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

     1  // Copyright 2014 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 || freebsd || linux || solaris
     6  // +build darwin freebsd linux solaris
     7  
     8  package ipv4
     9  
    10  import (
    11  	"net"
    12  	"unsafe"
    13  
    14  	"github.com/hxx258456/ccgo/net/internal/socket"
    15  )
    16  
    17  func (so *sockOpt) setGroupReq(c *socket.Conn, ifi *net.Interface, grp net.IP) error {
    18  	var gr groupReq
    19  	if ifi != nil {
    20  		gr.Interface = uint32(ifi.Index)
    21  	}
    22  	gr.setGroup(grp)
    23  	var b []byte
    24  	if compatFreeBSD32 {
    25  		var d [sizeofGroupReq + 4]byte
    26  		s := (*[sizeofGroupReq]byte)(unsafe.Pointer(&gr))
    27  		copy(d[:4], s[:4])
    28  		copy(d[8:], s[4:])
    29  		b = d[:]
    30  	} else {
    31  		b = (*[sizeofGroupReq]byte)(unsafe.Pointer(&gr))[:sizeofGroupReq]
    32  	}
    33  	return so.Set(c, b)
    34  }
    35  
    36  func (so *sockOpt) setGroupSourceReq(c *socket.Conn, ifi *net.Interface, grp, src net.IP) error {
    37  	var gsr groupSourceReq
    38  	if ifi != nil {
    39  		gsr.Interface = uint32(ifi.Index)
    40  	}
    41  	gsr.setSourceGroup(grp, src)
    42  	var b []byte
    43  	if compatFreeBSD32 {
    44  		var d [sizeofGroupSourceReq + 4]byte
    45  		s := (*[sizeofGroupSourceReq]byte)(unsafe.Pointer(&gsr))
    46  		copy(d[:4], s[:4])
    47  		copy(d[8:], s[4:])
    48  		b = d[:]
    49  	} else {
    50  		b = (*[sizeofGroupSourceReq]byte)(unsafe.Pointer(&gsr))[:sizeofGroupSourceReq]
    51  	}
    52  	return so.Set(c, b)
    53  }