src/cypherpunks.ru/nncp/sp.go

   1 /*
   2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
   3 Copyright (C) 2016-2019 Sergey Matveev <stargrave@stargrave.org>
   4
   5 This program is free software: you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation, either version 3 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 package nncp
  20
  21 import (
  22         "bytes"
  23         "crypto/subtle"
  24         "errors"
  25         "io"
  26         "net"
  27         "os"
  28         "path/filepath"
  29         "sort"
  30         "strconv"
  31         "sync"
  32         "time"
  33
  34         "github.com/davecgh/go-xdr/xdr2"
  35         "github.com/flynn/noise"
  36 )
  37
  38 const (
  39         MaxSPSize       = 1<<16 - 256
  40         PartSuffix      = ".part"
  41         DefaultDeadline = 10
  42 )
  43
  44 var (
  45         MagicNNCPLv1 [8]byte = [8]byte{'N', 'N', 'C', 'P', 'S', 0, 0, 1}
  46
  47         SPHeadOverhead    int
  48         SPInfoOverhead    int
  49         SPFreqOverhead    int
  50         SPFileOverhead    int
  51         SPHaltMarshalized []byte
  52
  53         NoiseCipherSuite noise.CipherSuite = noise.NewCipherSuite(
  54                 noise.DH25519,
  55                 noise.CipherChaChaPoly,
  56                 noise.HashBLAKE2b,
  57         )
  58
  59         spWorkersGroup sync.WaitGroup
  60 )
  61
  62 type SPType uint8
  63
  64 const (
  65         SPTypeInfo SPType = iota
  66         SPTypeFreq SPType = iota
  67         SPTypeFile SPType = iota
  68         SPTypeDone SPType = iota
  69         SPTypeHalt SPType = iota
  70 )
  71
  72 type SPHead struct {
  73         Type SPType
  74 }
  75
  76 type SPInfo struct {
  77         Nice uint8
  78         Size uint64
  79         Hash *[32]byte
  80 }
  81
  82 type SPFreq struct {
  83         Hash   *[32]byte
  84         Offset uint64
  85 }
  86
  87 type SPFile struct {
  88         Hash    *[32]byte
  89         Offset  uint64
  90         Payload []byte
  91 }
  92
  93 type SPDone struct {
  94         Hash *[32]byte
  95 }
  96
  97 type SPRaw struct {
  98         Magic   [8]byte
  99         Payload []byte
 100 }
 101
 102 type FreqWithNice struct {
 103         freq *SPFreq
 104         nice uint8
 105 }
 106
 107 type ConnDeadlined interface {
 108         io.ReadWriter
 109         SetReadDeadline(t time.Time) error
 110         SetWriteDeadline(t time.Time) error
 111 }
 112
 113 func init() {
 114         var buf bytes.Buffer
 115         spHead := SPHead{Type: SPTypeHalt}
 116         if _, err := xdr.Marshal(&buf, spHead); err != nil {
 117                 panic(err)
 118         }
 119         copy(SPHaltMarshalized, buf.Bytes())
 120         SPHeadOverhead = buf.Len()
 121         buf.Reset()
 122
 123         spInfo := SPInfo{Nice: 123, Size: 123, Hash: new([32]byte)}
 124         if _, err := xdr.Marshal(&buf, spInfo); err != nil {
 125                 panic(err)
 126         }
 127         SPInfoOverhead = buf.Len()
 128         buf.Reset()
 129
 130         spFreq := SPFreq{Hash: new([32]byte), Offset: 123}
 131         if _, err := xdr.Marshal(&buf, spFreq); err != nil {
 132                 panic(err)
 133         }
 134         SPFreqOverhead = buf.Len()
 135         buf.Reset()
 136
 137         spFile := SPFile{Hash: new([32]byte), Offset: 123}
 138         if _, err := xdr.Marshal(&buf, spFile); err != nil {
 139                 panic(err)
 140         }
 141         SPFileOverhead = buf.Len()
 142 }
 143
 144 func MarshalSP(typ SPType, sp interface{}) []byte {
 145         var buf bytes.Buffer
 146         var err error
 147         if _, err = xdr.Marshal(&buf, SPHead{typ}); err != nil {
 148                 panic(err)
 149         }
 150         if _, err = xdr.Marshal(&buf, sp); err != nil {
 151                 panic(err)
 152         }
 153         return buf.Bytes()
 154 }
 155
 156 func payloadsSplit(payloads [][]byte) [][]byte {
 157         var outbounds [][]byte
 158         outbound := make([]byte, 0, MaxSPSize)
 159         for i, payload := range payloads {
 160                 outbound = append(outbound, payload...)
 161                 if i+1 < len(payloads) && len(outbound)+len(payloads[i+1]) > MaxSPSize {
 162                         outbounds = append(outbounds, outbound)
 163                         outbound = make([]byte, 0, MaxSPSize)
 164                 }
 165         }
 166         if len(outbound) > 0 {
 167                 outbounds = append(outbounds, outbound)
 168         }
 169         return outbounds
 170 }
 171
 172 type SPState struct {
 173         ctx            *Ctx
 174         Node           *Node
 175         onlineDeadline uint
 176         maxOnlineTime  uint
 177         nice           uint8
 178         hs             *noise.HandshakeState
 179         csOur          *noise.CipherState
 180         csTheir        *noise.CipherState
 181         payloads       chan []byte
 182         infosTheir     map[[32]byte]*SPInfo
 183         infosOurSeen   map[[32]byte]uint8
 184         queueTheir     []*FreqWithNice
 185         wg             sync.WaitGroup
 186         RxBytes        int64
 187         RxLastSeen     time.Time
 188         TxBytes        int64
 189         TxLastSeen     time.Time
 190         started        time.Time
 191         Duration       time.Duration
 192         RxSpeed        int64
 193         TxSpeed        int64
 194         rxLock         *os.File
 195         txLock         *os.File
 196         xxOnly         TRxTx
 197         rxRate         int
 198         txRate         int
 199         isDead         bool
 200         listOnly       bool
 201         onlyPkts       map[[32]byte]bool
 202         sync.RWMutex
 203 }
 204
 205 func (state *SPState) NotAlive() bool {
 206         if state.isDead {
 207                 return true
 208         }
 209         now := time.Now()
 210         if state.maxOnlineTime > 0 && state.started.Add(time.Duration(state.maxOnlineTime)*time.Second).Before(now) {
 211                 return true
 212         }
 213         return uint(now.Sub(state.RxLastSeen).Seconds()) >= state.onlineDeadline &&
 214                 uint(now.Sub(state.TxLastSeen).Seconds()) >= state.onlineDeadline
 215 }
 216
 217 func (state *SPState) dirUnlock() {
 218         state.ctx.UnlockDir(state.rxLock)
 219         state.ctx.UnlockDir(state.txLock)
 220 }
 221
 222 func (state *SPState) WriteSP(dst io.Writer, payload []byte) error {
 223         n, err := xdr.Marshal(dst, SPRaw{Magic: MagicNNCPLv1, Payload: payload})
 224         if err == nil {
 225                 state.TxLastSeen = time.Now()
 226                 state.TxBytes += int64(n)
 227         }
 228         return err
 229 }
 230
 231 func (state *SPState) ReadSP(src io.Reader) ([]byte, error) {
 232         var sp SPRaw
 233         n, err := xdr.UnmarshalLimited(src, &sp, 1<<17)
 234         if err != nil {
 235                 return nil, err
 236         }
 237         state.RxLastSeen = time.Now()
 238         state.RxBytes += int64(n)
 239         if sp.Magic != MagicNNCPLv1 {
 240                 return nil, BadMagic
 241         }
 242         return sp.Payload, nil
 243 }
 244
 245 func (ctx *Ctx) infosOur(nodeId *NodeId, nice uint8, seen *map[[32]byte]uint8) [][]byte {
 246         var infos []*SPInfo
 247         var totalSize int64
 248         for job := range ctx.Jobs(nodeId, TTx) {
 249                 job.Fd.Close()
 250                 if job.PktEnc.Nice > nice {
 251                         continue
 252                 }
 253                 if _, known := (*seen)[*job.HshValue]; known {
 254                         continue
 255                 }
 256                 totalSize += job.Size
 257                 infos = append(infos, &SPInfo{
 258                         Nice: job.PktEnc.Nice,
 259                         Size: uint64(job.Size),
 260                         Hash: job.HshValue,
 261                 })
 262                 (*seen)[*job.HshValue] = job.PktEnc.Nice
 263         }
 264         sort.Sort(ByNice(infos))
 265         var payloads [][]byte
 266         for _, info := range infos {
 267                 payloads = append(payloads, MarshalSP(SPTypeInfo, info))
 268                 ctx.LogD("sp-info-our", SDS{
 269                         "node": nodeId,
 270                         "name": ToBase32(info.Hash[:]),
 271                         "size": strconv.FormatInt(int64(info.Size), 10),
 272                 }, "")
 273         }
 274         if totalSize > 0 {
 275                 ctx.LogI("sp-infos", SDS{
 276                         "xx":   string(TTx),
 277                         "node": nodeId,
 278                         "pkts": strconv.Itoa(len(payloads)),
 279                         "size": strconv.FormatInt(totalSize, 10),
 280                 }, "")
 281         }
 282         return payloadsSplit(payloads)
 283 }
 284
 285 func (ctx *Ctx) StartI(
 286         conn ConnDeadlined,
 287         nodeId *NodeId,
 288         nice uint8,
 289         xxOnly TRxTx,
 290         rxRate, txRate int,
 291         onlineDeadline, maxOnlineTime uint,
 292         listOnly bool,
 293         onlyPkts map[[32]byte]bool,
 294 ) (*SPState, error) {
 295         err := ctx.ensureRxDir(nodeId)
 296         if err != nil {
 297                 return nil, err
 298         }
 299         var rxLock *os.File
 300         if !listOnly && (xxOnly == "" || xxOnly == TRx) {
 301                 rxLock, err = ctx.LockDir(nodeId, TRx)
 302                 if err != nil {
 303                         return nil, err
 304                 }
 305         }
 306         var txLock *os.File
 307         if !listOnly && (xxOnly == "" || xxOnly == TTx) {
 308                 txLock, err = ctx.LockDir(nodeId, TTx)
 309                 if err != nil {
 310                         return nil, err
 311                 }
 312         }
 313         started := time.Now()
 314         node := ctx.Neigh[*nodeId]
 315         conf := noise.Config{
 316                 CipherSuite: NoiseCipherSuite,
 317                 Pattern:     noise.HandshakeIK,
 318                 Initiator:   true,
 319                 StaticKeypair: noise.DHKey{
 320                         Private: ctx.Self.NoisePrv[:],
 321                         Public:  ctx.Self.NoisePub[:],
 322                 },
 323                 PeerStatic: node.NoisePub[:],
 324         }
 325         hs, err := noise.NewHandshakeState(conf)
 326         if err != nil {
 327                 return nil, err
 328         }
 329         state := SPState{
 330                 ctx:            ctx,
 331                 hs:             hs,
 332                 Node:           node,
 333                 onlineDeadline: onlineDeadline,
 334                 maxOnlineTime:  maxOnlineTime,
 335                 nice:           nice,
 336                 payloads:       make(chan []byte),
 337                 infosTheir:     make(map[[32]byte]*SPInfo),
 338                 infosOurSeen:   make(map[[32]byte]uint8),
 339                 started:        started,
 340                 rxLock:         rxLock,
 341                 txLock:         txLock,
 342                 xxOnly:         xxOnly,
 343                 rxRate:         rxRate,
 344                 txRate:         txRate,
 345                 listOnly:       listOnly,
 346                 onlyPkts:       onlyPkts,
 347         }
 348
 349         var infosPayloads [][]byte
 350         if !listOnly && (xxOnly == "" || xxOnly == TTx) {
 351                 infosPayloads = ctx.infosOur(nodeId, nice, &state.infosOurSeen)
 352         }
 353         var firstPayload []byte
 354         if len(infosPayloads) > 0 {
 355                 firstPayload = infosPayloads[0]
 356         }
 357         // Pad first payload, to hide actual number of existing files
 358         for i := 0; i < (MaxSPSize-len(firstPayload))/SPHeadOverhead; i++ {
 359                 firstPayload = append(firstPayload, SPHaltMarshalized...)
 360         }
 361
 362         var buf []byte
 363         var payload []byte
 364         buf, _, _, err = state.hs.WriteMessage(nil, firstPayload)
 365         if err != nil {
 366                 state.dirUnlock()
 367                 return nil, err
 368         }
 369         sds := SDS{"node": nodeId, "nice": strconv.Itoa(int(nice))}
 370         ctx.LogD("sp-start", sds, "sending first message")
 371         conn.SetWriteDeadline(time.Now().Add(DefaultDeadline * time.Second))
 372         if err = state.WriteSP(conn, buf); err != nil {
 373                 ctx.LogE("sp-start", SdsAdd(sds, SDS{"err": err}), "")
 374                 state.dirUnlock()
 375                 return nil, err
 376         }
 377         ctx.LogD("sp-start", sds, "waiting for first message")
 378         conn.SetReadDeadline(time.Now().Add(DefaultDeadline * time.Second))
 379         if buf, err = state.ReadSP(conn); err != nil {
 380                 ctx.LogE("sp-start", SdsAdd(sds, SDS{"err": err}), "")
 381                 state.dirUnlock()
 382                 return nil, err
 383         }
 384         payload, state.csOur, state.csTheir, err = state.hs.ReadMessage(nil, buf)
 385         if err != nil {
 386                 ctx.LogE("sp-start", SdsAdd(sds, SDS{"err": err}), "")
 387                 state.dirUnlock()
 388                 return nil, err
 389         }
 390         ctx.LogD("sp-start", sds, "starting workers")
 391         err = state.StartWorkers(conn, infosPayloads, payload)
 392         if err != nil {
 393                 ctx.LogE("sp-start", SdsAdd(sds, SDS{"err": err}), "")
 394                 state.dirUnlock()
 395                 return nil, err
 396         }
 397         return &state, err
 398 }
 399
 400 func (ctx *Ctx) StartR(conn ConnDeadlined, nice uint8, xxOnly TRxTx) (*SPState, error) {
 401         started := time.Now()
 402         conf := noise.Config{
 403                 CipherSuite: NoiseCipherSuite,
 404                 Pattern:     noise.HandshakeIK,
 405                 Initiator:   false,
 406                 StaticKeypair: noise.DHKey{
 407                         Private: ctx.Self.NoisePrv[:],
 408                         Public:  ctx.Self.NoisePub[:],
 409                 },
 410         }
 411         hs, err := noise.NewHandshakeState(conf)
 412         if err != nil {
 413                 return nil, err
 414         }
 415         state := SPState{
 416                 ctx:          ctx,
 417                 hs:           hs,
 418                 nice:         nice,
 419                 payloads:     make(chan []byte),
 420                 infosOurSeen: make(map[[32]byte]uint8),
 421                 infosTheir:   make(map[[32]byte]*SPInfo),
 422                 started:      started,
 423                 xxOnly:       xxOnly,
 424         }
 425         var buf []byte
 426         var payload []byte
 427         ctx.LogD(
 428                 "sp-start",
 429                 SDS{"nice": strconv.Itoa(int(nice))},
 430                 "waiting for first message",
 431         )
 432         conn.SetReadDeadline(time.Now().Add(DefaultDeadline * time.Second))
 433         if buf, err = state.ReadSP(conn); err != nil {
 434                 ctx.LogE("sp-start", SDS{"err": err}, "")
 435                 return nil, err
 436         }
 437         if payload, _, _, err = state.hs.ReadMessage(nil, buf); err != nil {
 438                 ctx.LogE("sp-start", SDS{"err": err}, "")
 439                 return nil, err
 440         }
 441
 442         var node *Node
 443         for _, node = range ctx.Neigh {
 444                 if subtle.ConstantTimeCompare(state.hs.PeerStatic(), node.NoisePub[:]) == 1 {
 445                         break
 446                 }
 447         }
 448         if node == nil {
 449                 peerId := ToBase32(state.hs.PeerStatic())
 450                 ctx.LogE("sp-start", SDS{"peer": peerId}, "unknown")
 451                 return nil, errors.New("Unknown peer: " + peerId)
 452         }
 453         state.Node = node
 454         state.rxRate = node.RxRate
 455         state.txRate = node.TxRate
 456         state.onlineDeadline = node.OnlineDeadline
 457         state.maxOnlineTime = node.MaxOnlineTime
 458         sds := SDS{"node": node.Id, "nice": strconv.Itoa(int(nice))}
 459
 460         if ctx.ensureRxDir(node.Id); err != nil {
 461                 return nil, err
 462         }
 463         var rxLock *os.File
 464         if xxOnly == "" || xxOnly == TRx {
 465                 rxLock, err = ctx.LockDir(node.Id, TRx)
 466                 if err != nil {
 467                         return nil, err
 468                 }
 469         }
 470         state.rxLock = rxLock
 471         var txLock *os.File
 472         if xxOnly == "" || xxOnly == TTx {
 473                 txLock, err = ctx.LockDir(node.Id, TTx)
 474                 if err != nil {
 475                         return nil, err
 476                 }
 477         }
 478         state.txLock = txLock
 479
 480         var infosPayloads [][]byte
 481         if xxOnly == "" || xxOnly == TTx {
 482                 infosPayloads = ctx.infosOur(node.Id, nice, &state.infosOurSeen)
 483         }
 484         var firstPayload []byte
 485         if len(infosPayloads) > 0 {
 486                 firstPayload = infosPayloads[0]
 487         }
 488         // Pad first payload, to hide actual number of existing files
 489         for i := 0; i < (MaxSPSize-len(firstPayload))/SPHeadOverhead; i++ {
 490                 firstPayload = append(firstPayload, SPHaltMarshalized...)
 491         }
 492
 493         ctx.LogD("sp-start", sds, "sending first message")
 494         buf, state.csTheir, state.csOur, err = state.hs.WriteMessage(nil, firstPayload)
 495         if err != nil {
 496                 state.dirUnlock()
 497                 return nil, err
 498         }
 499         conn.SetWriteDeadline(time.Now().Add(DefaultDeadline * time.Second))
 500         if err = state.WriteSP(conn, buf); err != nil {
 501                 ctx.LogE("sp-start", SdsAdd(sds, SDS{"err": err}), "")
 502                 state.dirUnlock()
 503                 return nil, err
 504         }
 505         ctx.LogD("sp-start", sds, "starting workers")
 506         err = state.StartWorkers(conn, infosPayloads, payload)
 507         if err != nil {
 508                 state.dirUnlock()
 509                 return nil, err
 510         }
 511         return &state, err
 512 }
 513
 514 func (state *SPState) StartWorkers(
 515         conn ConnDeadlined,
 516         infosPayloads [][]byte,
 517         payload []byte) error {
 518         sds := SDS{"node": state.Node.Id, "nice": strconv.Itoa(int(state.nice))}
 519         if len(infosPayloads) > 1 {
 520                 go func() {
 521                         for _, payload := range infosPayloads[1:] {
 522                                 state.ctx.LogD(
 523                                         "sp-work",
 524                                         SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
 525                                         "queuing remaining payload",
 526                                 )
 527                                 state.payloads <- payload
 528                         }
 529                 }()
 530         }
 531         state.ctx.LogD(
 532                 "sp-work",
 533                 SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
 534                 "processing first payload",
 535         )
 536         replies, err := state.ProcessSP(payload)
 537         if err != nil {
 538                 state.ctx.LogE("sp-work", SdsAdd(sds, SDS{"err": err}), "")
 539                 return err
 540         }
 541
 542         go func() {
 543                 for _, reply := range replies {
 544                         state.ctx.LogD(
 545                                 "sp-work",
 546                                 SdsAdd(sds, SDS{"size": strconv.Itoa(len(reply))}),
 547                                 "queuing reply",
 548                         )
 549                         state.payloads <- reply
 550                 }
 551         }()
 552
 553         if !state.listOnly && (state.xxOnly == "" || state.xxOnly == TTx) {
 554                 go func() {
 555                         for range time.Tick(time.Second) {
 556                                 if state.NotAlive() {
 557                                         return
 558                                 }
 559                                 for _, payload := range state.ctx.infosOur(
 560                                         state.Node.Id,
 561                                         state.nice,
 562                                         &state.infosOurSeen,
 563                                 ) {
 564                                         state.ctx.LogD(
 565                                                 "sp-work",
 566                                                 SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
 567                                                 "queuing new info",
 568                                         )
 569                                         state.payloads <- payload
 570                                 }
 571                         }
 572                 }()
 573         }
 574
 575         state.wg.Add(1)
 576         go func() {
 577                 defer func() {
 578                         state.isDead = true
 579                         state.wg.Done()
 580                 }()
 581                 for {
 582                         if state.NotAlive() {
 583                                 return
 584                         }
 585                         var payload []byte
 586                         select {
 587                         case payload = <-state.payloads:
 588                                 state.ctx.LogD(
 589                                         "sp-xmit",
 590                                         SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
 591                                         "got payload",
 592                                 )
 593                         default:
 594                         }
 595                         if payload == nil {
 596                                 state.RLock()
 597                                 if len(state.queueTheir) == 0 {
 598                                         state.ctx.LogD("sp-xmit", sds, "file queue is empty")
 599                                         state.RUnlock()
 600                                         time.Sleep(100 * time.Millisecond)
 601                                         continue
 602                                 }
 603                                 freq := state.queueTheir[0].freq
 604                                 state.RUnlock()
 605
 606                                 if state.txRate > 0 {
 607                                         time.Sleep(time.Second / time.Duration(state.txRate))
 608                                 }
 609
 610                                 sdsp := SdsAdd(sds, SDS{
 611                                         "xx":   string(TTx),
 612                                         "hash": ToBase32(freq.Hash[:]),
 613                                         "size": strconv.FormatInt(int64(freq.Offset), 10),
 614                                 })
 615                                 state.ctx.LogD("sp-file", sdsp, "queueing")
 616                                 fd, err := os.Open(filepath.Join(
 617                                         state.ctx.Spool,
 618                                         state.Node.Id.String(),
 619                                         string(TTx),
 620                                         ToBase32(freq.Hash[:]),
 621                                 ))
 622                                 if err != nil {
 623                                         state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
 624                                         break
 625                                 }
 626                                 fi, err := fd.Stat()
 627                                 if err != nil {
 628                                         state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
 629                                         break
 630                                 }
 631                                 fullSize := uint64(fi.Size())
 632                                 var buf []byte
 633                                 if freq.Offset < fullSize {
 634                                         state.ctx.LogD("sp-file", sdsp, "seeking")
 635                                         if _, err = fd.Seek(int64(freq.Offset), io.SeekStart); err != nil {
 636                                                 state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
 637                                                 break
 638                                         }
 639                                         buf = make([]byte, MaxSPSize-SPHeadOverhead-SPFileOverhead)
 640                                         n, err := fd.Read(buf)
 641                                         if err != nil {
 642                                                 state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
 643                                                 break
 644                                         }
 645                                         buf = buf[:n]
 646                                         state.ctx.LogD(
 647                                                 "sp-file",
 648                                                 SdsAdd(sdsp, SDS{"size": strconv.Itoa(n)}),
 649                                                 "read",
 650                                         )
 651                                 }
 652                                 fd.Close()
 653                                 payload = MarshalSP(SPTypeFile, SPFile{
 654                                         Hash:    freq.Hash,
 655                                         Offset:  freq.Offset,
 656                                         Payload: buf,
 657                                 })
 658                                 ourSize := freq.Offset + uint64(len(buf))
 659                                 sdsp["size"] = strconv.FormatInt(int64(ourSize), 10)
 660                                 sdsp["fullsize"] = strconv.FormatInt(int64(fullSize), 10)
 661                                 state.ctx.LogP("sp-file", sdsp, "")
 662                                 state.Lock()
 663                                 if len(state.queueTheir) > 0 && *state.queueTheir[0].freq.Hash == *freq.Hash {
 664                                         if ourSize == fullSize {
 665                                                 state.ctx.LogD("sp-file", sdsp, "finished")
 666                                                 if len(state.queueTheir) > 1 {
 667                                                         state.queueTheir = state.queueTheir[1:]
 668                                                 } else {
 669                                                         state.queueTheir = state.queueTheir[:0]
 670                                                 }
 671                                         } else {
 672                                                 state.queueTheir[0].freq.Offset += uint64(len(buf))
 673                                         }
 674                                 } else {
 675                                         state.ctx.LogD("sp-file", sdsp, "queue disappeared")
 676                                 }
 677                                 state.Unlock()
 678                         }
 679                         state.ctx.LogD(
 680                                 "sp-xmit",
 681                                 SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
 682                                 "sending",
 683                         )
 684                         conn.SetWriteDeadline(time.Now().Add(DefaultDeadline * time.Second))
 685                         if err := state.WriteSP(conn, state.csOur.Encrypt(nil, nil, payload)); err != nil {
 686                                 state.ctx.LogE("sp-xmit", SdsAdd(sds, SDS{"err": err}), "")
 687                                 break
 688                         }
 689                 }
 690         }()
 691
 692         state.wg.Add(1)
 693         go func() {
 694                 defer func() {
 695                         state.isDead = true
 696                         state.wg.Done()
 697                 }()
 698                 for {
 699                         if state.NotAlive() {
 700                                 return
 701                         }
 702                         state.ctx.LogD("sp-recv", sds, "waiting for payload")
 703                         conn.SetReadDeadline(time.Now().Add(DefaultDeadline * time.Second))
 704                         payload, err := state.ReadSP(conn)
 705                         if err != nil {
 706                                 unmarshalErr := err.(*xdr.UnmarshalError)
 707                                 netErr, ok := unmarshalErr.Err.(net.Error)
 708                                 if ok && netErr.Timeout() {
 709                                         continue
 710                                 }
 711                                 if unmarshalErr.ErrorCode == xdr.ErrIO {
 712                                         break
 713                                 }
 714                                 state.ctx.LogE("sp-recv", SdsAdd(sds, SDS{"err": err}), "")
 715                                 break
 716                         }
 717                         state.ctx.LogD(
 718                                 "sp-recv",
 719                                 SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
 720                                 "got payload",
 721                         )
 722                         payload, err = state.csTheir.Decrypt(nil, nil, payload)
 723                         if err != nil {
 724                                 state.ctx.LogE("sp-recv", SdsAdd(sds, SDS{"err": err}), "")
 725                                 break
 726                         }
 727                         state.ctx.LogD(
 728                                 "sp-recv",
 729                                 SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
 730                                 "processing",
 731                         )
 732                         replies, err := state.ProcessSP(payload)
 733                         if err != nil {
 734                                 state.ctx.LogE("sp-recv", SdsAdd(sds, SDS{"err": err}), "")
 735                                 break
 736                         }
 737                         go func() {
 738                                 for _, reply := range replies {
 739                                         state.ctx.LogD(
 740                                                 "sp-recv",
 741                                                 SdsAdd(sds, SDS{"size": strconv.Itoa(len(reply))}),
 742                                                 "queuing reply",
 743                                         )
 744                                         state.payloads <- reply
 745                                 }
 746                         }()
 747                         if state.rxRate > 0 {
 748                                 time.Sleep(time.Second / time.Duration(state.rxRate))
 749                         }
 750                 }
 751         }()
 752
 753         return nil
 754 }
 755
 756 func (state *SPState) Wait() {
 757         state.wg.Wait()
 758         state.dirUnlock()
 759         state.Duration = time.Now().Sub(state.started)
 760         state.RxSpeed = state.RxBytes
 761         state.TxSpeed = state.TxBytes
 762         rxDuration := int64(state.RxLastSeen.Sub(state.started).Seconds())
 763         txDuration := int64(state.TxLastSeen.Sub(state.started).Seconds())
 764         if rxDuration > 0 {
 765                 state.RxSpeed = state.RxBytes / rxDuration
 766         }
 767         if txDuration > 0 {
 768                 state.TxSpeed = state.TxBytes / txDuration
 769         }
 770 }
 771
 772 func (state *SPState) ProcessSP(payload []byte) ([][]byte, error) {
 773         sds := SDS{"node": state.Node.Id, "nice": strconv.Itoa(int(state.nice))}
 774         r := bytes.NewReader(payload)
 775         var err error
 776         var replies [][]byte
 777         var infosGot bool
 778         for r.Len() > 0 {
 779                 state.ctx.LogD("sp-process", sds, "unmarshaling header")
 780                 var head SPHead
 781                 if _, err = xdr.Unmarshal(r, &head); err != nil {
 782                         state.ctx.LogE("sp-process", SdsAdd(sds, SDS{"err": err}), "")
 783                         return nil, err
 784                 }
 785                 switch head.Type {
 786                 case SPTypeInfo:
 787                         infosGot = true
 788                         sdsp := SdsAdd(sds, SDS{"type": "info"})
 789                         state.ctx.LogD("sp-process", sdsp, "unmarshaling packet")
 790                         var info SPInfo
 791                         if _, err = xdr.Unmarshal(r, &info); err != nil {
 792                                 state.ctx.LogE("sp-process", SdsAdd(sdsp, SDS{"err": err}), "")
 793                                 return nil, err
 794                         }
 795                         sdsp = SdsAdd(sds, SDS{
 796                                 "hash": ToBase32(info.Hash[:]),
 797                                 "size": strconv.FormatInt(int64(info.Size), 10),
 798                                 "nice": strconv.Itoa(int(info.Nice)),
 799                         })
 800                         if !state.listOnly && info.Nice > state.nice {
 801                                 state.ctx.LogD("sp-process", sdsp, "too nice")
 802                                 continue
 803                         }
 804                         state.ctx.LogD("sp-process", sdsp, "received")
 805                         if !state.listOnly && state.xxOnly == TTx {
 806                                 continue
 807                         }
 808                         state.Lock()
 809                         state.infosTheir[*info.Hash] = &info
 810                         state.Unlock()
 811                         state.ctx.LogD("sp-process", sdsp, "stating part")
 812                         pktPath := filepath.Join(
 813                                 state.ctx.Spool,
 814                                 state.Node.Id.String(),
 815                                 string(TRx),
 816                                 ToBase32(info.Hash[:]),
 817                         )
 818                         if _, err = os.Stat(pktPath); err == nil {
 819                                 state.ctx.LogI("sp-info", sdsp, "already done")
 820                                 if !state.listOnly {
 821                                         replies = append(replies, MarshalSP(SPTypeDone, SPDone{info.Hash}))
 822                                 }
 823                                 continue
 824                         }
 825                         if _, err = os.Stat(pktPath + SeenSuffix); err == nil {
 826                                 state.ctx.LogI("sp-info", sdsp, "already seen")
 827                                 if !state.listOnly {
 828                                         replies = append(replies, MarshalSP(SPTypeDone, SPDone{info.Hash}))
 829                                 }
 830                                 continue
 831                         }
 832                         fi, err := os.Stat(pktPath + PartSuffix)
 833                         var offset int64
 834                         if err == nil {
 835                                 offset = fi.Size()
 836                         }
 837                         if !state.ctx.IsEnoughSpace(int64(info.Size) - offset) {
 838                                 state.ctx.LogI("sp-info", sdsp, "not enough space")
 839                                 continue
 840                         }
 841                         state.ctx.LogI(
 842                                 "sp-info",
 843                                 SdsAdd(sdsp, SDS{"offset": strconv.FormatInt(offset, 10)}),
 844                                 "",
 845                         )
 846                         if !state.listOnly && (state.onlyPkts == nil || state.onlyPkts[*info.Hash]) {
 847                                 replies = append(replies, MarshalSP(
 848                                         SPTypeFreq,
 849                                         SPFreq{info.Hash, uint64(offset)},
 850                                 ))
 851                         }
 852                 case SPTypeFile:
 853                         sdsp := SdsAdd(sds, SDS{"type": "file"})
 854                         state.ctx.LogD("sp-process", sdsp, "unmarshaling packet")
 855                         var file SPFile
 856                         if _, err = xdr.Unmarshal(r, &file); err != nil {
 857                                 state.ctx.LogE("sp-process", SdsAdd(sds, SDS{
 858                                         "err":  err,
 859                                         "type": "file",
 860                                 }), "")
 861                                 return nil, err
 862                         }
 863                         sdsp["xx"] = string(TRx)
 864                         sdsp["hash"] = ToBase32(file.Hash[:])
 865                         sdsp["size"] = strconv.Itoa(len(file.Payload))
 866                         filePath := filepath.Join(
 867                                 state.ctx.Spool,
 868                                 state.Node.Id.String(),
 869                                 string(TRx),
 870                                 ToBase32(file.Hash[:]),
 871                         )
 872                         state.ctx.LogD("sp-file", sdsp, "opening part")
 873                         fd, err := os.OpenFile(
 874                                 filePath+PartSuffix,
 875                                 os.O_RDWR|os.O_CREATE,
 876                                 os.FileMode(0600),
 877                         )
 878                         if err != nil {
 879                                 state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
 880                                 return nil, err
 881                         }
 882                         state.ctx.LogD(
 883                                 "sp-file",
 884                                 SdsAdd(sdsp, SDS{"offset": strconv.FormatInt(int64(file.Offset), 10)}),
 885                                 "seeking",
 886                         )
 887                         if _, err = fd.Seek(int64(file.Offset), io.SeekStart); err != nil {
 888                                 state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
 889                                 fd.Close()
 890                                 return nil, err
 891                         }
 892                         state.ctx.LogD("sp-file", sdsp, "writing")
 893                         _, err = fd.Write(file.Payload)
 894                         if err != nil {
 895                                 state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
 896                                 fd.Close()
 897                                 return nil, err
 898                         }
 899                         ourSize := uint64(file.Offset) + uint64(len(file.Payload))
 900                         state.RLock()
 901                         sdsp["fullsize"] = strconv.FormatInt(int64(state.infosTheir[*file.Hash].Size), 10)
 902                         sdsp["size"] = strconv.FormatInt(int64(ourSize), 10)
 903                         state.ctx.LogP("sp-file", sdsp, "")
 904                         if state.infosTheir[*file.Hash].Size != ourSize {
 905                                 state.RUnlock()
 906                                 fd.Close()
 907                                 continue
 908                         }
 909                         state.RUnlock()
 910                         spWorkersGroup.Wait()
 911                         spWorkersGroup.Add(1)
 912                         go func() {
 913                                 if err := fd.Sync(); err != nil {
 914                                         state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "sync")
 915                                         fd.Close()
 916                                         return
 917                                 }
 918                                 state.wg.Add(1)
 919                                 defer state.wg.Done()
 920                                 fd.Seek(0, io.SeekStart)
 921                                 state.ctx.LogD("sp-file", sdsp, "checking")
 922                                 gut, err := Check(fd, file.Hash[:])
 923                                 fd.Close()
 924                                 if err != nil || !gut {
 925                                         state.ctx.LogE("sp-file", sdsp, "checksum mismatch")
 926                                         return
 927                                 }
 928                                 state.ctx.LogI("sp-done", SdsAdd(sdsp, SDS{"xx": string(TRx)}), "")
 929                                 os.Rename(filePath+PartSuffix, filePath)
 930                                 state.Lock()
 931                                 delete(state.infosTheir, *file.Hash)
 932                                 state.Unlock()
 933                                 spWorkersGroup.Done()
 934                                 go func() {
 935                                         state.payloads <- MarshalSP(SPTypeDone, SPDone{file.Hash})
 936                                 }()
 937                         }()
 938                 case SPTypeDone:
 939                         sdsp := SdsAdd(sds, SDS{"type": "done"})
 940                         state.ctx.LogD("sp-process", sdsp, "unmarshaling packet")
 941                         var done SPDone
 942                         if _, err = xdr.Unmarshal(r, &done); err != nil {
 943                                 state.ctx.LogE("sp-process", SdsAdd(sds, SDS{
 944                                         "type": "done",
 945                                         "err":  err,
 946                                 }), "")
 947                                 return nil, err
 948                         }
 949                         sdsp["hash"] = ToBase32(done.Hash[:])
 950                         state.ctx.LogD("sp-done", sdsp, "removing")
 951                         err := os.Remove(filepath.Join(
 952                                 state.ctx.Spool,
 953                                 state.Node.Id.String(),
 954                                 string(TTx),
 955                                 ToBase32(done.Hash[:]),
 956                         ))
 957                         sdsp["xx"] = string(TTx)
 958                         if err == nil {
 959                                 state.ctx.LogI("sp-done", sdsp, "")
 960                         } else {
 961                                 state.ctx.LogE("sp-done", sdsp, "")
 962                         }
 963                 case SPTypeFreq:
 964                         sdsp := SdsAdd(sds, SDS{"type": "freq"})
 965                         state.ctx.LogD("sp-process", sdsp, "unmarshaling packet")
 966                         var freq SPFreq
 967                         if _, err = xdr.Unmarshal(r, &freq); err != nil {
 968                                 state.ctx.LogE("sp-process", SdsAdd(sdsp, SDS{"err": err}), "")
 969                                 return nil, err
 970                         }
 971                         sdsp["hash"] = ToBase32(freq.Hash[:])
 972                         sdsp["offset"] = strconv.FormatInt(int64(freq.Offset), 10)
 973                         state.ctx.LogD("sp-process", sdsp, "queueing")
 974                         nice, exists := state.infosOurSeen[*freq.Hash]
 975                         if exists {
 976                                 state.Lock()
 977                                 insertIdx := 0
 978                                 var freqWithNice *FreqWithNice
 979                                 for insertIdx, freqWithNice = range state.queueTheir {
 980                                         if freqWithNice.nice > nice {
 981                                                 break
 982                                         }
 983                                 }
 984                                 state.queueTheir = append(state.queueTheir, nil)
 985                                 copy(state.queueTheir[insertIdx+1:], state.queueTheir[insertIdx:])
 986                                 state.queueTheir[insertIdx] = &FreqWithNice{&freq, nice}
 987                                 state.Unlock()
 988                         } else {
 989                                 state.ctx.LogD("sp-process", sdsp, "unknown")
 990                         }
 991                 case SPTypeHalt:
 992                         state.ctx.LogD("sp-process", SdsAdd(sds, SDS{"type": "halt"}), "")
 993                         state.Lock()
 994                         state.queueTheir = nil
 995                         state.Unlock()
 996                 default:
 997                         state.ctx.LogE(
 998                                 "sp-process",
 999                                 SdsAdd(sds, SDS{"type": head.Type}),
1000                                 "unknown",
1001                         )
1002                         return nil, BadPktType
1003                 }
1004         }
1005         if infosGot {
1006                 var pkts int
1007                 var size uint64
1008                 state.RLock()
1009                 for _, info := range state.infosTheir {
1010                         pkts++
1011                         size += info.Size
1012                 }
1013                 state.RUnlock()
1014                 state.ctx.LogI("sp-infos", SDS{
1015                         "xx":   string(TRx),
1016                         "node": state.Node.Id,
1017                         "pkts": strconv.Itoa(pkts),
1018                         "size": strconv.FormatInt(int64(size), 10),
1019                 }, "")
1020         }
1021         return payloadsSplit(replies), nil
1022 }