src/cypherpunks.ru/nncp/toss.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         "bufio"
  23         "bytes"
  24         "compress/zlib"
  25         "fmt"
  26         "io"
  27         "io/ioutil"
  28         "log"
  29         "mime"
  30         "os"
  31         "os/exec"
  32         "path"
  33         "path/filepath"
  34         "strconv"
  35         "strings"
  36
  37         "github.com/davecgh/go-xdr/xdr2"
  38         "github.com/dustin/go-humanize"
  39         "golang.org/x/crypto/blake2b"
  40 )
  41
  42 const (
  43         SeenSuffix = ".seen"
  44 )
  45
  46 func newNotification(fromTo *FromToYAML, subject string) io.Reader {
  47         return strings.NewReader(fmt.Sprintf(
  48                 "From: %s\nTo: %s\nSubject: %s\n",
  49                 fromTo.From,
  50                 fromTo.To,
  51                 mime.BEncoding.Encode("UTF-8", subject),
  52         ))
  53 }
  54
  55 func (ctx *Ctx) Toss(nodeId *NodeId, nice uint8, dryRun, doSeen, noFile, noFreq, noMail, noTrns bool) bool {
  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                         if noMail {
  98                                 goto Closing
  99                         }
 100                         recipients := make([]string, 0)
 101                         for _, recipient := range bytes.Split(pkt.Path[:int(pkt.PathLen)], []byte{0}) {
 102                                 recipients = append(recipients, string(recipient))
 103                         }
 104                         sds := SdsAdd(sds, SDS{
 105                                 "type": "mail",
 106                                 "dst":  strings.Join(recipients, " "),
 107                         })
 108                         decompressor, err := zlib.NewReader(pipeR)
 109                         if err != nil {
 110                                 log.Fatalln(err)
 111                         }
 112                         sender := ctx.Neigh[*job.PktEnc.Sender]
 113                         sendmail := sender.Sendmail
 114                         if len(sendmail) == 0 {
 115                                 ctx.LogE("rx", SdsAdd(sds, SDS{"err": "No sendmail configured"}), "")
 116                                 isBad = true
 117                                 goto Closing
 118                         }
 119                         if !dryRun {
 120                                 cmd := exec.Command(
 121                                         sendmail[0],
 122                                         append(sendmail[1:len(sendmail)], recipients...)...,
 123                                 )
 124                                 cmd.Env = append(cmd.Env, "NNCP_SENDER="+sender.Id.String())
 125                                 cmd.Env = append(cmd.Env, "NNCP_NICE="+strconv.Itoa(int(pkt.Nice)))
 126                                 cmd.Stdin = decompressor
 127                                 if err = cmd.Run(); err != nil {
 128                                         ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "sendmail")
 129                                         isBad = true
 130                                         goto Closing
 131                                 }
 132                         }
 133                         ctx.LogI("rx", sds, "")
 134                         if !dryRun {
 135                                 if doSeen {
 136                                         if fd, err := os.Create(job.Fd.Name() + SeenSuffix); err == nil {
 137                                                 fd.Close()
 138                                         }
 139                                 }
 140                                 if err = os.Remove(job.Fd.Name()); err != nil {
 141                                         ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "remove")
 142                                         isBad = true
 143                                 }
 144                         }
 145                 case PktTypeFile:
 146                         if noFile {
 147                                 goto Closing
 148                         }
 149                         dst := string(pkt.Path[:int(pkt.PathLen)])
 150                         sds := SdsAdd(sds, SDS{"type": "file", "dst": dst})
 151                         if filepath.IsAbs(dst) {
 152                                 ctx.LogE("rx", sds, "non-relative destination path")
 153                                 isBad = true
 154                                 goto Closing
 155                         }
 156                         incoming := ctx.Neigh[*job.PktEnc.Sender].Incoming
 157                         if incoming == nil {
 158                                 ctx.LogE("rx", sds, "incoming is not allowed")
 159                                 isBad = true
 160                                 goto Closing
 161                         }
 162                         dir := filepath.Join(*incoming, path.Dir(dst))
 163                         if err = os.MkdirAll(dir, os.FileMode(0700)); err != nil {
 164                                 ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "mkdir")
 165                                 isBad = true
 166                                 goto Closing
 167                         }
 168                         if !dryRun {
 169                                 tmp, err := ioutil.TempFile(dir, "nncp-file")
 170                                 sds["tmp"] = tmp.Name()
 171                                 ctx.LogD("rx", sds, "created")
 172                                 if err != nil {
 173                                         ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "mktemp")
 174                                         isBad = true
 175                                         goto Closing
 176                                 }
 177                                 bufW := bufio.NewWriter(tmp)
 178                                 if _, err = io.Copy(bufW, pipeR); err != nil {
 179                                         ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "copy")
 180                                         isBad = true
 181                                         goto Closing
 182                                 }
 183                                 bufW.Flush()
 184                                 tmp.Sync()
 185                                 tmp.Close()
 186                                 dstPathOrig := filepath.Join(*incoming, dst)
 187                                 dstPath := dstPathOrig
 188                                 dstPathCtr := 0
 189                                 for {
 190                                         if _, err = os.Stat(dstPath); err != nil {
 191                                                 if os.IsNotExist(err) {
 192                                                         break
 193                                                 }
 194                                                 ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "stat")
 195                                                 isBad = true
 196                                                 goto Closing
 197                                         }
 198                                         dstPath = dstPathOrig + strconv.Itoa(dstPathCtr)
 199                                         dstPathCtr++
 200                                 }
 201                                 if err = os.Rename(tmp.Name(), dstPath); err != nil {
 202                                         ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "rename")
 203                                         isBad = true
 204                                 }
 205                                 delete(sds, "tmp")
 206                         }
 207                         ctx.LogI("rx", sds, "")
 208                         if !dryRun {
 209                                 if doSeen {
 210                                         if fd, err := os.Create(job.Fd.Name() + SeenSuffix); err == nil {
 211                                                 fd.Close()
 212                                         }
 213                                 }
 214                                 if err = os.Remove(job.Fd.Name()); err != nil {
 215                                         ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "remove")
 216                                         isBad = true
 217                                 }
 218                                 sendmail := ctx.Neigh[*ctx.SelfId].Sendmail
 219                                 if ctx.NotifyFile != nil {
 220                                         cmd := exec.Command(
 221                                                 sendmail[0],
 222                                                 append(sendmail[1:len(sendmail)], ctx.NotifyFile.To)...,
 223                                         )
 224                                         cmd.Stdin = newNotification(ctx.NotifyFile, fmt.Sprintf(
 225                                                 "File from %s: %s (%s)",
 226                                                 ctx.Neigh[*job.PktEnc.Sender].Name,
 227                                                 dst,
 228                                                 humanize.IBytes(uint64(pktSize)),
 229                                         ))
 230                                         cmd.Run()
 231                                 }
 232                         }
 233                 case PktTypeFreq:
 234                         if noFreq {
 235                                 goto Closing
 236                         }
 237                         src := string(pkt.Path[:int(pkt.PathLen)])
 238                         if filepath.IsAbs(src) {
 239                                 ctx.LogE("rx", sds, "non-relative source path")
 240                                 isBad = true
 241                                 goto Closing
 242                         }
 243                         sds := SdsAdd(sds, SDS{"type": "freq", "src": src})
 244                         dstRaw, err := ioutil.ReadAll(pipeR)
 245                         if err != nil {
 246                                 ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "read")
 247                                 isBad = true
 248                                 goto Closing
 249                         }
 250                         dst := string(dstRaw)
 251                         sds["dst"] = dst
 252                         sender := ctx.Neigh[*job.PktEnc.Sender]
 253                         freq := sender.Freq
 254                         if freq == nil {
 255                                 ctx.LogE("rx", sds, "freqing is not allowed")
 256                                 isBad = true
 257                                 goto Closing
 258                         }
 259                         if !dryRun {
 260                                 if sender.FreqChunked == 0 {
 261                                         err = ctx.TxFile(
 262                                                 sender,
 263                                                 pkt.Nice,
 264                                                 filepath.Join(*freq, src),
 265                                                 dst,
 266                                                 sender.FreqMinSize,
 267                                         )
 268                                 } else {
 269                                         err = ctx.TxFileChunked(
 270                                                 sender,
 271                                                 pkt.Nice,
 272                                                 filepath.Join(*freq, src),
 273                                                 dst,
 274                                                 sender.FreqMinSize,
 275                                                 sender.FreqChunked,
 276                                         )
 277                                 }
 278                                 if err != nil {
 279                                         ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "tx file")
 280                                         isBad = true
 281                                         goto Closing
 282                                 }
 283                         }
 284                         ctx.LogI("rx", sds, "")
 285                         if !dryRun {
 286                                 if doSeen {
 287                                         if fd, err := os.Create(job.Fd.Name() + SeenSuffix); err == nil {
 288                                                 fd.Close()
 289                                         }
 290                                 }
 291                                 if err = os.Remove(job.Fd.Name()); err != nil {
 292                                         ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "remove")
 293                                         isBad = true
 294                                 }
 295                                 if ctx.NotifyFreq != nil {
 296                                         sendmail := ctx.Neigh[*ctx.SelfId].Sendmail
 297                                         cmd := exec.Command(
 298                                                 sendmail[0],
 299                                                 append(sendmail[1:len(sendmail)], ctx.NotifyFreq.To)...,
 300                                         )
 301                                         cmd.Stdin = newNotification(ctx.NotifyFreq, fmt.Sprintf(
 302                                                 "Freq from %s: %s",
 303                                                 ctx.Neigh[*job.PktEnc.Sender].Name,
 304                                                 src,
 305                                         ))
 306                                         cmd.Run()
 307                                 }
 308                         }
 309                 case PktTypeTrns:
 310                         if noTrns {
 311                                 goto Closing
 312                         }
 313                         dst := new([blake2b.Size256]byte)
 314                         copy(dst[:], pkt.Path[:int(pkt.PathLen)])
 315                         nodeId := NodeId(*dst)
 316                         node, known := ctx.Neigh[nodeId]
 317                         sds := SdsAdd(sds, SDS{"type": "trns", "dst": nodeId})
 318                         if !known {
 319                                 ctx.LogE("rx", sds, "unknown node")
 320                                 isBad = true
 321                                 goto Closing
 322                         }
 323                         ctx.LogD("rx", sds, "taken")
 324                         if !dryRun {
 325                                 if err = ctx.TxTrns(node, job.PktEnc.Nice, pktSize, pipeR); err != nil {
 326                                         ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "tx trns")
 327                                         isBad = true
 328                                         goto Closing
 329                                 }
 330                         }
 331                         ctx.LogI("rx", sds, "")
 332                         if !dryRun {
 333                                 if doSeen {
 334                                         if fd, err := os.Create(job.Fd.Name() + SeenSuffix); err == nil {
 335                                                 fd.Close()
 336                                         }
 337                                 }
 338                                 if err = os.Remove(job.Fd.Name()); err != nil {
 339                                         ctx.LogE("rx", SdsAdd(sds, SDS{"err": err}), "remove")
 340                                         isBad = true
 341                                 }
 342                         }
 343                 default:
 344                         ctx.LogE("rx", sds, "unknown type")
 345                         isBad = true
 346                 }
 347         Closing:
 348                 pipeR.Close()
 349         }
 350         return isBad
 351 }