nscd/nscd_conf.c

   1 /* Copyright (c) 1998, 2000, 2003, 2004, 2005 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    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 <ctype.h>
  21 #include <errno.h>
  22 #include <error.h>
  23 #include <libintl.h>
  24 #include <malloc.h>
  25 #include <pwd.h>
  26 #include <stdio.h>
  27 #include <stdio_ext.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31 #include <sys/param.h>
  32 #include <sys/types.h>
  33
  34 #include "dbg_log.h"
  35 #include "nscd.h"
  36
  37 /* Wrapper functions with error checking for standard functions.  */
  38 extern char *xstrdup (const char *s);
  39
  40
  41 /* Names of the databases.  */
  42 const char *dbnames[lastdb] =
  43 {
  44   [pwddb] = "passwd",
  45   [grpdb] = "group",
  46   [hstdb] = "hosts"
  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\n"), 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 = atol (arg2);
 144         }
 145       else if (strcmp (entry, "enable-cache") == 0)
 146         {
 147           int idx = find_db (arg1);
 148           if (idx >= 0)
 149             {
 150               if (strcmp (arg2, "no") == 0)
 151                 dbs[idx].enabled = 0;
 152               else if (strcmp (arg2, "yes") == 0)
 153                 dbs[idx].enabled = 1;
 154             }
 155         }
 156       else if (strcmp (entry, "check-files") == 0)
 157         {
 158           int idx = find_db (arg1);
 159           if (idx >= 0)
 160             {
 161               if (strcmp (arg2, "no") == 0)
 162                 dbs[idx].check_file = 0;
 163               else if (strcmp (arg2, "yes") == 0)
 164                 dbs[idx].check_file = 1;
 165             }
 166         }
 167       else if (strcmp (entry, "max-db-size") == 0)
 168         {
 169           int idx = find_db (arg1);
 170           if (idx >= 0)
 171             dbs[idx].max_db_size = atol (arg2);
 172         }
 173       else if (strcmp (entry, "logfile") == 0)
 174         set_logfile (arg1);
 175       else if (strcmp (entry, "debug-level") == 0)
 176         {
 177           int level = atoi (arg1);
 178           if (level > 0)
 179             debug_level = level;
 180         }
 181       else if (strcmp (entry, "threads") == 0)
 182         {
 183           if (nthreads == -1)
 184             nthreads = MAX (atol (arg1), lastdb);
 185         }
 186       else if (strcmp (entry, "max-threads") == 0)
 187         {
 188           max_nthreads = MAX (atol (arg1), lastdb);
 189         }
 190       else if (strcmp (entry, "server-user") == 0)
 191         {
 192           if (!arg1)
 193             error (0, 0, _("Must specify user name for server-user option"));
 194           else
 195             server_user = xstrdup (arg1);
 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               stat_user = xstrdup (arg1);
 204
 205               struct passwd *pw = getpwnam (stat_user);
 206               if (pw != NULL)
 207                 stat_uid = pw->pw_uid;
 208             }
 209         }
 210       else if (strcmp (entry, "persistent") == 0)
 211         {
 212           int idx = find_db (arg1);
 213           if (idx >= 0)
 214             {
 215               if (strcmp (arg2, "no") == 0)
 216                 dbs[idx].persistent = 0;
 217               else if (strcmp (arg2, "yes") == 0)
 218                 dbs[idx].persistent = 1;
 219             }
 220         }
 221       else if (strcmp (entry, "shared") == 0)
 222         {
 223           int idx = find_db (arg1);
 224           if (idx >= 0)
 225             {
 226               if (strcmp (arg2, "no") == 0)
 227                 dbs[idx].shared = 0;
 228               else if (strcmp (arg2, "yes") == 0)
 229                 dbs[idx].shared = 1;
 230             }
 231         }
 232       else if (strcmp (entry, "reload-count") == 0)
 233         {
 234           if (strcasecmp (arg1, "unlimited") == 0)
 235             reload_count = UINT_MAX;
 236           else
 237             {
 238               unsigned int count = strtoul (arg1, NULL, 0);
 239               if (count > UINT8_MAX - 1)
 240                 reload_count = UINT_MAX;
 241               else if (count >= 0)
 242             reload_count = count;
 243               else
 244                 error (0, 0, _("invalid value for 'reload-count': %u"), 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
 262         error (0, 0, _("Unknown option: %s %s %s"), entry, arg1, arg2);
 263     }
 264   while (!feof_unlocked (fp));
 265
 266   if (paranoia)
 267     {
 268       restart_time = time (NULL) + restart_interval;
 269
 270       /* Save the old current workding directory if we are in paranoia
 271          mode.  We have to change back to it.  */
 272       oldcwd = get_current_dir_name ();
 273       if (oldcwd == NULL)
 274         {
 275           error (0, 0, _("\
 276 cannot get current working directory: %s; disabling paranoia mode"),
 277                    strerror (errno));
 278           paranoia = 0;
 279         }
 280     }
 281
 282   /* Enforce sanity.  */
 283   if (max_nthreads < nthreads)
 284     max_nthreads = nthreads;
 285
 286   for (cnt = 0; cnt < lastdb; ++cnt)
 287     {
 288       size_t datasize = (sizeof (struct database_pers_head)
 289                          + roundup (dbs[cnt].suggested_module
 290                                     * sizeof (ref_t), ALIGN)
 291                          + (dbs[cnt].suggested_module
 292                             * DEFAULT_DATASIZE_PER_BUCKET));
 293       if (datasize > dbs[cnt].max_db_size)
 294         {
 295           error (0, 0, _("maximum file size for %s database too small"),
 296                    dbnames[cnt]);
 297           dbs[cnt].max_db_size = datasize;
 298         }
 299
 300     }
 301
 302   /* Free the buffer.  */
 303   free (line);
 304   /* Close configuration file.  */
 305   fclose (fp);
 306
 307   return error_message_count != initial_error_message_count;
 308 }