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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/ash/components/network/network_config.h"
#include <memory>
#include <string>
#include <string_view>
#include <vector>
#include "base/values.h"
#include "chromeos/ash/components/network/network_event_log.h"
#include "net/base/ip_address.h"
#include "third_party/cros_system_api/dbus/shill/dbus-constants.h"
namespace ash {
namespace {
std::optional<NetworkConfig::IPCIDR> ParseCIDR(std::string_view key,
const base::Value& val) {
if (!val.is_string()) {
NET_LOG(ERROR) << "Failed to parse " << key << " not a string";
return std::nullopt;
}
const std::string& str = val.GetString();
if (str.empty()) {
return std::nullopt;
}
NetworkConfig::IPCIDR ret;
size_t prefix_len;
if (!net::ParseCIDRBlock(str, &ret.addr, &prefix_len)) {
NET_LOG(ERROR) << "Failed to parse " << key << " with value " << val;
return std::nullopt;
}
ret.prefix_len = static_cast<int>(prefix_len);
return ret;
}
std::optional<net::IPAddress> ParseIPAddress(std::string_view key,
const base::Value& val) {
if (!val.is_string()) {
NET_LOG(ERROR) << "Failed to parse " << key << " not a string";
return std::nullopt;
}
const std::string& str = val.GetString();
if (str.empty()) {
return std::nullopt;
}
auto ret = net::IPAddress::FromIPLiteral(str);
if (!ret) {
NET_LOG(ERROR) << "Failed to parse " << key << " with value " << str;
}
return ret;
}
} // namespace
std::unique_ptr<NetworkConfig> NetworkConfig::ParseFromServicePropertyValue(
const base::Value& value) {
const base::Value::Dict* dict = value.GetIfDict();
if (!dict || dict->empty()) {
return nullptr;
}
auto network_config = std::make_unique<NetworkConfig>();
// IPv4 address and gateway.
if (const auto* ipv4_address =
dict->Find(shill::kNetworkConfigIPv4AddressProperty)) {
network_config->ipv4_address =
ParseCIDR(shill::kNetworkConfigIPv4AddressProperty, *ipv4_address);
}
if (const auto* ipv4_gateway =
dict->Find(shill::kNetworkConfigIPv4GatewayProperty)) {
network_config->ipv4_gateway =
ParseIPAddress(shill::kNetworkConfigIPv4GatewayProperty, *ipv4_gateway);
}
// IPv6 addresses and gateway.
if (const auto* ipv6_addresses =
dict->FindList(shill::kNetworkConfigIPv6AddressesProperty)) {
for (const base::Value& item : *ipv6_addresses) {
std::optional<NetworkConfig::IPCIDR> cidr =
ParseCIDR(shill::kNetworkConfigIPv6AddressesProperty, item);
if (cidr) {
network_config->ipv6_addresses.push_back(*cidr);
}
}
}
if (const auto* ipv6_gateway =
dict->Find(shill::kNetworkConfigIPv6GatewayProperty)) {
network_config->ipv6_gateway =
ParseIPAddress(shill::kNetworkConfigIPv6GatewayProperty, *ipv6_gateway);
}
// DNS and domain searches.
if (const auto* dns_list =
dict->FindList(shill::kNetworkConfigNameServersProperty)) {
for (const base::Value& dns_value : *dns_list) {
std::optional<net::IPAddress> name_server =
ParseIPAddress(shill::kNetworkConfigNameServersProperty, dns_value);
// When manually setting DNS, up to 4 addresses can be specified in the
// UI. Unspecified entries can show up as 0.0.0.0 and should be removed.
if (name_server && !name_server->IsZero()) {
network_config->dns_servers.push_back(*name_server);
}
}
}
if (const auto* domains =
dict->FindList(shill::kNetworkConfigSearchDomainsProperty)) {
for (const auto& domain : *domains) {
network_config->search_domains.push_back(domain.GetString());
}
}
// Included routes and excluded routes.
if (const auto* include_routes_list =
dict->FindList(shill::kNetworkConfigIncludedRoutesProperty)) {
for (const base::Value& item : *include_routes_list) {
std::optional<NetworkConfig::IPCIDR> cidr =
ParseCIDR(shill::kNetworkConfigIncludedRoutesProperty, item);
if (cidr) {
network_config->included_routes.push_back(*cidr);
}
}
}
if (const auto* exclude_routes_list =
dict->FindList(shill::kNetworkConfigExcludedRoutesProperty)) {
for (const base::Value& item : *exclude_routes_list) {
std::optional<NetworkConfig::IPCIDR> cidr =
ParseCIDR(shill::kNetworkConfigExcludedRoutesProperty, item);
if (cidr) {
network_config->excluded_routes.push_back(*cidr);
}
}
}
// MTU.
if (int mtu = dict->FindInt(shill::kNetworkConfigMTUProperty).value_or(0);
mtu > 0) {
network_config->mtu = mtu;
}
return network_config;
}
NetworkConfig::NetworkConfig() = default;
NetworkConfig::~NetworkConfig() = default;
} // namespace ash
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