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/* SPDX-License-Identifier: GPL-3.0-or-later */
#include "unsquashfs.h"
static int should_skip(int type, int flags)
{
switch (type) {
case SQFS_INODE_BDEV:
case SQFS_INODE_CDEV:
case SQFS_INODE_EXT_CDEV:
case SQFS_INODE_EXT_BDEV:
return (flags & UNPACK_NO_DEVICES);
case SQFS_INODE_SLINK:
case SQFS_INODE_EXT_SLINK:
return (flags & UNPACK_NO_SLINKS);
case SQFS_INODE_SOCKET:
case SQFS_INODE_EXT_SOCKET:
return(flags & UNPACK_NO_SOCKETS);
case SQFS_INODE_FIFO:
case SQFS_INODE_EXT_FIFO:
return (flags & UNPACK_NO_FIFO);
}
return 0;
}
static int fill_dir(meta_reader_t *ir, meta_reader_t *dr, tree_node_t *root,
sqfs_super_t *super, id_table_t *idtbl, int flags)
{
sqfs_inode_generic_t *inode;
sqfs_dir_header_t hdr;
sqfs_dir_entry_t *ent;
tree_node_t *n, *prev;
uint64_t block_start;
size_t size, diff;
uint32_t i;
block_start = root->data.dir->start_block;
block_start += super->directory_table_start;
if (meta_reader_seek(dr, block_start, root->data.dir->block_offset))
return -1;
size = root->data.dir->size;
while (size != 0) {
if (meta_reader_read_dir_header(dr, &hdr))
return -1;
size -= sizeof(hdr) > size ? size : sizeof(hdr);
for (i = 0; i <= hdr.count; ++i) {
ent = meta_reader_read_dir_ent(dr);
if (ent == NULL)
return -1;
diff = sizeof(*ent) + strlen((char *)ent->name);
size -= diff > size ? size : diff;
if (should_skip(ent->type, flags)) {
free(ent);
continue;
}
inode = meta_reader_read_inode(ir, super,
hdr.start_block,
ent->offset);
if (inode == NULL) {
free(ent);
return -1;
}
n = tree_node_from_inode(inode, idtbl,
(char *)ent->name,
super->block_size);
free(ent);
free(inode);
if (n == NULL)
return -1;
n->parent = root;
n->next = root->data.dir->children;
root->data.dir->children = n;
}
}
n = root->data.dir->children;
prev = NULL;
while (n != NULL) {
if (S_ISDIR(n->mode)) {
if (fill_dir(ir, dr, n, super, idtbl, flags))
return -1;
if (n->data.dir->children == NULL &&
(flags & UNPACK_NO_EMPTY)) {
if (prev == NULL) {
root->data.dir->children = n->next;
free(n);
n = root->data.dir->children;
} else {
prev->next = n->next;
free(n);
n = prev->next;
}
continue;
}
}
prev = n;
n = n->next;
}
return 0;
}
int read_fstree(fstree_t *out, int fd, sqfs_super_t *super, compressor_t *cmp,
int flags)
{
sqfs_inode_generic_t *root;
meta_reader_t *ir, *dr;
uint64_t block_start;
id_table_t idtbl;
int status = -1;
size_t offset;
ir = meta_reader_create(fd, cmp);
if (ir == NULL)
return -1;
dr = meta_reader_create(fd, cmp);
if (dr == NULL)
goto out_ir;
if (id_table_init(&idtbl))
goto out_dr;
if (id_table_read(&idtbl, fd, super, cmp))
goto out_id;
block_start = super->root_inode_ref >> 16;
offset = super->root_inode_ref & 0xFFFF;
root = meta_reader_read_inode(ir, super, block_start, offset);
if (root == NULL)
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->default_uid = 0;
out->default_gid = 0;
out->default_mode = 0755;
out->default_mtime = super->modification_time;
out->root = tree_node_from_inode(root, &idtbl, "", super->block_size);
free(root);
root = NULL;
if (out->root == NULL)
goto out_id;
if (fill_dir(ir, dr, out->root, super, &idtbl, flags))
goto fail_fs;
fstree_sort(out);
status = 0;
out_id:
id_table_cleanup(&idtbl);
out_dr:
meta_reader_destroy(dr);
out_ir:
meta_reader_destroy(ir);
return status;
fail_fs:
fstree_cleanup(out);
goto out_id;
}
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