Use strlcpy to guarantee NUL termination. Due to this, there is no need for strncmp; simply use strcmp. Reported by: Coverity CID: 1412242 MFC after: 2 weeks Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D23159
199 lines
4.7 KiB
C
199 lines
4.7 KiB
C
/*-
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* Copyright (c) 2016 The DragonFly Project
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* All rights reserved.
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*
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* This software was developed by Edward Tomasz Napierala under sponsorship
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* from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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 <err.h>
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#include <assert.h>
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#include <sys/types.h>
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#include "hammer_disk.h"
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#include "fstyp.h"
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static hammer_volume_ondisk_t
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__read_ondisk(FILE *fp)
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{
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hammer_volume_ondisk_t ondisk;
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ondisk = read_buf(fp, 0, sizeof(*ondisk));
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if (ondisk == NULL)
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err(1, "failed to read ondisk");
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return (ondisk);
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}
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static int
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__test_ondisk(const hammer_volume_ondisk_t ondisk)
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{
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static int count = 0;
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static hammer_uuid_t fsid, fstype;
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static char label[64];
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if (ondisk->vol_signature != HAMMER_FSBUF_VOLUME &&
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ondisk->vol_signature != HAMMER_FSBUF_VOLUME_REV)
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return (1);
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if (ondisk->vol_rootvol != HAMMER_ROOT_VOLNO)
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return (2);
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if (ondisk->vol_no < 0 || ondisk->vol_no > HAMMER_MAX_VOLUMES - 1)
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return (3);
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if (ondisk->vol_count < 1 || ondisk->vol_count > HAMMER_MAX_VOLUMES)
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return (4);
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if (count == 0) {
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count = ondisk->vol_count;
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assert(count != 0);
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memcpy(&fsid, &ondisk->vol_fsid, sizeof(fsid));
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memcpy(&fstype, &ondisk->vol_fstype, sizeof(fstype));
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strlcpy(label, ondisk->vol_label, sizeof(label));
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} else {
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if (ondisk->vol_count != count)
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return (5);
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if (memcmp(&ondisk->vol_fsid, &fsid, sizeof(fsid)))
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return (6);
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if (memcmp(&ondisk->vol_fstype, &fstype, sizeof(fstype)))
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return (7);
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if (strcmp(ondisk->vol_label, label))
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return (8);
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}
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return (0);
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}
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int
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fstyp_hammer(FILE *fp, char *label, size_t size)
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{
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hammer_volume_ondisk_t ondisk;
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int error = 1;
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ondisk = __read_ondisk(fp);
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if (ondisk->vol_no != HAMMER_ROOT_VOLNO)
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goto done;
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if (ondisk->vol_count != 1)
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goto done;
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if (__test_ondisk(ondisk))
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goto done;
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strlcpy(label, ondisk->vol_label, size);
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error = 0;
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done:
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free(ondisk);
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return (error);
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}
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static int
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__test_volume(const char *volpath)
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{
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hammer_volume_ondisk_t ondisk;
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FILE *fp;
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int volno = -1;
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if ((fp = fopen(volpath, "r")) == NULL)
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err(1, "failed to open %s", volpath);
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ondisk = __read_ondisk(fp);
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fclose(fp);
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if (__test_ondisk(ondisk))
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goto done;
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volno = ondisk->vol_no;
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done:
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free(ondisk);
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return (volno);
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}
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static int
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__fsvtyp_hammer(const char *blkdevs, char *label, size_t size, int partial)
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{
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hammer_volume_ondisk_t ondisk;
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FILE *fp;
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char *dup, *p, *volpath, x[HAMMER_MAX_VOLUMES];
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int i, volno, error = 1;
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memset(x, 0, sizeof(x));
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dup = strdup(blkdevs);
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p = dup;
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while (p) {
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volpath = p;
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if ((p = strchr(p, ':')) != NULL)
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*p++ = '\0';
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if ((volno = __test_volume(volpath)) == -1)
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break;
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x[volno]++;
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}
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if ((fp = fopen(volpath, "r")) == NULL)
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err(1, "failed to open %s", volpath);
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ondisk = __read_ondisk(fp);
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fclose(fp);
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free(dup);
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if (volno == -1)
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goto done;
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if (partial)
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goto success;
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for (i = 0; i < HAMMER_MAX_VOLUMES; i++)
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if (x[i] > 1)
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goto done;
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for (i = 0; i < HAMMER_MAX_VOLUMES; i++)
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if (x[i] == 0)
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break;
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if (ondisk->vol_count != i)
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goto done;
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for (; i < HAMMER_MAX_VOLUMES; i++)
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if (x[i] != 0)
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goto done;
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success:
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strlcpy(label, ondisk->vol_label, size);
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error = 0;
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done:
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free(ondisk);
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return (error);
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}
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int
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fsvtyp_hammer(const char *blkdevs, char *label, size_t size)
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{
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return (__fsvtyp_hammer(blkdevs, label, size, 0));
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}
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int
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fsvtyp_hammer_partial(const char *blkdevs, char *label, size_t size)
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{
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return (__fsvtyp_hammer(blkdevs, label, size, 1));
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}
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