mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-10-29 15:27:32 -04:00
67 lines
1.4 KiB
Go
67 lines
1.4 KiB
Go
// Package socks contains protocol definition and io lib for SOCKS5 protocol
|
|
package socks
|
|
|
|
import (
|
|
"fmt"
|
|
"io"
|
|
)
|
|
|
|
const (
|
|
socksVersion = uint8(5)
|
|
)
|
|
|
|
// Authentication request header of Socks5 protocol
|
|
type Socks5AuthenticationRequest struct {
|
|
version byte
|
|
authMethods [256]byte
|
|
}
|
|
|
|
func ReadAuthentication(reader io.Reader) (auth Socks5AuthenticationRequest, err error) {
|
|
buffer := make([]byte, 2)
|
|
nBytes, err := reader.Read(buffer)
|
|
if err != nil {
|
|
return
|
|
}
|
|
if nBytes < 2 {
|
|
err = fmt.Errorf("Expected 2 bytes read, but actaully %d bytes read", nBytes)
|
|
return
|
|
}
|
|
|
|
auth.version = buffer[0]
|
|
if auth.version != socksVersion {
|
|
err = fmt.Errorf("Unknown SOCKS version %d", auth.version)
|
|
return
|
|
}
|
|
|
|
nMethods := buffer[1]
|
|
if nMethods <= 0 {
|
|
err = fmt.Errorf("Zero length of authentication methods")
|
|
return
|
|
}
|
|
|
|
buffer = make([]byte, nMethods)
|
|
nBytes, err = reader.Read(buffer)
|
|
copy(auth.authMethods[:nBytes], buffer)
|
|
return
|
|
}
|
|
|
|
type Socks5AuthenticationResponse struct {
|
|
version byte
|
|
authMethod byte
|
|
}
|
|
|
|
func (r *Socks5AuthenticationResponse) ToBytes() []byte {
|
|
buffer := make([]byte, 2 /* size of Socks5AuthenticationResponse */)
|
|
buffer[0] = r.version
|
|
buffer[1] = r.authMethod
|
|
return buffer
|
|
}
|
|
|
|
func WriteAuthentication(writer io.Writer, response Socks5AuthenticationResponse) error {
|
|
_, err := writer.Write(response.ToBytes())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|