Add simple zscanner fuzzer

.gitmodules

 [submodule "tests-fuzz/packet_libfuzzer.in"]
 	path = tests-fuzz/packet_libfuzzer.in
 	url = ../fuzzing/packet_libfuzzer.in.git
+[submodule "tests-fuzz/zscanner_libfuzzer.in"]
+	path = tests-fuzz/zscanner_libfuzzer.in
+	url = ../fuzzing/zscanner_libfuzzer.in.git

Knot.files

@@ -491,6 +491,7 @@ tests-fuzz/wrap/afl-loop.h
 tests-fuzz/wrap/server.c
 tests-fuzz/wrap/tcp-handler.c
 tests-fuzz/wrap/udp-handler.c
+tests-fuzz/zscanner_libfuzzer.c
 tests/contrib/test_base32hex.c
 tests/contrib/test_base64.c
 tests/contrib/test_dynarray.c

tests-fuzz/.gitignore

@@ -7,3 +7,4 @@
 /*.trs
 /*.log
 /packet_libfuzzer
+/zscanner_libfuzzer

tests-fuzz/Makefile.am

@@ -8,17 +8,23 @@ AM_CPPFLAGS = \
 	-DSRCDIR=\"$(abs_srcdir)\"
 
 FUZZERS = \
-	packet_libfuzzer
+	packet_libfuzzer	\
+	zscanner_libfuzzer
 
 check_PROGRAMS = $(FUZZERS)
 
 packet_libfuzzer_SOURCES = packet_libfuzzer.c
 packet_libfuzzer_LDADD = $(top_builddir)/src/libknot.la
 
+zscanner_libfuzzer_SOURCES = zscanner_libfuzzer.c
+zscanner_libfuzzer_LDADD = $(top_builddir)/src/zscanner/libzscanner.la
+
 if SANITIZE_FUZZER
 packet_libfuzzer_LDFLAGS = -fsanitize=fuzzer
+zscanner_libfuzzer_LDFLAGS = -fsanitize=fuzzer
 else
 packet_libfuzzer_SOURCES += main.c
+zscanner_libfuzzer_SOURCES += main.c
 AM_CPPFLAGS += -DTEST_RUN
 TESTS = $(FUZZERS)
 endif

tests-fuzz/zscanner_libfuzzer.c

+/*  Copyright (C) 2017 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <assert.h>
+#include <stdint.h>
+
+#include "zscanner/scanner.h"
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+	zs_scanner_t s = { 0 };
+	assert(zs_init(&s, ".", 1, 0) == 0);
+	assert(zs_set_input_string(&s, (const char *)data, size) == 0);
+
+	zs_parse_all(&s);
+
+	zs_deinit(&s);
+	
+	return 0;
+}

zscanner_libfuzzer.in @ 91e31ee4

+Subproject commit 91e31ee437c5ca34cfe836187136cefa54f887db