#!/usr/bin/perl
##
## $Id: csbrancid,v 1.4 2009-06-06 14:04:25 bjorn Exp $
##
## rancid 2.3.2a8
## Copyright (c) 1997-2007 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.
#
# This version of rancid tries to deal with zebra s/w.
#
#  RANCID - Really Awesome New Cisco confIg Differ
#
# usage: rancid [-dV] [-l] [-f filename | hostname]
#
use Getopt::Std;
getopts('dflV');
if ($opt_V) {
    print "rancid 2.3.2a8\n";
    exit(0);
}
$log = $opt_l;
$debug = $opt_d;
$file = $opt_f;
$host = $ARGV[0];
$clean_run = 0;
$found_end = 0;
$timeo = 90;				# clogin timeout in seconds

my(@commandtable, %commands, @commands);# command lists
my($aclsort) = ("ipsort");		# ACL sorting mode
my($filter_commstr);			# SNMP community string filtering
my($filter_pwds);			# password filtering mode

# This routine is used to print out the router configuration
sub ProcessHistory {
    my($new_hist_tag,$new_command,$command_string,@string) = (@_);
    if ((($new_hist_tag ne $hist_tag) || ($new_command ne $command))
	&& %history) {
	print eval "$command \%history";
	undef %history;
    }
    if (($new_hist_tag) && ($new_command) && ($command_string)) {
	if ($history{$command_string}) {
	    $history{$command_string} = "$history{$command_string}@string";
	} else {
	    $history{$command_string} = "@string";
	}
    } elsif (($new_hist_tag) && ($new_command)) {
	$history{++$#history} = "@string";
    } else {
	print "@string";
    }
    $hist_tag = $new_hist_tag;
    $command = $new_command;
    1;
}

sub numerically { $a <=> $b; }

# This is a sort routine that will sort numerically on the
# keys of a hash as if it were a normal array.
sub keynsort {
    local(%lines) = @_;
    local($i) = 0;
    local(@sorted_lines);
    foreach $key (sort numerically keys(%lines)) {
	$sorted_lines[$i] = $lines{$key};
	$i++;
    }
    @sorted_lines;
}

# This is a sort routine that will sort on the
# keys of a hash as if it were a normal array.
sub keysort {
    local(%lines) = @_;
    local($i) = 0;
    local(@sorted_lines);
    foreach $key (sort keys(%lines)) {
	$sorted_lines[$i] = $lines{$key};
	$i++;
    }
    @sorted_lines;
}

# This is a sort routine that will sort on the
# values of a hash as if it were a normal array.
sub valsort{
    local(%lines) = @_;
    local($i) = 0;
    local(@sorted_lines);
    foreach $key (sort values %lines) {
	$sorted_lines[$i] = $key;
	$i++;
    }
    @sorted_lines;
}

# This is a numerical sort routine (ascending).
sub numsort {
    local(%lines) = @_;
    local($i) = 0;
    local(@sorted_lines);
    foreach $num (sort {$a <=> $b} keys %lines) {
	$sorted_lines[$i] = $lines{$num};
	$i++;
    }
    @sorted_lines;
}

# This is a sort routine that will sort on the
# ip address when the ip address is anywhere in
# the strings.
sub ipsort {
    local(%lines) = @_;
    local($i) = 0;
    local(@sorted_lines);
    foreach $addr (sort sortbyipaddr keys %lines) {
	$sorted_lines[$i] = $lines{$addr};
	$i++;
    }
    @sorted_lines;
}

# These two routines will sort based upon IP addresses
sub ipaddrval {
    my(@a) = ($_[0] =~ m#^(\d+)\.(\d+)\.(\d+)\.(\d+)$#);
    $a[3] + 256 * ($a[2] + 256 * ($a[1] +256 * $a[0]));
}
sub sortbyipaddr {
    &ipaddrval($a) <=> &ipaddrval($b);
}

# This routine parses "show system"
sub ShowSystem {
    print STDERR "    In ShowSystem: $_" if ($debug);

    $_ = <INPUT>;

    if (/command authorization failed/i) {
	return(-1);
    } elsif (/^$prompt/) {
	return(0);
    } elsif (/^\s*$/) {
	ShowSystemSections($_);
    } else {
	ShowSystemLines($_);
    }

    return(0);
}

sub ShowSystemSections {
    $_ = $_[0];
    my $skip_section = 0;
    while () {
	# delete rare characters
	tr/\015//d;

	# finish cases
	last if(/^$prompt/);

	# new section comes, reset skip
	if(/^(\s*|\s*$cmd\s*)$/) {
	    $skip_section = 0;
	    $_ = <INPUT>;
	    next;
	}

	# begin of a section to avoid
	$skip_section=1 if(/Unit\s+Up\s+(T|t)ime/);
	$skip_section=1 if(/Unit\s+(Fans|FAN)/);
	$skip_section=1 if(/Unit\s+Temperature/);

	# we are on a section to avoid?
	if($skip_section) {
	    $_ = <INPUT>;
	    next;
	}
	ProcessHistory("COMMENTS","keysort","B0", "!$_");
	$_ = <INPUT>;
    }
}

sub ShowSystemLines {
    $_ = $_[0];
    my $skip = 0;
    while () {
	# delete rare characters
	tr/\015//d;

	# finish cases
	last if(/^$prompt/);
	last if(/Unit\s*Temperature/);

	# remove lines but continue
	$skip=1 if(/^(\s*|\s*$cmd\s*)$/);
	$skip=1 if(/Up Time/);

	# if not skiped, save the log
	if($skip){
	    # reset skip for next line
	    $skip = 0;
	} else {
	    ProcessHistory("COMMENTS","keysort","B0", "!$_");
	}
	$_ = <INPUT>;
    }
}

# This routine parses "show version"
sub ShowVersion {
    print STDERR "    In ShowVersion: $_" if ($debug);

    while (<INPUT>) {
	tr/\015//d;
	last if(/^$prompt/);
	next if(/^(\s*|\s*$cmd\s*)$/);
	return(-1) if (/command authorization failed/i);

	ProcessHistory("COMMENTS","keysort","C0", "!$_") && next;

    }
    return(0);
}

# This routine processes a "show startup-config"
sub ShowStartupConfig {
    print STDERR "    In ShowStartupConfig: $_" if ($debug);

    while (<INPUT>) {
	tr/\015//d;
	last if(/^$prompt/);
	return(-1) if (/command authorization failed/i);

	if (/^(enable password( \d)?) / && $filter_pwds >= 1) {
	    ProcessHistory("ENABLE","","","!$1 <removed>\n");
	    next;
	}
	if (/^username (\S+)(\s.*)? password encrypted ((\d) \S+|\S+)(.*)/) {
	    if ($filter_pwds == 2) {
		ProcessHistory("USER","keysort","$1","!username $1$2 password encrypted <removed>$5\n");
	    } elsif ($filter_pwds == 1 && $4 ne "5"){
		ProcessHistory("USER","keysort","$1","!username $1$2 password encrypted <removed>$5\n");
	    } else {
		ProcessHistory("USER","keysort","$1","$_");
	    }
	    next;
	}

	# filter out any RCS/CVS tags to avoid confusing local CVS storage
	s/\$(Revision|Id):/ $1:/;

	# order access-lists
	/^access-list\s+(\d\d?)\s+(\S+)\s+(\S+)/ &&
	    ProcessHistory("ACL $1 $2","$aclsort","$3","$_") && next;

	# order logging statements
	/^logging (\d+\.\d+\.\d+\.\d+)/ &&
	    ProcessHistory("LOGGING","ipsort","$1","$_") && next;

	# order/prune snmp-server host statements
	# we only prune lines of the form
	# snmp-server host a.b.c.d <community>
	if (/^snmp-server host (\d+\.\d+\.\d+\.\d+) /) {
	    if ($filter_commstr) {
		my($ip) = $1;
		my($line) = "snmp-server host $ip";
		my(@tokens) = split(' ', $'); #'
		my($token);
		while ($token = shift(@tokens)) {
		    if ($token eq 'version') {
			$line .= " " . join(' ', ($token, shift(@tokens)));
		    } elsif ($token =~ /^(informs?|traps?|(no)?auth)$/) {
			$line .= " " . $token;
		    } else {
			$line = "!$line " . join(' ', ("<removed>", join(' ',@tokens)));
			last;
		    }
		}
		ProcessHistory("SNMPSERVERHOST","ipsort","$ip","$line\n");
	    } else {
		ProcessHistory("SNMPSERVERHOST","ipsort","$1","$_");
	    }
	    next;
	}
	if (/^(snmp-server community) (\S+)/) {
	    if (defined($ENV{'NOCOMMSTR'})) {
		ProcessHistory("SNMPSERVERCOMM","keysort","$_","!$1 <removed>$'") && next;
	    } else {
		ProcessHistory("SNMPSERVERCOMM","keysort","$_","$_") && next;
	    }
	}

	# prune tacacs/radius server keys
	if (/(.* key )\S+(.*)/ && $filter_pwds >= 1) {
	    ProcessHistory("","","","!$1<removed>$2\n"); next;
	}

	# catch anything that wasnt matched above.
	ProcessHistory("","","","$_");

    }
    # there's no end marker, so we'll just have to assume that it was complete
    $found_end = 1;
    return(1);
}

# dummy function
sub DoNothing {print STDOUT;}

# Main
@commandtable = (
    {'show system'			=> 'ShowSystem'},
    {'show version'			=> 'ShowVersion'},
    {'show startup-config'	=> 'ShowStartupConfig'}
);
# Use an array to preserve the order of the commands and a hash for mapping
# commands to the subroutine and track commands that have been completed.
@commands = map(keys(%$_), @commandtable);
%commands = map(%$_, @commandtable);

$cisco_cmds=join(";",@commands);
$cmds_regexp=join("|",@commands);

if (length($host) == 0) {
    if ($file) {
	print(STDERR "Too few arguments: file name required\n");
	exit(1);
    } else {
	print(STDERR "Too few arguments: host name required\n");
	exit(1);
    }
}
open(OUTPUT,">$host.new") || die "Can't open $host.new for writing: $!\n";
select(OUTPUT);
# make OUTPUT unbuffered if debugging
if ($debug) { $| = 1; }

if ($file) {
    print STDERR "opening file $host\n" if ($debug);
    print STDOUT "opening file $host\n" if ($log);
    open(INPUT,"<$host") || die "open failed for $host: $!\n";
} else {
    print STDERR "executing csblogin -t $timeo -c\"$cisco_cmds\" $host\n" if ($debug);
    print STDOUT "executing csblogin -t $timeo -c\"$cisco_cmds\" $host\n" if ($log);
    if (defined($ENV{NOPIPE})) {
	system "csblogin -t $timeo -c \"$cisco_cmds\" $host </dev/null > $host.raw 2>&1" || die "csblogin failed for $host: $!\n";
	open(INPUT, "< $host.raw") || die "csblogin failed for $host: $!\n";
    } else {
	open(INPUT,"csblogin -t $timeo -c \"$cisco_cmds\" $host </dev/null |") || die "csblogin failed for $host: $!\n";
    }
}

# determine ACL sorting mode
if ($ENV{"ACLSORT"} =~ /no/i) {
    $aclsort = "";
}
# determine community string filtering mode
if (defined($ENV{"NOCOMMSTR"}) &&
    ($ENV{"NOCOMMSTR"} =~ /yes/i || $ENV{"NOCOMMSTR"} =~ /^$/)) {
    $filter_commstr = 1;
} else {
    $filter_commstr = 0;
}
# determine password filtering mode
if ($ENV{"FILTER_PWDS"} =~ /no/i) {
    $filter_pwds = 0;
} elsif ($ENV{"FILTER_PWDS"} =~ /all/i) {
    $filter_pwds = 2;
} else {
    $filter_pwds = 1;
}

ProcessHistory("","","","!RANCID-CONTENT-TYPE: cisco-sb\n!\n");
ProcessHistory("COMMENTS","keysort","B0","!\n");	# show version
ProcessHistory("COMMENTS","keysort","C0","!\n");	# show package
ProcessHistory("COMMENTS","keysort","D0","!\n");	# show hardware
ProcessHistory("COMMENTS","keysort","Z0","!\n");
$clean_run=1;
TOP: while(<INPUT>) {
    tr/\015//d;
    if (/^Error:/) {
	print STDOUT ("$host csblogin error: $_");
	print STDERR ("$host csblogin error: $_") if ($debug);
	$clean_run=0;
	last;
    }
    while (/#\s*($cmds_regexp)\s*$/) {
	$cmd = $1;
	if (!defined($prompt)) {
	    $prompt = ($_ =~ /^([^#]+#)/)[0];
	    $prompt =~ s/([][}{)(\\])/\\$1/g;
	}
	print STDERR ("HIT COMMAND:$_") if ($debug);
	if (! defined($commands{$cmd})) {
	    print STDERR "$host: found unexpected command - \"$cmd\"\n";
	    $clean_run = 0;
	    last TOP;
	}
	$rval = &{$commands{$cmd}};
	delete($commands{$cmd});
	if ($rval == -1) {
	    $clean_run = 0;
	    last TOP;
	}
    }
}
print STDOUT "Done $logincmd: $_\n" if ($log);
# Flush History
ProcessHistory("","","","");
# Cleanup
close(INPUT);
close(OUTPUT);

if (defined($ENV{NOPIPE})) {
    unlink("$host.raw") if (! $debug);
}

# check for completeness
if (scalar(%commands) || !$clean_run || !$found_end) {
    if (scalar(%commands)) {
	printf(STDOUT "$host: missed cmd(s): %s\n", join(',', keys(%commands)));
	printf(STDERR "$host: missed cmd(s): %s\n", join(',', keys(%commands))) if ($debug);
    }
    if (!$clean_run || !$found_end) {
	print STDOUT "$host: End of run not found\n";
	print STDERR "$host: End of run not found (clean_run=$clean_run, found_end=$found_end)\n" if ($debug);
	system("/usr/bin/tail -1 $host.new");
    }
    unlink "$host.new" if (! $debug);
}