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