ad4dda469f
This patch contains changes to NetBSD libc code base to make it compile and work on Minix. Some of them are due to actual NetBSD libc bugs, as we're compiling it in non-reentrant mode and with a.out support, something not exactly frequent in NetBSD. Others are proper fixes to port it to Minix (mostly sa_len parameter missing in socket and a few mmap from files).
429 lines
11 KiB
C
429 lines
11 KiB
C
/* $NetBSD: getgroupmembership.c,v 1.4 2008/04/28 20:22:59 martin Exp $ */
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/*-
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* Copyright (c) 2004-2005 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Luke Mewburn.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: getgroupmembership.c,v 1.4 2008/04/28 20:22:59 martin Exp $");
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#endif /* LIBC_SCCS and not lint */
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/*
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* calculate group access list
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*/
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#include "namespace.h"
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#include "reentrant.h"
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#include <sys/param.h>
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#include <assert.h>
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#include <errno.h>
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#include <grp.h>
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#include <limits.h>
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#include <nsswitch.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#ifdef HESIOD
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#include <hesiod.h>
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#endif
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#include "gr_private.h"
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#ifdef __weak_alias
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__weak_alias(getgroupmembership,_getgroupmembership)
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#endif
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/*
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* __gr_addgid
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* Add gid to the groups array (of maxgrp size) at the position
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* indicated by *groupc, unless it already exists or *groupc is
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* past &groups[maxgrp].
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* Returns 1 upon success (including duplicate suppression), 0 otherwise.
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*/
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static int
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__gr_addgid(gid_t gid, gid_t *groups, int maxgrp, int *groupc)
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{
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int ret, dupc;
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_DIAGASSERT(groupc != NULL);
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_DIAGASSERT(groups != NULL);
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/* skip duplicates */
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for (dupc = 0; dupc < MIN(maxgrp, *groupc); dupc++) {
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if (groups[dupc] == gid)
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return 1;
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}
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ret = 1;
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if (*groupc < maxgrp) /* add this gid */
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groups[*groupc] = gid;
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else
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ret = 0;
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(*groupc)++;
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return ret;
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}
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/*ARGSUSED*/
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static int
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_files_getgroupmembership(void *retval, void *cb_data, va_list ap)
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{
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int *result = va_arg(ap, int *);
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const char *uname = va_arg(ap, const char *);
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#ifdef __minix
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gid_t agroup = (gid_t)va_arg(ap, int);
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#else
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gid_t agroup = va_arg(ap, gid_t);
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#endif
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gid_t *groups = va_arg(ap, gid_t *);
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int maxgrp = va_arg(ap, int);
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int *groupc = va_arg(ap, int *);
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struct __grstate_files state;
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struct group grp;
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char grpbuf[_GETGR_R_SIZE_MAX];
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int rv, i;
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_DIAGASSERT(result != NULL);
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_DIAGASSERT(uname != NULL);
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/* groups may be NULL if just sizing when invoked with maxgrp = 0 */
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_DIAGASSERT(groupc != NULL);
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/* install primary group */
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(void) __gr_addgid(agroup, groups, maxgrp, groupc);
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memset(&state, 0, sizeof(state));
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while (__grscan_files(&rv, &grp, grpbuf, sizeof(grpbuf), &state,
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0, NULL, 0) == NS_SUCCESS) {
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/* scan members */
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for (i = 0; grp.gr_mem[i]; i++) {
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if (strcmp(grp.gr_mem[i], uname) != 0)
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continue;
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if (! __gr_addgid(grp.gr_gid, groups, maxgrp, groupc))
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*result = -1;
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break;
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}
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}
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__grend_files(&state);
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return NS_NOTFOUND;
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}
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#ifdef HESIOD
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/*ARGSUSED*/
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static int
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_dns_getgroupmembership(void *retval, void *cb_data, va_list ap)
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{
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int *result = va_arg(ap, int *);
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const char *uname = va_arg(ap, const char *);
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#ifdef __minix
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gid_t agroup = (gid_t)va_arg(ap, int);
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#else
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gid_t agroup = va_arg(ap, gid_t);
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#endif
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gid_t *groups = va_arg(ap, gid_t *);
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int maxgrp = va_arg(ap, int);
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int *groupc = va_arg(ap, int *);
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struct __grstate_dns state;
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struct group grp;
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char grpbuf[_GETGR_R_SIZE_MAX];
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unsigned long id;
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void *context;
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char **hp, *cp, *ep;
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int rv, i;
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_DIAGASSERT(result != NULL);
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_DIAGASSERT(uname != NULL);
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/* groups may be NULL if just sizing when invoked with maxgrp = 0 */
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_DIAGASSERT(groupc != NULL);
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/* install primary group */
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(void) __gr_addgid(agroup, groups, maxgrp, groupc);
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hp = NULL;
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rv = NS_NOTFOUND;
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if (hesiod_init(&context) == -1) /* setup hesiod */
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return NS_UNAVAIL;
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hp = hesiod_resolve(context, uname, "grplist"); /* find grplist */
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if (hp == NULL) {
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if (errno != ENOENT) { /* wasn't "not found"*/
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rv = NS_UNAVAIL;
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goto dnsgroupmembers_out;
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}
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/* grplist not found, fallback to _dns_grscan */
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memset(&state, 0, sizeof(state));
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while (__grscan_dns(&rv, &grp, grpbuf, sizeof(grpbuf), &state,
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0, NULL, 0) == NS_SUCCESS) {
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/* scan members */
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for (i = 0; grp.gr_mem[i]; i++) {
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if (strcmp(grp.gr_mem[i], uname) != 0)
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continue;
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if (! __gr_addgid(grp.gr_gid, groups, maxgrp,
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groupc))
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*result = -1;
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break;
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}
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}
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__grend_dns(&state);
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rv = NS_NOTFOUND;
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goto dnsgroupmembers_out;
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}
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if ((ep = strchr(hp[0], '\n')) != NULL)
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*ep = '\0'; /* clear trailing \n */
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for (cp = hp[0]; *cp != '\0'; ) { /* parse grplist */
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if ((cp = strchr(cp, ':')) == NULL) /* skip grpname */
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break;
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cp++;
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id = strtoul(cp, &ep, 10); /* parse gid */
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if (id > GID_MAX || (*ep != ':' && *ep != '\0')) {
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rv = NS_UNAVAIL;
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goto dnsgroupmembers_out;
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}
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cp = ep;
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if (*cp == ':')
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cp++;
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/* add gid */
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if (! __gr_addgid((gid_t)id, groups, maxgrp, groupc))
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*result = -1;
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}
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rv = NS_NOTFOUND;
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dnsgroupmembers_out:
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if (hp)
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hesiod_free_list(context, hp);
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hesiod_end(context);
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return rv;
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}
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#endif /* HESIOD */
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#ifdef YP
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/*ARGSUSED*/
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static int
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_nis_getgroupmembership(void *retval, void *cb_data, va_list ap)
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{
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int *result = va_arg(ap, int *);
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const char *uname = va_arg(ap, const char *);
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#ifdef __minix
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gid_t agroup = (gid_t)va_arg(ap, int);
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#else
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gid_t agroup = va_arg(ap, gid_t);
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#endif
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gid_t *groups = va_arg(ap, gid_t *);
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int maxgrp = va_arg(ap, int);
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int *groupc = va_arg(ap, int *);
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struct __grstate_nis state;
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struct group grp;
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char grpbuf[_GETGR_R_SIZE_MAX];
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int rv, i;
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_DIAGASSERT(result != NULL);
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_DIAGASSERT(uname != NULL);
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/* groups may be NULL if just sizing when invoked with maxgrp = 0 */
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_DIAGASSERT(groupc != NULL);
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/* install primary group */
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(void) __gr_addgid(agroup, groups, maxgrp, groupc);
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memset(&state, 0, sizeof(state));
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while (__grscan_nis(&rv, &grp, grpbuf, sizeof(grpbuf), &state,
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0, NULL, 0) == NS_SUCCESS) {
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/* scan members */
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for (i = 0; grp.gr_mem[i]; i++) {
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if (strcmp(grp.gr_mem[i], uname) != 0)
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continue;
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if (! __gr_addgid(grp.gr_gid, groups, maxgrp, groupc))
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*result = -1;
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break;
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}
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}
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__grend_nis(&state);
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return NS_NOTFOUND;
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}
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#endif /* YP */
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#ifdef _GROUP_COMPAT
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struct __compatggm {
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const char *uname; /* user to search for */
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gid_t *groups;
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gid_t agroup;
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int maxgrp;
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int *groupc;
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};
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static int
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_compat_ggm_search(void *cookie, struct group **groupres)
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{
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struct __compatggm *cp;
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int rerror, crv;
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static const ns_dtab dtab[] = {
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NS_FILES_CB(__grbad_compat, "files")
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NS_DNS_CB(_dns_getgroupmembership, NULL)
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NS_NIS_CB(_nis_getgroupmembership, NULL)
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NS_COMPAT_CB(__grbad_compat, "compat")
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NS_NULL_CB
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};
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*groupres = NULL; /* we don't care about this */
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cp = (struct __compatggm *)cookie;
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crv = nsdispatch(NULL, dtab,
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NSDB_GROUP_COMPAT, "getgroupmembership",
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__nsdefaultnis,
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#ifdef __minix
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&rerror, cp->uname, (int)cp->agroup, cp->groups, cp->maxgrp, cp->groupc);
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#else
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&rerror, cp->uname, cp->agroup, cp->groups, cp->maxgrp, cp->groupc);
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#endif
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if (crv == NS_SUCCESS)
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crv = NS_NOTFOUND; /* indicate "no more +: entries" */
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return crv;
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}
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/* ARGSUSED */
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static int
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_compat_getgroupmembership(void *retval, void *cb_data, va_list ap)
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{
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int *result = va_arg(ap, int *);
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const char *uname = va_arg(ap, const char *);
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#ifdef __minix
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gid_t agroup = (gid_t)va_arg(ap, int);
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#else
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gid_t agroup = va_arg(ap, gid_t);
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#endif
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gid_t *groups = va_arg(ap, gid_t *);
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int maxgrp = va_arg(ap, int);
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int *groupc = va_arg(ap, int *);
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struct __grstate_compat state;
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struct __compatggm ggmstate;
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struct group grp;
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char grpbuf[_GETGR_R_SIZE_MAX];
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int rv, i;
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_DIAGASSERT(result != NULL);
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_DIAGASSERT(uname != NULL);
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/* groups may be NULL if just sizing when invoked with maxgrp = 0 */
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_DIAGASSERT(groupc != NULL);
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/* install primary group */
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(void) __gr_addgid(agroup, groups, maxgrp, groupc);
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memset(&state, 0, sizeof(state));
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memset(&ggmstate, 0, sizeof(ggmstate));
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ggmstate.uname = uname;
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ggmstate.groups = groups;
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ggmstate.agroup = agroup;
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ggmstate.maxgrp = maxgrp;
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ggmstate.groupc = groupc;
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while (__grscan_compat(&rv, &grp, grpbuf, sizeof(grpbuf), &state,
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0, NULL, 0, _compat_ggm_search, &ggmstate)
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== NS_SUCCESS) {
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/* scan members */
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for (i = 0; grp.gr_mem[i]; i++) {
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if (strcmp(grp.gr_mem[i], uname) != 0)
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continue;
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if (! __gr_addgid(grp.gr_gid, groups, maxgrp, groupc))
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*result = -1;
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break;
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}
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}
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__grend_compat(&state);
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return NS_NOTFOUND;
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}
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#endif /* _GROUP_COMPAT */
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int
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getgroupmembership(const char *uname, gid_t agroup,
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gid_t *groups, int maxgrp, int *groupc)
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{
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int rerror;
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static const ns_dtab dtab[] = {
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NS_FILES_CB(_files_getgroupmembership, NULL)
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NS_DNS_CB(_dns_getgroupmembership, NULL)
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NS_NIS_CB(_nis_getgroupmembership, NULL)
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NS_COMPAT_CB(_compat_getgroupmembership, NULL)
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NS_NULL_CB
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};
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_DIAGASSERT(uname != NULL);
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/* groups may be NULL if just sizing when invoked with maxgrp = 0 */
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_DIAGASSERT(groupc != NULL);
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*groupc = 0;
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mutex_lock(&__grmutex);
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/*
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* Call each backend.
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* For compatibility with getgrent(3) semantics,
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* a backend should return NS_NOTFOUND even upon
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* completion, to allow result merging to occur.
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*/
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(void) nsdispatch(NULL, dtab, NSDB_GROUP, "getgroupmembership",
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__nsdefaultcompat,
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#ifdef __minix
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&rerror, uname, (int)agroup, groups, maxgrp, groupc);
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#else
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&rerror, uname, agroup, groups, maxgrp, groupc);
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#endif
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mutex_unlock(&__grmutex);
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if (*groupc > maxgrp) /* too many groups found */
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return -1;
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else
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return 0;
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}
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