sslh/t_load

#! /usr/bin/perl -w

# Test script for sslh -- mass communication

# This creates many clients that perform concurrent
# connections, disconnect at any time, and try to generally
# behave as badly as possible.

# It can be used to test sslh behaves properly with many
# clients, however its main use is to get an idea of how
# much load it can take on your system before things start
# to go wrong.

use strict;
use IO::Socket::INET6;
use Data::Dumper;

## BEGIN TEST CONFIG

# Do we test sslh-select or sslh-fork?
my $sslh_binary = "./sslh-select";

# How many clients to we start for each protocol?
my $NUM_CNX = 30;

# Delay between starting new processes when starting up. If
# you start 200 processes in under a second, things go wrong
# and it's not sslh's fault (typically the echosrv won't be
# forking fast enough).
my $start_time_delay = 0.5;

# If you test 4 protocols, you'll start $NUM_CNX * 4 clients
# (e.g. 40), starting one every $start_time_delay seconds.

# Max times we repeat the test string: allows to test for
# large messages.
my $block_rpt = 4096;

# Probability to stop a client after a message (e.g. with
# .01 a client will send an average of 100 messages before
# disconnecting).
my $stop_client_probability = .001;

# What protocols we test, and on what ports
# Just comment out protocols you don't want to use.
my %protocols = (
    "ssh" => { address => "localhost:9001", client => client("ssh") },
    "ssl" => { address => "localhost:9002", client => client("ssl") },
    "openvpn" => {address => "localhost:9003", client => client("openvpn") },
    "tinc" => {address => "localhost:9004", client => client("tinc") },
);

##END CONFIG


# We use ports 9000, 9001 and 9002 -- hope that won't clash
# with anything...
my $sslh_address = "localhost:9000";
my $pidfile = "/tmp/sslh_test.pid";

sub client {
    my ($service) = @_;

    return sub {
        while (1) {
            my $cnx = new IO::Socket::INET(PeerHost => $sslh_address);
            my $test_data = "$service testing " x int(rand($block_rpt)+1) . "\n";

            sleep 5 if $service eq "ssh";
            if ($service eq "openvpn") {
                syswrite $cnx, "\x00\x0F\x38\n";
                my $msg;
                sysread $cnx, $msg, 14; # length "openvpn: \x0\xF\x38\n" => 14
            }
            if ($service eq "tinc") {
                syswrite $cnx, "0 \n";
                my $msg;
                sysread $cnx, $msg, 10; # length "tinc: 0 \n" => 10 
            }
            while (1) {
                print $cnx $test_data;
                my $r = <$cnx>;
                ($? = 1, die "$service got [$r]\n") if ($r ne "$service: $test_data");
                last if rand(1) < $stop_client_probability;
            }
        }
        exit 0;
    }
}

foreach my $p (keys %protocols) {
    if (!fork) {
        exec "./echosrv --listen $protocols{$p}->{address} --prefix '$p: '";
    }
}

# Start sslh with the right plumbing
my $sslh_pid;
if (!($sslh_pid = fork)) {
    my $user = (getpwuid $<)[0]; # Run under current username
    my $prots = join " ", map "--$_ $protocols{$_}->{address}", keys %protocols;
    my $cmd = "$sslh_binary -f -t 3 -u $user --listen $sslh_address $prots -P $pidfile";
    print "$cmd\n";
    exec $cmd;
    exit 0;
}
warn "spawned $sslh_pid\n";
sleep 2;  # valgrind can be heavy -- wait 5 seconds


for (1 .. $NUM_CNX) {
    foreach my $p (keys %protocols) {
        if (!fork) {
            warn "starting $p\n";
            &{$protocols{$p}->{client}};
            exit;
        }
        # Give a little time so we don't overrun the
        # listen(2) backlog.
        select undef, undef, undef, $start_time_delay;
    }
}

wait;


`killall echosrv`;