74 lines
2 KiB
C++
Executable file
74 lines
2 KiB
C++
Executable file
// Copyright (c) 2011-2016 The Cryptonote developers
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// Distributed under the MIT/X11 software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include "Ipv4Resolver.h"
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#include <cassert>
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#include <random>
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#include <stdexcept>
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#include <netdb.h>
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#include <System/Dispatcher.h>
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#include <System/ErrorMessage.h>
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#include <System/InterruptedException.h>
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#include <System/Ipv4Address.h>
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namespace System {
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Ipv4Resolver::Ipv4Resolver() : dispatcher(nullptr) {
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}
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Ipv4Resolver::Ipv4Resolver(Dispatcher& dispatcher) : dispatcher(&dispatcher) {
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}
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Ipv4Resolver::Ipv4Resolver(Ipv4Resolver&& other) : dispatcher(other.dispatcher) {
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if (dispatcher != nullptr) {
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other.dispatcher = nullptr;
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}
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}
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Ipv4Resolver::~Ipv4Resolver() {
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}
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Ipv4Resolver& Ipv4Resolver::operator=(Ipv4Resolver&& other) {
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dispatcher = other.dispatcher;
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if (dispatcher != nullptr) {
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other.dispatcher = nullptr;
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}
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return *this;
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}
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Ipv4Address Ipv4Resolver::resolve(const std::string& host) {
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assert(dispatcher != nullptr);
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if (dispatcher->interrupted()) {
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throw InterruptedException();
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}
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addrinfo hints = { 0, AF_INET, SOCK_STREAM, IPPROTO_TCP, 0, NULL, NULL, NULL };
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addrinfo* addressInfos;
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int result = getaddrinfo(host.c_str(), NULL, &hints, &addressInfos);
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if (result != 0) {
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throw std::runtime_error("Ipv4Resolver::resolve, getaddrinfo failed, " + errorMessage(result));
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}
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std::size_t count = 0;
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for (addrinfo* addressInfo = addressInfos; addressInfo != nullptr; addressInfo = addressInfo->ai_next) {
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++count;
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}
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std::mt19937 generator{ std::random_device()() };
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std::size_t index = std::uniform_int_distribution<std::size_t>(0, count - 1)(generator);
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addrinfo* addressInfo = addressInfos;
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for (std::size_t i = 0; i < index; ++i) {
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addressInfo = addressInfo->ai_next;
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}
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Ipv4Address address(ntohl(reinterpret_cast<sockaddr_in*>(addressInfo->ai_addr)->sin_addr.s_addr));
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freeaddrinfo(addressInfo);
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return address;
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}
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}
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