/**

 * @file

 * @author Philippe Antoine <contact@catenacyber.fr>

 * fuzz target for predefined signatures and pcap (aware)

 */

#include "suricata-common.h"

#include "source-pcap-file.h"

#include "detect-engine.h"

#include "util-classification-config.h"

#include "util-reference-config.h"

#include "app-layer.h"

#include "tm-queuehandlers.h"

#include "util-cidr.h"

#include "util-profiling.h"

#include "util-proto-name.h"

#include "detect-engine-tag.h"

#include "detect-engine-threshold.h"

#include "host-bit.h"

#include "ippair-bit.h"

#include "app-layer-htp.h"

#include "detect-fast-pattern.h"

#include "util-unittest-helper.h"

#include "conf-yaml-loader.h"

#include "pkt-var.h"

#include "flow-util.h"

#include "tm-modules.h"

#include "tmqh-packetpool.h"

#include "util-conf.h"

#include "packet.h"

#include <fuzz_pcap.h>

int LLVMFuzzerInitialize(const int *argc, char ***argv);

int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);

static int initialized = 0;

ThreadVars tv;

DecodeThreadVars *dtv;

// FlowWorkerThreadData

void *fwd;

SCInstance surifuzz;

SC_ATOMIC_EXTERN(unsigned int, engine_stage);

extern const char *configNoChecksum;

char *filepath = NULL;

int LLVMFuzzerInitialize(const int *argc, char ***argv)

{

    filepath = dirname(strdup((*argv)[0]));

    return 0;

}

int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)

{

    FPC_buffer_t pkts;

    const u_char *pkt;

    struct pcap_pkthdr header;

    int r;

    Packet *p;

    size_t pcap_cnt = 0;

    if (initialized == 0) {

        // Redirects logs to /dev/null

        setenv("SC_LOG_OP_IFACE", "file", 0);

        setenv("SC_LOG_FILE", "/dev/null", 0);

        InitGlobal();

        GlobalsInitPreConfig();

        run_mode = RUNMODE_PCAP_FILE;

        // redirect logs to /tmp

        ConfigSetLogDirectory("/tmp/");

        // disables checksums validation for fuzzing

        if (ConfYamlLoadString(configNoChecksum, strlen(configNoChecksum)) != 0) {

            abort();

        }

        surifuzz.sig_file = malloc(strlen(filepath) + strlen("/fuzz.rules") + 1);

        memcpy(surifuzz.sig_file, filepath, strlen(filepath));

        memcpy(surifuzz.sig_file + strlen(filepath), "/fuzz.rules", strlen("/fuzz.rules"));

        surifuzz.sig_file[strlen(filepath) + strlen("/fuzz.rules")] = 0;

        surifuzz.sig_file_exclusive = 1;

        // loads rules after init

        surifuzz.delayed_detect = 1;

        PostConfLoadedSetup(&surifuzz);

        PreRunPostPrivsDropInit(run_mode);

        PostConfLoadedDetectSetup(&surifuzz);

        memset(&tv, 0, sizeof(tv));

        tv.flow_queue = FlowQueueNew();

        if (tv.flow_queue == NULL)

            abort();

        dtv = DecodeThreadVarsAlloc(&tv);

        DecodeRegisterPerfCounters(dtv, &tv);

        tmm_modules[TMM_FLOWWORKER].ThreadInit(&tv, NULL, &fwd);

        StatsSetupPrivate(&tv);

        extern uint16_t max_pending_packets;

        max_pending_packets = 128;

        PacketPoolInit();

        if (DetectEngineReload(&surifuzz) < 0) {

            return 0;

        }

        SC_ATOMIC_SET(engine_stage, SURICATA_RUNTIME);

        initialized = 1;

    }

    if (size < FPC0_HEADER_LEN) {

        return 0;

    }

    // initialize FPC with the buffer

    if (FPC_init(&pkts, data, size) < 0) {

        return 0;

    }

    // loop over packets

    r = FPC_next(&pkts, &header, &pkt);

    p = PacketGetFromAlloc();

    if (p == NULL || r <= 0 || header.ts.tv_sec >= INT_MAX - 3600) {

        goto bail;

    }

    p->ts = SCTIME_FROM_TIMEVAL(&header.ts);

    p->datalink = pkts.datalink;

    p->pkt_src = PKT_SRC_WIRE;

    while (r > 0) {

        if (PacketCopyData(p, pkt, header.caplen) == 0) {

            // DecodePcapFile

            TmEcode ecode = tmm_modules[TMM_DECODEPCAPFILE].Func(&tv, p, dtv);

            if (ecode == TM_ECODE_FAILED) {

                break;

            }

            Packet *extra_p = PacketDequeueNoLock(&tv.decode_pq);

            while (extra_p != NULL) {

                PacketFreeOrRelease(extra_p);

                extra_p = PacketDequeueNoLock(&tv.decode_pq);

            }

            tmm_modules[TMM_FLOWWORKER].Func(&tv, p, fwd);

            extra_p = PacketDequeueNoLock(&tv.decode_pq);

            while (extra_p != NULL) {

                PacketFreeOrRelease(extra_p);

                extra_p = PacketDequeueNoLock(&tv.decode_pq);

            }

        }

        r = FPC_next(&pkts, &header, &pkt);

        if (r <= 0 || header.ts.tv_sec >= INT_MAX - 3600) {

            goto bail;

        }

        PacketRecycle(p);

        p->ts = SCTIME_FROM_TIMEVAL(&header.ts);

        p->datalink = pkts.datalink;

        pcap_cnt++;

        p->pcap_cnt = pcap_cnt;

        p->pkt_src = PKT_SRC_WIRE;

    }

bail:

    if (p != NULL) {

        PacketFree(p);

    }

    FlowReset();

    return 0;

}