/* client-tls13.c
 *
 * Copyright (C) 2006-2020 wolfSSL Inc.
 *
 * This file is part of wolfSSL. (formerly known as CyaSSL)
 *
 * wolfSSL is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * wolfSSL 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
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */

/* the usual suspects */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

/* socket includes */
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <unistd.h>

/* wolfSSL */
#include <wolfssl/options.h>
#include <wolfssl/ssl.h>
#include <wolfssl/wolfio.h>
#include <wolfssl/wolfcrypt/error-crypt.h>

#define DEFAULT_PORT 11111

#define CERT_FILE "../certs/client-cert.pem"
#define KEY_FILE  "../certs/client-key.pem"
#define CA_FILE   "../certs/ca-cert.pem"

#if defined(WOLFSSL_TLS13) && defined(HAVE_SECRET_CALLBACK)

#ifndef WOLFSSL_SSLKEYLOGFILE_OUTPUT
    #define WOLFSSL_SSLKEYLOGFILE_OUTPUT "sslkeylog.log"
#endif

/* Callback function for TLS v1.3 secrets for use with Wireshark */
static int Tls13SecretCallback(WOLFSSL* ssl, int id, const unsigned char* secret,
    int secretSz, void* ctx)
{
    int i;
    const char* str = NULL;
    unsigned char clientRandom[32];
    int clientRandomSz;
    XFILE fp = stderr;
    if (ctx) {
        fp = XFOPEN((const char*)ctx, "ab");
        if (fp == XBADFILE) {
            return BAD_FUNC_ARG;
        }
    }

    clientRandomSz = (int)wolfSSL_get_client_random(ssl, clientRandom,
        sizeof(clientRandom));

    if (clientRandomSz <= 0) {
        printf("Error getting client random %d\n", clientRandomSz);
    }

#if 0
    printf("TLS Client Secret CB: Rand %d, Secret %d\n",
        clientRandomSz, secretSz);
#endif

    switch (id) {
        case CLIENT_EARLY_TRAFFIC_SECRET:
            str = "CLIENT_EARLY_TRAFFIC_SECRET"; break;
        case EARLY_EXPORTER_SECRET:
            str = "EARLY_EXPORTER_SECRET"; break;
        case CLIENT_HANDSHAKE_TRAFFIC_SECRET:
            str = "CLIENT_HANDSHAKE_TRAFFIC_SECRET"; break;
        case SERVER_HANDSHAKE_TRAFFIC_SECRET:
            str = "SERVER_HANDSHAKE_TRAFFIC_SECRET"; break;
        case CLIENT_TRAFFIC_SECRET:
            str = "CLIENT_TRAFFIC_SECRET_0"; break;
        case SERVER_TRAFFIC_SECRET:
            str = "SERVER_TRAFFIC_SECRET_0"; break;
        case EXPORTER_SECRET:
            str = "EXPORTER_SECRET"; break;
    }

    fprintf(fp, "%s ", str);
    for (i = 0; i < clientRandomSz; i++) {
        fprintf(fp, "%02x", clientRandom[i]);
    }
    fprintf(fp, " ");
    for (i = 0; i < secretSz; i++) {
        fprintf(fp, "%02x", secret[i]);
    }
    fprintf(fp, "\n");

    if (fp != stderr) {
        XFCLOSE(fp);
    }

    return 0;
}
#endif /* WOLFSSL_TLS13 && HAVE_SECRET_CALLBACK */

int main(int argc, char** argv)
{
    int ret = 0;
#ifdef WOLFSSL_TLS13
    int                sockfd = SOCKET_INVALID;
    struct sockaddr_in servAddr;
    char               buff[256];
    size_t             len;

    /* declare wolfSSL objects */
    WOLFSSL_CTX* ctx = NULL;
    WOLFSSL*     ssl = NULL;

    /* Check for proper calling convention */
    if (argc != 2) {
        printf("usage: %s <IPv4 address>\n", argv[0]);
        return 0;
    }

    /* Create a socket that uses an internet IPv4 address,
     * Sets the socket to be stream based (TCP),
     * 0 means choose the default protocol. */
    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
        fprintf(stderr, "ERROR: failed to create the socket\n");
        ret = -1; goto exit;
    }

    /* Initialize the server address struct with zeros */
    memset(&servAddr, 0, sizeof(servAddr));

    /* Fill in the server address */
    servAddr.sin_family = AF_INET;             /* using IPv4      */
    servAddr.sin_port   = htons(DEFAULT_PORT); /* on DEFAULT_PORT */

    /* Get the server IPv4 address from the command line call */
    if (inet_pton(AF_INET, argv[1], &servAddr.sin_addr) != 1) {
        fprintf(stderr, "ERROR: invalid address\n");
        ret = -1; goto exit;
    }

    /* Connect to the server */
    if ((ret = connect(sockfd, (struct sockaddr*) &servAddr, sizeof(servAddr)))
         == -1) {
        fprintf(stderr, "ERROR: failed to connect\n");
        goto exit;
    }

    /*---------------------------------*/
    /* Start of wolfSSL initialization and configuration */
    /*---------------------------------*/
#if 0
    wolfSSL_Debugging_ON();
#endif

    /* Initialize wolfSSL */
    if ((ret = wolfSSL_Init()) != WOLFSSL_SUCCESS) {
        fprintf(stderr, "ERROR: Failed to initialize the library\n");
        goto exit;
    }

    /* Create and initialize WOLFSSL_CTX */
    if ((ctx = wolfSSL_CTX_new(wolfTLSv1_3_client_method())) == NULL) {
        fprintf(stderr, "ERROR: failed to create WOLFSSL_CTX\n");
        ret = -1; goto exit;
    }

    /* Load client certificate into WOLFSSL_CTX */
    if ((ret = wolfSSL_CTX_use_certificate_file(ctx, CERT_FILE, WOLFSSL_FILETYPE_PEM))
        != WOLFSSL_SUCCESS) {
        fprintf(stderr, "ERROR: failed to load %s, please check the file.\n",
                CERT_FILE);
        goto exit;
    }

    /* Load client key into WOLFSSL_CTX */
    if ((ret = wolfSSL_CTX_use_PrivateKey_file(ctx, KEY_FILE, WOLFSSL_FILETYPE_PEM))
        != WOLFSSL_SUCCESS) {
        fprintf(stderr, "ERROR: failed to load %s, please check the file.\n",
                KEY_FILE);
        goto exit;
    }

    /* Load CA certificate into WOLFSSL_CTX */
    if ((ret = wolfSSL_CTX_load_verify_locations(ctx, CA_FILE, NULL))
         != WOLFSSL_SUCCESS) {
        fprintf(stderr, "ERROR: failed to load %s, please check the file.\n",
                CA_FILE);
        goto exit;
    }

    /* Create a WOLFSSL object */
    if ((ssl = wolfSSL_new(ctx)) == NULL) {
        fprintf(stderr, "ERROR: failed to create WOLFSSL object\n");
        ret = -1; goto exit;
    }

    /* Attach wolfSSL to the socket */
    if ((ret = wolfSSL_set_fd(ssl, sockfd)) != WOLFSSL_SUCCESS) {
        fprintf(stderr, "ERROR: Failed to set the file descriptor\n");
        goto exit;
    }

#ifdef HAVE_SECRET_CALLBACK
    /* required for getting random used */
    wolfSSL_KeepArrays(ssl);

    /* optional logging for wireshark */
    wolfSSL_set_tls13_secret_cb(ssl, Tls13SecretCallback,
        (void*)WOLFSSL_SSLKEYLOGFILE_OUTPUT);
#endif

    /* Connect to wolfSSL on the server side */
    if ((ret = wolfSSL_connect(ssl)) != WOLFSSL_SUCCESS) {
        fprintf(stderr, "ERROR: failed to connect to wolfSSL\n");
        goto exit;
    }

#ifdef HAVE_SECRET_CALLBACK
    wolfSSL_FreeArrays(ssl);
#endif

    /* Get a message for the server from stdin */
    printf("Message for server: ");
    memset(buff, 0, sizeof(buff));
    if (fgets(buff, sizeof(buff), stdin) == NULL) {
        fprintf(stderr, "ERROR: failed to get message for server\n");
        ret = -1; goto exit;
    }
    len = strnlen(buff, sizeof(buff));

    /* Send the message to the server */
    if ((ret = wolfSSL_write(ssl, buff, len)) != len) {
        fprintf(stderr, "ERROR: failed to write entire message\n");
        fprintf(stderr, "%d bytes of %d bytes were sent", ret, (int) len);
        goto exit;
    }

    /* Read the server data into our buff array */
    memset(buff, 0, sizeof(buff));
    if ((ret = wolfSSL_read(ssl, buff, sizeof(buff)-1)) < 0) {
        fprintf(stderr, "ERROR: failed to read\n");
        goto exit;
    }

    /* Print to stdout any data the server sends */
    printf("Server: %s\n", buff);

    /* Return reporting a success */
    ret = 0;

exit:
    /* Cleanup and return */
    if (sockfd != SOCKET_INVALID)
        close(sockfd);          /* Close the connection to the server       */
    if (ssl)
        wolfSSL_free(ssl);      /* Free the wolfSSL object                  */
    if (ctx)
        wolfSSL_CTX_free(ctx);  /* Free the wolfSSL context object          */
    wolfSSL_Cleanup();          /* Cleanup the wolfSSL environment          */
#else
    printf("Example requires TLS v1.3\n");
#endif
    (void)argc;
    (void)argv;

    return ret;
}
