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proxy: implement the UDP marshalling/unmarshalling

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Signed-off-by: David Scott <dave.scott@docker.com>
This commit is contained in:
David Scott 2016-04-21 16:52:31 +01:00
parent 3870705eaf
commit 03ea441933
1 changed files with 63 additions and 9 deletions
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72
alpine/packages/proxy/libproxy/udp_encapsulation.go
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@ -1,12 +1,11 @@
package libproxy
import (
//"encoding/binary"
"errors"
"bytes"
"encoding/binary"
"io"
"net"
//"strings"
"sync"
//"syscall"
"github.com/Sirupsen/logrus"
)
@ -52,7 +51,7 @@ func (u *udpEncapsulator) ReadFromUDP(b []byte) (int, *net.UDPAddr, error) {
if err != nil {
return 0, nil, err
}
return len(datagram.payload), &net.UDPAddr{IP: *datagram.IP, Port: datagram.Port, Zone: datagram.Zone}, nil
return len(datagram.payload), &net.UDPAddr{IP: *datagram.IP, Port: int(datagram.Port), Zone: datagram.Zone}, nil
}
func (u *udpEncapsulator) WriteToUDP(b []byte, addr *net.UDPAddr) (int, error) {
@ -62,7 +61,7 @@ func (u *udpEncapsulator) WriteToUDP(b []byte, addr *net.UDPAddr) (int, error) {
}
u.w.Lock()
defer u.w.Unlock()
datagram := &udpDatagram{payload: b, IP: &addr.IP, Port: addr.Port, Zone: addr.Zone}
datagram := &udpDatagram{payload: b, IP: &addr.IP, Port: uint16(addr.Port), Zone: addr.Zone}
return len(b), datagram.Marshal(conn)
}
@ -87,14 +86,69 @@ func NewUDPListener(listener net.Listener) udpListener {
type udpDatagram struct {
payload []byte
IP *net.IP
Port int
Port uint16
Zone string
}
func (u *udpDatagram) Marshal(conn net.Conn) error {
return errors.New("Marshal unimplemented")
var length uint16
length = uint16(len(*u.IP))
if err := binary.Write(conn, binary.LittleEndian, &length); err != nil {
return err
}
if err := binary.Write(conn, binary.LittleEndian, &u.IP); err != nil {
return err
}
if err := binary.Write(conn, binary.LittleEndian, &u.Port); err != nil {
return err
}
length = uint16(len(u.Zone))
if err := binary.Write(conn, binary.LittleEndian, &length); err != nil {
return err
}
if err := binary.Write(conn, binary.LittleEndian, &u.Zone); err != nil {
return nil
}
length = uint16(len(u.payload))
if err := binary.Write(conn, binary.LittleEndian, &length); err != nil {
return nil
}
payload := bytes.NewBuffer(u.payload)
_, err := io.Copy(conn, payload)
if err != nil {
return err
}
return nil
}
func (u *udpDatagram) Unmarshal(conn net.Conn) error {
return errors.New("Unmarshal unimplemented")
var length uint16
if err := binary.Read(conn, binary.LittleEndian, &length); err != nil {
return err
}
var IP net.IP
IP = make([]byte, length)
if err := binary.Read(conn, binary.LittleEndian, &IP); err != nil {
return err
}
u.IP = &IP
if err := binary.Read(conn, binary.LittleEndian, &u.Port); err != nil {
return err
}
if err := binary.Read(conn, binary.LittleEndian, &length); err != nil {
return err
}
Zone := make([]byte, length)
if err := binary.Read(conn, binary.LittleEndian, &Zone); err != nil {
return err
}
u.Zone = string(Zone)
if err := binary.Read(conn, binary.LittleEndian, &length); err != nil {
return err
}
u.payload = make([]byte, length)
if err := binary.Read(conn, binary.LittleEndian, &u.payload); err != nil {
return err
}
return nil
}