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/*
* The Sleuth Kit
*
* Copyright (c) 2006-2011 Brian Carrier, Basis Technology. All Rights reserved
*
* LICENSE
* This software is distributed under the IBM Public License.
* AUTHOR(S)
* Wietse Venema
* IBM T.J. Watson Research
* P.O. Box 704
* Yorktown Heights, NY 10598, USA
--*/
/**
* \file fs_inode.c
* Contains functions to allocate, free, and process the generic inode
* structures
*/
#include "tsk_fs_i.h"
/**
* Contains the short (1 character) name of the file type
*/
char tsk_fs_meta_type_str[TSK_FS_META_TYPE_STR_MAX][2] =
{ "-", "r", "d", "p", "c", "b", "l", "s", "h", "w", "v", "V"
};
/**
* \internal
* Allocates a generic inode / metadata structure.
*
* @param a_buf_len Number of bytes needed to store fs-specific data regarding where content is stored.
* @returns NULL on error
*/
TSK_FS_META *
tsk_fs_meta_alloc(size_t a_buf_len)
{
TSK_FS_META *fs_meta;
if ((fs_meta =
(TSK_FS_META *) tsk_malloc(sizeof(TSK_FS_META))) == NULL)
return NULL;
fs_meta->attr_state = TSK_FS_META_ATTR_EMPTY;
if (a_buf_len > 0) {
if ((fs_meta->content_ptr = tsk_malloc(a_buf_len)) == NULL) {
free(fs_meta);
return NULL;
}
fs_meta->content_len = a_buf_len;
fs_meta->reset_content = NULL;
}
// assign the id so we know the structure is still alloc
fs_meta->tag = TSK_FS_META_TAG;
return fs_meta;
}
/**
* \internal
* Resize an existing TSK_FS_META structure -- changes the number of
* block pointers.
*
* @param fs_meta Structure to resize
* @param a_buf_len Size of file system specific data that is used to store references to file content
* @return NULL on error
*/
TSK_FS_META *
tsk_fs_meta_realloc(TSK_FS_META * a_fs_meta, size_t a_buf_len)
{
if (a_fs_meta->reset_content != NULL) {
a_fs_meta->reset_content(a_fs_meta->content_ptr);
}
if (a_fs_meta->content_len != a_buf_len) {
a_fs_meta->content_len = a_buf_len;
a_fs_meta->content_ptr =
tsk_realloc((char *) a_fs_meta->content_ptr, a_buf_len);
if (a_fs_meta->content_ptr == NULL) {
return NULL;
}
}
return a_fs_meta;
}
/**
* \internal
* Free the memory allocated to the TSK_FS_META structure.
*
* @param fs_meta Structure to free
*/
void
tsk_fs_meta_close(TSK_FS_META * fs_meta)
{
TSK_FS_META_NAME_LIST *fs_name, *fs_name2;
if ((!fs_meta) || (fs_meta->tag != TSK_FS_META_TAG))
return;
// clear the tag so we know the structure isn't alloc
fs_meta->tag = 0;
if (fs_meta->content_ptr) {
if (fs_meta->reset_content) {
fs_meta->reset_content(fs_meta->content_ptr);
}
free((char *) fs_meta->content_ptr);
}
fs_meta->content_ptr = NULL;
fs_meta->content_len = 0;
if (fs_meta->attr)
tsk_fs_attrlist_free(fs_meta->attr);
fs_meta->attr = NULL;
free(fs_meta->link);
fs_meta->link = NULL;
fs_name = fs_meta->name2;
while (fs_name) {
fs_name2 = fs_name->next;
fs_name->next = NULL;
free(fs_name);
fs_name = fs_name2;
}
free(fs_meta);
}
/** \internal
* Reset the contents of a TSK_FS_META structure.
* @param a_fs_meta Structure to reset
*/
void
tsk_fs_meta_reset(TSK_FS_META * a_fs_meta)
{
void *content_ptr_tmp;
size_t content_len_tmp;
TSK_FS_ATTRLIST *attr_tmp;
TSK_FS_META_NAME_LIST *name2_tmp;
char *link_tmp;
// Clear content
if (a_fs_meta->reset_content) {
a_fs_meta->reset_content(a_fs_meta->content_ptr);
}
// backup pointers
content_ptr_tmp = a_fs_meta->content_ptr;
content_len_tmp = a_fs_meta->content_len;
attr_tmp = a_fs_meta->attr;
name2_tmp = a_fs_meta->name2;
link_tmp = a_fs_meta->link;
// clear all data
memset(a_fs_meta, 0, sizeof(TSK_FS_META));
a_fs_meta->tag = TSK_FS_META_TAG;
// restore and clear the pointers
a_fs_meta->content_ptr = content_ptr_tmp;
a_fs_meta->content_len = content_len_tmp;
a_fs_meta->attr = attr_tmp;
a_fs_meta->attr_state = TSK_FS_META_ATTR_EMPTY;
a_fs_meta->name2 = name2_tmp;
a_fs_meta->link = link_tmp;
if (a_fs_meta->link)
a_fs_meta->link[0] = '\0';
if (a_fs_meta->name2) {
name2_tmp = a_fs_meta->name2;
while (name2_tmp) {
name2_tmp->name[0] = '\0';
name2_tmp->par_inode = 0;
name2_tmp->par_seq = 0;
name2_tmp = name2_tmp->next;
}
}
}
/**
* \ingroup fslib
* Walk a range of metadata structures and call a callback for each
* structure that matches the flags supplied. For example, it can
* call the callback on only allocated or unallocated entries.
*
* @param a_fs File system to process
* @param a_start Metadata address to start walking from
* @param a_end Metadata address to walk to
* @param a_flags Flags that specify the desired metadata features
* @param a_cb Callback function to call
* @param a_ptr Pointer to pass to the callback
* @returns 1 on error and 0 on success
*/
uint8_t
tsk_fs_meta_walk(TSK_FS_INFO * a_fs, TSK_INUM_T a_start,
TSK_INUM_T a_end, TSK_FS_META_FLAG_ENUM a_flags,
TSK_FS_META_WALK_CB a_cb, void *a_ptr)
{
if ((a_fs == NULL) || (a_fs->tag != TSK_FS_INFO_TAG))
return 1;
return a_fs->inode_walk(a_fs, a_start, a_end, a_flags, a_cb, a_ptr);
}
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