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/*
* Copyright 2020 Google 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.
*/
#ifndef LIBGAV1_TESTS_FUZZER_FUZZER_TEMP_FILE_H_
#define LIBGAV1_TESTS_FUZZER_FUZZER_TEMP_FILE_H_
// Adapter utility from fuzzer input to a temporary file, for fuzzing APIs that
// require a file instead of an input buffer.
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
// Pure-C interface for creating and cleaning up temporary files.
static char* fuzzer_get_tmpfile_with_suffix(const uint8_t* data, size_t size,
const char* suffix) {
if (suffix == NULL) { // NOLINT (this could be a C compilation unit)
suffix = "";
}
const size_t suffix_len = strlen(suffix);
if (suffix_len > INT_MAX) { // mkstemps takes int for suffixlen param
perror("Suffix too long");
abort();
}
#ifdef __ANDROID__
const char* leading_temp_path =
"/data/local/tmp/generate_temporary_file.XXXXXX";
#else
const char* leading_temp_path = "/tmp/generate_temporary_file.XXXXXX";
#endif
const size_t buffer_sz = strlen(leading_temp_path) + suffix_len + 1;
char* filename_buffer =
(char*)malloc(buffer_sz); // NOLINT (this could be a C compilation unit)
if (!filename_buffer) {
perror("Failed to allocate file name buffer.");
abort();
}
if (snprintf(filename_buffer, buffer_sz, "%s%s", leading_temp_path, suffix) >=
buffer_sz) {
perror("File name buffer too short.");
abort();
}
const int file_descriptor = mkstemps(filename_buffer, suffix_len);
if (file_descriptor < 0) {
perror("Failed to make temporary file.");
abort();
}
FILE* file = fdopen(file_descriptor, "wb");
if (!file) {
perror("Failed to open file descriptor.");
close(file_descriptor);
abort();
}
const size_t bytes_written = fwrite(data, sizeof(uint8_t), size, file);
if (bytes_written < size) {
close(file_descriptor);
fprintf(stderr, "Failed to write all bytes to file (%zu out of %zu)",
bytes_written, size);
abort();
}
fclose(file);
return filename_buffer;
}
static char* fuzzer_get_tmpfile(
const uint8_t* data,
size_t size) { // NOLINT (people include this .inc file directly)
return fuzzer_get_tmpfile_with_suffix(data, size, NULL); // NOLINT
}
static void fuzzer_release_tmpfile(char* filename) {
if (unlink(filename) != 0) {
perror("WARNING: Failed to delete temporary file.");
}
free(filename);
}
// C++ RAII object for creating temporary files.
#ifdef __cplusplus
class FuzzerTemporaryFile {
public:
FuzzerTemporaryFile(const uint8_t* data, size_t size)
: original_filename_(fuzzer_get_tmpfile(data, size)) {
filename_ = strdup(original_filename_);
if (!filename_) {
perror("Failed to allocate file name copy.");
abort();
}
}
FuzzerTemporaryFile(const uint8_t* data, size_t size, const char* suffix)
: original_filename_(fuzzer_get_tmpfile_with_suffix(data, size, suffix)) {
filename_ = strdup(original_filename_);
if (!filename_) {
perror("Failed to allocate file name copy.");
abort();
}
}
~FuzzerTemporaryFile() {
free(filename_);
fuzzer_release_tmpfile(original_filename_);
}
FuzzerTemporaryFile(const FuzzerTemporaryFile& other) = delete;
FuzzerTemporaryFile operator=(const FuzzerTemporaryFile& other) = delete;
FuzzerTemporaryFile(const FuzzerTemporaryFile&& other) = delete;
FuzzerTemporaryFile operator=(const FuzzerTemporaryFile&& other) = delete;
const char* filename() const { return filename_; }
// Returns a mutable pointer to the file name. Should be used sparingly, only
// in case the fuzzed API demands it or when making a mutable copy is
// inconvenient (e.g., in auto-generated code).
char* mutable_filename() const { return filename_; }
private:
char* original_filename_;
// A mutable copy of the original filename, returned by the accessor. This
// guarantees that the original filename can always be used to release the
// temporary path.
char* filename_;
};
#endif // __cplusplus
#endif // LIBGAV1_TESTS_FUZZER_FUZZER_TEMP_FILE_H_
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