# Functions
AuthPswd 基础的用户名密码校验.
DefaultAuthChecker 缺省身份校验（无校验）.
DefaultRequester 执行net.Dial创建连接，并将两个net.Conn进行连接.
NewServer 创建新的socks5协议服务端.
NoAuth 直接连接的方式.
NoAuthChecker 无校验.
PswdAuthChecker 用户名密码校验.
# Constants
BindCommand ...
ConnectCommand ...
Domain RFC1928/ATYP/DOMAINNAME: X'03'.
IPv4 RFC1928/ATYP/IP_V4_address: X'01'.
IPv6 RFC1928/ATYP/IP_V6_address: X'04'.
MethodAuthPswd ...
MethodGssapi ...
MethodNoAcceptable ...
MethodNoAuth ...
UDPCommand ...
VersionSocks5 协议版本号.
# Variables
ErrAddressBufTooLong ...
ErrAddressTypeNotSupport ...
ErrAuthPswdFailed 错误：校验用户名密码失败.
ErrMethodsIsEmpty ...
ErrMethodsNotSupport ...
ErrMethodsSizeIllegal ...
ErrReplyAtypeNotSupported ...
ErrReplyCmdNotSupported ...
ErrReplyConnectionNotAllow ...
ErrReplyConnectionRefused ...
ErrReplyFailure ...
ErrReplyHostUnreachable ...
ErrReplyNetworkUnRereachable ...
ErrReplyTTLExpired ...
ErrVersionNotSupport ...
# Interfaces
Auth 认证接口.
AuthChecker 进行身份校验的状态机.
Request 客户端请求的数据上下文.
Server Socks5服务.