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) 2016-2018 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.Int("nice", 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         if *niceRaw < 1 || *niceRaw > 255 {
  82                 log.Fatalln("-nice must be between 1 and 255")
  83         }
  84         nice := uint8(*niceRaw)
  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.FormatPAX,
 124                                         Name: strings.Join([]string{
 125                                                 nncp.NNCPBundlePrefix,
 126                                                 nodeId.String(),
 127                                                 ctx.SelfId.String(),
 128                                                 pktName,
 129                                         }, "/"),
 130                                         Mode:     0400,
 131                                         Size:     job.Size,
 132                                         Typeflag: tar.TypeReg,
 133                                 }); err != nil {
 134                                         log.Fatalln("Error writing tar header:", err)
 135                                 }
 136                                 if _, err = io.Copy(tarWr, job.Fd); err != nil {
 137                                         log.Fatalln("Error during copying to tar:", err)
 138                                 }
 139                                 job.Fd.Close()
 140                                 if err = tarWr.Flush(); err != nil {
 141                                         log.Fatalln("Error during tar flushing:", err)
 142                                 }
 143                                 if err = bufStdout.Flush(); err != nil {
 144                                         log.Fatalln("Error during stdout flushing:", err)
 145                                 }
 146                                 if *doDelete {
 147                                         if err = os.Remove(job.Fd.Name()); err != nil {
 148                                                 log.Fatalln("Error during deletion:", err)
 149                                         }
 150                                 }
 151                                 ctx.LogI("nncp-bundle", nncp.SdsAdd(sds, nncp.SDS{
 152                                         "size": strconv.FormatInt(job.Size, 10),
 153                                 }), "")
 154                         }
 155                 }
 156                 if err = tarWr.Close(); err != nil {
 157                         log.Fatalln("Error during tar closing:", err)
 158                 }
 159         } else {
 160                 bufStdin := bufio.NewReaderSize(os.Stdin, CopyBufSize*2)
 161                 var peeked []byte
 162                 var prefixIdx int
 163                 var tarR *tar.Reader
 164                 var entry *tar.Header
 165                 var exists bool
 166                 pktEncBuf := make([]byte, nncp.PktEncOverhead)
 167                 var pktEnc *nncp.PktEnc
 168                 var pktName string
 169                 var selfPath string
 170                 var dstPath string
 171                 for {
 172                         peeked, err = bufStdin.Peek(CopyBufSize)
 173                         if err != nil && err != io.EOF {
 174                                 log.Fatalln("Error during reading:", err)
 175                         }
 176                         prefixIdx = bytes.Index(peeked, []byte(nncp.NNCPBundlePrefix))
 177                         if prefixIdx == -1 {
 178                                 if err == io.EOF {
 179                                         break
 180                                 }
 181                                 bufStdin.Discard(bufStdin.Buffered() - (len(nncp.NNCPBundlePrefix) - 1))
 182                                 continue
 183                         }
 184                         bufStdin.Discard(prefixIdx)
 185                         tarR = tar.NewReader(bufStdin)
 186                         sds["xx"] = string(nncp.TRx)
 187                         entry, err = tarR.Next()
 188                         if err != nil {
 189                                 if err != io.EOF {
 190                                         ctx.LogD(
 191                                                 "nncp-bundle",
 192                                                 nncp.SdsAdd(sds, nncp.SDS{"err": err}),
 193                                                 "error reading tar",
 194                                         )
 195                                 }
 196                                 continue
 197                         }
 198                         sds["pkt"] = entry.Name
 199                         if entry.Size < nncp.PktEncOverhead {
 200                                 ctx.LogD("nncp-bundle", sds, "Too small packet")
 201                                 continue
 202                         }
 203                         pktName = filepath.Base(entry.Name)
 204                         if _, err = nncp.FromBase32(pktName); err != nil {
 205                                 ctx.LogD("nncp-bundle", sds, "Bad packet name")
 206                                 continue
 207                         }
 208                         if _, err = io.ReadFull(tarR, pktEncBuf); err != nil {
 209                                 ctx.LogD("nncp-bundle", nncp.SdsAdd(sds, nncp.SDS{"err": err}), "read")
 210                                 continue
 211                         }
 212                         if _, err = xdr.Unmarshal(bytes.NewReader(pktEncBuf), &pktEnc); err != nil {
 213                                 ctx.LogD("nncp-bundle", sds, "Bad packet structure")
 214                                 continue
 215                         }
 216                         if pktEnc.Magic != nncp.MagicNNCPEv3 {
 217                                 ctx.LogD("nncp-bundle", sds, "Bad packet magic number")
 218                                 continue
 219                         }
 220                         if pktEnc.Nice > nice {
 221                                 ctx.LogD("nncp-bundle", sds, "too nice")
 222                                 continue
 223                         }
 224                         if *pktEnc.Sender == *ctx.SelfId && *doDelete {
 225                                 if len(nodeIds) > 0 {
 226                                         if _, exists = nodeIds[*pktEnc.Recipient]; !exists {
 227                                                 ctx.LogD("nncp-bundle", sds, "Recipient is not requested")
 228                                                 continue
 229                                         }
 230                                 }
 231                                 nodeId32 := nncp.ToBase32(pktEnc.Recipient[:])
 232                                 sds["xx"] = string(nncp.TTx)
 233                                 sds["node"] = nodeId32
 234                                 sds["pkt"] = pktName
 235                                 dstPath = filepath.Join(
 236                                         ctx.Spool,
 237                                         nodeId32,
 238                                         string(nncp.TTx),
 239                                         pktName,
 240                                 )
 241                                 if _, err = os.Stat(dstPath); err != nil {
 242                                         ctx.LogD("nncp-bundle", sds, "Packet is already missing")
 243                                         continue
 244                                 }
 245                                 hsh, err := blake2b.New256(nil)
 246                                 if err != nil {
 247                                         log.Fatalln("Error during hasher creation:", err)
 248                                 }
 249                                 if _, err = hsh.Write(pktEncBuf); err != nil {
 250                                         log.Fatalln("Error during writing:", err)
 251                                 }
 252                                 if _, err = io.Copy(hsh, tarR); err != nil {
 253                                         log.Fatalln("Error during copying:", err)
 254                                 }
 255                                 if nncp.ToBase32(hsh.Sum(nil)) == pktName {
 256                                         ctx.LogI("nncp-bundle", sds, "removed")
 257                                         if !*dryRun {
 258                                                 os.Remove(dstPath)
 259                                         }
 260                                 } else {
 261                                         ctx.LogE("nncp-bundle", sds, "bad checksum")
 262                                 }
 263                                 continue
 264                         }
 265                         if *pktEnc.Recipient != *ctx.SelfId {
 266                                 ctx.LogD("nncp-bundle", sds, "Unknown recipient")
 267                                 continue
 268                         }
 269                         if len(nodeIds) > 0 {
 270                                 if _, exists = nodeIds[*pktEnc.Sender]; !exists {
 271                                         ctx.LogD("nncp-bundle", sds, "Sender is not requested")
 272                                         continue
 273                                 }
 274                         }
 275                         sds["node"] = nncp.ToBase32(pktEnc.Recipient[:])
 276                         sds["pkt"] = pktName
 277                         selfPath = filepath.Join(ctx.Spool, ctx.SelfId.String(), string(nncp.TRx))
 278                         dstPath = filepath.Join(selfPath, pktName)
 279                         if _, err = os.Stat(dstPath); err == nil || !os.IsNotExist(err) {
 280                                 ctx.LogD("nncp-bundle", sds, "Packet already exists")
 281                                 continue
 282                         }
 283                         if _, err = os.Stat(dstPath + nncp.SeenSuffix); err == nil || !os.IsNotExist(err) {
 284                                 ctx.LogD("nncp-bundle", sds, "Packet already exists")
 285                                 continue
 286                         }
 287                         if *doCheck {
 288                                 if *dryRun {
 289                                         hsh, err := blake2b.New256(nil)
 290                                         if err != nil {
 291                                                 log.Fatalln("Error during hasher creation:", err)
 292                                         }
 293                                         if _, err = hsh.Write(pktEncBuf); err != nil {
 294                                                 log.Fatalln("Error during writing:", err)
 295                                         }
 296                                         if _, err = io.Copy(hsh, tarR); err != nil {
 297                                                 log.Fatalln("Error during copying:", err)
 298                                         }
 299                                         if nncp.ToBase32(hsh.Sum(nil)) != pktName {
 300                                                 ctx.LogE("nncp-bundle", sds, "bad checksum")
 301                                                 continue
 302                                         }
 303                                 } else {
 304                                         tmp, err := ctx.NewTmpFileWHash()
 305                                         if err != nil {
 306                                                 log.Fatalln("Error during temporary file creation:", err)
 307                                         }
 308                                         if _, err = tmp.W.Write(pktEncBuf); err != nil {
 309                                                 log.Fatalln("Error during writing:", err)
 310                                         }
 311                                         if _, err = io.Copy(tmp.W, tarR); err != nil {
 312                                                 log.Fatalln("Error during copying:", err)
 313                                         }
 314                                         if err = tmp.W.Flush(); err != nil {
 315                                                 log.Fatalln("Error during flusing:", err)
 316                                         }
 317                                         if nncp.ToBase32(tmp.Hsh.Sum(nil)) == pktName {
 318                                                 if err = tmp.Commit(selfPath); err != nil {
 319                                                         log.Fatalln("Error during commiting:", err)
 320                                                 }
 321                                         } else {
 322                                                 ctx.LogE("nncp-bundle", sds, "bad checksum")
 323                                                 tmp.Cancel()
 324                                                 continue
 325                                         }
 326                                 }
 327                         } else {
 328                                 if *dryRun {
 329                                         if _, err = io.Copy(ioutil.Discard, tarR); err != nil {
 330                                                 log.Fatalln("Error during copying:", err)
 331                                         }
 332                                 } else {
 333                                         tmp, err := ctx.NewTmpFile()
 334                                         if err != nil {
 335                                                 log.Fatalln("Error during temporary file creation:", err)
 336                                         }
 337                                         bufTmp := bufio.NewWriterSize(tmp, CopyBufSize)
 338                                         if _, err = bufTmp.Write(pktEncBuf); err != nil {
 339                                                 log.Fatalln("Error during writing:", err)
 340                                         }
 341                                         if _, err = io.Copy(bufTmp, tarR); err != nil {
 342                                                 log.Fatalln("Error during copying:", err)
 343                                         }
 344                                         if err = bufTmp.Flush(); err != nil {
 345                                                 log.Fatalln("Error during flushing:", err)
 346                                         }
 347                                         tmp.Sync()
 348                                         tmp.Close()
 349                                         if err = os.MkdirAll(selfPath, os.FileMode(0700)); err != nil {
 350                                                 log.Fatalln("Error during mkdir:", err)
 351                                         }
 352                                         if err = os.Rename(tmp.Name(), dstPath); err != nil {
 353                                                 log.Fatalln("Error during renaming:", err)
 354                                         }
 355                                 }
 356                         }
 357                         ctx.LogI("nncp-bundle", nncp.SdsAdd(sds, nncp.SDS{
 358                                 "size": strconv.FormatInt(entry.Size, 10),
 359                         }), "")
 360                 }
 361         }
 362 }