Sonia Hamilton wrote:
> When a tcp (or udp) connection is setup, the client is allocated a
> source port - a so-called ephemeral port (this can be seen in the Local
> Address column of netstat).
>
> Out of interest, I wouldn't mind looking at the code that
> pseudo-randomly allocates this port number. Can anyone point me in the
> direction of the directory (or even file) I should look at? I'm not
> very familiar with the layout of the kernel code.
LXR (Linux Cross Reference) is a really good resource:
http://lxr.linux.no/linux
Searching for ephemeral results in (among others):
http://lxr.linux.no/linux/drivers/char/random.c#L1567
which I think may be what you are looking for.
The hard way to do this of course would be just grab an unzip a source
code tarball, cd into it and then:
grep -r ephemeral .
and see where that leads you.
Have fun :-).
Erik
--
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Erik de Castro Lopo
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"The question of whether a computer can think is no more interesting
than the question of whether a submarine can swim." -- edsger dijkstra
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