src/cmd/nncp-xfer/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, 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 // Exchange NNCP inbound and outbounds packets with external directory.
  19 package main
  20
  21 import (
  22         "bufio"
  23         "errors"
  24         "flag"
  25         "fmt"
  26         "io"
  27         "log"
  28         "os"
  29         "path/filepath"
  30
  31         xdr "github.com/davecgh/go-xdr/xdr2"
  32         "go.cypherpunks.ru/nncp/v5"
  33 )
  34
  35 func usage() {
  36         fmt.Fprintf(os.Stderr, nncp.UsageHeader())
  37         fmt.Fprintf(os.Stderr, "nncp-xfer -- copy inbound and outbounds packets\n\n")
  38         fmt.Fprintf(os.Stderr, "Usage: %s [options] DIR\nOptions:\n", os.Args[0])
  39         flag.PrintDefaults()
  40 }
  41
  42 func main() {
  43         var (
  44                 cfgPath   = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
  45                 nodeRaw   = flag.String("node", "", "Process only that node")
  46                 niceRaw   = flag.String("nice", nncp.NicenessFmt(255), "Minimal required niceness")
  47                 rxOnly    = flag.Bool("rx", false, "Only receive packets")
  48                 txOnly    = flag.Bool("tx", false, "Only transfer packets")
  49                 mkdir     = flag.Bool("mkdir", false, "Create necessary outbound directories")
  50                 keep      = flag.Bool("keep", false, "Do not delete transferred packets")
  51                 spoolPath = flag.String("spool", "", "Override path to spool")
  52                 logPath   = flag.String("log", "", "Override path to logfile")
  53                 quiet     = flag.Bool("quiet", false, "Print only errors")
  54                 showPrgrs = flag.Bool("progress", false, "Force progress showing")
  55                 omitPrgrs = flag.Bool("noprogress", false, "Omit progress showing")
  56                 debug     = flag.Bool("debug", false, "Print debug messages")
  57                 version   = flag.Bool("version", false, "Print version information")
  58                 warranty  = flag.Bool("warranty", false, "Print warranty information")
  59         )
  60         flag.Usage = usage
  61         flag.Parse()
  62         if *warranty {
  63                 fmt.Println(nncp.Warranty)
  64                 return
  65         }
  66         if *version {
  67                 fmt.Println(nncp.VersionGet())
  68                 return
  69         }
  70         if flag.NArg() != 1 {
  71                 usage()
  72                 os.Exit(1)
  73         }
  74         nice, err := nncp.NicenessParse(*niceRaw)
  75         if err != nil {
  76                 log.Fatalln(err)
  77         }
  78         if *rxOnly && *txOnly {
  79                 log.Fatalln("-rx and -tx can not be set simultaneously")
  80         }
  81
  82         ctx, err := nncp.CtxFromCmdline(
  83                 *cfgPath,
  84                 *spoolPath,
  85                 *logPath,
  86                 *quiet,
  87                 *showPrgrs,
  88                 *omitPrgrs,
  89                 *debug,
  90         )
  91         if err != nil {
  92                 log.Fatalln("Error during initialization:", err)
  93         }
  94
  95         var nodeOnly *nncp.Node
  96         if *nodeRaw != "" {
  97                 nodeOnly, err = ctx.FindNode(*nodeRaw)
  98                 if err != nil {
  99                         log.Fatalln("Invalid -node specified:", err)
 100                 }
 101         }
 102
 103         ctx.Umask()
 104         selfPath := filepath.Join(flag.Arg(0), ctx.SelfId.String())
 105         isBad := false
 106         var dir *os.File
 107         var fis []os.FileInfo
 108         sds := nncp.SDS{}
 109         if *txOnly {
 110                 goto Tx
 111         }
 112         sds["xx"] = string(nncp.TRx)
 113         sds["dir"] = selfPath
 114         ctx.LogD("nncp-xfer", sds, "self")
 115         if _, err = os.Stat(selfPath); err != nil {
 116                 if os.IsNotExist(err) {
 117                         ctx.LogD("nncp-xfer", sds, "no dir")
 118                         goto Tx
 119                 }
 120                 ctx.LogE("nncp-xfer", sds, err, "stat")
 121                 isBad = true
 122                 goto Tx
 123         }
 124         dir, err = os.Open(selfPath)
 125         if err != nil {
 126                 ctx.LogE("nncp-xfer", sds, err, "open")
 127                 isBad = true
 128                 goto Tx
 129         }
 130         fis, err = dir.Readdir(0)
 131         dir.Close()
 132         if err != nil {
 133                 ctx.LogE("nncp-xfer", sds, err, "read")
 134                 isBad = true
 135                 goto Tx
 136         }
 137         for _, fi := range fis {
 138                 if !fi.IsDir() {
 139                         continue
 140                 }
 141                 nodeId, err := nncp.NodeIdFromString(fi.Name())
 142                 sds["node"] = fi.Name()
 143                 if err != nil {
 144                         ctx.LogD("nncp-xfer", sds, "is not NodeId")
 145                         continue
 146                 }
 147                 if nodeOnly != nil && *nodeId != *nodeOnly.Id {
 148                         ctx.LogD("nncp-xfer", sds, "skip")
 149                         continue
 150                 }
 151                 if _, known := ctx.Neigh[*nodeId]; !known {
 152                         ctx.LogD("nncp-xfer", sds, "unknown")
 153                         continue
 154                 }
 155                 dir, err = os.Open(filepath.Join(selfPath, fi.Name()))
 156                 if err != nil {
 157                         ctx.LogE("nncp-xfer", sds, err, "open")
 158                         isBad = true
 159                         continue
 160                 }
 161                 fisInt, err := dir.Readdir(0)
 162                 dir.Close()
 163                 if err != nil {
 164                         ctx.LogE("nncp-xfer", sds, err, "read")
 165                         isBad = true
 166                         continue
 167                 }
 168                 for _, fiInt := range fisInt {
 169                         if !fi.IsDir() {
 170                                 continue
 171                         }
 172                         // Check that it is valid Base32 encoding
 173                         if _, err = nncp.NodeIdFromString(fiInt.Name()); err != nil {
 174                                 continue
 175                         }
 176                         filename := filepath.Join(dir.Name(), fiInt.Name())
 177                         sds["file"] = filename
 178                         delete(sds, "size")
 179                         fd, err := os.Open(filename)
 180                         if err != nil {
 181                                 ctx.LogE("nncp-xfer", sds, err, "open")
 182                                 isBad = true
 183                                 continue
 184                         }
 185                         var pktEnc nncp.PktEnc
 186                         _, err = xdr.Unmarshal(fd, &pktEnc)
 187                         if err != nil || pktEnc.Magic != nncp.MagicNNCPEv4 {
 188                                 ctx.LogD("nncp-xfer", sds, "is not a packet")
 189                                 fd.Close()
 190                                 continue
 191                         }
 192                         if pktEnc.Nice > nice {
 193                                 ctx.LogD("nncp-xfer", sds, "too nice")
 194                                 fd.Close()
 195                                 continue
 196                         }
 197                         sds["size"] = fiInt.Size()
 198                         if !ctx.IsEnoughSpace(fiInt.Size()) {
 199                                 ctx.LogE("nncp-xfer", sds, errors.New("is not enough space"), "")
 200                                 fd.Close()
 201                                 continue
 202                         }
 203                         fd.Seek(0, 0)
 204                         tmp, err := ctx.NewTmpFileWHash()
 205                         if err != nil {
 206                                 log.Fatalln(err)
 207                         }
 208                         r, w := io.Pipe()
 209                         go func() {
 210                                 _, err := io.CopyN(w, bufio.NewReader(fd), fiInt.Size())
 211                                 if err == nil {
 212                                         w.Close()
 213                                         return
 214                                 }
 215                                 ctx.LogE("nncp-xfer", sds, err, "copy")
 216                                 w.CloseWithError(err)
 217                         }()
 218                         if _, err = nncp.CopyProgressed(tmp.W, r, nncp.SdsAdd(sds, nncp.SDS{
 219                                 "pkt":      filename,
 220                                 "fullsize": sds["size"],
 221                         }), ctx.ShowPrgrs); err != nil {
 222                                 ctx.LogE("nncp-xfer", sds, err, "copy")
 223                                 isBad = true
 224                         }
 225                         fd.Close()
 226                         if isBad {
 227                                 tmp.Cancel()
 228                                 continue
 229                         }
 230                         if err = tmp.Commit(filepath.Join(
 231                                 ctx.Spool,
 232                                 nodeId.String(),
 233                                 string(nncp.TRx),
 234                         )); err != nil {
 235                                 log.Fatalln(err)
 236                         }
 237                         ctx.LogI("nncp-xfer", sds, "")
 238                         if !*keep {
 239                                 if err = os.Remove(filename); err != nil {
 240                                         ctx.LogE("nncp-xfer", sds, err, "remove")
 241                                         isBad = true
 242                                 }
 243                         }
 244                 }
 245         }
 246
 247 Tx:
 248         if *rxOnly {
 249                 if isBad {
 250                         os.Exit(1)
 251                 }
 252                 return
 253         }
 254         sds["xx"] = string(nncp.TTx)
 255         for nodeId, _ := range ctx.Neigh {
 256                 sds["node"] = nodeId
 257                 if nodeOnly != nil && nodeId != *nodeOnly.Id {
 258                         ctx.LogD("nncp-xfer", sds, "skip")
 259                         continue
 260                 }
 261                 dirLock, err := ctx.LockDir(&nodeId, nncp.TTx)
 262                 if err != nil {
 263                         continue
 264                 }
 265                 nodePath := filepath.Join(flag.Arg(0), nodeId.String())
 266                 sds["dir"] = nodePath
 267                 _, err = os.Stat(nodePath)
 268                 if err != nil {
 269                         if os.IsNotExist(err) {
 270                                 ctx.LogD("nncp-xfer", sds, "does not exist")
 271                                 if !*mkdir {
 272                                         ctx.UnlockDir(dirLock)
 273                                         continue
 274                                 }
 275                                 if err = os.Mkdir(nodePath, os.FileMode(0777)); err != nil {
 276                                         ctx.UnlockDir(dirLock)
 277                                         ctx.LogE("nncp-xfer", sds, err, "mkdir")
 278                                         isBad = true
 279                                         continue
 280                                 }
 281                         } else {
 282                                 ctx.UnlockDir(dirLock)
 283                                 ctx.LogE("nncp-xfer", sds, err, "stat")
 284                                 isBad = true
 285                                 continue
 286                         }
 287                 }
 288                 dstPath := filepath.Join(nodePath, ctx.SelfId.String())
 289                 sds["dir"] = dstPath
 290                 _, err = os.Stat(dstPath)
 291                 if err != nil {
 292                         if os.IsNotExist(err) {
 293                                 if err = os.Mkdir(dstPath, os.FileMode(0777)); err != nil {
 294                                         ctx.UnlockDir(dirLock)
 295                                         ctx.LogE("nncp-xfer", sds, err, "mkdir")
 296                                         isBad = true
 297                                         continue
 298                                 }
 299                         } else {
 300                                 ctx.UnlockDir(dirLock)
 301                                 ctx.LogE("nncp-xfer", sds, err, "stat")
 302                                 isBad = true
 303                                 continue
 304                         }
 305                 }
 306                 delete(sds, "dir")
 307                 for job := range ctx.Jobs(&nodeId, nncp.TTx) {
 308                         pktName := filepath.Base(job.Fd.Name())
 309                         sds["pkt"] = pktName
 310                         if job.PktEnc.Nice > nice {
 311                                 ctx.LogD("nncp-xfer", sds, "too nice")
 312                                 job.Fd.Close()
 313                                 continue
 314                         }
 315                         if _, err = os.Stat(filepath.Join(dstPath, pktName)); err == nil || !os.IsNotExist(err) {
 316                                 ctx.LogD("nncp-xfer", sds, "already exists")
 317                                 job.Fd.Close()
 318                                 continue
 319                         }
 320                         if _, err = os.Stat(filepath.Join(dstPath, pktName+nncp.SeenSuffix)); err == nil || !os.IsNotExist(err) {
 321                                 ctx.LogD("nncp-xfer", sds, "already exists")
 322                                 job.Fd.Close()
 323                                 continue
 324                         }
 325                         tmp, err := nncp.TempFile(dstPath, "xfer")
 326                         if err != nil {
 327                                 ctx.LogE("nncp-xfer", sds, err, "mktemp")
 328                                 job.Fd.Close()
 329                                 isBad = true
 330                                 break
 331                         }
 332                         sds["tmp"] = tmp.Name()
 333                         ctx.LogD("nncp-xfer", sds, "created")
 334                         bufW := bufio.NewWriter(tmp)
 335                         copied, err := nncp.CopyProgressed(
 336                                 bufW,
 337                                 bufio.NewReader(job.Fd),
 338                                 nncp.SdsAdd(sds, nncp.SDS{"fullsize": job.Size}),
 339                                 ctx.ShowPrgrs,
 340                         )
 341                         job.Fd.Close()
 342                         if err != nil {
 343                                 ctx.LogE("nncp-xfer", sds, err, "copy")
 344                                 tmp.Close()
 345                                 isBad = true
 346                                 continue
 347                         }
 348                         if err = bufW.Flush(); err != nil {
 349                                 tmp.Close()
 350                                 ctx.LogE("nncp-xfer", sds, err, "flush")
 351                                 isBad = true
 352                                 continue
 353                         }
 354                         if err = tmp.Sync(); err != nil {
 355                                 tmp.Close()
 356                                 ctx.LogE("nncp-xfer", sds, err, "sync")
 357                                 isBad = true
 358                                 continue
 359                         }
 360                         tmp.Close()
 361                         if err = os.Rename(tmp.Name(), filepath.Join(dstPath, pktName)); err != nil {
 362                                 ctx.LogE("nncp-xfer", sds, err, "rename")
 363                                 isBad = true
 364                                 continue
 365                         }
 366                         if err = nncp.DirSync(dstPath); err != nil {
 367                                 ctx.LogE("nncp-xfer", sds, err, "sync")
 368                                 isBad = true
 369                                 continue
 370                         }
 371                         os.Remove(filepath.Join(dstPath, pktName+".part"))
 372                         delete(sds, "tmp")
 373                         ctx.LogI("nncp-xfer", nncp.SdsAdd(sds, nncp.SDS{"size": copied}), "")
 374                         if !*keep {
 375                                 if err = os.Remove(job.Fd.Name()); err != nil {
 376                                         ctx.LogE("nncp-xfer", sds, err, "remove")
 377                                         isBad = true
 378                                 }
 379                         }
 380                 }
 381                 ctx.UnlockDir(dirLock)
 382         }
 383         if isBad {
 384                 os.Exit(1)
 385         }
 386 }