/*

 * Copyright 2016-2026 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 * https://www.openssl.org/source/license.html

 * or in the file LICENSE in the source distribution.

 */

#include <time.h>

#include <openssl/rand.h>

#include <openssl/ssl.h>

#include <openssl/rsa.h>

#include <openssl/dsa.h>

#include <openssl/ec.h>

#include <openssl/dh.h>

#include <openssl/err.h>

#include "fuzzer.h"

/* unused, to avoid warning. */

static int idx;

#define FUZZTIME 1485898104

#define TIME_IMPL(t)       \

    {                      \

        if (t != NULL)     \

            *t = FUZZTIME; \

        return FUZZTIME;   \

    }

/*

 * This might not work in all cases (and definitely not on Windows

 * because of the way linkers are) and callees can still get the

 * current time instead of the fixed time. This will just result

 * in things not being fully reproducible and have a slightly

 * different coverage.

 */

#if !defined(_WIN32)

time_t time(time_t *t) TIME_IMPL(t)

#endif

    int FuzzerInitialize(int *argc, char ***argv)

{

    STACK_OF(SSL_COMP) *comp_methods;

    FuzzerSetRand();

    OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS | OPENSSL_INIT_ASYNC, NULL);

    OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS, NULL);

    ERR_clear_error();

    CRYPTO_free_ex_index(0, -1);

    idx = SSL_get_ex_data_X509_STORE_CTX_idx();

    comp_methods = SSL_COMP_get_compression_methods();

    if (comp_methods != NULL)

        sk_SSL_COMP_sort(comp_methods);

    return 1;

}

int FuzzerTestOneInput(const uint8_t *buf, size_t len)

{

    SSL *client = NULL;

    BIO *in;

    BIO *out;

    SSL_CTX *ctx;

    if (len == 0 || len > INT_MAX)

        return 0;

    /* This only fuzzes the initial flow from the client so far. */

    ctx = SSL_CTX_new(DTLS_client_method());

    if (ctx == NULL)

        goto end;

    client = SSL_new(ctx);

    if (client == NULL)

        goto end;

    if (SSL_set_min_proto_version(client, 0) != 1)

        goto end;

    if (SSL_set_max_proto_version(client, 0) != 1)

        goto end;

    if (SSL_set_cipher_list(client, "ALL:eNULL:@SECLEVEL=0") != 1)

        goto end;

    SSL_set_tlsext_host_name(client, "localhost");

    in = BIO_new(BIO_s_mem());

    if (in == NULL)

        goto end;

    out = BIO_new(BIO_s_mem());

    if (out == NULL) {

        BIO_free(in);

        goto end;

    }

    SSL_set_bio(client, in, out);

    SSL_set_connect_state(client);

    if ((size_t)BIO_write(in, buf, (int)len) != len)

        goto end;

    if (SSL_do_handshake(client) == 1) {

        /* Keep reading application data until error or EOF. */

        uint8_t tmp[1024];

        for (;;) {

            if (SSL_read(client, tmp, sizeof(tmp)) <= 0) {

                break;

            }

        }

    }

end:

    SSL_free(client);

    ERR_clear_error();

    SSL_CTX_free(ctx);

    return 0;

}

void FuzzerCleanup(void)

{

    FuzzerClearRand();

}