moonlight-stream/moonlight-common-c
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Don't require linking to wlanapi.dll

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This is not always available on Windows Server
This commit is contained in:
Cameron Gutman 2020-09-08 18:26:36 -07:00
parent 128c1503f2
commit dbedf938d4
1 changed files with 58 additions and 9 deletions
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67
src/PlatformSockets.c
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@ -10,7 +10,15 @@
#define TCPv6_MSS 1220
#if defined(LC_WINDOWS)
static HMODULE WlanApiLibraryHandle;
static HANDLE WlanHandle;
DWORD (WINAPI *pfnWlanOpenHandle)(DWORD dwClientVersion, PVOID pReserved, PDWORD pdwNegotiatedVersion, PHANDLE phClientHandle);
DWORD (WINAPI *pfnWlanCloseHandle)(HANDLE hClientHandle, PVOID pReserved);
DWORD (WINAPI *pfnWlanEnumInterfaces)(HANDLE hClientHandle, PVOID pReserved, PWLAN_INTERFACE_INFO_LIST *ppInterfaceList);
VOID (WINAPI *pfnWlanFreeMemory)(PVOID pMemory);
DWORD (WINAPI *pfnWlanSetInterface)(HANDLE hClientHandle, CONST GUID *pInterfaceGuid, WLAN_INTF_OPCODE OpCode, DWORD dwDataSize, CONST PVOID pData, PVOID pReserved);
#endif
void addrToUrlSafeString(struct sockaddr_storage* addr, char* string)
@ -547,14 +555,43 @@ void enterLowLatencyMode(void) {
// Reduce timer period to increase wait precision
timeBeginPeriod(1);
// Use the Vista+ WLAN API version
LC_ASSERT(WlanHandle == NULL);
if (WlanOpenHandle(WLAN_API_MAKE_VERSION(2, 0), NULL, &negotiatedVersion, &WlanHandle) != ERROR_SUCCESS) {
// Load wlanapi.dll dynamically because it will not always be present on Windows Server SKUs.
WlanApiLibraryHandle = LoadLibraryA("wlanapi.dll");
if (WlanApiLibraryHandle == NULL) {
Limelog("WLANAPI is not supported on this OS\n");
return;
}
if (WlanEnumInterfaces(WlanHandle, NULL, &wlanInterfaceList) != ERROR_SUCCESS) {
WlanCloseHandle(WlanHandle, NULL);
pfnWlanOpenHandle = GetProcAddress(WlanApiLibraryHandle, "WlanOpenHandle");
pfnWlanCloseHandle = GetProcAddress(WlanApiLibraryHandle, "WlanCloseHandle");
pfnWlanFreeMemory = GetProcAddress(WlanApiLibraryHandle, "WlanFreeMemory");
pfnWlanEnumInterfaces = GetProcAddress(WlanApiLibraryHandle, "WlanEnumInterfaces");
pfnWlanSetInterface = GetProcAddress(WlanApiLibraryHandle, "WlanSetInterface");
if (pfnWlanOpenHandle == NULL || pfnWlanCloseHandle == NULL ||
pfnWlanFreeMemory == NULL || pfnWlanEnumInterfaces == NULL || pfnWlanSetInterface == NULL) {
LC_ASSERT(pfnWlanOpenHandle != NULL);
LC_ASSERT(pfnWlanCloseHandle != NULL);
LC_ASSERT(pfnWlanFreeMemory != NULL);
LC_ASSERT(pfnWlanEnumInterfaces != NULL);
LC_ASSERT(pfnWlanSetInterface != NULL);
// This should never happen since that would mean Microsoft removed a public API, but
// we'll check and fail gracefully just in case.
FreeLibrary(WlanApiLibraryHandle);
WlanApiLibraryHandle = NULL;
return;
}
// Use the Vista+ WLAN API version
LC_ASSERT(WlanHandle == NULL);
if (pfnWlanOpenHandle(WLAN_API_MAKE_VERSION(2, 0), NULL, &negotiatedVersion, &WlanHandle) != ERROR_SUCCESS) {
WlanHandle = NULL;
return;
}
if (pfnWlanEnumInterfaces(WlanHandle, NULL, &wlanInterfaceList) != ERROR_SUCCESS) {
pfnWlanCloseHandle(WlanHandle, NULL);
WlanHandle = NULL;
return;
}
@ -570,15 +607,15 @@ void enterLowLatencyMode(void) {
// https://docs.microsoft.com/en-us/windows-hardware/drivers/network/oid-wdi-set-connection-quality
// https://docs.microsoft.com/en-us/previous-versions/windows/hardware/wireless/native-802-11-media-streaming
value = TRUE;
error = WlanSetInterface(WlanHandle, &wlanInterfaceList->InterfaceInfo[i].InterfaceGuid,
wlan_intf_opcode_media_streaming_mode, sizeof(value), &value, NULL);
error = pfnWlanSetInterface(WlanHandle, &wlanInterfaceList->InterfaceInfo[i].InterfaceGuid,
wlan_intf_opcode_media_streaming_mode, sizeof(value), &value, NULL);
if (error == ERROR_SUCCESS) {
Limelog("WLAN interface %d is now in low latency mode\n", i);
}
}
}
WlanFreeMemory(wlanInterfaceList);
pfnWlanFreeMemory(wlanInterfaceList);
#else
#endif
}
@ -587,10 +624,22 @@ void exitLowLatencyMode(void) {
#if defined(LC_WINDOWS)
// Closing our WLAN client handle will undo our optimizations
if (WlanHandle != NULL) {
WlanCloseHandle(WlanHandle, NULL);
pfnWlanCloseHandle(WlanHandle, NULL);
WlanHandle = NULL;
}
// Release the library reference to wlanapi.dll
if (WlanApiLibraryHandle != NULL) {
pfnWlanOpenHandle = NULL;
pfnWlanCloseHandle = NULL;
pfnWlanFreeMemory = NULL;
pfnWlanEnumInterfaces = NULL;
pfnWlanSetInterface = NULL;
FreeLibrary(WlanApiLibraryHandle);
WlanApiLibraryHandle = NULL;
}
// Restore original timer period
timeEndPeriod(1);
#else