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// 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
//go:generate go run gen.go
// This program generates system adaptation constants and types,
// internet protocol constants and tables by reading template files
// and IANA protocol registries.
package main
import (
"bytes"
"encoding/xml"
"fmt"
"go/format"
"io"
"io/ioutil"
"net/http"
"os"
"os/exec"
"runtime"
"strconv"
"strings"
)
func main() {
if err := genzsys(); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
if err := geniana(); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}
func genzsys() error {
defs := "defs_" + runtime.GOOS + ".go"
f, err := os.Open(defs)
if err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
f.Close()
cmd := exec.Command("go", "tool", "cgo", "-godefs", defs)
b, err := cmd.Output()
if err != nil {
return err
}
b, err = format.Source(b)
if err != nil {
return err
}
zsys := "zsys_" + runtime.GOOS + ".go"
switch runtime.GOOS {
case "freebsd", "linux":
zsys = "zsys_" + runtime.GOOS + "_" + runtime.GOARCH + ".go"
}
if err := ioutil.WriteFile(zsys, b, 0644); err != nil {
return err
}
return nil
}
var registries = []struct {
url string
parse func(io.Writer, io.Reader) error
}{
{
"https://www.iana.org/assignments/icmp-parameters/icmp-parameters.xml",
parseICMPv4Parameters,
},
}
func geniana() error {
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 ipv4\n\n")
for _, r := range registries {
resp, err := http.Get(r.url)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("got HTTP status code %v for %v\n", resp.StatusCode, r.url)
}
if err := r.parse(&bb, resp.Body); err != nil {
return err
}
fmt.Fprintf(&bb, "\n")
}
b, err := format.Source(bb.Bytes())
if err != nil {
return err
}
if err := ioutil.WriteFile("iana.go", b, 0644); err != nil {
return err
}
return nil
}
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()
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 []struct {
Title string `xml:"title"`
Records []struct {
Value string `xml:"value"`
Descr string `xml:"description"`
} `xml:"record"`
} `xml:"registry"`
}
type canonICMPv4ParamRecord struct {
OrigDescr string
Descr string
Value int
}
func (icp *icmpv4Parameters) escape() []canonICMPv4ParamRecord {
id := -1
for i, r := range icp.Registries {
if strings.Contains(r.Title, "Type") || strings.Contains(r.Title, "type") {
id = i
break
}
}
if id < 0 {
return nil
}
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
}
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