VB6中使用Winsock穿越各种代理的实现

　　然后服务器返回两个字节的信息,第一个字节固定,第而个字节是说明,如果是16进制的FF(即十进制255)表示连接失败(o X'FF' NO ACCEPTABLE METHODS)根据上面的列表,我们连接成功应该第二字节为 00.

　　然后我们进入第二步,请看以下RFC说明:

　　Once the method-dependent subnegotiation has completed, the client

　　sends the request details. If the negotiated method includes

　　encapsulation for purposes of integrity checking and/or

　　confidentiality, these requests MUST be encapsulated in the method-

　　dependent encapsulation.

　　The SOCKS request is formed as follows:

　　+----+-----+-------+------+----------+----------+

　　|VER | CMD | RSV | ATYP | DST.ADDR | DST.PORT |

　　+----+-----+-------+------+----------+----------+

　　| 1 | 1 | X'00' | 1 | Variable | 2 |

　　+----+-----+-------+------+----------+----------+

　　Where:

　　o VER protocol version: X'05' ------------- 固定 05

　　o CMD

　　o CONNECT X'01' ------------- TCP方式 01

　　o BIND X'02'

　　o UDP ASSOCIATE X'03' ------------- UDP方式 03

　　o RSV RESERVED ------------- 固定 00

　　o ATYP address type of following address

　　o IP V4 address: X'01' ------------- IPv4 01

　　o DOMAINNAME: X'03'

　　o IP V6 address: X'04'

　　o DST.ADDR desired destination address

　　o DST.PORT desired destination port in network octet

　　order

　　The SOCKS server will typically evaluate the request based on source

　　and destination addresses, and return one or more reply messages, as

　　appropriate for the request type.

　　发送 05 01 00 01 + 目的地址(4字节) + 目的端口(2字节)，目的地址和端口都是16进制码(不是字符串)。

　　例202.103.190.27 - 7201

　　则发送的信息为：05 01 00 01 CA 67 BE 1B 1C 21

　　(CA=202 67=103 BE=190 1B=27 1C21=7201)