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// 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.
//go:build unix || (js && wasm) || windows
package net
import (
"context"
"errors"
"os"
"syscall"
)
func unixSocket(ctx context.Context, net string, laddr, raddr sockaddr, mode string, ctxCtrlFn func(context.Context, string, string, syscall.RawConn) error) (*netFD, error) {
var sotype int
switch net {
case "unix":
sotype = syscall.SOCK_STREAM
case "unixgram":
sotype = syscall.SOCK_DGRAM
case "unixpacket":
sotype = syscall.SOCK_SEQPACKET
default:
return nil, UnknownNetworkError(net)
}
switch mode {
case "dial":
if laddr != nil && laddr.isWildcard() {
laddr = nil
}
if raddr != nil && raddr.isWildcard() {
raddr = nil
}
if raddr == nil && (sotype != syscall.SOCK_DGRAM || laddr == nil) {
return nil, errMissingAddress
}
case "listen":
default:
return nil, errors.New("unknown mode: " + mode)
}
fd, err := socket(ctx, net, syscall.AF_UNIX, sotype, 0, false, laddr, raddr, ctxCtrlFn)
if err != nil {
return nil, err
}
return fd, nil
}
func sockaddrToUnix(sa syscall.Sockaddr) Addr {
if s, ok := sa.(*syscall.SockaddrUnix); ok {
return &UnixAddr{Name: s.Name, Net: "unix"}
}
return nil
}
func sockaddrToUnixgram(sa syscall.Sockaddr) Addr {
if s, ok := sa.(*syscall.SockaddrUnix); ok {
return &UnixAddr{Name: s.Name, Net: "unixgram"}
}
return nil
}
func sockaddrToUnixpacket(sa syscall.Sockaddr) Addr {
if s, ok := sa.(*syscall.SockaddrUnix); ok {
return &UnixAddr{Name: s.Name, Net: "unixpacket"}
}
return nil
}
func sotypeToNet(sotype int) string {
switch sotype {
case syscall.SOCK_STREAM:
return "unix"
case syscall.SOCK_DGRAM:
return "unixgram"
case syscall.SOCK_SEQPACKET:
return "unixpacket"
default:
panic("sotypeToNet unknown socket type")
}
}
func (a *UnixAddr) family() int {
return syscall.AF_UNIX
}
func (a *UnixAddr) sockaddr(family int) (syscall.Sockaddr, error) {
if a == nil {
return nil, nil
}
return &syscall.SockaddrUnix{Name: a.Name}, nil
}
func (a *UnixAddr) toLocal(net string) sockaddr {
return a
}
func (c *UnixConn) readFrom(b []byte) (int, *UnixAddr, error) {
var addr *UnixAddr
n, sa, err := c.fd.readFrom(b)
switch sa := sa.(type) {
case *syscall.SockaddrUnix:
if sa.Name != "" {
addr = &UnixAddr{Name: sa.Name, Net: sotypeToNet(c.fd.sotype)}
}
}
return n, addr, err
}
func (c *UnixConn) readMsg(b, oob []byte) (n, oobn, flags int, addr *UnixAddr, err error) {
var sa syscall.Sockaddr
n, oobn, flags, sa, err = c.fd.readMsg(b, oob, readMsgFlags)
if readMsgFlags == 0 && err == nil && oobn > 0 {
setReadMsgCloseOnExec(oob[:oobn])
}
switch sa := sa.(type) {
case *syscall.SockaddrUnix:
if sa.Name != "" {
addr = &UnixAddr{Name: sa.Name, Net: sotypeToNet(c.fd.sotype)}
}
}
return
}
func (c *UnixConn) writeTo(b []byte, addr *UnixAddr) (int, error) {
if c.fd.isConnected {
return 0, ErrWriteToConnected
}
if addr == nil {
return 0, errMissingAddress
}
if addr.Net != sotypeToNet(c.fd.sotype) {
return 0, syscall.EAFNOSUPPORT
}
sa := &syscall.SockaddrUnix{Name: addr.Name}
return c.fd.writeTo(b, sa)
}
func (c *UnixConn) writeMsg(b, oob []byte, addr *UnixAddr) (n, oobn int, err error) {
if c.fd.sotype == syscall.SOCK_DGRAM && c.fd.isConnected {
return 0, 0, ErrWriteToConnected
}
var sa syscall.Sockaddr
if addr != nil {
if addr.Net != sotypeToNet(c.fd.sotype) {
return 0, 0, syscall.EAFNOSUPPORT
}
sa = &syscall.SockaddrUnix{Name: addr.Name}
}
return c.fd.writeMsg(b, oob, sa)
}
func (sd *sysDialer) dialUnix(ctx context.Context, laddr, raddr *UnixAddr) (*UnixConn, error) {
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 := unixSocket(ctx, sd.network, laddr, raddr, "dial", ctrlCtxFn)
if err != nil {
return nil, err
}
return newUnixConn(fd), nil
}
func (ln *UnixListener) accept() (*UnixConn, error) {
fd, err := ln.fd.accept()
if err != nil {
return nil, err
}
return newUnixConn(fd), nil
}
func (ln *UnixListener) close() error {
// The operating system doesn't clean up
// the file that announcing created, so
// we have to clean it up ourselves.
// There's a race here--we can't know for
// sure whether someone else has come along
// and replaced our socket name already--
// but this sequence (remove then close)
// is at least compatible with the auto-remove
// sequence in ListenUnix. It's only non-Go
// programs that can mess us up.
// Even if there are racy calls to Close, we want to unlink only for the first one.
ln.unlinkOnce.Do(func() {
if ln.path[0] != '@' && ln.unlink {
syscall.Unlink(ln.path)
}
})
return ln.fd.Close()
}
func (ln *UnixListener) file() (*os.File, error) {
f, err := ln.fd.dup()
if err != nil {
return nil, err
}
return f, nil
}
// SetUnlinkOnClose sets whether the underlying socket file should be removed
// from the file system when the listener is closed.
//
// The default behavior is to unlink the socket file only when package net created it.
// That is, when the listener and the underlying socket file were created by a call to
// Listen or ListenUnix, then by default closing the listener will remove the socket file.
// but if the listener was created by a call to FileListener to use an already existing
// socket file, then by default closing the listener will not remove the socket file.
func (l *UnixListener) SetUnlinkOnClose(unlink bool) {
l.unlink = unlink
}
func (sl *sysListener) listenUnix(ctx context.Context, laddr *UnixAddr) (*UnixListener, error) {
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 := unixSocket(ctx, sl.network, laddr, nil, "listen", ctrlCtxFn)
if err != nil {
return nil, err
}
return &UnixListener{fd: fd, path: fd.laddr.String(), unlink: true}, nil
}
func (sl *sysListener) listenUnixgram(ctx context.Context, laddr *UnixAddr) (*UnixConn, error) {
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 := unixSocket(ctx, sl.network, laddr, nil, "listen", ctrlCtxFn)
if err != nil {
return nil, err
}
return newUnixConn(fd), nil
}
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