158 lines
3.3 KiB
Bash
Executable File
158 lines
3.3 KiB
Bash
Executable File
#!/bin/sh
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if test $(uci get autoupdater.settings.enabled) != 1; then
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echo "autoupdater is disabled"
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exit 0
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fi
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BRANCH=$(uci get autoupdater.settings.branch)
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PROBABILITY=$(uci get autoupdater.${BRANCH}.probability)
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if test "a$1" != "a-f"; then
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# get one random byte from /dev/urandom, convert it to decimal and check
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# against update_probability*255
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hexdump -n1 -e '/1 "%d"' /dev/urandom | awk "{exit \$1 > $PROBABILITY * 255}"
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if test $? -ne 0; then
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echo "No autoupdate this time. Use -f to override"
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exit 0
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fi
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fi
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BASE=$(uci get autoupdater.${BRANCH}.url)
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PUBKEYS=$(uci get autoupdater.${BRANCH}.pubkey)
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GOOD_SIGNATURES=$(uci get autoupdater.${BRANCH}.good_signatures)
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VERSION_FILE=/lib/gluon/release
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newer_than() {
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local old="$(printf '%s\n%s\n' "$1" "$2" | sort -n | head -n 1)"
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test "$1" != "$old"
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}
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cleanup() {
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rm -f $manifest
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rm -f $fw_image
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rm -f $manifest_upper
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rm -f $manifest_lower
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}
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trap cleanup INT TERM EXIT PIPE
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. /lib/gluon/functions/model.sh
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my_model="$(get_model | tr '[A-Z]' '[a-z]' | sed -r 's/[^a-z0-9]+/-/g;s/-$//')"
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if [ ! -f "$VERSION_FILE" ]; then
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echo "Couldn't determine firmware version!" >&2
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exit 1
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fi
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my_version="$(cat "$VERSION_FILE")"
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fetch_manifest() {
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local MIRROR=$1
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wget -O$manifest "$MIRROR"/manifest
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if test $? -ne 0; then
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echo "Couldn't fetch manifest from $MIRROR" >&2
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return 1
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fi
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}
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verify_and_analyse_manifest() {
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awk "BEGIN { sep=0 }
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/^---\$/ { sep=1; next }
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{ if(sep==0) print > \"$manifest_upper\";
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else print > \"$manifest_lower\"}" \
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$manifest
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local signatures=""
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while read sig; do
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echo "$sig" | grep -q "^[0-9a-f]\{128\}$"
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if test $? -ne 0; then
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continue
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fi
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signatures="$signatures -s $sig"
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done < $manifest_lower
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local pubkeys=""
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for key in $PUBKEYS; do
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pubkeys="$pubkeys -p $key"
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done
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ecdsaverify -n $GOOD_SIGNATURES $pubkeys $signatures $manifest_upper
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if test $? -ne 0; then
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echo "Not enough valid signatures!" >&2
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return 1
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fi
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grep -q "^BRANCH=${BRANCH}$" $manifest_upper
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if test $? -ne 0; then
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echo "Wrong branch. We are on ${BRANCH}" >&2
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return 1
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fi
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local my_firmware=$(grep "^${my_model} " $manifest_upper)
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if test $? -ne 0; then
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echo "No matching firmware found (model ${my_model})" >&2
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return 1
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fi
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fw_version=$(echo "${my_firmware}"|cut -d' ' -f2)
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fw_md5=$(echo "${my_firmware}"|cut -d' ' -f3)
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fw_file=$(echo "${my_firmware}"|cut -d' ' -f4)
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return 0
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}
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fetch_firmware() {
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local MIRROR=$1
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wget -O$fw_image "${MIRROR}/${fw_file}"
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if test $? -ne 0; then
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echo "Error downloading image from $MIRROR" >&2
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return 1
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else
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return 0
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fi
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}
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autoupdate() {
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local MIRROR=$1
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fw_image=$(mktemp)
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manifest=$(mktemp)
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manifest_upper=$(mktemp)
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manifest_lower=$(mktemp)
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fetch_manifest $MIRROR || return 1
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verify_and_analyse_manifest || return 1
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if newer_than "$fw_version" "$my_version"; then
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echo "New version available"
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fetch_firmware $MIRROR || return 1
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image_md5=$(md5sum "$fw_image"|cut -b-32)
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if test "$image_md5" != "$fw_md5"; then
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echo "Invalid image checksum" >&2
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return 1
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fi
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echo "Upgrading firmware."
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sysupgrade "${fw_image}"
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else
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echo "No new firmware available"
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fi
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return 0
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}
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autoupdate $BASE && exit 0
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