src/cmd/nncp-exec/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 // Send execution command via NNCP.
  19 package main
  20
  21 import (
  22         "bufio"
  23         "flag"
  24         "fmt"
  25         "log"
  26         "os"
  27
  28         "go.cypherpunks.ru/nncp/v5"
  29 )
  30
  31 func usage() {
  32         fmt.Fprintf(os.Stderr, nncp.UsageHeader())
  33         fmt.Fprintf(os.Stderr, "nncp-exec -- send execution command\n\n")
  34         fmt.Fprintf(os.Stderr, "Usage: %s [options] NODE HANDLE [ARG0 ARG1 ...]\nOptions:\n", os.Args[0])
  35         flag.PrintDefaults()
  36 }
  37
  38 func main() {
  39         var (
  40                 cfgPath      = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
  41                 niceRaw      = flag.String("nice", nncp.NicenessFmt(nncp.DefaultNiceExec), "Outbound packet niceness")
  42                 replyNiceRaw = flag.String("replynice", nncp.NicenessFmt(nncp.DefaultNiceFile), "Possible reply packet niceness")
  43                 minSize      = flag.Uint64("minsize", 0, "Minimal required resulting packet size, in KiB")
  44                 viaOverride  = flag.String("via", "", "Override Via path to destination node")
  45                 spoolPath    = flag.String("spool", "", "Override path to spool")
  46                 logPath      = flag.String("log", "", "Override path to logfile")
  47                 quiet        = flag.Bool("quiet", false, "Print only errors")
  48                 debug        = flag.Bool("debug", false, "Print debug messages")
  49                 version      = flag.Bool("version", false, "Print version information")
  50                 warranty     = flag.Bool("warranty", false, "Print warranty information")
  51         )
  52         flag.Usage = usage
  53         flag.Parse()
  54         if *warranty {
  55                 fmt.Println(nncp.Warranty)
  56                 return
  57         }
  58         if *version {
  59                 fmt.Println(nncp.VersionGet())
  60                 return
  61         }
  62         if flag.NArg() < 2 {
  63                 usage()
  64                 os.Exit(1)
  65         }
  66         nice, err := nncp.NicenessParse(*niceRaw)
  67         if err != nil {
  68                 log.Fatalln(err)
  69         }
  70         replyNice, err := nncp.NicenessParse(*replyNiceRaw)
  71         if err != nil {
  72                 log.Fatalln(err)
  73         }
  74
  75         ctx, err := nncp.CtxFromCmdline(*cfgPath, *spoolPath, *logPath, *quiet, *debug)
  76         if err != nil {
  77                 log.Fatalln("Error during initialization:", err)
  78         }
  79         if ctx.Self == nil {
  80                 log.Fatalln("Config lacks private keys")
  81         }
  82
  83         node, err := ctx.FindNode(flag.Arg(0))
  84         if err != nil {
  85                 log.Fatalln("Invalid NODE specified:", err)
  86         }
  87
  88         nncp.ViaOverride(*viaOverride, ctx, node)
  89         ctx.Umask()
  90
  91         if err = ctx.TxExec(
  92                 node,
  93                 nice,
  94                 replyNice,
  95                 flag.Args()[1],
  96                 flag.Args()[2:],
  97                 bufio.NewReader(os.Stdin),
  98                 int64(*minSize)*1024,
  99         ); err != nil {
 100                 log.Fatalln(err)
 101         }
 102 }