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| author | Dan McGee <dan@archlinux.org> | 2011-09-19 08:10:13 -0500 |
|---|---|---|
| committer | Max Kellermann <max@duempel.org> | 2011-09-19 17:11:09 +0200 |
| commit | 27946a981ff4192f064feb3117567463c137933f (patch) | |
| tree | 1e03c0564a65c43ba98a29d8ed7938464e32d3f3 /src/socket_util.h | |
| parent | 74617389c88ccf630b8cce4b54d9e2fa5afb2259 (diff) | |
| download | mpd-27946a981ff4192f064feb3117567463c137933f.tar.gz mpd-27946a981ff4192f064feb3117567463c137933f.tar.xz mpd-27946a981ff4192f064feb3117567463c137933f.zip | |
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 <dan@archlinux.org>
Diffstat (limited to '')
| -rw-r--r-- | src/socket_util.h | 3 |
1 files changed, 3 insertions, 0 deletions
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 |