suricata
util-detect.c
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1 /* Copyright (C) 2017 Open Information Security Foundation
2  *
3  * You can copy, redistribute or modify this Program under the terms of
4  * the GNU General Public License version 2 as published by the Free
5  * Software Foundation.
6  *
7  * This program is distributed in the hope that it will be useful,
8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10  * GNU General Public License for more details.
11  *
12  * You should have received a copy of the GNU General Public License
13  * version 2 along with this program; if not, write to the Free Software
14  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
15  * 02110-1301, USA.
16  */
17 
18 /**
19  * \file
20  *
21  * \author Giuseppe Longo <glongo@stamus-networks.com>
22  *
23  * Detection engine helper functions
24  */
25 
26 #include "suricata-common.h"
27 #include "suricata.h"
28 #include "detect.h"
29 #include "util-detect.h"
30 
31 /**
32  * \brief Allocate SigString list member
33  *
34  * \retval Pointer to SigString
35  */
37 {
38  SigString *sigstr = SCCalloc(1, sizeof(SigString));
39  if (unlikely(sigstr == NULL))
40  return NULL;
41 
42  sigstr->line = 0;
43 
44  return sigstr;
45 }
46 
47 /**
48  * \brief Assigns the filename, signature, lineno to SigString list member
49  *
50  * \param sig pointer to SigString
51  * \param sig_file filename that contains the signature
52  * \param sig_str signature in string format
53  * \param sig_error signature parsing error
54  * \param line line line number
55  *
56  * \retval 1 on success 0 on failure
57  */
58 static int SigStringAddSig(SigString *sig, const char *sig_file,
59  const char *sig_str, const char *sig_error,
60  int line)
61 {
62  if (sig_file == NULL || sig_str == NULL) {
63  return 0;
64  }
65 
66  sig->filename = SCStrdup(sig_file);
67  if (sig->filename == NULL) {
68  SCLogError(SC_ERR_MEM_ALLOC, "Error allocating memory");
69  return 0;
70  }
71 
72  sig->sig_str = SCStrdup(sig_str);
73  if (sig->sig_str == NULL) {
74  SCLogError(SC_ERR_MEM_ALLOC, "Error allocating memory");
75  SCFree(sig->filename);
76  return 0;
77  }
78 
79  if (sig_error) {
80  sig->sig_error = SCStrdup(sig_error);
81  if (sig->sig_error == NULL) {
82  SCLogError(SC_ERR_MEM_ALLOC, "Error allocating memory");
83  SCFree(sig->filename);
84  SCFree(sig->sig_str);
85  return 0;
86  }
87  }
88 
89  sig->line = line;
90 
91  return 1;
92 }
93 
94 /**
95  * \brief Append a new list member to SigString list
96  *
97  * \param list pointer to the start of the SigString list
98  * \param sig_file filename that contains the signature
99  * \param sig_str signature in string format
100  * \param line line line number
101  *
102  * \retval 1 on success 0 on failure
103  */
104 int SigStringAppend(SigFileLoaderStat *sig_stats, const char *sig_file,
105  const char *sig_str, const char *sig_error, int line)
106 {
107  SigString *item = SigStringAlloc();
108  if (item == NULL) {
109  return 0;
110  }
111 
112  if (!SigStringAddSig(item, sig_file, sig_str, sig_error, line)) {
113  SCFree(item);
114  return 0;
115  }
116 
117  TAILQ_INSERT_TAIL(&sig_stats->failed_sigs, item, next);
118 
119  return 1;
120 }
struct HtpBodyChunk_ * next
Signature loader statistics.
Definition: detect.h:688
#define unlikely(expr)
Definition: util-optimize.h:35
#define SCCalloc(nm, a)
Definition: util-mem.h:205
#define SCLogError(err_code,...)
Macro used to log ERROR messages.
Definition: util-debug.h:294
char * filename
Definition: detect.h:680
int SigStringAppend(SigFileLoaderStat *sig_stats, const char *sig_file, const char *sig_str, const char *sig_error, int line)
Append a new list member to SigString list.
Definition: util-detect.c:104
#define TAILQ_INSERT_TAIL(head, elm, field)
Definition: queue.h:385
char * sig_error
Definition: detect.h:682
#define SCFree(a)
Definition: util-mem.h:236
SigString * SigStringAlloc(void)
Allocate SigString list member.
Definition: util-detect.c:36
int line
Definition: detect.h:683
#define SCStrdup(a)
Definition: util-mem.h:220
char * sig_str
Definition: detect.h:681