Example of permanent reverse tunnel using libssh2. More at: Reverse SSH tunnel with libssh2
To compile, simply run make in the repository.
It depends on libssh2, which you will have to install. On OS X, you can install it using HomeBrew: brew install libssh2
The executable generated can be run as follows:
./libssh2-tunnel-example <remote_host> <username> <password>
By default this code will forward all TCP/IP connections to the remote host on port 4000, to the local machine on port 8080. To change the remote or local ports to be used, you can modify the remote_wantport and local_destport on libssh2-tunnel-example.c, compile, and run it again.
One way to easily test this is to open a simple HTTP server on the local machine on port 8080 and perform a HTTP GET request on the remote server on port 4000:
- on local machine:
python -m SimpleHTTPServer 8080 - on remote host:
curl localhost:4000
You can also test this using netcat:
- on local machine:
nc -l 8080 - on remote host:
nc 127.0.0.1 4000