[test suite] add AFL wrapper for fuzzing digest cache file format

test/afl/fuzzing-wrappers/helpers/fwknopd-digest-cache.sh

@@ -0,0 +1,16 @@
+#!/bin/sh -x
+
+DIGEST_FILE="./test-cases/server-digest-cache/digest.cache"
+
+if [ $@ ]
+then
+    DIGEST_FILE=$@
+fi
+
+LD_LIBRARY_PATH=../../lib/.libs ../../server/.libs/fwknopd \
+    -c ../conf/ipt_snat_fwknopd.conf \
+    -a ../conf/default_access.conf \
+    -d $DIGEST_FILE \
+    -f -t --exit-parse-config -v -v -v -r `pwd`/run
+
+exit $?

test/afl/fuzzing-wrappers/server-digest-cache.sh

@@ -0,0 +1,41 @@
+#!/bin/sh -x
+
+#
+# Fuzz the fwknopd digest tracking file
+#
+
+. ./fuzzing-wrappers/fcns
+
+FDIR="server-digest-cache.out"
+OUT_DIR="$TOP_DIR/$FDIR"
+PREV_OUT_DIR=''
+IN_DIR="test-cases/server-digest-cache"
+
+### build up our afl-fuzz text banner
+TSTR="fwknopd,digest.cache"
+GIT_STR=''
+git_banner GIT_STR
+BANNER="$TSTR$GIT_STR"
+
+### set up directories
+dir_init $ARCHIVE_DIR $FDIR $OUT_DIR PREV_OUT_DIR
+
+### make sure that parsing the access.conf file works
+./fuzzing-wrappers/helpers/fwknopd-digest-cache.sh || exit $?
+
+### support resuming from a previous run
+if [ $@ ] && [ "$1" = "resume" ]
+then
+    IN_DIR=$PREV_OUT_DIR
+fi
+
+### run afl-fuzz
+LD_LIBRARY_PATH=$LIB_DIR afl-fuzz \
+    -T $BANNER -t 1000 -i $IN_DIR \
+    -o $OUT_DIR -f $OUT_DIR/afl_digest_cache.conf $SERVER \
+    -c ../conf/ipt_snat_fwknopd.conf \
+    -a ../conf/default_access.conf \
+    -d $OUT_DIR/afl_digest_cache.conf \
+    -f -t --exit-parse-config -r `pwd`/run
+
+exit $?