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"use strict"
const fs = require("fs")
const { FuzzedDataProvider } = require("@jazzer.js/core")
const RULES_JS_FILE = process.env.RTT_RULES || "rules.js"
const MAX_STEPS = parseInt(process.env.MAX_STEPS) || 2048
const NO_UNDO = process.env.NO_UNDO === 'true'
const NO_RESIGN = process.env.NO_RESIGN === 'true'
console.log(`Loading rtt-fuzzer RTT_RULES='${RULES_JS_FILE}' MAX_STEPS=${MAX_STEPS}`)
if (!fs.existsSync(RULES_JS_FILE)) {
throw Error("rules.js not found, specify via RTT_RULES environment variable.")
}
const RULES = require(RULES_JS_FILE)
module.exports.fuzz = function(fuzzerInputData) {
let data = new FuzzedDataProvider(fuzzerInputData)
if (data.remainingBytes < 16) {
// insufficient bytes to start
return
}
let seed = data.consumeIntegralInRange(1, 2**35-31)
let scenario = data.pickValue(RULES.scenarios)
// TODO randomize options
const options = {}
let game_setup = {
"seed": seed,
"scenario": scenario,
"options": options
}
// console.log(game_setup)
let state = RULES.setup(seed, scenario, options)
let step = 0
while (true) {
if (data.remainingBytes < 16) {
// insufficient bytes to continue
return
}
let active = state.active
if (active === 'Both' || active === 'All') {
// If multiple players can act, we'll pick a random player to go first.
active = data.pickValue(RULES.roles)
}
let view = RULES.view(state, active)
if (step > MAX_STEPS) {
log_crash(game_setup, state, view, step, active)
throw new MaxStepsExceededError(`Maximum step count (MAX_STEPS=${MAX_STEPS}) exceeded`)
}
if (state.state === 'game_over') {
break
}
if (!view.actions) {
log_crash(game_setup, state, view, step, active)
throw new NoMoreActionsError("No actions defined")
}
let actions = view.actions
if (NO_UNDO && 'undo' in actions) {
// remove `undo` from actions, useful to test for dead-ends
delete actions['undo']
}
if (!NO_RESIGN && RULES.resign) {
actions['_resign'] = 1
}
// Tor: view.actions["foo"] === 0 means the "foo" action is disabled (show the button in a disabled state)
// Also ignoring the actions with `[]` as args, unsure about this but needed for Nevsky.
for (const [key, value] of Object.entries(actions)) {
if (value === false || value === 0 || value.length === 0) {
delete actions[key]
}
}
if (Object.keys(actions).length === 0) {
log_crash(game_setup, state, view, step, active)
throw new NoMoreActionsError("No more actions to take (besides undo)")
}
let action = data.pickValue(Object.keys(actions))
let args = actions[action]
if (args !== undefined && args !== null && typeof args !== "number" && typeof args !== "boolean") {
// check for NaN as any suggested action argument and raise an error on those
for (const arg in args) {
if (isNaN(arg)) {
log_crash(game_setup, state, view, step, active)
throw new InvalidActionArgument(`Action '${action}' argument has NaN value`)
}
}
args = data.pickValue(args)
}
// console.log(action, args)
try {
if (action !== "_resign") {
state = RULES.action(state, active, action, args)
} else {
state = RULES.resign(state, active)
}
} catch (e) {
log_crash(game_setup, state, view, step, active, action, args)
throw new RulesCrashError(e, e.stack)
}
step += 1
}
}
function log_crash(game_setup, state, view, step, active, action=undefined, args=undefined) {
console.log()
// console.log("STATE", state)
console.log("GAME", game_setup)
console.log("VIEW", view)
if (action !== undefined) {
console.log(`STEP=${step} ACTIVE=${active} ACTION: ${action} ` + JSON.stringify(args))
} else {
console.log(`STEP=${step} ACTIVE=${active}`)
}
console.log("STATE dumped to 'crash-state.json'\n")
fs.writeFileSync("crash-state.json", JSON.stringify(state))
}
// Custom Error classes, allowing us to ignore expected errors with -x
class MaxStepsExceededError extends Error {
constructor(message) {
super(message)
this.name = "MaxStepsExceededError"
}
}
class NoMoreActionsError extends Error {
constructor(message) {
super(message)
this.name = "NoMoreActionsError"
}
}
class InvalidActionArgument extends Error {
constructor(message) {
super(message)
this.name = "InvalidActionArgument"
}
}
class RulesCrashError extends Error {
constructor(message, stack) {
super(message)
this.name = "RulesCrashError";
this.stack = stack
}
}
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