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client.go
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client.go
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package encoding
import (
"crypto/md5"
"crypto/rand"
"hash/fnv"
"io"
"v2ray.com/core/common/crypto"
"v2ray.com/core/common/log"
v2net "v2ray.com/core/common/net"
"v2ray.com/core/common/protocol"
"v2ray.com/core/proxy/vmess"
"v2ray.com/core/transport"
)
func hashTimestamp(t protocol.Timestamp) []byte {
bytes := make([]byte, 0, 32)
bytes = t.Bytes(bytes)
bytes = t.Bytes(bytes)
bytes = t.Bytes(bytes)
bytes = t.Bytes(bytes)
return bytes
}
type ClientSession struct {
requestBodyKey []byte
requestBodyIV []byte
responseHeader byte
responseBodyKey []byte
responseBodyIV []byte
responseReader io.Reader
idHash protocol.IDHash
}
func NewClientSession(idHash protocol.IDHash) *ClientSession {
randomBytes := make([]byte, 33) // 16 + 16 + 1
rand.Read(randomBytes)
session := &ClientSession{}
session.requestBodyKey = randomBytes[:16]
session.requestBodyIV = randomBytes[16:32]
session.responseHeader = randomBytes[32]
responseBodyKey := md5.Sum(session.requestBodyKey)
responseBodyIV := md5.Sum(session.requestBodyIV)
session.responseBodyKey = responseBodyKey[:]
session.responseBodyIV = responseBodyIV[:]
session.idHash = idHash
return session
}
func (this *ClientSession) EncodeRequestHeader(header *protocol.RequestHeader, writer io.Writer) {
timestamp := protocol.NewTimestampGenerator(protocol.NowTime(), 30)()
account, err := header.User.GetTypedAccount()
if err != nil {
log.Error("VMess: Failed to get user account: ", err)
return
}
idHash := this.idHash(account.(*vmess.InternalAccount).AnyValidID().Bytes())
idHash.Write(timestamp.Bytes(nil))
writer.Write(idHash.Sum(nil))
buffer := make([]byte, 0, 512)
buffer = append(buffer, Version)
buffer = append(buffer, this.requestBodyIV...)
buffer = append(buffer, this.requestBodyKey...)
buffer = append(buffer, this.responseHeader, byte(header.Option), byte(0), byte(0), byte(header.Command))
buffer = header.Port.Bytes(buffer)
switch header.Address.Family() {
case v2net.AddressFamilyIPv4:
buffer = append(buffer, AddrTypeIPv4)
buffer = append(buffer, header.Address.IP()...)
case v2net.AddressFamilyIPv6:
buffer = append(buffer, AddrTypeIPv6)
buffer = append(buffer, header.Address.IP()...)
case v2net.AddressFamilyDomain:
buffer = append(buffer, AddrTypeDomain, byte(len(header.Address.Domain())))
buffer = append(buffer, header.Address.Domain()...)
}
fnv1a := fnv.New32a()
fnv1a.Write(buffer)
buffer = fnv1a.Sum(buffer)
timestampHash := md5.New()
timestampHash.Write(hashTimestamp(timestamp))
iv := timestampHash.Sum(nil)
aesStream := crypto.NewAesEncryptionStream(account.(*vmess.InternalAccount).ID.CmdKey(), iv)
aesStream.XORKeyStream(buffer, buffer)
writer.Write(buffer)
return
}
func (this *ClientSession) EncodeRequestBody(writer io.Writer) io.Writer {
aesStream := crypto.NewAesEncryptionStream(this.requestBodyKey, this.requestBodyIV)
return crypto.NewCryptionWriter(aesStream, writer)
}
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 (this *ClientSession) DecodeResponseBody(reader io.Reader) io.Reader {
return this.responseReader
}