blob: b4470baa752573c29ea49bf6f853488f079cd730 [file] [log] [blame]
// Copyright 2013 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.
//go:build ignore
//go:generate go run gen.go
// This program generates internet protocol constants and tables by
// reading IANA protocol registries.
package main
import (
"bytes"
"encoding/xml"
"fmt"
"go/format"
"io"
"net/http"
"os"
"strconv"
"strings"
)
var registries = []struct {
url string
parse func(io.Writer, io.Reader) error
}{
{
"https://www.iana.org/assignments/dscp-registry/dscp-registry.xml",
parseDSCPRegistry,
},
{
"https://www.iana.org/assignments/protocol-numbers/protocol-numbers.xml",
parseProtocolNumbers,
},
{
"https://www.iana.org/assignments/address-family-numbers/address-family-numbers.xml",
parseAddrFamilyNumbers,
},
}
func main() {
var bb bytes.Buffer
fmt.Fprintf(&bb, "// go generate gen.go\n")
fmt.Fprintf(&bb, "// Code generated by the command above; DO NOT EDIT.\n\n")
fmt.Fprintf(&bb, "// Package iana provides protocol number resources managed by the Internet Assigned Numbers Authority (IANA).\n")
fmt.Fprintf(&bb, `package iana // import "golang.org/x/net/internal/iana"`+"\n\n")
for _, r := range registries {
resp, err := http.Get(r.url)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
fmt.Fprintf(os.Stderr, "got HTTP status code %v for %v\n", resp.StatusCode, r.url)
os.Exit(1)
}
if err := r.parse(&bb, resp.Body); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
fmt.Fprintf(&bb, "\n")
}
b, err := format.Source(bb.Bytes())
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
if err := os.WriteFile("const.go", b, 0644); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}
func parseDSCPRegistry(w io.Writer, r io.Reader) error {
dec := xml.NewDecoder(r)
var dr dscpRegistry
if err := dec.Decode(&dr); err != nil {
return err
}
fmt.Fprintf(w, "// %s, Updated: %s\n", dr.Title, dr.Updated)
fmt.Fprintf(w, "const (\n")
for _, dr := range dr.escapeDSCP() {
fmt.Fprintf(w, "DiffServ%s = %#02x", dr.Name, dr.Value)
fmt.Fprintf(w, "// %s\n", dr.OrigName)
}
for _, er := range dr.escapeECN() {
fmt.Fprintf(w, "%s = %#02x", er.Descr, er.Value)
fmt.Fprintf(w, "// %s\n", er.OrigDescr)
}
fmt.Fprintf(w, ")\n")
return nil
}
type dscpRegistry struct {
XMLName xml.Name `xml:"registry"`
Title string `xml:"title"`
Updated string `xml:"updated"`
Note string `xml:"note"`
Registries []struct {
Title string `xml:"title"`
Registries []struct {
Title string `xml:"title"`
Records []struct {
Name string `xml:"name"`
Space string `xml:"space"`
} `xml:"record"`
} `xml:"registry"`
Records []struct {
Value string `xml:"value"`
Descr string `xml:"description"`
} `xml:"record"`
} `xml:"registry"`
}
type canonDSCPRecord struct {
OrigName string
Name string
Value int
}
func (drr *dscpRegistry) escapeDSCP() []canonDSCPRecord {
var drs []canonDSCPRecord
for _, preg := range drr.Registries {
if !strings.Contains(preg.Title, "Differentiated Services Field Codepoints") {
continue
}
for _, reg := range preg.Registries {
if !strings.Contains(reg.Title, "Pool 1 Codepoints") {
continue
}
drs = make([]canonDSCPRecord, len(reg.Records))
sr := strings.NewReplacer(
"+", "",
"-", "",
"/", "",
".", "",
" ", "",
)
for i, dr := range reg.Records {
s := strings.TrimSpace(dr.Name)
drs[i].OrigName = s
drs[i].Name = sr.Replace(s)
n, err := strconv.ParseUint(dr.Space, 2, 8)
if err != nil {
continue
}
drs[i].Value = int(n) << 2
}
}
}
return drs
}
type canonECNRecord struct {
OrigDescr string
Descr string
Value int
}
func (drr *dscpRegistry) escapeECN() []canonECNRecord {
var ers []canonECNRecord
for _, reg := range drr.Registries {
if !strings.Contains(reg.Title, "ECN Field") {
continue
}
ers = make([]canonECNRecord, len(reg.Records))
sr := strings.NewReplacer(
"Capable", "",
"Not-ECT", "",
"ECT(1)", "",
"ECT(0)", "",
"CE", "",
"(", "",
")", "",
"+", "",
"-", "",
"/", "",
".", "",
" ", "",
)
for i, er := range reg.Records {
s := strings.TrimSpace(er.Descr)
ers[i].OrigDescr = s
ss := strings.Split(s, " ")
if len(ss) > 1 {
ers[i].Descr = strings.Join(ss[1:], " ")
} else {
ers[i].Descr = ss[0]
}
ers[i].Descr = sr.Replace(er.Descr)
n, err := strconv.ParseUint(er.Value, 2, 8)
if err != nil {
continue
}
ers[i].Value = int(n)
}
}
return ers
}
func parseProtocolNumbers(w io.Writer, r io.Reader) error {
dec := xml.NewDecoder(r)
var pn protocolNumbers
if err := dec.Decode(&pn); err != nil {
return err
}
prs := pn.escape()
prs = append([]canonProtocolRecord{{
Name: "IP",
Descr: "IPv4 encapsulation, pseudo protocol number",
Value: 0,
}}, prs...)
fmt.Fprintf(w, "// %s, Updated: %s\n", pn.Title, pn.Updated)
fmt.Fprintf(w, "const (\n")
for _, pr := range prs {
if pr.Name == "" {
continue
}
fmt.Fprintf(w, "Protocol%s = %d", pr.Name, pr.Value)
s := pr.Descr
if s == "" {
s = pr.OrigName
}
fmt.Fprintf(w, "// %s\n", s)
}
fmt.Fprintf(w, ")\n")
return nil
}
type protocolNumbers struct {
XMLName xml.Name `xml:"registry"`
Title string `xml:"title"`
Updated string `xml:"updated"`
RegTitle string `xml:"registry>title"`
Note string `xml:"registry>note"`
Records []struct {
Value string `xml:"value"`
Name string `xml:"name"`
Descr string `xml:"description"`
} `xml:"registry>record"`
}
type canonProtocolRecord struct {
OrigName string
Name string
Descr string
Value int
}
func (pn *protocolNumbers) escape() []canonProtocolRecord {
prs := make([]canonProtocolRecord, len(pn.Records))
sr := strings.NewReplacer(
"-in-", "in",
"-within-", "within",
"-over-", "over",
"+", "P",
"-", "",
"/", "",
".", "",
" ", "",
)
for i, pr := range pn.Records {
if strings.Contains(pr.Name, "Deprecated") ||
strings.Contains(pr.Name, "deprecated") {
continue
}
prs[i].OrigName = pr.Name
s := strings.TrimSpace(pr.Name)
switch pr.Name {
case "ISIS over IPv4":
prs[i].Name = "ISIS"
case "manet":
prs[i].Name = "MANET"
default:
prs[i].Name = sr.Replace(s)
}
ss := strings.Split(pr.Descr, "\n")
for i := range ss {
ss[i] = strings.TrimSpace(ss[i])
}
if len(ss) > 1 {
prs[i].Descr = strings.Join(ss, " ")
} else {
prs[i].Descr = ss[0]
}
prs[i].Value, _ = strconv.Atoi(pr.Value)
}
return prs
}
func parseAddrFamilyNumbers(w io.Writer, r io.Reader) error {
dec := xml.NewDecoder(r)
var afn addrFamilylNumbers
if err := dec.Decode(&afn); err != nil {
return err
}
afrs := afn.escape()
fmt.Fprintf(w, "// %s, Updated: %s\n", afn.Title, afn.Updated)
fmt.Fprintf(w, "const (\n")
for _, afr := range afrs {
if afr.Name == "" {
continue
}
fmt.Fprintf(w, "AddrFamily%s = %d", afr.Name, afr.Value)
fmt.Fprintf(w, "// %s\n", afr.Descr)
}
fmt.Fprintf(w, ")\n")
return nil
}
type addrFamilylNumbers struct {
XMLName xml.Name `xml:"registry"`
Title string `xml:"title"`
Updated string `xml:"updated"`
RegTitle string `xml:"registry>title"`
Note string `xml:"registry>note"`
Records []struct {
Value string `xml:"value"`
Descr string `xml:"description"`
} `xml:"registry>record"`
}
type canonAddrFamilyRecord struct {
Name string
Descr string
Value int
}
func (afn *addrFamilylNumbers) escape() []canonAddrFamilyRecord {
afrs := make([]canonAddrFamilyRecord, len(afn.Records))
sr := strings.NewReplacer(
"IP version 4", "IPv4",
"IP version 6", "IPv6",
"Identifier", "ID",
"-", "",
"-", "",
"/", "",
".", "",
" ", "",
)
for i, afr := range afn.Records {
if strings.Contains(afr.Descr, "Unassigned") ||
strings.Contains(afr.Descr, "Reserved") {
continue
}
afrs[i].Descr = afr.Descr
s := strings.TrimSpace(afr.Descr)
switch s {
case "IP (IP version 4)":
afrs[i].Name = "IPv4"
case "IP6 (IP version 6)":
afrs[i].Name = "IPv6"
case "AFI for L2VPN information":
afrs[i].Name = "L2VPN"
case "E.164 with NSAP format subaddress":
afrs[i].Name = "E164withSubaddress"
case "MT IP: Multi-Topology IP version 4":
afrs[i].Name = "MTIPv4"
case "MAC/24":
afrs[i].Name = "MACFinal24bits"
case "MAC/40":
afrs[i].Name = "MACFinal40bits"
case "IPv6/64":
afrs[i].Name = "IPv6Initial64bits"
default:
n := strings.Index(s, "(")
if n > 0 {
s = s[:n]
}
n = strings.Index(s, ":")
if n > 0 {
s = s[:n]
}
afrs[i].Name = sr.Replace(s)
}
afrs[i].Value, _ = strconv.Atoi(afr.Value)
}
return afrs
}