+/* ipv4.c
+ *
+ * IPv4 address class. They understand how to take netmasks into consideration
+ * during equivalence testing.
+ *
+ * Gilbert Ramirez <gram@xiexie.org>
+ *
+ * $Id: ipv4.c,v 1.1 1999/11/15 06:32:14 gram Exp $
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@unicom.net>
+ * Copyright 1998 Gerald Combs
+ *
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <glib.h>
+#include <stdio.h>
+
+#ifdef HAVE_NETINET_IN_H
+# include <netinet/in.h>
+#endif
+
+#include "ipv4.h"
+
+static guint32 create_nmask(gint net_bits);
+
+ipv4_addr*
+ipv4_addr_new(void)
+{
+ ipv4_addr *ipv4;
+
+ ipv4 = g_new(ipv4_addr, 1);
+ return ipv4;
+}
+
+void
+ipv4_addr_free(ipv4_addr *ipv4)
+{
+ if (ipv4)
+ g_free(ipv4);
+}
+
+void
+ipv4_addr_set_host_order_addr(ipv4_addr *ipv4, guint32 new_addr)
+{
+ ipv4->addr = new_addr;
+}
+
+void
+ipv4_addr_set_net_order_addr(ipv4_addr *ipv4, guint32 new_addr)
+{
+ ipv4->addr = ntohl(new_addr);
+}
+
+void
+ipv4_addr_set_netmask_bits(ipv4_addr *ipv4, guint new_nmask_bits)
+{
+/* ipv4->nmask_bits = new_nmask_bits;*/
+ ipv4->nmask = create_nmask(new_nmask_bits);
+}
+
+guint32
+ipv4_get_net_order_addr(ipv4_addr *ipv4)
+{
+ return htonl(ipv4->addr);
+}
+
+guint32
+ipv4_get_host_order_addr(ipv4_addr *ipv4)
+{
+ return ipv4->addr;
+}
+
+
+static guint32
+create_nmask(gint net_bits)
+{
+ static guint32 bitmasks[33] = {
+ 0x00000000,
+ 0x80000000, 0xc0000000, 0xe0000000, 0xf0000000,
+ 0xf8000000, 0xfc000000, 0xfe000000, 0xff000000,
+ 0xff800000, 0xffc00000, 0xffe00000, 0xfff00000,
+ 0xfff80000, 0xfffc0000, 0xfffe0000, 0xffff0000,
+ 0xffff8000, 0xffffc000, 0xffffe000, 0xfffff000,
+ 0xfffff800, 0xfffffc00, 0xfffffe00, 0xffffff00,
+ 0xffffff80, 0xffffffc0, 0xffffffe0, 0xfffffff0,
+ 0xfffffff8, 0xfffffffc, 0xfffffffe, 0xffffffff,
+ };
+
+ g_assert(net_bits <= 32);
+
+ return bitmasks[net_bits];
+}
+
+
+
+/*
+ * w.x.y.z/32 eq w.x.y.0/24 TRUE
+ */
+
+/* Returns TRUE if equal, FALSE if not */
+gboolean
+ipv4_addr_eq(ipv4_addr *a, ipv4_addr *b)
+{
+ guint32 val_a, val_b, nmask;
+
+ nmask = MIN(a->nmask, b->nmask);
+ val_a = a->addr & nmask;
+ val_b = b->addr & nmask;
+ return (val_a == val_b);
+}
+
+gboolean
+ipv4_addr_gt(ipv4_addr *a, ipv4_addr *b)
+{
+ guint32 val_a, val_b, nmask;
+
+ nmask = MIN(a->nmask, b->nmask);
+ val_a = a->addr & nmask;
+ val_b = b->addr & nmask;
+
+ return (val_a > val_b);
+}
+
+gboolean
+ipv4_addr_ge(ipv4_addr *a, ipv4_addr *b)
+{
+ guint32 val_a, val_b, nmask;
+
+ nmask = MIN(a->nmask, b->nmask);
+ val_a = a->addr & nmask;
+ val_b = b->addr & nmask;
+
+ return (val_a >= val_b);
+}
+
+gboolean
+ipv4_addr_lt(ipv4_addr *a, ipv4_addr *b)
+{
+ guint32 val_a, val_b, nmask;
+
+ nmask = MIN(a->nmask, b->nmask);
+ val_a = a->addr & nmask;
+ val_b = b->addr & nmask;
+
+ return (val_a < val_b);
+}
+
+gboolean
+ipv4_addr_le(ipv4_addr *a, ipv4_addr *b)
+{
+ guint32 val_a, val_b, nmask;
+
+ nmask = MIN(a->nmask, b->nmask);
+ val_a = a->addr & nmask;
+ val_b = b->addr & nmask;
+
+ return (val_a <= val_b);
+}
git.samba.org / obnox / wireshark / wip.git / commitdiff