--- /dev/null
+// Copyright (C) 2014 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 <dhcp/dhcp4.h>
+#include <dhcp/iface_mgr.h>
+#include <dhcp/pkt4.h>
+#include <dhcp/pkt_filter_bpf.h>
+#include <dhcp/protocol_util.h>
+#include <exceptions/exceptions.h>
+#include <algorithm>
+#include <net/bpf.h>
+#include <net/ethernet.h>
+
+namespace {
+
+using namespace isc::dhcp;
+
+/// @brief Maximum number of attempts to open BPF device.
+const unsigned int MAX_BPF_OPEN_ATTEMPTS = 100;
+
+/// The following structure defines a Berkely Packet Filter program to perform
+/// packet filtering. The program operates on Ethernet packets. To help with
+/// interpretation of the program, for the types of Ethernet packets we are
+/// interested in, the header layout is:
+///
+/// 6 bytes Destination Ethernet Address
+/// 6 bytes Source Ethernet Address
+/// 2 bytes Ethernet packet type
+///
+/// 20 bytes Fixed part of IP header
+/// variable Variable part of IP header
+///
+/// 2 bytes UDP Source port
+/// 2 bytes UDP destination port
+/// 4 bytes Rest of UDP header
+///
+/// @todo We may want to extend the filter to receive packets sent
+/// to the particular IP address assigned to the interface or
+/// broadcast address.
+struct bpf_insn dhcp_sock_filter [] = {
+ // Make sure this is an IP packet: check the half-word (two bytes)
+ // at offset 12 in the packet (the Ethernet packet type). If it
+ // is, advance to the next instruction. If not, advance 8
+ // instructions (which takes execution to the last instruction in
+ // the sequence: "drop it").
+ BPF_STMT(BPF_LD + BPF_H + BPF_ABS, ETHERNET_PACKET_TYPE_OFFSET),
+ BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ETHERTYPE_IP, 0, 8),
+
+ // Make sure it's a UDP packet. The IP protocol is at offset
+ // 9 in the IP header so, adding the Ethernet packet header size
+ // of 14 bytes gives an absolute byte offset in the packet of 23.
+ BPF_STMT(BPF_LD + BPF_B + BPF_ABS, ETHERNET_HEADER_LEN + IP_PROTO_TYPE_OFFSET),
+ BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, IPPROTO_UDP, 0, 6),
+
+ // Make sure this isn't a fragment by checking that the fragment
+ // offset field in the IP header is zero. This field is the
+ // least-significant 13 bits in the bytes at offsets 6 and 7 in
+ // the IP header, so the half-word at offset 20 (6 + size of
+ // Ethernet header) is loaded and an appropriate mask applied.
+ BPF_STMT(BPF_LD + BPF_H + BPF_ABS, ETHERNET_HEADER_LEN + IP_FLAGS_OFFSET),
+ BPF_JUMP(BPF_JMP + BPF_JSET + BPF_K, 0x1fff, 4, 0),
+
+ // Get the IP header length. This is achieved by the following
+ // (special) instruction that, given the offset of the start
+ // of the IP header (offset 14) loads the IP header length.
+ BPF_STMT(BPF_LDX + BPF_B + BPF_MSH, ETHERNET_HEADER_LEN),
+
+ // Make sure it's to the right port. The following instruction
+ // adds the previously extracted IP header length to the given
+ // offset to locate the correct byte. The given offset of 16
+ // comprises the length of the Ethernet header (14) plus the offset
+ // of the UDP destination port (2) within the UDP header.
+ BPF_STMT(BPF_LD + BPF_H + BPF_IND, ETHERNET_HEADER_LEN + UDP_DEST_PORT),
+ // The following instruction tests against the default DHCP server port,
+ // but the action port is actually set in PktFilterBPF::openSocket().
+ // N.B. The code in that method assumes that this instruction is at
+ // offset 8 in the program. If this is changed, openSocket() must be
+ // updated.
+ BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, DHCP4_SERVER_PORT, 0, 1),
+
+ // If we passed all the tests, ask for the whole packet.
+ BPF_STMT(BPF_RET + BPF_K, (u_int)-1),
+
+ // Otherwise, drop it.
+ BPF_STMT(BPF_RET + BPF_K, 0),
+};
+
+}
+
+using namespace isc::util;
+
+namespace isc {
+namespace dhcp {
+
+SocketInfo
+PktFilterBPF::openSocket(const Iface& iface,
+ const isc::asiolink::IOAddress& addr,
+ const uint16_t port, const bool,
+ const bool) {
+
+ // Open fallback socket first. If it fails, it will give us an indication
+ // that there is another service (perhaps DHCP server) running.
+ // The function will throw an exception and effectivelly cease opening
+ // the BPF device below.
+ int fallback = openFallbackSocket(addr, port);
+
+ // Fallback has opened so, let's open the BPF device that we will be
+ // using for receiving and sending packets. The BPF device is opened
+ // by opening a file /dev/bpf%d where %d is a number. There may be
+ // devices already open so we will try them one by one and open the
+ // one that is not busy.
+ int sock = -1;
+ for (unsigned int bpf_dev = 0;
+ bpf_dev < MAX_BPF_OPEN_ATTEMPTS && (sock < 0);
+ ++bpf_dev) {
+ std::ostringstream s;
+ s << "/dev/bpf" << bpf_dev;
+ sock = open(s.str().c_str(), O_RDWR, 0);
+ if (sock < 0) {
+ // If device busy, try another one.
+ if (errno == EBUSY) {
+ continue;
+ }
+ // All other errors are fatal, so close the fallback socket
+ // and throw.
+ close(fallback);
+ isc_throw(SocketConfigError, "Failed to open BPF device " << s);
+ }
+ }
+
+ // The BPF device is now open. Now it needs to be configured.
+
+ // Associate the device with the interface name.
+ struct ifreq iface_data;
+ memset(&iface_data, 0, sizeof(iface_data));
+ std::strncpy(iface_data.ifr_name, iface.getName().c_str(),
+ std::min(static_cast<int>(IFNAMSIZ),
+ static_cast<int>(iface.getName().length())));
+ if (ioctl(sock, BIOCSETIF, &iface_data) < 0) {
+ close(fallback);
+ close(sock);
+ isc_throw(SocketConfigError, "Failed to associate BPF device "
+ " with interface " << iface.getName());
+ }
+
+ // Get the BPF version supported by the kernel. Every application
+ // must check this version against the current version in use.
+ struct bpf_version ver;
+ if (ioctl(sock, BIOCVERSION, &ver) < 0) {
+ close(fallback);
+ close(sock);
+ isc_throw(SocketConfigError, "Failed to obtain the BPF version"
+ " number from the kernel");
+ }
+ // Major BPF version must match and the minor version that the kernel
+ // runs must be at least the current version in use.
+ if ((ver.bv_major != BPF_MAJOR_VERSION) ||
+ (ver.bv_minor < BPF_MINOR_VERSION)) {
+ close(fallback);
+ close(sock);
+ isc_throw(SocketConfigError, "Invalid BPF version");
+ }
+
+ // Get the size of the read buffer for this device. We will need to
+ // allocate the buffer of this size for packet reads.
+ unsigned int buf_len = 0;
+ if (ioctl(sock, BIOCGBLEN, &buf_len) < 0) {
+ close(fallback);
+ close(sock);
+ isc_throw(SocketConfigError, "Unable to obtain the required"
+ " buffer legth for reads from BPF device");
+ }
+
+ // Configure the BPF program to receive packets on the specified port.
+ dhcp_sock_filter[8].k = port;
+
+ // Set the filter program so as we only get packets we are interested in.
+ struct bpf_program prog;
+ prog.bf_insns = dhcp_sock_filter;
+ prog.bf_len = sizeof(dhcp_sock_filter) / sizeof(struct bpf_insn);
+ if (ioctl(sock, BIOCSETF, &prog) < 0) {
+ close(fallback);
+ close(sock);
+ isc_throw(SocketConfigError, "Failed to install BPF filter"
+ " program");
+ }
+
+ // Everything is ok, return the socket (BPF device descriptor) to
+ // the caller.
+ return (SocketInfo(addr, port, sock, fallback));
+}
+
+Pkt4Ptr
+PktFilterBPF::receive(const Iface&/* iface */, const SocketInfo& /*socket_info*/) {
+ return (Pkt4Ptr());
+ /* uint8_t raw_buf[IfaceMgr::RCVBUFSIZE];
+ // First let's get some data from the fallback socket. The data will be
+ // discarded but we don't want the socket buffer to bloat. We get the
+ // packets from the socket in loop but most of the time the loop will
+ // end after receiving one packet. The call to recv returns immediately
+ // when there is no data left on the socket because the socket is
+ // non-blocking.
+ // @todo In the normal conditions, both the primary socket and the fallback
+ // socket are in sync as they are set to receive packets on the same
+ // address and port. The reception of packets on the fallback socket
+ // shouldn't cause significant lags in packet reception. If we find in the
+ // future that it does, the sort of threshold could be set for the maximum
+ // bytes received on the fallback socket in a single round. Further
+ // optimizations would include an asynchronous read from the fallback socket
+ // when the DHCP server is idle.
+ int datalen;
+ do {
+ datalen = recv(socket_info.fallbackfd_, raw_buf, sizeof(raw_buf), 0);
+ } while (datalen > 0);
+
+ // Now that we finished getting data from the fallback socket, we
+ // have to get the data from the raw socket too.
+ int data_len = read(socket_info.sockfd_, raw_buf, sizeof(raw_buf));
+ // If negative value is returned by read(), it indicates that an
+ // error occured. If returned value is 0, no data was read from the
+ // socket. In both cases something has gone wrong, because we expect
+ // that a chunk of data is there. We signal the lack of data by
+ // returing an empty packet.
+ if (data_len <= 0) {
+ return Pkt4Ptr();
+ }
+
+ InputBuffer buf(raw_buf, data_len);
+
+ // @todo: This is awkward way to solve the chicken and egg problem
+ // whereby we don't know the offset where DHCP data start in the
+ // received buffer when we create the packet object. In general case,
+ // the IP header has variable length. The information about its length
+ // is stored in one of its fields. Therefore, we have to decode the
+ // packet to get the offset of the DHCP data. The dummy object is
+ // created so as we can pass it to the functions which decode IP stack
+ // and find actual offset of the DHCP data.
+ // Once we find the offset we can create another Pkt4 object from
+ // the reminder of the input buffer and set the IP addresses and
+ // ports from the dummy packet. We should consider doing it
+ // in some more elegant way.
+ Pkt4Ptr dummy_pkt = Pkt4Ptr(new Pkt4(DHCPDISCOVER, 0));
+
+ // Decode ethernet, ip and udp headers.
+ decodeEthernetHeader(buf, dummy_pkt);
+ decodeIpUdpHeader(buf, dummy_pkt);
+
+ // Read the DHCP data.
+ std::vector<uint8_t> dhcp_buf;
+ buf.readVector(dhcp_buf, buf.getLength() - buf.getPosition());
+
+ // Decode DHCP data into the Pkt4 object.
+ Pkt4Ptr pkt = Pkt4Ptr(new Pkt4(&dhcp_buf[0], dhcp_buf.size()));
+
+ // Set the appropriate packet members using data collected from
+ // the decoded headers.
+ pkt->setIndex(iface.getIndex());
+ pkt->setIface(iface.getName());
+ pkt->setLocalAddr(dummy_pkt->getLocalAddr());
+ pkt->setRemoteAddr(dummy_pkt->getRemoteAddr());
+ pkt->setLocalPort(dummy_pkt->getLocalPort());
+ pkt->setRemotePort(dummy_pkt->getRemotePort());
+ pkt->setLocalHWAddr(dummy_pkt->getLocalHWAddr());
+ pkt->setRemoteHWAddr(dummy_pkt->getRemoteHWAddr());
+
+ return (pkt); */
+}
+
+int
+PktFilterBPF::send(const Iface& /*iface*/, uint16_t /*sockfd*/, const Pkt4Ptr& /*pkt*/) {
+
+ return 0;
+
+ /* OutputBuffer buf(14);
+
+ // Some interfaces may have no HW address - e.g. loopback interface.
+ // For these interfaces the HW address length is 0. If this is the case,
+ // then we will rely on the functions which construct the IP/UDP headers
+ // to provide a default HW addres. Otherwise, create the HW address
+ // object using the HW address of the interface.
+ if (iface.getMacLen() > 0) {
+ HWAddrPtr hwaddr(new HWAddr(iface.getMac(), iface.getMacLen(),
+ iface.getHWType()));
+ pkt->setLocalHWAddr(hwaddr);
+ }
+
+
+ // Ethernet frame header.
+ // Note that we don't validate whether HW addresses in 'pkt'
+ // are valid because they are checked by the function called.
+ writeEthernetHeader(pkt, buf);
+
+ // IP and UDP header
+ writeIpUdpHeader(pkt, buf);
+
+ // DHCPv4 message
+ buf.writeData(pkt->getBuffer().getData(), pkt->getBuffer().getLength());
+
+ sockaddr_ll sa;
+ sa.sll_family = AF_PACKET;
+ sa.sll_ifindex = iface.getIndex();
+ sa.sll_protocol = htons(ETH_P_IP);
+ sa.sll_halen = 6;
+
+ int result = sendto(sockfd, buf.getData(), buf.getLength(), 0,
+ reinterpret_cast<const struct sockaddr*>(&sa),
+ sizeof(sockaddr_ll));
+ if (result < 0) {
+ isc_throw(SocketWriteError, "failed to send DHCPv4 packet, errno="
+ << errno << " (check errno.h)");
+ }
+
+ return (0);
+ */
+}
+
+
+} // end of isc::dhcp namespace
+} // end of isc namespace
--- /dev/null
+// Copyright (C) 2014 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 PKT_FILTER_BPF_H
+#define PKT_FILTER_BPF_H
+
+#include <dhcp/pkt_filter.h>
+
+#include <util/buffer.h>
+
+namespace isc {
+namespace dhcp {
+
+/// @brief Packet handling class using Berkeley Packet Filtering
+///
+/// This class provides methods to send and recive DHCPv4 messages using raw
+/// sockets and Berkeley Packet Filtering. It is used by @c isc::dhcp::IfaceMgr
+/// to send DHCPv4 messages to the hosts which don't have an IPv4 address
+/// assigned yet.
+class PktFilterBPF : public PktFilter {
+public:
+
+ /// @brief Check if packet can be sent to the host without address directly.
+ ///
+ /// This class supports direct responses to the host without address.
+ ///
+ /// @return true always.
+ virtual bool isDirectResponseSupported() const {
+ return (true);
+ }
+
+ /// @brief Open primary and fallback socket.
+ ///
+ /// @param iface Interface descriptor.
+ /// @param addr Address on the interface to be used to send packets.
+ /// @param port Port number.
+ /// @param receive_bcast Configure socket to receive broadcast messages
+ /// @param send_bcast Configure socket to send broadcast messages.
+ ///
+ /// @return A structure describing a primary and fallback socket.
+ virtual SocketInfo openSocket(const Iface& iface,
+ const isc::asiolink::IOAddress& addr,
+ const uint16_t port,
+ const bool receive_bcast,
+ const bool send_bcast);
+
+ /// @brief Receive packet over specified socket.
+ ///
+ /// @param iface interface
+ /// @param socket_info structure holding socket information
+ ///
+ /// @return Received packet
+ virtual Pkt4Ptr receive(const Iface& iface, const SocketInfo& socket_info);
+
+ /// @brief Send packet over specified socket.
+ ///
+ /// @param iface interface to be used to send packet
+ /// @param sockfd socket descriptor
+ /// @param pkt packet to be sent
+ ///
+ /// @return result of sending a packet. It is 0 if successful.
+ virtual int send(const Iface& iface, uint16_t sockfd,
+ const Pkt4Ptr& pkt);
+
+};
+
+} // namespace isc::dhcp
+} // namespace isc
+
+#endif // PKT_FILTER_BPF_H
--- /dev/null
+// Copyright (C) 2014 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/iface_mgr.h>
+#include <dhcp/pkt4.h>
+#include <dhcp/pkt_filter_bpf.h>
+#include <dhcp/protocol_util.h>
+#include <dhcp/tests/pkt_filter_test_utils.h>
+#include <util/buffer.h>
+
+#include <gtest/gtest.h>
+
+#include <sys/socket.h>
+
+using namespace isc::asiolink;
+using namespace isc::dhcp;
+using namespace isc::util;
+
+namespace {
+
+/// Port number used by tests.
+const uint16_t PORT = 10067;
+/// Size of the buffer holding received packets.
+const size_t RECV_BUF_SIZE = 2048;
+
+// Test fixture class inherits from the class common for all packet
+// filter tests.
+class PktFilterBPFTest : public isc::dhcp::test::PktFilterTest {
+public:
+ PktFilterBPFTest() : PktFilterTest(PORT) {
+ }
+};
+
+// This test verifies that the PktFilterBPF class reports its capability
+// to send packets to the host having no IP address assigned.
+TEST_F(PktFilterBPFTest, isDirectResponseSupported) {
+ // Create object under test.
+ PktFilterBPF pkt_filter;
+ // Must support direct responses.
+ EXPECT_TRUE(pkt_filter.isDirectResponseSupported());
+}
+
+// All tests below require root privileges to execute successfully. If
+// they are run as non-root user they will fail due to insufficient privileges
+// to open raw network sockets. Therefore, they should remain disabled by default
+// and "DISABLED_" tags should not be removed. If one is willing to run these
+// tests please run "make check" as root and enable execution of disabled tests
+// by setting GTEST_ALSO_RUN_DISABLED_TESTS to a value other than 0. In order
+// to run tests from this particular file, set the GTEST_FILTER environmental
+// variable to "PktFilterBPFTest.*" apart from GTEST_ALSO_RUN_DISABLED_TESTS
+// setting.
+
+// This test verifies that the raw AF_PACKET family socket can
+// be opened and bound to the specific interface.
+TEST_F(PktFilterBPFTest, DISABLED_openSocket) {
+ // Create object representing loopback interface.
+ Iface iface(ifname_, ifindex_);
+ // Set loopback address.
+ IOAddress addr("127.0.0.1");
+
+ // Try to open socket.
+ PktFilterBPF pkt_filter;
+ ASSERT_NO_THROW(
+ sock_info_ = pkt_filter.openSocket(iface, addr, PORT, false, false);
+ );
+
+ // Check that the primary socket has been opened.
+ ASSERT_GE(sock_info_.sockfd_, 0);
+ // Check that the fallback socket has been opened too.
+ ASSERT_GE(sock_info_.fallbackfd_, 0);
+
+ /* // Verify that the socket belongs to AF_PACKET family.
+ sockaddr_ll sock_address;
+ socklen_t sock_address_len = sizeof(sock_address);
+ ASSERT_EQ(0, getsockname(sock_info_.sockfd_,
+ reinterpret_cast<sockaddr*>(&sock_address),
+ &sock_address_len));
+ EXPECT_EQ(AF_PACKET, sock_address.sll_family);
+
+ // Verify that the socket is bound to appropriate interface.
+ EXPECT_EQ(ifindex_, sock_address.sll_ifindex);
+
+ // Verify that the socket has SOCK_RAW type.
+ int sock_type;
+ socklen_t sock_type_len = sizeof(sock_type);
+ ASSERT_EQ(0, getsockopt(sock_info_.sockfd_, SOL_SOCKET, SO_TYPE,
+ &sock_type, &sock_type_len));
+ EXPECT_EQ(SOCK_RAW, sock_type); */
+}
+
+// This test verifies correctness of sending DHCP packet through the raw
+// socket, whereby all IP stack headers are hand-crafted.
+TEST_F(PktFilterBPFTest, DISABLED_send) {
+ /* // Packet will be sent over loopback interface.
+ Iface iface(ifname_, ifindex_);
+ IOAddress addr("127.0.0.1");
+
+ // Create an instance of the class which we are testing.
+ PktFilterBPF pkt_filter;
+ // Open socket. We don't check that the socket has appropriate
+ // options and family set because we have checked that in the
+ // openSocket test already.
+
+ sock_info_ = pkt_filter.openSocket(iface, addr, PORT, false, false);
+
+ ASSERT_GE(sock_info_.sockfd_, 0);
+
+ // Send the packet over the socket.
+ ASSERT_NO_THROW(pkt_filter.send(iface, sock_info_.sockfd_, test_message_));
+
+ // Read the data from socket.
+ fd_set readfds;
+ FD_ZERO(&readfds);
+ FD_SET(sock_info_.sockfd_, &readfds);
+
+ struct timeval timeout;
+ timeout.tv_sec = 5;
+ timeout.tv_usec = 0;
+ int result = select(sock_info_.sockfd_ + 1, &readfds, NULL, NULL, &timeout);
+ // We should receive some data from loopback interface.
+ ASSERT_GT(result, 0);
+
+ // Get the actual data.
+ uint8_t rcv_buf[RECV_BUF_SIZE];
+ result = recv(sock_info_.sockfd_, rcv_buf, RECV_BUF_SIZE, 0);
+ ASSERT_GT(result, 0);
+
+ Pkt4Ptr dummy_pkt = Pkt4Ptr(new Pkt4(DHCPDISCOVER, 0));
+
+ InputBuffer buf(rcv_buf, result);
+
+ // Decode ethernet, ip and udp headers.
+ decodeEthernetHeader(buf, dummy_pkt);
+ decodeIpUdpHeader(buf, dummy_pkt);
+
+ // Create the DHCPv4 packet from the received data.
+ std::vector<uint8_t> dhcp_buf;
+ buf.readVector(dhcp_buf, buf.getLength() - buf.getPosition());
+ Pkt4Ptr rcvd_pkt(new Pkt4(&dhcp_buf[0], dhcp_buf.size()));
+ ASSERT_TRUE(rcvd_pkt);
+
+ // Parse the packet.
+ ASSERT_NO_THROW(rcvd_pkt->unpack());
+
+ // Check if the received message is correct.
+ testRcvdMessage(rcvd_pkt); */
+}
+
+// This test verifies correctness of reception of the DHCP packet over
+// raw socket, whereby all IP stack headers are hand-crafted.
+TEST_F(PktFilterBPFTest, DISABLED_receive) {
+
+ // Packet will be received over loopback interface.
+ Iface iface(ifname_, ifindex_);
+ IOAddress addr("127.0.0.1");
+
+ // Create an instance of the class which we are testing.
+ PktFilterBPF pkt_filter;
+ // Open socket. We don't check that the socket has appropriate
+ // options and family set because we have checked that in the
+ // openSocket test already.
+ sock_info_ = pkt_filter.openSocket(iface, addr, PORT, false, false);
+ ASSERT_GE(sock_info_.sockfd_, 0);
+
+ // Send DHCPv4 message to the local loopback address and server's port.
+ sendMessage();
+
+ // Receive the packet using LPF packet filter.
+ Pkt4Ptr rcvd_pkt = pkt_filter.receive(iface, sock_info_);
+ // Check that the packet has been correctly received.
+ ASSERT_TRUE(rcvd_pkt);
+
+ // Parse the packet.
+ ASSERT_NO_THROW(rcvd_pkt->unpack());
+
+ // Check if the received message is correct.
+ testRcvdMessage(rcvd_pkt);
+}
+
+} // anonymous namespace
projects / thirdparty / kea.git / commitdiff
