github.com/graybobo/golang.org-package-offline-cache@v0.0.0-20200626051047-6608995c132f/x/net/ipv4/sys_darwin.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 package ipv4 6 7 import ( 8 "net" 9 "syscall" 10 "unsafe" 11 ) 12 13 type sysSockoptLen int32 14 15 var ( 16 ctlOpts = [ctlMax]ctlOpt{ 17 ctlTTL: {sysIP_RECVTTL, 1, marshalTTL, parseTTL}, 18 ctlDst: {sysIP_RECVDSTADDR, net.IPv4len, marshalDst, parseDst}, 19 ctlInterface: {sysIP_RECVIF, syscall.SizeofSockaddrDatalink, marshalInterface, parseInterface}, 20 } 21 22 sockOpts = [ssoMax]sockOpt{ 23 ssoTOS: {sysIP_TOS, ssoTypeInt}, 24 ssoTTL: {sysIP_TTL, ssoTypeInt}, 25 ssoMulticastTTL: {sysIP_MULTICAST_TTL, ssoTypeByte}, 26 ssoMulticastInterface: {sysIP_MULTICAST_IF, ssoTypeInterface}, 27 ssoMulticastLoopback: {sysIP_MULTICAST_LOOP, ssoTypeInt}, 28 ssoReceiveTTL: {sysIP_RECVTTL, ssoTypeInt}, 29 ssoReceiveDst: {sysIP_RECVDSTADDR, ssoTypeInt}, 30 ssoReceiveInterface: {sysIP_RECVIF, ssoTypeInt}, 31 ssoHeaderPrepend: {sysIP_HDRINCL, ssoTypeInt}, 32 ssoStripHeader: {sysIP_STRIPHDR, ssoTypeInt}, 33 ssoJoinGroup: {sysIP_ADD_MEMBERSHIP, ssoTypeIPMreq}, 34 ssoLeaveGroup: {sysIP_DROP_MEMBERSHIP, ssoTypeIPMreq}, 35 } 36 ) 37 38 func init() { 39 // Seems like kern.osreldate is veiled on latest OS X. We use 40 // kern.osrelease instead. 41 osver, err := syscall.Sysctl("kern.osrelease") 42 if err != nil { 43 return 44 } 45 var i int 46 for i = range osver { 47 if osver[i] == '.' { 48 break 49 } 50 } 51 // The IP_PKTINFO and protocol-independent multicast API were 52 // introduced in OS X 10.7 (Darwin 11.0.0). But it looks like 53 // those features require OS X 10.8 (Darwin 12.0.0) and above. 54 // See http://support.apple.com/kb/HT1633. 55 if i > 2 || i == 2 && osver[0] >= '1' && osver[1] >= '2' { 56 ctlOpts[ctlPacketInfo].name = sysIP_PKTINFO 57 ctlOpts[ctlPacketInfo].length = sysSizeofInetPktinfo 58 ctlOpts[ctlPacketInfo].marshal = marshalPacketInfo 59 ctlOpts[ctlPacketInfo].parse = parsePacketInfo 60 sockOpts[ssoPacketInfo].name = sysIP_RECVPKTINFO 61 sockOpts[ssoPacketInfo].typ = ssoTypeInt 62 sockOpts[ssoMulticastInterface].typ = ssoTypeIPMreqn 63 sockOpts[ssoJoinGroup].name = sysMCAST_JOIN_GROUP 64 sockOpts[ssoJoinGroup].typ = ssoTypeGroupReq 65 sockOpts[ssoLeaveGroup].name = sysMCAST_LEAVE_GROUP 66 sockOpts[ssoLeaveGroup].typ = ssoTypeGroupReq 67 sockOpts[ssoJoinSourceGroup].name = sysMCAST_JOIN_SOURCE_GROUP 68 sockOpts[ssoJoinSourceGroup].typ = ssoTypeGroupSourceReq 69 sockOpts[ssoLeaveSourceGroup].name = sysMCAST_LEAVE_SOURCE_GROUP 70 sockOpts[ssoLeaveSourceGroup].typ = ssoTypeGroupSourceReq 71 sockOpts[ssoBlockSourceGroup].name = sysMCAST_BLOCK_SOURCE 72 sockOpts[ssoBlockSourceGroup].typ = ssoTypeGroupSourceReq 73 sockOpts[ssoUnblockSourceGroup].name = sysMCAST_UNBLOCK_SOURCE 74 sockOpts[ssoUnblockSourceGroup].typ = ssoTypeGroupSourceReq 75 } 76 } 77 78 func (pi *sysInetPktinfo) setIfindex(i int) { 79 pi.Ifindex = uint32(i) 80 } 81 82 func (gr *sysGroupReq) setGroup(grp net.IP) { 83 sa := (*sysSockaddrInet)(unsafe.Pointer(&gr.Pad_cgo_0[0])) 84 sa.Len = sysSizeofSockaddrInet 85 sa.Family = syscall.AF_INET 86 copy(sa.Addr[:], grp) 87 } 88 89 func (gsr *sysGroupSourceReq) setSourceGroup(grp, src net.IP) { 90 sa := (*sysSockaddrInet)(unsafe.Pointer(&gsr.Pad_cgo_0[0])) 91 sa.Len = sysSizeofSockaddrInet 92 sa.Family = syscall.AF_INET 93 copy(sa.Addr[:], grp) 94 sa = (*sysSockaddrInet)(unsafe.Pointer(&gsr.Pad_cgo_1[0])) 95 sa.Len = sysSizeofSockaddrInet 96 sa.Family = syscall.AF_INET 97 copy(sa.Addr[:], src) 98 }