/*
* Copyright (C) 2004 by the Massachusetts Institute of Technology,
* Cambridge, MA, USA. All Rights Reserved.
*
* This software is being provided to you, the LICENSEE, by the
* Massachusetts Institute of Technology (M.I.T.) under the following
* that you have read, understood, and will comply with these terms and
* conditions:
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify and distribute
* this software and its documentation for any purpose and without fee or
* royalty is hereby granted, provided that you agree to comply with the
* following copyright notice and statements, including the disclaimer, and
* that the same appear on ALL copies of the software and documentation,
* including modifications that you make for internal use or for
* distribution:
*
* THIS SOFTWARE IS PROVIDED "AS IS", AND M.I.T. MAKES NO REPRESENTATIONS
* OR WARRANTIES, EXPRESS OR IMPLIED. By way of example, but not
* limitation, M.I.T. MAKES NO REPRESENTATIONS OR WARRANTIES OF
* MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF
* THE LICENSED SOFTWARE OR DOCUMENTATION WILL NOT INFRINGE ANY THIRD PARTY
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* be used in advertising or publicity pertaining to distribution of the
* software. Title to copyright in this software and any associated
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* preserve same.
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*/
/* Approach overview:
If a system version is available but buggy, save handles to it,
redefine the names to refer to static functions defined here, and
in those functions, call the system versions and fix up the
returned data. Use the native data structures and flag values.
If no system version exists, use gethostby* and fake it. Define
the data structures and flag values locally.
On Mac OS X, getaddrinfo results aren't cached (though
gethostbyname results are), so we need to build a cache here. Now
things are getting really messy. Because the cache is in use, we
use getservbyname, and throw away thread safety. (Not that the
cache is thread safe, but when we get locking support, that'll be
dealt with.) This code needs tearing down and rebuilding, soon.
Note that recent Windows developers' code has an interesting hack:
When you include the right header files, with the right set of
macros indicating system versions, you'll get an inline function
that looks for getaddrinfo (or whatever) in the system library, and
calls it if it's there. If it's not there, it fakes it with
gethostby* calls.
We're taking a simpler approach: A system provides these routines or
it does not.
Someday, we may want to take into account different versions (say,
different revs of GNU libc) where some are broken in one way, and
some work or are broken in another way. Cross that bridge when we
come to it. */
/* To do, maybe:
+ For AIX 4.3.3, using the RFC 2133 definition: Implement
AI_NUMERICHOST. It's not defined in the header file.
For certain (old?) versions of GNU libc, AI_NUMERICHOST is
defined but not implemented.
+ Use gethostbyname2, inet_aton and other IPv6 or thread-safe
functions if available. But, see
gethostbyname2 problem on Linux. And besides, if a platform is
supporting IPv6 at all, they really should be doing getaddrinfo
by now.
+ inet_ntop, inet_pton
library can have a single copy instead of multiple.
+ Upgrade host requirements to include working implementations of
these functions, and throw all this away. Pleeease? :-) */
#include "port-sockets.h"
#include "socket-utils.h"
#include "k5-platform.h"
#include "k5-thread.h"
#include "fake-addrinfo.h"
#define FAI_CACHE
#endif
struct face {
};
/* fake addrinfo cache */
struct fac {
};
extern struct fac krb5int_fac;
extern int krb5int_init_fac (void);
extern void krb5int_fini_fac (void);