module.c

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/*----------------------------------------------------------------------------
 secwatch - Copyright (C) 2006 Nic Stevens -- See COPYING for license details
------------------------------------------------------------------------------
 module.c - implement module loading and initialization 
-----------------------------------------------------------------------------*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <dlfcn.h>
#include <strutil.h>
#include <configfile.h>
#include <hooks.h>
#include <log.h>

typedef int (*modfn_t)(void *,int, char **);

typedef struct _moditem {
     char * modname;
     char ** modargs;
     void * modhand;
     modfn_t entry;
} moditem_t;

moditem_t **mods = NULL;
int modcnt = 0;

void * moddata[] = {config,writeLog,inform,addLogHook,addLoopHook,NULL};

int loadModule(char * aptr,char *ebuf, size_t ebsiz) {
     void *handle;
     modfn_t modfunc;
     char **argv, * modpath, *module, *error;
     int argc, mp;
     moditem_t x;
     
     if((argv = split(" ",aptr)) == NULL) 
          return -1;
     argc = count(argv);
     module = argv[0];
     if((handle = dlopen(module,RTLD_LAZY)) == NULL) {
          snprintf(ebuf,ebsiz,"module=%s, dlerror: %s",module,dlerror());
          return -1;
     }
     dlerror();
     *(void **)(&modfunc) = dlsym(handle,"secwmodinit");
     if((error = dlerror()) != NULL) {
          snprintf(ebuf,ebsiz,"module=%s, dlerror: %s",module,dlerror());
          return -1;
     }
     x.modname = module;
     x.modargs = argv;
     x.modhand = handle;
     x.entry = modfunc;

     mp = modcnt++;
     if((mods = realloc(mods,(sizeof(moditem_t *)*modcnt))) == NULL) {
          snprintf(ebuf,ebsiz,"Cannot load module %s: No space for module table",module);
          return -1;
     }
     if((mods[mp] = (moditem_t *) calloc(sizeof(moditem_t),1)) == NULL) {
          snprintf(ebuf,ebsiz,"Cannot load module %s: No space for module table entry",module);
          return -1;
     }
     *mods[mp] = x;

     modfunc(moddata,argc,argv);
     return 0;
}

     

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