You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: client.go
    path of file: ./repos/sealer/vendor/golang.org/x/net/internal/socks
    
    the code of the file until where you have to start completion: // Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package socks

import (
	"context"
	"errors"
	"io"
	"net"
	"strconv"
	"time"
)

var (
	noDeadline   = time.Time{}
	aLongTimeAgo = time.Unix(1, 0)
)

func (d *Dialer) connect(ctx context.Context, c net.Conn, address string) (_ net.Addr, ctxErr error) {
	host, port, err := splitHostPort(address)
	if err != nil {
		return nil, err
	}
	if deadline, ok := ctx.Deadline(); ok && !deadline.IsZero() {
		c.SetDeadline(deadline)
		defer c.SetDeadline(noDeadline)
	}
	if ctx 
    
func (d *Dialer) connect(ctx context.Context, c net.Conn, address string) (_ net.Addr, ctxErr error) {
	host, port, err := splitHostPort(address)
	if err != nil {
		return nil, err
	}
	if deadline, ok := ctx.Deadline(); ok && !deadline.IsZero() {
		c.SetDeadline(deadline)
		defer c.SetDeadline(noDeadline)
	}
	if ctx != context.Background() {
		errCh := make(chan error, 1)
		done := make(chan struct{})
		defer func() {
			close(done)
			if ctxErr == nil {
				ctxErr = <-errCh
			}
		}()
		go func() {
			select {
			case <-ctx.Done():
				c.SetDeadline(aLongTimeAgo)
				errCh <- ctx.Err()
			case <-done:
				errCh <- nil
			}
		}()
	}

	b := make([]byte, 0, 6+len(host)) // the size here is just an estimate
	b = append(b, Version5)
	if len(d.AuthMethods) == 0 || d.Authenticate == nil {
		b = append(b, 1, byte(AuthMethodNotRequired))
	} else {
		ams := d.AuthMethods
		if len(ams) > 255 {
			return nil, errors.New("too many authentication methods")
		}
		b = append(b, byte(len(ams)))
		for _, am := range ams {
			b = append(b, byte(am))
		}
	}
	if _, ctxErr = c.Write(b); ctxErr != nil {
		return
	}

	if _, ctxErr = io.ReadFull(c, b[:2]); ctxErr != nil {
		return
	}
	if b[0] != Version5 {
		return nil, errors.New("unexpected protocol version " + strconv.Itoa(int(b[0])))
	}
	am := AuthMethod(b[1])
	if am == AuthMethodNoAcceptableMethods {
		return nil, errors.New("no acceptable authentication methods")
	}
	if d.Authenticate != nil {
		if ctxErr = d.Authenticate(ctx, c, am); ctxErr != nil {
			return
		}
	}

	b = b[:0]
	b = append(b, Version5, byte(d.cmd), 0)
	if ip := net.ParseIP(host); ip != nil {
		if ip4 := ip.To4(); ip4 != nil {
			b = append(b, AddrTypeIPv4)
			b = append(b, ip4...)
		} else if ip6 := ip.To16(); ip6 != nil {
			b = append(b, AddrTypeIPv6)
			b = append(b, ip6...)
		} else {
			return nil, errors.New("unknown address type")
		}
	} else {
		if len(host) > 255 {
			return nil, errors.New("FQDN too long")
		}
		b = append(b, AddrTypeFQDN)
		b = append(b, byte(len(host)))
		b = append(b, host...)
	}
	b = append(b, byte(port>>8), byte(port))
	if _, ctxErr = c.Write(b); ctxErr != nil {
		return
	}

	if _, ctxErr = io.ReadFull(c, b[:4]); ctxErr != nil {
		return
	}
	if b[0] != Version5 {
		return nil, errors.New("unexpected protocol version " + strconv.Itoa(int(b[0])))
	}
	if cmdErr := Reply(b[1]); cmdErr != StatusSucceeded {
		return nil, errors.New("unknown error " + cmdErr.String())
	}
	if b[2] != 0 {
		return nil, errors.New("non-zero reserved field")
	}
	l := 2
	var a Addr
	switch b[3] {
	case AddrTypeIPv4:
		l += net.IPv4len
		a.IP = make(net.IP, net.IPv4len)
	case AddrTypeIPv6:
		l += net.IPv6len
		a.IP = make(net.IP, net.IPv6len)
	case AddrTypeFQDN:
		if _, err := io.ReadFull(c, b[:1]); err != nil {
			return nil, err
		}
		l += int(b[0])
	default:
		return nil, errors.New("unknown address type " + strconv.Itoa(int(b[3])))
	}
	if cap(b) < l {
		b = make([]byte, l)
	} else {
		b = b[:l]
	}
	if _, ctxErr = io.ReadFull(c, b); ctxErr != nil {
		return
	}
	if a.IP != nil {
		copy(a.IP, b)
	} else {
		a.Name = string(b[:len(b)-2])
	}
	a.Port = int(b[len(b)-2])<<8 | int(b[len(b)-1])
	return &a, nil
}