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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* cryptsetup file differ check (rewritten Clemens' fileDiffer in Python)
*
* Copyright (C) 2010-2024 Red Hat, Inc. All rights reserved.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <ctype.h>
#include <sys/stat.h>
#include <sys/mman.h>
struct ffile {
char *name;
int fd;
unsigned char *addr;
size_t size;
};
enum df { OK , FAIL };
static void print_diff(off_t from, int max,
const unsigned char *o,
const unsigned char *n)
{
int i, len = max;
if (len > 16)
len = 16;
printf("OLD:");
for (i = 0; i < len; i++)
printf(" %02x", o[from + i]);
printf("%s\n ", max != len ? " ..." : "");
for (i = 0; i < len; i++)
printf(" %2c", o[from + i] > ' ' ? o[from + i]: '.');
printf("\nNEW:");
for (i = 0; i < len; i++)
printf(" %02x", n[from + i]);
printf("%s\n ", max != len ? " ..." : "");
for (i = 0; i < len; i++)
printf(" %2c", n[from + i] > ' ' ? n[from + i]: '.');
printf("\n");
}
/*
* Xfrom-to (e.g. R10-15)
* A - change allowed
* S - change required, semantic
* R - change required, random
* F - change forbidden
*/
static enum df check(const char *range, unsigned char *o, unsigned char *n)
{
char strict;
unsigned long long from, to;
enum df ret;
if (sscanf(range, "%c%llu-%llu", &strict, &from, &to) != 3) {
printf("Unknown range format %s.\n", range);
return FAIL;
}
switch (toupper(strict)) {
case 'A':
ret = OK;
break;
case 'S':
ret = memcmp(&o[from], &n[from], to - from + 1) != 0 ? OK : FAIL;
break;
case 'R': /* FIXME - random test */
ret = memcmp(&o[from], &n[from], to - from + 1) != 0 ? OK : FAIL;
break;
case 'F':
ret = memcmp(&o[from], &n[from], to - from + 1) == 0 ? OK : FAIL;
break;
default:
ret = FAIL;
break;
}
if (ret == FAIL)
print_diff(from, to - from + 1, o, n);
return ret;
}
static int open_mmap(struct ffile *f)
{
struct stat st;
f->fd = open(f->name, O_RDONLY);
if (f->fd == -1 || fstat(f->fd, &st) == -1)
return 0;
f->size = st.st_size;
f->addr = mmap(NULL, f->size, PROT_READ, MAP_PRIVATE, f->fd, 0);
return (f->addr == MAP_FAILED) ? 0 : 1;
}
static void close_mmap(struct ffile *f)
{
if (f->addr != MAP_FAILED && !munmap(f->addr, f->size))
f->addr = MAP_FAILED;
if (f->fd != -1 && !close(f->fd))
f->fd = -1;
}
int main(int argc, char *argv[])
{
int i, r = 1;
struct ffile file_old = {
.fd = -1,
.addr = MAP_FAILED,
};
struct ffile file_new = {
.fd = -1,
.addr = MAP_FAILED,
};
if (argc < 3) {
printf("Use: differ old_file new_file change_list.\n");
goto bad;
}
file_old.name = argv[1];
if (!open_mmap(&file_old))
goto bad;
file_new.name = argv[2];
if (!open_mmap(&file_new))
goto bad;
for (i = 3; i < argc; i++)
if (check(argv[i], file_old.addr, file_new.addr) == FAIL) {
printf ("FAILED for %s\n", argv[i]);
r = 1;
goto bad;
}
r = 0;
bad:
close_mmap(&file_new);
close_mmap(&file_old);
return r;
}
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