nscd/nscd_conf.c

   1 /* Copyright (c) 1998-2022 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published
   6    by the Free Software Foundation; version 2 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, see <https://www.gnu.org/licenses/>.  */
  16
  17 #include <ctype.h>
  18 #include <errno.h>
  19 #include <error.h>
  20 #include <libintl.h>
  21 #include <malloc.h>
  22 #include <pwd.h>
  23 #include <stdio.h>
  24 #include <stdio_ext.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <unistd.h>
  28 #include <sys/param.h>
  29 #include <sys/types.h>
  30
  31 #include "dbg_log.h"
  32 #include "nscd.h"
  33
  34
  35 /* Names of the databases.  */
  36 const char *const dbnames[lastdb] =
  37 {
  38   [pwddb] = "passwd",
  39   [grpdb] = "group",
  40   [hstdb] = "hosts",
  41   [servdb] = "services",
  42   [netgrdb] = "netgroup"
  43 };
  44
  45
  46 static int
  47 find_db (const char *name)
  48 {
  49   for (int cnt = 0; cnt < lastdb; ++cnt)
  50     if (strcmp (name, dbnames[cnt]) == 0)
  51       return cnt;
  52
  53   error (0, 0, _("database %s is not supported"), name);
  54   return -1;
  55 }
  56
  57 int
  58 nscd_parse_file (const char *fname, struct database_dyn dbs[lastdb])
  59 {
  60   FILE *fp;
  61   char *line, *cp, *entry, *arg1, *arg2;
  62   size_t len;
  63   int cnt;
  64   const unsigned int initial_error_message_count = error_message_count;
  65
  66   /* Open the configuration file.  */
  67   fp = fopen (fname, "r");
  68   if (fp == NULL)
  69     return -1;
  70
  71   /* The stream is not used by more than one thread.  */
  72   (void) __fsetlocking (fp, FSETLOCKING_BYCALLER);
  73
  74   line = NULL;
  75   len = 0;
  76
  77   do
  78     {
  79       ssize_t n = getline (&line, &len, fp);
  80       if (n < 0)
  81         break;
  82       if (line[n - 1] == '\n')
  83         line[n - 1] = '\0';
  84
  85       /* Because the file format does not know any form of quoting we
  86          can search forward for the next '#' character and if found
  87          make it terminating the line.  */
  88       *strchrnul (line, '#') = '\0';
  89
  90       /* If the line is blank it is ignored.  */
  91       if (line[0] == '\0')
  92         continue;
  93
  94       entry = line;
  95       while (isspace (*entry) && *entry != '\0')
  96         ++entry;
  97       cp = entry;
  98       while (!isspace (*cp) && *cp != '\0')
  99         ++cp;
 100       arg1 = cp;
 101       ++arg1;
 102       *cp = '\0';
 103       if (strlen (entry) == 0)
 104         error (0, 0, _("Parse error: %s"), line);
 105       while (isspace (*arg1) && *arg1 != '\0')
 106         ++arg1;
 107       cp = arg1;
 108       while (!isspace (*cp) && *cp != '\0')
 109         ++cp;
 110       arg2 = cp;
 111       ++arg2;
 112       *cp = '\0';
 113       if (strlen (arg2) > 0)
 114         {
 115           while (isspace (*arg2) && *arg2 != '\0')
 116             ++arg2;
 117           cp = arg2;
 118           while (!isspace (*cp) && *cp != '\0')
 119             ++cp;
 120           *cp = '\0';
 121         }
 122
 123       if (strcmp (entry, "positive-time-to-live") == 0)
 124         {
 125           int idx = find_db (arg1);
 126           if (idx >= 0)
 127             dbs[idx].postimeout = atol (arg2);
 128         }
 129       else if (strcmp (entry, "negative-time-to-live") == 0)
 130         {
 131           int idx = find_db (arg1);
 132           if (idx >= 0)
 133             dbs[idx].negtimeout = atol (arg2);
 134         }
 135       else if (strcmp (entry, "suggested-size") == 0)
 136         {
 137           int idx = find_db (arg1);
 138           if (idx >= 0)
 139             dbs[idx].suggested_module
 140               = atol (arg2) ?: DEFAULT_SUGGESTED_MODULE;
 141         }
 142       else if (strcmp (entry, "enable-cache") == 0)
 143         {
 144           int idx = find_db (arg1);
 145           if (idx >= 0)
 146             {
 147               if (strcmp (arg2, "no") == 0)
 148                 dbs[idx].enabled = 0;
 149               else if (strcmp (arg2, "yes") == 0)
 150                 dbs[idx].enabled = 1;
 151             }
 152         }
 153       else if (strcmp (entry, "check-files") == 0)
 154         {
 155           int idx = find_db (arg1);
 156           if (idx >= 0)
 157             {
 158               if (strcmp (arg2, "no") == 0)
 159                 dbs[idx].check_file = 0;
 160               else if (strcmp (arg2, "yes") == 0)
 161                 dbs[idx].check_file = 1;
 162             }
 163         }
 164       else if (strcmp (entry, "max-db-size") == 0)
 165         {
 166           int idx = find_db (arg1);
 167           if (idx >= 0)
 168             dbs[idx].max_db_size = atol (arg2) ?: DEFAULT_MAX_DB_SIZE;
 169         }
 170       else if (strcmp (entry, "logfile") == 0)
 171         set_logfile (arg1);
 172       else if (strcmp (entry, "debug-level") == 0)
 173         {
 174           int level = atoi (arg1);
 175           if (level > 0)
 176             debug_level = level;
 177         }
 178       else if (strcmp (entry, "threads") == 0)
 179         {
 180           if (nthreads == -1)
 181             nthreads = MAX (atol (arg1), lastdb);
 182         }
 183       else if (strcmp (entry, "max-threads") == 0)
 184         {
 185           max_nthreads = MAX (atol (arg1), lastdb);
 186         }
 187       else if (strcmp (entry, "server-user") == 0)
 188         {
 189           if (!arg1)
 190             error (0, 0, _("Must specify user name for server-user option"));
 191           else
 192             {
 193               free ((char *) server_user);
 194               server_user = xstrdup (arg1);
 195             }
 196         }
 197       else if (strcmp (entry, "stat-user") == 0)
 198         {
 199           if (arg1 == NULL)
 200             error (0, 0, _("Must specify user name for stat-user option"));
 201           else
 202             {
 203               free ((char *) stat_user);
 204               stat_user = xstrdup (arg1);
 205
 206               struct passwd *pw = getpwnam (stat_user);
 207               if (pw != NULL)
 208                 stat_uid = pw->pw_uid;
 209             }
 210         }
 211       else if (strcmp (entry, "persistent") == 0)
 212         {
 213           int idx = find_db (arg1);
 214           if (idx >= 0)
 215             {
 216               if (strcmp (arg2, "no") == 0)
 217                 dbs[idx].persistent = 0;
 218               else if (strcmp (arg2, "yes") == 0)
 219                 dbs[idx].persistent = 1;
 220             }
 221         }
 222       else if (strcmp (entry, "shared") == 0)
 223         {
 224           int idx = find_db (arg1);
 225           if (idx >= 0)
 226             {
 227               if (strcmp (arg2, "no") == 0)
 228                 dbs[idx].shared = 0;
 229               else if (strcmp (arg2, "yes") == 0)
 230                 dbs[idx].shared = 1;
 231             }
 232         }
 233       else if (strcmp (entry, "reload-count") == 0)
 234         {
 235           if (strcasecmp (arg1, "unlimited") == 0)
 236             reload_count = UINT_MAX;
 237           else
 238             {
 239               unsigned long int count = strtoul (arg1, NULL, 0);
 240               if (count > UINT8_MAX - 1)
 241                 reload_count = UINT_MAX;
 242               else
 243                 reload_count = count;
 244             }
 245         }
 246       else if (strcmp (entry, "paranoia") == 0)
 247         {
 248           if (strcmp (arg1, "no") == 0)
 249             paranoia = 0;
 250           else if (strcmp (arg1, "yes") == 0)
 251             paranoia = 1;
 252         }
 253       else if (strcmp (entry, "restart-interval") == 0)
 254         {
 255           if (arg1 != NULL)
 256             restart_interval = atol (arg1);
 257           else
 258             error (0, 0, _("Must specify value for restart-interval option"));
 259         }
 260       else if (strcmp (entry, "auto-propagate") == 0)
 261         {
 262           int idx = find_db (arg1);
 263           if (idx >= 0)
 264             {
 265               if (strcmp (arg2, "no") == 0)
 266                 dbs[idx].propagate = 0;
 267               else if (strcmp (arg2, "yes") == 0)
 268                 dbs[idx].propagate = 1;
 269             }
 270         }
 271       else
 272         error (0, 0, _("Unknown option: %s %s %s"), entry, arg1, arg2);
 273     }
 274   while (!feof_unlocked (fp));
 275
 276   if (paranoia)
 277     {
 278       restart_time = time (NULL) + restart_interval;
 279
 280       /* Save the old current workding directory if we are in paranoia
 281          mode.  We have to change back to it.  */
 282       oldcwd = get_current_dir_name ();
 283       if (oldcwd == NULL)
 284         {
 285           error (0, 0, _("\
 286 cannot get current working directory: %s; disabling paranoia mode"),
 287                    strerror (errno));
 288           paranoia = 0;
 289         }
 290     }
 291
 292   /* Enforce sanity.  */
 293   if (max_nthreads < nthreads)
 294     max_nthreads = nthreads;
 295
 296   for (cnt = 0; cnt < lastdb; ++cnt)
 297     {
 298       size_t datasize = (sizeof (struct database_pers_head)
 299                          + roundup (dbs[cnt].suggested_module
 300                                     * sizeof (ref_t), ALIGN)
 301                          + (dbs[cnt].suggested_module
 302                             * DEFAULT_DATASIZE_PER_BUCKET));
 303       if (datasize > dbs[cnt].max_db_size)
 304         {
 305           error (0, 0, _("maximum file size for %s database too small"),
 306                    dbnames[cnt]);
 307           dbs[cnt].max_db_size = datasize;
 308         }
 309
 310     }
 311
 312   /* Free the buffer.  */
 313   free (line);
 314   /* Close configuration file.  */
 315   fclose (fp);
 316
 317   return error_message_count != initial_error_message_count;
 318 }