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![Werner Koch](/assets/img/avatar_default.png)
* common/sysutils.c (gnupg_stat): New. * common/sysutils.h: Include sys/stat.h. -- Yet another wrapper for Unicode support on Windows. GnuPG-bug-id: 5098 Signed-off-by: Werner Koch <wk@gnupg.org>
297 lines
7.0 KiB
C
297 lines
7.0 KiB
C
/* backend.c - Dispatcher to the various backends.
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* Copyright (C) 2009 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <https://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include "g13.h"
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#include "../common/i18n.h"
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#include "../common/sysutils.h"
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#include "keyblob.h"
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#include "backend.h"
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#include "be-encfs.h"
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#include "be-truecrypt.h"
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#include "be-dmcrypt.h"
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#include "call-syshelp.h"
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#define no_such_backend(a) _no_such_backend ((a), __func__)
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static gpg_error_t
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_no_such_backend (int conttype, const char *func)
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{
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log_error ("invalid backend %d given in %s - this is most likely a bug\n",
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conttype, func);
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return gpg_error (GPG_ERR_INTERNAL);
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}
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/* Parse NAME and return the corresponding content type. If the name
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is not known, a error message is printed and zero returned. If
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NAME is NULL the supported backend types are listed and 0 is
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returned. */
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int
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be_parse_conttype_name (const char *name)
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{
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static struct { const char *name; int conttype; } names[] = {
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{ "encfs", CONTTYPE_ENCFS },
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{ "dm-crypt", CONTTYPE_DM_CRYPT }
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};
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int i;
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if (!name)
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{
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log_info ("Known backend types:\n");
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for (i=0; i < DIM (names); i++)
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log_info (" %s\n", names[i].name);
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return 0;
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}
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for (i=0; i < DIM (names); i++)
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{
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if (!strcmp (names[i].name, name))
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return names[i].conttype;
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}
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log_error ("invalid backend type '%s' given\n", name);
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return 0;
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}
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/* Return true if CONTTYPE is supported by us. */
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int
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be_is_supported_conttype (int conttype)
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{
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switch (conttype)
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{
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case CONTTYPE_ENCFS:
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case CONTTYPE_DM_CRYPT:
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return 1;
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default:
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return 0;
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}
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}
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/* Create a lock file for the container FNAME and store the lock at
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* R_LOCK and return 0. On error return an error code and store NULL
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* at R_LOCK. */
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gpg_error_t
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be_take_lock_for_create (ctrl_t ctrl, const char *fname, dotlock_t *r_lock)
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{
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gpg_error_t err;
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dotlock_t lock = NULL;
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struct stat sb;
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*r_lock = NULL;
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/* A DM-crypt container requires special treatment by using the
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syshelper functions. */
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if (ctrl->conttype == CONTTYPE_DM_CRYPT)
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{
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/* */
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err = call_syshelp_set_device (ctrl, fname);
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goto leave;
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}
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/* A quick check to see that no container with that name already
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exists. */
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if (!gnupg_access (fname, F_OK))
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{
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err = gpg_error (GPG_ERR_EEXIST);
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goto leave;
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}
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/* Take a lock and proceed with the creation. If there is a lock we
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immediately return an error because for creation it does not make
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sense to wait. */
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lock = dotlock_create (fname, 0);
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if (!lock)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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if (dotlock_take (lock, 0))
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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/* Check again that the file does not exist. */
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err = gnupg_stat (fname, &sb)? 0 : gpg_error (GPG_ERR_EEXIST);
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leave:
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if (!err)
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{
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*r_lock = lock;
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lock = NULL;
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}
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dotlock_destroy (lock);
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return err;
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}
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/* If the backend requires a separate file or directory for the
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container, return its name by computing it from FNAME which gives
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the g13 filename. The new file name is allocated and stored at
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R_NAME, if this is expected to be a directory true is stored at
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R_ISDIR. If no detached name is expected or an error occurs NULL
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is stored at R_NAME. The function returns 0 on success or an error
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code. */
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gpg_error_t
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be_get_detached_name (int conttype, const char *fname,
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char **r_name, int *r_isdir)
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{
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*r_name = NULL;
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*r_isdir = 0;
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switch (conttype)
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{
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case CONTTYPE_ENCFS:
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return be_encfs_get_detached_name (fname, r_name, r_isdir);
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case CONTTYPE_DM_CRYPT:
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return 0;
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default:
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return no_such_backend (conttype);
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}
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}
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gpg_error_t
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be_create_new_keys (int conttype, membuf_t *mb)
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{
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switch (conttype)
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{
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case CONTTYPE_ENCFS:
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return be_encfs_create_new_keys (mb);
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case CONTTYPE_TRUECRYPT:
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return be_truecrypt_create_new_keys (mb);
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case CONTTYPE_DM_CRYPT:
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return 0;
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default:
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return no_such_backend (conttype);
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}
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}
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/* Dispatcher to the backend's create function. */
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gpg_error_t
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be_create_container (ctrl_t ctrl, int conttype,
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const char *fname, int fd, tupledesc_t tuples,
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unsigned int *r_id)
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{
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(void)fd; /* Not yet used. */
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switch (conttype)
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{
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case CONTTYPE_ENCFS:
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return be_encfs_create_container (ctrl, fname, tuples, r_id);
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case CONTTYPE_DM_CRYPT:
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return be_dmcrypt_create_container (ctrl);
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default:
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return no_such_backend (conttype);
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}
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}
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/* Dispatcher to the backend's mount function. */
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gpg_error_t
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be_mount_container (ctrl_t ctrl, int conttype,
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const char *fname, const char *mountpoint,
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tupledesc_t tuples, unsigned int *r_id)
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{
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switch (conttype)
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{
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case CONTTYPE_ENCFS:
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return be_encfs_mount_container (ctrl, fname, mountpoint, tuples, r_id);
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case CONTTYPE_DM_CRYPT:
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return be_dmcrypt_mount_container (ctrl, fname, mountpoint, tuples);
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default:
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return no_such_backend (conttype);
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}
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}
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/* Dispatcher to the backend's umount function. */
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gpg_error_t
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be_umount_container (ctrl_t ctrl, int conttype, const char *fname)
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{
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switch (conttype)
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{
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case CONTTYPE_ENCFS:
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return gpg_error (GPG_ERR_NOT_SUPPORTED);
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case CONTTYPE_DM_CRYPT:
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return be_dmcrypt_umount_container (ctrl, fname);
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default:
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return no_such_backend (conttype);
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}
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}
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/* Dispatcher to the backend's suspend function. */
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gpg_error_t
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be_suspend_container (ctrl_t ctrl, int conttype, const char *fname)
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{
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switch (conttype)
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{
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case CONTTYPE_ENCFS:
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return gpg_error (GPG_ERR_NOT_SUPPORTED);
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case CONTTYPE_DM_CRYPT:
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return be_dmcrypt_suspend_container (ctrl, fname);
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default:
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return no_such_backend (conttype);
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}
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}
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/* Dispatcher to the backend's resume function. */
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gpg_error_t
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be_resume_container (ctrl_t ctrl, int conttype, const char *fname,
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tupledesc_t tuples)
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{
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switch (conttype)
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{
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case CONTTYPE_ENCFS:
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return gpg_error (GPG_ERR_NOT_SUPPORTED);
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case CONTTYPE_DM_CRYPT:
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return be_dmcrypt_resume_container (ctrl, fname, tuples);
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default:
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return no_such_backend (conttype);
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}
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}
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