helpsock.cpp

telnet客户端编程

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

#include "telnet.h"

char const* sockmsg(int ecode)
{
  switch(ecode)
  {
// programming errors
// (should never occour in release code?)
  case WSASYSNOTREADY: return "tcp/ip network not ready";
  case WSAEINVAL: return "invalid winsock version";
  case WSAVERNOTSUPPORTED: return "wrong winsock version";
  case WSANOTINITIALISED: return "winsock not initialized";
  case WSAEINTR: "The call was canceled";
  case WSAEINPROGRESS: "A blocking winsock operation is in progress";
  default: return "unknown winsock error";
// general TCP problems
  case WSAENETDOWN: return "winsock has detected that the network subsystem has failed";
// GetXbyY related errors:
  case WSAHOST_NOT_FOUND: return "Authoritative Answer Host not found";
  case WSATRY_AGAIN: return "Non-Authoritative Host not found, or SERVERFAIL";
  case WSANO_RECOVERY: "Nonrecoverable errors: FORMERR, REFUSED, NOTIMP";
  case WSANO_DATA: "Valid name, no data record of requested type";
  }
}

_tag_well_known_port_numbers well_known_port_numbers[] =
{
  {7,"echo"},
  {9,"discard"},
  {13,"daytime"},
  {19,"chargen"},
  {21,"ftp"},
  {23,"telnet"},
  {25,"smtp"},
  {70,"gopher"},
  {79,"finger"},
  {80,"http"},
  {110,"pop3"},
  {119,"nntp"},
  {191,"prospero"},
  {194,"irc"},
  {0,0}
};