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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* deserialize_fstree.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "sqfs/meta_reader.h"
#include "sqfs/dir.h"
#include "highlevel.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
static bool node_would_be_own_parent(tree_node_t *root, tree_node_t *n)
{
while (root != NULL) {
if (root->inode_num == n->inode_num)
return true;
root = root->parent;
}
return false;
}
static bool is_name_sane(const char *name)
{
if (strchr(name, '/') != NULL || strchr(name, '\\') != NULL)
goto fail;
if (strcmp(name, "..") == 0 || strcmp(name, ".") == 0)
goto fail;
return true;
fail:
fprintf(stderr, "WARNING: Found directory entry named '%s', "
"skipping\n", name);
return false;
}
static int fill_dir(sqfs_dir_reader_t *dr,
tree_node_t *root, sqfs_id_table_t *idtbl,
fstree_t *fs)
{
sqfs_inode_generic_t *inode;
sqfs_dir_entry_t *ent;
tree_node_t *n;
int err;
for (;;) {
err = sqfs_dir_reader_read(dr, &ent);
if (err > 0)
break;
if (err < 0)
return -1;
if (!is_name_sane((const char *)ent->name)) {
free(ent);
continue;
}
err = sqfs_dir_reader_get_inode(dr, &inode);
if (err) {
free(ent);
return err;
}
n = tree_node_from_inode(inode, idtbl, (char *)ent->name);
if (n == NULL) {
free(ent);
free(inode);
return -1;
}
if (node_would_be_own_parent(root, n)) {
fputs("WARNING: Found a directory that "
"contains itself, skipping loop back "
"reference!\n", stderr);
free(n);
free(ent);
free(inode);
continue;
}
free(ent);
n->inode = inode;
n->parent = root;
n->next = root->data.dir->children;
root->data.dir->children = n;
}
for (n = root->data.dir->children; n != NULL; n = n->next) {
if (S_ISDIR(n->mode)) {
err = sqfs_dir_reader_open_dir(dr, n->inode);
if (err)
return -1;
if (fill_dir(dr, n, idtbl, fs))
return -1;
}
free(n->inode);
n->inode = NULL;
}
return 0;
}
int deserialize_fstree(fstree_t *out, sqfs_super_t *super,
sqfs_compressor_t *cmp, sqfs_file_t *file)
{
sqfs_inode_generic_t *root;
sqfs_id_table_t *idtbl;
sqfs_dir_reader_t *dr;
int status = -1;
dr = sqfs_dir_reader_create(super, cmp, file);
if (dr == NULL)
return -1;
idtbl = sqfs_id_table_create();
if (idtbl == NULL)
goto out_dr;
if (sqfs_id_table_read(idtbl, file, super, cmp))
goto out_id;
if (sqfs_dir_reader_get_root_inode(dr, &root))
goto out_id;
if (root->base.type != SQFS_INODE_DIR &&
root->base.type != SQFS_INODE_EXT_DIR) {
free(root);
fputs("File system root inode is not a directory inode!\n",
stderr);
goto out_id;
}
memset(out, 0, sizeof(*out));
out->block_size = super->block_size;
out->defaults.st_uid = 0;
out->defaults.st_gid = 0;
out->defaults.st_mode = 0755;
out->defaults.st_mtime = super->modification_time;
out->root = tree_node_from_inode(root, idtbl, "");
if (out->root == NULL) {
free(root);
goto out_id;
}
if (sqfs_dir_reader_open_dir(dr, root)) {
free(root);
goto fail_fs;
}
free(root);
if (fill_dir(dr, out->root, idtbl, out))
goto fail_fs;
tree_node_sort_recursive(out->root);
status = 0;
out_id:
sqfs_id_table_destroy(idtbl);
out_dr:
sqfs_dir_reader_destroy(dr);
return status;
fail_fs:
fstree_cleanup(out);
goto out_id;
}
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