src/cypherpunks.ru/nncp/cmd/nncp-bundle/main.go

   1 /*
   2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
   3 Copyright (C) 2016-2019 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, either version 3 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 // Create/digest stream of NNCP encrypted packets.
  20 package main
  21
  22 import (
  23         "archive/tar"
  24         "bufio"
  25         "bytes"
  26         "flag"
  27         "fmt"
  28         "io"
  29         "io/ioutil"
  30         "log"
  31         "os"
  32         "path/filepath"
  33         "strconv"
  34         "strings"
  35
  36         "cypherpunks.ru/nncp"
  37         "github.com/davecgh/go-xdr/xdr2"
  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                 debug     = flag.Bool("debug", false, "Print debug messages")
  68                 version   = flag.Bool("version", false, "Print version information")
  69                 warranty  = flag.Bool("warranty", false, "Print warranty information")
  70         )
  71         flag.Usage = usage
  72         flag.Parse()
  73         if *warranty {
  74                 fmt.Println(nncp.Warranty)
  75                 return
  76         }
  77         if *version {
  78                 fmt.Println(nncp.VersionGet())
  79                 return
  80         }
  81         nice, err := nncp.NicenessParse(*niceRaw)
  82         if err != nil {
  83                 log.Fatalln(err)
  84         }
  85         if *doRx && *doTx {
  86                 log.Fatalln("-rx and -tx can not be set simultaneously")
  87         }
  88         if !*doRx && !*doTx {
  89                 log.Fatalln("At least one of -rx and -tx must be specified")
  90         }
  91
  92         ctx, err := nncp.CtxFromCmdline(*cfgPath, *spoolPath, *logPath, *quiet, *debug)
  93         if err != nil {
  94                 log.Fatalln("Error during initialization:", err)
  95         }
  96
  97         nodeIds := make(map[nncp.NodeId]struct{}, flag.NArg())
  98         for i := 0; i < flag.NArg(); i++ {
  99                 node, err := ctx.FindNode(flag.Arg(i))
 100                 if err != nil {
 101                         log.Fatalln("Invalid specified:", err)
 102                 }
 103                 nodeIds[*node.Id] = struct{}{}
 104         }
 105
 106         sds := nncp.SDS{}
 107         if *doTx {
 108                 sds["xx"] = string(nncp.TTx)
 109                 var pktName string
 110                 bufStdout := bufio.NewWriter(os.Stdout)
 111                 tarWr := tar.NewWriter(bufStdout)
 112                 for nodeId, _ := range nodeIds {
 113                         sds["node"] = nodeId.String()
 114                         for job := range ctx.Jobs(&nodeId, nncp.TTx) {
 115                                 pktName = filepath.Base(job.Fd.Name())
 116                                 sds["pkt"] = pktName
 117                                 if job.PktEnc.Nice > nice {
 118                                         ctx.LogD("nncp-bundle", sds, "too nice")
 119                                         job.Fd.Close()
 120                                         continue
 121                                 }
 122                                 if err = tarWr.WriteHeader(&tar.Header{
 123                                         Format:   tar.FormatUSTAR,
 124                                         Name:     nncp.NNCPBundlePrefix,
 125                                         Mode:     0700,
 126                                         Typeflag: tar.TypeDir,
 127                                 }); err != nil {
 128                                         log.Fatalln("Error writing tar header:", err)
 129                                 }
 130                                 if err = tarWr.WriteHeader(&tar.Header{
 131                                         Format: tar.FormatPAX,
 132                                         Name: strings.Join([]string{
 133                                                 nncp.NNCPBundlePrefix,
 134                                                 nodeId.String(),
 135                                                 ctx.SelfId.String(),
 136                                                 pktName,
 137                                         }, "/"),
 138                                         Mode:     0400,
 139                                         Size:     job.Size,
 140                                         Typeflag: tar.TypeReg,
 141                                 }); err != nil {
 142                                         log.Fatalln("Error writing tar header:", err)
 143                                 }
 144                                 if _, err = io.Copy(tarWr, job.Fd); err != nil {
 145                                         log.Fatalln("Error during copying to tar:", err)
 146                                 }
 147                                 job.Fd.Close()
 148                                 if err = tarWr.Flush(); err != nil {
 149                                         log.Fatalln("Error during tar flushing:", err)
 150                                 }
 151                                 if err = bufStdout.Flush(); err != nil {
 152                                         log.Fatalln("Error during stdout flushing:", err)
 153                                 }
 154                                 if *doDelete {
 155                                         if err = os.Remove(job.Fd.Name()); err != nil {
 156                                                 log.Fatalln("Error during deletion:", err)
 157                                         }
 158                                 }
 159                                 ctx.LogI("nncp-bundle", nncp.SdsAdd(sds, nncp.SDS{
 160                                         "size": strconv.FormatInt(job.Size, 10),
 161                                 }), "")
 162                         }
 163                 }
 164                 if err = tarWr.Close(); err != nil {
 165                         log.Fatalln("Error during tar closing:", err)
 166                 }
 167         } else {
 168                 bufStdin := bufio.NewReaderSize(os.Stdin, CopyBufSize*2)
 169                 var peeked []byte
 170                 var prefixIdx int
 171                 var tarR *tar.Reader
 172                 var entry *tar.Header
 173                 var exists bool
 174                 pktEncBuf := make([]byte, nncp.PktEncOverhead)
 175                 var pktEnc *nncp.PktEnc
 176                 var pktName string
 177                 var selfPath string
 178                 var dstPath string
 179                 for {
 180                         peeked, err = bufStdin.Peek(CopyBufSize)
 181                         if err != nil && err != io.EOF {
 182                                 log.Fatalln("Error during reading:", err)
 183                         }
 184                         prefixIdx = bytes.Index(peeked, []byte(nncp.NNCPBundlePrefix))
 185                         if prefixIdx == -1 {
 186                                 if err == io.EOF {
 187                                         break
 188                                 }
 189                                 bufStdin.Discard(bufStdin.Buffered() - (len(nncp.NNCPBundlePrefix) - 1))
 190                                 continue
 191                         }
 192                         bufStdin.Discard(prefixIdx)
 193                         tarR = tar.NewReader(bufStdin)
 194                         sds["xx"] = string(nncp.TRx)
 195                         entry, err = tarR.Next()
 196                         if err != nil {
 197                                 if err != io.EOF {
 198                                         ctx.LogD(
 199                                                 "nncp-bundle",
 200                                                 nncp.SdsAdd(sds, nncp.SDS{"err": err}),
 201                                                 "error reading tar",
 202                                         )
 203                                 }
 204                                 continue
 205                         }
 206                         if entry.Typeflag != tar.TypeDir {
 207                                 ctx.LogD("nncp-bundle", sds, "Expected NNCP/")
 208                                 continue
 209                         }
 210                         entry, err = tarR.Next()
 211                         if err != nil {
 212                                 if err != io.EOF {
 213                                         ctx.LogD(
 214                                                 "nncp-bundle",
 215                                                 nncp.SdsAdd(sds, nncp.SDS{"err": err}),
 216                                                 "error reading tar",
 217                                         )
 218                                 }
 219                                 continue
 220                         }
 221                         sds["pkt"] = entry.Name
 222                         if entry.Size < nncp.PktEncOverhead {
 223                                 ctx.LogD("nncp-bundle", sds, "Too small packet")
 224                                 continue
 225                         }
 226                         pktName = filepath.Base(entry.Name)
 227                         if _, err = nncp.FromBase32(pktName); err != nil {
 228                                 ctx.LogD("nncp-bundle", sds, "Bad packet name")
 229                                 continue
 230                         }
 231                         if _, err = io.ReadFull(tarR, pktEncBuf); err != nil {
 232                                 ctx.LogD("nncp-bundle", nncp.SdsAdd(sds, nncp.SDS{"err": err}), "read")
 233                                 continue
 234                         }
 235                         if _, err = xdr.Unmarshal(bytes.NewReader(pktEncBuf), &pktEnc); err != nil {
 236                                 ctx.LogD("nncp-bundle", sds, "Bad packet structure")
 237                                 continue
 238                         }
 239                         if pktEnc.Magic != nncp.MagicNNCPEv4 {
 240                                 ctx.LogD("nncp-bundle", sds, "Bad packet magic number")
 241                                 continue
 242                         }
 243                         if pktEnc.Nice > nice {
 244                                 ctx.LogD("nncp-bundle", sds, "too nice")
 245                                 continue
 246                         }
 247                         if *pktEnc.Sender == *ctx.SelfId && *doDelete {
 248                                 if len(nodeIds) > 0 {
 249                                         if _, exists = nodeIds[*pktEnc.Recipient]; !exists {
 250                                                 ctx.LogD("nncp-bundle", sds, "Recipient is not requested")
 251                                                 continue
 252                                         }
 253                                 }
 254                                 nodeId32 := nncp.ToBase32(pktEnc.Recipient[:])
 255                                 sds["xx"] = string(nncp.TTx)
 256                                 sds["node"] = nodeId32
 257                                 sds["pkt"] = pktName
 258                                 dstPath = filepath.Join(
 259                                         ctx.Spool,
 260                                         nodeId32,
 261                                         string(nncp.TTx),
 262                                         pktName,
 263                                 )
 264                                 if _, err = os.Stat(dstPath); err != nil {
 265                                         ctx.LogD("nncp-bundle", sds, "Packet is already missing")
 266                                         continue
 267                                 }
 268                                 hsh, err := blake2b.New256(nil)
 269                                 if err != nil {
 270                                         log.Fatalln("Error during hasher creation:", err)
 271                                 }
 272                                 if _, err = hsh.Write(pktEncBuf); err != nil {
 273                                         log.Fatalln("Error during writing:", err)
 274                                 }
 275                                 if _, err = io.Copy(hsh, tarR); err != nil {
 276                                         log.Fatalln("Error during copying:", err)
 277                                 }
 278                                 if nncp.ToBase32(hsh.Sum(nil)) == pktName {
 279                                         ctx.LogI("nncp-bundle", sds, "removed")
 280                                         if !*dryRun {
 281                                                 os.Remove(dstPath)
 282                                         }
 283                                 } else {
 284                                         ctx.LogE("nncp-bundle", sds, "bad checksum")
 285                                 }
 286                                 continue
 287                         }
 288                         if *pktEnc.Recipient != *ctx.SelfId {
 289                                 ctx.LogD("nncp-bundle", sds, "Unknown recipient")
 290                                 continue
 291                         }
 292                         if len(nodeIds) > 0 {
 293                                 if _, exists = nodeIds[*pktEnc.Sender]; !exists {
 294                                         ctx.LogD("nncp-bundle", sds, "Sender is not requested")
 295                                         continue
 296                                 }
 297                         }
 298                         sds["node"] = nncp.ToBase32(pktEnc.Recipient[:])
 299                         sds["pkt"] = pktName
 300                         selfPath = filepath.Join(ctx.Spool, ctx.SelfId.String(), string(nncp.TRx))
 301                         dstPath = filepath.Join(selfPath, pktName)
 302                         if _, err = os.Stat(dstPath); err == nil || !os.IsNotExist(err) {
 303                                 ctx.LogD("nncp-bundle", sds, "Packet already exists")
 304                                 continue
 305                         }
 306                         if _, err = os.Stat(dstPath + nncp.SeenSuffix); err == nil || !os.IsNotExist(err) {
 307                                 ctx.LogD("nncp-bundle", sds, "Packet already exists")
 308                                 continue
 309                         }
 310                         if *doCheck {
 311                                 if *dryRun {
 312                                         hsh, err := blake2b.New256(nil)
 313                                         if err != nil {
 314                                                 log.Fatalln("Error during hasher creation:", err)
 315                                         }
 316                                         if _, err = hsh.Write(pktEncBuf); err != nil {
 317                                                 log.Fatalln("Error during writing:", err)
 318                                         }
 319                                         if _, err = io.Copy(hsh, tarR); err != nil {
 320                                                 log.Fatalln("Error during copying:", err)
 321                                         }
 322                                         if nncp.ToBase32(hsh.Sum(nil)) != pktName {
 323                                                 ctx.LogE("nncp-bundle", sds, "bad checksum")
 324                                                 continue
 325                                         }
 326                                 } else {
 327                                         tmp, err := ctx.NewTmpFileWHash()
 328                                         if err != nil {
 329                                                 log.Fatalln("Error during temporary file creation:", err)
 330                                         }
 331                                         if _, err = tmp.W.Write(pktEncBuf); err != nil {
 332                                                 log.Fatalln("Error during writing:", err)
 333                                         }
 334                                         if _, err = io.Copy(tmp.W, tarR); err != nil {
 335                                                 log.Fatalln("Error during copying:", err)
 336                                         }
 337                                         if err = tmp.W.Flush(); err != nil {
 338                                                 log.Fatalln("Error during flusing:", err)
 339                                         }
 340                                         if nncp.ToBase32(tmp.Hsh.Sum(nil)) == pktName {
 341                                                 if err = tmp.Commit(selfPath); err != nil {
 342                                                         log.Fatalln("Error during commiting:", err)
 343                                                 }
 344                                         } else {
 345                                                 ctx.LogE("nncp-bundle", sds, "bad checksum")
 346                                                 tmp.Cancel()
 347                                                 continue
 348                                         }
 349                                 }
 350                         } else {
 351                                 if *dryRun {
 352                                         if _, err = io.Copy(ioutil.Discard, tarR); err != nil {
 353                                                 log.Fatalln("Error during copying:", err)
 354                                         }
 355                                 } else {
 356                                         tmp, err := ctx.NewTmpFile()
 357                                         if err != nil {
 358                                                 log.Fatalln("Error during temporary file creation:", err)
 359                                         }
 360                                         bufTmp := bufio.NewWriterSize(tmp, CopyBufSize)
 361                                         if _, err = bufTmp.Write(pktEncBuf); err != nil {
 362                                                 log.Fatalln("Error during writing:", err)
 363                                         }
 364                                         if _, err = io.Copy(bufTmp, tarR); err != nil {
 365                                                 log.Fatalln("Error during copying:", err)
 366                                         }
 367                                         if err = bufTmp.Flush(); err != nil {
 368                                                 log.Fatalln("Error during flushing:", err)
 369                                         }
 370                                         if err = tmp.Sync(); err != nil {
 371                                                 log.Fatalln("Error during syncing:", err)
 372                                         }
 373                                         tmp.Close()
 374                                         if err = os.MkdirAll(selfPath, os.FileMode(0700)); err != nil {
 375                                                 log.Fatalln("Error during mkdir:", err)
 376                                         }
 377                                         if err = os.Rename(tmp.Name(), dstPath); err != nil {
 378                                                 log.Fatalln("Error during renaming:", err)
 379                                         }
 380                                 }
 381                         }
 382                         ctx.LogI("nncp-bundle", nncp.SdsAdd(sds, nncp.SDS{
 383                                 "size": strconv.FormatInt(entry.Size, 10),
 384                         }), "")
 385                 }
 386         }
 387 }