From 116d1ede0cc0d5d57f593264251668531252c74b Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Wed, 6 May 2015 22:22:41 +0300
Subject: initial commit

---
 src/nt_path_converter/device.c | 185 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 185 insertions(+)
 create mode 100644 src/nt_path_converter/device.c

(limited to 'src/nt_path_converter/device.c')

diff --git a/src/nt_path_converter/device.c b/src/nt_path_converter/device.c
new file mode 100644
index 0000000..90fcc98
--- /dev/null
+++ b/src/nt_path_converter/device.c
@@ -0,0 +1,185 @@
+/**
+ * \file
+ * \author Egor Tensin <Egor.Tensin@gmail.com>
+ * \copyright This file is licensed under the terms of the MIT License.
+ *            See LICENSE.txt for details.
+ */
+
+#include "control_codes.h"
+#include "device.h"
+#include "nt2dos.h"
+
+#include <ntddk.h>
+
+static NTSTATUS device_open(DEVICE_OBJECT *device_object, IRP *irp)
+{
+    NTSTATUS status = STATUS_SUCCESS;
+
+    irp->IoStatus.Status = status;
+    irp->IoStatus.Information = 0;
+    IoCompleteRequest(irp, IO_NO_INCREMENT);
+    return status;
+}
+
+typedef NTSTATUS (*ioctl_handler)(void *, unsigned long,
+                                  void *, unsigned long,
+                                  ULONG_PTR *);
+
+static NTSTATUS handle_convert_nt_path(void *in_buf,
+                                       unsigned long in_buf_size,
+                                       void *out_buf,
+                                       unsigned long out_buf_size,
+                                       ULONG_PTR *nbwritten)
+{
+    UNICODE_STRING uUnresolved, uResolved;
+    NTSTATUS status = STATUS_SUCCESS;
+
+    RtlInitUnicodeString(&uUnresolved, (WCHAR *) in_buf);
+    status = nt2dos(&uResolved, &uUnresolved);
+
+    if (!NT_SUCCESS(status))
+        return status;
+
+    *nbwritten = uResolved.Length;
+
+    if (out_buf_size < uResolved.Length)
+    {
+        status = STATUS_BUFFER_OVERFLOW;
+        goto FREE_RESOLVED;
+    }
+
+    RtlCopyMemory(out_buf, uResolved.Buffer, uResolved.Length);
+
+FREE_RESOLVED:
+    ExFreePool(uResolved.Buffer);
+
+    return status;
+}
+
+static NTSTATUS device_ioctl(DEVICE_OBJECT *device_object, IRP *irp)
+{
+    IO_STACK_LOCATION *io_stack_loc;
+    void* in_buf, *out_buf;
+    unsigned long in_buf_size, out_buf_size;
+    ioctl_handler handler;
+    NTSTATUS status = STATUS_UNSUCCESSFUL;
+
+    irp->IoStatus.Status = status;
+    irp->IoStatus.Information = 0;
+    io_stack_loc = IoGetCurrentIrpStackLocation(irp);
+
+    in_buf = out_buf = irp->AssociatedIrp.SystemBuffer;
+    in_buf_size = io_stack_loc->Parameters.DeviceIoControl.InputBufferLength;
+    out_buf_size = io_stack_loc->Parameters.DeviceIoControl.OutputBufferLength;
+
+    switch (io_stack_loc->Parameters.DeviceIoControl.IoControlCode)
+    {
+        case CONVERT_NT_PATH:
+            handler = handle_convert_nt_path;
+            break;
+        default:
+            status = irp->IoStatus.Status = STATUS_NOT_SUPPORTED;
+            goto complete_request;
+    }
+
+    status = irp->IoStatus.Status = handler(in_buf, in_buf_size,
+                                            out_buf, out_buf_size,
+                                            &irp->IoStatus.Information);
+
+complete_request:
+    IoCompleteRequest(irp, IO_NO_INCREMENT);
+
+    return status;
+}
+
+typedef struct
+{
+    const wchar_t *path;
+    const wchar_t *symlink;
+} device_info;
+
+typedef struct
+{
+    DEVICE_OBJECT *object;
+    UNICODE_STRING path;
+    UNICODE_STRING symlink;
+} device;
+
+#define NUMOF_DEVICES 1
+
+static device_info devices_info[NUMOF_DEVICES] =
+{
+    {
+        L"\\Device\\nt_path_converter",
+        L"\\DosDevices\\nt_path_converter",
+    },
+};
+
+static device devices[NUMOF_DEVICES];
+
+static void destroy_device(int i)
+{
+    IoDeleteSymbolicLink(&devices[i].symlink);
+    IoDeleteDevice(devices[i].object);
+}
+
+void destroy_devices()
+{
+    int i;
+    for (i = 0; i < NUMOF_DEVICES; ++i)
+        destroy_device(i);
+}
+
+static NTSTATUS set_up_device(DRIVER_OBJECT *driver_object, int i)
+{
+    NTSTATUS status = STATUS_SUCCESS;
+
+    RtlInitUnicodeString(&devices[i].path, devices_info[i].path);
+    RtlInitUnicodeString(&devices[i].symlink, devices_info[i].symlink);
+
+    status = IoCreateDevice(driver_object,
+                            0,
+                            &devices[i].path,
+                            FILE_DEVICE_UNKNOWN,
+                            FILE_DEVICE_SECURE_OPEN,
+                            FALSE,
+                            &devices[i].object);
+
+    if (!NT_SUCCESS(status))
+        return status;
+
+    devices[i].object->Flags |= DO_BUFFERED_IO;
+    devices[i].object->Flags &= ~DO_DEVICE_INITIALIZING;
+
+    if (!NT_SUCCESS(status = IoCreateSymbolicLink(&devices[i].symlink,
+                                                  &devices[i].path)))
+        goto delete_device;
+
+    return status;
+
+delete_device:
+    IoDeleteDevice(devices[i].object);
+
+    return status;
+}
+
+NTSTATUS set_up_devices(DRIVER_OBJECT *driver_object)
+{
+    int i, j;
+    NTSTATUS status = STATUS_SUCCESS;
+
+    for (i = 0; i < NUMOF_DEVICES; ++i)
+        if (!NT_SUCCESS(status = set_up_device(driver_object, i)))
+            goto destroy_devices;
+
+    driver_object->MajorFunction[IRP_MJ_CREATE] = device_open;
+    driver_object->MajorFunction[IRP_MJ_DEVICE_CONTROL] = device_ioctl;
+
+    return status;
+
+destroy_devices:
+    for (j = 0; j < i; ++j)
+        destroy_device(j);
+
+    return status;
+}
-- 
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