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package proto
import (
"errors"
"github.com/pion/stun"
)
// RequestedAddressFamily represents the REQUESTED-ADDRESS-FAMILY Attribute as
// defined in RFC 6156 Section 4.1.1.
type RequestedAddressFamily byte
const requestedFamilySize = 4
var errInvalidRequestedFamilyValue = errors.New("invalid value for requested family attribute")
// GetFrom decodes REQUESTED-ADDRESS-FAMILY from message.
func (f *RequestedAddressFamily) GetFrom(m *stun.Message) error {
v, err := m.Get(stun.AttrRequestedAddressFamily)
if err != nil {
return err
}
if err = stun.CheckSize(stun.AttrRequestedAddressFamily, len(v), requestedFamilySize); err != nil {
return err
}
switch v[0] {
case byte(RequestedFamilyIPv4), byte(RequestedFamilyIPv6):
*f = RequestedAddressFamily(v[0])
default:
return errInvalidRequestedFamilyValue
}
return nil
}
func (f RequestedAddressFamily) String() string {
switch f {
case RequestedFamilyIPv4:
return "IPv4"
case RequestedFamilyIPv6:
return "IPv6"
default:
return "unknown"
}
}
// AddTo adds REQUESTED-ADDRESS-FAMILY to message.
func (f RequestedAddressFamily) AddTo(m *stun.Message) error {
v := make([]byte, requestedFamilySize)
v[0] = byte(f)
// 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.AttrRequestedAddressFamily, v)
return nil
}
// Values for RequestedAddressFamily as defined in RFC 6156 Section 4.1.1.
const (
RequestedFamilyIPv4 RequestedAddressFamily = 0x01
RequestedFamilyIPv6 RequestedAddressFamily = 0x02
)
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