Commit 7097e81a authored by Marcin Siodelski's avatar Marcin Siodelski
Browse files

[4106] Added a set of tests for sending message over IPC.

parent afad9d6d
......@@ -22,6 +22,7 @@
#include <dhcp/option_vendor.h>
#include <dhcpsrv/dhcp4o6_ipc.h>
#include <errno.h>
#include <netinet/in.h>
#include <string>
......@@ -192,14 +193,17 @@ Pkt6Ptr Dhcp4o6IpcBase::receive() {
}
void Dhcp4o6IpcBase::send(const Pkt6Ptr& pkt) {
// No packet: nothing to send
// This shouldn't happen, i.e. send() shouldn't be called if there is
// no message.
if (!pkt) {
return;
isc_throw(Dhcp4o6IpcError, "DHCP4o6 message must not be NULL while"
" trying to send it over the IPC");
}
// Disabled: nowhere to send
if (socket_fd_ == -1) {
return;
isc_throw(Dhcp4o6IpcError, "unable to send DHCP4o6 message because"
" IPC socket is closed");
}
// Get a vendor option
......@@ -218,10 +222,12 @@ void Dhcp4o6IpcBase::send(const Pkt6Ptr& pkt) {
buf.clear();
pkt->pack();
// Send
static_cast<void>(::send(socket_fd_, buf.getData(), buf.getLength(), 0));
// Try to send the message.
if (::send(socket_fd_, buf.getData(), buf.getLength(), 0) < 0) {
isc_throw(Dhcp4o6IpcError, "failed to send DHCP4o6 message over the IPC: "
<< strerror(errno));
}
return;
}
}; // namespace dhcp
......
......@@ -22,6 +22,7 @@
#include <dhcp/option_vendor.h>
#include <dhcpsrv/dhcp4o6_ipc.h>
#include <boost/bind.hpp>
#include <boost/function.hpp>
#include <gtest/gtest.h>
#include <sstream>
#include <string>
......@@ -45,6 +46,9 @@ const int ENDPOINT_TYPE_V4 = 4;
/// @brief Defines the DHCPv6 endpoint of IPC.
const int ENDPOINT_TYPE_V6 = 6;
/// @brief Type definition for the function creating DHCP message.
typedef boost::function<Pkt6Ptr(const uint16_t, const uint16_t)> CreateMsgFun;
/// @brief Implements a simple IPC for the test.
class TestIpc : public Dhcp4o6IpcBase {
public:
......@@ -150,14 +154,42 @@ protected:
/// @param prefix Prefix.
/// @param postfix Postfix.
/// @return String representing concatenated prefix and postfix.
std::string concatenate(const std::string& prefix,
const uint16_t postfix) const;
static std::string concatenate(const std::string& prefix, const uint16_t postfix);
/// @brief Creates an instance of the DHCPv4o6 message.
////
/// @param msg_type Message type.
/// @param postfix Postfix to be appended to the remote address. For example,
/// for postfix = 5 the resulting remote address will be 2001:db8:1::5.
/// The postifx value is also used to generate the postfix for the interface.
/// The possible interface names are "eth0" and "eth1". For even postfix values
/// the "eth0" will be used, for odd postfix values "eth1" will be used.
///
/// @return Pointer to the created message.
static Pkt6Ptr createDHCPv4o6Message(const uint16_t msg_type,
const uint16_t postfix = 0);
/// @brief Creates an instance of the DHCPv4o6 message with vendor option.
///
/// The vendor option appended to the message has ISC entprise id and
/// comprises option @c ISC_V6_4O6_INTERFACE and @c ISC_V6_4O6_SRC_ADDRESS.
/// This is useful to test scenarios when the IPC is forwarding messages
/// that contain options also inserted by IPC. The duplicate options are
/// allowed and IPC should deal with this with no error.
///
/// @param msg_type Message type.
/// @param postfix Postfix to be appended to the remote address. See the
/// documentation of @c createDHCPv4o6Message for details.
///
/// @return Pointer to the created message.
static Pkt6Ptr createDHCPv4o6MsgWithVendorOption(const uint16_t msg_type,
const uint16_t postfix);
/// @brief Creates an instance of the DHCPv4-query Message option.
///
/// @param src Type of the source endpoint. It can be 4 or 6.
/// @return Pointer to the instance of the DHCPv4-query Message option.
OptionPtr createDHCPv4MsgOption(const int src) const;
static OptionPtr createDHCPv4MsgOption(const int src);
/// @brief Tests sending and receiving packets over the IPC.
///
......@@ -165,7 +197,7 @@ protected:
/// @param src Type of the source IPC endpoint. It can be 4 or 6.
/// @param dest Type of the destination IPC endpoint. It can be 4 or 6.
void testSendReceive(const uint16_t iterations_num, const int src,
const int dest);
const int dest, const CreateMsgFun& create_msg_fun);
/// @brief Tests that error is reported when invalid message is received.
///
......@@ -185,14 +217,68 @@ Dhcp4o6IpcBaseTest::Dhcp4o6IpcBaseTest()
std::string
Dhcp4o6IpcBaseTest::concatenate(const std::string& prefix,
const uint16_t postfix) const {
const uint16_t postfix) {
std::ostringstream s;
s << prefix << postfix;
return (s.str());
}
Pkt6Ptr
Dhcp4o6IpcBaseTest::createDHCPv4o6Message(const uint16_t msg_type,
const uint16_t postfix) {
// Create the DHCPv4o6 message.
Pkt6Ptr pkt(new Pkt6(msg_type, 0));
// The interface name is carried in the dedicated option between
// the servers. The receiving server will check that such interface
// is present in the system. The fake configuration we're using for
// this test includes two interfaces: "eth0" and "eth1". Therefore,
// we pick one or another, depending on the index of the interation.
pkt->setIface(concatenate("eth", postfix % 2));
// The remote address of the sender of the DHCPv6 packet is carried
// between the servers in the dedicated option. We use different
// address for each iteration to make sure that the IPC delivers the
// right address.
pkt->setRemoteAddr(IOAddress(concatenate("2001:db8:1::", postfix)));
// Determine the endpoint type using the message type.
const int src = (msg_type == DHCPV6_DHCPV4_QUERY) ?
ENDPOINT_TYPE_V6 : ENDPOINT_TYPE_V4;
// Add DHCPv4 Message option to make sure it is conveyed by the IPC.
pkt->addOption(createDHCPv4MsgOption(src));
return (pkt);
}
Pkt6Ptr
Dhcp4o6IpcBaseTest::createDHCPv4o6MsgWithVendorOption(const uint16_t msg_type,
const uint16_t postfix) {
Pkt6Ptr pkt = createDHCPv4o6Message(msg_type, postfix);
// Create vendor option with ISC enterprise id.
OptionVendorPtr option_vendor(new OptionVendor(Option::V6, ENTERPRISE_ID_ISC));
// Add interface. Such interface doesn't have to exist in the system because
// IPC should not use this option when it is received. It should rather use
// the option that the sender side is appending to the message.
option_vendor->addOption(OptionStringPtr(new OptionString(Option::V6,
ISC_V6_4O6_INTERFACE,
"non-existing")));
// Add some remote address.
option_vendor->addOption(Option6AddrLstPtr(new Option6AddrLst(ISC_V6_4O6_SRC_ADDRESS,
IOAddress("3000::10"))));
// Add vendor option to the message.
pkt->addOption(option_vendor);
return (pkt);
}
OptionPtr
Dhcp4o6IpcBaseTest::createDHCPv4MsgOption(const int src) const {
Dhcp4o6IpcBaseTest::createDHCPv4MsgOption(const int src) {
// Create the DHCPv4 message.
Pkt4Ptr pkt(new Pkt4(src == ENDPOINT_TYPE_V4 ? DHCPACK : DHCPREQUEST,
1234));
......@@ -207,11 +293,10 @@ Dhcp4o6IpcBaseTest::createDHCPv4MsgOption(const int src) const {
return (opt_msg);
}
void
Dhcp4o6IpcBaseTest::testSendReceive(const uint16_t iterations_num,
const int src,
const int dest) {
const int src, const int dest,
const CreateMsgFun& create_msg_fun) {
// Create IPC instances representing the source and destination endpoints.
TestIpc ipc_src(TEST_PORT, src);
TestIpc ipc_dest(TEST_PORT, dest);
......@@ -229,23 +314,7 @@ Dhcp4o6IpcBaseTest::testSendReceive(const uint16_t iterations_num,
// Send the number of messages configured for the test.
for (uint16_t i = 1; i <= iterations_num; ++i) {
// Create the DHCPv4o6 message.
Pkt6Ptr pkt(new Pkt6(msg_type, 0));
// The interface name is carried in the dedicated option between
// the servers. The receiving server will check that such interface
// is present in the system. The fake configuration we're using for
// this test includes two interfaces: "eth0" and "eth1". Therefore,
// we pick one or another, depending on the index of the interation.
pkt->setIface(concatenate("eth", i % 2));
// The remote address of the sender of the DHCPv6 packet is carried
// between the servers in the dedicated option. We use different
// address for each iteration to make sure that the IPC delivers the
// right address.
pkt->setRemoteAddr(IOAddress(concatenate("2001:db8:1::", i)));
// Add DHCPv4 Message option to make sure it is conveyed by the IPC.
pkt->addOption(createDHCPv4MsgOption(src));
Pkt6Ptr pkt = create_msg_fun(msg_type, i);
// Actaully send the message through the IPC.
ASSERT_NO_THROW(ipc_src.send(pkt))
......@@ -254,6 +323,7 @@ Dhcp4o6IpcBaseTest::testSendReceive(const uint16_t iterations_num,
// Try to receive all messages.
for (uint16_t i = 1; i <= iterations_num; ++i) {
// Call receive with a timeout. The data should appear on the socket
// within this time.
ASSERT_NO_THROW(IfaceMgr::instance().receive6(1, 0));
......@@ -306,13 +376,20 @@ Dhcp4o6IpcBaseTest::testReceiveError(const Pkt6Ptr& pkt) {
// This test verifies that the IPC can transmit messages between the
// DHCPv6 and DHCPv4 server.
TEST_F(Dhcp4o6IpcBaseTest, send4To6) {
testSendReceive(TEST_ITERATIONS, ENDPOINT_TYPE_V4, ENDPOINT_TYPE_V6);
testSendReceive(TEST_ITERATIONS, ENDPOINT_TYPE_V4, ENDPOINT_TYPE_V6,
&createDHCPv4o6Message);
}
// This test verifies taht the IPC can transmit messages between the
// DHCPv4 and DHCPv6 server.
TEST_F(Dhcp4o6IpcBaseTest, send6To4) {
testSendReceive(TEST_ITERATIONS, ENDPOINT_TYPE_V6, ENDPOINT_TYPE_V4);
testSendReceive(TEST_ITERATIONS, ENDPOINT_TYPE_V6, ENDPOINT_TYPE_V4,
&createDHCPv4o6Message);
}
TEST_F(Dhcp4o6IpcBaseTest, send6To4WithVendorOption) {
testSendReceive(TEST_ITERATIONS, ENDPOINT_TYPE_V6, ENDPOINT_TYPE_V4,
&createDHCPv4o6MsgWithVendorOption);
}
// This test checks that the values of the socket descriptor are correct
......@@ -397,7 +474,7 @@ TEST_F(Dhcp4o6IpcBaseTest, receiveInvalidEnterpriseId) {
testReceiveError(pkt);
}
// This test verifies that receiving pakcet over the IPC fails when the
// This test verifies that receiving packet over the IPC fails when the
// interface option is not present.
TEST_F(Dhcp4o6IpcBaseTest, receiveWithoutInterfaceOption) {
Pkt6Ptr pkt(new Pkt6(DHCPV6_DHCPV4_QUERY, 0));
......@@ -446,5 +523,43 @@ TEST_F(Dhcp4o6IpcBaseTest, receiveWithoutSourceAddressOption) {
testReceiveError(pkt);
}
// This test verifies that send method throws exception when the packet
// is NULL.
TEST_F(Dhcp4o6IpcBaseTest, sendNullMessage) {
TestIpc ipc(TEST_PORT, ENDPOINT_TYPE_V4);
ASSERT_NO_THROW(ipc.open());
// NULL message.
EXPECT_THROW(ipc.send(Pkt6Ptr()), Dhcp4o6IpcError);
}
// This test verifies that send method throws exception when the IPC
// socket is not opened.
TEST_F(Dhcp4o6IpcBaseTest, sendOverClosedSocket) {
TestIpc ipc(TEST_PORT, ENDPOINT_TYPE_V4);
// Create a message.
Pkt6Ptr pkt(createDHCPv4o6Message(DHCPV6_DHCPV4_QUERY));
// Sending over the closed socket should fail.
EXPECT_THROW(ipc.send(pkt), Dhcp4o6IpcError);
}
// This test verifies that send method throws exception when the IPC
// socket has been unexpectedly closed.
TEST_F(Dhcp4o6IpcBaseTest, sendOverUnexpectedlyClosedSocket) {
TestIpc ipc(TEST_PORT, ENDPOINT_TYPE_V4);
ASSERT_NO_THROW(ipc.open());
// Close the socket behind the scenes. The IPC doesn't know that the
// socket has been closed and it still holds the descriptor.
::close(ipc.getSocketFd());
// Create a message.
Pkt6Ptr pkt(createDHCPv4o6Message(DHCPV6_DHCPV4_QUERY));
// Sending over the closed socket should fail.
EXPECT_THROW(ipc.send(pkt), Dhcp4o6IpcError);
}
} // end of anonymous namespace
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