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fmap_csum.c
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fmap_csum.c
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/* Copyright 2010, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <errno.h>
#include <string.h>
#include <getopt.h>
#include "lib/fmap.h"
static struct option const long_options[] =
{
{"digest", required_argument, NULL, 'd'},
{"list", no_argument, NULL, 'l'},
{"version", no_argument, NULL, 'v'},
{NULL, 0, NULL, 0}
};
void print_csum(uint8_t *digest, size_t len)
{
char *str;
char tmp[3];
unsigned int i;
int strlength = len * 2 + 1;
str = malloc(strlength);
memset(str, '\0', strlength);
for (i = 0; i < len; i++) {
snprintf(tmp, 3, "%02x", digest[i]);
strncat(str, tmp, 3);
}
printf("%s\n", str);
free(str);
}
void print_help()
{
printf("Usage: fmap_csum [OPTION]... [FILE]\n"
"Print sha1sum of static regions of FMAP-compliant binary\n"
"Arguments:\n"
"\t-h, --help\t\tprint this help menu\n"
"\t-v, --version\t\tdisplay version\n");
}
int main(int argc, char *argv[])
{
int fd, len, rc = EXIT_SUCCESS;
struct stat s;
char *filename = NULL;
uint8_t *image;
int argflag;
uint8_t *digest = NULL;
while ((argflag = getopt_long(argc, argv, "d:hlv",
long_options, NULL)) > 0) {
switch (argflag) {
case 'v':
printf("fmap suite version: %d.%d\n",
VERSION_MAJOR, VERSION_MINOR);;
goto do_exit_1;
case 'h':
print_help();
goto do_exit_1;
default:
print_help();
rc = EXIT_FAILURE;
goto do_exit_1;
}
}
/* quit if filename not specified */
if (argv[optind]) {
filename = argv[optind];
} else {
print_help();
rc = EXIT_FAILURE;
goto do_exit_1;
}
fd = open(filename, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "unable to open file \"%s\": %s\n",
filename, strerror(errno));
rc = EXIT_FAILURE;
goto do_exit_1;
}
if (fstat(fd, &s) < 0) {
fprintf(stderr, "unable to stat file \"%s\": %s\n",
filename, strerror(errno));
rc = EXIT_FAILURE;
goto do_exit_2;
}
image = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (image == MAP_FAILED) {
fprintf(stderr, "unable to map file \"%s\": %s\n",
filename, strerror(errno));
rc = EXIT_FAILURE;
goto do_exit_2;
}
if ((len = fmap_get_csum(image, s.st_size, &digest)) < 0) {
fprintf(stderr, "unable to obtain checksum\n");
rc = EXIT_FAILURE;
goto do_exit_3;
}
print_csum(digest, len);
do_exit_3:
munmap(image, s.st_size);
free(digest);
do_exit_2:
close(fd);
do_exit_1:
exit(rc);
}