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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_UTIL_H_
#define NET_DNS_DNS_UTIL_H_
#include <string>
#include "base/strings/string_piece.h"
#include "base/time/time.h"
#include "net/base/net_export.h"
#include "net/base/network_change_notifier.h"
namespace net {
class AddressList;
// DNSDomainFromDot - convert a domain string to DNS format. From DJB's
// public domain DNS library.
//
// dotted: a string in dotted form: "www.google.com"
// out: a result in DNS form: "\x03www\x06google\x03com\x00"
NET_EXPORT_PRIVATE bool DNSDomainFromDot(const base::StringPiece& dotted,
std::string* out);
// Checks that a hostname is valid. Simple wrapper around DNSDomainFromDot.
NET_EXPORT_PRIVATE bool IsValidDNSDomain(const base::StringPiece& dotted);
// Returns true if the character is valid in a DNS hostname label, whether in
// the first position or later in the label.
//
// This function asserts a looser form of the restrictions in RFC 7719 (section
// 2; https://tools.ietf.org/html/rfc7719#section-2): hostnames can include
// characters a-z, A-Z, 0-9, -, and _, and any of those characters (except -)
// are legal in the first position. The looser rules are necessary to support
// service records (initial _), and non-compliant but attested hostnames that
// include _. These looser rules also allow Punycode and hence IDN.
//
// TODO(palmer): In the future, when we can remove support for invalid names,
// this can be a private implementation detail of |DNSDomainFromDot|, and need
// not be NET_EXPORT_PRIVATE.
NET_EXPORT_PRIVATE bool IsValidHostLabelCharacter(char c, bool is_first_char);
// DNSDomainToString converts a domain in DNS format to a dotted string.
// Excludes the dot at the end.
NET_EXPORT_PRIVATE std::string DNSDomainToString(
const base::StringPiece& domain);
#if !defined(OS_NACL)
NET_EXPORT_PRIVATE
base::TimeDelta GetTimeDeltaForConnectionTypeFromFieldTrialOrDefault(
const char* field_trial_name,
base::TimeDelta default_delta,
NetworkChangeNotifier::ConnectionType connection_type);
#endif // !defined(OS_NACL)
// How similar or different two AddressLists are (see values for details).
// Used in histograms; do not modify existing values.
enum AddressListDeltaType {
// Both lists contain the same addresses in the same order.
DELTA_IDENTICAL = 0,
// Both lists contain the same addresses in a different order.
DELTA_REORDERED = 1,
// The two lists have at least one address in common, but not all of them.
DELTA_OVERLAP = 2,
// The two lists have no addresses in common.
DELTA_DISJOINT = 3,
MAX_DELTA_TYPE
};
// Compares two AddressLists to see how similar or different their addresses
// are. (See |AddressListDeltaType| for details of exactly what's checked.)
AddressListDeltaType FindAddressListDeltaType(const AddressList& a,
const AddressList& b);
} // namespace net
#endif // NET_DNS_DNS_UTIL_H_
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