1package dns
2
3import (
4	"bytes"
5	"testing"
6)
7
8func TestDynamicUpdateParsing(t *testing.T) {
9	prefix := "example.com. IN "
10	for _, typ := range TypeToString {
11		if typ == "OPT" || typ == "AXFR" || typ == "IXFR" || typ == "ANY" || typ == "TKEY" ||
12			typ == "TSIG" || typ == "ISDN" || typ == "UNSPEC" || typ == "NULL" || typ == "ATMA" ||
13			typ == "Reserved" || typ == "None" || typ == "NXT" || typ == "MAILB" || typ == "MAILA" {
14			continue
15		}
16		r, err := NewRR(prefix + typ)
17		if err != nil {
18			t.Errorf("failure to parse: %s %s: %v", prefix, typ, err)
19		} else {
20			t.Logf("parsed: %s", r.String())
21		}
22	}
23}
24
25func TestDynamicUpdateUnpack(t *testing.T) {
26	// From https://github.com/miekg/dns/issues/150#issuecomment-62296803
27	// It should be an update message for the zone "example.",
28	// deleting the A RRset "example." and then adding an A record at "example.".
29	// class ANY, TYPE A
30	buf := []byte{171, 68, 40, 0, 0, 1, 0, 0, 0, 2, 0, 0, 7, 101, 120, 97, 109, 112, 108, 101, 0, 0, 6, 0, 1, 192, 12, 0, 1, 0, 255, 0, 0, 0, 0, 0, 0, 192, 12, 0, 1, 0, 1, 0, 0, 0, 0, 0, 4, 127, 0, 0, 1}
31	msg := new(Msg)
32	err := msg.Unpack(buf)
33	if err != nil {
34		t.Errorf("failed to unpack: %v\n%s", err, msg.String())
35	}
36}
37
38func TestDynamicUpdateZeroRdataUnpack(t *testing.T) {
39	m := new(Msg)
40	rr := &RR_Header{Name: ".", Rrtype: 0, Class: 1, Ttl: ^uint32(0), Rdlength: 0}
41	m.Answer = []RR{rr, rr, rr, rr, rr}
42	m.Ns = m.Answer
43	for n, s := range TypeToString {
44		rr.Rrtype = n
45		bytes, err := m.Pack()
46		if err != nil {
47			t.Errorf("failed to pack %s: %v", s, err)
48			continue
49		}
50		if err := new(Msg).Unpack(bytes); err != nil {
51			t.Errorf("failed to unpack %s: %v", s, err)
52		}
53	}
54}
55
56func TestRemoveRRset(t *testing.T) {
57	// Should add a zero data RR in Class ANY with a TTL of 0
58	// for each set mentioned in the RRs provided to it.
59	rr, err := NewRR(". 100 IN A 127.0.0.1")
60	if err != nil {
61		t.Fatalf("error constructing RR: %v", err)
62	}
63	m := new(Msg)
64	m.Ns = []RR{&RR_Header{Name: ".", Rrtype: TypeA, Class: ClassANY, Ttl: 0, Rdlength: 0}}
65	expectstr := m.String()
66	expect, err := m.Pack()
67	if err != nil {
68		t.Fatalf("error packing expected msg: %v", err)
69	}
70
71	m.Ns = nil
72	m.RemoveRRset([]RR{rr})
73	actual, err := m.Pack()
74	if err != nil {
75		t.Fatalf("error packing actual msg: %v", err)
76	}
77	if !bytes.Equal(actual, expect) {
78		tmp := new(Msg)
79		if err := tmp.Unpack(actual); err != nil {
80			t.Fatalf("error unpacking actual msg: %v\nexpected: %v\ngot: %v\n", err, expect, actual)
81		}
82		t.Errorf("expected msg:\n%s", expectstr)
83		t.Errorf("actual msg:\n%v", tmp)
84	}
85}
86
87func TestPreReqAndRemovals(t *testing.T) {
88	// Build a list of multiple prereqs and then somes removes followed by an insert.
89	// We should be able to add multiple prereqs and updates.
90	m := new(Msg)
91	m.SetUpdate("example.org.")
92	m.Id = 1234
93
94	// Use a full set of RRs each time, so we are sure the rdata is stripped.
95	rrName1, _ := NewRR("name_used. 3600 IN A 127.0.0.1")
96	rrName2, _ := NewRR("name_not_used. 3600 IN A 127.0.0.1")
97	rrRemove1, _ := NewRR("remove1. 3600 IN A 127.0.0.1")
98	rrRemove2, _ := NewRR("remove2. 3600 IN A 127.0.0.1")
99	rrRemove3, _ := NewRR("remove3. 3600 IN A 127.0.0.1")
100	rrInsert, _ := NewRR("insert. 3600 IN A 127.0.0.1")
101	rrRrset1, _ := NewRR("rrset_used1. 3600 IN A 127.0.0.1")
102	rrRrset2, _ := NewRR("rrset_used2. 3600 IN A 127.0.0.1")
103	rrRrset3, _ := NewRR("rrset_not_used. 3600 IN A 127.0.0.1")
104
105	// Handle the prereqs.
106	m.NameUsed([]RR{rrName1})
107	m.NameNotUsed([]RR{rrName2})
108	m.RRsetUsed([]RR{rrRrset1})
109	m.Used([]RR{rrRrset2})
110	m.RRsetNotUsed([]RR{rrRrset3})
111
112	// and now the updates.
113	m.RemoveName([]RR{rrRemove1})
114	m.RemoveRRset([]RR{rrRemove2})
115	m.Remove([]RR{rrRemove3})
116	m.Insert([]RR{rrInsert})
117
118	// This test function isn't a Example function because we print these RR with tabs at the
119	// end and the Example function trim these, thus they never match.
120	// TODO(miek): don't print these tabs and make this into an Example function.
121	expect := `;; opcode: UPDATE, status: NOERROR, id: 1234
122;; flags:; QUERY: 1, ANSWER: 5, AUTHORITY: 4, ADDITIONAL: 0
123
124;; QUESTION SECTION:
125;example.org.	IN	 SOA
126
127;; ANSWER SECTION:
128name_used.	0	ANY	ANY
129name_not_used.	0	NONE	ANY
130rrset_used1.	0	ANY	A
131rrset_used2.	3600	IN	A	127.0.0.1
132rrset_not_used.	0	NONE	A
133
134;; AUTHORITY SECTION:
135remove1.	0	ANY	ANY
136remove2.	0	ANY	A
137remove3.	0	NONE	A	127.0.0.1
138insert.	3600	IN	A	127.0.0.1
139`
140
141	if m.String() != expect {
142		t.Errorf("expected msg:\n%s", expect)
143		t.Errorf("actual msg:\n%v", m.String())
144	}
145}
146