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用VC++实现http代理


　　（1）一些基本变量

SOCKET HTTPSocket; // 主socket
struct sockaddr_in SocketAddr; // address socket
struct sockaddr_in BindSocket; // for bind


int m_nRecvTimeout; // recieve timeout
int m_nSendTimeout; // send timeout

WSADATA wsaData;

// 要下载文件部分。好像在BindSocket.sin_addr.s_addr = inet_addr (strHost);时，只能使用ip地址，所以了。。。

// 如果谁知道更好的方法，别忘了告诉我一下。

CString strHost="111.111.111.111 ";
CString DownLoadAddress="http://www.aitenshi.com/bbs/images/";
CString hostFile="logo.gif";
int HttpPort=80;



　　（2）一些函数，用来取得http头，和获取文件大小

int GetFileLength(char *httpHeader)
{
CString strHeader;
int local;
strHeader=(CString)httpHeader;
local=strHeader.Find("Content-Length",0);
local+=16;
strHeader.Delete(0,local);
local=strHeader.Find("\r");
strHeader.SetAt(local,'\0');

char temp[30];
strcpy(temp,strHeader.GetBuffer(strHeader.GetLength()));
return atoi(temp);
}

int GetHttpHeader(SOCKET sckDest,char *str)
{
BOOL m_bResponsed=0;
int m_nResponseHeaderSize;

if(!m_bResponsed)
{
char c = 0;
int nIndex = 0;
BOOL bEndResponse = FALSE;
while(!bEndResponse && nIndex < 1024)
{
recv(sckDest,&c,1,0);
str[nIndex++] = c;
if(nIndex >= 4)
{
if(str[nIndex - 4] == '\r' && str[nIndex - 3] == '\n'
&& str[nIndex - 2] == '\r' && str[nIndex - 1] == '\n')
bEndResponse = TRUE;
}
}
m_nResponseHeaderSize = nIndex;
m_bResponsed = TRUE;
}

return m_nResponseHeaderSize;

}


　　（3）用来发送的部分

void szcopy(char* dest,const char* src,int nMaxBytes)
{
int i_cntr=0;
while ((src[i_cntr]!='\0') 　　 (i_cntr dest[i_cntr]=src[i_cntr++];
dest[i_cntr]='\0';
}

BOOL SocketSend(SOCKET sckDest,const char* szHttp)
{

char szSendHeader[MAXHEADERLENGTH];
int iLen=strlen(szHttp);
szcopy(szSendHeader,szHttp,iLen);
if(send (sckDest ,(const char FAR *)szSendHeader ,iLen ,0)==SOCKET_ERROR)
{
closesocket(sckDest);
AfxMessageBox("Error when send");
return FALSE;
}

return TRUE;
}

BOOL SocketSend(SOCKET sckDest,CString szHttp)
{

int iLen=szHttp.GetLength();
if(send (sckDest,szHttp,iLen,0)==SOCKET_ERROR)
{
closesocket(sckDest);
AfxMessageBox("Error when send");
return FALSE;
}

return TRUE;
}


　　（4）用于连接的函数

　　这里是做了一些连接用的操作，分了两种情况

　　1）如果没有使用代理，则直接连到你指定的计算机

　　2）如果使用了代理，则直接连到代理

BOOL CDLAngelDlg::ConnectHttp()
{

message="正在建立连接\n";


UpdateData(TRUE);
if(m_combo=="HTTP") // m_combo 一个下拉条
{
HTTPSocket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
SocketAddr.sin_addr.s_addr = inet_addr (m_ProxyAddr);
SocketAddr.sin_family=AF_INET;
SocketAddr.sin_port=htons(atoi(m_Port));

struct fd_set fdSet;
struct timeval tmvTimeout={0L,0L};

FD_ZERO(&fdSet);
FD_SET(HTTPSocket, &fdSet);

if (select(0,&fdSet,NULL,NULL,&tmvTimeout)==SOCKET_ERROR)
{
closesocket(HTTPSocket);
AfxMessageBox("Error when select.");
return 0;
}


if (connect(HTTPSocket, (const struct sockaddr *)&SocketAddr, sizeof(SocketAddr))==SOCKET_ERROR)
{
message="\n代理连接失败\n";
m_message.CleanText();
m_message.AddText(message);
return 0;
}


// 发送CONNCET请求令到代理服务器，用于和代理建立连接

//代理服务器的地址和端口放在m_ProxyAddr,m_Port 里面

CString temp;
char tmpBuffer[1024];
temp.Format("CONNECT %s:%s HTTP/1.1\r\nUser-Agent: MyApp/0.1\r\n\r\n",m_ProxyAddr,m_Port);
if(!SocketSend(HTTPSocket,temp))
{
message="连接代理失败";
return 0;
}

// 取得代理响应，如果连接代理成功，代理服务器将返回200 Connection established

GetHttpHeader(HTTPSocket,tmpBuffer);
temp=tmpBuffer;
if(temp.Find("HTTP/1.0 200 Connection established",0)==-1)
{
message="连接代理失败\n";
return 0;
}

message="代理连接完成\n";
m_message.AddText("代理连接完成\n");
return 1; // ----------〉这里是应该注意的，连接到代理后，就可以返回了，不需要再连接网上的另外一台机，代理服务器会自动转发数据，所以，连接完代理就像连接到网上另外一台机一样
}

// 这个，是为了给其他代理做准备
else if(m_combo=="Socks4")
{MessageBox("请注意，现在无法使用代理功能！");}
else if(m_combo=="Socks5")
{MessageBox("请注意，现在无法使用代理功能！");}


// 如果没有使用代理，就要连接到网上的另一台机

// 准备socket
HTTPSocket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);

if (HTTPSocket==INVALID_SOCKET)
{
AfxMessageBox("Error when socket");
return 0;
}

//设置超时
struct linger zeroLinger;
zeroLinger.l_onoff = 1;
zeroLinger.l_linger = 0;
if(setsockopt(HTTPSocket,SOL_SOCKET,SO_LINGER
,(const char *)&zeroLinger
,sizeof(zeroLinger))!=0)
{
closesocket(HTTPSocket);
AfxMessageBox("Error when setscokopt(LINGER)");
return 0;
}
//设置接收超时
if(setsockopt(HTTPSocket,SOL_SOCKET,SO_RCVTIMEO
,(const char *)&m_nRecvTimeout
,sizeof(m_nRecvTimeout))!=0)
{
closesocket(HTTPSocket);
AfxMessageBox("Error when setsockopt(RCVTIME).");
return 0;
}

//设置发送超时
if(setsockopt(HTTPSocket,SOL_SOCKET,SO_SNDTIMEO
,(const char *)&m_nSendTimeout
,sizeof(m_nSendTimeout))!=0)
{
closesocket(HTTPSocket);
AfxMessageBox("Error when setsockopt(SNDTIMEO).");
return 0;
}


SocketAddr.sin_addr.s_addr = htonl (INADDR_ANY);
SocketAddr.sin_family=AF_INET;

// 进行端口绑定
if (bind (HTTPSocket,
(const struct sockaddr FAR *)&SocketAddr,
sizeof(SocketAddr))==SOCKET_ERROR)
{
closesocket(HTTPSocket);
AfxMessageBox("Error when bind socket.");
return 0;
}

//准备连接

/// 准备连接信息
BindSocket.sin_addr.s_addr = inet_addr (strHost);
BindSocket.sin_family=AF_INET;
BindSocket.sin_port=htons(HttpPort);


struct fd_set fdSet;
struct timeval tmvTimeout={0L,0L};

FD_ZERO(&fdSet);
FD_SET(HTTPSocket, &fdSet);

if (select(0,&fdSet,NULL,NULL,&tmvTimeout)==SOCKET_ERROR)
{
closesocket(HTTPSocket);
AfxMessageBox("Error when select.");
return 0;
}

// 连接


if (connect(HTTPSocket, (const struct sockaddr *)&BindSocket, sizeof(BindSocket))==SOCKET_ERROR)
{
AfxMessageBox("第一次连接失败，准备第二次连接");
if (connect(HTTPSocket
,(const struct sockaddr *)&BindSocket
,sizeof(BindSocket))==SOCKET_ERROR)
{
closesocket(HTTPSocket);
AfxMessageBox("连接失败");
return 0;
}

}

message="连接完成\n";

return 1;
}


　　（5）发送http请求，为下载数据进行准备

int CDLAngelDlg::SendHttpHeader()
{
//进行下载

CString temp;
BOOL bReturn;
char tmpBuffer[MAXBLOCKSIZE];


///第1行:方法,请求的路径,版本
temp="GET "+DownLoadAddress+hostFile+" HTTP/1.0\r\n";
bReturn=SocketSend(HTTPSocket,temp);
if(!bReturn)
{
message="发送请求失败";
return 0;
}


///第2行:主机
temp="Host "+strHost+"\r\n";
bReturn=SocketSend(HTTPSocket,temp);
if(!bReturn)
{
message="发送请求失败";
return 0;
}


///第3行:接收的数据类型
bReturn=SocketSend(HTTPSocket,"Accept: */*\r\n");
if(!bReturn)
{
message="发送请求失败";
return 0;
}


///第4行：
temp=DownLoadAddress;
temp.Insert(0,"Referer ");
temp+="\r\n";
bReturn=SocketSend(HTTPSocket,temp);
if(!bReturn)
{
message="发送请求失败";
return 0;
}


///第5行:浏览器类型

bReturn=SocketSend(HTTPSocket,"User-Agent: Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt; DTS Agent;)\r\n");
if(!bReturn)
{
message="发送请求失败";
return 0;
}

///第6行:连接设置,保持
// SocketSend(HTTPSocket,"Connection:Keep-Alive\r\n");

///第7行:Cookie.

bReturn=SocketSend(HTTPSocket,"Cache-Control: no-cache\r\n");
if(!bReturn)
{
message="发送请求失败";
return 0;
}


bReturn=SocketSend(HTTPSocket,"Proxy-Connection: Keep-Alive\r\n");
if(!bReturn)
{
message="发送请求失败";
return 0;
}

/// 续传

Range是要下载的数据范围，对续传很重要
if(continueFlag)
{
temp.Format("Range: bytes=%d- \r\n",conLength);
bReturn=SocketSend(HTTPSocket,temp);
if(!bReturn)
{
message="发送请求失败";
return 0;
}
}


///最后一行:空行
bReturn=SocketSend(HTTPSocket,"\r\n");
if(!bReturn)
{
message="发送请求失败";
return 0;
}

///取得http头
int i;
i=GetHttpHeader(HTTPSocket,tmpBuffer);
if(!i)
{
message="获取HTTP头出错";
return 0;
}

//如果取得的http头含有404等字样，则表示连接出问题
temp=tmpBuffer;
if(temp.Find("404")!=-1)
{

return 0;
}

// 得到待下载文件的大小

filelength=GetFileLength(tmpBuffer);

return 1;
}


　　这样，就连接到网上的另一台机了，如何下载数据，不用多说了吧

while((num!=SOCKET_ERROR) && (num!=0))
{
num=recv (HTTPSocket
,(char FAR *)tmpBuffer
,(MAXBLOCKSIZE-1)
,0);


file.Write(tmpBuffer,num);

if(ExitFlag)
{
file.Close();
closesocket(HTTPSocket);

DownComplete=1;

m_message.CleanText();
m_message.ShowColorText(RGB(128,128,0),DLCompleteMes);

m_progress.ShowWindow(SW_HIDE);
m_stopDownload.ShowWindow(SW_HIDE);
_endthread();
}

}

posted on 2007-07-04 11:24 聂文龙 阅读(3318) 评论(2)  编辑 收藏 引用 所属分类: c++

FeedBack:
# re: 用VC++实现http代理 2007-08-08 21:54 聂文龙
http代理源码
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <winsock2.h>
#include <process.h>
#include <windows.h>
#include <assert.h>
#define MAXBUFLEN 20480
#define HTTPADDLEN 50
#define TIMEWAIT 2000
SOCKET Global[1000000];

void DisplayBanner();
void Proxy( void * pSocket);
int ParseHttpRequest(char * SourceBuf,int DataLen,void * ServerAddr);
void ParseError(char * ErrorMsg);

int main(int argc,char * argv[])
{
SOCKET MainSocket,ClientSocket;
struct sockaddr_in Host,Client;
WSADATA WsaData;
int AddLen,i;

//初始化
DisplayBanner();
if(WSAStartup(MAKEWORD(2,2),&WsaData) < 0)
{
printf("dll load error\n");
exit(-1);
}
//创建socket端口
MainSocket = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
if(MainSocket == SOCKET_ERROR)
{
ParseError("端口创建错误");
}
Host.sin_family = AF_INET;
Host.sin_port = htons(8080);
Host.sin_addr.s_addr = inet_addr("159.226.39.116");
printf("正在工作\n");
//邦定
if(bind(MainSocket,(SOCKADDR *)&Host,sizeof(Host)) != 0)
{
ParseError("邦定错误");
}
i = 0;
//监听
if(listen(MainSocket,5) == SOCKET_ERROR)
{
ParseError("监听错误");
}
AddLen = sizeof(Client);

//连接新的客户
i = 0;
while(1)
{
ClientSocket = accept(MainSocket,(SOCKADDR *)&Client,&AddLen);
if(ClientSocket == SOCKET_ERROR)
{
ParseError("接受客户请求错误");
}
printf(".");
i ++ ;
if( i >= 1000000)
i = 0;
Global[i] = ClientSocket;

//对于每一个客户启动不同的进程进行控制
//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？
_beginthread(Proxy,0,(void *)&Global[i]);

}



}
void Proxy( void * 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)* (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)
{
ParseError("错误\n");
closesocket(ClientSocket);
_endthread();
}
if(DataLen == 0)
{
closesocket(ClientSocket);
_endthread();
}
//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)
{
ParseError("端口创建错误");
_endthread();
}
if(connect(ProxySocket,(SOCKADDR *)&ServerAddr,sizeof(ServerAddr)) == SOCKET_ERROR)
{
//ParseError("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)
{
//ParseError("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)
{
// ParseError("数据接受错误");
break;

}
else
//发送到客户端
if(send(ClientSocket,ReceiveBuf,DataLen,0) < 0)
{
// ParseError("数据发送错误");
break;
}

}

error:
closesocket(ClientSocket);
closesocket(ProxySocket);
_endthread();
return;

}
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
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)
{
ParseError("服务器名字太长");
return -1;
}

//得到服务器信息
//如果地址信息是以IP地址(202.194.7.1)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;
}
void ParseError(char * ErrorMsg)
{
// printf("%s %d\n",ErrorMsg,GetLastError());
// WSACleanup();
// exit(-1);
}
void DisplayBanner()
{
printf("=================================================\n");
printf("==== ====\n");
printf("==== HTTP PROXY v2.0 ====\n");
printf("==== ====\n");
printf("=================================================\n");
}



  回复  更多评论
  
# re: 用VC++实现http代理 2007-08-08 22:56 聂文龙
#include "stdafx.h"
#include "Proxy.h"
#include < winsock2.h > //WINSOCKET API 2。0
#include < stdlib.h >
#include < stdio.h >
#include < string.h >

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////


#define HTTP "http://"
#define FTP "ftp://"
#define PROXYPORT 5001 //Proxy 端口
#define BUFSIZE 10240 //缓冲区大小


CWinApp theApp;

using namespace std;

UINT ProxyToServer(LPVOID pParam);
UINT UserToProxyThread(void *pParam);

struct SocketPair{
SOCKET user_proxy; //socket : 本地机器到PROXY 服务机
SOCKET proxy_server; //socket : PROXY 服务机到远程主机
BOOL IsUser_ProxyClosed; // 本地机器到PROXY 服务机状态
BOOL IsProxy_ServerClosed; // PROXY 服务机到远程主机状态
};


struct ProxyParam{
char Address[256]; // 远程主机地址
HANDLE User_SvrOK; // PROXY 服务机到远程主机的联结状态
SocketPair *pPair; // 维护一组SOCKET的指针
int Port; // 用来联结远程主机的端口
}; //这个结构用来PROXY SERVER与远程主机的信息交换.

SOCKET gListen_Socket; //用来侦听的SOCKET。

int StartServer() //启动服务
{
WSADATA wsaData;
sockaddr_in local;
SOCKET listen_socket;

if(::WSAStartup(0x202,&wsaData)!=0)
{printf("\nError in Startup session.\n");WSACleanup();return -1;};

local.sin_family=AF_INET;
local.sin_addr.s_addr=INADDR_ANY;
local.sin_port=htons(PROXYPORT);

listen_socket=socket(AF_INET,SOCK_STREAM,0);
if(listen_socket==INVALID_SOCKET)
{printf("\nError in New a Socket.");WSACleanup();return -2;}

if(::bind(listen_socket,(sockaddr *)&local,sizeof(local))!=0)
{printf("\n Error in Binding socket."); WSACleanup();return -3; };

if(::listen(listen_socket,5)!=0)
{printf("\n Error in Listen."); WSACleanup(); return -4;}
gListen_Socket=listen_socket;
AfxBeginThread(UserToProxyThread,NULL); //启动侦听
return 1;
}

int CloseServer() //关闭服务
{
closesocket(gListen_Socket);
WSACleanup();
return 1;
}
//分析接收到的字符，得到远程主机地址

int GetAddressAndPort( char * str, char *address, int * port)
{
char buf[BUFSIZE], command[512], proto[128], *p;
int j;
sscanf(str,"%s%s%s",command,buf,proto);
p=strstr(buf,HTTP);
//HTTP
if(p)
{
p+=strlen(HTTP);
for(int i=0;i< strlen(p);i++)
if( *(p+i)=='/') break;
*(p+i)=0;
strcpy(address,p);
p=strstr(str,HTTP);
for(int j=0;j< i+strlen(HTTP);j++)
*(p+j)=' '; //去掉远程主机名: GET http:/www.csdn.net/ HTTP1.1 == > GET / HTTP1.1
*port=80; //缺省的 http 端口
}
else
{//FTP, 不支持, 下面的代码可以省略.
p=strstr(buf,FTP);
if(!p) return 0;
p+=strlen(FTP);
for(int i=0;i< strlen(p);i++)
if( *(p+i)=='/') break; //Get The Remote Host
*(p+i)=0;
for(j=0;j< strlen(p);j++)
if(*(p+j)==':')
{*port=atoi(p+j+1); //Get The Port
*(p+j)=0;
}
else *port=21;

strcpy(address,p);
p=strstr(str,FTP);
for(j=0;j< i+strlen(FTP);j++)
*(p+j)=' ';
}
return 1;
}

// 取到本地的数据，发往远程主机
UINT UserToProxyThread(void *pParam)
{
char Buffer[BUFSIZE];
int Len;
sockaddr_in from;
SOCKET msg_socket;
int fromlen,retval;
SocketPair SPair;
ProxyParam ProxyP;
CWinThread *pChildThread;
fromlen=sizeof(from);
msg_socket=accept(gListen_Socket,(struct sockaddr*)&from,&fromlen);
AfxBeginThread(UserToProxyThread,pParam); //启动另一侦听.
if( msg_socket==INVALID_SOCKET)
{ printf( "\nError in accept "); return -5;}
//读客户的第一行数据

SPair.IsUser_ProxyClosed=FALSE;
SPair.IsProxy_ServerClosed=TRUE;
SPair.user_proxy=msg_socket;

retval=recv(SPair.user_proxy,Buffer,sizeof(Buffer),0);

if(retval==SOCKET_ERROR)
{ printf("\nError Recv");
if(SPair.IsUser_ProxyClosed==FALSE)
{closesocket(SPair.user_proxy);
SPair.IsUser_ProxyClosed=TRUE;
}
}
if(retval==0)
{printf("Client Close connection\n");
if(SPair.IsUser_ProxyClosed==FALSE)
{closesocket(SPair.user_proxy);
SPair.IsUser_ProxyClosed=TRUE;
}
}
Len=retval;
#ifdef _DEBUG

Buffer[Len]=0;
printf("\n Received %d bytes,data[%s]from client\n",retval,Buffer);
#endif
//
SPair.IsUser_ProxyClosed=FALSE;
SPair.IsProxy_ServerClosed=TRUE;
SPair.user_proxy=msg_socket;

ProxyP.pPair=&SPair;
ProxyP.User_SvrOK=CreateEvent(NULL,TRUE,FALSE,NULL);

GetAddressAndPort( Buffer,ProxyP.Address,&ProxyP.Port);

pChildThread=AfxBeginThread(ProxyToServer,(LPVOID)&ProxyP);
::WaitForSingleObject(ProxyP.User_SvrOK,60000); //等待联结
::CloseHandle(ProxyP.User_SvrOK);

while(SPair.IsProxy_ServerClosed ==FALSE && SPair.IsUser_ProxyClosed==FALSE)
{
retval=send(SPair.proxy_server,Buffer,Len,0);
if(retval==SOCKET_ERROR)
{ printf("\n send() failed:error%d\n",WSAGetLastError());
if(SPair.IsProxy_ServerClosed==FALSE)
{
closesocket(SPair.proxy_server);
SPair.IsProxy_ServerClosed=TRUE;
}
continue;
}
retval=recv(SPair.user_proxy,Buffer,sizeof(Buffer),0);

if(retval==SOCKET_ERROR)
{ printf("\nError Recv");
if(SPair.IsUser_ProxyClosed==FALSE)
{closesocket(SPair.user_proxy);
SPair.IsUser_ProxyClosed=TRUE;
}
continue;
}
if(retval==0)
{printf("Client Close connection\n");
if(SPair.IsUser_ProxyClosed==FALSE)
{closesocket(SPair.user_proxy);
SPair.IsUser_ProxyClosed=TRUE;
}
break;
}
Len=retval;
#ifdef _DEBUG
Buffer[Len]=0;
printf("\n Received %d bytes,data[%s]from client\n",retval,Buffer);
#endif

} //End While

if(SPair.IsProxy_ServerClosed==FALSE)
{
closesocket(SPair.proxy_server);
SPair.IsProxy_ServerClosed=TRUE;
}
if(SPair.IsUser_ProxyClosed==FALSE)
{closesocket(SPair.user_proxy);
SPair.IsUser_ProxyClosed=TRUE;
}
::WaitForSingleObject(pChildThread- >m_hThread,20000); //Should check the return value
return 0;
}
// 读取远程主机数据，并发往本地客户机
UINT ProxyToServer(LPVOID pParam){
ProxyParam * pPar=(ProxyParam*)pParam;
char Buffer[BUFSIZE];
char *server_name= "localhost";
unsigned short port ;
int retval,Len;
unsigned int addr;
int socket_type ;
struct sockaddr_in server;
struct hostent *hp;
SOCKET conn_socket;

socket_type = SOCK_STREAM;
server_name = pPar- >Address;
port = pPar- >Port;

if (isalpha(server_name[0])) { /* server address is a name */
hp = gethostbyname(server_name);
}
else { /* Convert nnn.nnn address to a usable one */
addr = inet_addr(server_name);
hp = gethostbyaddr((char *)&addr,4,AF_INET);
}
if (hp == NULL ) {
fprintf(stderr,"Client: Cannot resolve address [%s]: Error %d\n",
server_name,WSAGetLastError());
::SetEvent(pPar- >User_SvrOK);
return 0;
}

//
// Copy the resolved information into the sockaddr_in structure
//
memset(&server,0,sizeof(server));
memcpy(&(server.sin_addr),hp- >h_addr,hp- >h_length);
server.sin_family = hp- >h_addrtype;
server.sin_port = htons(port);

conn_socket = socket(AF_INET,socket_type,0); /* 打开一个 socket */
if (conn_socket < 0 ) {
fprintf(stderr,"Client: Error Opening socket: Error %d\n",
WSAGetLastError());
pPar- >pPair- >IsProxy_ServerClosed=TRUE;
::SetEvent(pPar- >User_SvrOK);
return -1;
}
#ifdef _DEBUG
printf("Client connecting to: %s\n",hp- >h_name);
#endif
if (connect(conn_socket,(struct sockaddr*)&server,sizeof(server))
== SOCKET_ERROR) {
fprintf(stderr,"connect() failed: %d\n",WSAGetLastError());
pPar- >pPair- >IsProxy_ServerClosed=TRUE;
::SetEvent(pPar- >User_SvrOK);
return -1;
}
pPar- >pPair- >proxy_server=conn_socket;
pPar- >pPair- >IsProxy_ServerClosed=FALSE;
::SetEvent(pPar- >User_SvrOK);
// cook up a string to send
while(!pPar- >pPair- >IsProxy_ServerClosed &&!pPar- >pPair- >IsUser_ProxyClosed)
{
retval = recv(conn_socket,Buffer,sizeof (Buffer),0 );
if (retval == SOCKET_ERROR ) {
fprintf(stderr,"recv() failed: error %d\n",WSAGetLastError());
closesocket(conn_socket);
pPar- >pPair- >IsProxy_ServerClosed=TRUE;
break;
}
Len=retval;
if (retval == 0) {
printf("Server closed connection\n");
closesocket(conn_socket);
pPar- >pPair- >IsProxy_ServerClosed=TRUE;
break;
}

retval = send(pPar- >pPair- >user_proxy,Buffer,Len,0);
if (retval == SOCKET_ERROR) {
fprintf(stderr,"send() failed: error %d\n",WSAGetLastError());
closesocket(pPar- >pPair- >user_proxy);
pPar- >pPair- >IsUser_ProxyClosed=TRUE;
break;
}
#ifdef _DEBUG
Buffer[Len]=0;
printf("Received %d bytes, data [%s] from server\n",retval,Buffer);
#endif
}
if(pPar- >pPair- >IsProxy_ServerClosed==FALSE)
{
closesocket(pPar- >pPair- >proxy_server);
pPar- >pPair- >IsProxy_ServerClosed=TRUE;
}
if(pPar- >pPair- >IsUser_ProxyClosed==FALSE)
{closesocket(pPar- >pPair- >user_proxy);
pPar- >pPair- >IsUser_ProxyClosed=TRUE;
}
return 1;
}



int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
int nRetCode = 0;

// 初始化SOCKET
if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
{
// 错误处理
cerr < < _T("Fatal Error: MFC initialization failed") < < endl;
nRetCode = 1;
}
else
{
// 主程序开始.
StartServer();
while(1)
if(getchar()=='q') break;
CloseServer();
}

return nRetCode;
}


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