Ejemplo n.º 1
0
func (mng *Manager) putTx(tx Transaction) {
	viaHeaders := tx.Origin().Headers("Via")
	if len(viaHeaders) == 0 {
		log.Warn("No Via header on new transaction. Transaction will be dropped.")
		return
	}

	via, ok := viaHeaders[0].(*base.ViaHeader)
	if !ok {
		// TODO: Handle this better.
		panic(errors.New("Headers('Via') returned non-Via header!"))
	}

	branch, ok := (*via)[0].Params.Get("branch")
	if !ok {
		log.Warn("No branch parameter on top Via header.  Transaction will be dropped.")
		return
	}

	var k key
	switch branch := branch.(type) {
	case base.String:
		k = key{branch.String(), string(tx.Origin().Method)}
	case base.NoString:
		log.Warn("Empty branch parameter on top Via header. Transaction will be dropped.")
		return
	default:
		log.Warn("Unexpected type of branch value on top Via header: %T", branch)
		return
	}
	mng.txLock.Lock()
	mng.txs[k] = tx
	mng.txLock.Unlock()
}
Ejemplo n.º 2
0
// Management loop for the connTable.
// Handles notifications of connection updates, expiries of connections, and
// the termination of the routine.
func (t *connTable) manage() {
	for {
		select {
		case request := <-t.connRequests:
			watcher := t.conns[request.addr]
			if watcher != nil {
				request.responseChan <- watcher.conn
			} else {
				request.responseChan <- nil
			}
		case update := <-t.updates:
			t.handleUpdate(update)
		case addr := <-t.expiries:
			if t.conns[addr].expiryTime.Before(time.Now()) {
				log.Debug("Conntable %p notified that the watcher for address %s has expired. Remove it.", t, addr)
				t.conns[addr].stop <- true
				t.conns[addr].conn.Close()
				delete(t.conns, addr)
			} else {
				// Due to a race condition, the socket has been updated since this expiry happened.
				// Ignore the expiry since we already have a new socket for this address.
				log.Warn("Ignored spurious expiry for address %s in conntable %p", t, addr)
			}
		case <-t.stop:
			log.Info("Conntable %p stopped")
			t.stopped = true
			for _, watcher := range t.conns {
				watcher.stop <- true
				watcher.conn.Close()
			}
			break
		}
	}
}
Ejemplo n.º 3
0
// Create Client transaction.
func (mng *Manager) Send(r *base.Request, dest string) *ClientTransaction {
	log.Debug("Sending to %v: %v", dest, r.String())

	tx := &ClientTransaction{}
	tx.origin = r
	tx.dest = dest
	tx.transport = mng.transport
	tx.tm = mng

	tx.initFSM()

	tx.tu = make(chan *base.Response, 3)
	tx.tu_err = make(chan error, 1)

	tx.timer_a_time = T1
	tx.timer_a = time.AfterFunc(tx.timer_a_time, func() {
		tx.fsm.Spin(client_input_timer_a)
	})
	tx.timer_b = time.AfterFunc(64*T1, func() {
		tx.fsm.Spin(client_input_timer_b)
	})

	// Timer D is set to 32 seconds for unreliable transports, and 0 seconds otherwise.
	tx.timer_d_time = 32 * time.Second

	err := mng.transport.Send(dest, r)
	if err != nil {
		log.Warn("Failed to send message: %s", err.Error())
		tx.fsm.Spin(client_input_transport_err)
	}

	mng.putTx(tx)

	return tx
}
Ejemplo n.º 4
0
func (connection *connection) pipeOutput() {
	for {
		select {
		case message, ok := <-connection.parsedMessages:
			if ok {
				log.Debug("Connection %p from %s to %s received message over the wire: %s",
					connection,
					connection.baseConn.RemoteAddr(),
					connection.baseConn.LocalAddr(),
					message.Short())
				connection.output <- message
			} else {
				break
			}
		case err, ok := <-connection.parserErrors:
			if ok {
				// The parser has hit a terminal error. We need to restart it.
				log.Warn("Failed to parse SIP message: %s", err.Error())
				connection.parser = parser.NewParser(connection.parsedMessages,
					connection.parserErrors, connection.isStreamed)
			} else {
				break
			}
		}
	}

	log.Info("Parser stopped in ConnWrapper %v (local addr %s; remote addr %s); stopping listening",
		connection, connection.baseConn.LocalAddr(), connection.baseConn.RemoteAddr())
}
Ejemplo n.º 5
0
func (caller *endpoint) Invite(callee *endpoint) error {
	// Starting a dialog.
	callid := "thisisacall" + string(caller.dialogIx)
	tagString := fmt.Sprintf("tag.%s.%s", caller.username, caller.host)
	branch := "z9hG4bK.callbranch.INVITE"
	caller.dialog.callId = callid
	caller.dialog.from_tag = base.String{tagString}
	caller.dialog.currentTx = txInfo{}
	caller.dialog.currentTx.branch = branch

	invite := base.NewRequest(
		base.INVITE,
		&base.SipUri{
			User: &callee.username,
			Host: callee.host,
		},
		"SIP/2.0",
		[]base.SipHeader{
			Via(caller, branch),
			To(callee, caller.dialog.to_tag),
			From(caller, caller.dialog.from_tag),
			Contact(caller),
			CSeq(caller.dialog.cseq, base.INVITE),
			CallId(callid),
			ContentLength(0),
		},
		"",
	)
	caller.dialog.cseq += 1

	log.Info("Sending: %v", invite.Short())
	tx := caller.tm.Send(invite, fmt.Sprintf("%v:%v", callee.host, callee.port))
	caller.dialog.currentTx.tx = transaction.Transaction(tx)
	for {
		select {
		case r := <-tx.Responses():
			log.Info("Received response: %v", r.Short())
			log.Debug("Full form:\n%v\n", r.String())
			// Get To tag if present.
			tag, ok := r.Headers("To")[0].(*base.ToHeader).Params.Get("tag")
			if ok {
				caller.dialog.to_tag = tag.(base.String)
			}

			switch {
			case r.StatusCode >= 300:
				// Call setup failed.
				return fmt.Errorf("callee sent negative response code %v.", r.StatusCode)
			case r.StatusCode >= 200:
				// Ack 200s manually.
				log.Info("Sending Ack")
				tx.Ack()
				return nil
			}
		case e := <-tx.Errors():
			log.Warn(e.Error())
			return e
		}
	}
}
Ejemplo n.º 6
0
func (udp *Udp) listen(conn *net.UDPConn) {
	log.Info("Begin listening for UDP on address %s", conn.LocalAddr())

	buffer := make([]byte, c_BUFSIZE)
	for {
		num, _, err := conn.ReadFromUDP(buffer)
		if err != nil {
			if udp.stop {
				log.Info("Stopped listening for UDP on %s", conn.LocalAddr)
				break
			} else {
				log.Severe("Failed to read from UDP buffer: " + err.Error())
				continue
			}
		}

		pkt := append([]byte(nil), buffer[:num]...)
		go func() {
			msg, err := parser.ParseMessage(pkt)
			if err != nil {
				log.Warn("Failed to parse SIP message: %s", err.Error())
			} else {
				udp.output <- msg
			}
		}()
	}
}
Ejemplo n.º 7
0
// Give a received response to the correct transaction.
func (mng *Manager) correlate(r *base.Response) {
	tx, ok := mng.getTx(r)
	if !ok {
		// TODO: Something
		log.Warn("Failed to correlate response to active transaction. Dropping it.")
		return
	}

	tx.Receive(r)
}
Ejemplo n.º 8
0
func (tx *ServerTransaction) Receive(m base.SipMessage) {
	r, ok := m.(*base.Request)
	if !ok {
		log.Warn("Client transaction received request")
	}

	var input fsm.Input = fsm.NO_INPUT
	switch {
	case r.Method == tx.origin.Method:
		input = server_input_request
	case r.Method == base.ACK:
		input = server_input_ack
		tx.ack <- r
	default:
		log.Warn("Invalid message correlated to server transaction.")
	}

	tx.fsm.Spin(input)
}
Ejemplo n.º 9
0
// Gets a transaction from the transaction store.
// Should only be called inside the storage handling goroutine to ensure concurrency safety.
func (mng *Manager) getTx(s base.SipMessage) (Transaction, bool) {
	key, ok := mng.makeKey(s)
	if !ok {
		// TODO: Here we should initiate more intense searching as specified in RFC3261 section 17
		log.Warn("Could not correlate message to transaction by branch/method. Dropping.")
		return nil, false
	}

	mng.txLock.RLock()
	tx, ok := mng.txs[key]
	mng.txLock.RUnlock()

	return tx, ok
}
Ejemplo n.º 10
0
func main() {
	log.SetDefaultLogLevel(log.DEBUG)
	err := caller.Start()
	if err != nil {
		log.Warn("Failed to start caller: %v", err)
		return
	}

	// Receive an incoming call.
	caller.ServeInvite()

	<-time.After(2 * time.Second)

	// Send the BYE
	caller.Bye(callee)
}
Ejemplo n.º 11
0
func (caller *endpoint) nonInvite(callee *endpoint, method base.Method) error {
	caller.dialog.currentTx.branch = "z9hG4bK.callbranch." + string(method)
	request := base.NewRequest(
		method,
		&base.SipUri{
			User: &callee.username,
			Host: callee.host,
		},
		"SIP/2.0",
		[]base.SipHeader{
			Via(caller, caller.dialog.currentTx.branch),
			To(callee, caller.dialog.to_tag),
			From(caller, caller.dialog.from_tag),
			Contact(caller),
			CSeq(caller.dialog.cseq, method),
			CallId(caller.dialog.callId),
			ContentLength(0),
		},
		"",
	)
	caller.dialog.cseq += 1

	log.Info("Sending: %v", request.Short())
	tx := caller.tm.Send(request, fmt.Sprintf("%v:%v", callee.host, callee.port))
	caller.dialog.currentTx.tx = transaction.Transaction(tx)
	for {
		select {
		case r := <-tx.Responses():
			log.Info("Received response: %v", r.Short())
			log.Debug("Full form:\n%v\n", r.String())
			switch {
			case r.StatusCode >= 300:
				// Failure (or redirect).
				return fmt.Errorf("callee sent negative response code %v.", r.StatusCode)
			case r.StatusCode >= 200:
				// Success.
				log.Info("Successful transaction")
				return nil
			}
		case e := <-tx.Errors():
			log.Warn(e.Error())
			return e
		}
	}
}
Ejemplo n.º 12
0
func (tx *ClientTransaction) Receive(m base.SipMessage) {
	r, ok := m.(*base.Response)
	if !ok {
		log.Warn("Client transaction received request")
	}

	tx.lastResp = r

	var input fsm.Input
	switch {
	case r.StatusCode < 200:
		input = client_input_1xx
	case r.StatusCode < 300:
		input = client_input_2xx
	default:
		input = client_input_300_plus
	}

	tx.fsm.Spin(input)
}
Ejemplo n.º 13
0
// Handle a request.
func (mng *Manager) request(r *base.Request) {
	t, ok := mng.getTx(r)
	if ok {
		t.Receive(r)
		return
	}

	// If we failed to correlate an ACK, just drop it.
	if r.Method == base.ACK {
		log.Warn("Couldn't correlate ACK to an open transaction. Dropping it.")
		return
	}

	// Create a new transaction
	tx := &ServerTransaction{}
	tx.tm = mng
	tx.origin = r
	tx.transport = mng.transport

	// Use the remote address in the top Via header.  This is not correct behaviour.
	viaHeaders := tx.Origin().Headers("Via")
	if len(viaHeaders) == 0 {
		log.Warn("No Via header on new transaction. Transaction will be dropped.")
		return
	}

	via, ok := viaHeaders[0].(*base.ViaHeader)
	if !ok {
		panic(errors.New("Headers('Via') returned non-Via header!"))
	}

	if len(*via) == 0 {
		log.Warn("Via header contained no hops! Transaction will be dropped.")
		return
	}

	hop := (*via)[0]

	port := uint16(5060)

	if hop.Port != nil {
		port = *hop.Port
	}

	tx.dest = fmt.Sprintf("%s:%d", hop.Host, port)
	tx.transport = mng.transport

	tx.initFSM()

	tx.tu = make(chan *base.Response, 3)
	tx.tu_err = make(chan error, 1)
	tx.ack = make(chan *base.Request, 1)

	// Send a 100 Trying immediately.
	// Technically we shouldn't do this if we trustthe user to do it within 200ms,
	// but I'm not sure how to handle that situation right now.

	// Pretend the user sent us a 100 to send.
	trying := base.NewResponse(
		"SIP/2.0",
		100,
		"Trying",
		[]base.SipHeader{},
		"",
	)

	base.CopyHeaders("Via", tx.origin, trying)
	base.CopyHeaders("From", tx.origin, trying)
	base.CopyHeaders("To", tx.origin, trying)
	base.CopyHeaders("Call-Id", tx.origin, trying)
	base.CopyHeaders("CSeq", tx.origin, trying)

	tx.lastResp = trying
	tx.fsm.Spin(server_input_user_1xx)

	mng.requests <- tx
}
Ejemplo n.º 14
0
func (tx *ClientTransaction) Delete() {
	log.Warn("Tx: %p, tm: %p", tx, tx.tm)
	tx.tm.delTx(tx)
}