68 lines
1.7 KiB
Go
68 lines
1.7 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
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package route
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import "syscall"
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func (m *RouteMessage) marshal() ([]byte, error) {
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w, ok := wireFormats[m.Type]
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if !ok {
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return nil, errUnsupportedMessage
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}
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l := w.bodyOff + addrsSpace(m.Addrs)
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b := make([]byte, l)
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nativeEndian.PutUint16(b[:2], uint16(l))
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if m.Version == 0 {
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b[2] = sysRTM_VERSION
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} else {
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b[2] = byte(m.Version)
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}
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b[3] = byte(m.Type)
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nativeEndian.PutUint32(b[8:12], uint32(m.Flags))
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nativeEndian.PutUint16(b[4:6], uint16(m.Index))
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nativeEndian.PutUint32(b[16:20], uint32(m.ID))
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nativeEndian.PutUint32(b[20:24], uint32(m.Seq))
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attrs, err := marshalAddrs(b[w.bodyOff:], m.Addrs)
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if err != nil {
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return nil, err
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}
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if attrs > 0 {
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nativeEndian.PutUint32(b[12:16], uint32(attrs))
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}
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return b, nil
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}
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func (w *wireFormat) parseRouteMessage(typ RIBType, b []byte) (Message, error) {
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if len(b) < w.bodyOff {
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return nil, errMessageTooShort
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}
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l := int(nativeEndian.Uint16(b[:2]))
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if len(b) < l {
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return nil, errInvalidMessage
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}
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m := &RouteMessage{
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Version: int(b[2]),
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Type: int(b[3]),
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Flags: int(nativeEndian.Uint32(b[8:12])),
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Index: int(nativeEndian.Uint16(b[4:6])),
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ID: uintptr(nativeEndian.Uint32(b[16:20])),
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Seq: int(nativeEndian.Uint32(b[20:24])),
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extOff: w.extOff,
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raw: b[:l],
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}
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errno := syscall.Errno(nativeEndian.Uint32(b[28:32]))
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if errno != 0 {
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m.Err = errno
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}
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var err error
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m.Addrs, err = parseAddrs(uint(nativeEndian.Uint32(b[12:16])), parseKernelInetAddr, b[w.bodyOff:])
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if err != nil {
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return nil, err
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}
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return m, nil
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}
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