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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <jni.h>
#include <algorithm>
#include <memory>
#include <optional>
#include <string>
#include <utility>
#include <vector>
#include "base/android/jni_array.h"
#include "base/android/jni_string.h"
#include "base/android/scoped_java_ref.h"
#include "base/check.h"
#include "base/functional/bind.h"
#include "base/strings/utf_string_conversions.h"
#include "base/synchronization/waitable_event.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/net/dns_probe_runner.h"
#include "chrome/browser/net/secure_dns_config.h"
#include "chrome/browser/net/secure_dns_util.h"
#include "chrome/browser/net/stub_resolver_config_reader.h"
#include "chrome/browser/net/system_network_context_manager.h"
#include "chrome/common/pref_names.h"
#include "components/country_codes/country_codes.h"
#include "components/prefs/pref_service.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "net/dns/public/dns_over_https_config.h"
#include "net/dns/public/doh_provider_entry.h"
#include "net/dns/public/secure_dns_mode.h"
// Must come after all headers that specialize FromJniType() / ToJniType().
#include "chrome/browser/privacy/jni_headers/SecureDnsBridge_jni.h"
using base::android::JavaParamRef;
using base::android::ScopedJavaLocalRef;
using chrome_browser_net::DnsProbeRunner;
namespace secure_dns = chrome_browser_net::secure_dns;
namespace {
net::DohProviderEntry::List GetFilteredProviders() {
// Note: Check whether each provider is enabled *after* filtering based on
// country code so that if we are doing experimentation via Finch for a
// regional provider, the experiment groups will be less likely to include
// users from other regions unnecessarily (since a client will be included in
// the experiment if the provider feature flag is checked).
return secure_dns::SelectEnabledProviders(secure_dns::ProvidersForCountry(
net::DohProviderEntry::GetList(), country_codes::GetCurrentCountryID()));
}
// Runs a DNS probe according to the configuration in |overrides|,
// asynchronously sets |success| to indicate the result, and signals
// |waiter| when the probe has completed. Must run on the UI thread.
void RunProbe(base::WaitableEvent* waiter,
bool* success,
const std::string& doh_config) {
std::optional<net::DnsOverHttpsConfig> parsed =
net::DnsOverHttpsConfig::FromString(doh_config);
DCHECK(parsed.has_value()); // `doh_config` must be valid.
auto* manager = g_browser_process->system_network_context_manager();
auto runner = secure_dns::MakeProbeRunner(
std::move(*parsed),
base::BindRepeating(&SystemNetworkContextManager::GetContext,
base::Unretained(manager)));
auto* const runner_ptr = runner.get();
runner_ptr->RunProbe(base::BindOnce(
[](base::WaitableEvent* waiter, bool* success,
std::unique_ptr<DnsProbeRunner> runner) {
*success = runner->result() == DnsProbeRunner::CORRECT;
waiter->Signal();
},
waiter, success, std::move(runner)));
}
} // namespace
static jint JNI_SecureDnsBridge_GetMode(JNIEnv* env) {
return static_cast<int>(
SystemNetworkContextManager::GetStubResolverConfigReader()
->GetSecureDnsConfiguration(
true /* force_check_parental_controls_for_automatic_mode */)
.mode());
}
static void JNI_SecureDnsBridge_SetMode(JNIEnv* env, jint mode) {
PrefService* local_state = g_browser_process->local_state();
local_state->SetString(
prefs::kDnsOverHttpsMode,
SecureDnsConfig::ModeToString(static_cast<net::SecureDnsMode>(mode)));
}
static jboolean JNI_SecureDnsBridge_IsModeManaged(JNIEnv* env) {
PrefService* local_state = g_browser_process->local_state();
return local_state->IsManagedPreference(prefs::kDnsOverHttpsMode);
}
static ScopedJavaLocalRef<jobjectArray> JNI_SecureDnsBridge_GetProviders(
JNIEnv* env) {
net::DohProviderEntry::List providers = GetFilteredProviders();
std::vector<std::vector<std::u16string>> ret;
ret.reserve(providers.size());
std::ranges::transform(
providers, std::back_inserter(ret),
[](const net::DohProviderEntry* entry) -> std::vector<std::u16string> {
net::DnsOverHttpsConfig config({entry->doh_server_config});
return {base::UTF8ToUTF16(entry->ui_name),
base::UTF8ToUTF16(config.ToString()),
base::UTF8ToUTF16(entry->privacy_policy)};
});
return base::android::ToJavaArrayOfStringArray(env, ret);
}
static ScopedJavaLocalRef<jstring> JNI_SecureDnsBridge_GetConfig(JNIEnv* env) {
PrefService* local_state = g_browser_process->local_state();
return base::android::ConvertUTF8ToJavaString(
env, local_state->GetString(prefs::kDnsOverHttpsTemplates));
}
static jboolean JNI_SecureDnsBridge_SetConfig(
JNIEnv* env,
const JavaParamRef<jstring>& jconfig) {
PrefService* local_state = g_browser_process->local_state();
std::string config = base::android::ConvertJavaStringToUTF8(jconfig);
if (config.empty()) {
local_state->ClearPref(prefs::kDnsOverHttpsTemplates);
return true;
}
if (net::DnsOverHttpsConfig::FromString(config).has_value()) {
local_state->SetString(prefs::kDnsOverHttpsTemplates, config);
return true;
}
return false;
}
static jint JNI_SecureDnsBridge_GetManagementMode(JNIEnv* env) {
return static_cast<int>(
SystemNetworkContextManager::GetStubResolverConfigReader()
->GetSecureDnsConfiguration(
true /* force_check_parental_controls_for_automatic_mode */)
.management_mode());
}
static void JNI_SecureDnsBridge_UpdateValidationHistogram(JNIEnv* env,
jboolean valid) {
secure_dns::UpdateValidationHistogram(valid);
}
static jboolean JNI_SecureDnsBridge_ProbeConfig(
JNIEnv* env,
const JavaParamRef<jstring>& doh_config) {
// Android recommends converting async functions to blocking when using JNI:
// https://developer.android.com/training/articles/perf-jni.
// This function converts the DnsProbeRunner, which can only be created and
// used on the UI thread, into a blocking function that can be called from an
// auxiliary Java thread.
// TODO: Use std::future if allowed in the future.
base::WaitableEvent waiter;
bool success;
bool posted = content::GetUIThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(RunProbe, &waiter, &success,
base::android::ConvertJavaStringToUTF8(doh_config)));
DCHECK(posted);
waiter.Wait();
secure_dns::UpdateProbeHistogram(success);
return success;
}
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