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![NIIBE Yutaka](/assets/img/avatar_default.png)
* dirmngr/Makefile.am (AM_CPPFLAGS): Remove -I$(top_srcdir)/common. * g10/Makefile.am (AM_CPPFLAGS): Ditto. * g13/Makefile.am (AM_CPPFLAGS): Ditto. * kbx/Makefile.am (AM_CPPFLAGS): Ditto. * scd/Makefile.am (AM_CPPFLAGS): Ditto. * sm/Makefile.am (AM_CPPFLAGS): Ditto. * tools/Makefile.am (AM_CPPFLAGS): Ditto. * Throughout: Follow the change. Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
153 lines
3.8 KiB
C
153 lines
3.8 KiB
C
/* sh-blockdev.c - Block device functions for g13-syshelp
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* Copyright (C) 2015 Werner Koch
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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 <stdarg.h>
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#include <errno.h>
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#include <assert.h>
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#include <limits.h>
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#include "g13-syshelp.h"
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#include <assuan.h>
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#include "../common/i18n.h"
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#include "../common/exectool.h"
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#include "keyblob.h"
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#ifndef HAVE_STRTOULL
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# error building this tool requires strtoull(3)
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#endif
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#ifndef ULLONG_MAX
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# error ULLONG_MAX missing
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#endif
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/* Return the size measured in the number of 512 byte sectors for the
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block device NAME. */
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gpg_error_t
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sh_blockdev_getsz (const char *name, unsigned long long *r_nblocks)
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{
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gpg_error_t err;
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const char *argv[3];
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char *result;
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*r_nblocks = 0;
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argv[0] = "--getsz";
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argv[1] = name;
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argv[2] = NULL;
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err = gnupg_exec_tool ("/sbin/blockdev", argv, NULL, &result, NULL);
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if (!err)
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{
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gpg_err_set_errno (0);
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*r_nblocks = strtoull (result, NULL, 10);
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if (*r_nblocks == ULLONG_MAX && errno)
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{
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err = gpg_error_from_syserror ();
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*r_nblocks = 0;
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}
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xfree (result);
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}
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return err;
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}
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/* Return 0 if the device NAME looks like an empty partition. */
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gpg_error_t
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sh_is_empty_partition (const char *name)
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{
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gpg_error_t err;
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const char *argv[6];
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char *buffer;
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estream_t fp;
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char *p;
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size_t nread;
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argv[0] = "-o";
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argv[1] = "value";
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argv[2] = "-s";
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argv[3] = "UUID";
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argv[4] = name;
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argv[5] = NULL;
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err = gnupg_exec_tool ("/sbin/blkid", argv, NULL, &buffer, NULL);
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if (err)
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return gpg_error (GPG_ERR_FALSE);
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if (*buffer)
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{
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/* There seems to be an UUID - thus we have a file system. */
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xfree (buffer);
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return gpg_error (GPG_ERR_FALSE);
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}
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xfree (buffer);
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argv[0] = "-o";
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argv[1] = "value";
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argv[2] = "-s";
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argv[3] = "PARTUUID";
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argv[4] = name;
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argv[5] = NULL;
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err = gnupg_exec_tool ("/sbin/blkid", argv, NULL, &buffer, NULL);
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if (err)
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return gpg_error (GPG_ERR_FALSE);
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if (!*buffer)
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{
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/* If there is no PARTUUID we assume that name has already a
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mapped partition. */
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xfree (buffer);
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return gpg_error (GPG_ERR_FALSE);
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}
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xfree (buffer);
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/* As a safeguard we require that the first 32k of a partition are
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all zero before we assume the partition is empty. */
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buffer = xtrymalloc (32 * 1024);
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if (!buffer)
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return gpg_error_from_syserror ();
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fp = es_fopen (name, "rb,samethread");
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if (!fp)
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{
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err = gpg_error_from_syserror ();
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log_error ("error opening '%s': %s\n", name, gpg_strerror (err));
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xfree (buffer);
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return gpg_error (GPG_ERR_FALSE);
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}
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if (es_read (fp, buffer, 32 * 1024, &nread))
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err = gpg_error_from_syserror ();
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else if (nread != 32 *1024)
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err = gpg_error (GPG_ERR_TOO_SHORT);
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else
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err = 0;
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es_fclose (fp);
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if (err)
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{
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log_error ("error reading the first 32 KiB from '%s': %s\n",
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name, gpg_strerror (err));
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xfree (buffer);
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return err;
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}
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for (p=buffer; nread && !*p; nread--, p++)
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;
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xfree (buffer);
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if (nread)
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return gpg_error (GPG_ERR_FALSE); /* No all zeroes. */
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return 0;
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}
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