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libcares/ares_getaddrinfo.c  view on Meta::CPAN

          status = status_code;   /* Use original status code */
          break;
        }
    }
  end_hquery(hquery, status);
}

static int file_lookup(struct host_query *hquery)
{
  FILE *fp;
  int error;
  int status;

#ifdef WIN32
  char PATH_HOSTS[MAX_PATH];
  win_platform platform;

  PATH_HOSTS[0] = '\0';

  platform = ares__getplatform();

  if (platform == WIN_NT) {
    char tmp[MAX_PATH];
    HKEY hkeyHosts;

    if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, WIN_NS_NT_KEY, 0, KEY_READ,
                     &hkeyHosts) == ERROR_SUCCESS)
    {
      DWORD dwLength = MAX_PATH;
      RegQueryValueEx(hkeyHosts, DATABASEPATH, NULL, NULL, (LPBYTE)tmp,
                      &dwLength);
      ExpandEnvironmentStrings(tmp, PATH_HOSTS, MAX_PATH);
      RegCloseKey(hkeyHosts);
    }
  }
  else if (platform == WIN_9X)
    GetWindowsDirectory(PATH_HOSTS, MAX_PATH);
  else
    return ARES_ENOTFOUND;

  strcat(PATH_HOSTS, WIN_PATH_HOSTS);

#elif defined(WATT32)
  extern const char *_w32_GetHostsFile (void);
  const char *PATH_HOSTS = _w32_GetHostsFile();

  if (!PATH_HOSTS)
    return ARES_ENOTFOUND;
#endif

  fp = fopen(PATH_HOSTS, "r");
  if (!fp)
    {
      error = ERRNO;
      switch(error)
        {
        case ENOENT:
        case ESRCH:
          return ARES_ENOTFOUND;
        default:
          DEBUGF(fprintf(stderr, "fopen() failed with error: %d %s\n",
                         error, strerror(error)));
          DEBUGF(fprintf(stderr, "Error opening file: %s\n",
                         PATH_HOSTS));
          return ARES_EFILE;
        }
    }
  status = ares__get_addrinfo(fp, hquery->name, hquery->port, &hquery->hints, &hquery->ai);
  fclose(fp);
  return status;
}

/* Resolve service name into port number given in host byte order. 
 * If not resolved, return 0.
 */
static unsigned short lookup_service(const char *service, int flags)
{
  const char *proto;
  struct servent *sep;
#ifdef HAVE_GETSERVBYNAME_R
  struct servent se;
  char tmpbuf[4096];
#endif

  if (service)
    {
      if (flags & ARES_NI_UDP)
        proto = "udp";
      else if (flags & ARES_NI_SCTP)
        proto = "sctp";
      else if (flags & ARES_NI_DCCP)
        proto = "dccp";
      else
        proto = "tcp";
#ifdef HAVE_GETSERVBYNAME_R
      memset(&se, 0, sizeof(se));
      sep = &se;
      memset(tmpbuf, 0, sizeof(tmpbuf));
#if GETSERVBYNAME_R_ARGS == 6
      if (getservbyname_r(service, proto, &se, (void *)tmpbuf, sizeof(tmpbuf),
                          &sep) != 0)
        sep = NULL; /* LCOV_EXCL_LINE: buffer large so this never fails */
#elif GETSERVBYNAME_R_ARGS == 5
      sep = getservbyname_r(service, proto, &se, (void *)tmpbuf, sizeof(tmpbuf));
#elif GETSERVBYNAME_R_ARGS == 4
      if (getservbyname_r(service, proto, &se, (void *)tmpbuf) != 0)
        sep = NULL;
#else
      /* Lets just hope the OS uses TLS! */
      sep = getservbyname(service, proto);
#endif
#else
        /* Lets just hope the OS uses TLS! */
#if (defined(NETWARE) && !defined(__NOVELL_LIBC__))
      sep = getservbyname(service, (char *)proto);
#else
      sep = getservbyname(service, proto);
#endif
#endif
      return (sep ? ntohs((unsigned short)sep->s_port) : 0);
    }
  return 0;
}