#!/usr/local/bin/perl -w
# findport - find a server running at an unknown TCP port
# <title>findport.pl</title>
# Copyright (C) 1996 by John J. Chew
unshift(@INC, "$ENV{HOME}/lib/perl");
require 'getopts.pl';
require 'sys/socket.ph';
sub Usage {
die "Usage: $0 [-m] [-O] [-q] host [start-port]\n".
"-m allow multiple matches\n".
"-O try `obvious' ports\n".
"-q be quiet\n".
"";
}
&Getopts('mOq') || &Usage;
$#ARGV < $[ && &Usage;
$#ARGV > $[ + 1 && &Usage;
$#ARGV > $[ && $opt_O && &Usage;
($serverhostname, $serverportname) = @ARGV;
$serverportname = 7777 unless defined $serverportname;
@gObvious = (
# popular port numbers for MOOs
7777, 8888, 6666, 6969, 1234, 1701, 4444, 2112, 2499, 4000, 8000, 9595,
1138, 1359, 1709, 1848, 1961, 1975, 1996, 2000, 2001, 2029, 2345, 3000,
3175, 4201, 4242, 5000, 5678, 6464, 7000, 7007, 7200, 7700, 7878, 8080,
8889, 9000, 9020, 9030, 9040, 9999, 3434,
# other `obvious' numbers
1111, 1112, 1113, 1996, 1997, 1998, 1999, 2222, 2223, 2224, 3001, 3333,
3334, 3335, 3456, 4001, 4445, 4446, 4567, 5001, 5556, 5557, 6000, 6001,
6667, 6668, 6789, 7001, 7778, 7779, 7890, 8001, 9001,
);
sub die { die $_[0] unless $opt_q; exit 1; }
sub lint { $opt_m; }
$sockaddr_t = 'S n a4 x8';
($name, $aliases, $protocol) = getprotobyname('tcp');
socket(S, &PF_INET, &SOCK_STREAM, $protocol) || &die("socket() failed:
$!");
chop($clienthostname = `hostname`);
(($name, $aliases, $type, $length, $clientaddress)
= gethostbyname($clienthostname))
|| &die("gethostbyname($clienthostname) failed: $!");
$clientname = pack($sockaddr_t, &AF_INET, 0, $clientaddress);
bind(S, $clientname) || &die("bind() failed: $!");
(($name, $aliases, $port) = getservbyname($serverportname, 'tcp'))
|| ($port = $serverportname);
(($name, $aliases, $type, $length, $serveraddress)
= gethostbyname($serverhostname))
|| &die("gethostbyname($ARGV[0]) failed: $!");
$| = 1;
$port = shift @gObvious if $opt_O;
while (1) {
$servername = pack($sockaddr_t, &AF_INET, $port, $serveraddress);
print "$port" unless $opt_q;
if (connect(S, $servername)) {
print "\n\a" unless $opt_q;
print "$port is active.\n";
exit 0 unless $opt_m;
}
else {
print " ";
$opt_O ? (($port = shift @gObvious) || exit) : $port++;
close(S);
socket(S, &PF_INET, &SOCK_STREAM, $protocol) || &die("socket()
failed: $!");
bind(S, $clientname) || &die("bind() failed: $!");
}
}
