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|
# -*- perl -*-
#
# INetSim::Ident - A fake Ident server
#
# RFC 1413 - Identification Protocol
#
# (c)2007-2019 Matthias Eckert, Thomas Hungenberg
#
#############################################################
package INetSim::Ident;
use strict;
use warnings;
use base qw(INetSim::GenericServer);
my %LPORT = ( 7 => "inetd",
9 => "inetd",
13 => "inetd",
17 => "inetd",
19 => "inetd",
20 => "ftp",
21 => "ftp",
25 => "postfix",
37 => "inetd",
53 => "named",
80 => "www-data",
113 => "identd",
443 => "www-data",
515 => "lpr",
8080 => "proxy"
);
sub configure_hook {
my $self = shift;
$self->{server}->{host} = INetSim::Config::getConfigParameter("Default_BindAddress"); # bind to address
$self->{server}->{port} = INetSim::Config::getConfigParameter("Ident_BindPort"); # bind to port
$self->{server}->{proto} = 'tcp'; # TCP protocol
$self->{server}->{user} = INetSim::Config::getConfigParameter("Default_RunAsUser"); # user to run as
$self->{server}->{group} = INetSim::Config::getConfigParameter("Default_RunAsGroup"); # group to run as
$self->{server}->{setsid} = 0; # do not daemonize
$self->{server}->{no_client_stdout} = 1; # do not attach client to STDOUT
$self->{server}->{log_level} = 0; # do not log anything
$self->{servicename} = INetSim::Config::getConfigParameter("Ident_ServiceName");
$self->{max_childs} = INetSim::Config::getConfigParameter("Default_MaxChilds");
$self->{timeout} = INetSim::Config::getConfigParameter("Default_TimeOut");
}
sub pre_loop_hook {
my $self = shift;
$0 = "inetsim_$self->{servicename}";
INetSim::Log::MainLog("started (PID $$)", $self->{servicename});
}
sub pre_server_close_hook {
my $self = shift;
INetSim::Log::MainLog("stopped (PID $$)", $self->{servicename});
}
sub fatal_hook {
my $self = shift;
INetSim::Log::MainLog("failed!", $self->{servicename});
exit 0;
}
sub process_request {
my $self = shift;
my $client = $self->{server}->{client};
my $rhost = $self->{server}->{peeraddr};
my $rport = $self->{server}->{peerport};
my $stat_success = 0;
my ($s_port, $c_port);
INetSim::Log::SubLog("[$rhost:$rport] connect", $self->{servicename}, $$);
if ($self->{server}->{numchilds} >= $self->{max_childs}) {
print $client "Maximum number of connections ($self->{max_childs}) exceeded.\n";
INetSim::Log::SubLog("[$rhost:$rport] Connection refused - maximum number of connections ($self->{max_childs}) exceeded.", $self->{servicename}, $$);
}
else {
eval {
local $SIG{'ALRM'} = sub { die "TIMEOUT" };
alarm($self->{timeout});
while (my $line = <$client>){
$line =~ s/[\r\n]+\z//g;
$line =~ s/[\s\t]+//g;
alarm($self->{timeout});
INetSim::Log::SubLog("[$rhost:$rport] recv: ".$line, $self->{servicename}, $$);
if ($line =~ /\A\d{1,5}\,\d{1,5}\z/) {
($s_port, $c_port) = split(/\,/, $line);
if ($s_port >= 1 && $s_port <= 65535 && $c_port >= 1 && $c_port <= 65535) {
my $out;
if (defined $LPORT{$s_port} && $LPORT{$s_port}) {
$out = "$s_port , $c_port : USERID : UNIX : $LPORT{$s_port}";
}
elsif ($s_port <= 1024) {
$out = "$s_port , $c_port : USERID : UNIX : root";
}
else {
$out = "$s_port , $c_port : USERID : UNIX : nobody";
}
print $client "$out\r\n";
INetSim::Log::SubLog("[$rhost:$rport] send: $out", $self->{servicename}, $$);
$stat_success = 1;
}
else {
print $client "$s_port , $c_port : ERROR : INVALID-PORT\r\n";
INetSim::Log::SubLog("[$rhost:$rport] send: $s_port , $c_port : ERROR : INVALID-PORT", $self->{servicename}, $$);
}
}
elsif ($line =~ /\AQUIT\z/i) {
last;
}
else {
print $client "0 , 0 : ERROR : UNKNOWN-ERROR\r\n";
INetSim::Log::SubLog("[$rhost:$rport] send: 0 , 0 : ERROR : UNKNOWN-ERROR", $self->{servicename}, $$);
last;
}
alarm($self->{timeout});
}
alarm(0);
};
}
if ($@ =~ /TIMEOUT/) {
INetSim::Log::SubLog("[$rhost:$rport] disconnect (timeout)", $self->{servicename}, $$);
}
else {
INetSim::Log::SubLog("[$rhost:$rport] disconnect", $self->{servicename}, $$);
}
if ($stat_success == 1) {
INetSim::Log::SubLog("[$rhost:$rport] stat: $stat_success lport=$s_port rport=$c_port", $self->{servicename}, $$);
}
else {
INetSim::Log::SubLog("[$rhost:$rport] stat: $stat_success", $self->{servicename}, $$);
}
}
1;
#
|
