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#!/usr/bin/perl -T
# Basically you need to add a line like this to /etc/inetd.conf and
# killall -HUP inetd
# ident stream tcp nowait nobody /usr/local/sbin/identd.pl
# see the advanced section of the docs for more details about this.
use strict;
use Socket;
# Prefix/tmp directory that CGI:IRC uses
my $cgiircprefix="/tmp/cgiirc-";
# How to deal with unknown requests:
# nouser reply with NO-USER
# reply:text reply with USERID 'text'
# linuxproc use /proc/net/tcp on linux to do 'real' identd relies
# forward:port forward to a real identd
my $reply = "nouser";
# Use custom ident (currently HTTP USER set by CGI:IRC).
my $customident = 0;
# Taken from midentd
my $in = '';
ret(0,0, "ERROR : NO-USER") unless sysread STDIN, $in, 128;
my($local, $remote) = $in =~ /^\s*(\d+)\s*,\s*(\d+)/;
ret(0,0, "ERROR : INVALID-PORT") unless defined $local && defined $remote;
$remote = 0 if $remote !~ /^([ \d])+$/;
$local = 0 if $local !~ /^([ \d])+$/;
if($remote<1 || $remote>65535 || $local<1 || $local>65535) {
ret($local, $remote, "ERROR : INVALID-PORT")
}
my $randomvalue = find_socket($local, $remote);
if(defined $randomvalue) {
my $user = encode_ip($randomvalue);
if($customident && -f "$cgiircprefix$randomvalue/ident") {
open(TMP, "<$cgiircprefix$randomvalue/ident") or
ret($local, $remote, "USERID : UNIX : $user");
$user = <TMP>;
chomp($user);
$user ||= encode_ip($randomvalue);
}
ret($local, $remote, "USERID : UNIX : $user");
}else{
if($reply eq 'nouser') {
ret($local, $remote, "ERROR : NO-USER");
}elsif($reply =~ /reply:\s*(.*)/) {
ret($local, $remote, "USERID : UNIX : $1");
}elsif($reply eq 'linuxproc') {
ret($local, $remote, linuxproc($local, $remote));
}elsif($reply =~ /forward:\s*(.*)/) {
print forward($1, $local, $remote);
exit;
}
ret($local, $remote, "ERROR : INVALID-PORT");
}
sub ret{
my($l, $r, $t) = @_;
print "$l , $r : $t\r\n";
exit;
}
sub find_socket {
my($l, $r) = @_;
(my $dir, my $prefix) = $cgiircprefix =~ /^(.*\/)([^\/]+)$/;
opendir(TMPDIR, $dir) or return undef;
for(readdir TMPDIR) {
next unless /^\Q$prefix\E/;
next unless -o $dir . $_ && -d $dir . $_;
local *TMP;
open(TMP, "<$dir$_/server") or next;
chomp(my $tmp = <TMP>);
next unless $tmp =~ /:$r$/;
chomp($tmp = <TMP>);
next unless $tmp =~ /:$l$/;
close TMP;
$_ = $dir . $_;
s/^\Q$cgiircprefix\E//;
return $_;
}
closedir TMPDIR;
return undef;
}
sub encode_ip {
my($rand) = @_;
open(TMP, "<$cgiircprefix$rand/ip") or return 0;
chomp(my $ip = <TMP>);
close TMP;
return join('',map(sprintf("%0.2x", $_), split(/\./, $ip)));
}
sub linuxproc {
my($l, $r) = @_;
open(PNT,"</proc/net/tcp") or return "ERROR : NO-USER";
$_=<PNT>;
while(<PNT>) {
s/^\s+//;
s/\s+/ /g;
my($sl,$local,$remote,$st,$queue,$tr,$retrnsmt,$uid,$timeout,$inode) = split(/\s/);
next unless decode_port($local) == $l && decode_port($remote) == $r;
return "USERID : UNIX : " . getusername($uid);
}
close(PNT);
return "ERROR : NO-USER";
}
sub decode_port{
return hex((split(/:/,shift,2))[1]);
}
sub getusername{
my $uid = shift;
if($_=(getpwuid($uid))[0]) {
return $_;
} else {
return $uid;
}
}
sub forward {
my($where, $l, $r) = @_;
eval("use IO::Socket;");
my $forward = IO::Socket::INET->new($where =~ /:/ ? $where : '127.0.0.1:' . $where);
return "$l , $r : ERROR : NO-USER\r\n" unless ref $forward;
print $forward "$l , $r\r\n";
return scalar <$forward>;
}
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