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https://github.com/vdsm/virtual-dsm.git
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54 lines
1.7 KiB
Bash
54 lines
1.7 KiB
Bash
#!/usr/bin/env bash
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set -eu
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[ ! -e /dev/net/tun ] && echo "Error: TUN interface not available..." && exit 85
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# A bridge of this name will be created to host the TAP interface created for
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# the VM
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QEMU_BRIDGE='qemubr0'
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# DHCPD must have an IP address to run, but that address doesn't have to
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# be valid. This is the dummy address dhcpd is configured to use.
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DUMMY_DHCPD_IP='10.0.0.1'
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# These scripts configure/deconfigure the VM interface on the bridge.
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QEMU_IFUP='/run/qemu-ifup'
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QEMU_IFDOWN='/run/qemu-ifdown'
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# The name of the dhcpd config file we make
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DHCPD_CONF_FILE='dhcpd.conf'
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function default_intf() {
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ip -json route show |
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jq -r '.[] | select(.dst == "default") | .dev'
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}
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# First step, we run the things that need to happen before we start mucking
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# with the interfaces. We start by generating the DHCPD config file based
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# on our current address/routes. We "steal" the container's IP, and lease
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# it to the VM once it starts up.
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/run/generate-dhcpd-conf $QEMU_BRIDGE > $DHCPD_CONF_FILE
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default_dev=$(default_intf)
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# Now we start modifying the networking configuration. First we clear out
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# the IP address of the default device (will also have the side-effect of
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# removing the default route)
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ip addr flush dev "$default_dev"
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# Next, we create our bridge, and add our container interface to it.
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ip link add "$QEMU_BRIDGE" type bridge
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ip link set dev "$default_dev" master "$QEMU_BRIDGE"
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# Then, we toggle the interface and the bridge to make sure everything is up
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# and running.
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ip link set dev "$default_dev" up
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ip link set dev "$QEMU_BRIDGE" up
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# Prevent error about missing file
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touch /var/lib/misc/udhcpd.leases
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# Finally, start our DHCPD server
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udhcpd -I $DUMMY_DHCPD_IP -f $DHCPD_CONF_FILE 2>&1 &
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exit 0
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