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/* -*- 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.
*
* @author Davide Pesavento <davide.pesavento@lip6.fr>
*/
#include "network-monitor-impl-rtnl.hpp"
#include "linux-if-constants.hpp"
#include "../network-address.hpp"
#include "../network-interface.hpp"
#include "../../util/logger.hpp"
#include "../../util/time.hpp"
#include <boost/asio/write.hpp>
#include <cerrno>
#include <cstdlib>
#include <net/if_arp.h>
#include <sys/socket.h>
NDN_LOG_INIT(ndn.NetworkMonitor);
namespace ndn {
namespace net {
NetworkMonitorImplRtnl::NetworkMonitorImplRtnl(boost::asio::io_service& io)
: m_socket(make_shared<boost::asio::posix::stream_descriptor>(io))
, m_pid(0)
, m_sequenceNo(static_cast<uint32_t>(time::system_clock::now().time_since_epoch().count()))
, m_isEnumeratingLinks(false)
, m_isEnumeratingAddresses(false)
{
initSocket();
asyncRead();
NDN_LOG_TRACE("enumerating links");
sendDumpRequest(RTM_GETLINK);
m_isEnumeratingLinks = true;
}
NetworkMonitorImplRtnl::~NetworkMonitorImplRtnl()
{
boost::system::error_code error;
m_socket->close(error);
}
shared_ptr<const NetworkInterface>
NetworkMonitorImplRtnl::getNetworkInterface(const std::string& ifname) const
{
for (const auto& e : m_interfaces) {
if (e.second->getName() == ifname)
return e.second;
}
return nullptr;
}
std::vector<shared_ptr<const NetworkInterface>>
NetworkMonitorImplRtnl::listNetworkInterfaces() const
{
std::vector<shared_ptr<const NetworkInterface>> v;
v.reserve(m_interfaces.size());
for (const auto& e : m_interfaces) {
v.push_back(e.second);
}
return v;
}
bool
NetworkMonitorImplRtnl::isEnumerating() const
{
return m_isEnumeratingLinks || m_isEnumeratingAddresses;
}
void
NetworkMonitorImplRtnl::initSocket()
{
NDN_LOG_TRACE("creating netlink socket");
int fd = ::socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE);
if (fd < 0) {
BOOST_THROW_EXCEPTION(Error(std::string("Cannot create netlink socket (") +
std::strerror(errno) + ")"));
}
m_socket->assign(fd);
sockaddr_nl addr{};
addr.nl_family = AF_NETLINK;
addr.nl_groups = RTMGRP_LINK | RTMGRP_NOTIFY |
RTMGRP_IPV4_IFADDR | RTMGRP_IPV4_ROUTE |
RTMGRP_IPV6_IFADDR | RTMGRP_IPV6_ROUTE;
if (::bind(fd, reinterpret_cast<sockaddr*>(&addr), sizeof(addr)) < 0) {
BOOST_THROW_EXCEPTION(Error(std::string("Cannot bind netlink socket (") +
std::strerror(errno) + ")"));
}
// find out what pid has been assigned to us
socklen_t len = sizeof(addr);
if (::getsockname(fd, reinterpret_cast<sockaddr*>(&addr), &len) < 0) {
BOOST_THROW_EXCEPTION(Error(std::string("Cannot obtain netlink socket address (") +
std::strerror(errno) + ")"));
}
if (len != sizeof(addr)) {
BOOST_THROW_EXCEPTION(Error("Wrong address length (" + to_string(len) + ")"));
}
if (addr.nl_family != AF_NETLINK) {
BOOST_THROW_EXCEPTION(Error("Wrong address family (" + to_string(addr.nl_family) + ")"));
}
m_pid = addr.nl_pid;
NDN_LOG_TRACE("our pid is " << m_pid);
}
void
NetworkMonitorImplRtnl::sendDumpRequest(uint16_t nlmsgType)
{
auto request = make_shared<RtnlRequest>();
request->nlh.nlmsg_len = sizeof(RtnlRequest);
request->nlh.nlmsg_type = nlmsgType;
request->nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
request->nlh.nlmsg_seq = ++m_sequenceNo;
request->nlh.nlmsg_pid = m_pid;
request->ifi.ifi_family = AF_UNSPEC;
request->rta.rta_type = IFLA_EXT_MASK;
request->rta.rta_len = RTA_LENGTH(sizeof(request->rtext));
request->rtext = 1 << 3; // RTEXT_FILTER_SKIP_STATS
boost::asio::async_write(*m_socket, boost::asio::buffer(request.get(), sizeof(RtnlRequest)),
// capture 'request' to prevent its premature deallocation
[request] (const boost::system::error_code& error, size_t) {
if (error && error != boost::asio::error::operation_aborted) {
NDN_LOG_ERROR("write failed: " << error.message());
BOOST_THROW_EXCEPTION(Error("Failed to send netlink request (" + error.message() + ")"));
}
});
}
static const char*
nlmsgTypeToString(uint16_t type)
{
#define NLMSG_STRINGIFY(x) case NLMSG_##x: return "<" #x ">"
#define RTM_STRINGIFY(x) case RTM_##x: return "<" #x ">"
switch (type) {
NLMSG_STRINGIFY(NOOP);
NLMSG_STRINGIFY(ERROR);
NLMSG_STRINGIFY(DONE);
NLMSG_STRINGIFY(OVERRUN);
RTM_STRINGIFY(NEWLINK);
RTM_STRINGIFY(DELLINK);
RTM_STRINGIFY(NEWADDR);
RTM_STRINGIFY(DELADDR);
RTM_STRINGIFY(NEWROUTE);
RTM_STRINGIFY(DELROUTE);
default:
return "";
}
#undef NLMSG_STRINGIFY
#undef RTM_STRINGIFY
}
static InterfaceType
ifiTypeToInterfaceType(uint16_t type)
{
switch (type) {
case ARPHRD_ETHER:
return InterfaceType::ETHERNET;
case ARPHRD_LOOPBACK:
return InterfaceType::LOOPBACK;
default:
return InterfaceType::UNKNOWN;
}
}
static AddressFamily
ifaFamilyToAddressFamily(uint8_t family)
{
switch (family) {
case AF_INET:
return AddressFamily::V4;
case AF_INET6:
return AddressFamily::V6;
default:
return AddressFamily::UNSPECIFIED;
}
}
static AddressScope
ifaScopeToAddressScope(uint8_t scope)
{
switch (scope) {
case RT_SCOPE_NOWHERE:
return AddressScope::NOWHERE;
case RT_SCOPE_HOST:
return AddressScope::HOST;
case RT_SCOPE_LINK:
return AddressScope::LINK;
default:
return AddressScope::GLOBAL;
}
}
void
NetworkMonitorImplRtnl::asyncRead()
{
m_socket->async_read_some(boost::asio::buffer(m_buffer),
bind(&NetworkMonitorImplRtnl::handleRead, this, _1, _2, m_socket));
}
void
NetworkMonitorImplRtnl::handleRead(const boost::system::error_code& error, size_t nBytesRead,
const shared_ptr<boost::asio::posix::stream_descriptor>& socket)
{
if (!socket->is_open() ||
error == boost::asio::error::operation_aborted) {
// socket was closed, ignore the error
NDN_LOG_TRACE("socket closed or operation aborted");
return;
}
if (error) {
NDN_LOG_ERROR("read failed: " << error.message());
BOOST_THROW_EXCEPTION(Error("Netlink socket read failed (" + error.message() + ")"));
}
NDN_LOG_TRACE("read " << nBytesRead << " bytes from netlink socket");
const nlmsghdr* nlh = reinterpret_cast<const nlmsghdr*>(m_buffer.data());
if (!isEnumerating() || (nlh->nlmsg_seq == m_sequenceNo && nlh->nlmsg_pid == m_pid)) {
parseNetlinkMessage(nlh, nBytesRead);
}
else {
NDN_LOG_TRACE("seq/pid mismatch, ignoring");
}
asyncRead();
}
void
NetworkMonitorImplRtnl::parseNetlinkMessage(const nlmsghdr* nlh, size_t len)
{
while (NLMSG_OK(nlh, len)) {
NDN_LOG_TRACE("parsing " << (nlh->nlmsg_flags & NLM_F_MULTI ? "multi-part " : "") <<
"message type=" << nlh->nlmsg_type << nlmsgTypeToString(nlh->nlmsg_type) <<
" len=" << nlh->nlmsg_len <<
" seq=" << nlh->nlmsg_seq <<
" pid=" << nlh->nlmsg_pid);
if (nlh->nlmsg_flags & NLM_F_DUMP_INTR) {
NDN_LOG_ERROR("netlink dump was interrupted");
// TODO: technically we should retry the dump...
break;
}
if (nlh->nlmsg_type == NLMSG_DONE)
break;
switch (nlh->nlmsg_type) {
case RTM_NEWLINK:
case RTM_DELLINK:
parseLinkMessage(nlh, reinterpret_cast<const ifinfomsg*>(NLMSG_DATA(nlh)));
if (!isEnumerating())
this->emitSignal(onNetworkStateChanged); // backward compat
break;
case RTM_NEWADDR:
case RTM_DELADDR:
parseAddressMessage(nlh, reinterpret_cast<const ifaddrmsg*>(NLMSG_DATA(nlh)));
if (!isEnumerating())
this->emitSignal(onNetworkStateChanged); // backward compat
break;
case RTM_NEWROUTE:
case RTM_DELROUTE:
parseRouteMessage(nlh, reinterpret_cast<const rtmsg*>(NLMSG_DATA(nlh)));
if (!isEnumerating())
this->emitSignal(onNetworkStateChanged); // backward compat
break;
case NLMSG_ERROR: {
const nlmsgerr* err = reinterpret_cast<const nlmsgerr*>(NLMSG_DATA(nlh));
if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(nlmsgerr)))
NDN_LOG_ERROR("truncated NLMSG_ERROR");
else if (err->error == 0)
// an error code of zero indicates an ACK message, not an error
NDN_LOG_TRACE("ACK");
else
NDN_LOG_ERROR("NLMSG_ERROR: " << std::strerror(std::abs(err->error)));
break;
}
}
nlh = NLMSG_NEXT(nlh, len);
}
if (nlh->nlmsg_type == NLMSG_DONE && m_isEnumeratingLinks) {
// links enumeration complete, now request all the addresses
m_isEnumeratingLinks = false;
NDN_LOG_TRACE("enumerating addresses");
sendDumpRequest(RTM_GETADDR);
m_isEnumeratingAddresses = true;
}
else if (nlh->nlmsg_type == NLMSG_DONE && m_isEnumeratingAddresses) {
// links and addresses enumeration complete
m_isEnumeratingAddresses = false;
// TODO: enumerate routes
NDN_LOG_DEBUG("enumeration complete");
this->emitSignal(onEnumerationCompleted);
}
}
void
NetworkMonitorImplRtnl::parseLinkMessage(const nlmsghdr* nlh, const ifinfomsg* ifi)
{
if (ifiTypeToInterfaceType(ifi->ifi_type) == InterfaceType::UNKNOWN) {
NDN_LOG_DEBUG("unhandled interface type " << ifi->ifi_type);
return;
}
shared_ptr<NetworkInterface> interface;
auto it = m_interfaces.find(ifi->ifi_index);
if (it != m_interfaces.end()) {
interface = it->second;
BOOST_ASSERT(interface != nullptr);
BOOST_ASSERT(interface->getIndex() == ifi->ifi_index);
}
if (nlh->nlmsg_type == RTM_DELLINK) {
if (interface != nullptr) {
NDN_LOG_DEBUG("removing interface " << interface->getName());
m_interfaces.erase(it);
this->emitSignal(onInterfaceRemoved, interface);
}
return;
}
if (interface == nullptr) {
interface = makeNetworkInterface();
interface->setIndex(ifi->ifi_index);
}
interface->setType(ifiTypeToInterfaceType(ifi->ifi_type));
interface->setFlags(ifi->ifi_flags);
const rtattr* rta = reinterpret_cast<const rtattr*>(IFLA_RTA(ifi));
size_t rtaTotalLen = IFLA_PAYLOAD(nlh);
uint8_t operState = linux_if::OPER_STATE_UNKNOWN;
while (RTA_OK(rta, rtaTotalLen)) {
size_t attrLen = RTA_PAYLOAD(rta);
switch (rta->rta_type) {
case IFLA_ADDRESS:
if (attrLen == ethernet::ADDR_LEN) {
ethernet::Address addr(reinterpret_cast<const uint8_t*>(RTA_DATA(rta)));
interface->setEthernetAddress(addr);
}
break;
case IFLA_BROADCAST:
if (attrLen == ethernet::ADDR_LEN) {
ethernet::Address addr(reinterpret_cast<const uint8_t*>(RTA_DATA(rta)));
interface->setEthernetBroadcastAddress(addr);
}
break;
case IFLA_IFNAME: {
auto attrData = reinterpret_cast<const char*>(RTA_DATA(rta));
if (::strnlen(attrData, attrLen) <= attrLen)
interface->setName(attrData);
break;
}
case IFLA_MTU:
if (attrLen == sizeof(uint32_t))
interface->setMtu(*(reinterpret_cast<const uint32_t*>(RTA_DATA(rta))));
break;
case IFLA_OPERSTATE:
if (attrLen == sizeof(uint8_t))
operState = *(reinterpret_cast<const uint8_t*>RTA_DATA(rta));
break;
}
rta = RTA_NEXT(rta, rtaTotalLen);
}
updateInterfaceState(*interface, operState);
if (it == m_interfaces.end()) {
NDN_LOG_DEBUG("adding interface " << interface->getName());
m_interfaces[interface->getIndex()] = interface;
this->emitSignal(onInterfaceAdded, interface);
}
}
void
NetworkMonitorImplRtnl::parseAddressMessage(const nlmsghdr* nlh, const ifaddrmsg* ifa)
{
auto it = m_interfaces.find(ifa->ifa_index);
if (it == m_interfaces.end()) {
// unknown interface, ignore message
NDN_LOG_TRACE("unknown interface index " << ifa->ifa_index);
return;
}
auto interface = it->second;
BOOST_ASSERT(interface != nullptr);
namespace ip = boost::asio::ip;
ip::address ipAddr, broadcast;
uint32_t flags = ifa->ifa_flags; // will be overridden by IFA_FLAGS if the attribute is present
const rtattr* rta = reinterpret_cast<const rtattr*>(IFA_RTA(ifa));
size_t rtaTotalLen = IFA_PAYLOAD(nlh);
while (RTA_OK(rta, rtaTotalLen)) {
auto attrData = reinterpret_cast<const unsigned char*>(RTA_DATA(rta));
size_t attrLen = RTA_PAYLOAD(rta);
switch (rta->rta_type) {
case IFA_LOCAL:
if (ifa->ifa_family == AF_INET && attrLen == sizeof(ip::address_v4::bytes_type)) {
ip::address_v4::bytes_type bytes;
std::copy_n(attrData, bytes.size(), bytes.begin());
ipAddr = ip::address_v4(bytes);
}
break;
case IFA_ADDRESS:
if (ifa->ifa_family == AF_INET6 && attrLen == sizeof(ip::address_v6::bytes_type)) {
ip::address_v6::bytes_type bytes;
std::copy_n(attrData, bytes.size(), bytes.begin());
ipAddr = ip::address_v6(bytes);
}
break;
case IFA_BROADCAST:
if (ifa->ifa_family == AF_INET && attrLen == sizeof(ip::address_v4::bytes_type)) {
ip::address_v4::bytes_type bytes;
std::copy_n(attrData, bytes.size(), bytes.begin());
broadcast = ip::address_v4(bytes);
}
break;
#ifdef NDN_CXX_HAVE_IFA_FLAGS
case IFA_FLAGS:
if (attrLen == sizeof(uint32_t))
flags = *(reinterpret_cast<const uint32_t*>(attrData));
break;
#endif // NDN_CXX_HAVE_IFA_FLAGS
}
rta = RTA_NEXT(rta, rtaTotalLen);
}
NetworkAddress address(
ifaFamilyToAddressFamily(ifa->ifa_family),
ipAddr,
broadcast,
ifa->ifa_prefixlen,
ifaScopeToAddressScope(ifa->ifa_scope),
flags);
BOOST_ASSERT(address.getFamily() != AddressFamily::UNSPECIFIED);
if (nlh->nlmsg_type == RTM_NEWADDR)
interface->addNetworkAddress(address);
else if (nlh->nlmsg_type == RTM_DELADDR)
interface->removeNetworkAddress(address);
}
void
NetworkMonitorImplRtnl::parseRouteMessage(const nlmsghdr* nlh, const rtmsg* rtm)
{
// TODO
}
void
NetworkMonitorImplRtnl::updateInterfaceState(NetworkInterface& interface, uint8_t operState)
{
if (operState == linux_if::OPER_STATE_UP) {
interface.setState(InterfaceState::RUNNING);
}
else if (operState == linux_if::OPER_STATE_DORMANT) {
interface.setState(InterfaceState::DORMANT);
}
else {
// fallback to flags
auto flags = interface.getFlags();
if ((flags & linux_if::FLAG_LOWER_UP) && !(flags & linux_if::FLAG_DORMANT))
interface.setState(InterfaceState::RUNNING);
else if (flags & IFF_UP)
interface.setState(InterfaceState::NO_CARRIER);
else
interface.setState(InterfaceState::DOWN);
}
}
} // namespace net
} // namespace ndn