Andrea Campanella | 7167ebb | 2020-02-24 09:56:38 +0100 | [diff] [blame^] | 1 | // Copyright 2012 Google, Inc. All rights reserved. |
| 2 | // |
| 3 | // Use of this source code is governed by a BSD-style license |
| 4 | // that can be found in the LICENSE file in the root of the source |
| 5 | // tree. |
| 6 | |
| 7 | // +build ignore |
| 8 | |
| 9 | // This binary pulls known ports from IANA, and uses them to populate |
| 10 | // iana_ports.go's TCPPortNames and UDPPortNames maps. |
| 11 | // |
| 12 | // go run gen.go | gofmt > iana_ports.go |
| 13 | package main |
| 14 | |
| 15 | import ( |
| 16 | "bytes" |
| 17 | "encoding/xml" |
| 18 | "flag" |
| 19 | "fmt" |
| 20 | "io/ioutil" |
| 21 | "net/http" |
| 22 | "os" |
| 23 | "strconv" |
| 24 | "time" |
| 25 | ) |
| 26 | |
| 27 | const fmtString = `// Copyright 2012 Google, Inc. All rights reserved. |
| 28 | |
| 29 | package layers |
| 30 | |
| 31 | // Created by gen.go, don't edit manually |
| 32 | // Generated at %s |
| 33 | // Fetched from %q |
| 34 | |
| 35 | // TCPPortNames contains the port names for all TCP ports. |
| 36 | var TCPPortNames = tcpPortNames |
| 37 | |
| 38 | // UDPPortNames contains the port names for all UDP ports. |
| 39 | var UDPPortNames = udpPortNames |
| 40 | |
| 41 | // SCTPPortNames contains the port names for all SCTP ports. |
| 42 | var SCTPPortNames = sctpPortNames |
| 43 | |
| 44 | var tcpPortNames = map[TCPPort]string{ |
| 45 | %s} |
| 46 | var udpPortNames = map[UDPPort]string{ |
| 47 | %s} |
| 48 | var sctpPortNames = map[SCTPPort]string{ |
| 49 | %s} |
| 50 | ` |
| 51 | |
| 52 | var url = flag.String("url", "http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xml", "URL to grab port numbers from") |
| 53 | |
| 54 | func main() { |
| 55 | fmt.Fprintf(os.Stderr, "Fetching ports from %q\n", *url) |
| 56 | resp, err := http.Get(*url) |
| 57 | if err != nil { |
| 58 | panic(err) |
| 59 | } |
| 60 | defer resp.Body.Close() |
| 61 | body, err := ioutil.ReadAll(resp.Body) |
| 62 | if err != nil { |
| 63 | panic(err) |
| 64 | } |
| 65 | fmt.Fprintln(os.Stderr, "Parsing XML") |
| 66 | var registry struct { |
| 67 | Records []struct { |
| 68 | Protocol string `xml:"protocol"` |
| 69 | Number string `xml:"number"` |
| 70 | Name string `xml:"name"` |
| 71 | } `xml:"record"` |
| 72 | } |
| 73 | xml.Unmarshal(body, ®istry) |
| 74 | var tcpPorts bytes.Buffer |
| 75 | var udpPorts bytes.Buffer |
| 76 | var sctpPorts bytes.Buffer |
| 77 | done := map[string]map[int]bool{ |
| 78 | "tcp": map[int]bool{}, |
| 79 | "udp": map[int]bool{}, |
| 80 | "sctp": map[int]bool{}, |
| 81 | } |
| 82 | for _, r := range registry.Records { |
| 83 | port, err := strconv.Atoi(r.Number) |
| 84 | if err != nil { |
| 85 | continue |
| 86 | } |
| 87 | if r.Name == "" { |
| 88 | continue |
| 89 | } |
| 90 | var b *bytes.Buffer |
| 91 | switch r.Protocol { |
| 92 | case "tcp": |
| 93 | b = &tcpPorts |
| 94 | case "udp": |
| 95 | b = &udpPorts |
| 96 | case "sctp": |
| 97 | b = &sctpPorts |
| 98 | default: |
| 99 | continue |
| 100 | } |
| 101 | if done[r.Protocol][port] { |
| 102 | continue |
| 103 | } |
| 104 | done[r.Protocol][port] = true |
| 105 | fmt.Fprintf(b, "\t%d: %q,\n", port, r.Name) |
| 106 | } |
| 107 | fmt.Fprintln(os.Stderr, "Writing results to stdout") |
| 108 | fmt.Printf(fmtString, time.Now(), *url, tcpPorts.String(), udpPorts.String(), sctpPorts.String()) |
| 109 | } |