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// Copyright (C) 2012-2020 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#include <config.h>
#include <perfdhcp/perf_socket.h>
#include <perfdhcp/command_options.h>
#include <perfdhcp/stats_mgr.h>
#include <dhcp/iface_mgr.h>
#include <asiolink/io_address.h>
using namespace isc::dhcp;
using namespace isc::asiolink;
namespace isc {
namespace perfdhcp {
PerfSocket::PerfSocket(CommandOptions& options) {
sockfd_ = openSocket(options);
initSocketData();
}
int
PerfSocket::openSocket(CommandOptions& options) const {
std::string localname = options.getLocalName();
std::string servername = options.getServerName();
uint16_t port = options.getLocalPort();
int sock = 0;
uint8_t family = (options.getIpVersion() == 6) ? AF_INET6 : AF_INET;
IOAddress remoteaddr(servername);
// Check for mismatch between IP option and server address
if (family != remoteaddr.getFamily()) {
isc_throw(InvalidParameter,
"Values for IP version: " <<
static_cast<unsigned int>(options.getIpVersion()) <<
" and server address: " << servername << " are mismatched.");
}
if (port == 0) {
if (family == AF_INET6) {
// need server port (547) because the server is acting as a relay agent
port = DHCP6_CLIENT_PORT;
// if acting as a relay agent change port.
if (options.isUseRelayedV6()) {
port = DHCP6_SERVER_PORT;
}
} else if (options.getIpVersion() == 4) {
port = 67; /// @todo: find out why port 68 is wrong here.
}
}
// Local name is specified along with '-l' option.
// It may point to interface name or local address.
if (!localname.empty()) {
// CommandOptions should be already aware whether local name
// is interface name or address because it uses IfaceMgr to
// scan interfaces and get's their names.
if (options.isInterface()) {
sock = IfaceMgr::instance().openSocketFromIface(localname,
port,
family);
} else {
IOAddress localaddr(localname);
sock = IfaceMgr::instance().openSocketFromAddress(localaddr,
port);
}
} else if (!servername.empty()) {
// If only server name is given we will need to try to resolve
// the local address to bind socket to based on remote address.
sock = IfaceMgr::instance().openSocketFromRemoteAddress(remoteaddr,
port);
}
if (sock <= 0) {
isc_throw(BadValue, "unable to open socket to communicate with "
"DHCP server");
}
// IfaceMgr does not set broadcast option on the socket. We rely
// on CommandOptions object to find out if socket has to have
// broadcast enabled.
if ((options.getIpVersion() == 4) && options.isBroadcast()) {
int broadcast_enable = 1;
int ret = setsockopt(sock, SOL_SOCKET, SO_BROADCAST,
&broadcast_enable, sizeof(broadcast_enable));
if (ret < 0) {
isc_throw(InvalidOperation,
"unable to set broadcast option on the socket");
}
} else if (options.getIpVersion() == 6) {
// If remote address is multicast we need to enable it on
// the socket that has been created.
if (remoteaddr.isV6Multicast()) {
int hops = 1;
int ret = setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
&hops, sizeof(hops));
// If user specified interface name with '-l' the
// IPV6_MULTICAST_IF has to be set.
if ((ret >= 0) && options.isInterface()) {
IfacePtr iface =
IfaceMgr::instance().getIface(options.getLocalName());
if (iface == NULL) {
isc_throw(Unexpected, "unknown interface "
<< options.getLocalName());
}
int idx = iface->getIndex();
ret = setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_IF,
&idx, sizeof(idx));
}
if (ret < 0) {
isc_throw(InvalidOperation,
"unable to enable multicast on socket " << sock
<< ". errno = " << errno);
}
}
}
return (sock);
}
PerfSocket::~PerfSocket() {
IfacePtr iface = IfaceMgr::instance().getIface(ifindex_);
if (iface) {
iface->delSocket(sockfd_);
}
}
void
PerfSocket::initSocketData() {
for (auto const& iface : IfaceMgr::instance().getIfaces()) {
for (auto const& s : iface->getSockets()) {
if (s.sockfd_ == sockfd_) {
ifindex_ = iface->getIndex();
addr_ = s.addr_;
return;
}
}
}
isc_throw(BadValue, "interface for specified socket descriptor not found");
}
Pkt4Ptr
PerfSocket::receive4(uint32_t timeout_sec, uint32_t timeout_usec) {
Pkt4Ptr pkt = IfaceMgr::instance().receive4(timeout_sec, timeout_usec);
if (pkt) {
try {
pkt->unpack();
} catch (const std::exception &e) {
ExchangeStats::malformed_pkts_++;
std::cout << "Incorrect DHCP packet received"
<< e.what() << std::endl;
}
}
return (pkt);
}
Pkt6Ptr
PerfSocket::receive6(uint32_t timeout_sec, uint32_t timeout_usec) {
Pkt6Ptr pkt = IfaceMgr::instance().receive6(timeout_sec, timeout_usec);
if (pkt) {
try {
pkt->unpack();
} catch (const std::exception &e) {
ExchangeStats::malformed_pkts_++;
std::cout << "Incorrect DHCP packet received"
<< e.what() << std::endl;
}
}
return (pkt);
}
bool
PerfSocket::send(const Pkt4Ptr& pkt) {
return IfaceMgr::instance().send(pkt);
}
bool
PerfSocket::send(const Pkt6Ptr& pkt) {
return IfaceMgr::instance().send(pkt);
}
IfacePtr
PerfSocket::getIface() {
return (IfaceMgr::instance().getIface(ifindex_));
}
}
}
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