docker-scripts/bridge-default-route at master · docbill/docker-scripts · GitHub

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#!/bin/bash
# Script to create a bridge for the default route
# Copyright (C) 2014 docbill@gmail.com

#   This program is free software: you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation, either version 3 of the License, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program.  If not, see <http://www.gnu.org/licenses/>.

METRIC=1
CTL=default
eval $(route -n |tr '\t' ' '|sed -n -e 's,^0\.0\.0\.0  *\([0-9.][0-9.]*\)  *0\.0\.0\.0  *UG  *\([0-9][0-9]*\) .* \([^ ]*\)$,XMETRIC=\2;GATEWAY=\1;INTERFACE=\3,p'|sort -n|head)

needUsage=0

BRIDGE="$1"
shift
while [ $# -gt 0 ]
do
  option="$1"
  case "$1" in
    [Cc][Tt][Ll] )
      shift
      CTL="$1"
      ;;
    [Gg][Aa][Tt]* )
      shift
      GATEWAY="$1"
      ;;
    [Mm][Ee][Tt]* )
      shift
      METRIC="$1"
      ;;
    [Dd][Ee][Vv]* )
      shift
      INTERFACE="$1"
      ;;
    *)
      needUsage=1
      echo "Unrecognized option '$1'" 1>&2
      ;;
  esac
  shift
done
if [ $needUsage -eq 0 ]
then
  if [ -z "$BRIDGE" ]
  then
    needUsage=1
    echo "Unknown bridge" 1>&2
  elif [ -z "$CTL" ]
  then
    needUsage=1
    echo "Unknown ctl" 1>&2
  elif [ -z "$GATEWAY" ]
  then
    needUsage=1
    echo "Unknown gateway" 1>&2
  elif [ -z "$METRIC" ]
  then
    needUsage=1
    echo "Unknown metric" 1>&2
  elif [ -z "$INTERFACE" ]
  then
    needUsage=1
    echo "Unknown dev" 1>&2
  fi
fi
if [ $needUsage -eq 1 ]
then
  echo "Usage: "\""$0"\"" <BRIDGE> [ctl <brctl|ovs-vsctl>] [gateway <GATEWAY>] \\ " 1>&2
  echo "  [metric <METRIC>] [dev <INTEFACE>]" 1>&2
  echo " " 1>&2
  echo "Creates a new bridge and routes the network through that bridge." 1>&2
  echo "e.g. " 1>&2
  echo \""$0"\"" br0 ctl ovs-vsctl gateway 172.31.253.1 metric 1 dev em1" 1>&2
  exit 1
fi
b0=${0#*/}
if [ "$CTL" = "default" ]
then
  if ( ovs-vsctl list-br 2>>/dev/null 1>>/dev/null )
  then
    CTL=ovs-vsctl
  else
    CTL=brctl
  fi
fi
if [ "$CTL" = "ovs-vsctl" ]
then
  ovs-vsctl add-br "$BRIDGE"
else
  brctl addbr "$BRIDGE"
fi
ifconfig "$BRIDGE" up
if [ "$CTL" = "ovs-vsctl" ]
then
  ovs-vsctl add-port "$BRIDGE" "$INTERFACE"
else
  brctl addif "$BRIDGE" "$INTERFACE"
fi
ifconfig "$INTERFACE" 0
dhclient -r "$INTERFACE"
dhclient "$BRIDGE"
route add -host $GATEWAY metric "$METRIC" dev "$BRIDGE"