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Simple uniform random number generator using boost.

At this moment, it is in asiolink, because that is where it is used. It should be moved to a lib/util (or something), together with the non-uniform nsas rng.

Also note that IOFetch now *sets* a random qid, but does not actually check it when it receives an answer.

previous commit changed the methods that had unused parameters (rather than disabling the check in multiple places)

* Extend logging in IOFetch (and add message definitions)
* Update buffer size setting for UDP socket
* remove spaces at end of lines in other files

Replaced with IOFetch with a protocol selection of UDP.

IOFetch is a general upstream "fetch" class that should be able to
operate over TCP or UDP.  Related changes have been made in the
associated classes.  So far, only the unit tests for a UDP fetch
have been made (and passed).

It only stores the final result, and only looks into the cache at the start of a resolve() call right now, but it appears to work

Admin tasks:
* Split out io_error.h from asiolink.h
* Made test files follow naming convention of main files
* More discriminatory includes in some files
* Updates tests/Makefile.am

Coding tasks:
* Add additional methods to io_socket.* and put in dummies in
  {tcp,udp}_socket.h
* Incorporated basic IO Fetch code from Scott

The test directory now contains test files that used to be in internal/ (where the makefile did have this addition)

Though most of the tests fell into recursive_query_unittest.cc

and moved them out of internal. Changed the internal/ workaround (to prevent files outside of asiolink/ to indirectly include asio.hpp), the .cc files that include the relevant headers must include asio.hpp themselves (and this is checked in the headers)
Also moved coroutine out of internal.
Tests are still todo (which is why internal/ still exists)

asiolink.h is now merely a 'collection' header that includes all the
rest

 - avoid relying on ASIO details in the main test (this is good anyway in
   terms of the original intent of asio link)
 - move internal-dependent tests to internal/tests with a workaround compiler
   flag

Also fixed a potentially common bug: use blocking recv() in recvUDP() with a fail safe timeout.  When compiled with clang++ this test sometimes failed due to the failure of recv(), and after looking at the code closely I found it possible to happen for other environments.


git-svn-id: svn://bind10.isc.org/svn/bind10/branches/trac448@4011 e5f2f494-b856-4b98-b285-d166d9295462

git-svn-id: svn://bind10.isc.org/svn/bind10/branches/trac327@3507 e5f2f494-b856-4b98-b285-d166d9295462

added BOOST_INCLUDES to AM_CPPFLAGS.  this is now necessary wherever we use boost and boost is installed in some uncommon path.


git-svn-id: svn://bind10.isc.org/svn/bind10/branches/trac327@3506 e5f2f494-b856-4b98-b285-d166d9295462

git-svn-id: svn://bind10.isc.org/svn/bind10/branches/vorner-recursor-dummylog@3394 e5f2f494-b856-4b98-b285-d166d9295462

git-svn-id: svn://bind10.isc.org/svn/bind10/branches/trac327@3325 e5f2f494-b856-4b98-b285-d166d9295462

asiolink.cc are now in multiple files (ioaddress.h, iosocket.h, etc).
Also removed some shared_ptr's that weren't really needed in tcpdns
and udpdns.  This work isn't done yet, but committing now to simplify
the review a bit.



git-svn-id: svn://bind10.isc.org/svn/bind10/branches/trac327@3150 e5f2f494-b856-4b98-b285-d166d9295462