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/* SPDX-License-Identifier: GPL-3.0-or-later */
#include "unsquashfs.h"
static struct option long_opts[] = {
{ "list", required_argument, NULL, 'l' },
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, 'V' },
};
static const char *short_opts = "l:hV";
static const char *help_string =
"Usage: %s [OPTIONS] <squashfs-file>\n"
"\n"
"View or extract the contents of a squashfs image.\n"
"\n"
"Possible options:\n"
" --list, -l <path> Produce a directory listing for a given path in the\n"
" squashfs image.\n"
" --help, -h Print help text and exit.\n"
" --version, -V Print version information and exit.\n"
"\n";
extern const char *__progname;
static tree_node_t *find_node(tree_node_t *n, const char *path)
{
const char *end;
size_t len;
while (path != NULL && *path != '\0') {
if (!S_ISDIR(n->mode)) {
errno = ENOTDIR;
return NULL;
}
end = strchrnul(path, '/');
len = end - path;
for (n = n->data.dir->children; n != NULL; n = n->next) {
if (strncmp(path, n->name, len) != 0)
continue;
if (n->name[len] != '\0')
continue;
break;
}
if (n == NULL) {
errno = ENOENT;
return NULL;
}
path = *end ? (end + 1) : end;
}
return n;
}
int main(int argc, char **argv)
{
int i, fd, status = EXIT_FAILURE;
char *lspath = NULL;
sqfs_super_t super;
compressor_t *cmp;
fstree_t fs;
for (;;) {
i = getopt_long(argc, argv, short_opts, long_opts, NULL);
if (i == -1)
break;
switch (i) {
case 'l':
if (optarg != NULL) {
free(lspath);
lspath = strdup(optarg ? optarg : "");
if (lspath == NULL) {
perror("processing arguments");
return EXIT_FAILURE;
}
if (canonicalize_name(lspath)) {
fprintf(stderr, "Invalid pth: %s\n",
optarg);
goto out_cmd;
}
}
break;
case 'h':
printf(help_string, __progname);
status = EXIT_SUCCESS;
goto out_cmd;
case 'V':
print_version();
status = EXIT_SUCCESS;
goto out_cmd;
default:
goto fail_arg;
}
}
if (optind >= argc) {
fprintf(stderr, "Usage: %s [OPTIONS] <filename>\n",
__progname);
goto out_cmd;
}
fd = open(argv[optind], O_RDONLY);
if (fd < 0) {
perror(argv[optind]);
goto out_cmd;
}
if (sqfs_super_read(&super, fd))
goto out_fd;
if ((super.version_major != SQFS_VERSION_MAJOR) ||
(super.version_minor != SQFS_VERSION_MINOR)) {
fprintf(stderr,
"The image uses squashfs version %d.%d\n"
"We currently only supports version %d.%d (sorry).\n",
super.version_major, super.version_minor,
SQFS_VERSION_MAJOR, SQFS_VERSION_MINOR);
goto out_fd;
}
if (super.flags & SQFS_FLAG_COMPRESSOR_OPTIONS) {
fputs("Image has been built with compressor options.\n"
"This is not yet supported.\n",
stderr);
goto out_fd;
}
if (!compressor_exists(super.compression_id)) {
fputs("Image uses a compressor that has not been built in\n",
stderr);
goto out_fd;
}
cmp = compressor_create(super.compression_id, false, super.block_size);
if (cmp == NULL)
goto out_fd;
if (read_fstree(&fs, fd, &super, cmp))
goto out_cmp;
if (lspath != NULL) {
tree_node_t *n = find_node(fs.root, lspath);
if (n == NULL) {
perror(lspath);
goto out_fs;
}
list_files(n);
}
status = EXIT_SUCCESS;
out_fs:
fstree_cleanup(&fs);
out_cmp:
cmp->destroy(cmp);
out_fd:
close(fd);
out_cmd:
free(lspath);
return status;
fail_arg:
fprintf(stderr, "Try `%s --help' for more information.\n", __progname);
free(lspath);
return EXIT_FAILURE;
}
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