73 lines
1.5 KiB
Go
73 lines
1.5 KiB
Go
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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build darwin dragonfly freebsd netbsd openbsd
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package route
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// A Message represents a routing message.
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type Message interface {
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// Sys returns operating system-specific information.
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Sys() []Sys
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}
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// A Sys reprensents operating system-specific information.
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type Sys interface {
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// SysType returns a type of operating system-specific
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// information.
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SysType() SysType
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}
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// A SysType represents a type of operating system-specific
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// information.
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type SysType int
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const (
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SysMetrics SysType = iota
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SysStats
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)
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// ParseRIB parses b as a routing information base and returns a list
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// of routing messages.
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func ParseRIB(typ RIBType, b []byte) ([]Message, error) {
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if !typ.parseable() {
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return nil, errUnsupportedMessage
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}
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var msgs []Message
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nmsgs, nskips := 0, 0
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for len(b) > 4 {
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nmsgs++
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l := int(nativeEndian.Uint16(b[:2]))
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if l == 0 {
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return nil, errInvalidMessage
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}
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if len(b) < l {
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return nil, errMessageTooShort
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}
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if b[2] != sysRTM_VERSION {
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b = b[l:]
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continue
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}
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if w, ok := wireFormats[int(b[3])]; !ok {
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nskips++
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} else {
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m, err := w.parse(typ, b)
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if err != nil {
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return nil, err
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}
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if m == nil {
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nskips++
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} else {
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msgs = append(msgs, m)
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}
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}
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b = b[l:]
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}
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// We failed to parse any of the messages - version mismatch?
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if nmsgs != len(msgs)+nskips {
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return nil, errMessageMismatch
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}
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return msgs, nil
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}
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