package net
+import "syscall"
+
// UDPAddr represents the address of a UDP end point.
type UDPAddr struct {
IP IP
}
return addrs.first(isIPv4).(*UDPAddr), nil
}
+
+// UDPConn is the implementation of the Conn and PacketConn interfaces
+// for UDP network connections.
+type UDPConn struct {
+ conn
+}
+
+// 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
+ }
+ n, addr, err := c.readFrom(b)
+ 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.readFrom(b)
+ if err != nil {
+ err = &OpError{Op: "read", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
+ }
+ 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
+ }
+ n, oobn, flags, addr, err = c.readMsg(b, oob)
+ 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
+ }
+ n, err := c.writeTo(b, addr)
+ if err != nil {
+ err = &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addr.opAddr(), Err: err}
+ }
+ return n, err
+}
+
+// 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}
+ }
+ n, err := c.writeTo(b, a)
+ if err != nil {
+ err = &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: a.opAddr(), Err: err}
+ }
+ return n, err
+}
+
+// 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
+ }
+ n, oobn, err = c.writeMsg(b, oob, addr)
+ if err != nil {
+ err = &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addr.opAddr(), Err: err}
+ }
+ return
+}
+
+func newUDPConn(fd *netFD) *UDPConn { return &UDPConn{conn{fd}} }
+
+// 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
+}
+
+// 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{}
+ }
+ c, err := listenUDP(net, laddr)
+ if err != nil {
+ return nil, &OpError{Op: "listen", Net: net, Source: nil, Addr: laddr.opAddr(), Err: err}
+ }
+ return c, 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}
+ }
+ c, err := listenMulticastUDP(network, ifi, gaddr)
+ if err != nil {
+ return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: gaddr.opAddr(), Err: err}
+ }
+ return c, nil
+}
"time"
)
-// 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) (n int, addr *UDPAddr, err error) {
- if !c.ok() || c.fd.data == nil {
- return 0, nil, syscall.EINVAL
- }
+func (c *UDPConn) readFrom(b []byte) (n int, addr *UDPAddr, err error) {
buf := make([]byte, udpHeaderSize+len(b))
- m, err := c.fd.data.Read(buf)
+ m, err := c.fd.Read(buf)
if err != nil {
- return 0, nil, &OpError{Op: "read", Net: c.fd.dir, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
+ return 0, nil, err
}
if m < udpHeaderSize {
- 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")}
+ return 0, nil, errors.New("short read reading UDP header")
}
buf = buf[:m]
return n, &UDPAddr{IP: h.raddr, Port: int(h.rport)}, nil
}
-// ReadFrom implements the PacketConn ReadFrom method.
-func (c *UDPConn) ReadFrom(b []byte) (int, Addr, error) {
- if !c.ok() {
- return 0, nil, syscall.EINVAL
- }
- return c.ReadFromUDP(b)
+func (c *UDPConn) readMsg(b, oob []byte) (n, oobn, flags int, addr *UDPAddr, err error) {
+ return 0, 0, 0, nil, syscall.EPLAN9
}
-// 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) {
- return 0, 0, 0, nil, &OpError{Op: "read", Net: c.fd.dir, Source: c.fd.laddr, Addr: c.fd.raddr, Err: syscall.EPLAN9}
-}
-
-// 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() || c.fd.data == nil {
- return 0, syscall.EINVAL
- }
+func (c *UDPConn) writeTo(b []byte, addr *UDPAddr) (int, error) {
if addr == nil {
- return 0, &OpError{Op: "write", Net: c.fd.dir, Source: c.fd.laddr, Addr: nil, Err: errMissingAddress}
+ return 0, errMissingAddress
}
h := new(udpHeader)
h.raddr = addr.IP.To16()
buf := make([]byte, udpHeaderSize+len(b))
i := copy(buf, h.Bytes())
copy(buf[i:], b)
- if _, err := c.fd.data.Write(buf); err != nil {
- return 0, &OpError{Op: "write", Net: c.fd.dir, Source: c.fd.laddr, Addr: addr.opAddr(), Err: err}
+ if _, err := c.fd.Write(buf); err != nil {
+ return 0, err
}
return len(b), nil
}
-// 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.dir, 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) {
- return 0, 0, &OpError{Op: "write", Net: c.fd.dir, Source: c.fd.laddr, Addr: addr.opAddr(), Err: syscall.EPLAN9}
-}
-
-// 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) {
- 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
+func (c *UDPConn) writeMsg(b, oob []byte, addr *UDPAddr) (n, oobn int, err error) {
+ return 0, 0, syscall.EPLAN9
}
func dialUDP(net string, laddr, raddr *UDPAddr, deadline time.Time) (*UDPConn, error) {
if !deadline.IsZero() {
panic("net.dialUDP: deadline not implemented on Plan 9")
}
- switch net {
- case "udp", "udp4", "udp6":
- default:
- return nil, UnknownNetworkError(net)
- }
- if raddr == nil {
- return nil, errMissingAddress
- }
fd, err := dialPlan9(net, laddr, raddr)
if err != nil {
return nil, err
return h, b
}
-// 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{}
- }
- l, err := listenPlan9(net, laddr)
+func listenUDP(network string, laddr *UDPAddr) (*UDPConn, error) {
+ l, err := listenPlan9(network, laddr)
if err != nil {
return nil, err
}
_, err = l.ctl.WriteString("headers")
if err != nil {
- return nil, &OpError{Op: "listen", Net: net, Source: nil, Addr: laddr, Err: err}
+ return nil, err
}
l.data, err = os.OpenFile(l.dir+"/data", os.O_RDWR, 0)
if err != nil {
- return nil, &OpError{Op: "listen", Net: net, Source: nil, Addr: laddr, Err: err}
+ return nil, err
}
fd, err := l.netFD()
return newUDPConn(fd), err
}
-// 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) {
- return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: gaddr.opAddr(), Err: syscall.EPLAN9}
+func listenMulticastUDP(network string, ifi *Interface, gaddr *UDPAddr) (*UDPConn, error) {
+ return nil, syscall.EPLAN9
}
return ipToSockaddr(family, a.IP, a.Port, a.Zone)
}
-// 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) {
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) {
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}
- }
- var sa syscall.Sockaddr
- 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}
- }
- 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}
+ return 0, 0, errMissingAddress
}
- c, err := dialUDP(net, laddr, raddr, noDeadline)
+ sa, err := addr.sockaddr(c.fd.family)
if err != nil {
- return nil, &OpError{Op: "dial", Net: net, Source: laddr.opAddr(), Addr: raddr.opAddr(), Err: err}
+ return 0, 0, err
}
- return c, nil
+ return c.fd.writeMsg(b, oob, sa)
}
func dialUDP(net string, laddr, raddr *UDPAddr, deadline time.Time) (*UDPConn, error) {
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