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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_DNS_DNS_CONFIG_SERVICE_POSIX_H_
#define NET_DNS_DNS_CONFIG_SERVICE_POSIX_H_
#if !defined(OS_ANDROID)
#include <sys/types.h>
#include <netinet/in.h>
#include <resolv.h>
#endif
#include "base/compiler_specific.h"
#include "base/files/file_path.h"
#include "net/base/net_export.h"
#include "net/base/network_change_notifier.h"
#include "net/dns/dns_config_service.h"
namespace base {
class Time;
} // namespace base
namespace net {
// Use DnsConfigService::CreateSystemService to use it outside of tests.
namespace internal {
// Note: On Android NetworkChangeNotifier::OnNetworkChanged() signals must be
// passed in via calls to OnNetworkChanged().
class NET_EXPORT_PRIVATE DnsConfigServicePosix : public DnsConfigService {
public:
DnsConfigServicePosix();
~DnsConfigServicePosix() override;
#if defined(OS_ANDROID)
// Returns whether the DnsConfigServicePosix witnessed a DNS configuration
// change since |since_time|. Requires that callers have started listening
// for NetworkChangeNotifier::OnNetworkChanged() signals, and passing them in
// via OnNetworkChanged(), prior to |since_time|.
bool SeenChangeSince(const base::Time& since_time) const;
// NetworkChangeNotifier::OnNetworkChanged() signals must be passed
// in via calls to OnNetworkChanged(). Allowing external sources of
// this signal allows users of DnsConfigServicePosix to start watching for
// NetworkChangeNotifier::OnNetworkChanged() signals prior to the
// DnsConfigServicePosix even being created.
void OnNetworkChanged(NetworkChangeNotifier::ConnectionType type);
#endif
void SetDnsConfigForTesting(const DnsConfig* dns_config);
protected:
// DnsConfigService:
void ReadNow() override;
bool StartWatching() override;
private:
friend class DnsConfigServicePosixTest;
class Watcher;
class ConfigReader;
class HostsReader;
void OnConfigChanged(bool succeeded);
void OnHostsChanged(bool succeeded);
scoped_ptr<Watcher> watcher_;
// Allow a mock hosts file for testing purposes.
const base::FilePath::CharType* file_path_hosts_;
// Allow a mock DNS server for testing purposes.
const DnsConfig* dns_config_for_testing_;
scoped_refptr<ConfigReader> config_reader_;
scoped_refptr<HostsReader> hosts_reader_;
#if defined(OS_ANDROID)
// Has DnsConfigWatcher detected any config changes yet?
bool seen_config_change_;
#endif
DISALLOW_COPY_AND_ASSIGN(DnsConfigServicePosix);
};
enum ConfigParsePosixResult {
CONFIG_PARSE_POSIX_OK = 0,
CONFIG_PARSE_POSIX_RES_INIT_FAILED,
CONFIG_PARSE_POSIX_RES_INIT_UNSET,
CONFIG_PARSE_POSIX_BAD_ADDRESS,
CONFIG_PARSE_POSIX_BAD_EXT_STRUCT,
CONFIG_PARSE_POSIX_NULL_ADDRESS,
CONFIG_PARSE_POSIX_NO_NAMESERVERS,
CONFIG_PARSE_POSIX_MISSING_OPTIONS,
CONFIG_PARSE_POSIX_UNHANDLED_OPTIONS,
CONFIG_PARSE_POSIX_NO_DNSINFO,
CONFIG_PARSE_POSIX_MAX // Bounding values for enumeration.
};
#if !defined(OS_ANDROID)
// Fills in |dns_config| from |res|.
ConfigParsePosixResult NET_EXPORT_PRIVATE ConvertResStateToDnsConfig(
const struct __res_state& res, DnsConfig* dns_config);
#endif
} // namespace internal
} // namespace net
#endif // NET_DNS_DNS_CONFIG_SERVICE_POSIX_H_
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