mirror of https://github.com/OISF/suricata
detect/template2: template with prefilter (copy of ttl)
Victor Julien
7 years ago
parent
4d0fc67560
commit
486054595a
@ -0,0 +1,383 @@
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/* Copyright (C) 2007-2018 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 XXX
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*
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*/
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#include "suricata-common.h"
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#include "detect.h"
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#include "detect-parse.h"
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#include "detect-engine-prefilter-common.h"
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#include "detect-template2.h"
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/**
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* \brief Regex for parsing our options
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*/
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#define PARSE_REGEX "^\\s*([0-9]*)?\\s*([<>=-]+)?\\s*([0-9]+)?\\s*$"
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static pcre *parse_regex;
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static pcre_extra *parse_regex_study;
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/* prototypes */
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static int DetectTemplate2Match (ThreadVars *, DetectEngineThreadCtx *, Packet *,
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const Signature *, const SigMatchCtx *);
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static int DetectTemplate2Setup (DetectEngineCtx *, Signature *, const char *);
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void DetectTemplate2Free (void *);
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#ifdef UNITTESTS
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void DetectTemplate2RegisterTests (void);
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#endif
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static int PrefilterSetupTemplate2(DetectEngineCtx *de_ctx, SigGroupHead *sgh);
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static _Bool PrefilterTemplate2IsPrefilterable(const Signature *s);
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/**
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* \brief Registration function for template2: keyword
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*/
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void DetectTemplate2Register(void)
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{
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sigmatch_table[DETECT_TEMPLATE2].name = "template2";
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sigmatch_table[DETECT_TEMPLATE2].desc = "TODO describe the keyword";
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sigmatch_table[DETECT_TEMPLATE2].url = DOC_URL DOC_VERSION "/rules/header-keywords.html#template2";
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sigmatch_table[DETECT_TEMPLATE2].Match = DetectTemplate2Match;
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sigmatch_table[DETECT_TEMPLATE2].Setup = DetectTemplate2Setup;
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sigmatch_table[DETECT_TEMPLATE2].Free = DetectTemplate2Free;
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#ifdef UNITTESTS
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sigmatch_table[DETECT_TEMPLATE2].RegisterTests = DetectTemplate2RegisterTests;
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#endif
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sigmatch_table[DETECT_TEMPLATE2].SupportsPrefilter = PrefilterTemplate2IsPrefilterable;
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sigmatch_table[DETECT_TEMPLATE2].SetupPrefilter = PrefilterSetupTemplate2;
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DetectSetupParseRegexes(PARSE_REGEX, &parse_regex, &parse_regex_study);
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return;
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}
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static inline int Template2Match(const uint8_t parg, const uint8_t mode,
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const uint8_t darg1, const uint8_t darg2)
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{
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if (mode == DETECT_TEMPLATE2_EQ && parg == darg1)
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return 1;
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else if (mode == DETECT_TEMPLATE2_LT && parg < darg1)
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return 1;
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else if (mode == DETECT_TEMPLATE2_GT && parg > darg1)
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return 1;
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else if (mode == DETECT_TEMPLATE2_RA && (parg > darg1 && parg < darg2))
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return 1;
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return 0;
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}
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/**
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* \brief This function is used to match TEMPLATE2 rule option on a packet with those passed via template2:
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*
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* \param t pointer to thread vars
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* \param det_ctx pointer to the pattern matcher thread
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* \param p pointer to the current packet
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* \param m pointer to the sigmatch that we will cast into DetectTemplate2Data
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*
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* \retval 0 no match
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* \retval 1 match
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*/
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static int DetectTemplate2Match (ThreadVars *t, DetectEngineThreadCtx *det_ctx, Packet *p,
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const Signature *s, const SigMatchCtx *ctx)
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{
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if (PKT_IS_PSEUDOPKT(p))
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return 0;
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/* TODO replace this */
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uint8_t ptemplate2;
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if (PKT_IS_IPV4(p)) {
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ptemplate2 = IPV4_GET_IPTTL(p);
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} else if (PKT_IS_IPV6(p)) {
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ptemplate2 = IPV6_GET_HLIM(p);
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} else {
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SCLogDebug("Packet is of not IPv4 or IPv6");
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return 0;
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}
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const DetectTemplate2Data *template2d = (const DetectTemplate2Data *)ctx;
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return Template2Match(ptemplate2, template2d->mode, template2d->arg1, template2d->arg2);
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}
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/**
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* \brief This function is used to parse template2 options passed via template2: keyword
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*
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* \param template2str Pointer to the user provided template2 options
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*
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* \retval template2d pointer to DetectTemplate2Data on success
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* \retval NULL on failure
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*/
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static DetectTemplate2Data *DetectTemplate2Parse (const char *template2str)
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{
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DetectTemplate2Data *template2d = NULL;
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char *arg1 = NULL;
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char *arg2 = NULL;
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char *arg3 = NULL;
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#define MAX_SUBSTRINGS 30
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int ret = 0, res = 0;
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int ov[MAX_SUBSTRINGS];
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ret = pcre_exec(parse_regex, parse_regex_study, template2str, strlen(template2str), 0, 0, ov, MAX_SUBSTRINGS);
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if (ret < 2 || ret > 4) {
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SCLogError(SC_ERR_PCRE_MATCH, "parse error, ret %" PRId32 "", ret);
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goto error;
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}
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const char *str_ptr;
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res = pcre_get_substring((char *) template2str, ov, MAX_SUBSTRINGS, 1, &str_ptr);
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if (res < 0) {
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SCLogError(SC_ERR_PCRE_GET_SUBSTRING, "pcre_get_substring failed");
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goto error;
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}
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arg1 = (char *) str_ptr;
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SCLogDebug("Arg1 \"%s\"", arg1);
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if (ret >= 3) {
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res = pcre_get_substring((char *) template2str, ov, MAX_SUBSTRINGS, 2, &str_ptr);
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if (res < 0) {
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SCLogError(SC_ERR_PCRE_GET_SUBSTRING, "pcre_get_substring failed");
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goto error;
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}
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arg2 = (char *) str_ptr;
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SCLogDebug("Arg2 \"%s\"", arg2);
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if (ret >= 4) {
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res = pcre_get_substring((char *) template2str, ov, MAX_SUBSTRINGS, 3, &str_ptr);
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if (res < 0) {
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SCLogError(SC_ERR_PCRE_GET_SUBSTRING, "pcre_get_substring failed");
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goto error;
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}
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arg3 = (char *) str_ptr;
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SCLogDebug("Arg3 \"%s\"", arg3);
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}
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}
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template2d = SCMalloc(sizeof (DetectTemplate2Data));
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if (unlikely(template2d == NULL))
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goto error;
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template2d->arg1 = 0;
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template2d->arg2 = 0;
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if (arg2 != NULL) {
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/*set the values*/
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switch(arg2[0]) {
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case '<':
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if (arg3 == NULL)
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goto error;
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template2d->mode = DETECT_TEMPLATE2_LT;
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template2d->arg1 = (uint8_t) atoi(arg3);
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SCLogDebug("template2 is %"PRIu8"",template2d->arg1);
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if (strlen(arg1) > 0)
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goto error;
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break;
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case '>':
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if (arg3 == NULL)
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goto error;
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template2d->mode = DETECT_TEMPLATE2_GT;
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template2d->arg1 = (uint8_t) atoi(arg3);
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SCLogDebug("template2 is %"PRIu8"",template2d->arg1);
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if (strlen(arg1) > 0)
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goto error;
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break;
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case '-':
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if (arg1 == NULL || strlen(arg1)== 0)
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goto error;
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if (arg3 == NULL || strlen(arg3)== 0)
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goto error;
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template2d->mode = DETECT_TEMPLATE2_RA;
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template2d->arg1 = (uint8_t) atoi(arg1);
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template2d->arg2 = (uint8_t) atoi(arg3);
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SCLogDebug("template2 is %"PRIu8" to %"PRIu8"",template2d->arg1, template2d->arg2);
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if (template2d->arg1 >= template2d->arg2) {
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SCLogError(SC_ERR_INVALID_SIGNATURE, "Invalid template2 range. ");
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goto error;
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}
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break;
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default:
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template2d->mode = DETECT_TEMPLATE2_EQ;
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if ((arg2 != NULL && strlen(arg2) > 0) ||
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(arg3 != NULL && strlen(arg3) > 0) ||
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(arg1 == NULL ||strlen(arg1) == 0))
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goto error;
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template2d->arg1 = (uint8_t) atoi(arg1);
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break;
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}
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} else {
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template2d->mode = DETECT_TEMPLATE2_EQ;
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if ((arg3 != NULL && strlen(arg3) > 0) ||
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(arg1 == NULL ||strlen(arg1) == 0))
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goto error;
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template2d->arg1 = (uint8_t) atoi(arg1);
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}
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SCFree(arg1);
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SCFree(arg2);
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SCFree(arg3);
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return template2d;
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error:
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if (template2d)
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SCFree(template2d);
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if (arg1)
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SCFree(arg1);
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if (arg2)
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SCFree(arg2);
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if (arg3)
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SCFree(arg3);
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return NULL;
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}
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/**
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* \brief this function is used to atemplate2d the parsed template2 data into the current signature
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*
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* \param de_ctx pointer to the Detection Engine Context
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* \param s pointer to the Current Signature
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* \param template2str pointer to the user provided template2 options
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*
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* \retval 0 on Success
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* \retval -1 on Failure
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*/
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static int DetectTemplate2Setup (DetectEngineCtx *de_ctx, Signature *s, const char *template2str)
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{
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DetectTemplate2Data *template2d = DetectTemplate2Parse(template2str);
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if (template2d == NULL)
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return -1;
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SigMatch *sm = SigMatchAlloc();
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if (sm == NULL) {
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DetectTemplate2Free(template2d);
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return -1;
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}
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sm->type = DETECT_TEMPLATE2;
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sm->ctx = (SigMatchCtx *)template2d;
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SigMatchAppendSMToList(s, sm, DETECT_SM_LIST_MATCH);
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s->flags |= SIG_FLAG_REQUIRE_PACKET;
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return 0;
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}
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/**
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* \brief this function will free memory associated with DetectTemplate2Data
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*
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* \param ptr pointer to DetectTemplate2Data
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*/
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void DetectTemplate2Free(void *ptr)
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{
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DetectTemplate2Data *template2d = (DetectTemplate2Data *)ptr;
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SCFree(template2d);
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}
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/* prefilter code */
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static void
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PrefilterPacketTemplate2Match(DetectEngineThreadCtx *det_ctx, Packet *p, const void *pectx)
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{
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if (PKT_IS_PSEUDOPKT(p)) {
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SCReturn;
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}
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uint8_t ptemplate2;
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/* TODO update */
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if (PKT_IS_IPV4(p)) {
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ptemplate2 = IPV4_GET_IPTTL(p);
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} else if (PKT_IS_IPV6(p)) {
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ptemplate2 = IPV6_GET_HLIM(p);
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} else {
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SCLogDebug("Packet is of not IPv4 or IPv6");
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return;
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}
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/* during setup Suricata will automatically see if there is another
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* check that can be added: alproto, sport or dport */
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const PrefilterPacketHeaderCtx *ctx = pectx;
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if (PrefilterPacketHeaderExtraMatch(ctx, p) == FALSE)
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return;
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/* if we match, add all the sigs that use this prefilter. This means
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* that these will be inspected further */
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if (Template2Match(ptemplate2, ctx->v1.u8[0], ctx->v1.u8[1], ctx->v1.u8[2]))
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{
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SCLogDebug("packet matches template2/hl %u", ptemplate2);
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PrefilterAddSids(&det_ctx->pmq, ctx->sigs_array, ctx->sigs_cnt);
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}
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}
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static void
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PrefilterPacketTemplate2Set(PrefilterPacketHeaderValue *v, void *smctx)
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{
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const DetectTemplate2Data *a = smctx;
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v->u8[0] = a->mode;
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v->u8[1] = a->arg1;
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v->u8[2] = a->arg2;
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}
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static _Bool
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PrefilterPacketTemplate2Compare(PrefilterPacketHeaderValue v, void *smctx)
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{
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const DetectTemplate2Data *a = smctx;
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if (v.u8[0] == a->mode &&
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v.u8[1] == a->arg1 &&
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v.u8[2] == a->arg2)
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return TRUE;
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return FALSE;
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}
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static int PrefilterSetupTemplate2(DetectEngineCtx *de_ctx, SigGroupHead *sgh)
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{
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return PrefilterSetupPacketHeader(de_ctx, sgh, DETECT_TEMPLATE2,
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PrefilterPacketTemplate2Set,
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PrefilterPacketTemplate2Compare,
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PrefilterPacketTemplate2Match);
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}
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static _Bool PrefilterTemplate2IsPrefilterable(const Signature *s)
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{
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const SigMatch *sm;
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for (sm = s->init_data->smlists[DETECT_SM_LIST_MATCH] ; sm != NULL; sm = sm->next) {
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switch (sm->type) {
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case DETECT_TEMPLATE2:
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return TRUE;
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}
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}
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return FALSE;
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}
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#ifdef UNITTESTS
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#include "tests/detect-template2.c"
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#endif
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@ -0,0 +1,42 @@
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/* Copyright (C) 2007-2018 Open Information Security Foundation
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*
|
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* 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
|
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* 02110-1301, USA.
|
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*/
|
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|
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/**
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* \file
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*
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* \author XXX
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*/
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#ifndef _DETECT_TEMPLATE2_H
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#define _DETECT_TEMPLATE2_H
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#define DETECT_TEMPLATE2_LT 0 /**< "less than" operator */
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#define DETECT_TEMPLATE2_EQ 1 /**< "equals" operator (default) */
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#define DETECT_TEMPLATE2_GT 2 /**< "greater than" operator */
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#define DETECT_TEMPLATE2_RA 3 /**< "range" operator */
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typedef struct DetectTemplate2Data_ {
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uint8_t arg1; /**< first arg value in the signature*/
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uint8_t arg2; /**< second arg value in the signature, in case of range
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operator*/
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uint8_t mode; /**< operator used in the signature */
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} DetectTemplate2Data;
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void DetectTemplate2Register(void);
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#endif /* _DETECT_TEMPLATE2_H */
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@ -0,0 +1,155 @@
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/* Copyright (C) 2007-2018 Open Information Security Foundation
|
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*
|
||||
* 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.
|
||||
*/
|
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|
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#include "../suricata-common.h"
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#include "../detect.h"
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#include "../detect-parse.h"
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#include "../detect-engine-prefilter-common.h"
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#include "../detect-template2.h"
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#include "../util-unittest.h"
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/**
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* \test DetectTemplate2ParseTest01 is a test for setting up an valid template2 value.
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*/
|
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|
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static int DetectTemplate2ParseTest01 (void)
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{
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DetectTemplate2Data *template2d = DetectTemplate2Parse("10");
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FAIL_IF_NULL(template2d);
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FAIL_IF_NOT(template2d->arg1 == 10);
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FAIL_IF_NOT(template2d->mode == DETECT_TEMPLATE2_EQ);
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|
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DetectTemplate2Free(template2d);
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|
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PASS;
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}
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|
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/**
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* \test DetectTemplate2ParseTest02 is a test for setting up an valid template2 value with
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* "<" operator.
|
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*/
|
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|
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static int DetectTemplate2ParseTest02 (void)
|
||||
{
|
||||
DetectTemplate2Data *template2d = DetectTemplate2Parse("<10");
|
||||
|
||||
FAIL_IF_NULL(template2d);
|
||||
FAIL_IF_NOT(template2d->arg1 == 10);
|
||||
FAIL_IF_NOT(template2d->mode == DETECT_TEMPLATE2_LT);
|
||||
|
||||
DetectTemplate2Free(template2d);
|
||||
|
||||
PASS;
|
||||
}
|
||||
|
||||
/**
|
||||
* \test DetectTemplate2ParseTest03 is a test for setting up an valid template2 values with
|
||||
* "-" operator.
|
||||
*/
|
||||
|
||||
static int DetectTemplate2ParseTest03 (void)
|
||||
{
|
||||
DetectTemplate2Data *template2d = DetectTemplate2Parse("1-2");
|
||||
|
||||
FAIL_IF_NULL(template2d);
|
||||
FAIL_IF_NOT(template2d->arg1 == 1);
|
||||
FAIL_IF_NOT(template2d->mode == DETECT_TEMPLATE2_RA);
|
||||
|
||||
DetectTemplate2Free(template2d);
|
||||
|
||||
PASS;
|
||||
}
|
||||
|
||||
/**
|
||||
* \test DetectTemplate2ParseTest04 is a test for setting up an valid template2 value with
|
||||
* ">" operator and include spaces arround the given values.
|
||||
*/
|
||||
|
||||
static int DetectTemplate2ParseTest04 (void)
|
||||
{
|
||||
DetectTemplate2Data *template2d = DetectTemplate2Parse(" > 10 ");
|
||||
|
||||
FAIL_IF_NULL(template2d);
|
||||
FAIL_IF_NOT(template2d->arg1 == 10);
|
||||
FAIL_IF_NOT(template2d->mode == DETECT_TEMPLATE2_GT);
|
||||
|
||||
DetectTemplate2Free(template2d);
|
||||
|
||||
PASS;
|
||||
}
|
||||
|
||||
/**
|
||||
* \test DetectTemplate2ParseTest05 is a test for setting up an valid template2 values with
|
||||
* "-" operator and include spaces arround the given values.
|
||||
*/
|
||||
|
||||
static int DetectTemplate2ParseTest05 (void)
|
||||
{
|
||||
DetectTemplate2Data *template2d = DetectTemplate2Parse(" 1 - 2 ");
|
||||
|
||||
FAIL_IF_NULL(template2d);
|
||||
FAIL_IF_NOT(template2d->arg1 == 1);
|
||||
FAIL_IF_NOT(template2d->arg2 == 2);
|
||||
FAIL_IF_NOT(template2d->mode == DETECT_TEMPLATE2_RA);
|
||||
|
||||
DetectTemplate2Free(template2d);
|
||||
|
||||
PASS;
|
||||
}
|
||||
|
||||
/**
|
||||
* \test DetectTemplate2ParseTest06 is a test for setting up an valid template2 values with
|
||||
* invalid "=" operator and include spaces arround the given values.
|
||||
*/
|
||||
|
||||
static int DetectTemplate2ParseTest06 (void)
|
||||
{
|
||||
DetectTemplate2Data *template2d = DetectTemplate2Parse(" 1 = 2 ");
|
||||
FAIL_IF_NOT_NULL(template2d);
|
||||
PASS;
|
||||
}
|
||||
|
||||
/**
|
||||
* \test DetectTemplate2ParseTest07 is a test for setting up an valid template2 values with
|
||||
* invalid "<>" operator and include spaces arround the given values.
|
||||
*/
|
||||
|
||||
static int DetectTemplate2ParseTest07 (void)
|
||||
{
|
||||
DetectTemplate2Data *template2d = DetectTemplate2Parse(" 1<>2 ");
|
||||
FAIL_IF_NOT_NULL(template2d);
|
||||
PASS;
|
||||
}
|
||||
|
||||
/**
|
||||
* \brief this function registers unit tests for DetectTemplate2
|
||||
*/
|
||||
void DetectTemplate2RegisterTests(void)
|
||||
{
|
||||
UtRegisterTest("DetectTemplate2ParseTest01", DetectTemplate2ParseTest01);
|
||||
UtRegisterTest("DetectTemplate2ParseTest02", DetectTemplate2ParseTest02);
|
||||
UtRegisterTest("DetectTemplate2ParseTest03", DetectTemplate2ParseTest03);
|
||||
UtRegisterTest("DetectTemplate2ParseTest04", DetectTemplate2ParseTest04);
|
||||
UtRegisterTest("DetectTemplate2ParseTest05", DetectTemplate2ParseTest05);
|
||||
UtRegisterTest("DetectTemplate2ParseTest06", DetectTemplate2ParseTest06);
|
||||
UtRegisterTest("DetectTemplate2ParseTest07", DetectTemplate2ParseTest07);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue