ {
+ if (inetd_wait_timeout)
+ last_connection_time = time(NULL);
handle_smtp_call(listen_sockets, listen_socket_count, accept_socket,
(struct sockaddr *)&accepted);
+ }
}
}
tv.tv_sec = queue_interval;
tv.tv_usec = 0;
select(0, NULL, NULL, NULL, &tv);
- }
-
- /* Handle the termination of a child process. Theoretically, this need
- be done only when sigchld_seen is TRUE, but rumour has it that some systems
- lose SIGCHLD signals at busy times, so to be on the safe side, just
- do it each time round. It shouldn't be too expensive. */
-
- while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
- {
- int i;
- DEBUG(D_any) debug_printf("child %d ended: status=0x%x\n", (int)pid,
- status);
-
- /* If it's a listening daemon, deal with an accepting process that has
- terminated. */
-
- if (daemon_listen)
- {
- for (i = 0; i < smtp_accept_max; i++)
- {
- if (smtp_slots[i].pid == pid)
- {
- if (smtp_slots[i].host_address != NULL)
- store_free(smtp_slots[i].host_address);
- smtp_slots[i] = empty_smtp_slot;
- if (--smtp_accept_count < 0) smtp_accept_count = 0;
- DEBUG(D_any) debug_printf("%d SMTP accept process%s now running\n",
- smtp_accept_count, (smtp_accept_count == 1)? "" : "es");
- break;
- }
- }
- if (i < smtp_accept_max) continue; /* Found an accepting process */
- }
-
- /* If it wasn't an accepting process, see if it was a queue-runner
- process, if we are keeping track of them. */
-
- if (queue_interval > 0)
- {
- for (i = 0; i < queue_run_max; i++)
- {
- if (queue_pid_slots[i] == pid)
- {
- queue_pid_slots[i] = 0;
- if (--queue_run_count < 0) queue_run_count = 0;
- DEBUG(D_any) debug_printf("%d queue-runner process%s now running\n",
- queue_run_count, (queue_run_count == 1)? "" : "es");
- break;
- }
- }
- }
+ handle_ending_processes();
}
/* Re-enable the SIGCHLD handler if it has been run. It can't do it
if (sigchld_seen)
{
sigchld_seen = FALSE;
- signal(SIGCHLD, main_sigchld_handler);
+ os_non_restarting_signal(SIGCHLD, main_sigchld_handler);
}
/* Handle being woken by SIGHUP. We know at this point that the result
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++) close(listen_sockets[sk]);
- alarm(0);
+ for (int sk = 0; sk < listen_socket_count; sk++)
+ (void)close(listen_sockets[sk]);
+ ALARM_CLR(0);
signal(SIGHUP, SIG_IGN);
sighup_argv[0] = exim_path;
exim_nullstd();
/* Control never reaches here */
}
+/* vi: aw ai sw=2
+*/
/* End of exim_daemon.c */
-
git://git.exim.org / users / jgh / exim.git / blobdiff