reactos/apps/utils/net/telnet/main.cpp

   1 /* $Id: main.cpp,v 1.1 2001/01/27 22:38:43 ea Exp $
   2  *
   3  * FILE       : main.cpp
   4  * AUTHOR     : unknown (sources found on www.telnet.org)
   5  * PROJECT    : ReactOS Operating System
   6  * DESCRIPTION: telnet client for the W32 subsystem
   7  * DATE       : 2001-01-21
   8  * REVISIONS
   9  *      2001-02-21 ea   Modified to compile under 0.0.16 src tree
  10  *      2001-02-27 ea   If run with no argument, it asks for a hostname.
  11  */
  12 ///////////////////////////////////////////////////////////////////////////////
  13 //
  14 // File:
  15 //        main.cpp
  16 //
  17 // Purpose:
  18 //        This file provdes the main entry point for the project, and all the
  19 //        global scope support routines.
  20 //
  21 // Notes:
  22 //        This file expects to be linked without the C-Runtime. If compiling,
  23 //        please force the entry point symbol to be "main", and do not link in
  24 //        the default librarys.
  25 //        This means that no c-runtime functions can be used anywhere in the
  26 //        project. I expect this will also exclude any MFC based additions.
  27 //
  28 ///////////////////////////////////////////////////////////////////////////////
  29
  30 #include <winsock.h>
  31 #include <windows.h>
  32 #include <process.h>
  33 #include <stdlib.h>
  34
  35 #include "telnet.h"
  36
  37 ///////////////////////////////////////////////////////////////////////////////
  38
  39 //
  40 // Our simple replacement for the c-runtime includes getting the StandardInput,
  41 // StandardOutput & StandardError handles, and providing new and delete operators, that work
  42 // with the win32 heap functions.
  43 //
  44
  45 //
  46 // standard handles needed for CRT emulation
  47 //
  48 HANDLE hHeap;
  49 HANDLE StandardInput;
  50 HANDLE StandardOutput;
  51 HANDLE StandardError;
  52
  53 //
  54 // new will use the win32 heap functions.
  55 //
  56 void* operator new(unsigned int nSize)
  57 {
  58   return HeapAlloc(hHeap,0,nSize);
  59 }
  60
  61 //
  62 // delete operator provides all memory de-allocation.
  63 // HeapFree doesn't accept NULL.
  64 //
  65 void operator delete(void* pMem)
  66 {
  67   if(pMem) HeapFree(hHeap,0,pMem);
  68 }
  69
  70
  71
  72 void err(char const* s, ...)
  73 {
  74         char    buf [1024];
  75         DWORD   nout;
  76
  77         wvsprintf (buf, s, (char*)(s + sizeof(int)));
  78         WriteFile (StandardError,"Error: ", 7, & nout, NULL);
  79         WriteFile (StandardError, buf, lstrlen(buf), & nout, NULL);
  80         WriteFile (StandardError, "\r\n\r\n", 4, & nout, NULL);
  81 #ifdef _DEBUG
  82         OutputDebugString(buf);
  83         OutputDebugString("\n");
  84 #endif
  85         ExitProcess (ERROR_SUCCESS);
  86 }
  87
  88
  89 int main(int argc, char * argv[])
  90 {
  91         WSADATA wd;
  92         int     errn;
  93         char    name [256] = {'\0'};
  94         short   port = IPPORT_TELNET; /* default tcp port */
  95
  96         ///////////////////////////////////////
  97         // CRT emulation init
  98         // Get the IO handles
  99         StandardInput = GetStdHandle(STD_INPUT_HANDLE);
 100         StandardOutput = GetStdHandle(STD_OUTPUT_HANDLE);
 101         StandardError = GetStdHandle(STD_ERROR_HANDLE);
 102
 103         // Get the heap
 104         hHeap = GetProcessHeap();
 105
 106         // Explicitly force the console into a good mode (actually all we are doing is turning
 107         // mouse input off.
 108         SetConsoleMode (
 109                 StandardInput,
 110                 (ENABLE_LINE_INPUT | ENABLE_ECHO_INPUT | ENABLE_PROCESSED_INPUT)
 111                 );
 112
 113         ///////////////////////////////////////
 114         // Init winsock
 115
 116         if (errn = WSAStartup (0x0101, & wd))
 117         {
 118                 err(sockmsg(errn));
 119         }
 120
 121         /* hostname */
 122         if (1 < argc)
 123         {
 124                 lstrcpy (name, argv [1]);
 125         }
 126         /*
 127          * Default port is IPPORT_TELNET.
 128          * User may hand one.
 129          */
 130         if (3 == argc)
 131         {
 132                 port = atoi (argv[2]);
 133                 if (port <= 0)
 134                 {
 135                         struct servent * service = NULL;
 136
 137                         service = getservbyname (argv[2], "tcp");
 138                         if (NULL == service)
 139                         {
 140                                 err("Invalid service name specified");
 141                         }
 142                         port = service->s_port;
 143                 }
 144                 else
 145                 {
 146                         err("Invalid port specified");
 147                 }
 148         }
 149         /* Too many arguments */
 150         if (3 < argc)
 151         {
 152                 err("Usage: telnet <hostname> [<port>]");
 153         }
 154         /* No argument */
 155         if (1 == argc)
 156         {
 157                 DWORD Count;
 158                 char *c;
 159
 160                 WriteFile (StandardError,"host: ", 6, & Count, NULL);
 161                 ReadFile (StandardInput, name, sizeof name, & Count, NULL);
 162                 c = name;
 163                 while (*c > ' ') ++ c;
 164                 *c = '\0';
 165         }
 166
 167         // guess what this does.
 168         telnet (name, port);
 169
 170         //Bye bye...
 171         WSACleanup ();
 172
 173         // Exit process terminates any waiting threads.
 174         // (Its the CRT that makes a process close when the main thread exits.
 175         // The WinAPI will leave the process as is for as long as it has a
 176         // thread any thread.
 177         ExitProcess (EXIT_SUCCESS);
 178 }
 179
 180 /* EOF */