[4027] added unit tests for Pkt4o6Test

(with other some small cleanups)

src/lib/dhcp/pkt4o6.h

@@ -63,7 +63,7 @@ public:
         return (true);
     }
 
-protected:
+private:
     /// Encapsulating DHCPv6 message
     Pkt6Ptr pkt6_;
 

src/lib/dhcp/pkt6.h

@@ -244,7 +244,7 @@ public:
     /// @param option_code code of the requested option
     /// @param nesting_level see description above
     ///
-    /// @return pointer to the option (or NULL if there is no such option)
+     /// @return pointer to the option (or NULL if there is no such option)
     OptionPtr getRelayOption(uint16_t option_code, uint8_t nesting_level);
 
     /// @brief Return first instance of a specified option

src/lib/dhcp/tests/Makefile.am

@@ -74,6 +74,7 @@ libdhcp___unittests_SOURCES += option_vendor_class_unittest.cc
 libdhcp___unittests_SOURCES  += pkt_captures4.cc pkt_captures6.cc pkt_captures.h
 libdhcp___unittests_SOURCES += pkt4_unittest.cc
 libdhcp___unittests_SOURCES += pkt6_unittest.cc
+libdhcp___unittests_SOURCES += pkt4o6_unittest.cc
 libdhcp___unittests_SOURCES += pkt_filter_unittest.cc
 libdhcp___unittests_SOURCES += pkt_filter_inet_unittest.cc
 libdhcp___unittests_SOURCES += pkt_filter_inet6_unittest.cc

src/lib/dhcp/tests/pkt4o6_unittest.cc

@@ -0,0 +1,98 @@
+// 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 <dhcp/dhcp6.h>
+#include <dhcp/option.h>
+#include <dhcp/pkt4.h>
+#include <dhcp/pkt6.h>
+#include <dhcp/pkt4o6.h>
+
+#include <boost/scoped_ptr.hpp>
+
+#include <gtest/gtest.h>
+
+using namespace isc::dhcp;
+
+namespace {
+class Pkt4o6Test : public ::testing::Test {
+protected:
+    Pkt4o6Test() :
+        data6_(6, 0),
+        pkt6_(new Pkt6(&data6_[0], data6_.size())),
+        pkt4_(new Pkt4(DHCPDISCOVER, 0x12345678))
+    {
+        pkt4_->pack();
+        const uint8_t* cp = static_cast<const uint8_t*>(
+            pkt4_->getBuffer().getData());
+        buffer4_.assign(cp, cp + pkt4_->getBuffer().getLength());
+    }
+
+protected:
+    const std::vector<uint8_t> data6_;
+    // commonly used test data
+    Pkt6Ptr pkt6_;
+    Pkt4Ptr pkt4_;
+    OptionBuffer buffer4_;
+};
+
+TEST_F(Pkt4o6Test, construct) {
+    // Construct 4o6 packet, unpack the data to examine it
+    boost::scoped_ptr<Pkt4o6> pkt4o6(new Pkt4o6(buffer4_, pkt6_));
+    pkt4o6->unpack();
+    // Inspect its internal to confirm it's built as expected.  We also test
+    // isDhcp4o6() here.
+    EXPECT_TRUE(pkt4o6->isDhcp4o6());
+    EXPECT_EQ(pkt6_, pkt4o6->getPkt6());
+    EXPECT_EQ(DHCPDISCOVER, pkt4o6->getType());
+
+    // Same check for the other constructor.  It relies on the internal
+    // behavior of Pkt4's copy constructor, so we need to first unpack pkt4.
+    pkt4_.reset(new Pkt4(&buffer4_[0], buffer4_.size()));
+    pkt4_->unpack();
+    pkt4o6.reset(new Pkt4o6(pkt4_, pkt6_));
+    EXPECT_TRUE(pkt4o6->isDhcp4o6());
+    EXPECT_EQ(pkt6_, pkt4o6->getPkt6());
+    EXPECT_EQ(DHCPDISCOVER, pkt4o6->getType());
+}
+
+TEST_F(Pkt4o6Test, pack) {
+    // prepare unpacked DHCPv4 packet (see the note in constructor test)
+    pkt4_.reset(new Pkt4(&buffer4_[0], buffer4_.size()));
+    pkt4_->unpack();
+
+    // Construct 4o6 packet to be tested and pack the data.
+    Pkt4o6 pkt4o6(pkt4_, pkt6_);
+    pkt4o6.pack();
+
+    // The packed data should be:
+    // 4-byte DHCPv6 message header
+    // 4-byte header part of DHCPv4 message option
+    // Raw DHCPv4 message (data stored in buffer4_)
+    EXPECT_EQ(4 + 4 + buffer4_.size(),
+              pkt4o6.getPkt6()->getBuffer().getLength());
+
+    // Check the DHCPv4 message option content (Pkt4o6 class is not responsible
+    // for making it valid, so we won't examine it)
+    const u_int8_t* cp = static_cast<const u_int8_t*>(
+        pkt4o6.getPkt6()->getBuffer().getData());
+    EXPECT_EQ(0, cp[4]);
+    EXPECT_EQ(D6O_DHCPV4_MSG, cp[5]);
+    EXPECT_EQ((buffer4_.size() >> 8) & 0xff, cp[6]);
+    EXPECT_EQ(buffer4_.size() & 0xff, cp[7]);
+    EXPECT_EQ(0, memcmp(&cp[8], &buffer4_[0], buffer4_.size()));
+}
+
+}