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#!/usr/bin/perl -w
# create the services file from
# http://www.iana.org/assignments/enterprise-numbers
#
# Wireshark - Network traffic analyzer
# By Gerald Combs <gerald@wireshark.org>
# Copyright 2004 Gerald Combs
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
use strict;
use English;

my $svc_file = "services";
my $in = shift;
my $min_size = 2000000; # Size was 2654612 on 2011-08-31
my @exclude_pats = qw(
        ^spr-itunes
        ^spl-itunes
        ^shilp
);
my $iana_port_url = "http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.txt";

# As of August 2011, the page linked from http://www.iana.org/protocols/
# is XML. Perhaps we should parse that instead.
$in = $iana_port_url unless(defined $in);

my $body = "";

if($in =~ m/^http:/i) {
        eval "require LWP::UserAgent;";
        die "LWP isn't installed. It is part of the standard Perl module libwww." if $@;

        my $agent    = LWP::UserAgent->new;
        $agent->env_proxy;
        $agent->agent("Wireshark make-services.pl");

        warn "starting to fetch $in ...\n";

        my $request  = HTTP::Request->new(GET => $in);


        if (-f $svc_file) {
                my $mtime;
                (undef,undef,undef,undef,undef,undef,undef,$min_size,undef,$mtime,undef,undef,undef) = stat($svc_file);
                $request->if_modified_since( $mtime );
        }

        my $result   = $agent->request($request);

        if ($result->code eq 200) {
                warn "done fetching $in\n";
                my @in_lines = split /\n/, $result->content;
                my $prefix = "";
                my $exclude_match;
                my $line;
                my $pat;
                foreach $line (@in_lines) {
                        $prefix = "# ";
                        $exclude_match = 0;

                        if ($line =~ /^(\S+)\s+(\d+)\s+(tcp|udp|sctp|dccp)\s+(\S.*)/) {
                                $line = "$1     $2/$3   # $4";

                                foreach $pat (@exclude_pats) {
                                        if ($line =~ $pat) {
                                                $exclude_match = 1;
                                                last;
                                        }
                                }

                                if ($exclude_match) {
                                        $body .= "# Excluded by $PROGRAM_NAME\n";
                                } else {
                                        $prefix = "";
                                }
                        }

                        $line =~ s/^\s+|\s+$//g;

                        $body .= $prefix . $line . "\n";
                }
        } elsif ($result->code eq 304) {
                warn "$svc_file was up-to-date\n";
                exit 0;
        } else {
                die "request for $in failed with result code:" . $result->code;
        }

} else {
  open IN, "< $in";
  $body = <IN>;
  close IN;
}

if (length($body) < $min_size * 0.9) {
        die "$in doesn't have enough data\n";
}

open OUT, "> $svc_file";

print OUT <<"_HEADER";
# This is a local copy of the IANA port-numbers file.
#
# Wireshark uses it to resolve port numbers into human readable
# service names, e.g. TCP port 80 -> http.
#
# It is subject to copyright and being used with IANA's permission:
# http://www.wireshark.org/lists/wireshark-dev/200708/msg00160.html
#
# The original file can be found at:
# $iana_port_url
#
$body
_HEADER

close OUT;