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#include "UnityPrefix.h"
#if ENABLE_SOCKETS
#include "MulticastSocket.h"
#include "SocketUtils.h"
#if UNITY_EDITOR && UNITY_OSX
#include <ifaddrs.h>
#include <net/if.h>
#endif
MulticastSocket::MulticastSocket()
: Socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)
, m_Bound(false)
{
SetReuseAddress(true);
#if UNITY_WINRT
m_initalised = false;
#endif
}
#if !UNITY_WINRT
bool MulticastSocket::Initialize(const char* group, unsigned short port, bool block)
{
if (!SetBlocking(block))
return false;
SetupAddress(inet_addr(group), htons(port), &m_MulticastAddress);
return true;
}
bool MulticastSocket::Join()
{
if (!m_Bound)
{
struct sockaddr_in listen_addr;
SetupAddress(htonl(INADDR_ANY), m_MulticastAddress.sin_port, &listen_addr);
if (CheckError(bind(m_SocketHandle, (struct sockaddr*) &listen_addr, sizeof(sockaddr_in)), "bind failed"))
return false;
m_Bound = true;
}
#if UNITY_EDITOR
// Join the multicast group on all valid network addresses, so that a lower value routing metric adapter doesn't
// override a higher value routing metric adapter from processing the message (e.g. Ethernet and Wifi); This is
// primarily needed to fix the Profiler being able to auto-discover available players
// NOTE: Simply because we are able to join a multicast group doesn't mean that the port isn't blocked by a firewall.
// A common issue among Windows machines is when a network is marked as "Public" and when Unity first ran the user
// disallowed traffic on Public networks to come through the firewall.
return SetOptionForAllAddresses(IP_ADD_MEMBERSHIP, "unable to join multicast group");
#else
struct ip_mreq mreq;
mreq.imr_multiaddr.s_addr = m_MulticastAddress.sin_addr.s_addr;
mreq.imr_interface.s_addr = htonl(INADDR_ANY);
return !CheckError(SetSocketOption(IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)), "unable to join multicast group");
#endif
}
bool MulticastSocket::Disband()
{
#if UNITY_EDITOR
return SetOptionForAllAddresses(IP_DROP_MEMBERSHIP, "unable to disband multicast group");
#else
struct ip_mreq mreq;
mreq.imr_multiaddr.s_addr = m_MulticastAddress.sin_addr.s_addr;
mreq.imr_interface.s_addr = htonl(INADDR_ANY);
return !CheckError(SetSocketOption(IPPROTO_IP, IP_DROP_MEMBERSHIP, &mreq, sizeof(mreq)), "unable to disband multicast group");
#endif
}
#if UNITY_EDITOR
bool MulticastSocket::SetOptionForAllAddresses(int option, const char* msg)
{
bool error = false;
// Windows doesn't have the getifaddrs call and OSX doesn't return all addresses with an empty
// string passed to getaddrinfo, so it is necessary to have two approaches.
#if UNITY_WIN
#define IFADDR_T ADDRINFOA
#define PIFADDR_T PADDRINFOA
#define GET_PSOCKADDR(i) i->ai_addr
#define GET_NEXT_IFADDR(i) i->ai_next
#define FREE_IFADDRS(i) freeaddrinfo(i);
// Set the filter to return network addresses that can handle multicast (udp)
IFADDR_T hints;
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_ADDRCONFIG;
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;
PIFADDR_T ifaddr = NULL;
// Empty string is sent to return all addresses registered to the local computer
getaddrinfo("", NULL, &hints, &ifaddr);
#else
#define IFADDR_T ifaddrs
#define PIFADDR_T ifaddrs*
#define GET_PSOCKADDR(i) i->ifa_addr
#define GET_NEXT_IFADDR(i) i->ifa_next
#define FREE_IFADDRS(i) freeifaddrs(i);
PIFADDR_T ifaddr = NULL;
if (getifaddrs(&ifaddr) != -1)
#endif
{
PIFADDR_T ifa = ifaddr;
while (ifa)
{
#if !UNITY_WIN
// We only care about IPv4 interfaces that support multicast
if (ifa->ifa_addr != NULL && ifa->ifa_addr->sa_family == AF_INET && (ifa->ifa_flags & IFF_MULTICAST) != 0)
#endif
{
sockaddr_in* addr = (sockaddr_in*)GET_PSOCKADDR(ifa);
//char* address = inet_ntoa(addr->sin_addr);
struct ip_mreq mreq;
mreq.imr_multiaddr= m_MulticastAddress.sin_addr;
mreq.imr_interface = addr->sin_addr;
error |= CheckError(SetSocketOption(IPPROTO_IP, option, &mreq, sizeof(mreq)), msg);
}
ifa = GET_NEXT_IFADDR(ifa);
}
}
FREE_IFADDRS(ifaddr);
#undef IFADDR_T
#undef PIFADDR_T
#undef GET_PSOCKADDR
#undef GET_NEXT_IFADDR
#undef FREE_IFADDRS
return !error;
}
#endif
bool MulticastSocket::SetTTL(unsigned char ttl)
{
#if UNITY_XENON
return false;
#else
return !CheckError(SetSocketOption(IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)), "failed to set TTL");
#endif
}
bool MulticastSocket::SetLoop(bool loop)
{
#if UNITY_XENON
return false;
#else
return !CheckError(SetSocketOption(IPPROTO_IP, IP_MULTICAST_LOOP, loop), "failed to set loop mode");
#endif
}
bool MulticastSocket::SetBroadcast(bool broadcast)
{
return !CheckError(SetSocketOption(SOL_SOCKET, SO_BROADCAST, broadcast), "failed to set broadcast mode");
}
int MulticastSocket::Send(const void* data, size_t data_len)
{
SendUserData userData;
userData.dstAddr = (sockaddr*)&m_MulticastAddress;
userData.dstLen = sizeof(m_MulticastAddress);
return Socket::Send(data, data_len, &userData);
}
int MulticastSocket::Recv(void* data, size_t data_len, RecvUserData* userData)
{
int result = Socket::Recv(data, data_len, userData);
return result;
}
#undef Error
#undef SocketError
// ---------------------------------------------------------------------------
#if ENABLE_UNIT_TESTS && !UNITY_XENON
#include "External/UnitTest++/src/UnitTest++.h"
#include "NetworkUtility.h"
SUITE (MulticastSocketTests)
{
struct SocketFixture
{
SocketFixture()
{
NetworkInitialize();
};
~SocketFixture()
{
NetworkCleanup();
}
};
#if !UNITY_XENON
TEST_FIXTURE(SocketFixture, Multicast)
{
char actual[10], expected[] = "foobar";
MulticastSocket sender;
CHECK(sender.Initialize("225.0.0.224", 54996));
CHECK(sender.SetTTL(0));
CHECK(sender.SetLoop(true));
MulticastSocket receiver;
CHECK(receiver.Initialize("225.0.0.224", 54996, true));
CHECK(receiver.Join());
CHECK_EQUAL(sizeof(expected), sender.Send(expected, sizeof(expected)));
CHECK_EQUAL(sizeof(expected), receiver.Recv(actual, sizeof(actual)));
CHECK_EQUAL(expected, actual);
CHECK(receiver.Disband());
}
#endif
}
#endif //ENABLE_UNIT_TESTS
#endif // !UNITY_WINRT
#endif // ENABLE_SOCKETS
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