Function valid_host

scheduler/client.c:3658–3818

 */

static int				/* O - 1 if valid, 0 if not */
valid_host(cupsd_client_t *con)		/* I - Client connection */
{
  cupsd_alias_t	*a;			/* Current alias */
  cupsd_netif_t	*netif;			/* Current network interface */
  const char	*end;			/* End character */
  char		*ptr;			/* Pointer into host value */


 /*
  * Copy the Host: header for later use...
  */

  strlcpy(con->clientname, httpGetField(con->http, HTTP_FIELD_HOST),
          sizeof(con->clientname));
  if ((ptr = strrchr(con->clientname, ':')) != NULL && !strchr(ptr, ']'))
  {
    *ptr++ = '\0';
    con->clientport = atoi(ptr);
  }
  else
    con->clientport = con->serverport;

 /*
  * Then validate...
  */

  if (httpAddrLocalhost(httpGetAddress(con->http)))
  {
   /*
    * Only allow "localhost" or the equivalent IPv4 or IPv6 numerical
    * addresses when accessing CUPS via the loopback interface...
    */

    return (!_cups_strcasecmp(con->clientname, "localhost") ||
	    !_cups_strcasecmp(con->clientname, "localhost.") ||
            !strcmp(con->clientname, "127.0.0.1") ||
	    !strcmp(con->clientname, "[::1]"));
  }

#ifdef HAVE_DNSSD
 /*
  * Check if the hostname is something.local (Bonjour); if so, allow it.
  */

  if ((end = strrchr(con->clientname, '.')) != NULL && end > con->clientname &&
      !end[1])
  {
   /*
    * "." on end, work back to second-to-last "."...
    */

    for (end --; end > con->clientname && *end != '.'; end --);
  }

  if (end && (!_cups_strcasecmp(end, ".local") ||
	      !_cups_strcasecmp(end, ".local.")))
    return (1);