Ping IAX2 server

ping-iax2.pl

#!/usr/bin/perl -w
# udp ping tool
# http://www.voip-info.org/wiki/index.php?page_id=2654&comments_page=1

use IO::Socket;
$target = shift; #"192.168.0.255";
$target_port = shift; # 4569

socket(PING, PF_INET, SOCK_DGRAM, getprotobyname("udp"));

# Build Packet ...
# Names from ethereal filter of registration packet

$src_call = "8000"; #8000 most siginificant bit is IAX packet type full ... required for a poke etc...
$dst_call = "0000";
$timestamp = "00000000";
$outbound_seq = "00";
$inbound_seq = "00";
$type = "06"; #IAX_Control
$iax_type = "1e"; #POKE
$msg = pack "H24", $src_call . $dst_call . $timestamp . $outbound_seq . $inbound_seq . $type . $iax_type;

# Send UDP packet

$ipaddr = inet_aton($target);
$sendto = sockaddr_in($target_port,$ipaddr);

send(PING, $msg, 0, $sendto) == length($msg) or die "cannot send to $target : $target_port : $!\n";

# Listen for responses... listen for TIMEOUT seconds and report all responders (works for broadcast pings)

$MAXLEN = 1024;
$TIMEOUT = 5;

eval {
  local $SIG{ALRM} = sub { die "alarm time out\n"; };
  alarm $TIMEOUT;

  recv(PING, $msg, $MAXLEN, 0) or die "recv: $!";

  alarm 0;
};

$type = "06"; #IAX_Control
$iax_type = "04"; #ACK
$msg = pack "H24", $src_call . $dst_call . $timestamp . $outbound_seq . $inbound_seq . $type . $iax_type;
send(PING, $msg, 0, $sendto) == length($msg) or die "cannot send to $target : $target_port : $!\n";

if ($@) {
  exit -1;
}