2020-08-06 07:06:33 +00:00
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package ccsocks5
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2020-08-06 06:31:36 +00:00
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import (
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"errors"
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"net"
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"time"
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"golang.org/x/net/proxy"
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"github.com/thinkgos/go-socks5/bufferpool"
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"github.com/thinkgos/go-socks5/statute"
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)
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2020-08-06 07:06:33 +00:00
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// Client is socks5 client.
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2020-08-06 06:31:36 +00:00
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type Client struct {
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proxyAddr string
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auth *proxy.Auth
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// On command UDP, let server control the tcp and udp connection relationship
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2020-08-06 07:06:33 +00:00
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tcpConn *net.TCPConn
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net.Conn
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keepAlivePeriod time.Duration
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2020-08-06 06:31:36 +00:00
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bufferPool bufferpool.BufPool
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}
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2020-08-06 07:06:33 +00:00
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// NewClient This is just create a client, you need to use Dial to create conn.
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2020-08-06 06:31:36 +00:00
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func NewClient(proxyAddr string, opts ...Option) (*Client, error) {
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c := &Client{
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proxyAddr: proxyAddr,
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2020-08-06 07:06:33 +00:00
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keepAlivePeriod: time.Second * 30,
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2020-08-06 06:31:36 +00:00
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bufferPool: bufferpool.NewPool(32 * 1024),
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}
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for _, opt := range opts {
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opt(c)
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}
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return c, nil
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}
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2020-08-06 07:06:33 +00:00
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// Close closes the connection.
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2020-08-06 06:31:36 +00:00
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func (sf *Client) Close() (err error) {
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err = sf.tcpConn.Close()
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2020-08-06 07:06:33 +00:00
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if sf.Conn != nil {
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err = sf.Conn.Close()
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2020-08-06 06:31:36 +00:00
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}
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return
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}
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2020-08-06 07:06:33 +00:00
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// Dial connects to the address on the named network through proxy , with socks5 handshake.
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2020-08-06 06:31:36 +00:00
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func (sf *Client) Dial(network, addr string) (net.Conn, error) {
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if network == "tcp" {
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return sf.DialTCP(network, addr)
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}
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if network == "udp" {
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return sf.DialUDP(network, nil, addr)
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}
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return nil, errors.New("not support network")
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}
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2020-08-06 07:06:33 +00:00
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// DialTCP connects to the address on the named network through proxy , with socks5 handshake.
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2020-08-06 06:35:01 +00:00
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func (sf *Client) DialTCP(network, addr string) (net.Conn, error) {
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2020-08-06 06:31:36 +00:00
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conn := *sf // clone a client
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2020-08-06 07:06:33 +00:00
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remoteAddress, err := net.ResolveTCPAddr(network, addr)
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2020-08-06 06:31:36 +00:00
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if err != nil {
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return nil, err
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}
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err = conn.dialProxyServer(network)
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if err != nil {
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return nil, err
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}
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if _, err := conn.handshake(statute.CommandConnect, addr); err != nil {
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conn.Close()
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return nil, err
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}
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2020-08-06 07:06:33 +00:00
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conn.Conn = &underConnect{
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conn.tcpConn,
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remoteAddress,
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}
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2020-08-06 06:31:36 +00:00
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return &Connect{&conn}, nil
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}
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2020-08-06 07:06:33 +00:00
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// DialUDP connects to the address on the named network through proxy , with socks5 handshake.
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2020-08-06 06:35:01 +00:00
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func (sf *Client) DialUDP(network string, laddr *net.UDPAddr, raddr string) (net.Conn, error) {
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2020-08-06 06:31:36 +00:00
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conn := *sf // clone a client
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remoteAddress, err := net.ResolveUDPAddr(network, raddr)
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if err != nil {
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return nil, err
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}
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err = conn.dialProxyServer("tcp")
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if err != nil {
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return nil, err
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}
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bndAddress, err := conn.handshake(statute.CommandAssociate, raddr)
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if err != nil {
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return nil, err
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}
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ra, err := net.ResolveUDPAddr(network, bndAddress)
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if err != nil {
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conn.Close()
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return nil, err
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}
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if laddr == nil {
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laddr = &net.UDPAddr{
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IP: conn.tcpConn.LocalAddr().(*net.TCPAddr).IP,
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Port: conn.tcpConn.LocalAddr().(*net.TCPAddr).Port,
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Zone: conn.tcpConn.LocalAddr().(*net.TCPAddr).Zone,
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}
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}
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udpConn, err := net.DialUDP(network, laddr, ra)
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if err != nil {
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conn.Close()
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return nil, err
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}
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2020-08-06 07:06:33 +00:00
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conn.Conn = &underAssociate{
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2020-08-06 06:31:36 +00:00
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udpConn,
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conn.bufferPool,
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remoteAddress,
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}
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return &Associate{&conn}, nil
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}
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func (sf *Client) handshake(command byte, addr string) (string, error) {
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methods := statute.MethodNoAuth
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if sf.auth != nil {
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methods = statute.MethodUserPassAuth
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}
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_, err := sf.tcpConn.Write(statute.NewMethodRequest(statute.VersionSocks5, []byte{methods}).Bytes())
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if err != nil {
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return "", err
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}
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reply, err := statute.ParseMethodReply(sf.tcpConn)
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if err != nil {
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return "", err
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}
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if reply.Ver != statute.VersionSocks5 {
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return "", statute.ErrNotSupportVersion
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}
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if reply.Method != methods {
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return "", statute.ErrNotSupportMethod
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}
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if methods == statute.MethodUserPassAuth {
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_, err = sf.tcpConn.Write(statute.NewUserPassRequest(statute.UserPassAuthVersion, []byte(sf.auth.User), []byte(sf.auth.Password)).Bytes())
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if err != nil {
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return "", err
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}
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rsp, err := statute.ParseUserPassReply(sf.tcpConn)
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if err != nil {
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return "", err
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}
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if rsp.Ver != statute.UserPassAuthVersion {
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return "", statute.ErrNotSupportMethod
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}
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if rsp.Status != statute.RepSuccess {
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return "", statute.ErrUserAuthFailed
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}
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}
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a, err := statute.ParseAddrSpec(addr)
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if err != nil {
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return "", err
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}
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reqHead := statute.Request{
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Version: statute.VersionSocks5,
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Command: command,
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DstAddress: a,
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}
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if _, err := sf.tcpConn.Write(reqHead.Bytes()); err != nil {
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return "", err
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}
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rspHead, err := statute.ParseReply(sf.tcpConn)
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if err != nil {
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return "", err
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}
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if rspHead.Response != statute.RepSuccess {
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return "", errors.New("host unreachable")
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}
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return rspHead.BndAddress.String(), nil
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}
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func (sf *Client) dialProxyServer(network string) error {
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conn, err := net.Dial(network, sf.proxyAddr)
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if err != nil {
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return err
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}
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sf.tcpConn = conn.(*net.TCPConn)
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2020-08-06 07:06:33 +00:00
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if sf.keepAlivePeriod != 0 {
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err = sf.tcpConn.SetKeepAlivePeriod(sf.keepAlivePeriod)
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2020-08-06 06:31:36 +00:00
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}
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if err != nil {
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sf.tcpConn.Close()
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return err
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}
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return nil
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}
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