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 "$CONFIG_FILE" ] ; then
  16   . "$CONFIG_FILE"
  17 else
  18   ewarn "Could not read $CONFIG_FILE"
  19 fi
  20
  21 # defaults if unconfigured
  22 [ -n "$BRCTL" ]          || BRCTL=brctl
  23 [ -n "$BRIDGE_STP"   ]   || BRIDGE_STP=on
  24 [ -n "$BRIDGE_NAME" ]    || BRIDGE_NAME=br0
  25 [ -n "$BRIDGE_DEVICES" ] || BRIDGE_DEVICES='eth0 eth1'
  26
  27 check4progs $BRCTL || exit 1
  28
  29 case "$1" in
  30     start)
  31         einfo "Starting bridge"
  32         eindent
  33             einfo "Creating bridge device"
  34             brctl addbr "$BRIDGE_NAME"
  35             eend $?
  36             case "$BRIDGE_STP" in
  37                 no|false)
  38                     ;;
  39                 *)
  40                     einfo "Setting Spanning-Tree Protocol (STP) to status $BRIDGE_STP"
  41                     brctl stp "$BRIDGE_NAME" "$BRIDGE_STP"
  42                     eend $?
  43                     ;;
  44             esac
  45
  46             einfo "Bringing network device up: "
  47             eindent
  48                for i in $BRIDGE_DEVICES ; do
  49                    einfo "$i"
  50                    ifconfig "$i" 0.0.0.0 up ; eend $?
  51                done
  52             eoutdent
  53
  54             einfo "Enabling promiscuous mode on: "
  55             eindent
  56                for i in $BRIDGE_DEVICES ; do
  57                    einfo "$i"
  58                    ip link set "$i" promisc on ; eend $?
  59                done
  60             eoutdent
  61
  62             einfo "Adding network devices to $BRIDGE_NAME: "
  63             eindent
  64             for i in $BRIDGE_DEVICES ; do
  65                 einfo "$i"
  66                 brctl addif "$BRIDGE_NAME" $i  ; eend $?
  67             done
  68             eoutdent
  69
  70             einfo "Bringing bridge $BRIDGE_NAME up"
  71             ip link set "$BRIDGE_NAME" up ; eend $?
  72             eindent
  73                case $BRIDGE_CONFIG in
  74                        DHCP)
  75                          einfo "starting dhclient for $BRIDGE_NAME"
  76                          dhclient -pf /var/run/dhclient.$BRIDGE_NAME.pid -lf /var/run/dhclient.$BRIDGE_NAME.leases $BRIDGE_NAME
  77                        ;;
  78                        FIXED)
  79                          einfo "Setting IP for $BRIDGE_NAME to $BRIDGE_IP"
  80                          ip a a $BRIDGE_IP dev $BRIDGE_NAME
  81                        ;;
  82                        NONE)
  83                          einfo "Leaving $BRIDGE_NAME unconfigured"
  84                        ;;
  85                esac
  86             eoutdent
  87         eoutdent
  88    ;;
  89
  90    stop)
  91         einfo "Stopping bridge"
  92         eindent
  93             if [ $BRIDGE_CONFIG = DHCP ]; then
  94                einfo "Terminating dhclient for $BRIDGE_NAME"
  95                if [ -r "/var/run/dhclient.$BRIDGE_NAME.pid" ] ; then
  96                  kill "$(cat /var/run/dhclient.$BRIDGE_NAME.pid)" || /bin/true
  97                fi
  98             fi
  99             einfo "Removing network devices from $BRIDGE_NAME: "
 100
 101             eindent
 102                for i in $BRIDGE_DEVICES ; do
 103                    einfo "$i "
 104                    brctl delif "$BRIDGE_NAME" $i  ; eend $?
 105                done
 106             eoutdent
 107
 108             einfo "Disabling promiscuous mode on: "
 109             eindent
 110                for i in $BRIDGE_DEVICES ; do
 111                    einfo "$i "
 112                    ip link set "$i" promisc off ; eend $?
 113                done
 114             eoutdent
 115
 116             einfo "Bringing bridge: $BRIDGE_NAME down"
 117             ip link set "$BRIDGE_NAME" down; eend $?
 118
 119             einfo "Removing bridge device"
 120             ifconfig "$BRIDGE_NAME" down || /bin/true
 121             brctl delbr "$BRIDGE_NAME"
 122             eend $?
 123         eoutdent
 124    ;;
 125
 126    restart)
 127         $0 stop
 128         sleep 1
 129         $0 start
 130    ;;
 131
 132    info)
 133         einfo "$0 - script which turns on basic bridging capabilities"
 134         einfo "Configure via $CONFIG_FILE" ; eend 0
 135    ;;
 136
 137    status)
 138         einfo "$0 - status:"
 139         $BRCTL show ; eend $?
 140    ;;
 141
 142    *)
 143         echo "Usage: $0 {start|stop|restart|status|info}"
 144         exit 1
 145    ;;
 146 esac
 147
 148 ## END OF FILE #################################################################
 149 # vim: ft=sh expandtab ai