src/cmd/nncp-daemon/main.go

   1 /*
   2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
   3 Copyright (C) 2016-2023 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 // NNCP TCP daemon.
  19 package main
  20
  21 import (
  22         "flag"
  23         "fmt"
  24         "log"
  25         "net"
  26         "os"
  27         "regexp"
  28         "strconv"
  29         "strings"
  30         "time"
  31
  32         "github.com/dustin/go-humanize"
  33         "go.cypherpunks.ru/nncp/v8"
  34         nncpYggdrasil "go.cypherpunks.ru/nncp/v8/yggdrasil"
  35         "golang.org/x/net/netutil"
  36 )
  37
  38 func usage() {
  39         fmt.Fprint(os.Stderr, "nncp-daemon -- TCP daemon\n\n")
  40         fmt.Fprintf(os.Stderr, "Usage: %s [options]\nOptions:\n", os.Args[0])
  41         flag.PrintDefaults()
  42 }
  43
  44 func performSP(
  45         ctx *nncp.Ctx,
  46         conn nncp.ConnDeadlined,
  47         addr string,
  48         nice uint8,
  49         noCK bool,
  50         nodeIdC chan *nncp.NodeId,
  51 ) {
  52         state := nncp.SPState{
  53                 Ctx:  ctx,
  54                 Nice: nice,
  55                 NoCK: noCK,
  56         }
  57         if err := state.StartR(conn); err == nil {
  58                 ctx.LogI(
  59                         "call-started",
  60                         nncp.LEs{{K: "Node", V: state.Node.Id}},
  61                         func(les nncp.LEs) string {
  62                                 return fmt.Sprintf("Connection with %s (%s)", state.Node.Name, addr)
  63                         },
  64                 )
  65                 nodeIdC <- state.Node.Id
  66                 state.Wait()
  67                 ctx.LogI("call-finished", nncp.LEs{
  68                         {K: "Node", V: state.Node.Id},
  69                         {K: "Duration", V: int64(state.Duration.Seconds())},
  70                         {K: "RxBytes", V: state.RxBytes},
  71                         {K: "TxBytes", V: state.TxBytes},
  72                         {K: "RxSpeed", V: state.RxSpeed},
  73                         {K: "TxSpeed", V: state.TxSpeed},
  74                 }, func(les nncp.LEs) string {
  75                         return fmt.Sprintf(
  76                                 "Finished call with %s (%d:%d:%d): %s received (%s/sec), %s transferred (%s/sec)",
  77                                 state.Node.Name,
  78                                 int(state.Duration.Hours()),
  79                                 int(state.Duration.Minutes()),
  80                                 int(state.Duration.Seconds())%60,
  81                                 humanize.IBytes(uint64(state.RxBytes)),
  82                                 humanize.IBytes(uint64(state.RxSpeed)),
  83                                 humanize.IBytes(uint64(state.TxBytes)),
  84                                 humanize.IBytes(uint64(state.TxSpeed)),
  85                         )
  86                 })
  87         } else {
  88                 var nodeId string
  89                 var nodeName string
  90                 if state.Node == nil {
  91                         nodeId = "unknown"
  92                         nodeName = "unknown"
  93                         nodeIdC <- nil
  94                 } else {
  95                         nodeId = state.Node.Id.String()
  96                         nodeName = state.Node.Name
  97                         nodeIdC <- state.Node.Id
  98                 }
  99                 ctx.LogI(
 100                         "call-started",
 101                         nncp.LEs{{K: "Node", V: nodeId}},
 102                         func(les nncp.LEs) string { return "Connected to " + nodeName },
 103                 )
 104         }
 105         close(nodeIdC)
 106 }
 107
 108 func startMCDTx(ctx *nncp.Ctx, port int, zeroInterval bool) error {
 109         ifis, err := net.Interfaces()
 110         if err != nil {
 111                 return err
 112         }
 113         for ifiReString, secs := range ctx.MCDTxIfis {
 114                 ifiRe, err := regexp.CompilePOSIX(ifiReString)
 115                 if err != nil {
 116                         return err
 117                 }
 118                 var interval time.Duration
 119                 if !zeroInterval {
 120                         interval = time.Duration(secs) * time.Second
 121                 }
 122                 for _, ifi := range ifis {
 123                         if ifiRe.MatchString(ifi.Name) {
 124                                 if err = ctx.MCDTx(ifi.Name, port, interval); err != nil {
 125                                         return err
 126                                 }
 127                         }
 128                 }
 129         }
 130         return nil
 131 }
 132
 133 func main() {
 134         var (
 135                 cfgPath   = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
 136                 niceRaw   = flag.String("nice", nncp.NicenessFmt(255), "Minimal required niceness")
 137                 bind      = flag.String("bind", "[::]:5400", "Address to bind to")
 138                 ucspi     = flag.Bool("ucspi", false, "Is it started as UCSPI-TCP server")
 139                 inetd     = flag.Bool("inetd", false, "Obsolete, use -ucspi")
 140                 yggdrasil = flag.String("yggdrasil", "",
 141                         "Start Yggdrasil listener: yggdrasils://PRV[:PORT]?[bind=BIND][&pub=PUB][&peer=PEER][&mcast=REGEX[:PORT]]")
 142                 maxConn   = flag.Int("maxconn", 128, "Maximal number of simultaneous connections")
 143                 noCK      = flag.Bool("nock", false, "Do no checksum checking")
 144                 mcdOnce   = flag.Bool("mcd-once", false, "Send MCDs once and quit")
 145                 spoolPath = flag.String("spool", "", "Override path to spool")
 146                 logPath   = flag.String("log", "", "Override path to logfile")
 147                 quiet     = flag.Bool("quiet", false, "Print only errors")
 148                 showPrgrs = flag.Bool("progress", false, "Force progress showing")
 149                 omitPrgrs = flag.Bool("noprogress", false, "Omit progress showing")
 150                 debug     = flag.Bool("debug", false, "Print debug messages")
 151                 version   = flag.Bool("version", false, "Print version information")
 152                 warranty  = flag.Bool("warranty", false, "Print warranty information")
 153
 154                 autoToss = flag.Bool("autotoss", false,
 155                         "Toss after call is finished")
 156                 autoTossDoSeen = flag.Bool("autotoss-seen", false,
 157                         "Create seen/ files during tossing")
 158                 autoTossNoFile = flag.Bool("autotoss-nofile", false,
 159                         "Do not process \"file\" packets during tossing")
 160                 autoTossNoFreq = flag.Bool("autotoss-nofreq", false,
 161                         "Do not process \"freq\" packets during tossing")
 162                 autoTossNoExec = flag.Bool("autotoss-noexec", false,
 163                         "Do not process \"exec\" packets during tossing")
 164                 autoTossNoTrns = flag.Bool("autotoss-notrns", false,
 165                         "Do not process \"trns\" packets during tossing")
 166                 autoTossNoArea = flag.Bool("autotoss-noarea", false,
 167                         "Do not process \"area\" packets during tossing")
 168                 autoTossNoACK = flag.Bool("autotoss-noack", false,
 169                         "Do not process \"ack\" packets during tossing")
 170         )
 171         log.SetFlags(log.Lshortfile)
 172         flag.Usage = usage
 173         flag.Parse()
 174         if *warranty {
 175                 fmt.Println(nncp.Warranty)
 176                 return
 177         }
 178         if *version {
 179                 fmt.Println(nncp.VersionGet())
 180                 return
 181         }
 182         nice, err := nncp.NicenessParse(*niceRaw)
 183         if err != nil {
 184                 log.Fatalln(err)
 185         }
 186         if *inetd {
 187                 *ucspi = true
 188         }
 189
 190         ctx, err := nncp.CtxFromCmdline(
 191                 *cfgPath,
 192                 *spoolPath,
 193                 *logPath,
 194                 *quiet,
 195                 *showPrgrs,
 196                 *omitPrgrs,
 197                 *debug,
 198         )
 199         if err != nil {
 200                 log.Fatalln("Error during initialization:", err)
 201         }
 202         if ctx.Self == nil {
 203                 log.Fatalln("Config lacks private keys")
 204         }
 205         ctx.Umask()
 206
 207         if *ucspi {
 208                 os.Stderr.Close()
 209                 conn := &nncp.UCSPIConn{R: os.Stdin, W: os.Stdout}
 210                 nodeIdC := make(chan *nncp.NodeId)
 211                 addr := nncp.UCSPITCPRemoteAddr()
 212                 if addr == "" {
 213                         addr = "PIPE"
 214                 }
 215                 go performSP(ctx, conn, addr, nice, *noCK, nodeIdC)
 216                 nodeId := <-nodeIdC
 217                 var autoTossFinish chan struct{}
 218                 var autoTossBadCode chan bool
 219                 if *autoToss && nodeId != nil {
 220                         autoTossFinish, autoTossBadCode = ctx.AutoToss(
 221                                 nodeId,
 222                                 &nncp.TossOpts{
 223                                         Nice:   nice,
 224                                         DoSeen: *autoTossDoSeen,
 225                                         NoFile: *autoTossNoFile,
 226                                         NoFreq: *autoTossNoFreq,
 227                                         NoExec: *autoTossNoExec,
 228                                         NoTrns: *autoTossNoTrns,
 229                                         NoArea: *autoTossNoArea,
 230                                         NoACK:  *autoTossNoACK,
 231                                 },
 232                         )
 233                 }
 234                 <-nodeIdC // call completion
 235                 if *autoToss && nodeId != nil {
 236                         close(autoTossFinish)
 237                         <-autoTossBadCode
 238                 }
 239                 conn.Close()
 240                 return
 241         }
 242
 243         conns := make(chan net.Conn)
 244         if *bind != "" {
 245                 cols := strings.Split(*bind, ":")
 246                 port, err := strconv.Atoi(cols[len(cols)-1])
 247                 if err != nil {
 248                         log.Fatalln("Can not parse port:", err)
 249                 }
 250
 251                 if *mcdOnce {
 252                         if err = startMCDTx(ctx, port, true); err != nil {
 253                                 log.Fatalln("Can not do MCD transmission:", err)
 254                         }
 255                         return
 256                 }
 257
 258                 ln, err := net.Listen("tcp", *bind)
 259                 if err != nil {
 260                         log.Fatalln("Can not listen:", err)
 261                 }
 262                 if err = startMCDTx(ctx, port, false); err != nil {
 263                         log.Fatalln("Can not do MCD transmission:", err)
 264                 }
 265                 ln = netutil.LimitListener(ln, *maxConn)
 266                 go func() {
 267                         for {
 268                                 conn, err := ln.Accept()
 269                                 if err != nil {
 270                                         log.Fatalln("Can not accept connection on TCP:", err)
 271                                 }
 272                                 conns <- conn
 273                         }
 274                 }()
 275         }
 276
 277         if *yggdrasil != "" {
 278                 ln, err := nncpYggdrasil.NewListener(ctx.YggdrasilAliases, *yggdrasil)
 279                 if err != nil {
 280                         log.Fatalln("Can not listen:", err)
 281                 }
 282                 ln = netutil.LimitListener(ln, *maxConn)
 283                 go func() {
 284                         for {
 285                                 conn, err := ln.Accept()
 286                                 if err != nil {
 287                                         log.Fatalln("Can not accept connection on Yggdrasil:", err)
 288                                 }
 289                                 conns <- conn
 290                         }
 291                 }()
 292         }
 293
 294         for conn := range conns {
 295                 ctx.LogD(
 296                         "daemon-accepted",
 297                         nncp.LEs{{K: "Addr", V: conn.RemoteAddr()}},
 298                         func(les nncp.LEs) string {
 299                                 return "Accepted connection with " + conn.RemoteAddr().String()
 300                         },
 301                 )
 302                 go func(conn net.Conn) {
 303                         nodeIdC := make(chan *nncp.NodeId)
 304                         go performSP(ctx, conn, conn.RemoteAddr().String(), nice, *noCK, nodeIdC)
 305                         nodeId := <-nodeIdC
 306                         var autoTossFinish chan struct{}
 307                         var autoTossBadCode chan bool
 308                         if *autoToss && nodeId != nil {
 309                                 autoTossFinish, autoTossBadCode = ctx.AutoToss(
 310                                         nodeId,
 311                                         &nncp.TossOpts{
 312                                                 Nice:   nice,
 313                                                 DoSeen: *autoTossDoSeen,
 314                                                 NoFile: *autoTossNoFile,
 315                                                 NoFreq: *autoTossNoFreq,
 316                                                 NoExec: *autoTossNoExec,
 317                                                 NoTrns: *autoTossNoTrns,
 318                                                 NoArea: *autoTossNoArea,
 319                                                 NoACK:  *autoTossNoACK,
 320                                         },
 321                                 )
 322                         }
 323                         <-nodeIdC // call completion
 324                         if *autoToss && nodeId != nil {
 325                                 close(autoTossFinish)
 326                                 <-autoTossBadCode
 327                         }
 328                         conn.Close()
 329                 }(conn)
 330
 331         }
 332 }