github.com/hxx258456/ccgo@v0.0.5-0.20230213014102-48b35f46f66f/net/route/interface_freebsd.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  package route
     6  
     7  func (w *wireFormat) parseInterfaceMessage(typ RIBType, b []byte) (Message, error) {
     8  	var extOff, bodyOff int
     9  	if typ == sysNET_RT_IFLISTL {
    10  		if len(b) < 20 {
    11  			return nil, errMessageTooShort
    12  		}
    13  		extOff = int(nativeEndian.Uint16(b[18:20]))
    14  		bodyOff = int(nativeEndian.Uint16(b[16:18]))
    15  	} else {
    16  		extOff = w.extOff
    17  		bodyOff = w.bodyOff
    18  	}
    19  	if len(b) < extOff || len(b) < bodyOff {
    20  		return nil, errInvalidMessage
    21  	}
    22  	l := int(nativeEndian.Uint16(b[:2]))
    23  	if len(b) < l {
    24  		return nil, errInvalidMessage
    25  	}
    26  	attrs := uint(nativeEndian.Uint32(b[4:8]))
    27  	if attrs&sysRTA_IFP == 0 {
    28  		return nil, nil
    29  	}
    30  	m := &InterfaceMessage{
    31  		Version: int(b[2]),
    32  		Type:    int(b[3]),
    33  		Flags:   int(nativeEndian.Uint32(b[8:12])),
    34  		Index:   int(nativeEndian.Uint16(b[12:14])),
    35  		Addrs:   make([]Addr, sysRTAX_MAX),
    36  		extOff:  extOff,
    37  		raw:     b[:l],
    38  	}
    39  	a, err := parseLinkAddr(b[bodyOff:])
    40  	if err != nil {
    41  		return nil, err
    42  	}
    43  	m.Addrs[sysRTAX_IFP] = a
    44  	m.Name = a.(*LinkAddr).Name
    45  	return m, nil
    46  }
    47  
    48  func (w *wireFormat) parseInterfaceAddrMessage(typ RIBType, b []byte) (Message, error) {
    49  	var bodyOff int
    50  	if typ == sysNET_RT_IFLISTL {
    51  		if len(b) < 24 {
    52  			return nil, errMessageTooShort
    53  		}
    54  		bodyOff = int(nativeEndian.Uint16(b[16:18]))
    55  	} else {
    56  		bodyOff = w.bodyOff
    57  	}
    58  	if len(b) < bodyOff {
    59  		return nil, errInvalidMessage
    60  	}
    61  	l := int(nativeEndian.Uint16(b[:2]))
    62  	if len(b) < l {
    63  		return nil, errInvalidMessage
    64  	}
    65  	m := &InterfaceAddrMessage{
    66  		Version: int(b[2]),
    67  		Type:    int(b[3]),
    68  		Flags:   int(nativeEndian.Uint32(b[8:12])),
    69  		Index:   int(nativeEndian.Uint16(b[12:14])),
    70  		raw:     b[:l],
    71  	}
    72  	var err error
    73  	m.Addrs, err = parseAddrs(uint(nativeEndian.Uint32(b[4:8])), parseKernelInetAddr, b[bodyOff:])
    74  	if err != nil {
    75  		return nil, err
    76  	}
    77  	return m, nil
    78  }