fuzz_applayerprotodetectgetproto.c

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/**
 * @file
 * @author Philippe Antoine <contact@catenacyber.fr>
 * fuzz target for AppLayerProtoDetectGetProto
 */
 
 
#include "suricata-common.h"
#include "suricata.h"
#include "app-layer-detect-proto.h"
#include "flow-util.h"
#include "app-layer.h"
#include "util-unittest-helper.h"
#include "conf-yaml-loader.h"
 
#define HEADER_LEN 6
 
//rule of thumb constant, so as not to timeout target
#define PROTO_DETECT_MAX_LEN 1024
 
extern const char *configNoChecksum;
 
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
 
AppLayerProtoDetectThreadCtx *alpd_tctx = NULL;
SC_ATOMIC_EXTERN(unsigned int, engine_stage);
 
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
    Flow *f;
    TcpSession ssn;
    bool reverse;
 
    if (alpd_tctx == NULL) {
        //global init
        InitGlobal();
        SCRunmodeSet(RUNMODE_UNITTEST);
        if (ConfYamlLoadString(configNoChecksum, strlen(configNoChecksum)) != 0) {
            abort();
        }
        MpmTableSetup();
        SpmTableSetup();
        EngineModeSetIDS();
        AppLayerSetup();
        alpd_tctx = AppLayerProtoDetectGetCtxThread();
        SC_ATOMIC_SET(engine_stage, SURICATA_RUNTIME);
    }
 
    if (size < HEADER_LEN) {
        return 0;
    }
 
    f = TestHelperBuildFlow(AF_INET, "1.2.3.4", "5.6.7.8", (uint16_t)((data[2] << 8) | data[3]),
            (uint16_t)((data[4] << 8) | data[5]));
    if (f == NULL) {
        return 0;
    }
    f->proto = data[1];
    memset(&ssn, 0, sizeof(TcpSession));
    f->protoctx = &ssn;
    f->protomap = FlowGetProtoMapping(f->proto);
 
    uint8_t flags = STREAM_TOCLIENT;
    if (data[0] & STREAM_TOSERVER) {
        flags = STREAM_TOSERVER;
    }
    AppLayerProtoDetectGetProto(
            alpd_tctx, f, data + HEADER_LEN, size - HEADER_LEN, f->proto, flags, &reverse);
    FlowFree(f);
 
    return 0;
}