nixpkgs/nixos/tests/bittorrent.nix

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# This test runs a Bittorrent tracker on one machine, and verifies
# that two client machines can download the torrent using
# `transmission'. The first client (behind a NAT router) downloads
# from the initial seeder running on the tracker. Then we kill the
# initial seeder. The second client downloads from the first client,
# which only works if the first client successfully uses the UPnP-IGD
# protocol to poke a hole in the NAT.
{ pkgs, ... }:
let
# Some random file to serve.
file = pkgs.nixUnstable.src;
miniupnpdConf = nodes: pkgs.writeText "miniupnpd.conf"
''
ext_ifname=eth1
listening_ip=${nodes.router.config.networking.interfaces.eth2.ipAddress}/24
allow 1024-65535 192.168.2.0/24 1024-65535
'';
in
{
nodes =
{ tracker =
{ config, pkgs, ... }:
{ environment.systemPackages = [ pkgs.transmission pkgs.bittorrent ];
# We need Apache on the tracker to serve the torrents.
services.httpd.enable = true;
services.httpd.adminAddr = "foo@example.org";
services.httpd.documentRoot = "/tmp";
};
router =
{ config, pkgs, ... }:
{ environment.systemPackages = [ pkgs.miniupnpd ];
virtualisation.vlans = [ 1 2 ];
networking.nat.enable = true;
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networking.nat.internalIPs = [ "192.168.2.0/24" ];
networking.nat.externalInterface = "eth1";
};
client1 =
{ config, pkgs, nodes, ... }:
{ environment.systemPackages = [ pkgs.transmission ];
virtualisation.vlans = [ 2 ];
networking.defaultGateway =
nodes.router.config.networking.interfaces.eth2.ipAddress;
};
client2 =
{ config, pkgs, ... }:
{ environment.systemPackages = [ pkgs.transmission ];
};
};
testScript =
{ nodes, ... }:
''
startAll;
# Enable NAT on the router and start miniupnpd.
$router->waitForUnit("nat");
$router->succeed(
"iptables -t nat -N MINIUPNPD",
"iptables -t nat -A PREROUTING -i eth1 -j MINIUPNPD",
"echo 1 > /proc/sys/net/ipv4/ip_forward",
"miniupnpd -f ${miniupnpdConf nodes}"
);
# Create the torrent.
$tracker->succeed("mkdir /tmp/data");
$tracker->succeed("cp ${file} /tmp/data/test.tar.bz2");
$tracker->succeed("transmission-create /tmp/data/test.tar.bz2 -t http://tracker:6969/announce -o /tmp/test.torrent");
$tracker->succeed("chmod 644 /tmp/test.torrent");
# Start the tracker. !!! use a less crappy tracker
$tracker->waitForUnit("network.target");
$tracker->succeed("bittorrent-tracker --port 6969 --dfile /tmp/dstate >&2 &");
$tracker->waitForOpenPort(6969);
# Start the initial seeder.
my $pid = $tracker->succeed("transmission-cli /tmp/test.torrent -M -w /tmp/data >&2 & echo \$!");
# Now we should be able to download from the client behind the NAT.
$tracker->waitForUnit("httpd");
$client1->waitForUnit("network.target");
$client1->succeed("transmission-cli http://tracker/test.torrent -w /tmp >&2 &");
$client1->waitForFile("/tmp/test.tar.bz2");
$client1->succeed("cmp /tmp/test.tar.bz2 ${file}");
# Bring down the initial seeder.
$tracker->succeed("kill -9 $pid");
# Now download from the second client. This can only succeed if
# the first client created a NAT hole in the router.
$client2->waitForUnit("network.target");
$client2->succeed("transmission-cli http://tracker/test.torrent -M -w /tmp >&2 &");
$client2->waitForFile("/tmp/test.tar.bz2");
$client2->succeed("cmp /tmp/test.tar.bz2 ${file}");
'';
}