2019-08-05 19:41:48 +01:00
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package tunnel
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import (
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2019-08-07 18:44:33 +01:00
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"crypto/sha256"
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"errors"
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"fmt"
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2019-08-05 19:41:48 +01:00
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"sync"
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2019-08-07 18:44:33 +01:00
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"github.com/google/uuid"
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2019-08-05 19:41:48 +01:00
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"github.com/micro/go-micro/transport"
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2019-08-07 18:44:33 +01:00
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"github.com/micro/go-micro/util/log"
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2019-08-05 19:41:48 +01:00
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)
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2019-08-07 18:44:33 +01:00
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// tun represents a network tunnel
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type tun struct {
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2019-08-07 18:44:33 +01:00
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options Options
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2019-08-05 19:41:48 +01:00
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sync.RWMutex
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2019-08-07 18:44:33 +01:00
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2019-08-13 20:11:23 +01:00
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// tunnel token
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token string
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2019-08-07 18:44:33 +01:00
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// to indicate if we're connected or not
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connected bool
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// the send channel for all messages
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send chan *message
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// close channel
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closed chan bool
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// a map of sockets based on Micro-Tunnel-Id
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sockets map[string]*socket
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// outbound links
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links map[string]*link
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// listener
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listener transport.Listener
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2019-08-05 19:41:48 +01:00
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}
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type link struct {
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transport.Socket
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id string
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loopback bool
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}
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2019-08-07 18:44:33 +01:00
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// create new tunnel on top of a link
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func newTunnel(opts ...Option) *tun {
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options := DefaultOptions()
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2019-08-05 19:41:48 +01:00
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for _, o := range opts {
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o(&options)
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}
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2019-08-07 18:44:33 +01:00
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return &tun{
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options: options,
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token: uuid.New().String(),
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send: make(chan *message, 128),
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closed: make(chan bool),
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2019-08-07 18:44:33 +01:00
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sockets: make(map[string]*socket),
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links: make(map[string]*link),
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}
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2019-08-07 18:44:33 +01:00
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}
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2019-08-05 19:41:48 +01:00
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2019-08-14 13:26:23 +01:00
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// Init initializes tunnel options
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func (t *tun) Init(opts ...Option) error {
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for _, o := range opts {
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o(&t.options)
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}
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return nil
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}
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2019-08-07 18:44:33 +01:00
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// getSocket returns a socket from the internal socket map.
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// It does this based on the Micro-Tunnel-Id and Micro-Tunnel-Session
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func (t *tun) getSocket(id, session string) (*socket, bool) {
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// get the socket
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t.RLock()
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s, ok := t.sockets[id+session]
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t.RUnlock()
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return s, ok
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2019-08-05 19:41:48 +01:00
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}
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2019-08-07 18:44:33 +01:00
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// newSocket creates a new socket and saves it
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func (t *tun) newSocket(id, session string) (*socket, bool) {
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// hash the id
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h := sha256.New()
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h.Write([]byte(id))
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id = fmt.Sprintf("%x", h.Sum(nil))
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// new socket
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s := &socket{
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id: id,
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session: session,
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closed: make(chan bool),
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recv: make(chan *message, 128),
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send: t.send,
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wait: make(chan bool),
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}
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// save socket
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t.Lock()
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_, ok := t.sockets[id+session]
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if ok {
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// socket already exists
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t.Unlock()
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return nil, false
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}
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2019-08-14 01:23:03 +01:00
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2019-08-07 18:44:33 +01:00
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t.sockets[id+session] = s
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t.Unlock()
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// return socket
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return s, true
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2019-08-05 19:41:48 +01:00
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}
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2019-08-07 18:44:33 +01:00
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// TODO: use tunnel id as part of the session
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func (t *tun) newSession() string {
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return uuid.New().String()
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2019-08-06 11:45:25 +01:00
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}
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2019-08-07 18:44:33 +01:00
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// process outgoing messages sent by all local sockets
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func (t *tun) process() {
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// manage the send buffer
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// all pseudo sockets throw everything down this
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for {
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select {
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case msg := <-t.send:
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2019-08-10 16:37:49 +01:00
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newMsg := &transport.Message{
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Header: make(map[string]string),
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2019-08-07 18:44:33 +01:00
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Body: msg.data.Body,
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}
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2019-08-10 16:37:49 +01:00
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for k, v := range msg.data.Header {
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newMsg.Header[k] = v
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2019-08-08 12:45:37 +01:00
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}
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2019-08-07 18:44:33 +01:00
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// set the tunnel id on the outgoing message
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2019-08-10 16:37:49 +01:00
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newMsg.Header["Micro-Tunnel-Id"] = msg.id
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2019-08-07 18:44:33 +01:00
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// set the session id
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2019-08-10 16:37:49 +01:00
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newMsg.Header["Micro-Tunnel-Session"] = msg.session
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2019-08-07 18:44:33 +01:00
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2019-08-14 13:00:10 +01:00
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// set the tunnel token
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newMsg.Header["Micro-Tunnel-Token"] = t.token
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2019-08-07 18:44:33 +01:00
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// send the message via the interface
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t.RLock()
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2019-08-11 18:11:33 +01:00
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if len(t.links) == 0 {
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log.Debugf("Zero links to send to")
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}
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2019-08-07 18:44:33 +01:00
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for _, link := range t.links {
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2019-08-11 21:53:40 +01:00
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// TODO: error check and reconnect
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2019-08-14 17:14:39 +01:00
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log.Debugf("Sending %+v to %s", newMsg, link.Remote())
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if link.loopback && msg.outbound {
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continue
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}
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2019-08-10 16:37:49 +01:00
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link.Send(newMsg)
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2019-08-07 18:44:33 +01:00
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}
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t.RUnlock()
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case <-t.closed:
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return
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}
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}
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2019-08-05 19:41:48 +01:00
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}
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2019-08-07 18:44:33 +01:00
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// process incoming messages
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2019-08-14 17:14:39 +01:00
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func (t *tun) listen(link *link) {
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2019-08-14 13:00:10 +01:00
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// loopback flag
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var loopback bool
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2019-08-07 18:44:33 +01:00
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for {
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// process anything via the net interface
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msg := new(transport.Message)
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err := link.Recv(msg)
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if err != nil {
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2019-08-11 18:11:33 +01:00
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log.Debugf("Tunnel link %s receive error: %v", link.Remote(), err)
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2019-08-07 18:44:33 +01:00
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return
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}
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2019-08-14 13:00:10 +01:00
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switch msg.Header["Micro-Tunnel"] {
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case "connect":
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// check the Micro-Tunnel-Token
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token, ok := msg.Header["Micro-Tunnel-Token"]
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if !ok {
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continue
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}
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2019-08-14 01:23:03 +01:00
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2019-08-13 20:11:23 +01:00
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// are we connecting to ourselves?
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if token == t.token {
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loopback = true
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2019-08-14 17:14:39 +01:00
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link.loopback = true
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2019-08-13 20:11:23 +01:00
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}
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2019-08-14 13:00:10 +01:00
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continue
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2019-08-13 20:11:23 +01:00
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case "close":
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// TODO: handle the close message
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// maybe report io.EOF or kill the link
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2019-08-07 18:44:33 +01:00
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continue
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}
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// the tunnel id
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id := msg.Header["Micro-Tunnel-Id"]
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2019-08-11 21:53:40 +01:00
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delete(msg.Header, "Micro-Tunnel-Id")
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2019-08-07 18:44:33 +01:00
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// the session id
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session := msg.Header["Micro-Tunnel-Session"]
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2019-08-11 21:53:40 +01:00
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delete(msg.Header, "Micro-Tunnel-Session")
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2019-08-07 18:44:33 +01:00
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// if the session id is blank there's nothing we can do
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// TODO: check this is the case, is there any reason
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// why we'd have a blank session? Is the tunnel
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// used for some other purpose?
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if len(id) == 0 || len(session) == 0 {
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continue
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}
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var s *socket
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var exists bool
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2019-08-10 16:37:49 +01:00
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log.Debugf("Received %+v from %s", msg, link.Remote())
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2019-08-13 20:11:23 +01:00
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switch {
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case loopback:
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2019-08-07 18:44:33 +01:00
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s, exists = t.getSocket(id, "listener")
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2019-08-13 20:11:23 +01:00
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default:
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// get the socket based on the tunnel id and session
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// this could be something we dialed in which case
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// we have a session for it otherwise its a listener
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s, exists = t.getSocket(id, session)
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2019-08-14 01:23:03 +01:00
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if !exists {
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// try get it based on just the tunnel id
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// the assumption here is that a listener
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// has no session but its set a listener session
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s, exists = t.getSocket(id, "listener")
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}
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2019-08-07 18:44:33 +01:00
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}
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2019-08-13 20:11:23 +01:00
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// bail if no socket has been found
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2019-08-07 18:44:33 +01:00
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if !exists {
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2019-08-11 18:11:33 +01:00
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log.Debugf("Tunnel skipping no socket exists")
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2019-08-07 18:44:33 +01:00
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// drop it, we don't care about
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// messages we don't know about
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continue
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}
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2019-08-11 18:11:33 +01:00
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log.Debugf("Tunnel using socket %s %s", s.id, s.session)
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2019-08-07 18:44:33 +01:00
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// is the socket closed?
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select {
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case <-s.closed:
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// closed
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delete(t.sockets, id)
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continue
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default:
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// process
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}
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// is the socket new?
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select {
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// if its new the socket is actually blocked waiting
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// for a connection. so we check if its waiting.
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case <-s.wait:
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// if its waiting e.g its new then we close it
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default:
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// set remote address of the socket
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s.remote = msg.Header["Remote"]
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close(s.wait)
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}
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// construct a new transport message
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tmsg := &transport.Message{
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Header: msg.Header,
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Body: msg.Body,
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}
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// construct the internal message
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imsg := &message{
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id: id,
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session: session,
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data: tmsg,
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}
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// append to recv backlog
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// we don't block if we can't pass it on
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select {
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case s.recv <- imsg:
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default:
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}
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}
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2019-08-05 19:41:48 +01:00
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}
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2019-08-14 13:26:23 +01:00
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// connect the tunnel to all the nodes and listen for incoming tunnel connections
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2019-08-07 18:44:33 +01:00
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func (t *tun) connect() error {
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l, err := t.options.Transport.Listen(t.options.Address)
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if err != nil {
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return err
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}
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// save the listener
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t.listener = l
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go func() {
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// accept inbound connections
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err := l.Accept(func(sock transport.Socket) {
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2019-08-08 13:15:30 +01:00
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log.Debugf("Tunnel accepted connection from %s", sock.Remote())
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2019-08-07 18:44:33 +01:00
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// save the link
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id := uuid.New().String()
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t.Lock()
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2019-08-14 17:14:39 +01:00
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link := &link{
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2019-08-07 18:44:33 +01:00
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Socket: sock,
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id: id,
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}
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2019-08-14 17:14:39 +01:00
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t.links[id] = link
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2019-08-07 18:44:33 +01:00
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t.Unlock()
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// delete the link
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defer func() {
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2019-08-11 18:11:33 +01:00
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log.Debugf("Deleting connection from %s", sock.Remote())
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2019-08-07 18:44:33 +01:00
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t.Lock()
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delete(t.links, id)
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t.Unlock()
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}()
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// listen for inbound messages
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2019-08-14 17:14:39 +01:00
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t.listen(link)
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2019-08-07 18:44:33 +01:00
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})
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t.Lock()
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defer t.Unlock()
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// still connected but the tunnel died
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if err != nil && t.connected {
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log.Logf("Tunnel listener died: %v", err)
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}
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}()
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for _, node := range t.options.Nodes {
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2019-08-08 13:15:30 +01:00
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// skip zero length nodes
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if len(node) == 0 {
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continue
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}
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log.Debugf("Tunnel dialing %s", node)
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2019-08-11 21:53:40 +01:00
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// TODO: reconnection logic is required to keep the tunnel established
|
2019-08-07 18:44:33 +01:00
|
|
|
c, err := t.options.Transport.Dial(node)
|
|
|
|
if err != nil {
|
|
|
|
log.Debugf("Tunnel failed to connect to %s: %v", node, err)
|
|
|
|
continue
|
|
|
|
}
|
2019-08-08 13:15:30 +01:00
|
|
|
log.Debugf("Tunnel connected to %s", node)
|
2019-08-07 18:44:33 +01:00
|
|
|
|
2019-08-08 00:19:16 +01:00
|
|
|
if err := c.Send(&transport.Message{
|
2019-08-07 18:44:33 +01:00
|
|
|
Header: map[string]string{
|
2019-08-13 20:11:23 +01:00
|
|
|
"Micro-Tunnel": "connect",
|
|
|
|
"Micro-Tunnel-Token": t.token,
|
2019-08-07 18:44:33 +01:00
|
|
|
},
|
2019-08-08 00:19:16 +01:00
|
|
|
}); err != nil {
|
2019-08-07 18:44:33 +01:00
|
|
|
continue
|
|
|
|
}
|
|
|
|
|
|
|
|
// save the link
|
|
|
|
id := uuid.New().String()
|
2019-08-14 17:14:39 +01:00
|
|
|
link := &link{
|
2019-08-07 18:44:33 +01:00
|
|
|
Socket: c,
|
|
|
|
id: id,
|
|
|
|
}
|
2019-08-14 17:14:39 +01:00
|
|
|
t.links[id] = link
|
|
|
|
|
|
|
|
// process incoming messages
|
|
|
|
go t.listen(link)
|
2019-08-07 18:44:33 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
// process outbound messages to be sent
|
|
|
|
// process sends to all links
|
|
|
|
go t.process()
|
|
|
|
|
2019-08-05 19:41:48 +01:00
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
2019-08-14 13:26:23 +01:00
|
|
|
// Connect the tunnel
|
|
|
|
func (t *tun) Connect() error {
|
|
|
|
t.Lock()
|
|
|
|
defer t.Unlock()
|
|
|
|
|
|
|
|
// already connected
|
|
|
|
if t.connected {
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
// send the connect message
|
|
|
|
if err := t.connect(); err != nil {
|
|
|
|
return err
|
|
|
|
}
|
|
|
|
|
|
|
|
// set as connected
|
|
|
|
t.connected = true
|
|
|
|
// create new close channel
|
|
|
|
t.closed = make(chan bool)
|
|
|
|
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
2019-08-07 18:44:33 +01:00
|
|
|
func (t *tun) close() error {
|
|
|
|
// close all the links
|
|
|
|
for id, link := range t.links {
|
|
|
|
link.Send(&transport.Message{
|
|
|
|
Header: map[string]string{
|
2019-08-14 13:00:10 +01:00
|
|
|
"Micro-Tunnel": "close",
|
|
|
|
"Micro-Tunnel-Token": t.token,
|
2019-08-07 18:44:33 +01:00
|
|
|
},
|
|
|
|
})
|
|
|
|
link.Close()
|
|
|
|
delete(t.links, id)
|
|
|
|
}
|
|
|
|
|
|
|
|
// close the listener
|
|
|
|
return t.listener.Close()
|
2019-08-05 19:41:48 +01:00
|
|
|
}
|
|
|
|
|
2019-08-07 18:44:33 +01:00
|
|
|
// Close the tunnel
|
|
|
|
func (t *tun) Close() error {
|
|
|
|
t.Lock()
|
|
|
|
defer t.Unlock()
|
|
|
|
|
|
|
|
if !t.connected {
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
2019-08-05 19:41:48 +01:00
|
|
|
select {
|
|
|
|
case <-t.closed:
|
2019-08-07 18:44:33 +01:00
|
|
|
return nil
|
2019-08-05 19:41:48 +01:00
|
|
|
default:
|
2019-08-07 18:44:33 +01:00
|
|
|
// close all the sockets
|
|
|
|
for _, s := range t.sockets {
|
|
|
|
s.Close()
|
|
|
|
}
|
|
|
|
// close the connection
|
|
|
|
close(t.closed)
|
|
|
|
t.connected = false
|
|
|
|
|
|
|
|
// send a close message
|
|
|
|
// we don't close the link
|
|
|
|
// just the tunnel
|
|
|
|
return t.close()
|
2019-08-05 19:41:48 +01:00
|
|
|
}
|
2019-08-07 18:44:33 +01:00
|
|
|
|
|
|
|
return nil
|
2019-08-05 19:41:48 +01:00
|
|
|
}
|
|
|
|
|
2019-08-07 18:44:33 +01:00
|
|
|
// Dial an address
|
|
|
|
func (t *tun) Dial(addr string) (Conn, error) {
|
2019-08-10 16:37:49 +01:00
|
|
|
log.Debugf("Tunnel dialing %s", addr)
|
2019-08-07 18:44:33 +01:00
|
|
|
c, ok := t.newSocket(addr, t.newSession())
|
|
|
|
if !ok {
|
|
|
|
return nil, errors.New("error dialing " + addr)
|
|
|
|
}
|
|
|
|
// set remote
|
|
|
|
c.remote = addr
|
|
|
|
// set local
|
|
|
|
c.local = "local"
|
2019-08-14 17:14:39 +01:00
|
|
|
// outbound socket
|
|
|
|
c.outbound = true
|
2019-08-07 18:44:33 +01:00
|
|
|
|
|
|
|
return c, nil
|
|
|
|
}
|
|
|
|
|
|
|
|
// Accept a connection on the address
|
|
|
|
func (t *tun) Listen(addr string) (Listener, error) {
|
2019-08-10 16:37:49 +01:00
|
|
|
log.Debugf("Tunnel listening on %s", addr)
|
2019-08-07 18:44:33 +01:00
|
|
|
// create a new socket by hashing the address
|
|
|
|
c, ok := t.newSocket(addr, "listener")
|
|
|
|
if !ok {
|
|
|
|
return nil, errors.New("already listening on " + addr)
|
|
|
|
}
|
|
|
|
|
|
|
|
// set remote. it will be replaced by the first message received
|
|
|
|
c.remote = "remote"
|
|
|
|
// set local
|
|
|
|
c.local = addr
|
|
|
|
|
|
|
|
tl := &tunListener{
|
|
|
|
addr: addr,
|
|
|
|
// the accept channel
|
|
|
|
accept: make(chan *socket, 128),
|
|
|
|
// the channel to close
|
|
|
|
closed: make(chan bool),
|
2019-08-08 15:20:53 +01:00
|
|
|
// tunnel closed channel
|
|
|
|
tunClosed: t.closed,
|
2019-08-07 18:44:33 +01:00
|
|
|
// the connection
|
|
|
|
conn: c,
|
|
|
|
// the listener socket
|
|
|
|
socket: c,
|
|
|
|
}
|
|
|
|
|
|
|
|
// this kicks off the internal message processor
|
|
|
|
// for the listener so it can create pseudo sockets
|
|
|
|
// per session if they do not exist or pass messages
|
|
|
|
// to the existign sessions
|
|
|
|
go tl.process()
|
|
|
|
|
|
|
|
// return the listener
|
|
|
|
return tl, nil
|
2019-08-05 19:41:48 +01:00
|
|
|
}
|