sbin/grml-sniff

   1 #!/bin/sh
   2 # Filename:      grml-sniff
   3 # Purpose:       script for configuring a network sniffing setup
   4 # Authors:       grml-team (grml.org), (c) Michael Prokop <mika@grml.org>
   5 # Bug-Reports:   see http://grml.org/bugs/
   6 # License:       This file is licensed under the GPL v2.
   7 ################################################################################
   8
   9 CONFIG_FILE=/etc/grml/routersetup
  10 . /etc/grml/lsb-functions
  11 . /etc/grml/script-functions
  12
  13 usage_info()
  14 {
  15    einfo "$0 - script for configuring a network sniffing setup"
  16    einfo "Configure via $CONFIG_FILE - see man 8 grml-sniff" ; eend 0
  17 }
  18
  19 if ! [ -r "$CONFIG_FILE" ] ; then
  20   eerror "$CONFIG_FILE could not be read."
  21   exit 1
  22 fi
  23
  24 . "$CONFIG_FILE"
  25
  26 if [ -z "$BRIDGE_DEVICES" ] ; then
  27    eerror "Bridge devices (\$BRIDGE_DEVICES) not set in $CONFIG_FILE"
  28    exit 1
  29 fi
  30
  31 [ -n "$BRCTL" ]          || BRCTL='brctl'
  32 [ -n "$BRIDGE_NAME" ]    || BRIDGE_NAME='br0'
  33 [ -n "$BRIDGE_DEVICES" ] || BRIDGE_DEVICES='eth0 eth1'
  34
  35 check4progs $BRCTL || exit 1
  36
  37 case "$1" in
  38     start)
  39         check4root || exit 1
  40         einfo "Starting sniffing setup"
  41         eindent
  42             einfo "Creating bridge device"
  43             brctl addbr "$BRIDGE_NAME"
  44             eend $?
  45
  46             einfo "Bringing network device in promiscuous mode up:"
  47             eindent
  48                for i in $BRIDGE_DEVICES ; do
  49                    einfo "$i"
  50                    ifconfig "$i" -arp promisc 0.0.0.0 up ; eend $?
  51                done
  52             eoutdent
  53
  54             einfo "Adding network devices to $BRIDGE_NAME:"
  55             eindent
  56             for i in $BRIDGE_DEVICES ; do
  57                 einfo "$i"
  58                 brctl addif "$BRIDGE_NAME" $i  ; eend $?
  59             done
  60             eoutdent
  61
  62             einfo "Bringing bridge $BRIDGE_NAME in promiscuous up"
  63             ip link set "$BRIDGE_NAME" promisc on up ; eend $?
  64         eoutdent
  65    ;;
  66
  67    stop)
  68         check4root || exit 1
  69         einfo "Stopping sniffing setup"
  70         eindent
  71             einfo "Removing network devices from $BRIDGE_NAME: "
  72
  73             eindent
  74                for i in $BRIDGE_DEVICES ; do
  75                    einfo "$i "
  76                    brctl delif "$BRIDGE_NAME" $i  ; eend $?
  77                done
  78             eoutdent
  79
  80             einfo "Disabling promiscuous mode on: "
  81             eindent
  82                for i in $BRIDGE_DEVICES ; do
  83                    einfo "$i "
  84                    ip link set "$i" promisc off ; eend $?
  85                done
  86             eoutdent
  87
  88             einfo "Bringing bridge $BRIDGE_NAME down"
  89             ip link set "$BRIDGE_NAME" down; eend $?
  90
  91             einfo "Removing bridge device $BRIDGE_NAME"
  92             ifconfig "$BRIDGE_NAME" down || /bin/true
  93             brctl delbr "$BRIDGE_NAME"
  94             eend $?
  95         eoutdent
  96    ;;
  97
  98    restart)
  99         check4root || exit 1
 100         $0 stop
 101         sleep 1
 102         $0 start
 103    ;;
 104
 105    info|-h|--help)
 106         usage_info
 107    ;;
 108
 109    status)
 110         check4root || exit 1
 111         einfo "$0 - status:"
 112         $BRCTL show ; eend $?
 113    ;;
 114
 115    *)
 116         echo "Usage: $0 {start|stop|restart|status|info}"
 117         exit 1
 118    ;;
 119 esac
 120
 121 ## END OF FILE #################################################################
 122 # vim: ft=sh expandtab ai