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/********************************************************/
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/* ntapi: Native API core library */
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/* Copyright (C) 2013--2021 Z. Gilboa */
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/* Released under GPLv2 and GPLv3; see COPYING.NTAPI. */
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/********************************************************/
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#include <ntapi/ntapi.h>
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#include <ntapi/nt_file.h>
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#include "ntapi_impl.h"
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int32_t __stdcall __ntapi_tt_open_physical_parent_directory(
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__out void ** hparent,
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__in void * hdir,
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__out void * buffer,
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__in uint32_t buffer_size,
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__in uint32_t oattr,
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__in uint32_t desired_access,
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__in uint32_t share_access,
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__in uint32_t open_options,
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__out int * reserved)
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{
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int32_t status;
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nt_oa oa;
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nt_iosb iosb;
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wchar16_t * wch;
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wchar16_t * root;
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nt_unicode_string * path;
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uint32_t len;
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int mup;
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uintptr_t addr;
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uintptr_t addr_cap;
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(void)reserved;
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addr = (uintptr_t)buffer;
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addr_cap = addr + buffer_size;
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addr += 0xf;
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addr |= 0xf;
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addr ^= 0xf;
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path = (nt_unicode_string *)addr;
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buffer_size = addr_cap - addr;
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if ((status = __ntapi->zw_query_object(
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hdir,
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NT_OBJECT_NAME_INFORMATION,
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path,
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buffer_size,
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&len)))
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return status;
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/* integrity */
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if (len == sizeof(nt_unicode_string))
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return NT_STATUS_BAD_FILE_TYPE;
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/* device root directory */
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root = path->buffer;
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wch = path->buffer + (path->strlen / sizeof(uint16_t));
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if ((wch < &root[8])
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|| (root[0] != '\\')
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|| (root[1] != 'D') || (root[2] != 'e')
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|| (root[3] != 'v') || (root[4] != 'i')
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|| (root[5] != 'c') || (root[6] != 'e')
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|| (root[7] != '\\'))
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return NT_STATUS_INTERNAL_ERROR;
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mup = (wch > &root[11])
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&& (root[8]=='M')
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&& (root[9]=='u')
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&& (root[10]=='p')
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&& (root[11]=='\\');
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root = mup ? &root[12] : &root[8];
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for (; (root
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root++;
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if (root == wch)
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return NT_STATUS_INTERNAL_ERROR;
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if (mup)
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for (root++; (root
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root++;
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if (root == wch)
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return NT_STATUS_INTERNAL_ERROR;
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if (&root[1] == wch)
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return NT_STATUS_MORE_PROCESSING_REQUIRED;
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if (wch[-1] == '\\')
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wch--;
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/* physical parent directory path */
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for (root++; (wch>=root) && (wch[-1]!='\\'); )
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wch--;
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path->strlen = (uint16_t)(wch - path->buffer) * sizeof(uint16_t);
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path->maxlen = 0;
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/* oa */
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oa.len = sizeof(nt_oa);
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oa.root_dir = 0;
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oa.obj_name = path;
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oa.obj_attr = oattr,
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oa.sec_desc = 0;
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oa.sec_qos = 0;
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/* default access */
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desired_access = desired_access
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? desired_access
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: NT_SEC_SYNCHRONIZE | NT_FILE_READ_ATTRIBUTES | NT_FILE_READ_ACCESS;
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/* open parent directory */
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return __ntapi->zw_open_file(
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hparent,
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desired_access,
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&oa,&iosb,
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share_access,
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open_options | NT_FILE_DIRECTORY_FILE);
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}
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