src/cmd/nncp-xfer/main.go

   1 /*
   2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
   3 Copyright (C) 2016-2022 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 // Exchange NNCP inbound and outbounds packets with external directory.
  19 package main
  20
  21 import (
  22         "bufio"
  23         "errors"
  24         "flag"
  25         "fmt"
  26         "io"
  27         "log"
  28         "os"
  29         "path/filepath"
  30
  31         "github.com/dustin/go-humanize"
  32         "go.cypherpunks.ru/nncp/v8"
  33 )
  34
  35 func usage() {
  36         fmt.Fprintf(os.Stderr, nncp.UsageHeader())
  37         fmt.Fprintf(os.Stderr, "nncp-xfer -- copy inbound and outbounds packets\n\n")
  38         fmt.Fprintf(os.Stderr, "Usage: %s [options] DIR\nOptions:\n", os.Args[0])
  39         flag.PrintDefaults()
  40 }
  41
  42 func main() {
  43         var (
  44                 cfgPath   = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
  45                 nodeRaw   = flag.String("node", "", "Process only that node")
  46                 niceRaw   = flag.String("nice", nncp.NicenessFmt(255), "Minimal required niceness")
  47                 rxOnly    = flag.Bool("rx", false, "Only receive packets")
  48                 txOnly    = flag.Bool("tx", false, "Only transfer packets")
  49                 mkdir     = flag.Bool("mkdir", false, "Create necessary outbound directories")
  50                 keep      = flag.Bool("keep", false, "Do not delete transferred packets")
  51                 spoolPath = flag.String("spool", "", "Override path to spool")
  52                 logPath   = flag.String("log", "", "Override path to logfile")
  53                 quiet     = flag.Bool("quiet", false, "Print only errors")
  54                 showPrgrs = flag.Bool("progress", false, "Force progress showing")
  55                 omitPrgrs = flag.Bool("noprogress", false, "Omit progress showing")
  56                 debug     = flag.Bool("debug", false, "Print debug messages")
  57                 version   = flag.Bool("version", false, "Print version information")
  58                 warranty  = flag.Bool("warranty", false, "Print warranty information")
  59         )
  60         log.SetFlags(log.Lshortfile)
  61         flag.Usage = usage
  62         flag.Parse()
  63         if *warranty {
  64                 fmt.Println(nncp.Warranty)
  65                 return
  66         }
  67         if *version {
  68                 fmt.Println(nncp.VersionGet())
  69                 return
  70         }
  71         if flag.NArg() != 1 {
  72                 usage()
  73                 os.Exit(1)
  74         }
  75         nice, err := nncp.NicenessParse(*niceRaw)
  76         if err != nil {
  77                 log.Fatalln(err)
  78         }
  79         if *rxOnly && *txOnly {
  80                 log.Fatalln("-rx and -tx can not be set simultaneously")
  81         }
  82
  83         ctx, err := nncp.CtxFromCmdline(
  84                 *cfgPath,
  85                 *spoolPath,
  86                 *logPath,
  87                 *quiet,
  88                 *showPrgrs,
  89                 *omitPrgrs,
  90                 *debug,
  91         )
  92         if err != nil {
  93                 log.Fatalln("Error during initialization:", err)
  94         }
  95
  96         var nodeOnly *nncp.Node
  97         if *nodeRaw != "" {
  98                 nodeOnly, err = ctx.FindNode(*nodeRaw)
  99                 if err != nil {
 100                         log.Fatalln("Invalid -node specified:", err)
 101                 }
 102         }
 103
 104         ctx.Umask()
 105         selfPath := filepath.Join(flag.Arg(0), ctx.SelfId.String())
 106         isBad := false
 107         var dir *os.File
 108         var fis []os.FileInfo
 109         var les nncp.LEs
 110         var logMsg func(les nncp.LEs) string
 111         if *txOnly {
 112                 goto Tx
 113         }
 114         les = nncp.LEs{
 115                 {K: "XX", V: string(nncp.TRx)},
 116                 {K: "Dir", V: selfPath},
 117         }
 118         logMsg = func(les nncp.LEs) string {
 119                 return "Packet transfer, received from self"
 120         }
 121         ctx.LogD("xfer-self", les, logMsg)
 122         if _, err = os.Stat(selfPath); err != nil {
 123                 if os.IsNotExist(err) {
 124                         ctx.LogD("xfer-self-no-dir", les, func(les nncp.LEs) string {
 125                                 return logMsg(les) + ": no directory"
 126                         })
 127                         goto Tx
 128                 }
 129                 ctx.LogE("xfer-self-stat", les, err, func(les nncp.LEs) string {
 130                         return logMsg(les) + ": stating"
 131                 })
 132                 isBad = true
 133                 goto Tx
 134         }
 135         dir, err = os.Open(selfPath)
 136         if err != nil {
 137                 ctx.LogE("xfer-self-open", les, err, func(les nncp.LEs) string {
 138                         return logMsg(les) + ": opening"
 139                 })
 140                 isBad = true
 141                 goto Tx
 142         }
 143         fis, err = dir.Readdir(0)
 144         dir.Close()
 145         if err != nil {
 146                 ctx.LogE("xfer-self-read", les, err, func(les nncp.LEs) string {
 147                         return logMsg(les) + ": reading"
 148                 })
 149                 isBad = true
 150                 goto Tx
 151         }
 152         for _, fi := range fis {
 153                 if !fi.IsDir() {
 154                         continue
 155                 }
 156                 nodeId, err := nncp.NodeIdFromString(fi.Name())
 157                 les := append(les, nncp.LE{K: "Node", V: fi.Name()})
 158                 logMsg := func(les nncp.LEs) string {
 159                         return "Packet transfer, received from " + ctx.NodeName(nodeId)
 160                 }
 161                 if err != nil {
 162                         ctx.LogD("xfer-rx-not-node", les, func(les nncp.LEs) string {
 163                                 return logMsg(les) + ": is not NodeId"
 164                         })
 165                         continue
 166                 }
 167                 if nodeOnly != nil && *nodeId != *nodeOnly.Id {
 168                         ctx.LogD("xfer-rx-skip", les, func(les nncp.LEs) string {
 169                                 return logMsg(les) + ": skipping"
 170                         })
 171                         continue
 172                 }
 173                 if _, known := ctx.Neigh[*nodeId]; !known {
 174                         ctx.LogD("xfer-rx-unknown", les, func(les nncp.LEs) string {
 175                                 return logMsg(les) + ": unknown"
 176                         })
 177                         continue
 178                 }
 179                 dir, err = os.Open(filepath.Join(selfPath, fi.Name()))
 180                 if err != nil {
 181                         ctx.LogE("xfer-rx-open", les, err, func(les nncp.LEs) string {
 182                                 return logMsg(les) + ": opening"
 183                         })
 184                         isBad = true
 185                         continue
 186                 }
 187                 fisInt, err := dir.Readdir(0)
 188                 dir.Close()
 189                 if err != nil {
 190                         ctx.LogE("xfer-rx-read", les, err, func(les nncp.LEs) string {
 191                                 return logMsg(les) + ": reading"
 192                         })
 193                         isBad = true
 194                         continue
 195                 }
 196                 for _, fiInt := range fisInt {
 197                         if !fi.IsDir() {
 198                                 continue
 199                         }
 200                         // Check that it is valid Base32 encoding
 201                         if _, err = nncp.NodeIdFromString(fiInt.Name()); err != nil {
 202                                 continue
 203                         }
 204                         filename := filepath.Join(dir.Name(), fiInt.Name())
 205                         les := append(les, nncp.LE{K: "File", V: filename})
 206                         logMsg := func(les nncp.LEs) string {
 207                                 return fmt.Sprintf(
 208                                         "Packet transfer, received from %s: %s",
 209                                         ctx.NodeName(nodeId), filename,
 210                                 )
 211                         }
 212                         fd, err := os.Open(filename)
 213                         if err != nil {
 214                                 ctx.LogE("xfer-rx-open", les, err, func(les nncp.LEs) string {
 215                                         return logMsg(les) + ": opening"
 216                                 })
 217                                 isBad = true
 218                                 continue
 219                         }
 220                         pktEnc, pktEncRaw, err := ctx.HdrRead(fd)
 221                         if err == nil {
 222                                 switch pktEnc.Magic {
 223                                 case nncp.MagicNNCPEv1.B:
 224                                         err = nncp.MagicNNCPEv1.TooOld()
 225                                 case nncp.MagicNNCPEv2.B:
 226                                         err = nncp.MagicNNCPEv2.TooOld()
 227                                 case nncp.MagicNNCPEv3.B:
 228                                         err = nncp.MagicNNCPEv3.TooOld()
 229                                 case nncp.MagicNNCPEv4.B:
 230                                         err = nncp.MagicNNCPEv4.TooOld()
 231                                 case nncp.MagicNNCPEv5.B:
 232                                         err = nncp.MagicNNCPEv5.TooOld()
 233                                 case nncp.MagicNNCPEv6.B:
 234                                 default:
 235                                         err = errors.New("is not an encrypted packet")
 236                                 }
 237                         }
 238                         if err != nil {
 239                                 ctx.LogD(
 240                                         "xfer-rx-not-packet",
 241                                         append(les, nncp.LE{K: "Err", V: err}),
 242                                         func(les nncp.LEs) string {
 243                                                 return logMsg(les) + ": not valid packet: " + err.Error()
 244                                         },
 245                                 )
 246                                 fd.Close()
 247                                 continue
 248                         }
 249                         if pktEnc.Nice > nice {
 250                                 ctx.LogD("xfer-rx-too-nice", les, func(les nncp.LEs) string {
 251                                         return logMsg(les) + ": too nice"
 252                                 })
 253                                 fd.Close()
 254                                 continue
 255                         }
 256                         les = append(les, nncp.LE{K: "Size", V: fiInt.Size()})
 257                         logMsg = func(les nncp.LEs) string {
 258                                 return fmt.Sprintf(
 259                                         "Packet transfer, received from %s: %s (%s)",
 260                                         ctx.NodeName(nodeId), filename,
 261                                         humanize.IBytes(uint64(fiInt.Size())),
 262                                 )
 263                         }
 264                         if !ctx.IsEnoughSpace(fiInt.Size()) {
 265                                 ctx.LogE("xfer-rx", les, errors.New("is not enough space"), logMsg)
 266                                 fd.Close()
 267                                 continue
 268                         }
 269                         if _, err = fd.Seek(0, io.SeekStart); err != nil {
 270                                 log.Fatalln(err)
 271                         }
 272                         tmp, err := ctx.NewTmpFileWHash()
 273                         if err != nil {
 274                                 log.Fatalln(err)
 275                         }
 276                         r, w := io.Pipe()
 277                         go func() {
 278                                 _, err := io.CopyN(w, bufio.NewReader(fd), fiInt.Size())
 279                                 if err == nil {
 280                                         err = w.Close()
 281                                 }
 282                                 if err != nil {
 283                                         ctx.LogE("xfer-rx", les, err, logMsg)
 284                                         w.CloseWithError(err)
 285                                 }
 286                         }()
 287                         _, err = nncp.CopyProgressed(
 288                                 tmp.W, r, "Rx",
 289                                 append(
 290                                         les,
 291                                         nncp.LE{K: "Pkt", V: filename},
 292                                         nncp.LE{K: "FullSize", V: fiInt.Size()},
 293                                 ),
 294                                 ctx.ShowPrgrs,
 295                         )
 296                         fd.Close()
 297                         if err != nil {
 298                                 ctx.LogE("xfer-rx", les, err, logMsg)
 299                                 tmp.Cancel()
 300                                 isBad = true
 301                                 continue
 302                         }
 303                         if err = tmp.W.Flush(); err != nil {
 304                                 ctx.LogE("xfer-rx", les, err, logMsg)
 305                                 tmp.Cancel()
 306                                 isBad = true
 307                                 continue
 308                         }
 309                         if tmp.Checksum() != fiInt.Name() {
 310                                 ctx.LogE("xfer-rx", les, errors.New("checksum mismatch"), logMsg)
 311                                 tmp.Cancel()
 312                                 isBad = true
 313                                 continue
 314                         }
 315                         if err = tmp.Commit(filepath.Join(
 316                                 ctx.Spool,
 317                                 nodeId.String(),
 318                                 string(nncp.TRx),
 319                         )); err != nil {
 320                                 log.Fatalln(err)
 321                         }
 322                         ctx.LogI("xfer-rx", les, logMsg)
 323                         if !*keep {
 324                                 if err = os.Remove(filename); err != nil {
 325                                         ctx.LogE("xfer-rx-remove", les, err, logMsg)
 326                                         isBad = true
 327                                 }
 328                         }
 329                         if ctx.HdrUsage {
 330                                 ctx.HdrWrite(pktEncRaw, filepath.Join(
 331                                         ctx.Spool,
 332                                         nodeId.String(),
 333                                         string(nncp.TRx),
 334                                         tmp.Checksum(),
 335                                 ))
 336                         }
 337                 }
 338         }
 339
 340 Tx:
 341         if *rxOnly {
 342                 if isBad {
 343                         os.Exit(1)
 344                 }
 345                 return
 346         }
 347         for nodeId := range ctx.Neigh {
 348                 les := nncp.LEs{{K: "XX", V: string(nncp.TTx)}, {K: "Node", V: nodeId}}
 349                 logMsg := func(les nncp.LEs) string {
 350                         return "Packet transfer, sent to " + ctx.NodeName(&nodeId)
 351                 }
 352                 if nodeOnly != nil && nodeId != *nodeOnly.Id {
 353                         ctx.LogD("xfer-tx-skip", les, func(les nncp.LEs) string {
 354                                 return logMsg(les) + ": skipping"
 355                         })
 356                         continue
 357                 }
 358                 dirLock, err := ctx.LockDir(&nodeId, string(nncp.TTx))
 359                 if err != nil {
 360                         continue
 361                 }
 362                 nodePath := filepath.Join(flag.Arg(0), nodeId.String())
 363                 les = append(les, nncp.LE{K: "Dir", V: nodePath})
 364                 logMsg = func(les nncp.LEs) string {
 365                         return fmt.Sprintf(
 366                                 "Packet transfer, sent to %s: directory %s",
 367                                 ctx.NodeName(&nodeId), nodePath,
 368                         )
 369                 }
 370                 _, err = os.Stat(nodePath)
 371                 if err != nil {
 372                         if os.IsNotExist(err) {
 373                                 ctx.LogD("xfer-tx-not-exist", les, func(les nncp.LEs) string {
 374                                         return logMsg(les) + ": does not exist"
 375                                 })
 376                                 if !*mkdir {
 377                                         ctx.UnlockDir(dirLock)
 378                                         continue
 379                                 }
 380                                 if err = os.Mkdir(nodePath, os.FileMode(0777)); err != nil {
 381                                         ctx.UnlockDir(dirLock)
 382                                         ctx.LogE("xfer-tx-mkdir", les, err, logMsg)
 383                                         isBad = true
 384                                         continue
 385                                 }
 386                         } else {
 387                                 ctx.UnlockDir(dirLock)
 388                                 ctx.LogE("xfer-tx", les, err, logMsg)
 389                                 isBad = true
 390                                 continue
 391                         }
 392                 }
 393                 dstPath := filepath.Join(nodePath, ctx.SelfId.String())
 394                 les[len(les)-1].V = dstPath
 395                 logMsg = func(les nncp.LEs) string {
 396                         return fmt.Sprintf(
 397                                 "Packet transfer, sent to %s: directory %s",
 398                                 ctx.NodeName(&nodeId), dstPath,
 399                         )
 400                 }
 401                 _, err = os.Stat(dstPath)
 402                 if err != nil {
 403                         if os.IsNotExist(err) {
 404                                 if err = os.Mkdir(dstPath, os.FileMode(0777)); err != nil {
 405                                         ctx.UnlockDir(dirLock)
 406                                         ctx.LogE("xfer-tx-mkdir", les, err, logMsg)
 407                                         isBad = true
 408                                         continue
 409                                 }
 410                         } else {
 411                                 ctx.UnlockDir(dirLock)
 412                                 ctx.LogE("xfer-tx", les, err, logMsg)
 413                                 isBad = true
 414                                 continue
 415                         }
 416                 }
 417                 les = les[:len(les)-1]
 418                 for job := range ctx.Jobs(&nodeId, nncp.TTx) {
 419                         pktName := filepath.Base(job.Path)
 420                         les := append(les, nncp.LE{K: "Pkt", V: pktName})
 421                         logMsg = func(les nncp.LEs) string {
 422                                 return fmt.Sprintf(
 423                                         "Packet transfer, sent to %s: %s",
 424                                         ctx.NodeName(&nodeId), pktName,
 425                                 )
 426                         }
 427                         if job.PktEnc.Nice > nice {
 428                                 ctx.LogD("xfer-tx-too-nice", les, func(les nncp.LEs) string {
 429                                         return logMsg(les) + ": too nice"
 430                                 })
 431                                 continue
 432                         }
 433                         if _, err = os.Stat(filepath.Join(dstPath, pktName)); err == nil || !os.IsNotExist(err) {
 434                                 ctx.LogD("xfer-tx-exists", les, func(les nncp.LEs) string {
 435                                         return logMsg(les) + ": already exists"
 436                                 })
 437                                 continue
 438                         }
 439                         if _, err = os.Stat(filepath.Join(
 440                                 dstPath, nncp.SeenDir, pktName,
 441                         )); err == nil || !os.IsNotExist(err) {
 442                                 ctx.LogD("xfer-tx-seen", les, func(les nncp.LEs) string {
 443                                         return logMsg(les) + ": already seen"
 444                                 })
 445                                 continue
 446                         }
 447                         tmp, err := nncp.TempFile(dstPath, "xfer")
 448                         if err != nil {
 449                                 ctx.LogE("xfer-tx-mktemp", les, err, func(les nncp.LEs) string {
 450                                         return logMsg(les) + ": mktemp"
 451                                 })
 452                                 isBad = true
 453                                 break
 454                         }
 455                         les = append(les, nncp.LE{K: "Tmp", V: tmp.Name()})
 456                         ctx.LogD("xfer-tx-tmp-create", les, func(les nncp.LEs) string {
 457                                 return fmt.Sprintf("%s: temporary %s created", logMsg(les), tmp.Name())
 458                         })
 459                         fd, err := os.Open(job.Path)
 460                         if err != nil {
 461                                 ctx.LogE("xfer-tx-open", les, err, func(les nncp.LEs) string {
 462                                         return logMsg(les) + ": opening"
 463                                 })
 464                                 tmp.Close()
 465                                 isBad = true
 466                                 continue
 467                         }
 468                         bufW := bufio.NewWriter(tmp)
 469                         copied, err := nncp.CopyProgressed(
 470                                 bufW, bufio.NewReader(fd), "Tx",
 471                                 append(les, nncp.LE{K: "FullSize", V: job.Size}),
 472                                 ctx.ShowPrgrs,
 473                         )
 474                         fd.Close()
 475                         if err != nil {
 476                                 ctx.LogE("xfer-tx-copy", les, err, func(les nncp.LEs) string {
 477                                         return logMsg(les) + ": copying"
 478                                 })
 479                                 tmp.Close()
 480                                 isBad = true
 481                                 continue
 482                         }
 483                         if err = bufW.Flush(); err != nil {
 484                                 tmp.Close()
 485                                 ctx.LogE("xfer-tx-flush", les, err, func(les nncp.LEs) string {
 486                                         return logMsg(les) + ": flushing"
 487                                 })
 488                                 isBad = true
 489                                 continue
 490                         }
 491                         if !nncp.NoSync {
 492                                 if err = tmp.Sync(); err != nil {
 493                                         tmp.Close()
 494                                         ctx.LogE("xfer-tx-sync", les, err, func(les nncp.LEs) string {
 495                                                 return logMsg(les) + ": syncing"
 496                                         })
 497                                         isBad = true
 498                                         continue
 499                                 }
 500                         }
 501                         if err = tmp.Close(); err != nil {
 502                                 ctx.LogE("xfer-tx-close", les, err, func(les nncp.LEs) string {
 503                                         return logMsg(les) + ": closing"
 504                                 })
 505                         }
 506                         if err = os.Rename(tmp.Name(), filepath.Join(dstPath, pktName)); err != nil {
 507                                 ctx.LogE("xfer-tx-rename", les, err, func(les nncp.LEs) string {
 508                                         return logMsg(les) + ": renaming"
 509                                 })
 510                                 isBad = true
 511                                 continue
 512                         }
 513                         if err = nncp.DirSync(dstPath); err != nil {
 514                                 ctx.LogE("xfer-tx-dirsync", les, err, func(les nncp.LEs) string {
 515                                         return logMsg(les) + ": dirsyncing"
 516                                 })
 517                                 isBad = true
 518                                 continue
 519                         }
 520                         os.Remove(filepath.Join(dstPath, pktName+".part"))
 521                         les = les[:len(les)-1]
 522                         ctx.LogI(
 523                                 "xfer-tx",
 524                                 append(les, nncp.LE{K: "Size", V: copied}),
 525                                 func(les nncp.LEs) string {
 526                                         return fmt.Sprintf(
 527                                                 "%s (%s)", logMsg(les), humanize.IBytes(uint64(copied)),
 528                                         )
 529                                 },
 530                         )
 531                         if !*keep {
 532                                 if err = os.Remove(job.Path); err != nil {
 533                                         ctx.LogE("xfer-tx-remove", les, err, func(les nncp.LEs) string {
 534                                                 return logMsg(les) + ": removing"
 535                                         })
 536                                         isBad = true
 537                                 } else if ctx.HdrUsage {
 538                                         os.Remove(nncp.JobPath2Hdr(job.Path))
 539                                 }
 540                         }
 541                 }
 542                 ctx.UnlockDir(dirLock)
 543         }
 544         if isBad {
 545                 os.Exit(1)
 546         }
 547 }