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/*
* This file is part of OpenTTD.
* 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.
* 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.
* 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/>.
*/
/** @file host.cpp Functions related to getting host specific data (IPs). */
#include "../../stdafx.h"
#include "../../debug.h"
#include "address.h"
#include "../../safeguards.h"
/**
* Internal implementation for finding the broadcast IPs.
* This function is implemented multiple times for multiple targets.
* @param broadcast the list of broadcasts to write into.
*/
static void NetworkFindBroadcastIPsInternal(NetworkAddressList *broadcast);
#if defined(HAVE_GETIFADDRS)
static void NetworkFindBroadcastIPsInternal(NetworkAddressList *broadcast) // GETIFADDRS implementation
{
struct ifaddrs *ifap, *ifa;
if (getifaddrs(&ifap) != 0) return;
for (ifa = ifap; ifa != nullptr; ifa = ifa->ifa_next) {
if (!(ifa->ifa_flags & IFF_BROADCAST)) continue;
if (ifa->ifa_broadaddr == nullptr) continue;
if (ifa->ifa_broadaddr->sa_family != AF_INET) continue;
NetworkAddress addr(ifa->ifa_broadaddr, sizeof(sockaddr));
if (std::none_of(broadcast->begin(), broadcast->end(), [&addr](NetworkAddress const& elem) -> bool { return elem == addr; })) broadcast->push_back(addr);
}
freeifaddrs(ifap);
}
#elif defined(_WIN32)
static void NetworkFindBroadcastIPsInternal(NetworkAddressList *broadcast) // Win32 implementation
{
SOCKET sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock == INVALID_SOCKET) return;
DWORD len = 0;
int num = 2;
INTERFACE_INFO *ifo = CallocT<INTERFACE_INFO>(num);
for (;;) {
if (WSAIoctl(sock, SIO_GET_INTERFACE_LIST, nullptr, 0, ifo, num * sizeof(*ifo), &len, nullptr, nullptr) == 0) break;
free(ifo);
if (WSAGetLastError() != WSAEFAULT) {
closesocket(sock);
return;
}
num *= 2;
ifo = CallocT<INTERFACE_INFO>(num);
}
for (uint j = 0; j < len / sizeof(*ifo); j++) {
if (ifo[j].iiFlags & IFF_LOOPBACK) continue;
if (!(ifo[j].iiFlags & IFF_BROADCAST)) continue;
sockaddr_storage address;
memset(&address, 0, sizeof(address));
/* iiBroadcast is unusable, because it always seems to be set to 255.255.255.255. */
memcpy(&address, &ifo[j].iiAddress.Address, sizeof(sockaddr));
((sockaddr_in*)&address)->sin_addr.s_addr = ifo[j].iiAddress.AddressIn.sin_addr.s_addr | ~ifo[j].iiNetmask.AddressIn.sin_addr.s_addr;
NetworkAddress addr(address, sizeof(sockaddr));
if (std::none_of(broadcast->begin(), broadcast->end(), [&addr](NetworkAddress const& elem) -> bool { return elem == addr; })) broadcast->push_back(addr);
}
free(ifo);
closesocket(sock);
}
#else /* not HAVE_GETIFADDRS */
#include "../../string_func.h"
static void NetworkFindBroadcastIPsInternal(NetworkAddressList *broadcast) // !GETIFADDRS implementation
{
SOCKET sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock == INVALID_SOCKET) return;
char buf[4 * 1024]; // Arbitrary buffer size
struct ifconf ifconf;
ifconf.ifc_len = sizeof(buf);
ifconf.ifc_buf = buf;
if (ioctl(sock, SIOCGIFCONF, &ifconf) == -1) {
closesocket(sock);
return;
}
const char *buf_end = buf + ifconf.ifc_len;
for (const char *p = buf; p < buf_end;) {
const struct ifreq *req = (const struct ifreq*)p;
if (req->ifr_addr.sa_family == AF_INET) {
struct ifreq r;
strecpy(r.ifr_name, req->ifr_name, lastof(r.ifr_name));
if (ioctl(sock, SIOCGIFFLAGS, &r) != -1 &&
(r.ifr_flags & IFF_BROADCAST) &&
ioctl(sock, SIOCGIFBRDADDR, &r) != -1) {
NetworkAddress addr(&r.ifr_broadaddr, sizeof(sockaddr));
if (std::none_of(broadcast->begin(), broadcast->end(), [&addr](NetworkAddress const& elem) -> bool { return elem == addr; })) broadcast->push_back(addr);
}
}
p += sizeof(struct ifreq);
#if defined(AF_LINK) && !defined(SUNOS)
p += req->ifr_addr.sa_len - sizeof(struct sockaddr);
#endif
}
closesocket(sock);
}
#endif /* all NetworkFindBroadcastIPsInternals */
/**
* Find the IPv4 broadcast addresses; IPv6 uses a completely different
* strategy for broadcasting.
* @param broadcast the list of broadcasts to write into.
*/
void NetworkFindBroadcastIPs(NetworkAddressList *broadcast)
{
NetworkFindBroadcastIPsInternal(broadcast);
/* Now display to the debug all the detected ips */
Debug(net, 3, "Detected broadcast addresses:");
int i = 0;
for (NetworkAddress &addr : *broadcast) {
addr.SetPort(NETWORK_DEFAULT_PORT);
Debug(net, 3, " {}) {}", i++, addr.GetHostname());
}
}
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