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                                         state.Ctx.LogD("sp-queue-open", lesp, func(les LEs) string {
 879                                                 return logMsg(les) + ": opening"
 880                                         })
 881                                         fd, err := os.Open(pth)
 882                                         if err != nil {
 883                                                 state.Ctx.LogE("sp-queue-open", lesp, err, func(les LEs) string {
 884                                                         return logMsg(les) + ": opening"
 885                                                 })
 886                                                 return
 887                                         }
 888                                         fi, err := fd.Stat()
 889                                         if err != nil {
 890                                                 state.Ctx.LogE("sp-queue-stat", lesp, err, func(les LEs) string {
 891                                                         return logMsg(les) + ": stating"
 892                                                 })
 893                                                 return
 894                                         }
 895                                         fdAndFullSize = FdAndFullSize{fd: fd, fullSize: fi.Size()}
 896                                         state.fdsLock.Lock()
 897                                         state.fds[pth] = fdAndFullSize
 898                                         state.fdsLock.Unlock()
 899                                 }
 900                                 fd := fdAndFullSize.fd
 901                                 fullSize := fdAndFullSize.fullSize
 902                                 lesp = append(lesp, LE{"FullSize", fullSize})
 903                                 var bufRead []byte
 904                                 if freq.Offset < uint64(fullSize) {
 905                                         state.Ctx.LogD("sp-file-seek", lesp, func(les LEs) string {
 906                                                 return logMsg(les) + ": seeking"
 907                                         })
 908                                         if _, err = fd.Seek(int64(freq.Offset), io.SeekStart); err != nil {
 909                                                 state.Ctx.LogE("sp-file-seek", lesp, err, func(les LEs) string {
 910                                                         return logMsg(les) + ": seeking"
 911                                                 })
 912                                                 return
 913                                         }
 914                                         n, err := fd.Read(buf)
 915                                         if err != nil {
 916                                                 state.Ctx.LogE("sp-file-read", lesp, err, func(les LEs) string {
 917                                                         return logMsg(les) + ": reading"
 918                                                 })
 919                                                 return
 920                                         }
 921                                         bufRead = buf[:n]
 922                                         lesp = append(
 923                                                 les,
 924                                                 LE{"XX", string(TTx)},
 925                                                 LE{"Pkt", pktName},
 926                                                 LE{"Size", int64(n)},
 927                                                 LE{"FullSize", fullSize},
 928                                         )
 929                                         state.Ctx.LogD("sp-file-read", lesp, func(les LEs) string {
 930                                                 return fmt.Sprintf(
 931                                                         "%s: read %s",
 932                                                         logMsg(les), humanize.IBytes(uint64(n)),
 933                                                 )
 934                                         })
 935                                 }
 936                                 state.closeFd(pth)
 937                                 payload = MarshalSP(SPTypeFile, SPFile{
 938                                         Hash:    freq.Hash,
 939                                         Offset:  freq.Offset,
 940                                         Payload: bufRead,
 941                                 })
 942                                 ourSize := freq.Offset + uint64(len(bufRead))
 943                                 lesp = append(
 944                                         les,
 945                                         LE{"XX", string(TTx)},
 946                                         LE{"Pkt", pktName},
 947                                         LE{"Size", int64(ourSize)},
 948                                         LE{"FullSize", fullSize},
 949                                 )
 950                                 if state.Ctx.ShowPrgrs {
 951                                         state.progressBars[pktName] = struct{}{}
 952                                         Progress("Tx", lesp)
 953                                 }
 954                                 state.Lock()
 955                                 for i, q := range state.queueTheir {
 956                                         if *q.freq.Hash != *freq.Hash {
 957                                                 continue
 958                                         }
 959                                         if ourSize == uint64(fullSize) {
 960                                                 state.Ctx.LogD("sp-file-finished", lesp, func(les LEs) string {
 961                                                         return logMsg(les) + ": finished"
 962                                                 })
 963                                                 state.queueTheir = append(
 964                                                         state.queueTheir[:i],
 965                                                         state.queueTheir[i+1:]...,
 966                                                 )
 967                                                 if state.Ctx.ShowPrgrs {
 968                                                         delete(state.progressBars, pktName)
 969                                                 }
 970                                         } else {
 971                                                 q.freq.Offset = ourSize
 972                                         }
 973                                         break
 974                                 }
 975                                 state.Unlock()
 976                         }
 977                         logMsg := func(les LEs) string {
 978                                 return fmt.Sprintf(
 979                                         "SP with %s (nice %s): sending %s",
 980                                         state.Node.Name, NicenessFmt(state.Nice),
 981                                         humanize.IBytes(uint64(len(payload))),
 982                                 )
 983                         }
 984                         state.Ctx.LogD("sp-sending", append(les, LE{"Size", int64(len(payload))}), logMsg)
 985                         conn.SetWriteDeadline(time.Now().Add(DefaultDeadline)) // #nosec G104
 986                         ct, err := state.csOur.Encrypt(nil, nil, payload)
 987                         if err != nil {
 988                                 state.Ctx.LogE("sp-encrypting", les, err, logMsg)
 989                                 return
 990                         }
 991                         if err := state.WriteSP(conn, ct, ping); err != nil {
 992                                 state.Ctx.LogE("sp-sending", les, err, logMsg)
 993                                 return
 994                         }
 995                 }
 996         }()
 997
 998         // Receiver
 999         state.wg.Add(1)
1000         go func() {
1001                 for {
1002                         if state.NotAlive() {
1003                                 break
1004                         }
1005                         logMsg := func(les LEs) string {
1006                                 return fmt.Sprintf(
1007                                         "SP with %s (nice %s): waiting for payload",
1008                                         state.Node.Name, NicenessFmt(state.Nice),
1009                                 )
1010                         }
1011                         state.Ctx.LogD("sp-recv-wait", les, logMsg)
1012                         conn.SetReadDeadline(time.Now().Add(DefaultDeadline)) // #nosec G104
1013                         payload, err := state.ReadSP(conn)
1014                         if err != nil {
1015                                 if err == io.EOF {
1016                                         break
1017                                 }
1018                                 unmarshalErr := err.(*xdr.UnmarshalError)
1019                                 if os.IsTimeout(unmarshalErr.Err) {
1020                                         continue
1021                                 }
1022                                 if unmarshalErr.ErrorCode == xdr.ErrIO {
1023                                         break
1024                                 }
1025                                 state.Ctx.LogE("sp-recv-wait", les, err, logMsg)
1026                                 break
1027                         }
1028                         logMsg = func(les LEs) string {
1029                                 return fmt.Sprintf(
1030                                         "SP with %s (nice %s): payload (%s)",
1031                                         state.Node.Name, NicenessFmt(state.Nice),
1032                                         humanize.IBytes(uint64(len(payload))),
1033                                 )
1034                         }
1035                         state.Ctx.LogD(
1036                                 "sp-recv-got",
1037                                 append(les, LE{"Size", int64(len(payload))}),
1038                                 func(les LEs) string { return logMsg(les) + ": got" },
1039                         )
1040                         payload, err = state.csTheir.Decrypt(nil, nil, payload)
1041                         if err != nil {
1042                                 state.Ctx.LogE("sp-recv-got", les, err, func(les LEs) string {
1043                                         return logMsg(les) + ": got"
1044                                 })
1045                                 break
1046                         }
1047                         state.Ctx.LogD(
1048                                 "sp-recv-process",
1049                                 append(les, LE{"Size", int64(len(payload))}),
1050                                 func(les LEs) string {
1051                                         return logMsg(les) + ": processing"
1052                                 },
1053                         )
1054                         replies, err := state.ProcessSP(payload)
1055                         if err != nil {
1056                                 state.Ctx.LogE("sp-recv-process", les, err, func(les LEs) string {
1057                                         return logMsg(les) + ": processing"
1058                                 })
1059                                 break
1060                         }
1061                         state.wg.Add(1)
1062                         go func() {
1063                                 for _, reply := range replies {
1064                                         state.Ctx.LogD(
1065                                                 "sp-recv-reply",
1066                                                 append(les[:len(les)-1], LE{"Size", int64(len(reply))}),
1067                                                 func(les LEs) string {
1068                                                         return fmt.Sprintf(
1069                                                                 "SP with %s (nice %s): queuing reply (%s)",
1070                                                                 state.Node.Name, NicenessFmt(state.Nice),
1071                                                                 humanize.IBytes(uint64(len(reply))),
1072                                                         )
1073                                                 },
1074                                         )
1075                                         state.payloads <- reply
1076                                 }
1077                                 state.wg.Done()
1078                         }()
1079                         if state.rxRate > 0 {
1080                                 time.Sleep(time.Second / time.Duration(state.rxRate))
1081                         }
1082                 }
1083                 state.SetDead()
1084                 state.wg.Done()
1085                 state.SetDead()
1086                 conn.Close() // #nosec G104
1087         }()
1088
1089         return nil
1090 }
1091
1092 func (state *SPState) Wait() {
1093         state.wg.Wait()
1094         close(state.payloads)
1095         close(state.pings)
1096         state.Duration = time.Now().Sub(state.started)
1097         state.dirUnlock()
1098         state.RxSpeed = state.RxBytes
1099         state.TxSpeed = state.TxBytes
1100         rxDuration := int64(state.RxLastSeen.Sub(state.started).Seconds())
1101         txDuration := int64(state.TxLastSeen.Sub(state.started).Seconds())
1102         if rxDuration > 0 {
1103                 state.RxSpeed = state.RxBytes / rxDuration
1104         }
1105         if txDuration > 0 {
1106                 state.TxSpeed = state.TxBytes / txDuration
1107         }
1108         for _, s := range state.fds {
1109                 s.fd.Close()
1110         }
1111         for pktName := range state.progressBars {
1112                 ProgressKill(pktName)
1113         }
1114 }
1115
1116 func (state *SPState) ProcessSP(payload []byte) ([][]byte, error) {
1117         les := LEs{{"Node", state.Node.Id}, {"Nice", int(state.Nice)}}
1118         r := bytes.NewReader(payload)
1119         var err error
1120         var replies [][]byte
1121         var infosGot bool
1122         for r.Len() > 0 {
1123                 state.Ctx.LogD("sp-process-unmarshal", les, func(les LEs) string {
1124                         return fmt.Sprintf(
1125                                 "SP with %s (nice %s): unmarshaling header",
1126                                 state.Node.Name, NicenessFmt(state.Nice),
1127                         )
1128                 })
1129                 var head SPHead
1130                 if _, err = xdr.Unmarshal(r, &head); err != nil {
1131                         state.Ctx.LogE("sp-process-unmarshal", les, err, func(les LEs) string {
1132                                 return fmt.Sprintf(
1133                                         "SP with %s (nice %s): unmarshaling header",
1134                                         state.Node.Name, NicenessFmt(state.Nice),
1135                                 )
1136                         })
1137                         return nil, err
1138                 }
1139                 if head.Type != SPTypePing {
1140                         state.RxLastNonPing = state.RxLastSeen
1141                 }
1142                 switch head.Type {
1143                 case SPTypeHalt:
1144                         state.Ctx.LogD(
1145                                 "sp-process-halt",
1146                                 append(les, LE{"Type", "halt"}), func(les LEs) string {
1147                                         return fmt.Sprintf(
1148                                                 "SP with %s (nice %s): got HALT",
1149                                                 state.Node.Name, NicenessFmt(state.Nice),
1150                                         )
1151                                 },
1152                         )
1153                         state.Lock()
1154                         state.queueTheir = nil
1155                         state.Unlock()
1156
1157                 case SPTypePing:
1158                         state.Ctx.LogD(
1159                                 "sp-process-ping",
1160                                 append(les, LE{"Type", "ping"}),
1161                                 func(les LEs) string {
1162                                         return fmt.Sprintf(
1163                                                 "SP with %s (nice %s): got PING",
1164                                                 state.Node.Name, NicenessFmt(state.Nice),
1165                                         )
1166                                 },
1167                         )
1168
1169                 case SPTypeInfo:
1170                         infosGot = true
1171                         lesp := append(les, LE{"Type", "info"})
1172                         state.Ctx.LogD(
1173                                 "sp-process-info-unmarshal", lesp,
1174                                 func(les LEs) string {
1175                                         return fmt.Sprintf(
1176                                                 "SP with %s (nice %s): unmarshaling INFO",
1177                                                 state.Node.Name, NicenessFmt(state.Nice),
1178                                         )
1179                                 },
1180                         )
1181                         var info SPInfo
1182                         if _, err = xdr.Unmarshal(r, &info); err != nil {
1183                                 state.Ctx.LogE(
1184                                         "sp-process-info-unmarshal", lesp, err,
1185                                         func(les LEs) string {
1186                                                 return fmt.Sprintf(
1187                                                         "SP with %s (nice %s): unmarshaling INFO",
1188                                                         state.Node.Name, NicenessFmt(state.Nice),
1189                                                 )
1190                                         },
1191                                 )
1192                                 return nil, err
1193                         }
1194                         pktName := Base32Codec.EncodeToString(info.Hash[:])
1195                         lesp = append(
1196                                 lesp,
1197                                 LE{"Pkt", pktName},
1198                                 LE{"Size", int64(info.Size)},
1199                                 LE{"PktNice", int(info.Nice)},
1200                         )
1201                         logMsg := func(les LEs) string {
1202                                 return fmt.Sprintf(
1203                                         "SP with %s (nice %s): INFO %s (%s) nice %s",
1204                                         state.Node.Name, NicenessFmt(state.Nice),
1205                                         pktName,
1206                                         humanize.IBytes(info.Size),
1207                                         NicenessFmt(info.Nice),
1208                                 )
1209                         }
1210                         if !state.listOnly && info.Nice > state.Nice {
1211                                 state.Ctx.LogD("sp-process-info-too-nice", lesp, func(les LEs) string {
1212                                         return logMsg(les) + ": too nice"
1213                                 })
1214                                 continue
1215                         }
1216                         state.Ctx.LogD("sp-process-info-got", lesp, func(les LEs) string {
1217                                 return logMsg(les) + ": received"
1218                         })
1219                         if !state.listOnly && state.xxOnly == TTx {
1220                                 continue
1221                         }
1222                         state.Lock()
1223                         state.infosTheir[*info.Hash] = &info
1224                         state.Unlock()
1225                         state.Ctx.LogD("sp-process-info-stat", lesp, func(les LEs) string {
1226                                 return logMsg(les) + ": stating part"
1227                         })
1228                         pktPath := filepath.Join(
1229                                 state.Ctx.Spool,
1230                                 state.Node.Id.String(),
1231                                 string(TRx),
1232                                 Base32Codec.EncodeToString(info.Hash[:]),
1233                         )
1234                         logMsg = func(les LEs) string {
1235                                 return fmt.Sprintf(
1236                                         "Packet %s (%s) (nice %s)",
1237                                         pktName,
1238                                         humanize.IBytes(info.Size),
1239                                         NicenessFmt(info.Nice),
1240                                 )
1241                         }
1242                         if _, err = os.Stat(pktPath); err == nil {
1243                                 state.Ctx.LogI("sp-info-done", lesp, func(les LEs) string {
1244                                         return logMsg(les) + ": already done"
1245                                 })
1246                                 if !state.listOnly {
1247                                         replies = append(replies, MarshalSP(SPTypeDone, SPDone{info.Hash}))
1248                                 }
1249                                 continue
1250                         }
1251                         if _, err = os.Stat(pktPath + SeenSuffix); err == nil {
1252                                 state.Ctx.LogI("sp-info-seen", lesp, func(les LEs) string {
1253                                         return logMsg(les) + ": already seen"
1254                                 })
1255                                 if !state.listOnly {
1256                                         replies = append(replies, MarshalSP(SPTypeDone, SPDone{info.Hash}))
1257                                 }
1258                                 continue
1259                         }
1260                         if _, err = os.Stat(pktPath + NoCKSuffix); err == nil {
1261                                 state.Ctx.LogI("sp-info-nock", lesp, func(les LEs) string {
1262                                         return logMsg(les) + ": still not checksummed"
1263                                 })
1264                                 continue
1265                         }
1266                         fi, err := os.Stat(pktPath + PartSuffix)
1267                         var offset int64
1268                         if err == nil {
1269                                 offset = fi.Size()
1270                         }
1271                         if !state.Ctx.IsEnoughSpace(int64(info.Size) - offset) {
1272                                 state.Ctx.LogI("sp-info-no-space", lesp, func(les LEs) string {
1273                                         return logMsg(les) + ": not enough space"
1274                                 })
1275                                 continue
1276                         }
1277                         state.Ctx.LogI(
1278                                 "sp-info",
1279                                 append(lesp, LE{"Offset", offset}),
1280                                 func(les LEs) string {
1281                                         return fmt.Sprintf(
1282                                                 "%s: %d%%", logMsg(les), 100*uint64(offset)/info.Size,
1283                                         )
1284                                 },
1285                         )
1286                         if !state.listOnly && (state.onlyPkts == nil || state.onlyPkts[*info.Hash]) {
1287                                 replies = append(replies, MarshalSP(
1288                                         SPTypeFreq,
1289                                         SPFreq{info.Hash, uint64(offset)},
1290                                 ))
1291                         }
1292
1293                 case SPTypeFile:
1294                         lesp := append(les, LE{"Type", "file"})
1295                         state.Ctx.LogD("sp-process-file", lesp, func(les LEs) string {
1296                                 return fmt.Sprintf(
1297                                         "SP with %s (nice %s): unmarshaling FILE",
1298                                         state.Node.Name, NicenessFmt(state.Nice),
1299                                 )
1300                         })
1301                         var file SPFile
1302                         if _, err = xdr.Unmarshal(r, &file); err != nil {
1303                                 state.Ctx.LogE("sp-process-file", lesp, err, func(les LEs) string {
1304                                         return fmt.Sprintf(
1305                                                 "SP with %s (nice %s): unmarshaling FILE",
1306                                                 state.Node.Name, NicenessFmt(state.Nice),
1307                                         )
1308                                 })
1309                                 return nil, err
1310                         }
1311                         pktName := Base32Codec.EncodeToString(file.Hash[:])
1312                         lesp = append(
1313                                 lesp,
1314                                 LE{"XX", string(TRx)},
1315                                 LE{"Pkt", pktName},
1316                                 LE{"Size", int64(len(file.Payload))},
1317                         )
1318                         logMsg := func(les LEs) string {
1319                                 return fmt.Sprintf(
1320                                         "Got packet %s (%s)",
1321                                         pktName, humanize.IBytes(uint64(len(file.Payload))),
1322                                 )
1323                         }
1324                         fullsize := int64(0)
1325                         state.RLock()
1326                         infoTheir, ok := state.infosTheir[*file.Hash]
1327                         state.RUnlock()
1328                         if !ok {
1329                                 state.Ctx.LogE("sp-file-open", lesp, err, func(les LEs) string {
1330                                         return logMsg(les) + ": unknown file"
1331                                 })
1332                                 continue
1333                         }
1334                         fullsize = int64(infoTheir.Size)
1335                         lesp = append(lesp, LE{"FullSize", fullsize})
1336                         dirToSync := filepath.Join(
1337                                 state.Ctx.Spool,
1338                                 state.Node.Id.String(),
1339                                 string(TRx),
1340                         )
1341                         filePath := filepath.Join(dirToSync, pktName)
1342                         filePathPart := filePath + PartSuffix
1343                         state.Ctx.LogD("sp-file-open", lesp, func(les LEs) string {
1344                                 return logMsg(les) + ": opening part"
1345                         })
1346                         state.fdsLock.RLock()
1347                         fdAndFullSize, exists := state.fds[filePathPart]
1348                         state.fdsLock.RUnlock()
1349                         hasherAndOffset := state.fileHashers[filePath]
1350                         var fd *os.File
1351                         if exists {
1352                                 fd = fdAndFullSize.fd
1353                         } else {
1354                                 fd, err = os.OpenFile(
1355                                         filePathPart,
1356                                         os.O_RDWR|os.O_CREATE,
1357                                         os.FileMode(0666),
1358                                 )
1359                                 if err != nil {
1360                                         state.Ctx.LogE("sp-file-open", lesp, err, func(les LEs) string {
1361                                                 return logMsg(les) + ": opening part"
1362                                         })
1363                                         return nil, err
1364                                 }
1365                                 state.fdsLock.Lock()
1366                                 state.fds[filePathPart] = FdAndFullSize{fd: fd}
1367                                 state.fdsLock.Unlock()
1368                                 if !state.NoCK {
1369                                         hasherAndOffset = &MTHAndOffset{
1370                                                 mth:    MTHNew(fullsize, int64(file.Offset)),
1371                                                 offset: file.Offset,
1372                                         }
1373                                         state.fileHashers[filePath] = hasherAndOffset
1374                                 }
1375                         }
1376                         state.Ctx.LogD(
1377                                 "sp-file-seek",
1378                                 append(lesp, LE{"Offset", file.Offset}),
1379                                 func(les LEs) string {
1380                                         return fmt.Sprintf("%s: seeking %d", logMsg(les), file.Offset)
1381                                 })
1382                         if _, err = fd.Seek(int64(file.Offset), io.SeekStart); err != nil {
1383                                 state.Ctx.LogE("sp-file-seek", lesp, err, func(les LEs) string {
1384                                         return logMsg(les) + ": seeking"
1385                                 })
1386                                 state.closeFd(filePathPart)
1387                                 return nil, err
1388                         }
1389                         state.Ctx.LogD("sp-file-write", lesp, func(les LEs) string {
1390                                 return logMsg(les) + ": writing"
1391                         })
1392                         if _, err = fd.Write(file.Payload); err != nil {
1393                                 state.Ctx.LogE("sp-file-write", lesp, err, func(les LEs) string {
1394                                         return logMsg(les) + ": writing"
1395                                 })
1396                                 state.closeFd(filePathPart)
1397                                 return nil, err
1398                         }
1399                         if hasherAndOffset != nil {
1400                                 if hasherAndOffset.offset == file.Offset {
1401                                         if _, err = hasherAndOffset.mth.Write(file.Payload); err != nil {
1402                                                 panic(err)
1403                                         }
1404                                         hasherAndOffset.offset += uint64(len(file.Payload))
1405                                 } else {
1406                                         state.Ctx.LogE(
1407                                                 "sp-file-offset-differs", lesp, errors.New("offset differs"),
1408                                                 func(les LEs) string {
1409                                                         return logMsg(les) + ": deleting hasher"
1410                                                 },
1411                                         )
1412                                         delete(state.fileHashers, filePath)
1413                                         hasherAndOffset = nil
1414                                 }
1415                         }
1416                         ourSize := int64(file.Offset + uint64(len(file.Payload)))
1417                         lesp[len(lesp)-2].V = ourSize
1418                         if state.Ctx.ShowPrgrs {
1419                                 state.progressBars[pktName] = struct{}{}
1420                                 Progress("Rx", lesp)
1421                         }
1422                         if fullsize != ourSize {
1423                                 continue
1424                         }
1425                         if state.Ctx.ShowPrgrs {
1426                                 delete(state.progressBars, pktName)
1427                         }
1428                         logMsg = func(les LEs) string {
1429                                 return fmt.Sprintf(
1430                                         "Got packet %s %d%% (%s / %s)",
1431                                         pktName, 100*ourSize/fullsize,
1432                                         humanize.IBytes(uint64(ourSize)),
1433                                         humanize.IBytes(uint64(fullsize)),
1434                                 )
1435                         }
1436                         err = fd.Sync()
1437                         if err != nil {
1438                                 state.Ctx.LogE("sp-file-sync", lesp, err, func(les LEs) string {
1439                                         return logMsg(les) + ": syncing"
1440                                 })
1441                                 state.closeFd(filePathPart)
1442                                 continue
1443                         }
1444                         if hasherAndOffset != nil {
1445                                 delete(state.fileHashers, filePath)
1446                                 if hasherAndOffset.mth.PrependSize() == 0 {
1447                                         if bytes.Compare(hasherAndOffset.mth.Sum(nil), file.Hash[:]) != 0 {
1448                                                 state.Ctx.LogE(
1449                                                         "sp-file-bad-checksum", lesp,
1450                                                         errors.New("checksum mismatch"),
1451                                                         logMsg,
1452                                                 )
1453                                                 state.closeFd(filePathPart)
1454                                                 continue
1455                                         }
1456                                         if err = os.Rename(filePathPart, filePath); err != nil {
1457                                                 state.Ctx.LogE("sp-file-rename", lesp, err, func(les LEs) string {
1458                                                         return logMsg(les) + ": renaming"
1459                                                 })
1460                                                 state.closeFd(filePathPart)
1461                                                 continue
1462                                         }
1463                                         if err = DirSync(dirToSync); err != nil {
1464                                                 state.Ctx.LogE("sp-file-dirsync", lesp, err, func(les LEs) string {
1465                                                         return logMsg(les) + ": dirsyncing"
1466                                                 })
1467                                                 state.closeFd(filePathPart)
1468                                                 continue
1469                                         }
1470                                         state.Ctx.LogI("sp-file-done", lesp, func(les LEs) string {
1471                                                 return logMsg(les) + ": done"
1472                                         })
1473                                         state.wg.Add(1)
1474                                         go func() {
1475                                                 state.payloads <- MarshalSP(SPTypeDone, SPDone{file.Hash})
1476                                                 state.wg.Done()
1477                                         }()
1478                                         state.Lock()
1479                                         delete(state.infosTheir, *file.Hash)
1480                                         state.Unlock()
1481                                         if !state.Ctx.HdrUsage {
1482                                                 continue
1483                                         }
1484                                         if _, err = fd.Seek(0, io.SeekStart); err != nil {
1485                                                 state.Ctx.LogE("sp-file-seek", lesp, err, func(les LEs) string {
1486                                                         return logMsg(les) + ": seeking"
1487                                                 })
1488                                                 state.closeFd(filePathPart)
1489                                                 continue
1490                                         }
1491                                         _, pktEncRaw, err := state.Ctx.HdrRead(fd)
1492                                         state.closeFd(filePathPart)
1493                                         if err != nil {
1494                                                 state.Ctx.LogE("sp-file-hdr-read", lesp, err, func(les LEs) string {
1495                                                         return logMsg(les) + ": HdrReading"
1496                                                 })
1497                                                 continue
1498                                         }
1499                                         state.Ctx.HdrWrite(pktEncRaw, filePath)
1500                                         continue
1501                                 }
1502                         }
1503                         state.closeFd(filePathPart)
1504                         if err = os.Rename(filePathPart, filePath+NoCKSuffix); err != nil {
1505                                 state.Ctx.LogE("sp-file-rename", lesp, err, func(les LEs) string {
1506                                         return logMsg(les) + ": renaming"
1507                                 })
1508                                 continue
1509                         }
1510                         if err = DirSync(dirToSync); err != nil {
1511                                 state.Ctx.LogE("sp-file-dirsync", lesp, err, func(les LEs) string {
1512                                         return logMsg(les) + ": dirsyncing"
1513                                 })
1514                                 continue
1515                         }
1516                         state.Ctx.LogI("sp-file-downloaded", lesp, func(les LEs) string {
1517                                 return logMsg(les) + ": downloaded"
1518                         })
1519                         state.Lock()
1520                         delete(state.infosTheir, *file.Hash)
1521                         state.Unlock()
1522                         go func() {
1523                                 t := SPCheckerTask{
1524                                         nodeId: state.Node.Id,
1525                                         hsh:    file.Hash,
1526                                         done:   state.payloads,
1527                                 }
1528                                 if hasherAndOffset != nil {
1529                                         t.mth = hasherAndOffset.mth
1530                                 }
1531                                 spCheckerTasks <- t
1532                         }()
1533
1534                 case SPTypeDone:
1535                         lesp := append(les, LE{"Type", "done"})
1536                         state.Ctx.LogD("sp-process-done-unmarshal", lesp, func(les LEs) string {
1537                                 return fmt.Sprintf(
1538                                         "SP with %s (nice %s): unmarshaling DONE",
1539                                         state.Node.Name, NicenessFmt(state.Nice),
1540                                 )
1541                         })
1542                         var done SPDone
1543                         if _, err = xdr.Unmarshal(r, &done); err != nil {
1544                                 state.Ctx.LogE("sp-process-done-unmarshal", lesp, err, func(les LEs) string {
1545                                         return fmt.Sprintf(
1546                                                 "SP with %s (nice %s): unmarshaling DONE",
1547                                                 state.Node.Name, NicenessFmt(state.Nice),
1548                                         )
1549                                 })
1550                                 return nil, err
1551                         }
1552                         pktName := Base32Codec.EncodeToString(done.Hash[:])
1553                         lesp = append(lesp, LE{"Pkt", pktName}, LE{"XX", string(TTx)})
1554                         logMsg := func(les LEs) string {
1555                                 return fmt.Sprintf(
1556                                         "SP with %s (nice %s): DONE: removing %s",
1557                                         state.Node.Name, NicenessFmt(state.Nice), pktName,
1558                                 )
1559                         }
1560                         state.Ctx.LogD("sp-done", lesp, logMsg)
1561                         pth := filepath.Join(
1562                                 state.Ctx.Spool,
1563                                 state.Node.Id.String(),
1564                                 string(TTx),
1565                                 pktName,
1566                         )
1567                         if err = os.Remove(pth); err == nil {
1568                                 state.Ctx.LogI("sp-done", lesp, func(les LEs) string {
1569                                         return fmt.Sprintf("Packet %s is sent", pktName)
1570                                 })
1571                                 if state.Ctx.HdrUsage {
1572                                         os.Remove(pth + HdrSuffix)
1573                                 }
1574                         } else {
1575                                 state.Ctx.LogE("sp-done", lesp, err, logMsg)
1576                         }
1577
1578                 case SPTypeFreq:
1579                         lesp := append(les, LE{"Type", "freq"})
1580                         state.Ctx.LogD("sp-process-freq", lesp, func(les LEs) string {
1581                                 return fmt.Sprintf(
1582                                         "SP with %s (nice %s): unmarshaling FREQ",
1583                                         state.Node.Name, NicenessFmt(state.Nice),
1584                                 )
1585                         })
1586                         var freq SPFreq
1587                         if _, err = xdr.Unmarshal(r, &freq); err != nil {
1588                                 state.Ctx.LogE("sp-process-freq", lesp, err, func(les LEs) string {
1589                                         return fmt.Sprintf(
1590                                                 "SP with %s (nice %s): unmarshaling FREQ",
1591                                                 state.Node.Name, NicenessFmt(state.Nice),
1592                                         )
1593                                 })
1594                                 return nil, err
1595                         }
1596                         pktName := Base32Codec.EncodeToString(freq.Hash[:])
1597                         lesp = append(lesp, LE{"Pkt", pktName}, LE{"Offset", freq.Offset})
1598                         state.Ctx.LogD("sp-process-freq-queueing", lesp, func(les LEs) string {
1599                                 return fmt.Sprintf(
1600                                         "SP with %s (nice %s): FREQ %s: queuing",
1601                                         state.Node.Name, NicenessFmt(state.Nice), pktName,
1602                                 )
1603                         })
1604                         nice, exists := state.infosOurSeen[*freq.Hash]
1605                         if exists {
1606                                 if state.onlyPkts == nil || !state.onlyPkts[*freq.Hash] {
1607                                         state.Lock()
1608                                         insertIdx := 0
1609                                         var freqWithNice *FreqWithNice
1610                                         for insertIdx, freqWithNice = range state.queueTheir {
1611                                                 if freqWithNice.nice > nice {
1612                                                         break
1613                                                 }
1614                                         }
1615                                         state.queueTheir = append(state.queueTheir, nil)
1616                                         copy(state.queueTheir[insertIdx+1:], state.queueTheir[insertIdx:])
1617                                         state.queueTheir[insertIdx] = &FreqWithNice{&freq, nice}
1618                                         state.Unlock()
1619                                 } else {
1620                                         state.Ctx.LogD("sp-process-freq-skip", lesp, func(les LEs) string {
1621                                                 return fmt.Sprintf(
1622                                                         "SP with %s (nice %s): FREQ %s: skipping",
1623                                                         state.Node.Name, NicenessFmt(state.Nice), pktName,
1624                                                 )
1625                                         })
1626                                 }
1627                         } else {
1628                                 state.Ctx.LogD("sp-process-freq-unknown", lesp, func(les LEs) string {
1629                                         return fmt.Sprintf(
1630                                                 "SP with %s (nice %s): FREQ %s: unknown",
1631                                                 state.Node.Name, NicenessFmt(state.Nice), pktName,
1632                                         )
1633                                 })
1634                         }
1635
1636                 default:
1637                         state.Ctx.LogE(
1638                                 "sp-process-type-unknown",
1639                                 append(les, LE{"Type", head.Type}),
1640                                 errors.New("unknown type"),
1641                                 func(les LEs) string {
1642                                         return fmt.Sprintf(
1643                                                 "SP with %s (nice %s): %d",
1644                                                 state.Node.Name, NicenessFmt(state.Nice), head.Type,
1645                                         )
1646                                 },
1647                         )
1648                         return nil, BadPktType
1649                 }
1650         }
1651
1652         if infosGot {
1653                 var pkts int
1654                 var size uint64
1655                 state.RLock()
1656                 for _, info := range state.infosTheir {
1657                         pkts++
1658                         size += info.Size
1659                 }
1660                 state.RUnlock()
1661                 state.Ctx.LogI("sp-infos-rx", LEs{
1662                         {"XX", string(TRx)},
1663                         {"Node", state.Node.Id},
1664                         {"Pkts", pkts},
1665                         {"Size", int64(size)},
1666                 }, func(les LEs) string {
1667                         return fmt.Sprintf(
1668                                 "%s has got for us: %d packets, %s",
1669                                 state.Node.Name, pkts, humanize.IBytes(size),
1670                         )
1671                 })
1672         }
1673         return payloadsSplit(replies), nil
1674 }
1675
1676 func SPChecker(ctx *Ctx) {
1677         for t := range spCheckerTasks {
1678                 pktName := Base32Codec.EncodeToString(t.hsh[:])
1679                 les := LEs{
1680                         {"XX", string(TRx)},
1681                         {"Node", t.nodeId},
1682                         {"Pkt", pktName},
1683                 }
1684                 SPCheckerWg.Add(1)
1685                 ctx.LogD("sp-checker", les, func(les LEs) string {
1686                         return fmt.Sprintf("Checksumming %s/rx/%s", ctx.NodeName(t.nodeId), pktName)
1687                 })
1688                 size, err := ctx.CheckNoCK(t.nodeId, t.hsh, t.mth)
1689                 les = append(les, LE{"Size", size})
1690                 if err != nil {
1691                         ctx.LogE("sp-checker", les, err, func(les LEs) string {
1692                                 return fmt.Sprintf(
1693                                         "Checksumming %s/rx/%s (%s)", ctx.NodeName(t.nodeId), pktName,
1694                                         humanize.IBytes(uint64(size)),
1695                                 )
1696                         })
1697                         SPCheckerWg.Done()
1698                         continue
1699                 }
1700                 ctx.LogI("sp-checker-done", les, func(les LEs) string {
1701                         return fmt.Sprintf(
1702                                 "Packet %s is retreived (%s)",
1703                                 pktName, humanize.IBytes(uint64(size)),
1704                         )
1705                 })
1706                 SPCheckerWg.Done()
1707                 go func(t SPCheckerTask) {
1708                         defer func() { recover() }()
1709                         t.done <- MarshalSP(SPTypeDone, SPDone{t.hsh})
1710                 }(t)
1711         }
1712 }