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/*
* libgit2 raw packfile fuzz target.
*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "git2.h"
#include "git2/sys/transport.h"
#include "futils.h"
#include "standalone_driver.h"
#define UNUSED(x) (void)(x)
struct fuzzer_buffer {
const unsigned char *data;
size_t size;
};
struct fuzzer_stream {
git_smart_subtransport_stream base;
const unsigned char *readp;
const unsigned char *endp;
};
struct fuzzer_subtransport {
git_smart_subtransport base;
git_transport *owner;
struct fuzzer_buffer data;
};
static git_repository *repo;
static int fuzzer_stream_read(git_smart_subtransport_stream *stream,
char *buffer,
size_t buf_size,
size_t *bytes_read)
{
struct fuzzer_stream *fs = (struct fuzzer_stream *) stream;
size_t avail = fs->endp - fs->readp;
*bytes_read = (buf_size > avail) ? avail : buf_size;
memcpy(buffer, fs->readp, *bytes_read);
fs->readp += *bytes_read;
return 0;
}
static int fuzzer_stream_write(git_smart_subtransport_stream *stream,
const char *buffer, size_t len)
{
UNUSED(stream);
UNUSED(buffer);
UNUSED(len);
return 0;
}
static void fuzzer_stream_free(git_smart_subtransport_stream *stream)
{
free(stream);
}
static int fuzzer_stream_new(
struct fuzzer_stream **out,
const struct fuzzer_buffer *data)
{
struct fuzzer_stream *stream = malloc(sizeof(*stream));
if (!stream)
return -1;
stream->readp = data->data;
stream->endp = data->data + data->size;
stream->base.read = fuzzer_stream_read;
stream->base.write = fuzzer_stream_write;
stream->base.free = fuzzer_stream_free;
*out = stream;
return 0;
}
static int fuzzer_subtransport_action(
git_smart_subtransport_stream **out,
git_smart_subtransport *transport,
const char *url,
git_smart_service_t action)
{
struct fuzzer_subtransport *ft = (struct fuzzer_subtransport *) transport;
UNUSED(url);
UNUSED(action);
return fuzzer_stream_new((struct fuzzer_stream **) out, &ft->data);
}
static int fuzzer_subtransport_close(git_smart_subtransport *transport)
{
UNUSED(transport);
return 0;
}
static void fuzzer_subtransport_free(git_smart_subtransport *transport)
{
free(transport);
}
static int fuzzer_subtransport_new(
struct fuzzer_subtransport **out,
git_transport *owner,
const struct fuzzer_buffer *data)
{
struct fuzzer_subtransport *sub = malloc(sizeof(*sub));
if (!sub)
return -1;
sub->owner = owner;
sub->data.data = data->data;
sub->data.size = data->size;
sub->base.action = fuzzer_subtransport_action;
sub->base.close = fuzzer_subtransport_close;
sub->base.free = fuzzer_subtransport_free;
*out = sub;
return 0;
}
int fuzzer_subtransport_cb(
git_smart_subtransport **out,
git_transport *owner,
void *payload)
{
struct fuzzer_buffer *buf = (struct fuzzer_buffer *) payload;
struct fuzzer_subtransport *sub;
if (fuzzer_subtransport_new(&sub, owner, buf) < 0)
return -1;
*out = &sub->base;
return 0;
}
int fuzzer_transport_cb(git_transport **out, git_remote *owner, void *param)
{
git_smart_subtransport_definition def = {
fuzzer_subtransport_cb,
1,
param
};
return git_transport_smart(out, owner, &def);
}
void fuzzer_git_abort(const char *op)
{
const git_error *err = git_error_last();
fprintf(stderr, "unexpected libgit error: %s: %s\n",
op, err ? err->message : "<none>");
abort();
}
int LLVMFuzzerInitialize(int *argc, char ***argv)
{
#if defined(_WIN32)
char tmpdir[MAX_PATH], path[MAX_PATH];
if (GetTempPath((DWORD)sizeof(tmpdir), tmpdir) == 0)
abort();
if (GetTempFileName(tmpdir, "lg2", 1, path) == 0)
abort();
if (git_futils_mkdir(path, 0700, 0) < 0)
abort();
#else
char path[] = "/tmp/git2.XXXXXX";
if (mkdtemp(path) != path)
abort();
#endif
if (git_libgit2_init() < 0)
abort();
if (git_libgit2_opts(GIT_OPT_SET_PACK_MAX_OBJECTS, 10000000) < 0)
abort();
UNUSED(argc);
UNUSED(argv);
if (git_repository_init(&repo, path, 1) < 0)
fuzzer_git_abort("git_repository_init");
return 0;
}
int LLVMFuzzerTestOneInput(const unsigned char *data, size_t size)
{
struct fuzzer_buffer buffer = { data, size };
git_remote_callbacks callbacks = GIT_REMOTE_CALLBACKS_INIT;
git_remote *remote;
if (git_remote_create_anonymous(&remote, repo, "fuzzer://remote-url") < 0)
fuzzer_git_abort("git_remote_create");
callbacks.transport = fuzzer_transport_cb;
callbacks.payload = &buffer;
if (git_remote_connect(remote, GIT_DIRECTION_FETCH,
&callbacks, NULL, NULL) < 0)
goto out;
git_remote_download(remote, NULL, NULL);
out:
git_remote_free(remote);
return 0;
}
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