--- daemon/hawk.orig	2002-01-12 01:10:52.000000000 +0000
+++ daemon/hawk	2012-02-05 12:31:38.000000000 +0000
@@ -1,8 +1,9 @@
-#!/usr/bin/perl
+#!%%PREFIX%%/bin/perl -w
 
 # hawk version 0.60
 # Greg Heim <gregheim@mindspring.com>
 
+use strict;
 
 use Socket;
 use Net::Netmask;
@@ -10,12 +11,14 @@
 use File::Basename;
 use DBI;
 
+# Variables defined in the config file
+our (@networks, @gateways, $frequency, $pingtimeout, $debuglevel, $logfile,
+	$dbuser, $dbpass, $dbhost, $dbname, $pidfile);
 
 ############################################################################
 # create pid file and process config file
 ############################################################################
-$configfile = dirname($0) . "/hawk.conf";
-readConfigs($configfile);
+readConfigs("%%PREFIX%%/etc/hawk/daemon.conf");
 
 createPidFile($pidfile);
 
@@ -34,13 +37,24 @@
 # main loop
 ##########################################################################
 LOOP: while () {
+   my ($block, @children, $netblock, $gateway, @ips, $ip, $pingtime, $hostname);
 
-   $loopstarttime = time();
+   my $loopstarttime = time();
 
 
    BLOCK: foreach $block (@networks) {
+
+   my $pid = fork();
+   if ($pid) {
+      # parent
+      push (@children, $pid);
+   } elsif ($pid == 0) {
+      # child
+
       $netblock = new Net::Netmask ($block);
 
+      logMsg (2, "Forked a child process for $netblock");
+
       # check here that gateway is up
       if (@gateways) {
          foreach $gateway (@gateways) {
@@ -51,7 +65,7 @@
 
                if (!ping($gateway, $pingtimeout)) {
                   logMsg (1, "No response from gateway $gateway, skipping network $block");
-                  next BLOCK;
+                  exit (0);
                }
                else {
                   logMsg (1, "Gateway $gateway responded.  $block ok so far.");
@@ -90,15 +104,37 @@
          $hostname = gethostbyaddr (inet_aton($ip), AF_INET);
          $hostname = "" unless $hostname;
 
+	 my $for_rev_match='0';
+	 if ($hostname) {
+	    my $packed_host_ip = gethostbyname("$hostname");
+	    if (defined $packed_host_ip) {
+	       if (inet_ntoa($packed_host_ip) =~ /^$ip$/) {
+	          $for_rev_match='1';
+	       }
+	    }
+	 }
+
          # check if it's already in the database
          # if pingtime is zero, that field isn't updated
          if (ipExists($ip)) {
-            updateRecord($ip, $hostname, $pingtime);
+            updateRecord($ip, $hostname, $pingtime, $for_rev_match);
          }
          else {
-            insertRecord($ip, $hostname, $pingtime);
+            insertRecord($ip, $hostname, $pingtime, $for_rev_match);
          }
       }
+
+      logMsg (2, "Child process for $netblock exiting");
+      exit (0);
+
+   } else {
+      die "Couldn't fork: $!\n";
+   }
+
+   }
+
+   foreach (@children) {
+      waitpid($_, 0);
    }
 
    # sleep until it's time for another run
@@ -121,8 +157,9 @@
 ##########################################################################
 sub ipExists {
 
-   ($ip) = @_;
+   my ($ip) = @_;
    my $qip; # ip from query
+   my ($dbh, %attr, $sth);
 
    logMsg (2, "Checking database for $ip");
 
@@ -148,12 +185,13 @@
 ##########################################################################
 sub insertRecord{
 
-   ($ip, $hostname, $pingtime) = @_;
+   my ($ip, $hostname, $pingtime, $for_rev_match) = @_;
+   my ($dbh, %attr, $sth);
 
-   logMsg (2, "Inserting record: IP: $ip, Hostname: $hostname, Pingtime: $pingtime");
+   logMsg (2, "Inserting record: IP: $ip, Hostname: $hostname, Pingtime: $pingtime, Match: $for_rev_match");
 
    $dbh = DBI->connect('dbi:mysql:' . $dbname . ';host='. $dbhost, $dbuser, $dbpass, \%attr) or die "Couldn't connect to database: " . DBI->errstr;
-   $sth = $dbh -> prepare("insert into hawk.ip (ip, hostname, lastping) values ('$ip', '$hostname', '$pingtime')");
+   $sth = $dbh -> prepare("insert into hawk.ip (ip, hostname, lastping, for_rev_match) values ('$ip', '$hostname', '$pingtime', '$for_rev_match')");
    $sth -> execute or logMsg (0, "Couldn't update record!" . DBI -> errstr);
 
 }
@@ -164,15 +202,16 @@
 ##########################################################################
 sub updateRecord{
 
-   ($ip, $hostname, $pingtime) = @_;
+   my ($ip, $hostname, $pingtime, $for_rev_match) = @_;
+   my ($query, $dbh, %attr, $sth);
 
-   logMsg (2, "Updating record: IP: $ip, Hostname: $hostname, Pingtime: $pingtime");
+   logMsg (2, "Updating record: IP: $ip, Hostname: $hostname, Pingtime: $pingtime, Match: $for_rev_match");
 
    if ($pingtime) {
-      $query = "update hawk.ip set hostname = '$hostname', lastping = '$pingtime' where ip = '$ip'";
+      $query = "update hawk.ip set hostname = '$hostname', lastping = '$pingtime', for_rev_match = '$for_rev_match' where ip = '$ip'";
    }
    else {
-      $query = "update hawk.ip set hostname = '$hostname' where ip = '$ip'";
+      $query = "update hawk.ip set hostname = '$hostname', for_rev_match = '$for_rev_match' where ip = '$ip'";
    }
 
    $dbh = DBI->connect('dbi:mysql:' . $dbname . ';host='. $dbhost, $dbuser, $dbpass, \%attr) or die "Couldn't connect to database: " . DBI->errstr;
@@ -188,14 +227,15 @@
 sub ping {
 
    my ($ip, $timeout) = @_;
+   my ($p, $return);
 
    logMsg(2, "Pinging $ip");
 
-   $p = Net::Ping->new(icmp);
+   $p = Net::Ping->new('icmp');
    $return = $p->ping($ip, $timeout);
    $p->close;
 
-   logMsg(2, "Ping returned $return");
+   logMsg(2, "Ping $ip returned $return");
 
    return $return;
 }
@@ -208,7 +248,7 @@
 
 sub createPidFile {
 
-   ($pidfile) = @_;
+   my ($pidfile) = @_;
 
    logMsg (2, "Creating pid file $pidfile");
 
@@ -219,7 +259,7 @@
 
       # found pid file.  signalling existing process
       logMsg (1, "Pid file $pidfile exists.  Attempting to signal existing process.");
-      $kstatus = kill 0, $pid;
+      my $kstatus = kill 0, $pid;
 
       # see if we killed anything
       if ($kstatus) {
@@ -305,9 +345,8 @@
 
 sub readConfigs {
 
-   ($file) = @_;
+   my ($file) = @_;
 
-   logMsg(1, "Reading config file");
    do $file;
 
 }
@@ -317,12 +356,12 @@
 ##########################################################################
 # write debug messages
 ##########################################################################
-sub logMsg () {
+sub logMsg {
 
-   ($level, $message) = @_;
+   my ($level, $message) = @_;
    if ($debuglevel >= $level) {
 
-      $time = localtime(time);
+      my $time = localtime(time);
       open LOGFILE, ">> $logfile" || die "Couldn't open logfile: $!\n";
       print LOGFILE "$time: $message\n";
       close LOGFILE;