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/* Copyright (C) 2004-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2004.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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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 <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <not-cancel.h>
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#include "nscd-client.h"
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#include "nscd_proto.h"
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/* We use the same mapping as in nscd_getgr. */
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libc_locked_map_ptr (extern, __gr_map_handle) attribute_hidden;
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int
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__nscd_getgrouplist (const char *user, gid_t group, long int *size,
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gid_t **groupsp, long int limit)
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{
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size_t userlen = strlen (user) + 1;
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int gc_cycle;
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int nretries = 0;
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/* If the mapping is available, try to search there instead of
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communicating with the nscd. */
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struct mapped_database *mapped;
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mapped = __nscd_get_map_ref (GETFDGR, "group", &__gr_map_handle, &gc_cycle);
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retry:;
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char *respdata = NULL;
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int retval = -1;
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int sock = -1;
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initgr_response_header initgr_resp;
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if (mapped != NO_MAPPING)
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{
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struct datahead *found = __nscd_cache_search (INITGROUPS, user,
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userlen, mapped,
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sizeof initgr_resp);
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if (found != NULL)
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{
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respdata = (char *) (&found->data[0].initgrdata + 1);
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initgr_resp = found->data[0].initgrdata;
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char *recend = (char *) found->data + found->recsize;
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/* Now check if we can trust initgr_resp fields. If GC is
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in progress, it can contain anything. */
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if (mapped->head->gc_cycle != gc_cycle)
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{
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retval = -2;
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goto out;
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}
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if (respdata + initgr_resp.ngrps * sizeof (int32_t) > recend)
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goto out;
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}
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}
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/* If we do not have the cache mapped, try to get the data over the
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socket. */
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if (respdata == NULL)
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{
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sock = __nscd_open_socket (user, userlen, INITGROUPS, &initgr_resp,
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sizeof (initgr_resp));
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if (sock == -1)
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{
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/* nscd not running or wrong version. */
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__nss_not_use_nscd_group = 1;
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goto out;
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}
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}
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if (initgr_resp.found == 1)
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{
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/* The following code assumes that gid_t and int32_t are the
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same size. This is the case for al existing implementation.
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If this should change some code needs to be added which
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doesn't use memcpy but instead copies each array element one
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by one. */
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assert (sizeof (int32_t) == sizeof (gid_t));
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assert (initgr_resp.ngrps >= 0);
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/* Make sure we have enough room. We always count GROUP in even
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though we might not end up adding it. */
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if (*size < initgr_resp.ngrps + 1)
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{
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gid_t *newp = realloc (*groupsp,
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(initgr_resp.ngrps + 1) * sizeof (gid_t));
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if (newp == NULL)
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/* We cannot increase the buffer size. */
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goto out_close;
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*groupsp = newp;
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*size = initgr_resp.ngrps + 1;
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}
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if (respdata == NULL)
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{
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/* Read the data from the socket. */
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if ((size_t) __readall (sock, *groupsp, initgr_resp.ngrps
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* sizeof (gid_t))
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== initgr_resp.ngrps * sizeof (gid_t))
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retval = initgr_resp.ngrps;
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}
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else
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{
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/* Just copy the data. */
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retval = initgr_resp.ngrps;
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memcpy (*groupsp, respdata, retval * sizeof (gid_t));
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}
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}
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else
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{
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if (__glibc_unlikely (initgr_resp.found == -1))
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{
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/* The daemon does not cache this database. */
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__nss_not_use_nscd_group = 1;
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goto out_close;
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}
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/* No group found yet. */
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retval = 0;
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assert (*size >= 1);
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}
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/* Check whether GROUP is part of the mix. If not, add it. */
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if (retval >= 0)
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{
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int cnt;
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for (cnt = 0; cnt < retval; ++cnt)
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if ((*groupsp)[cnt] == group)
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break;
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if (cnt == retval)
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(*groupsp)[retval++] = group;
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}
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out_close:
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if (sock != -1)
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__close_nocancel_nostatus (sock);
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out:
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if (__nscd_drop_map_ref (mapped, &gc_cycle) != 0)
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{
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/* When we come here this means there has been a GC cycle while we
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were looking for the data. This means the data might have been
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inconsistent. Retry if possible. */
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if ((gc_cycle & 1) != 0 || ++nretries == 5 || retval == -1)
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{
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/* nscd is just running gc now. Disable using the mapping. */
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if (atomic_decrement_val (&mapped->counter) == 0)
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__nscd_unmap (mapped);
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mapped = NO_MAPPING;
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}
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if (retval != -1)
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goto retry;
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}
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return retval;
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}
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