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/v3/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 incr(data []byte) {
  72         for i := len(data) - 1; i >= 0; i-- {
  73                 data[i]++
  74                 if data[i] != 0 {
  75                         return
  76                 }
  77         }
  78         panic("overflow")
  79 }
  80
  81 func main() {
  82         srvAddr := flag.String("srv", "vors.home.arpa:"+strconv.Itoa(vors.DefaultPort),
  83                 "host:TCP/UDP port to connect to")
  84         srvPubB64 := flag.String("pub", "", "server's public key, Base64")
  85         recCmd := flag.String("rec", "rec "+vors.SoxParams, "rec command")
  86         playCmd := flag.String("play", "play "+vors.SoxParams, "play command")
  87         vadRaw := flag.Uint("vad", 0, "VAD threshold")
  88         passwd := flag.String("passwd", "", "protected room's password")
  89         muteToggle := flag.String("mute-toggle", "", "path to FIFO to toggle mute")
  90         prefer4 := flag.Bool("4", false,
  91                 "Prefer obsolete legacy IPv4 address during name resolution")
  92         version := flag.Bool("version", false, "print version")
  93         warranty := flag.Bool("warranty", false, "print warranty information")
  94         flag.Parse()
  95         log.SetFlags(log.Lmicroseconds | log.Lshortfile)
  96
  97         if *warranty {
  98                 fmt.Println(vors.Warranty)
  99                 return
 100         }
 101         if *version {
 102                 fmt.Println(vors.GetVersion())
 103                 return
 104         }
 105
 106         srvPub, err := base64.RawURLEncoding.DecodeString(*srvPubB64)
 107         if err != nil {
 108                 log.Fatal(err)
 109         }
 110         *Name = strings.ReplaceAll(*Name, " ", "-")
 111
 112         go func() {
 113                 if *muteToggle == "" {
 114                         return
 115                 }
 116                 for {
 117                         fd, err := os.OpenFile(*muteToggle, os.O_WRONLY, os.FileMode(0666))
 118                         if err != nil {
 119                                 log.Fatalln(err)
 120                         }
 121                         Muted = !Muted
 122                         var reply string
 123                         if Muted {
 124                                 reply = "muted"
 125                         } else {
 126                                 reply = "unmuted"
 127                         }
 128                         fd.WriteString(reply + "\n")
 129                         fd.Close()
 130                         time.Sleep(time.Second)
 131                 }
 132         }()
 133
 134         vad := uint64(*vadRaw)
 135         opusEnc := newOpusEnc()
 136         var mic io.ReadCloser
 137         if *recCmd != "" {
 138                 cmd := vors.MakeCmd(*recCmd)
 139                 mic, err = cmd.StdoutPipe()
 140                 if err != nil {
 141                         log.Fatal(err)
 142                 }
 143                 err = cmd.Start()
 144                 if err != nil {
 145                         log.Fatal(err)
 146                 }
 147         }
 148
 149         vors.PreferIPv4 = *prefer4
 150         ctrl, err := net.DialTCP("tcp", nil, vors.MustResolveTCP(*srvAddr))
 151         if err != nil {
 152                 log.Fatalln("dial server:", err)
 153         }
 154         defer ctrl.Close()
 155         if err = ctrl.SetNoDelay(true); err != nil {
 156                 log.Fatalln("nodelay:", err)
 157         }
 158
 159         hs, err := noise.NewHandshakeState(noise.Config{
 160                 CipherSuite: vors.NoiseCipherSuite,
 161                 Pattern:     noise.HandshakeNK,
 162                 Initiator:   true,
 163                 PeerStatic:  srvPub,
 164                 Prologue:    []byte(vors.NoisePrologue),
 165         })
 166         if err != nil {
 167                 log.Fatalln("noise.NewHandshakeState:", err)
 168         }
 169         buf, _, _, err := hs.WriteMessage(nil, []byte(*Name+" "+*Room+" "+*passwd))
 170         if err != nil {
 171                 log.Fatalln("handshake encrypt:", err)
 172         }
 173         buf = append(
 174                 append(
 175                         []byte(vors.NoisePrologue),
 176                         byte((len(buf)&0xFF00)>>8),
 177                         byte((len(buf)&0x00FF)>>0),
 178                 ),
 179                 buf...,
 180         )
 181         _, err = io.Copy(ctrl, bytes.NewReader(buf))
 182         if err != nil {
 183                 log.Fatalln("write handshake:", err)
 184                 return
 185         }
 186         buf, err = vors.PktRead(ctrl)
 187         if err != nil {
 188                 log.Fatalln("read handshake:", err)
 189         }
 190         buf, txCS, rxCS, err := hs.ReadMessage(nil, buf)
 191         if err != nil {
 192                 log.Fatalln("handshake decrypt:", err)
 193         }
 194
 195         rx := make(chan []byte)
 196         go func() {
 197                 for {
 198                         buf, err := vors.PktRead(ctrl)
 199                         if err != nil {
 200                                 log.Println("rx", err)
 201                                 break
 202                         }
 203                         buf, err = rxCS.Decrypt(buf[:0], nil, buf)
 204                         if err != nil {
 205                                 log.Println("rx decrypt", err)
 206                                 break
 207                         }
 208                         rx <- buf
 209                 }
 210                 Finish <- struct{}{}
 211         }()
 212
 213         srvAddrUDP := vors.MustResolveUDP(*srvAddr)
 214         conn, err := net.DialUDP("udp", nil, srvAddrUDP)
 215         if err != nil {
 216                 log.Fatalln("connect:", err)
 217         }
 218         var sid byte
 219         {
 220                 cols := strings.Fields(string(buf))
 221                 if cols[0] != "OK" || len(cols) != 2 {
 222                         log.Fatalln("handshake failed:", cols)
 223                 }
 224                 var cookie vors.Cookie
 225                 cookieRaw, err := hex.DecodeString(cols[1])
 226                 if err != nil {
 227                         log.Fatal(err)
 228                 }
 229                 copy(cookie[:], cookieRaw)
 230                 timeout := time.NewTimer(vors.PingTime)
 231                 defer func() {
 232                         if !timeout.Stop() {
 233                                 <-timeout.C
 234                         }
 235                 }()
 236                 ticker := time.NewTicker(time.Second)
 237                 if _, err = conn.Write(cookie[:]); err != nil {
 238                         log.Fatalln("write:", err)
 239                 }
 240         WaitForCookieAcceptance:
 241                 for {
 242                         select {
 243                         case <-timeout.C:
 244                                 log.Fatalln("cookie acceptance timeout")
 245                         case <-ticker.C:
 246                                 if _, err = conn.Write(cookie[:]); err != nil {
 247                                         log.Fatalln("write:", err)
 248                                 }
 249                         case buf = <-rx:
 250                                 cols = strings.Fields(string(buf))
 251                                 if cols[0] != "SID" || len(cols) != 2 {
 252                                         log.Fatalln("cookie acceptance failed:", string(buf))
 253                                 }
 254                                 sid = parseSID(cols[1])
 255                                 Streams[sid] = &Stream{name: *Name, stats: OurStats}
 256                                 break WaitForCookieAcceptance
 257                         }
 258                 }
 259                 if !timeout.Stop() {
 260                         <-timeout.C
 261                 }
 262         }
 263
 264         var keyCiphOur []byte
 265         var keyMACOur []byte
 266         {
 267                 xof, err := blake2s.NewXOF(chacha20.KeySize+16, nil)
 268                 if err != nil {
 269                         log.Fatalln(err)
 270                 }
 271                 xof.Write([]byte(vors.NoisePrologue))
 272                 xof.Write(hs.ChannelBinding())
 273                 buf := make([]byte, chacha20.KeySize+16)
 274                 if _, err = io.ReadFull(xof, buf); err != nil {
 275                         log.Fatalln(err)
 276                 }
 277                 keyCiphOur, keyMACOur = buf[:chacha20.KeySize], buf[chacha20.KeySize:]
 278         }
 279
 280         seen := time.Now()
 281
 282         LoggerReady := make(chan struct{})
 283         GUI, err = gocui.NewGui(gocui.OutputNormal)
 284         if err != nil {
 285                 log.Fatal(err)
 286         }
 287         defer GUI.Close()
 288         GUI.SelFgColor = gocui.ColorCyan
 289         GUI.Highlight = true
 290         GUI.SetManagerFunc(guiLayout)
 291         if err := GUI.SetKeybinding("", 'q', gocui.ModNone, guiQuit); err != nil {
 292                 log.Fatal(err)
 293         }
 294         if err := GUI.SetKeybinding("", gocui.KeyEnter, gocui.ModNone, mute); err != nil {
 295                 log.Fatal(err)
 296         }
 297
 298         go func() {
 299                 <-GUIReadyC
 300                 v, err := GUI.View("logs")
 301                 if err != nil {
 302                         log.Fatal(err)
 303                 }
 304                 log.SetOutput(v)
 305                 log.Println("connected", "sid:", sid,
 306                         "addr:", conn.LocalAddr().String())
 307                 close(LoggerReady)
 308                 for {
 309                         time.Sleep(vors.ScreenRefresh)
 310                         GUI.Update(func(gui *gocui.Gui) error {
 311                                 return nil
 312                         })
 313                 }
 314         }()
 315
 316         go func() {
 317                 <-Finish
 318                 go GUI.Close()
 319                 time.Sleep(100 * time.Millisecond)
 320                 os.Exit(0)
 321         }()
 322
 323         go func() {
 324                 for {
 325                         time.Sleep(vors.PingTime)
 326                         buf, err := txCS.Encrypt(nil, nil, []byte(vors.CmdPing))
 327                         if err != nil {
 328                                 log.Fatalln("tx encrypt:", err)
 329                         }
 330                         if err = vors.PktWrite(ctrl, buf); err != nil {
 331                                 log.Fatalln("tx:", err)
 332                         }
 333                 }
 334         }()
 335
 336         go func(seen *time.Time) {
 337                 var now time.Time
 338                 for buf := range rx {
 339                         if string(buf) == vors.CmdPong {
 340                                 now = time.Now()
 341                                 *seen = now
 342                                 continue
 343                         }
 344                         cols := strings.Fields(string(buf))
 345                         switch cols[0] {
 346                         case vors.CmdAdd:
 347                                 sidRaw, name, keyHex := cols[1], cols[2], cols[3]
 348                                 log.Println("add", name, "sid:", sidRaw)
 349                                 sid := parseSID(sidRaw)
 350                                 key, err := hex.DecodeString(keyHex)
 351                                 if err != nil {
 352                                         log.Fatal(err)
 353                                 }
 354                                 keyCiph, keyMAC := key[:chacha20.KeySize], key[chacha20.KeySize:]
 355                                 stream := &Stream{
 356                                         name:  name,
 357                                         in:    make(chan []byte, 1<<10),
 358                                         stats: &Stats{dead: make(chan struct{})},
 359                                 }
 360                                 go func() {
 361                                         dec, err := opus.NewDecoder(vors.Rate, 1)
 362                                         if err != nil {
 363                                                 log.Fatal(err)
 364                                         }
 365                                         if err = dec.SetComplexity(10); err != nil {
 366                                                 log.Fatal(err)
 367                                         }
 368
 369                                         var player io.WriteCloser
 370                                         playerTx := make(chan []byte, 5)
 371                                         var cmd *exec.Cmd
 372                                         if *playCmd != "" {
 373                                                 cmd = vors.MakeCmd(*playCmd)
 374                                                 player, err = cmd.StdinPipe()
 375                                                 if err != nil {
 376                                                         log.Fatal(err)
 377                                                 }
 378                                                 err = cmd.Start()
 379                                                 if err != nil {
 380                                                         log.Fatal(err)
 381                                                 }
 382                                                 go func() {
 383                                                         var pcmbuf []byte
 384                                                         var ok bool
 385                                                         var err error
 386                                                         for {
 387                                                                 for len(playerTx) > vors.MaxLost {
 388                                                                         <-playerTx
 389                                                                         stream.stats.reorder++
 390                                                                 }
 391                                                                 pcmbuf, ok = <-playerTx
 392                                                                 if !ok {
 393                                                                         break
 394                                                                 }
 395                                                                 if _, err = io.Copy(player,
 396                                                                         bytes.NewReader(pcmbuf)); err != nil {
 397                                                                         log.Println("play:", err)
 398                                                                 }
 399                                                         }
 400                                                         cmd.Process.Kill()
 401                                                 }()
 402                                         }
 403
 404                                         var ciph *chacha20.Cipher
 405                                         mac := siphash.New(keyMAC)
 406                                         tag := make([]byte, siphash.Size)
 407                                         var ctr uint32
 408                                         pcm := make([]int16, vors.FrameLen)
 409                                         nonce := make([]byte, 12)
 410                                         var pkt []byte
 411                                         lost := -1
 412                                         var lastDur int
 413                                         for buf := range stream.in {
 414                                                 copy(nonce[len(nonce)-4:], buf)
 415                                                 mac.Reset()
 416                                                 if _, err = mac.Write(buf[:len(buf)-siphash.Size]); err != nil {
 417                                                         log.Fatal(err)
 418                                                 }
 419                                                 mac.Sum(tag[:0])
 420                                                 if subtle.ConstantTimeCompare(
 421                                                         tag[:siphash.Size],
 422                                                         buf[len(buf)-siphash.Size:],
 423                                                 ) != 1 {
 424                                                         stream.stats.bads++
 425                                                         continue
 426                                                 }
 427                                                 ciph, err = chacha20.NewUnauthenticatedCipher(keyCiph, nonce)
 428                                                 if err != nil {
 429                                                         log.Fatal(err)
 430                                                 }
 431                                                 pkt = buf[4 : len(buf)-siphash.Size]
 432                                                 ciph.XORKeyStream(pkt, pkt)
 433
 434                                                 ctr = binary.BigEndian.Uint32(nonce[len(nonce)-4:])
 435                                                 if lost == -1 {
 436                                                         // ignore the very first packet in the stream
 437                                                         lost = 0
 438                                                 } else {
 439                                                         lost = int(ctr - (stream.ctr + 1))
 440                                                 }
 441                                                 stream.ctr = ctr
 442                                                 stream.stats.lost += int64(lost)
 443                                                 if lost > vors.MaxLost {
 444                                                         lost = 0
 445                                                 }
 446                                                 for ; lost > 0; lost-- {
 447                                                         lastDur, err = dec.LastPacketDuration()
 448                                                         if err != nil {
 449                                                                 log.Println("PLC:", err)
 450                                                                 continue
 451                                                         }
 452                                                         err = dec.DecodePLC(pcm[:lastDur])
 453                                                         if err != nil {
 454                                                                 log.Println("PLC:", err)
 455                                                                 continue
 456                                                         }
 457                                                         stream.stats.AddRMS(pcm)
 458                                                         if cmd == nil {
 459                                                                 continue
 460                                                         }
 461                                                         pcmbuf := make([]byte, 2*lastDur)
 462                                                         pcmConv(pcmbuf, pcm[:lastDur])
 463                                                         playerTx <- pcmbuf
 464                                                 }
 465                                                 _, err = dec.Decode(pkt, pcm)
 466                                                 if err != nil {
 467                                                         log.Println("decode:", err)
 468                                                         continue
 469                                                 }
 470                                                 stream.stats.AddRMS(pcm)
 471                                                 stream.stats.last = time.Now()
 472                                                 if cmd == nil {
 473                                                         continue
 474                                                 }
 475                                                 pcmbuf := make([]byte, 2*len(pcm))
 476                                                 pcmConv(pcmbuf, pcm)
 477                                                 playerTx <- pcmbuf
 478                                         }
 479                                         if cmd != nil {
 480                                                 close(playerTx)
 481                                         }
 482                                 }()
 483                                 go statsDrawer(stream.stats, stream.name)
 484                                 Streams[sid] = stream
 485                         case vors.CmdDel:
 486                                 sid := parseSID(cols[1])
 487                                 s := Streams[sid]
 488                                 if s == nil {
 489                                         log.Println("unknown sid:", sid)
 490                                         continue
 491                                 }
 492                                 log.Println("del", s.name, "sid:", cols[1])
 493                                 delete(Streams, sid)
 494                                 close(s.in)
 495                                 close(s.stats.dead)
 496                         default:
 497                                 log.Fatal("unknown cmd:", cols[0])
 498                         }
 499                 }
 500         }(&seen)
 501
 502         go func(seen *time.Time) {
 503                 for now := range time.Tick(vors.PingTime) {
 504                         if seen.Add(2 * vors.PingTime).Before(now) {
 505                                 log.Println("timeout:", seen)
 506                                 Finish <- struct{}{}
 507                                 break
 508                         }
 509                 }
 510         }(&seen)
 511
 512         go func() {
 513                 <-LoggerReady
 514                 var n int
 515                 var from *net.UDPAddr
 516                 var err error
 517                 var stream *Stream
 518                 var ctr uint32
 519                 for {
 520                         buf := make([]byte, 2*vors.FrameLen)
 521                         n, from, err = conn.ReadFromUDP(buf)
 522                         if err != nil {
 523                                 log.Println("recvfrom:", err)
 524                                 Finish <- struct{}{}
 525                                 break
 526                         }
 527                         if from.Port != srvAddrUDP.Port || !from.IP.Equal(srvAddrUDP.IP) {
 528                                 log.Println("wrong addr:", from)
 529                                 continue
 530                         }
 531                         if n <= 4+siphash.Size {
 532                                 log.Println("too small:", n)
 533                                 continue
 534                         }
 535                         stream = Streams[buf[0]]
 536                         if stream == nil {
 537                                 // log.Println("unknown stream:", buf[0])
 538                                 continue
 539                         }
 540                         stream.stats.pkts++
 541                         stream.stats.bytes += vors.IPHdrLen(from.IP) + 8 + uint64(n)
 542                         ctr = binary.BigEndian.Uint32(buf)
 543                         if ctr <= stream.ctr {
 544                                 stream.stats.reorder++
 545                                 continue
 546                         }
 547                         stream.in <- buf[:n]
 548                 }
 549         }()
 550
 551         go statsDrawer(OurStats, *Name)
 552         go func() {
 553                 <-LoggerReady
 554                 for now := range time.NewTicker(time.Second).C {
 555                         if !OurStats.last.Add(time.Second).Before(now) {
 556                                 continue
 557                         }
 558                         OurStats.pkts++
 559                         OurStats.bytes += vors.IPHdrLen(srvAddrUDP.IP) + 8 + 1
 560                         if _, err = conn.Write([]byte{sid}); err != nil {
 561                                 log.Println("send:", err)
 562                         }
 563                 }
 564         }()
 565         go func() {
 566                 if *recCmd == "" {
 567                         return
 568                 }
 569                 <-LoggerReady
 570                 var ciph *chacha20.Cipher
 571                 mac := siphash.New(keyMACOur)
 572                 tag := make([]byte, siphash.Size)
 573                 buf := make([]byte, 2*vors.FrameLen)
 574                 pcm := make([]int16, vors.FrameLen)
 575                 nonce := make([]byte, 12)
 576                 nonce[len(nonce)-4] = sid
 577                 var pkt []byte
 578                 var n, i int
 579                 for {
 580                         _, err = io.ReadFull(mic, buf)
 581                         if err != nil {
 582                                 log.Println("mic:", err)
 583                                 break
 584                         }
 585                         if Muted {
 586                                 continue
 587                         }
 588                         for i = 0; i < vors.FrameLen; i++ {
 589                                 pcm[i] = int16(uint16(buf[i*2+0]) | (uint16(buf[i*2+1]) << 8))
 590                         }
 591                         if vad != 0 && vors.RMS(pcm) < vad {
 592                                 continue
 593                         }
 594                         n, err = opusEnc.Encode(pcm, buf[4:])
 595                         if err != nil {
 596                                 log.Fatal(err)
 597                         }
 598                         if n <= 2 {
 599                                 // DTX
 600                                 continue
 601                         }
 602
 603                         incr(nonce[len(nonce)-3:])
 604                         copy(buf, nonce[len(nonce)-4:])
 605                         ciph, err = chacha20.NewUnauthenticatedCipher(keyCiphOur, nonce)
 606                         if err != nil {
 607                                 log.Fatal(err)
 608                         }
 609                         ciph.XORKeyStream(buf[4:4+n], buf[4:4+n])
 610                         mac.Reset()
 611                         if _, err = mac.Write(buf[:4+n]); err != nil {
 612                                 log.Fatal(err)
 613                         }
 614                         mac.Sum(tag[:0])
 615                         copy(buf[4+n:], tag)
 616                         pkt = buf[:4+n+siphash.Size]
 617
 618                         OurStats.pkts++
 619                         OurStats.bytes += vors.IPHdrLen(srvAddrUDP.IP) + 8 + uint64(len(pkt))
 620                         OurStats.last = time.Now()
 621                         OurStats.AddRMS(pcm)
 622                         if _, err = conn.Write(pkt); err != nil {
 623                                 log.Println("send:", err)
 624                         }
 625                 }
 626         }()
 627
 628         err = GUI.MainLoop()
 629         if err != nil && err != gocui.ErrQuit {
 630                 log.Fatal(err)
 631         }
 632 }