golang.org/toolchain@v0.0.1-go1.9rc2.windows-amd64/src/vendor/golang_org/x/net/route/route_classic.go (about)

     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 "syscall"
    10  
    11  func (m *RouteMessage) marshal() ([]byte, error) {
    12  	w, ok := wireFormats[m.Type]
    13  	if !ok {
    14  		return nil, errUnsupportedMessage
    15  	}
    16  	l := w.bodyOff + addrsSpace(m.Addrs)
    17  	b := make([]byte, l)
    18  	nativeEndian.PutUint16(b[:2], uint16(l))
    19  	if m.Version == 0 {
    20  		b[2] = sysRTM_VERSION
    21  	} else {
    22  		b[2] = byte(m.Version)
    23  	}
    24  	b[3] = byte(m.Type)
    25  	nativeEndian.PutUint32(b[8:12], uint32(m.Flags))
    26  	nativeEndian.PutUint16(b[4:6], uint16(m.Index))
    27  	nativeEndian.PutUint32(b[16:20], uint32(m.ID))
    28  	nativeEndian.PutUint32(b[20:24], uint32(m.Seq))
    29  	attrs, err := marshalAddrs(b[w.bodyOff:], m.Addrs)
    30  	if err != nil {
    31  		return nil, err
    32  	}
    33  	if attrs > 0 {
    34  		nativeEndian.PutUint32(b[12:16], uint32(attrs))
    35  	}
    36  	return b, nil
    37  }
    38  
    39  func (w *wireFormat) parseRouteMessage(typ RIBType, b []byte) (Message, error) {
    40  	if len(b) < w.bodyOff {
    41  		return nil, errMessageTooShort
    42  	}
    43  	l := int(nativeEndian.Uint16(b[:2]))
    44  	if len(b) < l {
    45  		return nil, errInvalidMessage
    46  	}
    47  	m := &RouteMessage{
    48  		Version: int(b[2]),
    49  		Type:    int(b[3]),
    50  		Flags:   int(nativeEndian.Uint32(b[8:12])),
    51  		Index:   int(nativeEndian.Uint16(b[4:6])),
    52  		ID:      uintptr(nativeEndian.Uint32(b[16:20])),
    53  		Seq:     int(nativeEndian.Uint32(b[20:24])),
    54  		extOff:  w.extOff,
    55  		raw:     b[:l],
    56  	}
    57  	errno := syscall.Errno(nativeEndian.Uint32(b[28:32]))
    58  	if errno != 0 {
    59  		m.Err = errno
    60  	}
    61  	var err error
    62  	m.Addrs, err = parseAddrs(uint(nativeEndian.Uint32(b[12:16])), parseKernelInetAddr, b[w.bodyOff:])
    63  	if err != nil {
    64  		return nil, err
    65  	}
    66  	return m, nil
    67  }