nscd/nscd_conf.c

   1 /* Copyright (c) 1998-2021 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@suse.de>, 1998.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published
   7    by the Free Software Foundation; version 2 of the License, or
   8    (at your option) any later version.
   9
  10    This program 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
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, see <https://www.gnu.org/licenses/>.  */
  17
  18 #include <ctype.h>
  19 #include <errno.h>
  20 #include <error.h>
  21 #include <libintl.h>
  22 #include <malloc.h>
  23 #include <pwd.h>
  24 #include <stdio.h>
  25 #include <stdio_ext.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <unistd.h>
  29 #include <sys/param.h>
  30 #include <sys/types.h>
  31
  32 #include "dbg_log.h"
  33 #include "nscd.h"
  34
  35
  36 /* Names of the databases.  */
  37 const char *const dbnames[lastdb] =
  38 {
  39   [pwddb] = "passwd",
  40   [grpdb] = "group",
  41   [hstdb] = "hosts",
  42   [servdb] = "services",
  43   [netgrdb] = "netgroup"
  44 };
  45
  46
  47 static int
  48 find_db (const char *name)
  49 {
  50   for (int cnt = 0; cnt < lastdb; ++cnt)
  51     if (strcmp (name, dbnames[cnt]) == 0)
  52       return cnt;
  53
  54   error (0, 0, _("database %s is not supported"), name);
  55   return -1;
  56 }
  57
  58 int
  59 nscd_parse_file (const char *fname, struct database_dyn dbs[lastdb])
  60 {
  61   FILE *fp;
  62   char *line, *cp, *entry, *arg1, *arg2;
  63   size_t len;
  64   int cnt;
  65   const unsigned int initial_error_message_count = error_message_count;
  66
  67   /* Open the configuration file.  */
  68   fp = fopen (fname, "r");
  69   if (fp == NULL)
  70     return -1;
  71
  72   /* The stream is not used by more than one thread.  */
  73   (void) __fsetlocking (fp, FSETLOCKING_BYCALLER);
  74
  75   line = NULL;
  76   len = 0;
  77
  78   do
  79     {
  80       ssize_t n = getline (&line, &len, fp);
  81       if (n < 0)
  82         break;
  83       if (line[n - 1] == '\n')
  84         line[n - 1] = '\0';
  85
  86       /* Because the file format does not know any form of quoting we
  87          can search forward for the next '#' character and if found
  88          make it terminating the line.  */
  89       *strchrnul (line, '#') = '\0';
  90
  91       /* If the line is blank it is ignored.  */
  92       if (line[0] == '\0')
  93         continue;
  94
  95       entry = line;
  96       while (isspace (*entry) && *entry != '\0')
  97         ++entry;
  98       cp = entry;
  99       while (!isspace (*cp) && *cp != '\0')
 100         ++cp;
 101       arg1 = cp;
 102       ++arg1;
 103       *cp = '\0';
 104       if (strlen (entry) == 0)
 105         error (0, 0, _("Parse error: %s"), line);
 106       while (isspace (*arg1) && *arg1 != '\0')
 107         ++arg1;
 108       cp = arg1;
 109       while (!isspace (*cp) && *cp != '\0')
 110         ++cp;
 111       arg2 = cp;
 112       ++arg2;
 113       *cp = '\0';
 114       if (strlen (arg2) > 0)
 115         {
 116           while (isspace (*arg2) && *arg2 != '\0')
 117             ++arg2;
 118           cp = arg2;
 119           while (!isspace (*cp) && *cp != '\0')
 120             ++cp;
 121           *cp = '\0';
 122         }
 123
 124       if (strcmp (entry, "positive-time-to-live") == 0)
 125         {
 126           int idx = find_db (arg1);
 127           if (idx >= 0)
 128             dbs[idx].postimeout = atol (arg2);
 129         }
 130       else if (strcmp (entry, "negative-time-to-live") == 0)
 131         {
 132           int idx = find_db (arg1);
 133           if (idx >= 0)
 134             dbs[idx].negtimeout = atol (arg2);
 135         }
 136       else if (strcmp (entry, "suggested-size") == 0)
 137         {
 138           int idx = find_db (arg1);
 139           if (idx >= 0)
 140             dbs[idx].suggested_module
 141               = atol (arg2) ?: DEFAULT_SUGGESTED_MODULE;
 142         }
 143       else if (strcmp (entry, "enable-cache") == 0)
 144         {
 145           int idx = find_db (arg1);
 146           if (idx >= 0)
 147             {
 148               if (strcmp (arg2, "no") == 0)
 149                 dbs[idx].enabled = 0;
 150               else if (strcmp (arg2, "yes") == 0)
 151                 dbs[idx].enabled = 1;
 152             }
 153         }
 154       else if (strcmp (entry, "check-files") == 0)
 155         {
 156           int idx = find_db (arg1);
 157           if (idx >= 0)
 158             {
 159               if (strcmp (arg2, "no") == 0)
 160                 dbs[idx].check_file = 0;
 161               else if (strcmp (arg2, "yes") == 0)
 162                 dbs[idx].check_file = 1;
 163             }
 164         }
 165       else if (strcmp (entry, "max-db-size") == 0)
 166         {
 167           int idx = find_db (arg1);
 168           if (idx >= 0)
 169             dbs[idx].max_db_size = atol (arg2) ?: DEFAULT_MAX_DB_SIZE;
 170         }
 171       else if (strcmp (entry, "logfile") == 0)
 172         set_logfile (arg1);
 173       else if (strcmp (entry, "debug-level") == 0)
 174         {
 175           int level = atoi (arg1);
 176           if (level > 0)
 177             debug_level = level;
 178         }
 179       else if (strcmp (entry, "threads") == 0)
 180         {
 181           if (nthreads == -1)
 182             nthreads = MAX (atol (arg1), lastdb);
 183         }
 184       else if (strcmp (entry, "max-threads") == 0)
 185         {
 186           max_nthreads = MAX (atol (arg1), lastdb);
 187         }
 188       else if (strcmp (entry, "server-user") == 0)
 189         {
 190           if (!arg1)
 191             error (0, 0, _("Must specify user name for server-user option"));
 192           else
 193             {
 194               free ((char *) server_user);
 195               server_user = xstrdup (arg1);
 196             }
 197         }
 198       else if (strcmp (entry, "stat-user") == 0)
 199         {
 200           if (arg1 == NULL)
 201             error (0, 0, _("Must specify user name for stat-user option"));
 202           else
 203             {
 204               free ((char *) stat_user);
 205               stat_user = xstrdup (arg1);
 206
 207               struct passwd *pw = getpwnam (stat_user);
 208               if (pw != NULL)
 209                 stat_uid = pw->pw_uid;
 210             }
 211         }
 212       else if (strcmp (entry, "persistent") == 0)
 213         {
 214           int idx = find_db (arg1);
 215           if (idx >= 0)
 216             {
 217               if (strcmp (arg2, "no") == 0)
 218                 dbs[idx].persistent = 0;
 219               else if (strcmp (arg2, "yes") == 0)
 220                 dbs[idx].persistent = 1;
 221             }
 222         }
 223       else if (strcmp (entry, "shared") == 0)
 224         {
 225           int idx = find_db (arg1);
 226           if (idx >= 0)
 227             {
 228               if (strcmp (arg2, "no") == 0)
 229                 dbs[idx].shared = 0;
 230               else if (strcmp (arg2, "yes") == 0)
 231                 dbs[idx].shared = 1;
 232             }
 233         }
 234       else if (strcmp (entry, "reload-count") == 0)
 235         {
 236           if (strcasecmp (arg1, "unlimited") == 0)
 237             reload_count = UINT_MAX;
 238           else
 239             {
 240               unsigned long int count = strtoul (arg1, NULL, 0);
 241               if (count > UINT8_MAX - 1)
 242                 reload_count = UINT_MAX;
 243               else
 244                 reload_count = count;
 245             }
 246         }
 247       else if (strcmp (entry, "paranoia") == 0)
 248         {
 249           if (strcmp (arg1, "no") == 0)
 250             paranoia = 0;
 251           else if (strcmp (arg1, "yes") == 0)
 252             paranoia = 1;
 253         }
 254       else if (strcmp (entry, "restart-interval") == 0)
 255         {
 256           if (arg1 != NULL)
 257             restart_interval = atol (arg1);
 258           else
 259             error (0, 0, _("Must specify value for restart-interval option"));
 260         }
 261       else if (strcmp (entry, "auto-propagate") == 0)
 262         {
 263           int idx = find_db (arg1);
 264           if (idx >= 0)
 265             {
 266               if (strcmp (arg2, "no") == 0)
 267                 dbs[idx].propagate = 0;
 268               else if (strcmp (arg2, "yes") == 0)
 269                 dbs[idx].propagate = 1;
 270             }
 271         }
 272       else
 273         error (0, 0, _("Unknown option: %s %s %s"), entry, arg1, arg2);
 274     }
 275   while (!feof_unlocked (fp));
 276
 277   if (paranoia)
 278     {
 279       restart_time = time (NULL) + restart_interval;
 280
 281       /* Save the old current workding directory if we are in paranoia
 282          mode.  We have to change back to it.  */
 283       oldcwd = get_current_dir_name ();
 284       if (oldcwd == NULL)
 285         {
 286           error (0, 0, _("\
 287 cannot get current working directory: %s; disabling paranoia mode"),
 288                    strerror (errno));
 289           paranoia = 0;
 290         }
 291     }
 292
 293   /* Enforce sanity.  */
 294   if (max_nthreads < nthreads)
 295     max_nthreads = nthreads;
 296
 297   for (cnt = 0; cnt < lastdb; ++cnt)
 298     {
 299       size_t datasize = (sizeof (struct database_pers_head)
 300                          + roundup (dbs[cnt].suggested_module
 301                                     * sizeof (ref_t), ALIGN)
 302                          + (dbs[cnt].suggested_module
 303                             * DEFAULT_DATASIZE_PER_BUCKET));
 304       if (datasize > dbs[cnt].max_db_size)
 305         {
 306           error (0, 0, _("maximum file size for %s database too small"),
 307                    dbnames[cnt]);
 308           dbs[cnt].max_db_size = datasize;
 309         }
 310
 311     }
 312
 313   /* Free the buffer.  */
 314   free (line);
 315   /* Close configuration file.  */
 316   fclose (fp);
 317
 318   return error_message_count != initial_error_message_count;
 319 }