src/cache.h

   1 /*
   2     Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015,
   3     2016
   4     Ben Kibbey <bjk@luxsci.net>
   5
   6     This file is part of pwmd.
   7
   8     Pwmd is free software: you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation, either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     Pwmd is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License
  19     along with Pwmd.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21 #ifndef CACHE_H
  22 #define CACHE_H
  23
  24 #include <pthread.h>
  25 #include <gpg-error.h>
  26 #include <time.h>
  27
  28 #include "crypto.h"
  29
  30 struct cache_data_s
  31 {
  32   char **pubkey;        /* keyid's */
  33   char **sigkey;        /* keyid's */
  34   void *doc;            /* AES-128 encrypted */
  35   size_t size;
  36   unsigned char *crc;   /* Checksum of the data file. */
  37 };
  38
  39 typedef struct
  40 {
  41   unsigned char filename[16];   /* MD5 hash. */
  42   int timeout;                  /* cache_timer_thread(). */
  43   int reset;                    /* To reset .timeout. */
  44   int defer_clear;              /* Another thread wants to clear the cache
  45                                    entry for this file. Prevent resetting the
  46                                    timer until this flag is cleared. */
  47   pthread_mutex_t *mutex;       /* Data file mutex. */
  48   struct cache_data_s *data;
  49   unsigned refcount;
  50 } file_cache_t;
  51
  52 void cache_adjust_timeout ();
  53 gpg_error_t cache_set_timeout (const unsigned char *md5filename, int timeout);
  54 gpg_error_t cache_iscached (const char *filename, int *defer);
  55 gpg_error_t cache_clear (const unsigned char *md5filename);
  56 gpg_error_t cache_add_file (const unsigned char *md5file,
  57                             struct cache_data_s *, int timeout);
  58 void cache_deinit ();
  59 gpg_error_t cache_init ();
  60 void cache_mutex_init ();
  61 unsigned cache_file_count ();
  62 struct cache_data_s *cache_get_data (const unsigned char *md5file);
  63 struct cache_data_s *cache_get_data_filename (const char *file);
  64 gpg_error_t cache_set_data (const unsigned char *md5file,
  65                             struct cache_data_s *);
  66 gpg_error_t cache_lock_mutex (void *ctx, const unsigned char *md5file,
  67                               long mutex_timeout, int add, int timeout);
  68 gpg_error_t cache_unlock_mutex (const unsigned char *md5file, int remove);
  69 void cache_lock ();
  70 void cache_unlock ();
  71 void free_cache_data_once (struct cache_data_s *data);
  72 gpg_error_t cache_defer_clear (const unsigned char *md5file);
  73 gpg_error_t cache_encrypt (struct crypto_s *);
  74 gpg_error_t cache_decrypt (struct crypto_s *);
  75
  76 #endif