src/cmd/nncp-daemon/main.go

   1 /*
   2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
   3 Copyright (C) 2016-2019 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         return c.w.Close()
  63 }
  64
  65 func performSP(ctx *nncp.Ctx, conn nncp.ConnDeadlined, nice uint8) {
  66         state := nncp.SPState{
  67                 Ctx:  ctx,
  68                 Nice: nice,
  69         }
  70         if err := state.StartR(conn); err == nil {
  71                 ctx.LogI("call-start", nncp.SDS{"node": state.Node.Id}, "connected")
  72                 state.Wait()
  73                 ctx.LogI("call-finish", nncp.SDS{
  74                         "node":     state.Node.Id,
  75                         "duration": state.Duration.Seconds(),
  76                         "rxbytes":  state.RxBytes,
  77                         "txbytes":  state.TxBytes,
  78                         "rxspeed":  state.RxSpeed,
  79                         "txspeed":  state.TxSpeed,
  80                 }, "")
  81         } else {
  82                 nodeId := "unknown"
  83                 if state.Node != nil {
  84                         nodeId = state.Node.Id.String()
  85                 }
  86                 ctx.LogE("call-start", nncp.SDS{"node": nodeId}, err, "")
  87         }
  88 }
  89
  90 func main() {
  91         var (
  92                 cfgPath   = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
  93                 niceRaw   = flag.String("nice", nncp.NicenessFmt(255), "Minimal required niceness")
  94                 bind      = flag.String("bind", "[::]:5400", "Address to bind to")
  95                 inetd     = flag.Bool("inetd", false, "Is it started as inetd service")
  96                 maxConn   = flag.Int("maxconn", 128, "Maximal number of simultaneous connections")
  97                 spoolPath = flag.String("spool", "", "Override path to spool")
  98                 logPath   = flag.String("log", "", "Override path to logfile")
  99                 quiet     = flag.Bool("quiet", false, "Print only errors")
 100                 showPrgrs = flag.Bool("progress", false, "Force progress showing")
 101                 omitPrgrs = flag.Bool("noprogress", false, "Omit progress showing")
 102                 debug     = flag.Bool("debug", false, "Print debug messages")
 103                 version   = flag.Bool("version", false, "Print version information")
 104                 warranty  = flag.Bool("warranty", false, "Print warranty information")
 105         )
 106         flag.Usage = usage
 107         flag.Parse()
 108         if *warranty {
 109                 fmt.Println(nncp.Warranty)
 110                 return
 111         }
 112         if *version {
 113                 fmt.Println(nncp.VersionGet())
 114                 return
 115         }
 116         nice, err := nncp.NicenessParse(*niceRaw)
 117         if err != nil {
 118                 log.Fatalln(err)
 119         }
 120
 121         ctx, err := nncp.CtxFromCmdline(
 122                 *cfgPath,
 123                 *spoolPath,
 124                 *logPath,
 125                 *quiet,
 126                 *showPrgrs,
 127                 *omitPrgrs,
 128                 *debug,
 129         )
 130         if err != nil {
 131                 log.Fatalln("Error during initialization:", err)
 132         }
 133         if ctx.Self == nil {
 134                 log.Fatalln("Config lacks private keys")
 135         }
 136         ctx.Umask()
 137
 138         if *inetd {
 139                 os.Stderr.Close()
 140                 conn := &InetdConn{os.Stdin, os.Stdout}
 141                 performSP(ctx, conn, nice)
 142                 return
 143         }
 144
 145         ln, err := net.Listen("tcp", *bind)
 146         if err != nil {
 147                 log.Fatalln("Can not listen:", err)
 148         }
 149         ln = netutil.LimitListener(ln, *maxConn)
 150         for {
 151                 conn, err := ln.Accept()
 152                 if err != nil {
 153                         log.Fatalln("Can not accept connection:", err)
 154                 }
 155                 ctx.LogD("daemon", nncp.SDS{"addr": conn.RemoteAddr()}, "accepted")
 156                 go func(conn net.Conn) {
 157                         performSP(ctx, conn, nice)
 158                         conn.Close()
 159                 }(conn)
 160         }
 161 }