nscd/nscd_stat.c

   1 /* Copyright (c) 1998, 2003, 2004 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1998.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <error.h>
  22 #include <inttypes.h>
  23 #include <langinfo.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <unistd.h>
  28 #include <libintl.h>
  29
  30 #include "nscd.h"
  31 #include "dbg_log.h"
  32 #include "selinux.h"
  33 #ifdef HAVE_SELINUX
  34 # include <selinux/selinux.h>
  35 # include <selinux/avc.h>
  36 #endif /* HAVE_SELINUX */
  37
  38
  39 /* We use this to make sure the receiver is the same.  */
  40 static const char compilation[21] = __DATE__ " " __TIME__;
  41
  42 /* Statistic data for one database.  */
  43 struct dbstat
  44 {
  45   int enabled;
  46   int check_file;
  47   int shared;
  48   int persistent;
  49   size_t module;
  50
  51   unsigned long int postimeout;
  52   unsigned long int negtimeout;
  53
  54   size_t nentries;
  55   size_t maxnentries;
  56   size_t maxnsearched;
  57   size_t datasize;
  58   size_t dataused;
  59
  60   uintmax_t poshit;
  61   uintmax_t neghit;
  62   uintmax_t posmiss;
  63   uintmax_t negmiss;
  64
  65   uintmax_t rdlockdelayed;
  66   uintmax_t wrlockdelayed;
  67
  68   uintmax_t addfailed;
  69 };
  70
  71 /* Record for transmitting statistics.  */
  72 struct statdata
  73 {
  74   char version[sizeof (compilation)];
  75   int debug_level;
  76   time_t runtime;
  77   unsigned long int client_queued;
  78   int ndbs;
  79   struct dbstat dbs[lastdb];
  80 #ifdef HAVE_SELINUX
  81   struct avc_cache_stats cstats;
  82 #endif /* HAVE_SELINUX */
  83 };
  84
  85
  86 void
  87 send_stats (int fd, struct database_dyn dbs[lastdb])
  88 {
  89   struct statdata data;
  90   int cnt;
  91
  92   memcpy (data.version, compilation, sizeof (compilation));
  93   data.debug_level = debug_level;
  94   data.runtime = time (NULL) - start_time;
  95   data.client_queued = client_queued;
  96   data.ndbs = lastdb;
  97
  98   for (cnt = 0; cnt < lastdb; ++cnt)
  99     {
 100       memset (&data.dbs[cnt], 0, sizeof (data.dbs[cnt]));
 101       data.dbs[cnt].enabled = dbs[cnt].enabled;
 102       data.dbs[cnt].check_file = dbs[cnt].check_file;
 103       data.dbs[cnt].shared = dbs[cnt].shared;
 104       data.dbs[cnt].persistent = dbs[cnt].persistent;
 105       data.dbs[cnt].postimeout = dbs[cnt].postimeout;
 106       data.dbs[cnt].negtimeout = dbs[cnt].negtimeout;
 107       if (dbs[cnt].head != NULL)
 108         {
 109           data.dbs[cnt].module = dbs[cnt].head->module;
 110           data.dbs[cnt].poshit = dbs[cnt].head->poshit;
 111           data.dbs[cnt].neghit = dbs[cnt].head->neghit;
 112           data.dbs[cnt].posmiss = dbs[cnt].head->posmiss;
 113           data.dbs[cnt].negmiss = dbs[cnt].head->negmiss;
 114           data.dbs[cnt].nentries = dbs[cnt].head->nentries;
 115           data.dbs[cnt].maxnentries = dbs[cnt].head->maxnentries;
 116           data.dbs[cnt].datasize = dbs[cnt].head->data_size;
 117           data.dbs[cnt].dataused = dbs[cnt].head->first_free;
 118           data.dbs[cnt].maxnsearched = dbs[cnt].head->maxnsearched;
 119           data.dbs[cnt].rdlockdelayed = dbs[cnt].head->rdlockdelayed;
 120           data.dbs[cnt].wrlockdelayed = dbs[cnt].head->wrlockdelayed;
 121           data.dbs[cnt].addfailed = dbs[cnt].head->addfailed;
 122         }
 123     }
 124
 125   if (selinux_enabled)
 126     nscd_avc_cache_stats (&data.cstats);
 127
 128   if (TEMP_FAILURE_RETRY (write (fd, &data, sizeof (data))) != sizeof (data))
 129     {
 130       char buf[256];
 131       dbg_log (_("cannot write statistics: %s"),
 132                strerror_r (errno, buf, sizeof (buf)));
 133     }
 134 }
 135
 136
 137 int
 138 receive_print_stats (void)
 139 {
 140   struct statdata data;
 141   request_header req;
 142   ssize_t nbytes;
 143   int fd;
 144   int i;
 145   uid_t uid = getuid ();
 146
 147   /* Find out whether there is another user but root allowed to
 148      request statistics.  */
 149   if (uid != 0)
 150     {
 151       /* User specified?  */
 152       if(stat_user == NULL || stat_uid != uid)
 153         {
 154           if (stat_user != NULL)
 155             error (EXIT_FAILURE, 0,
 156                    _("Only root or %s is allowed to use this option!"),
 157                    stat_user);
 158           else
 159             error (EXIT_FAILURE, 0,
 160                    _("Only root is allowed to use this option!"));
 161         }
 162     }
 163
 164   /* Open a socket to the running nscd.  */
 165   fd = nscd_open_socket ();
 166   if (fd == -1)
 167     error (EXIT_FAILURE, 0, _("nscd not running!\n"));
 168
 169   /* Send the request.  */
 170   req.version = NSCD_VERSION;
 171   req.type = GETSTAT;
 172   req.key_len = 0;
 173   nbytes = TEMP_FAILURE_RETRY (write (fd, &req, sizeof (request_header)));
 174   if (nbytes != sizeof (request_header))
 175     {
 176       int err = errno;
 177       close (fd);
 178       error (EXIT_FAILURE, err, _("write incomplete"));
 179     }
 180
 181   /* Read as much data as we expect.  */
 182   if (TEMP_FAILURE_RETRY (read (fd, &data, sizeof (data))) != sizeof (data)
 183       || (memcmp (data.version, compilation, sizeof (compilation)) != 0
 184           /* Yes, this is an assignment!  */
 185           && (errno = EINVAL)))
 186     {
 187       /* Not the right version.  */
 188       int err = errno;
 189       close (fd);
 190       error (EXIT_FAILURE, err, _("cannot read statistics data"));
 191     }
 192
 193   printf (_("nscd configuration:\n\n%15d  server debug level\n"),
 194           data.debug_level);
 195
 196   /* We know that we can simply subtract time_t values.  */
 197   unsigned long int diff = data.runtime;
 198   unsigned int ndays = 0;
 199   unsigned int nhours = 0;
 200   unsigned int nmins = 0;
 201   if (diff > 24 * 60 * 60)
 202     {
 203       ndays = diff / (24 * 60 * 60);
 204       diff %= 24 * 60 * 60;
 205     }
 206   if (diff > 60 * 60)
 207     {
 208       nhours = diff / (60 * 60);
 209       diff %= 60 * 60;
 210     }
 211   if (diff > 60)
 212     {
 213       nmins = diff / 60;
 214       diff %= 60;
 215     }
 216   if (ndays != 0)
 217     printf (_("%3ud %2uh %2um %2lus  server runtime\n"),
 218             ndays, nhours, nmins, diff);
 219   else if (nhours != 0)
 220     printf (_("    %2uh %2um %2lus  server runtime\n"), nhours, nmins, diff);
 221   else if (nmins != 0)
 222     printf (_("        %2um %2lus  server runtime\n"), nmins, diff);
 223   else
 224     printf (_("            %2lus  server runtime\n"), diff);
 225
 226   printf (_("%15lu  number of times clients had to wait\n"),
 227           data.client_queued);
 228
 229   for (i = 0; i < lastdb; ++i)
 230     {
 231       unsigned long int hit = data.dbs[i].poshit + data.dbs[i].neghit;
 232       unsigned long int all = hit + data.dbs[i].posmiss + data.dbs[i].negmiss;
 233       const char *enabled = nl_langinfo (data.dbs[i].enabled ? YESSTR : NOSTR);
 234       const char *check_file = nl_langinfo (data.dbs[i].check_file
 235                                             ? YESSTR : NOSTR);
 236       const char *shared = nl_langinfo (data.dbs[i].shared ? YESSTR : NOSTR);
 237       const char *persistent = nl_langinfo (data.dbs[i].persistent
 238                                             ? YESSTR : NOSTR);
 239
 240       if (enabled[0] == '\0')
 241         /* The locale does not provide this information so we have to
 242            translate it ourself.  Since we should avoid short translation
 243            terms we artifically increase the length.  */
 244         enabled = data.dbs[i].enabled ? _("     yes") : _("      no");
 245       if (check_file[0] == '\0')
 246         check_file = data.dbs[i].check_file ? _("     yes") : _("      no");
 247       if (shared[0] == '\0')
 248         shared = data.dbs[i].shared ? _("     yes") : _("      no");
 249       if (persistent[0] == '\0')
 250         persistent = data.dbs[i].persistent ? _("     yes") : _("      no");
 251
 252       if (all == 0)
 253         /* If nothing happened so far report a 0% hit rate.  */
 254         all = 1;
 255
 256       printf (_("\n%s cache:\n\n"
 257                 "%15s  cache is enabled\n"
 258                 "%15s  cache is persistent\n"
 259                 "%15s  cache is shared\n"
 260                 "%15zu  suggested size\n"
 261                 "%15zu  total data pool size\n"
 262                 "%15zu  used data pool size\n"
 263                 "%15lu  seconds time to live for positive entries\n"
 264                 "%15lu  seconds time to live for negative entries\n"
 265                 "%15" PRIuMAX "  cache hits on positive entries\n"
 266                 "%15" PRIuMAX "  cache hits on negative entries\n"
 267                 "%15" PRIuMAX "  cache misses on positive entries\n"
 268                 "%15" PRIuMAX "  cache misses on negative entries\n"
 269                 "%15lu%% cache hit rate\n"
 270                 "%15zu  current number of cached values\n"
 271                 "%15zu  maximum number of cached values\n"
 272                 "%15zu  maximum chain length searched\n"
 273                 "%15" PRIuMAX "  number of delays on rdlock\n"
 274                 "%15" PRIuMAX "  number of delays on wrlock\n"
 275                 "%15" PRIuMAX "  memory allocations failed\n"
 276                 "%15s  check /etc/%s for changes\n"),
 277               dbnames[i], enabled, persistent, shared,
 278               data.dbs[i].module,
 279               data.dbs[i].datasize, data.dbs[i].dataused,
 280               data.dbs[i].postimeout, data.dbs[i].negtimeout,
 281               data.dbs[i].poshit, data.dbs[i].neghit,
 282               data.dbs[i].posmiss, data.dbs[i].negmiss,
 283               (100 * hit) / all,
 284               data.dbs[i].nentries, data.dbs[i].maxnentries,
 285               data.dbs[i].maxnsearched,
 286               data.dbs[i].rdlockdelayed,
 287               data.dbs[i].wrlockdelayed,
 288               data.dbs[i].addfailed, check_file, dbnames[i]);
 289     }
 290
 291   if (selinux_enabled)
 292     nscd_avc_print_stats (&data.cstats);
 293
 294   close (fd);
 295
 296   exit (0);
 297 }