// client and transport handler for connections.
func (s *Server) clientHandler(conn net.Conn) {
defer conn.Close()
c := &client{
conn: conn,
enc: gob.NewEncoder(conn),
dec: gob.NewDecoder(conn),
}
// get the first client struct as a handshake
var handshake Message
if err := c.dec.Decode(&handshake); err != nil {
// client disconnected before it sent the full handshake
if err != io.EOF {
log.Errorln(err)
}
return
}
c.Client = handshake.Client
log.Debug("new client: %v", handshake.Client)
if c.Version != version.Revision {
log.Warn("mismatched miniccc version: %v", c.Version)
}
// Set up minitunnel, dialing the server that should be running on the
// client's side. Data is Trunk'd via Messages.
local, remote := net.Pipe()
defer local.Close()
defer remote.Close()
go func() {
go Trunk(remote, c.UUID, c.sendMessage)
tunnel, err := minitunnel.Dial(local)
if err != nil {
log.Error("dial: %v", err)
return
}
s.clientLock.Lock()
defer s.clientLock.Unlock()
log.Debug("minitunnel created for %v", c.UUID)
c.tunnel = tunnel
}()
c.Checkin = time.Now()
if err := s.addClient(c); err != nil {
log.Errorln(err)
return
}
defer s.removeClient(c.UUID)
var err error
for err == nil {
var m Message
if err = c.dec.Decode(&m); err == nil {
log.Debug("new message: %v", m.Type)
switch m.Type {
case MESSAGE_TUNNEL:
_, err = remote.Write(m.Tunnel)
case MESSAGE_FILE:
m2 := s.readFile(m.Filename)
m2.UUID = m.UUID
err = c.sendMessage(m2)
case MESSAGE_CLIENT:
s.responses <- m.Client
case MESSAGE_COMMAND:
// this shouldn't be sent via the client...
default:
err = fmt.Errorf("unknown message type: %v", m.Type)
}
}
}
if err != io.EOF && !strings.Contains(err.Error(), "connection reset by peer") {
log.Errorln(err)
}
}
// tunnel transport handler
func (c *Client) handleTunnel(server bool, stop chan bool) {
log.Debug("handleTunnel: %v", server)
a, b := net.Pipe()
c.tunnelData = make(chan []byte, 1024)
go func() {
if server {
var err error
c.tunnel, err = minitunnel.Dial(a)
if err != nil {
log.Errorln("Dial: %v", err)
a.Close()
b.Close()
}
} else {
go func() {
err := minitunnel.ListenAndServe(a)
if err != nil {
log.Fatalln("ListenAndServe: %v", err)
}
}()
}
}()
go func() {
for {
var buf = make([]byte, BUFFER_SIZE)
n, err := b.Read(buf)
if err != nil {
if err != io.ErrClosedPipe {
log.Errorln(err)
}
a.Close()
b.Close()
return
}
// push it up in a message
m := &Message{
Type: MESSAGE_TUNNEL,
UUID: c.UUID,
Tunnel: buf[:n],
}
c.out <- m
}
}()
go func() {
for {
data := <-c.tunnelData
if data == nil {
return
}
_, err := b.Write(data)
if err != nil {
log.Errorln(err)
a.Close()
b.Close()
return
}
}
}()
<-stop
log.Debug("ron client tunnel close: %v", c.UUID)
a.Close()
b.Close()
close(c.tunnelData)
}