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                 autoTossNoACK  = flag.Bool("autotoss-noack", false, "Do not process \"ack\" packets during tossing")
 162         )
 163         log.SetFlags(log.Lshortfile)
 164         flag.Usage = usage
 165         flag.Parse()
 166         if *warranty {
 167                 fmt.Println(nncp.Warranty)
 168                 return
 169         }
 170         if *version {
 171                 fmt.Println(nncp.VersionGet())
 172                 return
 173         }
 174         nice, err := nncp.NicenessParse(*niceRaw)
 175         if err != nil {
 176                 log.Fatalln(err)
 177         }
 178         if *inetd {
 179                 *ucspi = true
 180         }
 181
 182         ctx, err := nncp.CtxFromCmdline(
 183                 *cfgPath,
 184                 *spoolPath,
 185                 *logPath,
 186                 *quiet,
 187                 *showPrgrs,
 188                 *omitPrgrs,
 189                 *debug,
 190         )
 191         if err != nil {
 192                 log.Fatalln("Error during initialization:", err)
 193         }
 194         if ctx.Self == nil {
 195                 log.Fatalln("Config lacks private keys")
 196         }
 197         ctx.Umask()
 198
 199         if *ucspi {
 200                 os.Stderr.Close()
 201                 conn := &nncp.UCSPIConn{R: os.Stdin, W: os.Stdout}
 202                 nodeIdC := make(chan *nncp.NodeId)
 203                 addr := nncp.UCSPITCPRemoteAddr()
 204                 if addr == "" {
 205                         addr = "PIPE"
 206                 }
 207                 go performSP(ctx, conn, addr, nice, *noCK, nodeIdC)
 208                 nodeId := <-nodeIdC
 209                 var autoTossFinish chan struct{}
 210                 var autoTossBadCode chan bool
 211                 if *autoToss && nodeId != nil {
 212                         autoTossFinish, autoTossBadCode = ctx.AutoToss(
 213                                 nodeId,
 214                                 nice,
 215                                 *autoTossDoSeen,
 216                                 *autoTossNoFile,
 217                                 *autoTossNoFreq,
 218                                 *autoTossNoExec,
 219                                 *autoTossNoTrns,
 220                                 *autoTossNoArea,
 221                                 *autoTossNoACK,
 222                         )
 223                 }
 224                 <-nodeIdC // call completion
 225                 if *autoToss {
 226                         close(autoTossFinish)
 227                         <-autoTossBadCode
 228                 }
 229                 conn.Close()
 230                 return
 231         }
 232
 233         conns := make(chan net.Conn)
 234         if *bind != "" {
 235                 cols := strings.Split(*bind, ":")
 236                 port, err := strconv.Atoi(cols[len(cols)-1])
 237                 if err != nil {
 238                         log.Fatalln("Can not parse port:", err)
 239                 }
 240
 241                 if *mcdOnce {
 242                         if err = startMCDTx(ctx, port, true); err != nil {
 243                                 log.Fatalln("Can not do MCD transmission:", err)
 244                         }
 245                         return
 246                 }
 247
 248                 ln, err := net.Listen("tcp", *bind)
 249                 if err != nil {
 250                         log.Fatalln("Can not listen:", err)
 251                 }
 252                 if err = startMCDTx(ctx, port, false); err != nil {
 253                         log.Fatalln("Can not do MCD transmission:", err)
 254                 }
 255                 ln = netutil.LimitListener(ln, *maxConn)
 256                 go func() {
 257                         for {
 258                                 conn, err := ln.Accept()
 259                                 if err != nil {
 260                                         log.Fatalln("Can not accept connection on TCP:", err)
 261                                 }
 262                                 conns <- conn
 263                         }
 264                 }()
 265         }
 266
 267         if *yggdrasil != "" {
 268                 ln, err := nncpYggdrasil.NewListener(ctx.YggdrasilAliases, *yggdrasil)
 269                 if err != nil {
 270                         log.Fatalln("Can not listen:", err)
 271                 }
 272                 ln = netutil.LimitListener(ln, *maxConn)
 273                 go func() {
 274                         for {
 275                                 conn, err := ln.Accept()
 276                                 if err != nil {
 277                                         log.Fatalln("Can not accept connection on Yggdrasil:", err)
 278                                 }
 279                                 conns <- conn
 280                         }
 281                 }()
 282         }
 283
 284         for conn := range conns {
 285                 ctx.LogD(
 286                         "daemon-accepted",
 287                         nncp.LEs{{K: "Addr", V: conn.RemoteAddr()}},
 288                         func(les nncp.LEs) string {
 289                                 return "Accepted connection with " + conn.RemoteAddr().String()
 290                         },
 291                 )
 292                 go func(conn net.Conn) {
 293                         nodeIdC := make(chan *nncp.NodeId)
 294                         go performSP(ctx, conn, conn.RemoteAddr().String(), nice, *noCK, nodeIdC)
 295                         nodeId := <-nodeIdC
 296                         var autoTossFinish chan struct{}
 297                         var autoTossBadCode chan bool
 298                         if *autoToss && nodeId != nil {
 299                                 autoTossFinish, autoTossBadCode = ctx.AutoToss(
 300                                         nodeId,
 301                                         nice,
 302                                         *autoTossDoSeen,
 303                                         *autoTossNoFile,
 304                                         *autoTossNoFreq,
 305                                         *autoTossNoExec,
 306                                         *autoTossNoTrns,
 307                                         *autoTossNoArea,
 308                                         *autoTossNoACK,
 309                                 )
 310                         }
 311                         <-nodeIdC // call completion
 312                         if *autoToss {
 313                                 close(autoTossFinish)
 314                                 <-autoTossBadCode
 315                         }
 316                         conn.Close()
 317                 }(conn)
 318
 319         }
 320 }