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pluginhandling.cpp

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/********************************************************************
Description: Plugin-handling library
part of the 3Dsia project
created: xandi, 270200

History:
    date,   name,       changes,                    in funtion
    180300  StonedBones cleaned source
    270200  Xandi       created source

********************************************************************/

#include <stdio.h>
#include <dlfcn.h>
#include <string>
#include <dirent.h>
#include <unistd.h>
#include <sys/stat.h>

#include "plugin.h"
#include "pluginhandling.h"
#include "../common/config.h"
#include "../common/options.h"

FEPList* FEPhead;
APList* APhead;

/*...................................................................
Description: Loads a plugin
Args: pointer to filename
Returns: true on success
Created: StonedBon, ??0200
[ToDo:]
Comments:   - i actually don't like the use of different lists. (so FEPList, APList.)
            I'll change that soon.. xandi, 270200
Changes:    - added support for more types of plugins, xandi
            - added debug ifdefs :), xandi
-------------------------------------------------------------------*/
bool add_plugin (char* filename)
    {
    typedef void *(*pfnPlugIn)(void);
    pfnPlugIn  getPlugIn;
    void      *handler;


#ifdef DEBUG
    fprintf ( stderr, "\nloading shared library" );
#endif
    if ( ( handler = dlopen (filename, RTLD_NOW ) ) != NULL ) // dynamic loading of the plugin
        {
        if ( ( getPlugIn = (pfnPlugIn)dlsym ( handler, "GetFrontEndPlugin" ) ) != NULL ) // search for the function
            {
            FEPList* tmp;

            if (FEPhead == NULL)
                {
                FEPhead     = new FEPList;
                tmp         = FEPhead;
                }
            else
                {
                tmp = FEPhead;

                while (tmp->next != NULL) tmp = tmp->next;

                tmp->next       = new FEPList;
                tmp             = tmp->next;
                }

            tmp->plug   = (FrontEndPlugin *) getPlugIn ();
            tmp->id     = tmp->plug->id;
            tmp->active = true; //this _has_ to be false in near future, when the plugins can be
                                //selected using a frontend. Then the default _has_ to be false, and
                                //LoadAllPlugins() looks into the config file to decide which plugins
                                //will be turned on., xandi
            tmp->next   = NULL;
            }

        else if ( ( getPlugIn = (pfnPlugIn)dlsym ( handler, "GetAuthenticationPlugin" ) ) != NULL )
            {


            }
        else
            {
            dlclose ( handler );
            return false;
            }

        return true;
        }
    else
        {
#ifdef DEBUG
        fprintf ( stderr, "- failed!\n");
        fprintf ( stderr, "Error: %s\n", dlerror() );
#endif
        return false;
        }
    }


/*...................................................................
Description: Gets all plugins in a directory
Args: pointer to directoryname
Returns: nothing
Created: xandi, 270200
[ToDo:]
Comments:
Changes:
-------------------------------------------------------------------*/
void get_plugins ( char *dirname )
    {
    string filename;

    DIR *dir;

    struct dirent *dent;
    struct stat statbuf;

    dir = opendir(dirname);

    if (dir)
        {
        while ( ( dent = readdir ( dir ) ) != NULL )
            {
            filename = dirname;
            filename += "/";
            filename += dent->d_name;

            if ( !stat ( filename.c_str (), &statbuf ) )
                {
                if ( S_ISREG ( statbuf.st_mode ) ) {
                    if (filename.rfind (".so") != string::npos )
                        add_plugin (const_cast<char*>(filename.c_str()));
                    }
                }
            }
        }
    }




/*...................................................................
Description: Loads all plugins stored in the directories defined in the config file
Args: none
Returns: nothing
Created: xandi, 270200
ToDo: lots :)
      lookup in config-file to decide which plugins are to be activated

[Comments:]
Changes:
-------------------------------------------------------------------*/
void LoadAllPlugins ( void )
    {
    get_plugins (SERVER_PLUGIN_DIR);
    }

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