#include <config.h>

#include "fuzzer.h"

#include "openvswitch/ofp-flow.h"

#include "ofp-version-opt.h"

#include "ofproto/ofproto.h"

#include "openflow/openflow.h"

#include "openvswitch/ofpbuf.h"

#include "openvswitch/vlog.h"

#include "util.h"

static void

ofctl_parse_flows__(struct ofputil_flow_mod *fms, size_t n_fms,

                    enum ofputil_protocol usable_protocols)

{

    enum ofputil_protocol protocol = 0;

    char *usable_s;

    size_t i;

    usable_s = ofputil_protocols_to_string(usable_protocols);

    printf("usable protocols: %s\n", usable_s);

    free(usable_s);

    if (!(usable_protocols & OFPUTIL_P_ANY)) {

        printf("no usable protocol\n");

        goto free;

    }

    for (i = 0; i < sizeof(enum ofputil_protocol) * CHAR_BIT; i++) {

        protocol = 1u << i;

        if (protocol & usable_protocols & OFPUTIL_P_ANY) {

            break;

        }

    }

    ovs_assert(is_pow2(protocol));

    printf("chosen protocol: %s\n", ofputil_protocol_to_string(protocol));

    for (i = 0; i < n_fms; i++) {

        struct ofputil_flow_mod *fm = &fms[i];

        struct ofpbuf *msg;

        msg = ofputil_encode_flow_mod(fm, protocol);

        ofpbuf_delete(msg);

    }

free:

    for (i = 0; i < n_fms; i++) {

        struct ofputil_flow_mod *fm = &fms[i];

        free(CONST_CAST(struct ofpact *, fm->ofpacts));

        minimatch_destroy(&fm->match);

    }

}

/* "parse-flow FLOW": parses the argument as a flow (like add-flow) and prints

 * it back to stdout.  */

static void

ofctl_parse_flow(const char *input, int command)

{

    enum ofputil_protocol usable_protocols;

    struct ofputil_flow_mod fm;

    char *error;

    error = parse_ofp_flow_mod_str(&fm, input, NULL, NULL,

                                   command, &usable_protocols);

    if (error) {

        printf("Error encountered: %s\n", error);

        free(error);

    } else {

        ofctl_parse_flows__(&fm, 1, usable_protocols);

    }

}

int

LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)

{

    /* Bail out if we cannot construct at least a 1 char string.

     * Reserve 1 byte to decide flow mod command.

     *

     * Here's the structure of data we expect

     * |--Byte 1--|--Byte 2--|...|--Byte (size-1)--|

     *

     * where,

     *

     * Byte 1: Used to decide which ofp flow mod command to test

     * Bytes 2--(size-1): The C string that is actually passed to

     *                    ofctl_parse_flow() test API.

     *

     * This means that the fuzzed input is actually a C string of

     * length = (size -2) with the terminal byte being the NUL

     * character. Moreover, this string is expected to not contain

     * a new-line character.

     */

    const char *stream = (const char *) data;

    if (size < 3 || stream[size - 1] != '\0' || strchr(&stream[1], '\n') ||

        strlen(&stream[1]) != size - 2) {

        return 0;

    }

    /* Disable logging to avoid write to disk. */

    static bool isInit = false;

    if (!isInit) {

        vlog_set_verbosity("off");

        isInit = true;

    }

    /* Decide test parameters using first byte of fuzzed input. */

    int command = (stream[0] % OFPFC_DELETE_STRICT) + 1;

    /* Fuzz extended match parsing. */

    const char *input = &stream[1];

    ofctl_parse_flow(input, command);

    return 0;

}