#! /usr/bin/perl
# By Damian Fantini
# usage: vrancid [-dV] [-l] [-f filename | hostname]
#
use Getopt::Std;
getopts('dflV');
if ($opt_V) {
    print "vrancid 3.0\n";
    exit(0);
}
$debug = $opt_d;
$log = $opt_l;
$file = $opt_f;
$host = $ARGV[0];

$clean_run = 0;
$found_end = 0;
$timeo = 120;				# clogin timeout in seconds

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

# 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 $command))
	&& scalar(%history)) {
	print eval "$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);
}

###
### Start of real work
###



# This routine parses "show configuration"
sub ShowConfiguration {
    my($lines) = 0;
    my($snmp) = 0;
    print STDERR "    In ShowConfiguration: $_" if ($debug);

    ProcessHistory("","","","# $_");
    while (<INPUT>) {
	tr/\015//d;
	next if (/^\s*$/);
	# end of config - hopefully.  VyOS does not have a reliable
	# end-of-config tag.  appears to end with "\nPROMPT>", but not sure.
	if (/$prompt/) {
	    $found_end++;
	    last;
	}
	next if (/^system (shutdown message from|going down )/i);
	next if (/^\{(master|backup)(:\d+)?\}/);

	# Remove Uptime
	next if (/^uptime/i);
	# Sometimes the 'show' commands are echoed back
	next if (/^show/);
	next if (/^exit/);

	$lines++;

	/^database header mismatch: / && return(-1);
	/^version .*;\d+$/ && return(-1);

	s/ # SECRET-DATA$//;
	s/ ## SECRET-DATA$//;
	# filter snmp community, when in snmp { stanza }
	/^\s*snmp/ && $snmp++;
	/^}/ && ($snmp = 0);
	if ($snmp && /^(\s*)(community|trap-group) [^ ;]+(\s?[;{])$/) {
		if ($filter_commstr) {
		    $_ = "$1$2 \"<removed>\"$3\n";
		}
	}

	if (/^(.* snmp community) [^ ;]+(\s?.*)$/) {
		if ($filter_commstr) {
		    $_ = "$1 \"<removed>\"$2\n";
		}
	}
	if (/^(.* snmp .*-key) [^ ;]+(\s?.*)$/) {
		if ($filter_commstr) {
		    $_ = "$1 \"<removed>\"$2\n";
		}
	}
	if (/(\s*authentication-key )[^ ;]+/ && $filter_pwds >= 1) {
	    ProcessHistory("","","","#$1<removed>$'");
	    next;
	}
	if (/(\s*md5 \d+ key )[^ ;]+/ && $filter_pwds >= 1) {
	    ProcessHistory("","","","#$1<removed>$'");
	    next;
	}
	if (/(\s*hello-authentication-key )[^ ;]+/ && $filter_pwds >= 1) {
	    ProcessHistory("","","","#$1<removed>$'");
	    next;
	}
	# don't filter this one - there is no secret here.
	if (/^\s*permissions .* secret /) {
	    ProcessHistory("","","","$_");
	    next;
	}
	if (/^(.*\ssecret )[^ ;]+/ && $filter_pwds >= 1) {
	    ProcessHistory("","","","#$1<removed>$'");
	    next;
	}
	if (/(.* encrypted-password )[^ ;]+/ && $filter_pwds >= 2) {
	    ProcessHistory("","","","#$1<removed>\n");
	    next;
	}
	if (/(\s+ssh-(rsa|dsa) )\"/ && $filter_pwds >= 2) {
	    ProcessHistory("","","","#$1<removed>;\n");
	    next;
	}
	if (/^(\s+(pre-shared-|)key (ascii-text|hexadecimal) )[^ ;]+/ && $filter_pwds >= 1) {
	    ProcessHistory("","","","#$1<removed>$'");
	    next;
	}
	ProcessHistory("","","","$_");
    }

    if ($lines < 1) {
	printf(STDERR "ERROR: $host configuration appears truncated.\n");
	$found_end = 0;
	return(-1);
    }

    return(0);
}

###
### End of real work
###

# dummy function
sub DoNothing {print STDOUT;}

# Main
@commandtable = (
	{'show version'			=> 'ShowConfiguration'},
	{'show system image'		=> 'ShowConfiguration'},
	{'show hardware cpu'		=> 'ShowConfiguration'},
	{'show configuration'		=> 'ShowConfiguration'},
	{'show system routing-daemons'	=> 'ShowConfiguration'},
);
# 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);

$jnx_commands=join(";",@commands);
$cmds_regexp = join("|", map quotemeta($_), @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: $!\n";
select(OUTPUT);
# make OUTPUT unbuffered
if ($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 echo uelogin -t $timeo -c\"$jnx_commands\" $host\n") if ($debug);

    if (defined($ENV{NOPIPE})) {
	system "uelogin -t $timeo -c \"$jnx_commands\" $host </dev/null > $host.raw" || die "uelogin failed for $host: $!\n";
	open(INPUT, "< $host.raw") || die "uelogin failed for $host: $!\n";
    } else {
	open(INPUT,"uelogin -t $timeo -c \"$jnx_commands\" $host </dev/null |") || die "uelogin 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: ubnt-er\n#\n");
TOP: while (<INPUT>) {
    tr/\015//d;
    if (/^Error:/) {
	print STDOUT ("$host uelogin error: $_");
	print STDERR ("$host uelogin error: $_") if ($debug);
	$clean_run=0;
	last;
    }
    if (/System shutdown message/) {
	print STDOUT ("$host shutdown msg: $_");
	print STDERR ("$host shutdown msg: $_") if ($debug);
	$clean_run = 0;
	last;
    }
    if (/error: cli version does not match Managment Daemon/i) {
	print STDOUT ("$host mgd version mismatch: $_");
	print STDERR ("$host mgd version mismatch: $_") if ($debug);
	$clean_run = 0;
	last;
    }
    while (/\s*($cmds_regexp)\s*$/) {
	$cmd = $1;
	$prompt = ":~";
 
	if (!defined($prompt)) {
	    $prompt = ($_ =~ /^([^>]+$)/)[0];
	    $prompt =~ s/([][}{)(\\])/\\$1/g;
	    print STDERR ("PROMPT MATCH: $prompt\n") if ($debug);
	
	}
	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;
	}
    }
    if (/\s*exit/) {
	$clean_run=1;
	last;
    }
}
print STDOUT "Done uelogin: $_\n" if ($log);
# Flush History
ProcessHistory("","","","");
# Cleanup
close(INPUT);
close(OUTPUT);

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

# check for completeness
$commands = join(", ", keys(%commands));
if (scalar(%commands) || !$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\n" if ($debug);
	system("/usr/bin/tail -1 $host.new");
    }
    unlink "$host.new" if (! $debug);
}