From 699a1c505588f53380e52f479370fb86da6e1362 Mon Sep 17 00:00:00 2001
From: Mischa Untaga <99098079+MischaU8@users.noreply.github.com>
Date: Fri, 25 Aug 2023 13:20:17 +0200
Subject: Initial commit

---
 rtt-module.js | 110 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100755 rtt-module.js

(limited to 'rtt-module.js')

diff --git a/rtt-module.js b/rtt-module.js
new file mode 100755
index 0000000..433d52e
--- /dev/null
+++ b/rtt-module.js
@@ -0,0 +1,110 @@
+"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
+
+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)
+    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) {
+        let view = RULES.view(state, state.active)
+        
+        if (step > MAX_STEPS) {
+            log_crash(game_setup, state, view, step)
+            throw new MaxStepsExceededError(`Maximum step count (MAX_STEPS=${MAX_STEPS}) exceeded`)
+        }
+        
+        if (state.state === 'game_over') {
+            break
+        }
+        
+        if (!view.actions) {
+            log_crash(game_setup, state, view, step)
+            throw new NoMoreActionsError("No actions defined")
+        }
+        
+        let actions = view.actions
+        if ('undo' in actions) {
+            delete actions['undo']
+        }
+        
+        if (actions.length === 0) {
+            log_crash(game_setup, state, view, step)
+            throw new NoMoreActionsError("No more actions to take (besides undo)")
+        }
+        let action = data.pickValue(Object.keys(actions))
+        let args = actions[action]
+        if (args !== undefined && args !== null && typeof args !== "number") {
+            args = data.pickValue(args)
+        }
+
+        try {
+            state = RULES.action(state, state.active, action, args)
+        } catch (e) {
+            log_crash(game_setup, state, view, step, action, args)
+            throw new RulesCrashError(e, e.stack)
+        }
+        step += 1
+    }
+}
+
+
+function log_crash(game_setup, state, view, step, action=undefined, args=undefined) {
+    console.log()
+    // console.log("STATE", state)
+    console.log("GAME", game_setup)
+    console.log("VIEW", view)
+    if (action !== undefined) {
+        console.log(`STEP=${step} ACTIVE=${state.active} ACTION: ${action} ` + JSON.stringify(args))
+    } else {
+        console.log(`STEP=${step} ACTIVE=${state.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 RulesCrashError extends Error {
+    constructor(message, stack) {
+      super(message)
+      this.name = "RulesCrashError";
+      this.stack = stack
+    }
+}
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