Tunneler And Stones Mac OS

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So far in this series of posts on ssh on macOS:

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Tunneler And Stones Mac OS
  • SSH Tunnels (this post)

Please consider supporting Scripting OS X by buying one of my books!

We have learned so far that ssh is a really useful and flexible protocol. It can be used to connect securely to a remote shell, or to transfer files securely.

Rather than providing the shell itself, ssh provides a secure way to transmit data to and from the remote shell. In a similar way, ssh can be used to provide access to other remote services as well.

SSH Tunnels with Two Computers

Access to important services are usually blocked behind a firewall or router. Since ssh, when setup correctly, is quite secure, you can usually get access to a server with ssh even when other protocols are blocked. (Though some administrators move ssh access to a different port than the default 22.) Phantom pillar mac os.

You can use ssh port forwarding or ‘tunneling' to gain access to other services through ssh.

Imagine you want to use Screen Sharing to connect to a remote Mac (remote.example.com). Screen Sharing on macOS uses the VNC port 5900 to connect to a remote Mac. Since VNC itself is inherently insecure, (mac Screen Sharing adds a few things to make it more secure) this port is blocked by many firewalls.

However, I do have ssh access to remote.example.com. So, how do I tell both systems to ‘tunnel' the screen sharing traffic through ssh?

(When you test this, remember to enable either ‘Screen Sharing' or ‘Remote Management' (i.e Apple Remote Desktop) access in the ‘Sharing' pane in System Preferences on the remote Mac.)

The tunnel starts on my local machine and ends on remote.example.com at port 5900 (where the screen sharing service is listening on the remote Mac.)

The starting point also needs a port number, and I can basically choose freely. Port numbers under 1000 and over 49000 are reserved for the system and require root privileges. There are also many numbers that are commonly used by certain services (such as 5900 for VNC/Screen Sharing) and may already be in use. I will choose 5901 for the local port.

To connect the local port 5901 to port 5900 on the remote Mac use the following command:

(You can just try this with a second Mac or virtual machine in your network, even without a firewall.)

The syntax of this command is less than obvious. Let's break it into pieces:

The -N option tells ssh that we do not want to invoke a remote shell or run a remote command.

The -L option creates a local port forwarding setup. This option takes a parameter with three or four parts, separated by colons :. The first pair (localhost:5901) are the tunnel start point. The second pair (localhost:5900) are the remote end point of the tunnel.

The second localhost is resolved on the remote host, so this means port 5900 on the remote host.

The last parameter states the remote host, to connect to, remote.example.com.

This commands tell ssh to connect to remote.example.com and establish a tunnel that transfers traffic from port 5901 on my computer to port 5900 on the remote computer.

Since the origin of my tunnel is usually on my local computer, the first localhost can be omitted, so you only see the origin port.

When you execute the command nothing will happen. You will not even get a new prompt, because the ssh process is running until you cancel it with ctrl-C. Don't cancel it yet, however, since it needs to run to provide the tunnel.

So, when you open the Screen Sharing application (from /System/Library/CoreServices/Applications/) and connect to localhost:5901 all traffic will be forwarded by sshto port 5900 on the remote Mac.

You can also use the open command to connect with Screen Sharing:

You should be able connect with Screen Sharing, even when port 5900 is blocked by a Firewall.

When you are done with the Screen Sharing session, you can end the ssh tunnel process in Terminal with ctrl-C.

You can also use ssh port to use the remote host as a gateway or ‘jump host' to a third computer. Imagine you want to use Screen Sharing to connect to secundus.example.com behind a firewall and you only have ssh connection to primus.example.com available. You can tell primus to point the endpoint of an ssh tunnel at secundus with:

Note: secundus.example.com or whatever host or IP address you enter there will be resolved on the remote host. So you can use NAT IP addresses or .local host names here, even if they do not make sense in the network your work Mac is in. (They do have to make sense on the remote host, though, otherwise you will get an error.)

In the following examples the local IP address 192.168.1.200 or the Bonjour hostname Secundus.local will be resolved on the remote host, even if they don't work on my local computer:

Either way, you can then point Screen Sharing at localhost:5902 and it will connect through primus to Screen Sharing on secundus.

Keep in mind, that while the connection from the start point (on your Mac) to the host primus is secured by ssh the connection from primus to secundus is not.

Stumbling over HTTP hosts

In general you can use ssh port forwarding (or tunnels) for any service. Some services however, may introduce extra pitfalls.

Tunneler And Stones Mac Os 11

For example, I wanted to use ssh port forwarding to gain access to my home router's web interface. I can use ‘Back to My Mac' to ssh into one of the iMacs at home, and thought it should be easy to connect to the router with an ssh tunnel:

This seemed to work, but whenever I tried to point a browser to localhost:8080 it couldn't connect to the web page. The problem here is not the ssh tunnel but the the web server on the router. As part of the http request, the browser sends the name of the domain requested to the web server. This allows web servers to host different pages for different domains. With this request, the browser told the router it wanted the web page for localhost and the router replied with 'I don't serve pages for that host'… (Your router might behave differently.)

With curl I could convince the router to serve me the page with:

However, since navigating the web interface of the router with curl is out of the question I had to find a different solution.

Tunnel All the Things!

What if I could send all traffic through the iMac at home?

With the command

https://assistanterogon589.weebly.com/english-for-you-80-cds-download.html. I can create a tunnel from my computer (on port 9001) to the remote Mac that acts as a SOCKS proxy. Then I can set the Socks proxy to localhost:9001 in the proxy tab in the Network pane in System Preferences. You probably want to create a new network location for this setup. Then all network traffic will be securely routed through the ssh tunnel to my Mac at home where it can connect to the router.

This can also serve as a temporary VPN solution.

However it is somewhat painful to set up and maintain, so if you start using this more frequently, you probably need to look into a proper VPN service solution (some routers, ironically, provide one…).

Summary

  • you can bypass firewalls and other network blocks by tunnel traffic for any service through a ssh tunnel
  • the command describes which local port to connect to which port on the remote host
  • you can even tell the remote host to connect the end point to a third computer, behind the firewall
  • you can also create a SOCKS proxy with ssh to tunnel all traffic

Previous Post: Transferring Files with ssh

A downloadable game for Windows, macOS, and Linux

Tunneler And Stones Mac Os Update

This game was made for the 64kB Jam, the Tunneler Remake Jam, the Simple Tools Jam and the MS Paint Jam.

Controls:
W/Up=Forward
AD/Left Right=Rotate Left / Right
D/Down=Backward
Space=Shoot to damage Enemy or Dirt
1 2 3=place a small middle or large stone (very high energy cost)
H=Help
Click=Look in the direction (added after jams ended)

How to Play:
Search the other player and attack him to win the game.
You can damage him, by shooting or move in his base for slow damage.
Stones can't be placed near a player or base.
You can restore your energy in your base.

Tunneler And Stones Mac Os Download

No assets or work from other persons or the past was used.

Tunneler Remake Jam:
I used the video of the Tunneler Jam for the game mechanics.

Simple Tools Jam:
I only used Paint for planning the game and coded it completely in notepad++.

MS Paint Jam:
I planned all graphics in Paint and then implemented it procedurally.

64kB Jam:
The jar file of the game is only 15kB in size. This means it is less than half the size of this generated image of the stone texture:

Stone Texture (54kB as PNG and 38kB as JPG

The game is small enough to fit in this 128x128 image with steganography.

Rgb puzzle platformer mac os.

A Map with large stones.


A map of an actual game.


The Client view, who is attacked.


The Server who attack the client.
StatusReleased
PlatformsWindows, macOS, Linux
AuthorNeuralCoder
GenreAction, Shooter
Tags2D, 8-Bit, Cult Classic, Exploration, Local multiplayer, Multiplayer, paint, Procedural Generation, Remake

Download

Click download now to get access to the following files:

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