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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 "chrome/browser/ash/net/network_diagnostics/dns_resolver_present_routine.h"
#include <optional>
#include <string>
#include <utility>
#include <vector>
#include "base/functional/bind.h"
#include "chromeos/ash/services/network_config/in_process_instance.h"
#include "chromeos/services/network_config/public/cpp/cros_network_config_util.h"
#include "components/onc/onc_constants.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "net/base/ip_address.h"
namespace ash {
namespace network_diagnostics {
namespace {
namespace mojom = ::chromeos::network_diagnostics::mojom;
// Filters the list of |name_servers| and returns those that are not
// empty/default values.
std::vector<std::string> GetNonEmptyNameServers(
const std::vector<std::string>& name_servers) {
std::vector<std::string> non_empty_name_servers;
for (const auto& name_server : name_servers) {
if (name_server.empty() || name_server == "0.0.0.0" ||
name_server == "::/0") {
continue;
}
non_empty_name_servers.push_back(name_server);
}
return non_empty_name_servers;
}
// Checks that at least one name server IP address is valid depending on the IP
// config type. If the type is not set, IPv4 is assumed.
bool NameServersHaveValidAddresses(
const std::vector<std::string>& name_servers,
chromeos::network_config::mojom::IPConfigType type) {
for (const auto& name_server : name_servers) {
net::IPAddress ip_address;
if (!ip_address.AssignFromIPLiteral(name_server)) {
continue;
}
switch (type) {
case chromeos::network_config::mojom::IPConfigType::kIPv4:
if (ip_address.IsIPv4())
return true;
break;
case chromeos::network_config::mojom::IPConfigType::kIPv6:
if (ip_address.IsIPv6() || ip_address.IsIPv4MappedIPv6())
return true;
break;
}
}
return false;
}
} // namespace
DnsResolverPresentRoutine::DnsResolverPresentRoutine(
chromeos::network_diagnostics::mojom::RoutineCallSource source)
: NetworkDiagnosticsRoutine(source) {
set_verdict(mojom::RoutineVerdict::kNotRun);
network_config::BindToInProcessInstance(
remote_cros_network_config_.BindNewPipeAndPassReceiver());
}
DnsResolverPresentRoutine::~DnsResolverPresentRoutine() = default;
bool DnsResolverPresentRoutine::CanRun() {
DCHECK(remote_cros_network_config_);
return true;
}
mojom::RoutineType DnsResolverPresentRoutine::Type() {
return mojom::RoutineType::kDnsResolverPresent;
}
void DnsResolverPresentRoutine::Run() {
FetchActiveNetworks();
}
void DnsResolverPresentRoutine::AnalyzeResultsAndExecuteCallback() {
if (!connected_network_) {
set_verdict(mojom::RoutineVerdict::kNotRun);
} else if (!name_servers_are_found_) {
set_verdict(mojom::RoutineVerdict::kProblem);
problems_.emplace_back(
mojom::DnsResolverPresentProblem::kNoNameServersFound);
} else if (!name_servers_are_valid_) {
set_verdict(mojom::RoutineVerdict::kProblem);
problems_.emplace_back(
mojom::DnsResolverPresentProblem::kMalformedNameServers);
} else {
// The availability of non-empty, well-formed nameservers ensures that DNS
// resolution should be possible.
set_verdict(mojom::RoutineVerdict::kNoProblem);
}
set_problems(
mojom::RoutineProblems::NewDnsResolverPresentProblems(problems_));
ExecuteCallback();
}
void DnsResolverPresentRoutine::FetchActiveNetworks() {
DCHECK(remote_cros_network_config_);
remote_cros_network_config_->GetNetworkStateList(
chromeos::network_config::mojom::NetworkFilter::New(
chromeos::network_config::mojom::FilterType::kActive,
chromeos::network_config::mojom::NetworkType::kAll,
chromeos::network_config::mojom::kNoLimit),
base::BindOnce(&DnsResolverPresentRoutine::OnNetworkStateListReceived,
base::Unretained(this)));
}
void DnsResolverPresentRoutine::FetchManagedProperties(
const std::string& guid) {
remote_cros_network_config_->GetManagedProperties(
guid,
base::BindOnce(&DnsResolverPresentRoutine::OnManagedPropertiesReceived,
base::Unretained(this)));
}
void DnsResolverPresentRoutine::OnManagedPropertiesReceived(
chromeos::network_config::mojom::ManagedPropertiesPtr managed_properties) {
if (!managed_properties || !managed_properties->ip_configs.has_value()) {
AnalyzeResultsAndExecuteCallback();
return;
}
for (const auto& ip_config : managed_properties->ip_configs.value()) {
if (ip_config->name_servers.has_value() &&
ip_config->name_servers->size() != 0) {
// Check that there are at least one set name server across the IPConfigs.
std::vector<std::string> non_empty_name_servers =
GetNonEmptyNameServers(ip_config->name_servers.value());
if (non_empty_name_servers.empty()) {
break;
}
name_servers_are_found_ = true;
// Check that the name servers are valid
if (NameServersHaveValidAddresses(non_empty_name_servers,
ip_config->type)) {
name_servers_are_valid_ = true;
break;
}
}
}
AnalyzeResultsAndExecuteCallback();
}
// Process the network interface information.
void DnsResolverPresentRoutine::OnNetworkStateListReceived(
std::vector<chromeos::network_config::mojom::NetworkStatePropertiesPtr>
networks) {
std::string default_guid;
for (const auto& network : networks) {
if (chromeos::network_config::StateIsConnected(network->connection_state)) {
default_guid = network->guid;
break;
}
}
// Since we are not connected, proceed to analyzing the results and executing
// the completion callback.
if (default_guid.empty()) {
AnalyzeResultsAndExecuteCallback();
} else {
connected_network_ = true;
FetchManagedProperties(default_guid);
}
}
} // namespace network_diagnostics
} // namespace ash
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