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client.go
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client.go
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package socks
import (
"fmt"
"io"
"net"
"net/url"
"strings"
"github.com/layou233/ZBProxy/outbound"
)
type Client struct {
Dialer outbound.Outbound
Version string
Network string
Address string
Username, Password string
Methods []byte
}
// NewClientFromURL
//
// socks(5)://username:password@127.0.0.1:1080
//
// socks4(a)://userid@127.0.0.1:1080
func NewClientFromURL(dialer outbound.Outbound, s string) (*Client, error) {
u, err := url.Parse(s)
if err != nil {
return nil, err
}
c := &Client{Dialer: dialer}
switch u.Scheme {
case "socks", "socks5", "":
c.Version = "5"
c.Username = u.User.Username()
c.Password, _ = u.User.Password()
case "socks4a":
c.Version = "4a"
c.Username = u.User.Username()
case "socks4":
c.Version = "4"
c.Username = u.User.Username()
default:
return nil, fmt.Errorf("socks: unknown SOCKS version: %v", u.Scheme)
}
c.Network = "tcp" // TODO: tcp4, tcp6 and unix support
c.Address = u.Host
return c, nil
}
func (c *Client) Dial(network, address string) (net.Conn, error) {
conn, err := c.Dialer.Dial(c.Network, c.Address)
if err != nil {
return nil, fmt.Errorf("socks: fail to dial to SOCKS server: %v", err)
}
if err = c.Handshake(conn, conn, network, address); err != nil {
conn.Close()
return nil, err
}
return conn, nil
}
func (c *Client) DialTCP(network string, laddr, raddr *net.TCPAddr) (*net.TCPConn, error) {
SAddr, err := net.ResolveTCPAddr(c.Network, c.Address)
if err != nil {
return nil, fmt.Errorf("socks: can't resolve SOCKS server address: %v", err)
}
conn, err := c.Dialer.DialTCP(c.Network, laddr, SAddr)
if err != nil {
return nil, fmt.Errorf("socks: fail to dial to SOCKS server: %v", err)
}
if err = c.Handshake(conn, conn, network, raddr.String()); err != nil {
conn.Close()
return nil, err
}
return conn, nil
}
func (c *Client) Handshake(r io.Reader, w io.Writer, network, address string) error {
switch c.GetVersion() {
case "5":
return c.handshake5(r, w, network, address)
case "4a":
return c.handshake4A(r, w, address)
case "4":
return c.handshake4(r, w, address)
}
return fmt.Errorf("socks: unknown SOCKS version: %v", c.Version)
}
func (c *Client) GetVersion() string {
c.Version = strings.ToLower(c.Version)
switch c.Version {
case "5", "4a", "4":
return c.Version
case "", "socks", "socks5":
return "5"
case "socks4a":
return "4a"
case "socks4":
return "4"
}
return "UNKNOWN"
}