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// SynchronousAudioRouter
// Copyright (C) 2017 Mackenzie Straight
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with SynchronousAudioRouter. If not, see <http://www.gnu.org/licenses/>.
#include "sar.h"
#define SAR_NDIS_GUID_STR L"{013656D5-F214-4EF1-BEA7-7151C06EF895}"
#define SAR_NDIS_FRIENDLY_NAME L"Synchronous Audio Router"
#define SAR_NDIS_SERVICE_NAME L"SarNdis"
#define SAR_NDIS_DEVICE_NAME L"\\Device\\SarNdis"
#define SAR_NDIS_SYMBOLIC_NAME L"\\DosDevices\\SarNdis"
#define SAR_NDIS_SDDL_STRING L"D:P(A;;GA;;;AU)"
SarNdisDriverState gDriverState;
DRIVER_UNLOAD SarNdisDriverUnload;
FILTER_SET_OPTIONS SarNdisFilterSetOptions;
FILTER_SET_MODULE_OPTIONS SarNdisFilterSetModuleOptions;
FILTER_ATTACH SarNdisFilterAttach;
FILTER_DETACH SarNdisFilterDetach;
FILTER_RESTART SarNdisFilterRestart;
FILTER_PAUSE SarNdisFilterPause;
FILTER_SEND_NET_BUFFER_LISTS SarNdisFilterSendNetBufferLists;
FILTER_SEND_NET_BUFFER_LISTS_COMPLETE SarNdisFilterSendNetBufferListsComplete;
FILTER_CANCEL_SEND_NET_BUFFER_LISTS SarNdisFilterCancelSendNetBufferLists;
FILTER_RECEIVE_NET_BUFFER_LISTS SarNdisFilterReceiveNetBufferLists;
FILTER_RETURN_NET_BUFFER_LISTS SarNdisFilterReturnNetBufferLists;
FILTER_OID_REQUEST SarNdisFilterOidRequest;
FILTER_OID_REQUEST_COMPLETE SarNdisFilterOidRequestComplete;
FILTER_CANCEL_OID_REQUEST SarNdisFilterCancelOidRequest;
FILTER_DEVICE_PNP_EVENT_NOTIFY SarNdisFilterDevicePnPEventNotify;
FILTER_NET_PNP_EVENT SarNdisFilterNetPnPEvent;
FILTER_STATUS SarNdisFilterStatus;
FILTER_DIRECT_OID_REQUEST SarNdisFilterDirectOidRequest;
FILTER_DIRECT_OID_REQUEST_COMPLETE SarNdisFilterDirectOidRequestComplete;
FILTER_CANCEL_DIRECT_OID_REQUEST SarNdisFilterCancelDirectOidRequest;
DRIVER_DISPATCH SarNdisIrpCreate;
DRIVER_DISPATCH SarNdisIrpClose;
DRIVER_DISPATCH SarNdisIrpCleanup;
DRIVER_DISPATCH SarNdisIrpDeviceIoControl;
VOID SarNdisDeleteFilterModuleContext(SarNdisFilterModuleContext *context)
{
if (context->instanceName.Buffer) {
SarStringFree(&context->instanceName);
}
ExFreePoolWithTag(context, SAR_TAG);
}
_Use_decl_annotations_
NDIS_STATUS SarNdisFilterAttach(
_In_ NDIS_HANDLE ndisFilterHandle,
_In_ NDIS_HANDLE filterDriverContext,
_In_ PNDIS_FILTER_ATTACH_PARAMETERS attachParameters)
{
SAR_TRACE("SarNdisFilterAttach");
SAR_DEBUG("Attaching to miniport: %wZ (instance name %wZ)",
attachParameters->BaseMiniportName,
attachParameters->BaseMiniportInstanceName);
UNREFERENCED_PARAMETER(filterDriverContext);
NTSTATUS status = STATUS_SUCCESS;
NDIS_FILTER_ATTRIBUTES filterAttributes;
SarNdisFilterModuleContext *context =
(SarNdisFilterModuleContext *)ExAllocatePoolWithTag(
NonPagedPool, sizeof(SarNdisFilterModuleContext), SAR_TAG);
if (!context) {
status = STATUS_INSUFFICIENT_RESOURCES;
goto err_out;
}
RtlZeroMemory(context, sizeof(SarNdisFilterModuleContext));
context->refs = 1;
context->filterHandle = ndisFilterHandle;
status = SarStringDuplicate(
&context->instanceName, attachParameters->BaseMiniportInstanceName);
if (!NT_SUCCESS(status)) {
goto err_out;
}
filterAttributes.Header.Type = NDIS_OBJECT_TYPE_FILTER_ATTRIBUTES;
filterAttributes.Header.Revision = NDIS_FILTER_ATTRIBUTES_REVISION_1;
filterAttributes.Header.Size = NDIS_SIZEOF_FILTER_ATTRIBUTES_REVISION_1;
filterAttributes.Flags = 0;
status = NdisFSetAttributes(ndisFilterHandle, context, &filterAttributes);
if (!NT_SUCCESS(status)) {
goto err_out;
}
return STATUS_SUCCESS;
err_out:
if (context != NULL) {
SarNdisDeleteFilterModuleContext(context);
}
return status;
}
_Use_decl_annotations_
VOID SarNdisFilterDetach(_In_ NDIS_HANDLE filterModuleContext)
{
SAR_TRACE("SarNdisFilterDetach");
SarNdisFilterModuleContext *context =
(SarNdisFilterModuleContext *)filterModuleContext;
SarNdisReleaseFilterModuleContext(context);
}
_Use_decl_annotations_
NDIS_STATUS SarNdisFilterRestart(
_In_ NDIS_HANDLE filterModuleContext,
_In_ PNDIS_FILTER_RESTART_PARAMETERS filterRestartParameters)
{
SAR_TRACE("SarNdisFilterRestart");
UNREFERENCED_PARAMETER(filterRestartParameters);
SarNdisFilterModuleContext *context =
(SarNdisFilterModuleContext *)filterModuleContext;
context->running = true;
ExAcquireFastMutex(&gDriverState.mutex);
InsertTailList(&gDriverState.runningFilters, &context->runningFiltersEntry);
SarNdisRetainFilterModuleContext(context);
ExReleaseFastMutex(&gDriverState.mutex);
return STATUS_SUCCESS;
}
_Use_decl_annotations_
NDIS_STATUS SarNdisFilterPause(
_In_ NDIS_HANDLE filterModuleContext,
_In_ PNDIS_FILTER_PAUSE_PARAMETERS filterPauseParameters)
{
SAR_TRACE("SarNdisFilterPause");
UNREFERENCED_PARAMETER(filterPauseParameters);
SarNdisFilterModuleContext *context =
(SarNdisFilterModuleContext *)filterModuleContext;
context->running = false;
ExAcquireFastMutex(&gDriverState.mutex);
RemoveEntryList(&context->runningFiltersEntry);
ExReleaseFastMutex(&gDriverState.mutex);
SarNdisReleaseFilterModuleContext(context);
return STATUS_SUCCESS;
}
_Use_decl_annotations_
VOID SarNdisFilterSendNetBufferLists(
_In_ NDIS_HANDLE filterModuleContext,
_In_ PNET_BUFFER_LIST netBufferLists,
_In_ NDIS_PORT_NUMBER portNumber,
_In_ ULONG sendFlags)
{
UNREFERENCED_PARAMETER(portNumber);
SarNdisFilterModuleContext *context =
(SarNdisFilterModuleContext *)filterModuleContext;
if (context->running && context->enabled) {
SAR_TRACE("SarNdisFilterSendNetBufferLists");
NdisFSendNetBufferListsComplete(
context->filterHandle, netBufferLists,
(sendFlags & NDIS_SEND_FLAGS_SWITCH_SINGLE_SOURCE) ?
NDIS_SEND_COMPLETE_FLAGS_SWITCH_SINGLE_SOURCE : 0);
} else {
NdisFSendNetBufferLists(
context->filterHandle, netBufferLists, portNumber, sendFlags);
}
}
_Use_decl_annotations_
NTSTATUS SarNdisIrpCreate(
_In_ PDEVICE_OBJECT deviceObject,
_In_ PIRP irp)
{
SAR_TRACE("SarNdisIrpCreate");
UNREFERENCED_PARAMETER(deviceObject);
irp->IoStatus.Status = STATUS_SUCCESS;
IoCompleteRequest(irp, IO_NO_INCREMENT);
return STATUS_SUCCESS;
}
_Use_decl_annotations_
NTSTATUS SarNdisIrpClose(
_In_ PDEVICE_OBJECT deviceObject,
_In_ PIRP irp)
{
SAR_TRACE("SarNdisIrpClose");
UNREFERENCED_PARAMETER(deviceObject);
irp->IoStatus.Status = STATUS_SUCCESS;
IoCompleteRequest(irp, IO_NO_INCREMENT);
return STATUS_SUCCESS;
}
_Use_decl_annotations_
NTSTATUS SarNdisIrpCleanup(
_In_ PDEVICE_OBJECT deviceObject,
_In_ PIRP irp)
{
SAR_TRACE("SarNdisIrpCleanup");
UNREFERENCED_PARAMETER(deviceObject);
irp->IoStatus.Status = STATUS_SUCCESS;
IoCompleteRequest(irp, IO_NO_INCREMENT);
return STATUS_SUCCESS;
}
_Use_decl_annotations_
NTSTATUS SarNdisIrpDeviceIoControl(
_In_ PDEVICE_OBJECT deviceObject,
_In_ PIRP irp)
{
SAR_TRACE("SarNdisIrpDeviceIoControl");
UNREFERENCED_PARAMETER(deviceObject);
NTSTATUS status = STATUS_UNSUCCESSFUL;
PIO_STACK_LOCATION irpStack = IoGetCurrentIrpStackLocation(irp);
switch (irpStack->Parameters.DeviceIoControl.IoControlCode) {
case SARNDIS_ENUMERATE: {
int count = 0;
PLIST_ENTRY entry;
ExAcquireFastMutex(&gDriverState.mutex);
entry = gDriverState.runningFilters.Flink;
while (entry != &gDriverState.runningFilters) {
entry = entry->Flink;
count++;
}
ExReleaseFastMutex(&gDriverState.mutex);
SAR_INFO("Total number of attached and unpaused filters: %d", count);
break;
}
case SARNDIS_ENABLE:
break;
case SARNDIS_SYNC:
break;
}
if (status != STATUS_PENDING) {
irp->IoStatus.Status = status;
IoCompleteRequest(irp, IO_NO_INCREMENT);
}
return status;
}
_Use_decl_annotations_
VOID SarNdisDriverUnload(PDRIVER_OBJECT driverObject)
{
SAR_TRACE("SarNdisDriverUnload");
UNREFERENCED_PARAMETER(driverObject);
if (gDriverState.deviceHandle) {
NdisDeregisterDeviceEx(gDriverState.deviceHandle);
gDriverState.deviceHandle = NULL;
gDriverState.deviceObject = NULL;
}
if (gDriverState.filterDriverHandle) {
NdisFDeregisterFilterDriver(gDriverState.filterDriverHandle);
gDriverState.filterDriverHandle = NULL;
}
}
extern "C" NTSTATUS DriverEntry(
_In_ PDRIVER_OBJECT driverObject,
_In_ PUNICODE_STRING registryPath)
{
SAR_INFO("SarNdis DriverEntry");
UNREFERENCED_PARAMETER(registryPath);
NDIS_FILTER_DRIVER_CHARACTERISTICS fdc = {};
NDIS_DEVICE_OBJECT_ATTRIBUTES doa = {};
UNICODE_STRING deviceName = {}, deviceLink = {}, sddlString = {};
DRIVER_DISPATCH *dispatch[IRP_MJ_MAXIMUM_FUNCTION + 1] = {};
NTSTATUS status = STATUS_SUCCESS;
ExInitializeFastMutex(&gDriverState.mutex);
InitializeListHead(&gDriverState.runningFilters);
fdc.Header.Type = NDIS_OBJECT_TYPE_FILTER_DRIVER_CHARACTERISTICS;
fdc.Header.Revision = NDIS_FILTER_CHARACTERISTICS_REVISION_2;
fdc.Header.Size = NDIS_SIZEOF_FILTER_DRIVER_CHARACTERISTICS_REVISION_2;
fdc.MajorNdisVersion = 6;
fdc.MinorNdisVersion = 30;
fdc.MajorDriverVersion = 1;
fdc.MinorDriverVersion = 0;
RtlUnicodeStringInit(&fdc.FriendlyName, SAR_NDIS_FRIENDLY_NAME);
RtlUnicodeStringInit(&fdc.UniqueName, SAR_NDIS_GUID_STR);
RtlUnicodeStringInit(&fdc.ServiceName, SAR_NDIS_SERVICE_NAME);
fdc.AttachHandler = SarNdisFilterAttach;
fdc.DetachHandler = SarNdisFilterDetach;
fdc.PauseHandler = SarNdisFilterPause;
fdc.RestartHandler = SarNdisFilterRestart;
fdc.SendNetBufferListsHandler = SarNdisFilterSendNetBufferLists;
driverObject->DriverUnload = SarNdisDriverUnload;
status = NdisFRegisterFilterDriver(
driverObject, (NDIS_HANDLE)driverObject, &fdc,
&gDriverState.filterDriverHandle);
if (!NT_SUCCESS(status)) {
return status;
}
doa.Header.Type = NDIS_OBJECT_TYPE_DEVICE_OBJECT_ATTRIBUTES;
doa.Header.Revision = NDIS_DEVICE_OBJECT_ATTRIBUTES_REVISION_1;
doa.Header.Size = NDIS_SIZEOF_DEVICE_OBJECT_ATTRIBUTES_REVISION_1;
RtlUnicodeStringInit(&deviceName, SAR_NDIS_DEVICE_NAME);
doa.DeviceName = &deviceName;
RtlUnicodeStringInit(&deviceLink, SAR_NDIS_SYMBOLIC_NAME);
doa.SymbolicName = &deviceLink;
dispatch[IRP_MJ_CREATE] = SarNdisIrpCreate;
dispatch[IRP_MJ_CLOSE] = SarNdisIrpClose;
dispatch[IRP_MJ_CLEANUP] = SarNdisIrpCleanup;
dispatch[IRP_MJ_DEVICE_CONTROL] = SarNdisIrpDeviceIoControl;
doa.MajorFunctions = dispatch;
// Grants access to the device for all users. TODO: configure this as a
// parameter from the installer.
RtlUnicodeStringInit(&sddlString, SAR_NDIS_SDDL_STRING);
doa.DefaultSDDLString = &sddlString;
status = NdisRegisterDeviceEx(
gDriverState.filterDriverHandle, &doa,
&gDriverState.deviceObject, &gDriverState.deviceHandle);
if (!NT_SUCCESS(status)) {
NdisFDeregisterFilterDriver(gDriverState.filterDriverHandle);
return status;
}
return STATUS_SUCCESS;
}