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