go.net/ipv4: drop DIffServ and ECN constants, add ICMPType
This CL removes DiffServ and ECN constants assigned by IANA because
for now we don't have an appropriate package to put those constants
as part of API. There were used for the type-of-service field of IPv4
header and the traffic class field of IPv6 header.
Also adds ICMPType for convenience, makes use of internal IANA
protocol number constants instead of syscall's to prevent churning of
package syscall in the near future.
R=dave
CC=golang-dev
https://golang.org/cl/9353045
diff --git a/ipv4/gen.go b/ipv4/gen.go
new file mode 100644
index 0000000..673065f
--- /dev/null
+++ b/ipv4/gen.go
@@ -0,0 +1,242 @@
+// 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.
+
+// +build ignore
+
+// This program generates internet protocol constatns and tables by
+// reading IANA protocol registries.
+//
+// Usage of this program:
+// go run gen.go > iana.go
+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
+}{
+ {
+ "http://www.iana.org/assignments/icmp-parameters",
+ parseICMPv4Parameters,
+ },
+ {
+ "http://www.iana.org/assignments/protocol-numbers/protocol-numbers.xml",
+ parseProtocolNumbers,
+ },
+}
+
+func main() {
+ var bb bytes.Buffer
+ fmt.Fprintf(&bb, "// go run gen.go\n")
+ fmt.Fprintf(&bb, "// GENERATED BY THE COMMAND ABOVE; DO NOT EDIT\n\n")
+ fmt.Fprintf(&bb, "package ipv4\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)
+ }
+ os.Stdout.Write(b)
+}
+
+func parseICMPv4Parameters(w io.Writer, r io.Reader) error {
+ dec := xml.NewDecoder(r)
+ var icp icmpv4Parameters
+ if err := dec.Decode(&icp); err != nil {
+ return err
+ }
+ prs := icp.escape(0)
+ fmt.Fprintf(w, "// %s, Updated: %s\n", icp.Title, icp.Updated)
+ fmt.Fprintf(w, "const (\n")
+ for _, pr := range prs {
+ if pr.Descr == "" {
+ continue
+ }
+ fmt.Fprintf(w, "ICMPType%s ICMPType = %d", pr.Descr, pr.Value)
+ fmt.Fprintf(w, "// %s\n", pr.OrigDescr)
+ }
+ fmt.Fprintf(w, ")\n\n")
+ fmt.Fprintf(w, "// %s, Updated: %s\n", icp.Title, icp.Updated)
+ fmt.Fprintf(w, "var icmpTypes = map[ICMPType]string{\n")
+ for _, pr := range prs {
+ if pr.Descr == "" {
+ continue
+ }
+ fmt.Fprintf(w, "%d: %q,\n", pr.Value, strings.ToLower(pr.OrigDescr))
+ }
+ fmt.Fprintf(w, "}\n")
+ return nil
+}
+
+type icmpv4Parameters struct {
+ XMLName xml.Name `xml:"registry"`
+ Title string `xml:"title"`
+ Updated string `xml:"updated"`
+ Registries []icmpv4ParamRegistry `xml:"registry"`
+}
+
+type icmpv4ParamRegistry struct {
+ Title string `xml:"title"`
+ Records []icmpv4ParamRecord `xml:"record"`
+}
+
+type icmpv4ParamRecord struct {
+ Value string `xml:"value"`
+ Descr string `xml:"description"`
+}
+
+type canonICMPv4ParamRecord struct {
+ OrigDescr string
+ Descr string
+ Value int
+}
+
+func (icp *icmpv4Parameters) escape(id int) []canonICMPv4ParamRecord {
+ prs := make([]canonICMPv4ParamRecord, len(icp.Registries[id].Records))
+ sr := strings.NewReplacer(
+ "Messages", "",
+ "Message", "",
+ "ICMP", "",
+ "+", "P",
+ "-", "",
+ "/", "",
+ ".", "",
+ " ", "",
+ )
+ for i, pr := range icp.Registries[id].Records {
+ if strings.Contains(pr.Descr, "Reserved") ||
+ strings.Contains(pr.Descr, "Unassigned") ||
+ strings.Contains(pr.Descr, "Deprecated") ||
+ strings.Contains(pr.Descr, "Experiment") ||
+ strings.Contains(pr.Descr, "experiment") {
+ continue
+ }
+ ss := strings.Split(pr.Descr, "\n")
+ if len(ss) > 1 {
+ prs[i].Descr = strings.Join(ss, " ")
+ } else {
+ prs[i].Descr = ss[0]
+ }
+ s := strings.TrimSpace(prs[i].Descr)
+ prs[i].OrigDescr = s
+ prs[i].Descr = sr.Replace(s)
+ prs[i].Value, _ = strconv.Atoi(pr.Value)
+ }
+ return prs
+}
+
+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, "ianaProtocol%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 []protocolRecord `xml:"registry>record"`
+}
+
+type protocolRecord struct {
+ Value string `xml:"value"`
+ Name string `xml:"name"`
+ Descr string `xml:"description"`
+}
+
+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 {
+ 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
+}
