nut/tools/nut-scanner/nutscan-init.c

/*
 *  Copyright (C) 2011 - EATON
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

/*! \file nutscan-init.c
    \brief init functions for nut scanner library
    \author Frederic Bohe <fredericbohe@eaton.com>
*/

#include "common.h"
#include <ltdl.h>
#include <unistd.h>
#include <dirent.h>
#include <stdio.h>
#include <string.h>

int nutscan_avail_avahi = 0;
int nutscan_avail_ipmi = 0;
int nutscan_avail_nut = 0;
int nutscan_avail_snmp = 0;
int nutscan_avail_usb = 0;
int nutscan_avail_xml_http = 0;

int nutscan_load_usb_library(const char *libname_path);
int nutscan_load_snmp_library(const char *libname_path);
int nutscan_load_neon_library(const char *libname_path);
int nutscan_load_avahi_library(const char *libname_path);
int nutscan_load_ipmi_library(const char *libname_path);
int nutscan_load_upsclient_library(const char *libname_path);

/* FIXME: would be good to get more from /etc/ld.so.conf[.d] */
char * search_paths[] = {
	LIBDIR,
	"/usr/lib64",
	"/lib64",
	"/usr/lib",
	"/lib",
	"/usr/local/lib",
	NULL
};

const char * get_libname(const char* base_libname)
{
	DIR *dp;
	struct dirent *dirp;
	int index = 0;
	char *libname_path = NULL;
	char current_test_path[LARGEBUF];

	for(index = 0 ; (search_paths[index] != NULL) && (libname_path == NULL) ; index++)
	{
		memset(current_test_path, 0, LARGEBUF);

		if ((dp = opendir(search_paths[index])) == NULL)
			continue;

		while ((dirp = readdir(dp)) != NULL)
		{
			if(!strncmp(dirp->d_name, base_libname, strlen(base_libname))) {
				snprintf(current_test_path, LARGEBUF, "%s/%s", search_paths[index], dirp->d_name);
				libname_path = realpath(current_test_path, NULL);
				if (libname_path != NULL)
					break;
			}
		}
		closedir(dp);
	}
	/* fprintf(stderr,"Looking for lib %s, found %s\n", base_libname, (libname_path!=NULL)?libname_path:"NULL");*/
	return libname_path;
}

void nutscan_init(void)
{
#ifdef WITH_USB
	nutscan_avail_usb = nutscan_load_usb_library(get_libname("libusb-0.1.so"));
#endif
#ifdef WITH_SNMP
	nutscan_avail_snmp = nutscan_load_snmp_library(get_libname("libnetsnmp.so"));
#endif
#ifdef WITH_NEON
	nutscan_avail_xml_http = nutscan_load_neon_library(get_libname("libneon.so"));
#endif
#ifdef WITH_AVAHI
	nutscan_avail_avahi = nutscan_load_avahi_library(get_libname("libavahi-client.so"));
#endif
#ifdef WITH_FREEIPMI
	nutscan_avail_ipmi = nutscan_load_ipmi_library(get_libname("libfreeipmi.so"));
#endif
	nutscan_avail_nut = nutscan_load_upsclient_library(get_libname("libupsclient.so"));
}

void nutscan_free(void)
{
	if( nutscan_avail_usb ) {
		lt_dlexit();
	}
	if( nutscan_avail_snmp ) {
		lt_dlexit();
	}
	if( nutscan_avail_xml_http ) {
		lt_dlexit();
	}
	if( nutscan_avail_avahi ) {
		lt_dlexit();
	}
	if( nutscan_avail_ipmi ) {
		lt_dlexit();
	}
	if( nutscan_avail_nut ) {
		lt_dlexit();
	}
}