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371 lines
12 KiB
Bash
371 lines
12 KiB
Bash
#!/bin/sh
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#
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# Copyright (c) 2010, Yavuz Gokirmak
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#
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# All rights reserved.
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#
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# This source code may be used, modified, copied, distributed, and
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# sold, in both source and binary form provided that the above
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# copyright and these terms are retained, verbatim, as the first
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# lines of this file. Under no circumstances is the author
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# responsible for the proper functioning of the software nor does
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# the author assume any responsibility for damages incurred with
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# its use.
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#
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# $FreeBSD$
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#
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# This script creates and connects n router like nodes. Complex wide
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# area topologies can be created with the help of script.
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#
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# Virtual nodes are generated via jails and network connections are
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# established using ng_eiface(4) node types.
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#
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# To use this script:
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#
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# 0. Make your own copy of this example script.
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#
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# 1. Edit the definition of ${TARGET_TOPOLOGY} to define your virtual
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# nodes. Virtual topology definition includes node names and their
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# IP address. Target top. syntax: ( name|ip<->name|ip ... )
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# Example 1: ( n1|10.0.2.1/30<->n2|10.0.2.2/30 ...)
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# Example 2: ( n1|2001:b90::14a/125<->n1|2001:b90::14b/125 ...)
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#
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# 2. Run this script with "start" as the command line argument.
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#
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# 3. Add necessary static route commands for each virtual node. For
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# example assume you have three virtual nodes connected each other
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# like a chain (n1 is connected to n2, n2 is connected to n3).
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# In order to establish connectivity among these virtual nodes,
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# you have to add default routes to node n1 and node n3. Example
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# static route command is:
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# STATIC_ROUTE0="jexec n1 route add -inet default 10.0.2.2"
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# STATIC_ROUTE1="jexec n3 route add -inet default 10.0.2.5"
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# After defining default routes with above format you have to set
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# the total number of static route commands as:
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# STATIC_ROUTE_CNT=2
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#
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# 4. Stop bridging by running this script with "stop" as the
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# command line argument.
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#
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# 5. This script uses a template file in order to carry information
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# between start and stop calls.
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# In the start call, the netgraph interfaces and jails are created.
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# At the stop phase, all created objects should be removed.
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# DO NOT delete the temporary file between the start and stop phases.
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#
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# Target Topology:
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#
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# +---------------+ +---------------------------------------------+
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# | n1 (vimage) | | n2 (vimage) |
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# | | | |
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# | +-----------+ | | +-----------+ +-----------+ +-----------+ |
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# | | ngeth0 | | | | ngeth1 | | ngeth2 | | ngeth4 | |
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# | |(ng_eiface)| | | |(ng_eiface)| |(ng_eiface)| |(ng_eiface)| |
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# | +--+-----+--+ | | +--+-----+--+ +--+-----+--+ +--+-----+--+ |
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# | |ether| | | |ether| |ether| |ether| |
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# | +-X---+ | | +--X--+ +--X--+ +--X--+ |
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# +-------X-------+ +------X--------------X---------------X-------+
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# X X X X
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# X X X X
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# XXXXXXXXXXXXXXX X X
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# X X
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# +--------X------+ +--------X------+
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# | -+--X--+- | | -+--X--+- |
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# | |ether| | | |ether| |
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# | +--+-----+--+ | | +--+-----+--+ |
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# | | ngeth3 | | | | ngeth5 | |
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# | |(ng_eiface)| | | |(ng_eiface)| |
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# | +-----------+ | | +-----------+ |
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# | | | |
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# | n3 (vimage) | | n4 (vimage) |
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# +---------------+ +---------------+
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#
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#
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#
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# List the names of virtual nodes and their IP addresses. Use ':'
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# character to separate node name from node IP address and netmask.
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TARGET_TOPOLOGY="n1|10.0.2.1/30<->n2|10.0.2.2/30 n2|10.0.2.5/30<->n3|10.0.2.6/30 n2|10.0.2.9/30<->n4|10.0.2.10/30"
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STATIC_ROUTE0="jexec n1 route add -inet default 10.0.2.2"
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STATIC_ROUTE1="jexec n3 route add -inet default 10.0.2.5"
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STATIC_ROUTE2="jexec n4 route add -inet default 10.0.2.9"
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STATIC_ROUTE_CNT=3
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# MAC manufacturer prefix. This can be modified according to needs.
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MAC_PREFIX="00:1d:92"
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# Temporary file is important for proper execution of script.
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TEMP_FILE="/var/tmp/.virtual.chain.tmp"
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# Set root directory for jails to be created.
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JAIL_PATH="/usr/jails/router"
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####################################################################
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#### Nothing below this point should need to be modified. ####
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####################################################################
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# Start/restart routine.
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virtual_chain_start() {
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# Load netgraph KLD's as necessary.
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for KLD in ng_ether ng_bridge ng_eiface; do
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if ! kldstat -v | grep -qw ${KLD}; then
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echo -n "Loading ${KLD}.ko... "
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kldload ${KLD} || exit 1
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echo "done"
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fi
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done
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# Reset all interfaces and jails. If temporary file can not be found
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# script assumes that there is no previous configuration.
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if [ ! -e ${TEMP_FILE} ]; then
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echo "No previous configuration(${TEMP_FILE}) found to clean-up."
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else
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echo -n "Cleaning previous configuration..."
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virtual_chain_stop
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echo "done"
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fi
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# Create temporary file for usage. This file includes generated
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# interface names and jail names. All bridges, interfaces and jails
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# are written to file while created. In clean-up process written
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# objects are cleaned (i.e. removed) from system.
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if [ -e ${TEMP_FILE} ]; then
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touch ${TEMP_FILE}
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fi
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# Attach other interfaces as well.
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for CONNECTION in ${TARGET_TOPOLOGY}; do
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# Virtual connections are defined in TARGET_TOPOLOGY variable.
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# They have the form of 'nodeName|IPaddr'. Below two lines split
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PEER1=`echo ${CONNECTION} | awk -F"<->" '{print $1}'`
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PEER1_NAME=`echo ${PEER1} | awk -F"|" '{print $1}'`
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PEER1_IP=`echo ${PEER1} | awk -F"|" '{print $2}'`
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PEER2=`echo ${CONNECTION} | awk -F"<->" '{print $2}'`
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PEER2_NAME=`echo ${PEER2} | awk -F"|" '{print $1}'`
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PEER2_IP=`echo ${PEER2} | awk -F"|" '{print $2}'`
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# !!! if not created already..
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# Create virtual node (jail) with given name and using
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# JAIL_PATH as root directory for jail.
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virtual_chain_create_peer_if_necessary ${PEER1_NAME}
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virtual_chain_create_peer_if_necessary ${PEER2_NAME}
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# create an interface for peer with the given peer IP. Get interface
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# for future use; you will connect this interface to the other
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# peers' (PEER2) interface.
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virtual_chain_create_interface_with_ip ${PEER1_NAME} ${PEER1_IP}
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PEER1_INTERFACE=${RET_INTERFACE}
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# create an interface for peer with the given peer IP. Get interface
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# for future use; you will connect this interface to the other
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# peers' (PEER2) interface.
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virtual_chain_create_interface_with_ip ${PEER2_NAME} ${PEER2_IP}
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PEER2_INTERFACE=${RET_INTERFACE}
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# Connect virtual interface to other interface. Syntax is :
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# ngctl connect INTERFACE1: INTERFACE2: ether ether.
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echo -n "Connecting ${PEER1_INTERFACE}:ether to ${PEER2_INTERFACE}:ether..."
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ngctl connect ${PEER1_INTERFACE}: ${PEER2_INTERFACE}: ether ether \
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|| exit 1
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echo "done"
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done
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# Executes static route add commands.
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i=0
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while [ $i != $STATIC_ROUTE_CNT ]; do
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eval ROUTE=\${STATIC_ROUTE${i}}
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ret=`${ROUTE}`
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i=`expr $i + 1`
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done
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echo "Virtual WAN established successfully!"
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}
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virtual_chain_create_interface_with_ip() {
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NODE_NAME=$1
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NODE_IP=$2
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# Create a ng_eiface object for virtual node. ng_eiface
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# object has a hook that can be connected to one of bridge
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# links. After creating interface get its automatically
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# generated name for further usage.
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echo "Creating eiface interface for virtual node ${NODE_NAME}."
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ngctl mkpeer eiface ether ether
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EIFACE=`ngctl l | grep ngeth | tail -n 1| awk '{print $2}'`
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echo "Interface ${EIFACE} is created."
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# Write name of the interface to temp file. Clean-up procedure
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# will use this name to shutdown interface.
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echo "interface ${EIFACE}" >> ${TEMP_FILE}
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# Move virtual interface to virtual node. Note that Interface
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# name will not be changed at the end of this movement. Moved
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# interface can be seen at the output of ifconfig command in
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# jail: 'jexec jailname ifconfig'
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echo "Moving ${EIFACE} to ${NODE_NAME}"
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ifconfig ${EIFACE} vnet ${NODE_NAME}
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# Make lo0 interface localhost.
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jexec ${NODE_NAME} ifconfig lo0 localhost
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# Generate a random mac address for virtual interface. First
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# three octets can be changed by user. Last three octets are
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# generated randomly.
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M4=`od -An -N2 -i /dev/random | sed -e 's/ //g' | \
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awk '{ print $1 % 256 }'`
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M5=`od -An -N2 -i /dev/random | sed -e 's/ //g' | \
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awk '{ print $1 % 256 }'`
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M6=`od -An -N2 -i /dev/random | sed -e 's/ //g' | \
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awk '{ print $1 % 256 }'`
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MAC=`printf ${MAC_PREFIX}:%02x:%02x:%02x ${M4} ${M5} ${M6}`
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# Set the link address (mac address) of virtual interface in
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# virtual node to randomly generated MAC.
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echo "Setting MAC address of ${EIFACE} to '${MAC}'"
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jexec ${NODE_NAME} ifconfig ${EIFACE} link $MAC
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# Either IPv4 or IPv6 can be used in this script. Ifconfig
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# IP setting syntax differs slightly for two IP versions.
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# For version 4 'inet' keyword is used whereas for version 6
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# 'inet6' is used. Below line tries to decide which IP version
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# is given and sets IPVER to 'inet' or 'inet6'.
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IPVER=`echo ${NODE_IP} | awk -F"." '{ split($4,last,"/"); \
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if( NF==4 && $1>0 && $1<256 && $2<256 && $3<256 && \
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last[1]<256) print "inet"; else print "inet6"}'`
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# Set IP address of virtual interface in virtual node.
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echo "Setting IP address of ${EIFACE} to '${NODE_IP}'"
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jexec ${NODE_NAME} ifconfig ${EIFACE} ${IPVER} ${NODE_IP}
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RET_INTERFACE=${EIFACE}
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}
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virtual_chain_create_peer_if_necessary() {
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if ! grep -q $1 ${TEMP_FILE} ; then
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echo -n "Creating virtual node (jail) ${1}..."
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jail -c vnet name=${1} host.hostname=${1} \
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path=${JAIL_PATH} persist
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jexec ${1} sysctl -w net.inet.ip.forwarding=1
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jexec ${1} sysctl -w net.inet6.ip6.forwarding=1
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echo "done"
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# Write name of the jail to temp file. Clean-up
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# procedure will use this name to remove jail.
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echo "node ${1}" >> ${TEMP_FILE}
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fi
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}
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# Stop routine.
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virtual_chain_stop() {
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if [ ! -e ${TEMP_FILE} ]; then
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echo "Nothing to stop! ${TEMP_FILE}: temp file not found"
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else
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echo -n "Shutdown bridge interface.."
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OBJECTS=`cat ${TEMP_FILE} | grep bridge | awk '{print $2}'`
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for BRIDGE in ${OBJECTS}; do
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ngctl shutdown ${BRIDGE}: >/dev/null 2>&1
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done
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echo "done"
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echo -n "Shutdown all eiface interfaces..."
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OBJECTS=`cat ${TEMP_FILE} | grep interface | awk '{print $2}'`
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for INTERFACE in ${OBJECTS}; do
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ngctl shutdown ${INTERFACE}: >/dev/null 2>&1
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done
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echo "done"
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echo -n "Removing all jails..."
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OBJECTS=`cat ${TEMP_FILE} | grep node | awk '{print $2}'`
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for NODE in ${OBJECTS}; do
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jail -r ${NODE}
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done
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echo "done"
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echo "Removing tempfile ${TEMP_FILE}"
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rm ${TEMP_FILE}
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fi
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echo "Virtual LAN objects removed successfully!"
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}
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virtual_chain_usage() {
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echo "usage: $0 start [target_topology]"
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echo " : $0 [ stop | help ]"
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}
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# Main entry point.
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case $# in
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1)
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case $1 in
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start)
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echo -n "Creating default target topology:"
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echo " ${TARGET_TOPOLOGY}"
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virtual_chain_start
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;;
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stop)
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if [ ! -e ${TEMP_FILE} ]; then
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echo -n "Noting to stop! ${TEMP_FILE}:"
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echo " temp file not found"
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else
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virtual_chain_stop
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fi
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;;
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help)
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virtual_chain_usage
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exit 1
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;;
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*)
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virtual_chain_usage
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exit 1
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esac
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;;
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2)
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case $1 in
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start)
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TARGET_TOPOLOGY=$2
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echo -n "Creating target topology:"
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echo "${TARGET_TOPOLOGY}"
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virtual_chain_start
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;;
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*)
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virtual_chain_usage
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exit 1
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esac
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;;
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*)
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virtual_chain_usage
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exit 1
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esac
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