blob: 4824bab96b2315505e59f4abe8a8d03fe542d5bf [file] [log] [blame]
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
* Copyright (c) 2013-2017 Regents of the University of California.
*
* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
*
* ndn-cxx library is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later version.
*
* ndn-cxx library 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 Lesser General Public License for more details.
*
* You should have received copies of the GNU General Public License and GNU Lesser
* General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see
* <http://www.gnu.org/licenses/>.
*
* See AUTHORS.md for complete list of ndn-cxx authors and contributors.
*
*
* Parts of this implementation is based on daemondo command of MacPorts
* (https://www.macports.org/):
*
* Copyright (c) 2005-2007 James Berry <jberry@macports.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of The MacPorts Project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "ndn-cxx-config.hpp"
#include "network-monitor-impl-osx.hpp"
#include "../../name.hpp"
#include "../logger.hpp"
#include "../network-address.hpp"
#include <ifaddrs.h> // for getifaddrs()
#include <arpa/inet.h> // for inet_ntop()
#include <netinet/in.h> // for struct sockaddr_in{,6}
#include <net/if_dl.h> // for struct sockaddr_dl
#include <net/if_types.h> // for IFT_* constants
#include <boost/asio.hpp>
namespace ndn {
namespace util {
NDN_LOG_INIT(ndn.NetworkMonitor);
NetworkMonitor::Impl::Impl(NetworkMonitor& nm, boost::asio::io_service& io)
: m_nm(nm)
, m_scheduler(io)
, m_cfLoopEvent(m_scheduler)
, m_context{0, this, nullptr, nullptr, nullptr}
, m_scStore(SCDynamicStoreCreate(nullptr, CFSTR("net.named-data.ndn-cxx.NetworkMonitor"),
&Impl::onConfigChanged, &m_context))
, m_loopSource(SCDynamicStoreCreateRunLoopSource(nullptr, m_scStore.get(), 0))
, m_nullUdpSocket(io, boost::asio::ip::udp::v4())
{
scheduleCfLoop();
// Notifications from Darwin Notify Center:
//
// com.apple.system.config.network_change
//
CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(),
static_cast<void*>(this),
&Impl::afterNotificationCenterEvent,
CFSTR("com.apple.system.config.network_change"),
nullptr, // object to observe
CFNotificationSuspensionBehaviorDeliverImmediately);
io.post([this] { enumerateInterfaces(); });
CFRunLoopAddSource(CFRunLoopGetCurrent(), m_loopSource.get(), kCFRunLoopDefaultMode);
// Notifications from SystemConfiguration:
//
// State:/Network/Interface/.*/Link
// State:/Network/Interface/.*/IPv4
// State:/Network/Interface/.*/IPv6
// State:/Network/Global/DNS
// State:/Network/Global/IPv4
//
auto patterns = CFArrayCreateMutable(nullptr, 0, &kCFTypeArrayCallBacks);
CFArrayAppendValue(patterns, CFSTR("State:/Network/Interface/.*/Link"));
CFArrayAppendValue(patterns, CFSTR("State:/Network/Interface/.*/IPv4"));
CFArrayAppendValue(patterns, CFSTR("State:/Network/Interface/.*/IPv6"));
// CFArrayAppendValue(patterns, CFSTR("State:/Network/Global/DNS"));
// CFArrayAppendValue(patterns, CFSTR("State:/Network/Global/IPv4"));
SCDynamicStoreSetNotificationKeys(m_scStore.get(), nullptr, patterns);
}
NetworkMonitor::Impl::~Impl()
{
CFRunLoopRemoveSource(CFRunLoopGetCurrent(), m_loopSource.get(), kCFRunLoopDefaultMode);
CFNotificationCenterRemoveEveryObserver(CFNotificationCenterGetDarwinNotifyCenter(),
static_cast<void*>(this));
}
shared_ptr<NetworkInterface>
NetworkMonitor::Impl::getNetworkInterface(const std::string& ifname) const
{
auto it = m_interfaces.find(ifname);
if (it != m_interfaces.end()) {
return it->second;
}
else {
return nullptr;
}
}
std::vector<shared_ptr<NetworkInterface>>
NetworkMonitor::Impl::listNetworkInterfaces() const
{
std::vector<shared_ptr<NetworkInterface>> v;
v.reserve(m_interfaces.size());
for (const auto& e : m_interfaces) {
v.push_back(e.second);
}
return v;
}
void
NetworkMonitor::Impl::afterNotificationCenterEvent(CFNotificationCenterRef center,
void* observer,
CFStringRef name,
const void* object,
CFDictionaryRef userInfo)
{
static_cast<Impl*>(observer)->m_nm.onNetworkStateChanged();
}
void
NetworkMonitor::Impl::scheduleCfLoop()
{
// poll each second for new events
m_cfLoopEvent = m_scheduler.scheduleEvent(time::seconds(1), bind(&Impl::pollCfLoop, this));
}
void
NetworkMonitor::Impl::pollCfLoop()
{
// this should dispatch ready events and exit
CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0, true);
scheduleCfLoop();
}
void
NetworkMonitor::Impl::addNewInterface(const std::string& ifName)
{
shared_ptr<NetworkInterface> interface(new NetworkInterface);
interface->setName(ifName);
interface->setState(getInterfaceState(interface->getName()));
updateInterfaceInfo(*interface);
if (interface->getType() == InterfaceType::UNKNOWN) {
NDN_LOG_DEBUG("ignoring " << ifName << " because it has unhandled interface type");
return;
}
NDN_LOG_DEBUG("adding interface " << interface->getName());
m_interfaces.insert(make_pair(interface->getName(), interface));
m_nm.onInterfaceAdded(interface);
}
void
NetworkMonitor::Impl::enumerateInterfaces()
{
for (const auto& ifName : getInterfaceNames()) {
addNewInterface(ifName);
}
m_nm.onEnumerationCompleted();
}
static std::string
convertToStdString(CFStringRef cfString)
{
const char* cStr = CFStringGetCStringPtr(cfString, kCFStringEncodingASCII);
if (cStr != nullptr) {
return cStr;
}
size_t stringSize = CFStringGetLength(cfString);
char* buffer = new char[stringSize + 1];
CFStringGetCString(cfString, buffer, sizeof(buffer), kCFStringEncodingASCII);
std::string retval = buffer;
delete [] buffer;
return retval;
}
std::set<std::string>
NetworkMonitor::Impl::getInterfaceNames()
{
CFReleaser<CFDictionaryRef> dict = (CFDictionaryRef)SCDynamicStoreCopyValue(m_scStore.get(), CFSTR("State:/Network/Interface"));
CFArrayRef interfaces = (CFArrayRef)CFDictionaryGetValue(dict.get(), CFSTR("Interfaces"));
std::set<std::string> ifNames;
size_t count = CFArrayGetCount(interfaces);
for (size_t i = 0; i != count; ++i) {
auto ifName = (CFStringRef)CFArrayGetValueAtIndex(interfaces, i);
ifNames.insert(convertToStdString(ifName));
}
return ifNames;
}
InterfaceState
NetworkMonitor::Impl::getInterfaceState(const std::string& ifName)
{
CFReleaser<CFStringRef> linkName = CFStringCreateWithCString(nullptr,
("State:/Network/Interface/" + ifName + "/Link").c_str(),
kCFStringEncodingASCII);
CFReleaser<CFDictionaryRef> dict = (CFDictionaryRef)SCDynamicStoreCopyValue(m_scStore.get(), linkName.get());
if (dict.get() == nullptr) {
return InterfaceState::UNKNOWN;
}
CFBooleanRef isActive = (CFBooleanRef)CFDictionaryGetValue(dict.get(), CFSTR("Active"));
if (isActive == nullptr) {
return InterfaceState::UNKNOWN;
}
return CFBooleanGetValue(isActive) ? InterfaceState::RUNNING : InterfaceState::DOWN;
}
void
NetworkMonitor::Impl::updateInterfaceInfo(NetworkInterface& netif)
{
ifaddrs* ifa_list = nullptr;
if (::getifaddrs(&ifa_list) < 0) {
BOOST_THROW_EXCEPTION(Error(std::string("getifaddrs() failed: ") + strerror(errno)));
}
for (ifaddrs* ifa = ifa_list; ifa != nullptr; ifa = ifa->ifa_next) {
if (ifa->ifa_name != netif.getName()) {
continue;
}
netif.setFlags(ifa->ifa_flags);
netif.setMtu(getInterfaceMtu(netif.getName()));
if (ifa->ifa_addr == nullptr)
continue;
NetworkAddress address;
switch (ifa->ifa_addr->sa_family) {
case AF_INET: {
address.m_family = AddressFamily::V4;
const sockaddr_in* sin = reinterpret_cast<sockaddr_in*>(ifa->ifa_addr);
boost::asio::ip::address_v4::bytes_type bytes;
std::copy_n(reinterpret_cast<const unsigned char*>(&sin->sin_addr), bytes.size(), bytes.begin());
address.m_ip = boost::asio::ip::address_v4(bytes);
const sockaddr_in* sinMask = reinterpret_cast<sockaddr_in*>(ifa->ifa_netmask);
std::copy_n(reinterpret_cast<const unsigned char*>(&sinMask->sin_addr), bytes.size(), bytes.begin());
uint8_t mask = 0;
for (auto byte : bytes) {
while (byte != 0) {
++mask;
byte <<= 1;
}
}
address.m_prefixLength = mask;
break;
}
case AF_INET6: {
address.m_family = AddressFamily::V6;
const sockaddr_in6* sin6 = reinterpret_cast<sockaddr_in6*>(ifa->ifa_addr);
boost::asio::ip::address_v6::bytes_type bytes;
std::copy_n(reinterpret_cast<const unsigned char*>(&sin6->sin6_addr), bytes.size(), bytes.begin());
address.m_ip = boost::asio::ip::address_v6(bytes);
const sockaddr_in6* sinMask = reinterpret_cast<sockaddr_in6*>(ifa->ifa_netmask);
std::copy_n(reinterpret_cast<const unsigned char*>(&sinMask->sin6_addr), bytes.size(), bytes.begin());
uint8_t mask = 0;
for (auto byte : bytes) {
while (byte != 0) {
++mask;
byte <<= 1;
}
}
address.m_prefixLength = mask;
break;
}
case AF_LINK: {
const sockaddr_dl* sdl = reinterpret_cast<sockaddr_dl*>(ifa->ifa_addr);
netif.setIndex(sdl->sdl_index);
if (sdl->sdl_type == IFT_ETHER && sdl->sdl_alen == ethernet::ADDR_LEN) {
netif.setType(InterfaceType::ETHERNET);
netif.setEthernetAddress(ethernet::Address(reinterpret_cast<uint8_t*>(LLADDR(sdl))));
NDN_LOG_TRACE(netif.getName() << ": set Ethernet address " << netif.getEthernetAddress());
}
else if (sdl->sdl_type == IFT_LOOP) {
netif.setType(InterfaceType::LOOPBACK);
}
else {
netif.setType(InterfaceType::UNKNOWN);
}
break;
}
default:
continue;
}
if (netif.canBroadcast() && ifa->ifa_broadaddr != nullptr) {
const sockaddr_in* sin = reinterpret_cast<sockaddr_in*>(ifa->ifa_broadaddr);
boost::asio::ip::address_v4::bytes_type bytes;
std::copy_n(reinterpret_cast<const unsigned char*>(&sin->sin_addr), bytes.size(), bytes.begin());
address.m_broadcast = boost::asio::ip::address_v4(bytes);
NDN_LOG_TRACE(netif.getName() << ": set IPv4 broadcast address " << address.m_broadcast);
}
if (netif.canBroadcast()) {
netif.setEthernetBroadcastAddress(ethernet::getBroadcastAddress());
}
netif.addNetworkAddress(address);
}
::freeifaddrs(ifa_list);
}
size_t
NetworkMonitor::Impl::getInterfaceMtu(const std::string& ifName)
{
ifreq ifr{};
std::strncpy(ifr.ifr_name, ifName.c_str(), sizeof(ifr.ifr_name) - 1);
if (::ioctl(m_nullUdpSocket.native_handle(), SIOCGIFMTU, &ifr) == 0) {
return static_cast<size_t>(ifr.ifr_mtu);
}
NDN_LOG_WARN("Failed to get interface MTU: " << std::strerror(errno));
return ethernet::MAX_DATA_LEN;
}
void
NetworkMonitor::Impl::onConfigChanged(SCDynamicStoreRef m_scStore, CFArrayRef changedKeys, void* context)
{
static_cast<Impl*>(context)->onConfigChanged(changedKeys);
}
void
NetworkMonitor::Impl::onConfigChanged(CFArrayRef changedKeys)
{
size_t count = CFArrayGetCount(changedKeys);
for (size_t i = 0; i != count; ++i) {
std::string keyName = convertToStdString((CFStringRef)CFArrayGetValueAtIndex(changedKeys, i));
Name key(keyName);
std::string ifName = key.at(-2).toUri();
auto ifIt = m_interfaces.find(ifName);
if (ifIt == m_interfaces.end()) {
addNewInterface(ifName);
return;
}
NetworkInterface& netif = *ifIt->second;
auto removeInterface = [&] {
NDN_LOG_DEBUG("removing interface " << ifName);
shared_ptr<NetworkInterface> removedInterface = ifIt->second;
m_interfaces.erase(ifIt);
m_nm.onInterfaceRemoved(removedInterface);
};
if (key.at(-1).toUri() == "Link") {
auto newState = getInterfaceState(ifName);
if (newState == InterfaceState::UNKNOWN) {
// check if it is really unknown or interface removed
if (getInterfaceNames().count(ifName) == 0) {
// newState = InterfaceState::DOWN;
removeInterface();
return;
}
}
NDN_LOG_TRACE("Status of " << ifName << " changed from " << netif.getState() << " to " << newState);
netif.setState(newState);
}
if (key.at(-1).toUri() == "IPv4" || key.at(-1).toUri() == "IPv6") {
NetworkInterface updatedInterface;
updatedInterface.setName(ifName);
updateInterfaceInfo(updatedInterface);
if (updatedInterface.getType() == InterfaceType::UNKNOWN) {
// somehow, type of interface changed to unknown
NDN_LOG_DEBUG("Removing " << ifName << " because it changed to unhandled interface type");
removeInterface();
return;
}
const auto& newAddrs = updatedInterface.getNetworkAddresses();
const auto& oldAddrs = netif.getNetworkAddresses();
std::set<NetworkAddress> added;
std::set<NetworkAddress> removed;
std::set_difference(newAddrs.begin(), newAddrs.end(),
oldAddrs.begin(), oldAddrs.end(), std::inserter(added, added.end()));
std::set_difference(oldAddrs.begin(), oldAddrs.end(),
newAddrs.begin(), newAddrs.end(), std::inserter(removed, removed.end()));
for (const auto& addr : removed) {
netif.removeNetworkAddress(addr);
}
for (const auto& addr : added) {
netif.addNetworkAddress(addr);
}
}
}
}
} // namespace util
} // namespace ndn