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         "bytes"
  20         "crypto/subtle"
  21         "encoding/binary"
  22         "encoding/hex"
  23         "flag"
  24         "io"
  25         "log"
  26         "net"
  27         "os"
  28         "os/exec"
  29         "strconv"
  30         "strings"
  31         "time"
  32
  33         "github.com/flynn/noise"
  34         "github.com/jroimartin/gocui"
  35         vors "go.stargrave.org/vors/internal"
  36         "golang.org/x/crypto/blake2s"
  37         "golang.org/x/crypto/chacha20"
  38         "golang.org/x/crypto/poly1305"
  39         "gopkg.in/hraban/opus.v2"
  40 )
  41
  42 type Stream struct {
  43         name  string
  44         ctr   uint32
  45         in    chan []byte
  46         stats *Stats
  47 }
  48
  49 var (
  50         Streams  = map[byte]*Stream{}
  51         Finish   = make(chan struct{})
  52         OurStats = &Stats{dead: make(chan struct{})}
  53         Name     = flag.String("name", "test", "Username")
  54         Muted    bool
  55 )
  56
  57 func parseSID(s string) byte {
  58         n, err := strconv.Atoi(s)
  59         if err != nil {
  60                 log.Fatal(err)
  61         }
  62         if n > 255 {
  63                 log.Fatal("too big stream num")
  64         }
  65         return byte(n)
  66 }
  67
  68 func makeCmd(cmd string) *exec.Cmd {
  69         args := strings.Fields(cmd)
  70         if len(args) == 1 {
  71                 return exec.Command(args[0])
  72         }
  73         return exec.Command(args[0], args[1:]...)
  74 }
  75
  76 func incr(data []byte) {
  77         for i := len(data) - 1; i >= 0; i-- {
  78                 data[i]++
  79                 if data[i] != 0 {
  80                         return
  81                 }
  82         }
  83         panic("overflow")
  84 }
  85
  86 const soxParams = "--no-show-progress --buffer 1920 --channels 1 --endian little --encoding signed --rate 48000 --bits 16 --type raw -"
  87
  88 func main() {
  89         srvAddr := flag.String("srv", "vors.home.arpa:"+strconv.Itoa(vors.DefaultPort),
  90                 "Host:TCP/UDP port to connect to")
  91         srvPubHex := flag.String("pub", "", "Server's public key, hex")
  92         recCmd := flag.String("rec", "rec "+soxParams, "rec command")
  93         playCmd := flag.String("play", "play "+soxParams, "play command")
  94         vadRaw := flag.Uint("vad", 0, "VAD threshold")
  95         flag.Parse()
  96         log.SetFlags(log.Lmicroseconds | log.Lshortfile)
  97
  98         srvPub, err := hex.DecodeString(*srvPubHex)
  99         if err != nil {
 100                 log.Fatal(err)
 101         }
 102
 103         vad := uint64(*vadRaw)
 104         opusEnc := newOpusEnc()
 105         var mic io.ReadCloser
 106         if *recCmd != "" {
 107                 cmd := makeCmd(*recCmd)
 108                 mic, err = cmd.StdoutPipe()
 109                 if err != nil {
 110                         log.Fatal(err)
 111                 }
 112                 err = cmd.Start()
 113                 if err != nil {
 114                         log.Fatal(err)
 115                 }
 116         }
 117
 118         ctrl, err := net.DialTCP("tcp", nil, vors.MustResolveTCP(*srvAddr))
 119         if err != nil {
 120                 log.Fatalln("dial server:", err)
 121         }
 122         defer ctrl.Close()
 123         if err = ctrl.SetNoDelay(true); err != nil {
 124                 log.Fatalln("nodelay:", err)
 125         }
 126         if _, err = io.Copy(ctrl, strings.NewReader(vors.NoisePrologue)); err != nil {
 127                 log.Fatalln("handshake: write prologue", err)
 128                 return
 129         }
 130
 131         hs, err := noise.NewHandshakeState(noise.Config{
 132                 CipherSuite: vors.NoiseCipherSuite,
 133                 Pattern:     noise.HandshakeNK,
 134                 Initiator:   true,
 135                 PeerStatic:  srvPub,
 136                 Prologue:    []byte(vors.NoisePrologue),
 137         })
 138         if err != nil {
 139                 log.Fatalln("noise.NewHandshakeState:", err)
 140         }
 141         buf, _, _, err := hs.WriteMessage(nil, []byte(*Name))
 142         if err != nil {
 143                 log.Fatalln("handshake encrypt:", err)
 144         }
 145         if err = vors.PktWrite(ctrl, buf); err != nil {
 146                 log.Fatalln("write handshake:", err)
 147                 return
 148         }
 149         buf, err = vors.PktRead(ctrl)
 150         if err != nil {
 151                 log.Fatalln("read handshake:", err)
 152         }
 153         buf, txCS, rxCS, err := hs.ReadMessage(nil, buf)
 154         if err != nil {
 155                 log.Fatalln("handshake decrypt:", err)
 156         }
 157
 158         rx := make(chan []byte)
 159         go func() {
 160                 for {
 161                         buf, err := vors.PktRead(ctrl)
 162                         if err != nil {
 163                                 log.Println("rx", err)
 164                                 break
 165                         }
 166                         buf, err = rxCS.Decrypt(buf[:0], nil, buf)
 167                         if err != nil {
 168                                 log.Println("rx decrypt", err)
 169                                 break
 170                         }
 171                         rx <- buf
 172                 }
 173                 Finish <- struct{}{}
 174         }()
 175
 176         srvAddrUDP := vors.MustResolveUDP(*srvAddr)
 177         conn, err := net.DialUDP("udp", nil, srvAddrUDP)
 178         if err != nil {
 179                 log.Fatalln("connect:", err)
 180         }
 181         var sid byte
 182         {
 183                 cols := strings.Fields(string(buf))
 184                 if cols[0] != "OK" || len(cols) != 2 {
 185                         log.Fatalln("handshake failed:", cols)
 186                 }
 187                 var cookie vors.Cookie
 188                 cookieRaw, err := hex.DecodeString(cols[1])
 189                 if err != nil {
 190                         log.Fatal(err)
 191                 }
 192                 copy(cookie[:], cookieRaw)
 193                 timeout := time.NewTimer(vors.PingTime)
 194                 defer func() {
 195                         if !timeout.Stop() {
 196                                 <-timeout.C
 197                         }
 198                 }()
 199                 ticker := time.NewTicker(time.Second)
 200                 if _, err = conn.Write(cookie[:]); err != nil {
 201                         log.Fatalln("write:", err)
 202                 }
 203         WaitForCookieAcceptance:
 204                 for {
 205                         select {
 206                         case <-timeout.C:
 207                                 log.Fatalln("cookie acceptance timeout")
 208                         case <-ticker.C:
 209                                 if _, err = conn.Write(cookie[:]); err != nil {
 210                                         log.Fatalln("write:", err)
 211                                 }
 212                         case buf = <-rx:
 213                                 cols = strings.Fields(string(buf))
 214                                 if cols[0] != "SID" || len(cols) != 2 {
 215                                         log.Fatalln("cookie acceptance failed:", string(buf))
 216                                 }
 217                                 sid = parseSID(cols[1])
 218                                 Streams[sid] = &Stream{name: *Name, stats: OurStats}
 219                                 break WaitForCookieAcceptance
 220                         }
 221                 }
 222                 if !timeout.Stop() {
 223                         <-timeout.C
 224                 }
 225         }
 226
 227         var keyOur []byte
 228         {
 229                 h, err := blake2s.New256(hs.ChannelBinding())
 230                 if err != nil {
 231                         log.Fatalln(err)
 232                 }
 233                 h.Write([]byte(vors.NoisePrologue))
 234                 keyOur = h.Sum(nil)
 235         }
 236
 237         seen := time.Now()
 238
 239         LoggerReady := make(chan struct{})
 240         GUI, err = gocui.NewGui(gocui.OutputNormal)
 241         if err != nil {
 242                 log.Fatal(err)
 243         }
 244         defer GUI.Close()
 245         GUI.SelFgColor = gocui.ColorCyan
 246         GUI.Highlight = true
 247         GUI.SetManagerFunc(guiLayout)
 248         if err := GUI.SetKeybinding("", gocui.KeyF10, gocui.ModNone, guiQuit); err != nil {
 249                 log.Fatal(err)
 250         }
 251         if err := GUI.SetKeybinding("", gocui.KeyEnter, gocui.ModNone, mute); err != nil {
 252                 log.Fatal(err)
 253         }
 254
 255         go func() {
 256                 <-GUIReadyC
 257                 v, err := GUI.View("logs")
 258                 if err != nil {
 259                         log.Fatal(err)
 260                 }
 261                 log.SetOutput(v)
 262                 log.Println("connected", "sid:", sid,
 263                         "addr:", conn.LocalAddr().String())
 264                 close(LoggerReady)
 265                 for {
 266                         time.Sleep(vors.ScreenRefresh)
 267                         GUI.Update(func(gui *gocui.Gui) error {
 268                                 return nil
 269                         })
 270                 }
 271         }()
 272
 273         go func() {
 274                 <-Finish
 275                 go GUI.Close()
 276                 time.Sleep(100 * time.Millisecond)
 277                 os.Exit(0)
 278         }()
 279
 280         go func() {
 281                 for {
 282                         time.Sleep(vors.PingTime)
 283                         buf, err := txCS.Encrypt(nil, nil, []byte(vors.CmdPing))
 284                         if err != nil {
 285                                 log.Fatalln("tx encrypt:", err)
 286                         }
 287                         if err = vors.PktWrite(ctrl, buf); err != nil {
 288                                 log.Fatalln("tx:", err)
 289                         }
 290                 }
 291         }()
 292
 293         go func(seen *time.Time) {
 294                 var now time.Time
 295                 for buf := range rx {
 296                         if string(buf) == vors.CmdPong {
 297                                 now = time.Now()
 298                                 *seen = now
 299                                 continue
 300                         }
 301                         cols := strings.Fields(string(buf))
 302                         switch cols[0] {
 303                         case vors.CmdAdd:
 304                                 sidRaw, name, keyHex := cols[1], cols[2], cols[3]
 305                                 log.Println("add", name, "sid:", sidRaw)
 306                                 sid := parseSID(sidRaw)
 307                                 key, err := hex.DecodeString(keyHex)
 308                                 if err != nil {
 309                                         log.Fatal(err)
 310                                 }
 311                                 stream := &Stream{
 312                                         name:  name,
 313                                         in:    make(chan []byte, 1<<10),
 314                                         stats: &Stats{dead: make(chan struct{})},
 315                                 }
 316                                 go func() {
 317                                         dec, err := opus.NewDecoder(vors.Rate, 1)
 318                                         if err != nil {
 319                                                 log.Fatal(err)
 320                                         }
 321
 322                                         var player io.WriteCloser
 323                                         var cmd *exec.Cmd
 324                                         if *playCmd != "" {
 325                                                 cmd = makeCmd(*playCmd)
 326                                                 player, err = cmd.StdinPipe()
 327                                                 if err != nil {
 328                                                         log.Fatal(err)
 329                                                 }
 330                                                 err = cmd.Start()
 331                                                 if err != nil {
 332                                                         log.Fatal(err)
 333                                                 }
 334                                         }
 335
 336                                         var ciph *chacha20.Cipher
 337                                         var macKey [32]byte
 338                                         var mac *poly1305.MAC
 339                                         tag := make([]byte, poly1305.TagSize)
 340                                         var ctr uint32
 341                                         pcm := make([]int16, vors.FrameLen)
 342                                         pcmbuf := make([]byte, 2*vors.FrameLen)
 343                                         nonce := make([]byte, 12)
 344                                         var pkt []byte
 345                                         lost := -1
 346                                         var lastDur int
 347                                         for buf := range stream.in {
 348                                                 copy(nonce[len(nonce)-4:], buf)
 349                                                 ciph, err = chacha20.NewUnauthenticatedCipher(key, nonce)
 350                                                 if err != nil {
 351                                                         log.Fatal(err)
 352                                                 }
 353                                                 clear(macKey[:])
 354                                                 ciph.XORKeyStream(macKey[:], macKey[:])
 355                                                 ciph.SetCounter(1)
 356                                                 mac = poly1305.New(&macKey)
 357                                                 if _, err = mac.Write(buf[4 : len(buf)-vors.TagLen]); err != nil {
 358                                                         log.Fatal(err)
 359                                                 }
 360                                                 mac.Sum(tag[:0])
 361                                                 if subtle.ConstantTimeCompare(
 362                                                         tag[:vors.TagLen],
 363                                                         buf[len(buf)-vors.TagLen:],
 364                                                 ) != 1 {
 365                                                         log.Println("decrypt:", stream.name, "tag differs")
 366                                                         continue
 367                                                 }
 368                                                 pkt = buf[4 : len(buf)-vors.TagLen]
 369                                                 ciph.XORKeyStream(pkt, pkt)
 370
 371                                                 ctr = binary.BigEndian.Uint32(nonce[len(nonce)-4:])
 372                                                 if lost == -1 {
 373                                                         // ignore the very first packet in the stream
 374                                                         lost = 0
 375                                                 } else {
 376                                                         lost = int(ctr - (stream.ctr + 1))
 377                                                 }
 378                                                 stream.ctr = ctr
 379                                                 stream.stats.lost += int64(lost)
 380                                                 if lost > vors.MaxLost {
 381                                                         lost = 0
 382                                                 }
 383                                                 for ; lost > 0; lost-- {
 384                                                         lastDur, err = dec.LastPacketDuration()
 385                                                         if err != nil {
 386                                                                 log.Println("PLC:", err)
 387                                                                 continue
 388                                                         }
 389                                                         err = dec.DecodePLC(pcm[:lastDur])
 390                                                         if err != nil {
 391                                                                 log.Println("PLC:", err)
 392                                                                 continue
 393                                                         }
 394                                                         stream.stats.AddRMS(pcm)
 395                                                         if cmd == nil {
 396                                                                 continue
 397                                                         }
 398                                                         pcmConv(pcmbuf, pcm[:lastDur])
 399                                                         if _, err = io.Copy(player, bytes.NewReader(
 400                                                                 pcmbuf[:2*lastDur])); err != nil {
 401                                                                 log.Println("play:", err)
 402                                                         }
 403                                                 }
 404                                                 _, err = dec.Decode(pkt, pcm)
 405                                                 if err != nil {
 406                                                         log.Println("decode:", err)
 407                                                         continue
 408                                                 }
 409                                                 stream.stats.AddRMS(pcm)
 410                                                 stream.stats.last = time.Now()
 411                                                 if cmd == nil {
 412                                                         continue
 413                                                 }
 414                                                 pcmConv(pcmbuf, pcm)
 415                                                 if _, err = io.Copy(player,
 416                                                         bytes.NewReader(pcmbuf)); err != nil {
 417                                                         log.Println("play:", err)
 418                                                 }
 419                                         }
 420                                         if cmd != nil {
 421                                                 cmd.Process.Kill()
 422                                         }
 423                                 }()
 424                                 go statsDrawer(stream.stats, stream.name)
 425                                 Streams[sid] = stream
 426                         case vors.CmdDel:
 427                                 sid := parseSID(cols[1])
 428                                 s := Streams[sid]
 429                                 if s == nil {
 430                                         log.Println("unknown sid:", sid)
 431                                         continue
 432                                 }
 433                                 log.Println("del", s.name, "sid:", cols[1])
 434                                 delete(Streams, sid)
 435                                 close(s.in)
 436                                 close(s.stats.dead)
 437                         default:
 438                                 log.Fatal("unknown cmd:", cols[0])
 439                         }
 440                 }
 441         }(&seen)
 442
 443         go func(seen *time.Time) {
 444                 for now := range time.Tick(vors.PingTime) {
 445                         if seen.Add(2 * vors.PingTime).Before(now) {
 446                                 log.Println("timeout:", seen)
 447                                 Finish <- struct{}{}
 448                                 break
 449                         }
 450                 }
 451         }(&seen)
 452
 453         go func() {
 454                 <-LoggerReady
 455                 var n int
 456                 var from *net.UDPAddr
 457                 var err error
 458                 var stream *Stream
 459                 var ctr uint32
 460                 for {
 461                         buf := make([]byte, 2*vors.FrameLen)
 462                         n, from, err = conn.ReadFromUDP(buf)
 463                         if err != nil {
 464                                 log.Println("recvfrom:", err)
 465                                 Finish <- struct{}{}
 466                                 break
 467                         }
 468                         if from.Port != srvAddrUDP.Port || !from.IP.Equal(srvAddrUDP.IP) {
 469                                 log.Println("wrong addr:", from)
 470                                 continue
 471                         }
 472                         if n <= 4+vors.TagLen {
 473                                 log.Println("too small:", n)
 474                                 continue
 475                         }
 476                         stream = Streams[buf[0]]
 477                         if stream == nil {
 478                                 // log.Println("unknown stream:", buf[0])
 479                                 continue
 480                         }
 481                         stream.stats.pkts++
 482                         stream.stats.bytes += uint64(n)
 483                         ctr = binary.BigEndian.Uint32(buf)
 484                         if ctr <= stream.ctr {
 485                                 stream.stats.reorder++
 486                                 continue
 487                         }
 488                         stream.in <- buf[:n]
 489                 }
 490         }()
 491
 492         go statsDrawer(OurStats, *Name)
 493         go func() {
 494                 <-LoggerReady
 495                 for {
 496                         OurStats.pkts++
 497                         OurStats.bytes += 1
 498                         if _, err = conn.Write([]byte{sid}); err != nil {
 499                                 log.Println("send:", err)
 500                                 Finish <- struct{}{}
 501                         }
 502                         time.Sleep(time.Second)
 503                 }
 504         }()
 505         go func() {
 506                 if *recCmd == "" {
 507                         return
 508                 }
 509                 <-LoggerReady
 510                 var ciph *chacha20.Cipher
 511                 var macKey [32]byte
 512                 var mac *poly1305.MAC
 513                 tag := make([]byte, poly1305.TagSize)
 514                 buf := make([]byte, 2*vors.FrameLen)
 515                 pcm := make([]int16, vors.FrameLen)
 516                 nonce := make([]byte, 12)
 517                 nonce[len(nonce)-4] = sid
 518                 var pkt []byte
 519                 var n, i int
 520                 for {
 521                         _, err = io.ReadFull(mic, buf)
 522                         if err != nil {
 523                                 log.Println("mic:", err)
 524                                 break
 525                         }
 526                         if Muted {
 527                                 continue
 528                         }
 529                         for i = 0; i < vors.FrameLen; i++ {
 530                                 pcm[i] = int16(uint16(buf[i*2+0]) | (uint16(buf[i*2+1]) << 8))
 531                         }
 532                         if vad != 0 && vors.RMS(pcm) < vad {
 533                                 continue
 534                         }
 535                         n, err = opusEnc.Encode(pcm, buf[4:])
 536                         if err != nil {
 537                                 log.Fatal(err)
 538                         }
 539                         if n <= 2 {
 540                                 // DTX
 541                                 continue
 542                         }
 543
 544                         incr(nonce[len(nonce)-3:])
 545                         copy(buf, nonce[len(nonce)-4:])
 546                         ciph, err = chacha20.NewUnauthenticatedCipher(keyOur, nonce)
 547                         if err != nil {
 548                                 log.Fatal(err)
 549                         }
 550                         clear(macKey[:])
 551                         ciph.XORKeyStream(macKey[:], macKey[:])
 552                         ciph.SetCounter(1)
 553                         ciph.XORKeyStream(buf[4:4+n], buf[4:4+n])
 554                         mac = poly1305.New(&macKey)
 555                         if _, err = mac.Write(buf[4 : 4+n]); err != nil {
 556                                 log.Fatal(err)
 557                         }
 558                         mac.Sum(tag[:0])
 559                         copy(buf[4+n:], tag[:vors.TagLen])
 560                         pkt = buf[:4+n+vors.TagLen]
 561
 562                         OurStats.pkts++
 563                         OurStats.bytes += uint64(len(pkt))
 564                         OurStats.last = time.Now()
 565                         OurStats.AddRMS(pcm)
 566                         if _, err = conn.Write(pkt); err != nil {
 567                                 log.Println("send:", err)
 568                                 break
 569                         }
 570                 }
 571         }()
 572
 573         err = GUI.MainLoop()
 574         if err != nil && err != gocui.ErrQuit {
 575                 log.Fatal(err)
 576         }
 577 }