133 lines
3.5 KiB
Bash
Executable file
133 lines
3.5 KiB
Bash
Executable file
#!/usr/bin/bash
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# Set global variables
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Usage="
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set-tap.sh [PARAMETTER] [OPTION]
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set up a bridge and a tap interface. Use either doas or sudo to get the root access. Please make sure that you account have access to theses commands.
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This script will use either doas or sudo to access the root user and do some temporary modifications. You will be able to see some with 'ip a' command
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Please do your best to not make any mistakes in the options, or else you can be obliged to reboot your computer.
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PARAMETTER available
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-h, --help Print this help message and quit
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-v, --version Print the version of this program and quit
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OPTION available
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--add-br-id=<bridge-id> Set the name for the new bridge interface, usually it is br0, br1, etc
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--rm-br-id=<bridge-id> Remove a bridge interface. Be carefull, it do no verification wheither bridge-id is a real interface or a bridge interface.
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--addr=<address> Set an external address on the bridge. The external is the one accessible from the host.
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--replace=<interface> In case you want to replace the main connexion of your computer so that only the vm will be able to reach the external network, replace interface by the interface you want to replace, and make sure that the --addr is set to one of the ip on the interace. Please not that it will be possible for your host to lost all connection to the external internet with this parametter.
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"
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Version="1.0"
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add_bridge() {
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echo "add bridge interface ${bridge}"
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${rooter} ip link add ${bridge} type bridge
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#echo "no interface to link with bridge ${bridge}"
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#$rooter ip link set dev wlan0 master br0
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echo "authorise qemu to use as interface ${bridge} as bridge"
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if cat /etc/qemu/bridge.conf | grep -q "${bridge}"
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then
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echo "pass, bridge already authorised"
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else
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echo "allow ${bridge}" | doas tee -a /etc/qemu/bridge.conf
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echo "entry added to /etc/qemu/bridge.conf"
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fi
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echo "activate bridge ${bridge}"
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${rooter} ip link set dev ${bridge} up
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}
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rm_bridge() {
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echo "rm bridge interface ${bridge}"
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${rooter} ip link del ${bridge}
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}
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# detect the parametters
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for i in $@; do
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case "$i" in
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"-h" | "--help")
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echo "$Usage"
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exit 0
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;;
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"-v" | "--version")
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echo "$(basename $0) $Version"
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exit 0
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;;
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esac
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done
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# check if sudo is installed
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if which doas &> /dev/null
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then
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echo "use doas"
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rooter=$(which doas)
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elif which sudo &> /dev/null
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then
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echo "use sudo"
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rooter=$(which sudo)
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else
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echo "no command to give access to root is given. Abandon" >&2
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exit
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fi
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# detect the options
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for i in $@; do
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case "${i%=*}" in
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"--add-br-id")
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bridge="${i#*=}"
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echo "${bridge}"
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add_bridge
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;;
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"--rm-br-id")
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bridge="${i#*=}"
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echo "${bridge}"
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rm_bridge
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exit 0
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;;
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"--addr")
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address="${i#*=}"
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echo "${address}"
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;;
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"--replace")
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echo "--replace not yet supported, program stopped." >&2
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exit 1
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;;
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*)
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echo "parametter ${i%=*} not recognised" >&2
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exit 1
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;;
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esac
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done
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if [ "${bridge}" == "" ]
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then
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echo "Error, --bridge have to be specified to make the bridge" >&2
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exit
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fi
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if [ ! "${address}" == "" ]
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then
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${rooter} ip a add dev ${bridge} ${address}
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fi
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