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80 lines
3.0 KiB
C
80 lines
3.0 KiB
C
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_DNS_DNS_UTIL_H_
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#define NET_DNS_DNS_UTIL_H_
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#include <string>
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#include "base/strings/string_piece.h"
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#include "base/time/time.h"
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#include "net/base/net_export.h"
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#include "net/base/network_change_notifier.h"
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namespace net {
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class AddressList;
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// DNSDomainFromDot - convert a domain string to DNS format. From DJB's
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// public domain DNS library.
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//
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// dotted: a string in dotted form: "www.google.com"
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// out: a result in DNS form: "\x03www\x06google\x03com\x00"
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NET_EXPORT_PRIVATE bool DNSDomainFromDot(const base::StringPiece& dotted,
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std::string* out);
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// Checks that a hostname is valid. Simple wrapper around DNSDomainFromDot.
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NET_EXPORT_PRIVATE bool IsValidDNSDomain(const base::StringPiece& dotted);
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// Returns true if the character is valid in a DNS hostname label, whether in
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// the first position or later in the label.
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//
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// This function asserts a looser form of the restrictions in RFC 7719 (section
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// 2; https://tools.ietf.org/html/rfc7719#section-2): hostnames can include
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// characters a-z, A-Z, 0-9, -, and _, and any of those characters (except -)
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// are legal in the first position. The looser rules are necessary to support
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// service records (initial _), and non-compliant but attested hostnames that
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// include _. These looser rules also allow Punycode and hence IDN.
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//
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// TODO(palmer): In the future, when we can remove support for invalid names,
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// this can be a private implementation detail of |DNSDomainFromDot|, and need
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// not be NET_EXPORT_PRIVATE.
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NET_EXPORT_PRIVATE bool IsValidHostLabelCharacter(char c, bool is_first_char);
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// DNSDomainToString converts a domain in DNS format to a dotted string.
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// Excludes the dot at the end.
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NET_EXPORT_PRIVATE std::string DNSDomainToString(
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const base::StringPiece& domain);
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#if !defined(OS_NACL)
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NET_EXPORT_PRIVATE
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base::TimeDelta GetTimeDeltaForConnectionTypeFromFieldTrialOrDefault(
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const char* field_trial_name,
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base::TimeDelta default_delta,
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NetworkChangeNotifier::ConnectionType connection_type);
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#endif // !defined(OS_NACL)
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// How similar or different two AddressLists are (see values for details).
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// Used in histograms; do not modify existing values.
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enum AddressListDeltaType {
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// Both lists contain the same addresses in the same order.
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DELTA_IDENTICAL = 0,
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// Both lists contain the same addresses in a different order.
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DELTA_REORDERED = 1,
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// The two lists have at least one address in common, but not all of them.
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DELTA_OVERLAP = 2,
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// The two lists have no addresses in common.
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DELTA_DISJOINT = 3,
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MAX_DELTA_TYPE
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};
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// Compares two AddressLists to see how similar or different their addresses
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// are. (See |AddressListDeltaType| for details of exactly what's checked.)
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AddressListDeltaType FindAddressListDeltaType(const AddressList& a,
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const AddressList& b);
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} // namespace net
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#endif // NET_DNS_DNS_UTIL_H_
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