main.cpp

some code from Internet

/*
 * socksapp - 通过SOCKS代理向pop.mail.yahoo.com这个服务器发送一个用户登录请求，并取得
 * 该POP3服务器的响应。该程序演示了如何使得自己的网络程序通透过SOCKS防火墙而向远程服务
 * 器通信。
 * 要求运行socksapp的主机的DNS设置能解释得通pop.mail.yahoo.com这个服务器地址。
 * 128.11.68.63 - 要不，你就直接使用这个IP地址，这是我PING出来的IP。
 */

//作者：冬雪
//2001-1-31

#ifdef WIN32
#include <winsock2.h>
#endif

#include <stdio.h>
#include "ssocks.h"
#include "sdns.h"


#define SOCKS_PROXY	"192.168.100.2"
#define SOCKS_PROXY_PORT 1080

#define TARGET_POP3SERVER "128.11.68.63"	//POP.MAIL.YAHOO.COM

int Usage(char** argv)
{
	printf("$@ Usage:\n\
%s socksproxyip socksproxyport pop3server youraccount yourpassword\n\
socksproxyip	- socks proxy 's ip address\n\
socksproxyport	- socks proxy's port,1080 default\n\
pop3server		- pop3 server \n\
youraccount		- Your account on that pop3server\n\
yourpassword	- Your password of that account \n",
argv[0]);

	return TRUE;
}
int main(int argc, char* argv[])
{

	//0.初始化SOCKET

	printf("* SocksApp ver 1.0 \n* Powered by Billy.([e-mail])\n\n");

	if(argc<6)
	{
		Usage(argv);
		return 0;
	}

#ifdef WIN32
	WSADATA wsaData;
	if (WSAStartup(0x0101, &wsaData))
	{
		printf("Error:socket init failed!\n");
		return FALSE;
	}
#endif


	//1.创建客户端SOCKET
	int clisock=socket(AF_INET,SOCK_STREAM,0);
	if(clisock==INVALID_SOCKET)
	{
		printf("Create socket failed!\n");
		return FALSE;
	}
	
	//2.向SOCK5服务器连接
	struct sockaddr_in saproxy;
	
	memset(&saproxy, 0, sizeof(saproxy));
	saproxy.sin_family = AF_INET;
	saproxy.sin_addr.s_addr = inet_addr(argv[1]);//这是我的SOCKS服务器
	saproxy.sin_port = htons(atoi(argv[2]));	
	
	if(connect(clisock, (struct sockaddr*)&saproxy, sizeof(struct sockaddr)) != 0)
	{
		printf("Connect to socks proxy: %s port %d failed!\n",SOCKS_PROXY,SOCKS_PROXY_PORT);
		return FALSE;
	}
	else
	{
		printf("* Connect to socks proxy: %s port %d success!\n",SOCKS_PROXY,SOCKS_PROXY_PORT);
	
	}
	
	//3.向SOCK5服务器认证
	//源文：
	/*
	The client connects to the server, and sends a version
	identifier/method selection message:
	
	  +----+----------+----------+
	  |VER | NMETHODS | METHODS  |
	  +----+----------+----------+
	  | 1  |    1     | 1 to 255 |
	  +----+----------+----------+
	  
		The VER field is set to X'05' for this version of the protocol.  The
		NMETHODS field contains the number of method identifier octets that
		appear in the METHODS field.
	*/
	
	CSSocks socks;

	if(!socks.Auth(clisock,AUTH_NO))	//用于SOCK5服务器不需要认证的情况！
	{
		printf("Auth failed!\n");
		return FALSE;
	}
	
	//4.与真正的服务器建立连接
	struct sockaddr_in tarsocksrv;
	memset(&tarsocksrv,0,sizeof(tarsocksrv));
	//tarsocksrv.sin_addr.s_addr =  inet_addr(argv[3]);
	CSDns dns;
	tarsocksrv.sin_addr =  dns.GetIpByHost(argv[3]);
	tarsocksrv.sin_port = htons(110);
	tarsocksrv.sin_family = AF_INET;
	if(!socks.Connect(clisock,tarsocksrv))//yahoo.
	{
		printf("Connect to yahoo pop3 server failed!\n");

		return FALSE;
	}
	else
	{
		printf("* Connect to pop3 server %s : %d success!\n",
			TARGET_POP3SERVER,110);
	}
	
	//到此，便使原来的程序支持SOCKS代理！
	//下面你就可以利用clisock与pop.mail.yahoo.com 进行通信了！
	
	//比如：进行POP3用户名协商

	char szRecv[128];
	memset(szRecv,0,128);
	recv(clisock,szRecv,127,0);
	
	
	printf("* WELCOME <== %s\n",szRecv);

	char szPopProto[128];
	memset(szPopProto,0,128);
	sprintf(szPopProto,"USER %s\r\n",argv[4]);
	int nSend=send(clisock,szPopProto,strlen(szPopProto),0);

	printf("* COMMAND ==>: %s\n",szPopProto);
	
	//char szRecv[128];
	memset(szRecv,0,128);
	recv(clisock,szRecv,127,0);	
	printf("* RESPONSE <== %s",szRecv);
	
	memset(szPopProto,0,128);
	sprintf(szPopProto,"PASS %s\r\n",argv[5]);
	nSend=send(clisock,szPopProto,strlen(szPopProto),0);
	printf("* COMMAND ==>: %s\n",szPopProto);

	memset(szRecv,0,128);
	recv(clisock,szRecv,127,0);
	printf("* RESPONSE <== %s",szRecv);
	
	closesocket(clisock);
	shutdown(clisock,SD_BOTH);
	return 0;
}