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/* Copyright (C) 2007-2010 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 Breno Silva <breno.silva@gmail.com>
*
* Implements the gid keyword
*/
#include "suricata-common.h"
#include "suricata.h"
#include "decode.h"
#include "detect.h"
#include "detect-engine.h"
#include "detect-parse.h"
#include "flow-var.h"
#include "decode-events.h"
#include "detect-gid.h"
#include "util-unittest.h"
#include "util-debug.h"
#define PARSE_REGEX "[0-9]+"
static int DetectGidSetup (DetectEngineCtx *, Signature *, char *);
/**
* \brief Registration function for gid: keyword
*/
void DetectGidRegister (void)
{
sigmatch_table[DETECT_GID].name = "gid";
sigmatch_table[DETECT_GID].desc = "give different groups of signatures another id value";
sigmatch_table[DETECT_GID].url = "https://redmine.openinfosecfoundation.org/projects/suricata/wiki/Meta-settings#Gid-group-id";
sigmatch_table[DETECT_GID].Match = NULL;
sigmatch_table[DETECT_GID].Setup = DetectGidSetup;
sigmatch_table[DETECT_GID].Free = NULL;
sigmatch_table[DETECT_GID].RegisterTests = GidRegisterTests;
}
/**
* \internal
* \brief this function is used to add the parsed gid into the current signature
*
* \param de_ctx pointer to the Detection Engine Context
* \param s pointer to the Current Signature
* \param rawstr pointer to the user provided gid options
*
* \retval 0 on Success
* \retval -1 on Failure
*/
static int DetectGidSetup (DetectEngineCtx *de_ctx, Signature *s, char *rawstr)
{
char *str = rawstr;
char duped = 0;
/* Strip leading and trailing "s. */
if (rawstr[0] == '\"') {
str = SCStrdup(rawstr + 1);
if (unlikely(str == NULL)) {
return -1;
}
if (strlen(str) && str[strlen(str) - 1] == '\"') {
str[strlen(str) - 1] = '\"';
}
duped = 1;
}
unsigned long gid = 0;
char *endptr = NULL;
gid = strtoul(rawstr, &endptr, 10);
if (endptr == NULL || *endptr != '\0') {
SCLogError(SC_ERR_INVALID_SIGNATURE, "invalid character as arg "
"to gid keyword");
goto error;
}
if (gid >= UINT_MAX) {
SCLogError(SC_ERR_INVALID_NUMERIC_VALUE, "gid value to high, max %u", UINT_MAX);
goto error;
}
s->gid = (uint32_t)gid;
if (duped)
SCFree(str);
return 0;
error:
if (duped)
SCFree(str);
return -1;
}
/*
* ONLY TESTS BELOW THIS COMMENT
*/
#ifdef UNITTESTS
/**
* \test GidTestParse01 is a test for a valid gid value
*
* \retval 1 on succces
* \retval 0 on failure
*/
static int GidTestParse01 (void)
{
int result = 0;
Signature *s = NULL;
DetectEngineCtx *de_ctx = DetectEngineCtxInit();
if (de_ctx == NULL)
goto end;
s = DetectEngineAppendSig(de_ctx, "alert tcp 1.2.3.4 any -> any any (sid:1; gid:1;)");
if (s == NULL || s->gid != 1)
goto end;
result = 1;
end:
if (de_ctx != NULL)
DetectEngineCtxFree(de_ctx);
return result;
}
/**
* \test GidTestParse02 is a test for an invalid gid value
*
* \retval 1 on succces
* \retval 0 on failure
*/
static int GidTestParse02 (void)
{
int result = 0;
DetectEngineCtx *de_ctx = DetectEngineCtxInit();
if (de_ctx == NULL)
goto end;
if (DetectEngineAppendSig(de_ctx, "alert tcp 1.2.3.4 any -> any any (sid:1; gid:a;)") != NULL)
goto end;
result = 1;
end:
if (de_ctx != NULL)
DetectEngineCtxFree(de_ctx);
return result;
}
/**
* \test Test a gid consisting of a single quote.
*
* \retval 1 on succces
* \retval 0 on failure
*/
static int GidTestParse03 (void)
{
int result = 0;
DetectEngineCtx *de_ctx = DetectEngineCtxInit();
if (de_ctx == NULL)
goto end;
if (DetectEngineAppendSig(de_ctx,
"alert tcp any any -> any any (content:\"ABC\"; gid:\";)") != NULL)
goto end;
result = 1;
end:
if (de_ctx != NULL)
DetectEngineCtxFree(de_ctx);
return result;
}
#endif /* UNITTESTS */
/**
* \brief this function registers unit tests for Gid
*/
void GidRegisterTests(void)
{
#ifdef UNITTESTS
UtRegisterTest("GidTestParse01", GidTestParse01, 1);
UtRegisterTest("GidTestParse02", GidTestParse02, 1);
UtRegisterTest("GidTestParse03", GidTestParse03, 1);
#endif /* UNITTESTS */
}
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