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         "flag"
  24         "fmt"
  25         "io"
  26         "log"
  27         "os"
  28         "path/filepath"
  29         "strconv"
  30
  31         "github.com/davecgh/go-xdr/xdr2"
  32         "go.cypherpunks.ru/nncp/v4"
  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                 debug     = flag.Bool("debug", false, "Print debug messages")
  55                 version   = flag.Bool("version", false, "Print version information")
  56                 warranty  = flag.Bool("warranty", false, "Print warranty information")
  57         )
  58         flag.Usage = usage
  59         flag.Parse()
  60         if *warranty {
  61                 fmt.Println(nncp.Warranty)
  62                 return
  63         }
  64         if *version {
  65                 fmt.Println(nncp.VersionGet())
  66                 return
  67         }
  68         if flag.NArg() != 1 {
  69                 usage()
  70                 os.Exit(1)
  71         }
  72         nice, err := nncp.NicenessParse(*niceRaw)
  73         if err != nil {
  74                 log.Fatalln(err)
  75         }
  76         if *rxOnly && *txOnly {
  77                 log.Fatalln("-rx and -tx can not be set simultaneously")
  78         }
  79
  80         ctx, err := nncp.CtxFromCmdline(*cfgPath, *spoolPath, *logPath, *quiet, *debug)
  81         if err != nil {
  82                 log.Fatalln("Error during initialization:", err)
  83         }
  84
  85         var nodeOnly *nncp.Node
  86         if *nodeRaw != "" {
  87                 nodeOnly, err = ctx.FindNode(*nodeRaw)
  88                 if err != nil {
  89                         log.Fatalln("Invalid -node specified:", err)
  90                 }
  91         }
  92
  93         selfPath := filepath.Join(flag.Arg(0), ctx.SelfId.String())
  94         isBad := false
  95         var dir *os.File
  96         var fis []os.FileInfo
  97         sds := nncp.SDS{}
  98         if *txOnly {
  99                 goto Tx
 100         }
 101         sds["xx"] = string(nncp.TRx)
 102         sds["dir"] = selfPath
 103         ctx.LogD("nncp-xfer", sds, "self")
 104         if _, err = os.Stat(selfPath); err != nil {
 105                 if os.IsNotExist(err) {
 106                         ctx.LogD("nncp-xfer", sds, "no dir")
 107                         goto Tx
 108                 }
 109                 ctx.LogE("nncp-xfer", nncp.SdsAdd(sds, nncp.SDS{"err": err}), "stat")
 110                 isBad = true
 111                 goto Tx
 112         }
 113         dir, err = os.Open(selfPath)
 114         if err != nil {
 115                 ctx.LogE("nncp-xfer", nncp.SdsAdd(sds, nncp.SDS{"err": err}), "open")
 116                 isBad = true
 117                 goto Tx
 118         }
 119         fis, err = dir.Readdir(0)
 120         dir.Close()
 121         if err != nil {
 122                 ctx.LogE("nncp-xfer", nncp.SdsAdd(sds, nncp.SDS{"err": err}), "read")
 123                 isBad = true
 124                 goto Tx
 125         }
 126         for _, fi := range fis {
 127                 if !fi.IsDir() {
 128                         continue
 129                 }
 130                 nodeId, err := nncp.NodeIdFromString(fi.Name())
 131                 sds["node"] = fi.Name()
 132                 if err != nil {
 133                         ctx.LogD("nncp-xfer", sds, "is not NodeId")
 134                         continue
 135                 }
 136                 if nodeOnly != nil && *nodeId != *nodeOnly.Id {
 137                         ctx.LogD("nncp-xfer", sds, "skip")
 138                         continue
 139                 }
 140                 if _, known := ctx.Neigh[*nodeId]; !known {
 141                         ctx.LogD("nncp-xfer", sds, "unknown")
 142                         continue
 143                 }
 144                 dir, err = os.Open(filepath.Join(selfPath, fi.Name()))
 145                 if err != nil {
 146                         ctx.LogE("nncp-xfer", nncp.SdsAdd(sds, nncp.SDS{"err": err}), "open")
 147                         isBad = true
 148                         continue
 149                 }
 150                 fisInt, err := dir.Readdir(0)
 151                 dir.Close()
 152                 if err != nil {
 153                         ctx.LogE("nncp-xfer", nncp.SdsAdd(sds, nncp.SDS{"err": err}), "read")
 154                         isBad = true
 155                         continue
 156                 }
 157                 for _, fiInt := range fisInt {
 158                         if !fi.IsDir() {
 159                                 continue
 160                         }
 161                         filename := filepath.Join(dir.Name(), fiInt.Name())
 162                         sds["file"] = filename
 163                         delete(sds, "size")
 164                         fd, err := os.Open(filename)
 165                         if err != nil {
 166                                 ctx.LogE("nncp-xfer", nncp.SdsAdd(sds, nncp.SDS{"err": err}), "open")
 167                                 isBad = true
 168                                 continue
 169                         }
 170                         var pktEnc nncp.PktEnc
 171                         _, err = xdr.Unmarshal(fd, &pktEnc)
 172                         if err != nil || pktEnc.Magic != nncp.MagicNNCPEv4 {
 173                                 ctx.LogD("nncp-xfer", sds, "is not a packet")
 174                                 fd.Close()
 175                                 continue
 176                         }
 177                         if pktEnc.Nice > nice {
 178                                 ctx.LogD("nncp-xfer", sds, "too nice")
 179                                 fd.Close()
 180                                 continue
 181                         }
 182                         sds["size"] = strconv.FormatInt(fiInt.Size(), 10)
 183                         if !ctx.IsEnoughSpace(fiInt.Size()) {
 184                                 ctx.LogE("nncp-xfer", sds, "is not enough space")
 185                                 fd.Close()
 186                                 continue
 187                         }
 188                         fd.Seek(0, 0)
 189                         tmp, err := ctx.NewTmpFileWHash()
 190                         if err != nil {
 191                                 log.Fatalln(err)
 192                         }
 193                         if _, err = io.CopyN(tmp.W, bufio.NewReader(fd), fiInt.Size()); err != nil {
 194                                 ctx.LogE("nncp-xfer", nncp.SdsAdd(sds, nncp.SDS{"err": err}), "copy")
 195                                 isBad = true
 196                                 fd.Close()
 197                                 tmp.Cancel()
 198                                 continue
 199                         }
 200                         fd.Close()
 201                         if err = tmp.Commit(filepath.Join(
 202                                 ctx.Spool,
 203                                 nodeId.String(),
 204                                 string(nncp.TRx),
 205                         )); err != nil {
 206                                 log.Fatalln(err)
 207                         }
 208                         ctx.LogI("nncp-xfer", sds, "")
 209                         if !*keep {
 210                                 if err = os.Remove(filename); err != nil {
 211                                         ctx.LogE("nncp-xfer", nncp.SdsAdd(sds, nncp.SDS{"err": err}), "remove")
 212                                         isBad = true
 213                                 }
 214                         }
 215                 }
 216         }
 217
 218 Tx:
 219         if *rxOnly {
 220                 if isBad {
 221                         os.Exit(1)
 222                 }
 223                 return
 224         }
 225         sds["xx"] = string(nncp.TTx)
 226         for nodeId, _ := range ctx.Neigh {
 227                 sds["node"] = nodeId
 228                 if nodeOnly != nil && nodeId != *nodeOnly.Id {
 229                         ctx.LogD("nncp-xfer", sds, "skip")
 230                         continue
 231                 }
 232                 dirLock, err := ctx.LockDir(&nodeId, nncp.TTx)
 233                 if err != nil {
 234                         continue
 235                 }
 236                 nodePath := filepath.Join(flag.Arg(0), nodeId.String())
 237                 sds["dir"] = nodePath
 238                 _, err = os.Stat(nodePath)
 239                 if err != nil {
 240                         if os.IsNotExist(err) {
 241                                 ctx.LogD("nncp-xfer", sds, "does not exist")
 242                                 if !*mkdir {
 243                                         ctx.UnlockDir(dirLock)
 244                                         continue
 245                                 }
 246                                 if err = os.Mkdir(nodePath, os.FileMode(0777)); err != nil {
 247                                         ctx.UnlockDir(dirLock)
 248                                         ctx.LogE("nncp-xfer", nncp.SdsAdd(sds, nncp.SDS{"err": err}), "mkdir")
 249                                         isBad = true
 250                                         continue
 251                                 }
 252                         } else {
 253                                 ctx.UnlockDir(dirLock)
 254                                 ctx.LogE("nncp-xfer", nncp.SdsAdd(sds, nncp.SDS{"err": err}), "stat")
 255                                 isBad = true
 256                                 continue
 257                         }
 258                 }
 259                 dstPath := filepath.Join(nodePath, ctx.SelfId.String())
 260                 sds["dir"] = dstPath
 261                 _, err = os.Stat(dstPath)
 262                 if err != nil {
 263                         if os.IsNotExist(err) {
 264                                 if err = os.Mkdir(dstPath, os.FileMode(0777)); err != nil {
 265                                         ctx.UnlockDir(dirLock)
 266                                         ctx.LogE("nncp-xfer", nncp.SdsAdd(sds, nncp.SDS{"err": err}), "mkdir")
 267                                         isBad = true
 268                                         continue
 269                                 }
 270                         } else {
 271                                 ctx.UnlockDir(dirLock)
 272                                 ctx.LogE("nncp-xfer", nncp.SdsAdd(sds, nncp.SDS{"err": err}), "stat")
 273                                 isBad = true
 274                                 continue
 275                         }
 276                 }
 277                 delete(sds, "dir")
 278                 for job := range ctx.Jobs(&nodeId, nncp.TTx) {
 279                         pktName := filepath.Base(job.Fd.Name())
 280                         sds["pkt"] = pktName
 281                         if job.PktEnc.Nice > nice {
 282                                 ctx.LogD("nncp-xfer", sds, "too nice")
 283                                 job.Fd.Close()
 284                                 continue
 285                         }
 286                         if _, err = os.Stat(filepath.Join(dstPath, pktName)); err == nil || !os.IsNotExist(err) {
 287                                 ctx.LogD("nncp-xfer", sds, "already exists")
 288                                 job.Fd.Close()
 289                                 continue
 290                         }
 291                         if _, err = os.Stat(filepath.Join(dstPath, pktName+nncp.SeenSuffix)); err == nil || !os.IsNotExist(err) {
 292                                 ctx.LogD("nncp-xfer", sds, "already exists")
 293                                 job.Fd.Close()
 294                                 continue
 295                         }
 296                         tmp, err := nncp.TempFile(dstPath, "xfer")
 297                         if err != nil {
 298                                 ctx.LogE("nncp-xfer", nncp.SdsAdd(sds, nncp.SDS{"err": err}), "mktemp")
 299                                 job.Fd.Close()
 300                                 isBad = true
 301                                 break
 302                         }
 303                         sds["tmp"] = tmp.Name()
 304                         ctx.LogD("nncp-xfer", sds, "created")
 305                         bufW := bufio.NewWriter(tmp)
 306                         copied, err := io.Copy(bufW, bufio.NewReader(job.Fd))
 307                         job.Fd.Close()
 308                         if err != nil {
 309                                 ctx.LogE("nncp-xfer", nncp.SdsAdd(sds, nncp.SDS{"err": err}), "copy")
 310                                 tmp.Close()
 311                                 isBad = true
 312                                 continue
 313                         }
 314                         if err = bufW.Flush(); err != nil {
 315                                 tmp.Close()
 316                                 ctx.LogE("nncp-xfer", nncp.SdsAdd(sds, nncp.SDS{"err": err}), "flush")
 317                                 isBad = true
 318                                 continue
 319                         }
 320                         if err = tmp.Sync(); err != nil {
 321                                 tmp.Close()
 322                                 ctx.LogE("nncp-xfer", nncp.SdsAdd(sds, nncp.SDS{"err": err}), "sync")
 323                                 isBad = true
 324                                 continue
 325                         }
 326                         tmp.Close()
 327                         if err = os.Rename(tmp.Name(), filepath.Join(dstPath, pktName)); err != nil {
 328                                 ctx.LogE("nncp-xfer", nncp.SdsAdd(sds, nncp.SDS{"err": err}), "rename")
 329                                 isBad = true
 330                                 continue
 331                         }
 332                         os.Remove(filepath.Join(dstPath, pktName+".part"))
 333                         delete(sds, "tmp")
 334                         ctx.LogI("nncp-xfer", nncp.SdsAdd(sds, nncp.SDS{
 335                                 "size": strconv.FormatInt(copied, 10),
 336                         }), "")
 337                         if !*keep {
 338                                 if err = os.Remove(job.Fd.Name()); err != nil {
 339                                         ctx.LogE("nncp-xfer", nncp.SdsAdd(sds, nncp.SDS{"err": err}), "remove")
 340                                         isBad = true
 341                                 }
 342                         }
 343                 }
 344                 ctx.UnlockDir(dirLock)
 345         }
 346         if isBad {
 347                 os.Exit(1)
 348         }
 349 }