| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "flag" |
| 5 | "fmt" |
| 6 | "io" |
| 7 | "os" |
| 8 | "strconv" |
| 9 | |
| 10 | ma "github.com/multiformats/go-multiaddr" |
| 11 | manet "github.com/multiformats/go-multiaddr/net" |
| 12 | ) |
| 13 | |
| 14 | const USAGE = "ma-pipe-unidir [-l|--listen] [--pidFile=path] [-h|--help] <send|recv> <multiaddr>\n" |
| 15 | |
| 16 | type Opts struct { |
| 17 | Listen bool |
| 18 | PidFile string |
| 19 | } |
| 20 | |
| 21 | func app() int { |
| 22 | opts := Opts{} |
| 23 | flag.BoolVar(&opts.Listen, "l", false, "") |
| 24 | flag.BoolVar(&opts.Listen, "listen", false, "") |
| 25 | flag.StringVar(&opts.PidFile, "pidFile", "", "") |
| 26 | flag.Usage = func() { |
| 27 | fmt.Print(USAGE) |
| 28 | } |
| 29 | flag.Parse() |
| 30 | args := flag.Args() |
| 31 | |
| 32 | if len(args) < 2 { // <mode> <addr> |
| 33 | fmt.Print(USAGE) |
| 34 | return 1 |
| 35 | } |
| 36 | |
| 37 | mode := args[0] |
| 38 | addr := args[1] |
| 39 | |
| 40 | if mode != "send" && mode != "recv" { |
| 41 | fmt.Print(USAGE) |
| 42 | return 1 |
| 43 | } |
| 44 | |
| 45 | maddr, err := ma.NewMultiaddr(addr) |
| 46 | if err != nil { |
| 47 | return 1 |
| 48 | } |
| 49 | |
| 50 | var conn manet.Conn |
| 51 | |
| 52 | if opts.Listen { |
| 53 | listener, err := manet.Listen(maddr) |
| 54 | if err != nil { |
| 55 | return 1 |
| 56 | } |
| 57 | |
| 58 | if len(opts.PidFile) > 0 { |
| 59 | data := []byte(strconv.Itoa(os.Getpid())) |
| 60 | err := os.WriteFile(opts.PidFile, data, 0o644) |
| 61 | if err != nil { |
| 62 | return 1 |
| 63 | } |
| 64 | |
| 65 | defer os.Remove(opts.PidFile) |
| 66 | } |
| 67 | |
| 68 | conn, err = listener.Accept() |
| 69 | if err != nil { |
| 70 | return 1 |
| 71 | } |
| 72 | } else { |
| 73 | var err error |
| 74 | conn, err = manet.Dial(maddr) |
| 75 | if err != nil { |
| 76 | return 1 |
| 77 | } |
| 78 | |
| 79 | if len(opts.PidFile) > 0 { |
| 80 | data := []byte(strconv.Itoa(os.Getpid())) |
| 81 | err := os.WriteFile(opts.PidFile, data, 0o644) |
| 82 | if err != nil { |
| 83 | return 1 |
| 84 | } |
| 85 | |
| 86 | defer os.Remove(opts.PidFile) |
| 87 | } |
| 88 | |
| 89 | } |
| 90 | |
| 91 | defer conn.Close() |
| 92 | switch mode { |
| 93 | case "recv": |
| 94 | _, err = io.Copy(os.Stdout, conn) |
| 95 | case "send": |
| 96 | _, err = io.Copy(conn, os.Stdin) |
| 97 | default: |
| 98 | return 1 |
| 99 | } |
| 100 | if err != nil { |
| 101 | return 1 |
| 102 | } |
| 103 | return 0 |
| 104 | } |
| 105 | |
| 106 | func main() { |
| 107 | os.Exit(app()) |
| 108 | } |