github.com/q45/go@v0.0.0-20151101211701-a4fb8c13db3f/src/syscall/route_darwin.go (about)

     1  // Copyright 2011 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 syscall
     6  
     7  import "unsafe"
     8  
     9  func (any *anyMessage) toRoutingMessage(b []byte) RoutingMessage {
    10  	switch any.Type {
    11  	case RTM_ADD, RTM_DELETE, RTM_CHANGE, RTM_GET, RTM_LOSING, RTM_REDIRECT, RTM_MISS, RTM_LOCK, RTM_RESOLVE:
    12  		p := (*RouteMessage)(unsafe.Pointer(any))
    13  		return &RouteMessage{Header: p.Header, Data: b[SizeofRtMsghdr:any.Msglen]}
    14  	case RTM_IFINFO:
    15  		p := (*InterfaceMessage)(unsafe.Pointer(any))
    16  		return &InterfaceMessage{Header: p.Header, Data: b[SizeofIfMsghdr:any.Msglen]}
    17  	case RTM_NEWADDR, RTM_DELADDR:
    18  		p := (*InterfaceAddrMessage)(unsafe.Pointer(any))
    19  		return &InterfaceAddrMessage{Header: p.Header, Data: b[SizeofIfaMsghdr:any.Msglen]}
    20  	case RTM_NEWMADDR2, RTM_DELMADDR:
    21  		p := (*InterfaceMulticastAddrMessage)(unsafe.Pointer(any))
    22  		return &InterfaceMulticastAddrMessage{Header: p.Header, Data: b[SizeofIfmaMsghdr2:any.Msglen]}
    23  	}
    24  	return nil
    25  }
    26  
    27  // InterfaceMulticastAddrMessage represents a routing message
    28  // containing network interface address entries.
    29  type InterfaceMulticastAddrMessage struct {
    30  	Header IfmaMsghdr2
    31  	Data   []byte
    32  }
    33  
    34  func (m *InterfaceMulticastAddrMessage) sockaddr() ([]Sockaddr, error) {
    35  	var sas [RTAX_MAX]Sockaddr
    36  	b := m.Data[:]
    37  	for i := uint(0); i < RTAX_MAX && len(b) >= minRoutingSockaddrLen; i++ {
    38  		if m.Header.Addrs&(1<<i) == 0 {
    39  			continue
    40  		}
    41  		rsa := (*RawSockaddr)(unsafe.Pointer(&b[0]))
    42  		switch rsa.Family {
    43  		case AF_LINK:
    44  			sa, err := parseSockaddrLink(b)
    45  			if err != nil {
    46  				return nil, err
    47  			}
    48  			sas[i] = sa
    49  			b = b[rsaAlignOf(int(rsa.Len)):]
    50  		case AF_INET, AF_INET6:
    51  			sa, err := parseSockaddrInet(b, rsa.Family)
    52  			if err != nil {
    53  				return nil, err
    54  			}
    55  			sas[i] = sa
    56  			b = b[rsaAlignOf(int(rsa.Len)):]
    57  		default:
    58  			sa, l, err := parseLinkLayerAddr(b)
    59  			if err != nil {
    60  				return nil, err
    61  			}
    62  			sas[i] = sa
    63  			b = b[l:]
    64  		}
    65  	}
    66  	return sas[:], nil
    67  }