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net: deduplicate UDP socket code
This change consolidates functions and methods related to UDPAddr and UDPConn for maintenance purpose, especially for documentation. The followup changes will update comments and examples. Updates #10624. Change-Id: Idfe9be8ea46ade1111b0ae176862b2048eafc7be Reviewed-on: https://go-review.googlesource.com/20120 TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Mikio Hara
parent
1f96c83bf6
commit
20de705b71
@ -4,6 +4,8 @@
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package net
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import "syscall"
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// UDPAddr represents the address of a UDP end point.
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type UDPAddr struct {
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IP IP
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@ -59,3 +61,179 @@ func ResolveUDPAddr(net, addr string) (*UDPAddr, error) {
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}
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return addrs.first(isIPv4).(*UDPAddr), nil
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}
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// UDPConn is the implementation of the Conn and PacketConn interfaces
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// for UDP network connections.
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type UDPConn struct {
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conn
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}
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// ReadFromUDP reads a UDP packet from c, copying the payload into b.
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// It returns the number of bytes copied into b and the return address
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// that was on the packet.
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//
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// ReadFromUDP can be made to time out and return an error with
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// Timeout() == true after a fixed time limit; see SetDeadline and
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// SetReadDeadline.
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func (c *UDPConn) ReadFromUDP(b []byte) (int, *UDPAddr, error) {
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if !c.ok() {
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return 0, nil, syscall.EINVAL
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}
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n, addr, err := c.readFrom(b)
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if err != nil {
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err = &OpError{Op: "read", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
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}
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return n, addr, err
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}
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// ReadFrom implements the PacketConn ReadFrom method.
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func (c *UDPConn) ReadFrom(b []byte) (int, Addr, error) {
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if !c.ok() {
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return 0, nil, syscall.EINVAL
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}
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n, addr, err := c.readFrom(b)
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if err != nil {
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err = &OpError{Op: "read", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
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}
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if addr == nil {
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return n, nil, err
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}
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return n, addr, err
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}
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// ReadMsgUDP reads a packet from c, copying the payload into b and
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// the associated out-of-band data into oob. It returns the number
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// of bytes copied into b, the number of bytes copied into oob, the
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// flags that were set on the packet and the source address of the
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// packet.
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func (c *UDPConn) ReadMsgUDP(b, oob []byte) (n, oobn, flags int, addr *UDPAddr, err error) {
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if !c.ok() {
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return 0, 0, 0, nil, syscall.EINVAL
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}
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n, oobn, flags, addr, err = c.readMsg(b, oob)
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if err != nil {
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err = &OpError{Op: "read", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
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}
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return
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}
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// WriteToUDP writes a UDP packet to addr via c, copying the payload
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// from b.
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//
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// WriteToUDP can be made to time out and return an error with
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// Timeout() == true after a fixed time limit; see SetDeadline and
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// SetWriteDeadline. On packet-oriented connections, write timeouts
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// are rare.
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func (c *UDPConn) WriteToUDP(b []byte, addr *UDPAddr) (int, error) {
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if !c.ok() {
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return 0, syscall.EINVAL
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}
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n, err := c.writeTo(b, addr)
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if err != nil {
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err = &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addr.opAddr(), Err: err}
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}
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return n, err
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}
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// WriteTo implements the PacketConn WriteTo method.
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func (c *UDPConn) WriteTo(b []byte, addr Addr) (int, error) {
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if !c.ok() {
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return 0, syscall.EINVAL
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}
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a, ok := addr.(*UDPAddr)
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if !ok {
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return 0, &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addr, Err: syscall.EINVAL}
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}
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n, err := c.writeTo(b, a)
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if err != nil {
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err = &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: a.opAddr(), Err: err}
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}
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return n, err
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}
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// WriteMsgUDP writes a packet to addr via c if c isn't connected, or
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// to c's remote destination address if c is connected (in which case
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// addr must be nil). The payload is copied from b and the associated
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// out-of-band data is copied from oob. It returns the number of
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// payload and out-of-band bytes written.
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func (c *UDPConn) WriteMsgUDP(b, oob []byte, addr *UDPAddr) (n, oobn int, err error) {
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if !c.ok() {
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return 0, 0, syscall.EINVAL
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}
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n, oobn, err = c.writeMsg(b, oob, addr)
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if err != nil {
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err = &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addr.opAddr(), Err: err}
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}
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return
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}
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func newUDPConn(fd *netFD) *UDPConn { return &UDPConn{conn{fd}} }
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// DialUDP connects to the remote address raddr on the network net,
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// which must be "udp", "udp4", or "udp6". If laddr is not nil, it is
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// used as the local address for the connection.
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func DialUDP(net string, laddr, raddr *UDPAddr) (*UDPConn, error) {
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switch net {
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case "udp", "udp4", "udp6":
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default:
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return nil, &OpError{Op: "dial", Net: net, Source: laddr.opAddr(), Addr: raddr.opAddr(), Err: UnknownNetworkError(net)}
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}
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if raddr == nil {
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return nil, &OpError{Op: "dial", Net: net, Source: laddr.opAddr(), Addr: nil, Err: errMissingAddress}
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}
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c, err := dialUDP(net, laddr, raddr, noDeadline)
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if err != nil {
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return nil, &OpError{Op: "dial", Net: net, Source: laddr.opAddr(), Addr: raddr.opAddr(), Err: err}
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}
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return c, nil
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}
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// ListenUDP listens for incoming UDP packets addressed to the local
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// address laddr. Net must be "udp", "udp4", or "udp6". If laddr has
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// a port of 0, ListenUDP will choose an available port.
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// The LocalAddr method of the returned UDPConn can be used to
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// discover the port. The returned connection's ReadFrom and WriteTo
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// methods can be used to receive and send UDP packets with per-packet
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// addressing.
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func ListenUDP(net string, laddr *UDPAddr) (*UDPConn, error) {
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switch net {
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case "udp", "udp4", "udp6":
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default:
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return nil, &OpError{Op: "listen", Net: net, Source: nil, Addr: laddr.opAddr(), Err: UnknownNetworkError(net)}
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}
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if laddr == nil {
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laddr = &UDPAddr{}
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}
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c, err := listenUDP(net, laddr)
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if err != nil {
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return nil, &OpError{Op: "listen", Net: net, Source: nil, Addr: laddr.opAddr(), Err: err}
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}
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return c, nil
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}
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// ListenMulticastUDP listens for incoming multicast UDP packets
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// addressed to the group address gaddr on the interface ifi.
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// Network must be "udp", "udp4" or "udp6".
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// ListenMulticastUDP uses the system-assigned multicast interface
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// when ifi is nil, although this is not recommended because the
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// assignment depends on platforms and sometimes it might require
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// routing configuration.
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//
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// ListenMulticastUDP is just for convenience of simple, small
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// applications. There are golang.org/x/net/ipv4 and
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// golang.org/x/net/ipv6 packages for general purpose uses.
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func ListenMulticastUDP(network string, ifi *Interface, gaddr *UDPAddr) (*UDPConn, error) {
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switch network {
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case "udp", "udp4", "udp6":
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default:
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return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: gaddr.opAddr(), Err: UnknownNetworkError(network)}
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}
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if gaddr == nil || gaddr.IP == nil {
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return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: gaddr.opAddr(), Err: errMissingAddress}
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}
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c, err := listenMulticastUDP(network, ifi, gaddr)
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if err != nil {
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return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: gaddr.opAddr(), Err: err}
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}
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return c, nil
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}
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@ -11,32 +11,14 @@ import (
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"time"
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)
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// UDPConn is the implementation of the Conn and PacketConn interfaces
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// for UDP network connections.
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type UDPConn struct {
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conn
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}
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func newUDPConn(fd *netFD) *UDPConn { return &UDPConn{conn{fd}} }
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// ReadFromUDP reads a UDP packet from c, copying the payload into b.
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// It returns the number of bytes copied into b and the return address
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// that was on the packet.
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//
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// ReadFromUDP can be made to time out and return an error with
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// Timeout() == true after a fixed time limit; see SetDeadline and
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// SetReadDeadline.
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func (c *UDPConn) ReadFromUDP(b []byte) (n int, addr *UDPAddr, err error) {
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if !c.ok() || c.fd.data == nil {
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return 0, nil, syscall.EINVAL
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}
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func (c *UDPConn) readFrom(b []byte) (n int, addr *UDPAddr, err error) {
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buf := make([]byte, udpHeaderSize+len(b))
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m, err := c.fd.data.Read(buf)
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m, err := c.fd.Read(buf)
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if err != nil {
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return 0, nil, &OpError{Op: "read", Net: c.fd.dir, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
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return 0, nil, err
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}
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if m < udpHeaderSize {
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return 0, nil, &OpError{Op: "read", Net: c.fd.dir, Source: c.fd.laddr, Addr: c.fd.raddr, Err: errors.New("short read reading UDP header")}
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return 0, nil, errors.New("short read reading UDP header")
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}
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buf = buf[:m]
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@ -45,36 +27,13 @@ func (c *UDPConn) ReadFromUDP(b []byte) (n int, addr *UDPAddr, err error) {
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return n, &UDPAddr{IP: h.raddr, Port: int(h.rport)}, nil
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}
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// ReadFrom implements the PacketConn ReadFrom method.
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func (c *UDPConn) ReadFrom(b []byte) (int, Addr, error) {
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if !c.ok() {
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return 0, nil, syscall.EINVAL
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}
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return c.ReadFromUDP(b)
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func (c *UDPConn) readMsg(b, oob []byte) (n, oobn, flags int, addr *UDPAddr, err error) {
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return 0, 0, 0, nil, syscall.EPLAN9
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}
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// ReadMsgUDP reads a packet from c, copying the payload into b and
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// the associated out-of-band data into oob. It returns the number
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// of bytes copied into b, the number of bytes copied into oob, the
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// flags that were set on the packet and the source address of the
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// packet.
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func (c *UDPConn) ReadMsgUDP(b, oob []byte) (n, oobn, flags int, addr *UDPAddr, err error) {
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return 0, 0, 0, nil, &OpError{Op: "read", Net: c.fd.dir, Source: c.fd.laddr, Addr: c.fd.raddr, Err: syscall.EPLAN9}
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}
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// WriteToUDP writes a UDP packet to addr via c, copying the payload
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// from b.
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//
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// WriteToUDP can be made to time out and return an error with
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// Timeout() == true after a fixed time limit; see SetDeadline and
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// SetWriteDeadline. On packet-oriented connections, write timeouts
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// are rare.
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func (c *UDPConn) WriteToUDP(b []byte, addr *UDPAddr) (int, error) {
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if !c.ok() || c.fd.data == nil {
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return 0, syscall.EINVAL
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}
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func (c *UDPConn) writeTo(b []byte, addr *UDPAddr) (int, error) {
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if addr == nil {
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return 0, &OpError{Op: "write", Net: c.fd.dir, Source: c.fd.laddr, Addr: nil, Err: errMissingAddress}
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return 0, errMissingAddress
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}
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h := new(udpHeader)
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h.raddr = addr.IP.To16()
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@ -86,56 +45,20 @@ func (c *UDPConn) WriteToUDP(b []byte, addr *UDPAddr) (int, error) {
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buf := make([]byte, udpHeaderSize+len(b))
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i := copy(buf, h.Bytes())
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copy(buf[i:], b)
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if _, err := c.fd.data.Write(buf); err != nil {
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return 0, &OpError{Op: "write", Net: c.fd.dir, Source: c.fd.laddr, Addr: addr.opAddr(), Err: err}
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if _, err := c.fd.Write(buf); err != nil {
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return 0, err
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}
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return len(b), nil
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}
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// WriteTo implements the PacketConn WriteTo method.
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func (c *UDPConn) WriteTo(b []byte, addr Addr) (int, error) {
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if !c.ok() {
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return 0, syscall.EINVAL
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}
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a, ok := addr.(*UDPAddr)
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if !ok {
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return 0, &OpError{Op: "write", Net: c.fd.dir, Source: c.fd.laddr, Addr: addr, Err: syscall.EINVAL}
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}
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return c.WriteToUDP(b, a)
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}
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// WriteMsgUDP writes a packet to addr via c if c isn't connected, or
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// to c's remote destination address if c is connected (in which case
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// addr must be nil). The payload is copied from b and the associated
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// out-of-band data is copied from oob. It returns the number of
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// payload and out-of-band bytes written.
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func (c *UDPConn) WriteMsgUDP(b, oob []byte, addr *UDPAddr) (n, oobn int, err error) {
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return 0, 0, &OpError{Op: "write", Net: c.fd.dir, Source: c.fd.laddr, Addr: addr.opAddr(), Err: syscall.EPLAN9}
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}
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// DialUDP connects to the remote address raddr on the network net,
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// which must be "udp", "udp4", or "udp6". If laddr is not nil, it is
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// used as the local address for the connection.
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func DialUDP(net string, laddr, raddr *UDPAddr) (*UDPConn, error) {
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c, err := dialUDP(net, laddr, raddr, noDeadline)
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if err != nil {
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return nil, &OpError{Op: "dial", Net: net, Source: laddr.opAddr(), Addr: raddr.opAddr(), Err: err}
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}
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return c, nil
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func (c *UDPConn) writeMsg(b, oob []byte, addr *UDPAddr) (n, oobn int, err error) {
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return 0, 0, syscall.EPLAN9
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}
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func dialUDP(net string, laddr, raddr *UDPAddr, deadline time.Time) (*UDPConn, error) {
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if !deadline.IsZero() {
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panic("net.dialUDP: deadline not implemented on Plan 9")
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}
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switch net {
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case "udp", "udp4", "udp6":
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default:
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return nil, UnknownNetworkError(net)
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}
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if raddr == nil {
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return nil, errMissingAddress
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}
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fd, err := dialPlan9(net, laddr, raddr)
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if err != nil {
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return nil, err
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@ -171,49 +94,23 @@ func unmarshalUDPHeader(b []byte) (*udpHeader, []byte) {
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return h, b
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}
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// ListenUDP listens for incoming UDP packets addressed to the local
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// address laddr. Net must be "udp", "udp4", or "udp6". If laddr has
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// a port of 0, ListenUDP will choose an available port.
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// The LocalAddr method of the returned UDPConn can be used to
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// discover the port. The returned connection's ReadFrom and WriteTo
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// methods can be used to receive and send UDP packets with per-packet
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// addressing.
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func ListenUDP(net string, laddr *UDPAddr) (*UDPConn, error) {
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switch net {
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case "udp", "udp4", "udp6":
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default:
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return nil, &OpError{Op: "listen", Net: net, Source: nil, Addr: laddr.opAddr(), Err: UnknownNetworkError(net)}
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}
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if laddr == nil {
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laddr = &UDPAddr{}
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}
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l, err := listenPlan9(net, laddr)
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func listenUDP(network string, laddr *UDPAddr) (*UDPConn, error) {
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l, err := listenPlan9(network, laddr)
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if err != nil {
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return nil, err
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}
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_, err = l.ctl.WriteString("headers")
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if err != nil {
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return nil, &OpError{Op: "listen", Net: net, Source: nil, Addr: laddr, Err: err}
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return nil, err
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}
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l.data, err = os.OpenFile(l.dir+"/data", os.O_RDWR, 0)
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if err != nil {
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return nil, &OpError{Op: "listen", Net: net, Source: nil, Addr: laddr, Err: err}
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return nil, err
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}
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fd, err := l.netFD()
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return newUDPConn(fd), err
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}
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// ListenMulticastUDP listens for incoming multicast UDP packets
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// addressed to the group address gaddr on the interface ifi.
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// Network must be "udp", "udp4" or "udp6".
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// ListenMulticastUDP uses the system-assigned multicast interface
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// when ifi is nil, although this is not recommended because the
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// assignment depends on platforms and sometimes it might require
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// routing configuration.
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//
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// ListenMulticastUDP is just for convenience of simple, small
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// applications. There are golang.org/x/net/ipv4 and
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// golang.org/x/net/ipv6 packages for general purpose uses.
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func ListenMulticastUDP(network string, ifi *Interface, gaddr *UDPAddr) (*UDPConn, error) {
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return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: gaddr.opAddr(), Err: syscall.EPLAN9}
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func listenMulticastUDP(network string, ifi *Interface, gaddr *UDPAddr) (*UDPConn, error) {
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return nil, syscall.EPLAN9
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}
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@ -38,25 +38,7 @@ func (a *UDPAddr) sockaddr(family int) (syscall.Sockaddr, error) {
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return ipToSockaddr(family, a.IP, a.Port, a.Zone)
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||||
}
|
||||
|
||||
// UDPConn is the implementation of the Conn and PacketConn interfaces
|
||||
// for UDP network connections.
|
||||
type UDPConn struct {
|
||||
conn
|
||||
}
|
||||
|
||||
func newUDPConn(fd *netFD) *UDPConn { return &UDPConn{conn{fd}} }
|
||||
|
||||
// ReadFromUDP reads a UDP packet from c, copying the payload into b.
|
||||
// It returns the number of bytes copied into b and the return address
|
||||
// that was on the packet.
|
||||
//
|
||||
// ReadFromUDP can be made to time out and return an error with
|
||||
// Timeout() == true after a fixed time limit; see SetDeadline and
|
||||
// SetReadDeadline.
|
||||
func (c *UDPConn) ReadFromUDP(b []byte) (int, *UDPAddr, error) {
|
||||
if !c.ok() {
|
||||
return 0, nil, syscall.EINVAL
|
||||
}
|
||||
func (c *UDPConn) readFrom(b []byte) (int, *UDPAddr, error) {
|
||||
var addr *UDPAddr
|
||||
n, sa, err := c.fd.readFrom(b)
|
||||
switch sa := sa.(type) {
|
||||
@ -65,33 +47,10 @@ func (c *UDPConn) ReadFromUDP(b []byte) (int, *UDPAddr, error) {
|
||||
case *syscall.SockaddrInet6:
|
||||
addr = &UDPAddr{IP: sa.Addr[0:], Port: sa.Port, Zone: zoneToString(int(sa.ZoneId))}
|
||||
}
|
||||
if err != nil {
|
||||
err = &OpError{Op: "read", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
|
||||
}
|
||||
return n, addr, err
|
||||
}
|
||||
|
||||
// ReadFrom implements the PacketConn ReadFrom method.
|
||||
func (c *UDPConn) ReadFrom(b []byte) (int, Addr, error) {
|
||||
if !c.ok() {
|
||||
return 0, nil, syscall.EINVAL
|
||||
}
|
||||
n, addr, err := c.ReadFromUDP(b)
|
||||
if addr == nil {
|
||||
return n, nil, err
|
||||
}
|
||||
return n, addr, err
|
||||
}
|
||||
|
||||
// ReadMsgUDP reads a packet from c, copying the payload into b and
|
||||
// the associated out-of-band data into oob. It returns the number
|
||||
// of bytes copied into b, the number of bytes copied into oob, the
|
||||
// flags that were set on the packet and the source address of the
|
||||
// packet.
|
||||
func (c *UDPConn) ReadMsgUDP(b, oob []byte) (n, oobn, flags int, addr *UDPAddr, err error) {
|
||||
if !c.ok() {
|
||||
return 0, 0, 0, nil, syscall.EINVAL
|
||||
}
|
||||
func (c *UDPConn) readMsg(b, oob []byte) (n, oobn, flags int, addr *UDPAddr, err error) {
|
||||
var sa syscall.Sockaddr
|
||||
n, oobn, flags, sa, err = c.fd.readMsg(b, oob)
|
||||
switch sa := sa.(type) {
|
||||
@ -100,96 +59,35 @@ func (c *UDPConn) ReadMsgUDP(b, oob []byte) (n, oobn, flags int, addr *UDPAddr,
|
||||
case *syscall.SockaddrInet6:
|
||||
addr = &UDPAddr{IP: sa.Addr[0:], Port: sa.Port, Zone: zoneToString(int(sa.ZoneId))}
|
||||
}
|
||||
if err != nil {
|
||||
err = &OpError{Op: "read", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
// WriteToUDP writes a UDP packet to addr via c, copying the payload
|
||||
// from b.
|
||||
//
|
||||
// WriteToUDP can be made to time out and return an error with
|
||||
// Timeout() == true after a fixed time limit; see SetDeadline and
|
||||
// SetWriteDeadline. On packet-oriented connections, write timeouts
|
||||
// are rare.
|
||||
func (c *UDPConn) WriteToUDP(b []byte, addr *UDPAddr) (int, error) {
|
||||
if !c.ok() {
|
||||
return 0, syscall.EINVAL
|
||||
}
|
||||
func (c *UDPConn) writeTo(b []byte, addr *UDPAddr) (int, error) {
|
||||
if c.fd.isConnected {
|
||||
return 0, &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addr.opAddr(), Err: ErrWriteToConnected}
|
||||
return 0, ErrWriteToConnected
|
||||
}
|
||||
if addr == nil {
|
||||
return 0, &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: nil, Err: errMissingAddress}
|
||||
return 0, errMissingAddress
|
||||
}
|
||||
sa, err := addr.sockaddr(c.fd.family)
|
||||
if err != nil {
|
||||
return 0, &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addr.opAddr(), Err: err}
|
||||
return 0, err
|
||||
}
|
||||
n, err := c.fd.writeTo(b, sa)
|
||||
if err != nil {
|
||||
err = &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addr.opAddr(), Err: err}
|
||||
}
|
||||
return n, err
|
||||
return c.fd.writeTo(b, sa)
|
||||
}
|
||||
|
||||
// WriteTo implements the PacketConn WriteTo method.
|
||||
func (c *UDPConn) WriteTo(b []byte, addr Addr) (int, error) {
|
||||
if !c.ok() {
|
||||
return 0, syscall.EINVAL
|
||||
}
|
||||
a, ok := addr.(*UDPAddr)
|
||||
if !ok {
|
||||
return 0, &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addr, Err: syscall.EINVAL}
|
||||
}
|
||||
return c.WriteToUDP(b, a)
|
||||
}
|
||||
|
||||
// WriteMsgUDP writes a packet to addr via c if c isn't connected, or
|
||||
// to c's remote destination address if c is connected (in which case
|
||||
// addr must be nil). The payload is copied from b and the associated
|
||||
// out-of-band data is copied from oob. It returns the number of
|
||||
// payload and out-of-band bytes written.
|
||||
func (c *UDPConn) WriteMsgUDP(b, oob []byte, addr *UDPAddr) (n, oobn int, err error) {
|
||||
if !c.ok() {
|
||||
return 0, 0, syscall.EINVAL
|
||||
}
|
||||
func (c *UDPConn) writeMsg(b, oob []byte, addr *UDPAddr) (n, oobn int, err error) {
|
||||
if c.fd.isConnected && addr != nil {
|
||||
return 0, 0, &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addr.opAddr(), Err: ErrWriteToConnected}
|
||||
return 0, 0, ErrWriteToConnected
|
||||
}
|
||||
if !c.fd.isConnected && addr == nil {
|
||||
return 0, 0, &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addr.opAddr(), Err: errMissingAddress}
|
||||
return 0, 0, errMissingAddress
|
||||
}
|
||||
var sa syscall.Sockaddr
|
||||
sa, err = addr.sockaddr(c.fd.family)
|
||||
sa, err := addr.sockaddr(c.fd.family)
|
||||
if err != nil {
|
||||
return 0, 0, &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addr.opAddr(), Err: err}
|
||||
return 0, 0, err
|
||||
}
|
||||
n, oobn, err = c.fd.writeMsg(b, oob, sa)
|
||||
if err != nil {
|
||||
err = &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addr.opAddr(), Err: err}
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
// DialUDP connects to the remote address raddr on the network net,
|
||||
// which must be "udp", "udp4", or "udp6". If laddr is not nil, it is
|
||||
// used as the local address for the connection.
|
||||
func DialUDP(net string, laddr, raddr *UDPAddr) (*UDPConn, error) {
|
||||
switch net {
|
||||
case "udp", "udp4", "udp6":
|
||||
default:
|
||||
return nil, &OpError{Op: "dial", Net: net, Source: laddr.opAddr(), Addr: raddr.opAddr(), Err: UnknownNetworkError(net)}
|
||||
}
|
||||
if raddr == nil {
|
||||
return nil, &OpError{Op: "dial", Net: net, Source: laddr.opAddr(), Addr: nil, Err: errMissingAddress}
|
||||
}
|
||||
c, err := dialUDP(net, laddr, raddr, noDeadline)
|
||||
if err != nil {
|
||||
return nil, &OpError{Op: "dial", Net: net, Source: laddr.opAddr(), Addr: raddr.opAddr(), Err: err}
|
||||
}
|
||||
return c, nil
|
||||
return c.fd.writeMsg(b, oob, sa)
|
||||
}
|
||||
|
||||
func dialUDP(net string, laddr, raddr *UDPAddr, deadline time.Time) (*UDPConn, error) {
|
||||
@ -200,63 +98,29 @@ func dialUDP(net string, laddr, raddr *UDPAddr, deadline time.Time) (*UDPConn, e
|
||||
return newUDPConn(fd), nil
|
||||
}
|
||||
|
||||
// ListenUDP listens for incoming UDP packets addressed to the local
|
||||
// address laddr. Net must be "udp", "udp4", or "udp6". If laddr has
|
||||
// a port of 0, ListenUDP will choose an available port.
|
||||
// The LocalAddr method of the returned UDPConn can be used to
|
||||
// discover the port. The returned connection's ReadFrom and WriteTo
|
||||
// methods can be used to receive and send UDP packets with per-packet
|
||||
// addressing.
|
||||
func ListenUDP(net string, laddr *UDPAddr) (*UDPConn, error) {
|
||||
switch net {
|
||||
case "udp", "udp4", "udp6":
|
||||
default:
|
||||
return nil, &OpError{Op: "listen", Net: net, Source: nil, Addr: laddr.opAddr(), Err: UnknownNetworkError(net)}
|
||||
}
|
||||
if laddr == nil {
|
||||
laddr = &UDPAddr{}
|
||||
}
|
||||
fd, err := internetSocket(net, laddr, nil, noDeadline, syscall.SOCK_DGRAM, 0, "listen", noCancel)
|
||||
func listenUDP(network string, laddr *UDPAddr) (*UDPConn, error) {
|
||||
fd, err := internetSocket(network, laddr, nil, noDeadline, syscall.SOCK_DGRAM, 0, "listen", noCancel)
|
||||
if err != nil {
|
||||
return nil, &OpError{Op: "listen", Net: net, Source: nil, Addr: laddr, Err: err}
|
||||
return nil, err
|
||||
}
|
||||
return newUDPConn(fd), nil
|
||||
}
|
||||
|
||||
// ListenMulticastUDP listens for incoming multicast UDP packets
|
||||
// addressed to the group address gaddr on the interface ifi.
|
||||
// Network must be "udp", "udp4" or "udp6".
|
||||
// ListenMulticastUDP uses the system-assigned multicast interface
|
||||
// when ifi is nil, although this is not recommended because the
|
||||
// assignment depends on platforms and sometimes it might require
|
||||
// routing configuration.
|
||||
//
|
||||
// ListenMulticastUDP is just for convenience of simple, small
|
||||
// applications. There are golang.org/x/net/ipv4 and
|
||||
// golang.org/x/net/ipv6 packages for general purpose uses.
|
||||
func ListenMulticastUDP(network string, ifi *Interface, gaddr *UDPAddr) (*UDPConn, error) {
|
||||
switch network {
|
||||
case "udp", "udp4", "udp6":
|
||||
default:
|
||||
return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: gaddr.opAddr(), Err: UnknownNetworkError(network)}
|
||||
}
|
||||
if gaddr == nil || gaddr.IP == nil {
|
||||
return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: gaddr.opAddr(), Err: errMissingAddress}
|
||||
}
|
||||
func listenMulticastUDP(network string, ifi *Interface, gaddr *UDPAddr) (*UDPConn, error) {
|
||||
fd, err := internetSocket(network, gaddr, nil, noDeadline, syscall.SOCK_DGRAM, 0, "listen", noCancel)
|
||||
if err != nil {
|
||||
return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: gaddr, Err: err}
|
||||
return nil, err
|
||||
}
|
||||
c := newUDPConn(fd)
|
||||
if ip4 := gaddr.IP.To4(); ip4 != nil {
|
||||
if err := listenIPv4MulticastUDP(c, ifi, ip4); err != nil {
|
||||
c.Close()
|
||||
return nil, &OpError{Op: "listen", Net: network, Source: c.fd.laddr, Addr: &IPAddr{IP: ip4}, Err: err}
|
||||
return nil, err
|
||||
}
|
||||
} else {
|
||||
if err := listenIPv6MulticastUDP(c, ifi, gaddr.IP); err != nil {
|
||||
c.Close()
|
||||
return nil, &OpError{Op: "listen", Net: network, Source: c.fd.laddr, Addr: &IPAddr{IP: gaddr.IP}, Err: err}
|
||||
return nil, err
|
||||
}
|
||||
}
|
||||
return c, nil
|
||||
|
||||
Loading…
Reference in New Issue
Block a user