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
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/* parser.h
*
* This file contains the prototypes of all the parsers available within impcap.
*
* File begun on 2018-11-13
*
* Created by:
* - Théo Bertin (theo.bertin@advens.fr)
*
* With:
* - François Bernard (francois.bernard@isen.yncrea.fr)
* - Tianyu Geng (tianyu.geng@isen.yncrea.fr)
*
* This file is part of rsyslog.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
* -or-
* see COPYING.ASL20 in the source distribution
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <stdarg.h>
#include <ctype.h>
#include <pcap.h>
#include "rsyslog.h"
#include "msg.h"
#include "dirty.h"
#ifdef __FreeBSD__
#include <sys/socket.h>
#else
#include <netinet/ether.h>
#endif
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <netinet/ip_icmp.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <net/ethernet.h>
#include <arpa/inet.h>
#ifndef INCLUDED_PARSER_H
#define INCLUDED_PARSER_H 1
/* data return structure */
struct data_ret_s {
size_t size;
char *pData;
};
typedef struct data_ret_s data_ret_t;
#define RETURN_DATA_AFTER(x) data_ret_t *retData = malloc(sizeof(data_ret_t)); \
if(pktSize > x) { \
retData->size = pktSize - x; \
retData->pData = (char *)packet + x; \
} \
else { \
retData->size = 0; \
retData->pData = NULL; \
} \
return retData; \
/* --- handlers prototypes --- */
void packet_parse(uchar *arg, const struct pcap_pkthdr *pkthdr, const uchar *packet);
data_ret_t *eth_parse(const uchar *packet, int pktSize, struct json_object *jparent);
data_ret_t *llc_parse(const uchar *packet, int pktSize, struct json_object *jparent);
data_ret_t *ipx_parse(const uchar *packet, int pktSize, struct json_object *jparent);
data_ret_t *ipv4_parse(const uchar *packet, int pktSize, struct json_object *jparent);
data_ret_t *icmp_parse(const uchar *packet, int pktSize, struct json_object *jparent);
data_ret_t *tcp_parse(const uchar *packet, int pktSize, struct json_object *jparent);
data_ret_t *udp_parse(const uchar *packet, int pktSize, struct json_object *jparent);
data_ret_t *ipv6_parse(const uchar *packet, int pktSize, struct json_object *jparent);
data_ret_t *arp_parse(const uchar *packet, int pktSize, struct json_object *jparent);
data_ret_t *rarp_parse(const uchar *packet, int pktSize, struct json_object *jparent);
data_ret_t *ah_parse(const uchar *packet, int pktSize, struct json_object *jparent);
data_ret_t *esp_parse(const uchar *packet, int pktSize, struct json_object *jparent);
data_ret_t *smb_parse(const uchar *packet, int pktSize, struct json_object *jparent);
data_ret_t *ftp_parse(const uchar *packet, int pktSize, struct json_object *jparent);
data_ret_t *http_parse(const uchar *packet, int pktSize, struct json_object *jparent);
data_ret_t *dns_parse(const uchar *packet, int pktSize, struct json_object *jparent);
// inline function definitions
static inline data_ret_t *dont_parse(
const uchar *packet,
int pktSize,
__attribute__((unused)) struct json_object *jparent);
static inline data_ret_t *eth_proto_parse(
uint16_t ethProto,
const uchar *packet,
int pktSize,
struct json_object *jparent);
static inline data_ret_t *ip_proto_parse(
uint16_t ipProto,
const uchar *packet,
int pktSize,
struct json_object *jparent);
/*
* Mock function to do no parsing when protocol is not a valid number
*/
static inline data_ret_t *dont_parse(
const uchar *packet,
int pktSize,
__attribute__((unused)) struct json_object *jparent)
{
DBGPRINTF("protocol not handled\n");
RETURN_DATA_AFTER(0)
}
// proto code handlers
static inline data_ret_t *eth_proto_parse(
uint16_t ethProto,
const uchar *packet,
int pktSize,
struct json_object *jparent)
{
switch(ethProto) {
case ETHERTYPE_IP:
return ipv4_parse(packet, pktSize, jparent);
case ETHERTYPE_IPV6:
return ipv6_parse(packet, pktSize, jparent);
case ETHERTYPE_ARP:
return arp_parse(packet, pktSize, jparent);
case ETHERTYPE_REVARP:
return rarp_parse(packet, pktSize, jparent);
case ETHERTYPE_IPX:
return ipx_parse(packet, pktSize, jparent);
default:
return dont_parse(packet, pktSize, jparent);
}
}
static inline data_ret_t *ip_proto_parse(
uint16_t ipProto,
const uchar *packet,
int pktSize,
struct json_object *jparent)
{
switch(ipProto) {
case IPPROTO_TCP:
return tcp_parse(packet, pktSize, jparent);
case IPPROTO_UDP:
return udp_parse(packet, pktSize, jparent);
case IPPROTO_ICMP:
return icmp_parse(packet, pktSize, jparent);
default:
return dont_parse(packet, pktSize, jparent);
}
}
#endif /* INCLUDED_PARSER_H */
|
