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/* $Id: $
* $URL: $
*
* plugin getting information about network devices (IPaddress, MACaddress, ...)
*
* Copyright (C) 2007 Volker Gering <v.gering@t-online.de>
* Copyright (C) 2004, 2005, 2006, 2007 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
*
* This file is part of LCD4Linux.
*
* LCD4Linux 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, or (at your option)
* any later version.
*
* LCD4Linux 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/*
* exported functions:
*
* int plugin_init_netinfo (void)
* adds functions to get information about network devices
*
*/
#include "config.h"
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include "debug.h"
#include "plugin.h"
#include "qprintf.h"
#include <sys/types.h> /* socket() */
#include <sys/socket.h> /* socket() */
#include <sys/ioctl.h> /* SIOCGIFNAME */
#include <net/if.h> /* ifreq{} */
#include <errno.h> /* errno */
#include <netinet/in.h> /* inet_ntoa() */
#include <arpa/inet.h> /* inet_ntoa() */
/* socket descriptor:
* -2 initial state
* -1 error: message not printed
* -3 error: message printed, deactivate plugin
*/
static int socknr = -2;
static int open_net(void)
{
if (socknr == -3)
return -1;
if (socknr == -2) {
socknr = socket(PF_INET, SOCK_STREAM, 0);
}
if (socknr == -1) {
error("%s: socket(PF_INET, SOCK_STREAM, 0) failed: %s", "plugin_netinfo", strerror(errno));
error(" deactivate plugin netinfo");
socknr = -3;
return -1;
}
return 0;
}
static void my_exists(RESULT * result, RESULT * arg1)
{
static int errcount = 0;
struct ifreq ifreq;
double value = 1.0; // netdev exists
if (socknr < 0) {
/* no open socket */
value = 0.0;
SetResult(&result, R_NUMBER, &value);
return;
}
strncpy(ifreq.ifr_name, R2S(arg1), sizeof(ifreq.ifr_name));
if (ioctl(socknr, SIOCGIFFLAGS, &ifreq) < 0) {
if (errno == ENODEV) {
/* device does not exists */
value = 0.0;
} else {
errcount++;
if (1 == errcount % 1000) {
error("%s: ioctl(FLAGS %s) failed: %s", "plugin_netinfo", ifreq.ifr_name, strerror(errno));
error(" (skip next 1000 errors)");
}
return;
}
}
/* device exists */
SetResult(&result, R_NUMBER, &value);
}
/* get MAC address (hardware address) of network device */
static void my_hwaddr(RESULT * result, RESULT * arg1)
{
static int errcount = 0;
struct ifreq ifreq;
unsigned char *hw;
char value[18];
if (socknr < 0) {
/* no open socket */
SetResult(&result, R_STRING, "");
return;
}
strncpy(ifreq.ifr_name, R2S(arg1), sizeof(ifreq.ifr_name));
if (ioctl(socknr, SIOCGIFHWADDR, &ifreq) < 0) {
errcount++;
if (1 == errcount % 1000) {
error("%s: ioctl(IFHWADDR %s) failed: %s", "plugin_netinfo", ifreq.ifr_name, strerror(errno));
error(" (skip next 1000 errors)");
}
SetResult(&result, R_STRING, "");
return;
}
hw = (unsigned char *) ifreq.ifr_hwaddr.sa_data;
qprintf(value, sizeof(value), "%02x:%02x:%02x:%02x:%02x:%02x",
*hw, *(hw + 1), *(hw + 2), *(hw + 3), *(hw + 4), *(hw + 5));
SetResult(&result, R_STRING, value);
}
/* get ip address of network device */
static void my_ipaddr(RESULT * result, RESULT * arg1)
{
static int errcount = 0;
struct ifreq ifreq;
struct sockaddr_in *sin;
char value[16];
if (socknr < 0) {
/* no open socket */
SetResult(&result, R_STRING, "");
return;
}
strncpy(ifreq.ifr_name, R2S(arg1), sizeof(ifreq.ifr_name));
if (ioctl(socknr, SIOCGIFADDR, &ifreq) < 0) {
errcount++;
if (1 == errcount % 1000) {
error("%s: ioctl(IFADDR %s) failed: %s", "plugin_netinfo", ifreq.ifr_name, strerror(errno));
error(" (skip next 1000 errors)");
}
SetResult(&result, R_STRING, "");
return;
}
sin = (struct sockaddr_in *) &ifreq.ifr_addr;
qprintf(value, sizeof(value), "%s", inet_ntoa(sin->sin_addr));
SetResult(&result, R_STRING, value);
}
/* get ip netmask of network device */
static void my_netmask(RESULT * result, RESULT * arg1)
{
static int errcount = 0;
struct ifreq ifreq;
struct sockaddr_in *sin;
char value[16];
if (socknr < 0) {
/* no open socket */
SetResult(&result, R_STRING, "");
return;
}
strncpy(ifreq.ifr_name, R2S(arg1), sizeof(ifreq.ifr_name));
if (ioctl(socknr, SIOCGIFNETMASK, &ifreq) < 0) {
errcount++;
if (1 == errcount % 1000) {
error("%s: ioctl(IFNETMASK %s) failed: %s", "plugin_netinfo", ifreq.ifr_name, strerror(errno));
error(" (skip next 1000 errors)");
}
SetResult(&result, R_STRING, "");
return;
}
sin = (struct sockaddr_in *) &ifreq.ifr_netmask;
qprintf(value, sizeof(value), "%s", inet_ntoa(sin->sin_addr));
SetResult(&result, R_STRING, value);
}
/* get ip broadcast address of network device */
static void my_bcaddr(RESULT * result, RESULT * arg1)
{
static int errcount = 0;
struct ifreq ifreq;
struct sockaddr_in *sin;
char value[16];
if (socknr < 0) {
/* no open socket */
SetResult(&result, R_STRING, "");
return;
}
strncpy(ifreq.ifr_name, R2S(arg1), sizeof(ifreq.ifr_name));
if (ioctl(socknr, SIOCGIFBRDADDR, &ifreq) < 0) {
errcount++;
if (1 == errcount % 1000) {
error("%s: ioctl(IFBRDADDR %s) failed: %s", "plugin_netinfo", ifreq.ifr_name, strerror(errno));
error(" (skip next 1000 errors)");
}
SetResult(&result, R_STRING, "");
return;
}
sin = (struct sockaddr_in *) &ifreq.ifr_broadaddr;
qprintf(value, sizeof(value), "%s", inet_ntoa(sin->sin_addr));
SetResult(&result, R_STRING, value);
}
int plugin_init_netinfo(void)
{
open_net();
AddFunction("netinfo::exists", 1, my_exists);
AddFunction("netinfo::hwaddr", 1, my_hwaddr);
AddFunction("netinfo::ipaddr", 1, my_ipaddr);
AddFunction("netinfo::netmask", 1, my_netmask);
AddFunction("netinfo::bcaddr", 1, my_bcaddr);
return 0;
}
void plugin_exit_netinfo(void)
{
close(socknr);
}
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