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-rw-r--r--framework/src/suricata/src/detect-mark.c353
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diff --git a/framework/src/suricata/src/detect-mark.c b/framework/src/suricata/src/detect-mark.c
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+/* Copyright (C) 2011 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 Eric Leblond <eric@regit.org>
+ *
+ * Implements the mark keyword. Based on detect-gid
+ * by Breno Silva <breno.silva@gmail.com>
+ */
+
+#include "suricata-common.h"
+#include "suricata.h"
+#include "decode.h"
+#include "detect.h"
+#include "flow-var.h"
+#include "decode-events.h"
+
+#include "detect-mark.h"
+#include "detect-parse.h"
+
+#include "util-unittest.h"
+#include "util-debug.h"
+
+#define PARSE_REGEX "([0x]*[0-9a-f]+)/([0x]*[0-9a-f]+)"
+
+static pcre *parse_regex;
+static pcre_extra *parse_regex_study;
+
+static int DetectMarkSetup (DetectEngineCtx *, Signature *, char *);
+int DetectMarkPacket(ThreadVars *t, DetectEngineThreadCtx *det_ctx, Packet *p, Signature *s, const SigMatchCtx *ctx);
+void DetectMarkDataFree(void *ptr);
+
+/**
+ * \brief Registration function for nfq_set_mark: keyword
+ */
+
+void DetectMarkRegister (void)
+{
+ sigmatch_table[DETECT_MARK].name = "nfq_set_mark";
+ sigmatch_table[DETECT_MARK].Match = DetectMarkPacket;
+ sigmatch_table[DETECT_MARK].Setup = DetectMarkSetup;
+ sigmatch_table[DETECT_MARK].Free = DetectMarkDataFree;
+ sigmatch_table[DETECT_MARK].RegisterTests = MarkRegisterTests;
+
+ const char *eb;
+ int opts = 0;
+ int eo;
+
+ parse_regex = pcre_compile(PARSE_REGEX, opts, &eb, &eo, NULL);
+ if(parse_regex == NULL)
+ {
+ SCLogError(SC_ERR_PCRE_COMPILE, "pcre compile of \"%s\" failed at offset %" PRId32 ": %s", PARSE_REGEX, eo, eb);
+ goto error;
+ }
+
+ parse_regex_study = pcre_study(parse_regex, 0, &eb);
+ if(eb != NULL)
+ {
+ SCLogError(SC_ERR_PCRE_STUDY, "pcre study failed: %s", eb);
+ goto error;
+ }
+
+error:
+ return;
+
+}
+
+#ifdef NFQ
+/**
+ * \internal
+ * \brief This function is used to parse mark options passed via mark: keyword
+ *
+ * \param rawstr Pointer to the user provided mark options
+ *
+ * \retval 0 on success
+ * \retval < 0 on failure
+ */
+static void * DetectMarkParse (char *rawstr)
+{
+ int ret = 0, res = 0;
+#define MAX_SUBSTRINGS 30
+ int ov[MAX_SUBSTRINGS];
+ const char *str_ptr = NULL;
+ char *ptr = NULL;
+ char *endptr = NULL;
+ uint32_t mark;
+ uint32_t mask;
+ DetectMarkData *data;
+
+ ret = pcre_exec(parse_regex, parse_regex_study, rawstr, strlen(rawstr), 0, 0, ov, MAX_SUBSTRINGS);
+ if (ret < 1) {
+ SCLogError(SC_ERR_PCRE_MATCH, "pcre_exec parse error, ret %" PRId32 ", string %s", ret, rawstr);
+ return NULL;
+ }
+
+ res = pcre_get_substring((char *)rawstr, ov, MAX_SUBSTRINGS, 1, &str_ptr);
+ if (res < 0) {
+ SCLogError(SC_ERR_PCRE_GET_SUBSTRING, "pcre_get_substring failed");
+ return NULL;
+ }
+
+ ptr = (char *)str_ptr;
+
+ if (ptr == NULL)
+ return NULL;
+
+ errno = 0;
+ mark = strtoul(ptr, &endptr, 0);
+ if (errno == ERANGE) {
+ SCLogError(SC_ERR_NUMERIC_VALUE_ERANGE, "Numeric value out of range");
+ SCFree(ptr);
+ return NULL;
+ } /* If there is no numeric value in the given string then strtoull(), makes
+ endptr equals to ptr and return 0 as result */
+ else if (endptr == ptr && mark == 0) {
+ SCLogError(SC_ERR_INVALID_NUMERIC_VALUE, "No numeric value");
+ SCFree(ptr);
+ return NULL;
+ } else if (endptr == ptr) {
+ SCLogError(SC_ERR_INVALID_NUMERIC_VALUE, "Invalid numeric value");
+ SCFree(ptr);
+ return NULL;
+ }
+
+ res = pcre_get_substring((char *)rawstr, ov, MAX_SUBSTRINGS, 2, &str_ptr);
+ if (res < 0) {
+ SCLogError(SC_ERR_PCRE_GET_SUBSTRING, "pcre_get_substring failed");
+ return NULL;
+ }
+
+ SCFree(ptr);
+ ptr = (char *)str_ptr;
+
+ if (ptr == NULL) {
+ data = SCMalloc(sizeof(DetectMarkData));
+ if (unlikely(data == NULL)) {
+ return NULL;
+ }
+ data->mark = mark;
+ data->mask = 0xffff;
+ return data;
+ }
+
+ errno = 0;
+ mask = strtoul(ptr, &endptr, 0);
+ if (errno == ERANGE) {
+ SCLogError(SC_ERR_NUMERIC_VALUE_ERANGE, "Numeric value out of range");
+ SCFree(ptr);
+ return NULL;
+ } /* If there is no numeric value in the given string then strtoull(), makes
+ endptr equals to ptr and return 0 as result */
+ else if (endptr == ptr && mask == 0) {
+ SCLogError(SC_ERR_INVALID_NUMERIC_VALUE, "No numeric value");
+ SCFree(ptr);
+ return NULL;
+ }
+ else if (endptr == ptr) {
+ SCLogError(SC_ERR_INVALID_NUMERIC_VALUE, "Invalid numeric value");
+ SCFree(ptr);
+ return NULL;
+ }
+
+ SCLogDebug("Rule will set mark 0x%x with mask 0x%x", mark, mask);
+ SCFree(ptr);
+
+ data = SCMalloc(sizeof(DetectMarkData));
+ if (unlikely(data == NULL)) {
+ return NULL;
+ }
+ data->mark = mark;
+ data->mask = mask;
+ return data;
+}
+
+#endif /* NFQ */
+
+/**
+ * \internal
+ * \brief this function is used to add the parsed mark 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 mark options
+ *
+ * \retval 0 on Success
+ * \retval -1 on Failure
+ */
+static int DetectMarkSetup (DetectEngineCtx *de_ctx, Signature *s, char *rawstr)
+{
+#ifdef NFQ
+ DetectMarkData *data = NULL;
+ SigMatch *sm = NULL;
+
+ data = DetectMarkParse(rawstr);
+
+ if (data == NULL) {
+ return -1;
+ } else {
+ sm = SigMatchAlloc();
+ if (sm == NULL) {
+ DetectMarkDataFree(data);
+ return -1;
+ }
+
+ sm->type = DETECT_MARK;
+ sm->ctx = (SigMatchCtx *)data;
+
+ /* Append it to the list of tags */
+ SigMatchAppendSMToList(s, sm, DETECT_SM_LIST_TMATCH);
+ return 0;
+ }
+#else
+ return 0;
+#endif
+}
+
+void DetectMarkDataFree(void *ptr)
+{
+ DetectMarkData *data = (DetectMarkData *)ptr;
+ SCFree(data);
+}
+
+
+int DetectMarkPacket(ThreadVars *t, DetectEngineThreadCtx *det_ctx, Packet *p, Signature *s, const SigMatchCtx *ctx)
+{
+#ifdef NFQ
+ const DetectMarkData *nf_data = (const DetectMarkData *)ctx;
+ if (nf_data->mask) {
+ p->nfq_v.mark = (nf_data->mark & nf_data->mask)
+ | (p->nfq_v.mark & ~(nf_data->mask));
+ p->flags |= PKT_MARK_MODIFIED;
+ }
+#endif
+ return 1;
+}
+
+/*
+ * ONLY TESTS BELOW THIS COMMENT
+ */
+
+#if defined UNITTESTS && defined NFQ
+/**
+ * \test MarkTestParse01 is a test for a valid mark value
+ *
+ * \retval 1 on succces
+ * \retval 0 on failure
+ */
+static int MarkTestParse01 (void)
+{
+ DetectMarkData *data;
+
+ data = DetectMarkParse("1/1");
+
+ if (data == NULL) {
+ return 0;
+ }
+
+ DetectMarkDataFree(data);
+ return 1;
+}
+
+/**
+ * \test MarkTestParse02 is a test for an invalid mark value
+ *
+ * \retval 1 on succces
+ * \retval 0 on failure
+ */
+static int MarkTestParse02 (void)
+{
+ DetectMarkData *data;
+
+ data = DetectMarkParse("4");
+
+ if (data == NULL) {
+ return 0;
+ }
+
+ DetectMarkDataFree(data);
+ return 1;
+}
+
+/**
+ * \test MarkTestParse03 is a test for a valid mark value
+ *
+ * \retval 1 on succces
+ * \retval 0 on failure
+ */
+static int MarkTestParse03 (void)
+{
+ DetectMarkData *data;
+
+ data = DetectMarkParse("0x10/0xff");
+
+ if (data == NULL) {
+ return 0;
+ }
+
+ DetectMarkDataFree(data);
+ return 1;
+}
+
+/**
+ * \test MarkTestParse04 is a test for a invalid mark value
+ *
+ * \retval 1 on succces
+ * \retval 0 on failure
+ */
+static int MarkTestParse04 (void)
+{
+ DetectMarkData *data;
+
+ data = DetectMarkParse("0x1g/0xff");
+
+ if (data == NULL) {
+ return 0;
+ }
+
+ DetectMarkDataFree(data);
+ return 1;
+}
+
+
+
+#endif /* UNITTESTS */
+
+/**
+ * \brief this function registers unit tests for Mark
+ */
+void MarkRegisterTests(void)
+{
+#if defined UNITTESTS && defined NFQ
+ UtRegisterTest("MarkTestParse01", MarkTestParse01, 1);
+ UtRegisterTest("MarkTestParse02", MarkTestParse02, 0);
+ UtRegisterTest("MarkTestParse03", MarkTestParse03, 1);
+ UtRegisterTest("MarkTestParse04", MarkTestParse04, 0);
+#endif /* UNITTESTS */
+}