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Commit	Line	Data
	1	/* $OpenBSD: pwcache.c,v 1.9 2005/08/08 08:05:34 espie Exp $ */
	2	/*
	3	* Copyright (c) 1989, 1993
	4	* The Regents of the University of California. All rights reserved.
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions and the following disclaimer.
	11	* 2. Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
	14	* 3. Neither the name of the University nor the names of its contributors
	15	* may be used to endorse or promote products derived from this software
	16	* without specific prior written permission.
	17	*
	18	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	19	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	20	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	21	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	22	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	23	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	24	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	25	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	26	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	27	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	28	* SUCH DAMAGE.
	29	*/
	30
	31	/* OPENBSD ORIGINAL: lib/libc/gen/pwcache.c */
	32
	33	#include "includes.h"
	34
	35	#include <sys/types.h>
	36
	37	#include <grp.h>
	38	#include <pwd.h>
	39	#include <stdio.h>
	40	#include <stdlib.h>
	41	#include <string.h>
	42
	43	#define NCACHE 64 /* power of 2 */
	44	#define MASK (NCACHE - 1) /* bits to store with */
	45
	46	#ifndef HAVE_USER_FROM_UID
	47	char *
	48	user_from_uid(uid_t uid, int nouser)
	49	{
	50	static struct ncache {
	51	uid_t uid;
	52	char *name;
	53	} c_uid[NCACHE];
	54	static int pwopen;
	55	static char nbuf[15]; /* 32 bits == 10 digits */
	56	struct passwd *pw;
	57	struct ncache *cp;
	58
	59	cp = c_uid + (uid & MASK);
	60	if (cp->uid != uid \|\| cp->name == NULL) {
	61	if (pwopen == 0) {
	62	#ifdef HAVE_SETPASSENT
	63	setpassent(1);
	64	#endif
	65	pwopen = 1;
	66	}
	67	if ((pw = getpwuid(uid)) == NULL) {
	68	if (nouser)
	69	return (NULL);
	70	(void)snprintf(nbuf, sizeof(nbuf), "%u", uid);
	71	}
	72	cp->uid = uid;
	73	if (cp->name != NULL)
	74	free(cp->name);
	75	cp->name = strdup(pw ? pw->pw_name : nbuf);
	76	}
	77	return (cp->name);
	78	}
	79	#endif
	80
	81	#ifndef HAVE_GROUP_FROM_GID
	82	char *
	83	group_from_gid(gid_t gid, int nogroup)
	84	{
	85	static struct ncache {
	86	gid_t gid;
	87	char *name;
	88	} c_gid[NCACHE];
	89	static int gropen;
	90	static char nbuf[15]; /* 32 bits == 10 digits */
	91	struct group *gr;
	92	struct ncache *cp;
	93
	94	cp = c_gid + (gid & MASK);
	95	if (cp->gid != gid \|\| cp->name == NULL) {
	96	if (gropen == 0) {
	97	#ifdef HAVE_SETGROUPENT
	98	setgroupent(1);
	99	#endif
	100	gropen = 1;
	101	}
	102	if ((gr = getgrgid(gid)) == NULL) {
	103	if (nogroup)
	104	return (NULL);
	105	(void)snprintf(nbuf, sizeof(nbuf), "%u", gid);
	106	}
	107	cp->gid = gid;
	108	if (cp->name != NULL)
	109	free(cp->name);
	110	cp->name = strdup(gr ? gr->gr_name : nbuf);
	111	}
	112	return (cp->name);
	113	}
	114	#endif