/*

 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.

 */

#include	<sys/types.h>

#include	<unistd.h>

#include	<dlfcn.h>

#include	"k5-int.h"

#define		KRB5_UID	"app_krb5_user_uid"

/*

 * mech_krb5 makes various calls to getuid().  When employed by gssd(1M) and

 * ktkt_warnd(1M), app_krb5_user_uid() is used to select a given user's

 * credential cache, rather than the id of the process.

 */

uid_t

krb5_getuid()

{

	static uid_t	(*gptr)() = NULL;

	void		*handle;

	if (gptr == NULL) {

		/*

		 * Specifically look for app_krb5_user_uid() in the application,

		 * and don't fall into an exhaustive search through all of the

		 * process dependencies.  This interface is suplied from

		 * gssd(1M) and ktkt_warnd(1M).

		 */

		if (((handle = dlopen(0, (RTLD_LAZY | RTLD_FIRST))) == NULL) ||

		    ((gptr = (uid_t (*)())dlsym(handle, KRB5_UID)) == NULL)) {

			/*

			 * Fall back to the default getuid(), which is probably

			 * libc.

			 */

			gptr = &getuid;

		}

	}

	/*

	 * Return the appropriate uid.  Note, if a default getuid() couldn't

	 * be found, the getuid assignment would have failed to relocate, and

	 * hence this module would fail to load.

	 */

	return ((*gptr)());

}