483 lines
10 KiB
C
483 lines
10 KiB
C
/*
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* wipefs - utility to wipe filesystems from device
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*
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* Copyright (C) 2009 Red Hat, Inc. All rights reserved.
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* Written by Karel Zak <kzak@redhat.com>
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it would 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <string.h>
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#include <limits.h>
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#include <blkid.h>
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#include "nls.h"
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#include "xalloc.h"
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#include "strutils.h"
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#include "all-io.h"
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#include "match.h"
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#include "c.h"
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#include "closestream.h"
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#include "optutils.h"
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struct wipe_desc {
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loff_t offset; /* magic string offset */
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size_t len; /* length of magic string */
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unsigned char *magic; /* magic string */
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int zap; /* zap this offset? */
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char *usage; /* raid, filesystem, ... */
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char *type; /* FS type */
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char *label; /* FS label */
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char *uuid; /* FS uuid */
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int on_disk;
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struct wipe_desc *next;
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};
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enum {
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WP_MODE_PRETTY, /* default */
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WP_MODE_PARSABLE
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};
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static const char *type_pattern;
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static void
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print_pretty(struct wipe_desc *wp, int line)
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{
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if (!line) {
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printf("offset type\n");
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printf("----------------------------------------------------------------\n");
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}
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printf("0x%-17jx %s [%s]", wp->offset, wp->type, wp->usage);
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if (wp->label && *wp->label)
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printf("\n%27s %s", "LABEL:", wp->label);
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if (wp->uuid)
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printf("\n%27s %s", "UUID: ", wp->uuid);
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puts("\n");
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}
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static void
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print_parsable(struct wipe_desc *wp, int line)
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{
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char enc[256];
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if (!line)
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printf("# offset,uuid,label,type\n");
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printf("0x%jx,", wp->offset);
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if (wp->uuid) {
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blkid_encode_string(wp->uuid, enc, sizeof(enc));
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printf("%s,", enc);
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} else
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fputc(',', stdout);
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if (wp->label) {
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blkid_encode_string(wp->label, enc, sizeof(enc));
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printf("%s,", enc);
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} else
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fputc(',', stdout);
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blkid_encode_string(wp->type, enc, sizeof(enc));
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printf("%s\n", enc);
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}
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static void
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print_all(struct wipe_desc *wp, int mode)
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{
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int n = 0;
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while (wp) {
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switch (mode) {
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case WP_MODE_PRETTY:
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print_pretty(wp, n++);
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break;
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case WP_MODE_PARSABLE:
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print_parsable(wp, n++);
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break;
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default:
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abort();
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}
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wp = wp->next;
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}
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}
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static struct wipe_desc *
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add_offset(struct wipe_desc *wp0, loff_t offset, int zap)
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{
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struct wipe_desc *wp = wp0;
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while (wp) {
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if (wp->offset == offset)
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return wp;
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wp = wp->next;
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}
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wp = xcalloc(1, sizeof(struct wipe_desc));
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wp->offset = offset;
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wp->next = wp0;
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wp->zap = zap;
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return wp;
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}
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static struct wipe_desc *
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clone_offset(struct wipe_desc *wp0)
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{
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struct wipe_desc *wp = NULL;
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while(wp0) {
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wp = add_offset(wp, wp0->offset, wp0->zap);
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wp0 = wp0->next;
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}
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return wp;
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}
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static struct wipe_desc *
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get_desc_for_probe(struct wipe_desc *wp, blkid_probe pr)
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{
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const char *off, *type, *mag, *p, *usage = NULL;
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size_t len;
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loff_t offset;
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int rc;
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/* superblocks */
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if (blkid_probe_lookup_value(pr, "TYPE", &type, NULL) == 0) {
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rc = blkid_probe_lookup_value(pr, "SBMAGIC_OFFSET", &off, NULL);
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if (!rc)
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rc = blkid_probe_lookup_value(pr, "SBMAGIC", &mag, &len);
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if (rc)
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return wp;
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/* partitions */
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} else if (blkid_probe_lookup_value(pr, "PTTYPE", &type, NULL) == 0) {
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rc = blkid_probe_lookup_value(pr, "PTMAGIC_OFFSET", &off, NULL);
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if (!rc)
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rc = blkid_probe_lookup_value(pr, "PTMAGIC", &mag, &len);
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if (rc)
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return wp;
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usage = "partition table";
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} else
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return wp;
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if (type_pattern && !match_fstype(type, type_pattern))
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return wp;
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offset = strtoll(off, NULL, 10);
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wp = add_offset(wp, offset, 0);
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if (!wp)
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return NULL;
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if (usage || blkid_probe_lookup_value(pr, "USAGE", &usage, NULL) == 0)
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wp->usage = xstrdup(usage);
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wp->type = xstrdup(type);
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wp->on_disk = 1;
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wp->magic = xmalloc(len);
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memcpy(wp->magic, mag, len);
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wp->len = len;
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if (blkid_probe_lookup_value(pr, "LABEL", &p, NULL) == 0)
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wp->label = xstrdup(p);
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if (blkid_probe_lookup_value(pr, "UUID", &p, NULL) == 0)
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wp->uuid = xstrdup(p);
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return wp;
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}
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static blkid_probe
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new_probe(const char *devname, int mode)
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{
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blkid_probe pr;
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if (!devname)
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return NULL;
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if (mode) {
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int fd = open(devname, mode);
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if (fd < 0)
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goto error;
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pr = blkid_new_probe();
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if (pr && blkid_probe_set_device(pr, fd, 0, 0))
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goto error;
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} else
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pr = blkid_new_probe_from_filename(devname);
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if (!pr)
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goto error;
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blkid_probe_enable_superblocks(pr, 1);
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blkid_probe_set_superblocks_flags(pr, BLKID_SUBLKS_MAGIC |
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BLKID_SUBLKS_TYPE | BLKID_SUBLKS_USAGE |
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BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID);
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blkid_probe_enable_partitions(pr, 1);
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blkid_probe_set_partitions_flags(pr, BLKID_PARTS_MAGIC);
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return pr;
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error:
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err(EXIT_FAILURE, _("error: %s: probing initialization failed"), devname);
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return NULL;
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}
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static struct wipe_desc *
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read_offsets(struct wipe_desc *wp, const char *devname)
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{
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blkid_probe pr = new_probe(devname, 0);
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if (!pr)
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return NULL;
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while (blkid_do_probe(pr) == 0) {
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wp = get_desc_for_probe(wp, pr);
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if (!wp)
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break;
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}
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blkid_free_probe(pr);
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return wp;
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}
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static void
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free_wipe(struct wipe_desc *wp)
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{
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while (wp) {
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struct wipe_desc *next = wp->next;
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free(wp->usage);
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free(wp->type);
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free(wp->magic);
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free(wp->label);
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free(wp->uuid);
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free(wp);
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wp = next;
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}
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}
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static void do_wipe_real(blkid_probe pr, const char *devname, struct wipe_desc *w, int noact, int quiet)
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{
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size_t i;
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if (blkid_do_wipe(pr, noact))
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warn(_("%s: failed to erase %s magic string at offset 0x%08jx"),
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devname, w->type, w->offset);
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if (quiet)
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return;
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printf(_("%s: %zd bytes were erased at offset 0x%08jx (%s): "),
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devname, w->len, w->offset, w->type);
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for (i = 0; i < w->len; i++) {
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printf("%02x", w->magic[i]);
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if (i + 1 < w->len)
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fputc(' ', stdout);
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}
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putchar('\n');
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}
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static struct wipe_desc *
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do_wipe(struct wipe_desc *wp, const char *devname, int noact, int all, int quiet, int force)
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{
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int flags;
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blkid_probe pr;
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struct wipe_desc *w, *wp0 = clone_offset(wp);
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int zap = all ? 1 : wp->zap;
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flags = O_RDWR;
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if (!force)
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flags |= O_EXCL;
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pr = new_probe(devname, flags);
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if (!pr)
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return NULL;
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while (blkid_do_probe(pr) == 0) {
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wp = get_desc_for_probe(wp, pr);
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if (!wp)
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break;
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/* Check if offset is in provided list */
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w = wp0;
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while(w && w->offset != wp->offset)
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w = w->next;
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if (wp0 && !w)
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continue;
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/* Mark done if found in provided list */
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if (w)
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w->on_disk = wp->on_disk;
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if (!wp->on_disk)
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continue;
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if (zap)
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do_wipe_real(pr, devname, wp, noact, quiet);
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}
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for (w = wp0; w != NULL; w = w->next) {
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if (!w->on_disk && !quiet)
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warnx(_("%s: offset 0x%jx not found"), devname, w->offset);
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}
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fsync(blkid_probe_get_fd(pr));
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close(blkid_probe_get_fd(pr));
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blkid_free_probe(pr);
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free_wipe(wp0);
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return wp;
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}
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static void __attribute__((__noreturn__))
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usage(FILE *out)
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{
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fputs(_("\nUsage:\n"), out);
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fprintf(out,
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_(" %s [options] <device>\n"), program_invocation_short_name);
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fputs(_("\nOptions:\n"), out);
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fputs(_(" -a, --all wipe all magic strings (BE CAREFUL!)\n"
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" -f, --force force erasure\n"
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" -h, --help show this help text\n"
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" -n, --no-act do everything except the actual write() call\n"
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" -o, --offset <num> offset to erase, in bytes\n"
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" -p, --parsable print out in parsable instead of printable format\n"
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" -q, --quiet suppress output messages\n"
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" -t, --types <list> limit the set of filesystem, RAIDs or partition tables\n"
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" -V, --version output version information and exit\n"), out);
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fprintf(out, _("\nFor more information see wipefs(8).\n"));
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exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
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}
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int
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main(int argc, char **argv)
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{
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struct wipe_desc *wp0 = NULL, *wp;
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int c, all = 0, force = 0, has_offset = 0, noact = 0, quiet = 0;
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int mode = WP_MODE_PRETTY;
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static const struct option longopts[] = {
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{ "all", 0, 0, 'a' },
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{ "force", 0, 0, 'f' },
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{ "help", 0, 0, 'h' },
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{ "no-act", 0, 0, 'n' },
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{ "offset", 1, 0, 'o' },
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{ "parsable", 0, 0, 'p' },
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{ "quiet", 0, 0, 'q' },
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{ "types", 1, 0, 't' },
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{ "version", 0, 0, 'V' },
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{ NULL, 0, 0, 0 }
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};
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static const ul_excl_t excl[] = { /* rows and cols in in ASCII order */
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{ 'a','o' },
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{ 0 }
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};
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int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;
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setlocale(LC_ALL, "");
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bindtextdomain(PACKAGE, LOCALEDIR);
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textdomain(PACKAGE);
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atexit(close_stdout);
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while ((c = getopt_long(argc, argv, "ahno:pqt:V", longopts, NULL)) != -1) {
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err_exclusive_options(c, longopts, excl, excl_st);
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switch(c) {
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case 'a':
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all++;
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break;
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case 'f':
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force++;
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break;
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case 'h':
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usage(stdout);
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break;
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case 'n':
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noact++;
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break;
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case 'o':
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wp0 = add_offset(wp0, strtosize_or_err(optarg,
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_("invalid offset argument")), 1);
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has_offset++;
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break;
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case 'p':
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mode = WP_MODE_PARSABLE;
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break;
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case 'q':
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quiet++;
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break;
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case 't':
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type_pattern = optarg;
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break;
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case 'V':
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printf(UTIL_LINUX_VERSION);
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return EXIT_SUCCESS;
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default:
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usage(stderr);
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break;
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}
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}
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if (optind == argc)
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usage(stderr);
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if (!all && !has_offset) {
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/*
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* Print only
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*/
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while (optind < argc) {
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wp0 = read_offsets(NULL, argv[optind++]);
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if (wp0)
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print_all(wp0, mode);
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free_wipe(wp0);
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}
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} else {
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/*
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* Erase
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*/
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while (optind < argc) {
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wp = clone_offset(wp0);
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wp = do_wipe(wp, argv[optind++], noact, all, quiet,
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force);
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free_wipe(wp);
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}
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}
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return EXIT_SUCCESS;
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}
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