+++ This bug was initially created as a clone of Bug #236238 +++

Description of problem:

Does not escape names of symlinks when producing a script to be
passed to the shell, which could be abused by an attacked to
trick the user into executing arbitrary code with crafted symbolic
link.

Version-Release number of selected component (if applicable):

        Doesn't Affect: RHEL2.1 no support for --script
        Doesn't Affect: RHEL3 ditto
        Affects: RHEL4
        Affects: RHEL5
        Affects: FC5
        Affects: FC6

Steps to Reproduce:
1. ln -s '$(touch /tmp/gotya; echo kwak)' malicious
2. serve that file via ftp and attempt to download it with lftp via mirror --script
3. Try to run the resulting script with lftp -f
  
Actual results:

The downloaded file will point to "kwak", while file /tmp/gotya will be
created.

Additional info:

The security implications are questionable, as is the usefullness of the
--script feature itself.