From 27946a981ff4192f064feb3117567463c137933f Mon Sep 17 00:00:00 2001 From: Dan McGee Date: Mon, 19 Sep 2011 08:10:13 -0500 Subject: Set socket TCP keepalive option on incoming connections If a connected host disappears without our knowledge, as can happen over wireless or a hibernating machine, we continue to hold the port open waiting for messages. Because we never try to send anything down this now-broken pipe, the connection will sit idle taking up a slot in our allowed incoming connections list. If enough of these happen, an unintended Denial of Service takes place, where all connection slots are filled with now-broken, never ending connections. Setting the TCP keepalive option at least allows these to time out after the default two hours, which is sufficient in the non-malicious case. Signed-off-by: Dan McGee --- src/socket_util.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'src/socket_util.h') diff --git a/src/socket_util.h b/src/socket_util.h index 3ebf4084c..f27751aa3 100644 --- a/src/socket_util.h +++ b/src/socket_util.h @@ -63,4 +63,7 @@ socket_bind_listen(int domain, int type, int protocol, int backlog, GError **error); +int +socket_keepalive(int fd); + #endif -- cgit v1.2.3