82 lines
2.4 KiB
C++
82 lines
2.4 KiB
C++
// Copyright 2018 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Adapter utility from fuzzer input to a temporary file, for fuzzing APIs that
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// require a file instead of an input buffer.
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#ifndef FUZZER_TEMP_FILE_H_
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#define FUZZER_TEMP_FILE_H_
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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// Pure-C interface for creating and cleaning up temporary files.
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static char* fuzzer_get_tmpfile(const uint8_t* data, size_t size) {
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char* filename_buffer = strdup("/tmp/generate_temporary_file.XXXXXX");
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if (!filename_buffer) {
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perror("Failed to allocate file name buffer.");
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abort();
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}
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const int file_descriptor = mkstemp(filename_buffer);
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if (file_descriptor < 0) {
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perror("Failed to make temporary file.");
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abort();
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}
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FILE* file = fdopen(file_descriptor, "wb");
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if (!file) {
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perror("Failed to open file descriptor.");
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close(file_descriptor);
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abort();
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}
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const size_t bytes_written = fwrite(data, sizeof(uint8_t), size, file);
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if (bytes_written < size) {
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close(file_descriptor);
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fprintf(stderr, "Failed to write all bytes to file (%zu out of %zu)",
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bytes_written, size);
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abort();
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}
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fclose(file);
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return filename_buffer;
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}
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static void fuzzer_release_tmpfile(char* filename) {
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if (unlink(filename) != 0) {
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perror("WARNING: Failed to delete temporary file.");
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}
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free(filename);
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}
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// C++ RAII object for creating temporary files.
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#ifdef __cplusplus
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class FuzzerTemporaryFile {
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public:
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FuzzerTemporaryFile(const uint8_t* data, size_t size)
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: filename_(fuzzer_get_tmpfile(data, size)) {}
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~FuzzerTemporaryFile() { fuzzer_release_tmpfile(filename_); }
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const char* filename() const { return filename_; }
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private:
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char* filename_;
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};
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#endif
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#endif // FUZZER_TEMP_FILE_H_
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