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#include "rtnetlink_server.hpp"
#include "types.hpp"
#include "util.hpp"
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <net/if.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <systemd/sd-daemon.h>
#include <unistd.h>
#include <memory>
#include <phosphor-logging/elog-errors.hpp>
#include <phosphor-logging/log.hpp>
#include <xyz/openbmc_project/Common/error.hpp>
namespace phosphor
{
namespace network
{
extern std::unique_ptr<Timer> refreshObjectTimer;
namespace rtnetlink
{
static bool shouldRefresh(const struct nlmsghdr& hdr)
{
switch (hdr.nlmsg_type)
{
case RTM_NEWADDR:
case RTM_DELADDR:
{
return true;
}
}
return false;
}
/* Call Back for the sd event loop */
static int eventHandler(sd_event_source* es, int fd, uint32_t revents,
void* userdata)
{
char buffer[phosphor::network::rtnetlink::BUFSIZE]{};
int len{};
auto netLinkHeader = reinterpret_cast<struct nlmsghdr*>(buffer);
while ((len = recv(fd, netLinkHeader, phosphor::network::rtnetlink::BUFSIZE,
0)) > 0)
{
for (; (NLMSG_OK(netLinkHeader, len)) &&
(netLinkHeader->nlmsg_type != NLMSG_DONE);
netLinkHeader = NLMSG_NEXT(netLinkHeader, len))
{
if (shouldRefresh(*netLinkHeader))
{
// starting the timer here to make sure that we don't want
// create the child objects multiple times.
if (!refreshObjectTimer->isEnabled())
{
// if start timer throws exception then let the application
// crash
refreshObjectTimer->restartOnce(refreshTimeout);
} // end if
} // end if
} // end for
} // end while
return 0;
}
Server::Server(EventPtr& eventPtr, const phosphor::Descriptor& smartSock)
{
using namespace phosphor::logging;
using InternalFailure =
sdbusplus::xyz::openbmc_project::Common::Error::InternalFailure;
struct sockaddr_nl addr
{
};
int r{};
sigset_t ss{};
// check that the given socket is valid or not.
if (smartSock() < 0)
{
r = -EBADF;
goto finish;
}
if (sigemptyset(&ss) < 0 || sigaddset(&ss, SIGTERM) < 0 ||
sigaddset(&ss, SIGINT) < 0)
{
r = -errno;
goto finish;
}
/* Block SIGTERM first, so that the event loop can handle it */
if (sigprocmask(SIG_BLOCK, &ss, NULL) < 0)
{
r = -errno;
goto finish;
}
/* Let's make use of the default handler and "floating"
reference features of sd_event_add_signal() */
r = sd_event_add_signal(eventPtr.get(), NULL, SIGTERM, NULL, NULL);
if (r < 0)
{
goto finish;
}
r = sd_event_add_signal(eventPtr.get(), NULL, SIGINT, NULL, NULL);
if (r < 0)
{
goto finish;
}
std::memset(&addr, 0, sizeof(addr));
addr.nl_family = AF_NETLINK;
addr.nl_groups = RTMGRP_IPV4_IFADDR | RTMGRP_IPV6_IFADDR;
if (bind(smartSock(), (struct sockaddr*)&addr, sizeof(addr)) < 0)
{
r = -errno;
goto finish;
}
r = sd_event_add_io(eventPtr.get(), nullptr, smartSock(), EPOLLIN,
eventHandler, nullptr);
if (r < 0)
{
goto finish;
}
finish:
if (r < 0)
{
log<level::ERR>("Failure Occurred in starting of server:",
entry("ERRNO=%d", errno));
elog<InternalFailure>();
}
}
} // namespace rtnetlink
} // namespace network
} // namespace phosphor
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