[master] Merge branch 'trac4106'

src/bin/dhcp4/Makefile.am

@@ -62,6 +62,7 @@ libdhcp4_la_SOURCES += ctrl_dhcp4_srv.cc ctrl_dhcp4_srv.h
 libdhcp4_la_SOURCES += json_config_parser.cc json_config_parser.h
 libdhcp4_la_SOURCES += dhcp4_log.cc dhcp4_log.h
 libdhcp4_la_SOURCES += dhcp4_srv.cc dhcp4_srv.h
+libdhcp4_la_SOURCES += dhcp4_dhcp4o6_ipc.cc dhcp4_dhcp4o6_ipc.h
 
 libdhcp4_la_SOURCES += kea_controller.cc
 

src/bin/dhcp4/ctrl_dhcp4_srv.cc

@@ -16,6 +16,7 @@
 #include <cc/data.h>
 #include <dhcp4/ctrl_dhcp4_srv.h>
 #include <dhcp4/dhcp4_log.h>
+#include <dhcp4/dhcp4_dhcp4o6_ipc.h>
 #include <hooks/hooks_manager.h>
 #include <dhcp4/json_config_parser.h>
 #include <dhcpsrv/cfgmgr.h>
@@ -185,6 +186,16 @@ ControlledDhcpv4Srv::processConfig(isc::data::ConstElementPtr config) {
         return (isc::config::createAnswer(1, err.str()));
     }
 
+    // Setup DHCPv4-over-DHCPv6 IPC
+    try {
+        Dhcp4to6Ipc::instance().open();
+    } catch (const std::exception& ex) {
+        std::ostringstream err;
+        err << "error starting DHCPv4-over-DHCPv6 IPC "
+               " after server reconfiguration: " << ex.what();
+        return (isc::config::createAnswer(1, err.str()));
+    }
+
     // Configuration may change active interfaces. Therefore, we have to reopen
     // sockets according to new configuration. It is possible that this
     // operation will fail for some interfaces but the openSockets function

src/bin/dhcp4/dhcp4_dhcp4o6_ipc.cc

+// Copyright (C) 2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+#include <config.h>
+
+#include <util/buffer.h>
+#include <dhcp/iface_mgr.h>
+#include <dhcpsrv/cfgmgr.h>
+#include <dhcp4/dhcp4_dhcp4o6_ipc.h>
+
+using namespace std;
+
+namespace isc {
+namespace dhcp {
+
+Dhcp4to6Ipc::Dhcp4to6Ipc() : Dhcp4o6IpcBase() {
+}
+
+Dhcp4to6Ipc& Dhcp4to6Ipc::instance() {
+    static Dhcp4to6Ipc dhcp4to6_ipc;
+    return (dhcp4to6_ipc);
+}
+
+void Dhcp4to6Ipc::open() {
+    uint32_t port = CfgMgr::instance().getStagingCfg()->getDhcp4o6Port();
+    if (port == 0) {
+        Dhcp4o6IpcBase::close();
+        return;
+    }
+
+    int old_fd = socket_fd_;
+    socket_fd_ = Dhcp4o6IpcBase::open(static_cast<uint16_t>(port), ENDPOINT_TYPE_V4);
+    if ((old_fd == -1) && (socket_fd_ != old_fd)) {
+        IfaceMgr::instance().addExternalSocket(socket_fd_, Dhcp4to6Ipc::handler);
+    }
+}
+
+void Dhcp4to6Ipc::handler() {
+    Dhcp4to6Ipc& ipc = Dhcp4to6Ipc::instance();
+
+    // Reset received message in case we return from this method before the
+    // received message pointer is updated.
+    ipc.received_.reset();
+
+    // Receive message from the IPC socket.
+    Pkt6Ptr pkt = ipc.receive();
+    if (!pkt) {
+        return;
+    }
+
+    // Each message must contain option holding DHCPv4 message.
+    OptionCollection msgs = pkt->getOptions(D6O_DHCPV4_MSG);
+    if (msgs.empty()) {
+        isc_throw(Dhcp4o6IpcError, "DHCPv4 message option not present in the"
+                  " DHCPv4o6 message received by the DHCPv4 server");
+
+    } else if (msgs.size() > 1) {
+        isc_throw(Dhcp4o6IpcError, "expected exactly one DHCPv4 message within"
+                  " DHCPv4 message option received by the DHCPv4 server");
+    }
+
+    OptionPtr msg = msgs.begin()->second;
+    if (!msg) {
+        isc_throw(Dhcp4o6IpcError, "null DHCPv4 message option in the"
+                  " DHCPv4o6 message received by the DHCPv4 server");
+    }
+
+    // Record this message.
+    ipc.received_.reset(new Pkt4o6(msg->getData(), pkt));
+}
+
+Pkt4o6Ptr& Dhcp4to6Ipc::getReceived() {
+    return (received_);
+}
+
+};  // namespace dhcp
+
+};  // namespace isc

src/bin/dhcp4/dhcp4_dhcp4o6_ipc.h

+// Copyright (C) 2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+#ifndef DHCP4_DHCP4O6_IPC_H
+#define DHCP4_DHCP4O6_IPC_H
+
+/// @file dhcp4_dhcp4o6_ipc.h Defines the Dhcp4o6Ipc class.
+/// This file defines the class Kea uses to act as the DHCPv4 server
+/// side of DHCPv4-over-DHCPv6 communication between servers.
+///
+
+#include <dhcp/pkt4o6.h>
+#include <dhcpsrv/dhcp4o6_ipc.h>
+#include <boost/shared_ptr.hpp>
+
+namespace isc {
+namespace dhcp {
+
+/// @brief Handles DHCPv4-over-DHCPv6 IPC on the DHCPv4 server side
+class Dhcp4to6Ipc : public Dhcp4o6IpcBase {
+protected:
+    /// @brief Constructor
+    ///
+    /// Default constructor
+    Dhcp4to6Ipc();
+
+    /// @brief Destructor.
+    virtual ~Dhcp4to6Ipc() { }
+
+public:
+    /// @brief Returns pointer to the sole instance of Dhcp4o6Ipc
+    ///
+    /// Dhcp4to6Ipc is a singleton class
+    ///
+    /// @return the only existing instance of DHCP4o6 IPC
+    static Dhcp4to6Ipc& instance();
+
+    /// @brief Open communication socket
+    ///
+    /// Call base open method and sets the handler/callback when needed
+    virtual void open();
+
+    /// @brief On receive handler
+    ///
+    /// The handler processes the DHCPv4-query DHCPv6 packet and
+    /// sends the DHCPv4-response DHCPv6 packet back to the DHCPv6 server
+    static void handler();
+
+    /// @brief Returns last received packet
+    ///
+    /// @return a reference to a shared pointer to the last received packet
+    /// @note This reference should be cleared after use
+    Pkt4o6Ptr& getReceived();
+
+private:
+    /// @brief last received packet
+    Pkt4o6Ptr received_;
+};
+
+} // namespace isc
+} // namespace dhcp
+
+#endif

src/bin/dhcp4/json_config_parser.cc

@@ -422,9 +422,10 @@ DhcpConfigParser* createGlobalDhcp4ConfigParser(const std::string& config_id,
     if ((config_id.compare("valid-lifetime") == 0)  ||
         (config_id.compare("renew-timer") == 0)  ||
         (config_id.compare("rebind-timer") == 0) ||
-        (config_id.compare("decline-probation-period") == 0) )  {
+        (config_id.compare("decline-probation-period") == 0) ||
+        (config_id.compare("dhcp4o6-port") == 0) )  {
         parser = new Uint32Parser(config_id,
-                                 globalContext()->uint32_values_);
+                                  globalContext()->uint32_values_);
     } else if (config_id.compare("interfaces-config") == 0) {
         parser = new IfacesConfigParser4();
     } else if (config_id.compare("subnet4") == 0) {
@@ -472,6 +473,7 @@ DhcpConfigParser* createGlobalDhcp4ConfigParser(const std::string& config_id,
 ///
 /// - echo-client-id
 /// - decline-probation-period
+/// - dhcp4o6-port
 void setGlobalParameters4() {
     // Although the function is modest for now, it is certain that the number
     // of global switches will increase over time, hence the name.
@@ -494,6 +496,15 @@ void setGlobalParameters4() {
     } catch (...) {
         // That's not really needed.
     }
+
+    // Set the DHCPv4-over-DHCPv6 interserver port.
+    try {
+        uint32_t dhcp4o6_port = globalContext()->uint32_values_
+            ->getOptionalParam("dhcp4o6-port", 0);
+        CfgMgr::instance().getStagingCfg()->setDhcp4o6Port(dhcp4o6_port);
+    } catch (...) {
+        // Ignore errors. This flag is optional
+    }
 }
 
 isc::data::ConstElementPtr

src/bin/dhcp4/tests/Makefile.am

@@ -92,6 +92,7 @@ dhcp4_unittests_SOURCES += release_unittest.cc
 dhcp4_unittests_SOURCES += out_of_range_unittest.cc
 dhcp4_unittests_SOURCES += decline_unittest.cc
 dhcp4_unittests_SOURCES += kea_controller_unittest.cc
+dhcp4_unittests_SOURCES += dhcp4_dhcp4o6_ipc_unittest.cc
 
 nodist_dhcp4_unittests_SOURCES = marker_file.h test_libraries.h
 

src/bin/dhcp4/tests/dhcp4_dhcp4o6_ipc_unittest.cc

+// Copyright (C) 2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+#include <config.h>
+#include <asiolink/io_address.h>
+#include <dhcp/pkt4o6.h>
+#include <dhcp/pkt6.h>
+#include <dhcp/tests/iface_mgr_test_config.h>
+#include <dhcp4/dhcp4_dhcp4o6_ipc.h>
+#include <dhcpsrv/cfgmgr.h>
+#include <dhcpsrv/testutils/dhcp4o6_test_ipc.h>
+#include <gtest/gtest.h>
+#include <stdint.h>
+
+using namespace isc;
+using namespace isc::asiolink;
+using namespace isc::dhcp;
+using namespace isc::dhcp::test;
+using namespace isc::util;
+
+namespace {
+
+/// @brief Port number used in tests.
+const uint16_t TEST_PORT = 32000;
+
+/// @brief Define short name for the test IPC.
+typedef Dhcp4o6TestIpc TestIpc;
+
+/// @brief Test fixture class for DHCPv4 endpoint of DHCPv4o6 IPC.
+class Dhcp4to6IpcTest : public ::testing::Test {
+public:
+
+    /// @brief Constructor
+    ///
+    /// Configures IPC to use a test port. It also provides a fake
+    /// configuration of interfaces.
+    Dhcp4to6IpcTest()
+        : iface_mgr_test_config_(true) {
+        configurePort(TEST_PORT);
+    }
+
+    /// @brief Configure DHCP4o6 port.
+    ///
+    /// @param port New port.
+    void configurePort(const uint16_t port);
+
+    /// @brief Creates an instance of the DHCPv4o6 Message option.
+    ///
+    /// @return Pointer to the instance of the DHCPv4-query Message option.
+    OptionPtr createDHCPv4MsgOption() const;
+
+private:
+
+    /// @brief Provides fake configuration of interfaces.
+    IfaceMgrTestConfig iface_mgr_test_config_;
+
+};
+
+void
+Dhcp4to6IpcTest::configurePort(const uint16_t port) {
+    CfgMgr::instance().getStagingCfg()->setDhcp4o6Port(port);
+}
+
+OptionPtr
+Dhcp4to6IpcTest::createDHCPv4MsgOption() const {
+    // Create the DHCPv4 message.
+    Pkt4Ptr pkt(new Pkt4(DHCPREQUEST, 1234));
+    // Make a wire representation of the DHCPv4 message.
+    pkt->pack();
+    OutputBuffer& output_buffer = pkt->getBuffer();
+    const uint8_t* data = static_cast<const uint8_t*>(output_buffer.getData());
+    OptionBuffer option_buffer(data, data + output_buffer.getLength());
+
+    // Create the DHCPv4 Message option holding the created message.
+    OptionPtr opt_msg(new Option(Option::V6, D6O_DHCPV4_MSG, option_buffer));
+    return (opt_msg);
+}
+
+// This test verifies that the DHCPv4 endpoint of the DHCPv4o6 IPC can
+// receive messages.
+TEST_F(Dhcp4to6IpcTest, receive) {
+    // Create instance of the IPC endpoint under test.
+    Dhcp4to6Ipc& ipc = Dhcp4to6Ipc::instance();
+    // Create instance of the IPC endpoint being used as a source of messages.
+    TestIpc src_ipc(TEST_PORT, TestIpc::ENDPOINT_TYPE_V6);
+
+    // Open both endpoints.
+    ASSERT_NO_THROW(ipc.open());
+    ASSERT_NO_THROW(src_ipc.open());
+
+    // Create message to be sent over IPC.
+    Pkt6Ptr pkt(new Pkt6(DHCPV6_DHCPV4_QUERY, 1234));
+    pkt->addOption(createDHCPv4MsgOption());
+    pkt->setIface("eth0");
+    pkt->setRemoteAddr(IOAddress("2001:db8:1::123"));
+    ASSERT_NO_THROW(pkt->pack());
+
+    // Send and wait up to 1 second to receive it.
+    ASSERT_NO_THROW(src_ipc.send(pkt));
+    ASSERT_NO_THROW(IfaceMgr::instance().receive6(1, 0));
+
+    // Make sure that the message has been received.
+    Pkt4o6Ptr pkt_received = ipc.getReceived();
+    ASSERT_TRUE(pkt_received);
+    Pkt6Ptr pkt6_received = pkt_received->getPkt6();
+    ASSERT_TRUE(pkt6_received);
+    EXPECT_EQ("eth0", pkt6_received->getIface());
+    EXPECT_EQ("2001:db8:1::123", pkt6_received->getRemoteAddr().toText());
+}
+
+// This test verifies that message with multiple DHCPv4 query options
+// is rejected.
+TEST_F(Dhcp4to6IpcTest, receiveMultipleQueries) {
+    // Create instance of the IPC endpoint under test.
+    Dhcp4to6Ipc& ipc = Dhcp4to6Ipc::instance();
+    // Create instance of the IPC endpoint being used as a source of messages.
+    TestIpc src_ipc(TEST_PORT, TestIpc::ENDPOINT_TYPE_V6);
+
+    // Open both endpoints.
+    ASSERT_NO_THROW(ipc.open());
+    ASSERT_NO_THROW(src_ipc.open());
+
+    // Create message to be sent over IPC.
+    Pkt6Ptr pkt(new Pkt6(DHCPV6_DHCPV4_QUERY, 1234));
+    // Add two DHCPv4 query options.
+    pkt->addOption(createDHCPv4MsgOption());
+    pkt->addOption(createDHCPv4MsgOption());
+    pkt->setIface("eth0");
+    pkt->setRemoteAddr(IOAddress("2001:db8:1::123"));
+    ASSERT_NO_THROW(pkt->pack());
+
+    // Send message.
+    ASSERT_NO_THROW(src_ipc.send(pkt));
+    // Reception handler should throw exception.
+    EXPECT_THROW(IfaceMgr::instance().receive6(1, 0), Dhcp4o6IpcError);
+}
+
+// This test verifies that message with no DHCPv4 query options is rejected.
+TEST_F(Dhcp4to6IpcTest, receiveNoQueries) {
+    // Create instance of the IPC endpoint under test.
+    Dhcp4to6Ipc& ipc = Dhcp4to6Ipc::instance();
+    // Create instance of the IPC endpoint being used as a source of messages.
+    TestIpc src_ipc(TEST_PORT, TestIpc::ENDPOINT_TYPE_V6);
+
+    // Open both endpoints.
+    ASSERT_NO_THROW(ipc.open());
+    ASSERT_NO_THROW(src_ipc.open());
+
+    // Create message to be sent over IPC without DHCPv4 query option.
+    Pkt6Ptr pkt(new Pkt6(DHCPV6_DHCPV4_QUERY, 1234));
+    pkt->setIface("eth0");
+    pkt->setRemoteAddr(IOAddress("2001:db8:1::123"));
+    ASSERT_NO_THROW(pkt->pack());
+
+    // Send message.
+    ASSERT_NO_THROW(src_ipc.send(pkt));
+    // Reception handler should throw exception.
+    EXPECT_THROW(IfaceMgr::instance().receive6(1, 0), Dhcp4o6IpcError);
+}
+
+
+} // end of anonymous namespace

src/bin/dhcp6/Makefile.am

@@ -63,6 +63,7 @@ libdhcp6_la_SOURCES += dhcp6_log.cc dhcp6_log.h
 libdhcp6_la_SOURCES += dhcp6_srv.cc dhcp6_srv.h
 libdhcp6_la_SOURCES += ctrl_dhcp6_srv.cc ctrl_dhcp6_srv.h
 libdhcp6_la_SOURCES += json_config_parser.cc json_config_parser.h
+libdhcp6_la_SOURCES += dhcp6_dhcp4o6_ipc.cc dhcp6_dhcp4o6_ipc.h
 
 libdhcp6_la_SOURCES += kea_controller.cc
 

src/bin/dhcp6/ctrl_dhcp6_srv.cc

@@ -18,6 +18,7 @@
 #include <dhcp/libdhcp++.h>
 #include <dhcpsrv/cfgmgr.h>
 #include <dhcp6/ctrl_dhcp6_srv.h>
+#include <dhcp6/dhcp6_dhcp4o6_ipc.h>
 #include <dhcp6/dhcp6_log.h>
 #include <dhcp6/json_config_parser.h>
 #include <hooks/hooks_manager.h>
@@ -209,6 +210,16 @@ ControlledDhcpv6Srv::processConfig(isc::data::ConstElementPtr config) {
         return (isc::config::createAnswer(1, err.str()));
     }
 
+    // Setup DHCPv4-over-DHCPv6 IPC
+    try {
+        Dhcp6to4Ipc::instance().open();
+    } catch (const std::exception& ex) {
+        std::ostringstream err;
+        err << "error starting DHCPv4-over-DHCPv6 IPC "
+               " after server reconfiguration: " << ex.what();
+        return (isc::config::createAnswer(1, err.str()));
+    }
+
     // Configuration may change active interfaces. Therefore, we have to reopen
     // sockets according to new configuration. It is possible that this
     // operation will fail for some interfaces but the openSockets function

src/bin/dhcp6/dhcp6_dhcp4o6_ipc.cc

+// Copyright (C) 2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+
+#include <config.h>
+
+#include <util/buffer.h>
+#include <dhcp/iface_mgr.h>
+#include <dhcpsrv/cfgmgr.h>
+#include <dhcp6/dhcp6_dhcp4o6_ipc.h>
+
+using namespace std;
+
+namespace isc {
+namespace dhcp {
+
+Dhcp6to4Ipc::Dhcp6to4Ipc() : Dhcp4o6IpcBase() {}
+
+Dhcp6to4Ipc& Dhcp6to4Ipc::instance() {
+    static Dhcp6to4Ipc dhcp6to4_ipc;
+    return (dhcp6to4_ipc);
+}
+
+void Dhcp6to4Ipc::open() {
+    uint32_t port = CfgMgr::instance().getStagingCfg()->getDhcp4o6Port();
+    if (port == 0) {
+        Dhcp4o6IpcBase::close();
+        return;
+    }
+
+    int old_fd = socket_fd_;
+    socket_fd_ = Dhcp4o6IpcBase::open(static_cast<uint16_t>(port), ENDPOINT_TYPE_V6);
+    if ((old_fd == -1) && (socket_fd_ != old_fd)) {
+        IfaceMgr::instance().addExternalSocket(socket_fd_, Dhcp6to4Ipc::handler);
+    }
+}
+
+void Dhcp6to4Ipc::handler() {
+    Dhcp6to4Ipc& ipc = Dhcp6to4Ipc::instance();
+
+    // Receive message from IPC.
+    Pkt6Ptr pkt = ipc.receive();
+    if (!pkt) {
+        return;
+    }
+
+    // The received message has been unpacked by the receive() function. This
+    // method could have modified the message so it's better to pack() it
+    // again because we'll be forwarding it to a client.
+    isc::util::OutputBuffer& buf = pkt->getBuffer();
+    buf.clear();
+    pkt->pack();
+
+    uint8_t msg_type = pkt->getType();
+    if ((msg_type == DHCPV6_RELAY_FORW) || (msg_type == DHCPV6_RELAY_REPL)) {
+        pkt->setRemotePort(DHCP6_SERVER_PORT);
+    } else {
+        pkt->setRemotePort(DHCP6_CLIENT_PORT);
+    }
+
+    // Forward packet to the client.
+    IfaceMgr::instance().send(pkt);
+    // processStatsSent(pkt);
+}
+
+};  // namespace dhcp
+
+};  // namespace isc

src/bin/dhcp6/dhcp6_dhcp4o6_ipc.h

+// Copyright (C) 2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+#ifndef DHCP6_DHCP4O6_IPC_H
+#define DHCP6_DHCP4O6_IPC_H
+
+/// @file dhcp6_dhcp4o6_ipc.h Defines the Dhcp4o6Ipc class.
+/// This file defines the class Kea uses to act as the DHCPv6 server
+/// side of DHCPv4-over-DHCPv6 communication between servers.
+///
+#include <dhcpsrv/dhcp4o6_ipc.h>
+#include <boost/shared_ptr.hpp>
+
+namespace isc {
+namespace dhcp {
+
+/// @brief Handles DHCPv4-over-DHCPv6 IPC on the DHCPv6 server side
+class Dhcp6to4Ipc : public Dhcp4o6IpcBase {
+protected:
+    /// @brief Constructor
+    ///
+    /// Default constructor
+    Dhcp6to4Ipc();
+
+    /// @brief Destructor.
+    virtual ~Dhcp6to4Ipc() { }
+
+public:
+    /// @brief Returns pointer to the sole instance of Dhcp4o6Ipc
+    ///
+    /// Dhcp4o6Ipc is a singleton class
+    ///
+    /// @return the only existing instance of DHCP4o6 IPC
+    static Dhcp6to4Ipc& instance();
+
+    /// @brief Open communication socket
+    ///
+    /// Call base open method and sets the handler/callback when needed
+    virtual void open();
+
+    /// @brief On receive handler
+    ///
+    /// The handler sends the DHCPv6 packet back to the remote address
+    static void handler();
+};
+