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/*
** The Sleuth Kit
**
** Copyright (c) 2022 Basis Technology Corp. All rights reserved
** Contact: Brian Carrier [carrier <at> sleuthkit [dot] org]
**
** This software is distributed under the Common Public License 1.0
**
*/
/**
* Internal code to open and read logical directories
*/
#include "tsk_img_i.h"
#include "logical_img.h"
#include "tsk/util/file_system_utils.h"
/**
* \internal
* Display information about the disk image set.
*
* @param img_info Disk image to analyze
* @param hFile Handle to print information to
*/
static void
logical_imgstat(TSK_IMG_INFO * img_info, FILE * hFile)
{
IMG_LOGICAL_INFO *dir_info = (IMG_LOGICAL_INFO *) img_info;
tsk_fprintf(hFile, "IMAGE FILE INFORMATION\n");
tsk_fprintf(hFile, "--------------------------------------------\n");
tsk_fprintf(hFile, "Image Type: logical directory\n");
tsk_fprintf(hFile,
"Base Directory Path: %" PRIttocTSK "\n",
dir_info->base_path);
return;
}
/*
* Clear a cache entry. Assumes we acquired the cache_lock already or are in the process
* of closing the image and don't need it.
*/
void
clear_inum_cache_entry(IMG_LOGICAL_INFO *logical_img_info, int index) {
logical_img_info->inum_cache[index].inum = LOGICAL_INVALID_INUM;
if (logical_img_info->inum_cache[index].path != NULL) {
free(logical_img_info->inum_cache[index].path);
logical_img_info->inum_cache[index].path = NULL;
}
logical_img_info->inum_cache[index].cache_age = 0;
}
/**
* \internal
*
*
* @param img_info logical directory to close
*/
static void
logical_close(TSK_IMG_INFO * img_info)
{
IMG_LOGICAL_INFO *logical_img_info = (IMG_LOGICAL_INFO *)img_info;
free(logical_img_info->base_path);
for (int i = 0; i < LOGICAL_FILE_HANDLE_CACHE_LEN; i++) {
#ifdef TSK_WIN32
if (logical_img_info->file_handle_cache[i].fd != 0) {
CloseHandle(logical_img_info->file_handle_cache[i].fd);
}
#endif
}
for (int i = 0; i < LOGICAL_INUM_CACHE_LEN; i++) {
clear_inum_cache_entry(logical_img_info, i);
}
tsk_img_free(img_info);
}
static ssize_t
logical_read(TSK_IMG_INFO * img_info, TSK_OFF_T offset, char *buf, size_t len)
{
tsk_error_reset();
tsk_error_set_errno(TSK_ERR_IMG_READ);
tsk_error_set_errstr("logical_read: Logical image read is not supported");
return 0;
}
/**
* \internal
*
*
* @param a_num_img Number of images in set
* @param a_images List of disk image paths (in sorted order)
* @param a_ssize Size of device sector in bytes (or 0 for default)
*
* @return NULL on error
*/
TSK_IMG_INFO *
logical_open(int a_num_img, const TSK_TCHAR * const a_images[],
unsigned int a_ssize)
{
IMG_LOGICAL_INFO *logical_info;
TSK_IMG_INFO *img_info;
if (LOGICAL_IMG_DEBUG_PRINT) fprintf(stderr, "logical_open - Opening image\n");
fflush(stderr);
#ifndef TSK_WIN32
tsk_error_reset();
tsk_error_set_errno(TSK_ERR_IMG_ARG);
tsk_error_set_errstr("logical_open: Logical directories not supported for non-Windows systems");
return NULL;
#endif
if (a_num_img != 1) {
tsk_error_reset();
tsk_error_set_errno(TSK_ERR_IMG_ARG);
tsk_error_set_errstr("logical_open: Only one directory (image name) is supported for logical directories");
return NULL;
}
if ((logical_info =
(IMG_LOGICAL_INFO *)tsk_img_malloc(sizeof(IMG_LOGICAL_INFO))) == NULL)
return NULL;
img_info = (TSK_IMG_INFO *)logical_info;
logical_info->is_winobj = 0;
#ifdef TSK_WIN32
logical_info->is_winobj = is_windows_device_path(a_images[0]);
#endif
// Check that the given path exists and is a directory (return value = -3)
TSK_OFF_T size_result = get_size_of_file_on_disk(a_images[0], logical_info->is_winobj);
if (size_result != -3) {
tsk_error_reset();
tsk_error_set_errno(TSK_ERR_IMG_ARG);
tsk_error_set_errstr("logical_open: Image path is not a directory");
tsk_img_free(img_info);
return NULL;
}
img_info->size = INT64_MAX;
img_info->itype = TSK_IMG_TYPE_LOGICAL;
// Initialize file handle cache
for (int i = 0; i < LOGICAL_FILE_HANDLE_CACHE_LEN; i++) {
logical_info->file_handle_cache[i].fd = 0;
logical_info->file_handle_cache[i].inum = LOGICAL_INVALID_INUM;
}
logical_info->next_file_handle_cache_slot = 0;
// Initialize the inum cache
for (int i = 0; i < LOGICAL_INUM_CACHE_LEN; i++) {
logical_info->inum_cache[i].inum = LOGICAL_INVALID_INUM;
logical_info->inum_cache[i].path = NULL;
logical_info->inum_cache[i].cache_age = 0;
}
img_info->read = logical_read;
img_info->close = logical_close;
img_info->imgstat = logical_imgstat;
size_t len = TSTRLEN(a_images[0]);
logical_info->base_path =
(TSK_TCHAR *)tsk_malloc(sizeof(TSK_TCHAR) * (len + 1));
if (logical_info->base_path == NULL) {
tsk_img_free(img_info);
return NULL;
}
TSTRNCPY(logical_info->base_path, a_images[0], len + 1);
// Remove trailing slash
#ifdef TSK_WIN32
if ((logical_info->base_path[TSTRLEN(logical_info->base_path) - 1] == L'/')
|| (logical_info->base_path[TSTRLEN(logical_info->base_path) - 1] == L'\\')) {
logical_info->base_path[TSTRLEN(logical_info->base_path) - 1] = '\0';
}
#else
if (logical_info->base_path[TSTRLEN(logical_info->base_path) - 1] == '/') {
logical_info->base_path[TSTRLEN(logical_info->base_path) - 1] = '\0';
}
#endif
if (LOGICAL_IMG_DEBUG_PRINT) fprintf(stderr, "logical_open - Image opened successfully\n");
fflush(stderr);
return img_info;
}
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