1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
|
// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
//
// Copyright 2016 The Go-MySQL-Driver Authors. All rights reserved.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.
package mysql
import (
"errors"
"net"
"testing"
"time"
)
var (
errConnClosed = errors.New("connection is closed")
errConnTooManyReads = errors.New("too many reads")
errConnTooManyWrites = errors.New("too many writes")
)
// struct to mock a net.Conn for testing purposes
type mockConn struct {
laddr net.Addr
raddr net.Addr
data []byte
closed bool
read int
written int
reads int
writes int
maxReads int
maxWrites int
}
func (m *mockConn) Read(b []byte) (n int, err error) {
if m.closed {
return 0, errConnClosed
}
m.reads++
if m.maxReads > 0 && m.reads > m.maxReads {
return 0, errConnTooManyReads
}
n = copy(b, m.data)
m.read += n
m.data = m.data[n:]
return
}
func (m *mockConn) Write(b []byte) (n int, err error) {
if m.closed {
return 0, errConnClosed
}
m.writes++
if m.maxWrites > 0 && m.writes > m.maxWrites {
return 0, errConnTooManyWrites
}
n = len(b)
m.written += n
return
}
func (m *mockConn) Close() error {
m.closed = true
return nil
}
func (m *mockConn) LocalAddr() net.Addr {
return m.laddr
}
func (m *mockConn) RemoteAddr() net.Addr {
return m.raddr
}
func (m *mockConn) SetDeadline(t time.Time) error {
return nil
}
func (m *mockConn) SetReadDeadline(t time.Time) error {
return nil
}
func (m *mockConn) SetWriteDeadline(t time.Time) error {
return nil
}
// make sure mockConn implements the net.Conn interface
var _ net.Conn = new(mockConn)
func TestReadPacketSingleByte(t *testing.T) {
conn := new(mockConn)
mc := &mysqlConn{
buf: newBuffer(conn),
}
conn.data = []byte{0x01, 0x00, 0x00, 0x00, 0xff}
conn.maxReads = 1
packet, err := mc.readPacket()
if err != nil {
t.Fatal(err)
}
if len(packet) != 1 {
t.Fatalf("unexpected packet length: expected %d, got %d", 1, len(packet))
}
if packet[0] != 0xff {
t.Fatalf("unexpected packet content: expected %x, got %x", 0xff, packet[0])
}
}
func TestReadPacketWrongSequenceID(t *testing.T) {
conn := new(mockConn)
mc := &mysqlConn{
buf: newBuffer(conn),
}
// too low sequence id
conn.data = []byte{0x01, 0x00, 0x00, 0x00, 0xff}
conn.maxReads = 1
mc.sequence = 1
_, err := mc.readPacket()
if err != ErrPktSync {
t.Errorf("expected ErrPktSync, got %v", err)
}
// reset
conn.reads = 0
mc.sequence = 0
mc.buf = newBuffer(conn)
// too high sequence id
conn.data = []byte{0x01, 0x00, 0x00, 0x42, 0xff}
_, err = mc.readPacket()
if err != ErrPktSyncMul {
t.Errorf("expected ErrPktSyncMul, got %v", err)
}
}
func TestReadPacketSplit(t *testing.T) {
conn := new(mockConn)
mc := &mysqlConn{
buf: newBuffer(conn),
}
data := make([]byte, maxPacketSize*2+4*3)
const pkt2ofs = maxPacketSize + 4
const pkt3ofs = 2 * (maxPacketSize + 4)
// case 1: payload has length maxPacketSize
data = data[:pkt2ofs+4]
// 1st packet has maxPacketSize length and sequence id 0
// ff ff ff 00 ...
data[0] = 0xff
data[1] = 0xff
data[2] = 0xff
// mark the payload start and end of 1st packet so that we can check if the
// content was correctly appended
data[4] = 0x11
data[maxPacketSize+3] = 0x22
// 2nd packet has payload length 0 and squence id 1
// 00 00 00 01
data[pkt2ofs+3] = 0x01
conn.data = data
conn.maxReads = 3
packet, err := mc.readPacket()
if err != nil {
t.Fatal(err)
}
if len(packet) != maxPacketSize {
t.Fatalf("unexpected packet length: expected %d, got %d", maxPacketSize, len(packet))
}
if packet[0] != 0x11 {
t.Fatalf("unexpected payload start: expected %x, got %x", 0x11, packet[0])
}
if packet[maxPacketSize-1] != 0x22 {
t.Fatalf("unexpected payload end: expected %x, got %x", 0x22, packet[maxPacketSize-1])
}
// case 2: payload has length which is a multiple of maxPacketSize
data = data[:cap(data)]
// 2nd packet now has maxPacketSize length
data[pkt2ofs] = 0xff
data[pkt2ofs+1] = 0xff
data[pkt2ofs+2] = 0xff
// mark the payload start and end of the 2nd packet
data[pkt2ofs+4] = 0x33
data[pkt2ofs+maxPacketSize+3] = 0x44
// 3rd packet has payload length 0 and squence id 2
// 00 00 00 02
data[pkt3ofs+3] = 0x02
conn.data = data
conn.reads = 0
conn.maxReads = 5
mc.sequence = 0
packet, err = mc.readPacket()
if err != nil {
t.Fatal(err)
}
if len(packet) != 2*maxPacketSize {
t.Fatalf("unexpected packet length: expected %d, got %d", 2*maxPacketSize, len(packet))
}
if packet[0] != 0x11 {
t.Fatalf("unexpected payload start: expected %x, got %x", 0x11, packet[0])
}
if packet[2*maxPacketSize-1] != 0x44 {
t.Fatalf("unexpected payload end: expected %x, got %x", 0x44, packet[2*maxPacketSize-1])
}
// case 3: payload has a length larger maxPacketSize, which is not an exact
// multiple of it
data = data[:pkt2ofs+4+42]
data[pkt2ofs] = 0x2a
data[pkt2ofs+1] = 0x00
data[pkt2ofs+2] = 0x00
data[pkt2ofs+4+41] = 0x44
conn.data = data
conn.reads = 0
conn.maxReads = 4
mc.sequence = 0
packet, err = mc.readPacket()
if err != nil {
t.Fatal(err)
}
if len(packet) != maxPacketSize+42 {
t.Fatalf("unexpected packet length: expected %d, got %d", maxPacketSize+42, len(packet))
}
if packet[0] != 0x11 {
t.Fatalf("unexpected payload start: expected %x, got %x", 0x11, packet[0])
}
if packet[maxPacketSize+41] != 0x44 {
t.Fatalf("unexpected payload end: expected %x, got %x", 0x44, packet[maxPacketSize+41])
}
}
func TestReadPacketFail(t *testing.T) {
conn := new(mockConn)
mc := &mysqlConn{
buf: newBuffer(conn),
closech: make(chan struct{}),
}
// illegal empty (stand-alone) packet
conn.data = []byte{0x00, 0x00, 0x00, 0x00}
conn.maxReads = 1
_, err := mc.readPacket()
if err != ErrInvalidConn {
t.Errorf("expected ErrInvalidConn, got %v", err)
}
// reset
conn.reads = 0
mc.sequence = 0
mc.buf = newBuffer(conn)
// fail to read header
conn.closed = true
_, err = mc.readPacket()
if err != ErrInvalidConn {
t.Errorf("expected ErrInvalidConn, got %v", err)
}
// reset
conn.closed = false
conn.reads = 0
mc.sequence = 0
mc.buf = newBuffer(conn)
// fail to read body
conn.maxReads = 1
_, err = mc.readPacket()
if err != ErrInvalidConn {
t.Errorf("expected ErrInvalidConn, got %v", err)
}
}
|
