src/cmd/nncp-bundle/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 // 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/ioutil"
  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/v6"
  38         "golang.org/x/crypto/blake2b"
  39 )
  40
  41 const (
  42         CopyBufSize = 1 << 17
  43 )
  44
  45 func usage() {
  46         fmt.Fprintf(os.Stderr, nncp.UsageHeader())
  47         fmt.Fprintf(os.Stderr, "nncp-bundle -- Create/digest stream of NNCP encrypted packets\n\n")
  48         fmt.Fprintf(os.Stderr, "Usage: %s [options] -tx [-delete] NODE [NODE ...] > ...\n", os.Args[0])
  49         fmt.Fprintf(os.Stderr, "       %s [options] -rx -delete [-dryrun] [NODE ...] < ...\n", os.Args[0])
  50         fmt.Fprintf(os.Stderr, "       %s [options] -rx [-check] [-dryrun] [NODE ...] < ...\n", os.Args[0])
  51         fmt.Fprintln(os.Stderr, "Options:")
  52         flag.PrintDefaults()
  53 }
  54
  55 func main() {
  56         var (
  57                 cfgPath   = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
  58                 niceRaw   = flag.String("nice", nncp.NicenessFmt(255), "Minimal required niceness")
  59                 doRx      = flag.Bool("rx", false, "Receive packets")
  60                 doTx      = flag.Bool("tx", false, "Transfer packets")
  61                 doDelete  = flag.Bool("delete", false, "Delete transferred packets")
  62                 doCheck   = flag.Bool("check", false, "Check integrity while receiving")
  63                 dryRun    = flag.Bool("dryrun", false, "Do no writes")
  64                 spoolPath = flag.String("spool", "", "Override path to spool")
  65                 logPath   = flag.String("log", "", "Override path to logfile")
  66                 quiet     = flag.Bool("quiet", false, "Print only errors")
  67                 showPrgrs = flag.Bool("progress", false, "Force progress showing")
  68                 omitPrgrs = flag.Bool("noprogress", false, "Omit progress showing")
  69                 debug     = flag.Bool("debug", false, "Print debug messages")
  70                 version   = flag.Bool("version", false, "Print version information")
  71                 warranty  = flag.Bool("warranty", false, "Print warranty information")
  72         )
  73         log.SetFlags(log.Lshortfile)
  74         flag.Usage = usage
  75         flag.Parse()
  76         if *warranty {
  77                 fmt.Println(nncp.Warranty)
  78                 return
  79         }
  80         if *version {
  81                 fmt.Println(nncp.VersionGet())
  82                 return
  83         }
  84         nice, err := nncp.NicenessParse(*niceRaw)
  85         if err != nil {
  86                 log.Fatalln(err)
  87         }
  88         if *doRx && *doTx {
  89                 log.Fatalln("-rx and -tx can not be set simultaneously")
  90         }
  91         if !*doRx && !*doTx {
  92                 log.Fatalln("At least one of -rx and -tx must be specified")
  93         }
  94
  95         ctx, err := nncp.CtxFromCmdline(
  96                 *cfgPath,
  97                 *spoolPath,
  98                 *logPath,
  99                 *quiet,
 100                 *showPrgrs,
 101                 *omitPrgrs,
 102                 *debug,
 103         )
 104         if err != nil {
 105                 log.Fatalln("Error during initialization:", err)
 106         }
 107
 108         nodeIds := make(map[nncp.NodeId]struct{}, flag.NArg())
 109         for i := 0; i < flag.NArg(); i++ {
 110                 node, err := ctx.FindNode(flag.Arg(i))
 111                 if err != nil {
 112                         log.Fatalln("Invalid specified:", err)
 113                 }
 114                 nodeIds[*node.Id] = struct{}{}
 115         }
 116
 117         ctx.Umask()
 118
 119         if *doTx {
 120                 var pktName string
 121                 bufStdout := bufio.NewWriter(os.Stdout)
 122                 tarWr := tar.NewWriter(bufStdout)
 123                 for nodeId := range nodeIds {
 124                         for job := range ctx.Jobs(&nodeId, nncp.TTx) {
 125                                 pktName = filepath.Base(job.Path)
 126                                 les := nncp.LEs{
 127                                         {K: "XX", V: string(nncp.TTx)},
 128                                         {K: "Node", V: nodeId.String()},
 129                                         {K: "Pkt", V: pktName},
 130                                 }
 131                                 if job.PktEnc.Nice > nice {
 132                                         ctx.LogD("bundle-tx-too-nice", les, func(les nncp.LEs) string {
 133                                                 return fmt.Sprintf(
 134                                                         "Bundle transfer %s/tx/%s: too nice %s",
 135                                                         ctx.NodeName(&nodeId),
 136                                                         pktName,
 137                                                         nncp.NicenessFmt(job.PktEnc.Nice),
 138                                                 )
 139                                         })
 140                                         continue
 141                                 }
 142                                 fd, err := os.Open(job.Path)
 143                                 if err != nil {
 144                                         log.Fatalln("Error during opening:", err)
 145                                 }
 146                                 if err = tarWr.WriteHeader(&tar.Header{
 147                                         Format:   tar.FormatUSTAR,
 148                                         Name:     nncp.NNCPBundlePrefix,
 149                                         Mode:     0700,
 150                                         Typeflag: tar.TypeDir,
 151                                 }); err != nil {
 152                                         log.Fatalln("Error writing tar header:", err)
 153                                 }
 154                                 if err = tarWr.WriteHeader(&tar.Header{
 155                                         Format: tar.FormatPAX,
 156                                         Name: strings.Join([]string{
 157                                                 nncp.NNCPBundlePrefix,
 158                                                 nodeId.String(),
 159                                                 ctx.SelfId.String(),
 160                                                 pktName,
 161                                         }, "/"),
 162                                         Mode:     0400,
 163                                         Size:     job.Size,
 164                                         Typeflag: tar.TypeReg,
 165                                 }); err != nil {
 166                                         log.Fatalln("Error writing tar header:", err)
 167                                 }
 168                                 if _, err = nncp.CopyProgressed(
 169                                         tarWr, bufio.NewReader(fd), "Tx",
 170                                         append(les, nncp.LEs{
 171                                                 {K: "Pkt", V: nncp.Base32Codec.EncodeToString(job.HshValue[:])},
 172                                                 {K: "FullSize", V: job.Size},
 173                                         }...),
 174                                         ctx.ShowPrgrs,
 175                                 ); err != nil {
 176                                         log.Fatalln("Error during copying to tar:", err)
 177                                 }
 178                                 if err = fd.Close(); err != nil {
 179                                         log.Fatalln("Error during closing:", err)
 180                                 }
 181                                 if err = tarWr.Flush(); err != nil {
 182                                         log.Fatalln("Error during tar flushing:", err)
 183                                 }
 184                                 if err = bufStdout.Flush(); err != nil {
 185                                         log.Fatalln("Error during stdout flushing:", err)
 186                                 }
 187                                 if *doDelete {
 188                                         if err = os.Remove(job.Path); err != nil {
 189                                                 log.Fatalln("Error during deletion:", err)
 190                                         } else if ctx.HdrUsage {
 191                                                 os.Remove(job.Path + nncp.HdrSuffix)
 192                                         }
 193                                 }
 194                                 ctx.LogI(
 195                                         "bundle-tx",
 196                                         append(les, nncp.LE{K: "Size", V: job.Size}),
 197                                         func(les nncp.LEs) string {
 198                                                 return fmt.Sprintf(
 199                                                         "Bundle transfer, sent to node %s %s (%s)",
 200                                                         ctx.NodeName(&nodeId),
 201                                                         pktName,
 202                                                         humanize.IBytes(uint64(job.Size)),
 203                                                 )
 204                                         },
 205                                 )
 206                         }
 207                 }
 208                 if err = tarWr.Close(); err != nil {
 209                         log.Fatalln("Error during tar closing:", err)
 210                 }
 211         } else {
 212                 bufStdin := bufio.NewReaderSize(os.Stdin, CopyBufSize*2)
 213                 pktEncBuf := make([]byte, nncp.PktEncOverhead)
 214                 var pktEnc *nncp.PktEnc
 215                 for {
 216                         peeked, err := bufStdin.Peek(CopyBufSize)
 217                         if err != nil && err != io.EOF {
 218                                 log.Fatalln("Error during reading:", err)
 219                         }
 220                         prefixIdx := bytes.Index(peeked, []byte(nncp.NNCPBundlePrefix))
 221                         if prefixIdx == -1 {
 222                                 if err == io.EOF {
 223                                         break
 224                                 }
 225                                 bufStdin.Discard(bufStdin.Buffered() - (len(nncp.NNCPBundlePrefix) - 1)) // #nosec G104
 226                                 continue
 227                         }
 228                         if _, err = bufStdin.Discard(prefixIdx); err != nil {
 229                                 panic(err)
 230                         }
 231                         tarR := tar.NewReader(bufStdin)
 232                         entry, err := tarR.Next()
 233                         if err != nil {
 234                                 if err != io.EOF {
 235                                         ctx.LogD(
 236                                                 "bundle-rx-read-tar",
 237                                                 nncp.LEs{{K: "XX", V: string(nncp.TRx)}, {K: "Err", V: err}},
 238                                                 func(les nncp.LEs) string {
 239                                                         return "Bundle transfer rx: reading tar"
 240                                                 },
 241                                         )
 242                                 }
 243                                 continue
 244                         }
 245                         if entry.Typeflag != tar.TypeDir {
 246                                 ctx.LogD(
 247                                         "bundle-rx-read-tar",
 248                                         nncp.LEs{
 249                                                 {K: "XX", V: string(nncp.TRx)},
 250                                                 {K: "Err", V: errors.New("expected NNCP/")},
 251                                         },
 252                                         func(les nncp.LEs) string {
 253                                                 return "Bundle transfer rx: reading tar"
 254                                         },
 255                                 )
 256                                 continue
 257                         }
 258                         entry, err = tarR.Next()
 259                         if err != nil {
 260                                 if err != io.EOF {
 261                                         ctx.LogD(
 262                                                 "bundle-rx-read-tar",
 263                                                 nncp.LEs{{K: "XX", V: string(nncp.TRx)}, {K: "Err", V: err}},
 264                                                 func(les nncp.LEs) string {
 265                                                         return "Bundle transfer rx: reading tar"
 266                                                 },
 267                                         )
 268                                 }
 269                                 continue
 270                         }
 271                         les := nncp.LEs{{K: "XX", V: string(nncp.TRx)}, {K: "Pkt", V: entry.Name}}
 272                         logMsg := func(les nncp.LEs) string {
 273                                 return "Bundle transfer rx/" + entry.Name
 274                         }
 275                         if entry.Size < nncp.PktEncOverhead {
 276                                 ctx.LogD("bundle-rx-too-small", les, func(les nncp.LEs) string {
 277                                         return logMsg(les) + ": too small packet"
 278                                 })
 279                                 continue
 280                         }
 281                         if !ctx.IsEnoughSpace(entry.Size) {
 282                                 ctx.LogE("bundle-rx", les, errors.New("not enough spool space"), logMsg)
 283                                 continue
 284                         }
 285                         pktName := filepath.Base(entry.Name)
 286                         if _, err = nncp.Base32Codec.DecodeString(pktName); err != nil {
 287                                 ctx.LogD(
 288                                         "bundle-rx",
 289                                         append(les, nncp.LE{K: "Err", V: "bad packet name"}),
 290                                         logMsg,
 291                                 )
 292                                 continue
 293                         }
 294                         if _, err = io.ReadFull(tarR, pktEncBuf); err != nil {
 295                                 ctx.LogD(
 296                                         "bundle-rx",
 297                                         append(les, nncp.LE{K: "Err", V: err}),
 298                                         logMsg,
 299                                 )
 300                                 continue
 301                         }
 302                         if _, err = xdr.Unmarshal(bytes.NewReader(pktEncBuf), &pktEnc); err != nil {
 303                                 ctx.LogD(
 304                                         "bundle-rx",
 305                                         append(les, nncp.LE{K: "Err", V: "Bad packet structure"}),
 306                                         logMsg,
 307                                 )
 308                                 continue
 309                         }
 310                         if pktEnc.Magic != nncp.MagicNNCPEv4 {
 311                                 ctx.LogD(
 312                                         "bundle-rx",
 313                                         append(les, nncp.LE{K: "Err", V: "Bad packet magic number"}),
 314                                         logMsg,
 315                                 )
 316                                 continue
 317                         }
 318                         if pktEnc.Nice > nice {
 319                                 ctx.LogD("bundle-rx-too-nice", les, func(les nncp.LEs) string {
 320                                         return logMsg(les) + ": too nice"
 321                                 })
 322                                 continue
 323                         }
 324                         if *pktEnc.Sender == *ctx.SelfId && *doDelete {
 325                                 if len(nodeIds) > 0 {
 326                                         if _, exists := nodeIds[*pktEnc.Recipient]; !exists {
 327                                                 ctx.LogD("bundle-tx-skip", les, func(les nncp.LEs) string {
 328                                                         return logMsg(les) + ": recipient is not requested"
 329                                                 })
 330                                                 continue
 331                                         }
 332                                 }
 333                                 nodeId32 := nncp.Base32Codec.EncodeToString(pktEnc.Recipient[:])
 334                                 les := nncp.LEs{
 335                                         {K: "XX", V: string(nncp.TTx)},
 336                                         {K: "Node", V: nodeId32},
 337                                         {K: "Pkt", V: pktName},
 338                                 }
 339                                 logMsg = func(les nncp.LEs) string {
 340                                         return fmt.Sprintf("Bundle transfer %s/tx/%s", nodeId32, pktName)
 341                                 }
 342                                 dstPath := filepath.Join(ctx.Spool, nodeId32, string(nncp.TTx), pktName)
 343                                 if _, err = os.Stat(dstPath); err != nil {
 344                                         ctx.LogD("bundle-tx-missing", les, func(les nncp.LEs) string {
 345                                                 return logMsg(les) + ": packet is already missing"
 346                                         })
 347                                         continue
 348                                 }
 349                                 hsh, err := blake2b.New256(nil)
 350                                 if err != nil {
 351                                         log.Fatalln("Error during hasher creation:", err)
 352                                 }
 353                                 if _, err = hsh.Write(pktEncBuf); err != nil {
 354                                         log.Fatalln("Error during writing:", err)
 355                                 }
 356                                 if _, err = nncp.CopyProgressed(
 357                                         hsh, tarR, "Rx",
 358                                         append(les, nncp.LE{K: "FullSize", V: entry.Size}),
 359                                         ctx.ShowPrgrs,
 360                                 ); err != nil {
 361                                         log.Fatalln("Error during copying:", err)
 362                                 }
 363                                 if nncp.Base32Codec.EncodeToString(hsh.Sum(nil)) == pktName {
 364                                         ctx.LogI("bundle-tx-removed", les, func(les nncp.LEs) string {
 365                                                 return logMsg(les) + ": removed"
 366                                         })
 367                                         if !*dryRun {
 368                                                 os.Remove(dstPath)
 369                                                 if ctx.HdrUsage {
 370                                                         os.Remove(dstPath + nncp.HdrSuffix)
 371                                                 }
 372                                         }
 373                                 } else {
 374                                         ctx.LogE("bundle-tx", les, errors.New("bad checksum"), logMsg)
 375                                 }
 376                                 continue
 377                         }
 378                         if *pktEnc.Recipient != *ctx.SelfId {
 379                                 ctx.LogD("nncp-bundle", les, func(les nncp.LEs) string {
 380                                         return logMsg(les) + ": unknown recipient"
 381                                 })
 382                                 continue
 383                         }
 384                         if len(nodeIds) > 0 {
 385                                 if _, exists := nodeIds[*pktEnc.Sender]; !exists {
 386                                         ctx.LogD("bundle-rx-skip", les, func(les nncp.LEs) string {
 387                                                 return logMsg(les) + ": sender is not requested"
 388                                         })
 389                                         continue
 390                                 }
 391                         }
 392                         sender := nncp.Base32Codec.EncodeToString(pktEnc.Sender[:])
 393                         les = nncp.LEs{
 394                                 {K: "XX", V: string(nncp.TRx)},
 395                                 {K: "Node", V: sender},
 396                                 {K: "Pkt", V: pktName},
 397                                 {K: "FullSize", V: entry.Size},
 398                         }
 399                         logMsg = func(les nncp.LEs) string {
 400                                 return fmt.Sprintf("Bundle transfer %s/rx/%s", sender, pktName)
 401                         }
 402                         dstDirPath := filepath.Join(ctx.Spool, sender, string(nncp.TRx))
 403                         dstPath := filepath.Join(dstDirPath, pktName)
 404                         if _, err = os.Stat(dstPath); err == nil || !os.IsNotExist(err) {
 405                                 ctx.LogD("bundle-rx-exists", les, func(les nncp.LEs) string {
 406                                         return logMsg(les) + ": packet already exists"
 407                                 })
 408                                 continue
 409                         }
 410                         if _, err = os.Stat(dstPath + nncp.SeenSuffix); err == nil || !os.IsNotExist(err) {
 411                                 ctx.LogD("bundle-rx-seen", les, func(les nncp.LEs) string {
 412                                         return logMsg(les) + ": packet already seen"
 413                                 })
 414                                 continue
 415                         }
 416                         if *doCheck {
 417                                 if *dryRun {
 418                                         hsh, err := blake2b.New256(nil)
 419                                         if err != nil {
 420                                                 log.Fatalln("Error during hasher creation:", err)
 421                                         }
 422                                         if _, err = hsh.Write(pktEncBuf); err != nil {
 423                                                 log.Fatalln("Error during writing:", err)
 424                                         }
 425                                         if _, err = nncp.CopyProgressed(hsh, tarR, "check", les, ctx.ShowPrgrs); err != nil {
 426                                                 log.Fatalln("Error during copying:", err)
 427                                         }
 428                                         if nncp.Base32Codec.EncodeToString(hsh.Sum(nil)) != pktName {
 429                                                 ctx.LogE("bundle-rx", les, errors.New("bad checksum"), logMsg)
 430                                                 continue
 431                                         }
 432                                 } else {
 433                                         tmp, err := ctx.NewTmpFileWHash()
 434                                         if err != nil {
 435                                                 log.Fatalln("Error during temporary file creation:", err)
 436                                         }
 437                                         if _, err = tmp.W.Write(pktEncBuf); err != nil {
 438                                                 log.Fatalln("Error during writing:", err)
 439                                         }
 440                                         if _, err = nncp.CopyProgressed(tmp.W, tarR, "check", les, ctx.ShowPrgrs); err != nil {
 441                                                 log.Fatalln("Error during copying:", err)
 442                                         }
 443                                         if err = tmp.W.Flush(); err != nil {
 444                                                 log.Fatalln("Error during flusing:", err)
 445                                         }
 446                                         if nncp.Base32Codec.EncodeToString(tmp.Hsh.Sum(nil)) == pktName {
 447                                                 if err = tmp.Commit(dstDirPath); err != nil {
 448                                                         log.Fatalln("Error during commiting:", err)
 449                                                 }
 450                                         } else {
 451                                                 ctx.LogE("bundle-rx", les, errors.New("bad checksum"), logMsg)
 452                                                 tmp.Cancel()
 453                                                 continue
 454                                         }
 455                                 }
 456                         } else {
 457                                 if *dryRun {
 458                                         if _, err = nncp.CopyProgressed(ioutil.Discard, tarR, "Rx", les, ctx.ShowPrgrs); err != nil {
 459                                                 log.Fatalln("Error during copying:", err)
 460                                         }
 461                                 } else {
 462                                         tmp, err := ctx.NewTmpFile()
 463                                         if err != nil {
 464                                                 log.Fatalln("Error during temporary file creation:", err)
 465                                         }
 466                                         bufTmp := bufio.NewWriterSize(tmp, CopyBufSize)
 467                                         if _, err = bufTmp.Write(pktEncBuf); err != nil {
 468                                                 log.Fatalln("Error during writing:", err)
 469                                         }
 470                                         if _, err = nncp.CopyProgressed(bufTmp, tarR, "Rx", les, ctx.ShowPrgrs); err != nil {
 471                                                 log.Fatalln("Error during copying:", err)
 472                                         }
 473                                         if err = bufTmp.Flush(); err != nil {
 474                                                 log.Fatalln("Error during flushing:", err)
 475                                         }
 476                                         if err = tmp.Sync(); err != nil {
 477                                                 log.Fatalln("Error during syncing:", err)
 478                                         }
 479                                         if err = tmp.Close(); err != nil {
 480                                                 log.Fatalln("Error during closing:", err)
 481                                         }
 482                                         if err = os.MkdirAll(dstDirPath, os.FileMode(0777)); err != nil {
 483                                                 log.Fatalln("Error during mkdir:", err)
 484                                         }
 485                                         if err = os.Rename(tmp.Name(), dstPath); err != nil {
 486                                                 log.Fatalln("Error during renaming:", err)
 487                                         }
 488                                         if err = nncp.DirSync(dstDirPath); err != nil {
 489                                                 log.Fatalln("Error during syncing:", err)
 490                                         }
 491                                         if ctx.HdrUsage {
 492                                                 ctx.HdrWrite(pktEncBuf, dstPath)
 493                                         }
 494                                 }
 495                         }
 496                         for _, le := range les {
 497                                 if le.K == "FullSize" {
 498                                         les = append(les, nncp.LE{K: "Size", V: le.V})
 499                                         break
 500                                 }
 501                         }
 502                         ctx.LogI("bundle-rx", les, func(les nncp.LEs) string {
 503                                 return fmt.Sprintf(
 504                                         "Bundle transfer, received from %s %s (%s)",
 505                                         sender, pktName, humanize.IBytes(uint64(entry.Size)),
 506                                 )
 507                         })
 508                 }
 509         }
 510 }