void UDPTest::test_equals(const UDP& udp1, const UDP& udp2) {
EXPECT_EQ(udp1.dport(), udp2.dport());
EXPECT_EQ(udp1.sport(), udp2.sport());
EXPECT_EQ(udp1.length(), udp2.length());
EXPECT_EQ(udp1.size(), udp2.size());
EXPECT_EQ(udp1.header_size(), udp2.header_size());
EXPECT_EQ(bool(udp1.inner_pdu()), bool(udp2.inner_pdu()));
}
bool callback(const PDU &pdu)
{
// The packet probably looks like this:
//
// EthernetII / IP / UDP / RawPDU
//
// So we retrieve each layer, and construct a
// DNS PDU from the RawPDU layer contents.
EthernetII eth = pdu.rfind_pdu<EthernetII>();
IP ip = eth.rfind_pdu<IP>();
UDP udp = ip.rfind_pdu<UDP>();
DNS dns = udp.rfind_pdu<RawPDU>().to<DNS>();
// Is it a DNS query?
if(dns.type() == DNS::QUERY) {
// Let's see if there's any query for an "A" record.
for(const auto &query : dns.queries()) {
if(query.type() == DNS::A) {
// Here's one! Let's add an answer.
dns.add_answer(
DNS::Resource(
query.dname(),
"127.0.0.1",
DNS::A,
query.query_class(),
// 777 is just a random TTL
777
)
);
}
}
// Have we added some answers?
if(dns.answers_count() > 0) {
// It's a response now
dns.type(DNS::RESPONSE);
// Recursion is available(just in case)
dns.recursion_available(1);
// Build our packet
auto pkt = EthernetII(eth.src_addr(), eth.dst_addr()) /
IP(ip.src_addr(), ip.dst_addr()) /
UDP(udp.sport(), udp.dport()) /
dns;
// Send it!
sender.send(pkt);
}
}
return true;
}
TEST_F(UDPTest, DPort) {
UDP udp;
uint16_t port = 0x1234;
udp.dport(port);
ASSERT_EQ(udp.dport(), port);
}
TEST_F(UDPTest, DefaultContructor) {
UDP udp;
EXPECT_EQ(udp.dport(), 0);
EXPECT_EQ(udp.sport(), 0);
EXPECT_FALSE(udp.inner_pdu());
}