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package proto
import (
"strconv"
"github.com/pion/stun"
)
// Protocol is IANA assigned protocol number.
type Protocol byte
const (
// ProtoUDP is IANA assigned protocol number for UDP.
ProtoUDP Protocol = 17
)
func (p Protocol) String() string {
switch p {
case ProtoUDP:
return "UDP"
default:
return strconv.Itoa(int(p))
}
}
// RequestedTransport represents REQUESTED-TRANSPORT attribute.
//
// This attribute is used by the client to request a specific transport
// protocol for the allocated transport address. RFC 5766 only allows the use of
// codepoint 17 (User Datagram Protocol).
//
// RFC 5766 Section 14.7
type RequestedTransport struct {
Protocol Protocol
}
func (t RequestedTransport) String() string {
return "protocol: " + t.Protocol.String()
}
const requestedTransportSize = 4
// AddTo adds REQUESTED-TRANSPORT to message.
func (t RequestedTransport) AddTo(m *stun.Message) error {
v := make([]byte, requestedTransportSize)
v[0] = byte(t.Protocol)
// b[1:4] is RFFU = 0.
// The RFFU field MUST be set to zero on transmission and MUST be
// ignored on reception. It is reserved for future uses.
m.Add(stun.AttrRequestedTransport, v)
return nil
}
// GetFrom decodes REQUESTED-TRANSPORT from message.
func (t *RequestedTransport) GetFrom(m *stun.Message) error {
v, err := m.Get(stun.AttrRequestedTransport)
if err != nil {
return err
}
if err = stun.CheckSize(stun.AttrRequestedTransport, len(v), requestedTransportSize); err != nil {
return err
}
t.Protocol = Protocol(v[0])
return nil
}
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