socks5协议转http协议源码
作者：无双 来源：http://www.loveunix.net/
socks5代理可以看rfc 1928
socks5的用户名口令认证方法看rfc 1929http代理可以看 rfc2616
socks5代理可以支持tcp和udp 而http只支持tcp所以这个代理转换器只支持tcp
写作原因
很多软件都有socks5认证方法 但是它们不支持http认证方法
而从原理上可以使用http认证方法(因为它们没有使用udp)
所以写这个软件可以方便的使其它程序可以使用http代理如联众 或是foxmail
CODE
#include <winsock2.h>
#include <stdio.h>
#include <stdlib.h>
#define INIT_SOCKET(){WSADATA wsadata;WSAStartup(MAKEWORD(2,2),&wsadata);}
#define CLOSESOCKET(x) closesocket(x)
#define CLEAN_SOCKET() {WSACleanup();}
// http.c 实现http代理功能#define PROTO_EXCHANGE_TIMEOUT 15
#define PROTO_RECVRESP_TIMEOUT 75
#define PROTO_SENDRESP_TIMEOUT 10#define WAIT_AND_RECV(sd,buf,len,waittime,recvflags) do{
struct fd_set sset;
struct timeval waited;
waited.tv_sec = waittime;waited.tv_usec = 0;
FD_ZERO(&sset);FD_SET(sd,&sset);
if(select(sd+1,&sset,NULL,NULL,&waited) != 1 || (len = recv(sd,buf,len,recvflags)) == -1 )
len = -1;
}while(0);#define DEBUG_DUMP printf
static int httpproxy_connect(const char*proxyaddr,int proxyport,
const char*dstaddr,int dstport)
{
int proxysd = -1;
char buf[2048];
int len;
char *ptoken;
int status;struct sockaddr_in inaddr;
if( !proxyaddr || !proxyaddr[0] || proxyport < 1
||!dstaddr || !dstaddr[0] )
return -1;DEBUG_DUMP("代理:%s:%d,目标:%s:%d ",proxyaddr,proxyport,dstaddr,dstport);
len = sizeof(inaddr);
memset(&inaddr,0,len);
if( (inaddr.sin_addr.s_addr = inet_addr(proxyaddr) ) == INADDR_NONE )
return -1;inaddr.sin_family = AF_INET;
inaddr.sin_port = htons(proxyport);// connect to proxy
if((proxysd = socket(AF_INET,SOCK_STREAM,0)) == -1 )
return -1;
if( connect(proxysd,(struct sockaddr*)&inaddr,len))
goto errorparse;// 发送connect请求并判断返回,根据HTTP协议说明,详细内容请看RFC2616
// HTTP代理使用CONNECT指令实现，CONNECT时指定选端的地址与端口号,
// 当代理服务器返回成功后(状态值是2xx),后面的代理服务器不再对此连接的数据
// 进行HTTP协议处理
if( dstport > 0 )
len = sprintf(buf,"CONNECT %s:%d HTTP/1.1 ",dstaddr,dstport);
else
len = sprintf(buf,"CONNECT %s HTTP/1.1 ",dstaddr);if( send(proxysd,buf,len,0) != len ){
DEBUG_DUMP("发送CONNECT请求失败:包内容:%s ",buf);
goto errorparse;
}len = sizeof(buf)-1;
WAIT_AND_RECV(proxysd,buf,len,PROTO_RECVRESP_TIMEOUT,MSG_PEEK);
if( len == -1){
DEBUG_DUMP("接收CONNECT响应失败 ");
goto errorparse;
}buf[len] = 0;
DEBUG_DUMP("CONNECT响应为:%s| ",buf);
if( strnicmp(buf,"HTTP/1.",7)
|| (!strstr(buf," ") && !strstr(buf," ")))
goto errorparse;ptoken = buf;
while(!isspace(*ptoken) && *ptoken) ptoken ++;
status = atoi(ptoken);
if( status < 300 && status > 199 ){
ptoken = strstr(buf," ");
if( ptoken )
len = ptoken - buf +4;
else{
ptoken = strstr(buf," ");
len = ptoken - buf +2;
}
WAIT_AND_RECV(proxysd,buf,len,PROTO_RECVRESP_TIMEOUT,0);
return proxysd;
}errorparse:
CLOSESOCKET(proxysd);
return -1;
}// sd [in] 使用socks5的客户端的连接id
// proxyaddr [in] http代理地址
// proxyport [in] http代理端口
// return:
// -1 失败
// >=0 与http代理的连接id
static int socks5_accept(int sd,const char *proxyaddr,int proxyport)
{
unsigned char buf[512];
int len = 2;
int i = 0;
char dstaddr[260];
int dstport;if( !proxyaddr || !proxyaddr[0] || proxyport <1 )
return -1;// 处理协商,现在只处理无认证情况,无论对方会不会处理这种情况
// 没有要求无认证方式,sorry,那我就不理它
// 另外只处理SOCKS5的CONNECT命令,其它不处理
WAIT_AND_RECV(sd,(char*)buf,len,PROTO_EXCHANGE_TIMEOUT,0);
if( len != 2 || buf[0] != 5 ){
DEBUG_DUMP("接收socks5协商包失败,len:%d,buf[0]:%d ",len,buf[0]);
return -1;
}
len = buf[1];
i = len;
WAIT_AND_RECV(sd,(char*)buf,i,PROTO_EXCHANGE_TIMEOUT,0);
if( len != i ){
DEBUG_DUMP("接收socks5协商包失败,想接收%d,收到:%d ",len,i);
return -1;
}for( i = 0;i< len && buf[i];i++ );
if( i == l
补充：综合编程 , 安全编程 ,
