// /**
//  * File: SSH.cs
//  * Author: haraldwolff
//  *
//  * This file and it's content is copyrighted by the Author and / or copyright holder.
//  * Any use wihtout proper permission is illegal and may lead to legal actions.
//  *
//  *
//  **/
using System;
using Renci.SshNet;
using ln.types;
using Renci.SshNet.Common;
using System.Net.Sockets;
namespace ln.skyscanner.crawl.tests
{
    public static class SSH
    {
        static string[] defaultPasswords = new string[]
        {
            "MNX3oTzhp9am",
            "f1whWdj5E2Mo",
            "f1whWdj5",
            "0Sl71eGw",
            "0Sl71eGwVdjI6WeW",
            "67E3xpTc",
            "67E3xpTcMbwR",
            "v1kXbeCux0Td",
            "v1kXbeCu",
            "YNZRtVUFH94b",
            "67E3xpTcMbwR",
            "v1kXbeCux0Td",
            "DVqxof1JQ9at"
        };


        public static bool CanConnect(CrawledHost crawledHost)
        {
            int sshPort = crawledHost.GetHint<int>("ssh.port", -1);
            CIDR sshIP = crawledHost.GetHint<CIDR>("ssh.ip", null);
            string sshUser = crawledHost.GetHint<string>("ssh.login", null);
            string sshPassword = crawledHost.GetHint<string>("ssh.password", null);

            if ((sshPort == -1) || !CanConnect(crawledHost,sshIP.Host,sshPort,sshUser,sshPassword))
            {
                if (!Scan(crawledHost))
                {
                    crawledHost.SetHint("ssh.port", -1);
                    crawledHost.SetHint("ssh.ip", null);
                    crawledHost.SetHint("ssh.login", null);
                    crawledHost.SetHint("ssh.password", null);
                    crawledHost.SetHint("ssh.version", null);
                    return false;
                }
            }
            return true;
        }

        private static bool Scan(CrawledHost crawledHost)
        {
            foreach (CIDR ip in crawledHost.IPAddresses)
            {
                foreach (int port in new int[] { 13022, 22 })
                {
                    foreach (string password in defaultPasswords)
                    {
                        if (CanConnect(crawledHost, ip.Host, port, "skytron", password))
                            return true;
                    }
                }
            }
            return false;
        }

        private static bool CanConnect(CrawledHost crawledHost, CIDR host, int port, string username, string password)
        {
            using (SshClient client = new SshClient(host.ToString(), port, username, password))
            {
                client.ConnectionInfo.Timeout = TimeSpan.FromSeconds(1);
                try
                {
                    client.Connect();

                    crawledHost.SetHint("ssh.port", client.ConnectionInfo.Port);
                    crawledHost.SetHint("ssh.ip", host);
                    crawledHost.SetHint("ssh.login", client.ConnectionInfo.Username);
                    crawledHost.SetHint("ssh.password", password);
                    crawledHost.SetHint("ssh.version", client.ConnectionInfo.ServerVersion);

                    client.Disconnect();
                    return true;
                }
                catch (SshException)
                {
                }
                catch (SocketException)
                {
                    return false;
                }
            }
            return false;
        }



    }
}