Beefy Boxes and Bandwidth Generously Provided by pair Networks
laziness, impatience, and hubris
 
PerlMonks  

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

by VinsWorldcom (Priest)
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 } }


Comment on Re: no timeout in Net::Pcap::Easy
Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1079966]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others wandering the Monastery: (13)
As of 2014-07-29 18:36 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    My favorite superfluous repetitious redundant duplicative phrase is:









    Results (226 votes), past polls