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Separate fuzzing and harness in fuzzpuzz

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There's now a function, fuzz_one(), that processes a single save file,
and main() arranges to call this a suitable number of times depending
on whether we're in AFL persistent mode or not.  This makes things a
bit cleaner, and will probably make adding good support for other
fuzzers, or just switching entirely to the horrible but popular
libFuzzer interface, simpler.
This commit is contained in:
Ben Harris
2023-02-16 22:57:23 +00:00
parent ec4335e07f
commit 100cfd2e99
1 changed files with 51 additions and 37 deletions
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92
fuzzpuzz.c
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@ -23,6 +23,44 @@
__AFL_FUZZ_INIT();
#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;
@ -32,6 +70,13 @@ static bool savefile_read(void *wctx, void *buf, int len)
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;
@ -39,17 +84,11 @@ static void savefile_write(void *wctx, const void *buf, int len)
fwrite(buf, 1, len, fp);
}
static drawing_api drapi = { NULL };
int main(int argc, char **argv)
{
const char *err;
char *gamename;
int i, ret = -1;
const game *ourgame = NULL;
midend *me;
int ret = -1;
FILE *in = NULL;
int w, h;
if (argc != 1) {
fprintf(stderr, "usage: %s\n", argv[0]);
@ -79,39 +118,14 @@ int main(int argc, char **argv)
in = stdin;
while (ret == -1) {
#endif
err = identify_game(&gamename, savefile_read, in);
if (err != NULL) {
fprintf(stderr, "%s\n", err);
ret = 1;
continue;
}
for (i = 0; i < gamecount; i++)
if (strcmp(gamename, gamelist[i]->name) == 0)
ourgame = gamelist[i];
sfree(gamename);
if (ourgame == NULL) {
fprintf(stderr, "Game not recognised\n");
ret = 1;
continue;
}
me = midend_new(NULL, ourgame, &drapi, NULL);
rewind(in);
err = midend_deserialise(me, savefile_read, in);
if (err != NULL) {
fprintf(stderr, "%s\n", err);
ret = 1;
midend_free(me);
continue;
}
w = h = INT_MAX;
midend_size(me, &w, &h, false, 1);
midend_redraw(me);
midend_serialise(me, savefile_write, stdout);
midend_free(me);
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;
}