Select() calls do not handle EINTR

[t3rmin4t0r]

None of the select() calls in scapy.py handles syscall interruptions.

The attached patch is workaround which lets me use scapy in my tools.

[t3rmin4t0r]

replace select() with a custom loop with EINTR handling

[pbi]

Which use case need this ? How did you get an EINTR error ? What operating system ? Usually, except when playing with sigaction(), the kernel restart interrupted system calls by itself.

[t3rmin4t0r]

I'm using scapy in a hacked up python-twisted DNS server on linux-x86-smp (ubuntu edgy).

What it was supposed to do was to convert DNS requests into RARPs on LAN - but most OSes don't respond to RARP - but an ARP ping scan can do nearly the same.

I'll put up the entire code tomorrow (<100 lines).

[t3rmin4t0r]

I've put up the code at

 http://t3.dotgnu.info/code/dnsmac.tar.gz

to use, edit the dnsconfig.py to add a host/mac mapping and set iface to eth0/eth1. And run

dig @127.0.0.2 <host>

Sometimes it locks up, sometimes it just throws an EINTR. With the patch, it works.