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#!/bin/bash
. lib.sh
#
# *** Description ***
#
# generate header with correct json of maximal size in primary slot.
# Secondary header is broken on purpose.
#
# $1 full target dir
# $2 full source luks2 image
PATTERN="\"config\":{"
KEY="\"config_key\":\""
function prepare()
{
cp $SRC_IMG $TGT_IMG
test -d $TMPDIR || mkdir $TMPDIR
read_luks2_json0 $TGT_IMG $TMPDIR/json0
read_luks2_bin_hdr0 $TGT_IMG $TMPDIR/hdr0
read_luks2_bin_hdr1 $TGT_IMG $TMPDIR/hdr1
}
function generate()
{
read -r json_str < $TMPDIR/json0
json_len=${#json_str}
pindex=$(strindex $json_str $PATTERN)
test $pindex -gt 0 || exit 2
offset=${#PATTERN}
offset=$((offset+pindex))
key_len=${#KEY}
remain=$((LUKS2_JSON_SIZE*512-json_len-key_len-2)) # -2: closing '"' and terminating '\0'
if [ ${json_str:offset:1} = "}" ]; then
format_str="%s%s%s"
else
format_str="%s%s,%s"
remain=$((remain-1)) # also count with separating ','
fi
test $remain -gt 0 || exit 2
fill=$(repeat_str "X" $remain)"\""
printf $format_str $KEY $fill ${json_str:$offset} | _dd of=$TMPDIR/json0 bs=1 seek=$offset conv=notrunc
merge_bin_hdr_with_json $TMPDIR/hdr0 $TMPDIR/json0 $TMPDIR/area0
erase_checksum $TMPDIR/area0
chks0=$(calc_sha256_checksum_file $TMPDIR/area0)
write_checksum $chks0 $TMPDIR/area0
write_luks2_hdr0 $TMPDIR/area0 $TGT_IMG
kill_bin_hdr $TMPDIR/hdr1
write_luks2_hdr1 $TMPDIR/hdr1 $TGT_IMG
}
function check()
{
read_luks2_bin_hdr1 $TGT_IMG $TMPDIR/hdr_res1
local str_res1=$(head -c 6 $TMPDIR/hdr_res1)
test "$str_res1" = "VACUUM" || exit 2
read_luks2_json0 $TGT_IMG $TMPDIR/json_res0
chks_res0=$(read_sha256_checksum $TGT_IMG)
test "$chks0" = "$chks_res0" || exit 2
#json_str_res0=$(< $TMPDIR/json_res0)
read -r json_str_res0 < $TMPDIR/json_res0
test ${#json_str_res0} -eq $((LUKS2_JSON_SIZE*512-1)) || exit 2
}
function cleanup()
{
rm -f $TMPDIR/*
rm -fd $TMPDIR
}
test $# -eq 2 || exit 1
TGT_IMG=$1/$(test_img_name $0)
SRC_IMG=$2
prepare
generate
check
cleanup
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