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353 lines
10 KiB
Go
353 lines
10 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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package net
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import (
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"context"
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"os"
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"sync"
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"syscall"
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"time"
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)
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// BUG(mikio): On JS and Plan 9, methods and functions related
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// to UnixConn and UnixListener are not implemented.
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// BUG(mikio): On Windows, methods and functions related to UnixConn
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// and UnixListener don't work for "unixgram" and "unixpacket".
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// UnixAddr represents the address of a Unix domain socket end point.
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type UnixAddr struct {
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Name string
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Net string
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}
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// Network returns the address's network name, "unix", "unixgram" or
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// "unixpacket".
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func (a *UnixAddr) Network() string {
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return a.Net
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}
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func (a *UnixAddr) String() string {
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if a == nil {
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return "<nil>"
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}
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return a.Name
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}
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func (a *UnixAddr) isWildcard() bool {
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return a == nil || a.Name == ""
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}
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func (a *UnixAddr) opAddr() Addr {
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if a == nil {
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return nil
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}
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return a
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}
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// ResolveUnixAddr returns an address of Unix domain socket end point.
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//
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// The network must be a Unix network name.
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//
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// See func Dial for a description of the network and address
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// parameters.
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func ResolveUnixAddr(network, address string) (*UnixAddr, error) {
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switch network {
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case "unix", "unixgram", "unixpacket":
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return &UnixAddr{Name: address, Net: network}, nil
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default:
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return nil, UnknownNetworkError(network)
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}
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}
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// UnixConn is an implementation of the Conn interface for connections
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// to Unix domain sockets.
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type UnixConn struct {
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conn
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}
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// SyscallConn returns a raw network connection.
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// This implements the syscall.Conn interface.
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func (c *UnixConn) SyscallConn() (syscall.RawConn, error) {
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if !c.ok() {
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return nil, syscall.EINVAL
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}
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return newRawConn(c.fd)
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}
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// CloseRead shuts down the reading side of the Unix domain connection.
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// Most callers should just use Close.
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func (c *UnixConn) CloseRead() error {
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if !c.ok() {
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return syscall.EINVAL
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}
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if err := c.fd.closeRead(); err != nil {
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return &OpError{Op: "close", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
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}
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return nil
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}
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// CloseWrite shuts down the writing side of the Unix domain connection.
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// Most callers should just use Close.
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func (c *UnixConn) CloseWrite() error {
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if !c.ok() {
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return syscall.EINVAL
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}
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if err := c.fd.closeWrite(); err != nil {
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return &OpError{Op: "close", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
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}
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return nil
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}
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// ReadFromUnix acts like ReadFrom but returns a UnixAddr.
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func (c *UnixConn) ReadFromUnix(b []byte) (int, *UnixAddr, error) {
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if !c.ok() {
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return 0, nil, syscall.EINVAL
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}
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n, addr, err := c.readFrom(b)
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if err != nil {
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err = &OpError{Op: "read", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
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}
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return n, addr, err
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}
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// ReadFrom implements the PacketConn ReadFrom method.
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func (c *UnixConn) ReadFrom(b []byte) (int, Addr, error) {
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if !c.ok() {
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return 0, nil, syscall.EINVAL
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}
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n, addr, err := c.readFrom(b)
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if err != nil {
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err = &OpError{Op: "read", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
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}
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if addr == nil {
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return n, nil, err
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}
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return n, addr, err
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}
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// ReadMsgUnix reads a message from c, copying the payload into b and
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// the associated out-of-band data into oob. It returns the number of
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// bytes copied into b, the number of bytes copied into oob, the flags
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// that were set on the message and the source address of the message.
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//
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// Note that if len(b) == 0 and len(oob) > 0, this function will still
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// read (and discard) 1 byte from the connection.
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func (c *UnixConn) ReadMsgUnix(b, oob []byte) (n, oobn, flags int, addr *UnixAddr, err error) {
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if !c.ok() {
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return 0, 0, 0, nil, syscall.EINVAL
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}
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n, oobn, flags, addr, err = c.readMsg(b, oob)
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if err != nil {
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err = &OpError{Op: "read", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
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}
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return
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}
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// WriteToUnix acts like WriteTo but takes a UnixAddr.
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func (c *UnixConn) WriteToUnix(b []byte, addr *UnixAddr) (int, error) {
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if !c.ok() {
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return 0, syscall.EINVAL
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}
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n, err := c.writeTo(b, addr)
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if err != nil {
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err = &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addr.opAddr(), Err: err}
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}
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return n, err
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}
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// WriteTo implements the PacketConn WriteTo method.
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func (c *UnixConn) WriteTo(b []byte, addr Addr) (int, error) {
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if !c.ok() {
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return 0, syscall.EINVAL
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}
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a, ok := addr.(*UnixAddr)
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if !ok {
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return 0, &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addr, Err: syscall.EINVAL}
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}
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n, err := c.writeTo(b, a)
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if err != nil {
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err = &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: a.opAddr(), Err: err}
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}
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return n, err
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}
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// WriteMsgUnix writes a message to addr via c, copying the payload
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// from b and the associated out-of-band data from oob. It returns the
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// number of payload and out-of-band bytes written.
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//
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// Note that if len(b) == 0 and len(oob) > 0, this function will still
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// write 1 byte to the connection.
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func (c *UnixConn) WriteMsgUnix(b, oob []byte, addr *UnixAddr) (n, oobn int, err error) {
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if !c.ok() {
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return 0, 0, syscall.EINVAL
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}
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n, oobn, err = c.writeMsg(b, oob, addr)
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if err != nil {
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err = &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addr.opAddr(), Err: err}
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}
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return
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}
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func newUnixConn(fd *netFD) *UnixConn { return &UnixConn{conn{fd}} }
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// DialUnix acts like Dial for Unix networks.
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//
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// The network must be a Unix network name; see func Dial for details.
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//
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// If laddr is non-nil, it is used as the local address for the
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// connection.
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func DialUnix(network string, laddr, raddr *UnixAddr) (*UnixConn, error) {
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switch network {
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case "unix", "unixgram", "unixpacket":
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default:
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return nil, &OpError{Op: "dial", Net: network, Source: laddr.opAddr(), Addr: raddr.opAddr(), Err: UnknownNetworkError(network)}
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}
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sd := &sysDialer{network: network, address: raddr.String()}
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c, err := sd.dialUnix(context.Background(), laddr, raddr)
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if err != nil {
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return nil, &OpError{Op: "dial", Net: network, Source: laddr.opAddr(), Addr: raddr.opAddr(), Err: err}
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}
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return c, nil
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}
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// UnixListener is a Unix domain socket listener. Clients should
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// typically use variables of type Listener instead of assuming Unix
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// domain sockets.
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type UnixListener struct {
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fd *netFD
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path string
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unlink bool
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unlinkOnce sync.Once
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}
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func (ln *UnixListener) ok() bool { return ln != nil && ln.fd != nil }
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// SyscallConn returns a raw network connection.
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// This implements the syscall.Conn interface.
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//
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// The returned RawConn only supports calling Control. Read and
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// Write return an error.
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func (l *UnixListener) SyscallConn() (syscall.RawConn, error) {
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if !l.ok() {
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return nil, syscall.EINVAL
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}
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return newRawListener(l.fd)
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}
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// AcceptUnix accepts the next incoming call and returns the new
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// connection.
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func (l *UnixListener) AcceptUnix() (*UnixConn, error) {
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if !l.ok() {
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return nil, syscall.EINVAL
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}
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c, err := l.accept()
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if err != nil {
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return nil, &OpError{Op: "accept", Net: l.fd.net, Source: nil, Addr: l.fd.laddr, Err: err}
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}
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return c, nil
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}
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// Accept implements the Accept method in the Listener interface.
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// Returned connections will be of type *UnixConn.
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func (l *UnixListener) Accept() (Conn, error) {
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if !l.ok() {
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return nil, syscall.EINVAL
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}
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c, err := l.accept()
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if err != nil {
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return nil, &OpError{Op: "accept", Net: l.fd.net, Source: nil, Addr: l.fd.laddr, Err: err}
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}
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return c, nil
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}
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// Close stops listening on the Unix address. Already accepted
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// connections are not closed.
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func (l *UnixListener) Close() error {
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if !l.ok() {
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return syscall.EINVAL
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}
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if err := l.close(); err != nil {
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return &OpError{Op: "close", Net: l.fd.net, Source: nil, Addr: l.fd.laddr, Err: err}
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}
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return nil
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}
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// Addr returns the listener's network address.
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// The Addr returned is shared by all invocations of Addr, so
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// do not modify it.
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func (l *UnixListener) Addr() Addr { return l.fd.laddr }
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// SetDeadline sets the deadline associated with the listener.
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// A zero time value disables the deadline.
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func (l *UnixListener) SetDeadline(t time.Time) error {
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if !l.ok() {
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return syscall.EINVAL
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}
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if err := l.fd.pfd.SetDeadline(t); err != nil {
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return &OpError{Op: "set", Net: l.fd.net, Source: nil, Addr: l.fd.laddr, Err: err}
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}
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return nil
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}
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// File returns a copy of the underlying os.File.
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// It is the caller's responsibility to close f when finished.
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// Closing l does not affect f, and closing f does not affect l.
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//
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// The returned os.File's file descriptor is different from the
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// connection's. Attempting to change properties of the original
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// using this duplicate may or may not have the desired effect.
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func (l *UnixListener) File() (f *os.File, err error) {
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if !l.ok() {
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return nil, syscall.EINVAL
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}
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f, err = l.file()
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if err != nil {
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err = &OpError{Op: "file", Net: l.fd.net, Source: nil, Addr: l.fd.laddr, Err: err}
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}
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return
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}
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// ListenUnix acts like Listen for Unix networks.
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//
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// The network must be "unix" or "unixpacket".
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func ListenUnix(network string, laddr *UnixAddr) (*UnixListener, error) {
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switch network {
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case "unix", "unixpacket":
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default:
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return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: laddr.opAddr(), Err: UnknownNetworkError(network)}
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}
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if laddr == nil {
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return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: laddr.opAddr(), Err: errMissingAddress}
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}
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sl := &sysListener{network: network, address: laddr.String()}
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ln, err := sl.listenUnix(context.Background(), laddr)
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if err != nil {
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return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: laddr.opAddr(), Err: err}
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}
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return ln, nil
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}
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// ListenUnixgram acts like ListenPacket for Unix networks.
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//
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// The network must be "unixgram".
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func ListenUnixgram(network string, laddr *UnixAddr) (*UnixConn, error) {
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switch network {
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case "unixgram":
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default:
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return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: laddr.opAddr(), Err: UnknownNetworkError(network)}
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}
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if laddr == nil {
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return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: nil, Err: errMissingAddress}
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}
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sl := &sysListener{network: network, address: laddr.String()}
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c, err := sl.listenUnixgram(context.Background(), laddr)
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if err != nil {
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return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: laddr.opAddr(), Err: err}
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}
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return c, nil
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}
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