forked from osmocom/wireshark
172 lines
3.5 KiB
C
172 lines
3.5 KiB
C
/* ipv4.c
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*
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* IPv4 address class. They understand how to take netmasks into consideration
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* during equivalence testing.
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*
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* Gilbert Ramirez <gram@alumni.rice.edu>
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <stdio.h>
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#include "ipv4.h"
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#include "packet.h" /* for ip_to_str */
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ipv4_addr*
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ipv4_addr_new(void)
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{
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ipv4_addr *ipv4;
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ipv4 = g_new(ipv4_addr, 1);
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return ipv4;
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}
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void
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ipv4_addr_free(ipv4_addr *ipv4)
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{
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g_free(ipv4);
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}
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void
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ipv4_addr_set_host_order_addr(ipv4_addr *ipv4, guint32 new_addr)
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{
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ipv4->addr = new_addr;
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}
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void
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ipv4_addr_set_net_order_addr(ipv4_addr *ipv4, guint32 new_addr)
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{
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ipv4->addr = g_ntohl(new_addr);
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}
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void
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ipv4_addr_set_netmask_bits(ipv4_addr *ipv4, guint new_nmask_bits)
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{
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static guint32 bitmasks[33] = {
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0x00000000,
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0x80000000, 0xc0000000, 0xe0000000, 0xf0000000,
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0xf8000000, 0xfc000000, 0xfe000000, 0xff000000,
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0xff800000, 0xffc00000, 0xffe00000, 0xfff00000,
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0xfff80000, 0xfffc0000, 0xfffe0000, 0xffff0000,
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0xffff8000, 0xffffc000, 0xffffe000, 0xfffff000,
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0xfffff800, 0xfffffc00, 0xfffffe00, 0xffffff00,
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0xffffff80, 0xffffffc0, 0xffffffe0, 0xfffffff0,
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0xfffffff8, 0xfffffffc, 0xfffffffe, 0xffffffff,
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};
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g_assert(new_nmask_bits <= 32);
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ipv4->nmask = bitmasks[new_nmask_bits];
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}
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guint32
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ipv4_get_net_order_addr(ipv4_addr *ipv4)
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{
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return g_htonl(ipv4->addr);
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}
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guint32
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ipv4_get_host_order_addr(ipv4_addr *ipv4)
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{
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return ipv4->addr;
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}
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/* We're assuming the buffer is at least MAX_IP_STR_LEN (16 bytes) */
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void
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ipv4_addr_str_buf(const ipv4_addr *ipv4, gchar *buf)
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{
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guint32 ipv4_host_order = g_htonl(ipv4->addr);
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ip_to_str_buf((guint8*)&ipv4_host_order, buf, MAX_IP_STR_LEN);
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}
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/*
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* w.x.y.z/32 eq w.x.y.0/24 TRUE
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*/
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/* Returns TRUE if equal, FALSE if not */
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gboolean
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ipv4_addr_eq(ipv4_addr *a, ipv4_addr *b)
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{
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guint32 val_a, val_b, nmask;
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nmask = MIN(a->nmask, b->nmask);
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val_a = a->addr & nmask;
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val_b = b->addr & nmask;
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return (val_a == val_b);
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}
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gboolean
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ipv4_addr_gt(ipv4_addr *a, ipv4_addr *b)
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{
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guint32 val_a, val_b, nmask;
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nmask = MIN(a->nmask, b->nmask);
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val_a = a->addr & nmask;
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val_b = b->addr & nmask;
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return (val_a > val_b);
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}
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gboolean
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ipv4_addr_ge(ipv4_addr *a, ipv4_addr *b)
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{
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guint32 val_a, val_b, nmask;
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nmask = MIN(a->nmask, b->nmask);
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val_a = a->addr & nmask;
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val_b = b->addr & nmask;
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return (val_a >= val_b);
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}
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gboolean
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ipv4_addr_lt(ipv4_addr *a, ipv4_addr *b)
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{
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guint32 val_a, val_b, nmask;
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nmask = MIN(a->nmask, b->nmask);
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val_a = a->addr & nmask;
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val_b = b->addr & nmask;
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return (val_a < val_b);
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}
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gboolean
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ipv4_addr_le(ipv4_addr *a, ipv4_addr *b)
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{
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guint32 val_a, val_b, nmask;
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nmask = MIN(a->nmask, b->nmask);
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val_a = a->addr & nmask;
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val_b = b->addr & nmask;
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return (val_a <= val_b);
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}
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