cmd/client/main.go

   1 // VoRS -- Vo(IP) Really Simple
   2 // Copyright (C) 2024 Sergey Matveev <stargrave@stargrave.org>
   3 //
   4 // This program is free software: you can redistribute it and/or modify
   5 // it under the terms of the GNU Affero General Public License as
   6 // published by the Free Software Foundation, version 3 of the License.
   7 //
   8 // This program is distributed in the hope that it will be useful,
   9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 // GNU General Public License for more details.
  12 //
  13 // You should have received a copy of the GNU General Public License
  14 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15
  16 package main
  17
  18 import (
  19         "bufio"
  20         "bytes"
  21         "crypto/subtle"
  22         "crypto/tls"
  23         "crypto/x509"
  24         "encoding/binary"
  25         "encoding/hex"
  26         "errors"
  27         "flag"
  28         "fmt"
  29         "io"
  30         "log"
  31         "net"
  32         "net/netip"
  33         "os"
  34         "os/exec"
  35         "strconv"
  36         "strings"
  37         "time"
  38
  39         "github.com/jroimartin/gocui"
  40         vors "go.stargrave.org/vors/internal"
  41         "golang.org/x/crypto/blake2s"
  42         "golang.org/x/crypto/chacha20"
  43         "golang.org/x/crypto/poly1305"
  44         "gopkg.in/hraban/opus.v2"
  45 )
  46
  47 type Stream struct {
  48         name  string
  49         ctr   uint32
  50         in    chan []byte
  51         stats *Stats
  52 }
  53
  54 var (
  55         Streams  = map[byte]*Stream{}
  56         Finish   = make(chan struct{})
  57         OurStats = &Stats{dead: make(chan struct{})}
  58         Name     = flag.String("name", "test", "Username")
  59         Muted    bool
  60 )
  61
  62 func parseSID(s string) byte {
  63         n, err := strconv.Atoi(s)
  64         if err != nil {
  65                 log.Fatal(err)
  66         }
  67         if n > 255 {
  68                 log.Fatal("too big stream num")
  69         }
  70         return byte(n)
  71 }
  72
  73 func makeCmd(cmd string) *exec.Cmd {
  74         args := strings.Fields(cmd)
  75         if len(args) == 1 {
  76                 return exec.Command(args[0])
  77         }
  78         return exec.Command(args[0], args[1:]...)
  79 }
  80
  81 func incr(data []byte) {
  82         for i := len(data) - 1; i >= 0; i-- {
  83                 data[i]++
  84                 if data[i] != 0 {
  85                         return
  86                 }
  87         }
  88         panic("overflow")
  89 }
  90
  91 func main() {
  92         vadRaw := flag.Uint("vad", 0, "VAD threshold")
  93         hostport := flag.String("srv", "[::1]:12345", "TCP/UDP port to connect to")
  94         spkiHash := flag.String("spki", "FILL-ME", "SHA256 hash of server's certificate SPKI")
  95         passwd := flag.String("passwd", "", "Password")
  96         recCmd := flag.String("rec", "rec --no-show-progress --buffer 1920 --channels 1 --endian little --encoding signed --rate 48000 --bits 16 --type raw -", "rec command")
  97         playCmd := flag.String("play", "play --no-show-progress --buffer 1920 --channels 1 --endian little --encoding signed --rate 48000 --bits 16 --type raw -", "play command")
  98         flag.Parse()
  99         log.SetFlags(log.Lmicroseconds | log.Lshortfile)
 100
 101         vad := uint64(*vadRaw)
 102         opusEnc := newOpusEnc()
 103         var mic io.ReadCloser
 104         var err error
 105         if *recCmd != "" {
 106                 cmd := makeCmd(*recCmd)
 107                 mic, err = cmd.StdoutPipe()
 108                 if err != nil {
 109                         log.Fatal(err)
 110                 }
 111                 err = cmd.Start()
 112                 if err != nil {
 113                         log.Fatal(err)
 114                 }
 115         }
 116
 117         addrTCP, err := net.ResolveTCPAddr("tcp", *hostport)
 118         if err != nil {
 119                 log.Fatal(err)
 120         }
 121         addrUDP, err := net.ResolveUDPAddr("udp", *hostport)
 122         if err != nil {
 123                 log.Fatal(err)
 124         }
 125         ctrlRaw, err := net.DialTCP("tcp", nil, addrTCP)
 126         if err != nil {
 127                 log.Fatalln("dial server:", err)
 128         }
 129         defer ctrlRaw.Close()
 130         ourAddr := net.UDPAddrFromAddrPort(
 131                 netip.MustParseAddrPort(ctrlRaw.LocalAddr().String()))
 132         ln, err := net.ListenUDP("udp", ourAddr)
 133         if err != nil {
 134                 log.Fatal(err)
 135         }
 136         ctrl := tls.Client(ctrlRaw, &tls.Config{
 137                 MinVersion:         tls.VersionTLS13,
 138                 CurvePreferences:   []tls.CurveID{tls.X25519},
 139                 ServerName:         vors.CN,
 140                 InsecureSkipVerify: true,
 141                 VerifyPeerCertificate: func(
 142                         rawCerts [][]byte, verifiedChains [][]*x509.Certificate,
 143                 ) error {
 144                         cer, err := x509.ParseCertificate(rawCerts[0])
 145                         if err != nil {
 146                                 return err
 147                         }
 148                         if *spkiHash != vors.SPKIHash(cer) {
 149                                 return errors.New("server certificate's SPKI hash mismatch")
 150                         }
 151                         return nil
 152                 },
 153         })
 154         err = ctrl.Handshake()
 155         if err != nil {
 156                 log.Println("TLS handshake:", err)
 157                 return
 158         }
 159         defer ctrl.Close()
 160
 161         scanner := bufio.NewScanner(ctrl)
 162         if !scanner.Scan() {
 163                 log.Println("read challenge:", scanner.Err())
 164                 return
 165         }
 166         {
 167                 h, err := blake2s.New256([]byte(*passwd))
 168                 if err != nil {
 169                         log.Fatal(err)
 170                 }
 171                 h.Write(scanner.Bytes())
 172                 if _, err = io.Copy(ctrl, strings.NewReader(fmt.Sprintf(
 173                         "%s %s\n", hex.EncodeToString(h.Sum(nil)), *Name))); err != nil {
 174                         log.Println("write password:", err)
 175                         return
 176                 }
 177         }
 178         if !scanner.Scan() {
 179                 log.Println("auth", scanner.Err())
 180                 return
 181         }
 182         cols := strings.Fields(scanner.Text())
 183         if cols[0] != "OK" {
 184                 log.Println("auth failed:", scanner.Text())
 185                 return
 186         }
 187         sid := parseSID(cols[1])
 188         Streams[sid] = &Stream{name: *Name, stats: OurStats}
 189
 190         tlsState := ctrl.ConnectionState()
 191         keyOur, err := tlsState.ExportKeyingMaterial(cols[1], nil, chacha20.KeySize)
 192         if err != nil {
 193                 log.Fatal(err)
 194         }
 195         seen := time.Now()
 196
 197         LoggerReady := make(chan struct{})
 198         GUI, err = gocui.NewGui(gocui.OutputNormal)
 199         if err != nil {
 200                 log.Fatal(err)
 201         }
 202         defer GUI.Close()
 203         GUI.SelFgColor = gocui.ColorCyan
 204         GUI.Highlight = true
 205         GUI.SetManagerFunc(guiLayout)
 206         if err := GUI.SetKeybinding("", gocui.KeyF10, gocui.ModNone, guiQuit); err != nil {
 207                 log.Fatal(err)
 208         }
 209         if err := GUI.SetKeybinding("", gocui.KeyEnter, gocui.ModNone, mute); err != nil {
 210                 log.Fatal(err)
 211         }
 212
 213         go func() {
 214                 <-GUIReadyC
 215                 v, err := GUI.View("logs")
 216                 if err != nil {
 217                         log.Fatal(err)
 218                 }
 219                 log.SetOutput(v)
 220                 log.Println("connected")
 221                 close(LoggerReady)
 222                 for {
 223                         time.Sleep(vors.ScreenRefresh)
 224                         GUI.Update(func(gui *gocui.Gui) error {
 225                                 return nil
 226                         })
 227                 }
 228         }()
 229
 230         go func() {
 231                 <-Finish
 232                 go GUI.Close()
 233                 time.Sleep(100 * time.Millisecond)
 234                 os.Exit(0)
 235         }()
 236
 237         go func() {
 238                 var err error
 239                 for {
 240                         time.Sleep(vors.PingTime)
 241                         if _, err = ctrl.Write([]byte(vors.CmdPing + "\n")); err != nil {
 242                                 log.Println("ping:", err)
 243                                 Finish <- struct{}{}
 244                                 break
 245                         }
 246                 }
 247         }()
 248
 249         go func(seen *time.Time) {
 250                 var t string
 251                 var now time.Time
 252                 for scanner.Scan() {
 253                         t = scanner.Text()
 254                         if t == vors.CmdPong {
 255                                 now = time.Now()
 256                                 *seen = now
 257                                 continue
 258                         }
 259                         cols := strings.Fields(t)
 260                         switch cols[0] {
 261                         case vors.CmdAdd:
 262                                 sidRaw, name, keyHex := cols[1], cols[2], cols[3]
 263                                 log.Println("add", name)
 264                                 sid := parseSID(sidRaw)
 265                                 key, err := hex.DecodeString(keyHex)
 266                                 if err != nil {
 267                                         log.Fatal(err)
 268                                 }
 269                                 stream := &Stream{
 270                                         name:  name,
 271                                         in:    make(chan []byte, 1<<10),
 272                                         stats: &Stats{dead: make(chan struct{})},
 273                                 }
 274                                 go func() {
 275                                         dec, err := opus.NewDecoder(vors.Rate, 1)
 276                                         if err != nil {
 277                                                 log.Fatal(err)
 278                                         }
 279
 280                                         var player io.WriteCloser
 281                                         var cmd *exec.Cmd
 282                                         if *playCmd != "" {
 283                                                 cmd = makeCmd(*playCmd)
 284                                                 player, err = cmd.StdinPipe()
 285                                                 if err != nil {
 286                                                         log.Fatal(err)
 287                                                 }
 288                                                 err = cmd.Start()
 289                                                 if err != nil {
 290                                                         log.Fatal(err)
 291                                                 }
 292                                         }
 293
 294                                         var ciph *chacha20.Cipher
 295                                         var macKey [32]byte
 296                                         var mac *poly1305.MAC
 297                                         tag := make([]byte, poly1305.TagSize)
 298                                         var ctr uint32
 299                                         pcm := make([]int16, vors.FrameLen)
 300                                         pcmbuf := make([]byte, 2*vors.FrameLen)
 301                                         nonce := make([]byte, 12)
 302                                         var pkt []byte
 303                                         lost := -1
 304                                         var lastDur int
 305                                         for buf := range stream.in {
 306                                                 copy(nonce[len(nonce)-4:], buf)
 307                                                 ciph, err = chacha20.NewUnauthenticatedCipher(key, nonce)
 308                                                 if err != nil {
 309                                                         log.Fatal(err)
 310                                                 }
 311                                                 clear(macKey[:])
 312                                                 ciph.XORKeyStream(macKey[:], macKey[:])
 313                                                 ciph.SetCounter(1)
 314                                                 mac = poly1305.New(&macKey)
 315                                                 if _, err = mac.Write(buf[4 : len(buf)-vors.TagLen]); err != nil {
 316                                                         log.Fatal(err)
 317                                                 }
 318                                                 mac.Sum(tag[:0])
 319                                                 if subtle.ConstantTimeCompare(
 320                                                         tag[:vors.TagLen],
 321                                                         buf[len(buf)-vors.TagLen:],
 322                                                 ) != 1 {
 323                                                         log.Println("decrypt:", stream.name, "tag differs")
 324                                                         continue
 325                                                 }
 326                                                 pkt = buf[4 : len(buf)-vors.TagLen]
 327                                                 ciph.XORKeyStream(pkt, pkt)
 328
 329                                                 ctr = binary.BigEndian.Uint32(nonce[len(nonce)-4:])
 330                                                 if lost == -1 {
 331                                                         // ignore the very first packet in the stream
 332                                                         lost = 0
 333                                                 } else {
 334                                                         lost = int(ctr - (stream.ctr + 1))
 335                                                 }
 336                                                 stream.ctr = ctr
 337                                                 stream.stats.lost += int64(lost)
 338                                                 if lost > vors.MaxLost {
 339                                                         lost = 0
 340                                                 }
 341                                                 for ; lost > 0; lost-- {
 342                                                         lastDur, err = dec.LastPacketDuration()
 343                                                         if err != nil {
 344                                                                 log.Println("PLC:", err)
 345                                                                 continue
 346                                                         }
 347                                                         err = dec.DecodePLC(pcm[:lastDur])
 348                                                         if err != nil {
 349                                                                 log.Println("PLC:", err)
 350                                                                 continue
 351                                                         }
 352                                                         stream.stats.AddRMS(pcm)
 353                                                         if cmd == nil {
 354                                                                 continue
 355                                                         }
 356                                                         pcmConv(pcmbuf, pcm[:lastDur])
 357                                                         if _, err = io.Copy(player, bytes.NewReader(
 358                                                                 pcmbuf[:2*lastDur])); err != nil {
 359                                                                 log.Println("play:", err)
 360                                                         }
 361                                                 }
 362                                                 _, err = dec.Decode(pkt, pcm)
 363                                                 if err != nil {
 364                                                         log.Println("decode:", err)
 365                                                         continue
 366                                                 }
 367                                                 stream.stats.AddRMS(pcm)
 368                                                 stream.stats.last = time.Now()
 369                                                 if cmd == nil {
 370                                                         continue
 371                                                 }
 372                                                 pcmConv(pcmbuf, pcm)
 373                                                 if _, err = io.Copy(player,
 374                                                         bytes.NewReader(pcmbuf)); err != nil {
 375                                                         log.Println("play:", err)
 376                                                 }
 377                                         }
 378                                         if cmd != nil {
 379                                                 cmd.Process.Kill()
 380                                         }
 381                                 }()
 382                                 go statsDrawer(stream.stats, stream.name)
 383                                 Streams[sid] = stream
 384                         case vors.CmdDel:
 385                                 sid := parseSID(cols[1])
 386                                 s := Streams[sid]
 387                                 if s == nil {
 388                                         log.Println("unknown sid:", sid)
 389                                         continue
 390                                 }
 391                                 delete(Streams, sid)
 392                                 close(s.in)
 393                                 close(s.stats.dead)
 394                                 log.Println("del", s.name)
 395                         default:
 396                                 log.Fatal("unknown cmd:", cols[0])
 397                         }
 398                 }
 399                 if scanner.Err() != nil {
 400                         log.Print("scanner:", err)
 401                         Finish <- struct{}{}
 402                 }
 403         }(&seen)
 404
 405         go func(seen *time.Time) {
 406                 for now := range time.Tick(vors.PingTime) {
 407                         if seen.Add(2 * vors.PingTime).Before(now) {
 408                                 log.Println("timeout:", seen)
 409                                 Finish <- struct{}{}
 410                                 break
 411                         }
 412                 }
 413         }(&seen)
 414
 415         go func() {
 416                 <-LoggerReady
 417                 var n int
 418                 var from *net.UDPAddr
 419                 var err error
 420                 var stream *Stream
 421                 var ctr uint32
 422                 for {
 423                         buf := make([]byte, 2*vors.FrameLen)
 424                         n, from, err = ln.ReadFromUDP(buf)
 425                         if err != nil {
 426                                 log.Println("recvfrom:", err)
 427                                 Finish <- struct{}{}
 428                                 break
 429                         }
 430                         if from.Port != addrUDP.Port || !from.IP.Equal(addrUDP.IP) {
 431                                 log.Println("wrong addr:", from)
 432                                 continue
 433                         }
 434                         if n <= 4+vors.TagLen {
 435                                 log.Println("too small:", n)
 436                                 continue
 437                         }
 438                         stream = Streams[buf[0]]
 439                         if stream == nil {
 440                                 log.Println("unknown stream:", buf[0])
 441                                 continue
 442                         }
 443                         stream.stats.pkts++
 444                         stream.stats.bytes += uint64(n)
 445                         ctr = binary.BigEndian.Uint32(buf)
 446                         if ctr <= stream.ctr {
 447                                 stream.stats.reorder++
 448                                 continue
 449                         }
 450                         stream.in <- buf[:n]
 451                 }
 452         }()
 453
 454         go statsDrawer(OurStats, *Name)
 455         go func() {
 456                 <-LoggerReady
 457                 for {
 458                         OurStats.pkts++
 459                         OurStats.bytes += 1
 460                         if _, err = ln.WriteTo([]byte{sid}, addrUDP); err != nil {
 461                                 log.Println("send:", err)
 462                                 Finish <- struct{}{}
 463                         }
 464                         time.Sleep(time.Second)
 465                 }
 466         }()
 467         go func() {
 468                 if *recCmd == "" {
 469                         return
 470                 }
 471                 <-LoggerReady
 472                 var ciph *chacha20.Cipher
 473                 var macKey [32]byte
 474                 var mac *poly1305.MAC
 475                 tag := make([]byte, poly1305.TagSize)
 476                 buf := make([]byte, 2*vors.FrameLen)
 477                 pcm := make([]int16, vors.FrameLen)
 478                 nonce := make([]byte, 12)
 479                 nonce[len(nonce)-4] = sid
 480                 var pkt []byte
 481                 var n, i int
 482                 for {
 483                         _, err = io.ReadFull(mic, buf)
 484                         if err != nil {
 485                                 log.Println("mic:", err)
 486                                 break
 487                         }
 488                         if Muted {
 489                                 continue
 490                         }
 491                         for i = 0; i < vors.FrameLen; i++ {
 492                                 pcm[i] = int16(uint16(buf[i*2+0]) | (uint16(buf[i*2+1]) << 8))
 493                         }
 494                         if vad != 0 && vors.RMS(pcm) < vad {
 495                                 continue
 496                         }
 497                         n, err = opusEnc.Encode(pcm, buf[4:])
 498                         if err != nil {
 499                                 log.Fatal(err)
 500                         }
 501
 502                         incr(nonce[len(nonce)-3:])
 503                         copy(buf, nonce[len(nonce)-4:])
 504                         ciph, err = chacha20.NewUnauthenticatedCipher(keyOur, nonce)
 505                         if err != nil {
 506                                 log.Fatal(err)
 507                         }
 508                         clear(macKey[:])
 509                         ciph.XORKeyStream(macKey[:], macKey[:])
 510                         ciph.SetCounter(1)
 511                         ciph.XORKeyStream(buf[4:4+n], buf[4:4+n])
 512                         mac = poly1305.New(&macKey)
 513                         if _, err = mac.Write(buf[4 : 4+n]); err != nil {
 514                                 log.Fatal(err)
 515                         }
 516                         mac.Sum(tag[:0])
 517                         copy(buf[4+n:], tag[:vors.TagLen])
 518                         pkt = buf[:4+n+vors.TagLen]
 519
 520                         OurStats.pkts++
 521                         OurStats.bytes += uint64(len(pkt))
 522                         OurStats.last = time.Now()
 523                         OurStats.AddRMS(pcm)
 524                         if _, err = ln.WriteTo(pkt, addrUDP); err != nil {
 525                                 log.Println("send:", err)
 526                                 break
 527                         }
 528                 }
 529         }()
 530
 531         err = GUI.MainLoop()
 532         if err != nil && err != gocui.ErrQuit {
 533                 log.Fatal(err)
 534         }
 535 }