I'm coding a little app to find idle hosts using nmap, but I recieve SIGSEGV errors. I'm not sure if this is my fault or nmaps fault. 
#!/usr/bin/perl -w
use strict;
my $ip;
my $goodhosts = 0;
my $marker = 0;
while ($goodhosts != 10 ) {
  #used to pick a random ip address
  open(GETHOST, "nmap -iR 1 -sL |") || die "fix your code\n";
  while (<GETHOST>) {
    chomp;
      if ($_ =~ /(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})/) {
        $ip = $1;
      }
  }
close(GETHOST);
#test for idleness
open(IDLERESULT, "nmap -P0 -sI $ip whatever.ip |") || die "bad code\n"
+;
while (<IDLERESULT>) {
  chomp;
  if (m/completed/) {
    $marker = 1;
  }
}
close(IDLERESULT);
if ($marker == 1) {
  $goodhosts = $goodhosts + 1;
  system("echo $ip >> idle_hosts");
  $marker = 0;
  }
}

[download]
root@me root# ./idlesearch
Idlescan zombie 52.7.124.210 (52.7.124.210) port 80 cannot be used because it has not returned any of our probes -- perhaps it is down or firewalled. QUITTING! caught SIGSEGV signal, cleaning up
Idlescan zombie 164.248.128.208 (164.248.128.208) port 80 cannot be used because it has not returned any of our probes -- perhaps it is down or firewalled. QUITTING! caught SIGSEGV signal, cleaning up

Here is my box
uname -a
Linux 2.6.3-27mdk #1 Tue May 31 21:48:42 MDT 2005 i686 unknown unknown GNU/Linux

And here is perl
perl -v
This is perl, v5.8.3 built for i386-linux-thread-multi

And here is nmap
nmap -version
nmap version 3.93 ( http://www.insecure.org/nmap/ )

Thanks for any help.
Mike

In reply to SIGSEGV errors by aphex

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