src/cypherpunks.ru/nncp/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         "strconv"
  28         "time"
  29
  30         "cypherpunks.ru/nncp"
  31         "golang.org/x/net/netutil"
  32 )
  33
  34 func usage() {
  35         fmt.Fprintf(os.Stderr, nncp.UsageHeader())
  36         fmt.Fprintf(os.Stderr, "nncp-daemon -- TCP daemon\n\n")
  37         fmt.Fprintf(os.Stderr, "Usage: %s [options]\nOptions:\n", os.Args[0])
  38         flag.PrintDefaults()
  39 }
  40
  41 type InetdConn struct {
  42         r *os.File
  43         w *os.File
  44 }
  45
  46 func (ic *InetdConn) Read(p []byte) (n int, err error) {
  47         return ic.r.Read(p)
  48 }
  49
  50 func (ic *InetdConn) Write(p []byte) (n int, err error) {
  51         return ic.w.Write(p)
  52 }
  53
  54 func (ic *InetdConn) SetReadDeadline(t time.Time) error {
  55         return ic.r.SetReadDeadline(t)
  56 }
  57
  58 func (ic *InetdConn) SetWriteDeadline(t time.Time) error {
  59         return ic.w.SetWriteDeadline(t)
  60 }
  61
  62 func performSP(ctx *nncp.Ctx, conn nncp.ConnDeadlined, nice uint8) {
  63         state := nncp.SPState{
  64                 Ctx:  ctx,
  65                 Nice: nice,
  66         }
  67         if err := state.StartR(conn); err == nil {
  68                 ctx.LogI("call-start", nncp.SDS{"node": state.Node.Id}, "connected")
  69                 state.Wait()
  70                 ctx.LogI("call-finish", nncp.SDS{
  71                         "node":     state.Node.Id,
  72                         "duration": strconv.FormatInt(int64(state.Duration.Seconds()), 10),
  73                         "rxbytes":  strconv.FormatInt(state.RxBytes, 10),
  74                         "txbytes":  strconv.FormatInt(state.TxBytes, 10),
  75                         "rxspeed":  strconv.FormatInt(state.RxSpeed, 10),
  76                         "txspeed":  strconv.FormatInt(state.TxSpeed, 10),
  77                 }, "")
  78         } else {
  79                 nodeId := "unknown"
  80                 if state.Node != nil {
  81                         nodeId = state.Node.Id.String()
  82                 }
  83                 ctx.LogE("call-start", nncp.SDS{"node": nodeId, "err": err}, "")
  84         }
  85 }
  86
  87 func main() {
  88         var (
  89                 cfgPath   = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
  90                 niceRaw   = flag.String("nice", nncp.NicenessFmt(255), "Minimal required niceness")
  91                 bind      = flag.String("bind", "[::]:5400", "Address to bind to")
  92                 inetd     = flag.Bool("inetd", false, "Is it started as inetd service")
  93                 maxConn   = flag.Int("maxconn", 128, "Maximal number of simultaneous connections")
  94                 spoolPath = flag.String("spool", "", "Override path to spool")
  95                 logPath   = flag.String("log", "", "Override path to logfile")
  96                 quiet     = flag.Bool("quiet", false, "Print only errors")
  97                 debug     = flag.Bool("debug", false, "Print debug messages")
  98                 version   = flag.Bool("version", false, "Print version information")
  99                 warranty  = flag.Bool("warranty", false, "Print warranty information")
 100         )
 101         flag.Usage = usage
 102         flag.Parse()
 103         if *warranty {
 104                 fmt.Println(nncp.Warranty)
 105                 return
 106         }
 107         if *version {
 108                 fmt.Println(nncp.VersionGet())
 109                 return
 110         }
 111         nice, err := nncp.NicenessParse(*niceRaw)
 112         if err != nil {
 113                 log.Fatalln(err)
 114         }
 115
 116         ctx, err := nncp.CtxFromCmdline(*cfgPath, *spoolPath, *logPath, *quiet, *debug)
 117         if err != nil {
 118                 log.Fatalln("Error during initialization:", err)
 119         }
 120         if ctx.Self == nil {
 121                 log.Fatalln("Config lacks private keys")
 122         }
 123
 124         if *inetd {
 125                 os.Stderr.Close()
 126                 conn := &InetdConn{os.Stdin, os.Stdout}
 127                 performSP(ctx, conn, nice)
 128                 return
 129         }
 130
 131         ln, err := net.Listen("tcp", *bind)
 132         if err != nil {
 133                 log.Fatalln("Can not listen:", err)
 134         }
 135         ln = netutil.LimitListener(ln, *maxConn)
 136         for {
 137                 conn, err := ln.Accept()
 138                 if err != nil {
 139                         log.Fatalln("Can not accept connection:", err)
 140                 }
 141                 ctx.LogD("daemon", nncp.SDS{"addr": conn.RemoteAddr()}, "accepted")
 142                 go func(conn net.Conn) {
 143                         performSP(ctx, conn, nice)
 144                         conn.Close()
 145                 }(conn)
 146         }
 147 }