21. FAQ o Win API

Q> Who on a network or locally is rummaged on mine (not by mine) the machine? 
A>  
//------------------------------------------------------ 
//Who.exe (c) 1999 Serge Andyk asvzzz@chat.ru  
//Usage "who [server]". Show all local and network users 
//on specified server and some additional information. 
//Freeware. You can use and modify this source code 
//as you wish. 
//------------------------------------------------------- 

#include <windows.h> 
#include <lm.h> 
#include <stdio.h> 
#pragma hdrstop 

#pragma comment (lib, "netapi32.lib") 

#define MAXLEN 256 

 SESSION_INFO_502 *buf, *cur; 
 WKSTA_USER_INFO_1 *bufw, *curw; 
 FILE_INFO_3 *buff, *curf; 

 DWORD read, total, resumeh, rc, i; 
//----------------------------------------------------------- 
void PrintError (DWORD err) 
{ 
 char msgbuf [4096]; 

 FormatMessage (FORMAT_MESSAGE_FROM_SYSTEM, NULL, err, 
  MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT), 
  msgbuf, sizeof (msgbuf), NULL); 
 printf ("Error %d: %s\n", err, msgbuf); 
}
//------------------------------------------------------- 

void PrintLocalUsers (LPWSTR server) 
{ 
 resumeh = 0; 
 do 
 { 
  bufw = NULL; 

  rc = NetWkstaUserEnum ( 
   (LPTSTR) server, 
   1, 
   (LPBYTE *) &bufw, 
   2048, 
   &read, 
   &total, 
   &resumeh); 

  if (rc! = ERROR_MORE_DATA && rc! = ERROR_SUCCESS) 
   break; 

{ 
  for (i = 0, curw = bufw; i <read; ++ i, ++ curw) 
  { 
   printf ("%-12S %-15S %-12S \n", 
    curw-> wkui1_username, curw-> wkui1_logon_domain, 
    curw-> wkui1_logon_server 
    );

  }
}
  if (bufw! = NULL) 
  NetApiBufferFree (bufw); 

 } while (rc == ERROR_MORE_DATA); 

 if (rc! = ERROR_SUCCESS) PrintError (rc); 
}
//------------------------------------------------------- 
void PrintNetUsers (LPWSTR server) 
{ 
 resumeh = 0; 
 do 
 { 
  buf = NULL; 

  rc = NetSessionEnum ( 
   (LPTSTR) server, 
   NULL, 
   NULL, 
   502, 
   (LPBYTE *) &buf, 
   2048, 
   &read, 
   &total, 
   &resumeh); 

  if (rc! = ERROR_MORE_DATA && rc! = ERROR_SUCCESS) 
   break; 
{ 
  for (i = 0, cur = buf; i <read; ++ i, ++ cur) 
  { 
   printf ("%-12S %-12S %-27S %-22S\n", 
    cur-> sesi502_username, cur-> sesi502_cname, cur-> sesi502_transport, 
    cur-> sesi502_cltype_name 
    );
  }
}

  if (buf! = NULL) 
   NetApiBufferFree (buf); 

 } while (rc == ERROR_MORE_DATA); 

 if (rc! = ERROR_SUCCESS) PrintError (rc); 
}
//------------------------------------------------------- 
void PrintNetFiles (LPWSTR server) 
{ 

 resumeh = 0; 
 do 
 { 
  buff = NULL; 

  rc=NetFileEnum ( 
   (char *) server, 
   NULL, 
   NULL, 
   3, 
      (BYTE **) &buff, 
   2048, 
   &read, 
   &total, 
   &resumeh); 


  if (rc! = ERROR_MORE_DATA && rc! = ERROR_SUCCESS) 
   break; 


  for (i = 0, curf = buff; i <read; ++ i, ++ curf) 
  { 
   printf ("%-12S %-15S \n", 
    curf-> fi3_username, curf-> fi3_pathname 
    );

  }
  if (buff! = NULL) 
  NetApiBufferFree (buff); 

 } while (rc == ERROR_MORE_DATA); 

  if (rc! = ERROR_SUCCESS) PrintError (rc); 

}
//------------------------------------------------------- 
int main (int argc, char *argv []) 
{ 

 WCHAR server [MAXLEN]; 

 if (argc == 1) 
 { 
  wcscpy (server, L ""); 
 }
 else 
 if (argc == 2) 
 { 
  mbstowcs (server, argv [1], MAXLEN); 
 }
 else 
        { 
 printf ("Usage - who [server]"); 
 exit (1); 
 }

 printf ("\nLocal users:\n"); 
 PrintLocalUsers (server); 
 printf ("\nNet users:\n"); 
 PrintNetUsers (server); 
 printf ("\nFiles (Pipes) \n"); 
 PrintNetFiles (server);	 

 return 0; 
}