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client.go
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client.go
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package freedom
import (
"context"
"net"
"github.com/txthinking/socks5"
"golang.org/x/net/proxy"
"github.com/faireal/trojan-go/common"
"github.com/faireal/trojan-go/config"
"github.com/faireal/trojan-go/tunnel"
)
type Client struct {
preferIPv4 bool
noDelay bool
keepAlive bool
ctx context.Context
cancel context.CancelFunc
forwardProxy bool
proxyAddr *tunnel.Address
username string
password string
}
func (c *Client) DialConn(addr *tunnel.Address, _ tunnel.Tunnel) (tunnel.Conn, error) {
// forward proxy
if c.forwardProxy {
var auth *proxy.Auth
if c.username != "" {
auth = &proxy.Auth{
User: c.username,
Password: c.password,
}
}
dialer, err := proxy.SOCKS5("tcp", c.proxyAddr.String(), auth, proxy.Direct)
if err != nil {
return nil, common.NewError("freedom failed to init socks dialer")
}
conn, err := dialer.Dial("tcp", addr.String())
if err != nil {
return nil, common.NewError("freedom failed to dial target address via socks proxy " + addr.String()).Base(err)
}
return &Conn{
Conn: conn,
}, nil
}
network := "tcp"
if c.preferIPv4 {
network = "tcp4"
}
dialer := new(net.Dialer)
tcpConn, err := dialer.DialContext(c.ctx, network, addr.String())
if err != nil {
return nil, common.NewError("freedom failed to dial " + addr.String()).Base(err)
}
tcpConn.(*net.TCPConn).SetKeepAlive(c.keepAlive)
tcpConn.(*net.TCPConn).SetNoDelay(c.noDelay)
return &Conn{
Conn: tcpConn,
}, nil
}
func (c *Client) DialPacket(tunnel.Tunnel) (tunnel.PacketConn, error) {
if c.forwardProxy {
socksClient, err := socks5.NewClient(c.proxyAddr.String(), c.username, c.password, 0, 0)
common.Must(err)
if err := socksClient.Negotiate(&net.TCPAddr{}); err != nil {
return nil, common.NewError("freedom failed to negotiate socks").Base(err)
}
a, addr, port, err := socks5.ParseAddress("1.1.1.1:53") // useless address
common.Must(err)
resp, err := socksClient.Request(socks5.NewRequest(socks5.CmdUDP, a, addr, port))
if err != nil {
return nil, common.NewError("freedom failed to dial udp to socks").Base(err)
}
// TODO fix hardcoded localhost
packetConn, err := net.ListenPacket("udp", "127.0.0.1:0")
if err != nil {
return nil, common.NewError("freedom failed to listen udp").Base(err)
}
socksAddr, err := net.ResolveUDPAddr("udp", resp.Address())
if err != nil {
return nil, common.NewError("freedom recv invalid socks bind addr").Base(err)
}
return &SocksPacketConn{
PacketConn: packetConn,
socksAddr: socksAddr,
socksClient: socksClient,
}, nil
}
network := "udp"
if c.preferIPv4 {
network = "udp4"
}
udpConn, err := net.ListenPacket(network, "")
if err != nil {
return nil, common.NewError("freedom failed to listen udp socket").Base(err)
}
return &PacketConn{
UDPConn: udpConn.(*net.UDPConn),
}, nil
}
func (c *Client) Close() error {
c.cancel()
return nil
}
func NewClient(ctx context.Context, _ tunnel.Client) (*Client, error) {
cfg := config.FromContext(ctx, Name).(*Config)
addr := tunnel.NewAddressFromHostPort("tcp", cfg.ForwardProxy.ProxyHost, cfg.ForwardProxy.ProxyPort)
ctx, cancel := context.WithCancel(ctx)
return &Client{
ctx: ctx,
cancel: cancel,
noDelay: cfg.TCP.NoDelay,
keepAlive: cfg.TCP.KeepAlive,
preferIPv4: cfg.TCP.PreferIPV4,
forwardProxy: cfg.ForwardProxy.Enabled,
proxyAddr: addr,
username: cfg.ForwardProxy.Username,
password: cfg.ForwardProxy.Password,
}, nil
}