To actually use the defined matchers, they have to be specified in the proper attributes of the particular proxy class. The proxy classes can use matchers for a variety of tasks. The matchers to be used by the particular proxy class can be added as Changed class attributes.

Figure 6.66. Using a matchers in proxy classes

For example, SmtpProxy can use three different matchers: one to check the relayed domains (for example, using a RegexpMatcher), and two SmptInvalidMatchers (one for sender, one for the recipient address verification). For the details of the matchers usable by a given proxy class see the attributes of the class in Chapter 4, Proxies in Proxedo Network Security Suite 1.0 Reference Guide.

Python:
class SmtpMatcherProxy(SmtpProxy):
  relay_domains_matcher="Smtpdomains"
  def config(self):
    SmtpProxy.config(self)

MatcherPolicy(name="Smtpdomains", matcher=RegexpMatcher(match_list=("example.com",),\
 ignore_list=None))