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