forked from qdeconinck/mp-quic
/
add_address_frame.go
125 lines (107 loc) · 2.27 KB
/
add_address_frame.go
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package wire
import (
"bytes"
"errors"
"net"
"github.com/lucas-clemente/quic-go/internal/protocol"
"github.com/lucas-clemente/quic-go/internal/utils"
)
var (
ErrUnknownIPVersion = errors.New("AddAddressFrame: unknown IP version")
)
var (
errInconsistentAddrIPVersion = errors.New("internal inconsistency: Addr does not match IP version")
)
// A AddAddressFrame in QUIC
type AddAddressFrame struct {
IPVersion uint8
Addr net.UDPAddr
}
func (f *AddAddressFrame) Write(b *bytes.Buffer, version protocol.VersionNumber) error {
typeByte := uint8(0x10)
b.WriteByte(typeByte)
b.WriteByte(f.IPVersion)
switch f.IPVersion {
case 4:
ip := f.Addr.IP.To4()
if ip == nil {
return errInconsistentAddrIPVersion
}
for i := 0; i < 4; i++ {
b.WriteByte(ip[i])
}
case 6:
ip := f.Addr.IP.To16()
if ip == nil {
return errInconsistentAddrIPVersion
}
for i := 0; i < 16; i++ {
b.WriteByte(ip[i])
}
default:
return ErrUnknownIPVersion
}
utils.GetByteOrder(version).WriteUint16(b, uint16(f.Addr.Port))
return nil
}
func ParseAddAddressFrame(r *bytes.Reader, version protocol.VersionNumber) (*AddAddressFrame, error) {
frame := &AddAddressFrame{}
// read the TypeByte
_, err := r.ReadByte()
if err != nil {
return nil, err
}
ipv, err := r.ReadByte()
if err != nil {
return nil, err
}
frame.IPVersion = ipv
switch frame.IPVersion {
case 4:
a, err := r.ReadByte()
if err != nil {
return nil, err
}
b, err := r.ReadByte()
if err != nil {
return nil, err
}
c, err := r.ReadByte()
if err != nil {
return nil, err
}
d, err := r.ReadByte()
if err != nil {
return nil, err
}
frame.Addr.IP = net.IPv4(a, b, c, d)
case 6:
ip := make([]byte, 16)
for i := 0; i < net.IPv6len; i++ {
b, err := r.ReadByte()
if err != nil {
return nil, err
}
ip[i] = b
}
frame.Addr.IP = net.IP(ip)
default:
return nil, ErrUnknownIPVersion
}
port, err := utils.GetByteOrder(version).ReadUint16(r)
if err != nil {
return nil, err
}
frame.Addr.Port = int(port)
return frame, nil
}
func (f* AddAddressFrame) MinLength(version protocol.VersionNumber) (protocol.ByteCount, error) {
switch f.IPVersion {
case 4:
return 1 + 1 + 4 + 2, nil
case 6:
return 1 + 1 + 16 + 2, nil
default:
return 0, ErrUnknownIPVersion
}
}