src/sp.go

   1 /*
   2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
   3 Copyright (C) 2016-2021 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, version 3 of the License.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18 package nncp
  19
  20 import (
  21         "bytes"
  22         "crypto/subtle"
  23         "errors"
  24         "fmt"
  25         "io"
  26         "os"
  27         "path/filepath"
  28         "sort"
  29         "sync"
  30         "time"
  31
  32         xdr "github.com/davecgh/go-xdr/xdr2"
  33         "github.com/dustin/go-humanize"
  34         "github.com/flynn/noise"
  35 )
  36
  37 const (
  38         MaxSPSize      = 1<<16 - 256
  39         PartSuffix     = ".part"
  40         SPHeadOverhead = 4
  41 )
  42
  43 type MTHAndOffset struct {
  44         mth    MTH
  45         offset uint64
  46 }
  47
  48 type SPCheckerTask struct {
  49         nodeId *NodeId
  50         hsh    *[MTHSize]byte
  51         mth    MTH
  52         done   chan []byte
  53 }
  54
  55 var (
  56         SPInfoOverhead    int
  57         SPFreqOverhead    int
  58         SPFileOverhead    int
  59         SPHaltMarshalized []byte
  60         SPPingMarshalized []byte
  61
  62         NoiseCipherSuite noise.CipherSuite = noise.NewCipherSuite(
  63                 noise.DH25519,
  64                 noise.CipherChaChaPoly,
  65                 noise.HashBLAKE2b,
  66         )
  67
  68         DefaultDeadline = 10 * time.Second
  69         PingTimeout     = time.Minute
  70
  71         spCheckerTasks chan SPCheckerTask
  72         SPCheckerWg    sync.WaitGroup
  73         spCheckerOnce  sync.Once
  74 )
  75
  76 type FdAndFullSize struct {
  77         fd       *os.File
  78         fullSize int64
  79 }
  80
  81 type SPType uint8
  82
  83 const (
  84         SPTypeInfo SPType = iota
  85         SPTypeFreq SPType = iota
  86         SPTypeFile SPType = iota
  87         SPTypeDone SPType = iota
  88         SPTypeHalt SPType = iota
  89         SPTypePing SPType = iota
  90 )
  91
  92 type SPHead struct {
  93         Type SPType
  94 }
  95
  96 type SPInfo struct {
  97         Nice uint8
  98         Size uint64
  99         Hash *[MTHSize]byte
 100 }
 101
 102 type SPFreq struct {
 103         Hash   *[MTHSize]byte
 104         Offset uint64
 105 }
 106
 107 type SPFile struct {
 108         Hash    *[MTHSize]byte
 109         Offset  uint64
 110         Payload []byte
 111 }
 112
 113 type SPDone struct {
 114         Hash *[MTHSize]byte
 115 }
 116
 117 type SPRaw struct {
 118         Magic   [8]byte
 119         Payload []byte
 120 }
 121
 122 type FreqWithNice struct {
 123         freq *SPFreq
 124         nice uint8
 125 }
 126
 127 type ConnDeadlined interface {
 128         io.ReadWriteCloser
 129         SetReadDeadline(t time.Time) error
 130         SetWriteDeadline(t time.Time) error
 131 }
 132
 133 func init() {
 134         var buf bytes.Buffer
 135         spHead := SPHead{Type: SPTypeHalt}
 136         if _, err := xdr.Marshal(&buf, spHead); err != nil {
 137                 panic(err)
 138         }
 139         SPHaltMarshalized = make([]byte, SPHeadOverhead)
 140         copy(SPHaltMarshalized, buf.Bytes())
 141         buf.Reset()
 142
 143         spHead = SPHead{Type: SPTypePing}
 144         if _, err := xdr.Marshal(&buf, spHead); err != nil {
 145                 panic(err)
 146         }
 147         SPPingMarshalized = make([]byte, SPHeadOverhead)
 148         copy(SPPingMarshalized, buf.Bytes())
 149         buf.Reset()
 150
 151         spInfo := SPInfo{Nice: 123, Size: 123, Hash: new([MTHSize]byte)}
 152         if _, err := xdr.Marshal(&buf, spInfo); err != nil {
 153                 panic(err)
 154         }
 155         SPInfoOverhead = buf.Len()
 156         buf.Reset()
 157
 158         spFreq := SPFreq{Hash: new([MTHSize]byte), Offset: 123}
 159         if _, err := xdr.Marshal(&buf, spFreq); err != nil {
 160                 panic(err)
 161         }
 162         SPFreqOverhead = buf.Len()
 163         buf.Reset()
 164
 165         spFile := SPFile{Hash: new([MTHSize]byte), Offset: 123}
 166         if _, err := xdr.Marshal(&buf, spFile); err != nil {
 167                 panic(err)
 168         }
 169         SPFileOverhead = buf.Len()
 170         spCheckerTasks = make(chan SPCheckerTask)
 171 }
 172
 173 func MarshalSP(typ SPType, sp interface{}) []byte {
 174         var buf bytes.Buffer
 175         if _, err := xdr.Marshal(&buf, SPHead{typ}); err != nil {
 176                 panic(err)
 177         }
 178         if _, err := xdr.Marshal(&buf, sp); err != nil {
 179                 panic(err)
 180         }
 181         return buf.Bytes()
 182 }
 183
 184 func payloadsSplit(payloads [][]byte) [][]byte {
 185         var outbounds [][]byte
 186         outbound := make([]byte, 0, MaxSPSize)
 187         for i, payload := range payloads {
 188                 outbound = append(outbound, payload...)
 189                 if i+1 < len(payloads) && len(outbound)+len(payloads[i+1]) > MaxSPSize {
 190                         outbounds = append(outbounds, outbound)
 191                         outbound = make([]byte, 0, MaxSPSize)
 192                 }
 193         }
 194         if len(outbound) > 0 {
 195                 outbounds = append(outbounds, outbound)
 196         }
 197         return outbounds
 198 }
 199
 200 type SPState struct {
 201         Ctx            *Ctx
 202         Node           *Node
 203         Nice           uint8
 204         NoCK           bool
 205         onlineDeadline time.Duration
 206         maxOnlineTime  time.Duration
 207         hs             *noise.HandshakeState
 208         csOur          *noise.CipherState
 209         csTheir        *noise.CipherState
 210         payloads       chan []byte
 211         pings          chan struct{}
 212         infosTheir     map[[MTHSize]byte]*SPInfo
 213         infosOurSeen   map[[MTHSize]byte]uint8
 214         queueTheir     []*FreqWithNice
 215         wg             sync.WaitGroup
 216         RxBytes        int64
 217         RxLastSeen     time.Time
 218         RxLastNonPing  time.Time
 219         TxBytes        int64
 220         TxLastSeen     time.Time
 221         TxLastNonPing  time.Time
 222         started        time.Time
 223         mustFinishAt   time.Time
 224         Duration       time.Duration
 225         RxSpeed        int64
 226         TxSpeed        int64
 227         rxLock         *os.File
 228         txLock         *os.File
 229         xxOnly         TRxTx
 230         rxRate         int
 231         txRate         int
 232         isDead         chan struct{}
 233         listOnly       bool
 234         onlyPkts       map[[MTHSize]byte]bool
 235         writeSPBuf     bytes.Buffer
 236         fds            map[string]FdAndFullSize
 237         fdsLock        sync.RWMutex
 238         fileHashers    map[string]*MTHAndOffset
 239         progressBars   map[string]struct{}
 240         sync.RWMutex
 241 }
 242
 243 func (state *SPState) SetDead() {
 244         state.Lock()
 245         defer state.Unlock()
 246         select {
 247         case <-state.isDead:
 248                 // Already closed channel, dead
 249                 return
 250         default:
 251         }
 252         close(state.isDead)
 253         go func() {
 254                 for range state.payloads {
 255                 }
 256         }()
 257         go func() {
 258                 for range state.pings {
 259                 }
 260         }()
 261 }
 262
 263 func (state *SPState) NotAlive() bool {
 264         select {
 265         case <-state.isDead:
 266                 return true
 267         default:
 268         }
 269         return false
 270 }
 271
 272 func (state *SPState) dirUnlock() {
 273         state.Ctx.UnlockDir(state.rxLock)
 274         state.Ctx.UnlockDir(state.txLock)
 275 }
 276
 277 func (state *SPState) WriteSP(dst io.Writer, payload []byte, ping bool) error {
 278         state.writeSPBuf.Reset()
 279         n, err := xdr.Marshal(&state.writeSPBuf, SPRaw{
 280                 Magic:   MagicNNCPSv1.B,
 281                 Payload: payload,
 282         })
 283         if err != nil {
 284                 return err
 285         }
 286         if n, err = dst.Write(state.writeSPBuf.Bytes()); err == nil {
 287                 state.TxLastSeen = time.Now()
 288                 state.TxBytes += int64(n)
 289                 if !ping {
 290                         state.TxLastNonPing = state.TxLastSeen
 291                 }
 292         }
 293         return err
 294 }
 295
 296 func (state *SPState) ReadSP(src io.Reader) ([]byte, error) {
 297         var sp SPRaw
 298         n, err := xdr.UnmarshalLimited(src, &sp, 1<<17)
 299         if err != nil {
 300                 ue := err.(*xdr.UnmarshalError)
 301                 if ue.Err == io.EOF {
 302                         return nil, ue.Err
 303                 }
 304                 return nil, err
 305         }
 306         state.RxLastSeen = time.Now()
 307         state.RxBytes += int64(n)
 308         if sp.Magic != MagicNNCPSv1.B {
 309                 return nil, BadMagic
 310         }
 311         return sp.Payload, nil
 312 }
 313
 314 func (ctx *Ctx) infosOur(nodeId *NodeId, nice uint8, seen *map[[MTHSize]byte]uint8) [][]byte {
 315         var infos []*SPInfo
 316         var totalSize int64
 317         for job := range ctx.Jobs(nodeId, TTx) {
 318                 if job.PktEnc.Nice > nice {
 319                         continue
 320                 }
 321                 if _, known := (*seen)[*job.HshValue]; known {
 322                         continue
 323                 }
 324                 totalSize += job.Size
 325                 infos = append(infos, &SPInfo{
 326                         Nice: job.PktEnc.Nice,
 327                         Size: uint64(job.Size),
 328                         Hash: job.HshValue,
 329                 })
 330                 (*seen)[*job.HshValue] = job.PktEnc.Nice
 331         }
 332         sort.Sort(ByNice(infos))
 333         var payloads [][]byte
 334         for _, info := range infos {
 335                 payloads = append(payloads, MarshalSP(SPTypeInfo, info))
 336                 pktName := Base32Codec.EncodeToString(info.Hash[:])
 337                 ctx.LogD("sp-info-our", LEs{
 338                         {"Node", nodeId},
 339                         {"Name", pktName},
 340                         {"Size", info.Size},
 341                 }, func(les LEs) string {
 342                         return fmt.Sprintf(
 343                                 "Our info: %s/tx/%s (%s)",
 344                                 ctx.NodeName(nodeId),
 345                                 pktName,
 346                                 humanize.IBytes(info.Size),
 347                         )
 348                 })
 349         }
 350         if totalSize > 0 {
 351                 ctx.LogI("sp-infos-tx", LEs{
 352                         {"XX", string(TTx)},
 353                         {"Node", nodeId},
 354                         {"Pkts", len(payloads)},
 355                         {"Size", totalSize},
 356                 }, func(les LEs) string {
 357                         return fmt.Sprintf(
 358                                 "We have got for %s: %d packets, %s",
 359                                 ctx.NodeName(nodeId),
 360                                 len(payloads),
 361                                 humanize.IBytes(uint64(totalSize)),
 362                         )
 363                 })
 364         }
 365         return payloadsSplit(payloads)
 366 }
 367
 368 func (state *SPState) StartI(conn ConnDeadlined) error {
 369         nodeId := state.Node.Id
 370         err := state.Ctx.ensureRxDir(nodeId)
 371         if err != nil {
 372                 return err
 373         }
 374         var rxLock *os.File
 375         if !state.listOnly && (state.xxOnly == "" || state.xxOnly == TRx) {
 376                 rxLock, err = state.Ctx.LockDir(nodeId, string(TRx))
 377                 if err != nil {
 378                         return err
 379                 }
 380         }
 381         var txLock *os.File
 382         if !state.listOnly && (state.xxOnly == "" || state.xxOnly == TTx) {
 383                 txLock, err = state.Ctx.LockDir(nodeId, string(TTx))
 384                 if err != nil {
 385                         return err
 386                 }
 387         }
 388         started := time.Now()
 389         conf := noise.Config{
 390                 CipherSuite: NoiseCipherSuite,
 391                 Pattern:     noise.HandshakeIK,
 392                 Initiator:   true,
 393                 StaticKeypair: noise.DHKey{
 394                         Private: state.Ctx.Self.NoisePrv[:],
 395                         Public:  state.Ctx.Self.NoisePub[:],
 396                 },
 397                 PeerStatic: state.Node.NoisePub[:],
 398         }
 399         hs, err := noise.NewHandshakeState(conf)
 400         if err != nil {
 401                 return err
 402         }
 403         state.hs = hs
 404         state.payloads = make(chan []byte)
 405         state.pings = make(chan struct{})
 406         state.infosTheir = make(map[[MTHSize]byte]*SPInfo)
 407         state.infosOurSeen = make(map[[MTHSize]byte]uint8)
 408         state.progressBars = make(map[string]struct{})
 409         state.started = started
 410         state.rxLock = rxLock
 411         state.txLock = txLock
 412
 413         var infosPayloads [][]byte
 414         if !state.listOnly && (state.xxOnly == "" || state.xxOnly == TTx) {
 415                 infosPayloads = state.Ctx.infosOur(nodeId, state.Nice, &state.infosOurSeen)
 416         }
 417         var firstPayload []byte
 418         if len(infosPayloads) > 0 {
 419                 firstPayload = infosPayloads[0]
 420         }
 421         // Pad first payload, to hide actual number of existing files
 422         for i := 0; i < (MaxSPSize-len(firstPayload))/SPHeadOverhead; i++ {
 423                 firstPayload = append(firstPayload, SPHaltMarshalized...)
 424         }
 425
 426         var buf []byte
 427         var payload []byte
 428         buf, _, _, err = state.hs.WriteMessage(nil, firstPayload)
 429         if err != nil {
 430                 state.dirUnlock()
 431                 return err
 432         }
 433         les := LEs{{"Node", nodeId}, {"Nice", int(state.Nice)}}
 434         state.Ctx.LogD("sp-startI", les, func(les LEs) string {
 435                 return fmt.Sprintf(
 436                         "SP with %s (nice %s): sending first message",
 437                         state.Node.Name,
 438                         NicenessFmt(state.Nice),
 439                 )
 440         })
 441         conn.SetWriteDeadline(time.Now().Add(DefaultDeadline)) // #nosec G104
 442         if err = state.WriteSP(conn, buf, false); err != nil {
 443                 state.Ctx.LogE("sp-startI", les, err, func(les LEs) string {
 444                         return fmt.Sprintf(
 445                                 "SP with %s (nice %s): writing",
 446                                 state.Node.Name,
 447                                 NicenessFmt(state.Nice),
 448                         )
 449                 })
 450                 state.dirUnlock()
 451                 return err
 452         }
 453         state.Ctx.LogD("sp-startI-wait", les, func(les LEs) string {
 454                 return fmt.Sprintf(
 455                         "SP with %s (nice %s): waiting for first message",
 456                         state.Node.Name,
 457                         NicenessFmt(state.Nice),
 458                 )
 459         })
 460         conn.SetReadDeadline(time.Now().Add(DefaultDeadline)) // #nosec G104
 461         if buf, err = state.ReadSP(conn); err != nil {
 462                 state.Ctx.LogE("sp-startI-read", les, err, func(les LEs) string {
 463                         return fmt.Sprintf(
 464                                 "SP with %s (nice %s): reading",
 465                                 state.Node.Name,
 466                                 NicenessFmt(state.Nice),
 467                         )
 468                 })
 469                 state.dirUnlock()
 470                 return err
 471         }
 472         payload, state.csOur, state.csTheir, err = state.hs.ReadMessage(nil, buf)
 473         if err != nil {
 474                 state.Ctx.LogE("sp-startI-read", les, err, func(les LEs) string {
 475                         return fmt.Sprintf(
 476                                 "SP with %s (nice %s): reading Noise message",
 477                                 state.Node.Name,
 478                                 NicenessFmt(state.Nice),
 479                         )
 480                 })
 481                 state.dirUnlock()
 482                 return err
 483         }
 484         state.Ctx.LogD("sp-startI-workers", les, func(les LEs) string {
 485                 return fmt.Sprintf(
 486                         "SP with %s (nice %s): starting workers",
 487                         state.Node.Name,
 488                         NicenessFmt(state.Nice),
 489                 )
 490         })
 491         err = state.StartWorkers(conn, infosPayloads, payload)
 492         if err != nil {
 493                 state.Ctx.LogE("sp-startI-workers", les, err, func(les LEs) string {
 494                         return fmt.Sprintf(
 495                                 "SP with %s (nice %s): starting workers",
 496                                 state.Node.Name,
 497                                 NicenessFmt(state.Nice),
 498                         )
 499                 })
 500                 state.dirUnlock()
 501         }
 502         return err
 503 }
 504
 505 func (state *SPState) StartR(conn ConnDeadlined) error {
 506         started := time.Now()
 507         conf := noise.Config{
 508                 CipherSuite: NoiseCipherSuite,
 509                 Pattern:     noise.HandshakeIK,
 510                 Initiator:   false,
 511                 StaticKeypair: noise.DHKey{
 512                         Private: state.Ctx.Self.NoisePrv[:],
 513                         Public:  state.Ctx.Self.NoisePub[:],
 514                 },
 515         }
 516         hs, err := noise.NewHandshakeState(conf)
 517         if err != nil {
 518                 return err
 519         }
 520         xxOnly := TRxTx("")
 521         state.hs = hs
 522         state.payloads = make(chan []byte)
 523         state.pings = make(chan struct{})
 524         state.infosOurSeen = make(map[[MTHSize]byte]uint8)
 525         state.infosTheir = make(map[[MTHSize]byte]*SPInfo)
 526         state.progressBars = make(map[string]struct{})
 527         state.started = started
 528         state.xxOnly = xxOnly
 529
 530         var buf []byte
 531         var payload []byte
 532         logMsg := func(les LEs) string {
 533                 return fmt.Sprintf(
 534                         "SP nice %s: waiting for first message",
 535                         NicenessFmt(state.Nice),
 536                 )
 537         }
 538         les := LEs{{"Nice", int(state.Nice)}}
 539         state.Ctx.LogD("sp-startR", les, logMsg)
 540         conn.SetReadDeadline(time.Now().Add(DefaultDeadline)) // #nosec G104
 541         if buf, err = state.ReadSP(conn); err != nil {
 542                 state.Ctx.LogE("sp-startR-read", les, err, logMsg)
 543                 return err
 544         }
 545         if payload, _, _, err = state.hs.ReadMessage(nil, buf); err != nil {
 546                 state.Ctx.LogE("sp-startR-read", les, err, logMsg)
 547                 return err
 548         }
 549
 550         var node *Node
 551         for _, n := range state.Ctx.Neigh {
 552                 if subtle.ConstantTimeCompare(state.hs.PeerStatic(), n.NoisePub[:]) == 1 {
 553                         node = n
 554                         break
 555                 }
 556         }
 557         if node == nil {
 558                 peerId := Base32Codec.EncodeToString(state.hs.PeerStatic())
 559                 err = errors.New("unknown peer: " + peerId)
 560                 state.Ctx.LogE("sp-startR-unknown", append(les, LE{"Peer", peerId}), err, logMsg)
 561                 return err
 562         }
 563         state.Node = node
 564         state.rxRate = node.RxRate
 565         state.txRate = node.TxRate
 566         state.onlineDeadline = node.OnlineDeadline
 567         state.maxOnlineTime = node.MaxOnlineTime
 568         les = LEs{{"Node", node.Id}, {"Nice", int(state.Nice)}}
 569
 570         if err = state.Ctx.ensureRxDir(node.Id); err != nil {
 571                 return err
 572         }
 573         var rxLock *os.File
 574         if xxOnly == "" || xxOnly == TRx {
 575                 rxLock, err = state.Ctx.LockDir(node.Id, string(TRx))
 576                 if err != nil {
 577                         return err
 578                 }
 579         }
 580         state.rxLock = rxLock
 581         var txLock *os.File
 582         if xxOnly == "" || xxOnly == TTx {
 583                 txLock, err = state.Ctx.LockDir(node.Id, string(TTx))
 584                 if err != nil {
 585                         return err
 586                 }
 587         }
 588         state.txLock = txLock
 589
 590         var infosPayloads [][]byte
 591         if xxOnly == "" || xxOnly == TTx {
 592                 infosPayloads = state.Ctx.infosOur(node.Id, state.Nice, &state.infosOurSeen)
 593         }
 594         var firstPayload []byte
 595         if len(infosPayloads) > 0 {
 596                 firstPayload = infosPayloads[0]
 597         }
 598         // Pad first payload, to hide actual number of existing files
 599         for i := 0; i < (MaxSPSize-len(firstPayload))/SPHeadOverhead; i++ {
 600                 firstPayload = append(firstPayload, SPHaltMarshalized...)
 601         }
 602
 603         state.Ctx.LogD("sp-startR-write", les, func(les LEs) string {
 604                 return fmt.Sprintf(
 605                         "SP with %s (nice %s): sending first message",
 606                         node.Name, NicenessFmt(state.Nice),
 607                 )
 608         })
 609         buf, state.csTheir, state.csOur, err = state.hs.WriteMessage(nil, firstPayload)
 610         if err != nil {
 611                 state.dirUnlock()
 612                 return err
 613         }
 614         conn.SetWriteDeadline(time.Now().Add(DefaultDeadline)) // #nosec G104
 615         if err = state.WriteSP(conn, buf, false); err != nil {
 616                 state.Ctx.LogE("sp-startR-write", les, err, func(les LEs) string {
 617                         return fmt.Sprintf(
 618                                 "SP with %s (nice %s): writing",
 619                                 node.Name, NicenessFmt(state.Nice),
 620                         )
 621                 })
 622                 state.dirUnlock()
 623                 return err
 624         }
 625         state.Ctx.LogD("sp-startR-workers", les, func(les LEs) string {
 626                 return fmt.Sprintf(
 627                         "SP with %s (nice %s): starting workers",
 628                         node.Name, NicenessFmt(state.Nice),
 629                 )
 630         })
 631         err = state.StartWorkers(conn, infosPayloads, payload)
 632         if err != nil {
 633                 state.dirUnlock()
 634         }
 635         return err
 636 }
 637
 638 func (state *SPState) closeFd(pth string) {
 639         state.fdsLock.Lock()
 640         if s, exists := state.fds[pth]; exists {
 641                 delete(state.fds, pth)
 642                 s.fd.Close()
 643         }
 644         state.fdsLock.Unlock()
 645 }
 646
 647 func (state *SPState) StartWorkers(
 648         conn ConnDeadlined,
 649         infosPayloads [][]byte,
 650         payload []byte,
 651 ) error {
 652         les := LEs{{"Node", state.Node.Id}, {"Nice", int(state.Nice)}}
 653         state.fds = make(map[string]FdAndFullSize)
 654         state.fileHashers = make(map[string]*MTHAndOffset)
 655         state.isDead = make(chan struct{})
 656         if state.maxOnlineTime > 0 {
 657                 state.mustFinishAt = state.started.Add(state.maxOnlineTime)
 658         }
 659         if !state.NoCK {
 660                 spCheckerOnce.Do(func() { go SPChecker(state.Ctx) })
 661                 go func() {
 662                         for job := range state.Ctx.JobsNoCK(state.Node.Id) {
 663                                 if job.PktEnc.Nice <= state.Nice {
 664                                         spCheckerTasks <- SPCheckerTask{
 665                                                 nodeId: state.Node.Id,
 666                                                 hsh:    job.HshValue,
 667                                                 done:   state.payloads,
 668                                         }
 669                                 }
 670                         }
 671                 }()
 672         }
 673
 674         // Remaining handshake payload sending
 675         if len(infosPayloads) > 1 {
 676                 state.wg.Add(1)
 677                 go func() {
 678                         for _, payload := range infosPayloads[1:] {
 679                                 state.Ctx.LogD(
 680                                         "sp-queue-remaining",
 681                                         append(les, LE{"Size", int64(len(payload))}),
 682                                         func(les LEs) string {
 683                                                 return fmt.Sprintf(
 684                                                         "SP with %s (nice %s): queuing remaining payload (%s)",
 685                                                         state.Node.Name, NicenessFmt(state.Nice),
 686                                                         humanize.IBytes(uint64(len(payload))),
 687                                                 )
 688                                         },
 689                                 )
 690                                 state.payloads <- payload
 691                         }
 692                         state.wg.Done()
 693                 }()
 694         }
 695
 696         // Processing of first payload and queueing its responses
 697         logMsg := func(les LEs) string {
 698                 return fmt.Sprintf(
 699                         "SP with %s (nice %s): processing first payload (%s)",
 700                         state.Node.Name, NicenessFmt(state.Nice),
 701                         humanize.IBytes(uint64(len(payload))),
 702                 )
 703         }
 704         state.Ctx.LogD("sp-process", append(les, LE{"Size", int64(len(payload))}), logMsg)
 705         replies, err := state.ProcessSP(payload)
 706         if err != nil {
 707                 state.Ctx.LogE("sp-process", les, err, logMsg)
 708                 return err
 709         }
 710         state.wg.Add(1)
 711         go func() {
 712                 for _, reply := range replies {
 713                         state.Ctx.LogD(
 714                                 "sp-queue-reply",
 715                                 append(les, LE{"Size", int64(len(reply))}),
 716                                 func(les LEs) string {
 717                                         return fmt.Sprintf(
 718                                                 "SP with %s (nice %s): queuing reply (%s)",
 719                                                 state.Node.Name, NicenessFmt(state.Nice),
 720                                                 humanize.IBytes(uint64(len(payload))),
 721                                         )
 722                                 },
 723                         )
 724                         state.payloads <- reply
 725                 }
 726                 state.wg.Done()
 727         }()
 728
 729         // Periodic jobs
 730         state.wg.Add(1)
 731         go func() {
 732                 deadlineTicker := time.NewTicker(time.Second)
 733                 pingTicker := time.NewTicker(PingTimeout)
 734                 for {
 735                         select {
 736                         case <-state.isDead:
 737                                 state.wg.Done()
 738                                 deadlineTicker.Stop()
 739                                 pingTicker.Stop()
 740                                 return
 741                         case now := <-deadlineTicker.C:
 742                                 if now.Sub(state.RxLastNonPing) >= state.onlineDeadline &&
 743                                         now.Sub(state.TxLastNonPing) >= state.onlineDeadline {
 744                                         goto Deadlined
 745                                 }
 746                                 if state.maxOnlineTime > 0 && state.mustFinishAt.Before(now) {
 747                                         goto Deadlined
 748                                 }
 749                                 if now.Sub(state.RxLastSeen) >= 2*PingTimeout {
 750                                         goto Deadlined
 751                                 }
 752                                 break
 753                         Deadlined:
 754                                 state.SetDead()
 755                                 conn.Close() // #nosec G104
 756                         case now := <-pingTicker.C:
 757                                 if now.After(state.TxLastSeen.Add(PingTimeout)) {
 758                                         state.wg.Add(1)
 759                                         go func() {
 760                                                 state.pings <- struct{}{}
 761                                                 state.wg.Done()
 762                                         }()
 763                                 }
 764                         }
 765                 }
 766         }()
 767
 768         // Spool checker and INFOs sender of appearing files
 769         if !state.listOnly && (state.xxOnly == "" || state.xxOnly == TTx) {
 770                 state.wg.Add(1)
 771                 go func() {
 772                         ticker := time.NewTicker(time.Second)
 773                         for {
 774                                 select {
 775                                 case <-state.isDead:
 776                                         state.wg.Done()
 777                                         ticker.Stop()
 778                                         return
 779                                 case <-ticker.C:
 780                                         for _, payload := range state.Ctx.infosOur(
 781                                                 state.Node.Id,
 782                                                 state.Nice,
 783                                                 &state.infosOurSeen,
 784                                         ) {
 785                                                 state.Ctx.LogD(
 786                                                         "sp-queue-info",
 787                                                         append(les, LE{"Size", int64(len(payload))}),
 788                                                         func(les LEs) string {
 789                                                                 return fmt.Sprintf(
 790                                                                         "SP with %s (nice %s): queuing new info (%s)",
 791                                                                         state.Node.Name, NicenessFmt(state.Nice),
 792                                                                         humanize.IBytes(uint64(len(payload))),
 793                                                                 )
 794                                                         },
 795                                                 )
 796                                                 state.payloads <- payload
 797                                         }
 798                                 }
 799                         }
 800                 }()
 801         }
 802
 803         // Sender
 804         state.wg.Add(1)
 805         go func() {
 806                 defer conn.Close()
 807                 defer state.SetDead()
 808                 defer state.wg.Done()
 809                 buf := make([]byte, MaxSPSize-SPHeadOverhead-SPFileOverhead)
 810                 for {
 811                         if state.NotAlive() {
 812                                 return
 813                         }
 814                         var payload []byte
 815                         var ping bool
 816                         select {
 817                         case <-state.pings:
 818                                 state.Ctx.LogD("sp-got-ping", les, func(les LEs) string {
 819                                         return fmt.Sprintf(
 820                                                 "SP with %s (nice %s): got ping",
 821                                                 state.Node.Name, NicenessFmt(state.Nice),
 822                                         )
 823                                 })
 824                                 payload = SPPingMarshalized
 825                                 ping = true
 826                         case payload = <-state.payloads:
 827                                 state.Ctx.LogD(
 828                                         "sp-got-payload",
 829                                         append(les, LE{"Size", int64(len(payload))}),
 830                                         func(les LEs) string {
 831                                                 return fmt.Sprintf(
 832                                                         "SP with %s (nice %s): got payload (%s)",
 833                                                         state.Node.Name, NicenessFmt(state.Nice),
 834                                                         humanize.IBytes(uint64(len(payload))),
 835                                                 )
 836                                         },
 837                                 )
 838                         default:
 839                                 state.RLock()
 840                                 if len(state.queueTheir) == 0 {
 841                                         state.RUnlock()
 842                                         time.Sleep(100 * time.Millisecond)
 843                                         continue
 844                                 }
 845                                 freq := state.queueTheir[0].freq
 846                                 state.RUnlock()
 847                                 if state.txRate > 0 {
 848                                         time.Sleep(time.Second / time.Duration(state.txRate))
 849                                 }
 850                                 pktName := Base32Codec.EncodeToString(freq.Hash[:])
 851                                 lesp := append(
 852                                         les,
 853                                         LE{"XX", string(TTx)},
 854                                         LE{"Pkt", pktName},
 855                                         LE{"Size", int64(freq.Offset)},
 856                                 )
 857                                 logMsg := func(les LEs) string {
 858                                         return fmt.Sprintf(
 859                                                 "SP with %s (nice %s): tx/%s (%s)",
 860                                                 state.Node.Name, NicenessFmt(state.Nice),
 861                                                 pktName,
 862                                                 humanize.IBytes(freq.Offset),
 863                                         )
 864                                 }
 865                                 state.Ctx.LogD("sp-queue", lesp, func(les LEs) string {
 866                                         return logMsg(les) + ": queueing"
 867                                 })
 868                                 pth := filepath.Join(
 869                                         state.Ctx.Spool,
 870                                         state.Node.Id.String(),
 871                                         string(TTx),
 872                                         Base32Codec.EncodeToString(freq.Hash[:]),
 873                                 )
 874                                 state.fdsLock.RLock()
 875                                 fdAndFullSize, exists := state.fds[pth]
 876                                 state.fdsLock.RUnlock()
 877                                 if !exists {
 878                                         fd, err := os.Open(pth)
 879                                         if err != nil {
 880                                                 state.Ctx.LogE("sp-queue-open", lesp, err, func(les LEs) string {
 881                                                         return logMsg(les) + ": opening"
 882                                                 })
 883                                                 return
 884                                         }
 885                                         fi, err := fd.Stat()
 886                                         if err != nil {
 887                                                 state.Ctx.LogE("sp-queue-stat", lesp, err, func(les LEs) string {
 888                                                         return logMsg(les) + ": stating"
 889                                                 })
 890                                                 return
 891                                         }
 892                                         fdAndFullSize = FdAndFullSize{fd: fd, fullSize: fi.Size()}
 893                                         state.fdsLock.Lock()
 894                                         state.fds[pth] = fdAndFullSize
 895                                         state.fdsLock.Unlock()
 896                                 }
 897                                 fd := fdAndFullSize.fd
 898                                 fullSize := fdAndFullSize.fullSize
 899                                 var bufRead []byte
 900                                 if freq.Offset < uint64(fullSize) {
 901                                         state.Ctx.LogD("sp-file-seek", lesp, func(les LEs) string {
 902                                                 return logMsg(les) + ": seeking"
 903                                         })
 904                                         if _, err = fd.Seek(int64(freq.Offset), io.SeekStart); err != nil {
 905                                                 state.Ctx.LogE("sp-file-seek", lesp, err, func(les LEs) string {
 906                                                         return logMsg(les) + ": seeking"
 907                                                 })
 908                                                 return
 909                                         }
 910                                         n, err := fd.Read(buf)
 911                                         if err != nil {
 912                                                 state.Ctx.LogE("sp-file-read", lesp, err, func(les LEs) string {
 913                                                         return logMsg(les) + ": reading"
 914                                                 })
 915                                                 return
 916                                         }
 917                                         bufRead = buf[:n]
 918                                         lesp = append(
 919                                                 les,
 920                                                 LE{"XX", string(TTx)},
 921                                                 LE{"Pkt", pktName},
 922                                                 LE{"Size", int64(n)},
 923                                         )
 924                                         state.Ctx.LogD("sp-file-read", lesp, func(les LEs) string {
 925                                                 return fmt.Sprintf(
 926                                                         "%s: read %s",
 927                                                         logMsg(les), humanize.IBytes(uint64(n)),
 928                                                 )
 929                                         })
 930                                 }
 931                                 state.closeFd(pth)
 932                                 payload = MarshalSP(SPTypeFile, SPFile{
 933                                         Hash:    freq.Hash,
 934                                         Offset:  freq.Offset,
 935                                         Payload: bufRead,
 936                                 })
 937                                 ourSize := freq.Offset + uint64(len(bufRead))
 938                                 lesp = append(
 939                                         les,
 940                                         LE{"XX", string(TTx)},
 941                                         LE{"Pkt", pktName},
 942                                         LE{"Size", int64(ourSize)},
 943                                         LE{"FullSize", fullSize},
 944                                 )
 945                                 if state.Ctx.ShowPrgrs {
 946                                         state.progressBars[pktName] = struct{}{}
 947                                         Progress("Tx", lesp)
 948                                 }
 949                                 state.Lock()
 950                                 for i, q := range state.queueTheir {
 951                                         if *q.freq.Hash != *freq.Hash {
 952                                                 continue
 953                                         }
 954                                         if ourSize == uint64(fullSize) {
 955                                                 state.Ctx.LogD("sp-file-finished", lesp, func(les LEs) string {
 956                                                         return logMsg(les) + ": finished"
 957                                                 })
 958                                                 state.queueTheir = append(
 959                                                         state.queueTheir[:i],
 960                                                         state.queueTheir[i+1:]...,
 961                                                 )
 962                                                 if state.Ctx.ShowPrgrs {
 963                                                         delete(state.progressBars, pktName)
 964                                                 }
 965                                         } else {
 966                                                 q.freq.Offset = ourSize
 967                                         }
 968                                         break
 969                                 }
 970                                 state.Unlock()
 971                         }
 972                         logMsg := func(les LEs) string {
 973                                 return fmt.Sprintf(
 974                                         "SP with %s (nice %s): sending %s",
 975                                         state.Node.Name, NicenessFmt(state.Nice),
 976                                         humanize.IBytes(uint64(len(payload))),
 977                                 )
 978                         }
 979                         state.Ctx.LogD("sp-sending", append(les, LE{"Size", int64(len(payload))}), logMsg)
 980                         conn.SetWriteDeadline(time.Now().Add(DefaultDeadline)) // #nosec G104
 981                         ct, err := state.csOur.Encrypt(nil, nil, payload)
 982                         if err != nil {
 983                                 state.Ctx.LogE("sp-encrypting", les, err, logMsg)
 984                                 return
 985                         }
 986                         if err := state.WriteSP(conn, ct, ping); err != nil {
 987                                 state.Ctx.LogE("sp-sending", les, err, logMsg)
 988                                 return
 989                         }
 990                 }
 991         }()
 992
 993         // Receiver
 994         state.wg.Add(1)
 995         go func() {
 996                 for {
 997                         if state.NotAlive() {
 998                                 break
 999                         }
1000                         logMsg := func(les LEs) string {
1001                                 return fmt.Sprintf(
1002                                         "SP with %s (nice %s): waiting for payload",
1003                                         state.Node.Name, NicenessFmt(state.Nice),
1004                                 )
1005                         }
1006                         state.Ctx.LogD("sp-recv-wait", les, logMsg)
1007                         conn.SetReadDeadline(time.Now().Add(DefaultDeadline)) // #nosec G104
1008                         payload, err := state.ReadSP(conn)
1009                         if err != nil {
1010                                 if err == io.EOF {
1011                                         break
1012                                 }
1013                                 unmarshalErr := err.(*xdr.UnmarshalError)
1014                                 if os.IsTimeout(unmarshalErr.Err) {
1015                                         continue
1016                                 }
1017                                 if unmarshalErr.ErrorCode == xdr.ErrIO {
1018                                         break
1019                                 }
1020                                 state.Ctx.LogE("sp-recv-wait", les, err, logMsg)
1021                                 break
1022                         }
1023                         logMsg = func(les LEs) string {
1024                                 return fmt.Sprintf(
1025                                         "SP with %s (nice %s): payload (%s)",
1026                                         state.Node.Name, NicenessFmt(state.Nice),
1027                                         humanize.IBytes(uint64(len(payload))),
1028                                 )
1029                         }
1030                         state.Ctx.LogD(
1031                                 "sp-recv-got",
1032                                 append(les, LE{"Size", int64(len(payload))}),
1033                                 func(les LEs) string { return logMsg(les) + ": got" },
1034                         )
1035                         payload, err = state.csTheir.Decrypt(nil, nil, payload)
1036                         if err != nil {
1037                                 state.Ctx.LogE("sp-recv-got", les, err, func(les LEs) string {
1038                                         return logMsg(les) + ": got"
1039                                 })
1040                                 break
1041                         }
1042                         state.Ctx.LogD(
1043                                 "sp-recv-process",
1044                                 append(les, LE{"Size", int64(len(payload))}),
1045                                 func(les LEs) string {
1046                                         return logMsg(les) + ": processing"
1047                                 },
1048                         )
1049                         replies, err := state.ProcessSP(payload)
1050                         if err != nil {
1051                                 state.Ctx.LogE("sp-recv-process", les, err, func(les LEs) string {
1052                                         return logMsg(les) + ": processing"
1053                                 })
1054                                 break
1055                         }
1056                         state.wg.Add(1)
1057                         go func() {
1058                                 for _, reply := range replies {
1059                                         state.Ctx.LogD(
1060                                                 "sp-recv-reply",
1061                                                 append(les[:len(les)-1], LE{"Size", int64(len(reply))}),
1062                                                 func(les LEs) string {
1063                                                         return fmt.Sprintf(
1064                                                                 "SP with %s (nice %s): queuing reply (%s)",
1065                                                                 state.Node.Name, NicenessFmt(state.Nice),
1066                                                                 humanize.IBytes(uint64(len(reply))),
1067                                                         )
1068                                                 },
1069                                         )
1070                                         state.payloads <- reply
1071                                 }
1072                                 state.wg.Done()
1073                         }()
1074                         if state.rxRate > 0 {
1075                                 time.Sleep(time.Second / time.Duration(state.rxRate))
1076                         }
1077                 }
1078                 state.SetDead()
1079                 state.wg.Done()
1080                 state.SetDead()
1081                 conn.Close() // #nosec G104
1082         }()
1083
1084         return nil
1085 }
1086
1087 func (state *SPState) Wait() {
1088         state.wg.Wait()
1089         close(state.payloads)
1090         close(state.pings)
1091         state.Duration = time.Now().Sub(state.started)
1092         state.dirUnlock()
1093         state.RxSpeed = state.RxBytes
1094         state.TxSpeed = state.TxBytes
1095         rxDuration := int64(state.RxLastSeen.Sub(state.started).Seconds())
1096         txDuration := int64(state.TxLastSeen.Sub(state.started).Seconds())
1097         if rxDuration > 0 {
1098                 state.RxSpeed = state.RxBytes / rxDuration
1099         }
1100         if txDuration > 0 {
1101                 state.TxSpeed = state.TxBytes / txDuration
1102         }
1103         for _, s := range state.fds {
1104                 s.fd.Close()
1105         }
1106         for pktName := range state.progressBars {
1107                 ProgressKill(pktName)
1108         }
1109 }
1110
1111 func (state *SPState) ProcessSP(payload []byte) ([][]byte, error) {
1112         les := LEs{{"Node", state.Node.Id}, {"Nice", int(state.Nice)}}
1113         r := bytes.NewReader(payload)
1114         var err error
1115         var replies [][]byte
1116         var infosGot bool
1117         for r.Len() > 0 {
1118                 state.Ctx.LogD("sp-process-unmarshal", les, func(les LEs) string {
1119                         return fmt.Sprintf(
1120                                 "SP with %s (nice %s): unmarshaling header",
1121                                 state.Node.Name, NicenessFmt(state.Nice),
1122                         )
1123                 })
1124                 var head SPHead
1125                 if _, err = xdr.Unmarshal(r, &head); err != nil {
1126                         state.Ctx.LogE("sp-process-unmarshal", les, err, func(les LEs) string {
1127                                 return fmt.Sprintf(
1128                                         "SP with %s (nice %s): unmarshaling header",
1129                                         state.Node.Name, NicenessFmt(state.Nice),
1130                                 )
1131                         })
1132                         return nil, err
1133                 }
1134                 if head.Type != SPTypePing {
1135                         state.RxLastNonPing = state.RxLastSeen
1136                 }
1137                 switch head.Type {
1138                 case SPTypeHalt:
1139                         state.Ctx.LogD(
1140                                 "sp-process-halt",
1141                                 append(les, LE{"Type", "halt"}), func(les LEs) string {
1142                                         return fmt.Sprintf(
1143                                                 "SP with %s (nice %s): got HALT",
1144                                                 state.Node.Name, NicenessFmt(state.Nice),
1145                                         )
1146                                 },
1147                         )
1148                         state.Lock()
1149                         state.queueTheir = nil
1150                         state.Unlock()
1151
1152                 case SPTypePing:
1153                         state.Ctx.LogD(
1154                                 "sp-process-ping",
1155                                 append(les, LE{"Type", "ping"}),
1156                                 func(les LEs) string {
1157                                         return fmt.Sprintf(
1158                                                 "SP with %s (nice %s): got PING",
1159                                                 state.Node.Name, NicenessFmt(state.Nice),
1160                                         )
1161                                 },
1162                         )
1163
1164                 case SPTypeInfo:
1165                         infosGot = true
1166                         lesp := append(les, LE{"Type", "info"})
1167                         state.Ctx.LogD(
1168                                 "sp-process-info-unmarshal", lesp,
1169                                 func(les LEs) string {
1170                                         return fmt.Sprintf(
1171                                                 "SP with %s (nice %s): unmarshaling INFO",
1172                                                 state.Node.Name, NicenessFmt(state.Nice),
1173                                         )
1174                                 },
1175                         )
1176                         var info SPInfo
1177                         if _, err = xdr.Unmarshal(r, &info); err != nil {
1178                                 state.Ctx.LogE(
1179                                         "sp-process-info-unmarshal", lesp, err,
1180                                         func(les LEs) string {
1181                                                 return fmt.Sprintf(
1182                                                         "SP with %s (nice %s): unmarshaling INFO",
1183                                                         state.Node.Name, NicenessFmt(state.Nice),
1184                                                 )
1185                                         },
1186                                 )
1187                                 return nil, err
1188                         }
1189                         pktName := Base32Codec.EncodeToString(info.Hash[:])
1190                         lesp = append(
1191                                 lesp,
1192                                 LE{"Pkt", pktName},
1193                                 LE{"Size", int64(info.Size)},
1194                                 LE{"PktNice", int(info.Nice)},
1195                         )
1196                         logMsg := func(les LEs) string {
1197                                 return fmt.Sprintf(
1198                                         "SP with %s (nice %s): INFO %s (%s) nice %s",
1199                                         state.Node.Name, NicenessFmt(state.Nice),
1200                                         pktName,
1201                                         humanize.IBytes(info.Size),
1202                                         NicenessFmt(info.Nice),
1203                                 )
1204                         }
1205                         if !state.listOnly && info.Nice > state.Nice {
1206                                 state.Ctx.LogD("sp-process-info-too-nice", lesp, func(les LEs) string {
1207                                         return logMsg(les) + ": too nice"
1208                                 })
1209                                 continue
1210                         }
1211                         state.Ctx.LogD("sp-process-info-got", lesp, func(les LEs) string {
1212                                 return logMsg(les) + ": received"
1213                         })
1214                         if !state.listOnly && state.xxOnly == TTx {
1215                                 continue
1216                         }
1217                         state.Lock()
1218                         state.infosTheir[*info.Hash] = &info
1219                         state.Unlock()
1220                         state.Ctx.LogD("sp-process-info-stat", lesp, func(les LEs) string {
1221                                 return logMsg(les) + ": stating part"
1222                         })
1223                         pktPath := filepath.Join(
1224                                 state.Ctx.Spool,
1225                                 state.Node.Id.String(),
1226                                 string(TRx),
1227                                 Base32Codec.EncodeToString(info.Hash[:]),
1228                         )
1229                         logMsg = func(les LEs) string {
1230                                 return fmt.Sprintf(
1231                                         "Packet %s (%s) (nice %s)",
1232                                         pktName,
1233                                         humanize.IBytes(info.Size),
1234                                         NicenessFmt(info.Nice),
1235                                 )
1236                         }
1237                         if _, err = os.Stat(pktPath); err == nil {
1238                                 state.Ctx.LogI("sp-info-done", lesp, func(les LEs) string {
1239                                         return logMsg(les) + ": already done"
1240                                 })
1241                                 if !state.listOnly {
1242                                         replies = append(replies, MarshalSP(SPTypeDone, SPDone{info.Hash}))
1243                                 }
1244                                 continue
1245                         }
1246                         if _, err = os.Stat(pktPath + SeenSuffix); err == nil {
1247                                 state.Ctx.LogI("sp-info-seen", lesp, func(les LEs) string {
1248                                         return logMsg(les) + ": already seen"
1249                                 })
1250                                 if !state.listOnly {
1251                                         replies = append(replies, MarshalSP(SPTypeDone, SPDone{info.Hash}))
1252                                 }
1253                                 continue
1254                         }
1255                         if _, err = os.Stat(pktPath + NoCKSuffix); err == nil {
1256                                 state.Ctx.LogI("sp-info-nock", lesp, func(les LEs) string {
1257                                         return logMsg(les) + ": still not checksummed"
1258                                 })
1259                                 continue
1260                         }
1261                         fi, err := os.Stat(pktPath + PartSuffix)
1262                         var offset int64
1263                         if err == nil {
1264                                 offset = fi.Size()
1265                         }
1266                         if !state.Ctx.IsEnoughSpace(int64(info.Size) - offset) {
1267                                 state.Ctx.LogI("sp-info-no-space", lesp, func(les LEs) string {
1268                                         return logMsg(les) + ": not enough space"
1269                                 })
1270                                 continue
1271                         }
1272                         state.Ctx.LogI(
1273                                 "sp-info",
1274                                 append(lesp, LE{"Offset", offset}),
1275                                 func(les LEs) string {
1276                                         return fmt.Sprintf(
1277                                                 "%s: %d%%", logMsg(les), 100*uint64(offset)/info.Size,
1278                                         )
1279                                 },
1280                         )
1281                         if !state.listOnly && (state.onlyPkts == nil || state.onlyPkts[*info.Hash]) {
1282                                 replies = append(replies, MarshalSP(
1283                                         SPTypeFreq,
1284                                         SPFreq{info.Hash, uint64(offset)},
1285                                 ))
1286                         }
1287
1288                 case SPTypeFile:
1289                         lesp := append(les, LE{"Type", "file"})
1290                         state.Ctx.LogD("sp-process-file", lesp, func(les LEs) string {
1291                                 return fmt.Sprintf(
1292                                         "SP with %s (nice %s): unmarshaling FILE",
1293                                         state.Node.Name, NicenessFmt(state.Nice),
1294                                 )
1295                         })
1296                         var file SPFile
1297                         if _, err = xdr.Unmarshal(r, &file); err != nil {
1298                                 state.Ctx.LogE("sp-process-file", lesp, err, func(les LEs) string {
1299                                         return fmt.Sprintf(
1300                                                 "SP with %s (nice %s): unmarshaling FILE",
1301                                                 state.Node.Name, NicenessFmt(state.Nice),
1302                                         )
1303                                 })
1304                                 return nil, err
1305                         }
1306                         pktName := Base32Codec.EncodeToString(file.Hash[:])
1307                         lesp = append(
1308                                 lesp,
1309                                 LE{"XX", string(TRx)},
1310                                 LE{"Pkt", pktName},
1311                                 LE{"Size", int64(len(file.Payload))},
1312                         )
1313                         logMsg := func(les LEs) string {
1314                                 return fmt.Sprintf(
1315                                         "Got packet %s (%s)",
1316                                         pktName, humanize.IBytes(uint64(len(file.Payload))),
1317                                 )
1318                         }
1319                         fullsize := int64(0)
1320                         state.RLock()
1321                         infoTheir, ok := state.infosTheir[*file.Hash]
1322                         state.RUnlock()
1323                         if !ok {
1324                                 state.Ctx.LogE("sp-file-open", lesp, err, func(les LEs) string {
1325                                         return logMsg(les) + ": unknown file"
1326                                 })
1327                                 continue
1328                         }
1329                         fullsize = int64(infoTheir.Size)
1330                         lesp = append(lesp, LE{"FullSize", fullsize})
1331                         dirToSync := filepath.Join(
1332                                 state.Ctx.Spool,
1333                                 state.Node.Id.String(),
1334                                 string(TRx),
1335                         )
1336                         filePath := filepath.Join(dirToSync, pktName)
1337                         filePathPart := filePath + PartSuffix
1338                         state.Ctx.LogD("sp-file-open", lesp, func(les LEs) string {
1339                                 return logMsg(les) + ": opening part"
1340                         })
1341                         state.fdsLock.RLock()
1342                         fdAndFullSize, exists := state.fds[filePathPart]
1343                         state.fdsLock.RUnlock()
1344                         hasherAndOffset := state.fileHashers[filePath]
1345                         var fd *os.File
1346                         if exists {
1347                                 fd = fdAndFullSize.fd
1348                         } else {
1349                                 fd, err = os.OpenFile(
1350                                         filePathPart,
1351                                         os.O_RDWR|os.O_CREATE,
1352                                         os.FileMode(0666),
1353                                 )
1354                                 if err != nil {
1355                                         state.Ctx.LogE("sp-file-open", lesp, err, func(les LEs) string {
1356                                                 return logMsg(les) + ": opening part"
1357                                         })
1358                                         return nil, err
1359                                 }
1360                                 state.fdsLock.Lock()
1361                                 state.fds[filePathPart] = FdAndFullSize{fd: fd}
1362                                 state.fdsLock.Unlock()
1363                                 if !state.NoCK {
1364                                         hasherAndOffset = &MTHAndOffset{
1365                                                 mth:    MTHNew(fullsize, int64(file.Offset)),
1366                                                 offset: file.Offset,
1367                                         }
1368                                         state.fileHashers[filePath] = hasherAndOffset
1369                                 }
1370                         }
1371                         state.Ctx.LogD(
1372                                 "sp-file-seek",
1373                                 append(lesp, LE{"Offset", file.Offset}),
1374                                 func(les LEs) string {
1375                                         return fmt.Sprintf("%s: seeking %d", logMsg(les), file.Offset)
1376                                 })
1377                         if _, err = fd.Seek(int64(file.Offset), io.SeekStart); err != nil {
1378                                 state.Ctx.LogE("sp-file-seek", lesp, err, func(les LEs) string {
1379                                         return logMsg(les) + ": seeking"
1380                                 })
1381                                 state.closeFd(filePathPart)
1382                                 return nil, err
1383                         }
1384                         state.Ctx.LogD("sp-file-write", lesp, func(les LEs) string {
1385                                 return logMsg(les) + ": writing"
1386                         })
1387                         if _, err = fd.Write(file.Payload); err != nil {
1388                                 state.Ctx.LogE("sp-file-write", lesp, err, func(les LEs) string {
1389                                         return logMsg(les) + ": writing"
1390                                 })
1391                                 state.closeFd(filePathPart)
1392                                 return nil, err
1393                         }
1394                         if hasherAndOffset != nil {
1395                                 if hasherAndOffset.offset == file.Offset {
1396                                         if _, err = hasherAndOffset.mth.Write(file.Payload); err != nil {
1397                                                 panic(err)
1398                                         }
1399                                         hasherAndOffset.offset += uint64(len(file.Payload))
1400                                 } else {
1401                                         state.Ctx.LogE(
1402                                                 "sp-file-offset-differs", lesp, errors.New("offset differs"),
1403                                                 func(les LEs) string {
1404                                                         return logMsg(les) + ": deleting hasher"
1405                                                 },
1406                                         )
1407                                         delete(state.fileHashers, filePath)
1408                                         hasherAndOffset = nil
1409                                 }
1410                         }
1411                         ourSize := int64(file.Offset + uint64(len(file.Payload)))
1412                         lesp[len(lesp)-2].V = ourSize
1413                         if state.Ctx.ShowPrgrs {
1414                                 state.progressBars[pktName] = struct{}{}
1415                                 Progress("Rx", lesp)
1416                         }
1417                         if fullsize != ourSize {
1418                                 continue
1419                         }
1420                         if state.Ctx.ShowPrgrs {
1421                                 delete(state.progressBars, pktName)
1422                         }
1423                         logMsg = func(les LEs) string {
1424                                 return fmt.Sprintf(
1425                                         "Got packet %s %d%% (%s / %s)",
1426                                         pktName, 100*ourSize/fullsize,
1427                                         humanize.IBytes(uint64(ourSize)),
1428                                         humanize.IBytes(uint64(fullsize)),
1429                                 )
1430                         }
1431                         err = fd.Sync()
1432                         if err != nil {
1433                                 state.Ctx.LogE("sp-file-sync", lesp, err, func(les LEs) string {
1434                                         return logMsg(les) + ": syncing"
1435                                 })
1436                                 state.closeFd(filePathPart)
1437                                 continue
1438                         }
1439                         if hasherAndOffset != nil {
1440                                 delete(state.fileHashers, filePath)
1441                                 if hasherAndOffset.mth.PrependSize() == 0 {
1442                                         if bytes.Compare(hasherAndOffset.mth.Sum(nil), file.Hash[:]) != 0 {
1443                                                 state.Ctx.LogE(
1444                                                         "sp-file-bad-checksum", lesp,
1445                                                         errors.New("checksum mismatch"),
1446                                                         logMsg,
1447                                                 )
1448                                                 state.closeFd(filePathPart)
1449                                                 continue
1450                                         }
1451                                         if err = os.Rename(filePathPart, filePath); err != nil {
1452                                                 state.Ctx.LogE("sp-file-rename", lesp, err, func(les LEs) string {
1453                                                         return logMsg(les) + ": renaming"
1454                                                 })
1455                                                 state.closeFd(filePathPart)
1456                                                 continue
1457                                         }
1458                                         if err = DirSync(dirToSync); err != nil {
1459                                                 state.Ctx.LogE("sp-file-dirsync", lesp, err, func(les LEs) string {
1460                                                         return logMsg(les) + ": dirsyncing"
1461                                                 })
1462                                                 state.closeFd(filePathPart)
1463                                                 continue
1464                                         }
1465                                         state.Ctx.LogI("sp-file-done", lesp, func(les LEs) string {
1466                                                 return logMsg(les) + ": done"
1467                                         })
1468                                         state.wg.Add(1)
1469                                         go func() {
1470                                                 state.payloads <- MarshalSP(SPTypeDone, SPDone{file.Hash})
1471                                                 state.wg.Done()
1472                                         }()
1473                                         state.Lock()
1474                                         delete(state.infosTheir, *file.Hash)
1475                                         state.Unlock()
1476                                         if !state.Ctx.HdrUsage {
1477                                                 continue
1478                                         }
1479                                         if _, err = fd.Seek(0, io.SeekStart); err != nil {
1480                                                 state.Ctx.LogE("sp-file-seek", lesp, err, func(les LEs) string {
1481                                                         return logMsg(les) + ": seeking"
1482                                                 })
1483                                                 state.closeFd(filePathPart)
1484                                                 continue
1485                                         }
1486                                         _, pktEncRaw, err := state.Ctx.HdrRead(fd)
1487                                         state.closeFd(filePathPart)
1488                                         if err != nil {
1489                                                 state.Ctx.LogE("sp-file-hdr-read", lesp, err, func(les LEs) string {
1490                                                         return logMsg(les) + ": HdrReading"
1491                                                 })
1492                                                 continue
1493                                         }
1494                                         state.Ctx.HdrWrite(pktEncRaw, filePath)
1495                                         continue
1496                                 }
1497                         }
1498                         state.closeFd(filePathPart)
1499                         if err = os.Rename(filePathPart, filePath+NoCKSuffix); err != nil {
1500                                 state.Ctx.LogE("sp-file-rename", lesp, err, func(les LEs) string {
1501                                         return logMsg(les) + ": renaming"
1502                                 })
1503                                 continue
1504                         }
1505                         if err = DirSync(dirToSync); err != nil {
1506                                 state.Ctx.LogE("sp-file-dirsync", lesp, err, func(les LEs) string {
1507                                         return logMsg(les) + ": dirsyncing"
1508                                 })
1509                                 continue
1510                         }
1511                         state.Ctx.LogI("sp-file-downloaded", lesp, func(les LEs) string {
1512                                 return logMsg(les) + ": downloaded"
1513                         })
1514                         state.Lock()
1515                         delete(state.infosTheir, *file.Hash)
1516                         state.Unlock()
1517                         go func() {
1518                                 t := SPCheckerTask{
1519                                         nodeId: state.Node.Id,
1520                                         hsh:    file.Hash,
1521                                         done:   state.payloads,
1522                                 }
1523                                 if hasherAndOffset != nil {
1524                                         t.mth = hasherAndOffset.mth
1525                                 }
1526                                 spCheckerTasks <- t
1527                         }()
1528
1529                 case SPTypeDone:
1530                         lesp := append(les, LE{"Type", "done"})
1531                         state.Ctx.LogD("sp-process-done-unmarshal", lesp, func(les LEs) string {
1532                                 return fmt.Sprintf(
1533                                         "SP with %s (nice %s): unmarshaling DONE",
1534                                         state.Node.Name, NicenessFmt(state.Nice),
1535                                 )
1536                         })
1537                         var done SPDone
1538                         if _, err = xdr.Unmarshal(r, &done); err != nil {
1539                                 state.Ctx.LogE("sp-process-done-unmarshal", lesp, err, func(les LEs) string {
1540                                         return fmt.Sprintf(
1541                                                 "SP with %s (nice %s): unmarshaling DONE",
1542                                                 state.Node.Name, NicenessFmt(state.Nice),
1543                                         )
1544                                 })
1545                                 return nil, err
1546                         }
1547                         pktName := Base32Codec.EncodeToString(done.Hash[:])
1548                         lesp = append(lesp, LE{"Pkt", pktName}, LE{"XX", string(TTx)})
1549                         logMsg := func(les LEs) string {
1550                                 return fmt.Sprintf(
1551                                         "SP with %s (nice %s): DONE: removing %s",
1552                                         state.Node.Name, NicenessFmt(state.Nice), pktName,
1553                                 )
1554                         }
1555                         state.Ctx.LogD("sp-done", lesp, logMsg)
1556                         pth := filepath.Join(
1557                                 state.Ctx.Spool,
1558                                 state.Node.Id.String(),
1559                                 string(TTx),
1560                                 pktName,
1561                         )
1562                         if err = os.Remove(pth); err == nil {
1563                                 state.Ctx.LogI("sp-done", lesp, func(les LEs) string {
1564                                         return fmt.Sprintf("Packet %s is sent", pktName)
1565                                 })
1566                                 if state.Ctx.HdrUsage {
1567                                         os.Remove(pth + HdrSuffix)
1568                                 }
1569                         } else {
1570                                 state.Ctx.LogE("sp-done", lesp, err, logMsg)
1571                         }
1572
1573                 case SPTypeFreq:
1574                         lesp := append(les, LE{"Type", "freq"})
1575                         state.Ctx.LogD("sp-process-freq", lesp, func(les LEs) string {
1576                                 return fmt.Sprintf(
1577                                         "SP with %s (nice %s): unmarshaling FREQ",
1578                                         state.Node.Name, NicenessFmt(state.Nice),
1579                                 )
1580                         })
1581                         var freq SPFreq
1582                         if _, err = xdr.Unmarshal(r, &freq); err != nil {
1583                                 state.Ctx.LogE("sp-process-freq", lesp, err, func(les LEs) string {
1584                                         return fmt.Sprintf(
1585                                                 "SP with %s (nice %s): unmarshaling FREQ",
1586                                                 state.Node.Name, NicenessFmt(state.Nice),
1587                                         )
1588                                 })
1589                                 return nil, err
1590                         }
1591                         pktName := Base32Codec.EncodeToString(freq.Hash[:])
1592                         lesp = append(lesp, LE{"Pkt", pktName}, LE{"Offset", freq.Offset})
1593                         state.Ctx.LogD("sp-process-freq-queueing", lesp, func(les LEs) string {
1594                                 return fmt.Sprintf(
1595                                         "SP with %s (nice %s): FREQ %s: queuing",
1596                                         state.Node.Name, NicenessFmt(state.Nice), pktName,
1597                                 )
1598                         })
1599                         nice, exists := state.infosOurSeen[*freq.Hash]
1600                         if exists {
1601                                 if state.onlyPkts == nil || !state.onlyPkts[*freq.Hash] {
1602                                         state.Lock()
1603                                         insertIdx := 0
1604                                         var freqWithNice *FreqWithNice
1605                                         for insertIdx, freqWithNice = range state.queueTheir {
1606                                                 if freqWithNice.nice > nice {
1607                                                         break
1608                                                 }
1609                                         }
1610                                         state.queueTheir = append(state.queueTheir, nil)
1611                                         copy(state.queueTheir[insertIdx+1:], state.queueTheir[insertIdx:])
1612                                         state.queueTheir[insertIdx] = &FreqWithNice{&freq, nice}
1613                                         state.Unlock()
1614                                 } else {
1615                                         state.Ctx.LogD("sp-process-freq-skip", lesp, func(les LEs) string {
1616                                                 return fmt.Sprintf(
1617                                                         "SP with %s (nice %s): FREQ %s: skipping",
1618                                                         state.Node.Name, NicenessFmt(state.Nice), pktName,
1619                                                 )
1620                                         })
1621                                 }
1622                         } else {
1623                                 state.Ctx.LogD("sp-process-freq-unknown", lesp, func(les LEs) string {
1624                                         return fmt.Sprintf(
1625                                                 "SP with %s (nice %s): FREQ %s: unknown",
1626                                                 state.Node.Name, NicenessFmt(state.Nice), pktName,
1627                                         )
1628                                 })
1629                         }
1630
1631                 default:
1632                         state.Ctx.LogE(
1633                                 "sp-process-type-unknown",
1634                                 append(les, LE{"Type", head.Type}),
1635                                 errors.New("unknown type"),
1636                                 func(les LEs) string {
1637                                         return fmt.Sprintf(
1638                                                 "SP with %s (nice %s): %d",
1639                                                 state.Node.Name, NicenessFmt(state.Nice), head.Type,
1640                                         )
1641                                 },
1642                         )
1643                         return nil, BadPktType
1644                 }
1645         }
1646
1647         if infosGot {
1648                 var pkts int
1649                 var size uint64
1650                 state.RLock()
1651                 for _, info := range state.infosTheir {
1652                         pkts++
1653                         size += info.Size
1654                 }
1655                 state.RUnlock()
1656                 state.Ctx.LogI("sp-infos-rx", LEs{
1657                         {"XX", string(TRx)},
1658                         {"Node", state.Node.Id},
1659                         {"Pkts", pkts},
1660                         {"Size", int64(size)},
1661                 }, func(les LEs) string {
1662                         return fmt.Sprintf(
1663                                 "%s has got for us: %d packets, %s",
1664                                 state.Node.Name, pkts, humanize.IBytes(size),
1665                         )
1666                 })
1667         }
1668         return payloadsSplit(replies), nil
1669 }
1670
1671 func SPChecker(ctx *Ctx) {
1672         for t := range spCheckerTasks {
1673                 pktName := Base32Codec.EncodeToString(t.hsh[:])
1674                 les := LEs{
1675                         {"XX", string(TRx)},
1676                         {"Node", t.nodeId},
1677                         {"Pkt", pktName},
1678                 }
1679                 SPCheckerWg.Add(1)
1680                 ctx.LogD("sp-checker", les, func(les LEs) string {
1681                         return fmt.Sprintf("Checksumming %s/rx/%s", ctx.NodeName(t.nodeId), pktName)
1682                 })
1683                 size, err := ctx.CheckNoCK(t.nodeId, t.hsh, t.mth)
1684                 les = append(les, LE{"Size", size})
1685                 if err != nil {
1686                         ctx.LogE("sp-checker", les, err, func(les LEs) string {
1687                                 return fmt.Sprintf(
1688                                         "Checksumming %s/rx/%s (%s)", ctx.NodeName(t.nodeId), pktName,
1689                                         humanize.IBytes(uint64(size)),
1690                                 )
1691                         })
1692                         SPCheckerWg.Done()
1693                         continue
1694                 }
1695                 ctx.LogI("sp-checker-done", les, func(les LEs) string {
1696                         return fmt.Sprintf(
1697                                 "Packet %s is retreived (%s)",
1698                                 pktName, humanize.IBytes(uint64(size)),
1699                         )
1700                 })
1701                 SPCheckerWg.Done()
1702                 go func(t SPCheckerTask) {
1703                         defer func() { recover() }()
1704                         t.done <- MarshalSP(SPTypeDone, SPDone{t.hsh})
1705                 }(t)
1706         }
1707 }