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-rw-r--r--lib/utils_blkid.c323
1 files changed, 323 insertions, 0 deletions
diff --git a/lib/utils_blkid.c b/lib/utils_blkid.c
new file mode 100644
index 0000000..562b136
--- /dev/null
+++ b/lib/utils_blkid.c
@@ -0,0 +1,323 @@
+/*
+ * blkid probe utilities
+ *
+ * Copyright (C) 2018-2021 Red Hat, Inc. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "utils_blkid.h"
+#include "utils_io.h"
+
+#ifdef HAVE_BLKID
+#include <blkid/blkid.h>
+/* make bad checksums flag optional */
+#ifndef BLKID_SUBLKS_BADCSUM
+#define BLKID_SUBLKS_BADCSUM 0
+#endif
+struct blkid_handle {
+ int fd;
+ blkid_probe pr;
+};
+#ifndef HAVE_BLKID_WIPE
+static size_t crypt_getpagesize(void)
+{
+ long r = sysconf(_SC_PAGESIZE);
+ return r <= 0 ? 4096 : (size_t)r;
+}
+#endif
+#endif
+
+void blk_set_chains_for_wipes(struct blkid_handle *h)
+{
+#ifdef HAVE_BLKID
+ blkid_probe_enable_partitions(h->pr, 1);
+ blkid_probe_set_partitions_flags(h->pr, 0
+#ifdef HAVE_BLKID_WIPE
+ | BLKID_PARTS_MAGIC
+#endif
+ );
+
+ blkid_probe_enable_superblocks(h->pr, 1);
+ blkid_probe_set_superblocks_flags(h->pr, BLKID_SUBLKS_LABEL |
+ BLKID_SUBLKS_UUID |
+ BLKID_SUBLKS_TYPE |
+ BLKID_SUBLKS_USAGE |
+ BLKID_SUBLKS_VERSION |
+ BLKID_SUBLKS_MAGIC |
+ BLKID_SUBLKS_BADCSUM);
+#endif
+}
+
+void blk_set_chains_for_full_print(struct blkid_handle *h)
+{
+ blk_set_chains_for_wipes(h);
+}
+
+void blk_set_chains_for_fast_detection(struct blkid_handle *h)
+{
+#ifdef HAVE_BLKID
+ blkid_probe_enable_partitions(h->pr, 1);
+ blkid_probe_set_partitions_flags(h->pr, 0);
+
+ blkid_probe_enable_superblocks(h->pr, 1);
+ blkid_probe_set_superblocks_flags(h->pr, BLKID_SUBLKS_TYPE);
+#endif
+}
+
+int blk_init_by_path(struct blkid_handle **h, const char *path)
+{
+ int r = -ENOTSUP;
+#ifdef HAVE_BLKID
+ struct blkid_handle *tmp = malloc(sizeof(*tmp));
+ if (!tmp)
+ return -ENOMEM;
+
+ tmp->fd = -1;
+
+ tmp->pr = blkid_new_probe_from_filename(path);
+ if (!tmp->pr) {
+ free(tmp);
+ return -EINVAL;
+ }
+
+ *h = tmp;
+
+ r = 0;
+#endif
+ return r;
+}
+
+int blk_init_by_fd(struct blkid_handle **h, int fd)
+{
+ int r = -ENOTSUP;
+#ifdef HAVE_BLKID
+ struct blkid_handle *tmp = malloc(sizeof(*tmp));
+ if (!tmp)
+ return -ENOMEM;
+
+ tmp->pr = blkid_new_probe();
+ if (!tmp->pr) {
+ free(tmp);
+ return -EINVAL;
+ }
+
+ if (blkid_probe_set_device(tmp->pr, fd, 0, 0)) {
+ blkid_free_probe(tmp->pr);
+ free(tmp);
+ return -EINVAL;
+ }
+
+ tmp->fd = fd;
+
+ *h = tmp;
+
+ r = 0;
+#endif
+ return r;
+}
+
+int blk_superblocks_filter_luks(struct blkid_handle *h)
+{
+ int r = -ENOTSUP;
+#ifdef HAVE_BLKID
+ char luks[] = "crypto_LUKS";
+ char *luks_filter[] = {
+ luks,
+ NULL
+ };
+ r = blkid_probe_filter_superblocks_type(h->pr, BLKID_FLTR_NOTIN, luks_filter);
+#endif
+ return r;
+}
+
+blk_probe_status blk_probe(struct blkid_handle *h)
+{
+ blk_probe_status pr = PRB_FAIL;
+#ifdef HAVE_BLKID
+ int r = blkid_do_probe(h->pr);
+
+ if (r == 0)
+ pr = PRB_OK;
+ else if (r == 1)
+ pr = PRB_EMPTY;
+#endif
+ return pr;
+}
+
+blk_probe_status blk_safeprobe(struct blkid_handle *h)
+{
+ int r = -1;
+#ifdef HAVE_BLKID
+ r = blkid_do_safeprobe(h->pr);
+#endif
+ switch (r) {
+ case -2:
+ return PRB_AMBIGUOUS;
+ case 1:
+ return PRB_EMPTY;
+ case 0:
+ return PRB_OK;
+ default:
+ return PRB_FAIL;
+ }
+}
+
+int blk_is_partition(struct blkid_handle *h)
+{
+ int r = 0;
+#ifdef HAVE_BLKID
+ r = blkid_probe_has_value(h->pr, "PTTYPE");
+#endif
+ return r;
+}
+
+int blk_is_superblock(struct blkid_handle *h)
+{
+ int r = 0;
+#ifdef HAVE_BLKID
+ r = blkid_probe_has_value(h->pr, "TYPE");
+#endif
+ return r;
+}
+
+const char *blk_get_partition_type(struct blkid_handle *h)
+{
+ const char *value = NULL;
+#ifdef HAVE_BLKID
+ (void) blkid_probe_lookup_value(h->pr, "PTTYPE", &value, NULL);
+#endif
+ return value;
+}
+
+const char *blk_get_superblock_type(struct blkid_handle *h)
+{
+ const char *value = NULL;
+#ifdef HAVE_BLKID
+ (void) blkid_probe_lookup_value(h->pr, "TYPE", &value, NULL);
+#endif
+ return value;
+}
+
+void blk_free(struct blkid_handle *h)
+{
+#ifdef HAVE_BLKID
+ if (!h)
+ return;
+
+ if (h->pr)
+ blkid_free_probe(h->pr);
+
+ free(h);
+#endif
+}
+
+#ifdef HAVE_BLKID
+#ifndef HAVE_BLKID_WIPE
+static int blk_step_back(struct blkid_handle *h)
+{
+#ifdef HAVE_BLKID_STEP_BACK
+ return blkid_probe_step_back(h->pr);
+#else
+ blkid_reset_probe(h->pr);
+ blkid_probe_set_device(h->pr, h->fd, 0, 0);
+ return 0;
+#endif
+}
+#endif /* not HAVE_BLKID_WIPE */
+#endif /* HAVE_BLKID */
+
+int blk_do_wipe(struct blkid_handle *h)
+{
+#ifdef HAVE_BLKID
+#ifdef HAVE_BLKID_WIPE
+ return blkid_do_wipe(h->pr, 0);
+#else
+ const char *offset;
+ off_t offset_val;
+ void *buf;
+ ssize_t ret;
+ size_t alignment, len, bsize = blkid_probe_get_sectorsize(h->pr);
+
+ if (h->fd < 0 || !bsize)
+ return -EINVAL;
+
+ if (blk_is_partition(h)) {
+ if (blkid_probe_lookup_value(h->pr, "PTMAGIC_OFFSET", &offset, NULL))
+ return -EINVAL;
+ if (blkid_probe_lookup_value(h->pr, "PTMAGIC", NULL, &len))
+ return -EINVAL;
+ } else if (blk_is_superblock(h)) {
+ if (blkid_probe_lookup_value(h->pr, "SBMAGIC_OFFSET", &offset, NULL))
+ return -EINVAL;
+ if (blkid_probe_lookup_value(h->pr, "SBMAGIC", NULL, &len))
+ return -EINVAL;
+ } else
+ return 0;
+
+ alignment = crypt_getpagesize();
+
+ if (posix_memalign(&buf, alignment, len))
+ return -EINVAL;
+ memset(buf, 0, len);
+
+ offset_val = strtoll(offset, NULL, 10);
+
+ /* TODO: missing crypt_wipe_fd() */
+ ret = write_lseek_blockwise(h->fd, bsize, alignment, buf, len, offset_val);
+ free(buf);
+ if (ret < 0)
+ return -EIO;
+
+ if ((size_t)ret == len) {
+ blk_step_back(h);
+ return 0;
+ }
+
+ return -EIO;
+#endif
+#else /* HAVE_BLKID */
+ return -ENOTSUP;
+#endif
+}
+
+int blk_supported(void)
+{
+ int r = 0;
+#ifdef HAVE_BLKID
+ r = 1;
+#endif
+ return r;
+}
+
+off_t blk_get_offset(struct blkid_handle *h)
+{
+ off_t offset_value = -1;
+#ifdef HAVE_BLKID
+ const char *offset;
+ if (blk_is_superblock(h)) {
+ if (!blkid_probe_lookup_value(h->pr, "SBMAGIC_OFFSET", &offset, NULL))
+ offset_value = strtoll(offset, NULL, 10);
+ } else if (blk_is_partition(h) && !blkid_probe_lookup_value(h->pr, "PTMAGIC_OFFSET", &offset, NULL))
+ offset_value = strtoll(offset, NULL, 10);
+#endif
+ return offset_value;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 15:48:26 +0000