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    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License version 2 as
   7    published by the Free Software Foundation.
   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, write to the Free Software Foundation,
  16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  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 *dbnames[lastdb] =
  41 {
  42   [pwddb] = "passwd",
  43   [grpdb] = "group",
  44   [hstdb] = "hosts"
  45 };
  46
  47
  48 static int
  49 find_db (const char *name)
  50 {
  51   for (int cnt = 0; cnt < lastdb; ++cnt)
  52     if (strcmp (name, dbnames[cnt]) == 0)
  53       return cnt;
  54
  55   error (0, 0, _("database %s is not supported\n"), name);
  56   return -1;
  57 }
  58
  59 int
  60 nscd_parse_file (const char *fname, struct database_dyn dbs[lastdb])
  61 {
  62   FILE *fp;
  63   char *line, *cp, *entry, *arg1, *arg2;
  64   size_t len;
  65   int cnt;
  66   const unsigned int initial_error_message_count = error_message_count;
  67
  68   /* Open the configuration file.  */
  69   fp = fopen (fname, "r");
  70   if (fp == NULL)
  71     return -1;
  72
  73   /* The stream is not used by more than one thread.  */
  74   (void) __fsetlocking (fp, FSETLOCKING_BYCALLER);
  75
  76   line = NULL;
  77   len = 0;
  78
  79   do
  80     {
  81       ssize_t n = getline (&line, &len, fp);
  82       if (n < 0)
  83         break;
  84       if (line[n - 1] == '\n')
  85         line[n - 1] = '\0';
  86
  87       /* Because the file format does not know any form of quoting we
  88          can search forward for the next '#' character and if found
  89          make it terminating the line.  */
  90       *strchrnul (line, '#') = '\0';
  91
  92       /* If the line is blank it is ignored.  */
  93       if (line[0] == '\0')
  94         continue;
  95
  96       entry = line;
  97       while (isspace (*entry) && *entry != '\0')
  98         ++entry;
  99       cp = entry;
 100       while (!isspace (*cp) && *cp != '\0')
 101         ++cp;
 102       arg1 = cp;
 103       ++arg1;
 104       *cp = '\0';
 105       if (strlen (entry) == 0)
 106         error (0, 0, _("Parse error: %s"), line);
 107       while (isspace (*arg1) && *arg1 != '\0')
 108         ++arg1;
 109       cp = arg1;
 110       while (!isspace (*cp) && *cp != '\0')
 111         ++cp;
 112       arg2 = cp;
 113       ++arg2;
 114       *cp = '\0';
 115       if (strlen (arg2) > 0)
 116         {
 117           while (isspace (*arg2) && *arg2 != '\0')
 118             ++arg2;
 119           cp = arg2;
 120           while (!isspace (*cp) && *cp != '\0')
 121             ++cp;
 122           *cp = '\0';
 123         }
 124
 125       if (strcmp (entry, "positive-time-to-live") == 0)
 126         {
 127           int idx = find_db (arg1);
 128           if (idx >= 0)
 129             dbs[idx].postimeout = atol (arg2);
 130         }
 131       else if (strcmp (entry, "negative-time-to-live") == 0)
 132         {
 133           int idx = find_db (arg1);
 134           if (idx >= 0)
 135             dbs[idx].negtimeout = atol (arg2);
 136         }
 137       else if (strcmp (entry, "suggested-size") == 0)
 138         {
 139           int idx = find_db (arg1);
 140           if (idx >= 0)
 141             dbs[idx].suggested_module = atol (arg2);
 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);
 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             server_user = xstrdup (arg1);
 194         }
 195       else if (strcmp (entry, "stat-user") == 0)
 196         {
 197           if (arg1 == NULL)
 198             error (0, 0, _("Must specify user name for stat-user option"));
 199           else
 200             {
 201               stat_user = xstrdup (arg1);
 202
 203               struct passwd *pw = getpwnam (stat_user);
 204               if (pw != NULL)
 205                 stat_uid = pw->pw_uid;
 206             }
 207         }
 208       else if (strcmp (entry, "persistent") == 0)
 209         {
 210           int idx = find_db (arg1);
 211           if (idx >= 0)
 212             {
 213               if (strcmp (arg2, "no") == 0)
 214                 dbs[idx].persistent = 0;
 215               else if (strcmp (arg2, "yes") == 0)
 216                 dbs[idx].persistent = 1;
 217             }
 218         }
 219       else if (strcmp (entry, "shared") == 0)
 220         {
 221           int idx = find_db (arg1);
 222           if (idx >= 0)
 223             {
 224               if (strcmp (arg2, "no") == 0)
 225                 dbs[idx].shared = 0;
 226               else if (strcmp (arg2, "yes") == 0)
 227                 dbs[idx].shared = 1;
 228             }
 229         }
 230       else if (strcmp (entry, "reload-count") == 0)
 231         {
 232           if (strcasecmp (arg1, "unlimited") == 0)
 233             reload_count = UINT_MAX;
 234           else
 235             {
 236               unsigned int count = strtoul (arg1, NULL, 0);
 237               if (count > UINT8_MAX - 1)
 238                 reload_count = UINT_MAX;
 239               else if (count >= 0)
 240             reload_count = count;
 241               else
 242                 error (0, 0, _("invalid value for 'reload-count': %u"), count);
 243             }
 244         }
 245       else if (strcmp (entry, "paranoia") == 0)
 246         {
 247           if (strcmp (arg1, "no") == 0)
 248             paranoia = 0;
 249           else if (strcmp (arg1, "yes") == 0)
 250             paranoia = 1;
 251         }
 252       else if (strcmp (entry, "restart-interval") == 0)
 253         {
 254           if (arg1 != NULL)
 255             restart_interval = atol (arg1);
 256           else
 257             error (0, 0, _("Must specify value for restart-interval option"));
 258         }
 259       else
 260         error (0, 0, _("Unknown option: %s %s %s"), entry, arg1, arg2);
 261     }
 262   while (!feof_unlocked (fp));
 263
 264   if (paranoia)
 265     {
 266       restart_time = time (NULL) + restart_interval;
 267
 268       /* Save the old current workding directory if we are in paranoia
 269          mode.  We have to change back to it.  */
 270       oldcwd = get_current_dir_name ();
 271       if (oldcwd == NULL)
 272         {
 273           error (0, 0, _("\
 274 cannot get current working directory: %s; disabling paranoia mode"),
 275                    strerror (errno));
 276           paranoia = 0;
 277         }
 278     }
 279
 280   /* Enforce sanity.  */
 281   if (max_nthreads < nthreads)
 282     max_nthreads = nthreads;
 283
 284   for (cnt = 0; cnt < lastdb; ++cnt)
 285     {
 286       size_t datasize = (sizeof (struct database_pers_head)
 287                          + roundup (dbs[cnt].suggested_module
 288                                     * sizeof (ref_t), ALIGN)
 289                          + (dbs[cnt].suggested_module
 290                             * DEFAULT_DATASIZE_PER_BUCKET));
 291       if (datasize > dbs[cnt].max_db_size)
 292         {
 293           error (0, 0, _("maximum file size for %s database too small"),
 294                    dbnames[cnt]);
 295           dbs[cnt].max_db_size = datasize;
 296         }
 297
 298     }
 299
 300   /* Free the buffer.  */
 301   free (line);
 302   /* Close configuration file.  */
 303   fclose (fp);
 304
 305   return error_message_count != initial_error_message_count;
 306 }