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/*
* Author: Colin King <colin.king@canonical.com>
*
* Copyright (C) 2012 Canonical, Ltd.
*
* 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 <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <attr/xattr.h>
#define TEST_ERROR (2)
#define OFFSET (9)
#define OPT_INC (0x0001)
#define OPT_DEC (0x0002)
#define OPT_XATTR (0x0004)
void usage(char *name)
{
fprintf(stderr, "Usage: [-i | -d] [-x] file\n");
}
static int test_with_metadata_in_header(int fd, int flags)
{
unsigned char buffer[1];
if ((lseek(fd, (off_t)OFFSET, SEEK_SET)) < 0) {
fprintf(stderr, "Cannot lseek to offset %d: %s\n",
OFFSET, strerror(errno));
return TEST_ERROR;
}
if (read(fd, buffer, sizeof(buffer)) != sizeof(buffer)) {
fprintf(stderr, "Failed to read\n");
return TEST_ERROR;
}
if (flags & OPT_INC)
buffer[0]++;
if (flags & OPT_DEC)
buffer[0]--;
if ((lseek(fd, (off_t)OFFSET, SEEK_SET)) < 0) {
fprintf(stderr, "Cannot lseek to offset %d: %s\n",
OFFSET, strerror(errno));
return TEST_ERROR;
}
if (write(fd, buffer, sizeof(buffer)) != sizeof(buffer)) {
fprintf(stderr, "Failed to write\n");
return TEST_ERROR;
}
return 0;
}
static int test_with_metadata_in_xattr(int fd, int flags)
{
const char *name = "user.ecryptfs";
unsigned char *value = NULL;
ssize_t nread, size = 0;
int rc = TEST_ERROR;
size = fgetxattr(fd, name, value, size);
if (size < 0) {
fprintf(stderr, "Cannot retrieve xattr size: %s\n",
strerror(errno));
goto out;
}
value = malloc(size);
if (!value) {
fprintf(stderr,
"Cannot allocate memory to store the xattr value\n");
goto out;
}
nread = fgetxattr(fd, name, value, size);
if (nread != size) {
if (nread < 0)
fprintf(stderr, "Cannot read xattr: %s\n",
strerror(errno));
else
fprintf(stderr, "Partial xattr read: %zu < %zu\n",
nread, size);
goto out;
}
if (flags & OPT_INC)
value[OFFSET]++;
if (flags & OPT_DEC)
value[OFFSET]--;
if (fsetxattr(fd, name, value, size, XATTR_REPLACE) < 0) {
fprintf(stderr, "Cannot write xattr: %s\n", strerror(errno));
goto out;
}
rc = 0;
out:
free(value);
return rc;
}
/*
* https://bugs.launchpad.net/ecryptfs/+bug/509180
* Increment/Decrement 9th byte in lower file
*/
int main(int argc, char **argv)
{
int fd;
int opt, flags = 0;
int rc = 0;
char *file;
if (argc < 3) {
usage(argv[0]);
exit(TEST_ERROR);
}
while ((opt = getopt(argc, argv, "idx")) != -1) {
switch (opt) {
case 'i':
flags |= OPT_INC;
break;
case 'd':
flags |= OPT_DEC;
break;
case 'x':
flags |= OPT_XATTR;
break;
default:
usage(argv[0]);
exit(TEST_ERROR);
}
}
if ((flags == 0) || (flags == (OPT_INC | OPT_DEC))) {
fprintf(stderr, "Need to specify -i or -d\n");
exit(TEST_ERROR);
}
file = argv[optind];
if ((fd = open(file, O_RDWR, 0700)) < 0) {
fprintf(stderr, "Cannot open %s : %s\n", file, strerror(errno));
exit(TEST_ERROR);
}
if (flags & OPT_XATTR)
rc = test_with_metadata_in_xattr(fd, flags);
else
rc = test_with_metadata_in_header(fd, flags);
tidy:
if (close(fd) < 0) {
fprintf(stderr, "Close failed: %s\n", strerror(errno));
exit(TEST_ERROR);
}
exit(rc);
}
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