g13/backend.c

   1 /* backend.c - Dispatcher to the various backends.
   2  * Copyright (C) 2009 Free Software Foundation, Inc.
   3  *
   4  * This file is part of GnuPG.
   5  *
   6  * GnuPG is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * GnuPG is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <config.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <errno.h>
  25 #include <unistd.h>
  26
  27 #include "g13.h"
  28 #include "i18n.h"
  29 #include "keyblob.h"
  30 #include "backend.h"
  31 #include "be-encfs.h"
  32 #include "be-truecrypt.h"
  33
  34
  35 static gpg_error_t
  36 no_such_backend (int conttype)
  37 {
  38   log_error ("invalid backend %d given - this is most likely a bug\n",
  39              conttype);
  40   return gpg_error (GPG_ERR_INTERNAL);
  41 }
  42
  43
  44 /* Return true if CONTTYPE is supported by us.  */
  45 int
  46 be_is_supported_conttype (int conttype)
  47 {
  48   switch (conttype)
  49     {
  50     case CONTTYPE_ENCFS:
  51       return 1;
  52
  53     default:
  54       return 0;
  55     }
  56 }
  57
  58
  59
  60 /* If the backend requires a separate file or directory for the
  61    container, return its name by computing it from FNAME which gives
  62    the g13 filename.  The new file name is allocated and stored at
  63    R_NAME, if this is expected to be a directory true is stored at
  64    R_ISDIR.  If no detached name is expected or an error occurs NULL
  65    is stored at R_NAME. The function returns 0 on success or an error
  66    code.  */
  67 gpg_error_t
  68 be_get_detached_name (int conttype, const char *fname,
  69                       char **r_name, int *r_isdir)
  70 {
  71   *r_name = NULL;
  72   *r_isdir = 0;
  73   switch (conttype)
  74     {
  75     case CONTTYPE_ENCFS:
  76       return be_encfs_get_detached_name (fname, r_name, r_isdir);
  77
  78     default:
  79       return no_such_backend (conttype);
  80     }
  81 }
  82
  83
  84 gpg_error_t
  85 be_create_new_keys (int conttype, membuf_t *mb)
  86 {
  87   switch (conttype)
  88     {
  89     case CONTTYPE_ENCFS:
  90       return be_encfs_create_new_keys (mb);
  91
  92     case CONTTYPE_TRUECRYPT:
  93       return be_truecrypt_create_new_keys (mb);
  94
  95     default:
  96       return no_such_backend (conttype);
  97     }
  98 }
  99
 100
 101 /*  Dispatcher to the backend's create function.  */
 102 gpg_error_t
 103 be_create_container (ctrl_t ctrl, int conttype,
 104                      const char *fname, int fd, tupledesc_t tuples,
 105                      unsigned int *r_id)
 106 {
 107   (void)fd;  /* Not yet used.  */
 108
 109   switch (conttype)
 110     {
 111     case CONTTYPE_ENCFS:
 112       return be_encfs_create_container (ctrl, fname, tuples, r_id);
 113
 114     default:
 115       return no_such_backend (conttype);
 116     }
 117 }
 118
 119
 120 /*  Dispatcher to the backend's mount function.  */
 121 gpg_error_t
 122 be_mount_container (ctrl_t ctrl, int conttype,
 123                     const char *fname,  const char *mountpoint,
 124                     tupledesc_t tuples, unsigned int *r_id)
 125 {
 126   switch (conttype)
 127     {
 128     case CONTTYPE_ENCFS:
 129       return be_encfs_mount_container (ctrl, fname, mountpoint, tuples, r_id);
 130
 131     default:
 132       return no_such_backend (conttype);
 133     }
 134 }