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I found tc, which allows you to filter by ip, port etc. and then limit rates. But I was wondering if there was anything that could filter by application or limit rate given another process' socket ..

Thanks!

ok seems like

I can use lsof -iTCP and ipfw pipes ... wonder how efficient that is ..

lsof -iTCP: http://danielmiessler.com/study/lsof/

ipfw: http://www.macgeekery.com/hacks/software/traffic_shaping_in_mac_os_x

ipfw in C: http://psb.sbras.ru/cgi-bin/www/unix_help/unix-man?ipfw+4

with rate limiting (dummynet): http://www.opensource.apple.com/source/network_cmds/network_cmds-115.2/ipfw.tproj/ipfw.c

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migrated from stackoverflow.com Dec 16 '11 at 6:33

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1 Answer 1

up vote 2 down vote accepted

Netfilter (iptables) has the owner (and also a socket, if you wish to use that) module. With it you can apply standard firewall rules if user id or group id matches, and optionally match if the packet is associated with a socket.

iptables -t mangle -A PREROUTING -m owner -u some_user --socket-exists -j MARK --set-mark 100

Then just use tc in a way it catches mark 100:

tc filter add dev eth0 parent ffff: protocol ip prio 10 u32 match mark 100 ...

This was just my mindflow and I have no idea if this works, but give it a try. :)

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The owner module also supports the specification of a PID: -m owner --pid-owner <pid> –  the-wabbit Dec 16 '11 at 9:26
    
Oh, forgot that. Thanks :) –  Janne Pikkarainen Dec 16 '11 at 9:28
    
Welcome. Although I doubt it will help resolve the question - the original poster seems to be using BSD. –  the-wabbit Dec 16 '11 at 9:30
    
Let's see about that. This lottery could go both ways; tags mention Linux and I think tc is more Linux oriented command. –  Janne Pikkarainen Dec 16 '11 at 9:33
    
Thanks, yes I was using BSD then switched to Linux so I could use tc. –  Lavanya Jan 16 '12 at 3:09

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