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// Copyright 2010 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.
//go:build unix || (js && wasm) || windows
package net
import (
"context"
"syscall"
)
func sockaddrToIP(sa syscall.Sockaddr) Addr {
switch sa := sa.(type) {
case *syscall.SockaddrInet4:
return &IPAddr{IP: sa.Addr[0:]}
case *syscall.SockaddrInet6:
return &IPAddr{IP: sa.Addr[0:], Zone: zoneCache.name(int(sa.ZoneId))}
}
return nil
}
func (a *IPAddr) 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 *IPAddr) sockaddr(family int) (syscall.Sockaddr, error) {
if a == nil {
return nil, nil
}
return ipToSockaddr(family, a.IP, 0, a.Zone)
}
func (a *IPAddr) toLocal(net string) sockaddr {
return &IPAddr{loopbackIP(net), a.Zone}
}
func (c *IPConn) readFrom(b []byte) (int, *IPAddr, error) {
// TODO(cw,rsc): consider using readv if we know the family
// type to avoid the header trim/copy
var addr *IPAddr
n, sa, err := c.fd.readFrom(b)
switch sa := sa.(type) {
case *syscall.SockaddrInet4:
addr = &IPAddr{IP: sa.Addr[0:]}
n = stripIPv4Header(n, b)
case *syscall.SockaddrInet6:
addr = &IPAddr{IP: sa.Addr[0:], Zone: zoneCache.name(int(sa.ZoneId))}
}
return n, addr, err
}
func stripIPv4Header(n int, b []byte) int {
if len(b) < 20 {
return n
}
l := int(b[0]&0x0f) << 2
if 20 > l || l > len(b) {
return n
}
if b[0]>>4 != 4 {
return n
}
copy(b, b[l:])
return n - l
}
func (c *IPConn) readMsg(b, oob []byte) (n, oobn, flags int, addr *IPAddr, err error) {
var sa syscall.Sockaddr
n, oobn, flags, sa, err = c.fd.readMsg(b, oob, 0)
switch sa := sa.(type) {
case *syscall.SockaddrInet4:
addr = &IPAddr{IP: sa.Addr[0:]}
case *syscall.SockaddrInet6:
addr = &IPAddr{IP: sa.Addr[0:], Zone: zoneCache.name(int(sa.ZoneId))}
}
return
}
func (c *IPConn) writeTo(b []byte, addr *IPAddr) (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 *IPConn) writeMsg(b, oob []byte, addr *IPAddr) (n, oobn int, err error) {
if c.fd.isConnected {
return 0, 0, ErrWriteToConnected
}
if 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) dialIP(ctx context.Context, laddr, raddr *IPAddr) (*IPConn, error) {
network, proto, err := parseNetwork(ctx, sd.network, true)
if err != nil {
return nil, err
}
switch network {
case "ip", "ip4", "ip6":
default:
return nil, UnknownNetworkError(sd.network)
}
ctrlCtxFn := sd.Dialer.ControlContext
if ctrlCtxFn == nil && sd.Dialer.Control != nil {
ctrlCtxFn = func(cxt context.Context, network, address string, c syscall.RawConn) error {
return sd.Dialer.Control(network, address, c)
}
}
fd, err := internetSocket(ctx, network, laddr, raddr, syscall.SOCK_RAW, proto, "dial", ctrlCtxFn)
if err != nil {
return nil, err
}
return newIPConn(fd), nil
}
func (sl *sysListener) listenIP(ctx context.Context, laddr *IPAddr) (*IPConn, error) {
network, proto, err := parseNetwork(ctx, sl.network, true)
if err != nil {
return nil, err
}
switch network {
case "ip", "ip4", "ip6":
default:
return nil, UnknownNetworkError(sl.network)
}
var ctrlCtxFn func(cxt context.Context, network, address string, c syscall.RawConn) error
if sl.ListenConfig.Control != nil {
ctrlCtxFn = func(cxt context.Context, network, address string, c syscall.RawConn) error {
return sl.ListenConfig.Control(network, address, c)
}
}
fd, err := internetSocket(ctx, network, laddr, nil, syscall.SOCK_RAW, proto, "listen", ctrlCtxFn)
if err != nil {
return nil, err
}
return newIPConn(fd), nil
}
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