ldso: added pe_open_physical_parent_directory().

1 files changed, 105 insertions, 0 deletions

diff --git a/src/ldso/pe_open_physical_parent_directory.c b/src/ldso/pe_open_physical_parent_directory.c
new file mode 100644
index 0000000..7166df5
--- /dev/null
+++ b/src/ldso/pe_open_physical_parent_directory.c
@@ -0,0 +1,105 @@
+/*****************************************************************************/
+/*  pemagination: a (virtual) tour into portable bits and executable bytes   */
+/*  Copyright (C) 2013--2017  Z. Gilboa                                      */
+/*  Released under GPLv2 and GPLv3; see COPYING.PEMAGINE.                    */
+/*****************************************************************************/
+
+#include <psxtypes/psxtypes.h>
+#include <pemagine/pemagine.h>
+#include <pemagine/pe_structs.h>
+#include "pe_os.h"
+
+int32_t pe_open_physical_parent_directory(
+	__out	void **		hparent,
+	__in	void *		href,
+	__out	uintptr_t *	buffer,
+	__in	uint32_t	buffer_size,
+	__in	uint32_t	desired_access,
+	__in	uint32_t	open_options)
+{
+	int32_t			status;
+	struct os_oa		oa;
+	struct os_iosb		iosb;
+	wchar16_t *		wch;
+	wchar16_t *		root;
+	struct pe_unicode_str *	path;
+	uint32_t		len;
+	void *			hntdll;
+	os_zw_query_object *	zw_query_object;
+	os_zw_open_file *	zw_open_file;
+
+
+	/* init */
+	path = (struct pe_unicode_str *)buffer;
+
+	if (!(hntdll = pe_get_ntdll_module_handle()))
+		return OS_STATUS_INTERNAL_ERROR;
+
+	if (!(zw_query_object = (os_zw_query_object *)pe_get_procedure_address(
+			hntdll,"ZwQueryObject")))
+		return OS_STATUS_INTERNAL_ERROR;
+
+	if (!(zw_open_file = (os_zw_open_file *)pe_get_procedure_address(
+			hntdll,"ZwOpenFile")))
+		return OS_STATUS_INTERNAL_ERROR;
+
+	/* native path of base directory */
+	if ((status = zw_query_object(
+			href,
+			OS_OBJECT_NAME_INFORMATION,
+			path,
+			buffer_size,
+			&len)))
+		return status;
+
+	/* integrity */
+	if (len == sizeof(struct pe_unicode_str))
+		return OS_STATUS_BAD_FILE_TYPE;
+
+	/* device root directory */
+	root = path->buffer;
+	wch  = path->buffer + (path->strlen / sizeof(uint16_t));
+
+
+	if ((root[0] != '\\')
+			|| (root[1] != 'D') || (root[2] != 'e')
+			|| (root[3] != 'v') || (root[4] != 'i')
+			|| (root[5] != 'c') || (root[6] != 'e')
+			|| (root[7] != '\\'))
+		return OS_STATUS_INTERNAL_ERROR;
+
+	for (root=&root[8]; (root<wch) && (*root!='\\'); )
+		root++;
+
+	if ((uint16_t)((++root - path->buffer) * sizeof(uint16_t)) == path->strlen)
+		return OS_STATUS_MORE_PROCESSING_REQUIRED;
+
+	/* physical parent directory path */
+	for (; (wch>root) && (wch[-1]!='\\'); )
+		wch--;
+
+	path->strlen = sizeof(uint16_t) * (uint16_t)(wch-path->buffer);
+	path->maxlen = 0;
+
+	/* oa */
+	oa.len      = sizeof(struct os_oa);
+	oa.root_dir = 0;
+	oa.obj_name = path;
+	oa.obj_attr = 0;
+	oa.sec_desc = 0;
+	oa.sec_qos  = 0;
+
+	/* default access */
+	desired_access = desired_access
+		? desired_access
+		: OS_SEC_SYNCHRONIZE | OS_FILE_READ_ATTRIBUTES | OS_FILE_READ_ACCESS;
+
+	/* open parent directory */
+	return zw_open_file(
+		hparent,
+		desired_access,
+		&oa,
+		&iosb,
+		OS_FILE_SHARE_READ | OS_FILE_SHARE_WRITE,
+		open_options | OS_FILE_DIRECTORY_FILE);
+}