66 lines
1.7 KiB
Go
66 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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package route
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import "syscall"
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func (m *RouteMessage) marshal() ([]byte, error) {
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l := sizeofRtMsghdr + 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.PutUint16(b[4:6], uint16(sizeofRtMsghdr))
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nativeEndian.PutUint32(b[16:20], uint32(m.Flags))
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nativeEndian.PutUint16(b[6:8], uint16(m.Index))
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nativeEndian.PutUint32(b[24:28], uint32(m.ID))
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nativeEndian.PutUint32(b[28:32], uint32(m.Seq))
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attrs, err := marshalAddrs(b[sizeofRtMsghdr:], 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 (*wireFormat) parseRouteMessage(_ RIBType, b []byte) (Message, error) {
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if len(b) < sizeofRtMsghdr {
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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[16:20])),
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Index: int(nativeEndian.Uint16(b[6:8])),
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ID: uintptr(nativeEndian.Uint32(b[24:28])),
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Seq: int(nativeEndian.Uint32(b[28:32])),
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raw: b[:l],
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}
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ll := int(nativeEndian.Uint16(b[4:6]))
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if len(b) < ll {
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return nil, errInvalidMessage
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}
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errno := syscall.Errno(nativeEndian.Uint32(b[32:36]))
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if errno != 0 {
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m.Err = errno
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}
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as, err := parseAddrs(uint(nativeEndian.Uint32(b[12:16])), parseKernelInetAddr, b[ll:])
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if err != nil {
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return nil, err
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}
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m.Addrs = as
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return m, nil
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}
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