135 lines
4.7 KiB
C++
135 lines
4.7 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "DnsTlsServer.h"
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#include <algorithm>
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#include <netdutils/InternetAddresses.h>
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namespace {
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// Returns a tuple of references to the elements of a.
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auto make_tie(const sockaddr_in& a) {
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return std::tie(a.sin_port, a.sin_addr.s_addr);
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}
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// Returns a tuple of references to the elements of a.
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auto make_tie(const sockaddr_in6& a) {
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// Skip flowinfo, which is not relevant.
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return std::tie(
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a.sin6_port,
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a.sin6_addr,
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a.sin6_scope_id
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);
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}
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} // namespace
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// These binary operators make sockaddr_storage comparable. They need to be
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// in the global namespace so that the std::tuple < and == operators can see them.
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static bool operator <(const in6_addr& x, const in6_addr& y) {
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return std::lexicographical_compare(
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std::begin(x.s6_addr), std::end(x.s6_addr),
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std::begin(y.s6_addr), std::end(y.s6_addr));
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}
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static bool operator ==(const in6_addr& x, const in6_addr& y) {
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return std::equal(
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std::begin(x.s6_addr), std::end(x.s6_addr),
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std::begin(y.s6_addr), std::end(y.s6_addr));
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}
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static bool operator <(const sockaddr_storage& x, const sockaddr_storage& y) {
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if (x.ss_family != y.ss_family) {
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return x.ss_family < y.ss_family;
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}
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// Same address family.
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if (x.ss_family == AF_INET) {
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const sockaddr_in& x_sin = reinterpret_cast<const sockaddr_in&>(x);
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const sockaddr_in& y_sin = reinterpret_cast<const sockaddr_in&>(y);
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return make_tie(x_sin) < make_tie(y_sin);
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} else if (x.ss_family == AF_INET6) {
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const sockaddr_in6& x_sin6 = reinterpret_cast<const sockaddr_in6&>(x);
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const sockaddr_in6& y_sin6 = reinterpret_cast<const sockaddr_in6&>(y);
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return make_tie(x_sin6) < make_tie(y_sin6);
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}
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return false; // Unknown address type. This is an error.
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}
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static bool operator ==(const sockaddr_storage& x, const sockaddr_storage& y) {
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if (x.ss_family != y.ss_family) {
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return false;
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}
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// Same address family.
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if (x.ss_family == AF_INET) {
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const sockaddr_in& x_sin = reinterpret_cast<const sockaddr_in&>(x);
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const sockaddr_in& y_sin = reinterpret_cast<const sockaddr_in&>(y);
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return make_tie(x_sin) == make_tie(y_sin);
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} else if (x.ss_family == AF_INET6) {
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const sockaddr_in6& x_sin6 = reinterpret_cast<const sockaddr_in6&>(x);
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const sockaddr_in6& y_sin6 = reinterpret_cast<const sockaddr_in6&>(y);
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return make_tie(x_sin6) == make_tie(y_sin6);
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}
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return false; // Unknown address type. This is an error.
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}
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namespace android {
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namespace net {
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// This comparison ignores ports and certificates.
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bool AddressComparator::operator() (const DnsTlsServer& x, const DnsTlsServer& y) const {
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if (x.ss.ss_family != y.ss.ss_family) {
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return x.ss.ss_family < y.ss.ss_family;
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}
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// Same address family.
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if (x.ss.ss_family == AF_INET) {
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const sockaddr_in& x_sin = reinterpret_cast<const sockaddr_in&>(x.ss);
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const sockaddr_in& y_sin = reinterpret_cast<const sockaddr_in&>(y.ss);
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return x_sin.sin_addr.s_addr < y_sin.sin_addr.s_addr;
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} else if (x.ss.ss_family == AF_INET6) {
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const sockaddr_in6& x_sin6 = reinterpret_cast<const sockaddr_in6&>(x.ss);
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const sockaddr_in6& y_sin6 = reinterpret_cast<const sockaddr_in6&>(y.ss);
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return std::tie(x_sin6.sin6_addr, x_sin6.sin6_scope_id) <
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std::tie(y_sin6.sin6_addr, y_sin6.sin6_scope_id);
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}
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return false; // Unknown address type. This is an error.
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}
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// Returns a tuple of references to the elements of s.
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auto make_tie(const DnsTlsServer& s) {
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return std::tie(s.ss, s.name, s.protocol);
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}
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bool DnsTlsServer::operator <(const DnsTlsServer& other) const {
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return make_tie(*this) < make_tie(other);
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}
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bool DnsTlsServer::operator ==(const DnsTlsServer& other) const {
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return make_tie(*this) == make_tie(other);
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}
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bool DnsTlsServer::wasExplicitlyConfigured() const {
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return !name.empty();
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}
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std::string DnsTlsServer::toIpString() const {
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return netdutils::IPSockAddr::toIPSockAddr(ss).ip().toString();
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}
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} // namespace net
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} // namespace android
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