149 lines
5.0 KiB
Bash
Executable File
149 lines
5.0 KiB
Bash
Executable File
#!/bin/bash
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# Run a raspbian image in qemu with network access
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# Tested with 2017-01-11-raspbian-jessie.img (and lite)
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#
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# Copyleft 2017 by Ignacio Nunez Hernanz <nacho _a_t_ ownyourbits _d_o_t_ com>
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# GPL licensed (see end of file) * Use at your own risk!
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#
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# Usage:
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# qemu-pi.sh 2017-01-11-raspbian-jessie.img # or any other image
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#
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# Notes:
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# If NO_NETWORK=0 it will include your network interface on a bridge
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# with the same gateway and routes, and restore it when exiting qemu
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#
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# If NO_NETWORK=1 (default), that configuration will have to be done manually
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# in order to obtain network access inside raspbian
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#
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# It requires a modified kernel image for qemu. (variable $KERNEL)
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#
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# It enables SSH on the image
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#
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# For the network bridge configuration, this needs to be in /etc/sudoers
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# Cmnd_Alias QEMU=/usr/bin/ip,/usr/bin/modprobe,/usr/bin/brctl
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# %kvm ALL=NOPASSWD: QEMU
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IMG=$1
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KERNEL=kernel-qemu-4.4.34-jessie
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NO_NETWORK=1 # set to 1 to skip network configuration
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IFACE=enp3s0 # interface that we currently use for internet
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BRIDGE=br0 # name for the bridge we will create to share network with the raspbian img
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MAC='52:54:be:36:42:a9' # comment this line for random MAC (maybe annoying if on DHCP)
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# sanity checks
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test -f $IMG && test -f $KERNEL || { echo "$IMG or $KERNEL not found"; exit; }
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[[ "$IFACE" == "" ]] || [[ "$BRIDGE" == "" ]] && NO_NETWORK=1
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# some more checks
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[[ "$NO_NETWORK" != "1" ]] && {
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IP=$( ip a | grep "global $IFACE" | grep -oP '\d{1,3}(.\d{1,3}){3}' | head -1 )
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[[ "$IP" == "" ]] && { echo "no IP found for $IFACE"; NO_NETWORK=1; }
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type brctl &>/dev/null || { echo "brctl is not installed"; NO_NETWORK=1; }
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modprobe tun &>/dev/null
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grep -q tun <(lsmod) || { echo "need tun module" ; NO_NETWORK=1; }
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}
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# network configuration
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[[ "$NO_NETWORK" != "1" ]] && {
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test -f /etc/qemu-ifup && cp -nav /etc/qemu-ifup /etc/qemu-ifup.bak
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test -f /etc/qemu-ifdown && cp -nav /etc/qemu-ifdown /etc/qemu-ifdown.bak
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cat > /etc/qemu-ifup <<EOF
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#!/bin/sh
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echo "Executing /etc/qemu-ifup"
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echo "Bringing up \$1 for bridged mode..."
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sudo /usr/bin/ip link set \$1 up promisc on
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echo "Adding \$1 to $BRIDGE..."
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sudo /usr/bin/brctl addif $BRIDGE \$1
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sleep 2
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EOF
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cat > /etc/qemu-ifdown <<EOF
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#!/bin/sh
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echo "Executing /etc/qemu-ifdown"
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sudo /usr/bin/ip link set \$1 down
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sudo /usr/bin/brctl delif $BRIDGE \$1
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sudo /usr/bin/ip link delete dev \$1
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EOF
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chmod 750 /etc/qemu-ifdown /etc/qemu-ifup
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chown root:kvm /etc/qemu-ifup /etc/qemu-ifdown
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IPFW=$( sysctl net.ipv4.ip_forward | cut -d= -f2 )
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sysctl net.ipv4.ip_forward=1
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ROUTES=$( ip r | grep $IFACE )
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BRROUT=$( echo "$ROUTES" | sed "s=$IFACE=$BRIDGE=" )
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brctl addbr $BRIDGE
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brctl addif $BRIDGE $IFACE
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ip l set up dev $BRIDGE
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ip r flush dev $IFACE
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ip a a $IP dev $BRIDGE
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echo "$BRROUT" | tac | while read l; do ip r a $l; done
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precreationg=$(ip tuntap list | cut -d: -f1 | sort)
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ip tuntap add user $USER mode tap
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postcreation=$(ip tuntap list | cut -d: -f1 | sort)
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TAPIF=$(comm -13 <(echo "$precreationg") <(echo "$postcreation"))
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[[ "$MAC" == "" ]] && printf -v MAC "52:54:%02x:%02x:%02x:%02x" \
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$(( $RANDOM & 0xff)) $(( $RANDOM & 0xff )) $(( $RANDOM & 0xff)) $(( $RANDOM & 0xff ))
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NET_ARGS="-net nic,macaddr=$MAC -net tap,ifname=$TAPIF"
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}
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# prepare the image
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SECTOR1=$( fdisk -l $IMG | grep FAT32 | awk '{ print $2 }' )
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SECTOR2=$( fdisk -l $IMG | grep Linux | awk '{ print $2 }' )
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OFFSET1=$(( SECTOR1 * 512 ))
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OFFSET2=$(( SECTOR2 * 512 ))
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mkdir -p tmpmnt
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mount $IMG -o offset=$OFFSET1 tmpmnt
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touch tmpmnt/ssh # this enables ssh
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umount tmpmnt
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mount $IMG -o offset=$OFFSET2 tmpmnt
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cat > tmpmnt/etc/udev/rules.d/90-qemu.rules <<EOF
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KERNEL=="sda", SYMLINK+="mmcblk0"
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KERNEL=="sda?", SYMLINK+="mmcblk0p%n"
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KERNEL=="sda2", SYMLINK+="root"
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EOF
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umount -l tmpmnt
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rmdir tmpmnt &>/dev/null
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# do it
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qemu-system-arm -kernel $KERNEL -cpu arm1176 -m 256 -M versatilepb $NET_ARGS \
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-no-reboot -append "root=/dev/sda2 panic=1" -drive format=raw,file=$IMG \
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# restore network to what it was
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[[ "$NO_NETWORK" != "1" ]] && {
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ip l set down dev $TAPIF
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ip tuntap del $TAPIF mode tap
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sysctl net.ipv4.ip_forward="$IPFW"
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ip l set down dev $BRIDGE
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brctl delbr $BRIDGE
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echo "$ROUTES" | tac | while read l; do ip r a $l; done
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}
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# License
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#
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# This script is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This script is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this script; if not, write to the
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# Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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# Boston, MA 02111-1307 USA
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