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(ctx *nncp.Ctx, conn nncp.ConnDeadlined, nice uint8) *nncp.SPState {
  70         state := nncp.SPState{
  71                 Ctx:  ctx,
  72                 Nice: nice,
  73         }
  74         if err := state.StartR(conn); err == nil {
  75                 ctx.LogI("call-start", nncp.SDS{"node": state.Node.Id}, "connected")
  76                 state.Wait()
  77                 ctx.LogI("call-finish", nncp.SDS{
  78                         "node":     state.Node.Id,
  79                         "duration": int64(state.Duration.Seconds()),
  80                         "rxbytes":  state.RxBytes,
  81                         "txbytes":  state.TxBytes,
  82                         "rxspeed":  state.RxSpeed,
  83                         "txspeed":  state.TxSpeed,
  84                 }, "")
  85         } else {
  86                 nodeId := "unknown"
  87                 if state.Node != nil {
  88                         nodeId = state.Node.Id.String()
  89                 }
  90                 ctx.LogE("call-start", nncp.SDS{"node": nodeId}, err, "")
  91         }
  92         return &state
  93 }
  94
  95 func main() {
  96         var (
  97                 cfgPath   = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
  98                 niceRaw   = flag.String("nice", nncp.NicenessFmt(255), "Minimal required niceness")
  99                 bind      = flag.String("bind", "[::]:5400", "Address to bind to")
 100                 inetd     = flag.Bool("inetd", false, "Is it started as inetd service")
 101                 maxConn   = flag.Int("maxconn", 128, "Maximal number of simultaneous connections")
 102                 spoolPath = flag.String("spool", "", "Override path to spool")
 103                 logPath   = flag.String("log", "", "Override path to logfile")
 104                 quiet     = flag.Bool("quiet", false, "Print only errors")
 105                 showPrgrs = flag.Bool("progress", false, "Force progress showing")
 106                 omitPrgrs = flag.Bool("noprogress", false, "Omit progress showing")
 107                 debug     = flag.Bool("debug", false, "Print debug messages")
 108                 version   = flag.Bool("version", false, "Print version information")
 109                 warranty  = flag.Bool("warranty", false, "Print warranty information")
 110
 111                 autotoss       = flag.Bool("autotoss", false, "Toss after call is finished")
 112                 autotossDoSeen = flag.Bool("autotoss-seen", false, "Create .seen files during tossing")
 113                 autotossNoFile = flag.Bool("autotoss-nofile", false, "Do not process \"file\" packets during tossing")
 114                 autotossNoFreq = flag.Bool("autotoss-nofreq", false, "Do not process \"freq\" packets during tossing")
 115                 autotossNoExec = flag.Bool("autotoss-noexec", false, "Do not process \"exec\" packets during tossing")
 116                 autotossNoTrns = flag.Bool("autotoss-notrns", false, "Do not process \"trns\" packets during tossing")
 117         )
 118         flag.Usage = usage
 119         flag.Parse()
 120         if *warranty {
 121                 fmt.Println(nncp.Warranty)
 122                 return
 123         }
 124         if *version {
 125                 fmt.Println(nncp.VersionGet())
 126                 return
 127         }
 128         nice, err := nncp.NicenessParse(*niceRaw)
 129         if err != nil {
 130                 log.Fatalln(err)
 131         }
 132
 133         ctx, err := nncp.CtxFromCmdline(
 134                 *cfgPath,
 135                 *spoolPath,
 136                 *logPath,
 137                 *quiet,
 138                 *showPrgrs,
 139                 *omitPrgrs,
 140                 *debug,
 141         )
 142         if err != nil {
 143                 log.Fatalln("Error during initialization:", err)
 144         }
 145         if ctx.Self == nil {
 146                 log.Fatalln("Config lacks private keys")
 147         }
 148         ctx.Umask()
 149
 150         if *inetd {
 151                 os.Stderr.Close() // #nosec G104
 152                 conn := &InetdConn{os.Stdin, os.Stdout}
 153                 performSP(ctx, conn, nice)
 154                 conn.Close() // #nosec G104
 155                 return
 156         }
 157
 158         ln, err := net.Listen("tcp", *bind)
 159         if err != nil {
 160                 log.Fatalln("Can not listen:", err)
 161         }
 162         ln = netutil.LimitListener(ln, *maxConn)
 163         for {
 164                 conn, err := ln.Accept()
 165                 if err != nil {
 166                         log.Fatalln("Can not accept connection:", err)
 167                 }
 168                 ctx.LogD("daemon", nncp.SDS{"addr": conn.RemoteAddr()}, "accepted")
 169                 go func(conn net.Conn) {
 170                         state := performSP(ctx, conn, nice)
 171                         conn.Close() // #nosec G104
 172                         if *autotoss && state.Node != nil {
 173                                 ctx.Toss(
 174                                         state.Node.Id,
 175                                         nice,
 176                                         false,
 177                                         *autotossDoSeen,
 178                                         *autotossNoFile,
 179                                         *autotossNoFreq,
 180                                         *autotossNoExec,
 181                                         *autotossNoTrns,
 182                                 )
 183                         }
 184                 }(conn)
 185         }
 186 }