2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
3 Copyright (C) 2016-2017 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/>.
36 "github.com/davecgh/go-xdr/xdr2"
37 "github.com/dustin/go-humanize"
38 "golang.org/x/crypto/blake2b"
39 "golang.org/x/sys/unix"
42 func newNotification(fromTo *FromToYAML, subject string) io.Reader {
43 return strings.NewReader(fmt.Sprintf(
44 "From: %s\nTo: %s\nSubject: %s\n",
47 mime.BEncoding.Encode("UTF-8", subject),
51 func (ctx *Ctx) LockDir(nodeId *NodeId, xx TRxTx) (*os.File, error) {
52 ctx.ensureRxDir(nodeId)
53 lockPath := filepath.Join(ctx.Spool, nodeId.String(), string(xx)) + ".lock"
54 dirLock, err := os.OpenFile(
56 os.O_CREATE|os.O_WRONLY,
60 ctx.LogE("lockdir", SDS{"path": lockPath, "err": err}, "")
63 err = unix.Flock(int(dirLock.Fd()), unix.LOCK_EX|unix.LOCK_NB)
65 ctx.LogE("lockdir", SDS{"path": lockPath, "err": err}, "")
72 func (ctx *Ctx) UnlockDir(fd *os.File) {
74 unix.Flock(int(fd.Fd()), unix.LOCK_UN)
79 func (ctx *Ctx) Toss(nodeId *NodeId, nice uint8, dryRun bool) bool {
80 dirLock, err := ctx.LockDir(nodeId, TRx)
84 defer ctx.UnlockDir(dirLock)
86 for job := range ctx.Jobs(nodeId, TRx) {
87 pktName := filepath.Base(job.Fd.Name())
88 sds := SDS{"node": job.PktEnc.Sender, "pkt": pktName}
89 if job.PktEnc.Nice > nice {
90 ctx.LogD("rx", SdsAdd(sds, SDS{
91 "nice": strconv.Itoa(int(job.PktEnc.Nice)),
95 pipeR, pipeW := io.Pipe()
96 errs := make(chan error, 1)
98 pipeWB := bufio.NewWriter(pipeW)
102 bufio.NewReader(job.Fd),
110 ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "decryption")
116 if _, err = xdr.Unmarshal(pipeR, &pkt); err != nil {
117 ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "unmarshal")
121 pktSize = job.Size - PktEncOverhead - PktOverhead
122 sds["size"] = strconv.FormatInt(pktSize, 10)
123 ctx.LogD("rx", sds, "taken")
126 recipients := string(pkt.Path[:int(pkt.PathLen)])
127 sds := SdsAdd(sds, SDS{
131 decompressor, err := zlib.NewReader(pipeR)
135 sendmail := ctx.Neigh[*job.PktEnc.Sender].Sendmail
140 sendmail[1:len(sendmail)],
141 strings.Split(recipients, " ")...,
144 cmd.Stdin = decompressor
145 if err = cmd.Run(); err != nil {
146 ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "sendmail")
151 ctx.LogI("rx", sds, "")
153 if err = os.Remove(job.Fd.Name()); err != nil {
154 ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "remove")
159 dst := string(pkt.Path[:int(pkt.PathLen)])
160 sds := SdsAdd(sds, SDS{"type": "file", "dst": dst})
161 incoming := ctx.Neigh[*job.PktEnc.Sender].Incoming
163 ctx.LogE("rx", sds, "incoming is not allowed")
167 dir := filepath.Join(*incoming, path.Dir(dst))
168 if err = os.MkdirAll(dir, os.FileMode(0700)); err != nil {
169 ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "mkdir")
174 tmp, err := ioutil.TempFile(dir, "nncp-file")
175 sds["tmp"] = tmp.Name()
176 ctx.LogD("rx", sds, "created")
178 ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "mktemp")
182 bufW := bufio.NewWriter(tmp)
183 if _, err = io.Copy(bufW, pipeR); err != nil {
184 ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "copy")
191 dstPathOrig := filepath.Join(*incoming, dst)
192 dstPath := dstPathOrig
195 if _, err = os.Stat(dstPath); err != nil {
196 if os.IsNotExist(err) {
199 ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "stat")
203 dstPath = dstPathOrig + strconv.Itoa(dstPathCtr)
206 if err = os.Rename(tmp.Name(), dstPath); err != nil {
207 ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "rename")
212 ctx.LogI("rx", sds, "")
214 if err = os.Remove(job.Fd.Name()); err != nil {
215 ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "remove")
218 sendmail := ctx.Neigh[*ctx.Self.Id].Sendmail
219 if ctx.NotifyFile != nil {
222 append(sendmail[1:len(sendmail)], ctx.NotifyFile.To)...,
224 cmd.Stdin = newNotification(ctx.NotifyFile, fmt.Sprintf(
225 "File from %s: %s (%s)",
226 ctx.Neigh[*job.PktEnc.Sender].Name,
228 humanize.IBytes(uint64(pktSize)),
234 src := string(pkt.Path[:int(pkt.PathLen)])
235 sds := SdsAdd(sds, SDS{"type": "freq", "src": src})
236 dstRaw, err := ioutil.ReadAll(pipeR)
238 ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "read")
242 dst := string(dstRaw)
244 sender := ctx.Neigh[*job.PktEnc.Sender]
247 ctx.LogE("rx", sds, "freqing is not allowed")
252 if err = ctx.TxFile(sender, job.PktEnc.Nice, filepath.Join(*freq, src), dst); err != nil {
253 ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "tx file")
258 ctx.LogI("rx", sds, "")
260 if err = os.Remove(job.Fd.Name()); err != nil {
261 ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "remove")
264 if ctx.NotifyFreq != nil {
265 sendmail := ctx.Neigh[*ctx.Self.Id].Sendmail
268 append(sendmail[1:len(sendmail)], ctx.NotifyFreq.To)...,
270 cmd.Stdin = newNotification(ctx.NotifyFreq, fmt.Sprintf(
272 ctx.Neigh[*job.PktEnc.Sender].Name,
279 dst := new([blake2b.Size256]byte)
280 copy(dst[:], pkt.Path[:int(pkt.PathLen)])
281 nodeId := NodeId(*dst)
282 node, known := ctx.Neigh[nodeId]
283 sds := SdsAdd(sds, SDS{"type": "trns", "dst": nodeId})
285 ctx.LogE("rx", sds, "unknown node")
289 ctx.LogD("rx", sds, "taken")
291 if err = ctx.TxTrns(node, job.PktEnc.Nice, pktSize, pipeR); err != nil {
292 ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "tx trns")
297 ctx.LogI("rx", sds, "")
299 if err = os.Remove(job.Fd.Name()); err != nil {
300 ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "remove")
305 ctx.LogE("rx", sds, "unknown type")