1 files changed, 161 insertions, 0 deletions
diff --git a/src/net/udpsock_posix.go b/src/net/udpsock_posix.go
new file mode 100644
index 0000000..bbfa4ed
--- /dev/null
+++ b/src/net/udpsock_posix.go
@@ -0,0 +1,161 @@
+// 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.
+
+// +build aix darwin dragonfly freebsd js,wasm linux netbsd openbsd solaris windows
+
+package net
+
+import (
+	"context"
+	"syscall"
+)
+
+func sockaddrToUDP(sa syscall.Sockaddr) Addr {
+	switch sa := sa.(type) {
+	case *syscall.SockaddrInet4:
+		return &UDPAddr{IP: sa.Addr[0:], Port: sa.Port}
+	case *syscall.SockaddrInet6:
+		return &UDPAddr{IP: sa.Addr[0:], Port: sa.Port, Zone: zoneCache.name(int(sa.ZoneId))}
+	}
+	return nil
+}
+
+func (a *UDPAddr) family() int {
+	if a == nil || len(a.IP) <= IPv4len {
+		return syscall.AF_INET
+	}
+	if a.IP.To4() != nil {
+		return syscall.AF_INET
+	}
+	return syscall.AF_INET6
+}
+
+func (a *UDPAddr) sockaddr(family int) (syscall.Sockaddr, error) {
+	if a == nil {
+		return nil, nil
+	}
+	return ipToSockaddr(family, a.IP, a.Port, a.Zone)
+}
+
+func (a *UDPAddr) toLocal(net string) sockaddr {
+	return &UDPAddr{loopbackIP(net), a.Port, a.Zone}
+}
+
+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.SockaddrInet4:
+		addr = &UDPAddr{IP: sa.Addr[0:], Port: sa.Port}
+	case *syscall.SockaddrInet6:
+		addr = &UDPAddr{IP: sa.Addr[0:], Port: sa.Port, Zone: zoneCache.name(int(sa.ZoneId))}
+	}
+	return n, addr, err
+}
+
+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.SockaddrInet4:
+		addr = &UDPAddr{IP: sa.Addr[0:], Port: sa.Port}
+	case *syscall.SockaddrInet6:
+		addr = &UDPAddr{IP: sa.Addr[0:], Port: sa.Port, Zone: zoneCache.name(int(sa.ZoneId))}
+	}
+	return
+}
+
+func (c *UDPConn) writeTo(b []byte, addr *UDPAddr) (int, error) {
+	if c.fd.isConnected {
+		return 0, ErrWriteToConnected
+	}
+	if addr == nil {
+		return 0, errMissingAddress
+	}
+	sa, err := addr.sockaddr(c.fd.family)
+	if err != nil {
+		return 0, err
+	}
+	return c.fd.writeTo(b, sa)
+}
+
+func (c *UDPConn) writeMsg(b, oob []byte, addr *UDPAddr) (n, oobn int, err error) {
+	if c.fd.isConnected && addr != nil {
+		return 0, 0, ErrWriteToConnected
+	}
+	if !c.fd.isConnected && addr == nil {
+		return 0, 0, errMissingAddress
+	}
+	sa, err := addr.sockaddr(c.fd.family)
+	if err != nil {
+		return 0, 0, err
+	}
+	return c.fd.writeMsg(b, oob, sa)
+}
+
+func (sd *sysDialer) dialUDP(ctx context.Context, laddr, raddr *UDPAddr) (*UDPConn, error) {
+	fd, err := internetSocket(ctx, sd.network, laddr, raddr, syscall.SOCK_DGRAM, 0, "dial", sd.Dialer.Control)
+	if err != nil {
+		return nil, err
+	}
+	return newUDPConn(fd), nil
+}
+
+func (sl *sysListener) listenUDP(ctx context.Context, laddr *UDPAddr) (*UDPConn, error) {
+	fd, err := internetSocket(ctx, sl.network, laddr, nil, syscall.SOCK_DGRAM, 0, "listen", sl.ListenConfig.Control)
+	if err != nil {
+		return nil, err
+	}
+	return newUDPConn(fd), nil
+}
+
+func (sl *sysListener) listenMulticastUDP(ctx context.Context, ifi *Interface, gaddr *UDPAddr) (*UDPConn, error) {
+	fd, err := internetSocket(ctx, sl.network, gaddr, nil, syscall.SOCK_DGRAM, 0, "listen", sl.ListenConfig.Control)
+	if err != nil {
+		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, err
+		}
+	} else {
+		if err := listenIPv6MulticastUDP(c, ifi, gaddr.IP); err != nil {
+			c.Close()
+			return nil, err
+		}
+	}
+	return c, nil
+}
+
+func listenIPv4MulticastUDP(c *UDPConn, ifi *Interface, ip IP) error {
+	if ifi != nil {
+		if err := setIPv4MulticastInterface(c.fd, ifi); err != nil {
+			return err
+		}
+	}
+	if err := setIPv4MulticastLoopback(c.fd, false); err != nil {
+		return err
+	}
+	if err := joinIPv4Group(c.fd, ifi, ip); err != nil {
+		return err
+	}
+	return nil
+}
+
+func listenIPv6MulticastUDP(c *UDPConn, ifi *Interface, ip IP) error {
+	if ifi != nil {
+		if err := setIPv6MulticastInterface(c.fd, ifi); err != nil {
+			return err
+		}
+	}
+	if err := setIPv6MulticastLoopback(c.fd, false); err != nil {
+		return err
+	}
+	if err := joinIPv6Group(c.fd, ifi, ip); err != nil {
+		return err
+	}
+	return nil
+}