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Re: no timeout in Net::Pcap::Easy

by VinsWorldcom (Parson)
on Mar 27, 2014 at 17:24 UTC ( #1079966=note: print w/replies, xml ) Need Help??

in reply to no timeout in Net::Pcap::Easy

Check the man page for 'pcap'. It specifies that the 'timeout' should not be relied upon as it is not supported on all platforms.

To get around this and capture with a timeout, I've done the following with some success:

use Net::Pcap; my $device = ... my $snaplen = ... my $timeout = ... * 1000 # in milliseconds * 1000 = seconds my $err; my $pcaprecv = Net::Pcap::pcap_open_live($device, $snaplen, 1, $timeou +t, \$err); my $recv_r; my %header; my $starttime = time; while (1) { my $ret = Net::Pcap::pcap_next_ex($pcaprecv, \%header, \$recv_r); if ($ret == 1) { # Found packet - do stuff } elsif ($ret == 0) { print "[Receive Timeout] "; last } else { print "[Receive Error] "; last } if ((time - $starttime) >= $timeout) { print "[Receive Timeout] "; last } }

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