udpcmsg

Documentation

Index

• func CmsgPktInfo(b []byte, addr netip.Addr) []byte
• func CmsgSize(addr netip.Addr) int
• func Ok() bool
• func ParseLocalAddr(oob []byte) (netip.Addr, error)
• func SetOpt(c *net.UDPConn) (inet6 bool, err error)

Functions

func CmsgPktInfo

func CmsgPktInfo(b []byte, addr netip.Addr) []byte

Pack addr into a control msg (Inet[4|6]Pktinfo). b is the buffer for packing, if b is not big enough (or nil), a new slice will be allocated. Invalid addr returns nil.

func CmsgSize

func CmsgSize(addr netip.Addr) int

Cmsg size for addr. If addr is invalid, returns 0.

func Ok

func Ok() bool

func ParseLocalAddr

func ParseLocalAddr(oob []byte) (netip.Addr, error)

Parses local addr from oob control msgs. May return invalid addr and nil error if no local addr info was found.

func SetOpt

func SetOpt(c *net.UDPConn) (inet6 bool, err error)

Set socket option to receive local addr in oob. Inet6 is true if c is an inet6 connection and IPV6_RECVPKTINFO was set. otherwise, c is an inet4 connection and IP_PKTINFO was set.