2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
3 Copyright (C) 2016-2018 Sergey Matveev <stargrave@stargrave.org>
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.
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.
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/>.
34 "github.com/davecgh/go-xdr/xdr2"
35 "github.com/flynn/noise"
39 MaxSPSize = 1<<16 - 256
45 MagicNNCPLv1 [8]byte = [8]byte{'N', 'N', 'C', 'P', 'S', 0, 0, 1}
51 SPHaltMarshalized []byte
53 NoiseCipherSuite noise.CipherSuite = noise.NewCipherSuite(
55 noise.CipherChaChaPoly,
59 spWorkersGroup sync.WaitGroup
65 SPTypeInfo SPType = iota
66 SPTypeFreq SPType = iota
67 SPTypeFile SPType = iota
68 SPTypeDone SPType = iota
69 SPTypeHalt SPType = iota
102 type FreqWithNice struct {
109 spHead := SPHead{Type: SPTypeHalt}
110 if _, err := xdr.Marshal(&buf, spHead); err != nil {
113 copy(SPHaltMarshalized, buf.Bytes())
114 SPHeadOverhead = buf.Len()
117 spInfo := SPInfo{Nice: 123, Size: 123, Hash: new([32]byte)}
118 if _, err := xdr.Marshal(&buf, spInfo); err != nil {
121 SPInfoOverhead = buf.Len()
124 spFreq := SPFreq{Hash: new([32]byte), Offset: 123}
125 if _, err := xdr.Marshal(&buf, spFreq); err != nil {
128 SPFreqOverhead = buf.Len()
131 spFile := SPFile{Hash: new([32]byte), Offset: 123}
132 if _, err := xdr.Marshal(&buf, spFile); err != nil {
135 SPFileOverhead = buf.Len()
138 func MarshalSP(typ SPType, sp interface{}) []byte {
141 if _, err = xdr.Marshal(&buf, SPHead{typ}); err != nil {
144 if _, err = xdr.Marshal(&buf, sp); err != nil {
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)
160 if len(outbound) > 0 {
161 outbounds = append(outbounds, outbound)
166 type SPState struct {
172 hs *noise.HandshakeState
173 csOur *noise.CipherState
174 csTheir *noise.CipherState
176 infosTheir map[[32]byte]*SPInfo
177 infosOurSeen map[[32]byte]uint8
178 queueTheir []*FreqWithNice
185 Duration time.Duration
197 func (state *SPState) NotAlive() bool {
202 if state.maxOnlineTime > 0 && state.started.Add(time.Duration(state.maxOnlineTime)*time.Second).Before(now) {
205 return uint(now.Sub(state.RxLastSeen).Seconds()) >= state.onlineDeadline &&
206 uint(now.Sub(state.TxLastSeen).Seconds()) >= state.onlineDeadline
209 func (state *SPState) dirUnlock() {
210 state.ctx.UnlockDir(state.rxLock)
211 state.ctx.UnlockDir(state.txLock)
214 func (state *SPState) WriteSP(dst io.Writer, payload []byte) error {
215 n, err := xdr.Marshal(dst, SPRaw{Magic: MagicNNCPLv1, Payload: payload})
217 state.TxLastSeen = time.Now()
218 state.TxBytes += int64(n)
223 func (state *SPState) ReadSP(src io.Reader) ([]byte, error) {
225 n, err := xdr.UnmarshalLimited(src, &sp, 1<<17)
229 state.RxLastSeen = time.Now()
230 state.RxBytes += int64(n)
231 if sp.Magic != MagicNNCPLv1 {
234 return sp.Payload, nil
237 func (ctx *Ctx) infosOur(nodeId *NodeId, nice uint8, seen *map[[32]byte]uint8) [][]byte {
240 for job := range ctx.Jobs(nodeId, TTx) {
242 if job.PktEnc.Nice > nice {
245 if _, known := (*seen)[*job.HshValue]; known {
248 totalSize += job.Size
249 infos = append(infos, &SPInfo{
250 Nice: job.PktEnc.Nice,
251 Size: uint64(job.Size),
254 (*seen)[*job.HshValue] = job.PktEnc.Nice
256 sort.Sort(ByNice(infos))
257 var payloads [][]byte
258 for _, info := range infos {
259 payloads = append(payloads, MarshalSP(SPTypeInfo, info))
260 ctx.LogD("sp-info-our", SDS{
262 "name": ToBase32(info.Hash[:]),
263 "size": strconv.FormatInt(int64(info.Size), 10),
267 ctx.LogI("sp-infos", SDS{
270 "pkts": strconv.Itoa(len(payloads)),
271 "size": strconv.FormatInt(totalSize, 10),
274 return payloadsSplit(payloads)
277 func (ctx *Ctx) StartI(
283 onlineDeadline, maxOnlineTime uint) (*SPState, error) {
284 err := ctx.ensureRxDir(nodeId)
289 if xxOnly == "" || xxOnly == TRx {
290 rxLock, err = ctx.LockDir(nodeId, TRx)
296 if xxOnly == "" || xxOnly == TTx {
297 txLock, err = ctx.LockDir(nodeId, TTx)
302 started := time.Now()
303 node := ctx.Neigh[*nodeId]
304 conf := noise.Config{
305 CipherSuite: NoiseCipherSuite,
306 Pattern: noise.HandshakeIK,
308 StaticKeypair: noise.DHKey{
309 Private: ctx.Self.NoisePrv[:],
310 Public: ctx.Self.NoisePub[:],
312 PeerStatic: node.NoisePub[:],
314 hs, err := noise.NewHandshakeState(conf)
322 onlineDeadline: onlineDeadline,
323 maxOnlineTime: maxOnlineTime,
325 payloads: make(chan []byte),
326 infosTheir: make(map[[32]byte]*SPInfo),
327 infosOurSeen: make(map[[32]byte]uint8),
336 var infosPayloads [][]byte
337 if xxOnly == "" || xxOnly == TTx {
338 infosPayloads = ctx.infosOur(nodeId, nice, &state.infosOurSeen)
340 var firstPayload []byte
341 if len(infosPayloads) > 0 {
342 firstPayload = infosPayloads[0]
344 // Pad first payload, to hide actual number of existing files
345 for i := 0; i < (MaxSPSize-len(firstPayload))/SPHeadOverhead; i++ {
346 firstPayload = append(firstPayload, SPHaltMarshalized...)
351 buf, _, _, err = state.hs.WriteMessage(nil, firstPayload)
356 sds := SDS{"node": nodeId, "nice": strconv.Itoa(int(nice))}
357 ctx.LogD("sp-start", sds, "sending first message")
358 conn.SetWriteDeadline(time.Now().Add(DefaultDeadline * time.Second))
359 if err = state.WriteSP(conn, buf); err != nil {
360 ctx.LogE("sp-start", SdsAdd(sds, SDS{"err": err}), "")
364 ctx.LogD("sp-start", sds, "waiting for first message")
365 conn.SetReadDeadline(time.Now().Add(DefaultDeadline * time.Second))
366 if buf, err = state.ReadSP(conn); err != nil {
367 ctx.LogE("sp-start", SdsAdd(sds, SDS{"err": err}), "")
371 payload, state.csOur, state.csTheir, err = state.hs.ReadMessage(nil, buf)
373 ctx.LogE("sp-start", SdsAdd(sds, SDS{"err": err}), "")
377 ctx.LogD("sp-start", sds, "starting workers")
378 err = state.StartWorkers(conn, infosPayloads, payload)
380 ctx.LogE("sp-start", SdsAdd(sds, SDS{"err": err}), "")
387 func (ctx *Ctx) StartR(conn net.Conn, nice uint8, xxOnly TRxTx) (*SPState, error) {
388 started := time.Now()
389 conf := noise.Config{
390 CipherSuite: NoiseCipherSuite,
391 Pattern: noise.HandshakeIK,
393 StaticKeypair: noise.DHKey{
394 Private: ctx.Self.NoisePrv[:],
395 Public: ctx.Self.NoisePub[:],
398 hs, err := noise.NewHandshakeState(conf)
406 payloads: make(chan []byte),
407 infosOurSeen: make(map[[32]byte]uint8),
408 infosTheir: make(map[[32]byte]*SPInfo),
416 SDS{"nice": strconv.Itoa(int(nice))},
417 "waiting for first message",
419 conn.SetReadDeadline(time.Now().Add(DefaultDeadline * time.Second))
420 if buf, err = state.ReadSP(conn); err != nil {
421 ctx.LogE("sp-start", SDS{"err": err}, "")
424 if payload, _, _, err = state.hs.ReadMessage(nil, buf); err != nil {
425 ctx.LogE("sp-start", SDS{"err": err}, "")
430 for _, node = range ctx.Neigh {
431 if subtle.ConstantTimeCompare(state.hs.PeerStatic(), node.NoisePub[:]) == 1 {
436 peerId := ToBase32(state.hs.PeerStatic())
437 ctx.LogE("sp-start", SDS{"peer": peerId}, "unknown")
438 return nil, errors.New("Unknown peer: " + peerId)
441 state.rxRate = node.RxRate
442 state.txRate = node.TxRate
443 state.onlineDeadline = node.OnlineDeadline
444 state.maxOnlineTime = node.MaxOnlineTime
445 sds := SDS{"node": node.Id, "nice": strconv.Itoa(int(nice))}
447 if ctx.ensureRxDir(node.Id); err != nil {
451 if xxOnly == "" || xxOnly == TRx {
452 rxLock, err = ctx.LockDir(node.Id, TRx)
457 state.rxLock = rxLock
459 if xxOnly == "" || xxOnly == TTx {
460 txLock, err = ctx.LockDir(node.Id, TTx)
465 state.txLock = txLock
467 var infosPayloads [][]byte
468 if xxOnly == "" || xxOnly == TTx {
469 infosPayloads = ctx.infosOur(node.Id, nice, &state.infosOurSeen)
471 var firstPayload []byte
472 if len(infosPayloads) > 0 {
473 firstPayload = infosPayloads[0]
475 // Pad first payload, to hide actual number of existing files
476 for i := 0; i < (MaxSPSize-len(firstPayload))/SPHeadOverhead; i++ {
477 firstPayload = append(firstPayload, SPHaltMarshalized...)
480 ctx.LogD("sp-start", sds, "sending first message")
481 buf, state.csTheir, state.csOur, err = state.hs.WriteMessage(nil, firstPayload)
486 conn.SetWriteDeadline(time.Now().Add(DefaultDeadline * time.Second))
487 if err = state.WriteSP(conn, buf); err != nil {
488 ctx.LogE("sp-start", SdsAdd(sds, SDS{"err": err}), "")
492 ctx.LogD("sp-start", sds, "starting workers")
493 err = state.StartWorkers(conn, infosPayloads, payload)
501 func (state *SPState) StartWorkers(
503 infosPayloads [][]byte,
504 payload []byte) error {
505 sds := SDS{"node": state.Node.Id, "nice": strconv.Itoa(int(state.nice))}
506 if len(infosPayloads) > 1 {
508 for _, payload := range infosPayloads[1:] {
511 SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
512 "queuing remaining payload",
514 state.payloads <- payload
520 SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
521 "processing first payload",
523 replies, err := state.ProcessSP(payload)
525 state.ctx.LogE("sp-work", SdsAdd(sds, SDS{"err": err}), "")
530 for _, reply := range replies {
533 SdsAdd(sds, SDS{"size": strconv.Itoa(len(reply))}),
536 state.payloads <- reply
540 if state.xxOnly == "" || state.xxOnly == TTx {
542 for range time.Tick(time.Second) {
543 for _, payload := range state.ctx.infosOur(
550 SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
553 state.payloads <- payload
566 if state.NotAlive() {
571 case payload = <-state.payloads:
574 SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
581 if len(state.queueTheir) == 0 {
582 state.ctx.LogD("sp-xmit", sds, "file queue is empty")
584 time.Sleep(100 * time.Millisecond)
587 freq := state.queueTheir[0].freq
590 if state.txRate > 0 {
591 time.Sleep(time.Second / time.Duration(state.txRate))
594 sdsp := SdsAdd(sds, SDS{
596 "hash": ToBase32(freq.Hash[:]),
597 "size": strconv.FormatInt(int64(freq.Offset), 10),
599 state.ctx.LogD("sp-file", sdsp, "queueing")
600 fd, err := os.Open(filepath.Join(
602 state.Node.Id.String(),
604 ToBase32(freq.Hash[:]),
607 state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
612 state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
615 fullSize := uint64(fi.Size())
617 if freq.Offset < fullSize {
618 state.ctx.LogD("sp-file", sdsp, "seeking")
619 if _, err = fd.Seek(int64(freq.Offset), 0); err != nil {
620 state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
623 buf = make([]byte, MaxSPSize-SPHeadOverhead-SPFileOverhead)
624 n, err := fd.Read(buf)
626 state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
632 SdsAdd(sdsp, SDS{"size": strconv.Itoa(n)}),
637 payload = MarshalSP(SPTypeFile, SPFile{
642 ourSize := freq.Offset + uint64(len(buf))
643 sdsp["size"] = strconv.FormatInt(int64(ourSize), 10)
644 sdsp["fullsize"] = strconv.FormatInt(int64(fullSize), 10)
645 state.ctx.LogP("sp-file", sdsp, "")
647 if len(state.queueTheir) > 0 && *state.queueTheir[0].freq.Hash == *freq.Hash {
648 if ourSize == fullSize {
649 state.ctx.LogD("sp-file", sdsp, "finished")
650 if len(state.queueTheir) > 1 {
651 state.queueTheir = state.queueTheir[1:]
653 state.queueTheir = state.queueTheir[:0]
656 state.queueTheir[0].freq.Offset += uint64(len(buf))
659 state.ctx.LogD("sp-file", sdsp, "queue disappeared")
665 SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
668 conn.SetWriteDeadline(time.Now().Add(DefaultDeadline * time.Second))
669 if err := state.WriteSP(conn, state.csOur.Encrypt(nil, nil, payload)); err != nil {
670 state.ctx.LogE("sp-xmit", SdsAdd(sds, SDS{"err": err}), "")
683 if state.NotAlive() {
686 state.ctx.LogD("sp-recv", sds, "waiting for payload")
687 conn.SetReadDeadline(time.Now().Add(DefaultDeadline * time.Second))
688 payload, err := state.ReadSP(conn)
690 unmarshalErr := err.(*xdr.UnmarshalError)
691 netErr, ok := unmarshalErr.Err.(net.Error)
692 if ok && netErr.Timeout() {
695 if unmarshalErr.ErrorCode == xdr.ErrIO {
698 state.ctx.LogE("sp-recv", SdsAdd(sds, SDS{"err": err}), "")
703 SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
706 payload, err = state.csTheir.Decrypt(nil, nil, payload)
708 state.ctx.LogE("sp-recv", SdsAdd(sds, SDS{"err": err}), "")
713 SdsAdd(sds, SDS{"size": strconv.Itoa(len(payload))}),
716 replies, err := state.ProcessSP(payload)
718 state.ctx.LogE("sp-recv", SdsAdd(sds, SDS{"err": err}), "")
722 for _, reply := range replies {
725 SdsAdd(sds, SDS{"size": strconv.Itoa(len(reply))}),
728 state.payloads <- reply
731 if state.rxRate > 0 {
732 time.Sleep(time.Second / time.Duration(state.rxRate))
740 func (state *SPState) Wait() {
743 state.Duration = time.Now().Sub(state.started)
744 state.RxSpeed = state.RxBytes
745 state.TxSpeed = state.TxBytes
746 rxDuration := int64(state.RxLastSeen.Sub(state.started).Seconds())
747 txDuration := int64(state.TxLastSeen.Sub(state.started).Seconds())
749 state.RxSpeed = state.RxBytes / rxDuration
752 state.TxSpeed = state.TxBytes / txDuration
756 func (state *SPState) ProcessSP(payload []byte) ([][]byte, error) {
757 sds := SDS{"node": state.Node.Id, "nice": strconv.Itoa(int(state.nice))}
758 r := bytes.NewReader(payload)
763 state.ctx.LogD("sp-process", sds, "unmarshaling header")
765 if _, err = xdr.Unmarshal(r, &head); err != nil {
766 state.ctx.LogE("sp-process", SdsAdd(sds, SDS{"err": err}), "")
772 sdsp := SdsAdd(sds, SDS{"type": "info"})
773 state.ctx.LogD("sp-process", sdsp, "unmarshaling packet")
775 if _, err = xdr.Unmarshal(r, &info); err != nil {
776 state.ctx.LogE("sp-process", SdsAdd(sdsp, SDS{"err": err}), "")
779 sdsp = SdsAdd(sds, SDS{
780 "hash": ToBase32(info.Hash[:]),
781 "size": strconv.FormatInt(int64(info.Size), 10),
783 if info.Nice > state.nice {
784 state.ctx.LogD("sp-process", sdsp, "too nice")
787 state.ctx.LogD("sp-process", sdsp, "received")
788 if state.xxOnly == TTx {
792 state.infosTheir[*info.Hash] = &info
794 state.ctx.LogD("sp-process", sdsp, "stating part")
795 pktPath := filepath.Join(
797 state.Node.Id.String(),
799 ToBase32(info.Hash[:]),
801 if _, err = os.Stat(pktPath); err == nil {
802 state.ctx.LogD("sp-process", sdsp, "already done")
803 replies = append(replies, MarshalSP(SPTypeDone, SPDone{info.Hash}))
806 if _, err = os.Stat(pktPath + SeenSuffix); err == nil {
807 state.ctx.LogD("sp-process", sdsp, "already seen")
808 replies = append(replies, MarshalSP(SPTypeDone, SPDone{info.Hash}))
811 fi, err := os.Stat(pktPath + PartSuffix)
817 SdsAdd(sdsp, SDS{"offset": strconv.FormatInt(offset, 10)}),
821 replies = append(replies, MarshalSP(
823 SPFreq{info.Hash, uint64(offset)},
828 SdsAdd(sds, SDS{"type": "file"}),
829 "unmarshaling packet",
832 if _, err = xdr.Unmarshal(r, &file); err != nil {
833 state.ctx.LogE("sp-process", SdsAdd(sds, SDS{
839 sdsp := SdsAdd(sds, SDS{
841 "hash": ToBase32(file.Hash[:]),
842 "size": strconv.Itoa(len(file.Payload)),
844 filePath := filepath.Join(
846 state.Node.Id.String(),
848 ToBase32(file.Hash[:]),
850 state.ctx.LogD("sp-file", sdsp, "opening part")
851 fd, err := os.OpenFile(
853 os.O_RDWR|os.O_CREATE,
857 state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
862 SdsAdd(sdsp, SDS{"offset": strconv.FormatInt(int64(file.Offset), 10)}),
865 if _, err = fd.Seek(int64(file.Offset), 0); err != nil {
866 state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
870 state.ctx.LogD("sp-file", sdsp, "writing")
871 _, err = fd.Write(file.Payload)
873 state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "")
877 ourSize := uint64(file.Offset) + uint64(len(file.Payload))
879 sdsp["fullsize"] = strconv.FormatInt(int64(state.infosTheir[*file.Hash].Size), 10)
880 sdsp["size"] = strconv.FormatInt(int64(ourSize), 10)
881 state.ctx.LogP("sp-file", sdsp, "")
882 if state.infosTheir[*file.Hash].Size != ourSize {
888 spWorkersGroup.Wait()
889 spWorkersGroup.Add(1)
891 if err := fd.Sync(); err != nil {
892 state.ctx.LogE("sp-file", SdsAdd(sdsp, SDS{"err": err}), "sync")
897 defer state.wg.Done()
899 state.ctx.LogD("sp-file", sdsp, "checking")
900 gut, err := Check(fd, file.Hash[:])
902 if err != nil || !gut {
903 state.ctx.LogE("sp-file", sdsp, "checksum mismatch")
906 state.ctx.LogI("sp-done", SdsAdd(sdsp, SDS{"xx": string(TRx)}), "")
907 os.Rename(filePath+PartSuffix, filePath)
909 delete(state.infosTheir, *file.Hash)
911 spWorkersGroup.Done()
913 state.payloads <- MarshalSP(SPTypeDone, SPDone{file.Hash})
919 SdsAdd(sds, SDS{"type": "done"}),
920 "unmarshaling packet",
923 if _, err = xdr.Unmarshal(r, &done); err != nil {
924 state.ctx.LogE("sp-process", SdsAdd(sds, SDS{
930 sdsp := SdsAdd(sds, SDS{"hash": ToBase32(done.Hash[:])})
931 state.ctx.LogD("sp-done", sdsp, "removing")
932 err := os.Remove(filepath.Join(
934 state.Node.Id.String(),
936 ToBase32(done.Hash[:]),
939 state.ctx.LogI("sp-done", SdsAdd(sdsp, SDS{"xx": string(TTx)}), "")
941 state.ctx.LogE("sp-done", SdsAdd(sdsp, SDS{"xx": string(TTx)}), "")
944 sdsp := SdsAdd(sds, SDS{"type": "freq"})
945 state.ctx.LogD("sp-process", sdsp, "unmarshaling packet")
947 if _, err = xdr.Unmarshal(r, &freq); err != nil {
948 state.ctx.LogE("sp-process", SdsAdd(sdsp, SDS{"err": err}), "")
951 state.ctx.LogD("sp-process", SdsAdd(sdsp, SDS{
952 "hash": ToBase32(freq.Hash[:]),
953 "offset": strconv.FormatInt(int64(freq.Offset), 10),
955 nice, exists := state.infosOurSeen[*freq.Hash]
959 var freqWithNice *FreqWithNice
960 for insertIdx, freqWithNice = range state.queueTheir {
961 if freqWithNice.nice > nice {
965 state.queueTheir = append(state.queueTheir, nil)
966 copy(state.queueTheir[insertIdx+1:], state.queueTheir[insertIdx:])
967 state.queueTheir[insertIdx] = &FreqWithNice{&freq, nice}
970 state.ctx.LogD("sp-process", SdsAdd(sdsp, SDS{
971 "hash": ToBase32(freq.Hash[:]),
972 "offset": strconv.FormatInt(int64(freq.Offset), 10),
976 sdsp := SdsAdd(sds, SDS{"type": "halt"})
977 state.ctx.LogD("sp-process", sdsp, "")
979 state.queueTheir = nil
984 SdsAdd(sds, SDS{"type": head.Type}),
987 return nil, BadPktType
994 for _, info := range state.infosTheir {
999 state.ctx.LogI("sp-infos", SDS{
1001 "node": state.Node.Id,
1002 "pkts": strconv.Itoa(pkts),
1003 "size": strconv.FormatInt(int64(size), 10),
1006 return payloadsSplit(replies), nil