func (v *ServerSession) DecodeRequestBody(request *protocol.RequestHeader, reader io.Reader) buf.Reader {
aggressive := (request.Command == protocol.RequestCommandTCP)
var authReader io.Reader
if request.Security.Is(protocol.SecurityType_NONE) {
if request.Option.Has(protocol.RequestOptionChunkStream) {
auth := &crypto.AEADAuthenticator{
AEAD: new(FnvAuthenticator),
NonceGenerator: crypto.NoOpBytesGenerator{},
AdditionalDataGenerator: crypto.NoOpBytesGenerator{},
}
authReader = crypto.NewAuthenticationReader(auth, reader, aggressive)
} else {
authReader = reader
}
} else if request.Security.Is(protocol.SecurityType_LEGACY) {
aesStream := crypto.NewAesDecryptionStream(v.requestBodyKey, v.requestBodyIV)
cryptionReader := crypto.NewCryptionReader(aesStream, reader)
if request.Option.Has(protocol.RequestOptionChunkStream) {
auth := &crypto.AEADAuthenticator{
AEAD: new(FnvAuthenticator),
NonceGenerator: crypto.NoOpBytesGenerator{},
AdditionalDataGenerator: crypto.NoOpBytesGenerator{},
}
authReader = crypto.NewAuthenticationReader(auth, cryptionReader, aggressive)
} else {
authReader = cryptionReader
}
} else if request.Security.Is(protocol.SecurityType_AES128_GCM) {
block, _ := aes.NewCipher(v.requestBodyKey)
aead, _ := cipher.NewGCM(block)
auth := &crypto.AEADAuthenticator{
AEAD: aead,
NonceGenerator: &ChunkNonceGenerator{
Nonce: append([]byte(nil), v.requestBodyIV...),
Size: aead.NonceSize(),
},
AdditionalDataGenerator: crypto.NoOpBytesGenerator{},
}
authReader = crypto.NewAuthenticationReader(auth, reader, aggressive)
} else if request.Security.Is(protocol.SecurityType_CHACHA20_POLY1305) {
aead, _ := chacha20poly1305.New(GenerateChacha20Poly1305Key(v.requestBodyKey))
auth := &crypto.AEADAuthenticator{
AEAD: aead,
NonceGenerator: &ChunkNonceGenerator{
Nonce: append([]byte(nil), v.requestBodyIV...),
Size: aead.NonceSize(),
},
AdditionalDataGenerator: crypto.NoOpBytesGenerator{},
}
authReader = crypto.NewAuthenticationReader(auth, reader, aggressive)
}
return buf.NewReader(authReader)
}
func ReadTCPResponse(user *protocol.User, reader io.Reader) (buf.Reader, error) {
rawAccount, err := user.GetTypedAccount()
if err != nil {
return nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to parse account.")
}
account := rawAccount.(*ShadowsocksAccount)
iv := make([]byte, account.Cipher.IVSize())
_, err = io.ReadFull(reader, iv)
if err != nil {
return nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to read IV.")
}
stream, err := account.Cipher.NewDecodingStream(account.Key, iv)
if err != nil {
return nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to initialize decoding stream.")
}
return buf.NewReader(crypto.NewCryptionReader(stream, reader)), nil
}
func (this *ClientSession) DecodeResponseHeader(reader io.Reader) (*protocol.ResponseHeader, error) {
aesStream := crypto.NewAesDecryptionStream(this.responseBodyKey, this.responseBodyIV)
this.responseReader = crypto.NewCryptionReader(aesStream, reader)
buffer := make([]byte, 256)
_, err := io.ReadFull(this.responseReader, buffer[:4])
if err != nil {
log.Info("Raw: Failed to read response header: ", err)
return nil, err
}
if buffer[0] != this.responseHeader {
log.Info("Raw: Unexpected response header. Expecting ", this.responseHeader, " but actually ", buffer[0])
return nil, transport.ErrCorruptedPacket
}
header := &protocol.ResponseHeader{
Option: protocol.ResponseOption(buffer[1]),
}
if buffer[2] != 0 {
cmdId := buffer[2]
dataLen := int(buffer[3])
_, err := io.ReadFull(this.responseReader, buffer[:dataLen])
if err != nil {
log.Info("Raw: Failed to read response command: ", err)
return nil, err
}
data := buffer[:dataLen]
command, err := UnmarshalCommand(cmdId, data)
if err == nil {
header.Command = command
}
}
return header, nil
}
func (v *ClientSession) DecodeResponseHeader(reader io.Reader) (*protocol.ResponseHeader, error) {
aesStream := crypto.NewAesDecryptionStream(v.responseBodyKey, v.responseBodyIV)
v.responseReader = crypto.NewCryptionReader(aesStream, reader)
buffer := make([]byte, 256)
_, err := io.ReadFull(v.responseReader, buffer[:4])
if err != nil {
log.Info("VMess|Client: Failed to read response header: ", err)
return nil, err
}
if buffer[0] != v.responseHeader {
return nil, errors.Format("VMess|Client: Unexpected response header. Expecting %d but actually %d", v.responseHeader, buffer[0])
}
header := &protocol.ResponseHeader{
Option: protocol.ResponseOption(buffer[1]),
}
if buffer[2] != 0 {
cmdID := buffer[2]
dataLen := int(buffer[3])
_, err := io.ReadFull(v.responseReader, buffer[:dataLen])
if err != nil {
log.Info("VMess|Client: Failed to read response command: ", err)
return nil, err
}
data := buffer[:dataLen]
command, err := UnmarshalCommand(cmdID, data)
if err == nil {
header.Command = command
}
}
return header, nil
}
func ReadTCPSession(user *protocol.User, reader io.Reader) (*protocol.RequestHeader, buf.Reader, error) {
rawAccount, err := user.GetTypedAccount()
if err != nil {
return nil, nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to parse account.")
}
account := rawAccount.(*ShadowsocksAccount)
buffer := buf.NewLocal(512)
defer buffer.Release()
ivLen := account.Cipher.IVSize()
err = buffer.AppendSupplier(buf.ReadFullFrom(reader, ivLen))
if err != nil {
return nil, nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to read IV.")
}
iv := append([]byte(nil), buffer.BytesTo(ivLen)...)
stream, err := account.Cipher.NewDecodingStream(account.Key, iv)
if err != nil {
return nil, nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to initialize decoding stream.")
}
reader = crypto.NewCryptionReader(stream, reader)
authenticator := NewAuthenticator(HeaderKeyGenerator(account.Key, iv))
request := &protocol.RequestHeader{
Version: Version,
User: user,
Command: protocol.RequestCommandTCP,
}
buffer.Clear()
err = buffer.AppendSupplier(buf.ReadFullFrom(reader, 1))
if err != nil {
return nil, nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to read address type.")
}
addrType := (buffer.Byte(0) & 0x0F)
if (buffer.Byte(0) & 0x10) == 0x10 {
request.Option |= RequestOptionOneTimeAuth
}
if request.Option.Has(RequestOptionOneTimeAuth) && account.OneTimeAuth == Account_Disabled {
return nil, nil, errors.New("Shadowsocks|TCP: Rejecting connection with OTA enabled, while server disables OTA.")
}
if !request.Option.Has(RequestOptionOneTimeAuth) && account.OneTimeAuth == Account_Enabled {
return nil, nil, errors.New("Shadowsocks|TCP: Rejecting connection with OTA disabled, while server enables OTA.")
}
switch addrType {
case AddrTypeIPv4:
err := buffer.AppendSupplier(buf.ReadFullFrom(reader, 4))
if err != nil {
return nil, nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to read IPv4 address.")
}
request.Address = v2net.IPAddress(buffer.BytesFrom(-4))
case AddrTypeIPv6:
err := buffer.AppendSupplier(buf.ReadFullFrom(reader, 16))
if err != nil {
return nil, nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to read IPv6 address.")
}
request.Address = v2net.IPAddress(buffer.BytesFrom(-16))
case AddrTypeDomain:
err := buffer.AppendSupplier(buf.ReadFullFrom(reader, 1))
if err != nil {
return nil, nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to read domain lenth.")
}
domainLength := int(buffer.BytesFrom(-1)[0])
err = buffer.AppendSupplier(buf.ReadFullFrom(reader, domainLength))
if err != nil {
return nil, nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to read domain.")
}
request.Address = v2net.DomainAddress(string(buffer.BytesFrom(-domainLength)))
default:
// Check address validity after OTA verification.
}
err = buffer.AppendSupplier(buf.ReadFullFrom(reader, 2))
if err != nil {
return nil, nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to read port.")
}
request.Port = v2net.PortFromBytes(buffer.BytesFrom(-2))
if request.Option.Has(RequestOptionOneTimeAuth) {
actualAuth := make([]byte, AuthSize)
authenticator.Authenticate(buffer.Bytes())(actualAuth)
err := buffer.AppendSupplier(buf.ReadFullFrom(reader, AuthSize))
if err != nil {
return nil, nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to read OTA.")
}
if !bytes.Equal(actualAuth, buffer.BytesFrom(-AuthSize)) {
return nil, nil, errors.New("Shadowsocks|TCP: Invalid OTA")
}
}
if request.Address == nil {
return nil, nil, errors.New("Shadowsocks|TCP: Invalid remote address.")
}
var chunkReader buf.Reader
if request.Option.Has(RequestOptionOneTimeAuth) {
chunkReader = NewChunkReader(reader, NewAuthenticator(ChunkKeyGenerator(iv)))
} else {
chunkReader = buf.NewReader(reader)
}
return request, chunkReader, nil
}
func (this *ServerSession) DecodeRequestHeader(reader io.Reader) (*protocol.RequestHeader, error) {
buffer := make([]byte, 512)
_, err := io.ReadFull(reader, buffer[:protocol.IDBytesLen])
if err != nil {
log.Info("Raw: Failed to read request header: ", err)
return nil, io.EOF
}
user, timestamp, valid := this.userValidator.Get(buffer[:protocol.IDBytesLen])
if !valid {
return nil, protocol.ErrInvalidUser
}
timestampHash := md5.New()
timestampHash.Write(hashTimestamp(timestamp))
iv := timestampHash.Sum(nil)
account := user.Account.(*vmess.Account)
aesStream := crypto.NewAesDecryptionStream(account.ID.CmdKey(), iv)
decryptor := crypto.NewCryptionReader(aesStream, reader)
nBytes, err := io.ReadFull(decryptor, buffer[:41])
if err != nil {
log.Debug("Raw: Failed to read request header (", nBytes, " bytes): ", err)
return nil, err
}
bufferLen := nBytes
request := &protocol.RequestHeader{
User: user,
Version: buffer[0],
}
if request.Version != Version {
log.Info("Raw: Invalid protocol version ", request.Version)
return nil, protocol.ErrInvalidVersion
}
this.requestBodyIV = append([]byte(nil), buffer[1:17]...) // 16 bytes
this.requestBodyKey = append([]byte(nil), buffer[17:33]...) // 16 bytes
this.responseHeader = buffer[33] // 1 byte
request.Option = protocol.RequestOption(buffer[34]) // 1 byte + 2 bytes reserved
request.Command = protocol.RequestCommand(buffer[37])
request.Port = v2net.PortFromBytes(buffer[38:40])
switch buffer[40] {
case AddrTypeIPv4:
nBytes, err = io.ReadFull(decryptor, buffer[41:45]) // 4 bytes
bufferLen += 4
if err != nil {
log.Debug("VMess: Failed to read target IPv4 (", nBytes, " bytes): ", err)
return nil, err
}
request.Address = v2net.IPAddress(buffer[41:45])
case AddrTypeIPv6:
nBytes, err = io.ReadFull(decryptor, buffer[41:57]) // 16 bytes
bufferLen += 16
if err != nil {
log.Debug("VMess: Failed to read target IPv6 (", nBytes, " bytes): ", nBytes, err)
return nil, err
}
request.Address = v2net.IPAddress(buffer[41:57])
case AddrTypeDomain:
nBytes, err = io.ReadFull(decryptor, buffer[41:42])
if err != nil {
log.Debug("VMess: Failed to read target domain (", nBytes, " bytes): ", nBytes, err)
return nil, err
}
domainLength := int(buffer[41])
if domainLength == 0 {
return nil, transport.ErrCorruptedPacket
}
nBytes, err = io.ReadFull(decryptor, buffer[42:42+domainLength])
if err != nil {
log.Debug("VMess: Failed to read target domain (", nBytes, " bytes): ", nBytes, err)
return nil, err
}
bufferLen += 1 + domainLength
request.Address = v2net.DomainAddress(string(buffer[42 : 42+domainLength]))
}
nBytes, err = io.ReadFull(decryptor, buffer[bufferLen:bufferLen+4])
if err != nil {
log.Debug("VMess: Failed to read checksum (", nBytes, " bytes): ", nBytes, err)
return nil, err
}
fnv1a := fnv.New32a()
fnv1a.Write(buffer[:bufferLen])
actualHash := fnv1a.Sum32()
expectedHash := serial.BytesToUint32(buffer[bufferLen : bufferLen+4])
if actualHash != expectedHash {
return nil, transport.ErrCorruptedPacket
}
return request, nil
}
func (this *ServerSession) DecodeRequestBody(reader io.Reader) io.Reader {
aesStream := crypto.NewAesDecryptionStream(this.requestBodyKey, this.requestBodyIV)
return crypto.NewCryptionReader(aesStream, reader)
}
func (v *ServerSession) DecodeRequestHeader(reader io.Reader) (*protocol.RequestHeader, error) {
buffer := make([]byte, 512)
_, err := io.ReadFull(reader, buffer[:protocol.IDBytesLen])
if err != nil {
log.Info("VMess|Server: Failed to read request header: ", err)
return nil, io.EOF
}
user, timestamp, valid := v.userValidator.Get(buffer[:protocol.IDBytesLen])
if !valid {
return nil, errors.New("VMess|Server: Invalid user.")
}
timestampHash := md5.New()
timestampHash.Write(hashTimestamp(timestamp))
iv := timestampHash.Sum(nil)
account, err := user.GetTypedAccount()
if err != nil {
return nil, errors.Base(err).Message("VMess|Server: Failed to get user account.")
}
aesStream := crypto.NewAesDecryptionStream(account.(*vmess.InternalAccount).ID.CmdKey(), iv)
decryptor := crypto.NewCryptionReader(aesStream, reader)
nBytes, err := io.ReadFull(decryptor, buffer[:41])
if err != nil {
return nil, errors.Base(err).Message("VMess|Server: Failed to read request header.")
}
bufferLen := nBytes
request := &protocol.RequestHeader{
User: user,
Version: buffer[0],
}
if request.Version != Version {
return nil, errors.New("VMess|Server: Invalid protocol version ", request.Version)
}
v.requestBodyIV = append([]byte(nil), buffer[1:17]...) // 16 bytes
v.requestBodyKey = append([]byte(nil), buffer[17:33]...) // 16 bytes
v.responseHeader = buffer[33] // 1 byte
request.Option = protocol.RequestOption(buffer[34]) // 1 byte
padingLen := int(buffer[35] >> 4)
request.Security = protocol.NormSecurity(protocol.Security(buffer[35] & 0x0F))
// 1 bytes reserved
request.Command = protocol.RequestCommand(buffer[37])
request.Port = v2net.PortFromBytes(buffer[38:40])
switch buffer[40] {
case AddrTypeIPv4:
_, err = io.ReadFull(decryptor, buffer[41:45]) // 4 bytes
bufferLen += 4
if err != nil {
return nil, errors.Base(err).Message("VMess|Server: Failed to read IPv4.")
}
request.Address = v2net.IPAddress(buffer[41:45])
case AddrTypeIPv6:
_, err = io.ReadFull(decryptor, buffer[41:57]) // 16 bytes
bufferLen += 16
if err != nil {
return nil, errors.Base(err).Message("VMess|Server: Failed to read IPv6 address.")
}
request.Address = v2net.IPAddress(buffer[41:57])
case AddrTypeDomain:
_, err = io.ReadFull(decryptor, buffer[41:42])
if err != nil {
return nil, errors.Base(err).Message("VMess:Server: Failed to read domain.")
}
domainLength := int(buffer[41])
if domainLength == 0 {
return nil, errors.New("VMess|Server: Zero length domain.")
}
_, err = io.ReadFull(decryptor, buffer[42:42+domainLength])
if err != nil {
return nil, errors.Base(err).Message("VMess|Server: Failed to read domain.")
}
bufferLen += 1 + domainLength
request.Address = v2net.DomainAddress(string(buffer[42 : 42+domainLength]))
}
if padingLen > 0 {
_, err = io.ReadFull(decryptor, buffer[bufferLen:bufferLen+padingLen])
if err != nil {
return nil, errors.New("VMess|Server: Failed to read padding.")
}
bufferLen += padingLen
}
_, err = io.ReadFull(decryptor, buffer[bufferLen:bufferLen+4])
if err != nil {
return nil, errors.Base(err).Message("VMess|Server: Failed to read checksum.")
}
fnv1a := fnv.New32a()
fnv1a.Write(buffer[:bufferLen])
actualHash := fnv1a.Sum32()
expectedHash := serial.BytesToUint32(buffer[bufferLen : bufferLen+4])
if actualHash != expectedHash {
return nil, errors.New("VMess|Server: Invalid auth.")
}
if request.Address == nil {
return nil, errors.New("VMess|Server: Invalid remote address.")
}
return request, nil
}
func (this *Server) handlerUDPPayload(payload *alloc.Buffer, session *proxy.SessionInfo) {
defer payload.Release()
source := session.Source
ivLen := this.config.Cipher.IVSize()
iv := payload.Value[:ivLen]
key := this.config.Key
payload.SliceFrom(ivLen)
stream, err := this.config.Cipher.NewDecodingStream(key, iv)
if err != nil {
log.Error("Shadowsocks: Failed to create decoding stream: ", err)
return
}
reader := crypto.NewCryptionReader(stream, payload)
request, err := ReadRequest(reader, NewAuthenticator(HeaderKeyGenerator(key, iv)), true)
if err != nil {
if err != io.EOF {
log.Access(source, "", log.AccessRejected, err)
log.Warning("Shadowsocks: Invalid request from ", source, ": ", err)
}
return
}
//defer request.Release()
dest := v2net.UDPDestination(request.Address, request.Port)
log.Access(source, dest, log.AccessAccepted, "")
log.Info("Shadowsocks: Tunnelling request to ", dest)
this.udpServer.Dispatch(&proxy.SessionInfo{Source: source, Destination: dest}, request.DetachUDPPayload(), func(destination v2net.Destination, payload *alloc.Buffer) {
defer payload.Release()
response := alloc.NewBuffer().Slice(0, ivLen)
defer response.Release()
rand.Read(response.Value)
respIv := response.Value
stream, err := this.config.Cipher.NewEncodingStream(key, respIv)
if err != nil {
log.Error("Shadowsocks: Failed to create encoding stream: ", err)
return
}
writer := crypto.NewCryptionWriter(stream, response)
switch request.Address.Family() {
case v2net.AddressFamilyIPv4:
writer.Write([]byte{AddrTypeIPv4})
writer.Write(request.Address.IP())
case v2net.AddressFamilyIPv6:
writer.Write([]byte{AddrTypeIPv6})
writer.Write(request.Address.IP())
case v2net.AddressFamilyDomain:
writer.Write([]byte{AddrTypeDomain, byte(len(request.Address.Domain()))})
writer.Write([]byte(request.Address.Domain()))
}
writer.Write(request.Port.Bytes(nil))
writer.Write(payload.Value)
if request.OTA {
respAuth := NewAuthenticator(HeaderKeyGenerator(key, respIv))
respAuth.Authenticate(response.Value, response.Value[ivLen:])
}
this.udpHub.WriteTo(response.Value, source)
})
}
func (this *Server) handleConnection(conn internet.Connection) {
defer conn.Close()
buffer := alloc.NewSmallBuffer()
defer buffer.Release()
timedReader := v2net.NewTimeOutReader(16, conn)
defer timedReader.Release()
bufferedReader := v2io.NewBufferedReader(timedReader)
defer bufferedReader.Release()
ivLen := this.config.Cipher.IVSize()
_, err := io.ReadFull(bufferedReader, buffer.Value[:ivLen])
if err != nil {
if err != io.EOF {
log.Access(conn.RemoteAddr(), "", log.AccessRejected, err)
log.Warning("Shadowsocks: Failed to read IV: ", err)
}
return
}
iv := buffer.Value[:ivLen]
key := this.config.Key
stream, err := this.config.Cipher.NewDecodingStream(key, iv)
if err != nil {
log.Error("Shadowsocks: Failed to create decoding stream: ", err)
return
}
reader := crypto.NewCryptionReader(stream, bufferedReader)
request, err := ReadRequest(reader, NewAuthenticator(HeaderKeyGenerator(key, iv)), false)
if err != nil {
log.Access(conn.RemoteAddr(), "", log.AccessRejected, err)
log.Warning("Shadowsocks: Invalid request from ", conn.RemoteAddr(), ": ", err)
return
}
defer request.Release()
bufferedReader.SetCached(false)
userSettings := protocol.GetUserSettings(this.config.Level)
timedReader.SetTimeOut(userSettings.PayloadReadTimeout)
dest := v2net.TCPDestination(request.Address, request.Port)
log.Access(conn.RemoteAddr(), dest, log.AccessAccepted, "")
log.Info("Shadowsocks: Tunnelling request to ", dest)
ray := this.packetDispatcher.DispatchToOutbound(this.meta, &proxy.SessionInfo{
Source: v2net.DestinationFromAddr(conn.RemoteAddr()),
Destination: dest,
})
defer ray.InboundOutput().Release()
var writeFinish sync.Mutex
writeFinish.Lock()
go func() {
if payload, err := ray.InboundOutput().Read(); err == nil {
payload.SliceBack(ivLen)
rand.Read(payload.Value[:ivLen])
stream, err := this.config.Cipher.NewEncodingStream(key, payload.Value[:ivLen])
if err != nil {
log.Error("Shadowsocks: Failed to create encoding stream: ", err)
return
}
stream.XORKeyStream(payload.Value[ivLen:], payload.Value[ivLen:])
conn.Write(payload.Value)
payload.Release()
writer := crypto.NewCryptionWriter(stream, conn)
v2writer := v2io.NewAdaptiveWriter(writer)
v2io.Pipe(ray.InboundOutput(), v2writer)
writer.Release()
v2writer.Release()
}
writeFinish.Unlock()
}()
var payloadReader v2io.Reader
if request.OTA {
payloadAuth := NewAuthenticator(ChunkKeyGenerator(iv))
payloadReader = NewChunkReader(reader, payloadAuth)
} else {
payloadReader = v2io.NewAdaptiveReader(reader)
}
v2io.Pipe(payloadReader, ray.InboundInput())
ray.InboundInput().Close()
payloadReader.Release()
writeFinish.Lock()
}
func ReadTCPSession(user *protocol.User, reader io.Reader) (*protocol.RequestHeader, v2io.Reader, error) {
rawAccount, err := user.GetTypedAccount()
if err != nil {
return nil, nil, errors.New("Shadowsocks|TCP: Failed to parse account: " + err.Error())
}
account := rawAccount.(*ShadowsocksAccount)
buffer := alloc.NewLocalBuffer(512)
defer buffer.Release()
ivLen := account.Cipher.IVSize()
_, err = io.ReadFull(reader, buffer.Value[:ivLen])
if err != nil {
return nil, nil, errors.New("Shadowsocks|TCP: Failed to read IV: " + err.Error())
}
iv := append([]byte(nil), buffer.Value[:ivLen]...)
stream, err := account.Cipher.NewDecodingStream(account.Key, iv)
if err != nil {
return nil, nil, errors.New("Shadowsocks|TCP: Failed to initialize decoding stream: " + err.Error())
}
reader = crypto.NewCryptionReader(stream, reader)
authenticator := NewAuthenticator(HeaderKeyGenerator(account.Key, iv))
request := &protocol.RequestHeader{
Version: Version,
User: user,
Command: protocol.RequestCommandTCP,
}
lenBuffer := 1
_, err = io.ReadFull(reader, buffer.Value[:1])
if err != nil {
return nil, nil, errors.New("Sahdowsocks|TCP: Failed to read address type: " + err.Error())
}
addrType := (buffer.Value[0] & 0x0F)
if (buffer.Value[0] & 0x10) == 0x10 {
request.Option |= RequestOptionOneTimeAuth
}
switch addrType {
case AddrTypeIPv4:
_, err := io.ReadFull(reader, buffer.Value[lenBuffer:lenBuffer+4])
if err != nil {
return nil, nil, errors.New("Shadowsocks|TCP: Failed to read IPv4 address: " + err.Error())
}
request.Address = v2net.IPAddress(buffer.Value[lenBuffer : lenBuffer+4])
lenBuffer += 4
case AddrTypeIPv6:
_, err := io.ReadFull(reader, buffer.Value[lenBuffer:lenBuffer+16])
if err != nil {
return nil, nil, errors.New("Shadowsocks|TCP: Failed to read IPv6 address: " + err.Error())
}
request.Address = v2net.IPAddress(buffer.Value[lenBuffer : lenBuffer+16])
lenBuffer += 16
case AddrTypeDomain:
_, err := io.ReadFull(reader, buffer.Value[lenBuffer:lenBuffer+1])
if err != nil {
return nil, nil, errors.New("Shadowsocks|TCP: Failed to read domain lenth: " + err.Error())
}
domainLength := int(buffer.Value[lenBuffer])
lenBuffer++
_, err = io.ReadFull(reader, buffer.Value[lenBuffer:lenBuffer+domainLength])
if err != nil {
return nil, nil, errors.New("Shadowsocks|TCP: Failed to read domain: " + err.Error())
}
request.Address = v2net.DomainAddress(string(buffer.Value[lenBuffer : lenBuffer+domainLength]))
lenBuffer += domainLength
default:
return nil, nil, errors.New("Shadowsocks|TCP: Unknown address type.")
}
_, err = io.ReadFull(reader, buffer.Value[lenBuffer:lenBuffer+2])
if err != nil {
return nil, nil, errors.New("Shadowsocks|TCP: Failed to read port: " + err.Error())
}
request.Port = v2net.PortFromBytes(buffer.Value[lenBuffer : lenBuffer+2])
lenBuffer += 2
if request.Option.Has(RequestOptionOneTimeAuth) {
authBytes := buffer.Value[lenBuffer : lenBuffer+AuthSize]
_, err = io.ReadFull(reader, authBytes)
if err != nil {
return nil, nil, errors.New("Shadowsocks|TCP: Failed to read OTA: " + err.Error())
}
actualAuth := authenticator.Authenticate(nil, buffer.Value[0:lenBuffer])
if !bytes.Equal(actualAuth, authBytes) {
return nil, nil, errors.New("Shadowsocks|TCP: Invalid OTA")
}
}
var chunkReader v2io.Reader
if request.Option.Has(RequestOptionOneTimeAuth) {
chunkReader = NewChunkReader(reader, NewAuthenticator(ChunkKeyGenerator(iv)))
} else {
chunkReader = v2io.NewAdaptiveReader(reader)
}
return request, chunkReader, nil
}