From: drtr@ast.cam.ac.uk (David Robinson)
Subject: Trap recursive includes
Affects: util.c
ChangeLog: Trap recursive includes.
Comments: Recursive includes can occur if the client supplies PATH_INFO data
          and the server provider uses relative links; as
          file.html relative to /doc.shtml/pathinfo is
          /doc.shtml/file.html.

*** mod_include.c.orig	Fri Nov 17 21:33:17 1995
--- mod_include.c	Mon Dec 11 16:19:03 1995
***************
*** 381,386 ****
--- 381,396 ----
  		&& (strncmp (rr->content_type, "text/", 5)))
  	        error_fmt =
  		  "unable to include potential exec %s in parsed file %s";
+ 
+ 	    if (error_fmt == NULL)
+ 	    {
+ 		request_rec *p;
+ 
+ 		for (p=r; p != NULL; p=p->main)
+ 		    if (strcmp(p->filename, rr->filename) == 0) break;
+ 		if (p != NULL)
+ 		    error_fmt = "Recursive include of %s in parsed file %s";
+ 	    }
  	    
  	    if (!error_fmt && run_sub_req (rr))
  	        error_fmt = "unable to include %s in parsed file %s";