360 lines
12 KiB
Bash
360 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 adds virtual nodes to one of the physical interfaces
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# visible on your local area network (LAN). Virtual nodes seems real
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# to external observers.
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# If traceroute is executed to one of virtual nodes, the IP
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# address of the physical interface will not be seen in the output.
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# Virtual nodes are generated via jails and network connections are
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# established using ng_bridge(4) and 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 ${ETHER_INTF} as described below
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# to define your real interface connected to the LAN. Virtual nodes
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# will placed on the same physical network as this interface.
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#
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# 2. 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: ( node1|ip1/24 node2|ip2/24 ... )
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# Example 1: ( n1|122.122.122.12/24, n2|122.122.122.13/24 ...)
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# Example 2: ( n1|2001:b90::14a/125, n1|2001:b90::14b/125 ...)
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#
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# 3. Run this script with "start" as the command line argument.
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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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# To add virtual nodes for multiple independent LANs, create multiple
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# copies of this script with different variable definitions.
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#
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# Target Topology:
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#
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#
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# +---------------+ +---------------+ +---------------+
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# | n0 (vimage) | | n1 (vimage) | | nk (vimage) |
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# | | | | | |
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# | +-----------+ | | +-----------+ | | +-----------+ |
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# | | ngeth0 | | | | ngeth1 | | | | ngethk | |
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# | |(ng_eiface)| | | |(ng_eiface)| | | |(ng_eiface)| |
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# | +--+-----+--+ | | +--+-----+--+ | | +--+-----+--+ |
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# | |ether| | | |ether| | | |ether| |
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# | +--X--+ | | +--X--+ | | +---X-+ |
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# +-----+ +--------\------+ +--------\------+ +-------/-------+
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# |upper|----\ \ip_addr \ip_addr /ip_addr
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# +-+-----+--+ \ \ \ \
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# | em0 | \ +--------+ +-+ \
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# |(ng_ether)| +-----------+ \ \ \
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# +-+-----+--+ \ \ / \
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# |lower| +---------\ \ \ / /
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# +--X--+ / O--X--O O-X---O O---X-O O--X--O O---X---O
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# \ | |link0| |link1| |link2| |link3| |linkk+2|
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# \ / +-O-----O-O-----O-O-----O-O-----O-----O-------O-+
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# +---+ | |
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# | bridge (ng_bridge) |
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# +-----------------------------------------------+
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#
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#
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# Give the name of ethernet interface. Virtual nodes will be seen as
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# local neighbours of this interface.
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ETHER_INTF="em0"
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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="c1|10.0.2.20/24 c2|10.0.2.21/24 c3|10.0.2.22/24"
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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.lan.tmp"
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# Set root directory for jails to be created.
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JAIL_PATH="/usr/jails/node"
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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_lan_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_lan_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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echo -n "Verifying ethernet interface existence..."
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# Verify ethernet interface exist.
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if ! ngctl info ${ETHER_INTF}: >/dev/null 2>&1; then
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echo "Error: interface ${ETHER_INTF} does not exist"
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exit 1
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fi
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ifconfig ${ETHER_INTF} up || exit 1
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echo "done"
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# Get current number of bridge interfaces in the system. This number
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# is used to create a name for new bridge.
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BRIDGE_COUNT=`ngctl l | grep bridge | wc -l | sed -e "s/ //g"`
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BRIDGE_NAME="bridge${BRIDGE_COUNT}"
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# Create new ng_bridge(4) node and attach it to the ethernet interface.
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# Connect ng_ether:lower hook to bridge:link0 when creating bridge and
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# connect ng_ether:upper hook to bridge:link1 after bridge name is set.
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echo "Creating bridge interface: ${BRIDGE_NAME}..."
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ngctl mkpeer ${ETHER_INTF}: bridge lower link0 || exit 1
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ngctl name ${ETHER_INTF}:lower ${BRIDGE_NAME} || exit 1
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ngctl connect ${ETHER_INTF}: ${BRIDGE_NAME}: upper link1 || exit 1
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echo "Bridge ${BRIDGE_NAME} is created and ${ETHER_INTF} is connected."
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# In the above code block two hooks are connected to bridge interface,
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# therefore LINKNUM is set to 2 indicating total number of connected
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# hooks on the bridge interface.
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LINKNUM=2
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# Write name of the bridge to temp file. Clean-up procedure will use
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# this name to shutdown bridge interface.
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echo "bridge ${BRIDGE_NAME}" > ${TEMP_FILE}
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# Attach other interfaces as well.
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for NODE in ${TARGET_TOPOLOGY}; do
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# Virtual nodes are defined in TARGET_TOPOLOGY variable. They
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# have the form of 'nodeName|IPaddr'. Below two lines split
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# node definition to get node name and node IP.
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NODE_NAME=`echo ${NODE} | awk -F"|" '{print $1}'`
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NODE_IP=`echo ${NODE} | awk -F"|" '{print $2}'`
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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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echo -n "Creating virtual node (jail) ${NODE_NAME}..."
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jail -c vnet name=${NODE_NAME} host.hostname=${NODE_NAME} \
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path=${JAIL_PATH} persist
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echo "done"
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# Write name of the jail to temp file. Clean-up procedure will
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# use this name to remove jail.
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echo "node ${NODE_NAME}" >> ${TEMP_FILE}
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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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# Connect virtual interface to bridge interface. Syntax is :
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# ngctl connect INTERFACE: BRIDGE: INTERFACE_HOOK EMPTY_LINK.
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# Interface has one hook named 'ether' and below line connects
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# ether hook to bridge's first unconnected link.
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echo -n "Connecting ${EIFACE}:ether to ${BRIDGE_NAME}:link${LINKNUM}..."
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ngctl connect ${EIFACE}: ${BRIDGE_NAME}: ether link${LINKNUM} \
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|| exit 1
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echo "done"
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# Now, bridge has one more connected link thus link count is
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# incremented.
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LINKNUM=`expr ${LINKNUM} + 1`
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done
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echo "Virtual LAN established successfully!"
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}
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# Stop routine.
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virtual_lan_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_lan_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_lan_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_lan_stop
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fi
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;;
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help)
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virtual_lan_usage
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exit 1
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;;
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*)
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virtual_lan_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_lan_start
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;;
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*)
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virtual_lan_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_lan_usage
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exit 1
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esac
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