270 lines
6.9 KiB
Go
270 lines
6.9 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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//go:build aix || darwin || dragonfly || freebsd || hurd || (js && wasm) || linux || netbsd || openbsd || solaris || windows
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package net
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import (
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"context"
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"net/netip"
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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: zoneCache.name(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, addr *UDPAddr) (int, *UDPAddr, error) {
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var n int
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var err error
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switch c.fd.family {
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case syscall.AF_INET:
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var from syscall.SockaddrInet4
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n, err = c.fd.readFromInet4(b, &from)
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if err == nil {
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ip := from.Addr // copy from.Addr; ip escapes, so this line allocates 4 bytes
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*addr = UDPAddr{IP: ip[:], Port: from.Port}
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}
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case syscall.AF_INET6:
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var from syscall.SockaddrInet6
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n, err = c.fd.readFromInet6(b, &from)
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if err == nil {
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ip := from.Addr // copy from.Addr; ip escapes, so this line allocates 16 bytes
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*addr = UDPAddr{IP: ip[:], Port: from.Port, Zone: zoneCache.name(int(from.ZoneId))}
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}
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}
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if err != nil {
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// No sockaddr, so don't return UDPAddr.
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addr = nil
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}
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return n, addr, err
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}
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func (c *UDPConn) readFromAddrPort(b []byte) (n int, addr netip.AddrPort, err error) {
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var ip netip.Addr
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var port int
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switch c.fd.family {
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case syscall.AF_INET:
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var from syscall.SockaddrInet4
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n, err = c.fd.readFromInet4(b, &from)
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if err == nil {
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ip = netip.AddrFrom4(from.Addr)
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port = from.Port
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}
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case syscall.AF_INET6:
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var from syscall.SockaddrInet6
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n, err = c.fd.readFromInet6(b, &from)
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if err == nil {
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ip = netip.AddrFrom16(from.Addr).WithZone(zoneCache.name(int(from.ZoneId)))
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port = from.Port
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}
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}
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if err == nil {
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addr = netip.AddrPortFrom(ip, uint16(port))
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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 netip.AddrPort, err error) {
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switch c.fd.family {
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case syscall.AF_INET:
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var sa syscall.SockaddrInet4
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n, oobn, flags, err = c.fd.readMsgInet4(b, oob, 0, &sa)
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ip := netip.AddrFrom4(sa.Addr)
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addr = netip.AddrPortFrom(ip, uint16(sa.Port))
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case syscall.AF_INET6:
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var sa syscall.SockaddrInet6
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n, oobn, flags, err = c.fd.readMsgInet6(b, oob, 0, &sa)
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ip := netip.AddrFrom16(sa.Addr).WithZone(zoneCache.name(int(sa.ZoneId)))
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addr = netip.AddrPortFrom(ip, uint16(sa.Port))
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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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switch c.fd.family {
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case syscall.AF_INET:
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sa, err := ipToSockaddrInet4(addr.IP, addr.Port)
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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.writeToInet4(b, &sa)
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case syscall.AF_INET6:
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sa, err := ipToSockaddrInet6(addr.IP, addr.Port, addr.Zone)
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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.writeToInet6(b, &sa)
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default:
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return 0, &AddrError{Err: "invalid address family", Addr: addr.IP.String()}
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}
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}
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func (c *UDPConn) writeToAddrPort(b []byte, addr netip.AddrPort) (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.IsValid() {
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return 0, errMissingAddress
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}
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switch c.fd.family {
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case syscall.AF_INET:
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sa, err := addrPortToSockaddrInet4(addr)
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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.writeToInet4(b, &sa)
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case syscall.AF_INET6:
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sa, err := addrPortToSockaddrInet6(addr)
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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.writeToInet6(b, &sa)
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default:
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return 0, &AddrError{Err: "invalid address family", Addr: addr.Addr().String()}
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}
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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 (c *UDPConn) writeMsgAddrPort(b, oob []byte, addr netip.AddrPort) (n, oobn int, err error) {
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if c.fd.isConnected && addr.IsValid() {
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return 0, 0, ErrWriteToConnected
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}
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if !c.fd.isConnected && !addr.IsValid() {
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return 0, 0, errMissingAddress
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}
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switch c.fd.family {
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case syscall.AF_INET:
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sa, err := addrPortToSockaddrInet4(addr)
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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.writeMsgInet4(b, oob, &sa)
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case syscall.AF_INET6:
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sa, err := addrPortToSockaddrInet6(addr)
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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.writeMsgInet6(b, oob, &sa)
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default:
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return 0, 0, &AddrError{Err: "invalid address family", Addr: addr.Addr().String()}
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}
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}
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func (sd *sysDialer) dialUDP(ctx context.Context, laddr, raddr *UDPAddr) (*UDPConn, error) {
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fd, err := internetSocket(ctx, sd.network, laddr, raddr, syscall.SOCK_DGRAM, 0, "dial", sd.Dialer.Control)
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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 (sl *sysListener) listenUDP(ctx context.Context, laddr *UDPAddr) (*UDPConn, error) {
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fd, err := internetSocket(ctx, sl.network, laddr, nil, syscall.SOCK_DGRAM, 0, "listen", sl.ListenConfig.Control)
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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 (sl *sysListener) listenMulticastUDP(ctx context.Context, ifi *Interface, gaddr *UDPAddr) (*UDPConn, error) {
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fd, err := internetSocket(ctx, sl.network, gaddr, nil, syscall.SOCK_DGRAM, 0, "listen", sl.ListenConfig.Control)
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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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