336 lines
7.8 KiB
C
336 lines
7.8 KiB
C
/* $NetBSD: getgrent.c,v 1.12 2005/09/14 15:54:53 drochner Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1989, 1991, 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.
|
|
*/
|
|
|
|
/*
|
|
* Portions Copyright (c) 1994, Jason Downs. 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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 AUTHOR(S) 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.
|
|
*/
|
|
|
|
/*
|
|
* Copied from: lib/libc/gen/getgrent.c
|
|
* NetBSD: getgrent.c,v 1.46 2003/02/17 00:11:54 simonb Exp
|
|
* and then gutted, leaving only /etc/group support.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
|
|
#ifdef __weak_alias
|
|
#define endgrent _endgrent
|
|
#define getgrent _getgrent
|
|
#define getgrgid _getgrgid
|
|
#define getgrnam _getgrnam
|
|
#define getgrnam_r _getgrnam_r
|
|
#define setgrent _setgrent
|
|
#define setgroupent _setgroupent
|
|
#define getgrouplist _getgrouplist
|
|
|
|
__weak_alias(endgrent,_endgrent)
|
|
__weak_alias(getgrent,_getgrent)
|
|
__weak_alias(getgrgid,_getgrgid)
|
|
__weak_alias(getgrnam,_getgrnam)
|
|
__weak_alias(getgrnam_r,_getgrnam_r)
|
|
__weak_alias(setgrent,_setgrent)
|
|
__weak_alias(setgroupent,_setgroupent)
|
|
__weak_alias(getgrouplist,_getgrouplist)
|
|
#endif
|
|
|
|
#include <sys/param.h>
|
|
|
|
#include <grp.h>
|
|
#include <limits.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
|
|
static FILE *_gr_fp;
|
|
static struct group _gr_group;
|
|
static int _gr_stayopen;
|
|
static int _gr_filesdone;
|
|
|
|
static int grscan(int, gid_t, const char *, const char *);
|
|
static int grstart(void);
|
|
static int grmatchline(int, gid_t, const char *, const char *);
|
|
|
|
#define MAXGRP 200
|
|
#define MAXLINELENGTH 1024
|
|
|
|
static __aconst char *members[MAXGRP];
|
|
static char grline[MAXLINELENGTH];
|
|
|
|
struct group *
|
|
getgrent(void)
|
|
{
|
|
|
|
if ((!_gr_fp && !grstart()) || !grscan(0, 0, NULL, NULL))
|
|
return (NULL);
|
|
return &_gr_group;
|
|
}
|
|
|
|
int
|
|
getgrnam_r(const char *name, struct group *grp, char *buffer,
|
|
size_t buflen, struct group **result)
|
|
{
|
|
struct group *gp, *bgp;
|
|
|
|
/*
|
|
* We blatantly cheat (don't provide reentrancy)
|
|
* and hope to get away with it
|
|
*/
|
|
|
|
*result = NULL;
|
|
bgp = (struct group*)buffer;
|
|
if (buflen < sizeof(struct group))
|
|
return ENOMEM;
|
|
|
|
gp = getgrnam(name);
|
|
if (gp) {
|
|
*bgp = *gp;
|
|
*result = bgp;
|
|
}
|
|
|
|
return (gp) ? ENOENT : 0;
|
|
}
|
|
|
|
struct group *
|
|
getgrnam(const char *name)
|
|
{
|
|
int rval;
|
|
|
|
if (!grstart())
|
|
return NULL;
|
|
rval = grscan(1, 0, name, NULL);
|
|
if (!_gr_stayopen)
|
|
endgrent();
|
|
return (rval) ? &_gr_group : NULL;
|
|
}
|
|
|
|
struct group *
|
|
getgrgid(gid_t gid)
|
|
{
|
|
int rval;
|
|
|
|
if (!grstart())
|
|
return NULL;
|
|
rval = grscan(1, gid, NULL, NULL);
|
|
if (!_gr_stayopen)
|
|
endgrent();
|
|
return (rval) ? &_gr_group : NULL;
|
|
}
|
|
|
|
static int
|
|
grstart(void)
|
|
{
|
|
|
|
_gr_filesdone = 0;
|
|
if (_gr_fp) {
|
|
rewind(_gr_fp);
|
|
return 1;
|
|
}
|
|
return (_gr_fp = fopen(_PATH_GROUP, "r")) ? 1 : 0;
|
|
}
|
|
|
|
void
|
|
setgrent(void)
|
|
{
|
|
|
|
(void) setgroupent(0);
|
|
}
|
|
|
|
int
|
|
setgroupent(int stayopen)
|
|
{
|
|
|
|
if (!grstart())
|
|
return 0;
|
|
_gr_stayopen = stayopen;
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
endgrent(void)
|
|
{
|
|
|
|
_gr_filesdone = 0;
|
|
if (_gr_fp) {
|
|
(void)fclose(_gr_fp);
|
|
_gr_fp = NULL;
|
|
}
|
|
}
|
|
|
|
int
|
|
getgrouplist(const char *uname, gid_t agroup,
|
|
gid_t *groups, int *grpcnt)
|
|
{
|
|
struct group *grp;
|
|
int maxgroups, i, ngroups, ret;
|
|
|
|
maxgroups = *grpcnt;
|
|
ret = 0;
|
|
ngroups = 0;
|
|
|
|
/*
|
|
* install primary group
|
|
*/
|
|
if (ngroups < maxgroups)
|
|
groups[ngroups] = agroup;
|
|
else
|
|
ret = -1;
|
|
ngroups++;
|
|
|
|
/*
|
|
* Scan the group file to find additional groups.
|
|
*/
|
|
setgrent();
|
|
nextgroup:
|
|
while ((grp = getgrent()) != NULL) {
|
|
if (grp->gr_gid == agroup)
|
|
continue;
|
|
for (i = 0; grp->gr_mem[i]; i++) {
|
|
if (strcmp(grp->gr_mem[i], uname) != 0)
|
|
continue;
|
|
for (i = 0; i < MIN(ngroups, maxgroups); i++) {
|
|
if (grp->gr_gid == groups[i])
|
|
goto nextgroup;
|
|
}
|
|
if (ngroups < maxgroups)
|
|
groups[ngroups] = grp->gr_gid;
|
|
else
|
|
ret = -1;
|
|
ngroups++;
|
|
break;
|
|
}
|
|
}
|
|
endgrent();
|
|
*grpcnt = ngroups;
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
grscan(int search, gid_t gid, const char *name, const char *user)
|
|
{
|
|
|
|
if (_gr_filesdone)
|
|
return 0;
|
|
for (;;) {
|
|
if (!fgets(grline, sizeof(grline), _gr_fp)) {
|
|
if (!search)
|
|
_gr_filesdone = 1;
|
|
return 0;
|
|
}
|
|
/* skip lines that are too big */
|
|
if (!strchr(grline, '\n')) {
|
|
int ch;
|
|
|
|
while ((ch = getc(_gr_fp)) != '\n' && ch != EOF)
|
|
;
|
|
continue;
|
|
}
|
|
if (grmatchline(search, gid, name, user))
|
|
return 1;
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
static int
|
|
grmatchline(int search, gid_t gid, const char *name, const char *user)
|
|
{
|
|
unsigned long id;
|
|
__aconst char **m;
|
|
char *cp, *bp, *ep;
|
|
|
|
/* name may be NULL if search is nonzero */
|
|
|
|
bp = grline;
|
|
_gr_group.gr_name = strsep(&bp, ":\n");
|
|
if (search && name && strcmp(_gr_group.gr_name, name))
|
|
return 0;
|
|
_gr_group.gr_passwd = strsep(&bp, ":\n");
|
|
if (!(cp = strsep(&bp, ":\n")))
|
|
return 0;
|
|
id = strtoul(cp, &ep, 10);
|
|
if (id > GID_MAX || *ep != '\0')
|
|
return 0;
|
|
_gr_group.gr_gid = (gid_t)id;
|
|
if (search && name == NULL && _gr_group.gr_gid != gid)
|
|
return 0;
|
|
cp = NULL;
|
|
if (bp == NULL)
|
|
return 0;
|
|
for (_gr_group.gr_mem = m = members;; bp++) {
|
|
if (m == &members[MAXGRP - 1])
|
|
break;
|
|
if (*bp == ',') {
|
|
if (cp) {
|
|
*bp = '\0';
|
|
*m++ = cp;
|
|
cp = NULL;
|
|
}
|
|
} else if (*bp == '\0' || *bp == '\n' || *bp == ' ') {
|
|
if (cp) {
|
|
*bp = '\0';
|
|
*m++ = cp;
|
|
}
|
|
break;
|
|
} else if (cp == NULL)
|
|
cp = bp;
|
|
}
|
|
*m = NULL;
|
|
if (user) {
|
|
for (m = members; *m; m++)
|
|
if (!strcmp(user, *m))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|