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Source file src/net/interface_freebsd.go

Documentation: net

     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 net
     6  
     7  import (
     8  	"syscall"
     9  
    10  	"golang_org/x/net/route"
    11  )
    12  
    13  func interfaceMessages(ifindex int) ([]route.Message, error) {
    14  	typ := route.RIBType(syscall.NET_RT_IFLISTL)
    15  	rib, err := route.FetchRIB(syscall.AF_UNSPEC, typ, ifindex)
    16  	if err != nil {
    17  		typ = route.RIBType(syscall.NET_RT_IFLIST)
    18  		rib, err = route.FetchRIB(syscall.AF_UNSPEC, typ, ifindex)
    19  	}
    20  	if err != nil {
    21  		return nil, err
    22  	}
    23  	return route.ParseRIB(typ, rib)
    24  }
    25  
    26  // interfaceMulticastAddrTable returns addresses for a specific
    27  // interface.
    28  func interfaceMulticastAddrTable(ifi *Interface) ([]Addr, error) {
    29  	rib, err := route.FetchRIB(syscall.AF_UNSPEC, syscall.NET_RT_IFMALIST, ifi.Index)
    30  	if err != nil {
    31  		return nil, err
    32  	}
    33  	msgs, err := route.ParseRIB(syscall.NET_RT_IFMALIST, rib)
    34  	if err != nil {
    35  		return nil, err
    36  	}
    37  	ifmat := make([]Addr, 0, len(msgs))
    38  	for _, m := range msgs {
    39  		switch m := m.(type) {
    40  		case *route.InterfaceMulticastAddrMessage:
    41  			if ifi.Index != m.Index {
    42  				continue
    43  			}
    44  			var ip IP
    45  			switch sa := m.Addrs[syscall.RTAX_IFA].(type) {
    46  			case *route.Inet4Addr:
    47  				ip = IPv4(sa.IP[0], sa.IP[1], sa.IP[2], sa.IP[3])
    48  			case *route.Inet6Addr:
    49  				ip = make(IP, IPv6len)
    50  				copy(ip, sa.IP[:])
    51  			}
    52  			if ip != nil {
    53  				ifmat = append(ifmat, &IPAddr{IP: ip})
    54  			}
    55  		}
    56  	}
    57  	return ifmat, nil
    58  }
    59  

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