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dns_udp_test.go
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dns_udp_test.go
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// +build !integration
// Unit tests and benchmarks for the dns package.
//
// The byte array test data was generated from pcap files using the gopacket
// test_creator.py script contained in the gopacket repository. The script was
// modified to drop the Ethernet, IP, and UDP headers from the byte arrays
// (skip the first 42 bytes).
//
// TODO:
// * Add test validation for responsetime to make sure unit conversion
// is being done correctly.
// * Add test case to verify that Include_authorities and Include_additionals
// are working.
// * Add test case for Send_request and validate the stringified DNS message.
// * Add test case for Send_response and validate the stringified DNS message.
package dns
import (
"fmt"
"math/rand"
"testing"
"time"
"github.com/elastic/beats/packetbeat/protos"
"github.com/elastic/beats/packetbeat/publish"
"github.com/elastic/beats/libbeat/common"
mkdns "github.com/miekg/dns"
"github.com/stretchr/testify/assert"
)
// Verify that the interface for UDP has been satisfied.
var _ protos.UdpPlugin = &Dns{}
// DNS messages for testing. When adding a new test message, add it to the
// messages array and create a new benchmark test for the message.
var (
// An array of all test messages.
messages = []DnsTestMessage{
elasticA,
zoneIxfr,
githubPtr,
sophosTxt,
ednsSecA,
}
elasticA = DnsTestMessage{
id: 8529,
opcode: "QUERY",
flags: []string{"rd", "ra"},
rcode: "NOERROR",
q_class: "IN",
q_type: "A",
q_name: "elastic.co.",
q_etld: "elastic.co.",
answers: []string{"54.148.130.30", "54.69.104.66"},
request: []byte{
0x21, 0x51, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0x65, 0x6c, 0x61,
0x73, 0x74, 0x69, 0x63, 0x02, 0x63, 0x6f, 0x00, 0x00, 0x01, 0x00, 0x01,
},
response: []byte{
0x21, 0x51, 0x81, 0x80, 0x00, 0x01, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x07, 0x65, 0x6c, 0x61,
0x73, 0x74, 0x69, 0x63, 0x02, 0x63, 0x6f, 0x00, 0x00, 0x01, 0x00, 0x01, 0xc0, 0x0c, 0x00, 0x01,
0x00, 0x01, 0x00, 0x00, 0x00, 0x39, 0x00, 0x04, 0x36, 0x94, 0x82, 0x1e, 0xc0, 0x0c, 0x00, 0x01,
0x00, 0x01, 0x00, 0x00, 0x00, 0x39, 0x00, 0x04, 0x36, 0x45, 0x68, 0x42,
},
}
zoneIxfr = DnsTestMessage{
id: 16384,
opcode: "QUERY",
flags: []string{"ra"},
rcode: "NOERROR",
q_class: "IN",
q_type: "IXFR",
q_name: "etas.com.",
q_etld: "etas.com.",
answers: []string{"training2003p.", "training2003p.", "training2003p.",
"training2003p.", "1.1.1.100"},
request: []byte{
0x40, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x04, 0x65, 0x74, 0x61,
0x73, 0x03, 0x63, 0x6f, 0x6d, 0x00, 0x00, 0xfb, 0x00, 0x01, 0xc0, 0x0c, 0x00, 0x06, 0x00, 0x01,
0x00, 0x00, 0x0e, 0x10, 0x00, 0x2f, 0x0d, 0x74, 0x72, 0x61, 0x69, 0x6e, 0x69, 0x6e, 0x67, 0x32,
0x30, 0x30, 0x33, 0x70, 0x00, 0x0a, 0x68, 0x6f, 0x73, 0x74, 0x6d, 0x61, 0x73, 0x74, 0x65, 0x72,
0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x02, 0x58, 0x00, 0x01, 0x51,
0x80, 0x00, 0x00, 0x0e, 0x10, 0x4d, 0x53,
},
response: []byte{
0x40, 0x00, 0x80, 0x80, 0x00, 0x01, 0x00, 0x05, 0x00, 0x00, 0x00, 0x00, 0x04, 0x65, 0x74, 0x61,
0x73, 0x03, 0x63, 0x6f, 0x6d, 0x00, 0x00, 0xfb, 0x00, 0x01, 0xc0, 0x0c, 0x00, 0x06, 0x00, 0x01,
0x00, 0x00, 0x0e, 0x10, 0x00, 0x2f, 0x0d, 0x74, 0x72, 0x61, 0x69, 0x6e, 0x69, 0x6e, 0x67, 0x32,
0x30, 0x30, 0x33, 0x70, 0x00, 0x0a, 0x68, 0x6f, 0x73, 0x74, 0x6d, 0x61, 0x73, 0x74, 0x65, 0x72,
0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x02, 0x58, 0x00, 0x01, 0x51,
0x80, 0x00, 0x00, 0x0e, 0x10, 0xc0, 0x0c, 0x00, 0x06, 0x00, 0x01, 0x00, 0x00, 0x0e, 0x10, 0x00,
0x18, 0xc0, 0x26, 0xc0, 0x35, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x02,
0x58, 0x00, 0x01, 0x51, 0x80, 0x00, 0x00, 0x0e, 0x10, 0xc0, 0x0c, 0x00, 0x06, 0x00, 0x01, 0x00,
0x00, 0x0e, 0x10, 0x00, 0x18, 0xc0, 0x26, 0xc0, 0x35, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00,
0x3c, 0x00, 0x00, 0x02, 0x58, 0x00, 0x01, 0x51, 0x80, 0x00, 0x00, 0x0e, 0x10, 0x05, 0x69, 0x6e,
0x64, 0x65, 0x78, 0xc0, 0x0c, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x0e, 0x10, 0x00, 0x04, 0x01,
0x01, 0x01, 0x64, 0xc0, 0x0c, 0x00, 0x06, 0x00, 0x01, 0x00, 0x00, 0x0e, 0x10, 0x00, 0x18, 0xc0,
0x26, 0xc0, 0x35, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x02, 0x58, 0x00,
0x01, 0x51, 0x80, 0x00, 0x00, 0x0e, 0x10,
},
}
githubPtr = DnsTestMessage{
id: 344,
opcode: "QUERY",
flags: []string{"rd", "ra"},
rcode: "NOERROR",
q_class: "IN",
q_type: "PTR",
q_name: "131.252.30.192.in-addr.arpa.",
q_etld: "192.in-addr.arpa.",
answers: []string{"github.com."},
authorities: []string{"a.root-servers.net.", "b.root-servers.net.", "c.root-servers.net.",
"d.root-servers.net.", "e.root-servers.net.", "f.root-servers.net.", "g.root-servers.net.",
"h.root-servers.net.", "i.root-servers.net.", "j.root-servers.net.", "k.root-servers.net.",
"l.root-servers.net.", "m.root-servers.net."},
request: []byte{
0x01, 0x58, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x31, 0x33, 0x31,
0x03, 0x32, 0x35, 0x32, 0x02, 0x33, 0x30, 0x03, 0x31, 0x39, 0x32, 0x07, 0x69, 0x6e, 0x2d, 0x61,
0x64, 0x64, 0x72, 0x04, 0x61, 0x72, 0x70, 0x61, 0x00, 0x00, 0x0c, 0x00, 0x01,
},
response: []byte{
0x01, 0x58, 0x81, 0x80, 0x00, 0x01, 0x00, 0x01, 0x00, 0x0d, 0x00, 0x00, 0x03, 0x31, 0x33, 0x31,
0x03, 0x32, 0x35, 0x32, 0x02, 0x33, 0x30, 0x03, 0x31, 0x39, 0x32, 0x07, 0x69, 0x6e, 0x2d, 0x61,
0x64, 0x64, 0x72, 0x04, 0x61, 0x72, 0x70, 0x61, 0x00, 0x00, 0x0c, 0x00, 0x01, 0xc0, 0x0c, 0x00,
0x0c, 0x00, 0x01, 0x00, 0x00, 0x09, 0xe2, 0x00, 0x0c, 0x06, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62,
0x03, 0x63, 0x6f, 0x6d, 0x00, 0x00, 0x00, 0x02, 0x00, 0x01, 0x00, 0x00, 0x07, 0xb8, 0x00, 0x14,
0x01, 0x6c, 0x0c, 0x72, 0x6f, 0x6f, 0x74, 0x2d, 0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x73, 0x03,
0x6e, 0x65, 0x74, 0x00, 0x00, 0x00, 0x02, 0x00, 0x01, 0x00, 0x00, 0x07, 0xb8, 0x00, 0x04, 0x01,
0x65, 0xc0, 0x52, 0x00, 0x00, 0x02, 0x00, 0x01, 0x00, 0x00, 0x07, 0xb8, 0x00, 0x04, 0x01, 0x63,
0xc0, 0x52, 0x00, 0x00, 0x02, 0x00, 0x01, 0x00, 0x00, 0x07, 0xb8, 0x00, 0x04, 0x01, 0x62, 0xc0,
0x52, 0x00, 0x00, 0x02, 0x00, 0x01, 0x00, 0x00, 0x07, 0xb8, 0x00, 0x04, 0x01, 0x61, 0xc0, 0x52,
0x00, 0x00, 0x02, 0x00, 0x01, 0x00, 0x00, 0x07, 0xb8, 0x00, 0x04, 0x01, 0x68, 0xc0, 0x52, 0x00,
0x00, 0x02, 0x00, 0x01, 0x00, 0x00, 0x07, 0xb8, 0x00, 0x04, 0x01, 0x66, 0xc0, 0x52, 0x00, 0x00,
0x02, 0x00, 0x01, 0x00, 0x00, 0x07, 0xb8, 0x00, 0x04, 0x01, 0x69, 0xc0, 0x52, 0x00, 0x00, 0x02,
0x00, 0x01, 0x00, 0x00, 0x07, 0xb8, 0x00, 0x04, 0x01, 0x67, 0xc0, 0x52, 0x00, 0x00, 0x02, 0x00,
0x01, 0x00, 0x00, 0x07, 0xb8, 0x00, 0x04, 0x01, 0x6d, 0xc0, 0x52, 0x00, 0x00, 0x02, 0x00, 0x01,
0x00, 0x00, 0x07, 0xb8, 0x00, 0x04, 0x01, 0x64, 0xc0, 0x52, 0x00, 0x00, 0x02, 0x00, 0x01, 0x00,
0x00, 0x07, 0xb8, 0x00, 0x04, 0x01, 0x6a, 0xc0, 0x52, 0x00, 0x00, 0x02, 0x00, 0x01, 0x00, 0x00,
0x07, 0xb8, 0x00, 0x04, 0x01, 0x6b, 0xc0, 0x52,
},
}
sophosTxt = DnsTestMessage{
id: 8238,
opcode: "QUERY",
flags: []string{"rd", "ra"},
rcode: "NXDOMAIN",
q_class: "IN",
q_type: "TXT",
q_name: "3.1o19ss00s2s17s4qp375sp49r830n2n4n923s8839052s7p7768s53365226pp3.659p1r741os37393" +
"648s2348o762q1066q53rq5p4614r1q4781qpr16n809qp4.879o3o734q9sns005o3pp76q83.2q65qns3spns" +
"1081s5rn5sr74opqrqnpq6rn3ro5.i.00.mac.sophosxl.net.",
q_etld: "sophosxl.net.",
request: []byte{
0x20, 0x2e, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x33, 0x3f, 0x31,
0x6f, 0x31, 0x39, 0x73, 0x73, 0x30, 0x30, 0x73, 0x32, 0x73, 0x31, 0x37, 0x73, 0x34, 0x71, 0x70,
0x33, 0x37, 0x35, 0x73, 0x70, 0x34, 0x39, 0x72, 0x38, 0x33, 0x30, 0x6e, 0x32, 0x6e, 0x34, 0x6e,
0x39, 0x32, 0x33, 0x73, 0x38, 0x38, 0x33, 0x39, 0x30, 0x35, 0x32, 0x73, 0x37, 0x70, 0x37, 0x37,
0x36, 0x38, 0x73, 0x35, 0x33, 0x33, 0x36, 0x35, 0x32, 0x32, 0x36, 0x70, 0x70, 0x33, 0x3f, 0x36,
0x35, 0x39, 0x70, 0x31, 0x72, 0x37, 0x34, 0x31, 0x6f, 0x73, 0x33, 0x37, 0x33, 0x39, 0x33, 0x36,
0x34, 0x38, 0x73, 0x32, 0x33, 0x34, 0x38, 0x6f, 0x37, 0x36, 0x32, 0x71, 0x31, 0x30, 0x36, 0x36,
0x71, 0x35, 0x33, 0x72, 0x71, 0x35, 0x70, 0x34, 0x36, 0x31, 0x34, 0x72, 0x31, 0x71, 0x34, 0x37,
0x38, 0x31, 0x71, 0x70, 0x72, 0x31, 0x36, 0x6e, 0x38, 0x30, 0x39, 0x71, 0x70, 0x34, 0x1a, 0x38,
0x37, 0x39, 0x6f, 0x33, 0x6f, 0x37, 0x33, 0x34, 0x71, 0x39, 0x73, 0x6e, 0x73, 0x30, 0x30, 0x35,
0x6f, 0x33, 0x70, 0x70, 0x37, 0x36, 0x71, 0x38, 0x33, 0x28, 0x32, 0x71, 0x36, 0x35, 0x71, 0x6e,
0x73, 0x33, 0x73, 0x70, 0x6e, 0x73, 0x31, 0x30, 0x38, 0x31, 0x73, 0x35, 0x72, 0x6e, 0x35, 0x73,
0x72, 0x37, 0x34, 0x6f, 0x70, 0x71, 0x72, 0x71, 0x6e, 0x70, 0x71, 0x36, 0x72, 0x6e, 0x33, 0x72,
0x6f, 0x35, 0x01, 0x69, 0x02, 0x30, 0x30, 0x03, 0x6d, 0x61, 0x63, 0x08, 0x73, 0x6f, 0x70, 0x68,
0x6f, 0x73, 0x78, 0x6c, 0x03, 0x6e, 0x65, 0x74, 0x00, 0x00, 0x10, 0x00, 0x01,
},
response: []byte{
0x20, 0x2e, 0x81, 0x83, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x33, 0x3f, 0x31,
0x6f, 0x31, 0x39, 0x73, 0x73, 0x30, 0x30, 0x73, 0x32, 0x73, 0x31, 0x37, 0x73, 0x34, 0x71, 0x70,
0x33, 0x37, 0x35, 0x73, 0x70, 0x34, 0x39, 0x72, 0x38, 0x33, 0x30, 0x6e, 0x32, 0x6e, 0x34, 0x6e,
0x39, 0x32, 0x33, 0x73, 0x38, 0x38, 0x33, 0x39, 0x30, 0x35, 0x32, 0x73, 0x37, 0x70, 0x37, 0x37,
0x36, 0x38, 0x73, 0x35, 0x33, 0x33, 0x36, 0x35, 0x32, 0x32, 0x36, 0x70, 0x70, 0x33, 0x3f, 0x36,
0x35, 0x39, 0x70, 0x31, 0x72, 0x37, 0x34, 0x31, 0x6f, 0x73, 0x33, 0x37, 0x33, 0x39, 0x33, 0x36,
0x34, 0x38, 0x73, 0x32, 0x33, 0x34, 0x38, 0x6f, 0x37, 0x36, 0x32, 0x71, 0x31, 0x30, 0x36, 0x36,
0x71, 0x35, 0x33, 0x72, 0x71, 0x35, 0x70, 0x34, 0x36, 0x31, 0x34, 0x72, 0x31, 0x71, 0x34, 0x37,
0x38, 0x31, 0x71, 0x70, 0x72, 0x31, 0x36, 0x6e, 0x38, 0x30, 0x39, 0x71, 0x70, 0x34, 0x1a, 0x38,
0x37, 0x39, 0x6f, 0x33, 0x6f, 0x37, 0x33, 0x34, 0x71, 0x39, 0x73, 0x6e, 0x73, 0x30, 0x30, 0x35,
0x6f, 0x33, 0x70, 0x70, 0x37, 0x36, 0x71, 0x38, 0x33, 0x28, 0x32, 0x71, 0x36, 0x35, 0x71, 0x6e,
0x73, 0x33, 0x73, 0x70, 0x6e, 0x73, 0x31, 0x30, 0x38, 0x31, 0x73, 0x35, 0x72, 0x6e, 0x35, 0x73,
0x72, 0x37, 0x34, 0x6f, 0x70, 0x71, 0x72, 0x71, 0x6e, 0x70, 0x71, 0x36, 0x72, 0x6e, 0x33, 0x72,
0x6f, 0x35, 0x01, 0x69, 0x02, 0x30, 0x30, 0x03, 0x6d, 0x61, 0x63, 0x08, 0x73, 0x6f, 0x70, 0x68,
0x6f, 0x73, 0x78, 0x6c, 0x03, 0x6e, 0x65, 0x74, 0x00, 0x00, 0x10, 0x00, 0x01,
},
}
ednsSecA = DnsTestMessage{
id: 20498,
opcode: "QUERY",
flags: []string{"rd", "ad", "ra"},
rcode: "NOERROR",
q_class: "IN",
q_type: "A",
q_name: "www.ietf.org.",
q_etld: "ietf.org.",
answers: []string{"64.170.98.30", "iDA8bJnrAEz3jgYnyFRm567a76qlv1V0CqxOSd/o9nvnN0GlZLaVoDmuXpaIaoypbGxwzwgK/LY6CV2k6SWKwicBmpENL26hwyjkFzPDW8kX3ibFhtfsOb8pYe7nBj326actp/7iG+DRuDmPnkYBja+wDYk61doTtkqZg57fn3iS97tjNPCC9C9knRAuDYUG+dVxalazSwYrpvY97dUC1H2spD0g4UdDyCbGA46mouZ4GPzNMewgf948qxrnU8pWPk3nQW5TgLVkGoWgco2owfLElBqf6rJ4LOswuhaw8IpTtmw3FsixxTLQvKOE5nftd1nMhQQd9CaHjoKNAUEz5Q=="},
request: []byte{
0x50, 0x12, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x03, 0x77, 0x77, 0x77,
0x04, 0x69, 0x65, 0x74, 0x66, 0x03, 0x6f, 0x72, 0x67, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00,
0x29, 0x10, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00,
},
response: []byte{
0x50, 0x12, 0x81, 0xa0, 0x00, 0x01, 0x00, 0x02, 0x00, 0x00, 0x00, 0x01, 0x03, 0x77, 0x77, 0x77,
0x04, 0x69, 0x65, 0x74, 0x66, 0x03, 0x6f, 0x72, 0x67, 0x00, 0x00, 0x01, 0x00, 0x01, 0xc0, 0x0c,
0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x04, 0xd8, 0x00, 0x04, 0x40, 0xaa, 0x62, 0x1e, 0xc0, 0x0c,
0x00, 0x2e, 0x00, 0x01, 0x00, 0x00, 0x04, 0xd8, 0x01, 0x1c, 0x00, 0x01, 0x05, 0x03, 0x00, 0x00,
0x07, 0x08, 0x52, 0xd0, 0x71, 0xc7, 0x50, 0xef, 0x30, 0xaf, 0x9e, 0x04, 0x04, 0x69, 0x65, 0x74,
0x66, 0x03, 0x6f, 0x72, 0x67, 0x00, 0x88, 0x30, 0x3c, 0x6c, 0x99, 0xeb, 0x00, 0x4c, 0xf7, 0x8e,
0x06, 0x27, 0xc8, 0x54, 0x66, 0xe7, 0xae, 0xda, 0xef, 0xaa, 0xa5, 0xbf, 0x55, 0x74, 0x0a, 0xac,
0x4e, 0x49, 0xdf, 0xe8, 0xf6, 0x7b, 0xe7, 0x37, 0x41, 0xa5, 0x64, 0xb6, 0x95, 0xa0, 0x39, 0xae,
0x5e, 0x96, 0x88, 0x6a, 0x8c, 0xa9, 0x6c, 0x6c, 0x70, 0xcf, 0x08, 0x0a, 0xfc, 0xb6, 0x3a, 0x09,
0x5d, 0xa4, 0xe9, 0x25, 0x8a, 0xc2, 0x27, 0x01, 0x9a, 0x91, 0x0d, 0x2f, 0x6e, 0xa1, 0xc3, 0x28,
0xe4, 0x17, 0x33, 0xc3, 0x5b, 0xc9, 0x17, 0xde, 0x26, 0xc5, 0x86, 0xd7, 0xec, 0x39, 0xbf, 0x29,
0x61, 0xee, 0xe7, 0x06, 0x3d, 0xf6, 0xe9, 0xa7, 0x2d, 0xa7, 0xfe, 0xe2, 0x1b, 0xe0, 0xd1, 0xb8,
0x39, 0x8f, 0x9e, 0x46, 0x01, 0x8d, 0xaf, 0xb0, 0x0d, 0x89, 0x3a, 0xd5, 0xda, 0x13, 0xb6, 0x4a,
0x99, 0x83, 0x9e, 0xdf, 0x9f, 0x78, 0x92, 0xf7, 0xbb, 0x63, 0x34, 0xf0, 0x82, 0xf4, 0x2f, 0x64,
0x9d, 0x10, 0x2e, 0x0d, 0x85, 0x06, 0xf9, 0xd5, 0x71, 0x6a, 0x56, 0xb3, 0x4b, 0x06, 0x2b, 0xa6,
0xf6, 0x3d, 0xed, 0xd5, 0x02, 0xd4, 0x7d, 0xac, 0xa4, 0x3d, 0x20, 0xe1, 0x47, 0x43, 0xc8, 0x26,
0xc6, 0x03, 0x8e, 0xa6, 0xa2, 0xe6, 0x78, 0x18, 0xfc, 0xcd, 0x31, 0xec, 0x20, 0x7f, 0xde, 0x3c,
0xab, 0x1a, 0xe7, 0x53, 0xca, 0x56, 0x3e, 0x4d, 0xe7, 0x41, 0x6e, 0x53, 0x80, 0xb5, 0x64, 0x1a,
0x85, 0xa0, 0x72, 0x8d, 0xa8, 0xc1, 0xf2, 0xc4, 0x94, 0x1a, 0x9f, 0xea, 0xb2, 0x78, 0x2c, 0xeb,
0x30, 0xba, 0x16, 0xb0, 0xf0, 0x8a, 0x53, 0xb6, 0x6c, 0x37, 0x16, 0xc8, 0xb1, 0xc5, 0x32, 0xd0,
0xbc, 0xa3, 0x84, 0xe6, 0x77, 0xed, 0x77, 0x59, 0xcc, 0x85, 0x04, 0x1d, 0xf4, 0x26, 0x87, 0x8e,
0x82, 0x8d, 0x01, 0x41, 0x33, 0xe5, 0x00, 0x00, 0x29, 0x0f, 0xa0, 0x00, 0x00, 0x80, 0x00, 0x00,
0x00,
},
}
)
// Verify that an empty packet is safely handled (no panics).
func TestParseUdp_emptyPacket(t *testing.T) {
dns := newDns(testing.Verbose())
packet := newPacket(forward, []byte{})
dns.ParseUdp(packet)
assert.Empty(t, dns.transactions.Size(), "There should be no transactions.")
client := dns.results.(*publish.ChanTransactions)
close(client.Channel)
assert.Nil(t, <-client.Channel, "No result should have been published.")
}
// Verify that a malformed packet is safely handled (no panics).
func TestParseUdp_malformedPacket(t *testing.T) {
dns := newDns(testing.Verbose())
garbage := []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13}
packet := newPacket(forward, garbage)
dns.ParseUdp(packet)
assert.Empty(t, dns.transactions.Size(), "There should be no transactions.")
// As a future addition, a malformed message should publish a result.
}
// Verify that the lone request packet is parsed.
func TestParseUdp_requestPacket(t *testing.T) {
dns := newDns(testing.Verbose())
packet := newPacket(forward, elasticA.request)
dns.ParseUdp(packet)
assert.Equal(t, 1, dns.transactions.Size(), "There should be one transaction.")
client := dns.results.(*publish.ChanTransactions)
close(client.Channel)
assert.Nil(t, <-client.Channel, "No result should have been published.")
}
// Verify that the lone response packet is parsed and that an error
// result is published.
func TestParseUdp_responseOnly(t *testing.T) {
dns := newDns(testing.Verbose())
q := elasticA
packet := newPacket(reverse, q.response)
dns.ParseUdp(packet)
m := expectResult(t, dns)
assert.Equal(t, "udp", mapValue(t, m, "transport"))
assert.Nil(t, mapValue(t, m, "bytes_in"))
assert.Equal(t, len(q.response), mapValue(t, m, "bytes_out"))
assert.Nil(t, mapValue(t, m, "responsetime"))
assert.Equal(t, common.ERROR_STATUS, mapValue(t, m, "status"))
assert.Equal(t, OrphanedResponse.Error(), mapValue(t, m, "notes"))
assertMapStrData(t, m, q)
}
// Verify that the first request is published without a response and that
// the status is error. This second packet will remain in the transaction
// map awaiting a response.
func TestParseUdp_duplicateRequests(t *testing.T) {
dns := newDns(testing.Verbose())
q := elasticA
packet := newPacket(forward, q.request)
dns.ParseUdp(packet)
assert.Equal(t, 1, dns.transactions.Size(), "There should be one transaction.")
packet = newPacket(forward, q.request)
dns.ParseUdp(packet)
assert.Equal(t, 1, dns.transactions.Size(), "There should be one transaction.")
m := expectResult(t, dns)
assert.Equal(t, "udp", mapValue(t, m, "transport"))
assert.Equal(t, len(q.request), mapValue(t, m, "bytes_in"))
assert.Nil(t, mapValue(t, m, "bytes_out"))
assert.Nil(t, mapValue(t, m, "responsetime"))
assert.Equal(t, common.ERROR_STATUS, mapValue(t, m, "status"))
assert.Equal(t, DuplicateQueryMsg.Error(), mapValue(t, m, "notes"))
}
// Verify that the request/response pair are parsed and that a result
// is published.
func TestParseUdp_requestResponse(t *testing.T) {
parseUdpRequestResponse(t, newDns(testing.Verbose()), elasticA)
}
// Verify all DNS test messages are parsed correctly.
func TestParseUdp_allTestMessages(t *testing.T) {
dns := newDns(testing.Verbose())
for _, q := range messages {
t.Logf("Testing with query for %s", q.q_name)
parseUdpRequestResponse(t, dns, q)
}
}
// Verify that expireTransaction publishes an event with an error status
// and note.
func TestExpireTransaction(t *testing.T) {
dns := newDns(testing.Verbose())
trans := newTransaction(time.Now(), DnsTuple{}, common.CmdlineTuple{})
trans.Request = &DnsMessage{
Data: &mkdns.Msg{
Question: []mkdns.Question{{}},
},
}
dns.expireTransaction(trans)
m := expectResult(t, dns)
assert.Nil(t, mapValue(t, m, "bytes_out"))
assert.Nil(t, mapValue(t, m, "responsetime"))
assert.Equal(t, common.ERROR_STATUS, mapValue(t, m, "status"))
assert.Equal(t, NoResponse.Error(), mapValue(t, m, "notes"))
}
// Verify that an empty DNS request packet can be published.
func TestPublishTransaction_emptyDnsRequest(t *testing.T) {
dns := newDns(testing.Verbose())
trans := newTransaction(time.Now(), DnsTuple{}, common.CmdlineTuple{})
trans.Request = &DnsMessage{
Data: &mkdns.Msg{},
}
dns.publishTransaction(trans)
m := expectResult(t, dns)
assert.Equal(t, common.ERROR_STATUS, mapValue(t, m, "status"))
}
// Verify that an empty DNS response packet can be published.
func TestPublishTransaction_emptyDnsResponse(t *testing.T) {
dns := newDns(testing.Verbose())
trans := newTransaction(time.Now(), DnsTuple{}, common.CmdlineTuple{})
trans.Response = &DnsMessage{
Data: &mkdns.Msg{},
}
dns.publishTransaction(trans)
m := expectResult(t, dns)
assert.Equal(t, common.ERROR_STATUS, mapValue(t, m, "status"))
}
func TestPublishTransaction_edns(t *testing.T) {
dns := newDns(testing.Verbose())
q := ednsSecA
packet := newPacket(forward, q.request)
dns.ParseUdp(packet)
assert.Equal(t, 1, dns.transactions.Size(), "There should be one transaction.")
packet = newPacket(reverse, q.response)
dns.ParseUdp(packet)
assert.Empty(t, dns.transactions.Size(), "There should be no transactions.")
m := expectResult(t, dns)
assert.Equal(t, "udp", mapValue(t, m, "transport"))
assert.Equal(t, len(q.request), mapValue(t, m, "bytes_in"))
assert.Equal(t, len(q.response), mapValue(t, m, "bytes_out"))
assert.NotNil(t, mapValue(t, m, "responsetime"))
assert.Equal(t, common.OK_STATUS, mapValue(t, m, "status"))
assert.Nil(t, mapValue(t, m, "notes"))
assertMapStrData(t, m, q)
}
// Verify that a non-edns answer to a edns query publishes Notes.
func TestPublishTransaction_respEdnsNoSupport(t *testing.T) {
dns := newDns(testing.Verbose())
q := ednsSecA
q.response = q.response[:len(q.response)-11] // Remove OPT RR
packet := newPacket(forward, q.request)
dns.ParseUdp(packet)
assert.Equal(t, 1, dns.transactions.Size(), "There should be one transaction.")
packet = newPacket(reverse, q.response)
dns.ParseUdp(packet)
assert.Empty(t, dns.transactions.Size(), "There should be no transactions.")
m := expectResult(t, dns)
assert.Equal(t, "udp", mapValue(t, m, "transport"))
assert.Equal(t, len(q.request), mapValue(t, m, "bytes_in"))
assert.Equal(t, len(q.response), mapValue(t, m, "bytes_out"))
assert.NotNil(t, mapValue(t, m, "responsetime"))
assert.Equal(t, common.OK_STATUS, mapValue(t, m, "status"))
assert.Equal(t, RespEdnsNoSupport.Error(), mapValue(t, m, "notes"))
assertRequest(t, m, q)
}
// Verify that a edns response to a non-edns query publishes Notes.
func TestPublishTransaction_respEdnsUnexpected(t *testing.T) {
dns := newDns(testing.Verbose())
q := ednsSecA
q.request = q.request[:len(q.request)-11] // Remove OPT RR
packet := newPacket(forward, q.request)
dns.ParseUdp(packet)
assert.Equal(t, 1, dns.transactions.Size(), "There should be one transaction.")
packet = newPacket(reverse, q.response)
dns.ParseUdp(packet)
assert.Empty(t, dns.transactions.Size(), "There should be no transactions.")
m := expectResult(t, dns)
assert.Equal(t, "udp", mapValue(t, m, "transport"))
assert.Equal(t, len(q.request), mapValue(t, m, "bytes_in"))
assert.Equal(t, len(q.response), mapValue(t, m, "bytes_out"))
assert.NotNil(t, mapValue(t, m, "responsetime"))
assert.Equal(t, common.OK_STATUS, mapValue(t, m, "status"))
assert.Equal(t, RespEdnsUnexpected.Error(), mapValue(t, m, "notes"))
assertMapStrData(t, m, q)
}
// Benchmarks UDP parsing for the given test message.
func benchmarkUdp(b *testing.B, q DnsTestMessage) {
dns := newDns(false)
for i := 0; i < b.N; i++ {
packet := newPacket(forward, q.request)
dns.ParseUdp(packet)
packet = newPacket(reverse, q.response)
dns.ParseUdp(packet)
client := dns.results.(*publish.ChanTransactions)
<-client.Channel
}
}
// Benchmark UDP parsing against each test message.
func BenchmarkUdpElasticA(b *testing.B) { benchmarkUdp(b, elasticA) }
func BenchmarkUdpZoneIxfr(b *testing.B) { benchmarkUdp(b, zoneIxfr) }
func BenchmarkUdpGithubPtr(b *testing.B) { benchmarkUdp(b, githubPtr) }
func BenchmarkUdpSophosTxt(b *testing.B) { benchmarkUdp(b, sophosTxt) }
// Benchmark that runs with parallelism to help find concurrency related
// issues. To run with parallelism, the 'go test' cpu flag must be set
// greater than 1, otherwise it just runs concurrently but not in parallel.
func BenchmarkParallelUdpParse(b *testing.B) {
rand.Seed(22)
numMessages := len(messages)
dns := newDns(false)
client := dns.results.(*publish.ChanTransactions)
// Drain the results channal while the test is running.
go func() {
totalMessages := 0
for r := range client.Channel {
_ = r
totalMessages++
}
fmt.Printf("Parsed %d messages.\n", totalMessages)
}()
b.ResetTimer()
b.RunParallel(func(pb *testing.PB) {
// Each iteration parses one message, either a request or a response.
// The request and response could be parsed on different goroutines.
for pb.Next() {
q := messages[rand.Intn(numMessages)]
var packet *protos.Packet
if rand.Intn(2) == 0 {
packet = newPacket(forward, q.request)
} else {
packet = newPacket(reverse, q.response)
}
dns.ParseUdp(packet)
}
})
defer close(client.Channel)
}
// parseUdpRequestResponse parses a request then a response packet and validates
// the published result.
func parseUdpRequestResponse(t testing.TB, dns *Dns, q DnsTestMessage) {
packet := newPacket(forward, q.request)
dns.ParseUdp(packet)
packet = newPacket(reverse, q.response)
dns.ParseUdp(packet)
assert.Empty(t, dns.transactions.Size(), "There should be no transactions.")
m := expectResult(t, dns)
assert.Equal(t, "udp", mapValue(t, m, "transport"))
assert.Equal(t, len(q.request), mapValue(t, m, "bytes_in"))
assert.Equal(t, len(q.response), mapValue(t, m, "bytes_out"))
assert.NotNil(t, mapValue(t, m, "responsetime"))
if assert.ObjectsAreEqual("NOERROR", mapValue(t, m, "dns.response_code")) {
assert.Equal(t, common.OK_STATUS, mapValue(t, m, "status"))
} else {
assert.Equal(t, common.ERROR_STATUS, mapValue(t, m, "status"))
}
assert.Nil(t, mapValue(t, m, "notes"))
assertMapStrData(t, m, q)
}