Adding upstream version 1.21.8.upstream/1.21.8

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 368 insertions, 0 deletions

diff --git a/src/net/udpsock.go b/src/net/udpsock.go
new file mode 100644
index 0000000..e30624d
--- /dev/null
+++ b/src/net/udpsock.go
@@ -0,0 +1,368 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package net
+
+import (
+	"context"
+	"internal/itoa"
+	"net/netip"
+	"syscall"
+)
+
+// BUG(mikio): On Plan 9, the ReadMsgUDP and
+// WriteMsgUDP methods of UDPConn are not implemented.
+
+// BUG(mikio): On Windows, the File method of UDPConn is not
+// implemented.
+
+// BUG(mikio): On JS, methods and functions related to UDPConn are not
+// implemented.
+
+// UDPAddr represents the address of a UDP end point.
+type UDPAddr struct {
+	IP   IP
+	Port int
+	Zone string // IPv6 scoped addressing zone
+}
+
+// AddrPort returns the UDPAddr a as a netip.AddrPort.
+//
+// If a.Port does not fit in a uint16, it's silently truncated.
+//
+// If a is nil, a zero value is returned.
+func (a *UDPAddr) AddrPort() netip.AddrPort {
+	if a == nil {
+		return netip.AddrPort{}
+	}
+	na, _ := netip.AddrFromSlice(a.IP)
+	na = na.WithZone(a.Zone)
+	return netip.AddrPortFrom(na, uint16(a.Port))
+}
+
+// Network returns the address's network name, "udp".
+func (a *UDPAddr) Network() string { return "udp" }
+
+func (a *UDPAddr) String() string {
+	if a == nil {
+		return "<nil>"
+	}
+	ip := ipEmptyString(a.IP)
+	if a.Zone != "" {
+		return JoinHostPort(ip+"%"+a.Zone, itoa.Itoa(a.Port))
+	}
+	return JoinHostPort(ip, itoa.Itoa(a.Port))
+}
+
+func (a *UDPAddr) isWildcard() bool {
+	if a == nil || a.IP == nil {
+		return true
+	}
+	return a.IP.IsUnspecified()
+}
+
+func (a *UDPAddr) opAddr() Addr {
+	if a == nil {
+		return nil
+	}
+	return a
+}
+
+// ResolveUDPAddr returns an address of UDP end point.
+//
+// The network must be a UDP network name.
+//
+// If the host in the address parameter is not a literal IP address or
+// the port is not a literal port number, ResolveUDPAddr resolves the
+// address to an address of UDP end point.
+// Otherwise, it parses the address as a pair of literal IP address
+// and port number.
+// The address parameter can use a host name, but this is not
+// recommended, because it will return at most one of the host name's
+// IP addresses.
+//
+// See func Dial for a description of the network and address
+// parameters.
+func ResolveUDPAddr(network, address string) (*UDPAddr, error) {
+	switch network {
+	case "udp", "udp4", "udp6":
+	case "": // a hint wildcard for Go 1.0 undocumented behavior
+		network = "udp"
+	default:
+		return nil, UnknownNetworkError(network)
+	}
+	addrs, err := DefaultResolver.internetAddrList(context.Background(), network, address)
+	if err != nil {
+		return nil, err
+	}
+	return addrs.forResolve(network, address).(*UDPAddr), nil
+}
+
+// UDPAddrFromAddrPort returns addr as a UDPAddr. If addr.IsValid() is false,
+// then the returned UDPAddr will contain a nil IP field, indicating an
+// address family-agnostic unspecified address.
+func UDPAddrFromAddrPort(addr netip.AddrPort) *UDPAddr {
+	return &UDPAddr{
+		IP:   addr.Addr().AsSlice(),
+		Zone: addr.Addr().Zone(),
+		Port: int(addr.Port()),
+	}
+}
+
+// An addrPortUDPAddr is a netip.AddrPort-based UDP address that satisfies the Addr interface.
+type addrPortUDPAddr struct {
+	netip.AddrPort
+}
+
+func (addrPortUDPAddr) Network() string { return "udp" }
+
+// UDPConn is the implementation of the Conn and PacketConn interfaces
+// for UDP network connections.
+type UDPConn struct {
+	conn
+}
+
+// SyscallConn returns a raw network connection.
+// This implements the syscall.Conn interface.
+func (c *UDPConn) SyscallConn() (syscall.RawConn, error) {
+	if !c.ok() {
+		return nil, syscall.EINVAL
+	}
+	return newRawConn(c.fd)
+}
+
+// ReadFromUDP acts like ReadFrom but returns a UDPAddr.
+func (c *UDPConn) ReadFromUDP(b []byte) (n int, addr *UDPAddr, err error) {
+	// This function is designed to allow the caller to control the lifetime
+	// of the returned *UDPAddr and thereby prevent an allocation.
+	// See https://blog.filippo.io/efficient-go-apis-with-the-inliner/.
+	// The real work is done by readFromUDP, below.
+	return c.readFromUDP(b, &UDPAddr{})
+}
+
+// readFromUDP implements ReadFromUDP.
+func (c *UDPConn) readFromUDP(b []byte, addr *UDPAddr) (int, *UDPAddr, error) {
+	if !c.ok() {
+		return 0, nil, syscall.EINVAL
+	}
+	n, addr, err := c.readFrom(b, addr)
+	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) {
+	n, addr, err := c.readFromUDP(b, &UDPAddr{})
+	if addr == nil {
+		// Return Addr(nil), not Addr(*UDPConn(nil)).
+		return n, nil, err
+	}
+	return n, addr, err
+}
+
+// ReadFromUDPAddrPort acts like ReadFrom but returns a netip.AddrPort.
+//
+// If c is bound to an unspecified address, the returned
+// netip.AddrPort's address might be an IPv4-mapped IPv6 address.
+// Use netip.Addr.Unmap to get the address without the IPv6 prefix.
+func (c *UDPConn) ReadFromUDPAddrPort(b []byte) (n int, addr netip.AddrPort, err error) {
+	if !c.ok() {
+		return 0, netip.AddrPort{}, syscall.EINVAL
+	}
+	n, addr, err = c.readFromAddrPort(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
+}
+
+// ReadMsgUDP reads a message 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 message and the source address of the message.
+//
+// The packages golang.org/x/net/ipv4 and golang.org/x/net/ipv6 can be
+// used to manipulate IP-level socket options in oob.
+func (c *UDPConn) ReadMsgUDP(b, oob []byte) (n, oobn, flags int, addr *UDPAddr, err error) {
+	var ap netip.AddrPort
+	n, oobn, flags, ap, err = c.ReadMsgUDPAddrPort(b, oob)
+	if ap.IsValid() {
+		addr = UDPAddrFromAddrPort(ap)
+	}
+	return
+}
+
+// ReadMsgUDPAddrPort is like ReadMsgUDP but returns an netip.AddrPort instead of a UDPAddr.
+func (c *UDPConn) ReadMsgUDPAddrPort(b, oob []byte) (n, oobn, flags int, addr netip.AddrPort, err error) {
+	if !c.ok() {
+		return 0, 0, 0, netip.AddrPort{}, 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 acts like WriteTo but takes a UDPAddr.
+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
+}
+
+// WriteToUDPAddrPort acts like WriteTo but takes a netip.AddrPort.
+func (c *UDPConn) WriteToUDPAddrPort(b []byte, addr netip.AddrPort) (int, error) {
+	if !c.ok() {
+		return 0, syscall.EINVAL
+	}
+	n, err := c.writeToAddrPort(b, addr)
+	if err != nil {
+		err = &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addrPortUDPAddr{addr}, 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 message to addr via c if c isn't connected, or
+// to c's remote 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.
+//
+// The packages golang.org/x/net/ipv4 and golang.org/x/net/ipv6 can be
+// used to manipulate IP-level socket options in oob.
+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
+}
+
+// WriteMsgUDPAddrPort is like WriteMsgUDP but takes a netip.AddrPort instead of a UDPAddr.
+func (c *UDPConn) WriteMsgUDPAddrPort(b, oob []byte, addr netip.AddrPort) (n, oobn int, err error) {
+	if !c.ok() {
+		return 0, 0, syscall.EINVAL
+	}
+	n, oobn, err = c.writeMsgAddrPort(b, oob, addr)
+	if err != nil {
+		err = &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addrPortUDPAddr{addr}, Err: err}
+	}
+	return
+}
+
+func newUDPConn(fd *netFD) *UDPConn { return &UDPConn{conn{fd}} }
+
+// DialUDP acts like Dial for UDP networks.
+//
+// The network must be a UDP network name; see func Dial for details.
+//
+// If laddr is nil, a local address is automatically chosen.
+// If the IP field of raddr is nil or an unspecified IP address, the
+// local system is assumed.
+func DialUDP(network string, laddr, raddr *UDPAddr) (*UDPConn, error) {
+	switch network {
+	case "udp", "udp4", "udp6":
+	default:
+		return nil, &OpError{Op: "dial", Net: network, Source: laddr.opAddr(), Addr: raddr.opAddr(), Err: UnknownNetworkError(network)}
+	}
+	if raddr == nil {
+		return nil, &OpError{Op: "dial", Net: network, Source: laddr.opAddr(), Addr: nil, Err: errMissingAddress}
+	}
+	sd := &sysDialer{network: network, address: raddr.String()}
+	c, err := sd.dialUDP(context.Background(), laddr, raddr)
+	if err != nil {
+		return nil, &OpError{Op: "dial", Net: network, Source: laddr.opAddr(), Addr: raddr.opAddr(), Err: err}
+	}
+	return c, nil
+}
+
+// ListenUDP acts like ListenPacket for UDP networks.
+//
+// The network must be a UDP network name; see func Dial for details.
+//
+// If the IP field of laddr is nil or an unspecified IP address,
+// ListenUDP listens on all available IP addresses of the local system
+// except multicast IP addresses.
+// If the Port field of laddr is 0, a port number is automatically
+// chosen.
+func ListenUDP(network string, laddr *UDPAddr) (*UDPConn, error) {
+	switch network {
+	case "udp", "udp4", "udp6":
+	default:
+		return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: laddr.opAddr(), Err: UnknownNetworkError(network)}
+	}
+	if laddr == nil {
+		laddr = &UDPAddr{}
+	}
+	sl := &sysListener{network: network, address: laddr.String()}
+	c, err := sl.listenUDP(context.Background(), laddr)
+	if err != nil {
+		return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: laddr.opAddr(), Err: err}
+	}
+	return c, nil
+}
+
+// ListenMulticastUDP acts like ListenPacket for UDP networks but
+// takes a group address on a specific network interface.
+//
+// The network must be a UDP network name; see func Dial for details.
+//
+// ListenMulticastUDP listens on all available IP addresses of the
+// local system including the group, multicast IP address.
+// If ifi is nil, ListenMulticastUDP uses the system-assigned
+// multicast interface, although this is not recommended because the
+// assignment depends on platforms and sometimes it might require
+// routing configuration.
+// If the Port field of gaddr is 0, a port number is automatically
+// chosen.
+//
+// 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.
+//
+// Note that ListenMulticastUDP will set the IP_MULTICAST_LOOP socket option
+// to 0 under IPPROTO_IP, to disable loopback of multicast packets.
+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}
+	}
+	sl := &sysListener{network: network, address: gaddr.String()}
+	c, err := sl.listenMulticastUDP(context.Background(), ifi, gaddr)
+	if err != nil {
+		return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: gaddr.opAddr(), Err: err}
+	}
+	return c, nil
+}