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", SDS{}, 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                 sds := SDS{"node": job.PktEnc.Sender, "pkt": pktName}
  88                 if job.PktEnc.Nice > nice {
  89                         ctx.LogD("rx", SdsAdd(sds, SDS{"nice": int(job.PktEnc.Nice)}), "too nice")
  90                         continue
  91                 }
  92                 pipeR, pipeW := io.Pipe()
  93                 go func(job Job) error {
  94                         pipeWB := bufio.NewWriter(pipeW)
  95                         _, _, err := PktEncRead(
  96                                 ctx.Self,
  97                                 ctx.Neigh,
  98                                 bufio.NewReader(job.Fd),
  99                                 pipeWB,
 100                         )
 101                         job.Fd.Close() // #nosec G104
 102                         if err != nil {
 103                                 ctx.LogE("rx", sds, err, "decryption")
 104                                 return pipeW.CloseWithError(err)
 105                         }
 106                         if err = pipeWB.Flush(); err != nil {
 107                                 ctx.LogE("rx", sds, err, "decryption flush")
 108                                 return pipeW.CloseWithError(err)
 109                         }
 110                         return pipeW.Close()
 111                 }(job)
 112                 var pkt Pkt
 113                 var err error
 114                 var pktSize int64
 115                 var pktSizeBlocks int64
 116                 if _, err = xdr.Unmarshal(pipeR, &pkt); err != nil {
 117                         ctx.LogE("rx", sds, err, "unmarshal")
 118                         isBad = true
 119                         goto Closing
 120                 }
 121                 pktSize = job.Size - PktEncOverhead - PktOverhead - PktSizeOverhead
 122                 pktSizeBlocks = pktSize / (EncBlkSize + poly1305.TagSize)
 123                 if pktSize%(EncBlkSize+poly1305.TagSize) != 0 {
 124                         pktSize -= poly1305.TagSize
 125                 }
 126                 pktSize -= pktSizeBlocks * poly1305.TagSize
 127                 sds["size"] = pktSize
 128                 ctx.LogD("rx", sds, "taken")
 129                 switch pkt.Type {
 130                 case PktTypeExec, PktTypeExecFat:
 131                         if noExec {
 132                                 goto Closing
 133                         }
 134                         path := bytes.Split(pkt.Path[:int(pkt.PathLen)], []byte{0})
 135                         handle := string(path[0])
 136                         args := make([]string, 0, len(path)-1)
 137                         for _, p := range path[1:] {
 138                                 args = append(args, string(p))
 139                         }
 140                         argsStr := strings.Join(append([]string{handle}, args...), " ")
 141                         sds := SdsAdd(sds, SDS{
 142                                 "type": "exec",
 143                                 "dst":  argsStr,
 144                         })
 145                         sender := ctx.Neigh[*job.PktEnc.Sender]
 146                         cmdline, exists := sender.Exec[handle]
 147                         if !exists || len(cmdline) == 0 {
 148                                 ctx.LogE("rx", sds, errors.New("No handle found"), "")
 149                                 isBad = true
 150                                 goto Closing
 151                         }
 152                         if pkt.Type == PktTypeExec {
 153                                 if err = decompressor.Reset(pipeR); err != nil {
 154                                         log.Fatalln(err)
 155                                 }
 156                         }
 157                         if !dryRun {
 158                                 cmd := exec.Command(
 159                                         cmdline[0],
 160                                         append(cmdline[1:len(cmdline)], args...)...,
 161                                 )
 162                                 cmd.Env = append(
 163                                         cmd.Env,
 164                                         "NNCP_SELF="+ctx.Self.Id.String(),
 165                                         "NNCP_SENDER="+sender.Id.String(),
 166                                         "NNCP_NICE="+strconv.Itoa(int(pkt.Nice)),
 167                                 )
 168                                 if pkt.Type == PktTypeExec {
 169                                         cmd.Stdin = decompressor
 170                                 } else {
 171                                         cmd.Stdin = pipeR
 172                                 }
 173                                 output, err := cmd.Output()
 174                                 if err != nil {
 175                                         ctx.LogE("rx", sds, err, "handle")
 176                                         isBad = true
 177                                         goto Closing
 178                                 }
 179                                 if len(sendmail) > 0 && ctx.NotifyExec != nil {
 180                                         notify, exists := ctx.NotifyExec[sender.Name+"."+handle]
 181                                         if !exists {
 182                                                 notify, exists = ctx.NotifyExec["*."+handle]
 183                                         }
 184                                         if exists {
 185                                                 cmd := exec.Command(
 186                                                         sendmail[0],
 187                                                         append(sendmail[1:len(sendmail)], notify.To)...,
 188                                                 )
 189                                                 cmd.Stdin = newNotification(notify, fmt.Sprintf(
 190                                                         "Exec from %s: %s", sender.Name, argsStr,
 191                                                 ), output)
 192                                                 if err = cmd.Run(); err != nil {
 193                                                         ctx.LogE("rx", sds, err, "notify")
 194                                                 }
 195                                         }
 196                                 }
 197                         }
 198                         ctx.LogI("rx", sds, "")
 199                         if !dryRun {
 200                                 if doSeen {
 201                                         if fd, err := os.Create(job.Fd.Name() + SeenSuffix); err == nil {
 202                                                 fd.Close() // #nosec G104
 203                                         }
 204                                 }
 205                                 if err = os.Remove(job.Fd.Name()); err != nil {
 206                                         ctx.LogE("rx", sds, err, "remove")
 207                                         isBad = true
 208                                 }
 209                         }
 210                 case PktTypeFile:
 211                         if noFile {
 212                                 goto Closing
 213                         }
 214                         dst := string(pkt.Path[:int(pkt.PathLen)])
 215                         sds := SdsAdd(sds, SDS{"type": "file", "dst": dst})
 216                         if filepath.IsAbs(dst) {
 217                                 ctx.LogE("rx", sds, errors.New("non-relative destination path"), "")
 218                                 isBad = true
 219                                 goto Closing
 220                         }
 221                         incoming := ctx.Neigh[*job.PktEnc.Sender].Incoming
 222                         if incoming == nil {
 223                                 ctx.LogE("rx", sds, errors.New("incoming is not allowed"), "")
 224                                 isBad = true
 225                                 goto Closing
 226                         }
 227                         dir := filepath.Join(*incoming, path.Dir(dst))
 228                         if err = os.MkdirAll(dir, os.FileMode(0777)); err != nil {
 229                                 ctx.LogE("rx", sds, err, "mkdir")
 230                                 isBad = true
 231                                 goto Closing
 232                         }
 233                         if !dryRun {
 234                                 tmp, err := TempFile(dir, "file")
 235                                 if err != nil {
 236                                         ctx.LogE("rx", sds, err, "mktemp")
 237                                         isBad = true
 238                                         goto Closing
 239                                 }
 240                                 sds["tmp"] = tmp.Name()
 241                                 ctx.LogD("rx", sds, "created")
 242                                 bufW := bufio.NewWriter(tmp)
 243                                 if _, err = CopyProgressed(
 244                                         bufW, pipeR, "Rx file",
 245                                         SdsAdd(sds, SDS{"fullsize": sds["size"]}),
 246                                         ctx.ShowPrgrs,
 247                                 ); err != nil {
 248                                         ctx.LogE("rx", sds, err, "copy")
 249                                         isBad = true
 250                                         goto Closing
 251                                 }
 252                                 if err = bufW.Flush(); err != nil {
 253                                         tmp.Close() // #nosec G104
 254                                         ctx.LogE("rx", sds, err, "copy")
 255                                         isBad = true
 256                                         goto Closing
 257                                 }
 258                                 if err = tmp.Sync(); err != nil {
 259                                         tmp.Close() // #nosec G104
 260                                         ctx.LogE("rx", sds, err, "copy")
 261                                         isBad = true
 262                                         goto Closing
 263                                 }
 264                                 if err = tmp.Close(); err != nil {
 265                                         ctx.LogE("rx", sds, err, "copy")
 266                                         isBad = true
 267                                         goto Closing
 268                                 }
 269                                 dstPathOrig := filepath.Join(*incoming, dst)
 270                                 dstPath := dstPathOrig
 271                                 dstPathCtr := 0
 272                                 for {
 273                                         if _, err = os.Stat(dstPath); err != nil {
 274                                                 if os.IsNotExist(err) {
 275                                                         break
 276                                                 }
 277                                                 ctx.LogE("rx", sds, err, "stat")
 278                                                 isBad = true
 279                                                 goto Closing
 280                                         }
 281                                         dstPath = dstPathOrig + "." + strconv.Itoa(dstPathCtr)
 282                                         dstPathCtr++
 283                                 }
 284                                 if err = os.Rename(tmp.Name(), dstPath); err != nil {
 285                                         ctx.LogE("rx", sds, err, "rename")
 286                                         isBad = true
 287                                 }
 288                                 if err = DirSync(*incoming); err != nil {
 289                                         ctx.LogE("rx", sds, err, "sync")
 290                                         isBad = true
 291                                 }
 292                                 delete(sds, "tmp")
 293                         }
 294                         ctx.LogI("rx", sds, "")
 295                         if !dryRun {
 296                                 if doSeen {
 297                                         if fd, err := os.Create(job.Fd.Name() + SeenSuffix); err == nil {
 298                                                 fd.Close() // #nosec G104
 299                                         }
 300                                 }
 301                                 if err = os.Remove(job.Fd.Name()); err != nil {
 302                                         ctx.LogE("rx", sds, err, "remove")
 303                                         isBad = true
 304                                 }
 305                                 if len(sendmail) > 0 && ctx.NotifyFile != nil {
 306                                         cmd := exec.Command(
 307                                                 sendmail[0],
 308                                                 append(sendmail[1:len(sendmail)], ctx.NotifyFile.To)...,
 309                                         )
 310                                         cmd.Stdin = newNotification(ctx.NotifyFile, fmt.Sprintf(
 311                                                 "File from %s: %s (%s)",
 312                                                 ctx.Neigh[*job.PktEnc.Sender].Name,
 313                                                 dst,
 314                                                 humanize.IBytes(uint64(pktSize)),
 315                                         ), nil)
 316                                         if err = cmd.Run(); err != nil {
 317                                                 ctx.LogE("rx", sds, err, "notify")
 318                                         }
 319                                 }
 320                         }
 321                 case PktTypeFreq:
 322                         if noFreq {
 323                                 goto Closing
 324                         }
 325                         src := string(pkt.Path[:int(pkt.PathLen)])
 326                         if filepath.IsAbs(src) {
 327                                 ctx.LogE("rx", sds, errors.New("non-relative source path"), "")
 328                                 isBad = true
 329                                 goto Closing
 330                         }
 331                         sds := SdsAdd(sds, SDS{"type": "freq", "src": src})
 332                         dstRaw, err := ioutil.ReadAll(pipeR)
 333                         if err != nil {
 334                                 ctx.LogE("rx", sds, err, "read")
 335                                 isBad = true
 336                                 goto Closing
 337                         }
 338                         dst := string(dstRaw)
 339                         sds["dst"] = dst
 340                         sender := ctx.Neigh[*job.PktEnc.Sender]
 341                         freqPath := sender.FreqPath
 342                         if freqPath == nil {
 343                                 ctx.LogE("rx", sds, errors.New("freqing is not allowed"), "")
 344                                 isBad = true
 345                                 goto Closing
 346                         }
 347                         if !dryRun {
 348                                 err = ctx.TxFile(
 349                                         sender,
 350                                         pkt.Nice,
 351                                         filepath.Join(*freqPath, src),
 352                                         dst,
 353                                         sender.FreqChunked,
 354                                         sender.FreqMinSize,
 355                                         sender.FreqMaxSize,
 356                                 )
 357                                 if err != nil {
 358                                         ctx.LogE("rx", sds, err, "tx file")
 359                                         isBad = true
 360                                         goto Closing
 361                                 }
 362                         }
 363                         ctx.LogI("rx", sds, "")
 364                         if !dryRun {
 365                                 if doSeen {
 366                                         if fd, err := os.Create(job.Fd.Name() + SeenSuffix); err == nil {
 367                                                 fd.Close() // #nosec G104
 368                                         }
 369                                 }
 370                                 if err = os.Remove(job.Fd.Name()); err != nil {
 371                                         ctx.LogE("rx", sds, err, "remove")
 372                                         isBad = true
 373                                 }
 374                                 if len(sendmail) > 0 && ctx.NotifyFreq != nil {
 375                                         cmd := exec.Command(
 376                                                 sendmail[0],
 377                                                 append(sendmail[1:len(sendmail)], ctx.NotifyFreq.To)...,
 378                                         )
 379                                         cmd.Stdin = newNotification(ctx.NotifyFreq, fmt.Sprintf(
 380                                                 "Freq from %s: %s", sender.Name, src,
 381                                         ), nil)
 382                                         if err = cmd.Run(); err != nil {
 383                                                 ctx.LogE("rx", sds, err, "notify")
 384                                         }
 385                                 }
 386                         }
 387                 case PktTypeTrns:
 388                         if noTrns {
 389                                 goto Closing
 390                         }
 391                         dst := new([blake2b.Size256]byte)
 392                         copy(dst[:], pkt.Path[:int(pkt.PathLen)])
 393                         nodeId := NodeId(*dst)
 394                         node, known := ctx.Neigh[nodeId]
 395                         sds := SdsAdd(sds, SDS{"type": "trns", "dst": nodeId})
 396                         if !known {
 397                                 ctx.LogE("rx", sds, errors.New("unknown node"), "")
 398                                 isBad = true
 399                                 goto Closing
 400                         }
 401                         ctx.LogD("rx", sds, "taken")
 402                         if !dryRun {
 403                                 if err = ctx.TxTrns(node, job.PktEnc.Nice, pktSize, pipeR); err != nil {
 404                                         ctx.LogE("rx", sds, err, "tx trns")
 405                                         isBad = true
 406                                         goto Closing
 407                                 }
 408                         }
 409                         ctx.LogI("rx", sds, "")
 410                         if !dryRun {
 411                                 if doSeen {
 412                                         if fd, err := os.Create(job.Fd.Name() + SeenSuffix); err == nil {
 413                                                 fd.Close() // #nosec G104
 414                                         }
 415                                 }
 416                                 if err = os.Remove(job.Fd.Name()); err != nil {
 417                                         ctx.LogE("rx", sds, err, "remove")
 418                                         isBad = true
 419                                 }
 420                         }
 421                 default:
 422                         ctx.LogE("rx", sds, errors.New("unknown type"), "")
 423                         isBad = true
 424                 }
 425         Closing:
 426                 pipeR.Close() // #nosec G104
 427         }
 428         return isBad
 429 }
 430
 431 func (ctx *Ctx) AutoToss(
 432         nodeId *NodeId,
 433         nice uint8,
 434         doSeen, noFile, noFreq, noExec, noTrns bool,
 435 ) (chan struct{}, chan bool) {
 436         finish := make(chan struct{})
 437         badCode := make(chan bool)
 438         go func() {
 439                 bad := false
 440                 for {
 441                         select {
 442                         case <-finish:
 443                                 badCode <- bad
 444                                 break
 445                         default:
 446                         }
 447                         time.Sleep(time.Second)
 448                         bad = !ctx.Toss(nodeId, nice, false, doSeen, noFile, noFreq, noExec, noTrns)
 449                 }
 450         }()
 451         return finish, badCode
 452 }