added unbound to external deps

external/unbound/pythonmod/doc/examples/example3.rst

@@ -0,0 +1,63 @@
+Response modification
+=====================
+
+This example shows how to modify the response produced by the ``iterator`` module.
+
+As soon as the iterator module returns the response, we :
+
+1. invalidate the data in cache
+2. modify the response *TTL*
+3. rewrite the data in cache
+4. return modified packet
+
+Note that the steps 1 and 3 are neccessary only in case, the python module is the first module in the processing chain.
+In other cases, the validator module guarantees updating data which are produced by iterator module.
+
+Complete source code
+--------------------
+
+.. literalinclude:: ../../examples/resmod.py
+   :language: python
+
+Testing
+-------
+
+Run Unbound server:
+
+``root@localhost>unbound -dv -c ./test-resmod.conf``
+
+Issue a query for name ending with "nic.cz."
+
+``>>>dig A @127.0.0.1 www.nic.cz``
+
+::
+
+	;; global options:  printcmd
+	;; Got answer:
+	;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 48831
+	;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 5
+	
+	;; QUESTION SECTION:
+	;www.nic.cz.			IN	A
+	
+	;; ANSWER SECTION:
+	www.nic.cz.		10	IN	A	217.31.205.50
+	
+	;; AUTHORITY SECTION:
+	nic.cz.			10	IN	NS	e.ns.nic.cz.
+	nic.cz.			10	IN	NS	a.ns.nic.cz.
+	nic.cz.			10	IN	NS	c.ns.nic.cz.
+	
+	;; ADDITIONAL SECTION:
+	a.ns.nic.cz.		10	IN	A	217.31.205.180
+	a.ns.nic.cz.		10	IN	AAAA	2001:1488:dada:176::180
+	c.ns.nic.cz.		10	IN	A	195.66.241.202
+	c.ns.nic.cz.		10	IN	AAAA	2a01:40:1000::2
+	e.ns.nic.cz.		10	IN	A	194.146.105.38
+	
+	;; Query time: 166 msec
+	;; SERVER: 127.0.0.1#53(127.0.0.1)
+	;; WHEN: Mon Jan 02 13:39:43 2009
+	;; MSG SIZE  rcvd: 199
+
+As you can see, TTL of all the records is set to 10.