mirror of
https://github.com/OpenTTD/OpenTTD.git
synced 2025-07-22 20:05:40 +01:00
97 lines
3.5 KiB
C++
97 lines
3.5 KiB
C++
/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file host.cpp Functions related to getting host specific data (IPs). */
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#include "../../stdafx.h"
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#include "../../debug.h"
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#include "../../core/alloc_func.hpp"
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#include "address.h"
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#include "../../safeguards.h"
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/**
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* Internal implementation for finding the broadcast IPs.
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* This function is implemented multiple times for multiple targets.
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* @param broadcast the list of broadcasts to write into.
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*/
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static void NetworkFindBroadcastIPsInternal(NetworkAddressList *broadcast);
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#ifdef _WIN32
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static void NetworkFindBroadcastIPsInternal(NetworkAddressList *broadcast) // Win32 implementation
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{
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SOCKET sock = socket(AF_INET, SOCK_DGRAM, 0);
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if (sock == INVALID_SOCKET) return;
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std::vector<INTERFACE_INFO> ifos;
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ifos.resize(2);
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for (;;) {
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DWORD len = 0;
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if (WSAIoctl(sock, SIO_GET_INTERFACE_LIST, nullptr, 0, ifos.data(), static_cast<DWORD>(ifos.size() * sizeof(INTERFACE_INFO)), &len, nullptr, nullptr) == 0) {
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ifos.resize(len / sizeof(INTERFACE_INFO));
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break;
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}
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if (WSAGetLastError() != WSAEFAULT) {
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closesocket(sock);
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return;
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}
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ifos.resize(ifos.size() * 2);
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}
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for (auto &ifo : ifos) {
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if (ifo.iiFlags & IFF_LOOPBACK) continue;
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if (!(ifo.iiFlags & IFF_BROADCAST)) continue;
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sockaddr_storage address{};
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/* iiBroadcast is unusable, because it always seems to be set to 255.255.255.255. */
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memcpy(&address, &ifo.iiAddress.Address, sizeof(sockaddr));
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reinterpret_cast<sockaddr_in*>(&address)->sin_addr.s_addr = ifo.iiAddress.AddressIn.sin_addr.s_addr | ~ifo.iiNetmask.AddressIn.sin_addr.s_addr;
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NetworkAddress addr(address, sizeof(sockaddr));
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if (std::none_of(broadcast->begin(), broadcast->end(), [&addr](NetworkAddress const &elem) -> bool { return elem == addr; })) broadcast->push_back(addr);
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}
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closesocket(sock);
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}
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#else /* not WIN32 */
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static void NetworkFindBroadcastIPsInternal(NetworkAddressList *broadcast)
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{
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struct ifaddrs *ifap, *ifa;
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if (getifaddrs(&ifap) != 0) return;
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for (ifa = ifap; ifa != nullptr; ifa = ifa->ifa_next) {
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if (!(ifa->ifa_flags & IFF_BROADCAST)) continue;
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if (ifa->ifa_broadaddr == nullptr) continue;
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if (ifa->ifa_broadaddr->sa_family != AF_INET) continue;
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NetworkAddress addr(ifa->ifa_broadaddr, sizeof(sockaddr));
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if (std::none_of(broadcast->begin(), broadcast->end(), [&addr](NetworkAddress const &elem) -> bool { return elem == addr; })) broadcast->push_back(addr);
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}
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freeifaddrs(ifap);
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}
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#endif /* all NetworkFindBroadcastIPsInternals */
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/**
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* Find the IPv4 broadcast addresses; IPv6 uses a completely different
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* strategy for broadcasting.
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* @param broadcast the list of broadcasts to write into.
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*/
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void NetworkFindBroadcastIPs(NetworkAddressList *broadcast)
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{
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NetworkFindBroadcastIPsInternal(broadcast);
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/* Now display to the debug all the detected ips */
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Debug(net, 3, "Detected broadcast addresses:");
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int i = 0;
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for (NetworkAddress &addr : *broadcast) {
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addr.SetPort(NETWORK_DEFAULT_PORT);
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Debug(net, 3, " {}) {}", i++, addr.GetHostname());
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}
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}
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