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41bba8d80b
This change adds the Marshal method of RouteMessage to make it possible to exchange route messages between userspace processes and the kernel for the manipulation of routing information base inside the kernel. Change-Id: I0cf2c1a391820f41eb9c5eac1c172598cb2e1533 Reviewed-on: https://go-review.googlesource.com/36077 Reviewed-by: Ian Lance Taylor <iant@golang.org>
73 lines
1.5 KiB
Go
73 lines
1.5 KiB
Go
// 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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