1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
/* Copyright (C) 2007-2013 Open Information Security Foundation
*
* You can copy, redistribute or modify this Program under the terms of
* the GNU General Public License version 2 as published by the Free
* Software Foundation.
*
* 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
* version 2 along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/**
* \file
*
* \author Anoop Saldanha <anoopsaldanha@gmail.com>
* \author Duarte Silva <duarte.silva@serializing.me>
*
* IP addresses related utility functions
*/
#include "suricata-common.h"
/**
* \brief Validates an IPV4 address and returns the network endian arranged
* version of the IPV4 address
*
* \param addr Pointer to a character string containing an IPV4 address. A
* valid IPV4 address is a character string containing a dotted
* format of "ddd.ddd.ddd.ddd"
*
* \retval Pointer to an in_addr instance containing the network endian format
* of the IPV4 address
* \retval NULL if the IPV4 address is invalid
*/
struct in_addr *ValidateIPV4Address(const char *addr_str)
{
struct in_addr *addr = NULL;
if ( (addr = SCMalloc(sizeof(struct in_addr))) == NULL) {
SCLogError(SC_ERR_FATAL, "Fatal error encountered in ValidateIPV4Address. Exiting...");
exit(EXIT_FAILURE);
}
if (inet_pton(AF_INET, addr_str, addr) <= 0) {
SCFree(addr);
return NULL;
}
return addr;
}
/**
* \brief Validates an IPV6 address and returns the network endian arranged
* version of the IPV6 addresss
*
* \param addr Pointer to a character string containing an IPV6 address
*
* \retval Pointer to a in6_addr instance containing the network endian format
* of the IPV6 address
* \retval NULL if the IPV6 address is invalid
*/
struct in6_addr *ValidateIPV6Address(const char *addr_str)
{
struct in6_addr *addr = NULL;
if ( (addr = SCMalloc(sizeof(struct in6_addr))) == NULL) {
SCLogError(SC_ERR_FATAL, "Fatal error encountered in ValidateIPV6Address. Exiting...");
exit(EXIT_FAILURE);
}
if (inet_pton(AF_INET6, addr_str, addr) <= 0) {
SCFree(addr);
return NULL;
}
return addr;
}
/**
* \brief Culls the non-netmask portion of the IP address. For example an IP
* address 192.168.240.1 would be chopped to 192.168.224.0 against a
* netmask value of 19.
*
* \param stream Pointer the IP address that has to be masked
* \param netmask The netmask value (cidr) to which the IP address has to be culled
* \param key_bitlen The bitlen of the stream
*/
void MaskIPNetblock(uint8_t *stream, uint8_t netmask, uint16_t key_bitlen)
{
int mask = 0;
int i = 0;
int bytes = key_bitlen / 8;
for (i = 0; i < bytes; i++) {
mask = -1;
if ( ((i + 1) * 8) > netmask) {
if ( ((i + 1) * 8 - netmask) < 8)
mask = -1 << ((i + 1) * 8 - netmask);
else
mask = 0;
}
stream[i] &= mask;
}
return;
}
|
