#!/usr/bin/env bash
# SPDX-License-Identifier: LGPL-2.1-or-later

set -ex

export LC_CTYPE=C.UTF-8

export CC=${CC:-clang}
export CXX=${CXX:-clang++}
clang_version="$($CC --version | sed -nr 's/.*version ([^ ]+?) .*/\1/p' | sed -r 's/-$//')"

SANITIZER=${SANITIZER:-address -fsanitize-address-use-after-scope}
flags="-O1 -fno-omit-frame-pointer -gline-tables-only -DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION -fsanitize=$SANITIZER"

clang_lib="/usr/lib64/clang/${clang_version}/lib/linux"
[ -d "$clang_lib" ] || clang_lib="/usr/lib/clang/${clang_version}/lib/linux"

export CFLAGS=${CFLAGS:-$flags}
export CXXFLAGS=${CXXFLAGS:-$flags}
export LDFLAGS=${LDFLAGS:--L${clang_lib}}

export WORK=${WORK:-$(pwd)}
export OUT=${OUT:-$(pwd)/out}
mkdir -p $OUT

build=$WORK/build
rm -rf $build
mkdir -p $build

if [ -z "$FUZZING_ENGINE" ]; then
    fuzzflag="llvm-fuzz=true"
else
    fuzzflag="oss-fuzz=true"
    if [[ "$SANITIZER" == undefined ]]; then
        UBSAN_FLAGS="-fsanitize=pointer-overflow -fno-sanitize-recover=pointer-overflow"
        CFLAGS="$CFLAGS $UBSAN_FLAGS"
        CXXFLAGS="$CXXFLAGS $UBSAN_FLAGS"
    fi
fi

if ! meson $build -D$fuzzflag -Db_lundef=false; then
    cat $build/meson-logs/meson-log.txt
    exit 1
fi

ninja -v -C $build fuzzers

# The seed corpus is a separate flat archive for each fuzzer,
# with a fixed name ${fuzzer}_seed_corpus.zip.
for d in "$(dirname "$0")/../test/fuzz/fuzz-"*; do
    zip -jqr $OUT/$(basename "$d")_seed_corpus.zip "$d"
done

# get fuzz-dns-packet corpus
df=$build/dns-fuzzing
git clone --depth 1 https://github.com/CZ-NIC/dns-fuzzing $df
zip -jqr $OUT/fuzz-dns-packet_seed_corpus.zip $df/packet

install -Dt $OUT/src/shared/ $build/src/shared/libsystemd-shared-*.so

wget -O $OUT/fuzz-json.dict https://raw.githubusercontent.com/rc0r/afl-fuzz/master/dictionaries/json.dict

find $build -maxdepth 1 -type f -executable -name "fuzz-*" -exec mv {} $OUT \;
find src -type f -name "fuzz-*.dict" -exec cp {} $OUT \;
cp src/fuzz/*.options $OUT