[Pdns-users] mongodb backend

[José Arthur Benetasso Villanova]

Hi all.

The problem is that both pdns and mongodb exports same functions with
different implementations:

[ze at reality pdns]$ LD_DEBUG=bindings LD_LIBRARY_PATH=$PWD/lib/
sbin/pdns_server 2>&1 | grep md5_
     16113:     binding file /usr/lib64/libmongoclient.so [0] to
/usr/lib64/libmongoclient.so [0]: normal symbol `_Z11do_md5_testv'
     16113:     binding file /usr/lib64/libmongoclient.so [0] to
sbin/pdns_server [0]: normal symbol `md5_finish'
     16113:     binding file /usr/lib64/libmongoclient.so [0] to
/usr/lib64/libmongoclient.so [0]: normal symbol `md5_append'
     16113:     binding file /usr/lib64/libmongoclient.so [0] to
/usr/lib64/libmongoclient.so [0]: normal symbol `md5_init'

mongodb uses all but md5_finish from it's code.

What I did sometime ago was to change polarssl visibility to make the
backend work, but it's mot wise change polarssl to make mongobackend work.


diff --git a/pdns/ext/polarssl-1.1.1/library/Makefile
b/pdns/ext/polarssl-1.1.1/library/Makefile
index 26de4d7..2f7cdc6 100644
--- a/pdns/ext/polarssl-1.1.1/library/Makefile
+++ b/pdns/ext/polarssl-1.1.1/library/Makefile
@@ -1,7 +1,7 @@

 # Also see "include/polarssl/config.h"

-CFLAGS += -I../include -D_FILE_OFFSET_BITS=64 -Wall -W
-Wdeclaration-after-statement
+CFLAGS += -I../include -D_FILE_OFFSET_BITS=64 -Wall -W
-Wdeclaration-after-statement -fvisibility=hidden
 OFLAGS = -O


Not sure the best route to solve this problem, maybe mongodb should not
export md5 functions.



On Mon, May 27, 2013 at 2:54 AM, Aki Tuomi <cmouse at youzen.ext.b2.fi> wrote:

> Until this issue is resolved, you could run pipe or remotebackend script to
> utilize mongodb. I would, however, suggest you wait for 3.3RC1 before using
> remotebackend as it doesn't really work before that.
>
> Aki Tuomi
>
> On Sun, May 26, 2013 at 11:44:04PM +0200, fredrik danerklint wrote:
> > I'm the author for the mongodb backend.
> >
> > It was me who told Peter and Bert to delete the backend from PowerDNS.
> >
> > The reason for this was simple. When the client of Mongodb
> > (libmongoclient.a) initialize, it will run through a number of
> > internal test to see that everything is ok. One of those tests is to
> > check for a MD5 sum. This will fail with an assert if you would try
> > it, since
> > libmongoclient.a will call the function in PowerDNS with the same name,
> > but with differents parameters, so the result will not be the
> > expected, and therefor will terminate with an assert.
> >
> >
> > >Hello. What happened with mongodb backend? Why nobody cares of it?
> > >Is that posible to revert it into official status of supported backends?
> > --
> > //fredan
> >
> >
> > _______________________________________________
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> > Pdns-users at mailman.powerdns.com
> > http://mailman.powerdns.com/mailman/listinfo/pdns-users
> >
>
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>


-- 
José Arthur Benetasso Villanova
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