tests: internal: fuzzers: add fstore fuzzer (#6465)

Signed-off-by: David Korczynski <[email protected]>

tests/internal/fuzzers/CMakeLists.txt

@@ -12,6 +12,7 @@ set(UNIT_TESTS_FILES
   flb_json_fuzzer.c
   flb_mp_fuzzer.c
   filter_stdout_fuzzer.c
+  fstore_fuzzer.c
   parser_fuzzer.c
   parse_json_fuzzer.c
   parse_logfmt_fuzzer.c

tests/internal/fuzzers/fstore_fuzzer.c

@@ -0,0 +1,69 @@
+/*  Fluent Bit
+ *  ==========
+ *  Copyright (C) 2019-2022 The Fluent Bit Authors
+ *  Copyright (C) 2015-2018 Treasure Data Inc.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#include <fluent-bit/flb_info.h>
+#include <fluent-bit/flb_fstore.h>
+#include <fluent-bit/flb_mem.h>
+#include <fluent-bit/flb_compat.h>
+
+#include <chunkio/chunkio.h>
+#include <chunkio/cio_utils.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+
+#define FSF_STORE_PATH "/tmp/flb-fstore"
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+    int ret;
+    void *out_buf;
+    size_t out_size;
+    struct stat st_data;
+    struct flb_fstore *fs;
+    struct flb_fstore_stream *st;
+    struct flb_fstore_file *fsf;
+
+    cio_utils_recursive_delete(FSF_STORE_PATH);
+    fs = flb_fstore_create(FSF_STORE_PATH, FLB_FSTORE_FS);
+    st = flb_fstore_stream_create(fs, "abc");
+    if (st != NULL) {
+        fsf = flb_fstore_file_create(fs, st, "example.txt", size);
+
+        if (fsf != NULL) {
+            ret = flb_fstore_file_append(fsf, data, size);
+            if (ret == 0) {
+                ret = flb_fstore_file_content_copy(fs, fsf, &out_buf, &out_size);
+                if (ret == 0) {
+                    assert(memcmp(out_buf, data, size) == 0);
+                }
+                flb_free(out_buf);
+            }
+        }
+    }
+
+    flb_fstore_dump(fs);
+    flb_fstore_destroy(fs);
+    return 0;
+}