--- libaitio/src/bpf.c	2013/06/24 09:22:41	1.1.2.1
+++ libaitio/src/bpf.c	2013/06/24 11:09:55	1.1.2.2
@@ -1,3 +1,90 @@
 #include "global.h"
 
 
+/*
+ * io_get1stiface() - Get first interface of host
+ *
+ * @szIface = interface string buffer
+ * @iflen = size of interface buffer
+ * return: -1 error or 0 ok
+ */
+int
+io_get1stiface(char *szIface, int iflen)
+{
+	struct ifaddrs *ifa;
+
+	if (!szIface || !iflen)
+		return -1;
+
+	getifaddrs(&ifa);
+	strlcpy(szIface, ifa->ifa_name, iflen);
+	freeifaddrs(ifa);
+	return 0;
+}
+
+/*
+ * io_etherClose() - Close BPF interface
+ *
+ * @eth = bpf handle
+ * return: none
+ */
+void
+io_etherClose(int eth)
+{
+	if (eth > STDERR_FILENO)
+		close(eth);
+}
+
+/*
+ * io_etherOpen() - Open BPF interface to device
+ *
+ * @csIface = interface name
+ * @flags = open flags
+ * return: -1 error or >-1 bpf handle
+ */
+int
+io_etherOpen(const char *csIface, int flags)
+{
+	int n = 1, eth = -1;
+	register int i;
+	char szStr[STRSIZ];
+	struct ifreq ifr;
+
+	for (i = 0; i < BPF_DEV_MAX; i++) {
+		memset(szStr, 0, sizeof szStr);
+		snprintf(szStr, sizeof szStr, "/dev/bpf%d", i);
+		eth = open(szStr, flags);
+		if (eth > STDERR_FILENO)
+			break;
+	}
+	if (eth < 3) {
+		LOGERR;
+		return -1;
+	}
+
+	if (ioctl(eth, BIOCIMMEDIATE, &n) == -1) {
+		LOGERR;
+		close(eth);
+		return -1;
+	}
+	n = USHRT_MAX + 1;
+	if (ioctl(eth, BIOCSBLEN, &n) == -1) {
+		LOGERR;
+		close(eth);
+		return -1;
+	}
+	if (csIface)
+		strlcpy(szStr, csIface, sizeof szStr);
+	else if (io_get1stiface(szStr, sizeof szStr) == -1) {
+		close(eth);
+		return -1;
+	}
+	strlcpy(ifr.ifr_name, szStr, sizeof ifr.ifr_name);
+	if (ioctl(eth, BIOCSETIF, &ifr) == -1) {
+		LOGERR;
+		close(eth);
+		return -1;
+	}
+
+	return eth;
+}