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) 2016-2017 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.Fprintln(os.Stderr, "nncp-bundle -- Create/digest stream of NNCP encrypted packets\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 not writings")
  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                                         Name: strings.Join([]string{
 124                                                 nncp.NNCPBundlePrefix,
 125                                                 nodeId.String(),
 126                                                 ctx.SelfId.String(),
 127                                                 pktName,
 128                                         }, "/"),
 129                                         Mode:     0440,
 130                                         Size:     job.Size,
 131                                         Typeflag: tar.TypeReg,
 132                                 }); err != nil {
 133                                         log.Fatalln("Error writing tar header:", err)
 134                                 }
 135                                 if _, err = io.Copy(tarWr, job.Fd); err != nil {
 136                                         log.Fatalln("Error during copying to tar:", err)
 137                                 }
 138                                 job.Fd.Close()
 139                                 if err = tarWr.Flush(); err != nil {
 140                                         log.Fatalln("Error during tar flushing:", err)
 141                                 }
 142                                 if err = bufStdout.Flush(); err != nil {
 143                                         log.Fatalln("Error during stdout flushing:", err)
 144                                 }
 145                                 if *doDelete {
 146                                         if err = os.Remove(job.Fd.Name()); err != nil {
 147                                                 log.Fatalln("Error during deletion:", err)
 148                                         }
 149                                 }
 150                                 ctx.LogI("nncp-bundle", nncp.SdsAdd(sds, nncp.SDS{
 151                                         "size": strconv.FormatInt(job.Size, 10),
 152                                 }), "")
 153                         }
 154                 }
 155                 if err = tarWr.Close(); err != nil {
 156                         log.Fatalln("Error during tar closing:", err)
 157                 }
 158         } else {
 159                 bufStdin := bufio.NewReaderSize(os.Stdin, CopyBufSize*2)
 160                 var peeked []byte
 161                 var prefixIdx int
 162                 var tarR *tar.Reader
 163                 var entry *tar.Header
 164                 var exists bool
 165                 pktEncBuf := make([]byte, nncp.PktEncOverhead)
 166                 var pktEnc *nncp.PktEnc
 167                 var pktName string
 168                 var selfPath string
 169                 var dstPath string
 170                 for {
 171                         peeked, err = bufStdin.Peek(CopyBufSize)
 172                         if err != nil && err != io.EOF {
 173                                 log.Fatalln("Error during reading:", err)
 174                         }
 175                         prefixIdx = bytes.Index(peeked, []byte(nncp.NNCPBundlePrefix))
 176                         if prefixIdx == -1 {
 177                                 if err == io.EOF {
 178                                         break
 179                                 }
 180                                 bufStdin.Discard(bufStdin.Buffered() - (len(nncp.NNCPBundlePrefix) - 1))
 181                                 continue
 182                         }
 183                         bufStdin.Discard(prefixIdx)
 184                         tarR = tar.NewReader(bufStdin)
 185                         sds["xx"] = string(nncp.TRx)
 186                         entry, err = tarR.Next()
 187                         if err != nil {
 188                                 if err != io.EOF {
 189                                         ctx.LogD(
 190                                                 "nncp-bundle",
 191                                                 nncp.SdsAdd(sds, nncp.SDS{"err": err}),
 192                                                 "error reading tar",
 193                                         )
 194                                 }
 195                                 continue
 196                         }
 197                         sds["pkt"] = entry.Name
 198                         if entry.Size < nncp.PktEncOverhead {
 199                                 ctx.LogD("nncp-bundle", sds, "Too small packet")
 200                                 continue
 201                         }
 202                         pktName = filepath.Base(entry.Name)
 203                         if _, err = nncp.FromBase32(pktName); err != nil {
 204                                 ctx.LogD("nncp-bundle", sds, "Bad packet name")
 205                                 continue
 206                         }
 207                         if _, err = io.ReadFull(tarR, pktEncBuf); err != nil {
 208                                 ctx.LogD("nncp-bundle", nncp.SdsAdd(sds, nncp.SDS{"err": err}), "read")
 209                                 continue
 210                         }
 211                         if _, err = xdr.Unmarshal(bytes.NewReader(pktEncBuf), &pktEnc); err != nil {
 212                                 ctx.LogD("nncp-bundle", sds, "Bad packet structure")
 213                                 continue
 214                         }
 215                         if pktEnc.Magic != nncp.MagicNNCPEv2 {
 216                                 ctx.LogD("nncp-bundle", sds, "Bad packet magic number")
 217                                 continue
 218                         }
 219                         if pktEnc.Nice > nice {
 220                                 ctx.LogD("nncp-bundle", sds, "too nice")
 221                                 continue
 222                         }
 223                         if *pktEnc.Sender == *ctx.SelfId && *doDelete {
 224                                 if len(nodeIds) > 0 {
 225                                         if _, exists = nodeIds[*pktEnc.Recipient]; !exists {
 226                                                 ctx.LogD("nncp-bundle", sds, "Recipient is not requested")
 227                                                 continue
 228                                         }
 229                                 }
 230                                 nodeId32 := nncp.ToBase32(pktEnc.Recipient[:])
 231                                 sds["xx"] = string(nncp.TTx)
 232                                 sds["node"] = nodeId32
 233                                 sds["pkt"] = pktName
 234                                 dstPath = filepath.Join(
 235                                         ctx.Spool,
 236                                         nodeId32,
 237                                         string(nncp.TTx),
 238                                         pktName,
 239                                 )
 240                                 if _, err = os.Stat(dstPath); err != nil {
 241                                         ctx.LogD("nncp-bundle", sds, "Packet is already missing")
 242                                         continue
 243                                 }
 244                                 hsh, err := blake2b.New256(nil)
 245                                 if err != nil {
 246                                         log.Fatalln("Error during hasher creation:", err)
 247                                 }
 248                                 if _, err = hsh.Write(pktEncBuf); err != nil {
 249                                         log.Fatalln("Error during writing:", err)
 250                                 }
 251                                 if _, err = io.Copy(hsh, tarR); err != nil {
 252                                         log.Fatalln("Error during copying:", err)
 253                                 }
 254                                 if nncp.ToBase32(hsh.Sum(nil)) == pktName {
 255                                         ctx.LogI("nncp-bundle", sds, "removed")
 256                                         if !*dryRun {
 257                                                 os.Remove(dstPath)
 258                                         }
 259                                 } else {
 260                                         ctx.LogE("nncp-bundle", sds, "bad checksum")
 261                                 }
 262                                 continue
 263                         }
 264                         if *pktEnc.Recipient != *ctx.SelfId {
 265                                 ctx.LogD("nncp-bundle", sds, "Unknown recipient")
 266                                 continue
 267                         }
 268                         if len(nodeIds) > 0 {
 269                                 if _, exists = nodeIds[*pktEnc.Sender]; !exists {
 270                                         ctx.LogD("nncp-bundle", sds, "Sender is not requested")
 271                                         continue
 272                                 }
 273                         }
 274                         sds["node"] = nncp.ToBase32(pktEnc.Recipient[:])
 275                         sds["pkt"] = pktName
 276                         selfPath = filepath.Join(ctx.Spool, ctx.SelfId.String(), string(nncp.TRx))
 277                         dstPath = filepath.Join(selfPath, pktName)
 278                         if _, err = os.Stat(dstPath); err == nil || !os.IsNotExist(err) {
 279                                 ctx.LogD("nncp-bundle", sds, "Packet already exists")
 280                                 continue
 281                         }
 282                         if _, err = os.Stat(dstPath + nncp.SeenSuffix); err == nil || !os.IsNotExist(err) {
 283                                 ctx.LogD("nncp-bundle", sds, "Packet already exists")
 284                                 continue
 285                         }
 286                         if *doCheck {
 287                                 if *dryRun {
 288                                         hsh, err := blake2b.New256(nil)
 289                                         if err != nil {
 290                                                 log.Fatalln("Error during hasher creation:", err)
 291                                         }
 292                                         if _, err = hsh.Write(pktEncBuf); err != nil {
 293                                                 log.Fatalln("Error during writing:", err)
 294                                         }
 295                                         if _, err = io.Copy(hsh, tarR); err != nil {
 296                                                 log.Fatalln("Error during copying:", err)
 297                                         }
 298                                         if nncp.ToBase32(hsh.Sum(nil)) != pktName {
 299                                                 ctx.LogE("nncp-bundle", sds, "bad checksum")
 300                                                 continue
 301                                         }
 302                                 } else {
 303                                         tmp, err := ctx.NewTmpFileWHash()
 304                                         if err != nil {
 305                                                 log.Fatalln("Error during temporary file creation:", err)
 306                                         }
 307                                         if _, err = tmp.W.Write(pktEncBuf); err != nil {
 308                                                 log.Fatalln("Error during writing:", err)
 309                                         }
 310                                         if _, err = io.Copy(tmp.W, tarR); err != nil {
 311                                                 log.Fatalln("Error during copying:", err)
 312                                         }
 313                                         if err = tmp.W.Flush(); err != nil {
 314                                                 log.Fatalln("Error during flusing:", err)
 315                                         }
 316                                         if nncp.ToBase32(tmp.Hsh.Sum(nil)) == pktName {
 317                                                 if err = tmp.Commit(selfPath); err != nil {
 318                                                         log.Fatalln("Error during commiting:", err)
 319                                                 }
 320                                         } else {
 321                                                 ctx.LogE("nncp-bundle", sds, "bad checksum")
 322                                                 tmp.Cancel()
 323                                                 continue
 324                                         }
 325                                 }
 326                         } else {
 327                                 if *dryRun {
 328                                         if _, err = io.Copy(ioutil.Discard, tarR); err != nil {
 329                                                 log.Fatalln("Error during copying:", err)
 330                                         }
 331                                 } else {
 332                                         tmp, err := ctx.NewTmpFile()
 333                                         if err != nil {
 334                                                 log.Fatalln("Error during temporary file creation:", err)
 335                                         }
 336                                         bufTmp := bufio.NewWriterSize(tmp, CopyBufSize)
 337                                         if _, err = bufTmp.Write(pktEncBuf); err != nil {
 338                                                 log.Fatalln("Error during writing:", err)
 339                                         }
 340                                         if _, err = io.Copy(bufTmp, tarR); err != nil {
 341                                                 log.Fatalln("Error during copying:", err)
 342                                         }
 343                                         if err = bufTmp.Flush(); err != nil {
 344                                                 log.Fatalln("Error during flushing:", err)
 345                                         }
 346                                         tmp.Sync()
 347                                         tmp.Close()
 348                                         if err = os.MkdirAll(selfPath, os.FileMode(0700)); err != nil {
 349                                                 log.Fatalln("Error during mkdir:", err)
 350                                         }
 351                                         if err = os.Rename(tmp.Name(), dstPath); err != nil {
 352                                                 log.Fatalln("Error during renaming:", err)
 353                                         }
 354                                 }
 355                         }
 356                         ctx.LogI("nncp-bundle", nncp.SdsAdd(sds, nncp.SDS{
 357                                 "size": strconv.FormatInt(entry.Size, 10),
 358                         }), "")
 359                 }
 360         }
 361 }