[Asterisk-code-review] chan sip: Add TCP/TLS keepalive to TCP/TLS server (asterisk[13])

[Jonathan Rose]

Jonathan Rose has uploaded a new change for review.

  https://gerrit.asterisk.org/1798

Change subject: chan_sip: Add TCP/TLS keepalive to TCP/TLS server
......................................................................

chan_sip: Add TCP/TLS keepalive to TCP/TLS server

Adds the TCP Keep Alive option to TCP and TLS server sockets. Previously
this option was only being set on session sockets.
http://www.tldp.org/HOWTO/html_single/TCP-Keepalive-HOWTO/
According to the link abov, the SO_KEEPALIVE option is useful for knowing
when a TCP connected endpoint has severed communication without indicating
it or has become unreachable for some reason. Without this patch, keep
alive is not set on the socket listening for incoming TCP sessions and
in Komatsu's report this resulted in the thread listening for TCP becoming
stuck in a waiting state.

ASTERISK-25364 #close
Reported by: Hiroaki Komatsu

Change-Id: I7ed7bcfa982b367dc64b4b73fbd962da49b9af36
---
M channels/chan_sip.c
1 file changed, 13 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/98/1798/1

diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 9bc15bb..5c808cc 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -32235,6 +32235,12 @@
 		ast_log(LOG_ERROR, "SIP TCP Server start failed. Not listening on TCP socket.\n");
 	} else {
 		ast_debug(2, "SIP TCP server started\n");
+		if (sip_tcp_desc.accept_fd >= 0) {
+			int flags = 1;
+			if (setsockopt(sip_tcp_desc.accept_fd, SOL_SOCKET, SO_KEEPALIVE, &flags, sizeof(flags))) {
+				ast_log(LOG_ERROR, "Error enabling TCP keep-alive on sip socket: %s\n", strerror(errno));
+			}
+		}
 	}
 
 	/* Start TLS server if needed */
@@ -32255,6 +32261,13 @@
 			ast_log(LOG_ERROR, "TLS Server start failed. Not listening on TLS socket.\n");
 			sip_tls_desc.tls_cfg = NULL;
 		}
+		if (sip_tls_desc.accept_fd >= 0) {
+			int flags = 1;
+			if (setsockopt(sip_tls_desc.accept_fd, SOL_SOCKET, SO_KEEPALIVE, &flags, sizeof(flags))) {
+				ast_log(LOG_ERROR, "Error enabling TCP keep-alive on sip socket: %s\n", strerror(errno));
+				sip_tls_desc.tls_cfg = NULL;
+			}
+		}
 	} else if (sip_tls_desc.tls_cfg->enabled) {
 		sip_tls_desc.tls_cfg = NULL;
 		ast_log(LOG_WARNING, "SIP TLS server did not load because of errors.\n");

-- 
To view, visit https://gerrit.asterisk.org/1798
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I7ed7bcfa982b367dc64b4b73fbd962da49b9af36
Gerrit-PatchSet: 1
Gerrit-Project: asterisk
Gerrit-Branch: 13
Gerrit-Owner: Jonathan Rose <jrose at digium.com>