be47d6ecef
From-SVN: r200974
194 lines
4.5 KiB
Go
194 lines
4.5 KiB
Go
// 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.
|
|
|
|
// Internet protocol family sockets for Plan 9
|
|
|
|
package net
|
|
|
|
import (
|
|
"errors"
|
|
"os"
|
|
"syscall"
|
|
)
|
|
|
|
// /sys/include/ape/sys/socket.h:/SOMAXCONN
|
|
var listenerBacklog = 5
|
|
|
|
// 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 error) {
|
|
addr := IPv4zero // address contains port only
|
|
i := byteIndex(s, '!')
|
|
if i >= 0 {
|
|
addr = ParseIP(s[:i])
|
|
if addr == nil {
|
|
return nil, 0, errors.New("net: parsing IP failed")
|
|
}
|
|
}
|
|
p, _, ok := dtoi(s[i+1:], 0)
|
|
if !ok {
|
|
return nil, 0, errors.New("net: parsing port failed")
|
|
}
|
|
if p < 0 || p > 0xFFFF {
|
|
return nil, 0, &AddrError{"invalid port", string(p)}
|
|
}
|
|
return addr, p, nil
|
|
}
|
|
|
|
func readPlan9Addr(proto, filename string) (addr Addr, err error) {
|
|
var buf [128]byte
|
|
|
|
f, err := os.Open(filename)
|
|
if err != nil {
|
|
return
|
|
}
|
|
defer f.Close()
|
|
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: ip, Port: port}
|
|
case "udp":
|
|
addr = &UDPAddr{IP: ip, Port: port}
|
|
default:
|
|
return nil, errors.New("unknown protocol " + proto)
|
|
}
|
|
return addr, nil
|
|
}
|
|
|
|
func startPlan9(net string, addr Addr) (ctl *os.File, dest, proto, name string, err 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 {
|
|
f.Close()
|
|
return
|
|
}
|
|
return f, dest, proto, string(buf[:n]), nil
|
|
}
|
|
|
|
func netErr(e error) {
|
|
oe, ok := e.(*OpError)
|
|
if !ok {
|
|
return
|
|
}
|
|
if pe, ok := oe.Err.(*os.PathError); ok {
|
|
if _, ok = pe.Err.(syscall.ErrorString); ok {
|
|
oe.Err = pe.Err
|
|
}
|
|
}
|
|
}
|
|
|
|
func dialPlan9(net string, laddr, raddr Addr) (fd *netFD, err error) {
|
|
defer func() { netErr(err) }()
|
|
f, dest, proto, name, err := startPlan9(net, raddr)
|
|
if err != nil {
|
|
return nil, &OpError{"dial", net, raddr, err}
|
|
}
|
|
_, err = f.WriteString("connect " + dest)
|
|
if err != nil {
|
|
f.Close()
|
|
return nil, &OpError{"dial", f.Name(), raddr, err}
|
|
}
|
|
data, err := os.OpenFile("/net/"+proto+"/"+name+"/data", os.O_RDWR, 0)
|
|
if err != nil {
|
|
f.Close()
|
|
return nil, &OpError{"dial", net, raddr, err}
|
|
}
|
|
laddr, err = readPlan9Addr(proto, "/net/"+proto+"/"+name+"/local")
|
|
if err != nil {
|
|
data.Close()
|
|
f.Close()
|
|
return nil, &OpError{"dial", proto, raddr, err}
|
|
}
|
|
return newFD(proto, name, f, data, laddr, raddr), nil
|
|
}
|
|
|
|
func listenPlan9(net string, laddr Addr) (fd *netFD, err error) {
|
|
defer func() { netErr(err) }()
|
|
f, dest, proto, name, err := startPlan9(net, laddr)
|
|
if err != nil {
|
|
return nil, &OpError{"listen", net, laddr, err}
|
|
}
|
|
_, err = f.WriteString("announce " + dest)
|
|
if err != nil {
|
|
f.Close()
|
|
return nil, &OpError{"announce", proto, laddr, err}
|
|
}
|
|
laddr, err = readPlan9Addr(proto, "/net/"+proto+"/"+name+"/local")
|
|
if err != nil {
|
|
f.Close()
|
|
return nil, &OpError{Op: "listen", Net: net, Err: err}
|
|
}
|
|
return newFD(proto, name, f, nil, laddr, nil), nil
|
|
}
|
|
|
|
func (l *netFD) netFD() *netFD {
|
|
return newFD(l.proto, l.name, l.ctl, l.data, l.laddr, l.raddr)
|
|
}
|
|
|
|
func (l *netFD) acceptPlan9() (fd *netFD, err error) {
|
|
defer func() { netErr(err) }()
|
|
f, err := os.Open(l.dir + "/listen")
|
|
if err != nil {
|
|
return nil, &OpError{"accept", l.dir + "/listen", l.laddr, err}
|
|
}
|
|
var buf [16]byte
|
|
n, err := f.Read(buf[:])
|
|
if err != nil {
|
|
f.Close()
|
|
return nil, &OpError{"accept", l.dir + "/listen", l.laddr, err}
|
|
}
|
|
name := string(buf[:n])
|
|
data, err := os.OpenFile("/net/"+l.proto+"/"+name+"/data", os.O_RDWR, 0)
|
|
if err != nil {
|
|
f.Close()
|
|
return nil, &OpError{"accept", l.proto, l.laddr, err}
|
|
}
|
|
raddr, err := readPlan9Addr(l.proto, "/net/"+l.proto+"/"+name+"/remote")
|
|
if err != nil {
|
|
data.Close()
|
|
f.Close()
|
|
return nil, &OpError{"accept", l.proto, l.laddr, err}
|
|
}
|
|
return newFD(l.proto, name, f, data, l.laddr, raddr), nil
|
|
}
|