Source file src/vendor/golang.org/x/net/route/route_classic.go

     1	// Copyright 2016 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	// +build darwin dragonfly freebsd netbsd
     6	
     7	package route
     8	
     9	import (
    10		"runtime"
    11		"syscall"
    12	)
    13	
    14	func (m *RouteMessage) marshal() ([]byte, error) {
    15		w, ok := wireFormats[m.Type]
    16		if !ok {
    17			return nil, errUnsupportedMessage
    18		}
    19		l := w.bodyOff + addrsSpace(m.Addrs)
    20		if runtime.GOOS == "darwin" {
    21			// Fix stray pointer writes on macOS.
    22			// See golang.org/issue/22456.
    23			l += 1024
    24		}
    25		b := make([]byte, l)
    26		nativeEndian.PutUint16(b[:2], uint16(l))
    27		if m.Version == 0 {
    28			b[2] = sysRTM_VERSION
    29		} else {
    30			b[2] = byte(m.Version)
    31		}
    32		b[3] = byte(m.Type)
    33		nativeEndian.PutUint32(b[8:12], uint32(m.Flags))
    34		nativeEndian.PutUint16(b[4:6], uint16(m.Index))
    35		nativeEndian.PutUint32(b[16:20], uint32(m.ID))
    36		nativeEndian.PutUint32(b[20:24], uint32(m.Seq))
    37		attrs, err := marshalAddrs(b[w.bodyOff:], m.Addrs)
    38		if err != nil {
    39			return nil, err
    40		}
    41		if attrs > 0 {
    42			nativeEndian.PutUint32(b[12:16], uint32(attrs))
    43		}
    44		return b, nil
    45	}
    46	
    47	func (w *wireFormat) parseRouteMessage(typ RIBType, b []byte) (Message, error) {
    48		if len(b) < w.bodyOff {
    49			return nil, errMessageTooShort
    50		}
    51		l := int(nativeEndian.Uint16(b[:2]))
    52		if len(b) < l {
    53			return nil, errInvalidMessage
    54		}
    55		m := &RouteMessage{
    56			Version: int(b[2]),
    57			Type:    int(b[3]),
    58			Flags:   int(nativeEndian.Uint32(b[8:12])),
    59			Index:   int(nativeEndian.Uint16(b[4:6])),
    60			ID:      uintptr(nativeEndian.Uint32(b[16:20])),
    61			Seq:     int(nativeEndian.Uint32(b[20:24])),
    62			extOff:  w.extOff,
    63			raw:     b[:l],
    64		}
    65		errno := syscall.Errno(nativeEndian.Uint32(b[28:32]))
    66		if errno != 0 {
    67			m.Err = errno
    68		}
    69		var err error
    70		m.Addrs, err = parseAddrs(uint(nativeEndian.Uint32(b[12:16])), parseKernelInetAddr, b[w.bodyOff:])
    71		if err != nil {
    72			return nil, err
    73		}
    74		return m, nil
    75	}
    76	

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