add libiwinfo (moved from LuCI trunk)

SVN-Revision: 29403

package/iwinfo/src/iwinfo_utils.c

@@ -0,0 +1,126 @@
+/*
+ * iwinfo - Wireless Information Library - Shared utility routines
+ *
+ *   Copyright (C) 2010 Jo-Philipp Wich <xm@subsignal.org>
+ *
+ * The iwinfo library is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * The iwinfo library 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 the iwinfo library. If not, see http://www.gnu.org/licenses/.
+ *
+ * The signal handling code is derived from the official madwifi tools,
+ * wlanconfig.c in particular. The encryption property handling was
+ * inspired by the hostapd madwifi driver.
+ */
+
+#include "iwinfo/utils.h"
+
+
+static int ioctl_socket = -1;
+
+static int iwinfo_ioctl_socket(void)
+{
+	/* Prepare socket */
+	if( ioctl_socket == -1 )
+	{
+		ioctl_socket = socket(AF_INET, SOCK_DGRAM, 0);
+		fcntl(ioctl_socket, F_SETFD, fcntl(ioctl_socket, F_GETFD) | FD_CLOEXEC);
+	}
+
+	return ioctl_socket;
+}
+
+int iwinfo_ioctl(int cmd, void *ifr)
+{
+	int s = iwinfo_ioctl_socket();
+	return ioctl(s, cmd, ifr);
+}
+
+int iwinfo_dbm2mw(int in)
+{
+	double res = 1.0;
+	int ip = in / 10;
+	int fp = in % 10;
+	int k;
+
+	for(k = 0; k < ip; k++) res *= 10;
+	for(k = 0; k < fp; k++) res *= LOG10_MAGIC;
+
+	return (int)res;
+}
+
+int iwinfo_mw2dbm(int in)
+{
+	double fin = (double) in;
+	int res = 0;
+
+	while(fin > 10.0)
+	{
+		res += 10;
+		fin /= 10.0;
+	}
+
+	while(fin > 1.000001)
+	{
+		res += 1;
+		fin /= LOG10_MAGIC;
+	}
+
+	return (int)res;
+}
+
+int iwinfo_ifup(const char *ifname)
+{
+	struct ifreq ifr;
+
+	strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
+
+	if( iwinfo_ioctl(SIOCGIFFLAGS, &ifr) )
+		return 0;
+
+	ifr.ifr_flags |= (IFF_UP | IFF_RUNNING);
+
+	return !iwinfo_ioctl(SIOCSIFFLAGS, &ifr);
+}
+
+int iwinfo_ifdown(const char *ifname)
+{
+	struct ifreq ifr;
+
+	strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
+
+	if( iwinfo_ioctl(SIOCGIFFLAGS, &ifr) )
+		return 0;
+
+	ifr.ifr_flags &= ~(IFF_UP | IFF_RUNNING);
+
+	return !iwinfo_ioctl(SIOCSIFFLAGS, &ifr);
+}
+
+int iwinfo_ifmac(const char *ifname)
+{
+	struct ifreq ifr;
+
+	strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
+
+	if( iwinfo_ioctl(SIOCGIFHWADDR, &ifr) )
+		return 0;
+
+	ifr.ifr_hwaddr.sa_data[1]++;
+	ifr.ifr_hwaddr.sa_data[2]++;
+
+	return !iwinfo_ioctl(SIOCSIFHWADDR, &ifr);
+}
+
+void iwinfo_close(void)
+{
+	if( ioctl_socket > -1 )
+		close(ioctl_socket);
+}