src/toss.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 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         isBad := false
  72         sendmail := ctx.Neigh[*ctx.SelfId].Exec["sendmail"]
  73         decompressor, err := zstd.NewReader(nil)
  74         if err != nil {
  75                 panic(err)
  76         }
  77         defer decompressor.Close()
  78         for job := range ctx.Jobs(nodeId, TRx) {
  79                 pktName := filepath.Base(job.Fd.Name())
  80                 sds := SDS{"node": job.PktEnc.Sender, "pkt": pktName}
  81                 if job.PktEnc.Nice > nice {
  82                         ctx.LogD("rx", SdsAdd(sds, SDS{"nice": int(job.PktEnc.Nice)}), "too nice")
  83                         continue
  84                 }
  85                 pipeR, pipeW := io.Pipe()
  86                 errs := make(chan error, 1)
  87                 go func(job Job) {
  88                         pipeWB := bufio.NewWriter(pipeW)
  89                         _, _, err := PktEncRead(
  90                                 ctx.Self,
  91                                 ctx.Neigh,
  92                                 bufio.NewReader(job.Fd),
  93                                 pipeWB,
  94                         )
  95                         errs <- err
  96                         pipeWB.Flush()
  97                         pipeW.Close()
  98                         job.Fd.Close()
  99                         if err != nil {
 100                                 ctx.LogE("rx", sds, err, "decryption")
 101                         }
 102                 }(job)
 103                 var pkt Pkt
 104                 var err error
 105                 var pktSize int64
 106                 var pktSizeBlocks int64
 107                 if _, err = xdr.Unmarshal(pipeR, &pkt); err != nil {
 108                         ctx.LogE("rx", sds, err, "unmarshal")
 109                         isBad = true
 110                         goto Closing
 111                 }
 112                 pktSize = job.Size - PktEncOverhead - PktOverhead - PktSizeOverhead
 113                 pktSizeBlocks = pktSize / (EncBlkSize + poly1305.TagSize)
 114                 if pktSize%(EncBlkSize+poly1305.TagSize) != 0 {
 115                         pktSize -= poly1305.TagSize
 116                 }
 117                 pktSize -= pktSizeBlocks * poly1305.TagSize
 118                 sds["size"] = pktSize
 119                 ctx.LogD("rx", sds, "taken")
 120                 switch pkt.Type {
 121                 case PktTypeExec:
 122                         if noExec {
 123                                 goto Closing
 124                         }
 125                         path := bytes.Split(pkt.Path[:int(pkt.PathLen)], []byte{0})
 126                         handle := string(path[0])
 127                         args := make([]string, 0, len(path)-1)
 128                         for _, p := range path[1:] {
 129                                 args = append(args, string(p))
 130                         }
 131                         argsStr := strings.Join(append([]string{handle}, args...), " ")
 132                         sds := SdsAdd(sds, SDS{
 133                                 "type": "exec",
 134                                 "dst":  argsStr,
 135                         })
 136                         sender := ctx.Neigh[*job.PktEnc.Sender]
 137                         cmdline, exists := sender.Exec[handle]
 138                         if !exists || len(cmdline) == 0 {
 139                                 ctx.LogE("rx", sds, errors.New("No handle found"), "")
 140                                 isBad = true
 141                                 goto Closing
 142                         }
 143                         if err = decompressor.Reset(pipeR); err != nil {
 144                                 log.Fatalln(err)
 145                         }
 146                         if !dryRun {
 147                                 cmd := exec.Command(
 148                                         cmdline[0],
 149                                         append(cmdline[1:len(cmdline)], args...)...,
 150                                 )
 151                                 cmd.Env = append(
 152                                         cmd.Env,
 153                                         "NNCP_SELF="+ctx.Self.Id.String(),
 154                                         "NNCP_SENDER="+sender.Id.String(),
 155                                         "NNCP_NICE="+strconv.Itoa(int(pkt.Nice)),
 156                                 )
 157                                 cmd.Stdin = decompressor
 158                                 output, err := cmd.Output()
 159                                 if err != nil {
 160                                         ctx.LogE("rx", sds, err, "handle")
 161                                         isBad = true
 162                                         goto Closing
 163                                 }
 164                                 if len(sendmail) > 0 && ctx.NotifyExec != nil {
 165                                         notify, exists := ctx.NotifyExec[sender.Name+"."+handle]
 166                                         if !exists {
 167                                                 notify, exists = ctx.NotifyExec["*."+handle]
 168                                         }
 169                                         if exists {
 170                                                 cmd := exec.Command(
 171                                                         sendmail[0],
 172                                                         append(sendmail[1:len(sendmail)], notify.To)...,
 173                                                 )
 174                                                 cmd.Stdin = newNotification(notify, fmt.Sprintf(
 175                                                         "Exec from %s: %s", sender.Name, argsStr,
 176                                                 ), output)
 177                                                 cmd.Run()
 178                                         }
 179                                 }
 180                         }
 181                         ctx.LogI("rx", sds, "")
 182                         if !dryRun {
 183                                 if doSeen {
 184                                         if fd, err := os.Create(job.Fd.Name() + SeenSuffix); err == nil {
 185                                                 fd.Close()
 186                                         }
 187                                 }
 188                                 if err = os.Remove(job.Fd.Name()); err != nil {
 189                                         ctx.LogE("rx", sds, err, "remove")
 190                                         isBad = true
 191                                 }
 192                         }
 193                 case PktTypeFile:
 194                         if noFile {
 195                                 goto Closing
 196                         }
 197                         dst := string(pkt.Path[:int(pkt.PathLen)])
 198                         sds := SdsAdd(sds, SDS{"type": "file", "dst": dst})
 199                         if filepath.IsAbs(dst) {
 200                                 ctx.LogE("rx", sds, errors.New("non-relative destination path"), "")
 201                                 isBad = true
 202                                 goto Closing
 203                         }
 204                         incoming := ctx.Neigh[*job.PktEnc.Sender].Incoming
 205                         if incoming == nil {
 206                                 ctx.LogE("rx", sds, errors.New("incoming is not allowed"), "")
 207                                 isBad = true
 208                                 goto Closing
 209                         }
 210                         dir := filepath.Join(*incoming, path.Dir(dst))
 211                         if err = os.MkdirAll(dir, os.FileMode(0777)); err != nil {
 212                                 ctx.LogE("rx", sds, err, "mkdir")
 213                                 isBad = true
 214                                 goto Closing
 215                         }
 216                         if !dryRun {
 217                                 tmp, err := TempFile(dir, "file")
 218                                 if err != nil {
 219                                         ctx.LogE("rx", sds, err, "mktemp")
 220                                         isBad = true
 221                                         goto Closing
 222                                 }
 223                                 sds["tmp"] = tmp.Name()
 224                                 ctx.LogD("rx", sds, "created")
 225                                 bufW := bufio.NewWriter(tmp)
 226                                 if _, err = CopyProgressed(
 227                                         bufW,
 228                                         pipeR,
 229                                         SdsAdd(sds, SDS{"fullsize": sds["size"]}),
 230                                         ctx.ShowPrgrs,
 231                                 ); err != nil {
 232                                         ctx.LogE("rx", sds, err, "copy")
 233                                         isBad = true
 234                                         goto Closing
 235                                 }
 236                                 if err = bufW.Flush(); err != nil {
 237                                         tmp.Close()
 238                                         ctx.LogE("rx", sds, err, "copy")
 239                                         isBad = true
 240                                         goto Closing
 241                                 }
 242                                 if err = tmp.Sync(); err != nil {
 243                                         tmp.Close()
 244                                         ctx.LogE("rx", sds, err, "copy")
 245                                         isBad = true
 246                                         goto Closing
 247                                 }
 248                                 tmp.Close()
 249                                 dstPathOrig := filepath.Join(*incoming, dst)
 250                                 dstPath := dstPathOrig
 251                                 dstPathCtr := 0
 252                                 for {
 253                                         if _, err = os.Stat(dstPath); err != nil {
 254                                                 if os.IsNotExist(err) {
 255                                                         break
 256                                                 }
 257                                                 ctx.LogE("rx", sds, err, "stat")
 258                                                 isBad = true
 259                                                 goto Closing
 260                                         }
 261                                         dstPath = dstPathOrig + "." + strconv.Itoa(dstPathCtr)
 262                                         dstPathCtr++
 263                                 }
 264                                 if err = os.Rename(tmp.Name(), dstPath); err != nil {
 265                                         ctx.LogE("rx", sds, err, "rename")
 266                                         isBad = true
 267                                 }
 268                                 if err = DirSync(*incoming); err != nil {
 269                                         ctx.LogE("rx", sds, err, "sync")
 270                                         isBad = true
 271                                 }
 272                                 delete(sds, "tmp")
 273                         }
 274                         ctx.LogI("rx", sds, "")
 275                         if !dryRun {
 276                                 if doSeen {
 277                                         if fd, err := os.Create(job.Fd.Name() + SeenSuffix); err == nil {
 278                                                 fd.Close()
 279                                         }
 280                                 }
 281                                 if err = os.Remove(job.Fd.Name()); err != nil {
 282                                         ctx.LogE("rx", sds, err, "remove")
 283                                         isBad = true
 284                                 }
 285                                 if len(sendmail) > 0 && ctx.NotifyFile != nil {
 286                                         cmd := exec.Command(
 287                                                 sendmail[0],
 288                                                 append(sendmail[1:len(sendmail)], ctx.NotifyFile.To)...,
 289                                         )
 290                                         cmd.Stdin = newNotification(ctx.NotifyFile, fmt.Sprintf(
 291                                                 "File from %s: %s (%s)",
 292                                                 ctx.Neigh[*job.PktEnc.Sender].Name,
 293                                                 dst,
 294                                                 humanize.IBytes(uint64(pktSize)),
 295                                         ), nil)
 296                                         cmd.Run()
 297                                 }
 298                         }
 299                 case PktTypeFreq:
 300                         if noFreq {
 301                                 goto Closing
 302                         }
 303                         src := string(pkt.Path[:int(pkt.PathLen)])
 304                         if filepath.IsAbs(src) {
 305                                 ctx.LogE("rx", sds, errors.New("non-relative source path"), "")
 306                                 isBad = true
 307                                 goto Closing
 308                         }
 309                         sds := SdsAdd(sds, SDS{"type": "freq", "src": src})
 310                         dstRaw, err := ioutil.ReadAll(pipeR)
 311                         if err != nil {
 312                                 ctx.LogE("rx", sds, err, "read")
 313                                 isBad = true
 314                                 goto Closing
 315                         }
 316                         dst := string(dstRaw)
 317                         sds["dst"] = dst
 318                         sender := ctx.Neigh[*job.PktEnc.Sender]
 319                         freqPath := sender.FreqPath
 320                         if freqPath == nil {
 321                                 ctx.LogE("rx", sds, errors.New("freqing is not allowed"), "")
 322                                 isBad = true
 323                                 goto Closing
 324                         }
 325                         if !dryRun {
 326                                 err = ctx.TxFile(
 327                                         sender,
 328                                         pkt.Nice,
 329                                         filepath.Join(*freqPath, src),
 330                                         dst,
 331                                         sender.FreqChunked,
 332                                         sender.FreqMinSize,
 333                                         sender.FreqMaxSize,
 334                                 )
 335                                 if err != nil {
 336                                         ctx.LogE("rx", sds, err, "tx file")
 337                                         isBad = true
 338                                         goto Closing
 339                                 }
 340                         }
 341                         ctx.LogI("rx", sds, "")
 342                         if !dryRun {
 343                                 if doSeen {
 344                                         if fd, err := os.Create(job.Fd.Name() + SeenSuffix); err == nil {
 345                                                 fd.Close()
 346                                         }
 347                                 }
 348                                 if err = os.Remove(job.Fd.Name()); err != nil {
 349                                         ctx.LogE("rx", sds, err, "remove")
 350                                         isBad = true
 351                                 }
 352                                 if len(sendmail) > 0 && ctx.NotifyFreq != nil {
 353                                         cmd := exec.Command(
 354                                                 sendmail[0],
 355                                                 append(sendmail[1:len(sendmail)], ctx.NotifyFreq.To)...,
 356                                         )
 357                                         cmd.Stdin = newNotification(ctx.NotifyFreq, fmt.Sprintf(
 358                                                 "Freq from %s: %s", sender.Name, src,
 359                                         ), nil)
 360                                         cmd.Run()
 361                                 }
 362                         }
 363                 case PktTypeTrns:
 364                         if noTrns {
 365                                 goto Closing
 366                         }
 367                         dst := new([blake2b.Size256]byte)
 368                         copy(dst[:], pkt.Path[:int(pkt.PathLen)])
 369                         nodeId := NodeId(*dst)
 370                         node, known := ctx.Neigh[nodeId]
 371                         sds := SdsAdd(sds, SDS{"type": "trns", "dst": nodeId})
 372                         if !known {
 373                                 ctx.LogE("rx", sds, errors.New("unknown node"), "")
 374                                 isBad = true
 375                                 goto Closing
 376                         }
 377                         ctx.LogD("rx", sds, "taken")
 378                         if !dryRun {
 379                                 if err = ctx.TxTrns(node, job.PktEnc.Nice, pktSize, pipeR); err != nil {
 380                                         ctx.LogE("rx", sds, err, "tx trns")
 381                                         isBad = true
 382                                         goto Closing
 383                                 }
 384                         }
 385                         ctx.LogI("rx", sds, "")
 386                         if !dryRun {
 387                                 if doSeen {
 388                                         if fd, err := os.Create(job.Fd.Name() + SeenSuffix); err == nil {
 389                                                 fd.Close()
 390                                         }
 391                                 }
 392                                 if err = os.Remove(job.Fd.Name()); err != nil {
 393                                         ctx.LogE("rx", sds, err, "remove")
 394                                         isBad = true
 395                                 }
 396                         }
 397                 default:
 398                         ctx.LogE("rx", sds, errors.New("unknown type"), "")
 399                         isBad = true
 400                 }
 401         Closing:
 402                 pipeR.Close()
 403         }
 404         return isBad
 405 }