ref: 795ccf60023fd76893345c8ef6cefd535004a240
dir: /fuzzpuzz.c/
/* * fuzzpuzz.c: Fuzzing frontend to all puzzles. */ /* * The idea here is that this front-end supports all back-ends and can * feed them save files. It then asks the back-end to draw the puzzle * (through a null drawing API) and reserialises the state. This * tests the deserialiser, the code for loading game descriptions, the * processing of move strings, the redraw code, and the serialisation * routines, but is still pretty quick. * * To use AFL++ to drive fuzzpuzz, you can do something like: * * CC=afl-cc cmake -B build-afl * cmake --build build-afl --target fuzzpuzz * mkdir fuzz-in && ln icons/''*.sav fuzz-in * afl-fuzz -i fuzz-in -o fuzz-out -x fuzzpuzz.dict -- build-afl/fuzzpuzz * * Similarly with Honggfuzz: * * CC=hfuzz-cc cmake -B build-honggfuzz * cmake --build build-honggfuzz --target fuzzpuzz * mkdir fuzz-corpus && ln icons/''*.sav fuzz-corpus * honggfuzz -s -i fuzz-corpus -w fuzzpuzz.dict -- build-honggfuzz/fuzzpuzz */ #include <stdbool.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #ifdef __AFL_FUZZ_TESTCASE_LEN # include <unistd.h> /* read() is used by __AFL_FUZZ_TESTCASE_LEN. */ #endif #include "puzzles.h" #ifdef __AFL_FUZZ_INIT __AFL_FUZZ_INIT(); #endif #ifdef HAVE_HF_ITER extern int HF_ITER(unsigned char **, size_t *); #endif static const char *fuzz_one(bool (*readfn)(void *, void *, int), void *rctx, void (*rewindfn)(void *), void (*writefn)(void *, const void *, int), void *wctx) { const char *err; char *gamename; int i, w, h; const game *ourgame = NULL; static const drawing_api drapi = { NULL }; midend *me; err = identify_game(&gamename, readfn, rctx); if (err != NULL) return err; for (i = 0; i < gamecount; i++) if (strcmp(gamename, gamelist[i]->name) == 0) ourgame = gamelist[i]; sfree(gamename); if (ourgame == NULL) return "Game not recognised"; me = midend_new(NULL, ourgame, &drapi, NULL); rewindfn(rctx); err = midend_deserialise(me, readfn, rctx); if (err != NULL) { midend_free(me); return err; } w = h = INT_MAX; midend_size(me, &w, &h, false, 1); midend_redraw(me); midend_serialise(me, writefn, wctx); midend_free(me); return NULL; } static bool savefile_read(void *wctx, void *buf, int len) { FILE *fp = (FILE *)wctx; int ret; ret = fread(buf, 1, len, fp); return (ret == len); } static void savefile_rewind(void *wctx) { FILE *fp = (FILE *)wctx; rewind(fp); } static void savefile_write(void *wctx, const void *buf, int len) { FILE *fp = (FILE *)wctx; fwrite(buf, 1, len, fp); } int main(int argc, char **argv) { const char *err; int ret = -1; FILE *in = NULL; if (argc != 1) { fprintf(stderr, "usage: %s\n", argv[0]); exit(1); } #ifdef __AFL_HAVE_MANUAL_CONTROL __AFL_INIT(); #endif #ifdef __AFL_FUZZ_TESTCASE_LEN /* * AFL persistent mode, where we fuzz from a RAM buffer provided * by AFL in a loop. This version can still be run standalone if * necessary, for instance to diagnose a crash. */ while (__AFL_LOOP(10000)) { if (in != NULL) fclose(in); in = fmemopen(__AFL_FUZZ_TESTCASE_BUF, __AFL_FUZZ_TESTCASE_LEN, "r"); if (in == NULL) { fprintf(stderr, "fmemopen failed"); ret = 1; continue; } #elif defined(HAVE_HF_ITER) /* * Honggfuzz persistent mode. Unlike AFL persistent mode, the * resulting executable cannot be run outside of Honggfuzz. */ while (true) { unsigned char *testcase_buf; size_t testcase_len; if (in != NULL) fclose(in); HF_ITER(&testcase_buf, &testcase_len); in = fmemopen(testcase_buf, testcase_len, "r"); if (in == NULL) { fprintf(stderr, "fmemopen failed"); ret = 1; continue; } #else in = stdin; while (ret == -1) { #endif err = fuzz_one(savefile_read, in, savefile_rewind, savefile_write, stdout); if (err == NULL) { ret = 0; } else { fprintf(stderr, "%s\n", err); ret = 1; } } return ret; }