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// Package server implements the private API to implement a TURN server
package server
import (
"fmt"
"net"
"sync"
"time"
"github.com/pion/logging"
"github.com/pion/stun"
"github.com/pion/turn/v2/internal/allocation"
"github.com/pion/turn/v2/internal/proto"
)
// Request contains all the state needed to process a single incoming datagram
type Request struct {
// Current Request State
Conn net.PacketConn
SrcAddr net.Addr
Buff []byte
// Server State
AllocationManager *allocation.Manager
Nonces *sync.Map
// User Configuration
AuthHandler func(username string, realm string, srcAddr net.Addr) (key []byte, ok bool)
Log logging.LeveledLogger
Realm string
ChannelBindTimeout time.Duration
}
// HandleRequest processes the give Request
func HandleRequest(r Request) error {
r.Log.Debugf("received %d bytes of udp from %s on %s", len(r.Buff), r.SrcAddr.String(), r.Conn.LocalAddr().String())
if proto.IsChannelData(r.Buff) {
return handleDataPacket(r)
}
return handleTURNPacket(r)
}
func handleDataPacket(r Request) error {
r.Log.Debugf("received DataPacket from %s", r.SrcAddr.String())
c := proto.ChannelData{Raw: r.Buff}
if err := c.Decode(); err != nil {
return fmt.Errorf("%w: %v", errFailedToCreateChannelData, err)
}
err := handleChannelData(r, &c)
if err != nil {
err = fmt.Errorf("%w from %v: %v", errUnableToHandleChannelData, r.SrcAddr, err)
}
return err
}
func handleTURNPacket(r Request) error {
r.Log.Debug("handleTURNPacket")
m := &stun.Message{Raw: append([]byte{}, r.Buff...)}
if err := m.Decode(); err != nil {
return fmt.Errorf("%w: %v", errFailedToCreateSTUNPacket, err)
}
h, err := getMessageHandler(m.Type.Class, m.Type.Method)
if err != nil {
return fmt.Errorf("%w %v-%v from %v: %v", errUnhandledSTUNPacket, m.Type.Method, m.Type.Class, r.SrcAddr, err)
}
err = h(r, m)
if err != nil {
return fmt.Errorf("%w %v-%v from %v: %v", errFailedToHandle, m.Type.Method, m.Type.Class, r.SrcAddr, err)
}
return nil
}
func getMessageHandler(class stun.MessageClass, method stun.Method) (func(r Request, m *stun.Message) error, error) {
switch class {
case stun.ClassIndication:
switch method {
case stun.MethodSend:
return handleSendIndication, nil
default:
return nil, fmt.Errorf("%w: %s", errUnexpectedMethod, method)
}
case stun.ClassRequest:
switch method {
case stun.MethodAllocate:
return handleAllocateRequest, nil
case stun.MethodRefresh:
return handleRefreshRequest, nil
case stun.MethodCreatePermission:
return handleCreatePermissionRequest, nil
case stun.MethodChannelBind:
return handleChannelBindRequest, nil
case stun.MethodBinding:
return handleBindingRequest, nil
default:
return nil, fmt.Errorf("%w: %s", errUnexpectedMethod, method)
}
default:
return nil, fmt.Errorf("%w: %s", errUnexpectedClass, class)
}
}
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