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// Copyright (C) 2010 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 <sstream>
#include <exceptions/exceptions.h>
#include <util/buffer.h>
#include <dns/edns.h>
#include <dns/exceptions.h>
#include <dns/message.h>
#include <dns/messagerenderer.h>
#include <dns/name.h>
#include <dns/rcode.h>
#include <dns/rdataclass.h>
#include <dns/rrclass.h>
#include <dns/rrttl.h>
#include <dns/rrtype.h>
#include <gtest/gtest.h>
#include <dns/tests/unittest_util.h>
#include <util/unittests/wiredata.h>
using namespace std;
using namespace isc::dns;
using namespace isc::util;
using namespace isc::dns::rdata;
using isc::UnitTestUtil;
using isc::util::unittests::matchWireData;
const uint8_t EDNS::SUPPORTED_VERSION;
namespace {
class EDNSTest : public ::testing::Test {
protected:
EDNSTest() : rrtype(RRType::OPT()), buffer(NULL, 0), obuffer(0), rcode(0) {
opt_rdata = ConstRdataPtr(new generic::OPT());
edns_base.setUDPSize(4096);
}
RRType rrtype;
EDNS edns_base;
ConstEDNSPtr edns;
InputBuffer buffer;
OutputBuffer obuffer;
MessageRenderer renderer;
ConstRdataPtr opt_rdata;
Rcode rcode;
vector<unsigned char> wiredata;
};
// RRClass of EDNS OPT means UDP buffer size
const RRClass rrclass(4096);
// RRTTL of EDNS OPT encodes extended-rcode, version, and DO bit
const RRTTL rrttl_do_on(0x00008000); // DO=on
const RRTTL rrttl_do_off(0); // DO=off
const RRTTL rrttl_badver(0x00018000); // version=1, DO=on
TEST_F(EDNSTest, badVerConstruct) {
EXPECT_THROW(EDNS(1), isc::InvalidParameter);
}
TEST_F(EDNSTest, DNSSECDOBit) {
// tests for EDNS from RR
// DO bit is on, so DNSSEC should be considered to be supported.
EXPECT_TRUE(EDNS(Name::ROOT_NAME(), rrclass, rrtype,
rrttl_do_on, *opt_rdata).getDNSSECAwareness());
// DO bit is off. DNSSEC should be considered to be unsupported.
EXPECT_FALSE(EDNS(Name::ROOT_NAME(), rrclass, rrtype,
rrttl_do_off, *opt_rdata).getDNSSECAwareness());
// tests for EDNS constructed by hand
EXPECT_FALSE(edns_base.getDNSSECAwareness()); // false by default
edns_base.setDNSSECAwareness(true); // enable by hand
EXPECT_TRUE(edns_base.getDNSSECAwareness());
edns_base.setDNSSECAwareness(false); // disable by hand
EXPECT_FALSE(edns_base.getDNSSECAwareness());
}
TEST_F(EDNSTest, UDPSize) {
EXPECT_EQ(4096, EDNS(Name::ROOT_NAME(), rrclass, rrtype, rrttl_do_on,
*opt_rdata).getUDPSize());
// EDNS UDP size smaller than the traditional max, 512. Unusual, but
// not prohibited.
edns_base.setUDPSize(511);
EXPECT_EQ(511, edns_base.getUDPSize());
// Even 0 is okay.
edns_base.setUDPSize(0);
EXPECT_EQ(0, edns_base.getUDPSize());
// Possible max value is also okay, although the higher layer app may
// adjust it to a reasonably lower value
edns_base.setUDPSize(65535);
EXPECT_EQ(65535, edns_base.getUDPSize());
}
TEST_F(EDNSTest, getVersion) {
// Constructed by hand
EXPECT_EQ(EDNS::SUPPORTED_VERSION, EDNS().getVersion());
// From RR
EXPECT_EQ(EDNS::SUPPORTED_VERSION,
EDNS(Name::ROOT_NAME(), rrclass, rrtype, rrttl_do_on,
*opt_rdata).getVersion());
}
TEST_F(EDNSTest, BadWireData) {
// Incompatible RR type
EXPECT_THROW(EDNS(Name::ROOT_NAME(), rrclass, RRType::A(),
rrttl_do_on, *opt_rdata), isc::InvalidParameter);
// OPT RR of a non root name
EXPECT_THROW(EDNS(Name("example.com"), rrclass, rrtype,
rrttl_do_on, *opt_rdata), DNSMessageFORMERR);
// Unsupported Version
EXPECT_THROW(EDNS(Name::ROOT_NAME(), rrclass, rrtype,
rrttl_badver, *opt_rdata), DNSMessageBADVERS);
}
TEST_F(EDNSTest, toText) {
// Typical case, disabling DNSSEC
EXPECT_EQ("; EDNS: version: 0, flags:; udp: 4096\n",
EDNS(Name::ROOT_NAME(), rrclass, rrtype, rrttl_do_off,
*opt_rdata).toText());
// Typical case, enabling DNSSEC
EXPECT_EQ("; EDNS: version: 0, flags: do; udp: 4096\n",
EDNS(Name::ROOT_NAME(), rrclass, rrtype, rrttl_do_on,
*opt_rdata).toText());
// Non-0 extended Rcode: ignored in the toText() output.
EXPECT_EQ("; EDNS: version: 0, flags: do; udp: 4096\n",
EDNS(Name::ROOT_NAME(), rrclass, rrtype,
RRTTL(0x01008000), *opt_rdata).toText());
// Unknown flag: ignored in the toText() output.
EXPECT_EQ("; EDNS: version: 0, flags: do; udp: 4096\n",
EDNS(Name::ROOT_NAME(), rrclass, rrtype,
RRTTL(0x00008001), *opt_rdata).toText());
}
TEST_F(EDNSTest, toWireRenderer) {
// Typical case, (explicitly) disabling DNSSEC
edns_base.setDNSSECAwareness(false);
EXPECT_EQ(1, edns_base.toWire(renderer,
Rcode::NOERROR().getExtendedCode()));
UnitTestUtil::readWireData("edns_toWire1.wire", wiredata);
matchWireData(&wiredata[0], wiredata.size(),
renderer.getData(), renderer.getLength());
// Typical case, enabling DNSSEC
renderer.clear();
wiredata.clear();
edns_base.setDNSSECAwareness(true);
EXPECT_EQ(1, edns_base.toWire(renderer,
Rcode::NOERROR().getExtendedCode()));
UnitTestUtil::readWireData("edns_toWire2.wire", wiredata);
matchWireData(&wiredata[0], wiredata.size(),
renderer.getData(), renderer.getLength());
// Non-0 extended Rcode
renderer.clear();
wiredata.clear();
edns_base.setDNSSECAwareness(true);
EXPECT_EQ(1, edns_base.toWire(renderer,
Rcode::BADVERS().getExtendedCode()));
UnitTestUtil::readWireData("edns_toWire3.wire", wiredata);
matchWireData(&wiredata[0], wiredata.size(),
renderer.getData(), renderer.getLength());
// Uncommon UDP buffer size
renderer.clear();
wiredata.clear();
edns_base.setDNSSECAwareness(true);
edns_base.setUDPSize(511);
EXPECT_EQ(1, edns_base.toWire(renderer,
Rcode::NOERROR().getExtendedCode()));
UnitTestUtil::readWireData("edns_toWire4.wire", wiredata);
matchWireData(&wiredata[0], wiredata.size(),
renderer.getData(), renderer.getLength());
// From RR with unknown flag. If used for toWire(), the unknown flag
// should disappear.
renderer.clear();
wiredata.clear();
EXPECT_EQ(1, EDNS(Name::ROOT_NAME(), rrclass, rrtype, RRTTL(0x00008001),
*opt_rdata).toWire(renderer,
Rcode::NOERROR().getExtendedCode()));
UnitTestUtil::readWireData("edns_toWire2.wire", wiredata);
matchWireData(&wiredata[0], wiredata.size(),
renderer.getData(), renderer.getLength());
// If the available length in the renderer is not sufficient for the OPT
// RR, it shouldn't be inserted.
renderer.clear();
renderer.setLengthLimit(10); // 10 = minimum length of OPT RR - 1
edns_base.setDNSSECAwareness(true);
edns_base.setUDPSize(4096);
EXPECT_EQ(0, edns_base.toWire(renderer,
Rcode::NOERROR().getExtendedCode()));
// renderer should be intact
EXPECT_EQ(0, renderer.getLength());
}
TEST_F(EDNSTest, toWireBuffer) {
// "to renderer" and "to buffer" should generally produce the same result.
// for simplicity we only check one typical case to confirm that.
EXPECT_EQ(1, edns_base.toWire(obuffer,
Rcode::NOERROR().getExtendedCode()));
UnitTestUtil::readWireData("edns_toWire1.wire", wiredata);
matchWireData(&wiredata[0], wiredata.size(),
obuffer.getData(), obuffer.getLength());
}
TEST_F(EDNSTest, createFromRR) {
uint8_t extended_rcode;
// normal case
edns = ConstEDNSPtr(createEDNSFromRR(Name::ROOT_NAME(), rrclass, rrtype,
rrttl_do_on, *opt_rdata,
extended_rcode));
EXPECT_EQ(EDNS::SUPPORTED_VERSION, edns->getVersion());
EXPECT_TRUE(edns->getDNSSECAwareness());
EXPECT_EQ(4096, edns->getUDPSize());
EXPECT_EQ(0, static_cast<int>(extended_rcode));
// non-0 extended rcode
extended_rcode = 0;
ConstEDNSPtr(createEDNSFromRR(Name::ROOT_NAME(), rrclass, rrtype,
RRTTL(0x01008000), *opt_rdata,
extended_rcode));
EXPECT_EQ(1, static_cast<int>(extended_rcode));
// creation triggers an exception. extended_rcode must be intact.
extended_rcode = 0;
EXPECT_THROW(createEDNSFromRR(Name::ROOT_NAME(), rrclass, rrtype,
rrttl_badver, *opt_rdata, extended_rcode),
DNSMessageBADVERS);
EXPECT_EQ(0, static_cast<int>(extended_rcode));
}
// test operator<<. We simply confirm it appends the result of toText().
TEST_F(EDNSTest, LeftShiftOperator) {
ostringstream oss;
oss << edns_base;
EXPECT_EQ(edns_base.toText(), oss.str());
}
}
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