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