+----+----+----+----+----+----+----+----+
| VN | CD | DSTPORT | DSTIP |
+----+----+----+----+----+----+----+----+
1 1 2 4
VN is the version of the reply code and should be 0. CD is the result
code with one of the following values:
90: request granted -------------- 成功
91: request rejected or failed -------------- 失败
92: request rejected becasue SOCKS server cannot connect to
identd on the client
93: request rejected because the client program and identd
report different user-ids
The remaining fields are ignored.
根据RFC的说法,代理服务器返回8字节的数据,我们只要判断第二字节是否为90即可,若是90连接成功,否则失败.剩下的操作和直连一样,Winsock可直接用SendData 和 GetData 发送\接受数据.
HTTP1.1 代理的穿透
由于RFC 2616过于冗长,加上HTTP代理穿透的步骤比socks简单,这里就不详细说明了,我只给出连接的步骤和发送数据格式.
第一步仍然是用Winsock去连接代理服务器.第二步为发送请求字符,其格式为:
无用户名/密码校验 格式:
"CONNECT" + 空格 + 目标连接地址 + ":" + 目标连接端口 + 空格 + "HTTP/1.1" + Chr(13) + Chr(10) + "Host:" + 空格 + 目标连接地址 + ":" + 目标连接端口 + Chr(13) + Chr(10) + Chr(13) + Chr(10)
用户名/密码验证格式:
"CONNECT" + 空格 + 目标连接地址 + ":" + 目标连接端口 + 空格 + "HTTP/1.1" + Chr(13) + Chr(10) + "Host:" + 空格 + 目标连接地址 + ":" + 目标连接端口 + Chr(13) + Chr(10) + "Authorization: Basic" + 空格 + 经Base64加密过后的[用户名:密码] + Chr(13) + Chr(10) + Chr(13) + Chr(10) + "Proxy-Authorization: Basic" + 空格 + 经Base64加密过后的[用户名:密码] + Chr(13) + Chr(10) + Chr(13) + Chr(10)
发送请求完毕后,将收到代理的回应,根据RFC说明(注意 Status-Line 和 Status-Code):
6 Response
After receiving and interpreting a request message, a server responds
with an HTTP response message.
Response = Status-Line ; Section 6.1
*(( general-header ; Section 4.5
| response-header ; Section 6.2
| entity-header ) CRLF) ; Section 7.1
CRLF
[ message-body ] ; Section 7.2
