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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
#include "ChromiumCDMAdapter.h"
#include <utility>
#include "GMPLog.h"
#include "WidevineUtils.h"
#include "content_decryption_module.h"
#include "content_decryption_module_ext.h"
#include "gmp-api/gmp-entrypoints.h"
#include "gmp-api/gmp-video-codec.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/HelperMacros.h"
#include "mozilla/dom/KeySystemNames.h"
#ifdef XP_WIN
# include "WinUtils.h"
# include "nsWindowsDllInterceptor.h"
# include <windows.h>
# include <strsafe.h>
# include <unordered_map>
# include <vector>
#else
# include <sys/types.h>
# include <sys/stat.h>
# include <unistd.h>
# include <fcntl.h>
#endif
const GMPPlatformAPI* sPlatform = nullptr;
namespace mozilla {
#ifdef XP_WIN
static void InitializeHooks();
#endif
ChromiumCDMAdapter::ChromiumCDMAdapter(
nsTArray<std::pair<nsCString, nsCString>>&& aHostPathPairs) {
#ifdef XP_WIN
InitializeHooks();
#endif
PopulateHostFiles(std::move(aHostPathPairs));
}
void ChromiumCDMAdapter::SetAdaptee(PRLibrary* aLib) { mLib = aLib; }
void* ChromiumCdmHost(int aHostInterfaceVersion, void* aUserData) {
GMP_LOG_DEBUG("ChromiumCdmHostFunc(%d, %p)", aHostInterfaceVersion,
aUserData);
if (aHostInterfaceVersion != cdm::Host_10::kVersion) {
return nullptr;
}
return aUserData;
}
#ifdef MOZILLA_OFFICIAL
static cdm::HostFile TakeToCDMHostFile(HostFileData& aHostFileData) {
return cdm::HostFile(aHostFileData.mBinary.Path().get(),
aHostFileData.mBinary.TakePlatformFile(),
aHostFileData.mSig.TakePlatformFile());
}
#endif
GMPErr ChromiumCDMAdapter::GMPInit(const GMPPlatformAPI* aPlatformAPI) {
GMP_LOG_DEBUG("ChromiumCDMAdapter::GMPInit");
sPlatform = aPlatformAPI;
if (NS_WARN_IF(!mLib)) {
MOZ_CRASH("Missing library!");
return GMPGenericErr;
}
#ifdef MOZILLA_OFFICIAL
// Note: we must call the VerifyCdmHost_0 function if it's present before
// we call the initialize function.
auto verify = reinterpret_cast<decltype(::VerifyCdmHost_0)*>(
PR_FindFunctionSymbol(mLib, MOZ_STRINGIFY(VerifyCdmHost_0)));
if (verify) {
nsTArray<cdm::HostFile> files;
for (HostFileData& hostFile : mHostFiles) {
files.AppendElement(TakeToCDMHostFile(hostFile));
}
bool result = verify(files.Elements(), files.Length());
GMP_LOG_DEBUG("%s VerifyCdmHost_0 returned %d", __func__, result);
MOZ_DIAGNOSTIC_ASSERT(result, "Verification failed!");
}
#endif
auto init = reinterpret_cast<decltype(::INITIALIZE_CDM_MODULE)*>(
PR_FindFunctionSymbol(mLib, MOZ_STRINGIFY(INITIALIZE_CDM_MODULE)));
if (!init) {
MOZ_CRASH("Missing init method!");
return GMPGenericErr;
}
GMP_LOG_DEBUG(MOZ_STRINGIFY(INITIALIZE_CDM_MODULE) "()");
init();
return GMPNoErr;
}
GMPErr ChromiumCDMAdapter::GMPGetAPI(const char* aAPIName, void* aHostAPI,
void** aPluginAPI,
const nsACString& aKeySystem) {
MOZ_ASSERT(
aKeySystem.EqualsLiteral(kWidevineKeySystemName) ||
aKeySystem.EqualsLiteral(kClearKeyKeySystemName) ||
aKeySystem.EqualsLiteral(kClearKeyWithProtectionQueryKeySystemName) ||
aKeySystem.EqualsLiteral("fake"),
"Should not get an unrecognized key system. Why didn't it get "
"blocked by MediaKeySystemAccess?");
GMP_LOG_DEBUG("ChromiumCDMAdapter::GMPGetAPI(%s, 0x%p, 0x%p, %s) this=0x%p",
aAPIName, aHostAPI, aPluginAPI,
PromiseFlatCString(aKeySystem).get(), this);
bool isCdm10 = !strcmp(aAPIName, CHROMIUM_CDM_API);
if (!isCdm10) {
MOZ_ASSERT_UNREACHABLE("We only support and expect cdm10!");
GMP_LOG_DEBUG(
"ChromiumCDMAdapter::GMPGetAPI(%s, 0x%p, 0x%p) this=0x%p got "
"unsupported CDM version!",
aAPIName, aHostAPI, aPluginAPI, this);
return GMPGenericErr;
}
auto create = reinterpret_cast<decltype(::CreateCdmInstance)*>(
PR_FindFunctionSymbol(mLib, "CreateCdmInstance"));
if (!create) {
GMP_LOG_DEBUG(
"ChromiumCDMAdapter::GMPGetAPI(%s, 0x%p, 0x%p) this=0x%p "
"FAILED to find CreateCdmInstance",
aAPIName, aHostAPI, aPluginAPI, this);
return GMPGenericErr;
}
const int version = cdm::ContentDecryptionModule_10::kVersion;
void* cdm = create(version, aKeySystem.BeginReading(), aKeySystem.Length(),
&ChromiumCdmHost, aHostAPI);
if (!cdm) {
GMP_LOG_DEBUG(
"ChromiumCDMAdapter::GMPGetAPI(%s, 0x%p, 0x%p) this=0x%p "
"FAILED to create cdm version %d",
aAPIName, aHostAPI, aPluginAPI, this, version);
return GMPGenericErr;
}
GMP_LOG_DEBUG("cdm: 0x%p, version: %d", cdm, version);
*aPluginAPI = cdm;
return *aPluginAPI ? GMPNoErr : GMPNotImplementedErr;
}
void ChromiumCDMAdapter::GMPShutdown() {
GMP_LOG_DEBUG("ChromiumCDMAdapter::GMPShutdown()");
decltype(::DeinitializeCdmModule)* deinit;
deinit =
(decltype(deinit))(PR_FindFunctionSymbol(mLib, "DeinitializeCdmModule"));
if (deinit) {
GMP_LOG_DEBUG("DeinitializeCdmModule()");
deinit();
}
}
/* static */
bool ChromiumCDMAdapter::Supports(int32_t aModuleVersion,
int32_t aInterfaceVersion,
int32_t aHostVersion) {
return aModuleVersion == CDM_MODULE_VERSION &&
aInterfaceVersion == cdm::ContentDecryptionModule_10::kVersion &&
aHostVersion == cdm::Host_10::kVersion;
}
#ifdef XP_WIN
static WindowsDllInterceptor sKernel32Intercept;
typedef DWORD(WINAPI* QueryDosDeviceWFnPtr)(_In_opt_ LPCWSTR lpDeviceName,
_Out_ LPWSTR lpTargetPath,
_In_ DWORD ucchMax);
static WindowsDllInterceptor::FuncHookType<QueryDosDeviceWFnPtr>
sOriginalQueryDosDeviceWFnPtr;
static std::unordered_map<std::wstring, std::wstring>* sDeviceNames = nullptr;
DWORD WINAPI QueryDosDeviceWHook(LPCWSTR lpDeviceName, LPWSTR lpTargetPath,
DWORD ucchMax) {
if (!sDeviceNames) {
return 0;
}
std::wstring name = std::wstring(lpDeviceName);
auto iter = sDeviceNames->find(name);
if (iter == sDeviceNames->end()) {
return 0;
}
const std::wstring& device = iter->second;
if (device.size() + 1 > ucchMax) {
return 0;
}
PodCopy(lpTargetPath, device.c_str(), device.size());
lpTargetPath[device.size()] = 0;
GMP_LOG_DEBUG("QueryDosDeviceWHook %S -> %S", lpDeviceName, lpTargetPath);
return device.size();
}
static std::vector<std::wstring> GetDosDeviceNames() {
std::vector<std::wstring> v;
std::vector<wchar_t> buf;
buf.resize(1024);
DWORD rv = GetLogicalDriveStringsW(buf.size(), buf.data());
if (rv == 0 || rv > buf.size()) {
return v;
}
// buf will be a list of null terminated strings, with the last string
// being 0 length.
const wchar_t* p = buf.data();
const wchar_t* end = &buf.back();
size_t l;
while (p < end && (l = wcsnlen_s(p, end - p)) > 0) {
// The string is of the form "C:\". We need to strip off the trailing
// backslash.
std::wstring drive = std::wstring(p, p + l);
if (drive.back() == '\\') {
drive.erase(drive.end() - 1);
}
v.push_back(std::move(drive));
p += l + 1;
}
return v;
}
static std::wstring GetDeviceMapping(const std::wstring& aDosDeviceName) {
wchar_t buf[MAX_PATH] = {0};
DWORD rv = QueryDosDeviceW(aDosDeviceName.c_str(), buf, MAX_PATH);
if (rv == 0) {
return std::wstring(L"");
}
return std::wstring(buf, buf + rv);
}
static void InitializeHooks() {
static bool initialized = false;
if (initialized) {
return;
}
initialized = true;
sDeviceNames = new std::unordered_map<std::wstring, std::wstring>();
for (const std::wstring& name : GetDosDeviceNames()) {
sDeviceNames->emplace(name, GetDeviceMapping(name));
}
sKernel32Intercept.Init("kernelbase.dll");
sOriginalQueryDosDeviceWFnPtr.Set(sKernel32Intercept, "QueryDosDeviceW",
&QueryDosDeviceWHook);
}
#endif
HostFile::HostFile(HostFile&& aOther)
: mPath(aOther.mPath), mFile(aOther.TakePlatformFile()) {}
HostFile::~HostFile() {
if (mFile != cdm::kInvalidPlatformFile) {
#ifdef XP_WIN
CloseHandle(mFile);
#else
close(mFile);
#endif
mFile = cdm::kInvalidPlatformFile;
}
}
#ifdef XP_WIN
HostFile::HostFile(const nsCString& aPath)
: mPath(NS_ConvertUTF8toUTF16(aPath)) {
HANDLE handle =
CreateFileW(mPath.get(), GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL, OPEN_EXISTING, 0, NULL);
mFile = (handle == INVALID_HANDLE_VALUE) ? cdm::kInvalidPlatformFile : handle;
}
#endif
#ifndef XP_WIN
HostFile::HostFile(const nsCString& aPath) : mPath(aPath) {
// Note: open() returns -1 on failure; i.e. kInvalidPlatformFile.
mFile = open(aPath.get(), O_RDONLY);
}
#endif
cdm::PlatformFile HostFile::TakePlatformFile() {
cdm::PlatformFile f = mFile;
mFile = cdm::kInvalidPlatformFile;
return f;
}
void ChromiumCDMAdapter::PopulateHostFiles(
nsTArray<std::pair<nsCString, nsCString>>&& aHostPathPairs) {
for (const auto& pair : aHostPathPairs) {
mHostFiles.AppendElement(HostFileData(mozilla::HostFile(pair.first),
mozilla::HostFile(pair.second)));
}
}
} // namespace mozilla