64 lines
1.6 KiB
ReStructuredText
64 lines
1.6 KiB
ReStructuredText
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Response modification
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=====================
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This example shows how to modify the response produced by the ``iterator`` module.
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As soon as the iterator module returns the response, we :
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1. invalidate the data in cache
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2. modify the response *TTL*
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3. rewrite the data in cache
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4. return modified packet
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Note that the steps 1 and 3 are neccessary only in case, the python module is the first module in the processing chain.
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In other cases, the validator module guarantees updating data which are produced by iterator module.
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Complete source code
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--------------------
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.. literalinclude:: ../../examples/resmod.py
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:language: python
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Testing
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-------
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Run Unbound server:
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``root@localhost>unbound -dv -c ./test-resmod.conf``
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Issue a query for name ending with "nic.cz."
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``>>>dig A @127.0.0.1 www.nic.cz``
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::
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;; global options: printcmd
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;; Got answer:
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;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 48831
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;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 5
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;; QUESTION SECTION:
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;www.nic.cz. IN A
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;; ANSWER SECTION:
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www.nic.cz. 10 IN A 217.31.205.50
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;; AUTHORITY SECTION:
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nic.cz. 10 IN NS e.ns.nic.cz.
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nic.cz. 10 IN NS a.ns.nic.cz.
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nic.cz. 10 IN NS c.ns.nic.cz.
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;; ADDITIONAL SECTION:
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a.ns.nic.cz. 10 IN A 217.31.205.180
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a.ns.nic.cz. 10 IN AAAA 2001:1488:dada:176::180
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c.ns.nic.cz. 10 IN A 195.66.241.202
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c.ns.nic.cz. 10 IN AAAA 2a01:40:1000::2
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e.ns.nic.cz. 10 IN A 194.146.105.38
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;; Query time: 166 msec
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;; SERVER: 127.0.0.1#53(127.0.0.1)
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;; WHEN: Mon Jan 02 13:39:43 2009
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;; MSG SIZE rcvd: 199
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As you can see, TTL of all the records is set to 10.
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