本文整理汇总了Golang中syscall.CmsgSpace函数的典型用法代码示例。如果您正苦于以下问题:Golang CmsgSpace函数的具体用法?Golang CmsgSpace怎么用?Golang CmsgSpace使用的例子?那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。
在下文中一共展示了CmsgSpace函数的15个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的Golang代码示例。
示例1: marshalControlMessage
func marshalControlMessage(cm *ControlMessage) (oob []byte) {
if cm == nil {
return
}
l, off := 0, 0
pion := false
if cm.Src.To4() != nil || cm.IfIndex != 0 {
pion = true
l += syscall.CmsgSpace(syscall.SizeofInet4Pktinfo)
}
if l > 0 {
oob = make([]byte, l)
if pion {
m := (*syscall.Cmsghdr)(unsafe.Pointer(&oob[off]))
m.Level = ianaProtocolIP
m.Type = syscall.IP_PKTINFO
m.SetLen(syscall.CmsgLen(syscall.SizeofInet4Pktinfo))
pi := (*syscall.Inet4Pktinfo)(unsafe.Pointer(&oob[off+syscall.CmsgLen(0)]))
if ip := cm.Src.To4(); ip != nil {
copy(pi.Addr[:], ip)
}
if cm.IfIndex != 0 {
pi.Ifindex = int32(cm.IfIndex)
}
off += syscall.CmsgSpace(syscall.SizeofInet4Pktinfo)
}
}
return
}
示例2: newControlMessage
func newControlMessage(opt *rawOpt) (oob []byte) {
opt.Lock()
defer opt.Unlock()
l, off := 0, 0
if opt.isset(FlagHopLimit) {
l += syscall.CmsgSpace(4)
}
if opt.isset(pktinfo) {
l += syscall.CmsgSpace(sysSizeofPacketInfo)
}
if l > 0 {
oob = make([]byte, l)
if opt.isset(FlagHopLimit) {
m := (*syscall.Cmsghdr)(unsafe.Pointer(&oob[off]))
m.Level = ianaProtocolIPv6
m.Type = sysSockopt2292HopLimit
m.SetLen(syscall.CmsgLen(4))
off += syscall.CmsgSpace(4)
}
if opt.isset(pktinfo) {
m := (*syscall.Cmsghdr)(unsafe.Pointer(&oob[off]))
m.Level = ianaProtocolIPv6
m.Type = sysSockopt2292PacketInfo
m.SetLen(syscall.CmsgLen(sysSizeofPacketInfo))
off += syscall.CmsgSpace(sysSizeofPacketInfo)
}
}
return
}
示例3: newControlMessage
func newControlMessage(opt *rawOpt) (oob []byte) {
opt.Lock()
defer opt.Unlock()
l, off := 0, 0
if opt.isset(FlagTTL) {
l += syscall.CmsgSpace(1)
}
if opt.isset(pktinfo) {
l += syscall.CmsgSpace(syscall.SizeofInet4Pktinfo)
}
if l > 0 {
oob = make([]byte, l)
if opt.isset(FlagTTL) {
m := (*syscall.Cmsghdr)(unsafe.Pointer(&oob[off]))
m.Level = ianaProtocolIP
m.Type = syscall.IP_RECVTTL
m.SetLen(syscall.CmsgLen(1))
off += syscall.CmsgSpace(1)
}
if opt.isset(pktinfo) {
m := (*syscall.Cmsghdr)(unsafe.Pointer(&oob[off]))
m.Level = ianaProtocolIP
m.Type = syscall.IP_PKTINFO
m.SetLen(syscall.CmsgLen(syscall.SizeofInet4Pktinfo))
off += syscall.CmsgSpace(syscall.SizeofInet4Pktinfo)
}
}
return
}
示例4: newControlMessage
func newControlMessage(opt *rawOpt) (oob []byte) {
opt.RLock()
var l int
if opt.isset(FlagTrafficClass) && ctlOpts[ctlTrafficClass].name > 0 {
l += syscall.CmsgSpace(ctlOpts[ctlTrafficClass].length)
}
if opt.isset(FlagHopLimit) && ctlOpts[ctlHopLimit].name > 0 {
l += syscall.CmsgSpace(ctlOpts[ctlHopLimit].length)
}
if opt.isset(flagPacketInfo) && ctlOpts[ctlPacketInfo].name > 0 {
l += syscall.CmsgSpace(ctlOpts[ctlPacketInfo].length)
}
if opt.isset(FlagPathMTU) && ctlOpts[ctlPathMTU].name > 0 {
l += syscall.CmsgSpace(ctlOpts[ctlPathMTU].length)
}
if l > 0 {
oob = make([]byte, l)
b := oob
if opt.isset(FlagTrafficClass) && ctlOpts[ctlTrafficClass].name > 0 {
b = ctlOpts[ctlTrafficClass].marshal(b, nil)
}
if opt.isset(FlagHopLimit) && ctlOpts[ctlHopLimit].name > 0 {
b = ctlOpts[ctlHopLimit].marshal(b, nil)
}
if opt.isset(flagPacketInfo) && ctlOpts[ctlPacketInfo].name > 0 {
b = ctlOpts[ctlPacketInfo].marshal(b, nil)
}
if opt.isset(FlagPathMTU) && ctlOpts[ctlPathMTU].name > 0 {
b = ctlOpts[ctlPathMTU].marshal(b, nil)
}
}
opt.RUnlock()
return
}
示例5: newControlMessage
func newControlMessage(opt *rawOpt) (oob []byte) {
opt.lock()
defer opt.unlock()
if opt.isset(FlagTTL) {
b := make([]byte, syscall.CmsgSpace(1))
cmsg := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
cmsg.Level = ianaProtocolIP
cmsg.Type = syscall.IP_RECVTTL
cmsg.SetLen(syscall.CmsgLen(1))
oob = append(oob, b...)
}
if opt.isset(FlagDst) {
b := make([]byte, syscall.CmsgSpace(net.IPv4len))
cmsg := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
cmsg.Level = ianaProtocolIP
cmsg.Type = syscall.IP_RECVDSTADDR
cmsg.SetLen(syscall.CmsgLen(net.IPv4len))
oob = append(oob, b...)
}
if opt.isset(FlagInterface) {
b := make([]byte, syscall.CmsgSpace(syscall.SizeofSockaddrDatalink))
cmsg := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
cmsg.Level = ianaProtocolIP
cmsg.Type = syscall.IP_RECVIF
cmsg.SetLen(syscall.CmsgLen(syscall.SizeofSockaddrDatalink))
oob = append(oob, b...)
}
return
}
示例6: oobLen
func (opt *rawOpt) oobLen() (l int) {
if opt.isset(FlagTTL) {
l += syscall.CmsgSpace(1)
}
if opt.isset(FlagSrc | FlagDst | FlagInterface) {
l += syscall.CmsgSpace(sysSizeofPacketInfo)
}
return
}
示例7: marshalTTL
func marshalTTL(b []byte, cm *ControlMessage) []byte {
m := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
m.Level = iana.ProtocolIP
m.Type = sysIP_RECVTTL
m.SetLen(syscall.CmsgLen(1))
return b[syscall.CmsgSpace(1):]
}
示例8: marshalDst
func marshalDst(b []byte, cm *ControlMessage) []byte {
m := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
m.Level = iana.ProtocolIP
m.Type = sysIP_RECVDSTADDR
m.SetLen(syscall.CmsgLen(net.IPv4len))
return b[syscall.CmsgSpace(net.IPv4len):]
}
示例9: marshalInterface
func marshalInterface(b []byte, cm *ControlMessage) []byte {
m := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
m.Level = iana.ProtocolIP
m.Type = sysIP_RECVIF
m.SetLen(syscall.CmsgLen(syscall.SizeofSockaddrDatalink))
return b[syscall.CmsgSpace(syscall.SizeofSockaddrDatalink):]
}
示例10: marshalControlMessage
func marshalControlMessage(cm *ControlMessage) (oob []byte) {
if cm == nil {
return
}
pi := &syscall.Inet4Pktinfo{}
pion := false
if ip := cm.Src.To4(); ip != nil {
copy(pi.Spec_dst[:], ip[:net.IPv4len])
pion = true
}
if cm.IfIndex != 0 {
pi.Ifindex = int32(cm.IfIndex)
pion = true
}
if pion {
b := make([]byte, syscall.CmsgSpace(syscall.SizeofInet4Pktinfo))
cmsg := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
cmsg.Level = ianaProtocolIP
cmsg.Type = syscall.IP_PKTINFO
cmsg.SetLen(syscall.CmsgLen(syscall.SizeofInet4Pktinfo))
data := b[syscall.CmsgLen(0):]
copy(data[:syscall.SizeofInet4Pktinfo], (*[syscall.SizeofInet4Pktinfo]byte)(unsafe.Pointer(pi))[:syscall.SizeofInet4Pktinfo])
oob = append(oob, b...)
}
return
}
示例11: marshalPathMTU
func marshalPathMTU(b []byte, cm *ControlMessage) []byte {
m := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
m.Level = iana.ProtocolIPv6
m.Type = sysIPV6_PATHMTU
m.SetLen(syscall.CmsgLen(sysSizeofIPv6Mtuinfo))
return b[syscall.CmsgSpace(sysSizeofIPv6Mtuinfo):]
}
示例12: UnixCredentials
// http://golang.org/src/pkg/syscall/sockcmsg_linux.go
// UnixCredentials encodes credentials into a socket control message
// for sending to another process. This can be used for
// authentication.
func UnixCredentials(ucred *Ucred) []byte {
b := make([]byte, syscall.CmsgSpace(SizeofUcred))
h := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
h.Level = syscall.SOL_SOCKET
h.Type = syscall.SCM_CREDS
h.SetLen(syscall.CmsgLen(SizeofUcred))
*((*Ucred)(cmsgData(h))) = *ucred
return b
}
示例13: oobLen
func (opt *rawOpt) oobLen() (l int) {
if opt.isset(FlagTTL) {
l += syscall.CmsgSpace(1)
}
if supportsPacketInfo {
if opt.isset(FlagSrc | FlagDst | FlagInterface) {
l += syscall.CmsgSpace(sysSizeofPacketInfo)
}
} else {
if opt.isset(FlagDst) {
l += syscall.CmsgSpace(net.IPv4len)
}
if opt.isset(FlagInterface) {
l += syscall.CmsgSpace(syscall.SizeofSockaddrDatalink)
}
}
return
}
示例14: marshalControlMessage
func (opt *rawOpt) marshalControlMessage() (oob []byte) {
var off int
oob = make([]byte, opt.oobLen())
if opt.isset(FlagTTL) {
m := (*syscall.Cmsghdr)(unsafe.Pointer(&oob[off]))
m.Level = ianaProtocolIP
m.Type = sysSockoptReceiveTTL
m.SetLen(syscall.CmsgLen(1))
off += syscall.CmsgSpace(1)
}
if opt.isset(FlagSrc | FlagDst | FlagInterface) {
m := (*syscall.Cmsghdr)(unsafe.Pointer(&oob[0]))
m.Level = ianaProtocolIP
m.Type = sysSockoptPacketInfo
m.SetLen(syscall.CmsgLen(sysSizeofPacketInfo))
off += syscall.CmsgSpace(sysSizeofPacketInfo)
}
return
}
示例15: marshalControlMessage
func marshalControlMessage(cm *ControlMessage) (oob []byte) {
if cm == nil {
return
}
var l int
tclass := false
if ctlOpts[ctlTrafficClass].name > 0 && cm.TrafficClass > 0 {
tclass = true
l += syscall.CmsgSpace(ctlOpts[ctlTrafficClass].length)
}
hoplimit := false
if ctlOpts[ctlHopLimit].name > 0 && cm.HopLimit > 0 {
hoplimit = true
l += syscall.CmsgSpace(ctlOpts[ctlHopLimit].length)
}
pktinfo := false
if ctlOpts[ctlPacketInfo].name > 0 && (cm.Src.To16() != nil && cm.Src.To4() == nil || cm.IfIndex > 0) {
pktinfo = true
l += syscall.CmsgSpace(ctlOpts[ctlPacketInfo].length)
}
nexthop := false
if ctlOpts[ctlNextHop].name > 0 && cm.NextHop.To16() != nil && cm.NextHop.To4() == nil {
nexthop = true
l += syscall.CmsgSpace(ctlOpts[ctlNextHop].length)
}
if l > 0 {
oob = make([]byte, l)
b := oob
if tclass {
b = ctlOpts[ctlTrafficClass].marshal(b, cm)
}
if hoplimit {
b = ctlOpts[ctlHopLimit].marshal(b, cm)
}
if pktinfo {
b = ctlOpts[ctlPacketInfo].marshal(b, cm)
}
if nexthop {
b = ctlOpts[ctlNextHop].marshal(b, cm)
}
}
return
}