src/cmd/nncp-daemon/main.go

   1 /*
   2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
   3 Copyright (C) 2016-2021 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         "time"
  28
  29         "go.cypherpunks.ru/nncp/v5"
  30         "golang.org/x/net/netutil"
  31 )
  32
  33 func usage() {
  34         fmt.Fprintf(os.Stderr, nncp.UsageHeader())
  35         fmt.Fprintf(os.Stderr, "nncp-daemon -- TCP daemon\n\n")
  36         fmt.Fprintf(os.Stderr, "Usage: %s [options]\nOptions:\n", os.Args[0])
  37         flag.PrintDefaults()
  38 }
  39
  40 type InetdConn struct {
  41         r *os.File
  42         w *os.File
  43 }
  44
  45 func (c InetdConn) Read(p []byte) (n int, err error) {
  46         return c.r.Read(p)
  47 }
  48
  49 func (c InetdConn) Write(p []byte) (n int, err error) {
  50         return c.w.Write(p)
  51 }
  52
  53 func (c InetdConn) SetReadDeadline(t time.Time) error {
  54         return c.r.SetReadDeadline(t)
  55 }
  56
  57 func (c InetdConn) SetWriteDeadline(t time.Time) error {
  58         return c.w.SetWriteDeadline(t)
  59 }
  60
  61 func (c InetdConn) Close() error {
  62         if err := c.r.Close(); err != nil {
  63                 c.w.Close() // #nosec G104
  64                 return err
  65         }
  66         return c.w.Close()
  67 }
  68
  69 func performSP(
  70         ctx *nncp.Ctx,
  71         conn nncp.ConnDeadlined,
  72         nice uint8,
  73         nodeIdC chan *nncp.NodeId,
  74 ) {
  75         state := nncp.SPState{
  76                 Ctx:  ctx,
  77                 Nice: nice,
  78         }
  79         if err := state.StartR(conn); err == nil {
  80                 ctx.LogI("call-start", nncp.SDS{"node": state.Node.Id}, "connected")
  81                 nodeIdC <- state.Node.Id
  82                 state.Wait()
  83                 ctx.LogI("call-finish", nncp.SDS{
  84                         "node":     state.Node.Id,
  85                         "duration": int64(state.Duration.Seconds()),
  86                         "rxbytes":  state.RxBytes,
  87                         "txbytes":  state.TxBytes,
  88                         "rxspeed":  state.RxSpeed,
  89                         "txspeed":  state.TxSpeed,
  90                 }, "")
  91         } else {
  92                 nodeId := "unknown"
  93                 if state.Node == nil {
  94                         nodeIdC <- nil
  95                 } else {
  96                         nodeIdC <- state.Node.Id
  97                         nodeId = state.Node.Id.String()
  98                 }
  99                 ctx.LogE("call-start", nncp.SDS{"node": nodeId}, err, "")
 100         }
 101         close(nodeIdC)
 102 }
 103
 104 func main() {
 105         var (
 106                 cfgPath   = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
 107                 niceRaw   = flag.String("nice", nncp.NicenessFmt(255), "Minimal required niceness")
 108                 bind      = flag.String("bind", "[::]:5400", "Address to bind to")
 109                 inetd     = flag.Bool("inetd", false, "Is it started as inetd service")
 110                 maxConn   = flag.Int("maxconn", 128, "Maximal number of simultaneous connections")
 111                 spoolPath = flag.String("spool", "", "Override path to spool")
 112                 logPath   = flag.String("log", "", "Override path to logfile")
 113                 quiet     = flag.Bool("quiet", false, "Print only errors")
 114                 showPrgrs = flag.Bool("progress", false, "Force progress showing")
 115                 omitPrgrs = flag.Bool("noprogress", false, "Omit progress showing")
 116                 debug     = flag.Bool("debug", false, "Print debug messages")
 117                 version   = flag.Bool("version", false, "Print version information")
 118                 warranty  = flag.Bool("warranty", false, "Print warranty information")
 119
 120                 autoToss       = flag.Bool("autotoss", false, "Toss after call is finished")
 121                 autoTossDoSeen = flag.Bool("autotoss-seen", false, "Create .seen files during tossing")
 122                 autoTossNoFile = flag.Bool("autotoss-nofile", false, "Do not process \"file\" packets during tossing")
 123                 autoTossNoFreq = flag.Bool("autotoss-nofreq", false, "Do not process \"freq\" packets during tossing")
 124                 autoTossNoExec = flag.Bool("autotoss-noexec", false, "Do not process \"exec\" packets during tossing")
 125                 autoTossNoTrns = flag.Bool("autotoss-notrns", false, "Do not process \"trns\" packets during tossing")
 126         )
 127         flag.Usage = usage
 128         flag.Parse()
 129         if *warranty {
 130                 fmt.Println(nncp.Warranty)
 131                 return
 132         }
 133         if *version {
 134                 fmt.Println(nncp.VersionGet())
 135                 return
 136         }
 137         nice, err := nncp.NicenessParse(*niceRaw)
 138         if err != nil {
 139                 log.Fatalln(err)
 140         }
 141
 142         ctx, err := nncp.CtxFromCmdline(
 143                 *cfgPath,
 144                 *spoolPath,
 145                 *logPath,
 146                 *quiet,
 147                 *showPrgrs,
 148                 *omitPrgrs,
 149                 *debug,
 150         )
 151         if err != nil {
 152                 log.Fatalln("Error during initialization:", err)
 153         }
 154         if ctx.Self == nil {
 155                 log.Fatalln("Config lacks private keys")
 156         }
 157         ctx.Umask()
 158
 159         if *inetd {
 160                 os.Stderr.Close() // #nosec G104
 161                 conn := &InetdConn{os.Stdin, os.Stdout}
 162                 nodeIdC := make(chan *nncp.NodeId)
 163                 go performSP(ctx, conn, nice, nodeIdC)
 164                 nodeId := <-nodeIdC
 165                 var autoTossFinish chan struct{}
 166                 var autoTossBadCode chan bool
 167                 if *autoToss && nodeId != nil {
 168                         autoTossFinish, autoTossBadCode = ctx.AutoToss(
 169                                 nodeId,
 170                                 nice,
 171                                 *autoTossDoSeen,
 172                                 *autoTossNoFile,
 173                                 *autoTossNoFreq,
 174                                 *autoTossNoExec,
 175                                 *autoTossNoTrns,
 176                         )
 177                 }
 178                 <-nodeIdC // call completion
 179                 if *autoToss {
 180                         close(autoTossFinish)
 181                         <-autoTossBadCode
 182                 }
 183                 conn.Close() // #nosec G104
 184                 return
 185         }
 186
 187         ln, err := net.Listen("tcp", *bind)
 188         if err != nil {
 189                 log.Fatalln("Can not listen:", err)
 190         }
 191         ln = netutil.LimitListener(ln, *maxConn)
 192         for {
 193                 conn, err := ln.Accept()
 194                 if err != nil {
 195                         log.Fatalln("Can not accept connection:", err)
 196                 }
 197                 ctx.LogD("daemon", nncp.SDS{"addr": conn.RemoteAddr()}, "accepted")
 198                 go func(conn net.Conn) {
 199                         nodeIdC := make(chan *nncp.NodeId)
 200                         go performSP(ctx, conn, nice, nodeIdC)
 201                         nodeId := <-nodeIdC
 202                         var autoTossFinish chan struct{}
 203                         var autoTossBadCode chan bool
 204                         if *autoToss && nodeId != nil {
 205                                 autoTossFinish, autoTossBadCode = ctx.AutoToss(
 206                                         nodeId,
 207                                         nice,
 208                                         *autoTossDoSeen,
 209                                         *autoTossNoFile,
 210                                         *autoTossNoFreq,
 211                                         *autoTossNoExec,
 212                                         *autoTossNoTrns,
 213                                 )
 214                         }
 215                         <-nodeIdC // call completion
 216                         if *autoToss {
 217                                 close(autoTossFinish)
 218                                 <-autoTossBadCode
 219                         }
 220                         conn.Close() // #nosec G104
 221                 }(conn)
 222         }
 223 }