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Storage.swift
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Storage.swift
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// Copyright 2019 Google LLC
//
// 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
//
// https://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.
import Foundation
/// Module to store programs to disk.
public class Storage: Module {
private let storageDir: String
private let crashesDir: String
private let duplicateCrashesDir: String
private let interestingDir: String
private let statisticsDir: String
private let stateFile: String
private let failedDir: String
private let timeOutDir: String
private let diagnosticsDir: String
private let stateExportInterval: Double?
private let statisticsExportInterval: Double?
private unowned let fuzzer: Fuzzer
private let logger: Logger
public init(for fuzzer: Fuzzer, storageDir: String, stateExportInterval: Double? = nil, statisticsExportInterval: Double? = nil) {
self.storageDir = storageDir
self.crashesDir = storageDir + "/crashes"
self.duplicateCrashesDir = storageDir + "/crashes/duplicates"
self.interestingDir = storageDir + "/interesting"
self.failedDir = storageDir + "/failed"
self.timeOutDir = storageDir + "/timeouts"
self.statisticsDir = storageDir + "/stats"
self.stateFile = storageDir + "/state.json"
self.diagnosticsDir = storageDir + "/diagnostics"
self.stateExportInterval = stateExportInterval
self.statisticsExportInterval = statisticsExportInterval
self.fuzzer = fuzzer
self.logger = fuzzer.makeLogger(withLabel: "Storage")
}
public func initialize(with fuzzer: Fuzzer) {
do {
try FileManager.default.createDirectory(atPath: crashesDir, withIntermediateDirectories: true)
try FileManager.default.createDirectory(atPath: duplicateCrashesDir, withIntermediateDirectories: true)
try FileManager.default.createDirectory(atPath: interestingDir, withIntermediateDirectories: true)
try FileManager.default.createDirectory(atPath: statisticsDir, withIntermediateDirectories: true)
if fuzzer.config.diagnostics {
try FileManager.default.createDirectory(atPath: failedDir, withIntermediateDirectories: true)
try FileManager.default.createDirectory(atPath: timeOutDir, withIntermediateDirectories: true)
try FileManager.default.createDirectory(atPath: diagnosticsDir, withIntermediateDirectories: true)
}
} catch {
logger.fatal("Failed to create storage directories. Is \(storageDir) writable by the current user?")
}
fuzzer.registerEventListener(for: fuzzer.events.CrashFound) { ev in
let filename = "crash_\(String(currentMillis()))_\(ev.behaviour.rawValue)_\(ev.signal).js"
let fileURL: URL
if ev.isUnique {
fileURL = URL(fileURLWithPath: "\(self.crashesDir)/\(filename)")
} else {
fileURL = URL(fileURLWithPath: "\(self.duplicateCrashesDir)/\(filename)")
}
let code = fuzzer.lifter.lift(ev.program)
self.storeProgram(code, to: fileURL)
}
if fuzzer.config.diagnostics {
fuzzer.registerEventListener(for: fuzzer.events.DiagnosticsEvent) { ev in
let filename = "/\(ev.name)_\(String(currentMillis()))"
let fileURL = URL(fileURLWithPath: self.diagnosticsDir + filename)
self.storeProgram(ev.content, to: fileURL)
}
fuzzer.registerEventListener(for: fuzzer.events.InvalidProgramFound) { program in
let filename = "invalid_\(String(currentMillis())).js"
let fileURL = URL(fileURLWithPath: "\(self.failedDir)/\(filename)")
let code = fuzzer.lifter.lift(program, withOptions: .dumpTypes)
self.storeProgram(code, to: fileURL)
}
fuzzer.registerEventListener(for: fuzzer.events.TimeOutFound) { program in
let filename = "timeout_\(String(currentMillis())).js"
let fileURL = URL(fileURLWithPath: "\(self.timeOutDir)/\(filename)")
let code = fuzzer.lifter.lift(program, withOptions: .dumpTypes)
self.storeProgram(code, to: fileURL)
}
}
fuzzer.registerEventListener(for: fuzzer.events.InterestingProgramFound) { ev in
let filename = "sample_\(String(currentMillis())).js"
let fileURL = URL(fileURLWithPath: "\(self.interestingDir)/\(filename)")
let code = fuzzer.lifter.lift(ev.program, withOptions: .dumpTypes)
self.storeProgram(code, to: fileURL)
}
// If enabled, export the current fuzzer state to disk in regular intervals.
if let interval = stateExportInterval {
fuzzer.timers.scheduleTask(every: interval, saveState)
fuzzer.registerEventListener(for: fuzzer.events.Shutdown, listener: saveState)
}
// If enabled, export fuzzing statistics to disk in regular intervals.
if let interval = statisticsExportInterval {
guard let stats = Statistics.instance(for: fuzzer) else {
logger.fatal("Requested stats export but not Statistics module is active")
}
fuzzer.timers.scheduleTask(every: interval) { self.saveStatistics(stats) }
fuzzer.registerEventListener(for: fuzzer.events.Shutdown) { self.saveStatistics(stats) }
}
}
private func storeProgram(_ code: String, to url: URL) {
do {
try code.write(to: url, atomically: false, encoding: String.Encoding.utf8)
} catch {
logger.error("Failed to write program to disk: \(error)")
}
}
private func saveState() {
do {
let state = try fuzzer.exportState()
let url = URL(fileURLWithPath: self.stateFile)
try state.write(to: url)
} catch {
logger.error("Failed to write state to disk: \(error)")
}
}
private func saveStatistics(_ stats: Statistics) {
let statsData = stats.compute()
let formatter = ISO8601DateFormatter()
formatter.timeZone = TimeZone.current
let datetime = formatter.string(from: Date())
do {
let data = try statsData.jsonUTF8Data()
let url = URL(fileURLWithPath: "\(self.statisticsDir)/\(datetime).json")
try data.write(to: url)
} catch {
logger.error("Failed to write statistics to disk: \(error)")
}
}
}