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         "github.com/dustin/go-humanize"
  30         "go.cypherpunks.ru/nncp/v6"
  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 (c InetdConn) Read(p []byte) (n int, err error) {
  47         return c.r.Read(p)
  48 }
  49
  50 func (c InetdConn) Write(p []byte) (n int, err error) {
  51         return c.w.Write(p)
  52 }
  53
  54 func (c InetdConn) SetReadDeadline(t time.Time) error {
  55         return c.r.SetReadDeadline(t)
  56 }
  57
  58 func (c InetdConn) SetWriteDeadline(t time.Time) error {
  59         return c.w.SetWriteDeadline(t)
  60 }
  61
  62 func (c InetdConn) Close() error {
  63         if err := c.r.Close(); err != nil {
  64                 c.w.Close() // #nosec G104
  65                 return err
  66         }
  67         return c.w.Close()
  68 }
  69
  70 func performSP(
  71         ctx *nncp.Ctx,
  72         conn nncp.ConnDeadlined,
  73         nice uint8,
  74         noCK bool,
  75         nodeIdC chan *nncp.NodeId,
  76 ) {
  77         state := nncp.SPState{
  78                 Ctx:  ctx,
  79                 Nice: nice,
  80                 NoCK: noCK,
  81         }
  82         if err := state.StartR(conn); err == nil {
  83                 ctx.LogI(
  84                         "call-started",
  85                         nncp.LEs{{K: "Node", V: state.Node.Id}},
  86                         func(les nncp.LEs) string { return "Connection with " + state.Node.Name },
  87                 )
  88                 nodeIdC <- state.Node.Id
  89                 state.Wait()
  90                 ctx.LogI("call-finished", nncp.LEs{
  91                         {K: "Node", V: state.Node.Id},
  92                         {K: "Duration", V: int64(state.Duration.Seconds())},
  93                         {K: "RxBytes", V: state.RxBytes},
  94                         {K: "TxBytes", V: state.TxBytes},
  95                         {K: "RxSpeed", V: state.RxSpeed},
  96                         {K: "TxSpeed", V: state.TxSpeed},
  97                 }, func(les nncp.LEs) string {
  98                         return fmt.Sprintf(
  99                                 "Finished call with %s (%d:%d:%d): %s received (%s/sec), %s transferred (%s/sec)",
 100                                 state.Node.Name,
 101                                 int(state.Duration.Hours()),
 102                                 int(state.Duration.Minutes()),
 103                                 int(state.Duration.Seconds()),
 104                                 humanize.IBytes(uint64(state.RxBytes)),
 105                                 humanize.IBytes(uint64(state.RxSpeed)),
 106                                 humanize.IBytes(uint64(state.TxBytes)),
 107                                 humanize.IBytes(uint64(state.TxSpeed)),
 108                         )
 109                 })
 110         } else {
 111                 nodeId := "unknown"
 112                 if state.Node == nil {
 113                         nodeIdC <- nil
 114                 } else {
 115                         nodeIdC <- state.Node.Id
 116                         nodeId = state.Node.Id.String()
 117                 }
 118                 ctx.LogI(
 119                         "call-started",
 120                         nncp.LEs{{K: "Node", V: nodeId}},
 121                         func(les nncp.LEs) string { return "Connected to " + state.Node.Name },
 122                 )
 123         }
 124         close(nodeIdC)
 125 }
 126
 127 func main() {
 128         var (
 129                 cfgPath   = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
 130                 niceRaw   = flag.String("nice", nncp.NicenessFmt(255), "Minimal required niceness")
 131                 bind      = flag.String("bind", "[::]:5400", "Address to bind to")
 132                 inetd     = flag.Bool("inetd", false, "Is it started as inetd service")
 133                 maxConn   = flag.Int("maxconn", 128, "Maximal number of simultaneous connections")
 134                 noCK      = flag.Bool("nock", false, "Do no checksum checking")
 135                 spoolPath = flag.String("spool", "", "Override path to spool")
 136                 logPath   = flag.String("log", "", "Override path to logfile")
 137                 quiet     = flag.Bool("quiet", false, "Print only errors")
 138                 showPrgrs = flag.Bool("progress", false, "Force progress showing")
 139                 omitPrgrs = flag.Bool("noprogress", false, "Omit progress showing")
 140                 debug     = flag.Bool("debug", false, "Print debug messages")
 141                 version   = flag.Bool("version", false, "Print version information")
 142                 warranty  = flag.Bool("warranty", false, "Print warranty information")
 143
 144                 autoToss       = flag.Bool("autotoss", false, "Toss after call is finished")
 145                 autoTossDoSeen = flag.Bool("autotoss-seen", false, "Create .seen files during tossing")
 146                 autoTossNoFile = flag.Bool("autotoss-nofile", false, "Do not process \"file\" packets during tossing")
 147                 autoTossNoFreq = flag.Bool("autotoss-nofreq", false, "Do not process \"freq\" packets during tossing")
 148                 autoTossNoExec = flag.Bool("autotoss-noexec", false, "Do not process \"exec\" packets during tossing")
 149                 autoTossNoTrns = flag.Bool("autotoss-notrns", false, "Do not process \"trns\" packets during tossing")
 150         )
 151         flag.Usage = usage
 152         flag.Parse()
 153         if *warranty {
 154                 fmt.Println(nncp.Warranty)
 155                 return
 156         }
 157         if *version {
 158                 fmt.Println(nncp.VersionGet())
 159                 return
 160         }
 161         nice, err := nncp.NicenessParse(*niceRaw)
 162         if err != nil {
 163                 log.Fatalln(err)
 164         }
 165
 166         ctx, err := nncp.CtxFromCmdline(
 167                 *cfgPath,
 168                 *spoolPath,
 169                 *logPath,
 170                 *quiet,
 171                 *showPrgrs,
 172                 *omitPrgrs,
 173                 *debug,
 174         )
 175         if err != nil {
 176                 log.Fatalln("Error during initialization:", err)
 177         }
 178         if ctx.Self == nil {
 179                 log.Fatalln("Config lacks private keys")
 180         }
 181         ctx.Umask()
 182
 183         if *inetd {
 184                 os.Stderr.Close() // #nosec G104
 185                 conn := &InetdConn{os.Stdin, os.Stdout}
 186                 nodeIdC := make(chan *nncp.NodeId)
 187                 go performSP(ctx, conn, nice, *noCK, nodeIdC)
 188                 nodeId := <-nodeIdC
 189                 var autoTossFinish chan struct{}
 190                 var autoTossBadCode chan bool
 191                 if *autoToss && nodeId != nil {
 192                         autoTossFinish, autoTossBadCode = ctx.AutoToss(
 193                                 nodeId,
 194                                 nice,
 195                                 *autoTossDoSeen,
 196                                 *autoTossNoFile,
 197                                 *autoTossNoFreq,
 198                                 *autoTossNoExec,
 199                                 *autoTossNoTrns,
 200                         )
 201                 }
 202                 <-nodeIdC // call completion
 203                 if *autoToss {
 204                         close(autoTossFinish)
 205                         <-autoTossBadCode
 206                 }
 207                 conn.Close() // #nosec G104
 208                 return
 209         }
 210
 211         ln, err := net.Listen("tcp", *bind)
 212         if err != nil {
 213                 log.Fatalln("Can not listen:", err)
 214         }
 215         ln = netutil.LimitListener(ln, *maxConn)
 216         for {
 217                 conn, err := ln.Accept()
 218                 if err != nil {
 219                         log.Fatalln("Can not accept connection:", err)
 220                 }
 221                 ctx.LogD(
 222                         "daemon-accepted",
 223                         nncp.LEs{{K: "Addr", V: conn.RemoteAddr()}},
 224                         func(les nncp.LEs) string {
 225                                 return "Accepted connection with " + conn.RemoteAddr().String()
 226                         },
 227                 )
 228                 go func(conn net.Conn) {
 229                         nodeIdC := make(chan *nncp.NodeId)
 230                         go performSP(ctx, conn, nice, *noCK, nodeIdC)
 231                         nodeId := <-nodeIdC
 232                         var autoTossFinish chan struct{}
 233                         var autoTossBadCode chan bool
 234                         if *autoToss && nodeId != nil {
 235                                 autoTossFinish, autoTossBadCode = ctx.AutoToss(
 236                                         nodeId,
 237                                         nice,
 238                                         *autoTossDoSeen,
 239                                         *autoTossNoFile,
 240                                         *autoTossNoFreq,
 241                                         *autoTossNoExec,
 242                                         *autoTossNoTrns,
 243                                 )
 244                         }
 245                         <-nodeIdC // call completion
 246                         if *autoToss {
 247                                 close(autoTossFinish)
 248                                 <-autoTossBadCode
 249                         }
 250                         conn.Close() // #nosec G104
 251                 }(conn)
 252         }
 253 }