5.18.4. Class StackingProvider

Instances of the StackingProvider class are policies that define which remote stacking backend a particular service uses to inspect the contents of the traffic.

Example 5.43. A simple StackingProvider class

The following class creates a simple stacking provider that can be referenced in service definitions. The remote host that provides the stacking services is located under the 192.168.12.12 IP address. 

StackingProvider(name="demo_stackingprovider", backend=RemoteStackingBackend(addrs=(SockAddrInet('192.168.12.12', 1318),)))
Example 5.44. Using a StackingProvider in an FTP proxy

The following classes define a stacking provider that can be accesses a local CF instance using a domain socket. This service provider is then used to filter FTP traffic. The configuration of the CF (i.e., what modules it uses to filter the traffic is not discussed here). 

class StackingFtpProxy(FtpProxy):
def config(self):
    super(StackingFtpProxy, self).config()
    self.request_stack["RETR"]=(FTP_STK_DATA, (V_STACK_PROVIDER, "demo_stackingprovider", "default_rulegroup"))

StackingProvider(name="demo_stackingprovider_socket", backend=RemoteStackingBackend(addrs=(SockAddrUnix('/var/run/vcf/vcf.sock'),)))
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