1 /*===- StandaloneFuzzTargetMain.c - standalone main() for fuzz targets. ---===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 // This main() function can be linked to a fuzz target (i.e. a library
9 // that exports LLVMFuzzerTestOneInput() and possibly LLVMFuzzerInitialize())
10 // instead of libFuzzer. This main() function will not perform any fuzzing
11 // but will simply feed all input files one by one to the fuzz target.
12 //
13 // Use this file to provide reproducers for bugs when linking against libFuzzer
14 // or other fuzzing engine is undesirable.
15 //===----------------------------------------------------------------------===*/
16 #include <assert.h>
17 #include <stdio.h>
18 #include <stdlib.h>
19 
20 extern int LLVMFuzzerTestOneInput(const unsigned char *data, size_t size);
21 __attribute__((weak)) extern int LLVMFuzzerInitialize(int *argc, char ***argv);
22 int main(int argc, char **argv) {
23   fprintf(stderr, "StandaloneFuzzTargetMain: running %d inputs\n", argc - 1);
24   if (LLVMFuzzerInitialize)
25     LLVMFuzzerInitialize(&argc, &argv);
26   for (int i = 1; i < argc; i++) {
27     fprintf(stderr, "Running: %s\n", argv[i]);
28     FILE *f = fopen(argv[i], "r");
29     assert(f);
30     fseek(f, 0, SEEK_END);
31     size_t len = ftell(f);
32     fseek(f, 0, SEEK_SET);
33     unsigned char *buf = (unsigned char*)malloc(len);
34     size_t n_read = fread(buf, 1, len, f);
35     fclose(f);
36     assert(n_read == len);
37     LLVMFuzzerTestOneInput(buf, len);
38     free(buf);
39     fprintf(stderr, "Done:    %s: (%zd bytes)\n", argv[i], n_read);
40   }
41 }
42