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.Fatalln("rx", err)
 164                         }
 165                         buf, err = rxCS.Decrypt(buf[:0], nil, buf)
 166                         if err != nil {
 167                                 log.Fatalln("rx decrypt", err)
 168                         }
 169                         rx <- buf
 170                 }
 171         }()
 172
 173         srvAddrUDP := vors.MustResolveUDP(*srvAddr)
 174         conn, err := net.DialUDP("udp", nil, srvAddrUDP)
 175         if err != nil {
 176                 log.Fatalln("connect:", err)
 177         }
 178         var sid byte
 179         {
 180                 cols := strings.Fields(string(buf))
 181                 if cols[0] != "OK" || len(cols) != 2 {
 182                         log.Fatalln("handshake failed:", cols)
 183                 }
 184                 var cookie vors.Cookie
 185                 cookieRaw, err := hex.DecodeString(cols[1])
 186                 if err != nil {
 187                         log.Fatal(err)
 188                 }
 189                 copy(cookie[:], cookieRaw)
 190                 timeout := time.NewTimer(vors.PingTime)
 191                 defer func() {
 192                         if !timeout.Stop() {
 193                                 <-timeout.C
 194                         }
 195                 }()
 196                 ticker := time.NewTicker(time.Second)
 197                 if _, err = conn.Write(cookie[:]); err != nil {
 198                         log.Fatalln("write:", err)
 199                 }
 200         WaitForCookieAcceptance:
 201                 for {
 202                         select {
 203                         case <-timeout.C:
 204                                 log.Fatalln("cookie acceptance timeout")
 205                         case <-ticker.C:
 206                                 if _, err = conn.Write(cookie[:]); err != nil {
 207                                         log.Fatalln("write:", err)
 208                                 }
 209                         case buf = <-rx:
 210                                 cols = strings.Fields(string(buf))
 211                                 if cols[0] != "SID" || len(cols) != 2 {
 212                                         log.Fatalln("cookie acceptance failed:", string(buf))
 213                                 }
 214                                 sid = parseSID(cols[1])
 215                                 Streams[sid] = &Stream{name: *Name, stats: OurStats}
 216                                 break WaitForCookieAcceptance
 217                         }
 218                 }
 219                 if !timeout.Stop() {
 220                         <-timeout.C
 221                 }
 222         }
 223
 224         var keyOur []byte
 225         {
 226                 h, err := blake2s.New256(hs.ChannelBinding())
 227                 if err != nil {
 228                         log.Fatalln(err)
 229                 }
 230                 h.Write([]byte(vors.NoisePrologue))
 231                 keyOur = h.Sum(nil)
 232         }
 233
 234         seen := time.Now()
 235
 236         LoggerReady := make(chan struct{})
 237         GUI, err = gocui.NewGui(gocui.OutputNormal)
 238         if err != nil {
 239                 log.Fatal(err)
 240         }
 241         defer GUI.Close()
 242         GUI.SelFgColor = gocui.ColorCyan
 243         GUI.Highlight = true
 244         GUI.SetManagerFunc(guiLayout)
 245         if err := GUI.SetKeybinding("", gocui.KeyF10, gocui.ModNone, guiQuit); err != nil {
 246                 log.Fatal(err)
 247         }
 248         if err := GUI.SetKeybinding("", gocui.KeyEnter, gocui.ModNone, mute); err != nil {
 249                 log.Fatal(err)
 250         }
 251
 252         go func() {
 253                 <-GUIReadyC
 254                 v, err := GUI.View("logs")
 255                 if err != nil {
 256                         log.Fatal(err)
 257                 }
 258                 log.SetOutput(v)
 259                 log.Println("connected", "sid:", sid,
 260                         "addr:", conn.LocalAddr().String())
 261                 close(LoggerReady)
 262                 for {
 263                         time.Sleep(vors.ScreenRefresh)
 264                         GUI.Update(func(gui *gocui.Gui) error {
 265                                 return nil
 266                         })
 267                 }
 268         }()
 269
 270         go func() {
 271                 <-Finish
 272                 go GUI.Close()
 273                 time.Sleep(100 * time.Millisecond)
 274                 os.Exit(0)
 275         }()
 276
 277         go func() {
 278                 for {
 279                         time.Sleep(vors.PingTime)
 280                         buf, err := txCS.Encrypt(nil, nil, []byte(vors.CmdPing))
 281                         if err != nil {
 282                                 log.Fatalln("tx encrypt:", err)
 283                         }
 284                         if err = vors.PktWrite(ctrl, buf); err != nil {
 285                                 log.Fatalln("tx:", err)
 286                         }
 287                 }
 288         }()
 289
 290         go func(seen *time.Time) {
 291                 var now time.Time
 292                 for buf := range rx {
 293                         if string(buf) == vors.CmdPong {
 294                                 now = time.Now()
 295                                 *seen = now
 296                                 continue
 297                         }
 298                         cols := strings.Fields(string(buf))
 299                         switch cols[0] {
 300                         case vors.CmdAdd:
 301                                 sidRaw, name, keyHex := cols[1], cols[2], cols[3]
 302                                 log.Println("add", name, "sid:", sidRaw)
 303                                 sid := parseSID(sidRaw)
 304                                 key, err := hex.DecodeString(keyHex)
 305                                 if err != nil {
 306                                         log.Fatal(err)
 307                                 }
 308                                 stream := &Stream{
 309                                         name:  name,
 310                                         in:    make(chan []byte, 1<<10),
 311                                         stats: &Stats{dead: make(chan struct{})},
 312                                 }
 313                                 go func() {
 314                                         dec, err := opus.NewDecoder(vors.Rate, 1)
 315                                         if err != nil {
 316                                                 log.Fatal(err)
 317                                         }
 318
 319                                         var player io.WriteCloser
 320                                         var cmd *exec.Cmd
 321                                         if *playCmd != "" {
 322                                                 cmd = makeCmd(*playCmd)
 323                                                 player, err = cmd.StdinPipe()
 324                                                 if err != nil {
 325                                                         log.Fatal(err)
 326                                                 }
 327                                                 err = cmd.Start()
 328                                                 if err != nil {
 329                                                         log.Fatal(err)
 330                                                 }
 331                                         }
 332
 333                                         var ciph *chacha20.Cipher
 334                                         var macKey [32]byte
 335                                         var mac *poly1305.MAC
 336                                         tag := make([]byte, poly1305.TagSize)
 337                                         var ctr uint32
 338                                         pcm := make([]int16, vors.FrameLen)
 339                                         pcmbuf := make([]byte, 2*vors.FrameLen)
 340                                         nonce := make([]byte, 12)
 341                                         var pkt []byte
 342                                         lost := -1
 343                                         var lastDur int
 344                                         for buf := range stream.in {
 345                                                 copy(nonce[len(nonce)-4:], buf)
 346                                                 ciph, err = chacha20.NewUnauthenticatedCipher(key, nonce)
 347                                                 if err != nil {
 348                                                         log.Fatal(err)
 349                                                 }
 350                                                 clear(macKey[:])
 351                                                 ciph.XORKeyStream(macKey[:], macKey[:])
 352                                                 ciph.SetCounter(1)
 353                                                 mac = poly1305.New(&macKey)
 354                                                 if _, err = mac.Write(buf[4 : len(buf)-vors.TagLen]); err != nil {
 355                                                         log.Fatal(err)
 356                                                 }
 357                                                 mac.Sum(tag[:0])
 358                                                 if subtle.ConstantTimeCompare(
 359                                                         tag[:vors.TagLen],
 360                                                         buf[len(buf)-vors.TagLen:],
 361                                                 ) != 1 {
 362                                                         log.Println("decrypt:", stream.name, "tag differs")
 363                                                         continue
 364                                                 }
 365                                                 pkt = buf[4 : len(buf)-vors.TagLen]
 366                                                 ciph.XORKeyStream(pkt, pkt)
 367
 368                                                 ctr = binary.BigEndian.Uint32(nonce[len(nonce)-4:])
 369                                                 if lost == -1 {
 370                                                         // ignore the very first packet in the stream
 371                                                         lost = 0
 372                                                 } else {
 373                                                         lost = int(ctr - (stream.ctr + 1))
 374                                                 }
 375                                                 stream.ctr = ctr
 376                                                 stream.stats.lost += int64(lost)
 377                                                 if lost > vors.MaxLost {
 378                                                         lost = 0
 379                                                 }
 380                                                 for ; lost > 0; lost-- {
 381                                                         lastDur, err = dec.LastPacketDuration()
 382                                                         if err != nil {
 383                                                                 log.Println("PLC:", err)
 384                                                                 continue
 385                                                         }
 386                                                         err = dec.DecodePLC(pcm[:lastDur])
 387                                                         if err != nil {
 388                                                                 log.Println("PLC:", err)
 389                                                                 continue
 390                                                         }
 391                                                         stream.stats.AddRMS(pcm)
 392                                                         if cmd == nil {
 393                                                                 continue
 394                                                         }
 395                                                         pcmConv(pcmbuf, pcm[:lastDur])
 396                                                         if _, err = io.Copy(player, bytes.NewReader(
 397                                                                 pcmbuf[:2*lastDur])); err != nil {
 398                                                                 log.Println("play:", err)
 399                                                         }
 400                                                 }
 401                                                 _, err = dec.Decode(pkt, pcm)
 402                                                 if err != nil {
 403                                                         log.Println("decode:", err)
 404                                                         continue
 405                                                 }
 406                                                 stream.stats.AddRMS(pcm)
 407                                                 stream.stats.last = time.Now()
 408                                                 if cmd == nil {
 409                                                         continue
 410                                                 }
 411                                                 pcmConv(pcmbuf, pcm)
 412                                                 if _, err = io.Copy(player,
 413                                                         bytes.NewReader(pcmbuf)); err != nil {
 414                                                         log.Println("play:", err)
 415                                                 }
 416                                         }
 417                                         if cmd != nil {
 418                                                 cmd.Process.Kill()
 419                                         }
 420                                 }()
 421                                 go statsDrawer(stream.stats, stream.name)
 422                                 Streams[sid] = stream
 423                         case vors.CmdDel:
 424                                 sid := parseSID(cols[1])
 425                                 s := Streams[sid]
 426                                 if s == nil {
 427                                         log.Println("unknown sid:", sid)
 428                                         continue
 429                                 }
 430                                 log.Println("del", s.name, "sid:", cols[1])
 431                                 delete(Streams, sid)
 432                                 close(s.in)
 433                                 close(s.stats.dead)
 434                         default:
 435                                 log.Fatal("unknown cmd:", cols[0])
 436                         }
 437                 }
 438         }(&seen)
 439
 440         go func(seen *time.Time) {
 441                 for now := range time.Tick(vors.PingTime) {
 442                         if seen.Add(2 * vors.PingTime).Before(now) {
 443                                 log.Println("timeout:", seen)
 444                                 Finish <- struct{}{}
 445                                 break
 446                         }
 447                 }
 448         }(&seen)
 449
 450         go func() {
 451                 <-LoggerReady
 452                 var n int
 453                 var from *net.UDPAddr
 454                 var err error
 455                 var stream *Stream
 456                 var ctr uint32
 457                 for {
 458                         buf := make([]byte, 2*vors.FrameLen)
 459                         n, from, err = conn.ReadFromUDP(buf)
 460                         if err != nil {
 461                                 log.Println("recvfrom:", err)
 462                                 Finish <- struct{}{}
 463                                 break
 464                         }
 465                         if from.Port != srvAddrUDP.Port || !from.IP.Equal(srvAddrUDP.IP) {
 466                                 log.Println("wrong addr:", from)
 467                                 continue
 468                         }
 469                         if n <= 4+vors.TagLen {
 470                                 log.Println("too small:", n)
 471                                 continue
 472                         }
 473                         stream = Streams[buf[0]]
 474                         if stream == nil {
 475                                 // log.Println("unknown stream:", buf[0])
 476                                 continue
 477                         }
 478                         stream.stats.pkts++
 479                         stream.stats.bytes += uint64(n)
 480                         ctr = binary.BigEndian.Uint32(buf)
 481                         if ctr <= stream.ctr {
 482                                 stream.stats.reorder++
 483                                 continue
 484                         }
 485                         stream.in <- buf[:n]
 486                 }
 487         }()
 488
 489         go statsDrawer(OurStats, *Name)
 490         go func() {
 491                 <-LoggerReady
 492                 for {
 493                         OurStats.pkts++
 494                         OurStats.bytes += 1
 495                         if _, err = conn.Write([]byte{sid}); err != nil {
 496                                 log.Println("send:", err)
 497                                 Finish <- struct{}{}
 498                         }
 499                         time.Sleep(time.Second)
 500                 }
 501         }()
 502         go func() {
 503                 if *recCmd == "" {
 504                         return
 505                 }
 506                 <-LoggerReady
 507                 var ciph *chacha20.Cipher
 508                 var macKey [32]byte
 509                 var mac *poly1305.MAC
 510                 tag := make([]byte, poly1305.TagSize)
 511                 buf := make([]byte, 2*vors.FrameLen)
 512                 pcm := make([]int16, vors.FrameLen)
 513                 nonce := make([]byte, 12)
 514                 nonce[len(nonce)-4] = sid
 515                 var pkt []byte
 516                 var n, i int
 517                 for {
 518                         _, err = io.ReadFull(mic, buf)
 519                         if err != nil {
 520                                 log.Println("mic:", err)
 521                                 break
 522                         }
 523                         if Muted {
 524                                 continue
 525                         }
 526                         for i = 0; i < vors.FrameLen; i++ {
 527                                 pcm[i] = int16(uint16(buf[i*2+0]) | (uint16(buf[i*2+1]) << 8))
 528                         }
 529                         if vad != 0 && vors.RMS(pcm) < vad {
 530                                 continue
 531                         }
 532                         n, err = opusEnc.Encode(pcm, buf[4:])
 533                         if err != nil {
 534                                 log.Fatal(err)
 535                         }
 536                         if n <= 2 {
 537                                 // DTX
 538                                 continue
 539                         }
 540
 541                         incr(nonce[len(nonce)-3:])
 542                         copy(buf, nonce[len(nonce)-4:])
 543                         ciph, err = chacha20.NewUnauthenticatedCipher(keyOur, nonce)
 544                         if err != nil {
 545                                 log.Fatal(err)
 546                         }
 547                         clear(macKey[:])
 548                         ciph.XORKeyStream(macKey[:], macKey[:])
 549                         ciph.SetCounter(1)
 550                         ciph.XORKeyStream(buf[4:4+n], buf[4:4+n])
 551                         mac = poly1305.New(&macKey)
 552                         if _, err = mac.Write(buf[4 : 4+n]); err != nil {
 553                                 log.Fatal(err)
 554                         }
 555                         mac.Sum(tag[:0])
 556                         copy(buf[4+n:], tag[:vors.TagLen])
 557                         pkt = buf[:4+n+vors.TagLen]
 558
 559                         OurStats.pkts++
 560                         OurStats.bytes += uint64(len(pkt))
 561                         OurStats.last = time.Now()
 562                         OurStats.AddRMS(pcm)
 563                         if _, err = conn.Write(pkt); err != nil {
 564                                 log.Println("send:", err)
 565                                 break
 566                         }
 567                 }
 568         }()
 569
 570         err = GUI.MainLoop()
 571         if err != nil && err != gocui.ErrQuit {
 572                 log.Fatal(err)
 573         }
 574 }