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"use strict"
const crypto = require('crypto')
const fs = require("fs")
const path = require("path")
const { FuzzedDataProvider } = require("@jazzer.js/core")
const RULES_JS_FILE = process.env.RULES || "rules.js"
const MAX_ERRORS = parseInt(process.env.MAX_ERRORS || 100)
const MAX_STEPS = parseInt(process.env.MAX_STEPS || 10000)
const TIMEOUT = parseInt(process.env.TIMEOUT || 250)
console.log(`Loading fuzzer ${RULES_JS_FILE}`)
const rules = require(RULES_JS_FILE)
const title_id = path.basename(path.dirname(RULES_JS_FILE))
var error_count = 0
globalThis.RTT_FUZZER = true
exports.fuzz = function (fuzzerInputData) {
var data = new FuzzedDataProvider(fuzzerInputData)
if (data.remainingBytes < 16) {
// insufficient bytes to start
return
}
var scenarios = Array.isArray(rules.scenarios) ? rules.scenarios : Object.values(rules.scenarios).flat()
var scenario = data.pickValue(scenarios)
if (scenario.startsWith("Random"))
return
var timeout = Date.now() + TIMEOUT
var options = {} // TODO: randomize options
var roles = rules.roles
if (typeof roles === "function")
roles = roles(scenario, options)
var seed = data.consumeIntegralInRange(1, 2 ** 35 - 31)
var ctx = {
player_count: roles.length,
players: roles.map((r, ix) => ({ role: r, name: "rtt-fuzzer-" + (ix+1) })),
scenario,
options,
replay: [],
state: {},
active: null,
step: 0,
}
ctx.replay.push([ null, ".setup", [ seed, scenario, options ] ])
ctx.state = rules.setup(seed, scenario, options)
while (ctx.state.active && ctx.state.active !== "None") {
// insufficient bytes to continue
if (data.remainingBytes < 16)
return
ctx.active = ctx.state.active
// If multiple players can act, we'll pick a random player to go first.
if (Array.isArray(ctx.active))
ctx.active = data.pickValue(ctx.active)
if (ctx.active === "Both")
ctx.active = data.pickValue(roles)
try {
ctx.view = rules.view(ctx.state, ctx.active)
} catch (e) {
return log_crash(e, ctx)
}
if (ctx.step > MAX_STEPS)
return log_crash("MaxSteps", ctx)
if (Date.now() > timeout)
return log_crash("Timeout", ctx)
if (ctx.view.prompt && ctx.view.prompt.startsWith("TODO:"))
return log_crash(ctx.view.prompt, ctx)
if (!ctx.view.actions)
return log_crash("NoMoreActions", ctx)
var actions = Object.entries(ctx.view.actions).filter(([ action, args ]) => {
// remove undo from action list (useful to test for dead-ends)
if (action === "undo")
return false
// remove disabled buttons from action list
if (args === 0 || args === false)
return false
return true
})
if (actions.length === 0)
return log_crash("NoMoreActions", ctx)
var [ action, args ] = data.pickValue(actions)
var arg = undefined
if (Array.isArray(args)) {
for (arg of args) {
if (typeof arg !== "number")
return log_crash(`BadActionArgs: ${action} ${JSON.stringify(args)}`, ctx)
}
arg = data.pickValue(args)
} else if (args !== 1 && args !== true) {
return log_crash(`BadActionArgs: ${action} ${JSON.stringify(args)}`, ctx)
}
var prev_state = object_copy(ctx.state)
try {
ctx.state = rules.action(ctx.state, ctx.active, action, arg)
if (typeof rules.assert === "function")
rules.assert(ctx.state)
} catch (e) {
ctx.state = prev_state
return log_crash(e, ctx, action, arg)
}
ctx.replay.push([ ctx.active, action, arg ])
if (ctx.state.undo.length > 0) {
if (String(prev_state.active) !== String(ctx.state.active))
return log_crash("UndoAfterActiveChange", ctx, action, arg)
if (prev_state.seed !== ctx.state.seed)
return log_crash("UndoAfterRandom", ctx, action, arg)
}
ctx.step += 1
}
}
function log_crash(message, ctx, action = undefined, arg = undefined) {
if (message instanceof Error)
message = message.stack
var line = `ERROR=${message}`
line += `\n\tTITLE=${title_id} ACTIVE=${ctx.active} STATE=${ctx.state?.state ?? ctx.state?.L?.P} STEP=${ctx.step}`
line += "SETUP=" + JSON.stringify(ctx.replay[0][2])
if (action !== undefined) {
line += `\n\t\tACTION=${action}`
if (arg !== undefined)
line += JSON.stringify(arg)
}
var game = {
setup: {
title_id,
scenario: ctx.scenario,
options: ctx.options,
player_count: ctx.player_count,
},
players: ctx.players,
state: ctx.state,
replay: ctx.replay,
}
var json = JSON.stringify(game)
var hash = crypto.createHash("sha1").update(json).digest("hex")
var dump = `fuzzer/dump-${title_id}-${hash}.json`
line += "\n\tDUMP=" + dump
if (!fs.existsSync(dump)) {
console.log(line)
fs.writeFileSync(dump, json)
} else {
console.log(line)
}
if (++error_count >= MAX_ERRORS)
throw new Error("too many errors")
}
function object_copy(original) {
var copy, i, n, v
if (Array.isArray(original)) {
n = original.length
copy = new Array(n)
for (i = 0; i < n; ++i) {
v = original[i]
if (typeof v === "object" && v !== null)
copy[i] = object_copy(v)
else
copy[i] = v
}
return copy
} else {
copy = {}
for (i in original) {
v = original[i]
if (typeof v === "object" && v !== null)
copy[i] = object_copy(v)
else
copy[i] = v
}
return copy
}
}
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