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) {
  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 }
  93
  94 func main() {
  95         var (
  96                 cfgPath   = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
  97                 niceRaw   = flag.String("nice", nncp.NicenessFmt(255), "Minimal required niceness")
  98                 bind      = flag.String("bind", "[::]:5400", "Address to bind to")
  99                 inetd     = flag.Bool("inetd", false, "Is it started as inetd service")
 100                 maxConn   = flag.Int("maxconn", 128, "Maximal number of simultaneous connections")
 101                 spoolPath = flag.String("spool", "", "Override path to spool")
 102                 logPath   = flag.String("log", "", "Override path to logfile")
 103                 quiet     = flag.Bool("quiet", false, "Print only errors")
 104                 showPrgrs = flag.Bool("progress", false, "Force progress showing")
 105                 omitPrgrs = flag.Bool("noprogress", false, "Omit progress showing")
 106                 debug     = flag.Bool("debug", false, "Print debug messages")
 107                 version   = flag.Bool("version", false, "Print version information")
 108                 warranty  = flag.Bool("warranty", false, "Print warranty information")
 109         )
 110         flag.Usage = usage
 111         flag.Parse()
 112         if *warranty {
 113                 fmt.Println(nncp.Warranty)
 114                 return
 115         }
 116         if *version {
 117                 fmt.Println(nncp.VersionGet())
 118                 return
 119         }
 120         nice, err := nncp.NicenessParse(*niceRaw)
 121         if err != nil {
 122                 log.Fatalln(err)
 123         }
 124
 125         ctx, err := nncp.CtxFromCmdline(
 126                 *cfgPath,
 127                 *spoolPath,
 128                 *logPath,
 129                 *quiet,
 130                 *showPrgrs,
 131                 *omitPrgrs,
 132                 *debug,
 133         )
 134         if err != nil {
 135                 log.Fatalln("Error during initialization:", err)
 136         }
 137         if ctx.Self == nil {
 138                 log.Fatalln("Config lacks private keys")
 139         }
 140         ctx.Umask()
 141
 142         if *inetd {
 143                 os.Stderr.Close() // #nosec G104
 144                 conn := &InetdConn{os.Stdin, os.Stdout}
 145                 performSP(ctx, conn, nice)
 146                 conn.Close() // #nosec G104
 147                 return
 148         }
 149
 150         ln, err := net.Listen("tcp", *bind)
 151         if err != nil {
 152                 log.Fatalln("Can not listen:", err)
 153         }
 154         ln = netutil.LimitListener(ln, *maxConn)
 155         for {
 156                 conn, err := ln.Accept()
 157                 if err != nil {
 158                         log.Fatalln("Can not accept connection:", err)
 159                 }
 160                 ctx.LogD("daemon", nncp.SDS{"addr": conn.RemoteAddr()}, "accepted")
 161                 go func(conn net.Conn) {
 162                         performSP(ctx, conn, nice)
 163                         conn.Close() // #nosec G104
 164                 }(conn)
 165         }
 166 }