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# -*- perl -*-
#
# INetSim::Dummy::TCP - A dummy TCP server
#
# (c)2008-2010 Matthias Eckert, Thomas Hungenberg
#
# Version 0.7 (2010-04-12)
#
# For history/changelog see bottom of this file.
#
#############################################################
package INetSim::Dummy::TCP;
use strict;
use warnings;
use base qw(INetSim::Dummy);
sub configure_hook {
my $self = shift;
$self->{server}->{host} = &INetSim::Config::getConfigParameter("Default_BindAddress"); # bind to address
$self->{server}->{port} = &INetSim::Config::getConfigParameter("Dummy_TCP_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("Dummy_TCP_ServiceName");
$self->{max_childs} = &INetSim::Config::getConfigParameter("Default_MaxChilds");
$self->{timeout} = &INetSim::Config::getConfigParameter("Default_TimeOut");
# banner to send
$self->{Banner} = &INetSim::Config::getConfigParameter("Dummy_Banner");
# time to wait, before the banner will be send
$self->{Wait} = &INetSim::Config::getConfigParameter("Dummy_BannerWait");
}
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 $line;
my $got_data = 0;
&INetSim::Log::SubLog("[$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 {
# if dummy_banner_wait > 0 (=enabled)
if ($self->{Wait}) {
# wait for client input until $banner_wait timeout
eval {
local $SIG{'ALRM'} = sub { die "TIMEOUT1" };
alarm($self->{Wait});
while ($line = <$client>) {
alarm($self->{Wait});
$self->log_recv($line);
$stat_success = 1;
# one line is enough, get more in the next eval-loop
last;
}
alarm(0);
};
# no input ? -> send banner string ;-)
if ($@ =~ /TIMEOUT1/) {
print $client "$self->{Banner}\r\n";
if ($self->{Banner} ne "") {
&INetSim::Log::SubLog("[$rhost:$rport] send: $self->{Banner}", $self->{servicename}, $$);
}
else {
# log cr/lf human readable :-)
&INetSim::Log::SubLog("[$rhost:$rport] send: <CRLF>", $self->{servicename}, $$);
}
}
}
# now wait for client input until default timeout
eval {
local $SIG{'ALRM'} = sub { die "TIMEOUT2" };
alarm($self->{timeout});
while ($line = <$client>) {
alarm($self->{timeout});
$self->log_recv($line);
$stat_success = 1;
}
alarm(0);
};
}
if ($@ =~ /TIMEOUT2/) {
&INetSim::Log::SubLog("[$rhost:$rport] disconnect (timeout)", $self->{servicename}, $$);
}
else {
&INetSim::Log::SubLog("[$rhost:$rport] disconnect", $self->{servicename}, $$);
}
&INetSim::Log::SubLog("[$rhost:$rport] stat: $stat_success", $self->{servicename}, $$);
}
sub log_recv {
my ($self, $string) = @_;
my $rhost = $self->{server}->{peeraddr};
my $rport = $self->{server}->{peerport};
if (defined $string) {
$string =~ s/^[\r\n]+//g;
&INetSim::Log::SubLog("[$rhost:$rport] recv: $string", $self->{servicename}, $$);
}
}
1;
#############################################################
#
# History:
#
# Version 0.7 (2010-04-12) me
# - do not filter non-printable characters because it's already
# implemented in the log module
#
# Version 0.6 (2009-10-28) me
# - improved some code parts
# - added logging of status
#
# Version 0.5 (2008-09-26) me
# - added use of config parameters 'Dummy_Banner' and
# 'Dummy_BannerWait' instead of fixed values
#
# Version 0.4 (2008-09-25) me
# - added support for generic banner after first 5 seconds
# with no data from client
#
# Version 0.3 (2008-08-27) me
# - added logging of process id
#
# Version 0.2 (2008-03-19) me
# - added timeout after inactivity of n seconds, using new
# config parameter Default_TimeOut
#
# Version 0.1 (2008-03-06) me
# - initial version
#
#############################################################
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