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-rw-r--r--plugin_netinfo.c325
1 files changed, 325 insertions, 0 deletions
diff --git a/plugin_netinfo.c b/plugin_netinfo.c
new file mode 100644
index 0000000..34f694d
--- /dev/null
+++ b/plugin_netinfo.c
@@ -0,0 +1,325 @@
+/* $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> /* memcpy() */
+#include <ctype.h>
+#include <math.h> /* rint(), log2l() */
+
+#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_DGRAM, 0);
+ }
+ if (socknr == -1) {
+ error("%s: socket(PF_INET, SOCK_DGRAM, 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)
+{
+ char buf[10240];
+ struct ifconf ifcnf;
+ struct ifreq *ifreq;
+ int len;
+ double value = 0.0; // netdev doesn't exists
+ char devname[80];
+
+ if (socknr < 0) {
+ /* no open socket */
+ SetResult(&result, R_NUMBER, &value);
+ return;
+ }
+
+ ifcnf.ifc_len = sizeof(buf);
+ ifcnf.ifc_buf = buf;
+ if (ioctl(socknr, SIOCGIFCONF, &ifcnf) < 0) {
+ /* error getting list of devices */
+ error("%s: ioctl(IFCONF) for %s failed: %s", "plugin_netinfo", R2S(arg1), strerror(errno));
+ SetResult(&result, R_NUMBER, &value);
+ return;
+ }
+ if (0 == ifcnf.ifc_len) {
+ /* no interfaces found */
+ SetResult(&result, R_NUMBER, &value);
+ return;
+ }
+
+ ifreq = (struct ifreq *) buf;
+ len = sizeof(struct ifreq);
+ strncpy(devname, R2S(arg1), sizeof(devname));
+
+ while (ifreq && *((char *) ifreq) && ((char *) ifreq) < buf + ifcnf.ifc_len) {
+ if (*((char *) ifreq) && strncmp(ifreq->ifr_name, devname, sizeof(devname)) == 0) {
+ /* found */
+ value = 1.0;
+ SetResult(&result, R_NUMBER, &value);
+ return;
+ }
+
+ (*(char **) &ifreq) += len;
+ }
+
+ /* device doesn't 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));
+#ifndef __MAC_OS_X_VERSION_10_3
+ // Linux: get interface MAC address
+ if (ioctl(socknr, SIOCGIFHWADDR, &ifreq) < 0) {
+#else
+ // MacOS: get interface MAC address
+ if (ioctl(socknr, SIOCGLIFPHYADDR, &ifreq) < 0) {
+#endif
+ errcount++;
+ if (1 == errcount % 1000) {
+ error("%s: ioctl(IF_HARDW_ADDR %s) failed: %s", "plugin_netinfo", ifreq.ifr_name, strerror(errno));
+ error(" (skip next 1000 errors)");
+ }
+ SetResult(&result, R_STRING, "");
+ return;
+ }
+#ifndef __MAC_OS_X_VERSION_10_3
+ hw = (unsigned char *) ifreq.ifr_hwaddr.sa_data;
+#else
+ hw = (unsigned char *) ifreq.ifr_data;
+#endif
+ 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);
+}
+
+
+struct sockaddr_in *get_netmask(RESULT * arg1)
+{
+ static int errcount = 0;
+ struct ifreq ifreq;
+ struct sockaddr_in *sin;
+ static struct sockaddr_in sret;
+
+ 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)");
+ }
+ return NULL;
+ }
+#ifndef __MAC_OS_X_VERSION_10_3
+ sin = (struct sockaddr_in *) &ifreq.ifr_netmask;
+#else
+ sin = (struct sockaddr_in *) &ifreq.ifr_data;
+#endif
+
+ memcpy(&sret, sin, sizeof(sret));
+ return &sret;
+}
+
+/* get ip netmask of network device */
+static void my_netmask(RESULT * result, RESULT * arg1)
+{
+ char value[16];
+ struct sockaddr_in *sin;
+
+ if (socknr < 0) {
+ /* no open socket */
+ SetResult(&result, R_STRING, "");
+ return;
+ }
+
+ sin = get_netmask(arg1);
+ qprintf(value, sizeof(value), "%s", NULL != sin ? inet_ntoa(sin->sin_addr) : "?");
+
+ SetResult(&result, R_STRING, value);
+}
+
+
+/* get netmask in short CIDR notation */
+static void my_netmask_short(RESULT * result, RESULT * arg1)
+{
+ char value[16];
+ struct sockaddr_in *sin;
+ int netlen = 0;
+ long double logval = 0.0;
+
+ if (socknr < 0) {
+ /* no open socket */
+ SetResult(&result, R_STRING, "");
+ return;
+ }
+
+ sin = get_netmask(arg1);
+ if (NULL != sin) {
+ logval = (long double) (get_netmask(arg1)->sin_addr.s_addr);
+ netlen = (int) rint(log2l(logval) / log2l(2.0));
+ qprintf(value, sizeof(value), "/%d", netlen);
+ } else {
+ qprintf(value, sizeof(value), "/?");
+ }
+
+ 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::netmask_short", 1, my_netmask_short);
+ AddFunction("netinfo::bcaddr", 1, my_bcaddr);
+
+ return 0;
+}
+
+void plugin_exit_netinfo(void)
+{
+ close(socknr);
+}
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