306 lines
6.1 KiB
Go
306 lines
6.1 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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// IP sockets stubs for Plan 9
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package net
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import (
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"os"
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)
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// probeIPv6Stack returns two boolean values. If the first boolean value is
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// true, kernel supports basic IPv6 functionality. If the second
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// boolean value is true, kernel supports IPv6 IPv4-mapping.
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func probeIPv6Stack() (supportsIPv6, supportsIPv4map bool) {
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return false, false
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}
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// parsePlan9Addr parses address of the form [ip!]port (e.g. 127.0.0.1!80).
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func parsePlan9Addr(s string) (ip IP, iport int, err os.Error) {
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var (
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addr IP
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p, i int
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ok bool
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)
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addr = IPv4zero // address contains port only
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i = byteIndex(s, '!')
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if i >= 0 {
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addr = ParseIP(s[:i])
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if addr == nil {
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err = os.NewError("net: parsing IP failed")
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goto Error
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}
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}
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p, _, ok = dtoi(s[i+1:], 0)
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if !ok {
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err = os.NewError("net: parsing port failed")
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goto Error
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}
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if p < 0 || p > 0xFFFF {
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err = &AddrError{"invalid port", string(p)}
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goto Error
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}
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return addr, p, nil
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Error:
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return nil, 0, err
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}
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func readPlan9Addr(proto, filename string) (addr Addr, err os.Error) {
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var buf [128]byte
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f, err := os.Open(filename)
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if err != nil {
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return
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}
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n, err := f.Read(buf[:])
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if err != nil {
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return
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}
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ip, port, err := parsePlan9Addr(string(buf[:n]))
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if err != nil {
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return
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}
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switch proto {
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case "tcp":
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addr = &TCPAddr{ip, port}
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case "udp":
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addr = &UDPAddr{ip, port}
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default:
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return nil, os.NewError("unknown protocol " + proto)
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}
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return addr, nil
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}
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type plan9Conn struct {
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proto, name, dir string
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ctl, data *os.File
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laddr, raddr Addr
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}
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func newPlan9Conn(proto, name string, ctl *os.File, laddr, raddr Addr) *plan9Conn {
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return &plan9Conn{proto, name, "/net/" + proto + "/" + name, ctl, nil, laddr, raddr}
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}
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func (c *plan9Conn) ok() bool { return c != nil && c.ctl != nil }
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// Implementation of the Conn interface - see Conn for documentation.
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// Read implements the net.Conn Read method.
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func (c *plan9Conn) Read(b []byte) (n int, err os.Error) {
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if !c.ok() {
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return 0, os.EINVAL
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}
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if c.data == nil {
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c.data, err = os.OpenFile(c.dir+"/data", os.O_RDWR, 0)
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if err != nil {
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return 0, err
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}
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}
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n, err = c.data.Read(b)
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if c.proto == "udp" && err == os.EOF {
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n = 0
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err = nil
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}
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return
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}
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// Write implements the net.Conn Write method.
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func (c *plan9Conn) Write(b []byte) (n int, err os.Error) {
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if !c.ok() {
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return 0, os.EINVAL
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}
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if c.data == nil {
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c.data, err = os.OpenFile(c.dir+"/data", os.O_RDWR, 0)
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if err != nil {
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return 0, err
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}
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}
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return c.data.Write(b)
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}
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// Close closes the connection.
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func (c *plan9Conn) Close() os.Error {
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if !c.ok() {
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return os.EINVAL
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}
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err := c.ctl.Close()
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if err != nil {
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return err
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}
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if c.data != nil {
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err = c.data.Close()
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}
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c.ctl = nil
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c.data = nil
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return err
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}
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// LocalAddr returns the local network address.
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func (c *plan9Conn) LocalAddr() Addr {
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if !c.ok() {
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return nil
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}
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return c.laddr
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}
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// RemoteAddr returns the remote network address.
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func (c *plan9Conn) RemoteAddr() Addr {
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if !c.ok() {
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return nil
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}
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return c.raddr
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}
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// SetTimeout implements the net.Conn SetTimeout method.
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func (c *plan9Conn) SetTimeout(nsec int64) os.Error {
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if !c.ok() {
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return os.EINVAL
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}
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return os.EPLAN9
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}
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// SetReadTimeout implements the net.Conn SetReadTimeout method.
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func (c *plan9Conn) SetReadTimeout(nsec int64) os.Error {
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if !c.ok() {
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return os.EINVAL
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}
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return os.EPLAN9
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}
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// SetWriteTimeout implements the net.Conn SetWriteTimeout method.
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func (c *plan9Conn) SetWriteTimeout(nsec int64) os.Error {
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if !c.ok() {
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return os.EINVAL
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}
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return os.EPLAN9
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}
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func startPlan9(net string, addr Addr) (ctl *os.File, dest, proto, name string, err os.Error) {
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var (
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ip IP
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port int
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)
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switch a := addr.(type) {
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case *TCPAddr:
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proto = "tcp"
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ip = a.IP
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port = a.Port
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case *UDPAddr:
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proto = "udp"
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ip = a.IP
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port = a.Port
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default:
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err = UnknownNetworkError(net)
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return
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}
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clone, dest, err := queryCS1(proto, ip, port)
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if err != nil {
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return
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}
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f, err := os.OpenFile(clone, os.O_RDWR, 0)
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if err != nil {
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return
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}
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var buf [16]byte
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n, err := f.Read(buf[:])
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if err != nil {
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return
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}
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return f, dest, proto, string(buf[:n]), nil
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}
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func dialPlan9(net string, laddr, raddr Addr) (c *plan9Conn, err os.Error) {
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f, dest, proto, name, err := startPlan9(net, raddr)
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if err != nil {
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return
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}
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_, err = f.WriteString("connect " + dest)
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if err != nil {
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return
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}
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laddr, err = readPlan9Addr(proto, "/net/"+proto+"/"+name+"/local")
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if err != nil {
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return
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}
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raddr, err = readPlan9Addr(proto, "/net/"+proto+"/"+name+"/remote")
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if err != nil {
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return
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}
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return newPlan9Conn(proto, name, f, laddr, raddr), nil
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}
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type plan9Listener struct {
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proto, name, dir string
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ctl *os.File
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laddr Addr
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}
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func listenPlan9(net string, laddr Addr) (l *plan9Listener, err os.Error) {
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f, dest, proto, name, err := startPlan9(net, laddr)
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if err != nil {
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return
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}
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_, err = f.WriteString("announce " + dest)
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if err != nil {
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return
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}
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laddr, err = readPlan9Addr(proto, "/net/"+proto+"/"+name+"/local")
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if err != nil {
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return
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}
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l = new(plan9Listener)
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l.proto = proto
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l.name = name
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l.dir = "/net/" + proto + "/" + name
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l.ctl = f
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l.laddr = laddr
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return l, nil
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}
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func (l *plan9Listener) plan9Conn() *plan9Conn {
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return newPlan9Conn(l.proto, l.name, l.ctl, l.laddr, nil)
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}
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func (l *plan9Listener) acceptPlan9() (c *plan9Conn, err os.Error) {
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f, err := os.Open(l.dir + "/listen")
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if err != nil {
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return
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}
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var buf [16]byte
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n, err := f.Read(buf[:])
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if err != nil {
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return
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}
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name := string(buf[:n])
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laddr, err := readPlan9Addr(l.proto, l.dir+"/local")
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if err != nil {
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return
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}
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raddr, err := readPlan9Addr(l.proto, l.dir+"/remote")
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if err != nil {
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return
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}
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return newPlan9Conn(l.proto, name, f, laddr, raddr), nil
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}
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func (l *plan9Listener) Accept() (c Conn, err os.Error) {
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c1, err := l.acceptPlan9()
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if err != nil {
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return
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}
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return c1, nil
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}
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func (l *plan9Listener) Close() os.Error {
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if l == nil || l.ctl == nil {
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return os.EINVAL
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}
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return l.ctl.Close()
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}
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func (l *plan9Listener) Addr() Addr { return l.laddr }
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