summaryrefslogtreecommitdiff
path: root/misc-utils/wipefs.c
diff options
context:
space:
mode:
Diffstat (limited to 'misc-utils/wipefs.c')
-rw-r--r--misc-utils/wipefs.c472
1 files changed, 472 insertions, 0 deletions
diff --git a/misc-utils/wipefs.c b/misc-utils/wipefs.c
new file mode 100644
index 0000000..cddad8a
--- /dev/null
+++ b/misc-utils/wipefs.c
@@ -0,0 +1,472 @@
+/*
+ * wipefs - utility to wipe filesystems from device
+ *
+ * Copyright (C) 2009 Red Hat, Inc. All rights reserved.
+ * Written by Karel Zak <kzak@redhat.com>
+ *
+ * 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 would 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 <sys/stat.h>
+#include <sys/types.h>
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <string.h>
+#include <limits.h>
+
+#include <blkid.h>
+
+#include "nls.h"
+#include "xalloc.h"
+#include "strutils.h"
+#include "all-io.h"
+#include "match.h"
+#include "c.h"
+#include "closestream.h"
+#include "optutils.h"
+
+struct wipe_desc {
+ loff_t offset; /* magic string offset */
+ size_t len; /* length of magic string */
+ unsigned char *magic; /* magic string */
+
+ int zap; /* zap this offset? */
+ char *usage; /* raid, filesystem, ... */
+ char *type; /* FS type */
+ char *label; /* FS label */
+ char *uuid; /* FS uuid */
+
+ int on_disk;
+
+ struct wipe_desc *next;
+};
+
+enum {
+ WP_MODE_PRETTY, /* default */
+ WP_MODE_PARSABLE
+};
+
+static const char *type_pattern;
+
+static void
+print_pretty(struct wipe_desc *wp, int line)
+{
+ if (!line) {
+ printf("offset type\n");
+ printf("----------------------------------------------------------------\n");
+ }
+
+ printf("0x%-17jx %s [%s]", wp->offset, wp->type, wp->usage);
+
+ if (wp->label && *wp->label)
+ printf("\n%27s %s", "LABEL:", wp->label);
+ if (wp->uuid)
+ printf("\n%27s %s", "UUID: ", wp->uuid);
+ puts("\n");
+}
+
+static void
+print_parsable(struct wipe_desc *wp, int line)
+{
+ char enc[256];
+
+ if (!line)
+ printf("# offset,uuid,label,type\n");
+
+ printf("0x%jx,", wp->offset);
+
+ if (wp->uuid) {
+ blkid_encode_string(wp->uuid, enc, sizeof(enc));
+ printf("%s,", enc);
+ } else
+ fputc(',', stdout);
+
+ if (wp->label) {
+ blkid_encode_string(wp->label, enc, sizeof(enc));
+ printf("%s,", enc);
+ } else
+ fputc(',', stdout);
+
+ blkid_encode_string(wp->type, enc, sizeof(enc));
+ printf("%s\n", enc);
+}
+
+static void
+print_all(struct wipe_desc *wp, int mode)
+{
+ int n = 0;
+
+ while (wp) {
+ switch (mode) {
+ case WP_MODE_PRETTY:
+ print_pretty(wp, n++);
+ break;
+ case WP_MODE_PARSABLE:
+ print_parsable(wp, n++);
+ break;
+ default:
+ abort();
+ }
+ wp = wp->next;
+ }
+}
+
+static struct wipe_desc *
+add_offset(struct wipe_desc *wp0, loff_t offset, int zap)
+{
+ struct wipe_desc *wp = wp0;
+
+ while (wp) {
+ if (wp->offset == offset)
+ return wp;
+ wp = wp->next;
+ }
+
+ wp = xcalloc(1, sizeof(struct wipe_desc));
+ wp->offset = offset;
+ wp->next = wp0;
+ wp->zap = zap;
+ return wp;
+}
+
+static struct wipe_desc *
+clone_offset(struct wipe_desc *wp0)
+{
+ struct wipe_desc *wp = NULL;
+
+ while(wp0) {
+ wp = add_offset(wp, wp0->offset, wp0->zap);
+ wp0 = wp0->next;
+ }
+
+ return wp;
+}
+
+static struct wipe_desc *
+get_desc_for_probe(struct wipe_desc *wp, blkid_probe pr)
+{
+ const char *off, *type, *mag, *p, *usage = NULL;
+ size_t len;
+ loff_t offset;
+ int rc;
+
+ /* superblocks */
+ if (blkid_probe_lookup_value(pr, "TYPE", &type, NULL) == 0) {
+ rc = blkid_probe_lookup_value(pr, "SBMAGIC_OFFSET", &off, NULL);
+ if (!rc)
+ rc = blkid_probe_lookup_value(pr, "SBMAGIC", &mag, &len);
+ if (rc)
+ return wp;
+
+ /* partitions */
+ } else if (blkid_probe_lookup_value(pr, "PTTYPE", &type, NULL) == 0) {
+ rc = blkid_probe_lookup_value(pr, "PTMAGIC_OFFSET", &off, NULL);
+ if (!rc)
+ rc = blkid_probe_lookup_value(pr, "PTMAGIC", &mag, &len);
+ if (rc)
+ return wp;
+ usage = "partition table";
+ } else
+ return wp;
+
+ if (type_pattern && !match_fstype(type, type_pattern))
+ return wp;
+
+ offset = strtoll(off, NULL, 10);
+
+ wp = add_offset(wp, offset, 0);
+ if (!wp)
+ return NULL;
+
+ if (usage || blkid_probe_lookup_value(pr, "USAGE", &usage, NULL) == 0)
+ wp->usage = xstrdup(usage);
+
+ wp->type = xstrdup(type);
+ wp->on_disk = 1;
+
+ wp->magic = xmalloc(len);
+ memcpy(wp->magic, mag, len);
+ wp->len = len;
+
+ if (blkid_probe_lookup_value(pr, "LABEL", &p, NULL) == 0)
+ wp->label = xstrdup(p);
+
+ if (blkid_probe_lookup_value(pr, "UUID", &p, NULL) == 0)
+ wp->uuid = xstrdup(p);
+
+ return wp;
+}
+
+static blkid_probe
+new_probe(const char *devname, int mode)
+{
+ blkid_probe pr;
+
+ if (!devname)
+ return NULL;
+
+ if (mode) {
+ int fd = open(devname, mode);
+ if (fd < 0)
+ goto error;
+
+ pr = blkid_new_probe();
+ if (pr && blkid_probe_set_device(pr, fd, 0, 0))
+ goto error;
+ } else
+ pr = blkid_new_probe_from_filename(devname);
+
+ if (!pr)
+ goto error;
+
+ blkid_probe_enable_superblocks(pr, 1);
+ blkid_probe_set_superblocks_flags(pr, BLKID_SUBLKS_MAGIC |
+ BLKID_SUBLKS_TYPE | BLKID_SUBLKS_USAGE |
+ BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID);
+
+ blkid_probe_enable_partitions(pr, 1);
+ blkid_probe_set_partitions_flags(pr, BLKID_PARTS_MAGIC);
+
+ return pr;
+error:
+ err(EXIT_FAILURE, _("error: %s: probing initialization failed"), devname);
+ return NULL;
+}
+
+static struct wipe_desc *
+read_offsets(struct wipe_desc *wp, const char *devname)
+{
+ blkid_probe pr = new_probe(devname, 0);
+
+ if (!pr)
+ return NULL;
+
+ while (blkid_do_probe(pr) == 0) {
+ wp = get_desc_for_probe(wp, pr);
+ if (!wp)
+ break;
+ }
+
+ blkid_free_probe(pr);
+ return wp;
+}
+
+static void
+free_wipe(struct wipe_desc *wp)
+{
+ while (wp) {
+ struct wipe_desc *next = wp->next;
+
+ free(wp->usage);
+ free(wp->type);
+ free(wp->magic);
+ free(wp->label);
+ free(wp->uuid);
+ free(wp);
+
+ wp = next;
+ }
+}
+
+static void do_wipe_real(blkid_probe pr, const char *devname, struct wipe_desc *w, int noact, int quiet)
+{
+ size_t i;
+
+ if (blkid_do_wipe(pr, noact))
+ warn(_("%s: failed to erase %s magic string at offset 0x%08jx"),
+ devname, w->type, w->offset);
+
+ if (quiet)
+ return;
+
+ printf(_("%s: %zd bytes were erased at offset 0x%08jx (%s): "),
+ devname, w->len, w->offset, w->type);
+
+ for (i = 0; i < w->len; i++) {
+ printf("%02x", w->magic[i]);
+ if (i + 1 < w->len)
+ fputc(' ', stdout);
+ }
+ putchar('\n');
+}
+
+static struct wipe_desc *
+do_wipe(struct wipe_desc *wp, const char *devname, int noact, int all, int quiet)
+{
+ blkid_probe pr = new_probe(devname, O_RDWR);
+ struct wipe_desc *w, *wp0 = clone_offset(wp);
+ int zap = all ? 1 : wp->zap;
+
+ if (!pr)
+ return NULL;
+
+ while (blkid_do_probe(pr) == 0) {
+ wp = get_desc_for_probe(wp, pr);
+ if (!wp)
+ break;
+
+ /* Check if offset is in provided list */
+ w = wp0;
+ while(w && w->offset != wp->offset)
+ w = w->next;
+ if (wp0 && !w)
+ continue;
+
+ /* Mark done if found in provided list */
+ if (w)
+ w->on_disk = wp->on_disk;
+
+ if (!wp->on_disk)
+ continue;
+
+ if (zap)
+ do_wipe_real(pr, devname, wp, noact, quiet);
+ }
+
+ for (w = wp0; w != NULL; w = w->next) {
+ if (!w->on_disk && !quiet)
+ warnx(_("%s: offset 0x%jx not found"), devname, w->offset);
+ }
+
+ fsync(blkid_probe_get_fd(pr));
+ close(blkid_probe_get_fd(pr));
+ blkid_free_probe(pr);
+ free_wipe(wp0);
+
+ return wp;
+}
+
+
+static void __attribute__((__noreturn__))
+usage(FILE *out)
+{
+ fputs(_("\nUsage:\n"), out);
+ fprintf(out,
+ _(" %s [options] <device>\n"), program_invocation_short_name);
+
+ fputs(_("\nOptions:\n"), out);
+ fputs(_(" -a, --all wipe all magic strings (BE CAREFUL!)\n"
+ " -h, --help show this help text\n"
+ " -n, --no-act do everything except the actual write() call\n"
+ " -o, --offset <num> offset to erase, in bytes\n"
+ " -p, --parsable print out in parsable instead of printable format\n"
+ " -q, --quiet suppress output messages\n"
+ " -t, --types <list> limit the set of filesystem, RAIDs or partition tables\n"
+ " -V, --version output version information and exit\n"), out);
+
+ fprintf(out, _("\nFor more information see wipefs(8).\n"));
+
+ exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
+}
+
+
+int
+main(int argc, char **argv)
+{
+ struct wipe_desc *wp0 = NULL, *wp;
+ int c, all = 0, has_offset = 0, noact = 0, quiet = 0;
+ int mode = WP_MODE_PRETTY;
+
+ static const struct option longopts[] = {
+ { "all", 0, 0, 'a' },
+ { "help", 0, 0, 'h' },
+ { "no-act", 0, 0, 'n' },
+ { "offset", 1, 0, 'o' },
+ { "parsable", 0, 0, 'p' },
+ { "quiet", 0, 0, 'q' },
+ { "types", 1, 0, 't' },
+ { "version", 0, 0, 'V' },
+ { NULL, 0, 0, 0 }
+ };
+
+ static const ul_excl_t excl[] = { /* rows and cols in in ASCII order */
+ { 'a','o' },
+ { 0 }
+ };
+ int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;
+
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+ atexit(close_stdout);
+
+ while ((c = getopt_long(argc, argv, "ahno:pqt:V", longopts, NULL)) != -1) {
+
+ err_exclusive_options(c, longopts, excl, excl_st);
+
+ switch(c) {
+ case 'a':
+ all++;
+ break;
+ case 'h':
+ usage(stdout);
+ break;
+ case 'n':
+ noact++;
+ break;
+ case 'o':
+ wp0 = add_offset(wp0, strtosize_or_err(optarg,
+ _("invalid offset argument")), 1);
+ has_offset++;
+ break;
+ case 'p':
+ mode = WP_MODE_PARSABLE;
+ break;
+ case 'q':
+ quiet++;
+ break;
+ case 't':
+ type_pattern = optarg;
+ break;
+ case 'V':
+ printf(_("%s from %s\n"), program_invocation_short_name,
+ PACKAGE_STRING);
+ return EXIT_SUCCESS;
+ default:
+ usage(stderr);
+ break;
+ }
+ }
+
+ if (optind == argc)
+ usage(stderr);
+
+ if (!all && !has_offset) {
+ /*
+ * Print only
+ */
+ while (optind < argc) {
+ wp0 = read_offsets(NULL, argv[optind++]);
+ if (wp0)
+ print_all(wp0, mode);
+ free_wipe(wp0);
+ }
+ } else {
+ /*
+ * Erase
+ */
+ while (optind < argc) {
+ wp = clone_offset(wp0);
+ wp = do_wipe(wp, argv[optind++], noact, all, quiet);
+ free_wipe(wp);
+ }
+ }
+
+ return EXIT_SUCCESS;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2025-02-08 22:43:37 +0000