The Crystal Golem Mac OS
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To easily install Crystal on macOS you can use Homebrew. Brew update brew install crystal You should be able to install the latest version from homebrew. Crystal’s core-team help maintain that formula. Now you can build a Mac-like user interface in minutes. Our Mac-Inspired theme is now available as a part of the latest release of Telerik UI for WPF and WinForms. This post will walk you through how easy it is to use it in your applications, plus you'll get a sneak peek at the numerous customization opportunities that come with it.
), a message containing data to be forwarded (kProto_data), an explicit acknowledgement of received packets (kProto_ack, a close message (kProto_close) or an authentication challenge/response (kProto_authenticate). Second, it indicates who sent the message: A message sent by the client will have the kUser_flag bit set, whereas a message sent by the proxy has the kProxy_flag bit set. This is necessary since a ping request will cause the operating system on the proxy computer to return its own echo reply, which is identical to the packet we just sent to the proxy.The ack and seq fields are tightly related. Modelled after the use of acknowledgements in TCP, the ptunnel protocol places the sequence number of the last packet received into the ack field of any outgoing message. The seq field is a monotonically increasing 16-bit counter, that is allowed to wrap around (ok, so I guess it's monotonic until it wraps around). Whenever an outgoing packet has been waiting for an acknowledgement too long, the peer will attempt to resend the first packet not yet acknowledged.The length field simply indicates the length of the data portion of the packet, and is 0 for all other state values than kProto_data. Finally the rsv field contains two bytes that are reserved (for now they serve as padding).
On receiving a kProxy_start request, a proxy will open a TCP connection to the server given by the ip and port fields. As data comes in over the TCP connection, the proxy will convert the data to ICMP echo reply packets, and send them to the remote peer. The client will do the same, except its packets will always be echo request packets.
Authentication
As of version 0.60, Ping Tunnel supports authentication. The authentication used is very simple, and works as follows. The user first specifies a password or passphrase, which is then hashed using the MD5 algorithm (Ping Tunnel uses the implementation by L. Peter Deutsch, available here. Note that the implementation is included with Ping Tunnel, so there is no need to download it separately).The Crystal Golem Mac Os Download
Whenever a proxy receives a request for a new tunnel, it will respond with an authentication challenge. The challenge consists of a timestamp augmented with random data, totalling 32 bytes. The response is calculated as follows (the + denotes string concatenation):
md5(challenge + md5(password))
The proxy verifies the result by computing the same md5 sums, and then comparing the two. If authentication succeeds, the proxy allows TCP traffic to start flowing in either direction; if not, the connection is torn down.
Handling multiple connections
The proxy handles multiple different connections by using the ICMP identifier field. A client will randomly generate an identifier when it starts a session, and the remote peer will use this identifier to associate the packets with a connection. The mechanism is not foolproof, but works acceptably as long as no two instances attempt to use the same identifier (there is currently no mechanism for reporting such errors).The ICMP sequence number field is not used by ptunnel, mostly due to fears that some routers might drop packets whose sequence number repeats. Instead, a separate sequence number is used as part of the ptunnel packet format (see above).
Send and receive windows
Ptunnel uses the simple concept of send and receive windows for controlling the number of packets that can be in-flight at the same time. The window is currently statically allocated at 64 packets, but the number can be tweaked by modifying the ptunnel header file (yes, a recompile is required). Increasing the window size will improve the maximum potential bandwidth.The send and receive windows are simply implemented as a set of circular arrays, with pointers indicating the next available send/receive slot, and the first non-acked packet.Handling packet loss
Ptunnel handles packet loss by resending (presumably) lost packets. As it sends packets, it will increment a sequence number. Both the client and proxy maintain their own sequence number, and also a number indicating the last sequence number acknowledged by the remote peer. Whenever too much time (1.5 seconds) passes without a packet being acknowledged, the peer will resend that packet.Note that the peer will only resend the first missing packet. Once that packet has been acknowledged, it may resend the next packet(s), depending on how many packets were acknowledged. If the next few packets are acknowlegded as well, they are removed from the send queue. It is not uncommon for one packet to get lost, with most of the others making it through. This mechanism avoids unecessary resends as much as possible.
Congestion control
Ptunnel currently does no explicit congestion control. It will send as many ping packets as the window size allows, as slowly or as quickly as it sees fit. This might be improved in the future, if it turns out to be a problem (which is not at all unlikely..).When things don't work
There are a number of situations where ptunnel will fail. They can briefly be put into the following categories:- Outgoing/incoming ping not allowed, or filtered by a gateway somewhere along the way
- Operating system causing trouble
- Probably some other failures as well ;)
We can't handle the first failure - if our packets are filtered before we can get at them, there's little we can do. It is possible to deal with the second scenario by using the packet capturing library to get the packets before the OS sees them. This is necessary on Mac OS X, and may be necessary on other platforms as well. The problem lies in that the OS may occasionally not deliver ICMP packets to the raw socket we have opened for sending and receiving. This happens when the ICMP packet is an echo request (which the OS handles by itself) or when the ICMP packet is a resend (for some weird reason). The workaround is to use packet capture, however this tends to diminish bandwidth by quite a bit. For this reason, you should always try to run the proxy without packet capturing, and see if that works first. (This is the default mode.)
[prMac.com] Kiev, Ukraine - Independent game studio, Solverlabs today is proud to announce the release of the major update to their popular Jenga style physics puzzle game 'Crystal Tower Pro' for Mac OS X. The update contains 2 new level packs: 'US Towers' and 'World Towers' with real life famous US and world towers, completely redesigned and improved user interface and 3D visuals, updated game play logic, new backgrounds and educational interactive Towers Quiz. The update includes detailed help screens and interactive tutorial to help users get started with the game rules.The new version of the 'Crystal Tower Pro' for Mac OS X was specially optimized for Mac users. For example, in this version players can break multiple blocks simultaneously using multi-click. In order to active multi-click function users should just hold down Shift key on their keyboard.
'Crystal Tower Pro' is the ultimate 3D physics-based Jenga-style block removal puzzle. Every tower is constructed from blocks which are different in size, shape and color. The main goal of the game it to break all blue blocks and save all red blocks of the tower. Users should account for physical collisions and gravity rules to achieve perfect results. One Life items will be lost if the red block is broken or destroyed. The less red blocks are broken the more Crystals players earn on every level. Users can use Crystals to get more Life and Freeze items in the game's store. Freeze items should be used to complete tricky levels instantly. Due to physical-based engine every level can be completed in different ways.
Some blue blocks contain bonuses which rise from the bottom to the up when users break them. Players should tap a bonus with the finger to catch it. Some bonuses can change game play in a special way and the meaning of every bonus is explained during the game and in the Help menu.
Players can rotate towers 360 degrees, zoom towers in and out and move every tower up and down using their mouse and special keyboard keys. All special keys are explained in the help menu and interactive tutorial. Users can also break multiple blocks simultaneously using multi-click function which is required to complete some of the puzzles perfectly.
The App also features interactive Towers Quiz. The quiz works only on the 'US Towers' and 'World Towers' level packs. In the quiz users can guess correct tower name and earn more Crystals for every correct answer. Towers Quiz adds educational element to the game. Crystal Tower Pro contains more than 100 levels - some of them are pure crystal-smashing joy, some will make you think twice or more to complete. The game has 3 level packs:
* 'Crystal Towers' (virtual Towers to get you started)
* 'US Towers' (real life famous US Towers)
* 'World Towers' (real life famous World Towers)
Features:
* Stunning 3D Graphics and Effects
* More than 100 unique and challenging physics based levels
* 3 Level Packs: 'Crystal Towers', 'US Towers' and 'World Towers'
* Real life Towers from US and around the World
* Interactive Towers Quiz. Guess correct Tower name and earn more Crystals!
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* Multi-click support. You can crash multiple blocks at the same time
* Zoom in and Zoom out a tower with your mouse and keyboard
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* Rotate a tower using you mouse left click and drag* Built in Help and Tutorial
Device Requirements:
* Requires MAC OS X 10.6.6 or later
* 20.9 MB
Pricing and Availability:
Crystal Tower Pro 2.0 for Mac OSX is Free today for a limited time and available worldwide exclusively through the Mac App Store in the Games category.