src/cypherpunks.ru/nncp/sp.go

   1 /*
   2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
   3 Copyright (C) 2016-2017 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
  60 type SPType uint8
  61
  62 const (
  63         SPTypeInfo SPType = iota
  64         SPTypeFreq SPType = iota
  65         SPTypeFile SPType = iota
  66         SPTypeDone SPType = iota
  67         SPTypeHalt SPType = iota
  68 )
  69
  70 type SPHead struct {
  71         Type SPType
  72 }
  73
  74 type SPInfo struct {
  75         Nice uint8
  76         Size uint64
  77         Hash *[32]byte
  78 }
  79
  80 type SPFreq struct {
  81         Hash   *[32]byte
  82         Offset uint64
  83 }
  84
  85 type SPFile struct {
  86         Hash    *[32]byte
  87         Offset  uint64
  88         Payload []byte
  89 }
  90
  91 type SPDone struct {
  92         Hash *[32]byte
  93 }
  94
  95 type SPRaw struct {
  96         Magic   [8]byte
  97         Payload []byte
  98 }
  99
 100 func init() {
 101         var buf bytes.Buffer
 102         spHead := SPHead{Type: SPTypeHalt}
 103         if _, err := xdr.Marshal(&buf, spHead); err != nil {
 104                 panic(err)
 105         }
 106         copy(SPHaltMarshalized, buf.Bytes())
 107         SPHeadOverhead = buf.Len()
 108         buf.Reset()
 109
 110         spInfo := SPInfo{Nice: 123, Size: 123, Hash: new([32]byte)}
 111         if _, err := xdr.Marshal(&buf, spInfo); err != nil {
 112                 panic(err)
 113         }
 114         SPInfoOverhead = buf.Len()
 115         buf.Reset()
 116
 117         spFreq := SPFreq{Hash: new([32]byte), Offset: 123}
 118         if _, err := xdr.Marshal(&buf, spFreq); err != nil {
 119                 panic(err)
 120         }
 121         SPFreqOverhead = buf.Len()
 122         buf.Reset()
 123
 124         spFile := SPFile{Hash: new([32]byte), Offset: 123}
 125         if _, err := xdr.Marshal(&buf, spFile); err != nil {
 126                 panic(err)
 127         }
 128         SPFileOverhead = buf.Len()
 129 }
 130
 131 func MarshalSP(typ SPType, sp interface{}) []byte {
 132         var buf bytes.Buffer
 133         var err error
 134         if _, err = xdr.Marshal(&buf, SPHead{typ}); err != nil {
 135                 panic(err)
 136         }
 137         if _, err = xdr.Marshal(&buf, sp); err != nil {
 138                 panic(err)
 139         }
 140         return buf.Bytes()
 141 }
 142
 143 func payloadsSplit(payloads [][]byte) [][]byte {
 144         var outbounds [][]byte
 145         outbound := make([]byte, 0, MaxSPSize)
 146         for i, payload := range payloads {
 147                 outbound = append(outbound, payload...)
 148                 if i+1 < len(payloads) && len(outbound)+len(payloads[i+1]) > MaxSPSize {
 149                         outbounds = append(outbounds, outbound)
 150                         outbound = make([]byte, 0, MaxSPSize)
 151                 }
 152         }
 153         if len(outbound) > 0 {
 154                 outbounds = append(outbounds, outbound)
 155         }
 156         return outbounds
 157 }
 158
 159 type SPState struct {
 160         ctx            *Ctx
 161         Node           *Node
 162         onlineDeadline uint
 163         maxOnlineTime  uint
 164         nice           uint8
 165         hs             *noise.HandshakeState
 166         csOur          *noise.CipherState
 167         csTheir        *noise.CipherState
 168         payloads       chan []byte
 169         infosTheir     map[[32]byte]*SPInfo
 170         infosOurSeen   map[[32]byte]struct{}
 171         queueTheir     []*SPFreq
 172         wg             sync.WaitGroup
 173         RxBytes        int64
 174         RxLastSeen     time.Time
 175         TxBytes        int64
 176         TxLastSeen     time.Time
 177         started        time.Time
 178         Duration       time.Duration
 179         RxSpeed        int64
 180         TxSpeed        int64
 181         rxLock         *os.File
 182         txLock         *os.File
 183         xxOnly         *TRxTx
 184         isDead         bool
 185         sync.RWMutex
 186 }
 187
 188 func (state *SPState) NotAlive() bool {
 189         if state.isDead {
 190                 return true
 191         }
 192         now := time.Now()
 193         if state.maxOnlineTime > 0 && state.started.Add(time.Duration(state.maxOnlineTime)*time.Second).Before(now) {
 194                 return true
 195         }
 196         return uint(now.Sub(state.RxLastSeen).Seconds()) >= state.onlineDeadline && uint(now.Sub(state.TxLastSeen).Seconds()) >= state.onlineDeadline
 197 }
 198
 199 func (state *SPState) dirUnlock() {
 200         state.ctx.UnlockDir(state.rxLock)
 201         state.ctx.UnlockDir(state.txLock)
 202 }
 203
 204 func (state *SPState) WriteSP(dst io.Writer, payload []byte) error {
 205         n, err := xdr.Marshal(dst, SPRaw{Magic: MagicNNCPLv1, Payload: payload})
 206         if err == nil {
 207                 state.TxLastSeen = time.Now()
 208                 state.TxBytes += int64(n)
 209         }
 210         return err
 211 }
 212
 213 func (state *SPState) ReadSP(src io.Reader) ([]byte, error) {
 214         var sp SPRaw
 215         n, err := xdr.UnmarshalLimited(src, &sp, 1<<17)
 216         if err != nil {
 217                 return nil, err
 218         }
 219         state.RxLastSeen = time.Now()
 220         state.RxBytes += int64(n)
 221         if sp.Magic != MagicNNCPLv1 {
 222                 return nil, BadMagic
 223         }
 224         return sp.Payload, nil
 225 }
 226
 227 func (ctx *Ctx) infosOur(nodeId *NodeId, nice uint8, seen *map[[32]byte]struct{}) [][]byte {
 228         var infos []*SPInfo
 229         var totalSize int64
 230         for job := range ctx.Jobs(nodeId, TTx) {
 231                 job.Fd.Close()
 232                 if job.PktEnc.Nice > nice {
 233                         continue
 234                 }
 235                 if _, known := (*seen)[*job.HshValue]; known {
 236                         continue
 237                 }
 238                 totalSize += job.Size
 239                 infos = append(infos, &SPInfo{
 240                         Nice: job.PktEnc.Nice,
 241                         Size: uint64(job.Size),
 242                         Hash: job.HshValue,
 243                 })
 244                 (*seen)[*job.HshValue] = struct{}{}
 245         }
 246         sort.Sort(ByNice(infos))
 247         var payloads [][]byte
 248         for _, info := range infos {
 249                 payloads = append(payloads, MarshalSP(SPTypeInfo, info))
 250                 ctx.LogD("sp-info-our", SDS{
 251                         "node": nodeId,
 252                         "name": ToBase32(info.Hash[:]),
 253                         "size": strconv.FormatInt(int64(info.Size), 10),
 254                 }, "")
 255         }
 256         if totalSize > 0 {
 257                 ctx.LogI("sp-infos", SDS{
 258                         "xx":   string(TTx),
 259                         "node": nodeId,
 260                         "pkts": strconv.Itoa(len(payloads)),
 261                         "size": strconv.FormatInt(totalSize, 10),
 262                 }, "")
 263         }
 264         return payloadsSplit(payloads)
 265 }
 266
 267 func (ctx *Ctx) StartI(conn net.Conn, nodeId *NodeId, nice uint8, xxOnly *TRxTx, onlineDeadline, maxOnlineTime uint) (*SPState, error) {
 268         err := ctx.ensureRxDir(nodeId)
 269         if err != nil {
 270                 return nil, err
 271         }
 272         var rxLock *os.File
 273         if xxOnly != nil && *xxOnly == TRx {
 274                 rxLock, err = ctx.LockDir(nodeId, TRx)
 275                 if err != nil {
 276                         return nil, err
 277                 }
 278         }
 279         var txLock *os.File
 280         if xxOnly != nil && *xxOnly == TTx {
 281                 txLock, err = ctx.LockDir(nodeId, TTx)
 282                 if err != nil {
 283                         return nil, err
 284                 }
 285         }
 286         started := time.Now()
 287         node := ctx.Neigh[*nodeId]
 288         conf := noise.Config{
 289                 CipherSuite: NoiseCipherSuite,
 290                 Pattern:     noise.HandshakeIK,
 291                 Initiator:   true,
 292                 StaticKeypair: noise.DHKey{
 293                         Private: ctx.Self.NoisePrv[:],
 294                         Public:  ctx.Self.NoisePub[:],
 295                 },
 296                 PeerStatic: node.NoisePub[:],
 297         }
 298         state := SPState{
 299                 ctx:            ctx,
 300                 hs:             noise.NewHandshakeState(conf),
 301                 Node:           node,
 302                 onlineDeadline: onlineDeadline,
 303                 maxOnlineTime:  maxOnlineTime,
 304                 nice:           nice,
 305                 payloads:       make(chan []byte),
 306                 infosTheir:     make(map[[32]byte]*SPInfo),
 307                 infosOurSeen:   make(map[[32]byte]struct{}),
 308                 started:        started,
 309                 rxLock:         rxLock,
 310                 txLock:         txLock,
 311                 xxOnly:         xxOnly,
 312         }
 313
 314         var infosPayloads [][]byte
 315         if xxOnly == nil || *xxOnly != TTx {
 316                 infosPayloads = ctx.infosOur(nodeId, nice, &state.infosOurSeen)
 317         }
 318         var firstPayload []byte
 319         if len(infosPayloads) > 0 {
 320                 firstPayload = infosPayloads[0]
 321         }
 322         // Pad first payload, to hide actual number of existing files
 323         for i := 0; i < (MaxSPSize-len(firstPayload))/SPHeadOverhead; i++ {
 324                 firstPayload = append(firstPayload, SPHaltMarshalized...)
 325         }
 326
 327         var buf []byte
 328         var payload []byte
 329         buf, _, _ = state.hs.WriteMessage(nil, firstPayload)
 330         sds := SDS{"node": nodeId, "nice": strconv.Itoa(int(nice))}
 331         ctx.LogD("sp-start", sds, "sending first message")
 332         conn.SetWriteDeadline(time.Now().Add(DefaultDeadline * time.Second))
 333         if err = state.WriteSP(conn, buf); err != nil {
 334                 ctx.LogE("sp-start", SdsAdd(sds, SDS{"err": err}), "")
 335                 state.dirUnlock()
 336                 return nil, err
 337         }
 338         ctx.LogD("sp-start", sds, "waiting for first message")
 339         conn.SetReadDeadline(time.Now().Add(DefaultDeadline * time.Second))
 340         if buf, err = state.ReadSP(conn); err != nil {
 341                 ctx.LogE("sp-start", SdsAdd(sds, SDS{"err": err}), "")
 342                 state.dirUnlock()
 343                 return nil, err
 344         }
 345         payload, state.csOur, state.csTheir, err = state.hs.ReadMessage(nil, buf)
 346         if err != nil {
 347                 ctx.LogE("sp-start", SdsAdd(sds, SDS{"err": err}), "")
 348                 state.dirUnlock()
 349                 return nil, err
 350         }
 351         ctx.LogD("sp-start", sds, "starting workers")
 352         err = state.StartWorkers(conn, infosPayloads, payload)
 353         if err != nil {
 354                 ctx.LogE("sp-start", SdsAdd(sds, SDS{"err": err}), "")
 355                 state.dirUnlock()
 356                 return nil, err
 357         }
 358         return &state, err
 359 }
 360
 361 func (ctx *Ctx) StartR(conn net.Conn, nice uint8, xxOnly *TRxTx) (*SPState, error) {
 362         started := time.Now()
 363         conf := noise.Config{
 364                 CipherSuite: NoiseCipherSuite,
 365                 Pattern:     noise.HandshakeIK,
 366                 Initiator:   false,
 367                 StaticKeypair: noise.DHKey{
 368                         Private: ctx.Self.NoisePrv[:],
 369                         Public:  ctx.Self.NoisePub[:],
 370                 },
 371         }
 372         state := SPState{
 373                 ctx:          ctx,
 374                 hs:           noise.NewHandshakeState(conf),
 375                 nice:         nice,
 376                 payloads:     make(chan []byte),
 377                 infosOurSeen: make(map[[32]byte]struct{}),
 378                 infosTheir:   make(map[[32]byte]*SPInfo),
 379                 started:      started,
 380                 xxOnly:       xxOnly,
 381         }
 382         var buf []byte
 383         var payload []byte
 384         var err error
 385         ctx.LogD(
 386                 "sp-start",
 387                 SDS{"nice": strconv.Itoa(int(nice))},
 388                 "waiting for first message",
 389         )
 390         conn.SetReadDeadline(time.Now().Add(DefaultDeadline * time.Second))
 391         if buf, err = state.ReadSP(conn); err != nil {
 392                 ctx.LogE("sp-start", SDS{"err": err}, "")
 393                 return nil, err
 394         }
 395         if payload, _, _, err = state.hs.ReadMessage(nil, buf); err != nil {
 396                 ctx.LogE("sp-start", SDS{"err": err}, "")
 397                 return nil, err
 398         }
 399
 400         var node *Node
 401         for _, node = range ctx.Neigh {
 402                 if subtle.ConstantTimeCompare(state.hs.PeerStatic(), node.NoisePub[:]) == 1 {
 403                         break
 404                 }
 405         }
 406         if node == nil {
 407                 peerId := ToBase32(state.hs.PeerStatic())
 408                 ctx.LogE("sp-start", SDS{"peer": peerId}, "unknown")
 409                 return nil, errors.New("Unknown peer: " + peerId)
 410         }
 411         state.Node = node
 412         state.onlineDeadline = node.OnlineDeadline
 413         state.maxOnlineTime = node.MaxOnlineTime
 414         sds := SDS{"node": node.Id, "nice": strconv.Itoa(int(nice))}
 415
 416         if ctx.ensureRxDir(node.Id); err != nil {
 417                 return nil, err
 418         }
 419         var rxLock *os.File
 420         if xxOnly != nil && *xxOnly == TRx {
 421                 rxLock, err = ctx.LockDir(node.Id, TRx)
 422                 if err != nil {
 423                         return nil, err
 424                 }
 425         }
 426         state.rxLock = rxLock
 427         var txLock *os.File
 428         if xxOnly != nil && *xxOnly == TTx {
 429                 txLock, err = ctx.LockDir(node.Id, TTx)
 430                 if err != nil {
 431                         return nil, err
 432                 }
 433         }
 434         state.txLock = txLock
 435
 436         var infosPayloads [][]byte
 437         if xxOnly == nil || *xxOnly != TTx {
 438                 infosPayloads = ctx.infosOur(node.Id, nice, &state.infosOurSeen)
 439         }
 440         var firstPayload []byte
 441         if len(infosPayloads) > 0 {
 442                 firstPayload = infosPayloads[0]
 443         }
 444         // Pad first payload, to hide actual number of existing files
 445         for i := 0; i < (MaxSPSize-len(firstPayload))/SPHeadOverhead; i++ {
 446                 firstPayload = append(firstPayload, SPHaltMarshalized...)
 447         }
 448
 449         ctx.LogD("sp-start", sds, "sending first message")
 450         buf, state.csTheir, state.csOur = state.hs.WriteMessage(nil, firstPayload)
 451         conn.SetWriteDeadline(time.Now().Add(DefaultDeadline * time.Second))
 452         if err = state.WriteSP(conn, buf); err != nil {
 453                 ctx.LogE("sp-start", SdsAdd(sds, SDS{"err": err}), "")
 454                 state.dirUnlock()
 455                 return nil, err
 456         }
 457         ctx.LogD("sp-start", sds, "starting workers")
 458         err = state.StartWorkers(conn, infosPayloads, payload)
 459         if err != nil {
 460                 state.dirUnlock()
 461                 return nil, err
 462         }
 463         return &state, err
 464 }
 465
 466 func (state *SPState) StartWorkers(conn net.Conn, infosPayloads [][]byte, payload []byte) error {
 467         sds := SDS{"node": state.Node.Id, "nice": strconv.Itoa(int(state.nice))}
 468         if len(infosPayloads) > 1 {
 469                 go func() {
 470                         for _, payload := range infosPayloads[1:] {
 471                                 state.ctx.LogD(
 472                                         "sp-work",
 473                                         SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
 474                                         "queuing remaining payload",
 475                                 )
 476                                 state.payloads <- payload
 477                         }
 478                 }()
 479         }
 480         state.ctx.LogD(
 481                 "sp-work",
 482                 SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
 483                 "processing first payload",
 484         )
 485         replies, err := state.ProcessSP(payload)
 486         if err != nil {
 487                 state.ctx.LogE("sp-work", SdsAdd(sds, SDS{"err": err}), "")
 488                 return err
 489         }
 490
 491         go func() {
 492                 for _, reply := range replies {
 493                         state.ctx.LogD(
 494                                 "sp-work",
 495                                 SdsAdd(sds, SDS{"size": strconv.Itoa(len(reply))}),
 496                                 "queuing reply",
 497                         )
 498                         state.payloads <- reply
 499                 }
 500         }()
 501
 502         go func() {
 503                 for range time.Tick(time.Second) {
 504                         for _, payload := range state.ctx.infosOur(
 505                                 state.Node.Id,
 506                                 state.nice,
 507                                 &state.infosOurSeen,
 508                         ) {
 509                                 state.ctx.LogD(
 510                                         "sp-work",
 511                                         SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
 512                                         "queuing new info",
 513                                 )
 514                                 state.payloads <- payload
 515                         }
 516                 }
 517         }()
 518
 519         state.wg.Add(1)
 520         go func() {
 521                 defer func() {
 522                         state.isDead = true
 523                         state.wg.Done()
 524                 }()
 525                 for {
 526                         if state.NotAlive() {
 527                                 return
 528                         }
 529                         var payload []byte
 530                         select {
 531                         case payload = <-state.payloads:
 532                                 state.ctx.LogD(
 533                                         "sp-xmit",
 534                                         SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
 535                                         "got payload",
 536                                 )
 537                         default:
 538                         }
 539                         if payload == nil {
 540                                 state.RLock()
 541                                 if len(state.queueTheir) == 0 {
 542                                         state.ctx.LogD("sp-xmit", sds, "file queue is empty")
 543                                         state.RUnlock()
 544                                         time.Sleep(100 * time.Millisecond)
 545                                         continue
 546                                 }
 547                                 freq := state.queueTheir[0]
 548                                 state.RUnlock()
 549                                 sdsp := SdsAdd(sds, SDS{
 550                                         "xx":   string(TTx),
 551                                         "hash": ToBase32(freq.Hash[:]),
 552                                         "size": strconv.FormatInt(int64(freq.Offset), 10),
 553                                 })
 554                                 state.ctx.LogD("sp-file", sdsp, "queueing")
 555                                 fd, err := os.Open(filepath.Join(
 556                                         state.ctx.Spool,
 557                                         state.Node.Id.String(),
 558                                         string(TTx),
 559                                         ToBase32(freq.Hash[:]),
 560                                 ))
 561                                 if err != nil {
 562                                         state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
 563                                         break
 564                                 }
 565                                 fi, err := fd.Stat()
 566                                 if err != nil {
 567                                         state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
 568                                         break
 569                                 }
 570                                 fullSize := uint64(fi.Size())
 571                                 var buf []byte
 572                                 if freq.Offset < fullSize {
 573                                         state.ctx.LogD("sp-file", sdsp, "seeking")
 574                                         if _, err = fd.Seek(int64(freq.Offset), 0); err != nil {
 575                                                 state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
 576                                                 break
 577                                         }
 578                                         buf = make([]byte, MaxSPSize-SPHeadOverhead-SPFileOverhead)
 579                                         n, err := fd.Read(buf)
 580                                         if err != nil {
 581                                                 state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
 582                                                 break
 583                                         }
 584                                         buf = buf[:n]
 585                                         state.ctx.LogD(
 586                                                 "sp-file",
 587                                                 SdsAdd(sdsp, SDS{"size": strconv.Itoa(n)}),
 588                                                 "read",
 589                                         )
 590                                 }
 591                                 fd.Close()
 592                                 payload = MarshalSP(SPTypeFile, SPFile{
 593                                         Hash:    freq.Hash,
 594                                         Offset:  freq.Offset,
 595                                         Payload: buf,
 596                                 })
 597                                 ourSize := freq.Offset + uint64(len(buf))
 598                                 sdsp["size"] = strconv.FormatInt(int64(ourSize), 10)
 599                                 sdsp["fullsize"] = strconv.FormatInt(int64(fullSize), 10)
 600                                 state.ctx.LogP("sp-file", sdsp, "")
 601                                 state.Lock()
 602                                 if len(state.queueTheir) > 0 && *state.queueTheir[0].Hash == *freq.Hash {
 603                                         if ourSize == fullSize {
 604                                                 state.ctx.LogD("sp-file", sdsp, "finished")
 605                                                 if len(state.queueTheir) > 1 {
 606                                                         state.queueTheir = state.queueTheir[1:]
 607                                                 } else {
 608                                                         state.queueTheir = state.queueTheir[:0]
 609                                                 }
 610                                         } else {
 611                                                 state.queueTheir[0].Offset += uint64(len(buf))
 612                                         }
 613                                 } else {
 614                                         state.ctx.LogD("sp-file", sdsp, "queue disappeared")
 615                                 }
 616                                 state.Unlock()
 617                         }
 618                         state.ctx.LogD(
 619                                 "sp-xmit",
 620                                 SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
 621                                 "sending",
 622                         )
 623                         conn.SetWriteDeadline(time.Now().Add(10 * time.Second))
 624                         if err := state.WriteSP(conn, state.csOur.Encrypt(nil, nil, payload)); err != nil {
 625                                 state.ctx.LogE("sp-xmit", SdsAdd(sds, SDS{"err": err}), "")
 626                                 break
 627                         }
 628                 }
 629         }()
 630
 631         state.wg.Add(1)
 632         go func() {
 633                 defer func() {
 634                         state.isDead = true
 635                         state.wg.Done()
 636                 }()
 637                 for {
 638                         if state.NotAlive() {
 639                                 return
 640                         }
 641                         state.ctx.LogD("sp-recv", sds, "waiting for payload")
 642                         conn.SetReadDeadline(time.Now().Add(DefaultDeadline * time.Second))
 643                         payload, err := state.ReadSP(conn)
 644                         if err != nil {
 645                                 unmarshalErr := err.(*xdr.UnmarshalError)
 646                                 netErr, ok := unmarshalErr.Err.(net.Error)
 647                                 if ok && netErr.Timeout() {
 648                                         continue
 649                                 }
 650                                 if unmarshalErr.ErrorCode == xdr.ErrIO {
 651                                         break
 652                                 }
 653                                 state.ctx.LogE("sp-recv", SdsAdd(sds, SDS{"err": err}), "")
 654                                 break
 655                         }
 656                         state.ctx.LogD(
 657                                 "sp-recv",
 658                                 SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
 659                                 "got payload",
 660                         )
 661                         payload, err = state.csTheir.Decrypt(nil, nil, payload)
 662                         if err != nil {
 663                                 state.ctx.LogE("sp-recv", SdsAdd(sds, SDS{"err": err}), "")
 664                                 break
 665                         }
 666                         state.ctx.LogD(
 667                                 "sp-recv",
 668                                 SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
 669                                 "processing",
 670                         )
 671                         replies, err := state.ProcessSP(payload)
 672                         if err != nil {
 673                                 state.ctx.LogE("sp-recv", SdsAdd(sds, SDS{"err": err}), "")
 674                                 break
 675                         }
 676                         go func() {
 677                                 for _, reply := range replies {
 678                                         state.ctx.LogD(
 679                                                 "sp-recv",
 680                                                 SdsAdd(sds, SDS{"size": strconv.Itoa(len(reply))}),
 681                                                 "queuing reply",
 682                                         )
 683                                         state.payloads <- reply
 684                                 }
 685                         }()
 686                 }
 687         }()
 688
 689         return nil
 690 }
 691
 692 func (state *SPState) Wait() {
 693         state.wg.Wait()
 694         state.dirUnlock()
 695         state.Duration = time.Now().Sub(state.started)
 696         state.RxSpeed = state.RxBytes
 697         state.TxSpeed = state.TxBytes
 698         rxDuration := int64(state.RxLastSeen.Sub(state.started).Seconds())
 699         txDuration := int64(state.TxLastSeen.Sub(state.started).Seconds())
 700         if rxDuration > 0 {
 701                 state.RxSpeed = state.RxBytes / rxDuration
 702         }
 703         if txDuration > 0 {
 704                 state.TxSpeed = state.TxBytes / txDuration
 705         }
 706 }
 707
 708 func (state *SPState) ProcessSP(payload []byte) ([][]byte, error) {
 709         sds := SDS{"node": state.Node.Id, "nice": strconv.Itoa(int(state.nice))}
 710         r := bytes.NewReader(payload)
 711         var err error
 712         var replies [][]byte
 713         var infosGot bool
 714         for r.Len() > 0 {
 715                 state.ctx.LogD("sp-process", sds, "unmarshaling header")
 716                 var head SPHead
 717                 if _, err = xdr.Unmarshal(r, &head); err != nil {
 718                         state.ctx.LogE("sp-process", SdsAdd(sds, SDS{"err": err}), "")
 719                         return nil, err
 720                 }
 721                 switch head.Type {
 722                 case SPTypeInfo:
 723                         infosGot = true
 724                         sdsp := SdsAdd(sds, SDS{"type": "info"})
 725                         state.ctx.LogD("sp-process", sdsp, "unmarshaling packet")
 726                         var info SPInfo
 727                         if _, err = xdr.Unmarshal(r, &info); err != nil {
 728                                 state.ctx.LogE("sp-process", SdsAdd(sdsp, SDS{"err": err}), "")
 729                                 return nil, err
 730                         }
 731                         sdsp = SdsAdd(sds, SDS{
 732                                 "hash": ToBase32(info.Hash[:]),
 733                                 "size": strconv.FormatInt(int64(info.Size), 10),
 734                         })
 735                         if info.Nice > state.nice {
 736                                 state.ctx.LogD("sp-process", sdsp, "too nice")
 737                                 continue
 738                         }
 739                         state.ctx.LogD("sp-process", sdsp, "received")
 740                         if state.xxOnly != nil && *state.xxOnly == TTx {
 741                                 continue
 742                         }
 743                         state.Lock()
 744                         state.infosTheir[*info.Hash] = &info
 745                         state.Unlock()
 746                         state.ctx.LogD("sp-process", sdsp, "stating part")
 747                         if _, err = os.Stat(filepath.Join(
 748                                 state.ctx.Spool,
 749                                 state.Node.Id.String(),
 750                                 string(TRx),
 751                                 ToBase32(info.Hash[:]),
 752                         )); err == nil {
 753                                 state.ctx.LogD("sp-process", sdsp, "already done")
 754                                 replies = append(replies, MarshalSP(SPTypeDone, SPDone{info.Hash}))
 755                                 continue
 756                         }
 757                         fi, err := os.Stat(filepath.Join(
 758                                 state.ctx.Spool,
 759                                 state.Node.Id.String(),
 760                                 string(TRx),
 761                                 ToBase32(info.Hash[:])+PartSuffix,
 762                         ))
 763                         var offset int64
 764                         if err == nil {
 765                                 offset = fi.Size()
 766                                 state.ctx.LogD(
 767                                         "sp-process",
 768                                         SdsAdd(sdsp, SDS{"offset": strconv.FormatInt(offset, 10)}),
 769                                         "part exists",
 770                                 )
 771                         }
 772                         replies = append(replies, MarshalSP(
 773                                 SPTypeFreq,
 774                                 SPFreq{info.Hash, uint64(offset)},
 775                         ))
 776                 case SPTypeFile:
 777                         state.ctx.LogD(
 778                                 "sp-process",
 779                                 SdsAdd(sds, SDS{"type": "file"}),
 780                                 "unmarshaling packet",
 781                         )
 782                         var file SPFile
 783                         if _, err = xdr.Unmarshal(r, &file); err != nil {
 784                                 state.ctx.LogE("sp-process", SdsAdd(sds, SDS{
 785                                         "err":  err,
 786                                         "type": "file",
 787                                 }), "")
 788                                 return nil, err
 789                         }
 790                         sdsp := SdsAdd(sds, SDS{
 791                                 "xx":   string(TRx),
 792                                 "hash": ToBase32(file.Hash[:]),
 793                                 "size": strconv.Itoa(len(file.Payload)),
 794                         })
 795                         filePath := filepath.Join(
 796                                 state.ctx.Spool,
 797                                 state.Node.Id.String(),
 798                                 string(TRx),
 799                                 ToBase32(file.Hash[:]),
 800                         )
 801                         state.ctx.LogD("sp-file", sdsp, "opening part")
 802                         fd, err := os.OpenFile(
 803                                 filePath+PartSuffix,
 804                                 os.O_RDWR|os.O_CREATE,
 805                                 os.FileMode(0600),
 806                         )
 807                         if err != nil {
 808                                 state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
 809                                 return nil, err
 810                         }
 811                         state.ctx.LogD(
 812                                 "sp-file",
 813                                 SdsAdd(sdsp, SDS{"offset": strconv.FormatInt(int64(file.Offset), 10)}),
 814                                 "seeking",
 815                         )
 816                         if _, err = fd.Seek(int64(file.Offset), 0); err != nil {
 817                                 state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
 818                                 fd.Close()
 819                                 return nil, err
 820                         }
 821                         state.ctx.LogD("sp-file", sdsp, "writing")
 822                         _, err = fd.Write(file.Payload)
 823                         if err != nil {
 824                                 state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
 825                                 fd.Close()
 826                                 return nil, err
 827                         }
 828                         ourSize := uint64(file.Offset) + uint64(len(file.Payload))
 829                         state.RLock()
 830                         sdsp["fullsize"] = strconv.FormatInt(int64(state.infosTheir[*file.Hash].Size), 10)
 831                         sdsp["size"] = strconv.FormatInt(int64(ourSize), 10)
 832                         state.ctx.LogP("sp-file", sdsp, "")
 833                         if state.infosTheir[*file.Hash].Size != ourSize {
 834                                 state.RUnlock()
 835                                 fd.Close()
 836                                 continue
 837                         }
 838                         state.RUnlock()
 839                         go func() {
 840                                 if err := fd.Sync(); err != nil {
 841                                         state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "sync")
 842                                         fd.Close()
 843                                         return
 844                                 }
 845                                 state.wg.Add(1)
 846                                 defer state.wg.Done()
 847                                 fd.Seek(0, 0)
 848                                 state.ctx.LogD("sp-file", sdsp, "checking")
 849                                 gut, err := Check(fd, file.Hash[:])
 850                                 fd.Close()
 851                                 if err != nil || !gut {
 852                                         state.ctx.LogE("sp-file", sdsp, "checksum mismatch")
 853                                         return
 854                                 }
 855                                 state.ctx.LogI("sp-done", SdsAdd(sdsp, SDS{"xx": string(TRx)}), "")
 856                                 os.Rename(filePath+PartSuffix, filePath)
 857                                 state.Lock()
 858                                 delete(state.infosTheir, *file.Hash)
 859                                 state.Unlock()
 860                                 go func() {
 861                                         state.payloads <- MarshalSP(SPTypeDone, SPDone{file.Hash})
 862                                 }()
 863                         }()
 864                 case SPTypeDone:
 865                         state.ctx.LogD(
 866                                 "sp-process",
 867                                 SdsAdd(sds, SDS{"type": "done"}),
 868                                 "unmarshaling packet",
 869                         )
 870                         var done SPDone
 871                         if _, err = xdr.Unmarshal(r, &done); err != nil {
 872                                 state.ctx.LogE("sp-process", SdsAdd(sds, SDS{
 873                                         "type": "done",
 874                                         "err":  err,
 875                                 }), "")
 876                                 return nil, err
 877                         }
 878                         sdsp := SdsAdd(sds, SDS{"hash": ToBase32(done.Hash[:])})
 879                         state.ctx.LogD("sp-done", sdsp, "removing")
 880                         err := os.Remove(filepath.Join(
 881                                 state.ctx.Spool,
 882                                 state.Node.Id.String(),
 883                                 string(TTx),
 884                                 ToBase32(done.Hash[:]),
 885                         ))
 886                         if err == nil {
 887                                 state.ctx.LogI("sp-done", SdsAdd(sdsp, SDS{"xx": string(TTx)}), "")
 888                         } else {
 889                                 state.ctx.LogE("sp-done", SdsAdd(sdsp, SDS{"xx": string(TTx)}), "")
 890                         }
 891                 case SPTypeFreq:
 892                         sdsp := SdsAdd(sds, SDS{"type": "freq"})
 893                         state.ctx.LogD("sp-process", sdsp, "unmarshaling packet")
 894                         var freq SPFreq
 895                         if _, err = xdr.Unmarshal(r, &freq); err != nil {
 896                                 state.ctx.LogE("sp-process", SdsAdd(sdsp, SDS{"err": err}), "")
 897                                 return nil, err
 898                         }
 899                         state.ctx.LogD("sp-process", SdsAdd(sdsp, SDS{
 900                                 "hash":   ToBase32(freq.Hash[:]),
 901                                 "offset": strconv.FormatInt(int64(freq.Offset), 10),
 902                         }), "queueing")
 903                         state.Lock()
 904                         state.queueTheir = append(state.queueTheir, &freq)
 905                         state.Unlock()
 906                 case SPTypeHalt:
 907                         sdsp := SdsAdd(sds, SDS{"type": "halt"})
 908                         state.ctx.LogD("sp-process", sdsp, "")
 909                         state.Lock()
 910                         state.queueTheir = nil
 911                         state.Unlock()
 912                 default:
 913                         state.ctx.LogE(
 914                                 "sp-process",
 915                                 SdsAdd(sds, SDS{"type": head.Type}),
 916                                 "unknown",
 917                         )
 918                         return nil, BadPktType
 919                 }
 920         }
 921         if infosGot {
 922                 var pkts int
 923                 var size uint64
 924                 state.RLock()
 925                 for _, info := range state.infosTheir {
 926                         pkts++
 927                         size += info.Size
 928                 }
 929                 state.RUnlock()
 930                 state.ctx.LogI("sp-infos", SDS{
 931                         "xx":   string(TRx),
 932                         "node": state.Node.Id,
 933                         "pkts": strconv.Itoa(pkts),
 934                         "size": strconv.FormatInt(int64(size), 10),
 935                 }, "")
 936         }
 937         return payloadsSplit(replies), nil
 938 }