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 # Latest change: Mit Mär 26 23:02:52 CET 2008 [mika]
   8 ################################################################################
   9
  10 # exit on any error
  11 set -e
  12
  13 CONFIG_FILE=/etc/grml/routersetup
  14 . /etc/grml/lsb-functions
  15 . /etc/grml/script-functions
  16
  17 check4root
  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 "$STP"   ] || STP=on
  33 [ -n "$BRIDGE_NAME" ] || BRIDGE_NAME=br0
  34
  35 check4progs $BRCTL || exit 1
  36
  37 case "$1" in
  38     start)
  39         einfo "Starting bridge"
  40         eindent
  41             einfo "Creating bridge device"
  42             brctl addbr "$BRIDGE_NAME"
  43             eend $?
  44             case "$BRIDGE_STP" in
  45                 no|false)
  46                     ;;
  47                 *)
  48                     einfo "Setting Spanning-Tree Protocol (STP) to status $STP"
  49                     brctl stp "$BRIDGE_NAME" $STP
  50                     eend $?
  51                     ;;
  52             esac
  53
  54             einfo "Bringing network device up: "
  55             eindent
  56                for i in $BRIDGE_DEVICES ; do
  57                    einfo "$i"
  58                    ifconfig "$i" 0.0.0.0 up ; eend $?
  59                done
  60             eoutdent
  61
  62             einfo "Enabling promiscous mode on: "
  63             eindent
  64                for i in $BRIDGE_DEVICES ; do
  65                    einfo "$i"
  66                    ip link set "$i" promisc on ; eend $?
  67                done
  68             eoutdent
  69
  70             einfo "Adding network devices to $BRIDGE_NAME: "
  71             eindent
  72             for i in $BRIDGE_DEVICES ; do
  73                 einfo "$i"
  74                 brctl addif "$BRIDGE_NAME" $i  ; eend $?
  75             done
  76             eoutdent
  77
  78             einfo "Bringing bridge $BRIDGE_NAME up"
  79             ip link set "$BRIDGE_NAME" up ; eend $?
  80             eindent
  81                case $BRIDGE_CONFIG in
  82                        DHCP)
  83                          einfo "starting dhclient for $BRIDGE_NAME"
  84                          dhclient -pf /var/run/dhclient.$BRIDGE_NAME.pid -lf /var/run/dhclient.$BRIDGE_NAME.leases $BRIDGE_NAME
  85                        ;;
  86                        FIXED)
  87                          einfo "Setting IP for $BRIDGE_NAME to $BRIDGE_IP"
  88                          ip a a $BRIDGE_IP dev $BRIDGE_NAME
  89                        ;;
  90                        NONE)
  91                          einfo "Leaving $BRIDGE_NAME uconfigured"
  92                        ;;
  93                esac
  94             eoutdent
  95         eoutdent
  96    ;;
  97
  98    stop)
  99         einfo "Stopping bridge"
 100         eindent
 101             if [ $BRIDGE_CONFIG = DHCP ]; then
 102                einfo "Terminating dhclient for $BRIDGE_NAME"
 103                if [ -r "/var/run/dhclient.$BRIDGE_NAME.pid" ] ; then
 104                  kill "$(cat /var/run/dhclient.$BRIDGE_NAME.pid)" || /bin/true
 105                fi
 106             fi
 107             einfo "Removing network devices from $BRIDGE_NAME: "
 108
 109             eindent
 110                for i in $BRIDGE_DEVICES ; do
 111                    einfo "$i "
 112                    brctl delif "$BRIDGE_NAME" $i  ; eend $?
 113                done
 114             eoutdent
 115
 116             einfo "Disabling promiscous mode on: "
 117             eindent
 118                for i in $BRIDGE_DEVICES ; do
 119                    einfo "$i "
 120                    ip link set "$i" promisc off ; eend $?
 121                done
 122             eoutdent
 123
 124             einfo "Bringing bridge: $BRIDGE_NAME down"
 125             ip link set "$BRIDGE_NAME" down; eend $?
 126
 127             einfo "Removing bridge device"
 128             ifconfig "$BRIDGE_NAME" down || /bin/true
 129             brctl delbr "$BRIDGE_NAME"
 130             eend $?
 131         eoutdent
 132    ;;
 133
 134    restart)
 135         $0 stop
 136         sleep 1
 137         $0 start
 138    ;;
 139
 140    info)
 141         einfo "$0 - script which turns on basic bridging capabilities"
 142         einfo "Configure via $CONFIG_FILE" ; eend 0
 143    ;;
 144
 145    status)
 146         einfo "$0 - status:"
 147         $BRCTL show ; eend $?
 148    ;;
 149
 150    *)
 151         echo "Usage: $0 {start|stop|restart|status|info}"
 152         exit 1
 153    ;;
 154 esac
 155
 156 ## END OF FILE #################################################################
 157 # vim: ft=sh expandtab ai