/*
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* Copyright (C) 2018 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 "netdutils/InternetAddresses.h"
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#include <android-base/stringprintf.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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namespace android {
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using base::StringPrintf;
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namespace netdutils {
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std::string IPAddress::toString() const noexcept {
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char repr[INET6_ADDRSTRLEN] = "\0";
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switch (mData.family) {
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case AF_UNSPEC:
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return "<unspecified>";
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case AF_INET: {
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const in_addr v4 = mData.ip.v4;
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inet_ntop(AF_INET, &v4, repr, sizeof(repr));
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break;
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}
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case AF_INET6: {
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const in6_addr v6 = mData.ip.v6;
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inet_ntop(AF_INET6, &v6, repr, sizeof(repr));
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break;
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}
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default:
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return "<unknown_family>";
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}
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if (mData.family == AF_INET6 && mData.scope_id > 0) {
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return StringPrintf("%s%%%u", repr, mData.scope_id);
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}
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return repr;
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}
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bool IPAddress::forString(const std::string& repr, IPAddress* ip) {
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const addrinfo hints = {
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.ai_flags = AI_NUMERICHOST | AI_NUMERICSERV,
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};
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addrinfo* res;
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const int ret = getaddrinfo(repr.c_str(), nullptr, &hints, &res);
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// TODO: move ScopedAddrinfo into libnetdutils and use it here.
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if (ret != 0) {
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freeaddrinfo(res);
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return false;
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}
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bool rval = true;
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switch (res[0].ai_family) {
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case AF_INET: {
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sockaddr_in* sin = (sockaddr_in*) res[0].ai_addr;
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if (ip) *ip = IPAddress(sin->sin_addr);
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break;
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}
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case AF_INET6: {
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sockaddr_in6* sin6 = (sockaddr_in6*) res[0].ai_addr;
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if (ip) *ip = IPAddress(sin6->sin6_addr, sin6->sin6_scope_id);
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break;
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}
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default:
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rval = false;
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break;
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}
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freeaddrinfo(res);
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return rval;
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}
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IPPrefix::IPPrefix(const IPAddress& ip, int length) : IPPrefix(ip) {
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// Silently treat CIDR lengths like "-1" as meaning the full bit length
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// appropriate to the address family.
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if (length < 0) return;
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if (length >= mData.cidrlen) return;
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switch (mData.family) {
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case AF_UNSPEC:
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break;
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case AF_INET: {
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const in_addr_t mask = (length > 0) ? (~0U) << (IPV4_ADDR_BITS - length) : 0U;
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mData.ip.v4.s_addr &= htonl(mask);
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mData.cidrlen = static_cast<uint8_t>(length);
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break;
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}
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case AF_INET6: {
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// The byte in which this CIDR length falls.
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const int which = length / 8;
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const int mask = (length % 8 == 0) ? 0 : 0xff << (8 - length % 8);
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mData.ip.v6.s6_addr[which] &= mask;
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for (int i = which + 1; i < IPV6_ADDR_LEN; i++) {
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mData.ip.v6.s6_addr[i] = 0U;
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}
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mData.cidrlen = static_cast<uint8_t>(length);
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break;
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}
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default:
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// TODO: Complain bitterly about possible data corruption?
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return;
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}
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}
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bool IPPrefix::isUninitialized() const noexcept {
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static const internal_::compact_ipdata empty{};
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return mData == empty;
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}
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std::string IPPrefix::toString() const noexcept {
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return StringPrintf("%s/%d", ip().toString().c_str(), mData.cidrlen);
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}
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std::string IPSockAddr::toString() const noexcept {
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switch (mData.family) {
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case AF_INET6:
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return StringPrintf("[%s]:%u", ip().toString().c_str(), mData.port);
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default:
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return StringPrintf("%s:%u", ip().toString().c_str(), mData.port);
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}
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}
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} // namespace netdutils
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} // namespace android
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