Обсуждение: Undefined symbol

Hi,

Im writing a function in C (encode) for PG that uses blowfish encryption
here is how I compile it.

gcc -I/usr/src/postgresql-7.0.3/src/include
-I/usr/src/postgresql-7.0.3/src/backend  -O2 -Wall -Wmissing-prototypes
-Wmissing-declarations -lcrypt
-I/usr/src/postgresql-7.0.3/src/interfaces/libpq
-I/usr/src/postgresql-7.0.3/src/include -fpic
-I/home/boulat/Funio.com/database/libblowfish.a -c -o encode.o
encode.c

it compiles nicely with 0 error or warnings,

then i do
gcc -shared -o encode.so  encode.o
rm encode.o

so now im left we a ready to go encode.so , So now I add that function
to DB

testdb=# CREATE FUNCTION encode(text,text)
testdb-# RETURNS text
testdb-# AS '/home/boulat/Funio.com/database/encode.so'
testdb-# LANGUAGE 'C';
CREATE

no problems there either, BUT ...

testdb=# select encode('bob','bob');
ERROR:  Load of file /home/boulat/Funio.com/database/encode.so failed:
/home/boulat/Funio.com/database/encode.so: undefined symbol:
BF_cfb64_encrypt

thats the function that I call from inside my c code...
but Why??? It compiled with no errors or warning, and I have all the
right includes in my source code.

Im confused!

Any help would be appreciated.

Regards,
Boulat Khakimov

--
Nothing Like the Sun

On Tue, Mar 06, 2001 at 06:44:31PM -0500, Boulat Khakimov wrote:
> Hi,
>
> Im writing a function in C (encode) for PG that uses blowfish encryption
> here is how I compile it.
>
> gcc -I/usr/src/postgresql-7.0.3/src/include
> -I/usr/src/postgresql-7.0.3/src/backend  -O2 -Wall -Wmissing-prototypes
> -Wmissing-declarations -lcrypt
> -I/usr/src/postgresql-7.0.3/src/interfaces/libpq
> -I/usr/src/postgresql-7.0.3/src/include -fpic
> -I/home/boulat/Funio.com/database/libblowfish.a -c -o encode.o
> encode.c

I suspect you want
        ...
    -L/usr/src/postgresql-7.0.3/src/interfaces/
    /home/boulat/Funio.com/database/libblowfish.a -c -o encode -lpq

But I wonder if, libblowfish.a is compiled with position independent
code *and* if libpq is reachable by the backend database.  I don't think
your libblowfish is getting linked into the object.

> it compiles nicely with 0 error or warnings,
>
> then i do
> gcc -shared -o encode.so  encode.o
> rm encode.o
>
> so now im left we a ready to go encode.so , So now I add that function
> to DB
>
> testdb=# CREATE FUNCTION encode(text,text)
> testdb-# RETURNS text
> testdb-# AS '/home/boulat/Funio.com/database/encode.so'
> testdb-# LANGUAGE 'C';
> CREATE
>
> no problems there either, BUT ...
>
> testdb=# select encode('bob','bob');
> ERROR:  Load of file /home/boulat/Funio.com/database/encode.so failed:
> /home/boulat/Funio.com/database/encode.so: undefined symbol:
> BF_cfb64_encrypt
>
> thats the function that I call from inside my c code...
> but Why??? It compiled with no errors or warning, and I have all the
> right includes in my source code.
>
> Im confused!
>
> Any help would be appreciated.
>
> Regards,
> Boulat Khakimov
>
> --
> Nothing Like the Sun
>
> ---------------------------(end of broadcast)---------------------------
> TIP 5: Have you checked our extensive FAQ?
>
> http://www.postgresql.org/users-lounge/docs/faq.html
>

--
Eric G. Miller <egm2@jps.net>

"Eric G. Miller" wrote:
> I suspect you want
>         ...
>         -L/usr/src/postgresql-7.0.3/src/interfaces/
>         /home/boulat/Funio.com/database/libblowfish.a -c -o encode -lpq
>
> But I wonder if, libblowfish.a is compiled with position independent
> code *and* if libpq is reachable by the backend database.  I don't think
> your libblowfish is getting linked into the object.
>


libblofish.a wasnt getting linked to encode.so , I fixed that
now it works w/o a glitch! :)

two way encoding in Postgres using blowfish!!!

If anyone is interested im goin to put a source code on a webpage or
something


Life is good again :P

Regards,
Boulat Khakimov

--- Boulat Khakimov <boulat@inet-interactif.com> wrote:
> "Eric G. Miller" wrote:
> > I suspect you want
> >         ...
> >         -L/usr/src/postgresql-7.0.3/src/interfaces/
> >         /home/boulat/Funio.com/database/libblowfish.a -c -o
> encode -lpq
> >
> > But I wonder if, libblowfish.a is compiled with position
> independent
> > code *and* if libpq is reachable by the backend database.  I
> don't think
> > your libblowfish is getting linked into the object.
> >
>
>
> libblofish.a wasnt getting linked to encode.so , I fixed that
> now it works w/o a glitch! :)
>
> two way encoding in Postgres using blowfish!!!
>
> If anyone is interested im goin to put a source code on a
> webpage or
> something

Encrypted authentication is always good :)  Please provide the
code.  I'm very interested in seeing it.  Thanks.

Brent

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On Tue, Mar 06, 2001 at 06:44:31PM -0500, Boulat Khakimov allegedly wrote:
> testdb=# select encode('bob','bob');
> ERROR:  Load of file /home/boulat/Funio.com/database/encode.so failed:
> /home/boulat/Funio.com/database/encode.so: undefined symbol:
> BF_cfb64_encrypt
>
> thats the function that I call from inside my c code...
> but Why??? It compiled with no errors or warning, and I have all the
> right includes in my source code.
>
> Im confused!

Are you linking against a blowfish library? If so, either include the
encryption functions in your shared object, or load that shared object
yourself. Have a look at the dlopen manpage for more information.

I hope this helps a bit,

Mathijs
--
It's not that perl programmers are idiots, it's that the language
rewards idiotic behavior in a way that no other language or tool has
ever done.
                                                    Erik Naggum