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