| // 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 |
| } |