if (smtp_load_reserve >= 0)
{
load_average = OS_GETLOADAVG();
- if (smtp_reserve_hosts == NULL && load_average > smtp_load_reserve)
+ if (!smtp_reserve_hosts && load_average > smtp_load_reserve)
{
DEBUG(D_any) debug_printf("rejecting SMTP connection: load average = %.2f\n",
(double)load_average/1000.0);
{
uschar *list = hosts_connection_nolog;
memset(sender_host_cache, 0, sizeof(sender_host_cache));
- if (list != NULL && verify_check_host(&list) == OK)
+ if (list && verify_check_host(&list) == OK)
save_log_selector &= ~L_smtp_connection;
else
log_write(L_smtp_connection, LOG_MAIN, "SMTP connection from %s "
int save_debug_selector = debug_selector;
BOOL local_queue_only;
BOOL session_local_queue_only;
- #ifdef SA_NOCLDWAIT
+#ifdef SA_NOCLDWAIT
struct sigaction act;
- #endif
+#endif
smtp_accept_count++; /* So that it includes this process */
+ /* If the listen backlog was over the monitoring level, log it. */
+
+ if (smtp_listen_backlog > smtp_backlog_monitor)
+ log_write(0, LOG_MAIN, "listen backlog %d I=[%s]:%d",
+ smtp_listen_backlog, interface_address, interface_port);
+
/* May have been modified for the subprocess */
*log_selector = save_log_selector;
(void)fcntl(dup_accept_socket, F_SETFD,
fcntl(dup_accept_socket, F_GETFD) | FD_CLOEXEC);
- #ifdef SA_NOCLDWAIT
+#ifdef SA_NOCLDWAIT
act.sa_handler = SIG_IGN;
sigemptyset(&(act.sa_mask));
act.sa_flags = SA_NOCLDWAIT;
sigaction(SIGCHLD, &act, NULL);
- #else
+#else
signal(SIGCHLD, SIG_IGN);
- #endif
+#endif
signal(SIGTERM, SIG_DFL);
signal(SIGINT, SIG_DFL);
(void)fclose(smtp_in);
(void)close(fileno(smtp_out));
(void)fclose(smtp_out);
+ smtp_in = smtp_out = NULL;
/* Don't ever molest the parent's SSL connection, but do clean up
the data structures if necessary. */
}
+
+
+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 *
*************************************************/
void
daemon_go(void)
{
-struct passwd *pw;
-int *listen_sockets = NULL;
-int listen_socket_count = 0;
-ip_address_item *addresses = NULL;
+struct passwd * pw;
+int * listen_sockets = NULL;
+int listen_socket_count = 0, listen_fd_max = 0;
+fd_set select_listen;
+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);
if (f.inetd_wait_mode)
{
listen_socket_count = 1;
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;
}
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
+#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
+#endif
}
for (ipa = addresses, sk = 0; sk < listen_socket_count; ipa = ipa->next, sk++)
{
BOOL wildcard;
- ip_address_item *ipa2;
- int af;
+ ip_address_item * ipa2;
+ int fd, af;
if (Ustrchr(ipa->address, ':') != NULL)
{
wildcard = ipa->address[0] == 0;
}
- if ((listen_sockets[sk] = ip_socket(SOCK_STREAM, af)) < 0)
+ if ((listen_sockets[sk] = fd = ip_socket(SOCK_STREAM, af)) < 0)
{
if (check_special_case(0, addresses, ipa, FALSE))
{
#ifdef IPV6_V6ONLY
if (af == AF_INET6 && wildcard &&
- setsockopt(listen_sockets[sk], IPPROTO_IPV6, IPV6_V6ONLY, CS (&on),
+ setsockopt(fd, 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));
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,
+ if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
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));
/* 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(listen_sockets[sk], IPPROTO_TCP, TCP_NODELAY,
+ if (tcp_nodelay) setsockopt(fd, IPPROTO_TCP, TCP_NODELAY,
US (&on), sizeof(on));
/* Now bind the socket to the required port; if Exim is being restarted
for(;;)
{
uschar *msg, *addr;
- if (ip_bind(listen_sockets[sk], af, ipa->address, ipa->port) >= 0) break;
+ if (ip_bind(fd, af, ipa->address, ipa->port) >= 0) break;
if (check_special_case(errno, addresses, ipa, TRUE))
{
DEBUG(D_any) debug_printf("wildcard IPv4 bind() failed after IPv6 "
"listen() success; EADDRINUSE ignored\n");
- (void)close(listen_sockets[sk]);
+ (void)close(fd);
goto SKIP_SOCKET;
}
msg = US strerror(errno);
else
debug_printf("listening on %s port %d\n", ipa->address, ipa->port);
+ /* Start listening on the bound socket, establishing the maximum backlog of
+ connections that is allowed. On success, add to the set of sockets for select
+ and continue to the next address. */
+
#if defined(TCP_FASTOPEN) && !defined(__APPLE__)
if ( f.tcp_fastopen_ok
- && setsockopt(listen_sockets[sk], IPPROTO_TCP, TCP_FASTOPEN,
+ && setsockopt(fd, 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)
+ if (listen(fd, 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)))
+ && setsockopt(fd, IPPROTO_TCP, TCP_FASTOPEN, &on, sizeof(on)))
{
DEBUG(D_any) debug_printf("setsockopt FASTOPEN: %s\n", strerror(errno));
f.tcp_fastopen_ok = FALSE;
}
#endif
+
+ add_listener_socket(fd, &select_listen, &listen_fd_max);
continue;
}
DEBUG(D_any) debug_printf("wildcard IPv4 listen() failed after IPv6 "
"listen() success; EADDRINUSE ignored\n");
- (void)close(listen_sockets[sk]);
+ (void)close(fd);
/* 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
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;
signal(SIGHUP, sighup_handler);
for (;;)
{
- #if HAVE_IPV6
- struct sockaddr_in6 accepted;
- #else
- struct sockaddr_in accepted;
- #endif
-
- EXIM_SOCKLEN_T len;
pid_t pid;
if (sigterm_seen)
if (f.daemon_listen)
{
- int lcount;
- int max_socket = 0;
+ int check_lsk = 0, lcount;
BOOL select_failed = FALSE;
- fd_set select_listen;
-
- FD_ZERO(&select_listen);
-#ifndef DISABLE_TLS
- if (tls_watch_fd >= 0)
- {
- FD_SET(tls_watch_fd, &select_listen);
- if (tls_watch_fd > max_socket) max_socket = tls_watch_fd;
- }
-#endif
- if (daemon_notifier_fd >= 0)
- {
- FD_SET(daemon_notifier_fd, &select_listen);
- if (daemon_notifier_fd > max_socket) max_socket = daemon_notifier_fd;
- }
- 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];
- }
+ fd_set fds = select_listen;
DEBUG(D_any) debug_printf("Listening...\n");
errno = EINTR;
}
else
- lcount = select(max_socket + 1, (SELECT_ARG2_TYPE *)&select_listen,
+ lcount = select(listen_fd_max, (SELECT_ARG2_TYPE *)&fds,
NULL, NULL, NULL);
if (lcount < 0)
while (lcount-- > 0)
{
int accept_socket = -1;
+#if HAVE_IPV6
+ struct sockaddr_in6 accepted;
+#else
+ struct sockaddr_in accepted;
+#endif
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, &select_listen))
+ if (tls_watch_fd >= 0 && FD_ISSET(tls_watch_fd, &fds))
{
- FD_CLR(tls_watch_fd, &select_listen);
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, &select_listen))
+ if (daemon_notifier_fd >= 0 && FD_ISSET(daemon_notifier_fd, &fds))
{
- 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))
+ while (check_lsk < listen_socket_count)
+ {
+ int lfd = listen_sockets[check_lsk++];
+ if (FD_ISSET(lfd, &fds))
{
- len = sizeof(accepted);
- accept_socket = accept(listen_sockets[sk],
- (struct sockaddr *)&accepted, &len);
- FD_CLR(listen_sockets[sk], &select_listen);
+ EXIM_SOCKLEN_T alen = sizeof(accepted);
+#if defined(TCP_INFO)
+ struct tcp_info ti;
+ socklen_t tlen = sizeof(ti);
+
+ /* If monitoring the backlog is wanted, grab for later logging */
+
+ smtp_listen_backlog = 0;
+ if ( smtp_backlog_monitor > 0
+ && getsockopt(lfd, 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);
+ smtp_listen_backlog = ti.tcpi_unacked;
+# elif defined(__FreeBSD__) /* This does not work. Investigate kernel sourcecode. */
+ lfd, ti.__tcpi_sacked, ti.__tcpi_unacked);
+ smtp_listen_backlog = ti.__tcpi_unacked;
+# endif
+ }
+#endif
+ accept_socket = accept(lfd, (struct sockaddr *)&accepted, &alen);
break;
}
+ }
}
/* If select or accept has failed and this was not caused by an
else if ( errno != accept_retry_errno
|| select_failed != accept_retry_select_failed
|| accept_retry_count >= 50)
- {
- log_write(0, LOG_MAIN | (accept_retry_count >= 50 ? LOG_PANIC : 0),
- "%d %s() failure%s: %s",
- accept_retry_count,
- accept_retry_select_failed ? "select" : "accept",
- accept_retry_count == 1 ? "" : "s",
- strerror(accept_retry_errno));
- log_close_all();
- accept_retry_count = 0;
- accept_retry_errno = errno;
- accept_retry_select_failed = select_failed;
- }
+ {
+ log_write(0, LOG_MAIN | (accept_retry_count >= 50 ? LOG_PANIC : 0),
+ "%d %s() failure%s: %s",
+ accept_retry_count,
+ accept_retry_select_failed ? "select" : "accept",
+ accept_retry_count == 1 ? "" : "s",
+ strerror(accept_retry_errno));
+ log_close_all();
+ accept_retry_count = 0;
+ accept_retry_errno = errno;
+ accept_retry_select_failed = select_failed;
+ }
accept_retry_count++;
}
else if (accept_retry_count > 0)
git://git.exim.org / exim.git / blobdiff