src/cmd/nncp-xfer/main.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 // 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                                 default:
 233                                         err = errors.New("is not an encrypted packet")
 234                                 }
 235                         }
 236                         if err != nil {
 237                                 ctx.LogD(
 238                                         "xfer-rx-not-packet",
 239                                         append(les, nncp.LE{K: "Err", V: err}),
 240                                         func(les nncp.LEs) string {
 241                                                 return logMsg(les) + ": not valid packet: " + err.Error()
 242                                         },
 243                                 )
 244                                 fd.Close()
 245                                 continue
 246                         }
 247                         if pktEnc.Nice > nice {
 248                                 ctx.LogD("xfer-rx-too-nice", les, func(les nncp.LEs) string {
 249                                         return logMsg(les) + ": too nice"
 250                                 })
 251                                 fd.Close()
 252                                 continue
 253                         }
 254                         les = append(les, nncp.LE{K: "Size", V: fiInt.Size()})
 255                         logMsg = func(les nncp.LEs) string {
 256                                 return fmt.Sprintf(
 257                                         "Packet transfer, received from %s: %s (%s)",
 258                                         ctx.NodeName(nodeId), filename,
 259                                         humanize.IBytes(uint64(fiInt.Size())),
 260                                 )
 261                         }
 262                         if !ctx.IsEnoughSpace(fiInt.Size()) {
 263                                 ctx.LogE("xfer-rx", les, errors.New("is not enough space"), logMsg)
 264                                 fd.Close()
 265                                 continue
 266                         }
 267                         if _, err = fd.Seek(0, 0); err != nil {
 268                                 log.Fatalln(err)
 269                         }
 270                         tmp, err := ctx.NewTmpFileWHash()
 271                         if err != nil {
 272                                 log.Fatalln(err)
 273                         }
 274                         r, w := io.Pipe()
 275                         go func() {
 276                                 _, err := io.CopyN(w, bufio.NewReader(fd), fiInt.Size())
 277                                 if err == nil {
 278                                         err = w.Close()
 279                                 }
 280                                 if err != nil {
 281                                         ctx.LogE("xfer-rx", les, err, logMsg)
 282                                         w.CloseWithError(err)
 283                                 }
 284                         }()
 285                         if _, err = nncp.CopyProgressed(
 286                                 tmp.W, r, "Rx",
 287                                 append(
 288                                         les,
 289                                         nncp.LE{K: "Pkt", V: filename},
 290                                         nncp.LE{K: "FullSize", V: fiInt.Size()},
 291                                 ),
 292                                 ctx.ShowPrgrs,
 293                         ); err != nil {
 294                                 ctx.LogE("xfer-rx", les, err, logMsg)
 295                                 isBad = true
 296                         }
 297                         fd.Close()
 298                         if isBad {
 299                                 tmp.Cancel()
 300                                 continue
 301                         }
 302                         if err = tmp.Commit(filepath.Join(
 303                                 ctx.Spool,
 304                                 nodeId.String(),
 305                                 string(nncp.TRx),
 306                         )); err != nil {
 307                                 log.Fatalln(err)
 308                         }
 309                         ctx.LogI("xfer-rx", les, logMsg)
 310                         if !*keep {
 311                                 if err = os.Remove(filename); err != nil {
 312                                         ctx.LogE("xfer-rx-remove", les, err, logMsg)
 313                                         isBad = true
 314                                 }
 315                         }
 316                         if ctx.HdrUsage {
 317                                 ctx.HdrWrite(pktEncRaw, filepath.Join(
 318                                         ctx.Spool,
 319                                         nodeId.String(),
 320                                         string(nncp.TRx),
 321                                         tmp.Checksum(),
 322                                 ))
 323                         }
 324                 }
 325         }
 326
 327 Tx:
 328         if *rxOnly {
 329                 if isBad {
 330                         os.Exit(1)
 331                 }
 332                 return
 333         }
 334         for nodeId := range ctx.Neigh {
 335                 les := nncp.LEs{{K: "XX", V: string(nncp.TTx)}, {K: "Node", V: nodeId}}
 336                 logMsg := func(les nncp.LEs) string {
 337                         return "Packet transfer, sent to " + ctx.NodeName(&nodeId)
 338                 }
 339                 if nodeOnly != nil && nodeId != *nodeOnly.Id {
 340                         ctx.LogD("xfer-tx-skip", les, func(les nncp.LEs) string {
 341                                 return logMsg(les) + ": skipping"
 342                         })
 343                         continue
 344                 }
 345                 dirLock, err := ctx.LockDir(&nodeId, string(nncp.TTx))
 346                 if err != nil {
 347                         continue
 348                 }
 349                 nodePath := filepath.Join(flag.Arg(0), nodeId.String())
 350                 les = append(les, nncp.LE{K: "Dir", V: nodePath})
 351                 logMsg = func(les nncp.LEs) string {
 352                         return fmt.Sprintf(
 353                                 "Packet transfer, sent to %s: directory %s",
 354                                 ctx.NodeName(&nodeId), nodePath,
 355                         )
 356                 }
 357                 _, err = os.Stat(nodePath)
 358                 if err != nil {
 359                         if os.IsNotExist(err) {
 360                                 ctx.LogD("xfer-tx-not-exist", les, func(les nncp.LEs) string {
 361                                         return logMsg(les) + ": does not exist"
 362                                 })
 363                                 if !*mkdir {
 364                                         ctx.UnlockDir(dirLock)
 365                                         continue
 366                                 }
 367                                 if err = os.Mkdir(nodePath, os.FileMode(0777)); err != nil {
 368                                         ctx.UnlockDir(dirLock)
 369                                         ctx.LogE("xfer-tx-mkdir", les, err, logMsg)
 370                                         isBad = true
 371                                         continue
 372                                 }
 373                         } else {
 374                                 ctx.UnlockDir(dirLock)
 375                                 ctx.LogE("xfer-tx", les, err, logMsg)
 376                                 isBad = true
 377                                 continue
 378                         }
 379                 }
 380                 dstPath := filepath.Join(nodePath, ctx.SelfId.String())
 381                 les[len(les)-1].V = dstPath
 382                 logMsg = func(les nncp.LEs) string {
 383                         return fmt.Sprintf(
 384                                 "Packet transfer, sent to %s: directory %s",
 385                                 ctx.NodeName(&nodeId), dstPath,
 386                         )
 387                 }
 388                 _, err = os.Stat(dstPath)
 389                 if err != nil {
 390                         if os.IsNotExist(err) {
 391                                 if err = os.Mkdir(dstPath, os.FileMode(0777)); err != nil {
 392                                         ctx.UnlockDir(dirLock)
 393                                         ctx.LogE("xfer-tx-mkdir", les, err, logMsg)
 394                                         isBad = true
 395                                         continue
 396                                 }
 397                         } else {
 398                                 ctx.UnlockDir(dirLock)
 399                                 ctx.LogE("xfer-tx", les, err, logMsg)
 400                                 isBad = true
 401                                 continue
 402                         }
 403                 }
 404                 les = les[:len(les)-1]
 405                 for job := range ctx.Jobs(&nodeId, nncp.TTx) {
 406                         pktName := filepath.Base(job.Path)
 407                         les := append(les, nncp.LE{K: "Pkt", V: pktName})
 408                         logMsg = func(les nncp.LEs) string {
 409                                 return fmt.Sprintf(
 410                                         "Packet transfer, sent to %s: %s",
 411                                         ctx.NodeName(&nodeId), pktName,
 412                                 )
 413                         }
 414                         if job.PktEnc.Nice > nice {
 415                                 ctx.LogD("xfer-tx-too-nice", les, func(les nncp.LEs) string {
 416                                         return logMsg(les) + ": too nice"
 417                                 })
 418                                 continue
 419                         }
 420                         if _, err = os.Stat(filepath.Join(dstPath, pktName)); err == nil || !os.IsNotExist(err) {
 421                                 ctx.LogD("xfer-tx-exists", les, func(les nncp.LEs) string {
 422                                         return logMsg(les) + ": already exists"
 423                                 })
 424                                 continue
 425                         }
 426                         if _, err = os.Stat(filepath.Join(
 427                                 dstPath, nncp.SeenDir, pktName,
 428                         )); err == nil || !os.IsNotExist(err) {
 429                                 ctx.LogD("xfer-tx-seen", les, func(les nncp.LEs) string {
 430                                         return logMsg(les) + ": already seen"
 431                                 })
 432                                 continue
 433                         }
 434                         tmp, err := nncp.TempFile(dstPath, "xfer")
 435                         if err != nil {
 436                                 ctx.LogE("xfer-tx-mktemp", les, err, func(les nncp.LEs) string {
 437                                         return logMsg(les) + ": mktemp"
 438                                 })
 439                                 isBad = true
 440                                 break
 441                         }
 442                         les = append(les, nncp.LE{K: "Tmp", V: tmp.Name()})
 443                         ctx.LogD("xfer-tx-tmp-create", les, func(les nncp.LEs) string {
 444                                 return fmt.Sprintf("%s: temporary %s created", logMsg(les), tmp.Name())
 445                         })
 446                         fd, err := os.Open(job.Path)
 447                         if err != nil {
 448                                 ctx.LogE("xfer-tx-open", les, err, func(les nncp.LEs) string {
 449                                         return logMsg(les) + ": opening"
 450                                 })
 451                                 tmp.Close()
 452                                 isBad = true
 453                                 continue
 454                         }
 455                         bufW := bufio.NewWriter(tmp)
 456                         copied, err := nncp.CopyProgressed(
 457                                 bufW, bufio.NewReader(fd), "Tx",
 458                                 append(les, nncp.LE{K: "FullSize", V: job.Size}),
 459                                 ctx.ShowPrgrs,
 460                         )
 461                         fd.Close()
 462                         if err != nil {
 463                                 ctx.LogE("xfer-tx-copy", les, err, func(les nncp.LEs) string {
 464                                         return logMsg(les) + ": copying"
 465                                 })
 466                                 tmp.Close()
 467                                 isBad = true
 468                                 continue
 469                         }
 470                         if err = bufW.Flush(); err != nil {
 471                                 tmp.Close()
 472                                 ctx.LogE("xfer-tx-flush", les, err, func(les nncp.LEs) string {
 473                                         return logMsg(les) + ": flushing"
 474                                 })
 475                                 isBad = true
 476                                 continue
 477                         }
 478                         if err = tmp.Sync(); err != nil {
 479                                 tmp.Close()
 480                                 ctx.LogE("xfer-tx-sync", les, err, func(les nncp.LEs) string {
 481                                         return logMsg(les) + ": syncing"
 482                                 })
 483                                 isBad = true
 484                                 continue
 485                         }
 486                         if err = tmp.Close(); err != nil {
 487                                 ctx.LogE("xfer-tx-close", les, err, func(les nncp.LEs) string {
 488                                         return logMsg(les) + ": closing"
 489                                 })
 490                         }
 491                         if err = os.Rename(tmp.Name(), filepath.Join(dstPath, pktName)); err != nil {
 492                                 ctx.LogE("xfer-tx-rename", les, err, func(les nncp.LEs) string {
 493                                         return logMsg(les) + ": renaming"
 494                                 })
 495                                 isBad = true
 496                                 continue
 497                         }
 498                         if err = nncp.DirSync(dstPath); err != nil {
 499                                 ctx.LogE("xfer-tx-dirsync", les, err, func(les nncp.LEs) string {
 500                                         return logMsg(les) + ": dirsyncing"
 501                                 })
 502                                 isBad = true
 503                                 continue
 504                         }
 505                         os.Remove(filepath.Join(dstPath, pktName+".part"))
 506                         les = les[:len(les)-1]
 507                         ctx.LogI(
 508                                 "xfer-tx",
 509                                 append(les, nncp.LE{K: "Size", V: copied}),
 510                                 func(les nncp.LEs) string {
 511                                         return fmt.Sprintf(
 512                                                 "%s (%s)", logMsg(les), humanize.IBytes(uint64(copied)),
 513                                         )
 514                                 },
 515                         )
 516                         if !*keep {
 517                                 if err = os.Remove(job.Path); err != nil {
 518                                         ctx.LogE("xfer-tx-remove", les, err, func(les nncp.LEs) string {
 519                                                 return logMsg(les) + ": removing"
 520                                         })
 521                                         isBad = true
 522                                 } else if ctx.HdrUsage {
 523                                         os.Remove(nncp.JobPath2Hdr(job.Path))
 524                                 }
 525                         }
 526                 }
 527                 ctx.UnlockDir(dirLock)
 528         }
 529         if isBad {
 530                 os.Exit(1)
 531         }
 532 }