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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [net/] [dnsconfig.go] - Blame information for rev 747

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// 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.
 
// +build darwin freebsd linux netbsd openbsd
 
// Read system DNS config from /etc/resolv.conf
 
package net
 
type dnsConfig struct {
        servers  []string // servers to use
        search   []string // suffixes to append to local name
        ndots    int      // number of dots in name to trigger absolute lookup
        timeout  int      // seconds before giving up on packet
        attempts int      // lost packets before giving up on server
        rotate   bool     // round robin among servers
}
 
// See resolv.conf(5) on a Linux machine.
// TODO(rsc): Supposed to call uname() and chop the beginning
// of the host name to get the default search domain.
// We assume it's in resolv.conf anyway.
func dnsReadConfig() (*dnsConfig, error) {
        file, err := open("/etc/resolv.conf")
        if err != nil {
                return nil, &DNSConfigError{err}
        }
        conf := new(dnsConfig)
        conf.servers = make([]string, 3)[0:0] // small, but the standard limit
        conf.search = make([]string, 0)
        conf.ndots = 1
        conf.timeout = 5
        conf.attempts = 2
        conf.rotate = false
        for line, ok := file.readLine(); ok; line, ok = file.readLine() {
                f := getFields(line)
                if len(f) < 1 {
                        continue
                }
                switch f[0] {
                case "nameserver": // add one name server
                        a := conf.servers
                        n := len(a)
                        if len(f) > 1 && n < cap(a) {
                                // One more check: make sure server name is
                                // just an IP address.  Otherwise we need DNS
                                // to look it up.
                                name := f[1]
                                switch len(ParseIP(name)) {
                                case 16:
                                        name = "[" + name + "]"
                                        fallthrough
                                case 4:
                                        a = a[0 : n+1]
                                        a[n] = name
                                        conf.servers = a
                                }
                        }
 
                case "domain": // set search path to just this domain
                        if len(f) > 1 {
                                conf.search = make([]string, 1)
                                conf.search[0] = f[1]
                        } else {
                                conf.search = make([]string, 0)
                        }
 
                case "search": // set search path to given servers
                        conf.search = make([]string, len(f)-1)
                        for i := 0; i < len(conf.search); i++ {
                                conf.search[i] = f[i+1]
                        }
 
                case "options": // magic options
                        for i := 1; i < len(f); i++ {
                                s := f[i]
                                switch {
                                case len(s) >= 6 && s[0:6] == "ndots:":
                                        n, _, _ := dtoi(s, 6)
                                        if n < 1 {
                                                n = 1
                                        }
                                        conf.ndots = n
                                case len(s) >= 8 && s[0:8] == "timeout:":
                                        n, _, _ := dtoi(s, 8)
                                        if n < 1 {
                                                n = 1
                                        }
                                        conf.timeout = n
                                case len(s) >= 8 && s[0:9] == "attempts:":
                                        n, _, _ := dtoi(s, 9)
                                        if n < 1 {
                                                n = 1
                                        }
                                        conf.attempts = n
                                case s == "rotate":
                                        conf.rotate = true
                                }
                        }
                }
        }
        file.close()
 
        return conf, nil
}

Line No.	Rev	Author	Line
1	747	jeremybenn	`// Copyright 2009 The Go Authors. All rights reserved.`
2			`// Use of this source code is governed by a BSD-style`
3			`// license that can be found in the LICENSE file.`
4
5			`// +build darwin freebsd linux netbsd openbsd`
6
7			`// Read system DNS config from /etc/resolv.conf`
8
9			`package net`
10
11			`type dnsConfig struct {`
12			`servers []string // servers to use`
13			`search []string // suffixes to append to local name`
14			`ndots int // number of dots in name to trigger absolute lookup`
15			`timeout int // seconds before giving up on packet`
16			`attempts int // lost packets before giving up on server`
17			`rotate bool // round robin among servers`
18			`}`
19
20			`// See resolv.conf(5) on a Linux machine.`
21			`// TODO(rsc): Supposed to call uname() and chop the beginning`
22			`// of the host name to get the default search domain.`
23			`// We assume it's in resolv.conf anyway.`
24			`func dnsReadConfig() (*dnsConfig, error) {`
25			`file, err := open("/etc/resolv.conf")`
26			`if err != nil {`
27			`return nil, &DNSConfigError{err}`
28			`}`
29			`conf := new(dnsConfig)`
30			`conf.servers = make([]string, 3)[0:0] // small, but the standard limit`
31			`conf.search = make([]string, 0)`
32			`conf.ndots = 1`
33			`conf.timeout = 5`
34			`conf.attempts = 2`
35			`conf.rotate = false`
36			`for line, ok := file.readLine(); ok; line, ok = file.readLine() {`
37			`f := getFields(line)`
38			`if len(f) < 1 {`
39			`continue`
40			`}`
41			`switch f[0] {`
42			`case "nameserver": // add one name server`
43			`a := conf.servers`
44			`n := len(a)`
45			`if len(f) > 1 && n < cap(a) {`
46			`// One more check: make sure server name is`
47			`// just an IP address. Otherwise we need DNS`
48			`// to look it up.`
49			`name := f[1]`
50			`switch len(ParseIP(name)) {`
51			`case 16:`
52			`name = "[" + name + "]"`
53			`fallthrough`
54			`case 4:`
55			`a = a[0 : n+1]`
56			`a[n] = name`
57			`conf.servers = a`
58			`}`
59			`}`
60
61			`case "domain": // set search path to just this domain`
62			`if len(f) > 1 {`
63			`conf.search = make([]string, 1)`
64			`conf.search[0] = f[1]`
65			`} else {`
66			`conf.search = make([]string, 0)`
67			`}`
68
69			`case "search": // set search path to given servers`
70			`conf.search = make([]string, len(f)-1)`
71			`for i := 0; i < len(conf.search); i++ {`
72			`conf.search[i] = f[i+1]`
73			`}`
74
75			`case "options": // magic options`
76			`for i := 1; i < len(f); i++ {`
77			`s := f[i]`
78			`switch {`
79			`case len(s) >= 6 && s[0:6] == "ndots:":`
80			`n, _, _ := dtoi(s, 6)`
81			`if n < 1 {`
82			`n = 1`
83			`}`
84			`conf.ndots = n`
85			`case len(s) >= 8 && s[0:8] == "timeout:":`
86			`n, _, _ := dtoi(s, 8)`
87			`if n < 1 {`
88			`n = 1`
89			`}`
90			`conf.timeout = n`
91			`case len(s) >= 8 && s[0:9] == "attempts:":`
92			`n, _, _ := dtoi(s, 9)`
93			`if n < 1 {`
94			`n = 1`
95			`}`
96			`conf.attempts = n`
97			`case s == "rotate":`
98			`conf.rotate = true`
99			`}`
100			`}`
101			`}`
102			`}`
103			`file.close()`
104
105			`return conf, nil`
106			`}`

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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [net/] [dnsconfig.go] - Blame information for rev 747