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113 lines
3.3 KiB
C
113 lines
3.3 KiB
C
/* Copyright (C) 2007-2013 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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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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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/**
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* \file
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*
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* \author Anoop Saldanha <anoopsaldanha@gmail.com>
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* \author Duarte Silva <duarte.silva@serializing.me>
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*
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* IP addresses related utility functions
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*/
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#include "suricata-common.h"
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/**
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* \brief Validates an IPV4 address and returns the network endian arranged
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* version of the IPV4 address
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*
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* \param addr Pointer to a character string containing an IPV4 address. A
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* valid IPV4 address is a character string containing a dotted
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* format of "ddd.ddd.ddd.ddd"
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*
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* \retval Pointer to an in_addr instance containing the network endian format
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* of the IPV4 address
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* \retval NULL if the IPV4 address is invalid
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*/
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struct in_addr *ValidateIPV4Address(const char *addr_str)
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{
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struct in_addr *addr = NULL;
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if ( (addr = SCMalloc(sizeof(struct in_addr))) == NULL) {
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SCLogError(SC_ERR_FATAL, "Fatal error encountered in ValidateIPV4Address. Exiting...");
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exit(EXIT_FAILURE);
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}
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if (inet_pton(AF_INET, addr_str, addr) <= 0) {
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SCFree(addr);
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return NULL;
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}
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return addr;
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}
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/**
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* \brief Validates an IPV6 address and returns the network endian arranged
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* version of the IPV6 addresss
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*
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* \param addr Pointer to a character string containing an IPV6 address
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*
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* \retval Pointer to a in6_addr instance containing the network endian format
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* of the IPV6 address
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* \retval NULL if the IPV6 address is invalid
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*/
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struct in6_addr *ValidateIPV6Address(const char *addr_str)
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{
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struct in6_addr *addr = NULL;
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if ( (addr = SCMalloc(sizeof(struct in6_addr))) == NULL) {
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SCLogError(SC_ERR_FATAL, "Fatal error encountered in ValidateIPV6Address. Exiting...");
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exit(EXIT_FAILURE);
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}
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if (inet_pton(AF_INET6, addr_str, addr) <= 0) {
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SCFree(addr);
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return NULL;
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}
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return addr;
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}
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/**
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* \brief Culls the non-netmask portion of the IP address. For example an IP
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* address 192.168.240.1 would be chopped to 192.168.224.0 against a
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* netmask value of 19.
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*
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* \param stream Pointer the IP address that has to be masked
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* \param netmask The netmask value (cidr) to which the IP address has to be culled
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* \param key_bitlen The bitlen of the stream
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*/
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void MaskIPNetblock(uint8_t *stream, uint8_t netmask, uint16_t key_bitlen)
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{
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int mask = 0;
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int i = 0;
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int bytes = key_bitlen / 8;
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for (i = 0; i < bytes; i++) {
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mask = -1;
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if ( ((i + 1) * 8) > netmask) {
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if ( ((i + 1) * 8 - netmask) < 8)
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mask = -1 << ((i + 1) * 8 - netmask);
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else
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mask = 0;
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}
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stream[i] &= mask;
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}
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return;
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}
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