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