save working solution

network/default.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"fmt"
 	"hash/fnv"
+	"io"
 	"math"
 	"sync"
 	"time"
@@ -70,6 +71,9 @@ type network struct {
 	connected bool
 	// closed closes the network
 	closed chan bool
+	// whether we've announced the first connect successfully
+	// and received back some sort of peer message
+	announced chan bool
 }
 
 // newNetwork returns a new network node
@@ -267,10 +271,11 @@ func (n *network) handleNetConn(s tunnel.Session, msg chan *message) {
 		m := new(transport.Message)
 		if err := s.Recv(m); err != nil {
 			log.Debugf("Network tunnel [%s] receive error: %v", NetworkChannel, err)
-			if sessionErr := s.Close(); sessionErr != nil {
-				log.Debugf("Network tunnel [%s] closing connection error: %v", NetworkChannel, sessionErr)
+			if err == io.EOF {
+				s.Close()
+				return
 			}
-			return
+			continue
 		}
 
 		select {
@@ -452,6 +457,14 @@ func (n *network) processNetChan(listener tunnel.Listener) {
 				if err := n.node.UpdatePeer(peer); err != nil {
 					log.Debugf("Network failed to update peers: %v", err)
 				}
+
+				// check if we announced and were discovered
+				select {
+				case <-n.announced:
+					// we've sent the connect and received this response
+				default:
+					close(n.announced)
+				}
 			case "close":
 				pbNetClose := &pbNet.Close{}
 				if err := proto.Unmarshal(m.msg.Body, pbNetClose); err != nil {
@@ -622,10 +635,11 @@ func (n *network) handleCtrlConn(s tunnel.Session, msg chan *message) {
 		m := new(transport.Message)
 		if err := s.Recv(m); err != nil {
 			log.Debugf("Network tunnel [%s] receive error: %v", ControlChannel, err)
-			if sessionErr := s.Close(); sessionErr != nil {
-				log.Debugf("Network tunnel [%s] closing connection error: %v", ControlChannel, sessionErr)
+			if err == io.EOF {
+				s.Close()
+				return
 			}
-			return
+			continue
 		}
 
 		select {
@@ -930,6 +944,40 @@ func (n *network) sendConnect() {
 	}
 }
 
+// connect will wait for a link to be established
+func (n *network) connect() {
+	// wait for connected state
+	var connected bool
+
+	for {
+		// check the links
+		for _, link := range n.tunnel.Links() {
+			if link.State() == "connected" {
+				connected = true
+				break
+			}
+		}
+
+		// if we're not conencted wait
+		if !connected {
+			time.Sleep(time.Second)
+			continue
+		}
+
+		// send the connect message
+		n.sendConnect()
+
+		// check the announce channel
+		select {
+		case <-n.announced:
+			return
+		default:
+			time.Sleep(time.Second)
+			// we have to go again
+		}
+	}
+}
+
 // Connect connects the network
 func (n *network) Connect() error {
 	n.Lock()
@@ -1000,6 +1048,8 @@ func (n *network) Connect() error {
 
 	// create closed channel
 	n.closed = make(chan bool)
+	// create new announced channel
+	n.announced = make(chan bool)
 
 	// start the router
 	if err := n.options.Router.Start(); err != nil {
@@ -1022,25 +1072,7 @@ func (n *network) Connect() error {
 	n.Unlock()
 
 	// send connect after there's a link established
-	go func() {
-		// wait for 30 ticks e.g 30 seconds
-		for i := 0; i < 30; i++ {
-			// get the current links
-			links := n.tunnel.Links()
-
-			// if there are no links wait until we have one
-			if len(links) == 0 {
-				time.Sleep(time.Second)
-				continue
-			}
-
-			// send the connect message
-			n.sendConnect()
-			// most importantly
-			break
-		}
-	}()
-
+	go n.connect()
 	// go resolving network nodes
 	go n.resolve()
 	// broadcast peers

tunnel/default.go

@@ -629,7 +629,7 @@ func (t *tun) listen(link *link) {
 			s, exists = t.getSession(channel, "listener")
 		// only return accept to the session
 		case mtype == "accept":
-			log.Debugf("Received accept message for %s %s", channel, sessionId)
+			log.Debugf("Received accept message for channel: %s session: %s", channel, sessionId)
 			s, exists = t.getSession(channel, sessionId)
 			if exists && s.accepted {
 				continue
@@ -649,7 +649,7 @@ func (t *tun) listen(link *link) {
 
 		// bail if no session or listener has been found
 		if !exists {
-			log.Debugf("Tunnel skipping no session %s %s exists", channel, sessionId)
+			log.Debugf("Tunnel skipping no channel: %s session: %s exists", channel, sessionId)
 			// drop it, we don't care about
 			// messages we don't know about
 			continue
@@ -665,7 +665,7 @@ func (t *tun) listen(link *link) {
 			// otherwise process
 		}
 
-		log.Debugf("Tunnel using channel %s session %s type %s", s.channel, s.session, mtype)
+		log.Debugf("Tunnel using channel: %s session: %s type: %s", s.channel, s.session, mtype)
 
 		// construct a new transport message
 		tmsg := &transport.Message{

tunnel/listener.go

@@ -71,7 +71,7 @@ func (t *tunListener) process() {
 			switch m.mode {
 			case Multicast, Broadcast:
 				// use channel name if multicast/broadcast
-				sessionId = m.channel
+				sessionId = "multicast"
 				log.Tracef("Tunnel listener using session %s for real session %s", sessionId, m.session)
 			default:
 				// use session id if unicast
@@ -198,6 +198,10 @@ func (t *tunListener) Accept() (Session, error) {
 		if !ok {
 			return nil, io.EOF
 		}
+		// return without accept
+		if c.mode != Unicast {
+			return c, nil
+		}
 		// send back the accept
 		if err := c.Accept(); err != nil {
 			return nil, err

tunnel/session.go

@@ -2,7 +2,6 @@ package tunnel
 
 import (
 	"encoding/hex"
-	"errors"
 	"io"
 	"time"
 
@@ -344,7 +343,7 @@ func (s *session) Recv(m *transport.Message) error {
 
 	select {
 	case <-s.closed:
-		return errors.New("session is closed")
+		return io.EOF
 	// recv from backlog
 	case msg = <-s.recv:
 	}
@@ -360,7 +359,10 @@ func (s *session) Recv(m *transport.Message) error {
 	log.Debugf("Received %+v from recv backlog", msg)
 
 	// decrypt the received payload using the token
-	body, err := Decrypt(msg.data.Body, s.token+s.channel+s.session)
+	// we have to used msg.session because multicast has a shared
+	// session id of "multicast" in this session struct on 
+	// the listener side
+	body, err := Decrypt(msg.data.Body, s.token+s.channel+msg.session)
 	if err != nil {
 		log.Debugf("failed to decrypt message body: %v", err)
 		return err
@@ -376,7 +378,7 @@ func (s *session) Recv(m *transport.Message) error {
 			return err
 		}
 		// encrypt the transport message payload
-		val, err := Decrypt([]byte(h), s.token+s.channel+s.session)
+		val, err := Decrypt([]byte(h), s.token+s.channel+msg.session)
 		if err != nil {
 			log.Debugf("failed to decrypt message header %s: %v", k, err)
 			return err