#!/usr/bin/perl

use strict;
use warnings;
use Socket;
use UUID;
use BSD::Resource;
use Getopt::Long;
use Socket6;

my ($NUM, $RUNTIME) = (1000, 30);
my ($NODEL, $IP, $IPV6, $KEEPGOING);
GetOptions(
		'no-delete'	=> \$NODEL,
		'num-calls=i'	=> \$NUM,
		'local-ip=s'	=> \$IP,
		'local-ipv6=s'	=> \$IPV6,
		'runtime=i'	=> \$RUNTIME,
		'keep-going'	=> \$KEEPGOING,		# don't stop sending rtp if a packet doesn't go through
) or die;

($IP || $IPV6) or die("at least one of --local-ip or --local-ipv6 must be given");

$SIG{ALRM} = sub { print "alarm!\n"; };
setrlimit(RLIMIT_NOFILE, 8000, 8000);

my @chrs = ('a' .. 'z', 'A' .. 'Z', '0' .. '9');
sub rand_str {
	my ($len) = @_;
	return join('', (map {$chrs[rand(@chrs)]} (1 .. $len)));
}

my $fd;
sub msg {
	my ($l) = @_;
	my $cookie = $$ . '_' . rand_str(10);
	my $r;
	while (1) {
		send($fd, "$cookie $l", 0) or die $!;
		my $err = '';
		alarm(1);
		recv($fd, $r, 0xffff, 0) or $err = "$!";
		alarm(0);
		$err =~ /interrupt/i and next;
		$err and die $err;
		last;
	}
	$r =~ s/^\Q$cookie\E +//s or die $r;
	$r =~ s/[\r\n]+$//s;
	return $r;
}

socket($fd, AF_INET, SOCK_DGRAM, 0) or die $!;
connect($fd, sockaddr_in(12222, inet_aton("127.0.0.1"))) or die $!;

msg('V') eq '20040107' or die;

my @calls;

sub do_rtp {
	print("sending rtp\n");
	for my $c (@calls) {
		$c or next;
		my ($fds,$outputs,$protos) = @$c[0,4,6];
		for my $i ([0,1],[1,0]) {
			my ($a, $b) = @$i;
			my $pr = $$protos[$a];
			my $payload = rand_str(100);
			send($$fds[$a], $payload, 0, $$pr{sockaddr}($$outputs[$b][0],
				inet_pton($$pr{family}, $$outputs[$b][1]))) or die $!;
			my $x;
			my $err = '';
			alarm(1);
			recv($$fds[$b], $x, 0xffff, 0) or $err = "$!";
			alarm(0);
			$err && $err !~ /interrupt/i and die $err;
			if (($x || '') ne $payload) {
				warn("no rtp reply received, ports $$outputs[$b][0] and $$outputs[$a][0]");
				$KEEPGOING or undef($c);
			}
		}
	}
}

my %proto_defs = (
	ipv4 => {
		code		=> 'I',
		family		=> AF_INET,
		reply		=> '4',
		address		=> $IP,
		sockaddr	=> \&sockaddr_in,
	},
	ipv6 => {
		code		=> 'E',
		family		=> AF_INET6,
		reply		=> '6',
		address		=> $IPV6,
		sockaddr	=> \&sockaddr_in6,
	},
);
my @protos_avail;
$IP and push(@protos_avail, $proto_defs{ipv4});
$IPV6 and push(@protos_avail, $proto_defs{ipv6});

for my $iter (1 .. $NUM) {
	($iter % 10 == 0) and print("$iter\n"), do_rtp();

	my $callid = rand_str(50);

	my @protos = map {$protos_avail[int(rand(@protos_avail))]} (0,0);
	my @prefixes = qw(US LS);
	$prefixes[0] .= join('', (map {$_->{code}} @protos));
	my (@fds,@ports,@ips,@tags,@outputs);
	for my $ix ([0,1],[1,0]) {
		my ($i,$j) = @$ix;
		my ($pr,$pr_o) = @protos[@$ix];
		socket($fds[$i], $$pr{family}, SOCK_DGRAM, 0) or die $!;
		while (1) {
			my $port = rand(0x7000) << 1 + 1024;
			bind($fds[$i], $$pr{sockaddr}($port, inet_pton($$pr{family}, $$pr{address}))) and last;
		}
		my $addr = getsockname($fds[$i]);
		my $ip;
		($ports[$i], $ip) = $$pr{sockaddr}($addr);
		$ips[$i] = inet_ntop($$pr{family}, $ip);
		$tags[$i] = rand_str(15);
		my $tagstr = ($i == 1 ? "$tags[0];1 " : '') . "$tags[$i];1";
		my $o = msg("$prefixes[$i] $callid $ips[$i] $ports[$i] $tagstr");
		$o =~ /^(\d+) ([\d.a-f:]+) ([46])[\r\n]*$/is or die $o;
		$1 == 0 and die "mediaproxy ran out of ports";
		$3 ne $$pr_o{reply} and die "incorrect address family reply code";
		$outputs[$i] = [$1,$2];
	}

	push(@calls, [\(@fds,@ports,@ips,@tags,@outputs), $callid, \@protos]);
}

my $end = time() + $RUNTIME;
while (time() < $end) {
	sleep(1);
	do_rtp();
}

if (!$NODEL) {
	print("deleting\n");
	@calls = sort {rand() < .5} @calls;
	for my $c (@calls) {
		$c or next;
		my ($tags, $callid) = @$c[3,5];
		msg("D $callid $$tags[0] $$tags[1]");
	}
}
print("done\n");