src/toss.go

   1 /*
   2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
   3 Copyright (C) 2016-2020 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 package nncp
  19
  20 import (
  21         "bufio"
  22         "bytes"
  23         "encoding/base64"
  24         "errors"
  25         "fmt"
  26         "io"
  27         "io/ioutil"
  28         "log"
  29         "mime"
  30         "os"
  31         "os/exec"
  32         "path"
  33         "path/filepath"
  34         "strconv"
  35         "strings"
  36
  37         xdr "github.com/davecgh/go-xdr/xdr2"
  38         "github.com/dustin/go-humanize"
  39         "github.com/klauspost/compress/zstd"
  40         "golang.org/x/crypto/blake2b"
  41         "golang.org/x/crypto/poly1305"
  42 )
  43
  44 const (
  45         SeenSuffix = ".seen"
  46 )
  47
  48 func newNotification(fromTo *FromToJSON, subject string, body []byte) io.Reader {
  49         lines := []string{
  50                 "From: " + fromTo.From,
  51                 "To: " + fromTo.To,
  52                 "Subject: " + mime.BEncoding.Encode("UTF-8", subject),
  53         }
  54         if len(body) > 0 {
  55                 lines = append(lines, []string{
  56                         "MIME-Version: 1.0",
  57                         "Content-Type: text/plain; charset=utf-8",
  58                         "Content-Transfer-Encoding: base64",
  59                         "",
  60                         base64.StdEncoding.EncodeToString(body),
  61                 }...)
  62         }
  63         return strings.NewReader(strings.Join(lines, "\n"))
  64 }
  65
  66 func (ctx *Ctx) Toss(
  67         nodeId *NodeId,
  68         nice uint8,
  69         dryRun, doSeen, noFile, noFreq, noExec, noTrns bool,
  70 ) bool {
  71         dirLock, err := ctx.LockDir(nodeId, "toss")
  72         if err != nil {
  73                 ctx.LogE("rx", SDS{}, err, "lock")
  74                 return false
  75         }
  76         defer ctx.UnlockDir(dirLock)
  77         isBad := false
  78         sendmail := ctx.Neigh[*ctx.SelfId].Exec["sendmail"]
  79         decompressor, err := zstd.NewReader(nil)
  80         if err != nil {
  81                 panic(err)
  82         }
  83         defer decompressor.Close()
  84         for job := range ctx.Jobs(nodeId, TRx) {
  85                 pktName := filepath.Base(job.Fd.Name())
  86                 sds := SDS{"node": job.PktEnc.Sender, "pkt": pktName}
  87                 if job.PktEnc.Nice > nice {
  88                         ctx.LogD("rx", SdsAdd(sds, SDS{"nice": int(job.PktEnc.Nice)}), "too nice")
  89                         continue
  90                 }
  91                 pipeR, pipeW := io.Pipe()
  92                 go func(job Job) error {
  93                         pipeWB := bufio.NewWriter(pipeW)
  94                         _, _, err := PktEncRead(
  95                                 ctx.Self,
  96                                 ctx.Neigh,
  97                                 bufio.NewReader(job.Fd),
  98                                 pipeWB,
  99                         )
 100                         job.Fd.Close() // #nosec G104
 101                         if err != nil {
 102                                 ctx.LogE("rx", sds, err, "decryption")
 103                                 return pipeW.CloseWithError(err)
 104                         }
 105                         if err = pipeWB.Flush(); err != nil {
 106                                 ctx.LogE("rx", sds, err, "decryption flush")
 107                                 return pipeW.CloseWithError(err)
 108                         }
 109                         return pipeW.Close()
 110                 }(job)
 111                 var pkt Pkt
 112                 var err error
 113                 var pktSize int64
 114                 var pktSizeBlocks int64
 115                 if _, err = xdr.Unmarshal(pipeR, &pkt); err != nil {
 116                         ctx.LogE("rx", sds, err, "unmarshal")
 117                         isBad = true
 118                         goto Closing
 119                 }
 120                 pktSize = job.Size - PktEncOverhead - PktOverhead - PktSizeOverhead
 121                 pktSizeBlocks = pktSize / (EncBlkSize + poly1305.TagSize)
 122                 if pktSize%(EncBlkSize+poly1305.TagSize) != 0 {
 123                         pktSize -= poly1305.TagSize
 124                 }
 125                 pktSize -= pktSizeBlocks * poly1305.TagSize
 126                 sds["size"] = pktSize
 127                 ctx.LogD("rx", sds, "taken")
 128                 switch pkt.Type {
 129                 case PktTypeExec:
 130                         if noExec {
 131                                 goto Closing
 132                         }
 133                         path := bytes.Split(pkt.Path[:int(pkt.PathLen)], []byte{0})
 134                         handle := string(path[0])
 135                         args := make([]string, 0, len(path)-1)
 136                         for _, p := range path[1:] {
 137                                 args = append(args, string(p))
 138                         }
 139                         argsStr := strings.Join(append([]string{handle}, args...), " ")
 140                         sds := SdsAdd(sds, SDS{
 141                                 "type": "exec",
 142                                 "dst":  argsStr,
 143                         })
 144                         sender := ctx.Neigh[*job.PktEnc.Sender]
 145                         cmdline, exists := sender.Exec[handle]
 146                         if !exists || len(cmdline) == 0 {
 147                                 ctx.LogE("rx", sds, errors.New("No handle found"), "")
 148                                 isBad = true
 149                                 goto Closing
 150                         }
 151                         if err = decompressor.Reset(pipeR); err != nil {
 152                                 log.Fatalln(err)
 153                         }
 154                         if !dryRun {
 155                                 cmd := exec.Command(
 156                                         cmdline[0],
 157                                         append(cmdline[1:len(cmdline)], args...)...,
 158                                 )
 159                                 cmd.Env = append(
 160                                         cmd.Env,
 161                                         "NNCP_SELF="+ctx.Self.Id.String(),
 162                                         "NNCP_SENDER="+sender.Id.String(),
 163                                         "NNCP_NICE="+strconv.Itoa(int(pkt.Nice)),
 164                                 )
 165                                 cmd.Stdin = decompressor
 166                                 output, err := cmd.Output()
 167                                 if err != nil {
 168                                         ctx.LogE("rx", sds, err, "handle")
 169                                         isBad = true
 170                                         goto Closing
 171                                 }
 172                                 if len(sendmail) > 0 && ctx.NotifyExec != nil {
 173                                         notify, exists := ctx.NotifyExec[sender.Name+"."+handle]
 174                                         if !exists {
 175                                                 notify, exists = ctx.NotifyExec["*."+handle]
 176                                         }
 177                                         if exists {
 178                                                 cmd := exec.Command(
 179                                                         sendmail[0],
 180                                                         append(sendmail[1:len(sendmail)], notify.To)...,
 181                                                 )
 182                                                 cmd.Stdin = newNotification(notify, fmt.Sprintf(
 183                                                         "Exec from %s: %s", sender.Name, argsStr,
 184                                                 ), output)
 185                                                 if err = cmd.Run(); err != nil {
 186                                                         ctx.LogE("rx", sds, err, "notify")
 187                                                 }
 188                                         }
 189                                 }
 190                         }
 191                         ctx.LogI("rx", sds, "")
 192                         if !dryRun {
 193                                 if doSeen {
 194                                         if fd, err := os.Create(job.Fd.Name() + SeenSuffix); err == nil {
 195                                                 fd.Close() // #nosec G104
 196                                         }
 197                                 }
 198                                 if err = os.Remove(job.Fd.Name()); err != nil {
 199                                         ctx.LogE("rx", sds, err, "remove")
 200                                         isBad = true
 201                                 }
 202                         }
 203                 case PktTypeFile:
 204                         if noFile {
 205                                 goto Closing
 206                         }
 207                         dst := string(pkt.Path[:int(pkt.PathLen)])
 208                         sds := SdsAdd(sds, SDS{"type": "file", "dst": dst})
 209                         if filepath.IsAbs(dst) {
 210                                 ctx.LogE("rx", sds, errors.New("non-relative destination path"), "")
 211                                 isBad = true
 212                                 goto Closing
 213                         }
 214                         incoming := ctx.Neigh[*job.PktEnc.Sender].Incoming
 215                         if incoming == nil {
 216                                 ctx.LogE("rx", sds, errors.New("incoming is not allowed"), "")
 217                                 isBad = true
 218                                 goto Closing
 219                         }
 220                         dir := filepath.Join(*incoming, path.Dir(dst))
 221                         if err = os.MkdirAll(dir, os.FileMode(0777)); err != nil {
 222                                 ctx.LogE("rx", sds, err, "mkdir")
 223                                 isBad = true
 224                                 goto Closing
 225                         }
 226                         if !dryRun {
 227                                 tmp, err := TempFile(dir, "file")
 228                                 if err != nil {
 229                                         ctx.LogE("rx", sds, err, "mktemp")
 230                                         isBad = true
 231                                         goto Closing
 232                                 }
 233                                 sds["tmp"] = tmp.Name()
 234                                 ctx.LogD("rx", sds, "created")
 235                                 bufW := bufio.NewWriter(tmp)
 236                                 if _, err = CopyProgressed(
 237                                         bufW, pipeR, "Rx file",
 238                                         SdsAdd(sds, SDS{"fullsize": sds["size"]}),
 239                                         ctx.ShowPrgrs,
 240                                 ); err != nil {
 241                                         ctx.LogE("rx", sds, err, "copy")
 242                                         isBad = true
 243                                         goto Closing
 244                                 }
 245                                 if err = bufW.Flush(); err != nil {
 246                                         tmp.Close() // #nosec G104
 247                                         ctx.LogE("rx", sds, err, "copy")
 248                                         isBad = true
 249                                         goto Closing
 250                                 }
 251                                 if err = tmp.Sync(); err != nil {
 252                                         tmp.Close() // #nosec G104
 253                                         ctx.LogE("rx", sds, err, "copy")
 254                                         isBad = true
 255                                         goto Closing
 256                                 }
 257                                 if err = tmp.Close(); err != nil {
 258                                         ctx.LogE("rx", sds, err, "copy")
 259                                         isBad = true
 260                                         goto Closing
 261                                 }
 262                                 dstPathOrig := filepath.Join(*incoming, dst)
 263                                 dstPath := dstPathOrig
 264                                 dstPathCtr := 0
 265                                 for {
 266                                         if _, err = os.Stat(dstPath); err != nil {
 267                                                 if os.IsNotExist(err) {
 268                                                         break
 269                                                 }
 270                                                 ctx.LogE("rx", sds, err, "stat")
 271                                                 isBad = true
 272                                                 goto Closing
 273                                         }
 274                                         dstPath = dstPathOrig + "." + strconv.Itoa(dstPathCtr)
 275                                         dstPathCtr++
 276                                 }
 277                                 if err = os.Rename(tmp.Name(), dstPath); err != nil {
 278                                         ctx.LogE("rx", sds, err, "rename")
 279                                         isBad = true
 280                                 }
 281                                 if err = DirSync(*incoming); err != nil {
 282                                         ctx.LogE("rx", sds, err, "sync")
 283                                         isBad = true
 284                                 }
 285                                 delete(sds, "tmp")
 286                         }
 287                         ctx.LogI("rx", sds, "")
 288                         if !dryRun {
 289                                 if doSeen {
 290                                         if fd, err := os.Create(job.Fd.Name() + SeenSuffix); err == nil {
 291                                                 fd.Close() // #nosec G104
 292                                         }
 293                                 }
 294                                 if err = os.Remove(job.Fd.Name()); err != nil {
 295                                         ctx.LogE("rx", sds, err, "remove")
 296                                         isBad = true
 297                                 }
 298                                 if len(sendmail) > 0 && ctx.NotifyFile != nil {
 299                                         cmd := exec.Command(
 300                                                 sendmail[0],
 301                                                 append(sendmail[1:len(sendmail)], ctx.NotifyFile.To)...,
 302                                         )
 303                                         cmd.Stdin = newNotification(ctx.NotifyFile, fmt.Sprintf(
 304                                                 "File from %s: %s (%s)",
 305                                                 ctx.Neigh[*job.PktEnc.Sender].Name,
 306                                                 dst,
 307                                                 humanize.IBytes(uint64(pktSize)),
 308                                         ), nil)
 309                                         if err = cmd.Run(); err != nil {
 310                                                 ctx.LogE("rx", sds, err, "notify")
 311                                         }
 312                                 }
 313                         }
 314                 case PktTypeFreq:
 315                         if noFreq {
 316                                 goto Closing
 317                         }
 318                         src := string(pkt.Path[:int(pkt.PathLen)])
 319                         if filepath.IsAbs(src) {
 320                                 ctx.LogE("rx", sds, errors.New("non-relative source path"), "")
 321                                 isBad = true
 322                                 goto Closing
 323                         }
 324                         sds := SdsAdd(sds, SDS{"type": "freq", "src": src})
 325                         dstRaw, err := ioutil.ReadAll(pipeR)
 326                         if err != nil {
 327                                 ctx.LogE("rx", sds, err, "read")
 328                                 isBad = true
 329                                 goto Closing
 330                         }
 331                         dst := string(dstRaw)
 332                         sds["dst"] = dst
 333                         sender := ctx.Neigh[*job.PktEnc.Sender]
 334                         freqPath := sender.FreqPath
 335                         if freqPath == nil {
 336                                 ctx.LogE("rx", sds, errors.New("freqing is not allowed"), "")
 337                                 isBad = true
 338                                 goto Closing
 339                         }
 340                         if !dryRun {
 341                                 err = ctx.TxFile(
 342                                         sender,
 343                                         pkt.Nice,
 344                                         filepath.Join(*freqPath, src),
 345                                         dst,
 346                                         sender.FreqChunked,
 347                                         sender.FreqMinSize,
 348                                         sender.FreqMaxSize,
 349                                 )
 350                                 if err != nil {
 351                                         ctx.LogE("rx", sds, err, "tx file")
 352                                         isBad = true
 353                                         goto Closing
 354                                 }
 355                         }
 356                         ctx.LogI("rx", sds, "")
 357                         if !dryRun {
 358                                 if doSeen {
 359                                         if fd, err := os.Create(job.Fd.Name() + SeenSuffix); err == nil {
 360                                                 fd.Close() // #nosec G104
 361                                         }
 362                                 }
 363                                 if err = os.Remove(job.Fd.Name()); err != nil {
 364                                         ctx.LogE("rx", sds, err, "remove")
 365                                         isBad = true
 366                                 }
 367                                 if len(sendmail) > 0 && ctx.NotifyFreq != nil {
 368                                         cmd := exec.Command(
 369                                                 sendmail[0],
 370                                                 append(sendmail[1:len(sendmail)], ctx.NotifyFreq.To)...,
 371                                         )
 372                                         cmd.Stdin = newNotification(ctx.NotifyFreq, fmt.Sprintf(
 373                                                 "Freq from %s: %s", sender.Name, src,
 374                                         ), nil)
 375                                         if err = cmd.Run(); err != nil {
 376                                                 ctx.LogE("rx", sds, err, "notify")
 377                                         }
 378                                 }
 379                         }
 380                 case PktTypeTrns:
 381                         if noTrns {
 382                                 goto Closing
 383                         }
 384                         dst := new([blake2b.Size256]byte)
 385                         copy(dst[:], pkt.Path[:int(pkt.PathLen)])
 386                         nodeId := NodeId(*dst)
 387                         node, known := ctx.Neigh[nodeId]
 388                         sds := SdsAdd(sds, SDS{"type": "trns", "dst": nodeId})
 389                         if !known {
 390                                 ctx.LogE("rx", sds, errors.New("unknown node"), "")
 391                                 isBad = true
 392                                 goto Closing
 393                         }
 394                         ctx.LogD("rx", sds, "taken")
 395                         if !dryRun {
 396                                 if err = ctx.TxTrns(node, job.PktEnc.Nice, pktSize, pipeR); err != nil {
 397                                         ctx.LogE("rx", sds, err, "tx trns")
 398                                         isBad = true
 399                                         goto Closing
 400                                 }
 401                         }
 402                         ctx.LogI("rx", sds, "")
 403                         if !dryRun {
 404                                 if doSeen {
 405                                         if fd, err := os.Create(job.Fd.Name() + SeenSuffix); err == nil {
 406                                                 fd.Close() // #nosec G104
 407                                         }
 408                                 }
 409                                 if err = os.Remove(job.Fd.Name()); err != nil {
 410                                         ctx.LogE("rx", sds, err, "remove")
 411                                         isBad = true
 412                                 }
 413                         }
 414                 default:
 415                         ctx.LogE("rx", sds, errors.New("unknown type"), "")
 416                         isBad = true
 417                 }
 418         Closing:
 419                 pipeR.Close() // #nosec G104
 420         }
 421         return isBad
 422 }