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) 2016-2017 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, either version 3 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 // NNCP TCP daemon
  20 package main
  21
  22 import (
  23         "flag"
  24         "fmt"
  25         "io/ioutil"
  26         "log"
  27         "net"
  28         "os"
  29         "strconv"
  30
  31         "cypherpunks.ru/nncp"
  32         "golang.org/x/net/netutil"
  33 )
  34
  35 func usage() {
  36         fmt.Fprintf(os.Stderr, nncp.UsageHeader())
  37         fmt.Fprintln(os.Stderr, "nncp-daemon -- TCP daemon\n")
  38         fmt.Fprintf(os.Stderr, "Usage: %s [options]\nOptions:\n", os.Args[0])
  39         flag.PrintDefaults()
  40 }
  41
  42 func main() {
  43         var (
  44                 cfgPath  = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
  45                 niceRaw  = flag.Int("nice", 255, "Minimal required niceness")
  46                 bind     = flag.String("bind", "[::]:5400", "Address to bind to")
  47                 maxConn  = flag.Int("maxconn", 128, "Maximal number of simultaneous connections")
  48                 quiet    = flag.Bool("quiet", false, "Print only errors")
  49                 debug    = flag.Bool("debug", false, "Print debug messages")
  50                 version  = flag.Bool("version", false, "Print version information")
  51                 warranty = flag.Bool("warranty", false, "Print warranty information")
  52         )
  53         flag.Usage = usage
  54         flag.Parse()
  55         if *warranty {
  56                 fmt.Println(nncp.Warranty)
  57                 return
  58         }
  59         if *version {
  60                 fmt.Println(nncp.VersionGet())
  61                 return
  62         }
  63         if *niceRaw < 1 || *niceRaw > 255 {
  64                 log.Fatalln("-nice must be between 1 and 255")
  65         }
  66         nice := uint8(*niceRaw)
  67
  68         cfgRaw, err := ioutil.ReadFile(nncp.CfgPathFromEnv(cfgPath))
  69         if err != nil {
  70                 log.Fatalln("Can not read config:", err)
  71         }
  72         ctx, err := nncp.CfgParse(cfgRaw)
  73         if err != nil {
  74                 log.Fatalln("Can not parse config:", err)
  75         }
  76         if ctx.Self == nil {
  77                 log.Fatalln("Config lacks private keys")
  78         }
  79         ctx.Quiet = *quiet
  80         ctx.Debug = *debug
  81
  82         ln, err := net.Listen("tcp", *bind)
  83         if err != nil {
  84                 log.Fatalln("Can not listen:", err)
  85         }
  86         ln = netutil.LimitListener(ln, *maxConn)
  87         for {
  88                 conn, err := ln.Accept()
  89                 if err != nil {
  90                         log.Fatalln("Can not accept connection:", err)
  91                 }
  92                 ctx.LogD("daemon", nncp.SDS{"addr": conn.RemoteAddr()}, "accepted")
  93                 go func(conn net.Conn) {
  94                         state, err := ctx.StartR(conn, nice, "")
  95                         if err == nil {
  96                                 ctx.LogI("call-start", nncp.SDS{"node": state.Node.Id}, "connected")
  97                                 state.Wait()
  98                                 ctx.LogI("call-finish", nncp.SDS{
  99                                         "node":     state.Node.Id,
 100                                         "duration": strconv.FormatInt(int64(state.Duration.Seconds()), 10),
 101                                         "rxbytes":  strconv.FormatInt(state.RxBytes, 10),
 102                                         "txbytes":  strconv.FormatInt(state.TxBytes, 10),
 103                                         "rxspeed":  strconv.FormatInt(state.RxSpeed, 10),
 104                                         "txspeed":  strconv.FormatInt(state.TxSpeed, 10),
 105                                 }, "")
 106                         } else {
 107                                 nodeId := "unknown"
 108                                 if state != nil && state.Node != nil {
 109                                         nodeId = state.Node.Id.String()
 110                                 }
 111                                 ctx.LogE("call-start", nncp.SDS{"node": nodeId, "err": err}, "")
 112                         }
 113                         conn.Close()
 114                 }(conn)
 115         }
 116 }