consul/agent/dns/router_addr_test.go

// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: BUSL-1.1

package dns

import (
	"net"
	"testing"
	"time"

	"github.com/miekg/dns"
)

func Test_HandleRequest_ADDR(t *testing.T) {
	testCases := []HandleTestCase{
		{
			name: "test A 'addr.' query, ipv4 response",
			request: &dns.Msg{
				MsgHdr: dns.MsgHdr{
					Opcode: dns.OpcodeQuery,
				},
				Question: []dns.Question{
					{
						Name:   "c000020a.addr.dc1.consul", // "intentionally missing the trailing dot"
						Qtype:  dns.TypeA,
						Qclass: dns.ClassINET,
					},
				},
			},
			response: &dns.Msg{
				MsgHdr: dns.MsgHdr{
					Opcode:        dns.OpcodeQuery,
					Response:      true,
					Authoritative: true,
				},
				Compress: true,
				Question: []dns.Question{
					{
						Name:   "c000020a.addr.dc1.consul.",
						Qtype:  dns.TypeA,
						Qclass: dns.ClassINET,
					},
				},
				Answer: []dns.RR{
					&dns.A{
						Hdr: dns.RR_Header{
							Name:   "c000020a.addr.dc1.consul.",
							Rrtype: dns.TypeA,
							Class:  dns.ClassINET,
							Ttl:    123,
						},
						A: net.ParseIP("192.0.2.10"),
					},
				},
			},
		},
		{
			name: "test AAAA 'addr.' query, ipv4 response",
			// Since we asked for an AAAA record, the A record that resolves from the address is attached as an extra
			request: &dns.Msg{
				MsgHdr: dns.MsgHdr{
					Opcode: dns.OpcodeQuery,
				},
				Question: []dns.Question{
					{
						Name:   "c000020a.addr.dc1.consul",
						Qtype:  dns.TypeAAAA,
						Qclass: dns.ClassINET,
					},
				},
			},
			response: &dns.Msg{
				MsgHdr: dns.MsgHdr{
					Opcode:        dns.OpcodeQuery,
					Response:      true,
					Authoritative: true,
				},
				Compress: true,
				Question: []dns.Question{
					{
						Name:   "c000020a.addr.dc1.consul.",
						Qtype:  dns.TypeAAAA,
						Qclass: dns.ClassINET,
					},
				},
				Extra: []dns.RR{
					&dns.A{
						Hdr: dns.RR_Header{
							Name:   "c000020a.addr.dc1.consul.",
							Rrtype: dns.TypeA,
							Class:  dns.ClassINET,
							Ttl:    123,
						},
						A: net.ParseIP("192.0.2.10"),
					},
				},
			},
		},
		{
			name: "test SRV 'addr.' query, ipv4 response",
			// Since we asked for a SRV record, the A record that resolves from the address is attached as an extra
			request: &dns.Msg{
				MsgHdr: dns.MsgHdr{
					Opcode: dns.OpcodeQuery,
				},
				Question: []dns.Question{
					{
						Name:   "c000020a.addr.dc1.consul",
						Qtype:  dns.TypeSRV,
						Qclass: dns.ClassINET,
					},
				},
			},
			response: &dns.Msg{
				MsgHdr: dns.MsgHdr{
					Opcode:        dns.OpcodeQuery,
					Response:      true,
					Authoritative: true,
				},
				Compress: true,
				Question: []dns.Question{
					{
						Name:   "c000020a.addr.dc1.consul.",
						Qtype:  dns.TypeSRV,
						Qclass: dns.ClassINET,
					},
				},
				Extra: []dns.RR{
					&dns.A{
						Hdr: dns.RR_Header{
							Name:   "c000020a.addr.dc1.consul.",
							Rrtype: dns.TypeA,
							Class:  dns.ClassINET,
							Ttl:    123,
						},
						A: net.ParseIP("192.0.2.10"),
					},
				},
			},
		},
		{
			name: "test ANY 'addr.' query, ipv4 response",
			// The response to ANY should look the same as the A response
			request: &dns.Msg{
				MsgHdr: dns.MsgHdr{
					Opcode: dns.OpcodeQuery,
				},
				Question: []dns.Question{
					{
						Name:   "c000020a.addr.dc1.consul",
						Qtype:  dns.TypeANY,
						Qclass: dns.ClassINET,
					},
				},
			},
			response: &dns.Msg{
				MsgHdr: dns.MsgHdr{
					Opcode:        dns.OpcodeQuery,
					Response:      true,
					Authoritative: true,
				},
				Compress: true,
				Question: []dns.Question{
					{
						Name:   "c000020a.addr.dc1.consul.",
						Qtype:  dns.TypeANY,
						Qclass: dns.ClassINET,
					},
				},
				Answer: []dns.RR{
					&dns.A{
						Hdr: dns.RR_Header{
							Name:   "c000020a.addr.dc1.consul.",
							Rrtype: dns.TypeA,
							Class:  dns.ClassINET,
							Ttl:    123,
						},
						A: net.ParseIP("192.0.2.10"),
					},
				},
			},
		},
		{
			name: "test AAAA 'addr.' query, ipv6 response",
			request: &dns.Msg{
				MsgHdr: dns.MsgHdr{
					Opcode: dns.OpcodeQuery,
				},
				Question: []dns.Question{
					{
						Name:   "20010db800010002cafe000000001337.addr.dc1.consul",
						Qtype:  dns.TypeAAAA,
						Qclass: dns.ClassINET,
					},
				},
			},
			response: &dns.Msg{
				MsgHdr: dns.MsgHdr{
					Opcode:        dns.OpcodeQuery,
					Response:      true,
					Authoritative: true,
				},
				Compress: true,
				Question: []dns.Question{
					{
						Name:   "20010db800010002cafe000000001337.addr.dc1.consul.",
						Qtype:  dns.TypeAAAA,
						Qclass: dns.ClassINET,
					},
				},
				Answer: []dns.RR{
					&dns.AAAA{
						Hdr: dns.RR_Header{
							Name:   "20010db800010002cafe000000001337.addr.dc1.consul.",
							Rrtype: dns.TypeAAAA,
							Class:  dns.ClassINET,
							Ttl:    123,
						},
						AAAA: net.ParseIP("2001:db8:1:2:cafe::1337"),
					},
				},
			},
		},
		{
			name: "test A 'addr.' query, ipv6 response",
			// Since we asked for an A record, the AAAA record that resolves from the address is attached as an extra
			request: &dns.Msg{
				MsgHdr: dns.MsgHdr{
					Opcode: dns.OpcodeQuery,
				},
				Question: []dns.Question{
					{
						Name:   "20010db800010002cafe000000001337.addr.dc1.consul",
						Qtype:  dns.TypeA,
						Qclass: dns.ClassINET,
					},
				},
			},
			response: &dns.Msg{
				MsgHdr: dns.MsgHdr{
					Opcode:        dns.OpcodeQuery,
					Response:      true,
					Authoritative: true,
				},
				Compress: true,
				Question: []dns.Question{
					{
						Name:   "20010db800010002cafe000000001337.addr.dc1.consul.",
						Qtype:  dns.TypeA,
						Qclass: dns.ClassINET,
					},
				},
				Extra: []dns.RR{
					&dns.AAAA{
						Hdr: dns.RR_Header{
							Name:   "20010db800010002cafe000000001337.addr.dc1.consul.",
							Rrtype: dns.TypeAAAA,
							Class:  dns.ClassINET,
							Ttl:    123,
						},
						AAAA: net.ParseIP("2001:db8:1:2:cafe::1337"),
					},
				},
			},
		},
		{
			name: "test SRV 'addr.' query, ipv6 response",
			// Since we asked for an SRV record, the AAAA record that resolves from the address is attached as an extra
			request: &dns.Msg{
				MsgHdr: dns.MsgHdr{
					Opcode: dns.OpcodeQuery,
				},
				Question: []dns.Question{
					{
						Name:   "20010db800010002cafe000000001337.addr.dc1.consul",
						Qtype:  dns.TypeSRV,
						Qclass: dns.ClassINET,
					},
				},
			},
			response: &dns.Msg{
				MsgHdr: dns.MsgHdr{
					Opcode:        dns.OpcodeQuery,
					Response:      true,
					Authoritative: true,
				},
				Compress: true,
				Question: []dns.Question{
					{
						Name:   "20010db800010002cafe000000001337.addr.dc1.consul.",
						Qtype:  dns.TypeSRV,
						Qclass: dns.ClassINET,
					},
				},
				Extra: []dns.RR{
					&dns.AAAA{
						Hdr: dns.RR_Header{
							Name:   "20010db800010002cafe000000001337.addr.dc1.consul.",
							Rrtype: dns.TypeAAAA,
							Class:  dns.ClassINET,
							Ttl:    123,
						},
						AAAA: net.ParseIP("2001:db8:1:2:cafe::1337"),
					},
				},
			},
		},
		{
			name: "test ANY 'addr.' query, ipv6 response",
			// The response to ANY should look the same as the AAAA response
			request: &dns.Msg{
				MsgHdr: dns.MsgHdr{
					Opcode: dns.OpcodeQuery,
				},
				Question: []dns.Question{
					{
						Name:   "20010db800010002cafe000000001337.addr.dc1.consul",
						Qtype:  dns.TypeANY,
						Qclass: dns.ClassINET,
					},
				},
			},
			response: &dns.Msg{
				MsgHdr: dns.MsgHdr{
					Opcode:        dns.OpcodeQuery,
					Response:      true,
					Authoritative: true,
				},
				Compress: true,
				Question: []dns.Question{
					{
						Name:   "20010db800010002cafe000000001337.addr.dc1.consul.",
						Qtype:  dns.TypeANY,
						Qclass: dns.ClassINET,
					},
				},
				Answer: []dns.RR{
					&dns.AAAA{
						Hdr: dns.RR_Header{
							Name:   "20010db800010002cafe000000001337.addr.dc1.consul.",
							Rrtype: dns.TypeAAAA,
							Class:  dns.ClassINET,
							Ttl:    123,
						},
						AAAA: net.ParseIP("2001:db8:1:2:cafe::1337"),
					},
				},
			},
		},
		{
			name: "test malformed 'addr.' query",
			request: &dns.Msg{
				MsgHdr: dns.MsgHdr{
					Opcode: dns.OpcodeQuery,
				},
				Question: []dns.Question{
					{
						Name:   "c000.addr.dc1.consul", // too short
						Qtype:  dns.TypeA,
						Qclass: dns.ClassINET,
					},
				},
			},
			response: &dns.Msg{
				MsgHdr: dns.MsgHdr{
					Opcode:        dns.OpcodeQuery,
					Response:      true,
					Rcode:         dns.RcodeNameError, // NXDOMAIN
					Authoritative: true,
				},
				Compress: true,
				Question: []dns.Question{
					{
						Name:   "c000.addr.dc1.consul.",
						Qtype:  dns.TypeA,
						Qclass: dns.ClassINET,
					},
				},
				Ns: []dns.RR{
					&dns.SOA{
						Hdr: dns.RR_Header{
							Name:   "consul.",
							Rrtype: dns.TypeSOA,
							Class:  dns.ClassINET,
							Ttl:    4,
						},
						Ns:      "ns.consul.",
						Serial:  uint32(time.Now().Unix()),
						Mbox:    "hostmaster.consul.",
						Refresh: 1,
						Expire:  3,
						Retry:   2,
						Minttl:  4,
					},
				},
			},
		},
	}

	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			runHandleTestCases(t, tc)
		})
	}
}