glibc/nscd/nscd_stat.c

334 lines
9.9 KiB
C

/* Copyright (c) 1998-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1998.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <error.h>
#include <inttypes.h>
#include <langinfo.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
#include <libintl.h>
#include "nscd.h"
#include "dbg_log.h"
#include "selinux.h"
#ifdef HAVE_SELINUX
# include <selinux/selinux.h>
# include <selinux/avc.h>
#endif /* HAVE_SELINUX */
/* We use this to make sure the receiver is the same. The lower 16
bits are reserved for flags indicating compilation variants. This
version needs to be updated if the definition of struct statdata
changes. */
#define STATDATA_VERSION 0x01020000U
#ifdef HAVE_SELINUX
# define STATDATA_VERSION_SELINUX_FLAG 0x0001U
#else
# define STATDATA_VERSION_SELINUX_FLAG 0x0000U
#endif
/* All flags affecting the struct statdata layout. */
#define STATDATA_VERSION_FLAGS STATDATA_VERSION_SELINUX_FLAG
/* The full version number for struct statdata. */
#define STATDATA_VERSION_FULL (STATDATA_VERSION | STATDATA_VERSION_FLAGS)
/* Statistic data for one database. */
struct dbstat
{
int enabled;
int check_file;
int shared;
int persistent;
size_t module;
unsigned long int postimeout;
unsigned long int negtimeout;
size_t nentries;
size_t maxnentries;
size_t maxnsearched;
size_t datasize;
size_t dataused;
uintmax_t poshit;
uintmax_t neghit;
uintmax_t posmiss;
uintmax_t negmiss;
uintmax_t rdlockdelayed;
uintmax_t wrlockdelayed;
uintmax_t addfailed;
};
/* Record for transmitting statistics. If this definition changes,
update STATDATA_VERSION above. */
struct statdata
{
unsigned int version; /* Must be STATDATA_VERSION_FULL. */
int debug_level;
time_t runtime;
unsigned long int client_queued;
int nthreads;
int max_nthreads;
int paranoia;
time_t restart_interval;
unsigned int reload_count;
int ndbs;
struct dbstat dbs[lastdb];
#ifdef HAVE_SELINUX
struct avc_cache_stats cstats;
#endif /* HAVE_SELINUX */
};
void
send_stats (int fd, struct database_dyn dbs[lastdb])
{
struct statdata data;
int cnt;
memset (&data, 0, sizeof (data));
data.version = STATDATA_VERSION_FULL;
data.debug_level = debug_level;
data.runtime = time (NULL) - start_time;
data.client_queued = client_queued;
data.nthreads = nthreads;
data.max_nthreads = max_nthreads;
data.paranoia = paranoia;
data.restart_interval = restart_interval;
data.reload_count = reload_count;
data.ndbs = lastdb;
for (cnt = 0; cnt < lastdb; ++cnt)
{
memset (&data.dbs[cnt], 0, sizeof (data.dbs[cnt]));
data.dbs[cnt].enabled = dbs[cnt].enabled;
data.dbs[cnt].check_file = dbs[cnt].check_file;
data.dbs[cnt].shared = dbs[cnt].shared;
data.dbs[cnt].persistent = dbs[cnt].persistent;
data.dbs[cnt].postimeout = dbs[cnt].postimeout;
data.dbs[cnt].negtimeout = dbs[cnt].negtimeout;
if (dbs[cnt].head != NULL)
{
data.dbs[cnt].module = dbs[cnt].head->module;
data.dbs[cnt].poshit = dbs[cnt].head->poshit;
data.dbs[cnt].neghit = dbs[cnt].head->neghit;
data.dbs[cnt].posmiss = dbs[cnt].head->posmiss;
data.dbs[cnt].negmiss = dbs[cnt].head->negmiss;
data.dbs[cnt].nentries = dbs[cnt].head->nentries;
data.dbs[cnt].maxnentries = dbs[cnt].head->maxnentries;
data.dbs[cnt].datasize = dbs[cnt].head->data_size;
data.dbs[cnt].dataused = dbs[cnt].head->first_free;
data.dbs[cnt].maxnsearched = dbs[cnt].head->maxnsearched;
data.dbs[cnt].rdlockdelayed = dbs[cnt].head->rdlockdelayed;
data.dbs[cnt].wrlockdelayed = dbs[cnt].head->wrlockdelayed;
data.dbs[cnt].addfailed = dbs[cnt].head->addfailed;
}
}
if (selinux_enabled)
nscd_avc_cache_stats (&data.cstats);
if (TEMP_FAILURE_RETRY (send (fd, &data, sizeof (data), MSG_NOSIGNAL))
!= sizeof (data))
{
char buf[256];
dbg_log (_("cannot write statistics: %s"),
strerror_r (errno, buf, sizeof (buf)));
}
}
int
receive_print_stats (void)
{
struct statdata data;
request_header req;
ssize_t nbytes;
int fd;
int i;
uid_t uid = getuid ();
const char *yesstr = _("yes");
const char *nostr = _("no");
/* Find out whether there is another user but root allowed to
request statistics. */
if (uid != 0)
{
/* User specified? */
if(stat_user == NULL || stat_uid != uid)
{
if (stat_user != NULL)
error (EXIT_FAILURE, 0,
_("Only root or %s is allowed to use this option!"),
stat_user);
else
error (EXIT_FAILURE, 0,
_("Only root is allowed to use this option!"));
}
}
/* Open a socket to the running nscd. */
fd = nscd_open_socket ();
if (fd == -1)
error (EXIT_FAILURE, 0, _("nscd not running!\n"));
/* Send the request. */
req.version = NSCD_VERSION;
req.type = GETSTAT;
req.key_len = 0;
nbytes = TEMP_FAILURE_RETRY (send (fd, &req, sizeof (request_header),
MSG_NOSIGNAL));
if (nbytes != sizeof (request_header))
{
int err = errno;
close (fd);
error (EXIT_FAILURE, err, _("write incomplete"));
}
/* Read as much data as we expect. */
if (TEMP_FAILURE_RETRY (read (fd, &data, sizeof (data))) != sizeof (data)
|| (data.version != STATDATA_VERSION_FULL
/* Yes, this is an assignment! */
&& (errno = EINVAL)))
{
/* Not the right version. */
int err = errno;
close (fd);
error (EXIT_FAILURE, err, _("cannot read statistics data"));
}
printf (_("nscd configuration:\n\n%15d server debug level\n"),
data.debug_level);
/* We know that we can simply subtract time_t values. */
unsigned long int diff = data.runtime;
unsigned int ndays = 0;
unsigned int nhours = 0;
unsigned int nmins = 0;
if (diff > 24 * 60 * 60)
{
ndays = diff / (24 * 60 * 60);
diff %= 24 * 60 * 60;
}
if (diff > 60 * 60)
{
nhours = diff / (60 * 60);
diff %= 60 * 60;
}
if (diff > 60)
{
nmins = diff / 60;
diff %= 60;
}
if (ndays != 0)
printf (_("%3ud %2uh %2um %2lus server runtime\n"),
ndays, nhours, nmins, diff);
else if (nhours != 0)
printf (_(" %2uh %2um %2lus server runtime\n"), nhours, nmins, diff);
else if (nmins != 0)
printf (_(" %2um %2lus server runtime\n"), nmins, diff);
else
printf (_(" %2lus server runtime\n"), diff);
printf (_("%15d current number of threads\n"
"%15d maximum number of threads\n"
"%15lu number of times clients had to wait\n"
"%15s paranoia mode enabled\n"
"%15lu restart internal\n"
"%15u reload count\n"),
data.nthreads, data.max_nthreads, data.client_queued,
data.paranoia ? yesstr : nostr,
(unsigned long int) data.restart_interval, data.reload_count);
for (i = 0; i < lastdb; ++i)
{
unsigned long int hit = data.dbs[i].poshit + data.dbs[i].neghit;
unsigned long int all = hit + data.dbs[i].posmiss + data.dbs[i].negmiss;
const char *enabled = data.dbs[i].enabled ? yesstr : nostr;
const char *check_file = data.dbs[i].check_file ? yesstr : nostr;
const char *shared = data.dbs[i].shared ? yesstr : nostr;
const char *persistent = data.dbs[i].persistent ? yesstr : nostr;
if (enabled[0] == '\0')
/* The locale does not provide this information so we have to
translate it ourself. Since we should avoid short translation
terms we artifically increase the length. */
enabled = data.dbs[i].enabled ? yesstr : nostr;
if (check_file[0] == '\0')
check_file = data.dbs[i].check_file ? yesstr : nostr;
if (shared[0] == '\0')
shared = data.dbs[i].shared ? yesstr : nostr;
if (persistent[0] == '\0')
persistent = data.dbs[i].persistent ? yesstr : nostr;
if (all == 0)
/* If nothing happened so far report a 0% hit rate. */
all = 1;
printf (_("\n%s cache:\n\n"
"%15s cache is enabled\n"
"%15s cache is persistent\n"
"%15s cache is shared\n"
"%15zu suggested size\n"
"%15zu total data pool size\n"
"%15zu used data pool size\n"
"%15lu seconds time to live for positive entries\n"
"%15lu seconds time to live for negative entries\n"
"%15" PRIuMAX " cache hits on positive entries\n"
"%15" PRIuMAX " cache hits on negative entries\n"
"%15" PRIuMAX " cache misses on positive entries\n"
"%15" PRIuMAX " cache misses on negative entries\n"
"%15lu%% cache hit rate\n"
"%15zu current number of cached values\n"
"%15zu maximum number of cached values\n"
"%15zu maximum chain length searched\n"
"%15" PRIuMAX " number of delays on rdlock\n"
"%15" PRIuMAX " number of delays on wrlock\n"
"%15" PRIuMAX " memory allocations failed\n"
"%15s check /etc/%s for changes\n"),
dbnames[i], enabled, persistent, shared,
data.dbs[i].module,
data.dbs[i].datasize, data.dbs[i].dataused,
data.dbs[i].postimeout, data.dbs[i].negtimeout,
data.dbs[i].poshit, data.dbs[i].neghit,
data.dbs[i].posmiss, data.dbs[i].negmiss,
(100 * hit) / all,
data.dbs[i].nentries, data.dbs[i].maxnentries,
data.dbs[i].maxnsearched,
data.dbs[i].rdlockdelayed,
data.dbs[i].wrlockdelayed,
data.dbs[i].addfailed, check_file, dbnames[i]);
}
if (selinux_enabled)
nscd_avc_print_stats (&data.cstats);
close (fd);
exit (0);
}