2011-06-12 18:22:31 -06:00
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// Copyright 2011 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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2014-09-18 04:17:55 -06:00
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// +build darwin dragonfly freebsd linux netbsd openbsd solaris
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build: add build comments to core packages
The go/build package already recognizes
system-specific file names like
mycode_darwin.go
mycode_darwin_386.go
mycode_386.s
However, it is also common to write files that
apply to multiple architectures, so a recent CL added
to go/build the ability to process comments
listing a set of conditions for building. For example:
// +build darwin freebsd openbsd/386
says that this file should be compiled only on
OS X, FreeBSD, or 32-bit x86 OpenBSD systems.
These conventions are not yet documented
(hence this long CL description).
This CL adds build comments to the multi-system
files in the core library, a step toward making it
possible to use go/build to build them.
With this change go/build can handle crypto/rand,
exec, net, path/filepath, os/user, and time.
os and syscall need additional adjustments.
R=golang-dev, r, gri, r, gustavo
CC=golang-dev
https://golang.org/cl/5011046
2011-09-15 14:48:57 -06:00
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2011-06-12 18:22:31 -06:00
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package net
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2015-04-19 05:54:01 -06:00
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import "sync"
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2011-06-12 18:22:31 -06:00
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2013-08-21 19:33:37 -06:00
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var onceReadProtocols sync.Once
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2011-10-11 17:29:22 -06:00
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// readProtocols loads contents of /etc/protocols into protocols map
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// for quick access.
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func readProtocols() {
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if file, err := open("/etc/protocols"); err == nil {
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for line, ok := file.readLine(); ok; line, ok = file.readLine() {
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// tcp 6 TCP # transmission control protocol
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if i := byteIndex(line, '#'); i >= 0 {
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line = line[0:i]
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}
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f := getFields(line)
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if len(f) < 2 {
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continue
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}
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if proto, _, ok := dtoi(f[1], 0); ok {
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if _, ok := protocols[f[0]]; !ok {
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protocols[f[0]] = proto
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}
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for _, alias := range f[2:] {
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if _, ok := protocols[alias]; !ok {
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protocols[alias] = proto
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}
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2011-10-11 17:29:22 -06:00
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}
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}
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}
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file.close()
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}
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}
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// lookupProtocol looks up IP protocol name in /etc/protocols and
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// returns correspondent protocol number.
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func lookupProtocol(name string) (int, error) {
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2011-10-11 17:29:22 -06:00
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onceReadProtocols.Do(readProtocols)
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proto, found := protocols[name]
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if !found {
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return 0, &AddrError{Err: "unknown IP protocol specified", Addr: name}
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}
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return proto, nil
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2011-10-11 17:29:22 -06:00
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}
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2015-04-19 05:54:01 -06:00
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func lookupHost(host string) ([]string, error) {
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2011-06-12 18:22:31 -06:00
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addrs, err, ok := cgoLookupHost(host)
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if !ok {
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addrs, err = goLookupHost(host)
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}
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return addrs, err
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}
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func lookupIP(host string) ([]IPAddr, error) {
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addrs, err, ok := cgoLookupIP(host)
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if !ok {
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addrs, err = goLookupIP(host)
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}
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return addrs, err
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2011-06-12 18:22:31 -06:00
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}
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func lookupPort(network, service string) (int, error) {
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2011-06-12 18:22:31 -06:00
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port, err, ok := cgoLookupPort(network, service)
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if !ok {
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port, err = goLookupPort(network, service)
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}
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return port, err
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2011-06-12 18:22:31 -06:00
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}
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2015-04-19 05:54:01 -06:00
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func lookupCNAME(name string) (string, error) {
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2011-06-12 18:22:31 -06:00
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cname, err, ok := cgoLookupCNAME(name)
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if !ok {
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cname, err = goLookupCNAME(name)
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}
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return cname, err
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2011-06-12 18:22:31 -06:00
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}
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2015-04-19 05:54:01 -06:00
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func lookupSRV(service, proto, name string) (string, []*SRV, error) {
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2011-10-18 11:57:04 -06:00
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var target string
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if service == "" && proto == "" {
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target = name
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} else {
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target = "_" + service + "._" + proto + "." + name
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}
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2015-04-19 05:54:01 -06:00
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cname, rrs, err := lookup(target, dnsTypeSRV)
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2011-06-12 18:22:31 -06:00
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if err != nil {
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2015-04-19 05:54:01 -06:00
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return "", nil, err
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2011-06-12 18:22:31 -06:00
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}
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2015-04-19 05:54:01 -06:00
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srvs := make([]*SRV, len(rrs))
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for i, rr := range rrs {
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rr := rr.(*dnsRR_SRV)
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srvs[i] = &SRV{Target: rr.Target, Port: rr.Port, Priority: rr.Priority, Weight: rr.Weight}
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2011-06-12 18:22:31 -06:00
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}
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2015-04-19 05:54:01 -06:00
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byPriorityWeight(srvs).sort()
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return cname, srvs, nil
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2011-06-12 18:22:31 -06:00
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}
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2015-04-19 05:54:01 -06:00
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func lookupMX(name string) ([]*MX, error) {
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_, rrs, err := lookup(name, dnsTypeMX)
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2011-06-12 18:22:31 -06:00
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if err != nil {
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2015-04-19 05:54:01 -06:00
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return nil, err
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2011-06-12 18:22:31 -06:00
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}
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2015-04-19 05:54:01 -06:00
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mxs := make([]*MX, len(rrs))
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for i, rr := range rrs {
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rr := rr.(*dnsRR_MX)
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mxs[i] = &MX{Host: rr.Mx, Pref: rr.Pref}
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2011-06-12 18:22:31 -06:00
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}
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2015-04-19 05:54:01 -06:00
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byPref(mxs).sort()
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return mxs, nil
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2011-06-12 18:22:31 -06:00
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}
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2015-04-19 05:54:01 -06:00
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func lookupNS(name string) ([]*NS, error) {
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_, rrs, err := lookup(name, dnsTypeNS)
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if err != nil {
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2015-04-19 05:54:01 -06:00
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return nil, err
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2012-10-18 00:39:04 -06:00
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}
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2015-04-19 05:54:01 -06:00
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nss := make([]*NS, len(rrs))
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for i, rr := range rrs {
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nss[i] = &NS{Host: rr.(*dnsRR_NS).Ns}
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2012-10-18 00:39:04 -06:00
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}
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2015-04-19 05:54:01 -06:00
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return nss, nil
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2012-10-18 00:39:04 -06:00
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}
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2015-04-19 05:54:01 -06:00
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func lookupTXT(name string) ([]string, error) {
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_, rrs, err := lookup(name, dnsTypeTXT)
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if err != nil {
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2015-04-19 05:54:01 -06:00
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return nil, err
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2011-09-12 21:05:33 -06:00
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}
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2015-04-19 05:54:01 -06:00
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txts := make([]string, len(rrs))
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for i, rr := range rrs {
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txts[i] = rr.(*dnsRR_TXT).Txt
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2011-09-12 21:05:33 -06:00
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}
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return txts, nil
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2011-09-12 21:05:33 -06:00
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}
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2015-04-19 05:54:01 -06:00
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func lookupAddr(addr string) ([]string, error) {
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names := lookupStaticAddr(addr)
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if len(names) > 0 {
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return names, nil
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2011-06-12 18:22:31 -06:00
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}
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2015-04-19 05:54:01 -06:00
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arpa, err := reverseaddr(addr)
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2011-06-12 18:22:31 -06:00
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if err != nil {
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2015-04-19 05:54:01 -06:00
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return nil, err
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2011-06-12 18:22:31 -06:00
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}
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2015-04-19 05:54:01 -06:00
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_, rrs, err := lookup(arpa, dnsTypePTR)
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2011-06-12 18:22:31 -06:00
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if err != nil {
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2015-04-19 05:54:01 -06:00
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return nil, err
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2011-06-12 18:22:31 -06:00
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}
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2015-04-19 05:54:01 -06:00
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ptrs := make([]string, len(rrs))
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for i, rr := range rrs {
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ptrs[i] = rr.(*dnsRR_PTR).Ptr
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2011-06-12 18:22:31 -06:00
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}
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return ptrs, nil
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2011-06-12 18:22:31 -06:00
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}
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