src/toss.go

   1 /*
   2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
   3 Copyright (C) 2016-2021 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, version 3 of the License.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18 package nncp
  19
  20 import (
  21         "bufio"
  22         "bytes"
  23         "encoding/base64"
  24         "errors"
  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         "time"
  37
  38         xdr "github.com/davecgh/go-xdr/xdr2"
  39         "github.com/dustin/go-humanize"
  40         "github.com/klauspost/compress/zstd"
  41         "golang.org/x/crypto/blake2b"
  42         "golang.org/x/crypto/poly1305"
  43 )
  44
  45 const (
  46         SeenSuffix = ".seen"
  47 )
  48
  49 func newNotification(fromTo *FromToJSON, subject string, body []byte) io.Reader {
  50         lines := []string{
  51                 "From: " + fromTo.From,
  52                 "To: " + fromTo.To,
  53                 "Subject: " + mime.BEncoding.Encode("UTF-8", subject),
  54         }
  55         if len(body) > 0 {
  56                 lines = append(lines, []string{
  57                         "MIME-Version: 1.0",
  58                         "Content-Type: text/plain; charset=utf-8",
  59                         "Content-Transfer-Encoding: base64",
  60                         "",
  61                         base64.StdEncoding.EncodeToString(body),
  62                 }...)
  63         }
  64         return strings.NewReader(strings.Join(lines, "\n"))
  65 }
  66
  67 func (ctx *Ctx) Toss(
  68         nodeId *NodeId,
  69         nice uint8,
  70         dryRun, doSeen, noFile, noFreq, noExec, noTrns bool,
  71 ) bool {
  72         dirLock, err := ctx.LockDir(nodeId, "toss")
  73         if err != nil {
  74                 ctx.LogE("rx", LEs{}, err, "lock")
  75                 return false
  76         }
  77         defer ctx.UnlockDir(dirLock)
  78         isBad := false
  79         sendmail := ctx.Neigh[*ctx.SelfId].Exec["sendmail"]
  80         decompressor, err := zstd.NewReader(nil)
  81         if err != nil {
  82                 panic(err)
  83         }
  84         defer decompressor.Close()
  85         for job := range ctx.Jobs(nodeId, TRx) {
  86                 pktName := filepath.Base(job.Fd.Name())
  87                 les := LEs{{"Node", job.PktEnc.Sender}, {"Pkt", pktName}}
  88                 if job.PktEnc.Nice > nice {
  89                         ctx.LogD("rx", append(les, LE{"Nice", int(job.PktEnc.Nice)}), "too nice")
  90                         job.Fd.Close() // #nosec G104
  91                         continue
  92                 }
  93                 pipeR, pipeW := io.Pipe()
  94                 go func(job Job) error {
  95                         pipeWB := bufio.NewWriter(pipeW)
  96                         _, _, err := PktEncRead(
  97                                 ctx.Self,
  98                                 ctx.Neigh,
  99                                 bufio.NewReader(job.Fd),
 100                                 pipeWB,
 101                         )
 102                         job.Fd.Close() // #nosec G104
 103                         if err != nil {
 104                                 return pipeW.CloseWithError(err)
 105                         }
 106                         if err = pipeWB.Flush(); err != nil {
 107                                 return pipeW.CloseWithError(err)
 108                         }
 109                         return pipeW.Close()
 110                 }(job)
 111                 var pkt Pkt
 112                 var err error
 113                 var pktSize int64
 114                 var pktSizeBlocks int64
 115                 if _, err = xdr.Unmarshal(pipeR, &pkt); err != nil {
 116                         ctx.LogE("rx", les, err, "unmarshal")
 117                         isBad = true
 118                         goto Closing
 119                 }
 120                 pktSize = job.Size - PktEncOverhead - PktOverhead - PktSizeOverhead
 121                 pktSizeBlocks = pktSize / (EncBlkSize + poly1305.TagSize)
 122                 if pktSize%(EncBlkSize+poly1305.TagSize) != 0 {
 123                         pktSize -= poly1305.TagSize
 124                 }
 125                 pktSize -= pktSizeBlocks * poly1305.TagSize
 126                 les = append(les, LE{"Size", pktSize})
 127                 ctx.LogD("rx", les, "taken")
 128                 switch pkt.Type {
 129                 case PktTypeExec, PktTypeExecFat:
 130                         if noExec {
 131                                 goto Closing
 132                         }
 133                         path := bytes.Split(pkt.Path[:int(pkt.PathLen)], []byte{0})
 134                         handle := string(path[0])
 135                         args := make([]string, 0, len(path)-1)
 136                         for _, p := range path[1:] {
 137                                 args = append(args, string(p))
 138                         }
 139                         argsStr := strings.Join(append([]string{handle}, args...), " ")
 140                         les = append(les, LEs{
 141                                 {"Type", "exec"},
 142                                 {"Dst", argsStr},
 143                         }...)
 144                         sender := ctx.Neigh[*job.PktEnc.Sender]
 145                         cmdline, exists := sender.Exec[handle]
 146                         if !exists || len(cmdline) == 0 {
 147                                 ctx.LogE("rx", les, errors.New("No handle found"), "")
 148                                 isBad = true
 149                                 goto Closing
 150                         }
 151                         if pkt.Type == PktTypeExec {
 152                                 if err = decompressor.Reset(pipeR); err != nil {
 153                                         log.Fatalln(err)
 154                                 }
 155                         }
 156                         if !dryRun {
 157                                 cmd := exec.Command(
 158                                         cmdline[0],
 159                                         append(cmdline[1:], args...)...,
 160                                 )
 161                                 cmd.Env = append(
 162                                         cmd.Env,
 163                                         "NNCP_SELF="+ctx.Self.Id.String(),
 164                                         "NNCP_SENDER="+sender.Id.String(),
 165                                         "NNCP_NICE="+strconv.Itoa(int(pkt.Nice)),
 166                                 )
 167                                 if pkt.Type == PktTypeExec {
 168                                         cmd.Stdin = decompressor
 169                                 } else {
 170                                         cmd.Stdin = pipeR
 171                                 }
 172                                 output, err := cmd.Output()
 173                                 if err != nil {
 174                                         ctx.LogE("rx", les, err, "handle")
 175                                         isBad = true
 176                                         goto Closing
 177                                 }
 178                                 if len(sendmail) > 0 && ctx.NotifyExec != nil {
 179                                         notify, exists := ctx.NotifyExec[sender.Name+"."+handle]
 180                                         if !exists {
 181                                                 notify, exists = ctx.NotifyExec["*."+handle]
 182                                         }
 183                                         if exists {
 184                                                 cmd := exec.Command(
 185                                                         sendmail[0],
 186                                                         append(sendmail[1:], notify.To)...,
 187                                                 )
 188                                                 cmd.Stdin = newNotification(notify, fmt.Sprintf(
 189                                                         "Exec from %s: %s", sender.Name, argsStr,
 190                                                 ), output)
 191                                                 if err = cmd.Run(); err != nil {
 192                                                         ctx.LogE("rx", les, err, "notify")
 193                                                 }
 194                                         }
 195                                 }
 196                         }
 197                         ctx.LogI("rx", les, "")
 198                         if !dryRun {
 199                                 if doSeen {
 200                                         if fd, err := os.Create(job.Fd.Name() + SeenSuffix); err == nil {
 201                                                 fd.Close() // #nosec G104
 202                                         }
 203                                 }
 204                                 if err = os.Remove(job.Fd.Name()); err != nil {
 205                                         ctx.LogE("rx", les, err, "remove")
 206                                         isBad = true
 207                                 }
 208                         }
 209                 case PktTypeFile:
 210                         if noFile {
 211                                 goto Closing
 212                         }
 213                         dst := string(pkt.Path[:int(pkt.PathLen)])
 214                         les = append(les, LEs{{"Type", "file"}, {"Dst", dst}}...)
 215                         if filepath.IsAbs(dst) {
 216                                 ctx.LogE("rx", les, errors.New("non-relative destination path"), "")
 217                                 isBad = true
 218                                 goto Closing
 219                         }
 220                         incoming := ctx.Neigh[*job.PktEnc.Sender].Incoming
 221                         if incoming == nil {
 222                                 ctx.LogE("rx", les, errors.New("incoming is not allowed"), "")
 223                                 isBad = true
 224                                 goto Closing
 225                         }
 226                         dir := filepath.Join(*incoming, path.Dir(dst))
 227                         if err = os.MkdirAll(dir, os.FileMode(0777)); err != nil {
 228                                 ctx.LogE("rx", les, err, "mkdir")
 229                                 isBad = true
 230                                 goto Closing
 231                         }
 232                         if !dryRun {
 233                                 tmp, err := TempFile(dir, "file")
 234                                 if err != nil {
 235                                         ctx.LogE("rx", les, err, "mktemp")
 236                                         isBad = true
 237                                         goto Closing
 238                                 }
 239                                 les = append(les, LE{"Tmp", tmp.Name()})
 240                                 ctx.LogD("rx", les, "created")
 241                                 bufW := bufio.NewWriter(tmp)
 242                                 if _, err = CopyProgressed(
 243                                         bufW, pipeR, "Rx file",
 244                                         append(les, LE{"FullSize", pktSize}),
 245                                         ctx.ShowPrgrs,
 246                                 ); err != nil {
 247                                         ctx.LogE("rx", les, err, "copy")
 248                                         isBad = true
 249                                         goto Closing
 250                                 }
 251                                 if err = bufW.Flush(); err != nil {
 252                                         tmp.Close() // #nosec G104
 253                                         ctx.LogE("rx", les, err, "copy")
 254                                         isBad = true
 255                                         goto Closing
 256                                 }
 257                                 if err = tmp.Sync(); err != nil {
 258                                         tmp.Close() // #nosec G104
 259                                         ctx.LogE("rx", les, err, "copy")
 260                                         isBad = true
 261                                         goto Closing
 262                                 }
 263                                 if err = tmp.Close(); err != nil {
 264                                         ctx.LogE("rx", les, err, "copy")
 265                                         isBad = true
 266                                         goto Closing
 267                                 }
 268                                 dstPathOrig := filepath.Join(*incoming, dst)
 269                                 dstPath := dstPathOrig
 270                                 dstPathCtr := 0
 271                                 for {
 272                                         if _, err = os.Stat(dstPath); err != nil {
 273                                                 if os.IsNotExist(err) {
 274                                                         break
 275                                                 }
 276                                                 ctx.LogE("rx", les, err, "stat")
 277                                                 isBad = true
 278                                                 goto Closing
 279                                         }
 280                                         dstPath = dstPathOrig + "." + strconv.Itoa(dstPathCtr)
 281                                         dstPathCtr++
 282                                 }
 283                                 if err = os.Rename(tmp.Name(), dstPath); err != nil {
 284                                         ctx.LogE("rx", les, err, "rename")
 285                                         isBad = true
 286                                 }
 287                                 if err = DirSync(*incoming); err != nil {
 288                                         ctx.LogE("rx", les, err, "sync")
 289                                         isBad = true
 290                                 }
 291                                 les = les[:len(les)-1] // delete Tmp
 292                         }
 293                         ctx.LogI("rx", les, "")
 294                         if !dryRun {
 295                                 if doSeen {
 296                                         if fd, err := os.Create(job.Fd.Name() + SeenSuffix); err == nil {
 297                                                 fd.Close() // #nosec G104
 298                                         }
 299                                 }
 300                                 if err = os.Remove(job.Fd.Name()); err != nil {
 301                                         ctx.LogE("rx", les, err, "remove")
 302                                         isBad = true
 303                                 }
 304                                 if len(sendmail) > 0 && ctx.NotifyFile != nil {
 305                                         cmd := exec.Command(
 306                                                 sendmail[0],
 307                                                 append(sendmail[1:], ctx.NotifyFile.To)...,
 308                                         )
 309                                         cmd.Stdin = newNotification(ctx.NotifyFile, fmt.Sprintf(
 310                                                 "File from %s: %s (%s)",
 311                                                 ctx.Neigh[*job.PktEnc.Sender].Name,
 312                                                 dst,
 313                                                 humanize.IBytes(uint64(pktSize)),
 314                                         ), nil)
 315                                         if err = cmd.Run(); err != nil {
 316                                                 ctx.LogE("rx", les, err, "notify")
 317                                         }
 318                                 }
 319                         }
 320                 case PktTypeFreq:
 321                         if noFreq {
 322                                 goto Closing
 323                         }
 324                         src := string(pkt.Path[:int(pkt.PathLen)])
 325                         if filepath.IsAbs(src) {
 326                                 ctx.LogE("rx", les, errors.New("non-relative source path"), "")
 327                                 isBad = true
 328                                 goto Closing
 329                         }
 330                         les := append(les, LEs{{"Type", "freq"}, {"Src", src}}...)
 331                         dstRaw, err := ioutil.ReadAll(pipeR)
 332                         if err != nil {
 333                                 ctx.LogE("rx", les, err, "read")
 334                                 isBad = true
 335                                 goto Closing
 336                         }
 337                         dst := string(dstRaw)
 338                         les = append(les, LE{"Dst", dst})
 339                         sender := ctx.Neigh[*job.PktEnc.Sender]
 340                         freqPath := sender.FreqPath
 341                         if freqPath == nil {
 342                                 ctx.LogE("rx", les, errors.New("freqing is not allowed"), "")
 343                                 isBad = true
 344                                 goto Closing
 345                         }
 346                         if !dryRun {
 347                                 err = ctx.TxFile(
 348                                         sender,
 349                                         pkt.Nice,
 350                                         filepath.Join(*freqPath, src),
 351                                         dst,
 352                                         sender.FreqChunked,
 353                                         sender.FreqMinSize,
 354                                         sender.FreqMaxSize,
 355                                 )
 356                                 if err != nil {
 357                                         ctx.LogE("rx", les, err, "tx file")
 358                                         isBad = true
 359                                         goto Closing
 360                                 }
 361                         }
 362                         ctx.LogI("rx", les, "")
 363                         if !dryRun {
 364                                 if doSeen {
 365                                         if fd, err := os.Create(job.Fd.Name() + SeenSuffix); err == nil {
 366                                                 fd.Close() // #nosec G104
 367                                         }
 368                                 }
 369                                 if err = os.Remove(job.Fd.Name()); err != nil {
 370                                         ctx.LogE("rx", les, err, "remove")
 371                                         isBad = true
 372                                 }
 373                                 if len(sendmail) > 0 && ctx.NotifyFreq != nil {
 374                                         cmd := exec.Command(
 375                                                 sendmail[0],
 376                                                 append(sendmail[1:], ctx.NotifyFreq.To)...,
 377                                         )
 378                                         cmd.Stdin = newNotification(ctx.NotifyFreq, fmt.Sprintf(
 379                                                 "Freq from %s: %s", sender.Name, src,
 380                                         ), nil)
 381                                         if err = cmd.Run(); err != nil {
 382                                                 ctx.LogE("rx", les, err, "notify")
 383                                         }
 384                                 }
 385                         }
 386                 case PktTypeTrns:
 387                         if noTrns {
 388                                 goto Closing
 389                         }
 390                         dst := new([blake2b.Size256]byte)
 391                         copy(dst[:], pkt.Path[:int(pkt.PathLen)])
 392                         nodeId := NodeId(*dst)
 393                         node, known := ctx.Neigh[nodeId]
 394                         les := append(les, LEs{{"Type", "trns"}, {"Dst", nodeId}}...)
 395                         if !known {
 396                                 ctx.LogE("rx", les, errors.New("unknown node"), "")
 397                                 isBad = true
 398                                 goto Closing
 399                         }
 400                         ctx.LogD("rx", les, "taken")
 401                         if !dryRun {
 402                                 if err = ctx.TxTrns(node, job.PktEnc.Nice, pktSize, pipeR); err != nil {
 403                                         ctx.LogE("rx", les, err, "tx trns")
 404                                         isBad = true
 405                                         goto Closing
 406                                 }
 407                         }
 408                         ctx.LogI("rx", les, "")
 409                         if !dryRun {
 410                                 if doSeen {
 411                                         if fd, err := os.Create(job.Fd.Name() + SeenSuffix); err == nil {
 412                                                 fd.Close() // #nosec G104
 413                                         }
 414                                 }
 415                                 if err = os.Remove(job.Fd.Name()); err != nil {
 416                                         ctx.LogE("rx", les, err, "remove")
 417                                         isBad = true
 418                                 }
 419                         }
 420                 default:
 421                         ctx.LogE("rx", les, errors.New("unknown type"), "")
 422                         isBad = true
 423                 }
 424         Closing:
 425                 pipeR.Close() // #nosec G104
 426         }
 427         return isBad
 428 }
 429
 430 func (ctx *Ctx) AutoToss(
 431         nodeId *NodeId,
 432         nice uint8,
 433         doSeen, noFile, noFreq, noExec, noTrns bool,
 434 ) (chan struct{}, chan bool) {
 435         finish := make(chan struct{})
 436         badCode := make(chan bool)
 437         go func() {
 438                 bad := false
 439                 for {
 440                         select {
 441                         case <-finish:
 442                                 badCode <- bad
 443                                 break
 444                         default:
 445                         }
 446                         time.Sleep(time.Second)
 447                         bad = !ctx.Toss(nodeId, nice, false, doSeen, noFile, noFreq, noExec, noTrns)
 448                 }
 449         }()
 450         return finish, badCode
 451 }