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(
  70         ctx *nncp.Ctx,
  71         conn nncp.ConnDeadlined,
  72         nice uint8,
  73         noCK bool,
  74         nodeIdC chan *nncp.NodeId,
  75 ) {
  76         state := nncp.SPState{
  77                 Ctx:  ctx,
  78                 Nice: nice,
  79                 NoCK: noCK,
  80         }
  81         if err := state.StartR(conn); err == nil {
  82                 ctx.LogI("call-start", nncp.LEs{{K: "Node", V: state.Node.Id}}, "connected")
  83                 nodeIdC <- state.Node.Id
  84                 state.Wait()
  85                 ctx.LogI("call-finish", nncp.LEs{
  86                         {K: "Node", V: state.Node.Id},
  87                         {K: "Duration", V: int64(state.Duration.Seconds())},
  88                         {K: "RxBytes", V: state.RxBytes},
  89                         {K: "TxBytes", V: state.TxBytes},
  90                         {K: "RxSpeed", V: state.RxSpeed},
  91                         {K: "TxSpeed", V: state.TxSpeed},
  92                 }, "")
  93         } else {
  94                 nodeId := "unknown"
  95                 if state.Node == nil {
  96                         nodeIdC <- nil
  97                 } else {
  98                         nodeIdC <- state.Node.Id
  99                         nodeId = state.Node.Id.String()
 100                 }
 101                 ctx.LogI("call-start", nncp.LEs{{K: "Node", V: nodeId}}, "connected")
 102         }
 103         close(nodeIdC)
 104 }
 105
 106 func main() {
 107         var (
 108                 cfgPath   = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
 109                 niceRaw   = flag.String("nice", nncp.NicenessFmt(255), "Minimal required niceness")
 110                 bind      = flag.String("bind", "[::]:5400", "Address to bind to")
 111                 inetd     = flag.Bool("inetd", false, "Is it started as inetd service")
 112                 maxConn   = flag.Int("maxconn", 128, "Maximal number of simultaneous connections")
 113                 noCK      = flag.Bool("nock", false, "Do no checksum checking")
 114                 spoolPath = flag.String("spool", "", "Override path to spool")
 115                 logPath   = flag.String("log", "", "Override path to logfile")
 116                 quiet     = flag.Bool("quiet", false, "Print only errors")
 117                 showPrgrs = flag.Bool("progress", false, "Force progress showing")
 118                 omitPrgrs = flag.Bool("noprogress", false, "Omit progress showing")
 119                 debug     = flag.Bool("debug", false, "Print debug messages")
 120                 version   = flag.Bool("version", false, "Print version information")
 121                 warranty  = flag.Bool("warranty", false, "Print warranty information")
 122
 123                 autoToss       = flag.Bool("autotoss", false, "Toss after call is finished")
 124                 autoTossDoSeen = flag.Bool("autotoss-seen", false, "Create .seen files during tossing")
 125                 autoTossNoFile = flag.Bool("autotoss-nofile", false, "Do not process \"file\" packets during tossing")
 126                 autoTossNoFreq = flag.Bool("autotoss-nofreq", false, "Do not process \"freq\" packets during tossing")
 127                 autoTossNoExec = flag.Bool("autotoss-noexec", false, "Do not process \"exec\" packets during tossing")
 128                 autoTossNoTrns = flag.Bool("autotoss-notrns", false, "Do not process \"trns\" packets during tossing")
 129         )
 130         flag.Usage = usage
 131         flag.Parse()
 132         if *warranty {
 133                 fmt.Println(nncp.Warranty)
 134                 return
 135         }
 136         if *version {
 137                 fmt.Println(nncp.VersionGet())
 138                 return
 139         }
 140         nice, err := nncp.NicenessParse(*niceRaw)
 141         if err != nil {
 142                 log.Fatalln(err)
 143         }
 144
 145         ctx, err := nncp.CtxFromCmdline(
 146                 *cfgPath,
 147                 *spoolPath,
 148                 *logPath,
 149                 *quiet,
 150                 *showPrgrs,
 151                 *omitPrgrs,
 152                 *debug,
 153         )
 154         if err != nil {
 155                 log.Fatalln("Error during initialization:", err)
 156         }
 157         if ctx.Self == nil {
 158                 log.Fatalln("Config lacks private keys")
 159         }
 160         ctx.Umask()
 161
 162         if *inetd {
 163                 os.Stderr.Close() // #nosec G104
 164                 conn := &InetdConn{os.Stdin, os.Stdout}
 165                 nodeIdC := make(chan *nncp.NodeId)
 166                 go performSP(ctx, conn, nice, *noCK, nodeIdC)
 167                 nodeId := <-nodeIdC
 168                 var autoTossFinish chan struct{}
 169                 var autoTossBadCode chan bool
 170                 if *autoToss && nodeId != nil {
 171                         autoTossFinish, autoTossBadCode = ctx.AutoToss(
 172                                 nodeId,
 173                                 nice,
 174                                 *autoTossDoSeen,
 175                                 *autoTossNoFile,
 176                                 *autoTossNoFreq,
 177                                 *autoTossNoExec,
 178                                 *autoTossNoTrns,
 179                         )
 180                 }
 181                 <-nodeIdC // call completion
 182                 if *autoToss {
 183                         close(autoTossFinish)
 184                         <-autoTossBadCode
 185                 }
 186                 conn.Close() // #nosec G104
 187                 return
 188         }
 189
 190         ln, err := net.Listen("tcp", *bind)
 191         if err != nil {
 192                 log.Fatalln("Can not listen:", err)
 193         }
 194         ln = netutil.LimitListener(ln, *maxConn)
 195         for {
 196                 conn, err := ln.Accept()
 197                 if err != nil {
 198                         log.Fatalln("Can not accept connection:", err)
 199                 }
 200                 ctx.LogD("daemon", nncp.LEs{{K: "Addr", V: conn.RemoteAddr()}}, "accepted")
 201                 go func(conn net.Conn) {
 202                         nodeIdC := make(chan *nncp.NodeId)
 203                         go performSP(ctx, conn, nice, *noCK, nodeIdC)
 204                         nodeId := <-nodeIdC
 205                         var autoTossFinish chan struct{}
 206                         var autoTossBadCode chan bool
 207                         if *autoToss && nodeId != nil {
 208                                 autoTossFinish, autoTossBadCode = ctx.AutoToss(
 209                                         nodeId,
 210                                         nice,
 211                                         *autoTossDoSeen,
 212                                         *autoTossNoFile,
 213                                         *autoTossNoFreq,
 214                                         *autoTossNoExec,
 215                                         *autoTossNoTrns,
 216                                 )
 217                         }
 218                         <-nodeIdC // call completion
 219                         if *autoToss {
 220                                 close(autoTossFinish)
 221                                 <-autoTossBadCode
 222                         }
 223                         conn.Close() // #nosec G104
 224                 }(conn)
 225         }
 226 }