Initial commit

README.md

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+#Misc Linux Tools
+
+Miscellaneous tools used at the Linux command line.
+
+##pinger
+
+Tool to imcp ping an IP or range of IPs and return which ones are reacable.
+
+```
+$ sudo pinger -h
+```

pinger

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+#!/usr/bin/env perl
+use strict;
+use Net::Ping;
+use POSIX;
+use Time::HiRes qw/time/;
+
+if($> != 0) {
+  die("pinger must be run as root\n");
+}
+
+my $alive = 1;
+my $time = 0;
+my($start,$finish);
+while($ARGV[0] =~ /\-/) {
+  my $arg = shift(@ARGV);
+  $arg =~ s/-//;
+
+  my @switches = split('', $arg);
+
+  foreach my $switch (@switches) {
+    if($switch eq "d") {
+      $alive = 0;
+    } elsif($switch eq "r") {
+      $alive = 1;
+    } elsif($switch eq "t") {
+      $time = 1;
+    } elsif($switch eq "h") {
+      help();
+    } else {
+      print "pinger: invalid option -- '$switch'\n";
+      help();
+    }
+  }
+}
+
+if(scalar(@ARGV) < 1 || scalar(@ARGV) > 2) {
+  die("Usage: pinger START_IP [END_IP]\n");
+}
+
+$start = time if($time);
+my $p = Net::Ping->new('icmp');
+my @ips;
+if(scalar(@ARGV) == 2) {
+  # must be IP addresses
+  if($ARGV[0] !~ /((?:\d{1,3}\.){3}\d{1,3})/ || $ARGV[1] !~ /((?:\d{1,3}\.){3}\d{1,3})/) {
+    die("Both arguments must be IP addresses if two are specified.\n");
+  }
+
+  # and only the final octet should differ
+  my @ip1 = split(/\./, $ARGV[0]);
+  my @ip2 = split(/\./, $ARGV[1]);
+  if($ip1[0] != $ip2[0] || $ip1[1] != $ip2[1] || $ip1[2] != $ip2[2]) {
+    die("The first three octets of the IP addresses must match.\n")
+  }
+
+  my $baseIp = $ip1[0] . '.' . $ip1[1] . '.' . $ip1[2];
+  my $start = $ip1[3];
+  my $end = $ip2[3];
+  my $count = $ip2[3] - $ip1[3] + 1;
+
+  for(my $i = $start, my $k = 1; $i <= $end; $i++, $k++) {
+    $| = 1;
+   
+    progressBar($k, $count);
+
+    my $ip = $baseIp . '.' . $i;
+
+    push(@ips, $ip) if($p->ping($ip, 1) == $alive);
+  }
+} elsif(scalar(@ARGV) == 1) {
+  my $host = $ARGV[0];
+  
+  push(@ips, $host) if($p->ping($host, 1) == $alive);
+}
+$p->close();
+$finish = time if($time);
+
+print "\n";
+($alive) ? print "Reachable:\n" : print "Dead:\n";
+print join(", ", @ips);
+print "\n\n";
+
+if($time) {
+  my $completed = $finish - $start;
+  printf("Completed in %.2f seconds.\n", $completed);
+}
+
+# details from http://stackoverflow.com/questions/1782107/how-do-i-retrieve-the-terminal-width-in-perl
+sub findTerminalWidth {
+  my($winsize, $row, $col, $xpixel, $ypixel);
+  my $available = 1;
+  require 'sys/ioctl.ph';
+  $available = 0 unless defined &TIOCGWINSZ;
+  open(TTY, "+</dev/tty") or $available = 0;
+  unless (ioctl(TTY, &TIOCGWINSZ, $winsize = '')) {
+      $available = 0;
+  }
+  if($available == 1) {
+    ($row, $col, $xpixel, $ypixel) = unpack('S4', $winsize);
+  } else {
+    return -1;
+  }
+  
+  return $col;
+}
+
+sub progressBar {
+  my($current, $total) = @_;
+  my $width = findTerminalWidth();
+
+  my $barWidth = $width - 11;
+  my $percent = ($current / $total) * 100;
+  my $barPercent = int($percent / 100 * $barWidth);
+  printf(" [%3d\%",$percent);
+  if($width > 0) {
+    print "] [";
+    for(my $i = 1; $i < $barWidth; $i++) {
+      ($i <= $barPercent) ? print '=' : print ' ';
+    }
+  }
+  print "]\r";
+}
+
+sub help {
+  print "usage:\t pinger [-d] start [finish]\n\n";
+  print "\t-d\t\tList dead addresses\n";
+  print "\t-r\t\tList reachable addresses (default)\n";
+  print "\t-t\t\tTime ping execution\n";
+  exit(1);
+}