minix/lib/libc/gen/getgroupmembership.c
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

406 lines
10 KiB
C

/* $NetBSD: getgroupmembership.c,v 1.4 2008/04/28 20:22:59 martin Exp $ */
/*-
* Copyright (c) 2004-2005 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Luke Mewburn.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: getgroupmembership.c,v 1.4 2008/04/28 20:22:59 martin Exp $");
#endif /* LIBC_SCCS and not lint */
/*
* calculate group access list
*/
#include "namespace.h"
#include "reentrant.h"
#include <sys/param.h>
#include <assert.h>
#include <errno.h>
#include <grp.h>
#include <limits.h>
#include <nsswitch.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef HESIOD
#include <hesiod.h>
#endif
#include "gr_private.h"
#ifdef __weak_alias
__weak_alias(getgroupmembership,_getgroupmembership)
#endif
/*
* __gr_addgid
* Add gid to the groups array (of maxgrp size) at the position
* indicated by *groupc, unless it already exists or *groupc is
* past &groups[maxgrp].
* Returns 1 upon success (including duplicate suppression), 0 otherwise.
*/
static int
__gr_addgid(gid_t gid, gid_t *groups, int maxgrp, int *groupc)
{
int ret, dupc;
_DIAGASSERT(groupc != NULL);
_DIAGASSERT(groups != NULL);
/* skip duplicates */
for (dupc = 0; dupc < MIN(maxgrp, *groupc); dupc++) {
if (groups[dupc] == gid)
return 1;
}
ret = 1;
if (*groupc < maxgrp) /* add this gid */
groups[*groupc] = gid;
else
ret = 0;
(*groupc)++;
return ret;
}
/*ARGSUSED*/
static int
_files_getgroupmembership(void *retval, void *cb_data, va_list ap)
{
int *result = va_arg(ap, int *);
const char *uname = va_arg(ap, const char *);
gid_t agroup = va_arg(ap, gid_t);
gid_t *groups = va_arg(ap, gid_t *);
int maxgrp = va_arg(ap, int);
int *groupc = va_arg(ap, int *);
struct __grstate_files state;
struct group grp;
char grpbuf[_GETGR_R_SIZE_MAX];
int rv, i;
_DIAGASSERT(result != NULL);
_DIAGASSERT(uname != NULL);
/* groups may be NULL if just sizing when invoked with maxgrp = 0 */
_DIAGASSERT(groupc != NULL);
/* install primary group */
(void) __gr_addgid(agroup, groups, maxgrp, groupc);
memset(&state, 0, sizeof(state));
while (__grscan_files(&rv, &grp, grpbuf, sizeof(grpbuf), &state,
0, NULL, 0) == NS_SUCCESS) {
/* scan members */
for (i = 0; grp.gr_mem[i]; i++) {
if (strcmp(grp.gr_mem[i], uname) != 0)
continue;
if (! __gr_addgid(grp.gr_gid, groups, maxgrp, groupc))
*result = -1;
break;
}
}
__grend_files(&state);
return NS_NOTFOUND;
}
#ifdef HESIOD
/*ARGSUSED*/
static int
_dns_getgroupmembership(void *retval, void *cb_data, va_list ap)
{
int *result = va_arg(ap, int *);
const char *uname = va_arg(ap, const char *);
gid_t agroup = va_arg(ap, gid_t);
gid_t *groups = va_arg(ap, gid_t *);
int maxgrp = va_arg(ap, int);
int *groupc = va_arg(ap, int *);
struct __grstate_dns state;
struct group grp;
char grpbuf[_GETGR_R_SIZE_MAX];
unsigned long id;
void *context;
char **hp, *cp, *ep;
int rv, i;
_DIAGASSERT(result != NULL);
_DIAGASSERT(uname != NULL);
/* groups may be NULL if just sizing when invoked with maxgrp = 0 */
_DIAGASSERT(groupc != NULL);
/* install primary group */
(void) __gr_addgid(agroup, groups, maxgrp, groupc);
hp = NULL;
rv = NS_NOTFOUND;
if (hesiod_init(&context) == -1) /* setup hesiod */
return NS_UNAVAIL;
hp = hesiod_resolve(context, uname, "grplist"); /* find grplist */
if (hp == NULL) {
if (errno != ENOENT) { /* wasn't "not found"*/
rv = NS_UNAVAIL;
goto dnsgroupmembers_out;
}
/* grplist not found, fallback to _dns_grscan */
memset(&state, 0, sizeof(state));
while (__grscan_dns(&rv, &grp, grpbuf, sizeof(grpbuf), &state,
0, NULL, 0) == NS_SUCCESS) {
/* scan members */
for (i = 0; grp.gr_mem[i]; i++) {
if (strcmp(grp.gr_mem[i], uname) != 0)
continue;
if (! __gr_addgid(grp.gr_gid, groups, maxgrp,
groupc))
*result = -1;
break;
}
}
__grend_dns(&state);
rv = NS_NOTFOUND;
goto dnsgroupmembers_out;
}
if ((ep = strchr(hp[0], '\n')) != NULL)
*ep = '\0'; /* clear trailing \n */
for (cp = hp[0]; *cp != '\0'; ) { /* parse grplist */
if ((cp = strchr(cp, ':')) == NULL) /* skip grpname */
break;
cp++;
id = strtoul(cp, &ep, 10); /* parse gid */
if (id > GID_MAX || (*ep != ':' && *ep != '\0')) {
rv = NS_UNAVAIL;
goto dnsgroupmembers_out;
}
cp = ep;
if (*cp == ':')
cp++;
/* add gid */
if (! __gr_addgid((gid_t)id, groups, maxgrp, groupc))
*result = -1;
}
rv = NS_NOTFOUND;
dnsgroupmembers_out:
if (hp)
hesiod_free_list(context, hp);
hesiod_end(context);
return rv;
}
#endif /* HESIOD */
#ifdef YP
/*ARGSUSED*/
static int
_nis_getgroupmembership(void *retval, void *cb_data, va_list ap)
{
int *result = va_arg(ap, int *);
const char *uname = va_arg(ap, const char *);
gid_t agroup = va_arg(ap, gid_t);
gid_t *groups = va_arg(ap, gid_t *);
int maxgrp = va_arg(ap, int);
int *groupc = va_arg(ap, int *);
struct __grstate_nis state;
struct group grp;
char grpbuf[_GETGR_R_SIZE_MAX];
int rv, i;
_DIAGASSERT(result != NULL);
_DIAGASSERT(uname != NULL);
/* groups may be NULL if just sizing when invoked with maxgrp = 0 */
_DIAGASSERT(groupc != NULL);
/* install primary group */
(void) __gr_addgid(agroup, groups, maxgrp, groupc);
memset(&state, 0, sizeof(state));
while (__grscan_nis(&rv, &grp, grpbuf, sizeof(grpbuf), &state,
0, NULL, 0) == NS_SUCCESS) {
/* scan members */
for (i = 0; grp.gr_mem[i]; i++) {
if (strcmp(grp.gr_mem[i], uname) != 0)
continue;
if (! __gr_addgid(grp.gr_gid, groups, maxgrp, groupc))
*result = -1;
break;
}
}
__grend_nis(&state);
return NS_NOTFOUND;
}
#endif /* YP */
#ifdef _GROUP_COMPAT
struct __compatggm {
const char *uname; /* user to search for */
gid_t *groups;
gid_t agroup;
int maxgrp;
int *groupc;
};
static int
_compat_ggm_search(void *cookie, struct group **groupres)
{
struct __compatggm *cp;
int rerror, crv;
static const ns_dtab dtab[] = {
NS_FILES_CB(__grbad_compat, "files")
NS_DNS_CB(_dns_getgroupmembership, NULL)
NS_NIS_CB(_nis_getgroupmembership, NULL)
NS_COMPAT_CB(__grbad_compat, "compat")
NS_NULL_CB
};
*groupres = NULL; /* we don't care about this */
cp = (struct __compatggm *)cookie;
crv = nsdispatch(NULL, dtab,
NSDB_GROUP_COMPAT, "getgroupmembership",
__nsdefaultnis,
&rerror, cp->uname, cp->agroup, cp->groups, cp->maxgrp, cp->groupc);
if (crv == NS_SUCCESS)
crv = NS_NOTFOUND; /* indicate "no more +: entries" */
return crv;
}
/* ARGSUSED */
static int
_compat_getgroupmembership(void *retval, void *cb_data, va_list ap)
{
int *result = va_arg(ap, int *);
const char *uname = va_arg(ap, const char *);
gid_t agroup = va_arg(ap, gid_t);
gid_t *groups = va_arg(ap, gid_t *);
int maxgrp = va_arg(ap, int);
int *groupc = va_arg(ap, int *);
struct __grstate_compat state;
struct __compatggm ggmstate;
struct group grp;
char grpbuf[_GETGR_R_SIZE_MAX];
int rv, i;
_DIAGASSERT(result != NULL);
_DIAGASSERT(uname != NULL);
/* groups may be NULL if just sizing when invoked with maxgrp = 0 */
_DIAGASSERT(groupc != NULL);
/* install primary group */
(void) __gr_addgid(agroup, groups, maxgrp, groupc);
memset(&state, 0, sizeof(state));
memset(&ggmstate, 0, sizeof(ggmstate));
ggmstate.uname = uname;
ggmstate.groups = groups;
ggmstate.agroup = agroup;
ggmstate.maxgrp = maxgrp;
ggmstate.groupc = groupc;
while (__grscan_compat(&rv, &grp, grpbuf, sizeof(grpbuf), &state,
0, NULL, 0, _compat_ggm_search, &ggmstate)
== NS_SUCCESS) {
/* scan members */
for (i = 0; grp.gr_mem[i]; i++) {
if (strcmp(grp.gr_mem[i], uname) != 0)
continue;
if (! __gr_addgid(grp.gr_gid, groups, maxgrp, groupc))
*result = -1;
break;
}
}
__grend_compat(&state);
return NS_NOTFOUND;
}
#endif /* _GROUP_COMPAT */
int
getgroupmembership(const char *uname, gid_t agroup,
gid_t *groups, int maxgrp, int *groupc)
{
int rerror;
static const ns_dtab dtab[] = {
NS_FILES_CB(_files_getgroupmembership, NULL)
NS_DNS_CB(_dns_getgroupmembership, NULL)
NS_NIS_CB(_nis_getgroupmembership, NULL)
NS_COMPAT_CB(_compat_getgroupmembership, NULL)
NS_NULL_CB
};
_DIAGASSERT(uname != NULL);
/* groups may be NULL if just sizing when invoked with maxgrp = 0 */
_DIAGASSERT(groupc != NULL);
*groupc = 0;
mutex_lock(&__grmutex);
/*
* Call each backend.
* For compatibility with getgrent(3) semantics,
* a backend should return NS_NOTFOUND even upon
* completion, to allow result merging to occur.
*/
(void) nsdispatch(NULL, dtab, NSDB_GROUP, "getgroupmembership",
__nsdefaultcompat,
&rerror, uname, agroup, groups, maxgrp, groupc);
mutex_unlock(&__grmutex);
if (*groupc > maxgrp) /* too many groups found */
return -1;
else
return 0;
}