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authorDan McGee <dan@archlinux.org>2011-09-19 08:10:13 -0500
committerMax Kellermann <max@duempel.org>2011-09-19 17:11:09 +0200
commit27946a981ff4192f064feb3117567463c137933f (patch)
tree1e03c0564a65c43ba98a29d8ed7938464e32d3f3 /src/output/httpd_client.c
parent74617389c88ccf630b8cce4b54d9e2fa5afb2259 (diff)
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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>
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