Example #1
0
func listener(ctx context.Context, frameSize int, addr string) error {
	ln, err := net.Listen("tcp", addr)
	if err != nil {
		fmt.Fprintf(os.Stderr, "net.Listen(%q): %s\n", addr, err.Error())
		return err
	}
	go func() {
		<-ctx.Done()
		ln.Close()
	}()

	c, err := ln.Accept()
	if err != nil {
		fmt.Fprintf(os.Stderr, "ln.Accept(): %s\n", err.Error())
		return err
	}
	fc := fnet.FromOrderedStream(c, frameSize)
	go func() {
		<-ctx.Done()
		fc.Close()
	}()

	if err = clockstation.Run(ctx, fc, time.Tick(50*time.Millisecond)); err != nil {
		return fmt.Errorf("clockstation.Run: %s\n", err.Error())
	}
	return nil
}
Example #2
0
func run(ctx context.Context, rendID *[32]byte, seed []byte, identifiable bool, numStreams int, rnd *mathrand.Rand) error {
	tr, err := torch.New(ctx, proxy.FromEnvironment())
	if err != nil {
		return err
	}
	defer tr.Stop()

	rendNode := tr.WithDirectory(func(dir *directory.Directory) interface{} {
		shortInfos := make([]*directory.ShortNodeInfo, 0, len(dir.Routers))
		for _, n := range dir.Routers {
			if n.Fast && n.Running && n.Stable && n.Valid && (n.Port == 443 || n.Port == 80) {
				shortInfos = append(shortInfos, n.ShortNodeInfo)
			}
		}
		rendShort := nd.Pick(shortInfos, rendID)
		for _, r := range dir.Routers {
			if r.ShortNodeInfo == rendShort {
				return r
			}
		}
		panic("unreachable")
	}).(*directory.NodeInfo)

	// when we talk to a website over TOR, the website knows what the third hop
	// is. Therefore our converstion partner may as well.
	nodes := make([]*directory.NodeInfo, 0, 3)
	if !identifiable {
		nodes = append(nodes, tr.Pick(weigh, rnd))
		nodes = append(nodes, tr.Pick(weigh, rnd))
	}
	nodes = append(nodes, rendNode)

	rr := fnet.NewRoundRobin(nd.FRAMESIZE)
	defer rr.Close()

	fmt.Println("plan:")
	for _, n := range nodes {
		fmt.Printf("%d\n", n.IP)
	}

	sending := false

	for i := 0; i < numStreams; i++ {
		seed_i := sha256.Sum256(append(append([]byte{}, seed...), byte(i)))
		tc1, c1, err := torch.BuildCircuit(ctx, proxy.FromEnvironment(), nodes)
		if err != nil {
			return err
		}
		defer tc1.Close()
		tc2, c2, err := torch.BuildCircuit(ctx, proxy.FromEnvironment(), nodes)
		if err != nil {
			return err
		}
		defer tc2.Close()

		ndc, err := nd.Handshake(ctx, c1, c2, seed_i[:])
		// Arbitrarily choose one of the sides of the TOR connection to be the sender of the test data
		// By choosing the first ndc.bit
		if i == 0 {
			sending = ndc.Bit
		}
		if err != nil {
			return err
		}
		rr.AddConn(ndc)
	}

	println("connected and running")

	if sending {
		if err = clockstation.Run(ctx, rr, time.Tick(50*time.Millisecond)); err != nil {
			return fmt.Errorf("clockstation.Run: %s\n", err.Error())
		}
	} else {
		if err = clockprinter.Run(ctx, rr); err != nil {
			fmt.Errorf("clockprinter.Run: %s\n", err.Error())
		}
	}
	return nil

	<-ctx.Done()
	return nil
}