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 Affero General Public License for more details.
  12 //
  13 // You should have received a copy of the GNU Affero 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/base64"
  22         "encoding/binary"
  23         "encoding/hex"
  24         "flag"
  25         "fmt"
  26         "io"
  27         "log"
  28         "net"
  29         "os"
  30         "os/exec"
  31         "strconv"
  32         "strings"
  33         "time"
  34
  35         "github.com/dchest/siphash"
  36         "github.com/flynn/noise"
  37         "github.com/jroimartin/gocui"
  38         "go.stargrave.org/opus/v2"
  39         vors "go.stargrave.org/vors/internal"
  40         "golang.org/x/crypto/blake2s"
  41         "golang.org/x/crypto/chacha20"
  42 )
  43
  44 type Stream struct {
  45         name  string
  46         ctr   uint32
  47         in    chan []byte
  48         stats *Stats
  49 }
  50
  51 var (
  52         Streams  = map[byte]*Stream{}
  53         Finish   = make(chan struct{})
  54         OurStats = &Stats{dead: make(chan struct{})}
  55         Name     = flag.String("name", "test", "username")
  56         Room     = flag.String("room", "/", "room name")
  57         Muted    bool
  58 )
  59
  60 func parseSID(s string) byte {
  61         n, err := strconv.Atoi(s)
  62         if err != nil {
  63                 log.Fatal(err)
  64         }
  65         if n > 255 {
  66                 log.Fatal("too big stream num")
  67         }
  68         return byte(n)
  69 }
  70
  71 func makeCmd(cmd string) *exec.Cmd {
  72         args := strings.Fields(cmd)
  73         if len(args) == 1 {
  74                 return exec.Command(args[0])
  75         }
  76         return exec.Command(args[0], args[1:]...)
  77 }
  78
  79 func incr(data []byte) {
  80         for i := len(data) - 1; i >= 0; i-- {
  81                 data[i]++
  82                 if data[i] != 0 {
  83                         return
  84                 }
  85         }
  86         panic("overflow")
  87 }
  88
  89 const soxParams = "--no-show-progress --buffer 1920 --channels 1 --endian little --encoding signed --rate 48000 --bits 16 --type raw -"
  90
  91 func main() {
  92         srvAddr := flag.String("srv", "vors.home.arpa:"+strconv.Itoa(vors.DefaultPort),
  93                 "host:TCP/UDP port to connect to")
  94         srvPubB64 := flag.String("pub", "", "server's public key, Base64")
  95         recCmd := flag.String("rec", "rec "+soxParams, "rec command")
  96         playCmd := flag.String("play", "play "+soxParams, "play command")
  97         vadRaw := flag.Uint("vad", 0, "VAD threshold")
  98         passwd := flag.String("passwd", "", "protected room's password")
  99         muteToggle := flag.String("mute-toggle", "", "path to FIFO to toggle mute")
 100         version := flag.Bool("version", false, "print version")
 101         warranty := flag.Bool("warranty", false, "print warranty information")
 102         flag.Parse()
 103         log.SetFlags(log.Lmicroseconds | log.Lshortfile)
 104
 105         if *warranty {
 106                 fmt.Println(vors.Warranty)
 107                 return
 108         }
 109         if *version {
 110                 fmt.Println(vors.GetVersion())
 111                 return
 112         }
 113
 114         srvPub, err := base64.RawURLEncoding.DecodeString(*srvPubB64)
 115         if err != nil {
 116                 log.Fatal(err)
 117         }
 118         *Name = strings.ReplaceAll(*Name, " ", "-")
 119
 120         go func() {
 121                 if *muteToggle == "" {
 122                         return
 123                 }
 124                 for {
 125                         fd, err := os.OpenFile(*muteToggle, os.O_WRONLY, os.FileMode(0666))
 126                         if err != nil {
 127                                 log.Fatalln(err)
 128                         }
 129                         Muted = !Muted
 130                         var reply string
 131                         if Muted {
 132                                 reply = "muted"
 133                         } else {
 134                                 reply = "unmuted"
 135                         }
 136                         fd.WriteString(reply + "\n")
 137                         fd.Close()
 138                         time.Sleep(time.Second)
 139                 }
 140         }()
 141
 142         vad := uint64(*vadRaw)
 143         opusEnc := newOpusEnc()
 144         var mic io.ReadCloser
 145         if *recCmd != "" {
 146                 cmd := makeCmd(*recCmd)
 147                 mic, err = cmd.StdoutPipe()
 148                 if err != nil {
 149                         log.Fatal(err)
 150                 }
 151                 err = cmd.Start()
 152                 if err != nil {
 153                         log.Fatal(err)
 154                 }
 155         }
 156
 157         ctrl, err := net.DialTCP("tcp", nil, vors.MustResolveTCP(*srvAddr))
 158         if err != nil {
 159                 log.Fatalln("dial server:", err)
 160         }
 161         defer ctrl.Close()
 162         if err = ctrl.SetNoDelay(true); err != nil {
 163                 log.Fatalln("nodelay:", err)
 164         }
 165
 166         hs, err := noise.NewHandshakeState(noise.Config{
 167                 CipherSuite: vors.NoiseCipherSuite,
 168                 Pattern:     noise.HandshakeNK,
 169                 Initiator:   true,
 170                 PeerStatic:  srvPub,
 171                 Prologue:    []byte(vors.NoisePrologue),
 172         })
 173         if err != nil {
 174                 log.Fatalln("noise.NewHandshakeState:", err)
 175         }
 176         buf, _, _, err := hs.WriteMessage(nil, []byte(*Name+" "+*Room+" "+*passwd))
 177         if err != nil {
 178                 log.Fatalln("handshake encrypt:", err)
 179         }
 180         buf = append(
 181                 append(
 182                         []byte(vors.NoisePrologue),
 183                         byte((len(buf)&0xFF00)>>8),
 184                         byte((len(buf)&0x00FF)>>0),
 185                 ),
 186                 buf...,
 187         )
 188         _, err = io.Copy(ctrl, bytes.NewReader(buf))
 189         if err != nil {
 190                 log.Fatalln("write handshake:", err)
 191                 return
 192         }
 193         buf, err = vors.PktRead(ctrl)
 194         if err != nil {
 195                 log.Fatalln("read handshake:", err)
 196         }
 197         buf, txCS, rxCS, err := hs.ReadMessage(nil, buf)
 198         if err != nil {
 199                 log.Fatalln("handshake decrypt:", err)
 200         }
 201
 202         rx := make(chan []byte)
 203         go func() {
 204                 for {
 205                         buf, err := vors.PktRead(ctrl)
 206                         if err != nil {
 207                                 log.Println("rx", err)
 208                                 break
 209                         }
 210                         buf, err = rxCS.Decrypt(buf[:0], nil, buf)
 211                         if err != nil {
 212                                 log.Println("rx decrypt", err)
 213                                 break
 214                         }
 215                         rx <- buf
 216                 }
 217                 Finish <- struct{}{}
 218         }()
 219
 220         srvAddrUDP := vors.MustResolveUDP(*srvAddr)
 221         conn, err := net.DialUDP("udp", nil, srvAddrUDP)
 222         if err != nil {
 223                 log.Fatalln("connect:", err)
 224         }
 225         var sid byte
 226         {
 227                 cols := strings.Fields(string(buf))
 228                 if cols[0] != "OK" || len(cols) != 2 {
 229                         log.Fatalln("handshake failed:", cols)
 230                 }
 231                 var cookie vors.Cookie
 232                 cookieRaw, err := hex.DecodeString(cols[1])
 233                 if err != nil {
 234                         log.Fatal(err)
 235                 }
 236                 copy(cookie[:], cookieRaw)
 237                 timeout := time.NewTimer(vors.PingTime)
 238                 defer func() {
 239                         if !timeout.Stop() {
 240                                 <-timeout.C
 241                         }
 242                 }()
 243                 ticker := time.NewTicker(time.Second)
 244                 if _, err = conn.Write(cookie[:]); err != nil {
 245                         log.Fatalln("write:", err)
 246                 }
 247         WaitForCookieAcceptance:
 248                 for {
 249                         select {
 250                         case <-timeout.C:
 251                                 log.Fatalln("cookie acceptance timeout")
 252                         case <-ticker.C:
 253                                 if _, err = conn.Write(cookie[:]); err != nil {
 254                                         log.Fatalln("write:", err)
 255                                 }
 256                         case buf = <-rx:
 257                                 cols = strings.Fields(string(buf))
 258                                 if cols[0] != "SID" || len(cols) != 2 {
 259                                         log.Fatalln("cookie acceptance failed:", string(buf))
 260                                 }
 261                                 sid = parseSID(cols[1])
 262                                 Streams[sid] = &Stream{name: *Name, stats: OurStats}
 263                                 break WaitForCookieAcceptance
 264                         }
 265                 }
 266                 if !timeout.Stop() {
 267                         <-timeout.C
 268                 }
 269         }
 270
 271         var keyCiphOur []byte
 272         var keyMACOur []byte
 273         {
 274                 xof, err := blake2s.NewXOF(32+16, nil)
 275                 if err != nil {
 276                         log.Fatalln(err)
 277                 }
 278                 xof.Write([]byte(vors.NoisePrologue))
 279                 xof.Write(hs.ChannelBinding())
 280                 buf := make([]byte, 32+16)
 281                 if _, err = io.ReadFull(xof, buf); err != nil {
 282                         log.Fatalln(err)
 283                 }
 284                 keyCiphOur, keyMACOur = buf[:32], buf[32:]
 285         }
 286
 287         seen := time.Now()
 288
 289         LoggerReady := make(chan struct{})
 290         GUI, err = gocui.NewGui(gocui.OutputNormal)
 291         if err != nil {
 292                 log.Fatal(err)
 293         }
 294         defer GUI.Close()
 295         GUI.SelFgColor = gocui.ColorCyan
 296         GUI.Highlight = true
 297         GUI.SetManagerFunc(guiLayout)
 298         if err := GUI.SetKeybinding("", gocui.KeyF10, gocui.ModNone, guiQuit); err != nil {
 299                 log.Fatal(err)
 300         }
 301         if err := GUI.SetKeybinding("", gocui.KeyEnter, gocui.ModNone, mute); err != nil {
 302                 log.Fatal(err)
 303         }
 304
 305         go func() {
 306                 <-GUIReadyC
 307                 v, err := GUI.View("logs")
 308                 if err != nil {
 309                         log.Fatal(err)
 310                 }
 311                 log.SetOutput(v)
 312                 log.Println("connected", "sid:", sid,
 313                         "addr:", conn.LocalAddr().String())
 314                 close(LoggerReady)
 315                 for {
 316                         time.Sleep(vors.ScreenRefresh)
 317                         GUI.Update(func(gui *gocui.Gui) error {
 318                                 return nil
 319                         })
 320                 }
 321         }()
 322
 323         go func() {
 324                 <-Finish
 325                 go GUI.Close()
 326                 time.Sleep(100 * time.Millisecond)
 327                 os.Exit(0)
 328         }()
 329
 330         go func() {
 331                 for {
 332                         time.Sleep(vors.PingTime)
 333                         buf, err := txCS.Encrypt(nil, nil, []byte(vors.CmdPing))
 334                         if err != nil {
 335                                 log.Fatalln("tx encrypt:", err)
 336                         }
 337                         if err = vors.PktWrite(ctrl, buf); err != nil {
 338                                 log.Fatalln("tx:", err)
 339                         }
 340                 }
 341         }()
 342
 343         go func(seen *time.Time) {
 344                 var now time.Time
 345                 for buf := range rx {
 346                         if string(buf) == vors.CmdPong {
 347                                 now = time.Now()
 348                                 *seen = now
 349                                 continue
 350                         }
 351                         cols := strings.Fields(string(buf))
 352                         switch cols[0] {
 353                         case vors.CmdAdd:
 354                                 sidRaw, name, keyHex := cols[1], cols[2], cols[3]
 355                                 log.Println("add", name, "sid:", sidRaw)
 356                                 sid := parseSID(sidRaw)
 357                                 key, err := hex.DecodeString(keyHex)
 358                                 if err != nil {
 359                                         log.Fatal(err)
 360                                 }
 361                                 keyCiph, keyMAC := key[:32], key[32:]
 362                                 stream := &Stream{
 363                                         name:  name,
 364                                         in:    make(chan []byte, 1<<10),
 365                                         stats: &Stats{dead: make(chan struct{})},
 366                                 }
 367                                 go func() {
 368                                         dec, err := opus.NewDecoder(vors.Rate, 1)
 369                                         if err != nil {
 370                                                 log.Fatal(err)
 371                                         }
 372                                         if err = dec.SetComplexity(10); err != nil {
 373                                                 log.Fatal(err)
 374                                         }
 375
 376                                         var player io.WriteCloser
 377                                         playerTx := make(chan []byte, 5)
 378                                         var cmd *exec.Cmd
 379                                         if *playCmd != "" {
 380                                                 cmd = makeCmd(*playCmd)
 381                                                 player, err = cmd.StdinPipe()
 382                                                 if err != nil {
 383                                                         log.Fatal(err)
 384                                                 }
 385                                                 err = cmd.Start()
 386                                                 if err != nil {
 387                                                         log.Fatal(err)
 388                                                 }
 389                                                 go func() {
 390                                                         var pcmbuf []byte
 391                                                         var ok bool
 392                                                         var err error
 393                                                         for {
 394                                                                 for len(playerTx) > vors.MaxLost {
 395                                                                         <-playerTx
 396                                                                         stream.stats.reorder++
 397                                                                 }
 398                                                                 pcmbuf, ok = <-playerTx
 399                                                                 if !ok {
 400                                                                         break
 401                                                                 }
 402                                                                 if _, err = io.Copy(player,
 403                                                                         bytes.NewReader(pcmbuf)); err != nil {
 404                                                                         log.Println("play:", err)
 405                                                                 }
 406                                                         }
 407                                                         cmd.Process.Kill()
 408                                                 }()
 409                                         }
 410
 411                                         var ciph *chacha20.Cipher
 412                                         mac := siphash.New(keyMAC)
 413                                         tag := make([]byte, siphash.Size)
 414                                         var ctr uint32
 415                                         pcm := make([]int16, vors.FrameLen)
 416                                         nonce := make([]byte, 12)
 417                                         var pkt []byte
 418                                         lost := -1
 419                                         var lastDur int
 420                                         for buf := range stream.in {
 421                                                 copy(nonce[len(nonce)-4:], buf)
 422                                                 mac.Reset()
 423                                                 if _, err = mac.Write(buf[:len(buf)-siphash.Size]); err != nil {
 424                                                         log.Fatal(err)
 425                                                 }
 426                                                 mac.Sum(tag[:0])
 427                                                 if subtle.ConstantTimeCompare(
 428                                                         tag[:siphash.Size],
 429                                                         buf[len(buf)-siphash.Size:],
 430                                                 ) != 1 {
 431                                                         stream.stats.bads++
 432                                                         continue
 433                                                 }
 434                                                 ciph, err = chacha20.NewUnauthenticatedCipher(keyCiph, nonce)
 435                                                 if err != nil {
 436                                                         log.Fatal(err)
 437                                                 }
 438                                                 pkt = buf[4 : len(buf)-siphash.Size]
 439                                                 ciph.XORKeyStream(pkt, pkt)
 440
 441                                                 ctr = binary.BigEndian.Uint32(nonce[len(nonce)-4:])
 442                                                 if lost == -1 {
 443                                                         // ignore the very first packet in the stream
 444                                                         lost = 0
 445                                                 } else {
 446                                                         lost = int(ctr - (stream.ctr + 1))
 447                                                 }
 448                                                 stream.ctr = ctr
 449                                                 stream.stats.lost += int64(lost)
 450                                                 if lost > vors.MaxLost {
 451                                                         lost = 0
 452                                                 }
 453                                                 for ; lost > 0; lost-- {
 454                                                         lastDur, err = dec.LastPacketDuration()
 455                                                         if err != nil {
 456                                                                 log.Println("PLC:", err)
 457                                                                 continue
 458                                                         }
 459                                                         err = dec.DecodePLC(pcm[:lastDur])
 460                                                         if err != nil {
 461                                                                 log.Println("PLC:", err)
 462                                                                 continue
 463                                                         }
 464                                                         stream.stats.AddRMS(pcm)
 465                                                         if cmd == nil {
 466                                                                 continue
 467                                                         }
 468                                                         pcmbuf := make([]byte, 2*lastDur)
 469                                                         pcmConv(pcmbuf, pcm[:lastDur])
 470                                                         playerTx <- pcmbuf
 471                                                 }
 472                                                 _, err = dec.Decode(pkt, pcm)
 473                                                 if err != nil {
 474                                                         log.Println("decode:", err)
 475                                                         continue
 476                                                 }
 477                                                 stream.stats.AddRMS(pcm)
 478                                                 stream.stats.last = time.Now()
 479                                                 if cmd == nil {
 480                                                         continue
 481                                                 }
 482                                                 pcmbuf := make([]byte, 2*len(pcm))
 483                                                 pcmConv(pcmbuf, pcm)
 484                                                 playerTx <- pcmbuf
 485                                         }
 486                                         if cmd != nil {
 487                                                 close(playerTx)
 488                                         }
 489                                 }()
 490                                 go statsDrawer(stream.stats, stream.name)
 491                                 Streams[sid] = stream
 492                         case vors.CmdDel:
 493                                 sid := parseSID(cols[1])
 494                                 s := Streams[sid]
 495                                 if s == nil {
 496                                         log.Println("unknown sid:", sid)
 497                                         continue
 498                                 }
 499                                 log.Println("del", s.name, "sid:", cols[1])
 500                                 delete(Streams, sid)
 501                                 close(s.in)
 502                                 close(s.stats.dead)
 503                         default:
 504                                 log.Fatal("unknown cmd:", cols[0])
 505                         }
 506                 }
 507         }(&seen)
 508
 509         go func(seen *time.Time) {
 510                 for now := range time.Tick(vors.PingTime) {
 511                         if seen.Add(2 * vors.PingTime).Before(now) {
 512                                 log.Println("timeout:", seen)
 513                                 Finish <- struct{}{}
 514                                 break
 515                         }
 516                 }
 517         }(&seen)
 518
 519         go func() {
 520                 <-LoggerReady
 521                 var n int
 522                 var from *net.UDPAddr
 523                 var err error
 524                 var stream *Stream
 525                 var ctr uint32
 526                 for {
 527                         buf := make([]byte, 2*vors.FrameLen)
 528                         n, from, err = conn.ReadFromUDP(buf)
 529                         if err != nil {
 530                                 log.Println("recvfrom:", err)
 531                                 Finish <- struct{}{}
 532                                 break
 533                         }
 534                         if from.Port != srvAddrUDP.Port || !from.IP.Equal(srvAddrUDP.IP) {
 535                                 log.Println("wrong addr:", from)
 536                                 continue
 537                         }
 538                         if n <= 4+siphash.Size {
 539                                 log.Println("too small:", n)
 540                                 continue
 541                         }
 542                         stream = Streams[buf[0]]
 543                         if stream == nil {
 544                                 // log.Println("unknown stream:", buf[0])
 545                                 continue
 546                         }
 547                         stream.stats.pkts++
 548                         stream.stats.bytes += vors.IPHdrLen(from.IP) + 8 + uint64(n)
 549                         ctr = binary.BigEndian.Uint32(buf)
 550                         if ctr <= stream.ctr {
 551                                 stream.stats.reorder++
 552                                 continue
 553                         }
 554                         stream.in <- buf[:n]
 555                 }
 556         }()
 557
 558         go statsDrawer(OurStats, *Name)
 559         go func() {
 560                 <-LoggerReady
 561                 for now := range time.NewTicker(time.Second).C {
 562                         if !OurStats.last.Add(time.Second).Before(now) {
 563                                 continue
 564                         }
 565                         OurStats.pkts++
 566                         OurStats.bytes += vors.IPHdrLen(srvAddrUDP.IP) + 8 + 1
 567                         if _, err = conn.Write([]byte{sid}); err != nil {
 568                                 log.Println("send:", err)
 569                                 Finish <- struct{}{}
 570                         }
 571                 }
 572         }()
 573         go func() {
 574                 if *recCmd == "" {
 575                         return
 576                 }
 577                 <-LoggerReady
 578                 var ciph *chacha20.Cipher
 579                 mac := siphash.New(keyMACOur)
 580                 tag := make([]byte, siphash.Size)
 581                 buf := make([]byte, 2*vors.FrameLen)
 582                 pcm := make([]int16, vors.FrameLen)
 583                 nonce := make([]byte, 12)
 584                 nonce[len(nonce)-4] = sid
 585                 var pkt []byte
 586                 var n, i int
 587                 for {
 588                         _, err = io.ReadFull(mic, buf)
 589                         if err != nil {
 590                                 log.Println("mic:", err)
 591                                 break
 592                         }
 593                         if Muted {
 594                                 continue
 595                         }
 596                         for i = 0; i < vors.FrameLen; i++ {
 597                                 pcm[i] = int16(uint16(buf[i*2+0]) | (uint16(buf[i*2+1]) << 8))
 598                         }
 599                         if vad != 0 && vors.RMS(pcm) < vad {
 600                                 continue
 601                         }
 602                         n, err = opusEnc.Encode(pcm, buf[4:])
 603                         if err != nil {
 604                                 log.Fatal(err)
 605                         }
 606                         if n <= 2 {
 607                                 // DTX
 608                                 continue
 609                         }
 610
 611                         incr(nonce[len(nonce)-3:])
 612                         copy(buf, nonce[len(nonce)-4:])
 613                         ciph, err = chacha20.NewUnauthenticatedCipher(keyCiphOur, nonce)
 614                         if err != nil {
 615                                 log.Fatal(err)
 616                         }
 617                         ciph.XORKeyStream(buf[4:4+n], buf[4:4+n])
 618                         mac.Reset()
 619                         if _, err = mac.Write(buf[:4+n]); err != nil {
 620                                 log.Fatal(err)
 621                         }
 622                         mac.Sum(tag[:0])
 623                         copy(buf[4+n:], tag)
 624                         pkt = buf[:4+n+siphash.Size]
 625
 626                         OurStats.pkts++
 627                         OurStats.bytes += vors.IPHdrLen(srvAddrUDP.IP) + 8 + uint64(len(pkt))
 628                         OurStats.last = time.Now()
 629                         OurStats.AddRMS(pcm)
 630                         if _, err = conn.Write(pkt); err != nil {
 631                                 log.Println("send:", err)
 632                                 break
 633                         }
 634                 }
 635         }()
 636
 637         err = GUI.MainLoop()
 638         if err != nil && err != gocui.ErrQuit {
 639                 log.Fatal(err)
 640         }
 641 }