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/* Copyright (C) 2019 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.
*/
#include "suricata-common.h"
#include "detect-parse.h"
#include "detect-engine.h"
#include "detect-dns-opcode.h"
#include "rust.h"
static int dns_opcode_list_id = 0;
static void DetectDnsOpcodeFree(DetectEngineCtx *, void *ptr);
static int DetectDnsOpcodeSetup(DetectEngineCtx *de_ctx, Signature *s,
const char *str)
{
SCEnter();
if (DetectSignatureSetAppProto(s, ALPROTO_DNS) != 0) {
return -1;
}
void *detect = rs_detect_dns_opcode_parse(str);
if (detect == NULL) {
SCLogError("failed to parse dns.opcode: %s", str);
return -1;
}
SigMatch *sm = SigMatchAlloc();
if (unlikely(sm == NULL)) {
goto error;
}
sm->type = DETECT_AL_DNS_OPCODE;
sm->ctx = (void *)detect;
SigMatchAppendSMToList(s, sm, dns_opcode_list_id);
SCReturnInt(0);
error:
DetectDnsOpcodeFree(de_ctx, detect);
SCReturnInt(-1);
}
static void DetectDnsOpcodeFree(DetectEngineCtx *de_ctx, void *ptr)
{
SCEnter();
if (ptr != NULL) {
rs_dns_detect_opcode_free(ptr);
}
SCReturn;
}
static int DetectDnsOpcodeMatch(DetectEngineThreadCtx *det_ctx,
Flow *f, uint8_t flags, void *state, void *txv, const Signature *s,
const SigMatchCtx *ctx)
{
return rs_dns_opcode_match(txv, (void *)ctx, flags);
}
void DetectDnsOpcodeRegister(void)
{
sigmatch_table[DETECT_AL_DNS_OPCODE].name = "dns.opcode";
sigmatch_table[DETECT_AL_DNS_OPCODE].desc = "Match the DNS header opcode flag.";
sigmatch_table[DETECT_AL_DNS_OPCODE].Setup = DetectDnsOpcodeSetup;
sigmatch_table[DETECT_AL_DNS_OPCODE].Free = DetectDnsOpcodeFree;
sigmatch_table[DETECT_AL_DNS_OPCODE].Match = NULL;
sigmatch_table[DETECT_AL_DNS_OPCODE].AppLayerTxMatch =
DetectDnsOpcodeMatch;
DetectAppLayerInspectEngineRegister2(
"dns.opcode", ALPROTO_DNS, SIG_FLAG_TOSERVER, 0, DetectEngineInspectGenericList, NULL);
DetectAppLayerInspectEngineRegister2(
"dns.opcode", ALPROTO_DNS, SIG_FLAG_TOCLIENT, 0, DetectEngineInspectGenericList, NULL);
dns_opcode_list_id = DetectBufferTypeGetByName("dns.opcode");
}
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