vim-dadbod-ssh

NeoVim plugin that allows vim-dadbod connections to remote servers through ssh.

It's actually a wrapper for existing adapters. It creates ssh tunnel using ssh -L ... and then passing changed connection url to proper adapter.

It was tested with mysql, I'm not sure how well it works with other connections, if you are using it with other db please let me know.

Requirements

• NeoVim - Plugin is using nvim's jobstart() API to create and keep tunnel, I'm sure it can be done for Vim 8+ as well. I would be grateful for PR ❤️
• Linux or MacOS - adapter is using ssh command to connect to the remote server. It is also using following commands: netstat (Linux), lsof (MacOS), grep, awk and sed. To be more specific this command is used: netstat -tuplen 2>/dev/null | grep {localhost} | awk '{print $4}' | sed 's/.*://g' (Linux) lsof -nP -iTCP -sTCP:LISTEN 2>/dev/null | grep {localhost} | awk '{print $9}' | sed 's/.*://g' (MacOS)

Installation

Using vim-plug:

Plug 'tpope/vim-dadbod'

Plug 'pbogut/vim-dadbod-ssh'

Or use your favourite method / package manager.

Configuration

Adapter format is quite simple, here is example for mysql connection:

let g:my_db = "ssh://sshremotehost:mysql://user:password@databasehost/db_name"

Do not use DB g:my_db = "ssh://..... especially in your start-up scripts, as this command will create tunnel (which may take couple seconds) and assign modified URL to the g:my_db variable (see how it works section), which will work for some time but will fail if tunnel breaks and new one will have to be established.

As you can see normal connection URL is prepended with ssh://sshremotehost:

How to set up SSH password? Please, use public key. How to set up user and port? You can do this in your $HOME/.ssh/config:

Host mydbhost-name
  User username
  HostName 123.123.123.123
  Port 22222

With that you can use ssh://mydbhost-name: in your connection string.

To work adapter don't need any additional configuration, but there are few things one may want to adjust.

• g:db_adapter_ssh_localhost - defaults to 127.0.0.1 Why IP and not just localhost? It is used to replace your connection host and localhost is causing issues with mysql (maybe others too?). When host is localhost mysql is trying to connect with socket instead of network.
• g:db_adapter_ssh_timeout - defaults to 10000 (10 seconds) It's how long adapter will wait for tunnel to be established.
• g:db_adapter_ssh_port_range - defaults to range(7000, 7100) It's range of local ports that will be used to create tunnels, you can specific different range. Script is checking if port is available before trying to create tunnel, so if some IPs in range are taken that should be fine.

So how it works?

On first connection ssh is used to create tunnel to the remote server. Then in connection URL port and host are changed to use localhost and port that was used to create tunnel. URL modified like that is then passed to the adapter.

With this URL ssh://sshremotehost:mysql://user:password@databasehost/db_name adapter will run: ssh -L 7000:databasehost:3306 -t echo ssh_connected; read. URL is modified to mysql://user:password@127.0.0.1:7000/db_name and that is passed to the mysql adapter.

read is used to keep connection alive and echo to confirm when connection is established. -N could be used instead read but then would have to find another method to confirm connection was established. If you have better ideas I accept PR's.

Contributions

Always welcome.

License

MIT License; The software is provided "as is", without warranty of any kind.