src/cypherpunks.ru/nncp/toss.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         "bufio"
  23         "compress/zlib"
  24         "fmt"
  25         "io"
  26         "io/ioutil"
  27         "log"
  28         "mime"
  29         "os"
  30         "os/exec"
  31         "path"
  32         "path/filepath"
  33         "strconv"
  34         "strings"
  35
  36         "github.com/davecgh/go-xdr/xdr2"
  37         "github.com/dustin/go-humanize"
  38         "golang.org/x/crypto/blake2b"
  39 )
  40
  41 func newNotification(fromTo *FromToYAML, subject string) io.Reader {
  42         return strings.NewReader(fmt.Sprintf(
  43                 "From: %s\nTo: %s\nSubject: %s\n",
  44                 fromTo.From,
  45                 fromTo.To,
  46                 mime.BEncoding.Encode("UTF-8", subject),
  47         ))
  48 }
  49
  50 func (ctx *Ctx) Toss(nodeId *NodeId, nice uint8, dryRun bool) bool {
  51         dirLock, err := ctx.LockDir(nodeId, TRx)
  52         if err != nil {
  53                 return false
  54         }
  55         defer ctx.UnlockDir(dirLock)
  56         isBad := false
  57         for job := range ctx.Jobs(nodeId, TRx) {
  58                 pktName := filepath.Base(job.Fd.Name())
  59                 sds := SDS{"node": job.PktEnc.Sender, "pkt": pktName}
  60                 if job.PktEnc.Nice > nice {
  61                         ctx.LogD("rx", SdsAdd(sds, SDS{
  62                                 "nice": strconv.Itoa(int(job.PktEnc.Nice)),
  63                         }), "too nice")
  64                         continue
  65                 }
  66                 pipeR, pipeW := io.Pipe()
  67                 errs := make(chan error, 1)
  68                 go func(job Job) {
  69                         pipeWB := bufio.NewWriter(pipeW)
  70                         _, _, err := PktEncRead(
  71                                 ctx.Self,
  72                                 ctx.Neigh,
  73                                 bufio.NewReader(job.Fd),
  74                                 pipeWB,
  75                         )
  76                         errs <- err
  77                         pipeWB.Flush()
  78                         pipeW.Close()
  79                         job.Fd.Close()
  80                         if err != nil {
  81                                 ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "decryption")
  82                         }
  83                 }(job)
  84                 var pkt Pkt
  85                 var err error
  86                 var pktSize int64
  87                 if _, err = xdr.Unmarshal(pipeR, &pkt); err != nil {
  88                         ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "unmarshal")
  89                         isBad = true
  90                         goto Closing
  91                 }
  92                 pktSize = job.Size - PktEncOverhead - PktOverhead
  93                 sds["size"] = strconv.FormatInt(pktSize, 10)
  94                 ctx.LogD("rx", sds, "taken")
  95                 switch pkt.Type {
  96                 case PktTypeMail:
  97                         recipients := string(pkt.Path[:int(pkt.PathLen)])
  98                         sds := SdsAdd(sds, SDS{
  99                                 "type": "mail",
 100                                 "dst":  recipients,
 101                         })
 102                         decompressor, err := zlib.NewReader(pipeR)
 103                         if err != nil {
 104                                 log.Fatalln(err)
 105                         }
 106                         sendmail := ctx.Neigh[*job.PktEnc.Sender].Sendmail
 107                         if len(sendmail) == 0 {
 108                                 ctx.LogE("rx", SdsAdd(sds, SDS{"err": "No sendmail configured"}), "")
 109                                 isBad = true
 110                                 goto Closing
 111                         }
 112                         if !dryRun {
 113                                 cmd := exec.Command(
 114                                         sendmail[0],
 115                                         append(
 116                                                 sendmail[1:len(sendmail)],
 117                                                 strings.Split(recipients, " ")...,
 118                                         )...,
 119                                 )
 120                                 cmd.Stdin = decompressor
 121                                 if err = cmd.Run(); err != nil {
 122                                         ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "sendmail")
 123                                         isBad = true
 124                                         goto Closing
 125                                 }
 126                         }
 127                         ctx.LogI("rx", sds, "")
 128                         if !dryRun {
 129                                 if err = os.Remove(job.Fd.Name()); err != nil {
 130                                         ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "remove")
 131                                         isBad = true
 132                                 }
 133                         }
 134                 case PktTypeFile:
 135                         dst := string(pkt.Path[:int(pkt.PathLen)])
 136                         sds := SdsAdd(sds, SDS{"type": "file", "dst": dst})
 137                         if filepath.IsAbs(dst) {
 138                                 ctx.LogE("rx", sds, "non-relative destination path")
 139                                 isBad = true
 140                                 goto Closing
 141                         }
 142                         incoming := ctx.Neigh[*job.PktEnc.Sender].Incoming
 143                         if incoming == nil {
 144                                 ctx.LogE("rx", sds, "incoming is not allowed")
 145                                 isBad = true
 146                                 goto Closing
 147                         }
 148                         dir := filepath.Join(*incoming, path.Dir(dst))
 149                         if err = os.MkdirAll(dir, os.FileMode(0700)); err != nil {
 150                                 ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "mkdir")
 151                                 isBad = true
 152                                 goto Closing
 153                         }
 154                         if !dryRun {
 155                                 tmp, err := ioutil.TempFile(dir, "nncp-file")
 156                                 sds["tmp"] = tmp.Name()
 157                                 ctx.LogD("rx", sds, "created")
 158                                 if err != nil {
 159                                         ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "mktemp")
 160                                         isBad = true
 161                                         goto Closing
 162                                 }
 163                                 bufW := bufio.NewWriter(tmp)
 164                                 if _, err = io.Copy(bufW, pipeR); err != nil {
 165                                         ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "copy")
 166                                         isBad = true
 167                                         goto Closing
 168                                 }
 169                                 bufW.Flush()
 170                                 tmp.Sync()
 171                                 tmp.Close()
 172                                 dstPathOrig := filepath.Join(*incoming, dst)
 173                                 dstPath := dstPathOrig
 174                                 dstPathCtr := 0
 175                                 for {
 176                                         if _, err = os.Stat(dstPath); err != nil {
 177                                                 if os.IsNotExist(err) {
 178                                                         break
 179                                                 }
 180                                                 ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "stat")
 181                                                 isBad = true
 182                                                 goto Closing
 183                                         }
 184                                         dstPath = dstPathOrig + strconv.Itoa(dstPathCtr)
 185                                         dstPathCtr++
 186                                 }
 187                                 if err = os.Rename(tmp.Name(), dstPath); err != nil {
 188                                         ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "rename")
 189                                         isBad = true
 190                                 }
 191                                 delete(sds, "tmp")
 192                         }
 193                         ctx.LogI("rx", sds, "")
 194                         if !dryRun {
 195                                 if err = os.Remove(job.Fd.Name()); err != nil {
 196                                         ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "remove")
 197                                         isBad = true
 198                                 }
 199                                 sendmail := ctx.Neigh[*ctx.SelfId].Sendmail
 200                                 if ctx.NotifyFile != nil {
 201                                         cmd := exec.Command(
 202                                                 sendmail[0],
 203                                                 append(sendmail[1:len(sendmail)], ctx.NotifyFile.To)...,
 204                                         )
 205                                         cmd.Stdin = newNotification(ctx.NotifyFile, fmt.Sprintf(
 206                                                 "File from %s: %s (%s)",
 207                                                 ctx.Neigh[*job.PktEnc.Sender].Name,
 208                                                 dst,
 209                                                 humanize.IBytes(uint64(pktSize)),
 210                                         ))
 211                                         cmd.Run()
 212                                 }
 213                         }
 214                 case PktTypeFreq:
 215                         src := string(pkt.Path[:int(pkt.PathLen)])
 216                         if filepath.IsAbs(src) {
 217                                 ctx.LogE("rx", sds, "non-relative source path")
 218                                 isBad = true
 219                                 goto Closing
 220                         }
 221                         sds := SdsAdd(sds, SDS{"type": "freq", "src": src})
 222                         dstRaw, err := ioutil.ReadAll(pipeR)
 223                         if err != nil {
 224                                 ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "read")
 225                                 isBad = true
 226                                 goto Closing
 227                         }
 228                         dst := string(dstRaw)
 229                         sds["dst"] = dst
 230                         sender := ctx.Neigh[*job.PktEnc.Sender]
 231                         freq := sender.Freq
 232                         if freq == nil {
 233                                 ctx.LogE("rx", sds, "freqing is not allowed")
 234                                 isBad = true
 235                                 goto Closing
 236                         }
 237                         if !dryRun {
 238                                 if sender.FreqChunked == 0 {
 239                                         err = ctx.TxFile(
 240                                                 sender,
 241                                                 job.PktEnc.Nice,
 242                                                 filepath.Join(*freq, src),
 243                                                 dst,
 244                                                 sender.FreqMinSize,
 245                                         )
 246                                 } else {
 247                                         err = ctx.TxFileChunked(
 248                                                 sender,
 249                                                 job.PktEnc.Nice,
 250                                                 filepath.Join(*freq, src),
 251                                                 dst,
 252                                                 sender.FreqMinSize,
 253                                                 sender.FreqChunked,
 254                                         )
 255                                 }
 256                                 if err != nil {
 257                                         ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "tx file")
 258                                         isBad = true
 259                                         goto Closing
 260                                 }
 261                         }
 262                         ctx.LogI("rx", sds, "")
 263                         if !dryRun {
 264                                 if err = os.Remove(job.Fd.Name()); err != nil {
 265                                         ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "remove")
 266                                         isBad = true
 267                                 }
 268                                 if ctx.NotifyFreq != nil {
 269                                         sendmail := ctx.Neigh[*ctx.SelfId].Sendmail
 270                                         cmd := exec.Command(
 271                                                 sendmail[0],
 272                                                 append(sendmail[1:len(sendmail)], ctx.NotifyFreq.To)...,
 273                                         )
 274                                         cmd.Stdin = newNotification(ctx.NotifyFreq, fmt.Sprintf(
 275                                                 "Freq from %s: %s",
 276                                                 ctx.Neigh[*job.PktEnc.Sender].Name,
 277                                                 src,
 278                                         ))
 279                                         cmd.Run()
 280                                 }
 281                         }
 282                 case PktTypeTrns:
 283                         dst := new([blake2b.Size256]byte)
 284                         copy(dst[:], pkt.Path[:int(pkt.PathLen)])
 285                         nodeId := NodeId(*dst)
 286                         node, known := ctx.Neigh[nodeId]
 287                         sds := SdsAdd(sds, SDS{"type": "trns", "dst": nodeId})
 288                         if !known {
 289                                 ctx.LogE("rx", sds, "unknown node")
 290                                 isBad = true
 291                                 goto Closing
 292                         }
 293                         ctx.LogD("rx", sds, "taken")
 294                         if !dryRun {
 295                                 if err = ctx.TxTrns(node, job.PktEnc.Nice, pktSize, pipeR); err != nil {
 296                                         ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "tx trns")
 297                                         isBad = true
 298                                         goto Closing
 299                                 }
 300                         }
 301                         ctx.LogI("rx", sds, "")
 302                         if !dryRun {
 303                                 if err = os.Remove(job.Fd.Name()); err != nil {
 304                                         ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "remove")
 305                                         isBad = true
 306                                 }
 307                         }
 308                 default:
 309                         ctx.LogE("rx", sds, "unknown type")
 310                         isBad = true
 311                 }
 312         Closing:
 313                 pipeR.Close()
 314         }
 315         return isBad
 316 }