route_openbsd.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  package route
     6  
     7  import (
     8  	"syscall"
     9  )
    10  
    11  func (m *RouteMessage) marshal() ([]byte, error) {
    12  	l := sizeofRtMsghdr + addrsSpace(m.Addrs)
    13  	b := make([]byte, l)
    14  	nativeEndian.PutUint16(b[:2], uint16(l))
    15  	if m.Version == 0 {
    16  		b[2] = syscall.RTM_VERSION
    17  	} else {
    18  		b[2] = byte(m.Version)
    19  	}
    20  	b[3] = byte(m.Type)
    21  	nativeEndian.PutUint16(b[4:6], uint16(sizeofRtMsghdr))
    22  	nativeEndian.PutUint32(b[16:20], uint32(m.Flags))
    23  	nativeEndian.PutUint16(b[6:8], uint16(m.Index))
    24  	nativeEndian.PutUint32(b[24:28], uint32(m.ID))
    25  	nativeEndian.PutUint32(b[28:32], uint32(m.Seq))
    26  	attrs, err := marshalAddrs(b[sizeofRtMsghdr:], m.Addrs)
    27  	if err != nil {
    28  		return nil, err
    29  	}
    30  	if attrs > 0 {
    31  		nativeEndian.PutUint32(b[12:16], uint32(attrs))
    32  	}
    33  	return b, nil
    34  }
    35  
    36  func (*wireFormat) parseRouteMessage(_ RIBType, b []byte) (Message, error) {
    37  	if len(b) < sizeofRtMsghdr {
    38  		return nil, errMessageTooShort
    39  	}
    40  	l := int(nativeEndian.Uint16(b[:2]))
    41  	if len(b) < l {
    42  		return nil, errInvalidMessage
    43  	}
    44  	m := &RouteMessage{
    45  		Version: int(b[2]),
    46  		Type:    int(b[3]),
    47  		Flags:   int(nativeEndian.Uint32(b[16:20])),
    48  		Index:   int(nativeEndian.Uint16(b[6:8])),
    49  		ID:      uintptr(nativeEndian.Uint32(b[24:28])),
    50  		Seq:     int(nativeEndian.Uint32(b[28:32])),
    51  		raw:     b[:l],
    52  	}
    53  	ll := int(nativeEndian.Uint16(b[4:6]))
    54  	if len(b) < ll {
    55  		return nil, errInvalidMessage
    56  	}
    57  	errno := syscall.Errno(nativeEndian.Uint32(b[32:36]))
    58  	if errno != 0 {
    59  		m.Err = errno
    60  	}
    61  	as, err := parseAddrs(uint(nativeEndian.Uint32(b[12:16])), parseKernelInetAddr, b[ll:])
    62  	if err != nil {
    63  		return nil, err
    64  	}
    65  	m.Addrs = as
    66  	return m, nil
    67  }
    68
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