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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 
     22 /*
     23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 /*	Copyright (c) 1988 AT&T	*/
     28 /*	  All Rights Reserved  	*/
     29 
     30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     31 
     32 #pragma weak _getgrnam	= getgrnam
     33 #pragma weak _getgrgid	= getgrgid
     34 
     35 #include "lint.h"
     36 #include <sys/types.h>
     37 #include <grp.h>
     38 #include <nss_dbdefs.h>
     39 #include <stdio.h>
     40 #include "tsd.h"
     41 
     42 #ifdef	NSS_INCLUDE_UNSAFE
     43 
     44 extern size_t _nss_get_bufsizes(int arg);
     45 
     46 /*
     47  * Ye olde non-reentrant interface (MT-unsafe, caveat utor)
     48  */
     49 
     50 static void
     51 free_grbuf(void *arg)
     52 {
     53 	nss_XbyY_buf_t **buffer = arg;
     54 
     55 	NSS_XbyY_FREE(buffer);
     56 }
     57 
     58 static nss_XbyY_buf_t *
     59 get_grbuf(int max_buf)
     60 {
     61 	nss_XbyY_buf_t **buffer =
     62 	    tsdalloc(_T_GRBUF, sizeof (nss_XbyY_buf_t *), free_grbuf);
     63 	nss_XbyY_buf_t *b;
     64 	size_t	blen;
     65 
     66 	if (buffer == NULL)
     67 		return (NULL);
     68 	if (max_buf == 0)
     69 		blen = _nss_get_bufsizes(0);		/* default size */
     70 	else
     71 		blen = sysconf(_SC_GETGR_R_SIZE_MAX);	/* max size */
     72 	if (*buffer) {
     73 		if ((*buffer)->buflen >= blen)	/* existing size fits */
     74 			return (*buffer);
     75 		NSS_XbyY_FREE(buffer);		/* existing is too small */
     76 	}
     77 	b = NSS_XbyY_ALLOC(buffer, sizeof (struct group), blen);
     78 	return (b);
     79 }
     80 
     81 struct group *
     82 getgrgid(gid_t gid)
     83 {
     84 	nss_XbyY_buf_t	*b = get_grbuf(0);
     85 	struct group *ret;
     86 
     87 	if (b == NULL)
     88 		return (NULL);
     89 
     90 	ret = getgrgid_r(gid, b->result, b->buffer, b->buflen);
     91 	if (ret == NULL && errno == ERANGE) {
     92 		b = get_grbuf(1);
     93 		if (b == NULL)
     94 			return (NULL);
     95 		ret = getgrgid_r(gid, b->result, b->buffer, b->buflen);
     96 	}
     97 	return (ret);
     98 }
     99 
    100 struct group *
    101 getgrnam(const char *nam)
    102 {
    103 	nss_XbyY_buf_t	*b = get_grbuf(0);
    104 	struct group *ret;
    105 
    106 	if (b == NULL)
    107 		return (NULL);
    108 
    109 	ret = getgrnam_r(nam, b->result, b->buffer, b->buflen);
    110 	if (ret == NULL && errno == ERANGE && nam != NULL) {
    111 		b = get_grbuf(1);
    112 		if (b == NULL)
    113 			return (NULL);
    114 		ret = getgrnam_r(nam, b->result, b->buffer, b->buflen);
    115 	}
    116 	return (ret);
    117 }
    118 
    119 struct group *
    120 getgrent(void)
    121 {
    122 	nss_XbyY_buf_t	*b = get_grbuf(1);
    123 
    124 	return (b == NULL ? NULL :
    125 	    getgrent_r(b->result, b->buffer, b->buflen));
    126 }
    127 
    128 struct group *
    129 fgetgrent(FILE *f)
    130 {
    131 	nss_XbyY_buf_t	*b = get_grbuf(1);
    132 
    133 	return (b == NULL ? NULL :
    134 	    fgetgrent_r(f, b->result, b->buffer, b->buflen));
    135 }
    136 
    137 #endif	/* NSS_INCLUDE_UNSAFE */
    138