src/cypherpunks.ru/nncp/sp.go

   1 /*
   2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
   3 Copyright (C) 2016-2018 Sergey Matveev <stargrave@stargrave.org>
   4
   5 This program is free software: you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation, either version 3 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 package nncp
  20
  21 import (
  22         "bytes"
  23         "crypto/subtle"
  24         "errors"
  25         "io"
  26         "net"
  27         "os"
  28         "path/filepath"
  29         "sort"
  30         "strconv"
  31         "sync"
  32         "time"
  33
  34         "github.com/davecgh/go-xdr/xdr2"
  35         "github.com/flynn/noise"
  36 )
  37
  38 const (
  39         MaxSPSize       = 1<<16 - 256
  40         PartSuffix      = ".part"
  41         DefaultDeadline = 10
  42 )
  43
  44 var (
  45         MagicNNCPLv1 [8]byte = [8]byte{'N', 'N', 'C', 'P', 'S', 0, 0, 1}
  46
  47         SPHeadOverhead    int
  48         SPInfoOverhead    int
  49         SPFreqOverhead    int
  50         SPFileOverhead    int
  51         SPHaltMarshalized []byte
  52
  53         NoiseCipherSuite noise.CipherSuite = noise.NewCipherSuite(
  54                 noise.DH25519,
  55                 noise.CipherChaChaPoly,
  56                 noise.HashBLAKE2b,
  57         )
  58
  59         spWorkersGroup sync.WaitGroup
  60 )
  61
  62 type SPType uint8
  63
  64 const (
  65         SPTypeInfo SPType = iota
  66         SPTypeFreq SPType = iota
  67         SPTypeFile SPType = iota
  68         SPTypeDone SPType = iota
  69         SPTypeHalt SPType = iota
  70 )
  71
  72 type SPHead struct {
  73         Type SPType
  74 }
  75
  76 type SPInfo struct {
  77         Nice uint8
  78         Size uint64
  79         Hash *[32]byte
  80 }
  81
  82 type SPFreq struct {
  83         Hash   *[32]byte
  84         Offset uint64
  85 }
  86
  87 type SPFile struct {
  88         Hash    *[32]byte
  89         Offset  uint64
  90         Payload []byte
  91 }
  92
  93 type SPDone struct {
  94         Hash *[32]byte
  95 }
  96
  97 type SPRaw struct {
  98         Magic   [8]byte
  99         Payload []byte
 100 }
 101
 102 type FreqWithNice struct {
 103         freq *SPFreq
 104         nice uint8
 105 }
 106
 107 func init() {
 108         var buf bytes.Buffer
 109         spHead := SPHead{Type: SPTypeHalt}
 110         if _, err := xdr.Marshal(&buf, spHead); err != nil {
 111                 panic(err)
 112         }
 113         copy(SPHaltMarshalized, buf.Bytes())
 114         SPHeadOverhead = buf.Len()
 115         buf.Reset()
 116
 117         spInfo := SPInfo{Nice: 123, Size: 123, Hash: new([32]byte)}
 118         if _, err := xdr.Marshal(&buf, spInfo); err != nil {
 119                 panic(err)
 120         }
 121         SPInfoOverhead = buf.Len()
 122         buf.Reset()
 123
 124         spFreq := SPFreq{Hash: new([32]byte), Offset: 123}
 125         if _, err := xdr.Marshal(&buf, spFreq); err != nil {
 126                 panic(err)
 127         }
 128         SPFreqOverhead = buf.Len()
 129         buf.Reset()
 130
 131         spFile := SPFile{Hash: new([32]byte), Offset: 123}
 132         if _, err := xdr.Marshal(&buf, spFile); err != nil {
 133                 panic(err)
 134         }
 135         SPFileOverhead = buf.Len()
 136 }
 137
 138 func MarshalSP(typ SPType, sp interface{}) []byte {
 139         var buf bytes.Buffer
 140         var err error
 141         if _, err = xdr.Marshal(&buf, SPHead{typ}); err != nil {
 142                 panic(err)
 143         }
 144         if _, err = xdr.Marshal(&buf, sp); err != nil {
 145                 panic(err)
 146         }
 147         return buf.Bytes()
 148 }
 149
 150 func payloadsSplit(payloads [][]byte) [][]byte {
 151         var outbounds [][]byte
 152         outbound := make([]byte, 0, MaxSPSize)
 153         for i, payload := range payloads {
 154                 outbound = append(outbound, payload...)
 155                 if i+1 < len(payloads) && len(outbound)+len(payloads[i+1]) > MaxSPSize {
 156                         outbounds = append(outbounds, outbound)
 157                         outbound = make([]byte, 0, MaxSPSize)
 158                 }
 159         }
 160         if len(outbound) > 0 {
 161                 outbounds = append(outbounds, outbound)
 162         }
 163         return outbounds
 164 }
 165
 166 type SPState struct {
 167         ctx            *Ctx
 168         Node           *Node
 169         onlineDeadline uint
 170         maxOnlineTime  uint
 171         nice           uint8
 172         hs             *noise.HandshakeState
 173         csOur          *noise.CipherState
 174         csTheir        *noise.CipherState
 175         payloads       chan []byte
 176         infosTheir     map[[32]byte]*SPInfo
 177         infosOurSeen   map[[32]byte]uint8
 178         queueTheir     []*FreqWithNice
 179         wg             sync.WaitGroup
 180         RxBytes        int64
 181         RxLastSeen     time.Time
 182         TxBytes        int64
 183         TxLastSeen     time.Time
 184         started        time.Time
 185         Duration       time.Duration
 186         RxSpeed        int64
 187         TxSpeed        int64
 188         rxLock         *os.File
 189         txLock         *os.File
 190         xxOnly         TRxTx
 191         rxRate         int
 192         txRate         int
 193         isDead         bool
 194         sync.RWMutex
 195 }
 196
 197 func (state *SPState) NotAlive() bool {
 198         if state.isDead {
 199                 return true
 200         }
 201         now := time.Now()
 202         if state.maxOnlineTime > 0 && state.started.Add(time.Duration(state.maxOnlineTime)*time.Second).Before(now) {
 203                 return true
 204         }
 205         return uint(now.Sub(state.RxLastSeen).Seconds()) >= state.onlineDeadline && uint(now.Sub(state.TxLastSeen).Seconds()) >= state.onlineDeadline
 206 }
 207
 208 func (state *SPState) dirUnlock() {
 209         state.ctx.UnlockDir(state.rxLock)
 210         state.ctx.UnlockDir(state.txLock)
 211 }
 212
 213 func (state *SPState) WriteSP(dst io.Writer, payload []byte) error {
 214         n, err := xdr.Marshal(dst, SPRaw{Magic: MagicNNCPLv1, Payload: payload})
 215         if err == nil {
 216                 state.TxLastSeen = time.Now()
 217                 state.TxBytes += int64(n)
 218         }
 219         return err
 220 }
 221
 222 func (state *SPState) ReadSP(src io.Reader) ([]byte, error) {
 223         var sp SPRaw
 224         n, err := xdr.UnmarshalLimited(src, &sp, 1<<17)
 225         if err != nil {
 226                 return nil, err
 227         }
 228         state.RxLastSeen = time.Now()
 229         state.RxBytes += int64(n)
 230         if sp.Magic != MagicNNCPLv1 {
 231                 return nil, BadMagic
 232         }
 233         return sp.Payload, nil
 234 }
 235
 236 func (ctx *Ctx) infosOur(nodeId *NodeId, nice uint8, seen *map[[32]byte]uint8) [][]byte {
 237         var infos []*SPInfo
 238         var totalSize int64
 239         for job := range ctx.Jobs(nodeId, TTx) {
 240                 job.Fd.Close()
 241                 if job.PktEnc.Nice > nice {
 242                         continue
 243                 }
 244                 if _, known := (*seen)[*job.HshValue]; known {
 245                         continue
 246                 }
 247                 totalSize += job.Size
 248                 infos = append(infos, &SPInfo{
 249                         Nice: job.PktEnc.Nice,
 250                         Size: uint64(job.Size),
 251                         Hash: job.HshValue,
 252                 })
 253                 (*seen)[*job.HshValue] = job.PktEnc.Nice
 254         }
 255         sort.Sort(ByNice(infos))
 256         var payloads [][]byte
 257         for _, info := range infos {
 258                 payloads = append(payloads, MarshalSP(SPTypeInfo, info))
 259                 ctx.LogD("sp-info-our", SDS{
 260                         "node": nodeId,
 261                         "name": ToBase32(info.Hash[:]),
 262                         "size": strconv.FormatInt(int64(info.Size), 10),
 263                 }, "")
 264         }
 265         if totalSize > 0 {
 266                 ctx.LogI("sp-infos", SDS{
 267                         "xx":   string(TTx),
 268                         "node": nodeId,
 269                         "pkts": strconv.Itoa(len(payloads)),
 270                         "size": strconv.FormatInt(totalSize, 10),
 271                 }, "")
 272         }
 273         return payloadsSplit(payloads)
 274 }
 275
 276 func (ctx *Ctx) StartI(conn net.Conn, nodeId *NodeId, nice uint8, xxOnly TRxTx, rxRate, txRate int, onlineDeadline, maxOnlineTime uint) (*SPState, error) {
 277         err := ctx.ensureRxDir(nodeId)
 278         if err != nil {
 279                 return nil, err
 280         }
 281         var rxLock *os.File
 282         if xxOnly == "" || xxOnly == TRx {
 283                 rxLock, err = ctx.LockDir(nodeId, TRx)
 284                 if err != nil {
 285                         return nil, err
 286                 }
 287         }
 288         var txLock *os.File
 289         if xxOnly == "" || xxOnly == TTx {
 290                 txLock, err = ctx.LockDir(nodeId, TTx)
 291                 if err != nil {
 292                         return nil, err
 293                 }
 294         }
 295         started := time.Now()
 296         node := ctx.Neigh[*nodeId]
 297         conf := noise.Config{
 298                 CipherSuite: NoiseCipherSuite,
 299                 Pattern:     noise.HandshakeIK,
 300                 Initiator:   true,
 301                 StaticKeypair: noise.DHKey{
 302                         Private: ctx.Self.NoisePrv[:],
 303                         Public:  ctx.Self.NoisePub[:],
 304                 },
 305                 PeerStatic: node.NoisePub[:],
 306         }
 307         hs, err := noise.NewHandshakeState(conf)
 308         if err != nil {
 309                 return nil, err
 310         }
 311         state := SPState{
 312                 ctx:            ctx,
 313                 hs:             hs,
 314                 Node:           node,
 315                 onlineDeadline: onlineDeadline,
 316                 maxOnlineTime:  maxOnlineTime,
 317                 nice:           nice,
 318                 payloads:       make(chan []byte),
 319                 infosTheir:     make(map[[32]byte]*SPInfo),
 320                 infosOurSeen:   make(map[[32]byte]uint8),
 321                 started:        started,
 322                 rxLock:         rxLock,
 323                 txLock:         txLock,
 324                 xxOnly:         xxOnly,
 325                 rxRate:         rxRate,
 326                 txRate:         txRate,
 327         }
 328
 329         var infosPayloads [][]byte
 330         if xxOnly == "" || xxOnly == TTx {
 331                 infosPayloads = ctx.infosOur(nodeId, nice, &state.infosOurSeen)
 332         }
 333         var firstPayload []byte
 334         if len(infosPayloads) > 0 {
 335                 firstPayload = infosPayloads[0]
 336         }
 337         // Pad first payload, to hide actual number of existing files
 338         for i := 0; i < (MaxSPSize-len(firstPayload))/SPHeadOverhead; i++ {
 339                 firstPayload = append(firstPayload, SPHaltMarshalized...)
 340         }
 341
 342         var buf []byte
 343         var payload []byte
 344         buf, _, _, err = state.hs.WriteMessage(nil, firstPayload)
 345         if err != nil {
 346                 state.dirUnlock()
 347                 return nil, err
 348         }
 349         sds := SDS{"node": nodeId, "nice": strconv.Itoa(int(nice))}
 350         ctx.LogD("sp-start", sds, "sending first message")
 351         conn.SetWriteDeadline(time.Now().Add(DefaultDeadline * time.Second))
 352         if err = state.WriteSP(conn, buf); err != nil {
 353                 ctx.LogE("sp-start", SdsAdd(sds, SDS{"err": err}), "")
 354                 state.dirUnlock()
 355                 return nil, err
 356         }
 357         ctx.LogD("sp-start", sds, "waiting for first message")
 358         conn.SetReadDeadline(time.Now().Add(DefaultDeadline * time.Second))
 359         if buf, err = state.ReadSP(conn); err != nil {
 360                 ctx.LogE("sp-start", SdsAdd(sds, SDS{"err": err}), "")
 361                 state.dirUnlock()
 362                 return nil, err
 363         }
 364         payload, state.csOur, state.csTheir, err = state.hs.ReadMessage(nil, buf)
 365         if err != nil {
 366                 ctx.LogE("sp-start", SdsAdd(sds, SDS{"err": err}), "")
 367                 state.dirUnlock()
 368                 return nil, err
 369         }
 370         ctx.LogD("sp-start", sds, "starting workers")
 371         err = state.StartWorkers(conn, infosPayloads, payload)
 372         if err != nil {
 373                 ctx.LogE("sp-start", SdsAdd(sds, SDS{"err": err}), "")
 374                 state.dirUnlock()
 375                 return nil, err
 376         }
 377         return &state, err
 378 }
 379
 380 func (ctx *Ctx) StartR(conn net.Conn, nice uint8, xxOnly TRxTx) (*SPState, error) {
 381         started := time.Now()
 382         conf := noise.Config{
 383                 CipherSuite: NoiseCipherSuite,
 384                 Pattern:     noise.HandshakeIK,
 385                 Initiator:   false,
 386                 StaticKeypair: noise.DHKey{
 387                         Private: ctx.Self.NoisePrv[:],
 388                         Public:  ctx.Self.NoisePub[:],
 389                 },
 390         }
 391         hs, err := noise.NewHandshakeState(conf)
 392         if err != nil {
 393                 return nil, err
 394         }
 395         state := SPState{
 396                 ctx:          ctx,
 397                 hs:           hs,
 398                 nice:         nice,
 399                 payloads:     make(chan []byte),
 400                 infosOurSeen: make(map[[32]byte]uint8),
 401                 infosTheir:   make(map[[32]byte]*SPInfo),
 402                 started:      started,
 403                 xxOnly:       xxOnly,
 404         }
 405         var buf []byte
 406         var payload []byte
 407         ctx.LogD(
 408                 "sp-start",
 409                 SDS{"nice": strconv.Itoa(int(nice))},
 410                 "waiting for first message",
 411         )
 412         conn.SetReadDeadline(time.Now().Add(DefaultDeadline * time.Second))
 413         if buf, err = state.ReadSP(conn); err != nil {
 414                 ctx.LogE("sp-start", SDS{"err": err}, "")
 415                 return nil, err
 416         }
 417         if payload, _, _, err = state.hs.ReadMessage(nil, buf); err != nil {
 418                 ctx.LogE("sp-start", SDS{"err": err}, "")
 419                 return nil, err
 420         }
 421
 422         var node *Node
 423         for _, node = range ctx.Neigh {
 424                 if subtle.ConstantTimeCompare(state.hs.PeerStatic(), node.NoisePub[:]) == 1 {
 425                         break
 426                 }
 427         }
 428         if node == nil {
 429                 peerId := ToBase32(state.hs.PeerStatic())
 430                 ctx.LogE("sp-start", SDS{"peer": peerId}, "unknown")
 431                 return nil, errors.New("Unknown peer: " + peerId)
 432         }
 433         state.Node = node
 434         state.rxRate = node.RxRate
 435         state.txRate = node.TxRate
 436         state.onlineDeadline = node.OnlineDeadline
 437         state.maxOnlineTime = node.MaxOnlineTime
 438         sds := SDS{"node": node.Id, "nice": strconv.Itoa(int(nice))}
 439
 440         if ctx.ensureRxDir(node.Id); err != nil {
 441                 return nil, err
 442         }
 443         var rxLock *os.File
 444         if xxOnly == "" || xxOnly == TRx {
 445                 rxLock, err = ctx.LockDir(node.Id, TRx)
 446                 if err != nil {
 447                         return nil, err
 448                 }
 449         }
 450         state.rxLock = rxLock
 451         var txLock *os.File
 452         if xxOnly == "" || xxOnly == TTx {
 453                 txLock, err = ctx.LockDir(node.Id, TTx)
 454                 if err != nil {
 455                         return nil, err
 456                 }
 457         }
 458         state.txLock = txLock
 459
 460         var infosPayloads [][]byte
 461         if xxOnly == "" || xxOnly == TTx {
 462                 infosPayloads = ctx.infosOur(node.Id, nice, &state.infosOurSeen)
 463         }
 464         var firstPayload []byte
 465         if len(infosPayloads) > 0 {
 466                 firstPayload = infosPayloads[0]
 467         }
 468         // Pad first payload, to hide actual number of existing files
 469         for i := 0; i < (MaxSPSize-len(firstPayload))/SPHeadOverhead; i++ {
 470                 firstPayload = append(firstPayload, SPHaltMarshalized...)
 471         }
 472
 473         ctx.LogD("sp-start", sds, "sending first message")
 474         buf, state.csTheir, state.csOur, err = state.hs.WriteMessage(nil, firstPayload)
 475         if err != nil {
 476                 state.dirUnlock()
 477                 return nil, err
 478         }
 479         conn.SetWriteDeadline(time.Now().Add(DefaultDeadline * time.Second))
 480         if err = state.WriteSP(conn, buf); err != nil {
 481                 ctx.LogE("sp-start", SdsAdd(sds, SDS{"err": err}), "")
 482                 state.dirUnlock()
 483                 return nil, err
 484         }
 485         ctx.LogD("sp-start", sds, "starting workers")
 486         err = state.StartWorkers(conn, infosPayloads, payload)
 487         if err != nil {
 488                 state.dirUnlock()
 489                 return nil, err
 490         }
 491         return &state, err
 492 }
 493
 494 func (state *SPState) StartWorkers(conn net.Conn, infosPayloads [][]byte, payload []byte) error {
 495         sds := SDS{"node": state.Node.Id, "nice": strconv.Itoa(int(state.nice))}
 496         if len(infosPayloads) > 1 {
 497                 go func() {
 498                         for _, payload := range infosPayloads[1:] {
 499                                 state.ctx.LogD(
 500                                         "sp-work",
 501                                         SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
 502                                         "queuing remaining payload",
 503                                 )
 504                                 state.payloads <- payload
 505                         }
 506                 }()
 507         }
 508         state.ctx.LogD(
 509                 "sp-work",
 510                 SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
 511                 "processing first payload",
 512         )
 513         replies, err := state.ProcessSP(payload)
 514         if err != nil {
 515                 state.ctx.LogE("sp-work", SdsAdd(sds, SDS{"err": err}), "")
 516                 return err
 517         }
 518
 519         go func() {
 520                 for _, reply := range replies {
 521                         state.ctx.LogD(
 522                                 "sp-work",
 523                                 SdsAdd(sds, SDS{"size": strconv.Itoa(len(reply))}),
 524                                 "queuing reply",
 525                         )
 526                         state.payloads <- reply
 527                 }
 528         }()
 529
 530         if state.xxOnly == "" || state.xxOnly == TTx {
 531                 go func() {
 532                         for range time.Tick(time.Second) {
 533                                 for _, payload := range state.ctx.infosOur(
 534                                         state.Node.Id,
 535                                         state.nice,
 536                                         &state.infosOurSeen,
 537                                 ) {
 538                                         state.ctx.LogD(
 539                                                 "sp-work",
 540                                                 SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
 541                                                 "queuing new info",
 542                                         )
 543                                         state.payloads <- payload
 544                                 }
 545                         }
 546                 }()
 547         }
 548
 549         state.wg.Add(1)
 550         go func() {
 551                 defer func() {
 552                         state.isDead = true
 553                         state.wg.Done()
 554                 }()
 555                 for {
 556                         if state.NotAlive() {
 557                                 return
 558                         }
 559                         var payload []byte
 560                         select {
 561                         case payload = <-state.payloads:
 562                                 state.ctx.LogD(
 563                                         "sp-xmit",
 564                                         SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
 565                                         "got payload",
 566                                 )
 567                         default:
 568                         }
 569                         if payload == nil {
 570                                 state.RLock()
 571                                 if len(state.queueTheir) == 0 {
 572                                         state.ctx.LogD("sp-xmit", sds, "file queue is empty")
 573                                         state.RUnlock()
 574                                         time.Sleep(100 * time.Millisecond)
 575                                         continue
 576                                 }
 577                                 freq := state.queueTheir[0].freq
 578                                 state.RUnlock()
 579
 580                                 if state.txRate > 0 {
 581                                         time.Sleep(time.Second / time.Duration(state.txRate))
 582                                 }
 583
 584                                 sdsp := SdsAdd(sds, SDS{
 585                                         "xx":   string(TTx),
 586                                         "hash": ToBase32(freq.Hash[:]),
 587                                         "size": strconv.FormatInt(int64(freq.Offset), 10),
 588                                 })
 589                                 state.ctx.LogD("sp-file", sdsp, "queueing")
 590                                 fd, err := os.Open(filepath.Join(
 591                                         state.ctx.Spool,
 592                                         state.Node.Id.String(),
 593                                         string(TTx),
 594                                         ToBase32(freq.Hash[:]),
 595                                 ))
 596                                 if err != nil {
 597                                         state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
 598                                         break
 599                                 }
 600                                 fi, err := fd.Stat()
 601                                 if err != nil {
 602                                         state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
 603                                         break
 604                                 }
 605                                 fullSize := uint64(fi.Size())
 606                                 var buf []byte
 607                                 if freq.Offset < fullSize {
 608                                         state.ctx.LogD("sp-file", sdsp, "seeking")
 609                                         if _, err = fd.Seek(int64(freq.Offset), 0); err != nil {
 610                                                 state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
 611                                                 break
 612                                         }
 613                                         buf = make([]byte, MaxSPSize-SPHeadOverhead-SPFileOverhead)
 614                                         n, err := fd.Read(buf)
 615                                         if err != nil {
 616                                                 state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
 617                                                 break
 618                                         }
 619                                         buf = buf[:n]
 620                                         state.ctx.LogD(
 621                                                 "sp-file",
 622                                                 SdsAdd(sdsp, SDS{"size": strconv.Itoa(n)}),
 623                                                 "read",
 624                                         )
 625                                 }
 626                                 fd.Close()
 627                                 payload = MarshalSP(SPTypeFile, SPFile{
 628                                         Hash:    freq.Hash,
 629                                         Offset:  freq.Offset,
 630                                         Payload: buf,
 631                                 })
 632                                 ourSize := freq.Offset + uint64(len(buf))
 633                                 sdsp["size"] = strconv.FormatInt(int64(ourSize), 10)
 634                                 sdsp["fullsize"] = strconv.FormatInt(int64(fullSize), 10)
 635                                 state.ctx.LogP("sp-file", sdsp, "")
 636                                 state.Lock()
 637                                 if len(state.queueTheir) > 0 && *state.queueTheir[0].freq.Hash == *freq.Hash {
 638                                         if ourSize == fullSize {
 639                                                 state.ctx.LogD("sp-file", sdsp, "finished")
 640                                                 if len(state.queueTheir) > 1 {
 641                                                         state.queueTheir = state.queueTheir[1:]
 642                                                 } else {
 643                                                         state.queueTheir = state.queueTheir[:0]
 644                                                 }
 645                                         } else {
 646                                                 state.queueTheir[0].freq.Offset += uint64(len(buf))
 647                                         }
 648                                 } else {
 649                                         state.ctx.LogD("sp-file", sdsp, "queue disappeared")
 650                                 }
 651                                 state.Unlock()
 652                         }
 653                         state.ctx.LogD(
 654                                 "sp-xmit",
 655                                 SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
 656                                 "sending",
 657                         )
 658                         conn.SetWriteDeadline(time.Now().Add(10 * time.Second))
 659                         if err := state.WriteSP(conn, state.csOur.Encrypt(nil, nil, payload)); err != nil {
 660                                 state.ctx.LogE("sp-xmit", SdsAdd(sds, SDS{"err": err}), "")
 661                                 break
 662                         }
 663                 }
 664         }()
 665
 666         state.wg.Add(1)
 667         go func() {
 668                 defer func() {
 669                         state.isDead = true
 670                         state.wg.Done()
 671                 }()
 672                 for {
 673                         if state.NotAlive() {
 674                                 return
 675                         }
 676                         state.ctx.LogD("sp-recv", sds, "waiting for payload")
 677                         conn.SetReadDeadline(time.Now().Add(DefaultDeadline * time.Second))
 678                         payload, err := state.ReadSP(conn)
 679                         if err != nil {
 680                                 unmarshalErr := err.(*xdr.UnmarshalError)
 681                                 netErr, ok := unmarshalErr.Err.(net.Error)
 682                                 if ok && netErr.Timeout() {
 683                                         continue
 684                                 }
 685                                 if unmarshalErr.ErrorCode == xdr.ErrIO {
 686                                         break
 687                                 }
 688                                 state.ctx.LogE("sp-recv", SdsAdd(sds, SDS{"err": err}), "")
 689                                 break
 690                         }
 691                         state.ctx.LogD(
 692                                 "sp-recv",
 693                                 SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
 694                                 "got payload",
 695                         )
 696                         payload, err = state.csTheir.Decrypt(nil, nil, payload)
 697                         if err != nil {
 698                                 state.ctx.LogE("sp-recv", SdsAdd(sds, SDS{"err": err}), "")
 699                                 break
 700                         }
 701                         state.ctx.LogD(
 702                                 "sp-recv",
 703                                 SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
 704                                 "processing",
 705                         )
 706                         replies, err := state.ProcessSP(payload)
 707                         if err != nil {
 708                                 state.ctx.LogE("sp-recv", SdsAdd(sds, SDS{"err": err}), "")
 709                                 break
 710                         }
 711                         go func() {
 712                                 for _, reply := range replies {
 713                                         state.ctx.LogD(
 714                                                 "sp-recv",
 715                                                 SdsAdd(sds, SDS{"size": strconv.Itoa(len(reply))}),
 716                                                 "queuing reply",
 717                                         )
 718                                         state.payloads <- reply
 719                                 }
 720                         }()
 721                         if state.rxRate > 0 {
 722                                 time.Sleep(time.Second / time.Duration(state.rxRate))
 723                         }
 724                 }
 725         }()
 726
 727         return nil
 728 }
 729
 730 func (state *SPState) Wait() {
 731         state.wg.Wait()
 732         state.dirUnlock()
 733         state.Duration = time.Now().Sub(state.started)
 734         state.RxSpeed = state.RxBytes
 735         state.TxSpeed = state.TxBytes
 736         rxDuration := int64(state.RxLastSeen.Sub(state.started).Seconds())
 737         txDuration := int64(state.TxLastSeen.Sub(state.started).Seconds())
 738         if rxDuration > 0 {
 739                 state.RxSpeed = state.RxBytes / rxDuration
 740         }
 741         if txDuration > 0 {
 742                 state.TxSpeed = state.TxBytes / txDuration
 743         }
 744 }
 745
 746 func (state *SPState) ProcessSP(payload []byte) ([][]byte, error) {
 747         sds := SDS{"node": state.Node.Id, "nice": strconv.Itoa(int(state.nice))}
 748         r := bytes.NewReader(payload)
 749         var err error
 750         var replies [][]byte
 751         var infosGot bool
 752         for r.Len() > 0 {
 753                 state.ctx.LogD("sp-process", sds, "unmarshaling header")
 754                 var head SPHead
 755                 if _, err = xdr.Unmarshal(r, &head); err != nil {
 756                         state.ctx.LogE("sp-process", SdsAdd(sds, SDS{"err": err}), "")
 757                         return nil, err
 758                 }
 759                 switch head.Type {
 760                 case SPTypeInfo:
 761                         infosGot = true
 762                         sdsp := SdsAdd(sds, SDS{"type": "info"})
 763                         state.ctx.LogD("sp-process", sdsp, "unmarshaling packet")
 764                         var info SPInfo
 765                         if _, err = xdr.Unmarshal(r, &info); err != nil {
 766                                 state.ctx.LogE("sp-process", SdsAdd(sdsp, SDS{"err": err}), "")
 767                                 return nil, err
 768                         }
 769                         sdsp = SdsAdd(sds, SDS{
 770                                 "hash": ToBase32(info.Hash[:]),
 771                                 "size": strconv.FormatInt(int64(info.Size), 10),
 772                         })
 773                         if info.Nice > state.nice {
 774                                 state.ctx.LogD("sp-process", sdsp, "too nice")
 775                                 continue
 776                         }
 777                         state.ctx.LogD("sp-process", sdsp, "received")
 778                         if state.xxOnly == TTx {
 779                                 continue
 780                         }
 781                         state.Lock()
 782                         state.infosTheir[*info.Hash] = &info
 783                         state.Unlock()
 784                         state.ctx.LogD("sp-process", sdsp, "stating part")
 785                         pktPath := filepath.Join(
 786                                 state.ctx.Spool,
 787                                 state.Node.Id.String(),
 788                                 string(TRx),
 789                                 ToBase32(info.Hash[:]),
 790                         )
 791                         if _, err = os.Stat(pktPath); err == nil {
 792                                 state.ctx.LogD("sp-process", sdsp, "already done")
 793                                 replies = append(replies, MarshalSP(SPTypeDone, SPDone{info.Hash}))
 794                                 continue
 795                         }
 796                         if _, err = os.Stat(pktPath + SeenSuffix); err == nil {
 797                                 state.ctx.LogD("sp-process", sdsp, "already seen")
 798                                 replies = append(replies, MarshalSP(SPTypeDone, SPDone{info.Hash}))
 799                                 continue
 800                         }
 801                         fi, err := os.Stat(pktPath + PartSuffix)
 802                         var offset int64
 803                         if err == nil {
 804                                 offset = fi.Size()
 805                                 state.ctx.LogD(
 806                                         "sp-process",
 807                                         SdsAdd(sdsp, SDS{"offset": strconv.FormatInt(offset, 10)}),
 808                                         "part exists",
 809                                 )
 810                         }
 811                         replies = append(replies, MarshalSP(
 812                                 SPTypeFreq,
 813                                 SPFreq{info.Hash, uint64(offset)},
 814                         ))
 815                 case SPTypeFile:
 816                         state.ctx.LogD(
 817                                 "sp-process",
 818                                 SdsAdd(sds, SDS{"type": "file"}),
 819                                 "unmarshaling packet",
 820                         )
 821                         var file SPFile
 822                         if _, err = xdr.Unmarshal(r, &file); err != nil {
 823                                 state.ctx.LogE("sp-process", SdsAdd(sds, SDS{
 824                                         "err":  err,
 825                                         "type": "file",
 826                                 }), "")
 827                                 return nil, err
 828                         }
 829                         sdsp := SdsAdd(sds, SDS{
 830                                 "xx":   string(TRx),
 831                                 "hash": ToBase32(file.Hash[:]),
 832                                 "size": strconv.Itoa(len(file.Payload)),
 833                         })
 834                         filePath := filepath.Join(
 835                                 state.ctx.Spool,
 836                                 state.Node.Id.String(),
 837                                 string(TRx),
 838                                 ToBase32(file.Hash[:]),
 839                         )
 840                         state.ctx.LogD("sp-file", sdsp, "opening part")
 841                         fd, err := os.OpenFile(
 842                                 filePath+PartSuffix,
 843                                 os.O_RDWR|os.O_CREATE,
 844                                 os.FileMode(0600),
 845                         )
 846                         if err != nil {
 847                                 state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
 848                                 return nil, err
 849                         }
 850                         state.ctx.LogD(
 851                                 "sp-file",
 852                                 SdsAdd(sdsp, SDS{"offset": strconv.FormatInt(int64(file.Offset), 10)}),
 853                                 "seeking",
 854                         )
 855                         if _, err = fd.Seek(int64(file.Offset), 0); err != nil {
 856                                 state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
 857                                 fd.Close()
 858                                 return nil, err
 859                         }
 860                         state.ctx.LogD("sp-file", sdsp, "writing")
 861                         _, err = fd.Write(file.Payload)
 862                         if err != nil {
 863                                 state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
 864                                 fd.Close()
 865                                 return nil, err
 866                         }
 867                         ourSize := uint64(file.Offset) + uint64(len(file.Payload))
 868                         state.RLock()
 869                         sdsp["fullsize"] = strconv.FormatInt(int64(state.infosTheir[*file.Hash].Size), 10)
 870                         sdsp["size"] = strconv.FormatInt(int64(ourSize), 10)
 871                         state.ctx.LogP("sp-file", sdsp, "")
 872                         if state.infosTheir[*file.Hash].Size != ourSize {
 873                                 state.RUnlock()
 874                                 fd.Close()
 875                                 continue
 876                         }
 877                         state.RUnlock()
 878                         spWorkersGroup.Wait()
 879                         spWorkersGroup.Add(1)
 880                         go func() {
 881                                 if err := fd.Sync(); err != nil {
 882                                         state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "sync")
 883                                         fd.Close()
 884                                         return
 885                                 }
 886                                 state.wg.Add(1)
 887                                 defer state.wg.Done()
 888                                 fd.Seek(0, 0)
 889                                 state.ctx.LogD("sp-file", sdsp, "checking")
 890                                 gut, err := Check(fd, file.Hash[:])
 891                                 fd.Close()
 892                                 if err != nil || !gut {
 893                                         state.ctx.LogE("sp-file", sdsp, "checksum mismatch")
 894                                         return
 895                                 }
 896                                 state.ctx.LogI("sp-done", SdsAdd(sdsp, SDS{"xx": string(TRx)}), "")
 897                                 os.Rename(filePath+PartSuffix, filePath)
 898                                 state.Lock()
 899                                 delete(state.infosTheir, *file.Hash)
 900                                 state.Unlock()
 901                                 spWorkersGroup.Done()
 902                                 go func() {
 903                                         state.payloads <- MarshalSP(SPTypeDone, SPDone{file.Hash})
 904                                 }()
 905                         }()
 906                 case SPTypeDone:
 907                         state.ctx.LogD(
 908                                 "sp-process",
 909                                 SdsAdd(sds, SDS{"type": "done"}),
 910                                 "unmarshaling packet",
 911                         )
 912                         var done SPDone
 913                         if _, err = xdr.Unmarshal(r, &done); err != nil {
 914                                 state.ctx.LogE("sp-process", SdsAdd(sds, SDS{
 915                                         "type": "done",
 916                                         "err":  err,
 917                                 }), "")
 918                                 return nil, err
 919                         }
 920                         sdsp := SdsAdd(sds, SDS{"hash": ToBase32(done.Hash[:])})
 921                         state.ctx.LogD("sp-done", sdsp, "removing")
 922                         err := os.Remove(filepath.Join(
 923                                 state.ctx.Spool,
 924                                 state.Node.Id.String(),
 925                                 string(TTx),
 926                                 ToBase32(done.Hash[:]),
 927                         ))
 928                         if err == nil {
 929                                 state.ctx.LogI("sp-done", SdsAdd(sdsp, SDS{"xx": string(TTx)}), "")
 930                         } else {
 931                                 state.ctx.LogE("sp-done", SdsAdd(sdsp, SDS{"xx": string(TTx)}), "")
 932                         }
 933                 case SPTypeFreq:
 934                         sdsp := SdsAdd(sds, SDS{"type": "freq"})
 935                         state.ctx.LogD("sp-process", sdsp, "unmarshaling packet")
 936                         var freq SPFreq
 937                         if _, err = xdr.Unmarshal(r, &freq); err != nil {
 938                                 state.ctx.LogE("sp-process", SdsAdd(sdsp, SDS{"err": err}), "")
 939                                 return nil, err
 940                         }
 941                         state.ctx.LogD("sp-process", SdsAdd(sdsp, SDS{
 942                                 "hash":   ToBase32(freq.Hash[:]),
 943                                 "offset": strconv.FormatInt(int64(freq.Offset), 10),
 944                         }), "queueing")
 945                         nice, exists := state.infosOurSeen[*freq.Hash]
 946                         if exists {
 947                                 state.Lock()
 948                                 insertIdx := 0
 949                                 var freqWithNice *FreqWithNice
 950                                 for insertIdx, freqWithNice = range state.queueTheir {
 951                                         if freqWithNice.nice > nice {
 952                                                 break
 953                                         }
 954                                 }
 955                                 state.queueTheir = append(state.queueTheir, nil)
 956                                 copy(state.queueTheir[insertIdx+1:], state.queueTheir[insertIdx:])
 957                                 state.queueTheir[insertIdx] = &FreqWithNice{&freq, nice}
 958                                 state.Unlock()
 959                         } else {
 960                                 state.ctx.LogD("sp-process", SdsAdd(sdsp, SDS{
 961                                         "hash":   ToBase32(freq.Hash[:]),
 962                                         "offset": strconv.FormatInt(int64(freq.Offset), 10),
 963                                 }), "unknown")
 964                         }
 965                 case SPTypeHalt:
 966                         sdsp := SdsAdd(sds, SDS{"type": "halt"})
 967                         state.ctx.LogD("sp-process", sdsp, "")
 968                         state.Lock()
 969                         state.queueTheir = nil
 970                         state.Unlock()
 971                 default:
 972                         state.ctx.LogE(
 973                                 "sp-process",
 974                                 SdsAdd(sds, SDS{"type": head.Type}),
 975                                 "unknown",
 976                         )
 977                         return nil, BadPktType
 978                 }
 979         }
 980         if infosGot {
 981                 var pkts int
 982                 var size uint64
 983                 state.RLock()
 984                 for _, info := range state.infosTheir {
 985                         pkts++
 986                         size += info.Size
 987                 }
 988                 state.RUnlock()
 989                 state.ctx.LogI("sp-infos", SDS{
 990                         "xx":   string(TRx),
 991                         "node": state.Node.Id,
 992                         "pkts": strconv.Itoa(pkts),
 993                         "size": strconv.FormatInt(int64(size), 10),
 994                 }, "")
 995         }
 996         return payloadsSplit(replies), nil
 997 }