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         "strconv"
  28         "strings"
  29         "time"
  30
  31         "github.com/dustin/go-humanize"
  32         "go.cypherpunks.ru/nncp/v8"
  33         "golang.org/x/net/netutil"
  34 )
  35
  36 func usage() {
  37         fmt.Fprintf(os.Stderr, nncp.UsageHeader())
  38         fmt.Fprintf(os.Stderr, "nncp-daemon -- TCP daemon\n\n")
  39         fmt.Fprintf(os.Stderr, "Usage: %s [options]\nOptions:\n", os.Args[0])
  40         flag.PrintDefaults()
  41 }
  42
  43 func performSP(
  44         ctx *nncp.Ctx,
  45         conn nncp.ConnDeadlined,
  46         addr string,
  47         nice uint8,
  48         noCK bool,
  49         nodeIdC chan *nncp.NodeId,
  50 ) {
  51         state := nncp.SPState{
  52                 Ctx:  ctx,
  53                 Nice: nice,
  54                 NoCK: noCK,
  55         }
  56         if err := state.StartR(conn); err == nil {
  57                 ctx.LogI(
  58                         "call-started",
  59                         nncp.LEs{{K: "Node", V: state.Node.Id}},
  60                         func(les nncp.LEs) string {
  61                                 return fmt.Sprintf("Connection with %s (%s)", state.Node.Name, addr)
  62                         },
  63                 )
  64                 nodeIdC <- state.Node.Id
  65                 state.Wait()
  66                 ctx.LogI("call-finished", nncp.LEs{
  67                         {K: "Node", V: state.Node.Id},
  68                         {K: "Duration", V: int64(state.Duration.Seconds())},
  69                         {K: "RxBytes", V: state.RxBytes},
  70                         {K: "TxBytes", V: state.TxBytes},
  71                         {K: "RxSpeed", V: state.RxSpeed},
  72                         {K: "TxSpeed", V: state.TxSpeed},
  73                 }, func(les nncp.LEs) string {
  74                         return fmt.Sprintf(
  75                                 "Finished call with %s (%d:%d:%d): %s received (%s/sec), %s transferred (%s/sec)",
  76                                 state.Node.Name,
  77                                 int(state.Duration.Hours()),
  78                                 int(state.Duration.Minutes()),
  79                                 int(state.Duration.Seconds())%60,
  80                                 humanize.IBytes(uint64(state.RxBytes)),
  81                                 humanize.IBytes(uint64(state.RxSpeed)),
  82                                 humanize.IBytes(uint64(state.TxBytes)),
  83                                 humanize.IBytes(uint64(state.TxSpeed)),
  84                         )
  85                 })
  86         } else {
  87                 var nodeId string
  88                 var nodeName string
  89                 if state.Node == nil {
  90                         nodeId = "unknown"
  91                         nodeName = "unknown"
  92                         nodeIdC <- nil
  93                 } else {
  94                         nodeId = state.Node.Id.String()
  95                         nodeName = state.Node.Name
  96                         nodeIdC <- state.Node.Id
  97                 }
  98                 ctx.LogI(
  99                         "call-started",
 100                         nncp.LEs{{K: "Node", V: nodeId}},
 101                         func(les nncp.LEs) string { return "Connected to " + nodeName },
 102                 )
 103         }
 104         close(nodeIdC)
 105 }
 106
 107 func main() {
 108         var (
 109                 cfgPath   = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
 110                 niceRaw   = flag.String("nice", nncp.NicenessFmt(255), "Minimal required niceness")
 111                 bind      = flag.String("bind", "[::]:5400", "Address to bind to")
 112                 ucspi     = flag.Bool("ucspi", false, "Is it started as UCSPI-TCP server")
 113                 inetd     = flag.Bool("inetd", false, "Obsolete, use -ucspi")
 114                 maxConn   = flag.Int("maxconn", 128, "Maximal number of simultaneous connections")
 115                 noCK      = flag.Bool("nock", false, "Do no checksum checking")
 116                 mcdOnce   = flag.Bool("mcd-once", false, "Send MCDs once and quit")
 117                 spoolPath = flag.String("spool", "", "Override path to spool")
 118                 logPath   = flag.String("log", "", "Override path to logfile")
 119                 quiet     = flag.Bool("quiet", false, "Print only errors")
 120                 showPrgrs = flag.Bool("progress", false, "Force progress showing")
 121                 omitPrgrs = flag.Bool("noprogress", false, "Omit progress showing")
 122                 debug     = flag.Bool("debug", false, "Print debug messages")
 123                 version   = flag.Bool("version", false, "Print version information")
 124                 warranty  = flag.Bool("warranty", false, "Print warranty information")
 125
 126                 autoToss       = flag.Bool("autotoss", false, "Toss after call is finished")
 127                 autoTossDoSeen = flag.Bool("autotoss-seen", false, "Create seen/ files during tossing")
 128                 autoTossNoFile = flag.Bool("autotoss-nofile", false, "Do not process \"file\" packets during tossing")
 129                 autoTossNoFreq = flag.Bool("autotoss-nofreq", false, "Do not process \"freq\" packets during tossing")
 130                 autoTossNoExec = flag.Bool("autotoss-noexec", false, "Do not process \"exec\" packets during tossing")
 131                 autoTossNoTrns = flag.Bool("autotoss-notrns", false, "Do not process \"trns\" packets during tossing")
 132                 autoTossNoArea = flag.Bool("autotoss-noarea", false, "Do not process \"area\" packets during tossing")
 133         )
 134         log.SetFlags(log.Lshortfile)
 135         flag.Usage = usage
 136         flag.Parse()
 137         if *warranty {
 138                 fmt.Println(nncp.Warranty)
 139                 return
 140         }
 141         if *version {
 142                 fmt.Println(nncp.VersionGet())
 143                 return
 144         }
 145         nice, err := nncp.NicenessParse(*niceRaw)
 146         if err != nil {
 147                 log.Fatalln(err)
 148         }
 149         if *inetd {
 150                 *ucspi = true
 151         }
 152
 153         ctx, err := nncp.CtxFromCmdline(
 154                 *cfgPath,
 155                 *spoolPath,
 156                 *logPath,
 157                 *quiet,
 158                 *showPrgrs,
 159                 *omitPrgrs,
 160                 *debug,
 161         )
 162         if err != nil {
 163                 log.Fatalln("Error during initialization:", err)
 164         }
 165         if ctx.Self == nil {
 166                 log.Fatalln("Config lacks private keys")
 167         }
 168         ctx.Umask()
 169
 170         if *ucspi {
 171                 os.Stderr.Close()
 172                 conn := &nncp.UCSPIConn{R: os.Stdin, W: os.Stdout}
 173                 nodeIdC := make(chan *nncp.NodeId)
 174                 addr := nncp.UCSPITCPRemoteAddr()
 175                 if addr == "" {
 176                         addr = "PIPE"
 177                 }
 178                 go performSP(ctx, conn, addr, nice, *noCK, nodeIdC)
 179                 nodeId := <-nodeIdC
 180                 var autoTossFinish chan struct{}
 181                 var autoTossBadCode chan bool
 182                 if *autoToss && nodeId != nil {
 183                         autoTossFinish, autoTossBadCode = ctx.AutoToss(
 184                                 nodeId,
 185                                 nice,
 186                                 *autoTossDoSeen,
 187                                 *autoTossNoFile,
 188                                 *autoTossNoFreq,
 189                                 *autoTossNoExec,
 190                                 *autoTossNoTrns,
 191                                 *autoTossNoArea,
 192                         )
 193                 }
 194                 <-nodeIdC // call completion
 195                 if *autoToss {
 196                         close(autoTossFinish)
 197                         <-autoTossBadCode
 198                 }
 199                 conn.Close()
 200                 return
 201         }
 202
 203         cols := strings.Split(*bind, ":")
 204         port, err := strconv.Atoi(cols[len(cols)-1])
 205         if err != nil {
 206                 log.Fatalln("Can not parse port:", err)
 207         }
 208
 209         if *mcdOnce {
 210                 for ifiName := range ctx.MCDTxIfis {
 211                         if err = ctx.MCDTx(ifiName, port, 0); err != nil {
 212                                 log.Fatalln("Can not do MCD transmission:", err)
 213                         }
 214                 }
 215                 return
 216         }
 217
 218         ln, err := net.Listen("tcp", *bind)
 219         if err != nil {
 220                 log.Fatalln("Can not listen:", err)
 221         }
 222
 223         for ifiName, secs := range ctx.MCDTxIfis {
 224                 if err = ctx.MCDTx(ifiName, port, time.Duration(secs)*time.Second); err != nil {
 225                         log.Fatalln("Can not run MCD transmission:", err)
 226                 }
 227         }
 228
 229         ln = netutil.LimitListener(ln, *maxConn)
 230         for {
 231                 conn, err := ln.Accept()
 232                 if err != nil {
 233                         log.Fatalln("Can not accept connection:", err)
 234                 }
 235                 ctx.LogD(
 236                         "daemon-accepted",
 237                         nncp.LEs{{K: "Addr", V: conn.RemoteAddr()}},
 238                         func(les nncp.LEs) string {
 239                                 return "Accepted connection with " + conn.RemoteAddr().String()
 240                         },
 241                 )
 242                 go func(conn net.Conn) {
 243                         nodeIdC := make(chan *nncp.NodeId)
 244                         go performSP(ctx, conn, conn.RemoteAddr().String(), nice, *noCK, nodeIdC)
 245                         nodeId := <-nodeIdC
 246                         var autoTossFinish chan struct{}
 247                         var autoTossBadCode chan bool
 248                         if *autoToss && nodeId != nil {
 249                                 autoTossFinish, autoTossBadCode = ctx.AutoToss(
 250                                         nodeId,
 251                                         nice,
 252                                         *autoTossDoSeen,
 253                                         *autoTossNoFile,
 254                                         *autoTossNoFreq,
 255                                         *autoTossNoExec,
 256                                         *autoTossNoTrns,
 257                                         *autoTossNoArea,
 258                                 )
 259                         }
 260                         <-nodeIdC // call completion
 261                         if *autoToss {
 262                                 close(autoTossFinish)
 263                                 <-autoTossBadCode
 264                         }
 265                         conn.Close()
 266                 }(conn)
 267         }
 268 }