Re: [mosquitto-dev] Unable to load auth plugin in Ubuntu

[Sunny Leung <sunny.leung@xxxxxxxxxxxxx>]

Hi Roger,

Thank you for your help. As you have already suspected, I have traced the problem to the placement of the linker flag in my Makefile. 

Thanks and keep up the excellent work on mosquitto. 

Best regards,

Sunny

On Monday, September 15, 2014, Roger Light <roger@xxxxxxxxxx> wrote:

Hi Sunny,

It sounds like a symbol isn't being resolved somewhere. Could you make
the modification below (which prints the dlerror error message) and
try again?

Cheers,

Roger


diff -r 54599ddfb603 src/security.c
--- a/src/security.c    Wed Sep 10 16:10:53 2014 +0100
+++ b/src/security.c    Mon Sep 15 12:28:48 2014 +0100
@@ -56,7 +56,7 @@
                lib = LIB_LOAD(db->config->auth_plugin);
                if(!lib){
                        _mosquitto_log_printf(NULL, MOSQ_LOG_ERR,
-                                       "Error: Unable to load auth
plugin \"%s\".", db->config->auth_plugin);
+                                       "Error: Unable to load auth
plugin \"%s\" (%s).", db->config->auth_plugin, dlerror());
                        return 1;
                }


On Mon, Sep 15, 2014 at 9:59 AM, Sunny Leung <sunny.leung@xxxxxxxxxxxxx> wrote:
> Hi,
>
> I have written a test auth plugin which uses the libcurl library to access
> remote server via https. The plugin (shared library) run fine on my Mac but
> having problem when running in a Ubuntu 14 (x64) box.
>
> Mosquitto keeps saying, Unable to load auth plugin.
>
> When I comment out the use of libcurl API, Mosquitto can load the auth
> plugin with no problem. I know it is not purely a Mosquitto related problem,
> but will I be able to get Mosquitto to output more information as to why it
> unable to the auth plugin when it uses libcurl in Ubuntu?
>
> I have compile the auth plugin as shared library (as instructed) with
> '-lcurl' and copy the library to '/usr/lib/x86_64-linux-gnu'
>
> Also executed 'sudo ldconfig' to update the shared library cache.
>
>
> Thanks.
>
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-- 
SL