+/*
+ * utils - miscellaneous device utilities for cryptsetup
+ *
+ * Copyright (C) 2004, Jana Saout <jana@saout.de>
+ * Copyright (C) 2004-2007, Clemens Fruhwirth <clemens@endorphin.org>
+ * Copyright (C) 2009-2012, Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2009-2012, Milan Broz
+ *
+ * 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 <stdio.h>
#include <string.h>
#include <stdlib.h>
-#include <stddef.h>
-#include <stdarg.h>
#include <errno.h>
-#include <linux/fs.h>
-#include <sys/types.h>
-#include <unistd.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/ioctl.h>
-#include <fcntl.h>
#include <sys/mman.h>
#include <sys/resource.h>
-#include "libcryptsetup.h"
#include "internal.h"
-static char *error=NULL;
-
-void set_error_va(const char *fmt, va_list va)
-{
- int r;
-
- if(error) {
- free(error);
- error = NULL;
- }
-
- if(!fmt) return;
-
- r = vasprintf(&error, fmt, va);
- if (r < 0) {
- free(error);
- error = NULL;
- return;
- }
-
- if (r && error[r - 1] == '\n')
- error[r - 1] = '\0';
-}
-
-void set_error(const char *fmt, ...)
-{
- va_list va;
-
- va_start(va, fmt);
- set_error_va(fmt, va);
- va_end(va);
-}
-
-const char *get_error(void)
+unsigned crypt_getpagesize(void)
{
- return error;
+ long r = sysconf(_SC_PAGESIZE);
+ return r < 0 ? DEFAULT_MEM_ALIGNMENT : r;
}
static int get_alignment(int fd)
return ptr;
#endif
}
-static int sector_size(int fd)
-{
- int bsize;
- if (ioctl(fd,BLKSSZGET, &bsize) < 0)
- return -EINVAL;
- else
- return bsize;
-}
-int sector_size_for_device(const char *device)
-{
- int fd = open(device, O_RDONLY);
- int r;
- if(fd < 0)
- return -EINVAL;
- r = sector_size(fd);
- close(fd);
- return r;
-}
-
-ssize_t write_blockwise(int fd, const void *orig_buf, size_t count)
+ssize_t write_blockwise(int fd, int bsize, void *orig_buf, size_t count)
{
void *hangover_buf, *hangover_buf_base = NULL;
void *buf, *buf_base = NULL;
- int r, hangover, solid, bsize, alignment;
+ int r, hangover, solid, alignment;
ssize_t ret = -1;
- if ((bsize = sector_size(fd)) < 0)
- return bsize;
+ if (fd == -1 || !orig_buf || bsize <= 0)
+ return -1;
hangover = count % bsize;
solid = count - hangover;
goto out;
memcpy(buf, orig_buf, count);
} else
- buf = (void *)orig_buf;
+ buf = orig_buf;
r = write(fd, buf, solid);
if (r < 0 || r != solid)
goto out;
r = read(fd, hangover_buf, bsize);
- if(r < 0 || r != bsize) goto out;
+ if (r < 0 || r < hangover)
+ goto out;
+
+ if (r < bsize)
+ bsize = r;
r = lseek(fd, -bsize, SEEK_CUR);
if (r < 0)
goto out;
- memcpy(hangover_buf, buf + solid, hangover);
+ memcpy(hangover_buf, (char*)buf + solid, hangover);
r = write(fd, hangover_buf, bsize);
- if(r < 0 || r != bsize) goto out;
- free(hangover_buf_base);
+ if (r < 0 || r < hangover)
+ goto out;
}
ret = count;
- out:
+out:
+ free(hangover_buf_base);
if (buf != orig_buf)
free(buf_base);
return ret;
}
-ssize_t read_blockwise(int fd, void *orig_buf, size_t count) {
- void *hangover_buf, *hangover_buf_base;
+ssize_t read_blockwise(int fd, int bsize, void *orig_buf, size_t count) {
+ void *hangover_buf, *hangover_buf_base = NULL;
void *buf, *buf_base = NULL;
- int r, hangover, solid, bsize, alignment;
+ int r, hangover, solid, alignment;
ssize_t ret = -1;
- if ((bsize = sector_size(fd)) < 0)
- return bsize;
+ if (fd == -1 || !orig_buf || bsize <= 0)
+ return -1;
hangover = count % bsize;
solid = count - hangover;
if ((long)orig_buf & (alignment - 1)) {
buf = aligned_malloc(&buf_base, count, alignment);
if (!buf)
- goto out;
+ return -1;
} else
buf = orig_buf;
if (!hangover_buf)
goto out;
r = read(fd, hangover_buf, bsize);
- if (r < 0 || r != bsize)
+ if (r < 0 || r < hangover)
goto out;
- memcpy(buf + solid, hangover_buf, hangover);
- free(hangover_buf_base);
+ memcpy((char *)buf + solid, hangover_buf, hangover);
}
ret = count;
- out:
+out:
+ free(hangover_buf_base);
if (buf != orig_buf) {
memcpy(orig_buf, buf, count);
free(buf_base);
return ret;
}
-/*
+/*
* Combines llseek with blockwise write. write_blockwise can already deal with short writes
* but we also need a function to deal with short writes at the start. But this information
- * is implicitly included in the read/write offset, which can not be set to non-aligned
+ * is implicitly included in the read/write offset, which can not be set to non-aligned
* boundaries. Hence, we combine llseek with write.
*/
+ssize_t write_lseek_blockwise(int fd, int bsize, char *buf, size_t count, off_t offset) {
+ char *frontPadBuf;
+ void *frontPadBuf_base = NULL;
+ int r, frontHang;
+ size_t innerCount = 0;
+ ssize_t ret = -1;
-ssize_t write_lseek_blockwise(int fd, const char *buf, size_t count, off_t offset) {
- int bsize = sector_size(fd);
- const char *orig_buf = buf;
- char frontPadBuf[bsize];
- int frontHang = offset % bsize;
- int r;
- int innerCount = count < bsize ? count : bsize;
-
- if (bsize < 0)
- return bsize;
-
- lseek(fd, offset - frontHang, SEEK_SET);
- if(offset % bsize) {
- r = read(fd,frontPadBuf,bsize);
- if(r < 0) return -1;
-
- memcpy(frontPadBuf+frontHang, buf, innerCount);
-
- lseek(fd, offset - frontHang, SEEK_SET);
- r = write(fd,frontPadBuf,bsize);
- if(r < 0) return -1;
-
- buf += innerCount;
- count -= innerCount;
- }
- if(count <= 0) return buf - orig_buf;
-
- return write_blockwise(fd, buf, count) + innerCount;
-}
-
-int device_ready(struct crypt_device *cd, const char *device, int mode)
-{
- int devfd, r = 1;
- ssize_t s;
- struct stat st;
- char buf[512];
-
- if(stat(device, &st) < 0) {
- log_err(cd, _("Device %s doesn't exist or access denied.\n"), device);
- return 0;
- }
+ if (fd == -1 || !buf || bsize <= 0)
+ return -1;
- log_dbg("Trying to open and read device %s.", device);
- devfd = open(device, mode | O_DIRECT | O_SYNC);
- if(devfd < 0) {
- log_err(cd, _("Cannot open device %s for %s%s access.\n"), device,
- (mode & O_EXCL) ? _("exclusive ") : "",
- (mode & O_RDWR) ? _("writable") : _("read-only"));
- return 0;
- }
+ frontHang = offset % bsize;
- /* Try to read first sector */
- s = read_blockwise(devfd, buf, sizeof(buf));
- if (s < 0 || s != sizeof(buf)) {
- log_err(cd, _("Cannot read device %s.\n"), device);
- r = 0;
- }
-
- memset(buf, 0, sizeof(buf));
- close(devfd);
+ if (lseek(fd, offset - frontHang, SEEK_SET) < 0)
+ goto out;
- return r;
-}
+ if (frontHang) {
+ frontPadBuf = aligned_malloc(&frontPadBuf_base,
+ bsize, get_alignment(fd));
+ if (!frontPadBuf)
+ goto out;
-int get_device_infos(const char *device,
- int open_exclusive,
- int *readonly,
- uint64_t *size)
-{
- struct stat st;
- unsigned long size_small;
- int fd, r = -1;
- int flags = 0;
-
- *readonly = 0;
- *size = 0;
-
- if (stat(device, &st) < 0)
- return -EINVAL;
-
- /* never wipe header on mounted device */
- if (open_exclusive && S_ISBLK(st.st_mode))
- flags |= O_EXCL;
-
- /* Try to open read-write to check whether it is a read-only device */
- fd = open(device, O_RDWR | flags);
- if (fd == -1 && errno == EROFS) {
- *readonly = 1;
- fd = open(device, O_RDONLY | flags);
- }
+ r = read(fd, frontPadBuf, bsize);
+ if (r < 0 || r != bsize)
+ goto out;
- if (fd == -1 && open_exclusive && errno == EBUSY)
- return -EBUSY;
+ innerCount = bsize - frontHang;
+ if (innerCount > count)
+ innerCount = count;
- if (fd == -1)
- return -EINVAL;
+ memcpy(frontPadBuf + frontHang, buf, innerCount);
-#ifdef BLKROGET
- /* If the device can be opened read-write, i.e. readonly is still 0, then
- * check whether BKROGET says that it is read-only. E.g. read-only loop
- * devices may be openend read-write but are read-only according to BLKROGET
- */
- if (*readonly == 0 && (r = ioctl(fd, BLKROGET, readonly)) < 0)
- goto out;
-#else
-#error BLKROGET not available
-#endif
+ if (lseek(fd, offset - frontHang, SEEK_SET) < 0)
+ goto out;
-#ifdef BLKGETSIZE64
- if (ioctl(fd, BLKGETSIZE64, size) >= 0) {
- *size >>= SECTOR_SHIFT;
- r = 0;
- goto out;
- }
-#endif
+ r = write(fd, frontPadBuf, bsize);
+ if (r < 0 || r != bsize)
+ goto out;
-#ifdef BLKGETSIZE
- if (ioctl(fd, BLKGETSIZE, &size_small) >= 0) {
- *size = (uint64_t)size_small;
- r = 0;
- goto out;
+ buf += innerCount;
+ count -= innerCount;
}
-#else
-# error Need at least the BLKGETSIZE ioctl!
-#endif
- r = -EINVAL;
+ ret = count ? write_blockwise(fd, bsize, buf, count) : 0;
+ if (ret >= 0)
+ ret += innerCount;
out:
- close(fd);
- return r;
-}
+ free(frontPadBuf_base);
-int wipe_device_header(const char *device, int sectors)
-{
- struct stat st;
- char *buffer;
- int size = sectors * SECTOR_SIZE;
- int r = -1;
- int devfd;
- int flags = O_RDWR | O_DIRECT | O_SYNC;
-
- if (stat(device, &st) < 0)
- return -EINVAL;
-
- /* never wipe header on mounted device */
- if (S_ISBLK(st.st_mode))
- flags |= O_EXCL;
-
- devfd = open(device, flags);
- if(devfd == -1)
- return errno == EBUSY ? -EBUSY : -EINVAL;
-
- buffer = malloc(size);
- if (!buffer) {
- close(devfd);
- return -ENOMEM;
- }
- memset(buffer, 0, size);
-
- r = write_blockwise(devfd, buffer, size) < size ? -EIO : 0;
-
- free(buffer);
- close(devfd);
-
- return r;
+ return ret;
}
/* MEMLOCK */
{
if (!_memlock_count++) {
log_dbg("Locking memory.");
- if (mlockall(MCL_CURRENT | MCL_FUTURE)) {
- log_err(ctx, _("WARNING!!! Possibly insecure memory. Are you root?\n"));
+ if (mlockall(MCL_CURRENT | MCL_FUTURE) == -1) {
+ log_dbg("Cannot lock memory with mlockall.");
_memlock_count--;
return 0;
}
log_err(ctx, _("Cannot get process priority.\n"));
else
if (setpriority(PRIO_PROCESS, 0, DEFAULT_PROCESS_PRIORITY))
- log_err(ctx, _("setpriority %u failed: %s"),
+ log_dbg("setpriority %d failed: %s",
DEFAULT_PROCESS_PRIORITY, strerror(errno));
}
return _memlock_count ? 1 : 0;
{
if (_memlock_count && (!--_memlock_count)) {
log_dbg("Unlocking memory.");
- if (munlockall())
- log_err(ctx, _("Cannot unlock memory."));
+ if (munlockall() == -1)
+ log_err(ctx, _("Cannot unlock memory.\n"));
if (setpriority(PRIO_PROCESS, 0, _priority))
- log_err(ctx, _("setpriority %u failed: %s"), _priority, strerror(errno));
+ log_dbg("setpriority %d failed: %s", _priority, strerror(errno));
}
return _memlock_count ? 1 : 0;
}
-
-/* DEVICE TOPOLOGY */
-
-/* block device topology ioctls, introduced in 2.6.32 */
-#ifndef BLKIOMIN
-#define BLKIOMIN _IO(0x12,120)
-#define BLKIOOPT _IO(0x12,121)
-#define BLKALIGNOFF _IO(0x12,122)
-#endif
-
-void get_topology_alignment(const char *device,
- unsigned long *required_alignment, /* bytes */
- unsigned long *alignment_offset, /* bytes */
- unsigned long default_alignment)
-{
- int dev_alignment_offset = 0;
- unsigned int min_io_size = 0, opt_io_size = 0;
- unsigned long temp_alignment = 0;
- int fd;
-
- *required_alignment = default_alignment;
- *alignment_offset = 0;
-
- fd = open(device, O_RDONLY);
- if (fd == -1)
- return;
-
- /* minimum io size */
- if (ioctl(fd, BLKIOMIN, &min_io_size) == -1) {
- log_dbg("Topology info for %s not supported, using default offset %lu bytes.",
- device, default_alignment);
- goto out;
- }
-
- /* optimal io size */
- if (ioctl(fd, BLKIOOPT, &opt_io_size) == -1)
- opt_io_size = min_io_size;
-
- /* alignment offset, bogus -1 means misaligned/unknown */
- if (ioctl(fd, BLKALIGNOFF, &dev_alignment_offset) == -1 || dev_alignment_offset < 0)
- dev_alignment_offset = 0;
- *alignment_offset = (unsigned long)dev_alignment_offset;
-
- temp_alignment = (unsigned long)min_io_size;
-
- if (temp_alignment < (unsigned long)opt_io_size)
- temp_alignment = (unsigned long)opt_io_size;
-
- /* If calculated alignment is multiple of default, keep default */
- if (temp_alignment && (default_alignment % temp_alignment))
- *required_alignment = temp_alignment;
-
- log_dbg("Topology: IO (%u/%u), offset = %lu; Required alignment is %lu bytes.",
- min_io_size, opt_io_size, *alignment_offset, *required_alignment);
-out:
- (void)close(fd);
-}
projects / platform / upstream / cryptsetup.git / blobdiff