util: rtnetlink-based implementation of NetworkMonitor
Change-Id: Ia25ddf14ba38181f3a831c1eaf9b417baba7c9d3
Refs: #2443
diff --git a/src/util/network-monitor.cpp b/src/util/network-monitor.cpp
index b16e473..5513d0d 100644
--- a/src/util/network-monitor.cpp
+++ b/src/util/network-monitor.cpp
@@ -139,14 +139,85 @@
} // namespace ndn
// done with defined(NDN_CXX_HAVE_COREFOUNDATION_COREFOUNDATION_H)
-#elif defined(HAVE_DBUS)
+#elif defined(NDN_CXX_HAVE_RTNETLINK)
+
+#include <boost/asio.hpp>
+
+#include <netinet/in.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <net/if.h>
+
+#include <cerrno>
+#include <cstring>
namespace ndn {
namespace util {
-NetworkMonitor::NetworkMonitor(boost::asio::io_service&)
+const size_t NETLINK_BUFFER_SIZE = 4096;
+
+class NetworkMonitor::Impl
{
- throw Error("Not implemented yet");
+public:
+ Impl(NetworkMonitor& nm, boost::asio::io_service& io)
+ : m_nm(nm)
+ , m_socket(io)
+ {
+ int fd = ::socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
+ if (fd < 0)
+ throw Error(std::string("Cannot create netlink socket (") + std::strerror(errno) + ")");
+
+ sockaddr_nl addr{};
+ addr.nl_family = AF_NETLINK;
+ addr.nl_groups = RTMGRP_LINK |
+ RTMGRP_IPV4_IFADDR | RTMGRP_IPV4_ROUTE |
+ RTMGRP_IPV6_IFADDR | RTMGRP_IPV6_ROUTE;
+
+ if (::bind(fd, reinterpret_cast<sockaddr*>(&addr), sizeof(addr)) == -1) {
+ throw Error(std::string("Cannot bind on netlink socket (") + std::strerror(errno) + ")");
+ }
+
+ m_socket.assign(fd);
+
+ m_socket.async_read_some(boost::asio::buffer(m_buffer, NETLINK_BUFFER_SIZE),
+ bind(&Impl::onReceiveRtNetlink, this, _1, _2));
+ }
+
+private:
+ void
+ onReceiveRtNetlink(const boost::system::error_code& error, size_t nBytesReceived)
+ {
+ if (error) {
+ return;
+ }
+
+ const nlmsghdr* nlh = reinterpret_cast<const nlmsghdr*>(m_buffer);
+ while ((NLMSG_OK(nlh, nBytesReceived)) && (nlh->nlmsg_type != NLMSG_DONE)) {
+ if (nlh->nlmsg_type == RTM_NEWADDR || nlh->nlmsg_type == RTM_DELADDR ||
+ nlh->nlmsg_type == RTM_NEWLINK || nlh->nlmsg_type == RTM_DELLINK ||
+ nlh->nlmsg_type == RTM_NEWROUTE || nlh->nlmsg_type == RTM_DELROUTE) {
+ m_nm.onNetworkStateChanged();
+ break;
+ }
+ nlh = NLMSG_NEXT(nlh, nBytesReceived);
+ }
+
+ m_socket.async_read_some(boost::asio::buffer(m_buffer, NETLINK_BUFFER_SIZE),
+ bind(&Impl::onReceiveRtNetlink, this, _1, _2));
+ }
+
+private:
+ NetworkMonitor& m_nm;
+ uint8_t m_buffer[NETLINK_BUFFER_SIZE];
+
+ boost::asio::posix::stream_descriptor m_socket;
+};
+
+
+
+NetworkMonitor::NetworkMonitor(boost::asio::io_service& io)
+ : m_impl(new Impl(*this, io))
+{
}
NetworkMonitor::~NetworkMonitor()
@@ -156,7 +227,7 @@
} // namespace util
} // namespace ndn
-// done with defined(HAVE_DBUS)
+// done with defined(NDN_CXX_HAVE_RTNETLINK)
#else // do not support network monitoring operations
namespace ndn {
@@ -164,7 +235,6 @@
class NetworkMonitor::Impl
{
-public:
};
NetworkMonitor::NetworkMonitor(boost::asio::io_service&)
diff --git a/src/util/network-monitor.hpp b/src/util/network-monitor.hpp
index 9c7dc31..f3fc6b8 100644
--- a/src/util/network-monitor.hpp
+++ b/src/util/network-monitor.hpp
@@ -38,7 +38,7 @@
* @note Implementation of this class is platform dependent and not all supported platforms
* are supported:
* - OS X: CFNotificationCenterAddObserver
- * - Linux: NetworkManager notifications through DBus IPC
+ * - Linux: rtnetlink notifications
*
* Network state change detection is not guaranteed to be precise and (zero or more)
* notifications are expected to be fired for the following events:
diff --git a/wscript b/wscript
index 0000b7c..d4fcb82 100644
--- a/wscript
+++ b/wscript
@@ -64,6 +64,10 @@
}
''')
+ conf.check_cxx(msg='Checking for rtnetlink', mandatory=False,
+ define_name='HAVE_RTNETLINK',
+ header_name=['netinet/in.h', 'linux/netlink.h', 'linux/rtnetlink.h', 'net/if.h'])
+
conf.check_osx_security(mandatory=False)
conf.check_sqlite3(mandatory=True)
@@ -192,7 +196,7 @@
bld.recurse("examples")
headers = bld.path.ant_glob(['src/**/*.hpp'],
- excl=['src/**/*-osx.hpp', 'src/detail/*'])
+ excl=['src/**/*-osx.hpp', 'src/detail/**/*'])
if bld.env['HAVE_OSX_SECURITY']:
headers += bld.path.ant_glob('src/**/*-osx.hpp')