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#include "stdafx.h"
#define  _WINSOCK_DEPRECATED_NO_WARNINGS
#include <stdio.h> 
#include <winsock2.h> 
#define  MAXBUFLEN  20480 
#define  HTTPADDLEN 50 
#define  TIMEWAIT   2000 
#pragma comment(lib,"ws2_32.lib")
SOCKET   Global[1000];
//#define _CRT_NONSTDC_NO_WARNINGS


DWORD WINAPI  Proxy(LPVOID pSocket);
int   ParseHttpRequest(char * SourceBuf, int DataLen, void * ServerAddr);
int main(int argc, char * argv[])
{
SOCKET  MainSocket, ClientSocket;
struct  sockaddr_in Host, Client;
WSADATA WsaData;
int  AddLen, i;
//初始化 
if (WSAStartup(MAKEWORD(2, 2), &WsaData) < 0)
{
printf("初始化失败\n");
return 1;
}
//创建socket端口 
MainSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (MainSocket == SOCKET_ERROR)
{
printf("端口创建错误\n");
return 1;
}
Host.sin_family = AF_INET;
Host.sin_port = htons(27015);
Host.sin_addr.s_addr = inet_addr("127.0.0.1");
printf("正在工作\n");
//绑定socket
if (bind(MainSocket, (SOCKADDR *)&Host, sizeof(Host)) != 0)
{
printf("绑定错误\n");
}
i = 0;
//监听 
if (listen(MainSocket, 5) == SOCKET_ERROR)
{
printf("监听错误\n");
}
AddLen = sizeof(Client);
//连接新的客户 
i = 0;
for (;;)
{
ClientSocket = accept(MainSocket, (SOCKADDR *)&Client, &AddLen);
if (ClientSocket == SOCKET_ERROR)
{
printf("接受客户请求错误!\n");
}
printf(".");
i++;
if (i >= 1000)
i = 0;
Global[i] = ClientSocket;
//对于每一个客户启动不同的线程程进行控制 
//这个地方在使用ClientSocket的时候，要不要保证在某一时刻内只能有一个进程使用？     
CreateThread(NULL, 0, Proxy, (LPVOID)Global[i], 0, NULL);
}
return 0;
}
DWORD WINAPI Proxy(LPVOID pSocket)
{
SOCKET ClientSocket;
char  ReceiveBuf[MAXBUFLEN];
int  DataLen;
struct sockaddr_in  ServerAddr;
SOCKET  ProxySocket;
int i = 0;
int time = TIMEWAIT;
//得到参数中的端口号信息 
ClientSocket = (SOCKET)pSocket;
//接受第一次请求信息 
memset(ReceiveBuf, 0, MAXBUFLEN);
DataLen = recv(ClientSocket, ReceiveBuf, MAXBUFLEN, 0);
if (DataLen == SOCKET_ERROR)
{
printf("错误\n");
closesocket(ClientSocket);
return 0;
}
if (DataLen == 0)
{
closesocket(ClientSocket);
return 0;
}
//处理请求信息，分离出服务器地址 
if (ParseHttpRequest(ReceiveBuf, DataLen, (void *)&ServerAddr) < 0)
{
closesocket(ClientSocket);
goto error;
}
//创建新的socket用来和服务器进行连接 
ProxySocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
//设置超时时间 
setsockopt(ProxySocket, SOL_SOCKET, SO_RCVTIMEO, (char *)&time, sizeof(time));
if (ProxySocket == SOCKET_ERROR)
{
printf("端口创建错误\n");
return 0;
}
if (connect(ProxySocket, (SOCKADDR *)&ServerAddr, sizeof(ServerAddr)) == SOCKET_ERROR)
{
//printf("连接服务器错误"); 
goto error;
}
//开始进行数据传输处理 
//发送到服务器端 
if (send(ProxySocket, ReceiveBuf, DataLen, 0) == SOCKET_ERROR)
{
//printf("数据发送错误"); 
goto error;
}
//从服务器端接受数据 
while (DataLen > 0)
{
memset(ReceiveBuf, 0, MAXBUFLEN);
if ((DataLen = recv(ProxySocket, ReceiveBuf, MAXBUFLEN, 0)) <= 0)
{
//    printf("数据接受错误"); 
break;
}
else
//发送到客户端 
if (send(ClientSocket, ReceiveBuf, DataLen, 0) < 0)
{
//    printf("数据发送错误"); 
break;
}
}
error:
closesocket(ClientSocket);
closesocket(ProxySocket);
return 0;
}
int  ParseHttpRequest(char * SourceBuf, int DataLen, void * ServerAddr)
{
char * HttpHead = "http://";
char * FirstLocation = NULL;
char * LastLocation = NULL;
char * PortLocation = NULL;
char  ServerName[HTTPADDLEN];
char  PortString[10];
int   NameLen;
struct hostent * pHost;
struct sockaddr_in * pServer = (struct sockaddr_in *)ServerAddr;
//取得http://的位置 
FirstLocation = strstr(SourceBuf, HttpHead) + strlen(HttpHead);
//取得/的位置 
printf("%s\n", FirstLocation);
LastLocation = strstr(FirstLocation, "/");
//得到http://和/之间的服务器的名称 
memset(ServerName, 0, HTTPADDLEN);
memcpy(ServerName, FirstLocation, LastLocation - FirstLocation);


//有些情况下，请求的地址中带有端口号格式为“：+ 端口号”； 
//取得 ：的位置 
PortLocation = strstr(ServerName, ":");
//填充server结构 
pServer->sin_family = AF_INET;
//在url中制定了服务器端口 
if (PortLocation != NULL)
{
NameLen = PortLocation - ServerName - 1;
memset(PortString, 0, 10);
memcpy(PortString, PortLocation + 1, NameLen);
pServer->sin_port = htons((u_short)atoi(PortString));
*PortLocation = 0;
}
else//在url中，没有制定服务器端口 
{
pServer->sin_port = htons(80);
}
if (NameLen > HTTPADDLEN)
{
printf("服务器名字太长\n");
return -1;
}
//得到服务器信息 
//如果地址信息是以IP地址(192.168.0.1)的形式出现的 
if (ServerName[0] >= '0' && ServerName[0] <= '9')
{
pServer->sin_addr.s_addr = inet_addr(ServerName);
}
//以域名的形式出现的(www.sina.com.cn) 
else
{
pHost = (struct hostent *)gethostbyname(ServerName);
if (!pHost)
{
printf("取得主机信息错误\n");
printf("%s\n", ServerName);
return -1;
}
memcpy(&pServer->sin_addr, pHost->h_addr_list[0], sizeof(pServer->sin_addr));
}
return 0;
}