netinfo plugin ported from volker_dev (r823)

git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@919 3ae390bd-cb1e-0410-b409-cd5a39f66f1f

1 files changed, 227 insertions, 0 deletions

diff --git a/plugin_netinfo.c b/plugin_netinfo.c
new file mode 100644
index 0000000..143a5e1
--- /dev/null
+++ b/plugin_netinfo.c
@@ -0,0 +1,227 @@
+/* $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)
+{
+    struct ifreq ifreq;
+    double value = 1.0;
+
+    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 {
+	    error("%s: ioctl(FLAGS) failed: %s", "plugin_netinfo", strerror(errno));
+	    return;
+	}
+    }
+
+    /* device exists */
+    SetResult(&result, R_NUMBER, &value);
+}
+
+
+/* get MAC address (hardware address) of network device */
+static void my_hwaddr(RESULT * result, RESULT * arg1)
+{
+    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) {
+	error("%s: ioctl(IFHWADDR) failed: %s", "plugin_netinfo", strerror(errno));
+	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)
+{
+    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) {
+	error("%s: ioctl(IFADDR) failed: %s", "plugin_netinfo", strerror(errno));
+	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)
+{
+    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) {
+	error("%s: ioctl(IFNETMASK) failed: %s", "plugin_netinfo", strerror(errno));
+	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)
+{
+    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) {
+	error("%s: ioctl(IFBRDADDR) failed: %s", "plugin_netinfo", strerror(errno));
+	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);
+}