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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
* Copyright (c) 2014, Regents of the University of California,
* Arizona Board of Regents,
* Colorado State University,
* University Pierre & Marie Curie, Sorbonne University,
* Washington University in St. Louis,
* Beijing Institute of Technology,
* The University of Memphis
*
* This file is part of NFD (Named Data Networking Forwarding Daemon).
* See AUTHORS.md for complete list of NFD authors and contributors.
*
* NFD 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,
* either version 3 of the License, or (at your option) any later version.
*
* NFD 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
* NFD, e.g., in COPYING.md file. If not, see <http://www.gnu.org/licenses/>.
*/
#include "udp-factory.hpp"
#include "core/global-io.hpp"
#include "core/resolver.hpp"
#include "core/network-interface.hpp"
#if defined(__linux__)
#include <sys/socket.h>
#endif
namespace nfd {
using namespace boost::asio;
NFD_LOG_INIT("UdpFactory");
UdpFactory::UdpFactory(const std::string& defaultPort/* = "6363"*/)
: m_defaultPort(defaultPort)
{
}
void
UdpFactory::prohibitEndpoint(const udp::Endpoint& endpoint)
{
using namespace boost::asio::ip;
static const address_v4 ALL_V4_ENDPOINT(address_v4::from_string("0.0.0.0"));
static const address_v6 ALL_V6_ENDPOINT(address_v6::from_string("::"));
const address& address = endpoint.address();
if (address.is_v4() && address == ALL_V4_ENDPOINT)
{
prohibitAllIpv4Endpoints(endpoint.port());
}
else if (endpoint.address().is_v6() && address == ALL_V6_ENDPOINT)
{
prohibitAllIpv6Endpoints(endpoint.port());
}
NFD_LOG_TRACE("prohibiting UDP " <<
endpoint.address().to_string() << ":" << endpoint.port());
m_prohibitedEndpoints.insert(endpoint);
}
void
UdpFactory::prohibitAllIpv4Endpoints(const uint16_t port)
{
using namespace boost::asio::ip;
static const address_v4 INVALID_BROADCAST(address_v4::from_string("0.0.0.0"));
const std::list<shared_ptr<NetworkInterfaceInfo> > nicList(listNetworkInterfaces());
for (std::list<shared_ptr<NetworkInterfaceInfo> >::const_iterator i = nicList.begin();
i != nicList.end();
++i)
{
const shared_ptr<NetworkInterfaceInfo>& nic = *i;
const std::vector<address_v4>& ipv4Addresses = nic->ipv4Addresses;
for (std::vector<address_v4>::const_iterator j = ipv4Addresses.begin();
j != ipv4Addresses.end();
++j)
{
prohibitEndpoint(udp::Endpoint(*j, port));
}
if (nic->isBroadcastCapable() && nic->broadcastAddress != INVALID_BROADCAST)
{
NFD_LOG_TRACE("prohibiting broadcast address: " << nic->broadcastAddress.to_string());
prohibitEndpoint(udp::Endpoint(nic->broadcastAddress, port));
}
}
prohibitEndpoint(udp::Endpoint(address::from_string("255.255.255.255"), port));
}
void
UdpFactory::prohibitAllIpv6Endpoints(const uint16_t port)
{
using namespace boost::asio::ip;
const std::list<shared_ptr<NetworkInterfaceInfo> > nicList(listNetworkInterfaces());
for (std::list<shared_ptr<NetworkInterfaceInfo> >::const_iterator i = nicList.begin();
i != nicList.end();
++i)
{
const shared_ptr<NetworkInterfaceInfo>& nic = *i;
const std::vector<address_v6>& ipv6Addresses = nic->ipv6Addresses;
for (std::vector<address_v6>::const_iterator j = ipv6Addresses.begin();
j != ipv6Addresses.end();
++j)
{
prohibitEndpoint(udp::Endpoint(*j, port));
}
}
}
shared_ptr<UdpChannel>
UdpFactory::createChannel(const udp::Endpoint& endpoint,
const time::seconds& timeout)
{
NFD_LOG_DEBUG("Creating unicast " << endpoint);
shared_ptr<UdpChannel> channel = findChannel(endpoint);
if (static_cast<bool>(channel))
return channel;
//checking if the endpoint is already in use for multicast face
shared_ptr<MulticastUdpFace> multicast = findMulticastFace(endpoint);
if (static_cast<bool>(multicast))
throw Error("Cannot create the requested UDP unicast channel, local "
"endpoint is already allocated for a UDP multicast face");
if (endpoint.address().is_multicast()) {
throw Error("This method is only for unicast channel. The provided "
"endpoint is multicast. Use createMulticastFace to "
"create a multicast face");
}
channel = make_shared<UdpChannel>(endpoint, timeout);
m_channels[endpoint] = channel;
prohibitEndpoint(endpoint);
return channel;
}
shared_ptr<UdpChannel>
UdpFactory::createChannel(const std::string& localHost,
const std::string& localPort,
const time::seconds& timeout)
{
return createChannel(UdpResolver::syncResolve(localHost, localPort),
timeout);
}
shared_ptr<MulticastUdpFace>
UdpFactory::createMulticastFace(const udp::Endpoint& localEndpoint,
const udp::Endpoint& multicastEndpoint,
const std::string& networkInterfaceName /* "" */)
{
//checking if the local and multicast endpoint are already in use for a multicast face
shared_ptr<MulticastUdpFace> multicastFace = findMulticastFace(localEndpoint);
if (static_cast<bool>(multicastFace)) {
if (multicastFace->getMulticastGroup() == multicastEndpoint)
return multicastFace;
else
throw Error("Cannot create the requested UDP multicast face, local "
"endpoint is already allocated for a UDP multicast face "
"on a different multicast group");
}
//checking if the local endpoint is already in use for an unicast channel
shared_ptr<UdpChannel> unicast = findChannel(localEndpoint);
if (static_cast<bool>(unicast)) {
throw Error("Cannot create the requested UDP multicast face, local "
"endpoint is already allocated for a UDP unicast channel");
}
if (m_prohibitedEndpoints.find(multicastEndpoint) != m_prohibitedEndpoints.end()) {
throw Error("Cannot create the requested UDP multicast face, "
"remote endpoint is owned by this NFD instance");
}
if (localEndpoint.address().is_v6() || multicastEndpoint.address().is_v6()) {
throw Error("IPv6 multicast is not supported yet. Please provide an IPv4 address");
}
if (localEndpoint.port() != multicastEndpoint.port()) {
throw Error("Cannot create the requested UDP multicast face, "
"both endpoints should have the same port number. ");
}
if (!multicastEndpoint.address().is_multicast()) {
throw Error("Cannot create the requested UDP multicast face, "
"the multicast group given as input is not a multicast address");
}
shared_ptr<ip::udp::socket> clientSocket =
make_shared<ip::udp::socket>(ref(getGlobalIoService()));
clientSocket->open(multicastEndpoint.protocol());
clientSocket->set_option(ip::udp::socket::reuse_address(true));
try {
clientSocket->bind(multicastEndpoint);
if (localEndpoint.address() != ip::address::from_string("0.0.0.0")) {
clientSocket->set_option(ip::multicast::outbound_interface(localEndpoint.address().to_v4()));
}
clientSocket->set_option(ip::multicast::join_group(multicastEndpoint.address().to_v4(),
localEndpoint.address().to_v4()));
}
catch (boost::system::system_error& e) {
std::stringstream msg;
msg << "Failed to properly configure the socket, check the address (" << e.what() << ")";
throw Error(msg.str());
}
#if defined(__linux__)
//On linux system, if there are more than one MulticastUdpFace for the same multicast group but
//bound on different network interfaces, the socket has to be bound with the specific interface
//using SO_BINDTODEVICE, otherwise the face will receive packets also from other interfaces.
//Without SO_BINDTODEVICE every MulticastUdpFace that have joined the same multicast group
//on different interfaces will receive the same packet.
//This applies only on linux, for OS X the ip::multicast::join_group is enough to get
//the desired behaviour
if (!networkInterfaceName.empty()) {
if (::setsockopt(clientSocket->native_handle(), SOL_SOCKET, SO_BINDTODEVICE,
networkInterfaceName.c_str(), networkInterfaceName.size()+1) == -1){
throw Error("Cannot bind multicast face to " + networkInterfaceName
+ " make sure you have CAP_NET_RAW capability" );
}
}
#endif
clientSocket->set_option(ip::multicast::enable_loopback(false));
multicastFace = make_shared<MulticastUdpFace>(clientSocket, localEndpoint);
multicastFace->onFail += bind(&UdpFactory::afterFaceFailed, this, localEndpoint);
m_multicastFaces[localEndpoint] = multicastFace;
return multicastFace;
}
shared_ptr<MulticastUdpFace>
UdpFactory::createMulticastFace(const std::string& localIp,
const std::string& multicastIp,
const std::string& multicastPort,
const std::string& networkInterfaceName /* "" */)
{
return createMulticastFace(UdpResolver::syncResolve(localIp,
multicastPort),
UdpResolver::syncResolve(multicastIp,
multicastPort),
networkInterfaceName);
}
void
UdpFactory::createFace(const FaceUri& uri,
const FaceCreatedCallback& onCreated,
const FaceConnectFailedCallback& onConnectFailed)
{
resolver::AddressSelector addressSelector = resolver::AnyAddress();
if (uri.getScheme() == "udp4")
addressSelector = resolver::Ipv4Address();
else if (uri.getScheme() == "udp6")
addressSelector = resolver::Ipv6Address();
if (!uri.getPath().empty())
{
onConnectFailed("Invalid URI");
}
UdpResolver::asyncResolve(uri.getHost(),
uri.getPort().empty() ? m_defaultPort : uri.getPort(),
bind(&UdpFactory::continueCreateFaceAfterResolve, this, _1,
onCreated, onConnectFailed),
onConnectFailed,
addressSelector);
}
void
UdpFactory::continueCreateFaceAfterResolve(const udp::Endpoint& endpoint,
const FaceCreatedCallback& onCreated,
const FaceConnectFailedCallback& onConnectFailed)
{
if (endpoint.address().is_multicast()) {
onConnectFailed("The provided address is multicast. Please use createMulticastFace method");
return;
}
if (m_prohibitedEndpoints.find(endpoint) != m_prohibitedEndpoints.end())
{
onConnectFailed("Requested endpoint is prohibited "
"(reserved by this NFD or disallowed by face management protocol)");
return;
}
// very simple logic for now
for (ChannelMap::iterator channel = m_channels.begin();
channel != m_channels.end();
++channel)
{
if ((channel->first.address().is_v4() && endpoint.address().is_v4()) ||
(channel->first.address().is_v6() && endpoint.address().is_v6()))
{
channel->second->connect(endpoint, onCreated, onConnectFailed);
return;
}
}
onConnectFailed("No channels available to connect to " +
boost::lexical_cast<std::string>(endpoint));
}
shared_ptr<UdpChannel>
UdpFactory::findChannel(const udp::Endpoint& localEndpoint)
{
ChannelMap::iterator i = m_channels.find(localEndpoint);
if (i != m_channels.end())
return i->second;
else
return shared_ptr<UdpChannel>();
}
shared_ptr<MulticastUdpFace>
UdpFactory::findMulticastFace(const udp::Endpoint& localEndpoint)
{
MulticastFaceMap::iterator i = m_multicastFaces.find(localEndpoint);
if (i != m_multicastFaces.end())
return i->second;
else
return shared_ptr<MulticastUdpFace>();
}
void
UdpFactory::afterFaceFailed(udp::Endpoint& endpoint)
{
NFD_LOG_DEBUG("afterFaceFailed: " << endpoint);
m_multicastFaces.erase(endpoint);
}
std::list<shared_ptr<const Channel> >
UdpFactory::getChannels() const
{
std::list<shared_ptr<const Channel> > channels;
for (ChannelMap::const_iterator i = m_channels.begin(); i != m_channels.end(); ++i)
{
channels.push_back(i->second);
}
return channels;
}
} // namespace nfd