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85 lines
2.8 KiB
C
85 lines
2.8 KiB
C
/* Copyright (C) 2024 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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#include "suricata-common.h"
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#include "detect-parse.h"
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#include "detect-engine.h"
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#include "detect-dns-rrtype.h"
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#include "rust.h"
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#include "detect-engine-uint.h"
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static int dns_rrtype_list_id = 0;
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static void DetectDnsRrtypeFree(DetectEngineCtx *, void *ptr);
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static int DetectDnsRrtypeSetup(DetectEngineCtx *de_ctx, Signature *s, const char *str)
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{
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SCEnter();
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if (DetectSignatureSetAppProto(s, ALPROTO_DNS) != 0) {
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SCReturnInt(-1);
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}
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void *detect = DetectU16Parse(str);
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if (detect == NULL) {
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SCLogError("failed to parse dns.rrtype: %s", str);
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SCReturnInt(-1);
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}
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if (SigMatchAppendSMToList(
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de_ctx, s, DETECT_DNS_RRTYPE, (SigMatchCtx *)detect, dns_rrtype_list_id) == NULL) {
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DetectDnsRrtypeFree(de_ctx, detect);
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SCReturnInt(-1);
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}
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SCReturnInt(0);
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}
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static void DetectDnsRrtypeFree(DetectEngineCtx *de_ctx, void *ptr)
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{
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SCEnter();
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if (ptr != NULL) {
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rs_detect_u16_free(ptr);
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}
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SCReturn;
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}
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static int DetectDnsRrtypeMatch(DetectEngineThreadCtx *det_ctx, Flow *f, uint8_t flags, void *state,
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void *txv, const Signature *s, const SigMatchCtx *ctx)
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{
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return SCDnsDetectRrtypeMatch(txv, (void *)ctx, flags);
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}
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void DetectDnsRrtypeRegister(void)
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{
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sigmatch_table[DETECT_DNS_RRTYPE].name = "dns.rrtype";
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sigmatch_table[DETECT_DNS_RRTYPE].desc = "Match the DNS rrtype in message body.";
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sigmatch_table[DETECT_DNS_RRTYPE].url = "/rules/dns-keywords.html#dns-rrtype";
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sigmatch_table[DETECT_DNS_RRTYPE].Setup = DetectDnsRrtypeSetup;
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sigmatch_table[DETECT_DNS_RRTYPE].Free = DetectDnsRrtypeFree;
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sigmatch_table[DETECT_DNS_RRTYPE].Match = NULL;
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sigmatch_table[DETECT_DNS_RRTYPE].AppLayerTxMatch = DetectDnsRrtypeMatch;
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DetectAppLayerInspectEngineRegister(
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"dns.rrtype", ALPROTO_DNS, SIG_FLAG_TOSERVER, 0, DetectEngineInspectGenericList, NULL);
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DetectAppLayerInspectEngineRegister(
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"dns.rrtype", ALPROTO_DNS, SIG_FLAG_TOCLIENT, 0, DetectEngineInspectGenericList, NULL);
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dns_rrtype_list_id = DetectBufferTypeGetByName("dns.rrtype");
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} |