Initial checkin

getifaddr.c

@@ -0,0 +1,55 @@
+/* $Id$ */
+/* MiniUPnP project
+ * http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
+ * (c) 2006 Thomas Bernard 
+ * This software is subject to the conditions detailed
+ * in the LICENCE file provided within the distribution */
+
+#include <string.h>
+#include <syslog.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <net/if.h>
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#if defined(sun)
+#include <sys/sockio.h>
+#endif
+
+#include "getifaddr.h"
+
+int
+getifaddr(const char * ifname, char * buf, int len)
+{
+	/* SIOCGIFADDR struct ifreq *  */
+	int s;
+	struct ifreq ifr;
+	int ifrlen;
+	struct sockaddr_in * addr;
+	ifrlen = sizeof(ifr);
+	s = socket(PF_INET, SOCK_DGRAM, 0);
+	if(s < 0)
+	{
+		syslog(LOG_ERR, "socket(PF_INET, SOCK_DGRAM): %m");
+		return -1;
+	}
+	strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
+	if(ioctl(s, SIOCGIFADDR, &ifr, &ifrlen) < 0)
+	{
+		syslog(LOG_ERR, "ioctl(s, SIOCGIFADDR, ...): %m");
+		close(s);
+		return -1;
+	}
+	addr = (struct sockaddr_in *)&ifr.ifr_addr;
+	if(!inet_ntop(AF_INET, &addr->sin_addr, buf, len))
+	{
+		syslog(LOG_ERR, "inet_ntop(): %m");
+		close(s);
+		return -1;
+	}
+	close(s);
+	return 0;
+}
+