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c - 使用 c 的代理隧道

转载 作者:太空宇宙 更新时间:2023-11-04 07:30:31 25 4
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我正在做一个小项目(C 编程)来通过代理进行隧道传输,当我尝试这样做时出现错误:

HTTP/1.0 400 Bad Request
Server: squid/2.7.STABLE9
Date: Mon, 07 Jan 2013 22:20:56 GMT
Content-Type: text/html
Content-Length: 1456
X-Squid-Error: ERR_INVALID_REQ 0
X-Cache: MISS from xt03
Via: 1.0 xt03:80 (squid/2.7.STABLE9)
Connection: close

我发送到代理服务器的数据是:

 char msg[] = "CONNECT example.com:80 HTTP/1.0 <CR><LF> HOST example.com:80 <CR><LF> \n";

任何帮助都会很棒!

------ 更新 ------

我已经尝试了你们建议的方法,但我仍然遇到错误。我将发布我的整个代码集,看看它是否是套接字中的某些东西导致它发送错误信息。

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <netinet/in.h>

#define maxlen 2048

int main(int argc, char *argv[])
{
int mysocket;
int len;
char buffer[2000];
char msg[] = "CONNECT example.org:80 HTTP/1.0 \r\n HOST example.org:80 \r\n\r\n";


mysocket = socket(AF_INET, SOCK_STREAM, 0);

struct sockaddr_in dest;

memset(&dest, 0, sizeof(dest));

dest.sin_family = AF_INET;
dest.sin_addr.s_addr = inet_addr("125.39.66.150");
dest.sin_port = htons(80);

connect(mysocket, (struct sockaddr *)&dest, sizeof(struct sockaddr));

send(mysocket, msg, strlen(msg), 0);
len = recv(mysocket, buffer, maxlen, 0);

buffer[len] = '\0';

printf("%s \n", buffer);
close(mysocket);
return 0;

----- 更新 ------

新错误:

HTTP/1.0 400 Bad Request
Server: squid/2.7.STABLE5
Date: Tue, 08 Jan 2013 22:40:24 GMT
Content-Type: text/html
Content-Length: 1158
X-Squid-Error: ERR_INVALID_REQ 0
X-Cache: MISS from DXT-BJ-219
X-Cache-Lookup: NONE from DXT-BJ-219:80
Connection: close

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<HTML><HEAD><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<TITLE>ERROR: The requested URL could not be retrieved</TITLE>
<STYLE type="text/css"><!--BODY{background-color:#ffffff;font-family:verdana,sans- serif}PRE{font-family:sans-serif}--></STYLE>
</HEAD><BODY>
<H1>ERROR</H1>
<H2>The requested URL could not be retrieved</H2>
<HR noshade size="1px">
<P>
While trying to process the request:
<PRE>
CONNECT example.com:80 HTTP/1.1


</PRE>
<P>
The following error was encountered:
<UL>
<LI>
<STRONG>
Invalid Request
</STRONG>
</UL>

<P>
Some aspect of the HTTP Request is invalid. Possible problems:
<UL>
<LI>Missing or unknown request method
<LI>Missing URL
<LI>Missing HTTP Identifier (HTTP/1.0)
<LI>Request is too large
<LI>Content-Length missing for POST or PUT requests
<LI>Illegal character in hostname; underscores are not allowed
</UL>
<P>Your cache administrator is <A HREF="mailto:noc_admin@163.com">noc_admin@163.com</A>.

<BR clear="all">
<HR noshade size="1px">
<ADDRESS>
by DXT-BJ-219
</ADDRESS>
</BODY></HTML>

最佳答案

“错误请求”是指您发送到服务器的请求格式错误且无法理解。我认为这是因为您要发送 8 个字符 <CR><LF> (如 '<'、'C'、'R' 等)而不是它们应该代表的 2 个字符,即 \r\n .

尝试

char msg[] = "CONNECT example.com:80 HTTP/1.0\r\nHOST example:80\r\n\r\n";

关于c - 使用 c 的代理隧道,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14208984/

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