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/usr/lib/cgi-bin/lg/lgform.cgi is in rancid-cgi 2.3.8-3.

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The actual contents of the file can be viewed below.

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#! /usr/bin/perl
##
## $Id: lgform.cgi.in 2334 2011-11-17 21:09:37Z heas $
##
## rancid 2.3.8
## Copyright (c) 1997-2011 by Terrapin Communications, Inc.
## All rights reserved.
##
## This code is derived from software contributed to and maintained by
## Terrapin Communications, Inc. by Henry Kilmer, John Heasley, Andrew Partan,
## Pete Whiting, Austin Schutz, and Andrew Fort.
##
## Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions
## are met:
## 1. Redistributions of source code must retain the above copyright
##    notice, this list of conditions and the following disclaimer.
## 2. Redistributions in binary form must reproduce the above copyright
##    notice, this list of conditions and the following disclaimer in the
##    documentation and/or other materials provided with the distribution.
## 3. All advertising materials mentioning features or use of this software
##    must display the following acknowledgement:
##        This product includes software developed by Terrapin Communications,
##        Inc. and its contributors for RANCID.
## 4. Neither the name of Terrapin Communications, Inc. nor the names of its
##    contributors may be used to endorse or promote products derived from
##    this software without specific prior written permission.
## 5. It is requested that non-binding fixes and modifications be contributed
##    back to Terrapin Communications, Inc.
##
## THIS SOFTWARE IS PROVIDED BY Terrapin Communications, INC. AND CONTRIBUTORS
## ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
## TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
## PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COMPANY OR CONTRIBUTORS
## BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
## CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
## SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
## INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
## CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
## ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
## POSSIBILITY OF SUCH DAMAGE.
# 
# The original original lookingglass s/w was written by Ed Kern.  It was
# a single script that used to be available at http://nitrous.digex.net/.
# Provided by permission and modified beyond recognition.
#
# lgform.cgi - Looking glass front-end
# produces html form for calling lg.cgi

BEGIN {
    $me = $0;
    $me =~ s/.*\/(\S+)$/$1/;
}

use CGI qw/:standard/;
use POSIX qw(strftime);
use Sys::Syslog;

my(@rtrlist, %rtrlabels);
my($BASEDIR) = "/";
my($SYSCONFDIR) = "/etc/rancid";
my($LOCALSTATEDIR) = "/var/lib/rancid";

# note: the following functions are duplicated between lgform.cgi and lg.cgi
# to avoid the need for module inclusion headaches from within a httpd context.
# it is just easier to be self-contained.
# SO, ANY CHANGES HERE SHOULD BE REFLECTED IN THE OTHER .cgi.

# logging
sub dolog
{
    my($level, $msg) = @_;

    if (defined($LG_LOG) && $LG_LOG !~ /\//) {
	openlog($me, "pid", $LG_LOG);
	syslog($level, "%s", $msg);
	closelog;
    } else {
	local(*LOG);
	my($file);
	if (defined($LG_LOG)) {
	    $file = $LG_LOG;
	} else {
	    $file = "$cache_dir/lg.log";
	}
	#  log date, hostname, query, addr
	if (open(LOG, ">>$file") == 0) {
	    # stderr, if all else fails
	    printf(STDERR "[" . strftime("%a %b %e %H:%M:%S %Y", gmtime) .
			"] could not open log file $file: $!\n");
	    printf(STDERR $msg);
	} else {
	    printf(LOG $msg);
	    close(LOG);
	}
    }
    return;
}

# read LG configuration file
sub readconf
{
    my($conffile, $cmds);
    local(*CONF);
    if (defined($ENV{LG_CONF})) {
	$conffile = $ENV{LG_CONF};
    } elsif (-e "lg.conf") {
	$conffile = "lg.conf";
    } else {
	$conffile = "$SYSCONFDIR/lg.conf";
    }

    if (! -f $conffile) {
	return;
    }

    if (open(CONF, "< $conffile")) {
	while (<CONF>) {
	    next if (/^\s*(#|$)/);
	    $cmds .= $_;
	}
	close(CONF);
	eval $cmds;
    } else {
	printf(STDERR "ERROR: couldn\'t open the configuration file: " .
							"$conffile: $!\n");
	exit(1);
    }

    return;
}

# read router.db file
sub readrouters
{
    my($rtrdb);
    local(*RTR);

    if (defined($LG_ROUTERDB)) {
	$rtrdb = $LG_ROUTERDB;
    } else {
	$rtrdb = "$SYSCONFDIR/router.db";
    }

    if (! -f $rtrdb) {
	my(@dirs, $dir);
	# if the router.db file does not exist, try to compile the list from
	# the rancid group router.db files.
	local(*DIR);
	if (! opendir(DIR, $LOCALSTATEDIR)) {
	    dolog(LOG_ERR, "ERROR: couldn\'t read $LOCALSTATEDIR: $!\n");
	} else {
	    while ($dir = readdir(DIR)) {
		next if ($dir =~ /^(\.|\.\.|\.ssh|CVS|bin|etc|logs|util)$/);
		push(@dirs, $dir) if (-d "$LOCALSTATEDIR/$dir");
	    }
	    closedir(DIR);

	    foreach $dir (@dirs) {
		if (! opendir(DIR, "$LOCALSTATEDIR/$dir")) {
		    dolog(LOG_ERR,
			"ERROR: couldn\'t read $LOCALSTATEDIR/$dir: $!\n");
		    next;
		}
		closedir(DIR);
		next if (! -f "$LOCALSTATEDIR/$dir/router.db");
		if (open(RTR, "< $LOCALSTATEDIR/$dir/router.db")) {
		    while (<RTR>) {
			next if (/^\s*(#|$)/);
			# fqdn:mfg:state
			@record = split('\:', $_);
			next if ($record[2] !~ /up/i || $record[1] !~ /(cisco|foundry|juniper)/);
			push(@rtrlist, join(':', ($record[0], $record[1])));
			$rtrlabels{join(':', ($record[0], $record[1]))} = $record[0];
		    }
		    close(RTR);
		} else {
		    dolog(LOG_ERR, "ERROR: couldn\'t open the router.db " .
				"file: $LOCALSTATEDIR/$dir/router.db: $!\n");
		}
	    }
	}
    } else {
	if (open(RTR, "< $rtrdb")) {
	    while (<RTR>) {
		next if (/^\s*(#|$)/);
		# fqdn:mfg:state
		@record = split('\:', $_);
		next if ($record[2] !~ /up/i || $record[1] !~ /(cisco|foundry|juniper)/);
		push(@rtrlist, join(':', ($record[0], $record[1])));
		$rtrlabels{join(':', ($record[0], $record[1]))} = $record[0];
	    }
	    close(RTR);
	} else {
	    dolog(LOG_ERR, "ERROR: couldn\'t open the router.db file: " .
								"$rtrdb: $!\n");
	    exit(1);
	}
    }

    return;
}

# Main()
# read the configuration file if it exists.
readconf();

$query = new CGI;

print $query->header;
if ($LG_STYLE) {
    print $query->start_html(-title =>"LookingGlass form",
						-style => {'src' => $LG_STYLE});
} else {
    print $query->start_html(-title =>"LookingGlass form");
}

# add the company image, LG_IMAGE
print $LG_IMAGE;

print <<HEAD ;
<br>
<B><FONT SIZE=+2>Looking Glass</FONT></B>
<br>
<hr>
HEAD

# start table, etc here
print $query->startform( -action => 'lg.cgi', -method => 'POST');
print <<DOTABLE ;
<center>
<table border cellspacing=0 width=575 align=center>

DOTABLE

# available query types here
print <<TABLEHEAD ;
<tr valign=top>
        <th align=left><B>Query:</B></th>
        <th align=left><B>Router:</B></th>
</tr>
<tr><td>
TABLEHEAD

foreach $sub_type (sort keys(%$queries)) {
    next if (! scalar(%{$queries->{$sub_type}}));
    print $query->radio_group (-name => 'query',
				-values => $queries->{$sub_type},
				-default => '-', -linebreak => 'true');
    print "\n" . $query->hr . "\n";
}

print <<QTYPES ;

<P><B>Argument(s):</B> <INPUT name="args" size=30></P>
        </TD>
        <td aligh=left valign=top>
QTYPES

# read routers table and create the scrolling list
readrouters();
print $query->scrolling_list(-name => 'router',
			-values => \@rtrlist,
			-size => 20,
			-labels => \%rtrlabels);

# end
print <<TABLEEND ;
</dd>
</td>
</TABLE>
<p>
TABLEEND

print $query->submit(-name => 'submit', -value =>'Submit');
print $query->reset;
print $query->endform;

print <<TAIL ;
</center>
<br>
<a href=lgnotes.html>Looking Glass notes</a>
<p>
$LG_INFO
TAIL

print $query->end_html;

exit(0);