1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
// 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
}
|
