sbin/grml-bridge

   1 #!/bin/sh
   2 # Filename:      grml-bridge
   3 # Purpose:       set up your box as bridge
   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 check4root || exit 1
  14
  15 if ! [ -r "$CONFIG_FILE" ] ; then
  16   eerror "$CONFIG_FILE could not be read."
  17   exit 1
  18 fi
  19
  20 . "$CONFIG_FILE"
  21
  22 if [ -z "$BRIDGE_DEVICES" ] ; then
  23    eerror "Bridge devices (\$BRIDGE_DEVICES) not set in $CONFIG_FILE"
  24    exit 1
  25 fi
  26
  27 [ -n "$BRCTL" ] || BRCTL=brctl
  28 [ -n "$STP"   ] || STP=on
  29 [ -n "$BRIDGE_NAME" ] || BRIDGE_NAME=br0
  30
  31 check4progs $BRCTL || exit 1
  32
  33 case "$1" in
  34     start)
  35         einfo "Starting bridge"
  36         eindent
  37             einfo "Creating bridge device"
  38             brctl addbr "$BRIDGE_NAME"
  39             eend $?
  40             case "$BRIDGE_STP" in
  41                 no|false)
  42                     ;;
  43                 *)
  44                     einfo "Setting Spanning-Tree Protocol (STP) to status $STP"
  45                     brctl stp "$BRIDGE_NAME" $STP
  46                     eend $?
  47                     ;;
  48             esac
  49
  50             einfo "Bringing network device up: "
  51             eindent
  52                for i in $BRIDGE_DEVICES ; do
  53                    einfo "$i"
  54                    ifconfig "$i" 0.0.0.0 up ; eend $?
  55                done
  56             eoutdent
  57
  58             einfo "Enabling promiscuous mode on: "
  59             eindent
  60                for i in $BRIDGE_DEVICES ; do
  61                    einfo "$i"
  62                    ip link set "$i" promisc on ; eend $?
  63                done
  64             eoutdent
  65
  66             einfo "Adding network devices to $BRIDGE_NAME: "
  67             eindent
  68             for i in $BRIDGE_DEVICES ; do
  69                 einfo "$i"
  70                 brctl addif "$BRIDGE_NAME" $i  ; eend $?
  71             done
  72             eoutdent
  73
  74             einfo "Bringing bridge $BRIDGE_NAME up"
  75             ip link set "$BRIDGE_NAME" up ; eend $?
  76             eindent
  77                case $BRIDGE_CONFIG in
  78                        DHCP)
  79                          einfo "starting dhclient for $BRIDGE_NAME"
  80                          dhclient -pf /var/run/dhclient.$BRIDGE_NAME.pid -lf /var/run/dhclient.$BRIDGE_NAME.leases $BRIDGE_NAME
  81                        ;;
  82                        FIXED)
  83                          einfo "Setting IP for $BRIDGE_NAME to $BRIDGE_IP"
  84                          ip a a $BRIDGE_IP dev $BRIDGE_NAME
  85                        ;;
  86                        NONE)
  87                          einfo "Leaving $BRIDGE_NAME unconfigured"
  88                        ;;
  89                esac
  90             eoutdent
  91         eoutdent
  92    ;;
  93
  94    stop)
  95         einfo "Stopping bridge"
  96         eindent
  97             if [ $BRIDGE_CONFIG = DHCP ]; then
  98                einfo "Terminating dhclient for $BRIDGE_NAME"
  99                if [ -r "/var/run/dhclient.$BRIDGE_NAME.pid" ] ; then
 100                  kill "$(cat /var/run/dhclient.$BRIDGE_NAME.pid)" || /bin/true
 101                fi
 102             fi
 103             einfo "Removing network devices from $BRIDGE_NAME: "
 104
 105             eindent
 106                for i in $BRIDGE_DEVICES ; do
 107                    einfo "$i "
 108                    brctl delif "$BRIDGE_NAME" $i  ; eend $?
 109                done
 110             eoutdent
 111
 112             einfo "Disabling promiscuous mode on: "
 113             eindent
 114                for i in $BRIDGE_DEVICES ; do
 115                    einfo "$i "
 116                    ip link set "$i" promisc off ; eend $?
 117                done
 118             eoutdent
 119
 120             einfo "Bringing bridge: $BRIDGE_NAME down"
 121             ip link set "$BRIDGE_NAME" down; eend $?
 122
 123             einfo "Removing bridge device"
 124             ifconfig "$BRIDGE_NAME" down || /bin/true
 125             brctl delbr "$BRIDGE_NAME"
 126             eend $?
 127         eoutdent
 128    ;;
 129
 130    restart)
 131         $0 stop
 132         sleep 1
 133         $0 start
 134    ;;
 135
 136    info)
 137         einfo "$0 - script which turns on basic bridging capabilities"
 138         einfo "Configure via $CONFIG_FILE" ; eend 0
 139    ;;
 140
 141    status)
 142         einfo "$0 - status:"
 143         $BRCTL show ; eend $?
 144    ;;
 145
 146    *)
 147         echo "Usage: $0 {start|stop|restart|status|info}"
 148         exit 1
 149    ;;
 150 esac
 151
 152 ## END OF FILE #################################################################
 153 # vim: ft=sh expandtab ai