352 lines
9.2 KiB
C
352 lines
9.2 KiB
C
/* Cache handling for group lookup.
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Copyright (C) 1998, 1999, 2000, 2001, 2002 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@cygnus.com>, 1998.
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <error.h>
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#include <grp.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdint.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 <libintl.h>
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#include <stackinfo.h>
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#include "nscd.h"
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#include "dbg_log.h"
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/* This is the standard reply in case the service is disabled. */
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static const gr_response_header disabled =
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{
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version: NSCD_VERSION,
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found: -1,
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gr_name_len: 0,
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gr_passwd_len: 0,
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gr_gid: -1,
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gr_mem_cnt: 0,
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};
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/* This is the struct describing how to write this record. */
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const struct iovec grp_iov_disabled =
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{
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iov_base: (void *) &disabled,
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iov_len: sizeof (disabled)
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};
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/* This is the standard reply in case we haven't found the dataset. */
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static const gr_response_header notfound =
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{
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version: NSCD_VERSION,
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found: 0,
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gr_name_len: 0,
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gr_passwd_len: 0,
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gr_gid: -1,
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gr_mem_cnt: 0,
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};
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/* This is the struct describing how to write this record. */
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static const struct iovec iov_notfound =
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{
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iov_base: (void *) ¬found,
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iov_len: sizeof (notfound)
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};
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struct groupdata
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{
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gr_response_header resp;
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char strdata[0];
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};
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static void
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cache_addgr (struct database *db, int fd, request_header *req, void *key,
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struct group *grp, uid_t owner)
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{
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ssize_t total;
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ssize_t written;
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time_t t = time (NULL);
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if (grp == NULL)
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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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void *copy;
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total = sizeof (notfound);
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written = writev (fd, &iov_notfound, 1);
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copy = malloc (req->key_len);
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if (copy == NULL)
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error (EXIT_FAILURE, errno, _("while allocating key copy"));
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memcpy (copy, key, req->key_len);
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/* Compute the timeout time. */
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t += db->negtimeout;
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/* Now get the lock to safely insert the records. */
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pthread_rwlock_rdlock (&db->lock);
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cache_add (req->type, copy, req->key_len, ¬found,
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sizeof (notfound), (void *) -1, 0, t, db, owner);
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pthread_rwlock_unlock (&db->lock);
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}
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else
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{
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/* Determine the I/O structure. */
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struct groupdata *data;
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size_t gr_name_len = strlen (grp->gr_name) + 1;
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size_t gr_passwd_len = strlen (grp->gr_passwd) + 1;
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size_t gr_mem_cnt = 0;
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uint32_t *gr_mem_len;
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size_t gr_mem_len_total = 0;
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char *gr_name;
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char *cp;
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char buf[12];
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ssize_t n;
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size_t cnt;
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/* We need this to insert the `bygid' entry. */
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n = snprintf (buf, sizeof (buf), "%d", grp->gr_gid) + 1;
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/* Determine the length of all members. */
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while (grp->gr_mem[gr_mem_cnt])
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++gr_mem_cnt;
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gr_mem_len = (uint32_t *) alloca (gr_mem_cnt * sizeof (uint32_t));
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for (gr_mem_cnt = 0; grp->gr_mem[gr_mem_cnt]; ++gr_mem_cnt)
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{
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gr_mem_len[gr_mem_cnt] = strlen (grp->gr_mem[gr_mem_cnt]) + 1;
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gr_mem_len_total += gr_mem_len[gr_mem_cnt];
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}
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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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total = (sizeof (struct groupdata)
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+ gr_mem_cnt * sizeof (uint32_t)
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+ gr_name_len + gr_passwd_len + gr_mem_len_total);
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data = (struct groupdata *) malloc (total + n);
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if (data == NULL)
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/* There is no reason to go on. */
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error (EXIT_FAILURE, errno, _("while allocating cache entry"));
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data->resp.found = 1;
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data->resp.gr_name_len = gr_name_len;
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data->resp.gr_passwd_len = gr_passwd_len;
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data->resp.gr_gid = grp->gr_gid;
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data->resp.gr_mem_cnt = gr_mem_cnt;
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cp = data->strdata;
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/* This is the member string length array. */
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cp = mempcpy (cp, gr_mem_len, gr_mem_cnt * sizeof (uint32_t));
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gr_name = cp;
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cp = mempcpy (cp, grp->gr_name, gr_name_len);
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cp = mempcpy (cp, grp->gr_passwd, gr_passwd_len);
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for (cnt = 0; cnt < gr_mem_cnt; ++cnt)
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cp = mempcpy (cp, grp->gr_mem[cnt], gr_mem_len[cnt]);
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/* Finally the stringified GID value. */
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memcpy (cp, buf, n);
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/* Write the result. */
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written = TEMP_FAILURE_RETRY (write (fd, &data->resp, total));
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/* Compute the timeout time. */
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t += db->postimeout;
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/* Now get the lock to safely insert the records. */
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pthread_rwlock_rdlock (&db->lock);
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/* We have to add the value for both, byname and byuid. */
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cache_add (GETGRBYNAME, gr_name, gr_name_len, data,
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total, data, 0, t, db, owner);
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cache_add (GETGRBYGID, cp, n, data, total, data, 1, t, db, owner);
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pthread_rwlock_unlock (&db->lock);
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}
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if (__builtin_expect (written != total, 0) && debug_level > 0)
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{
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char buf[256];
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dbg_log (_("short write in %s: %s"), __FUNCTION__,
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strerror_r (errno, buf, sizeof (buf)));
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}
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}
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void
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addgrbyname (struct database *db, int fd, request_header *req,
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void *key, uid_t uid)
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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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int buflen = 1024;
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char *buffer = (char *) alloca (buflen);
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struct group resultbuf;
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struct group *grp;
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uid_t oldeuid = 0;
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bool use_malloc = false;
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if (__builtin_expect (debug_level > 0, 0))
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dbg_log (_("Haven't found \"%s\" in group cache!"), (char *) key);
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if (secure[grpdb])
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{
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oldeuid = geteuid ();
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seteuid (uid);
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}
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while (__getgrnam_r (key, &resultbuf, buffer, buflen, &grp) != 0
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&& errno == ERANGE)
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{
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char *old_buffer = buffer;
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errno = 0;
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buflen += 1024;
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if (__builtin_expect (buflen > 32768, 0))
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{
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buffer = (char *) realloc (use_malloc ? buffer : NULL, buflen);
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if (buffer == NULL)
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{
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/* We ran out of memory. We cannot do anything but
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sending a negative response. In reality this should
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never happen. */
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grp = NULL;
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buffer = old_buffer;
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break;
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}
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use_malloc = true;
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}
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else
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{
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buffer = (char *) alloca (buflen);
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#if _STACK_GROWS_DOWN
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if (buffer + buflen == old_buffer)
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buflen = 2 * buflen - 1024;
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#elif _STACK_GROWS_UP
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if (old_buffer + buflen - 1024 == buffer)
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{
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buffer = old_buffer;
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buflen = 2 * buflen - 1024;
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}
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#endif
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}
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}
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if (secure[grpdb])
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seteuid (oldeuid);
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cache_addgr (db, fd, req, key, grp, uid);
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if (use_malloc)
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free (buffer);
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}
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void
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addgrbygid (struct database *db, int fd, request_header *req,
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void *key, uid_t uid)
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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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int buflen = 1024;
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char *buffer = (char *) alloca (buflen);
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struct group resultbuf;
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struct group *grp;
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uid_t oldeuid = 0;
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char *ep;
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gid_t gid = strtoul ((char *)key, &ep, 10);
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bool use_malloc = false;
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if (*(char *) key == '\0' || *ep != '\0') /* invalid numeric gid */
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{
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if (debug_level > 0)
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dbg_log (_("Invalid numeric gid \"%s\"!"), (char *) key);
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errno = EINVAL;
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return;
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}
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if (__builtin_expect (debug_level > 0, 0))
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dbg_log (_("Haven't found \"%d\" in group cache!"), gid);
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if (secure[grpdb])
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{
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oldeuid = geteuid ();
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seteuid (uid);
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}
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while (__getgrgid_r (gid, &resultbuf, buffer, buflen, &grp) != 0
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&& errno == ERANGE)
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{
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char *old_buffer = buffer;
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errno = 0;
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buflen += 1024;
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if (__builtin_expect (buflen > 32768, 0))
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{
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buffer = (char *) realloc (use_malloc ? buffer : NULL, buflen);
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if (buffer == NULL)
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{
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/* We ran out of memory. We cannot do anything but
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sending a negative response. In reality this should
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never happen. */
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grp = NULL;
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buffer = old_buffer;
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break;
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}
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use_malloc = true;
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}
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else
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{
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buffer = (char *) alloca (buflen);
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#if _STACK_GROWS_DOWN
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if (buffer + buflen == old_buffer)
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buflen = 2 * buflen - 1024;
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#elif _STACK_GROWS_UP
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if (old_buffer + buflen - 1024 == buffer)
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{
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buffer = old_buffer;
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buflen = 2 * buflen - 1024;
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}
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#endif
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}
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}
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if (secure[grpdb])
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seteuid (oldeuid);
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cache_addgr (db, fd, req, key, grp, uid);
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if (use_malloc)
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free (buffer);
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}
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