src/cmd/nncp-bundle/main.go

   1 /*
   2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
   3 Copyright (C) 2016-2023 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 // Create/digest stream of NNCP encrypted packets.
  19 package main
  20
  21 import (
  22         "archive/tar"
  23         "bufio"
  24         "bytes"
  25         "errors"
  26         "flag"
  27         "fmt"
  28         "io"
  29         "io/fs"
  30         "log"
  31         "os"
  32         "path/filepath"
  33         "strings"
  34
  35         xdr "github.com/davecgh/go-xdr/xdr2"
  36         "github.com/dustin/go-humanize"
  37         "go.cypherpunks.ru/nncp/v8"
  38 )
  39
  40 func usage() {
  41         fmt.Fprint(os.Stderr, "nncp-bundle -- Create/digest stream of NNCP encrypted packets\n\n")
  42         fmt.Fprintf(os.Stderr, "Usage: %s [options] -tx [-delete] NODE [NODE ...] > ...\n", os.Args[0])
  43         fmt.Fprintf(os.Stderr, "       %s [options] -rx -delete [-dryrun] [NODE ...] < ...\n", os.Args[0])
  44         fmt.Fprintf(os.Stderr, "       %s [options] -rx [-check] [-dryrun] [NODE ...] < ...\n", os.Args[0])
  45         fmt.Fprintln(os.Stderr, "Options:")
  46         flag.PrintDefaults()
  47 }
  48
  49 func main() {
  50         var (
  51                 cfgPath   = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
  52                 niceRaw   = flag.String("nice", nncp.NicenessFmt(255), "Minimal required niceness")
  53                 doRx      = flag.Bool("rx", false, "Receive packets")
  54                 doTx      = flag.Bool("tx", false, "Transfer packets")
  55                 doDelete  = flag.Bool("delete", false, "Delete transferred packets")
  56                 doCheck   = flag.Bool("check", false, "Check integrity while receiving")
  57                 dryRun    = flag.Bool("dryrun", false, "Do no writes")
  58                 spoolPath = flag.String("spool", "", "Override path to spool")
  59                 logPath   = flag.String("log", "", "Override path to logfile")
  60                 quiet     = flag.Bool("quiet", false, "Print only errors")
  61                 showPrgrs = flag.Bool("progress", false, "Force progress showing")
  62                 omitPrgrs = flag.Bool("noprogress", false, "Omit progress showing")
  63                 debug     = flag.Bool("debug", false, "Print debug messages")
  64                 version   = flag.Bool("version", false, "Print version information")
  65                 warranty  = flag.Bool("warranty", false, "Print warranty information")
  66         )
  67         log.SetFlags(log.Lshortfile)
  68         flag.Usage = usage
  69         flag.Parse()
  70         if *warranty {
  71                 fmt.Println(nncp.Warranty)
  72                 return
  73         }
  74         if *version {
  75                 fmt.Println(nncp.VersionGet())
  76                 return
  77         }
  78         nice, err := nncp.NicenessParse(*niceRaw)
  79         if err != nil {
  80                 log.Fatalln(err)
  81         }
  82         if *doRx && *doTx {
  83                 log.Fatalln("-rx and -tx can not be set simultaneously")
  84         }
  85         if !*doRx && !*doTx {
  86                 log.Fatalln("At least one of -rx and -tx must be specified")
  87         }
  88
  89         ctx, err := nncp.CtxFromCmdline(
  90                 *cfgPath,
  91                 *spoolPath,
  92                 *logPath,
  93                 *quiet,
  94                 *showPrgrs,
  95                 *omitPrgrs,
  96                 *debug,
  97         )
  98         if err != nil {
  99                 log.Fatalln("Error during initialization:", err)
 100         }
 101
 102         nodeIds := make(map[nncp.NodeId]struct{}, flag.NArg())
 103         for i := 0; i < flag.NArg(); i++ {
 104                 node, err := ctx.FindNode(flag.Arg(i))
 105                 if err != nil {
 106                         log.Fatalln("Invalid node specified:", err)
 107                 }
 108                 nodeIds[*node.Id] = struct{}{}
 109         }
 110
 111         ctx.Umask()
 112
 113         if *doTx {
 114                 var pktName string
 115                 bufStdout := bufio.NewWriter(os.Stdout)
 116                 tarWr := tar.NewWriter(bufStdout)
 117                 for nodeId := range nodeIds {
 118                         for job := range ctx.Jobs(&nodeId, nncp.TTx) {
 119                                 pktName = filepath.Base(job.Path)
 120                                 les := nncp.LEs{
 121                                         {K: "XX", V: string(nncp.TTx)},
 122                                         {K: "Node", V: nodeId.String()},
 123                                         {K: "Pkt", V: pktName},
 124                                 }
 125                                 if job.PktEnc.Nice > nice {
 126                                         ctx.LogD("bundle-tx-too-nice", les, func(les nncp.LEs) string {
 127                                                 return fmt.Sprintf(
 128                                                         "Bundle transfer %s/tx/%s: too nice %s",
 129                                                         ctx.NodeName(&nodeId),
 130                                                         pktName,
 131                                                         nncp.NicenessFmt(job.PktEnc.Nice),
 132                                                 )
 133                                         })
 134                                         continue
 135                                 }
 136                                 fd, err := os.Open(job.Path)
 137                                 if err != nil {
 138                                         log.Fatalln("Error during opening:", err)
 139                                 }
 140                                 if err = tarWr.WriteHeader(&tar.Header{
 141                                         Format:   tar.FormatUSTAR,
 142                                         Name:     nncp.NNCPBundlePrefix,
 143                                         Mode:     0700,
 144                                         Typeflag: tar.TypeDir,
 145                                 }); err != nil {
 146                                         log.Fatalln("Error writing tar header:", err)
 147                                 }
 148                                 if err = tarWr.WriteHeader(&tar.Header{
 149                                         Format: tar.FormatPAX,
 150                                         Name: strings.Join([]string{
 151                                                 nncp.NNCPBundlePrefix,
 152                                                 nodeId.String(),
 153                                                 ctx.SelfId.String(),
 154                                                 pktName,
 155                                         }, "/"),
 156                                         Mode:     0400,
 157                                         Size:     job.Size,
 158                                         Typeflag: tar.TypeReg,
 159                                 }); err != nil {
 160                                         log.Fatalln("Error writing tar header:", err)
 161                                 }
 162                                 if _, err = nncp.CopyProgressed(
 163                                         tarWr, bufio.NewReaderSize(fd, nncp.MTHBlockSize), "Tx",
 164                                         append(les, nncp.LEs{
 165                                                 {K: "Pkt", V: nncp.Base32Codec.EncodeToString(job.HshValue[:])},
 166                                                 {K: "FullSize", V: job.Size},
 167                                         }...),
 168                                         ctx.ShowPrgrs,
 169                                 ); err != nil {
 170                                         log.Fatalln("Error during copying to tar:", err)
 171                                 }
 172                                 if err = fd.Close(); err != nil {
 173                                         log.Fatalln("Error during closing:", err)
 174                                 }
 175                                 if err = tarWr.Flush(); err != nil {
 176                                         log.Fatalln("Error during tar flushing:", err)
 177                                 }
 178                                 if err = bufStdout.Flush(); err != nil {
 179                                         log.Fatalln("Error during stdout flushing:", err)
 180                                 }
 181                                 if *doDelete {
 182                                         if err = os.Remove(job.Path); err != nil {
 183                                                 log.Fatalln("Error during deletion:", err)
 184                                         } else if ctx.HdrUsage {
 185                                                 os.Remove(nncp.JobPath2Hdr(job.Path))
 186                                         }
 187                                 }
 188                                 ctx.LogI(
 189                                         "bundle-tx",
 190                                         append(les, nncp.LE{K: "Size", V: job.Size}),
 191                                         func(les nncp.LEs) string {
 192                                                 return fmt.Sprintf(
 193                                                         "Bundle transfer, sent to node %s %s (%s)",
 194                                                         ctx.NodeName(&nodeId),
 195                                                         pktName,
 196                                                         humanize.IBytes(uint64(job.Size)),
 197                                                 )
 198                                         },
 199                                 )
 200                         }
 201                 }
 202                 if err = tarWr.Close(); err != nil {
 203                         log.Fatalln("Error during tar closing:", err)
 204                 }
 205         } else {
 206                 bufStdin := bufio.NewReaderSize(os.Stdin, nncp.MTHBlockSize*2)
 207                 pktEncBuf := make([]byte, nncp.PktEncOverhead)
 208                 var pktEnc *nncp.PktEnc
 209                 for {
 210                         peeked, err := bufStdin.Peek(nncp.MTHBlockSize)
 211                         if err != nil && err != io.EOF {
 212                                 log.Fatalln("Error during reading:", err)
 213                         }
 214                         prefixIdx := bytes.Index(peeked, []byte(nncp.NNCPBundlePrefix))
 215                         if prefixIdx == -1 {
 216                                 if err == io.EOF {
 217                                         break
 218                                 }
 219                                 bufStdin.Discard(bufStdin.Buffered() - (len(nncp.NNCPBundlePrefix) - 1))
 220                                 continue
 221                         }
 222                         if _, err = bufStdin.Discard(prefixIdx); err != nil {
 223                                 panic(err)
 224                         }
 225                         tarR := tar.NewReader(bufStdin)
 226                         entry, err := tarR.Next()
 227                         if err != nil {
 228                                 if err != io.EOF {
 229                                         ctx.LogD(
 230                                                 "bundle-rx-read-tar",
 231                                                 nncp.LEs{{K: "XX", V: string(nncp.TRx)}, {K: "Err", V: err}},
 232                                                 func(les nncp.LEs) string {
 233                                                         return "Bundle transfer rx: reading tar"
 234                                                 },
 235                                         )
 236                                 }
 237                                 continue
 238                         }
 239                         if entry.Typeflag != tar.TypeDir {
 240                                 ctx.LogD(
 241                                         "bundle-rx-read-tar",
 242                                         nncp.LEs{
 243                                                 {K: "XX", V: string(nncp.TRx)},
 244                                                 {K: "Err", V: errors.New("expected NNCP/")},
 245                                         },
 246                                         func(les nncp.LEs) string {
 247                                                 return "Bundle transfer rx: reading tar"
 248                                         },
 249                                 )
 250                                 continue
 251                         }
 252                         entry, err = tarR.Next()
 253                         if err != nil {
 254                                 if err != io.EOF {
 255                                         ctx.LogD(
 256                                                 "bundle-rx-read-tar",
 257                                                 nncp.LEs{{K: "XX", V: string(nncp.TRx)}, {K: "Err", V: err}},
 258                                                 func(les nncp.LEs) string {
 259                                                         return "Bundle transfer rx: reading tar"
 260                                                 },
 261                                         )
 262                                 }
 263                                 continue
 264                         }
 265                         les := nncp.LEs{{K: "XX", V: string(nncp.TRx)}, {K: "Pkt", V: entry.Name}}
 266                         logMsg := func(les nncp.LEs) string {
 267                                 return "Bundle transfer rx/" + entry.Name
 268                         }
 269                         if entry.Size < nncp.PktEncOverhead {
 270                                 ctx.LogD("bundle-rx-too-small", les, func(les nncp.LEs) string {
 271                                         return logMsg(les) + ": too small packet"
 272                                 })
 273                                 continue
 274                         }
 275                         if !ctx.IsEnoughSpace(entry.Size) {
 276                                 ctx.LogE("bundle-rx", les, errors.New("not enough spool space"), logMsg)
 277                                 continue
 278                         }
 279                         pktName := filepath.Base(entry.Name)
 280                         if _, err = nncp.Base32Codec.DecodeString(pktName); err != nil {
 281                                 ctx.LogD(
 282                                         "bundle-rx",
 283                                         append(les, nncp.LE{K: "Err", V: "bad packet name"}),
 284                                         logMsg,
 285                                 )
 286                                 continue
 287                         }
 288                         if _, err = io.ReadFull(tarR, pktEncBuf); err != nil {
 289                                 ctx.LogD(
 290                                         "bundle-rx",
 291                                         append(les, nncp.LE{K: "Err", V: err}),
 292                                         logMsg,
 293                                 )
 294                                 continue
 295                         }
 296                         if _, err = xdr.Unmarshal(bytes.NewReader(pktEncBuf), &pktEnc); err != nil {
 297                                 ctx.LogD(
 298                                         "bundle-rx",
 299                                         append(les, nncp.LE{K: "Err", V: "Bad packet structure"}),
 300                                         logMsg,
 301                                 )
 302                                 continue
 303                         }
 304                         switch pktEnc.Magic {
 305                         case nncp.MagicNNCPEv1.B:
 306                                 err = nncp.MagicNNCPEv1.TooOld()
 307                         case nncp.MagicNNCPEv2.B:
 308                                 err = nncp.MagicNNCPEv2.TooOld()
 309                         case nncp.MagicNNCPEv3.B:
 310                                 err = nncp.MagicNNCPEv3.TooOld()
 311                         case nncp.MagicNNCPEv4.B:
 312                                 err = nncp.MagicNNCPEv4.TooOld()
 313                         case nncp.MagicNNCPEv5.B:
 314                                 err = nncp.MagicNNCPEv5.TooOld()
 315                         case nncp.MagicNNCPEv6.B:
 316                         default:
 317                                 err = errors.New("Bad packet magic number")
 318                         }
 319                         if err != nil {
 320                                 ctx.LogD(
 321                                         "bundle-rx",
 322                                         append(les, nncp.LE{K: "Err", V: err.Error()}),
 323                                         logMsg,
 324                                 )
 325                                 continue
 326                         }
 327                         if pktEnc.Nice > nice {
 328                                 ctx.LogD("bundle-rx-too-nice", les, func(les nncp.LEs) string {
 329                                         return logMsg(les) + ": too nice"
 330                                 })
 331                                 continue
 332                         }
 333                         if *pktEnc.Sender == *ctx.SelfId && *doDelete {
 334                                 if len(nodeIds) > 0 {
 335                                         if _, exists := nodeIds[*pktEnc.Recipient]; !exists {
 336                                                 ctx.LogD("bundle-tx-skip", les, func(les nncp.LEs) string {
 337                                                         return logMsg(les) + ": recipient is not requested"
 338                                                 })
 339                                                 continue
 340                                         }
 341                                 }
 342                                 nodeId32 := nncp.Base32Codec.EncodeToString(pktEnc.Recipient[:])
 343                                 les := nncp.LEs{
 344                                         {K: "XX", V: string(nncp.TTx)},
 345                                         {K: "Node", V: nodeId32},
 346                                         {K: "Pkt", V: pktName},
 347                                 }
 348                                 logMsg = func(les nncp.LEs) string {
 349                                         return fmt.Sprintf("Bundle transfer %s/tx/%s", nodeId32, pktName)
 350                                 }
 351                                 dstPath := filepath.Join(ctx.Spool, nodeId32, string(nncp.TTx), pktName)
 352                                 if _, err = os.Stat(dstPath); err != nil {
 353                                         ctx.LogD("bundle-tx-missing", les, func(les nncp.LEs) string {
 354                                                 return logMsg(les) + ": packet is already missing"
 355                                         })
 356                                         continue
 357                                 }
 358                                 hsh := nncp.MTHNew(entry.Size, 0)
 359                                 if _, err = hsh.Write(pktEncBuf); err != nil {
 360                                         log.Fatalln("Error during writing:", err)
 361                                 }
 362                                 if _, err = nncp.CopyProgressed(
 363                                         hsh, tarR, "Rx",
 364                                         append(les, nncp.LE{K: "FullSize", V: entry.Size}),
 365                                         ctx.ShowPrgrs,
 366                                 ); err != nil {
 367                                         log.Fatalln("Error during copying:", err)
 368                                 }
 369                                 if nncp.Base32Codec.EncodeToString(hsh.Sum(nil)) == pktName {
 370                                         ctx.LogI("bundle-tx-removed", les, func(les nncp.LEs) string {
 371                                                 return logMsg(les) + ": removed"
 372                                         })
 373                                         if !*dryRun {
 374                                                 os.Remove(dstPath)
 375                                                 if ctx.HdrUsage {
 376                                                         os.Remove(nncp.JobPath2Hdr(dstPath))
 377                                                 }
 378                                         }
 379                                 } else {
 380                                         ctx.LogE("bundle-tx", les, errors.New("bad checksum"), logMsg)
 381                                 }
 382                                 continue
 383                         }
 384                         if *pktEnc.Recipient != *ctx.SelfId {
 385                                 ctx.LogD("nncp-bundle", les, func(les nncp.LEs) string {
 386                                         return logMsg(les) + ": unknown recipient"
 387                                 })
 388                                 continue
 389                         }
 390                         if len(nodeIds) > 0 {
 391                                 if _, exists := nodeIds[*pktEnc.Sender]; !exists {
 392                                         ctx.LogD("bundle-rx-skip", les, func(les nncp.LEs) string {
 393                                                 return logMsg(les) + ": sender is not requested"
 394                                         })
 395                                         continue
 396                                 }
 397                         }
 398                         sender := nncp.Base32Codec.EncodeToString(pktEnc.Sender[:])
 399                         les = nncp.LEs{
 400                                 {K: "XX", V: string(nncp.TRx)},
 401                                 {K: "Node", V: sender},
 402                                 {K: "Pkt", V: pktName},
 403                                 {K: "FullSize", V: entry.Size},
 404                         }
 405                         logMsg = func(les nncp.LEs) string {
 406                                 return fmt.Sprintf("Bundle transfer %s/rx/%s", sender, pktName)
 407                         }
 408                         dstDirPath := filepath.Join(ctx.Spool, sender, string(nncp.TRx))
 409                         dstPath := filepath.Join(dstDirPath, pktName)
 410                         if _, err = os.Stat(dstPath); err == nil || !errors.Is(err, fs.ErrNotExist) {
 411                                 ctx.LogD("bundle-rx-exists", les, func(les nncp.LEs) string {
 412                                         return logMsg(les) + ": packet already exists"
 413                                 })
 414                                 continue
 415                         }
 416                         if _, err = os.Stat(filepath.Join(
 417                                 dstDirPath, nncp.SeenDir, pktName,
 418                         )); err == nil || !errors.Is(err, fs.ErrNotExist) {
 419                                 ctx.LogD("bundle-rx-seen", les, func(les nncp.LEs) string {
 420                                         return logMsg(les) + ": packet already seen"
 421                                 })
 422                                 continue
 423                         }
 424                         if *doCheck {
 425                                 if *dryRun {
 426                                         hsh := nncp.MTHNew(entry.Size, 0)
 427                                         if _, err = hsh.Write(pktEncBuf); err != nil {
 428                                                 log.Fatalln("Error during writing:", err)
 429                                         }
 430                                         if _, err = nncp.CopyProgressed(hsh, tarR, "check", les, ctx.ShowPrgrs); err != nil {
 431                                                 log.Fatalln("Error during copying:", err)
 432                                         }
 433                                         if nncp.Base32Codec.EncodeToString(hsh.Sum(nil)) != pktName {
 434                                                 ctx.LogE("bundle-rx", les, errors.New("bad checksum"), logMsg)
 435                                                 continue
 436                                         }
 437                                 } else {
 438                                         tmp, err := ctx.NewTmpFileWHash()
 439                                         if err != nil {
 440                                                 log.Fatalln("Error during temporary file creation:", err)
 441                                         }
 442                                         if _, err = tmp.W.Write(pktEncBuf); err != nil {
 443                                                 log.Fatalln("Error during writing:", err)
 444                                         }
 445                                         if _, err = nncp.CopyProgressed(tmp.W, tarR, "check", les, ctx.ShowPrgrs); err != nil {
 446                                                 log.Fatalln("Error during copying:", err)
 447                                         }
 448                                         if err = tmp.W.Flush(); err != nil {
 449                                                 log.Fatalln("Error during flusing:", err)
 450                                         }
 451                                         if nncp.Base32Codec.EncodeToString(tmp.Hsh.Sum(nil)) == pktName {
 452                                                 if err = tmp.Commit(dstDirPath); err != nil {
 453                                                         log.Fatalln("Error during commiting:", err)
 454                                                 }
 455                                         } else {
 456                                                 ctx.LogE("bundle-rx", les, errors.New("bad checksum"), logMsg)
 457                                                 tmp.Cancel()
 458                                                 continue
 459                                         }
 460                                 }
 461                         } else {
 462                                 if *dryRun {
 463                                         if _, err = nncp.CopyProgressed(io.Discard, tarR, "Rx", les, ctx.ShowPrgrs); err != nil {
 464                                                 log.Fatalln("Error during copying:", err)
 465                                         }
 466                                 } else {
 467                                         tmp, err := ctx.NewTmpFile()
 468                                         if err != nil {
 469                                                 log.Fatalln("Error during temporary file creation:", err)
 470                                         }
 471                                         bufTmp := bufio.NewWriterSize(tmp, nncp.MTHBlockSize)
 472                                         if _, err = bufTmp.Write(pktEncBuf); err != nil {
 473                                                 log.Fatalln("Error during writing:", err)
 474                                         }
 475                                         if _, err = nncp.CopyProgressed(bufTmp, tarR, "Rx", les, ctx.ShowPrgrs); err != nil {
 476                                                 log.Fatalln("Error during copying:", err)
 477                                         }
 478                                         if err = bufTmp.Flush(); err != nil {
 479                                                 log.Fatalln("Error during flushing:", err)
 480                                         }
 481                                         if !nncp.NoSync {
 482                                                 if err = tmp.Sync(); err != nil {
 483                                                         log.Fatalln("Error during syncing:", err)
 484                                                 }
 485                                         }
 486                                         if err = tmp.Close(); err != nil {
 487                                                 log.Fatalln("Error during closing:", err)
 488                                         }
 489                                         if err = os.MkdirAll(dstDirPath, os.FileMode(0777)); err != nil {
 490                                                 log.Fatalln("Error during mkdir:", err)
 491                                         }
 492                                         if err = os.Rename(tmp.Name(), dstPath); err != nil {
 493                                                 log.Fatalln("Error during renaming:", err)
 494                                         }
 495                                         if err = nncp.DirSync(dstDirPath); err != nil {
 496                                                 log.Fatalln("Error during syncing:", err)
 497                                         }
 498                                         if ctx.HdrUsage {
 499                                                 ctx.HdrWrite(pktEncBuf, dstPath)
 500                                         }
 501                                 }
 502                         }
 503                         for _, le := range les {
 504                                 if le.K == "FullSize" {
 505                                         les = append(les, nncp.LE{K: "Size", V: le.V})
 506                                         break
 507                                 }
 508                         }
 509                         ctx.LogI("bundle-rx", les, func(les nncp.LEs) string {
 510                                 return fmt.Sprintf(
 511                                         "Bundle transfer, received from %s %s (%s)",
 512                                         sender, pktName, humanize.IBytes(uint64(entry.Size)),
 513                                 )
 514                         })
 515                 }
 516         }
 517 }