nscd/nscd_conf.c

   1 /* Copyright (c) 1998-2013 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 <http://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 /* Wrapper functions with error checking for standard functions.  */
  36 extern char *xstrdup (const char *s);
  37
  38
  39 /* Names of the databases.  */
  40 const char *const dbnames[lastdb] =
  41 {
  42   [pwddb] = "passwd",
  43   [grpdb] = "group",
  44   [hstdb] = "hosts",
  45   [servdb] = "services",
  46   [netgrdb] = "netgroup"
  47 };
  48
  49
  50 static int
  51 find_db (const char *name)
  52 {
  53   for (int cnt = 0; cnt < lastdb; ++cnt)
  54     if (strcmp (name, dbnames[cnt]) == 0)
  55       return cnt;
  56
  57   error (0, 0, _("database %s is not supported"), name);
  58   return -1;
  59 }
  60
  61 int
  62 nscd_parse_file (const char *fname, struct database_dyn dbs[lastdb])
  63 {
  64   FILE *fp;
  65   char *line, *cp, *entry, *arg1, *arg2;
  66   size_t len;
  67   int cnt;
  68   const unsigned int initial_error_message_count = error_message_count;
  69
  70   /* Open the configuration file.  */
  71   fp = fopen (fname, "r");
  72   if (fp == NULL)
  73     return -1;
  74
  75   /* The stream is not used by more than one thread.  */
  76   (void) __fsetlocking (fp, FSETLOCKING_BYCALLER);
  77
  78   line = NULL;
  79   len = 0;
  80
  81   do
  82     {
  83       ssize_t n = getline (&line, &len, fp);
  84       if (n < 0)
  85         break;
  86       if (line[n - 1] == '\n')
  87         line[n - 1] = '\0';
  88
  89       /* Because the file format does not know any form of quoting we
  90          can search forward for the next '#' character and if found
  91          make it terminating the line.  */
  92       *strchrnul (line, '#') = '\0';
  93
  94       /* If the line is blank it is ignored.  */
  95       if (line[0] == '\0')
  96         continue;
  97
  98       entry = line;
  99       while (isspace (*entry) && *entry != '\0')
 100         ++entry;
 101       cp = entry;
 102       while (!isspace (*cp) && *cp != '\0')
 103         ++cp;
 104       arg1 = cp;
 105       ++arg1;
 106       *cp = '\0';
 107       if (strlen (entry) == 0)
 108         error (0, 0, _("Parse error: %s"), line);
 109       while (isspace (*arg1) && *arg1 != '\0')
 110         ++arg1;
 111       cp = arg1;
 112       while (!isspace (*cp) && *cp != '\0')
 113         ++cp;
 114       arg2 = cp;
 115       ++arg2;
 116       *cp = '\0';
 117       if (strlen (arg2) > 0)
 118         {
 119           while (isspace (*arg2) && *arg2 != '\0')
 120             ++arg2;
 121           cp = arg2;
 122           while (!isspace (*cp) && *cp != '\0')
 123             ++cp;
 124           *cp = '\0';
 125         }
 126
 127       if (strcmp (entry, "positive-time-to-live") == 0)
 128         {
 129           int idx = find_db (arg1);
 130           if (idx >= 0)
 131             dbs[idx].postimeout = atol (arg2);
 132         }
 133       else if (strcmp (entry, "negative-time-to-live") == 0)
 134         {
 135           int idx = find_db (arg1);
 136           if (idx >= 0)
 137             dbs[idx].negtimeout = atol (arg2);
 138         }
 139       else if (strcmp (entry, "suggested-size") == 0)
 140         {
 141           int idx = find_db (arg1);
 142           if (idx >= 0)
 143             dbs[idx].suggested_module
 144               = atol (arg2) ?: DEFAULT_SUGGESTED_MODULE;
 145         }
 146       else if (strcmp (entry, "enable-cache") == 0)
 147         {
 148           int idx = find_db (arg1);
 149           if (idx >= 0)
 150             {
 151               if (strcmp (arg2, "no") == 0)
 152                 dbs[idx].enabled = 0;
 153               else if (strcmp (arg2, "yes") == 0)
 154                 dbs[idx].enabled = 1;
 155             }
 156         }
 157       else if (strcmp (entry, "check-files") == 0)
 158         {
 159           int idx = find_db (arg1);
 160           if (idx >= 0)
 161             {
 162               if (strcmp (arg2, "no") == 0)
 163                 dbs[idx].check_file = 0;
 164               else if (strcmp (arg2, "yes") == 0)
 165                 dbs[idx].check_file = 1;
 166             }
 167         }
 168       else if (strcmp (entry, "max-db-size") == 0)
 169         {
 170           int idx = find_db (arg1);
 171           if (idx >= 0)
 172             dbs[idx].max_db_size = atol (arg2) ?: DEFAULT_MAX_DB_SIZE;
 173         }
 174       else if (strcmp (entry, "logfile") == 0)
 175         set_logfile (arg1);
 176       else if (strcmp (entry, "debug-level") == 0)
 177         {
 178           int level = atoi (arg1);
 179           if (level > 0)
 180             debug_level = level;
 181         }
 182       else if (strcmp (entry, "threads") == 0)
 183         {
 184           if (nthreads == -1)
 185             nthreads = MAX (atol (arg1), lastdb);
 186         }
 187       else if (strcmp (entry, "max-threads") == 0)
 188         {
 189           max_nthreads = MAX (atol (arg1), lastdb);
 190         }
 191       else if (strcmp (entry, "server-user") == 0)
 192         {
 193           if (!arg1)
 194             error (0, 0, _("Must specify user name for server-user option"));
 195           else
 196             server_user = xstrdup (arg1);
 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               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 }