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serializer.go
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serializer.go
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package socksaddr
import (
"encoding/binary"
"io"
"github.com/sagernet/uot/common"
"github.com/sagernet/uot/common/exceptions"
"github.com/sagernet/uot/common/rw"
)
type SerializerOption func(*Serializer)
func AddressFamilyByte(b byte, f Family) SerializerOption {
return func(s *Serializer) {
s.familyMap[b] = f
s.familyByteMap[f] = b
}
}
func PortThenAddress() SerializerOption {
return func(s *Serializer) {
s.portFirst = true
}
}
func WithFamilyParser(fp FamilyParser) SerializerOption {
return func(s *Serializer) {
s.familyParser = fp
}
}
type Serializer struct {
familyMap map[byte]Family
familyByteMap map[Family]byte
familyParser FamilyParser
portFirst bool
}
func NewSerializer(options ...SerializerOption) *Serializer {
s := &Serializer{
familyMap: make(map[byte]Family),
familyByteMap: make(map[Family]byte),
}
for _, option := range options {
option(s)
}
return s
}
func (s *Serializer) WriteAddress(writer io.Writer, addr Addr) error {
err := rw.WriteByte(writer, s.familyByteMap[addr.Family()])
if err != nil {
return err
}
if addr.Family().IsIP() {
err = rw.WriteBytes(writer, addr.Addr().AsSlice())
} else {
domain := addr.Fqdn()
err = WriteString(writer, "fqdn", domain)
}
return err
}
func (s *Serializer) WritePort(writer io.Writer, port uint16) error {
return binary.Write(writer, binary.BigEndian, port)
}
func (s *Serializer) WriteAddressAndPort(writer io.Writer, addr Addr, port uint16) error {
var err error
if !s.portFirst {
err = s.WriteAddress(writer, addr)
} else {
err = s.WritePort(writer, port)
}
if err != nil {
return err
}
if s.portFirst {
err = s.WriteAddress(writer, addr)
} else {
err = s.WritePort(writer, port)
}
return err
}
func (s *Serializer) ReadAddress(reader io.Reader) (Addr, error) {
af, err := rw.ReadByte(reader)
if err != nil {
return nil, err
}
if s.familyParser != nil {
af = s.familyParser(af)
}
family := s.familyMap[af]
switch family {
case AddressFamilyFqdn:
fqdn, err := ReadString(reader)
if err != nil {
return nil, exceptions.Cause(err, "read fqdn")
}
return AddrFqdn(fqdn), nil
default:
switch family {
case AddressFamilyIPv4:
var addr [4]byte
err = common.Error(reader.Read(addr[:]))
if err != nil {
return nil, exceptions.Cause(err, "read ipv4 address")
}
return Addr4(addr), nil
case AddressFamilyIPv6:
var addr [16]byte
err = common.Error(reader.Read(addr[:]))
if err != nil {
return nil, exceptions.Cause(err, "read ipv6 address")
}
return Addr16(addr), nil
default:
return nil, exceptions.New("unknown address family: ", af)
}
}
}
func (s *Serializer) ReadPort(reader io.Reader) (uint16, error) {
port, err := rw.ReadBytes(reader, 2)
if err != nil {
return 0, exceptions.Cause(err, "read port")
}
return binary.BigEndian.Uint16(port), nil
}
func (s *Serializer) ReadAddressAndPort(reader io.Reader) (addr Addr, port uint16, err error) {
if !s.portFirst {
addr, err = s.ReadAddress(reader)
} else {
port, err = s.ReadPort(reader)
}
if err != nil {
return
}
if s.portFirst {
addr, err = s.ReadAddress(reader)
} else {
port, err = s.ReadPort(reader)
}
return
}
func ReadString(reader io.Reader) (string, error) {
strLen, err := rw.ReadByte(reader)
if err != nil {
return common.EmptyString, err
}
return rw.ReadString(reader, int(strLen))
}
func WriteString(writer io.Writer, op string, str string) error {
strLen := len(str)
if strLen > 255 {
return &StringTooLongException{op, strLen}
}
err := rw.WriteByte(writer, byte(strLen))
if err != nil {
return err
}
return rw.WriteString(writer, str)
}