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 [NODE ...] < ...\n", os.Args[0])
  50         fmt.Fprintf(os.Stderr, "       %s [options] -rx [-check] [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                 quiet    = flag.Bool("quiet", false, "Print only errors")
  64                 debug    = flag.Bool("debug", false, "Print debug messages")
  65                 version  = flag.Bool("version", false, "Print version information")
  66                 warranty = flag.Bool("warranty", false, "Print warranty information")
  67         )
  68         flag.Usage = usage
  69         flag.Parse()
  70         if *warranty {
  71                 fmt.Println(nncp.Warranty)
  72                 return
  73         }
  74         if *version {
  75                 fmt.Println(nncp.VersionGet())
  76                 return
  77         }
  78         if *niceRaw < 1 || *niceRaw > 255 {
  79                 log.Fatalln("-nice must be between 1 and 255")
  80         }
  81         nice := uint8(*niceRaw)
  82         if *doRx && *doTx {
  83                 log.Fatalln("-rx and -tx can not be set simultaneously")
  84         }
  85         if !*doRx && !*doTx {
  86                 log.Fatalln("At least one of -rx and -tx must be specified")
  87         }
  88
  89         cfgRaw, err := ioutil.ReadFile(nncp.CfgPathFromEnv(cfgPath))
  90         if err != nil {
  91                 log.Fatalln("Can not read config:", err)
  92         }
  93         ctx, err := nncp.CfgParse(cfgRaw)
  94         if err != nil {
  95                 log.Fatalln("Can not parse config:", err)
  96         }
  97         ctx.Quiet = *quiet
  98         ctx.Debug = *debug
  99
 100         nodeIds := make(map[nncp.NodeId]struct{}, flag.NArg())
 101         for i := 0; i < flag.NArg(); i++ {
 102                 node, err := ctx.FindNode(flag.Arg(i))
 103                 if err != nil {
 104                         log.Fatalln("Invalid specified:", err)
 105                 }
 106                 nodeIds[*node.Id] = struct{}{}
 107         }
 108
 109         sds := nncp.SDS{}
 110         if *doTx {
 111                 sds["xx"] = string(nncp.TTx)
 112                 var pktName string
 113                 bufStdout := bufio.NewWriter(os.Stdout)
 114                 tarWr := tar.NewWriter(bufStdout)
 115                 for nodeId, _ := range nodeIds {
 116                         sds["node"] = nodeId.String()
 117                         for job := range ctx.Jobs(&nodeId, nncp.TTx) {
 118                                 pktName = filepath.Base(job.Fd.Name())
 119                                 sds["pkt"] = pktName
 120                                 if job.PktEnc.Nice > nice {
 121                                         ctx.LogD("nncp-bundle", sds, "too nice")
 122                                         job.Fd.Close()
 123                                         continue
 124                                 }
 125                                 if err = tarWr.WriteHeader(&tar.Header{
 126                                         Name: strings.Join([]string{
 127                                                 nodeId.String(),
 128                                                 ctx.SelfId.String(),
 129                                                 pktName,
 130                                         }, "/"),
 131                                         Mode:     0440,
 132                                         Size:     job.Size,
 133                                         Typeflag: tar.TypeReg,
 134                                 }); err != nil {
 135                                         log.Fatalln("Error writing tar header:", err)
 136                                 }
 137                                 if _, err = io.Copy(tarWr, job.Fd); err != nil {
 138                                         log.Fatalln("Error during copying to tar:", err)
 139                                 }
 140                                 job.Fd.Close()
 141                                 if err = tarWr.Flush(); err != nil {
 142                                         log.Fatalln("Error during tar flushing:", err)
 143                                 }
 144                                 if err = bufStdout.Flush(); err != nil {
 145                                         log.Fatalln("Error during stdout flushing:", err)
 146                                 }
 147                                 if *doDelete {
 148                                         if err = os.Remove(job.Fd.Name()); err != nil {
 149                                                 log.Fatalln("Error during deletion:", err)
 150                                         }
 151                                 }
 152                                 ctx.LogI("nncp-bundle", nncp.SdsAdd(sds, nncp.SDS{
 153                                         "size": strconv.FormatInt(job.Size, 10),
 154                                 }), "")
 155                         }
 156                 }
 157                 if err = tarWr.Close(); err != nil {
 158                         log.Fatalln("Error during tar closing:", err)
 159                 }
 160         } else {
 161                 tarR := tar.NewReader(bufio.NewReaderSize(os.Stdin, CopyBufSize))
 162                 var entry *tar.Header
 163                 var sepIndex int
 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                         sds["xx"] = string(nncp.TRx)
 172                         entry, err = tarR.Next()
 173                         if err != nil {
 174                                 if err == io.EOF {
 175                                         break
 176                                 }
 177                                 log.Fatalln("Error during tar reading:", err)
 178                         }
 179                         sds["pkt"] = entry.Name
 180                         if entry.Size < nncp.PktEncOverhead {
 181                                 ctx.LogD("nncp-bundle", sds, "Too small packet")
 182                                 continue
 183                         }
 184                         sepIndex = strings.LastIndex(entry.Name, "/")
 185                         if sepIndex == -1 {
 186                                 ctx.LogD("nncp-bundle", sds, "Bad packet name")
 187                                 continue
 188                         }
 189                         pktName = entry.Name[sepIndex+1:]
 190                         if _, err = nncp.FromBase32(pktName); err != nil {
 191                                 ctx.LogD("nncp-bundle", sds, "Bad packet name")
 192                                 continue
 193                         }
 194                         if _, err = io.ReadFull(tarR, pktEncBuf); err != nil {
 195                                 ctx.LogD("nncp-bundle", nncp.SdsAdd(sds, nncp.SDS{"err": err}), "read")
 196                                 continue
 197                         }
 198                         if _, err = xdr.Unmarshal(bytes.NewBuffer(pktEncBuf), &pktEnc); err != nil {
 199                                 ctx.LogD("nncp-bundle", sds, "Bad packet structure")
 200                                 continue
 201                         }
 202                         if pktEnc.Magic != nncp.MagicNNCPEv2 {
 203                                 ctx.LogD("nncp-bundle", sds, "Bad packet magic number")
 204                                 continue
 205                         }
 206                         if pktEnc.Nice > nice {
 207                                 ctx.LogD("nncp-bundle", sds, "too nice")
 208                                 continue
 209                         }
 210                         if *pktEnc.Sender == *ctx.SelfId && *doDelete {
 211                                 if len(nodeIds) > 0 {
 212                                         if _, exists = nodeIds[*pktEnc.Recipient]; !exists {
 213                                                 ctx.LogD("nncp-bundle", sds, "Recipient is not requested")
 214                                                 continue
 215                                         }
 216                                 }
 217                                 nodeId32 := nncp.ToBase32(pktEnc.Recipient[:])
 218                                 sds["xx"] = string(nncp.TTx)
 219                                 sds["node"] = nodeId32
 220                                 sds["pkt"] = pktName
 221                                 dstPath = filepath.Join(
 222                                         ctx.Spool,
 223                                         nodeId32,
 224                                         string(nncp.TTx),
 225                                         pktName,
 226                                 )
 227                                 if _, err = os.Stat(dstPath); err != nil {
 228                                         ctx.LogD("nncp-bundle", sds, "Packet is already missing")
 229                                         continue
 230                                 }
 231                                 hsh, err := blake2b.New256(nil)
 232                                 if err != nil {
 233                                         log.Fatalln("Error during hasher creation:", err)
 234                                 }
 235                                 if _, err = hsh.Write(pktEncBuf); err != nil {
 236                                         log.Fatalln("Error during writing:", err)
 237                                 }
 238                                 if _, err = io.Copy(hsh, tarR); err != nil {
 239                                         log.Fatalln("Error during copying:", err)
 240                                 }
 241                                 if nncp.ToBase32(hsh.Sum(nil)) == pktName {
 242                                         ctx.LogI("nncp-bundle", sds, "removed")
 243                                         os.Remove(dstPath)
 244                                 } else {
 245                                         ctx.LogE("nncp-bundle", sds, "bad checksum")
 246                                 }
 247                                 continue
 248                         }
 249                         if *pktEnc.Recipient != *ctx.SelfId {
 250                                 ctx.LogD("nncp-bundle", sds, "Unknown recipient")
 251                                 continue
 252                         }
 253                         if len(nodeIds) > 0 {
 254                                 if _, exists = nodeIds[*pktEnc.Sender]; !exists {
 255                                         ctx.LogD("nncp-bundle", sds, "Sender is not requested")
 256                                         continue
 257                                 }
 258                         }
 259                         sds["node"] = nncp.ToBase32(pktEnc.Recipient[:])
 260                         sds["pkt"] = pktName
 261                         selfPath = filepath.Join(ctx.Spool, ctx.SelfId.String(), string(nncp.TRx))
 262                         dstPath = filepath.Join(selfPath, pktName)
 263                         if _, err = os.Stat(dstPath); err == nil || !os.IsNotExist(err) {
 264                                 ctx.LogD("nncp-bundle", sds, "Packet already exists")
 265                                 continue
 266                         }
 267                         if *doCheck {
 268                                 tmp, err := ctx.NewTmpFileWHash()
 269                                 if err != nil {
 270                                         log.Fatalln("Error during temporary file creation:", err)
 271                                 }
 272                                 if _, err = tmp.W.Write(pktEncBuf); err != nil {
 273                                         log.Fatalln("Error during writing:", err)
 274                                 }
 275                                 if _, err = io.Copy(tmp.W, tarR); err != nil {
 276                                         log.Fatalln("Error during copying:", err)
 277                                 }
 278                                 if err = tmp.W.Flush(); err != nil {
 279                                         log.Fatalln("Error during flusing:", err)
 280                                 }
 281                                 if nncp.ToBase32(tmp.Hsh.Sum(nil)) == pktName {
 282                                         if err = tmp.Commit(selfPath); err != nil {
 283                                                 log.Fatalln("Error during commiting:", err)
 284                                         }
 285                                 } else {
 286                                         ctx.LogE("nncp-bundle", sds, "bad checksum")
 287                                         tmp.Cancel()
 288                                         continue
 289                                 }
 290                         } else {
 291                                 tmp, err := ctx.NewTmpFile()
 292                                 if err != nil {
 293                                         log.Fatalln("Error during temporary file creation:", err)
 294                                 }
 295                                 bufTmp := bufio.NewWriterSize(tmp, CopyBufSize)
 296                                 if _, err = bufTmp.Write(pktEncBuf); err != nil {
 297                                         log.Fatalln("Error during writing:", err)
 298                                 }
 299                                 if _, err = io.Copy(bufTmp, tarR); err != nil {
 300                                         log.Fatalln("Error during copying:", err)
 301                                 }
 302                                 if err = bufTmp.Flush(); err != nil {
 303                                         log.Fatalln("Error during flushing:", err)
 304                                 }
 305                                 tmp.Sync()
 306                                 tmp.Close()
 307                                 if err = os.MkdirAll(selfPath, os.FileMode(0700)); err != nil {
 308                                         log.Fatalln("Error during mkdir:", err)
 309                                 }
 310                                 if err = os.Rename(tmp.Name(), dstPath); err != nil {
 311                                         log.Fatalln("Error during renaming:", err)
 312                                 }
 313                         }
 314                         ctx.LogI("nncp-bundle", nncp.SdsAdd(sds, nncp.SDS{
 315                                 "size": strconv.FormatInt(entry.Size, 10),
 316                         }), "")
 317                 }
 318         }
 319 }