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 # $DragonFly: src/share/examples/isdn/contrib/isdnctl,v 1.2 2003/06/17 04:36:57 dillon Exp $
  24 #
  25
  26
  27 usage () {
  28         echo "Usage: $0 [-i interface] [-f /path/to/users.file] [up|down|show]"
  29 }
  30
  31 # Defaults
  32 INTERFACE=isp0
  33 USERSFILE=
  34
  35 # Getopt stuff
  36 args=`getopt i:f: $*`
  37 if [ $? != 0 ]; then
  38                 usage
  39                 exit 2
  40         fi
  41 set -- $args
  42 for i; do
  43         case "$i" in
  44                 -i)
  45                         INTERFACE="$2"
  46                         shift; shift
  47                         ;;
  48                 -f)
  49                         USERSFILE="$2"
  50                         shift; shift
  51                         ;;
  52                 --)
  53                         shift
  54                         break
  55                         ;;
  56         esac
  57 done
  58
  59 if [ -z $USERSFILE ]; then
  60         USERSFILE=/var/run/isdn.users.$INTERFACE
  61 fi
  62
  63 if [ -z $1 ]; then
  64         usage
  65         exit 2
  66 fi
  67
  68 # Does Usersfile exist?
  69 if [ ! -f $USERSFILE ]; then
  70         # Try to create it
  71         if ! /sbin/ifconfig $INTERFACE | grep "^$INTERFACE.*<UP," > /dev/null; then
  72                 echo "0" > $USERSFILE || exit 1
  73         else
  74                 echo "1" > $USERSFILE || exit 1
  75         fi
  76 elif [ ! -w $USERSFILE ]; then
  77         echo "Error: $USERSFILE not writeable!"
  78         exit 1
  79 fi
  80
  81 if ! /sbin/ifconfig $INTERFACE | grep "^$INTERFACE.*<UP," > /dev/null; then
  82         if ! cat $USERSFILE | grep '^0$' > /dev/null ; then
  83                 echo "Interface down, removing number from file";
  84                 echo "0" > $USERSFILE
  85         fi;
  86 fi;
  87
  88 case "$1" in
  89                 show)
  90                         echo "`cat $USERSFILE` users online"
  91                         ;;
  92                 up)
  93                         expr `cat $USERSFILE` + 1 > $USERSFILE
  94                         /sbin/ifconfig $INTERFACE up
  95                         echo "`cat $USERSFILE` users online"
  96                         ;;
  97                 down)
  98                         if cat $USERSFILE | grep '^0$' > /dev/null ; then
  99                                 echo "Already down"
 100                                 exit 0
 101                         fi
 102                         expr `cat $USERSFILE` - 1 > $USERSFILE
 103                         if cat $USERSFILE | grep '^0$' > /dev/null ; then
 104                                 echo "`cat $USERSFILE` users online, interface down"
 105                                 /sbin/ifconfig $INTERFACE down
 106                                 exit 0
 107                         fi
 108                         echo "`cat $USERSFILE` users online"
 109                         ;;
 110 esac
 111
 112 exit 0