/
transport.go
96 lines (80 loc) · 1.58 KB
/
transport.go
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package stun
import (
"encoding/binary"
"errors"
"net"
)
type Listener interface {
Addr() net.Addr
Close() error
}
type Transport interface {
LocalAddr() net.Addr
RemoteAddr() net.Addr
Write(p []byte) (int, error)
Close() error
}
type Marshaler interface {
Marshal(b []byte) []byte
}
type TransportHandler interface {
ServeTransport(b []byte, tr Transport) (int, error)
}
func dialUDP(network, raddr string) (net.Conn, error) {
addr, err := net.ResolveUDPAddr(network, raddr)
if err != nil {
return nil, err
}
conn, err := net.ListenUDP(network, nil)
if err != nil {
return nil, err
}
return &packetConn{conn, addr}, nil
}
func dialTCP(network, raddr string) (net.Conn, error) {
addr, err := net.ResolveTCPAddr(network, raddr)
if err != nil {
return nil, err
}
return net.DialTCP(network, nil, addr)
}
type packetConn struct {
net.PacketConn
addr net.Addr
}
func (t *packetConn) Read(p []byte) (n int, err error) {
n, _, err = t.ReadFrom(p)
return
}
func (t *packetConn) Write(p []byte) (int, error) {
return t.WriteTo(p, t.addr)
}
func (t *packetConn) RemoteAddr() net.Addr {
return t.addr
}
var (
errBufferOverflow = errors.New("stun: buffer overflow")
errFormat = errors.New("stun: format error")
)
func getBuffer() []byte {
return make([]byte, 2048)
}
func putBuffer(b []byte) {
if cap(b) >= 2048 {
}
}
func grow(p []byte, n int) (b, a []byte) {
l := len(p)
r := l + n
if r > cap(p) {
b = make([]byte, (1+((r-1)>>10))<<10)[:r]
a = b[l:r]
if l > 0 {
copy(b, p[:l])
}
} else {
return p[:r], p[l:r]
}
return
}
var be = binary.BigEndian