Permanent ssh tunnel12/11/2022 ![]() ![]() Then, from your server, you open a SSH connection to the publicly accessible server and tell it to forward all data and connection requests from a specific port to a local port on your server. To set up a reverse tunnel, you need to have another server which is publicly accessible and have SSH access to it. For example, a server behind a firewall that denies incoming connections. In a SSH tunnel, a unencrypted traffic is wrapped around the SSH protocol and sent over an encrypted and secure connection.Ī reverse tunnel is a technique used to access a server in an internal network which is not accessible from the outside world. SSH is an encrypted network protocol widely used for remote command execution and secure data communication. This ends up causing a lot of confusion when searching for information in the web. So I decided to write this one to share what I have learned about libssh2 :-)Īlso, note that there is another open source library for SSH called libssh which, despite the similar name, has nothing to do with libssh2. #Permanent ssh tunnel how toDespite the API docs and some example files on the project’s website, I didn’t find any tutorial or a good blog post about how to use it. Unfortunately, there is not much documentation about how to use the library. Given its small size, stability, and good performance, it’s well suitable for embedded systems and is also used in many open source projects like curl. Libssh2 is a lean client-only C library that implements the SSH2 protocol. This article will show how to keep the tunnel permanently opened. The problem was that in this example the SSH tunnel is closed at the end of each client connection. #Permanent ssh tunnel codeThe implementation was based in the tcpip-forward.c example provided in the libssh2 code package. The general connection scheme is shown below.Recently, I had to fix a problem in a mobile library that uses libssh2 to open a reverse tunnel with a remote server. #Permanent ssh tunnel windowsIn this example, we will create a local Port 8888, and the connection to it will be forwarded to the RDP port 3389 on a remote Windows computer. All connections to this port are forwarded to the specified port on a remote server via the SSH tunnel. In this mode, you create a local TCP port on your computer. RDP Access Through SSH Tunnel (Local TCP Forwarding)
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