David K. Bainbridge | 215e024 | 2017-09-05 23:18:24 -0700 | [diff] [blame] | 1 | // Copyright 2013 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | // +build ignore |
| 6 | |
| 7 | //go:generate go run gen.go |
| 8 | |
| 9 | // This program generates system adaptation constants and types, |
| 10 | // internet protocol constants and tables by reading template files |
| 11 | // and IANA protocol registries. |
| 12 | package main |
| 13 | |
| 14 | import ( |
| 15 | "bytes" |
| 16 | "encoding/xml" |
| 17 | "fmt" |
| 18 | "go/format" |
| 19 | "io" |
| 20 | "io/ioutil" |
| 21 | "net/http" |
| 22 | "os" |
| 23 | "os/exec" |
| 24 | "runtime" |
| 25 | "strconv" |
| 26 | "strings" |
| 27 | ) |
| 28 | |
| 29 | func main() { |
| 30 | if err := genzsys(); err != nil { |
| 31 | fmt.Fprintln(os.Stderr, err) |
| 32 | os.Exit(1) |
| 33 | } |
| 34 | if err := geniana(); err != nil { |
| 35 | fmt.Fprintln(os.Stderr, err) |
| 36 | os.Exit(1) |
| 37 | } |
| 38 | } |
| 39 | |
| 40 | func genzsys() error { |
| 41 | defs := "defs_" + runtime.GOOS + ".go" |
| 42 | f, err := os.Open(defs) |
| 43 | if err != nil { |
| 44 | if os.IsNotExist(err) { |
| 45 | return nil |
| 46 | } |
| 47 | return err |
| 48 | } |
| 49 | f.Close() |
| 50 | cmd := exec.Command("go", "tool", "cgo", "-godefs", defs) |
| 51 | b, err := cmd.Output() |
| 52 | if err != nil { |
| 53 | return err |
| 54 | } |
| 55 | b, err = format.Source(b) |
| 56 | if err != nil { |
| 57 | return err |
| 58 | } |
| 59 | zsys := "zsys_" + runtime.GOOS + ".go" |
| 60 | switch runtime.GOOS { |
| 61 | case "freebsd", "linux": |
| 62 | zsys = "zsys_" + runtime.GOOS + "_" + runtime.GOARCH + ".go" |
| 63 | } |
| 64 | if err := ioutil.WriteFile(zsys, b, 0644); err != nil { |
| 65 | return err |
| 66 | } |
| 67 | return nil |
| 68 | } |
| 69 | |
| 70 | var registries = []struct { |
| 71 | url string |
| 72 | parse func(io.Writer, io.Reader) error |
| 73 | }{ |
| 74 | { |
| 75 | "http://www.iana.org/assignments/icmpv6-parameters/icmpv6-parameters.xml", |
| 76 | parseICMPv6Parameters, |
| 77 | }, |
| 78 | } |
| 79 | |
| 80 | func geniana() error { |
| 81 | var bb bytes.Buffer |
| 82 | fmt.Fprintf(&bb, "// go generate gen.go\n") |
| 83 | fmt.Fprintf(&bb, "// GENERATED BY THE COMMAND ABOVE; DO NOT EDIT\n\n") |
| 84 | fmt.Fprintf(&bb, "package ipv6\n\n") |
| 85 | for _, r := range registries { |
| 86 | resp, err := http.Get(r.url) |
| 87 | if err != nil { |
| 88 | return err |
| 89 | } |
| 90 | defer resp.Body.Close() |
| 91 | if resp.StatusCode != http.StatusOK { |
| 92 | return fmt.Errorf("got HTTP status code %v for %v\n", resp.StatusCode, r.url) |
| 93 | } |
| 94 | if err := r.parse(&bb, resp.Body); err != nil { |
| 95 | return err |
| 96 | } |
| 97 | fmt.Fprintf(&bb, "\n") |
| 98 | } |
| 99 | b, err := format.Source(bb.Bytes()) |
| 100 | if err != nil { |
| 101 | return err |
| 102 | } |
| 103 | if err := ioutil.WriteFile("iana.go", b, 0644); err != nil { |
| 104 | return err |
| 105 | } |
| 106 | return nil |
| 107 | } |
| 108 | |
| 109 | func parseICMPv6Parameters(w io.Writer, r io.Reader) error { |
| 110 | dec := xml.NewDecoder(r) |
| 111 | var icp icmpv6Parameters |
| 112 | if err := dec.Decode(&icp); err != nil { |
| 113 | return err |
| 114 | } |
| 115 | prs := icp.escape() |
| 116 | fmt.Fprintf(w, "// %s, Updated: %s\n", icp.Title, icp.Updated) |
| 117 | fmt.Fprintf(w, "const (\n") |
| 118 | for _, pr := range prs { |
| 119 | if pr.Name == "" { |
| 120 | continue |
| 121 | } |
| 122 | fmt.Fprintf(w, "ICMPType%s ICMPType = %d", pr.Name, pr.Value) |
| 123 | fmt.Fprintf(w, "// %s\n", pr.OrigName) |
| 124 | } |
| 125 | fmt.Fprintf(w, ")\n\n") |
| 126 | fmt.Fprintf(w, "// %s, Updated: %s\n", icp.Title, icp.Updated) |
| 127 | fmt.Fprintf(w, "var icmpTypes = map[ICMPType]string{\n") |
| 128 | for _, pr := range prs { |
| 129 | if pr.Name == "" { |
| 130 | continue |
| 131 | } |
| 132 | fmt.Fprintf(w, "%d: %q,\n", pr.Value, strings.ToLower(pr.OrigName)) |
| 133 | } |
| 134 | fmt.Fprintf(w, "}\n") |
| 135 | return nil |
| 136 | } |
| 137 | |
| 138 | type icmpv6Parameters struct { |
| 139 | XMLName xml.Name `xml:"registry"` |
| 140 | Title string `xml:"title"` |
| 141 | Updated string `xml:"updated"` |
| 142 | Registries []struct { |
| 143 | Title string `xml:"title"` |
| 144 | Records []struct { |
| 145 | Value string `xml:"value"` |
| 146 | Name string `xml:"name"` |
| 147 | } `xml:"record"` |
| 148 | } `xml:"registry"` |
| 149 | } |
| 150 | |
| 151 | type canonICMPv6ParamRecord struct { |
| 152 | OrigName string |
| 153 | Name string |
| 154 | Value int |
| 155 | } |
| 156 | |
| 157 | func (icp *icmpv6Parameters) escape() []canonICMPv6ParamRecord { |
| 158 | id := -1 |
| 159 | for i, r := range icp.Registries { |
| 160 | if strings.Contains(r.Title, "Type") || strings.Contains(r.Title, "type") { |
| 161 | id = i |
| 162 | break |
| 163 | } |
| 164 | } |
| 165 | if id < 0 { |
| 166 | return nil |
| 167 | } |
| 168 | prs := make([]canonICMPv6ParamRecord, len(icp.Registries[id].Records)) |
| 169 | sr := strings.NewReplacer( |
| 170 | "Messages", "", |
| 171 | "Message", "", |
| 172 | "ICMP", "", |
| 173 | "+", "P", |
| 174 | "-", "", |
| 175 | "/", "", |
| 176 | ".", "", |
| 177 | " ", "", |
| 178 | ) |
| 179 | for i, pr := range icp.Registries[id].Records { |
| 180 | if strings.Contains(pr.Name, "Reserved") || |
| 181 | strings.Contains(pr.Name, "Unassigned") || |
| 182 | strings.Contains(pr.Name, "Deprecated") || |
| 183 | strings.Contains(pr.Name, "Experiment") || |
| 184 | strings.Contains(pr.Name, "experiment") { |
| 185 | continue |
| 186 | } |
| 187 | ss := strings.Split(pr.Name, "\n") |
| 188 | if len(ss) > 1 { |
| 189 | prs[i].Name = strings.Join(ss, " ") |
| 190 | } else { |
| 191 | prs[i].Name = ss[0] |
| 192 | } |
| 193 | s := strings.TrimSpace(prs[i].Name) |
| 194 | prs[i].OrigName = s |
| 195 | prs[i].Name = sr.Replace(s) |
| 196 | prs[i].Value, _ = strconv.Atoi(pr.Value) |
| 197 | } |
| 198 | return prs |
| 199 | } |