--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/net.c	Tue Jan 16 09:31:00 2018 -0800
@@ -0,0 +1,49 @@
+#include <sys/types.h>
+#include <ifaddrs.h>
+#include <netinet/in.h>
+#include "net.h"
+
+static uint8_t is_loopback(struct sockaddr_in *addr)
+{
+	return (addr->sin_addr.s_addr & 0xFF) == 127;
+}
+
+static void format_address(uint8_t *dst, struct sockaddr_in *addr)
+{
+	long ip = addr->sin_addr.s_addr;
+	dst[0] = ip;
+	dst[1] = ip >> 8;
+	dst[2] = ip >> 16;
+	dst[3] = ip >> 24;
+}
+
+uint8_t get_host_address(iface_info *out)
+{
+	struct ifaddrs *entries, *current, *localhost;
+	if (getifaddrs(&entries)) {
+		return 0;
+	}
+	
+	for (current = entries; current; current = current->ifa_next)
+	{
+		if (current->ifa_addr && current->ifa_addr->sa_family == AF_INET) {
+			struct sockaddr_in *addr = (struct sockaddr_in *)current->ifa_addr;
+			if (is_loopback(addr)) {
+				localhost = current;
+			} else {
+				break;
+			}
+		}
+	}
+	if (!current && localhost) {
+		current = localhost;
+	}
+	uint8_t ret = 0;
+	if (current) {
+		ret = 1;
+		format_address(out->ip, (struct sockaddr_in *)current->ifa_addr);
+		format_address(out->net_mask, (struct sockaddr_in *)current->ifa_netmask);
+	}
+	freeifaddrs(entries);
+	return ret;
+}
\ No newline at end of file