mirror of
https://github.com/autc04/Retro68.git
synced 2024-09-07 13:54:33 +00:00
162 lines
4.0 KiB
Go
162 lines
4.0 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris windows
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package net
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import (
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"context"
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"syscall"
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)
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func sockaddrToUDP(sa syscall.Sockaddr) Addr {
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switch sa := sa.(type) {
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case *syscall.SockaddrInet4:
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return &UDPAddr{IP: sa.Addr[0:], Port: sa.Port}
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case *syscall.SockaddrInet6:
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return &UDPAddr{IP: sa.Addr[0:], Port: sa.Port, Zone: zoneToString(int(sa.ZoneId))}
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}
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return nil
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}
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func (a *UDPAddr) family() int {
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if a == nil || len(a.IP) <= IPv4len {
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return syscall.AF_INET
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}
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if a.IP.To4() != nil {
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return syscall.AF_INET
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}
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return syscall.AF_INET6
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}
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func (a *UDPAddr) sockaddr(family int) (syscall.Sockaddr, error) {
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if a == nil {
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return nil, nil
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}
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return ipToSockaddr(family, a.IP, a.Port, a.Zone)
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}
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func (a *UDPAddr) toLocal(net string) sockaddr {
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return &UDPAddr{loopbackIP(net), a.Port, a.Zone}
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}
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func (c *UDPConn) readFrom(b []byte) (int, *UDPAddr, error) {
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var addr *UDPAddr
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n, sa, err := c.fd.readFrom(b)
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switch sa := sa.(type) {
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case *syscall.SockaddrInet4:
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addr = &UDPAddr{IP: sa.Addr[0:], Port: sa.Port}
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case *syscall.SockaddrInet6:
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addr = &UDPAddr{IP: sa.Addr[0:], Port: sa.Port, Zone: zoneToString(int(sa.ZoneId))}
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}
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return n, addr, err
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}
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func (c *UDPConn) readMsg(b, oob []byte) (n, oobn, flags int, addr *UDPAddr, err error) {
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var sa syscall.Sockaddr
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n, oobn, flags, sa, err = c.fd.readMsg(b, oob)
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switch sa := sa.(type) {
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case *syscall.SockaddrInet4:
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addr = &UDPAddr{IP: sa.Addr[0:], Port: sa.Port}
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case *syscall.SockaddrInet6:
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addr = &UDPAddr{IP: sa.Addr[0:], Port: sa.Port, Zone: zoneToString(int(sa.ZoneId))}
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}
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return
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}
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func (c *UDPConn) writeTo(b []byte, addr *UDPAddr) (int, error) {
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if c.fd.isConnected {
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return 0, ErrWriteToConnected
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}
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if addr == nil {
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return 0, errMissingAddress
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}
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sa, err := addr.sockaddr(c.fd.family)
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if err != nil {
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return 0, err
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}
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return c.fd.writeTo(b, sa)
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}
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func (c *UDPConn) writeMsg(b, oob []byte, addr *UDPAddr) (n, oobn int, err error) {
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if c.fd.isConnected && addr != nil {
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return 0, 0, ErrWriteToConnected
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}
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if !c.fd.isConnected && addr == nil {
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return 0, 0, errMissingAddress
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}
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sa, err := addr.sockaddr(c.fd.family)
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if err != nil {
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return 0, 0, err
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}
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return c.fd.writeMsg(b, oob, sa)
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}
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func dialUDP(ctx context.Context, net string, laddr, raddr *UDPAddr) (*UDPConn, error) {
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fd, err := internetSocket(ctx, net, laddr, raddr, syscall.SOCK_DGRAM, 0, "dial")
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if err != nil {
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return nil, err
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}
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return newUDPConn(fd), nil
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}
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func listenUDP(ctx context.Context, network string, laddr *UDPAddr) (*UDPConn, error) {
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fd, err := internetSocket(ctx, network, laddr, nil, syscall.SOCK_DGRAM, 0, "listen")
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if err != nil {
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return nil, err
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}
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return newUDPConn(fd), nil
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}
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func listenMulticastUDP(ctx context.Context, network string, ifi *Interface, gaddr *UDPAddr) (*UDPConn, error) {
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fd, err := internetSocket(ctx, network, gaddr, nil, syscall.SOCK_DGRAM, 0, "listen")
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if err != nil {
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return nil, err
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}
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c := newUDPConn(fd)
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if ip4 := gaddr.IP.To4(); ip4 != nil {
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if err := listenIPv4MulticastUDP(c, ifi, ip4); err != nil {
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c.Close()
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return nil, err
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}
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} else {
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if err := listenIPv6MulticastUDP(c, ifi, gaddr.IP); err != nil {
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c.Close()
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return nil, err
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}
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}
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return c, nil
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}
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func listenIPv4MulticastUDP(c *UDPConn, ifi *Interface, ip IP) error {
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if ifi != nil {
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if err := setIPv4MulticastInterface(c.fd, ifi); err != nil {
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return err
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}
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}
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if err := setIPv4MulticastLoopback(c.fd, false); err != nil {
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return err
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}
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if err := joinIPv4Group(c.fd, ifi, ip); err != nil {
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return err
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}
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return nil
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}
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func listenIPv6MulticastUDP(c *UDPConn, ifi *Interface, ip IP) error {
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if ifi != nil {
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if err := setIPv6MulticastInterface(c.fd, ifi); err != nil {
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return err
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}
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}
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if err := setIPv6MulticastLoopback(c.fd, false); err != nil {
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return err
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}
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if err := joinIPv6Group(c.fd, ifi, ip); err != nil {
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return err
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}
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return nil
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}
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