--- libelwix/src/net.c	2019/09/24 15:49:52	1.20
+++ libelwix/src/net.c	2020/05/27 15:03:28	1.21
@@ -3,7 +3,7 @@
 *  by Michael Pounov <misho@elwix.org>
 *
 * $Author: misho $
-* $Id: net.c,v 1.20 2019/09/24 15:49:52 misho Exp $
+* $Id: net.c,v 1.21 2020/05/27 15:03:28 misho Exp $
 *
 **************************************************************************
 The ELWIX and AITNET software is distributed under the following
@@ -12,7 +12,7 @@ terms:
 All of the documentation and software included in the ELWIX and AITNET
 Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>
 
-Copyright 2004 - 2019
+Copyright 2004 - 2020
 	by Michael Pounov <misho@elwix.org>.  All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
@@ -778,3 +778,72 @@ e_getlinkbyether(const ether_addr_t * __restrict mac, 
 	return a;
 }
 #endif
+
+/*
+ * e_network() - Get network from address string
+ *
+ * @csAddr = Address string with CIDR mask /xx
+ * @net = Network information structure
+ * return: -1 error, 1 nothing for return or 0 ok
+ */
+int
+e_network(const char *csAddr, netaddr_t * __restrict net)
+{
+	int ret = 0;
+	u_char mask = 0;
+	inaddr_t a;
+	char *pos, szAddr[STRSIZ];
+	register int i;
+
+	if (!csAddr || !net)
+		return -1;
+	else
+		strlcpy(szAddr, csAddr, sizeof szAddr);
+
+	memset(net, 0, sizeof(netaddr_t));
+
+	pos = strrchr(szAddr, '/');
+	if (pos) {
+		*pos++ = 0;
+		mask = (u_char) strtol(pos, NULL, 10);
+	} else
+		return 1;
+
+	if (strchr(szAddr, ':')) {
+		if (mask > 128)
+			return -1;
+		else {
+			for (i = 0; i < 4 && (mask / 32); i++, mask -= 32)
+				net->mask.in6.__u6_addr.__u6_addr32[i] = 0xFFFFFFFF;
+			if (mask)
+				net->mask.in6.__u6_addr.__u6_addr32[i] = E_CIDRMASK(mask % 32);
+		}
+
+		inet_pton(AF_INET6, szAddr, &a.in6);
+
+#ifndef __linux__
+		net->addr.sin6.sin6_len = sizeof net->addr.sin6;
+#endif
+		for (i = 0; i < 4; i++)
+			net->addr.sin6.sin6_addr.__u6_addr.__u6_addr32[i] = 
+				a.in6.__u6_addr.__u6_addr32[i] & net->mask.in6.__u6_addr.__u6_addr32[i];
+	} else {
+		if (mask > 32)
+			return -1;
+		else {
+			if (mask == 32)
+				net->mask.in.s_addr = 0xFFFFFFFF;
+			else
+				net->mask.in.s_addr = E_CIDRMASK(mask);
+		}
+
+		inet_pton(AF_INET, szAddr, &a.in4);
+
+#ifndef __linux__
+		net->addr.sin.sin_len = sizeof net->addr.sin;
+#endif
+		net->addr.sin.sin_addr.s_addr = a.in.s_addr & net->mask.in.s_addr;
+	}
+
+	return ret;
+}