share/examples/isdn/contrib/isdnctl

   1 #!/bin/sh
   2
   3 # isdnctl
   4 # Control the ISDN line based on usage
   5 #
   6 # This script can control the state of your ISDN line.  It counts
   7 # how many scripts/users currently use the ISDN line and uses
   8 # "ifconfig down" if noone uses it any more.
   9 # I use this script for cronjobs that fetch mail and news and run cvsup.
  10 # If I'm still using the line, the script won't close the connection,
  11 # but if not, it saves a lot of phone costs.
  12 #
  13 # ----------------------------------------------------------------------------
  14 # "THE BEER-WARE LICENSE" (Revision 42, (c) Poul-Henning Kamp):
  15 # Alexander Langer <alex@big.endian.de> wrote this file.  As long as you retain
  16 # this notice you can do whatever you want with this stuff. If we meet some
  17 # day, and you think this stuff is worth it, you can buy me a beer in return.
  18 #
  19 # Alexander Langer
  20 # ----------------------------------------------------------------------------
  21 #
  22 # $FreeBSD: src/share/examples/isdn/contrib/isdnctl,v 1.1.2.1 2001/08/10 14:59:48 obrien Exp $
  23 #
  24
  25
  26 usage () {
  27         echo "Usage: $0 [-i interface] [-f /path/to/users.file] [up|down|show]"
  28 }
  29
  30 # Defaults
  31 INTERFACE=isp0
  32 USERSFILE=
  33
  34 # Getopt stuff
  35 args=`getopt i:f: $*`
  36 if [ $? != 0 ]; then
  37                 usage
  38                 exit 2
  39         fi
  40 set -- $args
  41 for i; do
  42         case "$i" in
  43                 -i)
  44                         INTERFACE="$2"
  45                         shift; shift
  46                         ;;
  47                 -f)
  48                         USERSFILE="$2"
  49                         shift; shift
  50                         ;;
  51                 --)
  52                         shift
  53                         break
  54                         ;;
  55         esac
  56 done
  57
  58 if [ -z $USERSFILE ]; then
  59         USERSFILE=/var/run/isdn.users.$INTERFACE
  60 fi
  61
  62 if [ -z $1 ]; then
  63         usage
  64         exit 2
  65 fi
  66
  67 # Does Usersfile exist?
  68 if [ ! -f $USERSFILE ]; then
  69         # Try to create it
  70         if ! /sbin/ifconfig $INTERFACE | grep "^$INTERFACE.*<UP," > /dev/null; then
  71                 echo "0" > $USERSFILE || exit 1
  72         else
  73                 echo "1" > $USERSFILE || exit 1
  74         fi
  75 elif [ ! -w $USERSFILE ]; then
  76         echo "Error: $USERSFILE not writeable!"
  77         exit 1
  78 fi
  79
  80 if ! /sbin/ifconfig $INTERFACE | grep "^$INTERFACE.*<UP," > /dev/null; then
  81         if ! cat $USERSFILE | grep '^0$' > /dev/null ; then
  82                 echo "Interface down, removing number from file";
  83                 echo "0" > $USERSFILE
  84         fi;
  85 fi;
  86
  87 case "$1" in
  88                 show)
  89                         echo "`cat $USERSFILE` users online"
  90                         ;;
  91                 up)
  92                         expr `cat $USERSFILE` + 1 > $USERSFILE
  93                         /sbin/ifconfig $INTERFACE up
  94                         echo "`cat $USERSFILE` users online"
  95                         ;;
  96                 down)
  97                         if cat $USERSFILE | grep '^0$' > /dev/null ; then
  98                                 echo "Already down"
  99                                 exit 0
 100                         fi
 101                         expr `cat $USERSFILE` - 1 > $USERSFILE
 102                         if cat $USERSFILE | grep '^0$' > /dev/null ; then
 103                                 echo "`cat $USERSFILE` users online, interface down"
 104                                 /sbin/ifconfig $INTERFACE down
 105                                 exit 0
 106                         fi
 107                         echo "`cat $USERSFILE` users online"
 108                         ;;
 109 esac
 110
 111 exit 0