* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2016 */
+/* Copyright (c) University of Cambridge 1995 - 2017 */
/* 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 };
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);
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)
+ 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)
{
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)
{
_exit(EXIT_FAILURE);
}
}
- else if (nah[0] != 0) smtp_active_hostname = nah;
+ else if (*nah) smtp_active_hostname = nah;
}
/* Initialize the queueing flags */
search_tidyup(); /* Close cached databases */
if (!ok) /* Connection was dropped */
{
+ cancel_cutthrough_connection(TRUE, US"receive dropped");
mac_smtp_fflush();
smtp_log_no_mail(); /* Log no mail if configured */
_exit(EXIT_SUCCESS);
}
else
{
- mac_smtp_fflush();
+ if (smtp_out)
+ {
+ int i, 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--;
+ }
+ cancel_cutthrough_connection(TRUE, US"message setup dropped");
search_tidyup();
smtp_log_no_mail(); /* Log no mail if configured */
- _exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
+
+ /*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);
}
/* 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++)
/* Reclaim up the store used in accepting this message */
+ return_path = sender_address = NULL;
+ authenticated_sender = NULL;
+ sending_ip_address = NULL;
+ deliver_host_address = deliver_host =
+ deliver_domain_orig = deliver_localpart_orig = NULL;
+ dnslist_domain = dnslist_matched = NULL;
+ callout_address = NULL;
+#ifndef DISABLE_DKIM
+ dkim_cur_signer = NULL;
+#endif
+ acl_var_m = NULL;
store_reset(reset_point);
/* If queue_only is set or if there are too many incoming connections in
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. */
- local_queue_only = session_local_queue_only;
- if (!local_queue_only && queue_only_load >= 0)
+ if ( !(local_queue_only = session_local_queue_only)
+ && queue_only_load >= 0
+ && (local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load)
+ )
{
- local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
- if (local_queue_only)
- {
- queue_only_reason = 3;
- if (queue_only_load_latch) session_local_queue_only = TRUE;
- }
+ 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.
/* Don't ever molest the parent's SSL connection, but do clean up
the data structures if necessary. */
- #ifdef SUPPORT_TLS
+#ifdef SUPPORT_TLS
tls_close(TRUE, FALSE);
- #endif
+#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);
}
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)
- {
if (smtp_slots[i].pid <= 0)
{
smtp_slots[i].pid = pid;
smtp_accept_count++;
break;
}
- }
DEBUG(D_any) debug_printf("%d SMTP accept process%s running\n",
smtp_accept_count, (smtp_accept_count == 1)? "" : "es");
}
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 && errno != EPIPE)
log_write(0, LOG_MAIN|LOG_PANIC, "daemon: fclose(smtp_out) failed: %s",
}
else (void)close(accept_socket);
-if (smtp_in != NULL)
+if (smtp_in)
{
if (fclose(smtp_in) != 0 && errno != ECONNRESET && errno != EPIPE)
log_write(0, LOG_MAIN|LOG_PANIC, "daemon: fclose(smtp_in) failed: %s",
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;
}
/* 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 != NULL)
+ if (smtp_slots)
{
for (i = 0; i < smtp_accept_max; i++)
- {
if (smtp_slots[i].pid == pid)
{
- if (smtp_slots[i].host_address != NULL)
+ 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;
smtp_accept_count, (smtp_accept_count == 1)? "" : "es");
break;
}
- }
if (i < smtp_accept_max) continue; /* Found an accepting process */
}
if (queue_pid_slots)
{
- int max = atoi(expand_string(queue_run_max));
+ int max = atoi(CS expand_string(queue_run_max));
for (i = 0; i < max; i++)
if (queue_pid_slots[i] == pid)
{
int listen_socket_count = 0;
ip_address_item *addresses = NULL;
time_t last_connection_time = (time_t)0;
-int local_queue_run_max = atoi(expand_string(queue_run_max));
+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. */
if (inetd_wait_mode)
{
- int on = 1;
-
listen_socket_count = 1;
listen_sockets = store_get(sizeof(int));
(void) close(3);
}
/* 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;
if (daemon_listen && !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
necessary for (some release of) USAGI Linux; other IP stacks fail at the
listen() stage instead. */
+#ifdef TCP_FASTOPEN
+ tcp_fastopen_ok = TRUE;
+#endif
for(;;)
{
uschar *msg, *addr;
}
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);
+
+#ifdef TCP_FASTOPEN
+ if (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));
+ 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 (!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 "
}
else if (ipa->address[0] == 0)
(void)sprintf(CS p, " port %d (IPv4)", ipa->port);
+ else if ( i > 0
+ && host_is_tls_on_connect_port(ipa[-1].port) == (j > 0)
+ && Ustrcmp(ipa->address, ipa[-1].address) == 0
+ )
+ {
+ if (p[-1] == '}') p--;
+ while (isdigit(*--p)) ;
+ (void)sprintf(CS p+1, "%s%d,%d}", *p == ',' ? "" : "{",
+ ipa[-1].port, ipa->port);
+ }
else
(void)sprintf(CS p, " [%s]:%d", ipa->address, ipa->port);
while (*p != 0) 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): %s, listening for %s", version_string, 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(%s): -q%s, not listening",
- version_string,
- 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
errno = EINTR;
}
else
- {
lcount = select(max_socket + 1, (SELECT_ARG2_TYPE *)&select_listen,
NULL, NULL, NULL);
- }
if (lcount < 0)
{
while (lcount-- > 0)
{
int accept_socket = -1;
+
if (!select_failed)
- {
for (sk = 0; sk < listen_socket_count; sk++)
- {
if (FD_ISSET(listen_sockets[sk], &select_listen))
{
len = sizeof(accepted);
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
git://git.exim.org / exim.git / blobdiff