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