src/cmd/nncp-daemon/main.go

   1 /*
   2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
   3 Copyright (C) 2016-2022 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.Fprintf(os.Stderr, nncp.UsageHeader())
  40         fmt.Fprintf(os.Stderr, "nncp-daemon -- TCP daemon\n\n")
  41         fmt.Fprintf(os.Stderr, "Usage: %s [options]\nOptions:\n", os.Args[0])
  42         flag.PrintDefaults()
  43 }
  44
  45 func performSP(
  46         ctx *nncp.Ctx,
  47         conn nncp.ConnDeadlined,
  48         addr string,
  49         nice uint8,
  50         noCK bool,
  51         nodeIdC chan *nncp.NodeId,
  52 ) {
  53         state := nncp.SPState{
  54                 Ctx:  ctx,
  55                 Nice: nice,
  56                 NoCK: noCK,
  57         }
  58         if err := state.StartR(conn); err == nil {
  59                 ctx.LogI(
  60                         "call-started",
  61                         nncp.LEs{{K: "Node", V: state.Node.Id}},
  62                         func(les nncp.LEs) string {
  63                                 return fmt.Sprintf("Connection with %s (%s)", state.Node.Name, addr)
  64                         },
  65                 )
  66                 nodeIdC <- state.Node.Id
  67                 state.Wait()
  68                 ctx.LogI("call-finished", nncp.LEs{
  69                         {K: "Node", V: state.Node.Id},
  70                         {K: "Duration", V: int64(state.Duration.Seconds())},
  71                         {K: "RxBytes", V: state.RxBytes},
  72                         {K: "TxBytes", V: state.TxBytes},
  73                         {K: "RxSpeed", V: state.RxSpeed},
  74                         {K: "TxSpeed", V: state.TxSpeed},
  75                 }, func(les nncp.LEs) string {
  76                         return fmt.Sprintf(
  77                                 "Finished call with %s (%d:%d:%d): %s received (%s/sec), %s transferred (%s/sec)",
  78                                 state.Node.Name,
  79                                 int(state.Duration.Hours()),
  80                                 int(state.Duration.Minutes()),
  81                                 int(state.Duration.Seconds())%60,
  82                                 humanize.IBytes(uint64(state.RxBytes)),
  83                                 humanize.IBytes(uint64(state.RxSpeed)),
  84                                 humanize.IBytes(uint64(state.TxBytes)),
  85                                 humanize.IBytes(uint64(state.TxSpeed)),
  86                         )
  87                 })
  88         } else {
  89                 var nodeId string
  90                 var nodeName string
  91                 if state.Node == nil {
  92                         nodeId = "unknown"
  93                         nodeName = "unknown"
  94                         nodeIdC <- nil
  95                 } else {
  96                         nodeId = state.Node.Id.String()
  97                         nodeName = state.Node.Name
  98                         nodeIdC <- state.Node.Id
  99                 }
 100                 ctx.LogI(
 101                         "call-started",
 102                         nncp.LEs{{K: "Node", V: nodeId}},
 103                         func(les nncp.LEs) string { return "Connected to " + nodeName },
 104                 )
 105         }
 106         close(nodeIdC)
 107 }
 108
 109 func startMCDTx(ctx *nncp.Ctx, port int, zeroInterval bool) error {
 110         ifis, err := net.Interfaces()
 111         if err != nil {
 112                 return err
 113         }
 114         for ifiReString, secs := range ctx.MCDTxIfis {
 115                 ifiRe, err := regexp.CompilePOSIX(ifiReString)
 116                 if err != nil {
 117                         return err
 118                 }
 119                 var interval time.Duration
 120                 if !zeroInterval {
 121                         interval = time.Duration(secs) * time.Second
 122                 }
 123                 for _, ifi := range ifis {
 124                         if ifiRe.MatchString(ifi.Name) {
 125                                 if err = ctx.MCDTx(ifi.Name, port, interval); err != nil {
 126                                         return err
 127                                 }
 128                         }
 129                 }
 130         }
 131         return nil
 132 }
 133
 134 func main() {
 135         var (
 136                 cfgPath   = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
 137                 niceRaw   = flag.String("nice", nncp.NicenessFmt(255), "Minimal required niceness")
 138                 bind      = flag.String("bind", "[::]:5400", "Address to bind to")
 139                 ucspi     = flag.Bool("ucspi", false, "Is it started as UCSPI-TCP server")
 140                 inetd     = flag.Bool("inetd", false, "Obsolete, use -ucspi")
 141                 yggdrasil = flag.String("yggdrasil", "", "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, "Toss after call is finished")
 155                 autoTossDoSeen = flag.Bool("autotoss-seen", false, "Create seen/ files during tossing")
 156                 autoTossNoFile = flag.Bool("autotoss-nofile", false, "Do not process \"file\" packets during tossing")
 157                 autoTossNoFreq = flag.Bool("autotoss-nofreq", false, "Do not process \"freq\" packets during tossing")
 158                 autoTossNoExec = flag.Bool("autotoss-noexec", false, "Do not process \"exec\" packets during tossing")
 159                 autoTossNoTrns = flag.Bool("autotoss-notrns", false, "Do not process \"trns\" packets during tossing")
 160                 autoTossNoArea = flag.Bool("autotoss-noarea", false, "Do not process \"area\" packets during tossing")
 161         )
 162         log.SetFlags(log.Lshortfile)
 163         flag.Usage = usage
 164         flag.Parse()
 165         if *warranty {
 166                 fmt.Println(nncp.Warranty)
 167                 return
 168         }
 169         if *version {
 170                 fmt.Println(nncp.VersionGet())
 171                 return
 172         }
 173         nice, err := nncp.NicenessParse(*niceRaw)
 174         if err != nil {
 175                 log.Fatalln(err)
 176         }
 177         if *inetd {
 178                 *ucspi = true
 179         }
 180
 181         ctx, err := nncp.CtxFromCmdline(
 182                 *cfgPath,
 183                 *spoolPath,
 184                 *logPath,
 185                 *quiet,
 186                 *showPrgrs,
 187                 *omitPrgrs,
 188                 *debug,
 189         )
 190         if err != nil {
 191                 log.Fatalln("Error during initialization:", err)
 192         }
 193         if ctx.Self == nil {
 194                 log.Fatalln("Config lacks private keys")
 195         }
 196         ctx.Umask()
 197
 198         if *ucspi {
 199                 os.Stderr.Close()
 200                 conn := &nncp.UCSPIConn{R: os.Stdin, W: os.Stdout}
 201                 nodeIdC := make(chan *nncp.NodeId)
 202                 addr := nncp.UCSPITCPRemoteAddr()
 203                 if addr == "" {
 204                         addr = "PIPE"
 205                 }
 206                 go performSP(ctx, conn, addr, nice, *noCK, nodeIdC)
 207                 nodeId := <-nodeIdC
 208                 var autoTossFinish chan struct{}
 209                 var autoTossBadCode chan bool
 210                 if *autoToss && nodeId != nil {
 211                         autoTossFinish, autoTossBadCode = ctx.AutoToss(
 212                                 nodeId,
 213                                 nice,
 214                                 *autoTossDoSeen,
 215                                 *autoTossNoFile,
 216                                 *autoTossNoFreq,
 217                                 *autoTossNoExec,
 218                                 *autoTossNoTrns,
 219                                 *autoTossNoArea,
 220                         )
 221                 }
 222                 <-nodeIdC // call completion
 223                 if *autoToss {
 224                         close(autoTossFinish)
 225                         <-autoTossBadCode
 226                 }
 227                 conn.Close()
 228                 return
 229         }
 230
 231         conns := make(chan net.Conn)
 232         if *bind != "" {
 233                 cols := strings.Split(*bind, ":")
 234                 port, err := strconv.Atoi(cols[len(cols)-1])
 235                 if err != nil {
 236                         log.Fatalln("Can not parse port:", err)
 237                 }
 238
 239                 if *mcdOnce {
 240                         if err = startMCDTx(ctx, port, true); err != nil {
 241                                 log.Fatalln("Can not do MCD transmission:", err)
 242                         }
 243                         return
 244                 }
 245
 246                 ln, err := net.Listen("tcp", *bind)
 247                 if err != nil {
 248                         log.Fatalln("Can not listen:", err)
 249                 }
 250                 if err = startMCDTx(ctx, port, false); err != nil {
 251                         log.Fatalln("Can not do MCD transmission:", err)
 252                 }
 253                 ln = netutil.LimitListener(ln, *maxConn)
 254                 go func() {
 255                         for {
 256                                 conn, err := ln.Accept()
 257                                 if err != nil {
 258                                         log.Fatalln("Can not accept connection on TCP:", err)
 259                                 }
 260                                 conns <- conn
 261                         }
 262                 }()
 263         }
 264
 265         if *yggdrasil != "" {
 266                 ln, err := nncpYggdrasil.NewListener(ctx.YggdrasilAliases, *yggdrasil)
 267                 if err != nil {
 268                         log.Fatalln("Can not listen:", err)
 269                 }
 270                 ln = netutil.LimitListener(ln, *maxConn)
 271                 go func() {
 272                         for {
 273                                 conn, err := ln.Accept()
 274                                 if err != nil {
 275                                         log.Fatalln("Can not accept connection on Yggdrasil:", err)
 276                                 }
 277                                 conns <- conn
 278                         }
 279                 }()
 280         }
 281
 282         for conn := range conns {
 283                 ctx.LogD(
 284                         "daemon-accepted",
 285                         nncp.LEs{{K: "Addr", V: conn.RemoteAddr()}},
 286                         func(les nncp.LEs) string {
 287                                 return "Accepted connection with " + conn.RemoteAddr().String()
 288                         },
 289                 )
 290                 go func(conn net.Conn) {
 291                         nodeIdC := make(chan *nncp.NodeId)
 292                         go performSP(ctx, conn, conn.RemoteAddr().String(), nice, *noCK, nodeIdC)
 293                         nodeId := <-nodeIdC
 294                         var autoTossFinish chan struct{}
 295                         var autoTossBadCode chan bool
 296                         if *autoToss && nodeId != nil {
 297                                 autoTossFinish, autoTossBadCode = ctx.AutoToss(
 298                                         nodeId,
 299                                         nice,
 300                                         *autoTossDoSeen,
 301                                         *autoTossNoFile,
 302                                         *autoTossNoFreq,
 303                                         *autoTossNoExec,
 304                                         *autoTossNoTrns,
 305                                         *autoTossNoArea,
 306                                 )
 307                         }
 308                         <-nodeIdC // call completion
 309                         if *autoToss {
 310                                 close(autoTossFinish)
 311                                 <-autoTossBadCode
 312                         }
 313                         conn.Close()
 314                 }(conn)
 315
 316         }
 317 }