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#!/bin/sh
# ============LICENSE_START=======================================================
# org.onap.vvp/image-scanner
# ===================================================================
# Copyright © 2017 AT&T Intellectual Property. All rights reserved.
# ===================================================================
#
# Unless otherwise specified, all software contained herein is licensed
# under the Apache License, Version 2.0 (the “License”);
# you may not use this software except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
#
#
# Unless otherwise specified, all documentation contained herein is licensed
# under the Creative Commons License, Attribution 4.0 Intl. (the “License”);
# you may not use this documentation except in compliance with the License.
# You may obtain a copy of the License at
#
# https://creativecommons.org/licenses/by/4.0/
#
# Unless required by applicable law or agreed to in writing, documentation
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# ============LICENSE_END============================================
#
# ECOMP is a trademark and service mark of AT&T Intellectual Property.
#
set -e
usage() {
cat <<-EOF
Usage: $0 DISK_IMAGE
Mount DISK_IMAGE and scan it, optionally decompressing first.
DISK_IMAGE must be a qcow or raw disk image.
GZip-compressed images will be decompressed in-place.
Environment variable IMAGESCANNER_MOUNTPOINT controls where the image
will be mounted while scan is in progress.
EOF
}
scan_image_dir() {
clamscan -r "$1"
return $?
}
image="$1"
[ "$IMAGESCANNER_MOUNTPOINT" ] || export IMAGESCANNER_MOUNTPOINT="/mnt/imagescanner"
[ -d "$IMAGESCANNER_MOUNTPOINT" ] || mkdir -p "$IMAGESCANNER_MOUNTPOINT"
[ -e "$image" ] || {
echo "Error: image not found: $image"
exit 1
}
if [ "${image##*.}" = "gz" ]; then
echo "Decompressing image $image..."
gunzip "$image"
image="${image%.gz}"
fi
# Hueristic for determining image type:
# 1. ask "file"
# 2. failing that, check file extension
echo "Detecting image type for $image..."
detectedtype="$(file -b $image)"
case "$detectedtype" in
"QEMU QCOW Image"*) imagetype=qcow ;;
"ISO 9660 CD-ROM"*) imagetype=iso ;;
"DOS/MBR boot sector"*) imagetype=img ;; # "isohybrid" bootable CD / disk image
*) echo "Could not detect image type by inspection; guessing by extension..."
# unknown string from 'file'; try by extension
case "${image##*.}" in
"qcow"|"qcow2") imagetype=qcow ;;
"iso") imagetype=iso ;;
"img") imagetype=img ;;
*)
echo "Error: $image has unknown image type: $detectedtype"
exit 3
;;
esac
;;
esac
echo "Detected $detectedtype: $imagetype"
status=0
case "$imagetype" in
qcow)
echo "Processing qcow image $image..."
qemu-nbd -rc /dev/nbd0 "$image"
partitions=$(kpartx -ravs /dev/nbd0 | cut -d' ' -f3)
for partition in $partitions
do
[ -e "/dev/mapper/$partition" ] || continue # nullglob
echo "Mounting qcow partition $image/$partition..."
mount -o ro "/dev/mapper/$partition" "$IMAGESCANNER_MOUNTPOINT"
echo "Scanning mounted image..."
scan_image_dir "$IMAGESCANNER_MOUNTPOINT" || status=$?
echo "Unmounting..."
umount "$IMAGESCANNER_MOUNTPOINT"
done
echo "Disconnecting NBD device..."
dmsetup remove $partitions
kpartx -vd /dev/nbd0
qemu-nbd -d /dev/nbd0
;;
img)
echo "Processing raw image $image..."
partitions=$(kpartx -ravs $image | cut -d' ' -f3)
for partition in $partitions
do
[ -e "/dev/mapper/$partition" ] || continue # nullglob
echo "Mounting raw image partition $image/$partition..."
mount -o ro "/dev/mapper/$partition" "$IMAGESCANNER_MOUNTPOINT"
echo "Scanning mounted image..."
scan_image_dir "$IMAGESCANNER_MOUNTPOINT" || status=$?
echo "Unmounting..."
umount "$IMAGESCANNER_MOUNTPOINT"
done
echo "Disconnecting loopback device..."
# this is unnecessary on my host; why is it needed in a container?
dmsetup remove $partitions
kpartx -vd $image
;;
iso)
echo "Processing iso image $image..."
mount -o loop,ro "$image" "$IMAGESCANNER_MOUNTPOINT"
echo "Scanning mounted image..."
scan_image_dir "$IMAGESCANNER_MOUNTPOINT" || status=$?
echo "Unmounting..."
umount "$IMAGESCANNER_MOUNTPOINT"
;;
esac
echo "Done scanning $image."
if [ "$status" != "0" ]; then
echo "WARNING: A scan reported a failure result."
exit $status
fi
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