blob: f08dfc25dd06a98b07ab312621320b95d6837602 (
plain) (
blame)
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
|
// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build darwin || dragonfly || freebsd || netbsd || openbsd
package routebsd
// A Message represents a routing message.
type Message interface {
message()
}
// parseRIB parses b as a routing information base and returns a list
// of routing messages.
func parseRIB(b []byte) ([]Message, error) {
var msgs []Message
nmsgs, nskips := 0, 0
for len(b) > 4 {
nmsgs++
l := int(nativeEndian.Uint16(b[:2]))
if l == 0 {
return nil, errInvalidMessage
}
if len(b) < l {
return nil, errMessageTooShort
}
if b[2] != rtmVersion {
b = b[l:]
continue
}
if w, ok := wireFormats[int(b[3])]; !ok {
nskips++
} else {
m, err := w.parse(b[:l])
if err != nil {
return nil, err
}
if m == nil {
nskips++
} else {
msgs = append(msgs, m)
}
}
b = b[l:]
}
// We failed to parse any of the messages - version mismatch?
if nmsgs != len(msgs)+nskips {
return nil, errMessageMismatch
}
return msgs, nil
}
|
