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/* Cache handling for host lookup.
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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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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published
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6c4009 |
by the Free Software Foundation; version 2 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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6c4009 |
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You should have received a copy of the GNU General Public License
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6c4009 |
along with this program; if not, see <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 <libintl.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <scratch_buffer.h>
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#include <config.h>
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#include "dbg_log.h"
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#include "nscd.h"
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#include "../nss/nsswitch.h"
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#ifdef LINK_OBSOLETE_NSL
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# define DEFAULT_CONFIG "compat [NOTFOUND=return] files"
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#else
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# define DEFAULT_CONFIG "files"
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#endif
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/* Type of the lookup function. */
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typedef enum nss_status (*initgroups_dyn_function) (const char *, gid_t,
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long int *, long int *,
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gid_t **, long int, int *);
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static const initgr_response_header notfound =
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{
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.version = NSCD_VERSION,
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.found = 0,
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.ngrps = 0
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};
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#include "../grp/compat-initgroups.c"
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static time_t
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addinitgroupsX (struct database_dyn *db, int fd, request_header *req,
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void *key, uid_t uid, struct hashentry *const he,
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struct datahead *dh)
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{
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/* Search for the entry matching the key. Please note that we don't
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look again in the table whether the dataset is now available. We
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simply insert it. It does not matter if it is in there twice. The
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pruning function only will look at the timestamp. */
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/* We allocate all data in one memory block: the iov vector,
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the response header and the dataset itself. */
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struct dataset
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{
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struct datahead head;
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initgr_response_header resp;
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char strdata[0];
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} *dataset = NULL;
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if (__glibc_unlikely (debug_level > 0))
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{
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if (he == NULL)
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dbg_log (_("Haven't found \"%s\" in group cache!"), (char *) key);
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else
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dbg_log (_("Reloading \"%s\" in group cache!"), (char *) key);
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}
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static service_user *group_database;
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service_user *nip;
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int no_more;
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if (group_database == NULL)
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no_more = __nss_database_lookup2 ("group", NULL, DEFAULT_CONFIG,
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07d7e8 |
&group_database);
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else
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no_more = 0;
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nip = group_database;
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/* We always use sysconf even if NGROUPS_MAX is defined. That way, the
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limit can be raised in the kernel configuration without having to
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recompile libc. */
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long int limit = __sysconf (_SC_NGROUPS_MAX);
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long int size;
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if (limit > 0)
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/* We limit the size of the intially allocated array. */
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size = MIN (limit, 64);
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else
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/* No fixed limit on groups. Pick a starting buffer size. */
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size = 16;
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long int start = 0;
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bool all_tryagain = true;
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bool any_success = false;
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/* This is temporary memory, we need not (and must not) call
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mempool_alloc. */
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// XXX This really should use alloca. need to change the backends.
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gid_t *groups = (gid_t *) malloc (size * sizeof (gid_t));
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if (__glibc_unlikely (groups == NULL))
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/* No more memory. */
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goto out;
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/* Nothing added yet. */
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while (! no_more)
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{
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long int prev_start = start;
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enum nss_status status;
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initgroups_dyn_function fct;
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fct = __nss_lookup_function (nip, "initgroups_dyn");
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if (fct == NULL)
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{
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status = compat_call (nip, key, -1, &start, &size, &groups,
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limit, &errno);
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if (nss_next_action (nip, NSS_STATUS_UNAVAIL) != NSS_ACTION_CONTINUE)
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break;
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}
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else
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status = DL_CALL_FCT (fct, (key, -1, &start, &size, &groups,
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limit, &errno));
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/* Remove duplicates. */
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long int cnt = prev_start;
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while (cnt < start)
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{
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long int inner;
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for (inner = 0; inner < prev_start; ++inner)
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if (groups[inner] == groups[cnt])
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break;
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if (inner < prev_start)
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groups[cnt] = groups[--start];
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else
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++cnt;
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}
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if (status != NSS_STATUS_TRYAGAIN)
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all_tryagain = false;
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/* This is really only for debugging. */
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if (NSS_STATUS_TRYAGAIN > status || status > NSS_STATUS_RETURN)
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__libc_fatal ("Illegal status in internal_getgrouplist.\n");
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any_success |= status == NSS_STATUS_SUCCESS;
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if (status != NSS_STATUS_SUCCESS
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&& nss_next_action (nip, status) == NSS_ACTION_RETURN)
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break;
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if (nip->next == NULL)
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no_more = -1;
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else
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nip = nip->next;
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}
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bool all_written;
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ssize_t total;
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time_t timeout;
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out:
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all_written = true;
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timeout = MAX_TIMEOUT_VALUE;
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if (!any_success)
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{
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/* Nothing found. Create a negative result record. */
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total = sizeof (notfound);
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if (he != NULL && all_tryagain)
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{
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/* If we have an old record available but cannot find one now
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because the service is not available we keep the old record
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and make sure it does not get removed. */
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if (reload_count != UINT_MAX && dh->nreloads == reload_count)
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/* Do not reset the value if we never not reload the record. */
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dh->nreloads = reload_count - 1;
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/* Reload with the same time-to-live value. */
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timeout = dh->timeout = time (NULL) + db->postimeout;
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}
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else
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{
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/* We have no data. This means we send the standard reply for this
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case. */
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if (fd != -1
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&& TEMP_FAILURE_RETRY (send (fd, ¬found, total,
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MSG_NOSIGNAL)) != total)
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all_written = false;
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/* If we have a transient error or cannot permanently store
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the result, so be it. */
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if (all_tryagain || __builtin_expect (db->negtimeout == 0, 0))
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{
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/* Mark the old entry as obsolete. */
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if (dh != NULL)
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dh->usable = false;
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}
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else if ((dataset = mempool_alloc (db, (sizeof (struct dataset)
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+ req->key_len), 1)) != NULL)
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{
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timeout = datahead_init_neg (&dataset->head,
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(sizeof (struct dataset)
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+ req->key_len), total,
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db->negtimeout);
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6c4009 |
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/* This is the reply. */
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memcpy (&dataset->resp, ¬found, total);
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/* Copy the key data. */
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char *key_copy = memcpy (dataset->strdata, key, req->key_len);
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/* If necessary, we also propagate the data to disk. */
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if (db->persistent)
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{
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// XXX async OK?
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uintptr_t pval = (uintptr_t) dataset & ~pagesize_m1;
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msync ((void *) pval,
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((uintptr_t) dataset & pagesize_m1)
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+ sizeof (struct dataset) + req->key_len, MS_ASYNC);
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}
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(void) cache_add (req->type, key_copy, req->key_len,
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&dataset->head, true, db, uid, he == NULL);
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pthread_rwlock_unlock (&db->lock);
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/* Mark the old entry as obsolete. */
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if (dh != NULL)
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dh->usable = false;
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6c4009 |
}
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}
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}
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else
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{
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total = offsetof (struct dataset, strdata) + start * sizeof (int32_t);
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6c4009 |
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/* If we refill the cache, first assume the reconrd did not
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change. Allocate memory on the cache since it is likely
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6c4009 |
discarded anyway. If it turns out to be necessary to have a
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new record we can still allocate real memory. */
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6c4009 |
bool alloca_used = false;
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dataset = NULL;
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6c4009 |
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6c4009 |
if (he == NULL)
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6c4009 |
dataset = (struct dataset *) mempool_alloc (db, total + req->key_len,
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6c4009 |
1);
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6c4009 |
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6c4009 |
if (dataset == NULL)
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{
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6c4009 |
/* We cannot permanently add the result in the moment. But
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6c4009 |
we can provide the result as is. Store the data in some
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6c4009 |
temporary memory. */
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6c4009 |
dataset = (struct dataset *) alloca (total + req->key_len);
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6c4009 |
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6c4009 |
/* We cannot add this record to the permanent database. */
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6c4009 |
alloca_used = true;
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6c4009 |
}
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6c4009 |
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6c4009 |
timeout = datahead_init_pos (&dataset->head, total + req->key_len,
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6c4009 |
total - offsetof (struct dataset, resp),
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6c4009 |
he == NULL ? 0 : dh->nreloads + 1,
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6c4009 |
db->postimeout);
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6c4009 |
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6c4009 |
dataset->resp.version = NSCD_VERSION;
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6c4009 |
dataset->resp.found = 1;
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6c4009 |
dataset->resp.ngrps = start;
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6c4009 |
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6c4009 |
char *cp = dataset->strdata;
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Packit |
6c4009 |
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Packit |
6c4009 |
/* Copy the GID values. If the size of the types match this is
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6c4009 |
very simple. */
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6c4009 |
if (sizeof (gid_t) == sizeof (int32_t))
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6c4009 |
cp = mempcpy (cp, groups, start * sizeof (gid_t));
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6c4009 |
else
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Packit |
6c4009 |
{
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6c4009 |
gid_t *gcp = (gid_t *) cp;
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Packit |
6c4009 |
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Packit |
6c4009 |
for (int i = 0; i < start; ++i)
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Packit |
6c4009 |
*gcp++ = groups[i];
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Packit |
6c4009 |
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6c4009 |
cp = (char *) gcp;
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6c4009 |
}
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6c4009 |
|
|
Packit |
6c4009 |
/* Finally the user name. */
|
|
Packit |
6c4009 |
memcpy (cp, key, req->key_len);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
assert (cp == dataset->strdata + total - offsetof (struct dataset,
|
|
Packit |
6c4009 |
strdata));
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Now we can determine whether on refill we have to create a new
|
|
Packit |
6c4009 |
record or not. */
|
|
Packit |
6c4009 |
if (he != NULL)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
assert (fd == -1);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (total + req->key_len == dh->allocsize
|
|
Packit |
6c4009 |
&& total - offsetof (struct dataset, resp) == dh->recsize
|
|
Packit |
6c4009 |
&& memcmp (&dataset->resp, dh->data,
|
|
Packit |
6c4009 |
dh->allocsize - offsetof (struct dataset, resp)) == 0)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
/* The data has not changed. We will just bump the
|
|
Packit |
6c4009 |
timeout value. Note that the new record has been
|
|
Packit |
6c4009 |
allocated on the stack and need not be freed. */
|
|
Packit |
6c4009 |
dh->timeout = dataset->head.timeout;
|
|
Packit |
6c4009 |
++dh->nreloads;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
else
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
/* We have to create a new record. Just allocate
|
|
Packit |
6c4009 |
appropriate memory and copy it. */
|
|
Packit |
6c4009 |
struct dataset *newp
|
|
Packit |
6c4009 |
= (struct dataset *) mempool_alloc (db, total + req->key_len,
|
|
Packit |
6c4009 |
1);
|
|
Packit |
6c4009 |
if (newp != NULL)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
/* Adjust pointer into the memory block. */
|
|
Packit |
6c4009 |
cp = (char *) newp + (cp - (char *) dataset);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
dataset = memcpy (newp, dataset, total + req->key_len);
|
|
Packit |
6c4009 |
alloca_used = false;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Mark the old record as obsolete. */
|
|
Packit |
6c4009 |
dh->usable = false;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
else
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
/* We write the dataset before inserting it to the database
|
|
Packit |
6c4009 |
since while inserting this thread might block and so would
|
|
Packit |
6c4009 |
unnecessarily let the receiver wait. */
|
|
Packit |
6c4009 |
assert (fd != -1);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (writeall (fd, &dataset->resp, dataset->head.recsize)
|
|
Packit |
6c4009 |
!= dataset->head.recsize)
|
|
Packit |
6c4009 |
all_written = false;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Add the record to the database. But only if it has not been
|
|
Packit |
6c4009 |
stored on the stack. */
|
|
Packit |
6c4009 |
if (! alloca_used)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
/* If necessary, we also propagate the data to disk. */
|
|
Packit |
6c4009 |
if (db->persistent)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
// XXX async OK?
|
|
Packit |
6c4009 |
uintptr_t pval = (uintptr_t) dataset & ~pagesize_m1;
|
|
Packit |
6c4009 |
msync ((void *) pval,
|
|
Packit |
6c4009 |
((uintptr_t) dataset & pagesize_m1) + total +
|
|
Packit |
6c4009 |
req->key_len, MS_ASYNC);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
(void) cache_add (INITGROUPS, cp, req->key_len, &dataset->head, true,
|
|
Packit |
6c4009 |
db, uid, he == NULL);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
pthread_rwlock_unlock (&db->lock);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
free (groups);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (__builtin_expect (!all_written, 0) && debug_level > 0)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
char buf[256];
|
|
Packit |
6c4009 |
dbg_log (_("short write in %s: %s"), __FUNCTION__,
|
|
Packit |
6c4009 |
strerror_r (errno, buf, sizeof (buf)));
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
return timeout;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
void
|
|
Packit |
6c4009 |
addinitgroups (struct database_dyn *db, int fd, request_header *req, void *key,
|
|
Packit |
6c4009 |
uid_t uid)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
addinitgroupsX (db, fd, req, key, uid, NULL, NULL);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
time_t
|
|
Packit |
6c4009 |
readdinitgroups (struct database_dyn *db, struct hashentry *he,
|
|
Packit |
6c4009 |
struct datahead *dh)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
request_header req =
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
.type = INITGROUPS,
|
|
Packit |
6c4009 |
.key_len = he->len
|
|
Packit |
6c4009 |
};
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
return addinitgroupsX (db, -1, &req, db->data + he->key, he->owner, he, dh);
|
|
Packit |
6c4009 |
}
|