98 lines
3.4 KiB
Go
98 lines
3.4 KiB
Go
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// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package ipv4
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import (
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"net"
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"strconv"
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"strings"
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"syscall"
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"unsafe"
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)
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var (
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ctlOpts = [ctlMax]ctlOpt{
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ctlTTL: {sysIP_RECVTTL, 1, marshalTTL, parseTTL},
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ctlDst: {sysIP_RECVDSTADDR, net.IPv4len, marshalDst, parseDst},
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ctlInterface: {sysIP_RECVIF, syscall.SizeofSockaddrDatalink, marshalInterface, parseInterface},
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}
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sockOpts = [ssoMax]sockOpt{
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ssoTOS: {sysIP_TOS, ssoTypeInt},
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ssoTTL: {sysIP_TTL, ssoTypeInt},
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ssoMulticastTTL: {sysIP_MULTICAST_TTL, ssoTypeByte},
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ssoMulticastInterface: {sysIP_MULTICAST_IF, ssoTypeInterface},
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ssoMulticastLoopback: {sysIP_MULTICAST_LOOP, ssoTypeInt},
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ssoReceiveTTL: {sysIP_RECVTTL, ssoTypeInt},
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ssoReceiveDst: {sysIP_RECVDSTADDR, ssoTypeInt},
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ssoReceiveInterface: {sysIP_RECVIF, ssoTypeInt},
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ssoHeaderPrepend: {sysIP_HDRINCL, ssoTypeInt},
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ssoStripHeader: {sysIP_STRIPHDR, ssoTypeInt},
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ssoJoinGroup: {sysIP_ADD_MEMBERSHIP, ssoTypeIPMreq},
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ssoLeaveGroup: {sysIP_DROP_MEMBERSHIP, ssoTypeIPMreq},
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}
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)
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func init() {
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// Seems like kern.osreldate is veiled on latest OS X. We use
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// kern.osrelease instead.
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s, err := syscall.Sysctl("kern.osrelease")
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if err != nil {
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return
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}
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ss := strings.Split(s, ".")
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if len(ss) == 0 {
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return
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}
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// The IP_PKTINFO and protocol-independent multicast API were
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// introduced in OS X 10.7 (Darwin 11). But it looks like
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// those features require OS X 10.8 (Darwin 12) or above.
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// See http://support.apple.com/kb/HT1633.
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if mjver, err := strconv.Atoi(ss[0]); err != nil || mjver < 12 {
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return
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}
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ctlOpts[ctlPacketInfo].name = sysIP_PKTINFO
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ctlOpts[ctlPacketInfo].length = sizeofInetPktinfo
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ctlOpts[ctlPacketInfo].marshal = marshalPacketInfo
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ctlOpts[ctlPacketInfo].parse = parsePacketInfo
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sockOpts[ssoPacketInfo].name = sysIP_RECVPKTINFO
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sockOpts[ssoPacketInfo].typ = ssoTypeInt
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sockOpts[ssoMulticastInterface].typ = ssoTypeIPMreqn
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sockOpts[ssoJoinGroup].name = sysMCAST_JOIN_GROUP
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sockOpts[ssoJoinGroup].typ = ssoTypeGroupReq
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sockOpts[ssoLeaveGroup].name = sysMCAST_LEAVE_GROUP
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sockOpts[ssoLeaveGroup].typ = ssoTypeGroupReq
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sockOpts[ssoJoinSourceGroup].name = sysMCAST_JOIN_SOURCE_GROUP
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sockOpts[ssoJoinSourceGroup].typ = ssoTypeGroupSourceReq
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sockOpts[ssoLeaveSourceGroup].name = sysMCAST_LEAVE_SOURCE_GROUP
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sockOpts[ssoLeaveSourceGroup].typ = ssoTypeGroupSourceReq
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sockOpts[ssoBlockSourceGroup].name = sysMCAST_BLOCK_SOURCE
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sockOpts[ssoBlockSourceGroup].typ = ssoTypeGroupSourceReq
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sockOpts[ssoUnblockSourceGroup].name = sysMCAST_UNBLOCK_SOURCE
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sockOpts[ssoUnblockSourceGroup].typ = ssoTypeGroupSourceReq
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}
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func (pi *inetPktinfo) setIfindex(i int) {
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pi.Ifindex = uint32(i)
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}
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func (gr *groupReq) setGroup(grp net.IP) {
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sa := (*sockaddrInet)(unsafe.Pointer(uintptr(unsafe.Pointer(gr)) + 4))
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sa.Len = sizeofSockaddrInet
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sa.Family = syscall.AF_INET
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copy(sa.Addr[:], grp)
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}
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func (gsr *groupSourceReq) setSourceGroup(grp, src net.IP) {
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sa := (*sockaddrInet)(unsafe.Pointer(uintptr(unsafe.Pointer(gsr)) + 4))
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sa.Len = sizeofSockaddrInet
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sa.Family = syscall.AF_INET
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copy(sa.Addr[:], grp)
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sa = (*sockaddrInet)(unsafe.Pointer(uintptr(unsafe.Pointer(gsr)) + 132))
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sa.Len = sizeofSockaddrInet
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sa.Family = syscall.AF_INET
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copy(sa.Addr[:], src)
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}
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