Thread: Socket handles

hi everybody,I am a beginner in C programming and i am currently learning sockets. I am now able to make my socket listening.My next challenge is to make a server that spawn a program like cmd or a command line program when a telnet client connect to it. I must admit that i need help for this one. I found that the easier way is to make a listening socket, handle the process then create the process. Iwrote a code but i can t make it work.Maybe someone can tell me what s wrong with my code or give me some advices.Here is my code (wich might be full or errors ):

Code:

#include <stdio.h>
#include <windows.h>
#include <winsock.h>

int main() {


   WORD sockVersion;
   WSADATA wsaData;

   sockVersion = MAKEWORD(1, 1);

   WSAStartup(sockVersion, &wsaData);

   SOCKET mysocket;
   mysocket = socket( AF_INET,
                      SOCK_STREAM,
                      IPPROTO_TCP);

   SOCKADDR_IN serverInfo;
   serverInfo.sin_family = AF_INET;
   serverInfo.sin_addr.s_addr = INADDR_ANY;
   serverInfo.sin_port = htons(12235);
   
   bind(mysocket,(LPSOCKADDR)&serverInfo, sizeof(struct sockaddr));

   listen(mysocket, 10);

   SOCKET client;
   client = accept(mysocket,
			   NULL,
			   NULL);

   HANDLE currentProcess; 
   currentProcess=GetCurrentProcess(); 
   HANDLE output; 
   DuplicateHandle(currentProcess, (HANDLE)client, currentProcess, 
   &output, 0, TRUE, DUPLICATE_SAME_ACCESS);

   HANDLE input; 
   DuplicateHandle(currentProcess, (HANDLE)client, currentProcess, 
   &input, 0, TRUE, DUPLICATE_SAME_ACCESS); 

   

   STARTUPINFO          si = { sizeof(si) };
   PROCESS_INFORMATION  pi;
   char                 szExe[] = "cmd.exe";
   si.dwFlags=STARTF_USESTDHANDLES; 
   si.hStdInput=input; 
   si.hStdOutput=output;

   if(CreateProcess(0, szExe, 0, 0, TRUE , CREATE_NEW_CONSOLE , 0, 0, &si, &pi))
   {
    CloseHandle(pi.hProcess);
    CloseHandle(pi.hThread);
   }
    
  CloseHandle(input); 
  CloseHandle(output);


  closesocket(client);
  closesocket(mysocket); 

WSACleanup();
return 0;}

Thank you for your help. I wish one day i will be able to help you

i can t make it work

Could you be more specific? What errors are you getting? Where are you stuck? What's happening that shouldn't be, or vice-versa?