[openssh.git] / openbsd-compat / pwcache.c

/*	$OpenBSD: pwcache.c,v 1.9 2005/08/08 08:05:34 espie Exp $ */
/*
 * Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/* OPENBSD ORIGINAL: lib/libc/gen/pwcache.c */

#include "includes.h"

#include <sys/types.h>

#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define	NCACHE	64			/* power of 2 */
#define	MASK	(NCACHE - 1)		/* bits to store with */

#ifndef HAVE_USER_FROM_UID
char *
user_from_uid(uid_t uid, int nouser)
{
	static struct ncache {
		uid_t	uid;
		char	*name;
	} c_uid[NCACHE];
	static int pwopen;
	static char nbuf[15];		/* 32 bits == 10 digits */
	struct passwd *pw;
	struct ncache *cp;

	cp = c_uid + (uid & MASK);
	if (cp->uid != uid || cp->name == NULL) {
		if (pwopen == 0) {
#ifdef HAVE_SETPASSENT
			setpassent(1);
#endif
			pwopen = 1;
		}
		if ((pw = getpwuid(uid)) == NULL) {
			if (nouser)
				return (NULL);
			(void)snprintf(nbuf, sizeof(nbuf), "%u", uid);
		}
		cp->uid = uid;
		if (cp->name != NULL)
			free(cp->name);
		cp->name = strdup(pw ? pw->pw_name : nbuf);
	}
	return (cp->name);
}
#endif

#ifndef HAVE_GROUP_FROM_GID
char *
group_from_gid(gid_t gid, int nogroup)
{
	static struct ncache {
		gid_t	gid;
		char	*name;
	} c_gid[NCACHE];
	static int gropen;
	static char nbuf[15];		/* 32 bits == 10 digits */
	struct group *gr;
	struct ncache *cp;

	cp = c_gid + (gid & MASK);
	if (cp->gid != gid || cp->name == NULL) {
		if (gropen == 0) {
#ifdef HAVE_SETGROUPENT
			setgroupent(1);
#endif
			gropen = 1;
		}
		if ((gr = getgrgid(gid)) == NULL) {
			if (nogroup)
				return (NULL);
			(void)snprintf(nbuf, sizeof(nbuf), "%u", gid);
		}
		cp->gid = gid;
		if (cp->name != NULL)
			free(cp->name);
		cp->name = strdup(gr ? gr->gr_name : nbuf);
	}
	return (cp->name);
}
#endif
Commit	Line	Data
e45b6d40	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
2dec25c9	31	/* OPENBSD ORIGINAL: lib/libc/gen/pwcache.c */
2dec25c9	32
2e6adf75	33	#include "includes.h"
2e6adf75	34
e45b6d40	35	#include <sys/types.h>
	36
	37	#include <grp.h>
	38	#include <pwd.h>
	39	#include <stdio.h>
2dec25c9	40	#include <stdlib.h>
e45b6d40	41	#include <string.h>
	42
	43	#define NCACHE 64 /* power of 2 */
	44	#define MASK (NCACHE - 1) /* bits to store with */
	45
2dec25c9	46	#ifndef HAVE_USER_FROM_UID
e45b6d40	47	char *
	48	user_from_uid(uid_t uid, int nouser)
	49	{
	50	static struct ncache {
	51	uid_t uid;
2dec25c9	52	char *name;
e45b6d40	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);
2dec25c9	60	if (cp->uid != uid \|\| cp->name == NULL) {
e45b6d40	61	if (pwopen == 0) {
6bcd3709	62	#ifdef HAVE_SETPASSENT
e45b6d40	63	setpassent(1);
6bcd3709	64	#endif
e45b6d40	65	pwopen = 1;
	66	}
	67	if ((pw = getpwuid(uid)) == NULL) {
	68	if (nouser)
	69	return (NULL);
	70	(void)snprintf(nbuf, sizeof(nbuf), "%u", uid);
e45b6d40	71	}
e45b6d40	72	cp->uid = uid;
2dec25c9	73	if (cp->name != NULL)
	74	free(cp->name);
	75	cp->name = strdup(pw ? pw->pw_name : nbuf);
e45b6d40	76	}
	77	return (cp->name);
	78	}
2dec25c9	79	#endif
e45b6d40	80
2dec25c9	81	#ifndef HAVE_GROUP_FROM_GID
e45b6d40	82	char *
	83	group_from_gid(gid_t gid, int nogroup)
	84	{
	85	static struct ncache {
	86	gid_t gid;
2dec25c9	87	char *name;
e45b6d40	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);
2dec25c9	95	if (cp->gid != gid \|\| cp->name == NULL) {
e45b6d40	96	if (gropen == 0) {
6bcd3709	97	#ifdef HAVE_SETGROUPENT
e45b6d40	98	setgroupent(1);
6bcd3709	99	#endif
e45b6d40	100	gropen = 1;
	101	}
	102	if ((gr = getgrgid(gid)) == NULL) {
	103	if (nogroup)
	104	return (NULL);
	105	(void)snprintf(nbuf, sizeof(nbuf), "%u", gid);
e45b6d40	106	}
e45b6d40	107	cp->gid = gid;
2dec25c9	108	if (cp->name != NULL)
	109	free(cp->name);
	110	cp->name = strdup(gr ? gr->gr_name : nbuf);
e45b6d40	111	}
	112	return (cp->name);
	113	}
2dec25c9	114	#endif