github.com/hxx258456/ccgo@v0.0.5-0.20230213014102-48b35f46f66f/net/ipv4/control_bsd.go (about)

     1  // Copyright 2012 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 aix || darwin || dragonfly || freebsd || netbsd || openbsd
     6  // +build aix darwin dragonfly freebsd netbsd openbsd
     7  
     8  package ipv4
     9  
    10  import (
    11  	"net"
    12  	"syscall"
    13  	"unsafe"
    14  
    15  	"github.com/hxx258456/ccgo/net/internal/iana"
    16  	"github.com/hxx258456/ccgo/net/internal/socket"
    17  
    18  	"golang.org/x/sys/unix"
    19  )
    20  
    21  func marshalDst(b []byte, cm *ControlMessage) []byte {
    22  	m := socket.ControlMessage(b)
    23  	m.MarshalHeader(iana.ProtocolIP, unix.IP_RECVDSTADDR, net.IPv4len)
    24  	return m.Next(net.IPv4len)
    25  }
    26  
    27  func parseDst(cm *ControlMessage, b []byte) {
    28  	if len(cm.Dst) < net.IPv4len {
    29  		cm.Dst = make(net.IP, net.IPv4len)
    30  	}
    31  	copy(cm.Dst, b[:net.IPv4len])
    32  }
    33  
    34  func marshalInterface(b []byte, cm *ControlMessage) []byte {
    35  	m := socket.ControlMessage(b)
    36  	m.MarshalHeader(iana.ProtocolIP, sockoptReceiveInterface, syscall.SizeofSockaddrDatalink)
    37  	return m.Next(syscall.SizeofSockaddrDatalink)
    38  }
    39  
    40  func parseInterface(cm *ControlMessage, b []byte) {
    41  	var sadl syscall.SockaddrDatalink
    42  	copy((*[unsafe.Sizeof(sadl)]byte)(unsafe.Pointer(&sadl))[:], b)
    43  	cm.IfIndex = int(sadl.Index)
    44  }