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// Package stun implements Session Traversal Utilities for NAT (STUN) RFC 5389.
//
// The stun package is intended to use by package that implements extension
// to STUN (e.g. TURN) or client/server applications.
//
// Most methods are designed to be zero allocations. If it is not enough,
// low-level methods are available. On other hand, there are helpers that
// reduce code repeat.
//
// See examples for Message for basic usage, or https://github.com/pion/turn
// package for example of stun extension implementation.
package stun
import (
"encoding/binary"
"io"
)
// bin is shorthand to binary.BigEndian.
var bin = binary.BigEndian
func readFullOrPanic(r io.Reader, v []byte) int {
n, err := io.ReadFull(r, v)
if err != nil {
panic(err) // nolint
}
return n
}
func writeOrPanic(w io.Writer, v []byte) int {
n, err := w.Write(v)
if err != nil {
panic(err) // nolint
}
return n
}
// IANA assigned ports for "stun" protocol.
const (
DefaultPort = 3478
DefaultTLSPort = 5349
)
type transactionIDSetter struct{}
func (transactionIDSetter) AddTo(m *Message) error {
return m.NewTransactionID()
}
// TransactionID is Setter for m.TransactionID.
var TransactionID Setter = transactionIDSetter{}
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