use CGI;                          # use the CGI.pm module
my $query = CGI->new;             # create a CGI object called "$query"

            # if you actually need all form data in a hash,
            # do this:
my %formdata = $query->Vars;      # get all form data in hash "%formdata".

            # does handle multivalues, although not too well;
            # see the CGI manual on "multivalue" for more on that topic.

my $yip = $query->remote_host;    # get the remote hostname or address

# my $link = $formdata{link};     # one way of getting the link parameter.
my $link = $query->param('link'); # another way of getting the link parameter.