ObjFW  Check-in [c4b7136091]

	const unsigned char zeroNode[IPX_NODE_LEN] = { 0 };
	void *pool = objc_autoreleasePoolPush();
	OFIPXSocket *sock;
	OFSocketAddress address1, address2;
	OFDictionary *networkInterfaces;
	char buffer[5];
	unsigned char node1[IPX_NODE_LEN], node2[IPX_NODE_LEN];
	unsigned char node[IPX_NODE_LEN];

	TEST(@"+[socket]", (sock = [OFIPXSocket socket]))

	@try {
		TEST(@"-[bindToNetwork:node:port:packetType:]",
		R(address1 = [sock bindToNetwork: 0
					    node: zeroNode

	 */
	networkInterfaces = [OFSystemInfo networkInterfaces];
	for (OFString *name in networkInterfaces) {
		OFNetworkInterface interface = [networkInterfaces
		    objectForKey: name];
		OFData *addresses = [interface
		    objectForKey: OFNetworkInterfaceIPXAddresses];
		unsigned char node[IPX_NODE_LEN];

		if (addresses.count == 0)
			continue;

		OFSocketAddressSetIPXNetwork(&address1,
		    OFSocketAddressIPXNetwork([addresses itemAtIndex: 0]));
		OFSocketAddressGetIPXNode([addresses itemAtIndex: 0], node);
		OFSocketAddressSetIPXNode(&address1, node);
	}

	OFSocketAddressGetIPXNode(&address1, node);
	if (OFSocketAddressIPXNetwork(&address1) == 0 &&
	    memcmp(node, zeroNode, 6) == 0) {
		[OFStdOut setForegroundColor: [OFColor lime]];
		[OFStdOut writeLine:
		    @"[OFIPXSocket] -[sendBuffer:length:receiver:]: "
		    @"Could not determine own address, skipping tests"];
		objc_autoreleasePoolPop(pool);
		return;
	}

	TEST(@"-[sendBuffer:length:receiver:]",
	    R([sock sendBuffer: "Hello" length: 5 receiver: &address1]))

	TEST(@"-[receiveIntoBuffer:length:sender:]",
	    [sock receiveIntoBuffer: buffer length: 5 sender: &address2] == 5 &&
	    memcmp(buffer, "Hello", 5) == 0 &&