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

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Line No. Rev Author Line
1 747 jeremybenn 
// 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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// +build darwin freebsd linux netbsd openbsd
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package net
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import (
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        "errors"
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        "sync"
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)
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var (
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        protocols         map[string]int
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        onceReadProtocols sync.Once
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)
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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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        protocols = make(map[string]int)
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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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                                protocols[f[0]] = proto
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                                for _, alias := range f[2:] {
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                                        protocols[alias] = proto
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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) (proto int, err error) {
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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, errors.New("unknown IP protocol specified: " + name)
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        }
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        return
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}
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func lookupHost(host string) (addrs []string, err error) {
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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
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}
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func lookupIP(host string) (addrs []IP, err 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
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}
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func lookupPort(network, service string) (port int, err error) {
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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
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}
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func lookupCNAME(name string) (cname string, err error) {
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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
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}
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func lookupSRV(service, proto, name string) (cname string, addrs []*SRV, err error) {
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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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        var records []dnsRR
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        cname, records, err = lookup(target, dnsTypeSRV)
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        if err != nil {
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                return
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        }
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        addrs = make([]*SRV, len(records))
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        for i, rr := range records {
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                r := rr.(*dnsRR_SRV)
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                addrs[i] = &SRV{r.Target, r.Port, r.Priority, r.Weight}
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        }
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        byPriorityWeight(addrs).sort()
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        return
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}
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func lookupMX(name string) (mx []*MX, err error) {
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        _, records, err := lookup(name, dnsTypeMX)
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        if err != nil {
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                return
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        }
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        mx = make([]*MX, len(records))
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        for i, rr := range records {
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                r := rr.(*dnsRR_MX)
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                mx[i] = &MX{r.Mx, r.Pref}
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        }
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        byPref(mx).sort()
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        return
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}
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func lookupTXT(name string) (txt []string, err error) {
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        _, records, err := lookup(name, dnsTypeTXT)
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        if err != nil {
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                return
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        }
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        txt = make([]string, len(records))
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        for i, r := range records {
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                txt[i] = r.(*dnsRR_TXT).Txt
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        }
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        return
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}
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func lookupAddr(addr string) (name []string, err error) {
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        name = lookupStaticAddr(addr)
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        if len(name) > 0 {
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                return
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        }
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        var arpa string
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        arpa, err = reverseaddr(addr)
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        if err != nil {
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                return
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        }
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        var records []dnsRR
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        _, records, err = lookup(arpa, dnsTypePTR)
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        if err != nil {
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                return
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        }
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        name = make([]string, len(records))
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        for i := range records {
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                r := records[i].(*dnsRR_PTR)
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                name[i] = r.Ptr
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        }
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        return
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}

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