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// Copyright 2012 Google, Inc. All rights reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file in the root of the source
// tree.
// +build ignore
// This binary pulls known ports from IANA, and uses them to populate
// iana_ports.go's TCPPortNames and UDPPortNames maps.
//
// go run gen.go | gofmt > iana_ports.go
package main
import (
"bytes"
"encoding/xml"
"flag"
"fmt"
"io/ioutil"
"net/http"
"os"
"strconv"
"time"
)
const fmtString = `// Copyright 2012 Google, Inc. All rights reserved.
package layers
// Created by gen.go, don't edit manually
// Generated at %s
// Fetched from %q
// TCPPortNames contains the port names for all TCP ports.
var TCPPortNames = tcpPortNames
// UDPPortNames contains the port names for all UDP ports.
var UDPPortNames = udpPortNames
// SCTPPortNames contains the port names for all SCTP ports.
var SCTPPortNames = sctpPortNames
var tcpPortNames = map[TCPPort]string{
%s}
var udpPortNames = map[UDPPort]string{
%s}
var sctpPortNames = map[SCTPPort]string{
%s}
`
var url = flag.String("url", "http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xml", "URL to grab port numbers from")
func main() {
fmt.Fprintf(os.Stderr, "Fetching ports from %q\n", *url)
resp, err := http.Get(*url)
if err != nil {
panic(err)
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
panic(err)
}
fmt.Fprintln(os.Stderr, "Parsing XML")
var registry struct {
Records []struct {
Protocol string `xml:"protocol"`
Number string `xml:"number"`
Name string `xml:"name"`
} `xml:"record"`
}
xml.Unmarshal(body, ®istry)
var tcpPorts bytes.Buffer
var udpPorts bytes.Buffer
var sctpPorts bytes.Buffer
done := map[string]map[int]bool{
"tcp": map[int]bool{},
"udp": map[int]bool{},
"sctp": map[int]bool{},
}
for _, r := range registry.Records {
port, err := strconv.Atoi(r.Number)
if err != nil {
continue
}
if r.Name == "" {
continue
}
var b *bytes.Buffer
switch r.Protocol {
case "tcp":
b = &tcpPorts
case "udp":
b = &udpPorts
case "sctp":
b = &sctpPorts
default:
continue
}
if done[r.Protocol][port] {
continue
}
done[r.Protocol][port] = true
fmt.Fprintf(b, "\t%d: %q,\n", port, r.Name)
}
fmt.Fprintln(os.Stderr, "Writing results to stdout")
fmt.Printf(fmtString, time.Now(), *url, tcpPorts.String(), udpPorts.String(), sctpPorts.String())
}
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