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         "strconv"
  28         "strings"
  29         "time"
  30
  31         "github.com/dustin/go-humanize"
  32         "go.cypherpunks.ru/nncp/v8"
  33         nncpYggdrasil "go.cypherpunks.ru/nncp/v8/yggdrasil"
  34         "golang.org/x/net/netutil"
  35 )
  36
  37 func usage() {
  38         fmt.Fprintf(os.Stderr, nncp.UsageHeader())
  39         fmt.Fprintf(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 main() {
 109         var (
 110                 cfgPath   = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
 111                 niceRaw   = flag.String("nice", nncp.NicenessFmt(255), "Minimal required niceness")
 112                 bind      = flag.String("bind", "[::]:5400", "Address to bind to")
 113                 ucspi     = flag.Bool("ucspi", false, "Is it started as UCSPI-TCP server")
 114                 inetd     = flag.Bool("inetd", false, "Obsolete, use -ucspi")
 115                 yggdrasil = flag.String("yggdrasil", "", "Start Yggdrasil listener: yggdrasils://PRV[:PORT]?[bind=BIND][&pub=PUB][&peer=PEER][&mcast=REGEX[:PORT]]")
 116                 maxConn   = flag.Int("maxconn", 128, "Maximal number of simultaneous connections")
 117                 noCK      = flag.Bool("nock", false, "Do no checksum checking")
 118                 mcdOnce   = flag.Bool("mcd-once", false, "Send MCDs once and quit")
 119                 spoolPath = flag.String("spool", "", "Override path to spool")
 120                 logPath   = flag.String("log", "", "Override path to logfile")
 121                 quiet     = flag.Bool("quiet", false, "Print only errors")
 122                 showPrgrs = flag.Bool("progress", false, "Force progress showing")
 123                 omitPrgrs = flag.Bool("noprogress", false, "Omit progress showing")
 124                 debug     = flag.Bool("debug", false, "Print debug messages")
 125                 version   = flag.Bool("version", false, "Print version information")
 126                 warranty  = flag.Bool("warranty", false, "Print warranty information")
 127
 128                 autoToss       = flag.Bool("autotoss", false, "Toss after call is finished")
 129                 autoTossDoSeen = flag.Bool("autotoss-seen", false, "Create seen/ files during tossing")
 130                 autoTossNoFile = flag.Bool("autotoss-nofile", false, "Do not process \"file\" packets during tossing")
 131                 autoTossNoFreq = flag.Bool("autotoss-nofreq", false, "Do not process \"freq\" packets during tossing")
 132                 autoTossNoExec = flag.Bool("autotoss-noexec", false, "Do not process \"exec\" packets during tossing")
 133                 autoTossNoTrns = flag.Bool("autotoss-notrns", false, "Do not process \"trns\" packets during tossing")
 134                 autoTossNoArea = flag.Bool("autotoss-noarea", false, "Do not process \"area\" packets during tossing")
 135         )
 136         log.SetFlags(log.Lshortfile)
 137         flag.Usage = usage
 138         flag.Parse()
 139         if *warranty {
 140                 fmt.Println(nncp.Warranty)
 141                 return
 142         }
 143         if *version {
 144                 fmt.Println(nncp.VersionGet())
 145                 return
 146         }
 147         nice, err := nncp.NicenessParse(*niceRaw)
 148         if err != nil {
 149                 log.Fatalln(err)
 150         }
 151         if *inetd {
 152                 *ucspi = true
 153         }
 154
 155         ctx, err := nncp.CtxFromCmdline(
 156                 *cfgPath,
 157                 *spoolPath,
 158                 *logPath,
 159                 *quiet,
 160                 *showPrgrs,
 161                 *omitPrgrs,
 162                 *debug,
 163         )
 164         if err != nil {
 165                 log.Fatalln("Error during initialization:", err)
 166         }
 167         if ctx.Self == nil {
 168                 log.Fatalln("Config lacks private keys")
 169         }
 170         ctx.Umask()
 171
 172         if *ucspi {
 173                 os.Stderr.Close()
 174                 conn := &nncp.UCSPIConn{R: os.Stdin, W: os.Stdout}
 175                 nodeIdC := make(chan *nncp.NodeId)
 176                 addr := nncp.UCSPITCPRemoteAddr()
 177                 if addr == "" {
 178                         addr = "PIPE"
 179                 }
 180                 go performSP(ctx, conn, addr, nice, *noCK, nodeIdC)
 181                 nodeId := <-nodeIdC
 182                 var autoTossFinish chan struct{}
 183                 var autoTossBadCode chan bool
 184                 if *autoToss && nodeId != nil {
 185                         autoTossFinish, autoTossBadCode = ctx.AutoToss(
 186                                 nodeId,
 187                                 nice,
 188                                 *autoTossDoSeen,
 189                                 *autoTossNoFile,
 190                                 *autoTossNoFreq,
 191                                 *autoTossNoExec,
 192                                 *autoTossNoTrns,
 193                                 *autoTossNoArea,
 194                         )
 195                 }
 196                 <-nodeIdC // call completion
 197                 if *autoToss {
 198                         close(autoTossFinish)
 199                         <-autoTossBadCode
 200                 }
 201                 conn.Close()
 202                 return
 203         }
 204
 205         conns := make(chan net.Conn)
 206         if *bind != "" {
 207                 cols := strings.Split(*bind, ":")
 208                 port, err := strconv.Atoi(cols[len(cols)-1])
 209                 if err != nil {
 210                         log.Fatalln("Can not parse port:", err)
 211                 }
 212
 213                 if *mcdOnce {
 214                         for ifiName := range ctx.MCDTxIfis {
 215                                 if err = ctx.MCDTx(ifiName, port, 0); err != nil {
 216                                         log.Fatalln("Can not do MCD transmission:", err)
 217                                 }
 218                         }
 219                         return
 220                 }
 221
 222                 ln, err := net.Listen("tcp", *bind)
 223                 if err != nil {
 224                         log.Fatalln("Can not listen:", err)
 225                 }
 226
 227                 for ifiName, secs := range ctx.MCDTxIfis {
 228                         if err = ctx.MCDTx(ifiName, port, time.Duration(secs)*time.Second); err != nil {
 229                                 log.Fatalln("Can not run MCD transmission:", err)
 230                         }
 231                 }
 232
 233                 ln = netutil.LimitListener(ln, *maxConn)
 234                 go func() {
 235                         for {
 236                                 conn, err := ln.Accept()
 237                                 if err != nil {
 238                                         log.Fatalln("Can not accept connection on TCP:", err)
 239                                 }
 240                                 conns <- conn
 241                         }
 242                 }()
 243         }
 244
 245         if *yggdrasil != "" {
 246                 ln, err := nncpYggdrasil.NewListener(ctx.YggdrasilAliases, *yggdrasil)
 247                 if err != nil {
 248                         log.Fatalln("Can not listen:", err)
 249                 }
 250                 ln = netutil.LimitListener(ln, *maxConn)
 251                 go func() {
 252                         for {
 253                                 conn, err := ln.Accept()
 254                                 if err != nil {
 255                                         log.Fatalln("Can not accept connection on Yggdrasil:", err)
 256                                 }
 257                                 conns <- conn
 258                         }
 259                 }()
 260         }
 261
 262         for conn := range conns {
 263                 ctx.LogD(
 264                         "daemon-accepted",
 265                         nncp.LEs{{K: "Addr", V: conn.RemoteAddr()}},
 266                         func(les nncp.LEs) string {
 267                                 return "Accepted connection with " + conn.RemoteAddr().String()
 268                         },
 269                 )
 270                 go func(conn net.Conn) {
 271                         nodeIdC := make(chan *nncp.NodeId)
 272                         go performSP(ctx, conn, conn.RemoteAddr().String(), nice, *noCK, nodeIdC)
 273                         nodeId := <-nodeIdC
 274                         var autoTossFinish chan struct{}
 275                         var autoTossBadCode chan bool
 276                         if *autoToss && nodeId != nil {
 277                                 autoTossFinish, autoTossBadCode = ctx.AutoToss(
 278                                         nodeId,
 279                                         nice,
 280                                         *autoTossDoSeen,
 281                                         *autoTossNoFile,
 282                                         *autoTossNoFreq,
 283                                         *autoTossNoExec,
 284                                         *autoTossNoTrns,
 285                                         *autoTossNoArea,
 286                                 )
 287                         }
 288                         <-nodeIdC // call completion
 289                         if *autoToss {
 290                                 close(autoTossFinish)
 291                                 <-autoTossBadCode
 292                         }
 293                         conn.Close()
 294                 }(conn)
 295
 296         }
 297 }