/go/src/pkg/net/ipsock_plan9.go
Go | 305 lines | 258 code | 30 blank | 17 comment | 75 complexity | f6d26a9f2313133ec8efc48cf3a9dc3e MD5 | raw file
Possible License(s): BSD-3-Clause
- // 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.
- // IP sockets stubs for Plan 9
- package net
- import (
- "os"
- )
- // probeIPv6Stack returns two boolean values. If the first boolean value is
- // true, kernel supports basic IPv6 functionality. If the second
- // boolean value is true, kernel supports IPv6 IPv4-mapping.
- func probeIPv6Stack() (supportsIPv6, supportsIPv4map bool) {
- return false, false
- }
- // parsePlan9Addr parses address of the form [ip!]port (e.g. 127.0.0.1!80).
- func parsePlan9Addr(s string) (ip IP, iport int, err os.Error) {
- var (
- addr IP
- p, i int
- ok bool
- )
- addr = IPv4zero // address contains port only
- i = byteIndex(s, '!')
- if i >= 0 {
- addr = ParseIP(s[:i])
- if addr == nil {
- err = os.NewError("net: parsing IP failed")
- goto Error
- }
- }
- p, _, ok = dtoi(s[i+1:], 0)
- if !ok {
- err = os.NewError("net: parsing port failed")
- goto Error
- }
- if p < 0 || p > 0xFFFF {
- err = &AddrError{"invalid port", string(p)}
- goto Error
- }
- return addr, p, nil
- Error:
- return nil, 0, err
- }
- func readPlan9Addr(proto, filename string) (addr Addr, err os.Error) {
- var buf [128]byte
- f, err := os.Open(filename)
- if err != nil {
- return
- }
- n, err := f.Read(buf[:])
- if err != nil {
- return
- }
- ip, port, err := parsePlan9Addr(string(buf[:n]))
- if err != nil {
- return
- }
- switch proto {
- case "tcp":
- addr = &TCPAddr{ip, port}
- case "udp":
- addr = &UDPAddr{ip, port}
- default:
- return nil, os.NewError("unknown protocol " + proto)
- }
- return addr, nil
- }
- type plan9Conn struct {
- proto, name, dir string
- ctl, data *os.File
- laddr, raddr Addr
- }
- func newPlan9Conn(proto, name string, ctl *os.File, laddr, raddr Addr) *plan9Conn {
- return &plan9Conn{proto, name, "/net/" + proto + "/" + name, ctl, nil, laddr, raddr}
- }
- func (c *plan9Conn) ok() bool { return c != nil && c.ctl != nil }
- // Implementation of the Conn interface - see Conn for documentation.
- // Read implements the net.Conn Read method.
- func (c *plan9Conn) Read(b []byte) (n int, err os.Error) {
- if !c.ok() {
- return 0, os.EINVAL
- }
- if c.data == nil {
- c.data, err = os.OpenFile(c.dir+"/data", os.O_RDWR, 0)
- if err != nil {
- return 0, err
- }
- }
- n, err = c.data.Read(b)
- if c.proto == "udp" && err == os.EOF {
- n = 0
- err = nil
- }
- return
- }
- // Write implements the net.Conn Write method.
- func (c *plan9Conn) Write(b []byte) (n int, err os.Error) {
- if !c.ok() {
- return 0, os.EINVAL
- }
- if c.data == nil {
- c.data, err = os.OpenFile(c.dir+"/data", os.O_RDWR, 0)
- if err != nil {
- return 0, err
- }
- }
- return c.data.Write(b)
- }
- // Close closes the connection.
- func (c *plan9Conn) Close() os.Error {
- if !c.ok() {
- return os.EINVAL
- }
- err := c.ctl.Close()
- if err != nil {
- return err
- }
- if c.data != nil {
- err = c.data.Close()
- }
- c.ctl = nil
- c.data = nil
- return err
- }
- // LocalAddr returns the local network address.
- func (c *plan9Conn) LocalAddr() Addr {
- if !c.ok() {
- return nil
- }
- return c.laddr
- }
- // RemoteAddr returns the remote network address.
- func (c *plan9Conn) RemoteAddr() Addr {
- if !c.ok() {
- return nil
- }
- return c.raddr
- }
- // SetTimeout implements the net.Conn SetTimeout method.
- func (c *plan9Conn) SetTimeout(nsec int64) os.Error {
- if !c.ok() {
- return os.EINVAL
- }
- return os.EPLAN9
- }
- // SetReadTimeout implements the net.Conn SetReadTimeout method.
- func (c *plan9Conn) SetReadTimeout(nsec int64) os.Error {
- if !c.ok() {
- return os.EINVAL
- }
- return os.EPLAN9
- }
- // SetWriteTimeout implements the net.Conn SetWriteTimeout method.
- func (c *plan9Conn) SetWriteTimeout(nsec int64) os.Error {
- if !c.ok() {
- return os.EINVAL
- }
- return os.EPLAN9
- }
- func startPlan9(net string, addr Addr) (ctl *os.File, dest, proto, name string, err os.Error) {
- var (
- ip IP
- port int
- )
- switch a := addr.(type) {
- case *TCPAddr:
- proto = "tcp"
- ip = a.IP
- port = a.Port
- case *UDPAddr:
- proto = "udp"
- ip = a.IP
- port = a.Port
- default:
- err = UnknownNetworkError(net)
- return
- }
- clone, dest, err := queryCS1(proto, ip, port)
- if err != nil {
- return
- }
- f, err := os.OpenFile(clone, os.O_RDWR, 0)
- if err != nil {
- return
- }
- var buf [16]byte
- n, err := f.Read(buf[:])
- if err != nil {
- return
- }
- return f, dest, proto, string(buf[:n]), nil
- }
- func dialPlan9(net string, laddr, raddr Addr) (c *plan9Conn, err os.Error) {
- f, dest, proto, name, err := startPlan9(net, raddr)
- if err != nil {
- return
- }
- _, err = f.WriteString("connect " + dest)
- if err != nil {
- return
- }
- laddr, err = readPlan9Addr(proto, "/net/"+proto+"/"+name+"/local")
- if err != nil {
- return
- }
- raddr, err = readPlan9Addr(proto, "/net/"+proto+"/"+name+"/remote")
- if err != nil {
- return
- }
- return newPlan9Conn(proto, name, f, laddr, raddr), nil
- }
- type plan9Listener struct {
- proto, name, dir string
- ctl *os.File
- laddr Addr
- }
- func listenPlan9(net string, laddr Addr) (l *plan9Listener, err os.Error) {
- f, dest, proto, name, err := startPlan9(net, laddr)
- if err != nil {
- return
- }
- _, err = f.WriteString("announce " + dest)
- if err != nil {
- return
- }
- laddr, err = readPlan9Addr(proto, "/net/"+proto+"/"+name+"/local")
- if err != nil {
- return
- }
- l = new(plan9Listener)
- l.proto = proto
- l.name = name
- l.dir = "/net/" + proto + "/" + name
- l.ctl = f
- l.laddr = laddr
- return l, nil
- }
- func (l *plan9Listener) plan9Conn() *plan9Conn {
- return newPlan9Conn(l.proto, l.name, l.ctl, l.laddr, nil)
- }
- func (l *plan9Listener) acceptPlan9() (c *plan9Conn, err os.Error) {
- f, err := os.Open(l.dir + "/listen")
- if err != nil {
- return
- }
- var buf [16]byte
- n, err := f.Read(buf[:])
- if err != nil {
- return
- }
- name := string(buf[:n])
- laddr, err := readPlan9Addr(l.proto, l.dir+"/local")
- if err != nil {
- return
- }
- raddr, err := readPlan9Addr(l.proto, l.dir+"/remote")
- if err != nil {
- return
- }
- return newPlan9Conn(l.proto, name, f, laddr, raddr), nil
- }
- func (l *plan9Listener) Accept() (c Conn, err os.Error) {
- c1, err := l.acceptPlan9()
- if err != nil {
- return
- }
- return c1, nil
- }
- func (l *plan9Listener) Close() os.Error {
- if l == nil || l.ctl == nil {
- return os.EINVAL
- }
- return l.ctl.Close()
- }
- func (l *plan9Listener) Addr() Addr { return l.laddr }