383 lines
8.7 KiB
Go
383 lines
8.7 KiB
Go
// Copyright 2013 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 ignore
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//go:generate go run gen.go
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// This program generates internet protocol constants and tables by
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// reading IANA protocol registries.
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package main
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import (
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"bytes"
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"encoding/xml"
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"fmt"
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"go/format"
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"io"
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"io/ioutil"
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"net/http"
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"os"
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"strconv"
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"strings"
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)
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var registries = []struct {
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url string
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parse func(io.Writer, io.Reader) error
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}{
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{
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"https://www.iana.org/assignments/dscp-registry/dscp-registry.xml",
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parseDSCPRegistry,
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},
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{
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"https://www.iana.org/assignments/protocol-numbers/protocol-numbers.xml",
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parseProtocolNumbers,
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},
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{
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"https://www.iana.org/assignments/address-family-numbers/address-family-numbers.xml",
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parseAddrFamilyNumbers,
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},
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}
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func main() {
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var bb bytes.Buffer
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fmt.Fprintf(&bb, "// go generate gen.go\n")
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fmt.Fprintf(&bb, "// Code generated by the command above; DO NOT EDIT.\n\n")
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fmt.Fprintf(&bb, "// Package iana provides protocol number resources managed by the Internet Assigned Numbers Authority (IANA).\n")
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fmt.Fprintf(&bb, `package iana // import "golang.org/x/net/internal/iana"`+"\n\n")
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for _, r := range registries {
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resp, err := http.Get(r.url)
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if err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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fmt.Fprintf(os.Stderr, "got HTTP status code %v for %v\n", resp.StatusCode, r.url)
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os.Exit(1)
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}
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if err := r.parse(&bb, resp.Body); err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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fmt.Fprintf(&bb, "\n")
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}
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b, err := format.Source(bb.Bytes())
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if err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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if err := ioutil.WriteFile("const.go", b, 0644); err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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}
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func parseDSCPRegistry(w io.Writer, r io.Reader) error {
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dec := xml.NewDecoder(r)
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var dr dscpRegistry
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if err := dec.Decode(&dr); err != nil {
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return err
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}
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fmt.Fprintf(w, "// %s, Updated: %s\n", dr.Title, dr.Updated)
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fmt.Fprintf(w, "const (\n")
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for _, dr := range dr.escapeDSCP() {
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fmt.Fprintf(w, "DiffServ%s = %#02x", dr.Name, dr.Value)
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fmt.Fprintf(w, "// %s\n", dr.OrigName)
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}
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for _, er := range dr.escapeECN() {
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fmt.Fprintf(w, "%s = %#02x", er.Descr, er.Value)
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fmt.Fprintf(w, "// %s\n", er.OrigDescr)
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}
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fmt.Fprintf(w, ")\n")
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return nil
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}
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type dscpRegistry struct {
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XMLName xml.Name `xml:"registry"`
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Title string `xml:"title"`
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Updated string `xml:"updated"`
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Note string `xml:"note"`
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Registries []struct {
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Title string `xml:"title"`
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Registries []struct {
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Title string `xml:"title"`
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Records []struct {
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Name string `xml:"name"`
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Space string `xml:"space"`
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} `xml:"record"`
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} `xml:"registry"`
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Records []struct {
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Value string `xml:"value"`
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Descr string `xml:"description"`
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} `xml:"record"`
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} `xml:"registry"`
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}
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type canonDSCPRecord struct {
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OrigName string
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Name string
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Value int
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}
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func (drr *dscpRegistry) escapeDSCP() []canonDSCPRecord {
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var drs []canonDSCPRecord
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for _, preg := range drr.Registries {
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if !strings.Contains(preg.Title, "Differentiated Services Field Codepoints") {
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continue
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}
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for _, reg := range preg.Registries {
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if !strings.Contains(reg.Title, "Pool 1 Codepoints") {
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continue
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}
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drs = make([]canonDSCPRecord, len(reg.Records))
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sr := strings.NewReplacer(
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"+", "",
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"-", "",
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"/", "",
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".", "",
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" ", "",
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)
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for i, dr := range reg.Records {
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s := strings.TrimSpace(dr.Name)
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drs[i].OrigName = s
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drs[i].Name = sr.Replace(s)
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n, err := strconv.ParseUint(dr.Space, 2, 8)
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if err != nil {
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continue
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}
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drs[i].Value = int(n) << 2
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}
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}
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}
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return drs
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}
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type canonECNRecord struct {
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OrigDescr string
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Descr string
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Value int
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}
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func (drr *dscpRegistry) escapeECN() []canonECNRecord {
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var ers []canonECNRecord
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for _, reg := range drr.Registries {
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if !strings.Contains(reg.Title, "ECN Field") {
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continue
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}
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ers = make([]canonECNRecord, len(reg.Records))
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sr := strings.NewReplacer(
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"Capable", "",
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"Not-ECT", "",
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"ECT(1)", "",
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"ECT(0)", "",
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"CE", "",
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"(", "",
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")", "",
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"+", "",
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"-", "",
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"/", "",
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".", "",
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" ", "",
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)
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for i, er := range reg.Records {
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s := strings.TrimSpace(er.Descr)
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ers[i].OrigDescr = s
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ss := strings.Split(s, " ")
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if len(ss) > 1 {
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ers[i].Descr = strings.Join(ss[1:], " ")
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} else {
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ers[i].Descr = ss[0]
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}
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ers[i].Descr = sr.Replace(er.Descr)
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n, err := strconv.ParseUint(er.Value, 2, 8)
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if err != nil {
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continue
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}
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ers[i].Value = int(n)
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}
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}
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return ers
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}
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func parseProtocolNumbers(w io.Writer, r io.Reader) error {
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dec := xml.NewDecoder(r)
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var pn protocolNumbers
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if err := dec.Decode(&pn); err != nil {
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return err
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}
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prs := pn.escape()
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prs = append([]canonProtocolRecord{{
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Name: "IP",
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Descr: "IPv4 encapsulation, pseudo protocol number",
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Value: 0,
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}}, prs...)
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fmt.Fprintf(w, "// %s, Updated: %s\n", pn.Title, pn.Updated)
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fmt.Fprintf(w, "const (\n")
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for _, pr := range prs {
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if pr.Name == "" {
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continue
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}
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fmt.Fprintf(w, "Protocol%s = %d", pr.Name, pr.Value)
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s := pr.Descr
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if s == "" {
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s = pr.OrigName
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}
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fmt.Fprintf(w, "// %s\n", s)
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}
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fmt.Fprintf(w, ")\n")
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return nil
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}
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type protocolNumbers struct {
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XMLName xml.Name `xml:"registry"`
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Title string `xml:"title"`
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Updated string `xml:"updated"`
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RegTitle string `xml:"registry>title"`
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Note string `xml:"registry>note"`
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Records []struct {
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Value string `xml:"value"`
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Name string `xml:"name"`
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Descr string `xml:"description"`
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} `xml:"registry>record"`
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}
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type canonProtocolRecord struct {
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OrigName string
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Name string
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Descr string
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Value int
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}
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func (pn *protocolNumbers) escape() []canonProtocolRecord {
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prs := make([]canonProtocolRecord, len(pn.Records))
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sr := strings.NewReplacer(
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"-in-", "in",
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"-within-", "within",
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"-over-", "over",
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"+", "P",
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"-", "",
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"/", "",
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".", "",
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" ", "",
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)
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for i, pr := range pn.Records {
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if strings.Contains(pr.Name, "Deprecated") ||
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strings.Contains(pr.Name, "deprecated") {
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continue
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}
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prs[i].OrigName = pr.Name
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s := strings.TrimSpace(pr.Name)
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switch pr.Name {
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case "ISIS over IPv4":
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prs[i].Name = "ISIS"
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case "manet":
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prs[i].Name = "MANET"
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default:
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prs[i].Name = sr.Replace(s)
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}
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ss := strings.Split(pr.Descr, "\n")
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for i := range ss {
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ss[i] = strings.TrimSpace(ss[i])
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}
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if len(ss) > 1 {
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prs[i].Descr = strings.Join(ss, " ")
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} else {
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prs[i].Descr = ss[0]
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}
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prs[i].Value, _ = strconv.Atoi(pr.Value)
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}
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return prs
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}
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func parseAddrFamilyNumbers(w io.Writer, r io.Reader) error {
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dec := xml.NewDecoder(r)
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var afn addrFamilylNumbers
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if err := dec.Decode(&afn); err != nil {
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return err
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}
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afrs := afn.escape()
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fmt.Fprintf(w, "// %s, Updated: %s\n", afn.Title, afn.Updated)
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fmt.Fprintf(w, "const (\n")
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for _, afr := range afrs {
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if afr.Name == "" {
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continue
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}
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fmt.Fprintf(w, "AddrFamily%s = %d", afr.Name, afr.Value)
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fmt.Fprintf(w, "// %s\n", afr.Descr)
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}
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fmt.Fprintf(w, ")\n")
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return nil
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}
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type addrFamilylNumbers struct {
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XMLName xml.Name `xml:"registry"`
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Title string `xml:"title"`
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Updated string `xml:"updated"`
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RegTitle string `xml:"registry>title"`
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Note string `xml:"registry>note"`
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Records []struct {
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Value string `xml:"value"`
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Descr string `xml:"description"`
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} `xml:"registry>record"`
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}
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type canonAddrFamilyRecord struct {
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Name string
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Descr string
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Value int
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}
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func (afn *addrFamilylNumbers) escape() []canonAddrFamilyRecord {
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afrs := make([]canonAddrFamilyRecord, len(afn.Records))
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sr := strings.NewReplacer(
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"IP version 4", "IPv4",
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"IP version 6", "IPv6",
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"Identifier", "ID",
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"-", "",
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"-", "",
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"/", "",
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".", "",
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" ", "",
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)
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for i, afr := range afn.Records {
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if strings.Contains(afr.Descr, "Unassigned") ||
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strings.Contains(afr.Descr, "Reserved") {
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continue
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}
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afrs[i].Descr = afr.Descr
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s := strings.TrimSpace(afr.Descr)
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switch s {
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case "IP (IP version 4)":
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afrs[i].Name = "IPv4"
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case "IP6 (IP version 6)":
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afrs[i].Name = "IPv6"
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case "AFI for L2VPN information":
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afrs[i].Name = "L2VPN"
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case "E.164 with NSAP format subaddress":
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afrs[i].Name = "E164withSubaddress"
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case "MT IP: Multi-Topology IP version 4":
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afrs[i].Name = "MTIPv4"
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case "MAC/24":
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afrs[i].Name = "MACFinal24bits"
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case "MAC/40":
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afrs[i].Name = "MACFinal40bits"
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case "IPv6/64":
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afrs[i].Name = "IPv6Initial64bits"
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default:
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n := strings.Index(s, "(")
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if n > 0 {
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s = s[:n]
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}
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n = strings.Index(s, ":")
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if n > 0 {
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s = s[:n]
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}
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afrs[i].Name = sr.Replace(s)
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}
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afrs[i].Value, _ = strconv.Atoi(afr.Value)
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}
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return afrs
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}
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