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
}
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
}