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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/base/network_change_notifier_fuchsia.h"
#include <fuchsia/net/interfaces/cpp/fidl.h>
#include <lib/sys/cpp/component_context.h>
#include <algorithm>
#include <utility>
#include <vector>
#include "base/fuchsia/fuchsia_logging.h"
#include "base/fuchsia/process_context.h"
#include "base/logging.h"
#include "base/process/process.h"
#include "base/threading/thread_checker.h"
#include "base/types/expected.h"
#include "net/base/fuchsia/network_interface_cache.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
namespace net {
NetworkChangeNotifierFuchsia::NetworkChangeNotifierFuchsia(bool require_wlan)
: NetworkChangeNotifierFuchsia(internal::ConnectInterfacesWatcher(),
require_wlan,
/*system_dns_config_notifier=*/nullptr) {}
NetworkChangeNotifierFuchsia::NetworkChangeNotifierFuchsia(
fuchsia::net::interfaces::WatcherHandle watcher_handle,
bool require_wlan,
SystemDnsConfigChangeNotifier* system_dns_config_notifier)
: NetworkChangeNotifier(NetworkChangeCalculatorParams(),
system_dns_config_notifier),
cache_(require_wlan) {
DCHECK(watcher_handle);
std::vector<fuchsia::net::interfaces::Properties> interfaces;
auto handle_or_status = internal::ReadExistingNetworkInterfacesFromNewWatcher(
std::move(watcher_handle), interfaces);
if (!handle_or_status.has_value()) {
ZX_LOG(ERROR, handle_or_status.error()) << "ReadExistingNetworkInterfaces";
base::Process::TerminateCurrentProcessImmediately(1);
}
HandleCacheStatus(cache_.AddInterfaces(std::move(interfaces)));
watcher_.set_error_handler(base::LogFidlErrorAndExitProcess(
FROM_HERE, "fuchsia.net.interfaces.Watcher"));
zx_status_t bind_status = watcher_.Bind(std::move(handle_or_status.value()));
ZX_CHECK(bind_status == ZX_OK, bind_status) << "Bind()";
watcher_->Watch(
fit::bind_member(this, &NetworkChangeNotifierFuchsia::OnInterfacesEvent));
}
NetworkChangeNotifierFuchsia::~NetworkChangeNotifierFuchsia() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
ClearGlobalPointer();
}
NetworkChangeNotifier::ConnectionType
NetworkChangeNotifierFuchsia::GetCurrentConnectionType() const {
return cache_.GetConnectionType();
}
const internal::NetworkInterfaceCache*
NetworkChangeNotifierFuchsia::GetNetworkInterfaceCacheInternal() const {
return &cache_;
}
void NetworkChangeNotifierFuchsia::OnInterfacesEvent(
fuchsia::net::interfaces::Event event) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
// Immediately trigger the next watch, which will happen asynchronously. If
// event processing encounters an error it'll close the watcher channel which
// will cancel any pending callbacks.
watcher_->Watch(
fit::bind_member(this, &NetworkChangeNotifierFuchsia::OnInterfacesEvent));
switch (event.Which()) {
case fuchsia::net::interfaces::Event::kAdded:
HandleCacheStatus(cache_.AddInterface(std::move(event.added())));
break;
case fuchsia::net::interfaces::Event::kRemoved:
HandleCacheStatus(cache_.RemoveInterface(event.removed()));
break;
case fuchsia::net::interfaces::Event::kChanged:
HandleCacheStatus(cache_.ChangeInterface(std::move(event.changed())));
break;
default:
LOG(ERROR) << "Unexpected event: " << event.Which();
watcher_.Unbind();
cache_.SetError();
break;
}
}
void NetworkChangeNotifierFuchsia::HandleCacheStatus(
absl::optional<internal::NetworkInterfaceCache::ChangeBits> change_bits) {
if (!change_bits.has_value()) {
watcher_.Unbind();
return;
}
if (change_bits.value() &
internal::NetworkInterfaceCache::kIpAddressChanged) {
NotifyObserversOfIPAddressChange();
}
if (change_bits.value() &
internal::NetworkInterfaceCache::kConnectionTypeChanged) {
NotifyObserversOfConnectionTypeChange();
}
}
namespace internal {
fuchsia::net::interfaces::WatcherHandle ConnectInterfacesWatcher() {
fuchsia::net::interfaces::StateSyncPtr state;
zx_status_t status =
base::ComponentContextForProcess()->svc()->Connect(state.NewRequest());
ZX_CHECK(status == ZX_OK, status) << "Connect()";
// GetWatcher() is a feed-forward API, so failures will be observed via
// peer-closed events on the returned `watcher`.
fuchsia::net::interfaces::WatcherHandle watcher;
status = state->GetWatcher(/*options=*/{}, watcher.NewRequest());
return watcher;
}
base::expected<fuchsia::net::interfaces::WatcherHandle, zx_status_t>
ReadExistingNetworkInterfacesFromNewWatcher(
fuchsia::net::interfaces::WatcherHandle watcher_handle,
std::vector<fuchsia::net::interfaces::Properties>& interfaces) {
DCHECK(watcher_handle);
fuchsia::net::interfaces::WatcherSyncPtr watcher = watcher_handle.BindSync();
// fuchsia.net.interfaces.Watcher implements a hanging-get pattern, accepting
// a single Watch() call and returning an event when something changes.
// When a Watcher is first created, it emits a series of events describing
// existing interfaces, terminated by an "idle" event, before entering the
// normal hanging-get flow.
while (true) {
fuchsia::net::interfaces::Event event;
if (auto watch_status = watcher->Watch(&event); watch_status != ZX_OK) {
ZX_LOG(ERROR, watch_status) << "Watch() failed";
return base::unexpected(watch_status);
}
switch (event.Which()) {
case fuchsia::net::interfaces::Event::Tag::kExisting:
interfaces.push_back(std::move(event.existing()));
break;
case fuchsia::net::interfaces::Event::Tag::kIdle:
// Idle means we've listed all the existing interfaces. We can stop
// fetching events.
return base::ok(watcher.Unbind());
default:
LOG(ERROR) << "Unexpected event " << event.Which();
return base::unexpected(ZX_ERR_BAD_STATE);
}
}
}
} // namespace internal
} // namespace net
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