Detect iOS jailbreak - App

ViewController.swift

// ViewController.swift

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        
        func filenameOnRootDirectory(file: String) -> String {
            
            // hex array for for "../"
            let ddback: String = byteArrayToString(
                array: [0x2e, 0x2e, 0x2f]
            )
            // hex array for ".."
            let dd: String = byteArrayToString(
                array: [0x2e, 0x2e]
            )
            
            // how many times to prepend "../" in front of filename
            let max = Int(arc4random_uniform(UInt32((35 - 15) + 1))) + 15
            var preString: String = ""
            for _ in 0..<max {
                preString += ddback
            }
            preString += dd
            
            // "../" * random + ".." + filename
            // (filename starts with "/")
            return preString + file
        }
        
        func byteArrayToString(array: [UInt8]) -> String {
            return String(
                data: NSData(
                    bytes: array, length: array.count
                    ) as Data,
                encoding: String.Encoding.utf8
                )!
        }
        
        // hex array for "/var/lib/apt"
        let str: String = byteArrayToString(array: [
            0x2f, 0x76, 0x61, 0x72,
            0x2f, 0x6c, 0x69, 0x62,
            0x2f, 0x61, 0x70, 0x74
            ])
        let str_ddslash = filenameOnRootDirectory(file: str)
        var jailbroken = false
        
        if FileManager.default.fileExists(atPath: str) || FileManager.default.fileExists(atPath: str_ddslash) {
            jailbroken = true
        }
        
        if let f = fopen(str, "r") {
            fclose(f)
            jailbroken = true
        }
        
        if let f = fopen(str_ddslash, "r") {
            fclose(f)
            jailbroken = true
        }
        
        print("JB: ", jailbroken);
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
}