Copy url in link to webform
Probably the easiest way to do it would be to pass the path in a GET variable and use a token.

So on your node page edit the webform link to include the path like so

&lt;a href="/link/to/webform?yoururl=theurlyoureon"&gt;Webform link&lt;/a&gt;


Then on your webform for that textfield use [current-page:query:yoururl] as your default value.

Obviously replace yoururl with whatever you want to name the variable.