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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_H_
#define NET_DNS_DNS_CONFIG_SERVICE_H_
#pragma once
#include <map>
#include <string>
#include <vector>
#include "base/gtest_prod_util.h"
#include "base/memory/scoped_ptr.h"
#include "base/threading/non_thread_safe.h"
#include "base/time.h"
#include "base/timer.h"
#include "net/base/ip_endpoint.h" // win requires size of IPEndPoint
#include "net/base/net_export.h"
#include "net/dns/dns_hosts.h"
namespace net {
// DnsConfig stores configuration of the system resolver.
struct NET_EXPORT_PRIVATE DnsConfig {
DnsConfig();
virtual ~DnsConfig();
bool Equals(const DnsConfig& d) const;
bool EqualsIgnoreHosts(const DnsConfig& d) const;
void CopyIgnoreHosts(const DnsConfig& src);
bool IsValid() const {
return !nameservers.empty();
}
// List of name server addresses.
std::vector<IPEndPoint> nameservers;
// Suffix search list; used on first lookup when number of dots in given name
// is less than |ndots|.
std::vector<std::string> search;
DnsHosts hosts;
// AppendToMultiLabelName: is suffix search performed for multi-label names?
// True, except on Windows where it can be configured.
bool append_to_multi_label_name;
// Resolver options; see man resolv.conf.
// Minimum number of dots before global resolution precedes |search|.
int ndots;
// Time between retransmissions, see res_state.retrans.
base::TimeDelta timeout;
// Maximum number of attempts, see res_state.retry.
int attempts;
// Round robin entries in |nameservers| for subsequent requests.
bool rotate;
// Enable EDNS0 extensions.
bool edns0;
};
// Service for watching when the system DNS settings have changed.
// Depending on the platform, watches files in /etc/ or Windows registry.
class NET_EXPORT_PRIVATE DnsConfigService
: NON_EXPORTED_BASE(public base::NonThreadSafe) {
public:
// Callback interface for the client. The observer is called on the same
// thread as Watch(). Observer must outlive the service.
typedef base::Callback<void(const DnsConfig& config)> CallbackType;
// Creates the platform-specific DnsConfigService.
static scoped_ptr<DnsConfigService> CreateSystemService();
DnsConfigService();
virtual ~DnsConfigService();
// Immediately starts watching system configuration for changes and attempts
// to read the configuration. For some platform implementations, the current
// thread must have an IO loop (for base::files::FilePathWatcher).
virtual void Watch(const CallbackType& callback) = 0;
protected:
friend class DnsHostsReader;
// Called when the current config (except hosts) has changed.
void InvalidateConfig();
// Called when the current hosts have changed.
void InvalidateHosts();
// Called with new config. |config|.hosts is ignored.
void OnConfigRead(const DnsConfig& config);
// Called with new hosts. Rest of the config is assumed unchanged.
void OnHostsRead(const DnsHosts& hosts);
void set_callback(const CallbackType& callback) {
callback_ = callback;
}
private:
void StartTimer();
// Called when the timer expires.
void OnTimeout();
// Called when the config becomes complete.
void OnCompleteConfig();
CallbackType callback_;
DnsConfig dns_config_;
// True after On*Read, before Invalidate*. Tell if the config is complete.
bool have_config_;
bool have_hosts_;
// True if receiver needs to be updated when the config becomes complete.
bool need_update_;
// Started in Invalidate*, cleared in On*Read.
base::OneShotTimer<DnsConfigService> timer_;
private:
DISALLOW_COPY_AND_ASSIGN(DnsConfigService);
};
} // namespace net
#endif // NET_DNS_DNS_CONFIG_SERVICE_H_
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