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//
// MulticastSocket.cpp
//
// Library: Net
// Package: Sockets
// Module: MulticastSocket
//
// Copyright (c) 2005-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/Net/MulticastSocket.h"
#ifdef POCO_NET_HAS_INTERFACE
#include "Poco/Net/NetException.h"
#include <cstring>
#if defined(hpux) && defined(_XOPEN_SOURCE_EXTENDED) && defined(POCO_HPUX_IP_MREQ_HACK)
// netinet/in.h does not define struct ip_mreq if
// _XOPEN_SOURCE_EXTENDED is #define'd in HP-UX 11.x
// versions prior to 11.30. Compile with -DPOCO_HPUX_IP_MREQ_HACK
// if you experience problems.
struct ip_mreq
{
struct in_addr imr_multiaddr;
struct in_addr imr_interface;
};
#endif
// some Unix variants don't have IPV6_ADD_MEMBERSHIP/IPV6_DROP_MEMBERSHIP
#if defined(IPV6_JOIN_GROUP) && !defined(IPV6_ADD_MEMBERSHIP)
#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
#define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
#endif
namespace Poco {
namespace Net {
MulticastSocket::MulticastSocket()
{
}
MulticastSocket::MulticastSocket(SocketAddress::Family family): DatagramSocket(family)
{
#if defined(POCO_OS_FAMILY_UNIX)
if (family == SocketAddress::UNIX_LOCAL)
throw Poco::InvalidArgumentException("Cannot create a MulticastSocket with UNIX_LOCAL socket");
#endif
}
MulticastSocket::MulticastSocket(const SocketAddress& address, bool reuseAddress): DatagramSocket(address, reuseAddress)
{
}
MulticastSocket::MulticastSocket(const Socket& socket): DatagramSocket(socket)
{
}
MulticastSocket::~MulticastSocket()
{
}
MulticastSocket& MulticastSocket::operator = (const Socket& socket)
{
DatagramSocket::operator = (socket);
return *this;
}
void MulticastSocket::setInterface(const NetworkInterface& interfc)
{
if (address().family() == SocketAddress::IPv4)
{
impl()->setOption(IPPROTO_IP, IP_MULTICAST_IF, interfc.firstAddress(IPAddress::IPv4));
}
#if defined(POCO_HAVE_IPv6)
else if (address().family() == SocketAddress::IPv6)
{
impl()->setOption(IPPROTO_IPV6, IPV6_MULTICAST_IF, interfc.index());
}
#endif
else throw UnsupportedFamilyException("Unknown or unsupported socket family.");
}
NetworkInterface MulticastSocket::getInterface() const
{
try
{
IPAddress addr;
impl()->getOption(IPPROTO_IP, IP_MULTICAST_IF, addr);
return NetworkInterface::forAddress(addr);
}
catch (Poco::Exception&)
{
#if defined(POCO_HAVE_IPv6)
int ix;
impl()->getOption(IPPROTO_IPV6, IPV6_MULTICAST_IF, ix);
return NetworkInterface::forIndex(ix);
#else
throw;
#endif
}
}
void MulticastSocket::setLoopback(bool flag)
{
if (address().af() == AF_INET)
{
unsigned char uflag = flag ? 1 : 0;
impl()->setOption(IPPROTO_IP, IP_MULTICAST_LOOP, uflag);
}
else
{
#if defined(POCO_HAVE_IPv6)
unsigned uflag = flag ? 1 : 0;
impl()->setOption(IPPROTO_IPV6, IPV6_MULTICAST_LOOP, uflag);
#endif
}
}
bool MulticastSocket::getLoopback() const
{
bool flag = false;
if (address().af() == AF_INET)
{
unsigned char uflag;
impl()->getOption(IPPROTO_IP, IP_MULTICAST_LOOP, uflag);
flag = uflag != 0;
}
else
{
#if defined(POCO_HAVE_IPv6)
unsigned uflag;
impl()->getOption(IPPROTO_IPV6, IPV6_MULTICAST_LOOP, uflag);
flag = uflag != 0;
#endif
}
return flag;
}
void MulticastSocket::setTimeToLive(unsigned value)
{
if (address().af() == AF_INET)
{
unsigned char ttl = (unsigned char) value;
impl()->setOption(IPPROTO_IP, IP_MULTICAST_TTL, ttl);
}
else
{
#if defined(POCO_HAVE_IPv6)
impl()->setOption(IPPROTO_IPV6, IPV6_MULTICAST_HOPS, value);
#endif
}
}
unsigned MulticastSocket::getTimeToLive() const
{
unsigned ttl(0);
if (address().af() == AF_INET)
{
unsigned char cttl;
impl()->getOption(IPPROTO_IP, IP_MULTICAST_TTL, cttl);
ttl = cttl;
}
else
{
#if defined(POCO_HAVE_IPv6)
impl()->getOption(IPPROTO_IPV6, IPV6_MULTICAST_HOPS, ttl);
#endif
}
return ttl;
}
void MulticastSocket::joinGroup(const IPAddress& groupAddress)
{
joinGroup(groupAddress, findFirstInterface(groupAddress));
}
void MulticastSocket::joinGroup(const IPAddress& groupAddress, const NetworkInterface& interfc)
{
if (groupAddress.af() == AF_INET)
{
struct ip_mreq mr;
std::memcpy(&mr.imr_multiaddr, groupAddress.addr(), groupAddress.length());
std::memcpy(&mr.imr_interface, interfc.firstAddress(IPAddress::IPv4).addr(), interfc.firstAddress(IPAddress::IPv4).length());
impl()->setRawOption(IPPROTO_IP, IP_ADD_MEMBERSHIP, &mr, sizeof(mr));
}
else
{
#if defined(POCO_HAVE_IPv6)
struct ipv6_mreq mr;
std::memcpy(&mr.ipv6mr_multiaddr, groupAddress.addr(), groupAddress.length());
mr.ipv6mr_interface = interfc.index();
impl()->setRawOption(IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mr, sizeof(mr));
#endif
}
}
NetworkInterface MulticastSocket::findFirstInterface(const IPAddress& groupAddress)
{
NetworkInterface::Map m = NetworkInterface::map();
if (groupAddress.family() == IPAddress::IPv4)
{
for (NetworkInterface::Map::const_iterator it = m.begin(); it != m.end(); ++it)
{
if (it->second.supportsIPv4() &&
it->second.firstAddress(IPAddress::IPv4).isUnicast() &&
!it->second.isLoopback() &&
!it->second.isPointToPoint())
{
return it->second;
}
}
}
#ifdef POCO_HAVE_IPv6
else if (groupAddress.family() == IPAddress::IPv6)
{
for (NetworkInterface::Map::const_iterator it = m.begin(); it != m.end(); ++it)
{
if (it->second.supportsIPv6() &&
it->second.firstAddress(IPAddress::IPv6).isUnicast() &&
!it->second.isLoopback() &&
!it->second.isPointToPoint())
{
return it->second;
}
}
}
#endif // POCO_HAVE_IPv6
throw NotFoundException("No multicast-eligible network interface found.");
}
void MulticastSocket::leaveGroup(const IPAddress& groupAddress)
{
NetworkInterface intf;
leaveGroup(groupAddress, intf);
}
void MulticastSocket::leaveGroup(const IPAddress& groupAddress, const NetworkInterface& interfc)
{
if (groupAddress.af() == AF_INET)
{
struct ip_mreq mr;
std::memcpy(&mr.imr_multiaddr, groupAddress.addr(), groupAddress.length());
std::memcpy(&mr.imr_interface, interfc.firstAddress(IPAddress::IPv4).addr(), interfc.firstAddress(IPAddress::IPv4).length());
impl()->setRawOption(IPPROTO_IP, IP_DROP_MEMBERSHIP, &mr, sizeof(mr));
}
else
{
#if defined(POCO_HAVE_IPv6)
struct ipv6_mreq mr;
std::memcpy(&mr.ipv6mr_multiaddr, groupAddress.addr(), groupAddress.length());
mr.ipv6mr_interface = interfc.index();
impl()->setRawOption(IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mr, sizeof(mr));
#endif
}
}
} } // namespace Poco::Net
#endif // POCO_NET_HAS_INTERFACE
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