src/cmd/nncp-exec/main.go

   1 /*
   2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
   3 Copyright (C) 2016-2022 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         "strings"
  28
  29         "go.cypherpunks.ru/nncp/v8"
  30 )
  31
  32 func usage() {
  33         fmt.Fprintf(os.Stderr, nncp.UsageHeader())
  34         fmt.Fprintf(os.Stderr, "nncp-exec -- send execution command\n\n")
  35         fmt.Fprintf(os.Stderr, "Usage: %s [options] NODE HANDLE [ARG0 ARG1 ...]\n", os.Args[0])
  36         fmt.Fprintf(os.Stderr, "       %s [options] %s:AREA HANDLE [ARG0 ARG1 ...]\nOptions:\n",
  37                 os.Args[0], nncp.AreaDir)
  38         flag.PrintDefaults()
  39 }
  40
  41 func main() {
  42         var (
  43                 noCompress   = flag.Bool("nocompress", false, "Do not compress input data")
  44                 cfgPath      = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
  45                 niceRaw      = flag.String("nice", nncp.NicenessFmt(nncp.DefaultNiceExec), "Outbound packet niceness")
  46                 replyNiceRaw = flag.String("replynice", nncp.NicenessFmt(nncp.DefaultNiceFile), "Possible reply packet niceness")
  47                 minSize      = flag.Uint64("minsize", 0, "Minimal required resulting packet size, in KiB")
  48                 argMaxSize   = flag.Uint64("maxsize", 0, "Maximal allowable resulting packet size, in KiB")
  49                 viaOverride  = flag.String("via", "", "Override Via path to destination node")
  50                 spoolPath    = flag.String("spool", "", "Override path to spool")
  51                 logPath      = flag.String("log", "", "Override path to logfile")
  52                 quiet        = flag.Bool("quiet", false, "Print only errors")
  53                 showPrgrs    = flag.Bool("progress", false, "Force progress showing")
  54                 omitPrgrs    = flag.Bool("noprogress", false, "Omit progress showing")
  55                 debug        = flag.Bool("debug", false, "Print debug messages")
  56                 version      = flag.Bool("version", false, "Print version information")
  57                 warranty     = flag.Bool("warranty", false, "Print warranty information")
  58         )
  59         log.SetFlags(log.Lshortfile)
  60         flag.Usage = usage
  61         flag.Parse()
  62         if *warranty {
  63                 fmt.Println(nncp.Warranty)
  64                 return
  65         }
  66         if *version {
  67                 fmt.Println(nncp.VersionGet())
  68                 return
  69         }
  70         if flag.NArg() < 2 {
  71                 usage()
  72                 os.Exit(1)
  73         }
  74         nice, err := nncp.NicenessParse(*niceRaw)
  75         if err != nil {
  76                 log.Fatalln(err)
  77         }
  78         replyNice, err := nncp.NicenessParse(*replyNiceRaw)
  79         if err != nil {
  80                 log.Fatalln(err)
  81         }
  82
  83         ctx, err := nncp.CtxFromCmdline(
  84                 *cfgPath,
  85                 *spoolPath,
  86                 *logPath,
  87                 *quiet,
  88                 *showPrgrs,
  89                 *omitPrgrs,
  90                 *debug,
  91         )
  92         if err != nil {
  93                 log.Fatalln("Error during initialization:", err)
  94         }
  95         if ctx.Self == nil {
  96                 log.Fatalln("Config lacks private keys")
  97         }
  98
  99         var areaId *nncp.AreaId
 100         var node *nncp.Node
 101         if strings.HasPrefix(flag.Arg(0), nncp.AreaDir+":") {
 102                 areaId = ctx.AreaName2Id[flag.Arg(0)[len(nncp.AreaDir)+1:]]
 103                 if areaId == nil {
 104                         log.Fatalln("Unknown area specified")
 105                 }
 106                 node = ctx.Neigh[*ctx.SelfId]
 107         } else {
 108                 node, err = ctx.FindNode(flag.Arg(0))
 109                 if err != nil {
 110                         log.Fatalln("Invalid NODE specified:", err)
 111                 }
 112         }
 113
 114         maxSize := int64(nncp.MaxFileSize)
 115         if *argMaxSize > 0 {
 116                 maxSize = int64(*argMaxSize) * 1024
 117         }
 118
 119         nncp.ViaOverride(*viaOverride, ctx, node)
 120         ctx.Umask()
 121
 122         if err = ctx.TxExec(
 123                 node,
 124                 nice,
 125                 replyNice,
 126                 flag.Args()[1],
 127                 flag.Args()[2:],
 128                 bufio.NewReader(os.Stdin),
 129                 int64(*minSize)*1024,
 130                 maxSize,
 131                 *noCompress,
 132                 areaId,
 133         ); err != nil {
 134                 log.Fatalln(err)
 135         }
 136 }