tests: New style fuzzing tool for JSON parser

This is a newer version of tests/test-json tool.

Signed-off-by: Jouni Malinen <j@w1.fi>

tests/fuzzing/json/Makefile

@@ -0,0 +1,19 @@
+all: json
+include ../rules.include
+
+OBJS += $(SRC)/utils/base64.o
+OBJS += $(SRC)/utils/common.o
+OBJS += $(SRC)/utils/json.o
+OBJS += $(SRC)/utils/os_unix.o
+OBJS += $(SRC)/utils/wpa_debug.o
+OBJS += $(SRC)/utils/wpabuf.o
+
+json: json.o $(OBJS) $(LIBS)
+	$(LDO) $(LDFLAGS) -o $@ $^ $(LIBS) $(ELIBS)
+
+clean:
+	$(MAKE) -C $(SRC) clean
+	$(MAKE) -C $(WPAS_SRC) clean
+	rm -f json *~ *.o *.d ../*~ ../*.o ../*.d
+
+-include $(OBJS:%.o=%.d)

tests/fuzzing/json/corpus/1.json

@@ -0,0 +1 @@
+{"a":[[]],"b":1,"c":"q","d":{"e":[{}]}}

tests/fuzzing/json/corpus/2.json

@@ -0,0 +1 @@
+{}

tests/fuzzing/json/corpus/3.json

@@ -0,0 +1 @@
+0

tests/fuzzing/json/json.c

@@ -0,0 +1,38 @@
+/*
+ * JSON parser - test program
+ * Copyright (c) 2019, Jouni Malinen <j@w1.fi>
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#include "utils/includes.h"
+#include "utils/common.h"
+#include "utils/json.h"
+#include "../fuzzer-common.h"
+
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+	struct json_token *root;
+	char *txt;
+	size_t buflen = 10000;
+
+	wpa_fuzzer_set_debug_level();
+
+	root = json_parse((const char *) data, size);
+	if (!root) {
+		wpa_printf(MSG_DEBUG, "JSON parsing failed");
+		return 0;
+	}
+
+	txt = os_zalloc(buflen);
+	if (txt) {
+		json_print_tree(root, txt, buflen);
+		wpa_printf(MSG_DEBUG, "%s", txt);
+		os_free(txt);
+	}
+	json_free(root);
+
+	return 0;
+}