#!/usr/bin/env perl
#
# Prints info on all smb responding machines on a subnet.
# This script needs to be run on a machine without nmbd running and be
# run as root to get correct info from WIN95 clients.
#
# syntax:
#    findsmb [-d|-D] [-r] [subnet broadcast address]
#
# with no agrument it will list machines on the current subnet
#
# There will be a "+" in front of the workgroup name for machines that are
# local master browsers for that workgroup. There will be an "*" in front
# of the workgroup name for machines that are the domain master browser for
# that workgroup.
# 
# Options:
#
# -d|-D		enable debug
# -r		add -r option to nmblookup when finding netbios name
#

$SAMBABIN = "/usr/bin";

for ($i = 0; $i < 2; $i++) {	# test for -d and -r options
	$_ = shift;
	if (m/-d|-D/) {
		$DEBUG = 1;
	} elsif (m/-r/) {
		$R_OPTION = "-r";
	}
}

if ($_) {			# set broadcast address if it was specified
	$BCAST = "-B $_";
}


######################################################################
# do numeric sort on last field of IP address
sub ipsort			
{
	@t1 = split(/\./,$a);
	@t2 = split(/\./,$b);
	@t1[3] <=> @t2[3];
}
######################################################################

# look for all machines that respond to a name lookup

open(NMBLOOKUP,"$SAMBABIN/nmblookup $BCAST '*' --debuglevel=0|") || 
	die("Can't run nmblookup '*'.\n");

# get rid of all lines that are not a response IP address,
# strip everything but IP address and sort by last field in address

@ipaddrs = sort ipsort grep(s/ \*<00>.*$//,<NMBLOOKUP>);

# print header info
print "\n                                *=DMB\n";
print "                                +=LMB\n";
print "IP ADDR         NETBIOS NAME     WORKGROUP/OS/VERSION $BCAST\n";
print "---------------------------------------------------------------------\n";

foreach $ip (@ipaddrs)		# loop through each IP address found
{
	$ip =~ s/\n//;		# strip newline from IP address

	# find the netbios names registered by each machine

	open(NMBLOOKUP,"$SAMBABIN/nmblookup $R_OPTION -A $ip --debuglevel=0|") || 
		die("Can't get nmb name list.\n");
	@nmblookup = <NMBLOOKUP>;
  	close NMBLOOKUP;

	# get the first <00> name

	@name = grep(/<00>/,@nmblookup);
	$_ = @name[0];

	if ($_) {			# we have a netbios name
		if (/GROUP/) {		# is it a group name
			($name, $aliases, $type, $length, @addresses) = 
			gethostbyaddr(pack('C4',split('\.',$ip)),2);
			if (! $name) {			# could not get name
				$name = "unknown nis name";
			}
		} else {
			# The Netbios name can contain lot of characters also '<' '>'
			# and spaces. The following cure inside name space but not
			# names starting or ending with spaces
			/(.{1,15})\s+<00>\s+/;
			$name = $1;
			$name =~ s/^\s+//g;
    		}

		# do an smbclient command on the netbios name.

		if ( "$name" ) {
			open(SMB,"$SAMBABIN/smbclient -L $name -I $ip -N --debuglevel=1 2>&1 |") ||
				die("Can't do smbclient command.\n");
			@smb = <SMB>;
			close SMB;

			if ($DEBUG) {		# if -d flag print results of nmblookup and smbclient
				print "===============================================================\n";
				print @nmblookup;
				print @smb;
			}

			# look for the OS= string

			@info = grep(/OS=/,@smb);
			$_ = @info[0];
			if ($_) {				# we found response
				s/Domain=|OS=|Server=|\n//g;	# strip out descriptions to make line shorter

			} else {				# no OS= string in response (WIN95 client)

				# for WIN95 clients get workgroup name from nmblookup response
				@name = grep(/<00> - <GROUP>/,@nmblookup);
				$_ = @name[0];
				if ($_) {
					# Same as before for space and characters
					/(.{1,15})\s+<00>\s+/;
					$_ = "[$1]";
				} else {
					$_ = "Unknown Workgroup";
				}
			}
		}

		# see if machine registered a local master browser name
		if (grep(/<1d>/,@nmblookup)) {
			$master = '+';			# indicate local master browser
			if (grep(/<1b>/,@nmblookup)) {	# how about domain master browser?
				$master = '*';			# indicate domain master browser
			}
		} else {
			$master = ' ';			# not a browse master
		}

		# line up info in 3 columns

		print "$ip".' 'x(16-length($ip))."$name".' 'x(14-length($name))."$master"."$_\n";

	} else {				# no netbios name found
		# try getting the host name
		($name, $aliases, $type, $length, @addresses) = 
		gethostbyaddr(pack('C4',split('\.',$ip)),2);
		if (! $name) {			# could not get name
			$name = "unknown nis name";
		}
		if ($DEBUG) {			# if -d flag print results of nmblookup
			print "===============================================================\n";
			print @nmblookup;
		}
		print "$ip".' 'x(16-length($ip))."$name\n";
	}
}