diff options
Diffstat (limited to 'tests/differ.c')
| -rw-r--r-- | tests/differ.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/tests/differ.c b/tests/differ.c new file mode 100644 index 0000000..ec811a4 --- /dev/null +++ b/tests/differ.c @@ -0,0 +1,166 @@ +/* + * cryptsetup file differ check (rewritten Clemens' fileDiffer in Python) + * + * Copyright (C) 2010-2021 Red Hat, Inc. All rights reserved. + * + * 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 <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; +} |