int main (int argc, char** argv) 
{
    int     		sockfd = 0;
    struct  		sockaddr_in servAddr;
    const char* 	host = argv[1];
    CYASSL* 		ssl = 0;
    CYASSL_CTX* 	ctx = 0;
    CYASSL* 		sslResume = 0;
    CYASSL_SESSION*	session = 0;
    int     		resumeSession = 0;
    char            cert_array[] = "../cyassl/certs/ca-cert.pem";
    char*           certs = cert_array;
    char*           srTest = "testing session resume";
    
    if (argc != 2) {
	    printf("usage: udpcli <IP address>\n");
        return 1;
    }

    CyaSSL_Init();

    /* CyaSSL_Debugging_ON();*/

    if ( (ctx = CyaSSL_CTX_new(CyaDTLSv1_2_client_method())) == NULL) {
	    fprintf(stderr, "CyaSSL_CTX_new error.\n");
	    return(EXIT_FAILURE);
    }

    if (CyaSSL_CTX_load_verify_locations(ctx,certs, 0) != SSL_SUCCESS) {
	    fprintf(stderr, "Error loading %s, please check the file.\n", certs);
	    return(EXIT_FAILURE);
    }

    ssl = CyaSSL_new(ctx);
    if (ssl == NULL) {
	    printf("unable to get ssl object");
        return 1;
    }

    memset(&servAddr, 0, sizeof(servAddr));
    servAddr.sin_family = AF_INET;
    servAddr.sin_port = htons(SERV_PORT);
    if (inet_pton(AF_INET, host, &servAddr.sin_addr) < 1) {
        printf("Error and/or invalid IP address");
        return 1;
    }

    CyaSSL_dtls_set_peer(ssl, &servAddr, sizeof(servAddr));

    if ( (sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 
    	printf("cannot create a socket."); 
        return 1;
    }

    CyaSSL_set_fd(ssl, sockfd);
    CyaSSL_set_using_nonblock(ssl, 1);
    fcntl(sockfd, F_SETFL, O_NONBLOCK);
    NonBlockingDTLS_Connect(ssl);

    DatagramClient(ssl);
    while ( (CyaSSL_write(ssl, srTest, sizeof(srTest))) != sizeof(srTest)) { 
	    printf("failed to write");
        return 1;
    }

    session = CyaSSL_get_session(ssl);
    sslResume = CyaSSL_new(ctx);

    CyaSSL_shutdown(ssl);
    CyaSSL_free(ssl);
    close(sockfd);

    memset(&servAddr, 0, sizeof(servAddr));
    servAddr.sin_family = AF_INET;
    servAddr.sin_port = htons(SERV_PORT);
    if (inet_pton(AF_INET, host, &servAddr.sin_addr) < 1) {
        printf("Error and/or invalid IP address");
        return 1;
    }

    CyaSSL_dtls_set_peer(sslResume, &servAddr, sizeof(servAddr));

    if ( (sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 
	   printf("cannot create a socket.");
    return 1; 
    }

    CyaSSL_set_fd(sslResume, sockfd);
    CyaSSL_set_session(sslResume, session);
    CyaSSL_set_using_nonblock(sslResume, 1);
    fcntl(sockfd, F_SETFL, O_NONBLOCK);
    NonBlockingDTLS_Connect(sslResume);

    if(CyaSSL_session_reused(sslResume))
	    printf("reused session id\n");
    else
	    printf("didn't reuse session id!!!\n");

    DatagramClient(sslResume);
    while ((CyaSSL_write(sslResume, srTest, sizeof(srTest))) != sizeof(srTest))
    { 
	    printf("failed to write");
        return 1;
    }
    sleep(1);

    CyaSSL_shutdown(sslResume);
    CyaSSL_free(sslResume);
   
    close(sockfd);
    CyaSSL_CTX_free(ctx);
    CyaSSL_Cleanup();

    return 0;
}
示例#2
0
文件: client.c 项目: BrianAker/cyassl
THREAD_RETURN CYASSL_THREAD client_test(void* args)
{
    SOCKET_T sockfd = 0;

    CYASSL_METHOD*  method  = 0;
    CYASSL_CTX*     ctx     = 0;
    CYASSL*         ssl     = 0;
    
    CYASSL*         sslResume = 0;
    CYASSL_SESSION* session = 0;
    char         resumeMsg[] = "resuming cyassl!";
    int          resumeSz    = sizeof(resumeMsg);

    char msg[32] = "hello cyassl!";   /* GET may make bigger */
    char reply[80];
    int  input;
    int  msgSz = (int)strlen(msg);

    int   port   = yasslPort;
    char* host   = (char*)yasslIP;
    char* domain = (char*)"www.yassl.com";

    int    ch;
    int    version = CLIENT_INVALID_VERSION;
    int    usePsk   = 0;
    int    sendGET  = 0;
    int    benchmark = 0;
    int    doDTLS    = 0;
    int    matchName = 0;
    int    doPeerCheck = 1;
    int    nonBlocking = 0;
    int    resumeSession = 0;
    int    trackMemory   = 0;
    int    useClientCert = 1;
    int    fewerPackets  = 0;
    int    atomicUser    = 0;
    int    pkCallbacks   = 0;
    char*  cipherList = NULL;
    char*  verifyCert = (char*)caCert;
    char*  ourCert    = (char*)cliCert;
    char*  ourKey     = (char*)cliKey;

#ifdef HAVE_SNI
    char*  sniHostName = NULL;
#endif
#ifdef HAVE_MAX_FRAGMENT
    byte maxFragment = 0;
#endif
#ifdef HAVE_TRUNCATED_HMAC
    byte  truncatedHMAC = 0;
#endif


#ifdef HAVE_OCSP
    int    useOcsp  = 0;
    char*  ocspUrl  = NULL;
#endif

    int     argc = ((func_args*)args)->argc;
    char**  argv = ((func_args*)args)->argv;

    ((func_args*)args)->return_code = -1; /* error state */

#ifdef NO_RSA
    verifyCert = (char*)eccCert;
    ourCert    = (char*)cliEccCert;
    ourKey     = (char*)cliEccKey;
#endif
    (void)resumeSz;
    (void)session;
    (void)sslResume;
    (void)trackMemory;
    (void)atomicUser;
    (void)pkCallbacks;

    StackTrap();

    while ((ch = mygetopt(argc, argv,
                          "?gdusmNrtfxUPh:p:v:l:A:c:k:b:zS:L:ToO:")) != -1) {
        switch (ch) {
            case '?' :
                Usage();
                exit(EXIT_SUCCESS);

            case 'g' :
                sendGET = 1;
                break;

            case 'd' :
                doPeerCheck = 0;
                break;

            case 'u' :
                doDTLS  = 1;
                break;

            case 's' :
                usePsk = 1;
                break;

            case 't' :
            #ifdef USE_CYASSL_MEMORY
                trackMemory = 1;
            #endif
                break;

            case 'm' :
                matchName = 1;
                break;

            case 'x' :
                useClientCert = 0;
                break;

            case 'f' :
                fewerPackets = 1;
                break;

            case 'U' :
            #ifdef ATOMIC_USER
                atomicUser = 1;
            #endif
                break;

            case 'P' :
            #ifdef HAVE_PK_CALLBACKS 
                pkCallbacks = 1;
            #endif
                break;

            case 'h' :
                host   = myoptarg;
                domain = myoptarg;
                break;

            case 'p' :
                port = atoi(myoptarg);
                #if !defined(NO_MAIN_DRIVER) || defined(USE_WINDOWS_API)
                    if (port == 0)
                        err_sys("port number cannot be 0");
                #endif
                break;

            case 'v' :
                version = atoi(myoptarg);
                if (version < 0 || version > 3) {
                    Usage();
                    exit(MY_EX_USAGE);
                }
                break;

            case 'l' :
                cipherList = myoptarg;
                break;

            case 'A' :
                verifyCert = myoptarg;
                break;

            case 'c' :
                ourCert = myoptarg;
                break;

            case 'k' :
                ourKey = myoptarg;
                break;

            case 'b' :
                benchmark = atoi(myoptarg);
                if (benchmark < 0 || benchmark > 1000000) {
                    Usage();
                    exit(MY_EX_USAGE);
                }
                break;

            case 'N' :
                nonBlocking = 1;
                break;

            case 'r' :
                resumeSession = 1;
                break;

            case 'z' :
                #ifndef CYASSL_LEANPSK
                    CyaSSL_GetObjectSize();
                #endif
                break;

            case 'S' :
                #ifdef HAVE_SNI
                    sniHostName = myoptarg;
                #endif
                break;

            case 'L' :
                #ifdef HAVE_MAX_FRAGMENT
                    maxFragment = atoi(myoptarg);
                    if (maxFragment < CYASSL_MFL_2_9 ||
                                                maxFragment > CYASSL_MFL_2_13) {
                        Usage();
                        exit(MY_EX_USAGE);
                    }
                #endif
                break;

            case 'T' :
                #ifdef HAVE_TRUNCATED_HMAC
                    truncatedHMAC = 1;
                #endif
                break;

            case 'o' :
                #ifdef HAVE_OCSP
                    useOcsp = 1;
                #endif
                break;

            case 'O' :
                #ifdef HAVE_OCSP
                    useOcsp = 1;
                    ocspUrl = myoptarg;
                #endif
                break;

            default:
                Usage();
                exit(MY_EX_USAGE);
        }
    }

    myoptind = 0;      /* reset for test cases */

    /* sort out DTLS versus TLS versions */
    if (version == CLIENT_INVALID_VERSION) {
        if (doDTLS)
            version = CLIENT_DTLS_DEFAULT_VERSION;
        else
            version = CLIENT_DEFAULT_VERSION;
    }
    else {
        if (doDTLS) {
            if (version == 3)
                version = -2;
            else
                version = -1;
        }
    }

#ifdef USE_CYASSL_MEMORY
    if (trackMemory)
        InitMemoryTracker(); 
#endif

    switch (version) {
#ifndef NO_OLD_TLS
        case 0:
            method = CyaSSLv3_client_method();
            break;
                
                
    #ifndef NO_TLS
        case 1:
            method = CyaTLSv1_client_method();
            break;

        case 2:
            method = CyaTLSv1_1_client_method();
            break;
    #endif /* NO_TLS */
                
#endif  /* NO_OLD_TLS */
                
#ifndef NO_TLS
        case 3:
            method = CyaTLSv1_2_client_method();
            break;
#endif

#ifdef CYASSL_DTLS
        case -1:
            method = CyaDTLSv1_client_method();
            break;

        case -2:
            method = CyaDTLSv1_2_client_method();
            break;
#endif

        default:
            err_sys("Bad SSL version");
            break;
    }

    if (method == NULL)
        err_sys("unable to get method");

    ctx = CyaSSL_CTX_new(method);
    if (ctx == NULL)
        err_sys("unable to get ctx");

    if (cipherList)
        if (CyaSSL_CTX_set_cipher_list(ctx, cipherList) != SSL_SUCCESS)
            err_sys("client can't set cipher list 1");

#ifdef CYASSL_LEANPSK
    usePsk = 1;
#endif

#if defined(NO_RSA) && !defined(HAVE_ECC)
    usePsk = 1;
#endif

    if (fewerPackets)
        CyaSSL_CTX_set_group_messages(ctx);

    if (usePsk) {
#ifndef NO_PSK
        CyaSSL_CTX_set_psk_client_callback(ctx, my_psk_client_cb);
        if (cipherList == NULL) {
            const char *defaultCipherList;
            #ifdef HAVE_NULL_CIPHER
                defaultCipherList = "PSK-NULL-SHA256";
            #else
                defaultCipherList = "PSK-AES128-CBC-SHA256";
            #endif
            if (CyaSSL_CTX_set_cipher_list(ctx,defaultCipherList) !=SSL_SUCCESS)
                err_sys("client can't set cipher list 2");
        }
#endif
        useClientCert = 0;
    }

#ifdef OPENSSL_EXTRA
    CyaSSL_CTX_set_default_passwd_cb(ctx, PasswordCallBack);
#endif

#if defined(CYASSL_SNIFFER) && !defined(HAVE_NTRU) && !defined(HAVE_ECC)
    if (cipherList == NULL) {
        /* don't use EDH, can't sniff tmp keys */
        if (CyaSSL_CTX_set_cipher_list(ctx, "AES256-SHA256") != SSL_SUCCESS) {
            err_sys("client can't set cipher list 3");
        }
    }
#endif

#ifdef HAVE_OCSP
    if (useOcsp) {
        if (ocspUrl != NULL) {
            CyaSSL_CTX_SetOCSP_OverrideURL(ctx, ocspUrl);
            CyaSSL_CTX_EnableOCSP(ctx, CYASSL_OCSP_NO_NONCE
                                                    | CYASSL_OCSP_URL_OVERRIDE);
        }
        else
            CyaSSL_CTX_EnableOCSP(ctx, CYASSL_OCSP_NO_NONCE);
    }
#endif

#ifdef USER_CA_CB
    CyaSSL_CTX_SetCACb(ctx, CaCb);
#endif

#ifdef VERIFY_CALLBACK
    CyaSSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, myVerify);
#endif
#if !defined(NO_FILESYSTEM) && !defined(NO_CERTS)
    if (useClientCert){
        if (CyaSSL_CTX_use_certificate_chain_file(ctx, ourCert) != SSL_SUCCESS)
            err_sys("can't load client cert file, check file and run from"
                    " CyaSSL home dir");

        if (CyaSSL_CTX_use_PrivateKey_file(ctx, ourKey, SSL_FILETYPE_PEM)
                                         != SSL_SUCCESS)
            err_sys("can't load client private key file, check file and run "
                    "from CyaSSL home dir");
    }

    if (!usePsk) {
        if (CyaSSL_CTX_load_verify_locations(ctx, verifyCert, 0) != SSL_SUCCESS)
                err_sys("can't load ca file, Please run from CyaSSL home dir");
    }
#endif
#if !defined(NO_CERTS)
    if (!usePsk && doPeerCheck == 0)
        CyaSSL_CTX_set_verify(ctx, SSL_VERIFY_NONE, 0);
#endif

#ifdef HAVE_CAVIUM
    CyaSSL_CTX_UseCavium(ctx, CAVIUM_DEV_ID);
#endif

#ifdef HAVE_SNI
    if (sniHostName)
        if (CyaSSL_CTX_UseSNI(ctx, 0, sniHostName, XSTRLEN(sniHostName))
                                                                 != SSL_SUCCESS)
            err_sys("UseSNI failed");
#endif
#ifdef HAVE_MAX_FRAGMENT
    if (maxFragment)
        if (CyaSSL_CTX_UseMaxFragment(ctx, maxFragment) != SSL_SUCCESS)
            err_sys("UseMaxFragment failed");
#endif
#ifdef HAVE_TRUNCATED_HMAC
    if (truncatedHMAC)
        if (CyaSSL_CTX_UseTruncatedHMAC(ctx) != SSL_SUCCESS)
            err_sys("UseTruncatedHMAC failed");
#endif

    if (benchmark) {
        /* time passed in number of connects give average */
        int times = benchmark;
        int i = 0;

        double start = current_time(), avg;

        for (i = 0; i < times; i++) {
            tcp_connect(&sockfd, host, port, doDTLS);

            ssl = CyaSSL_new(ctx);
            CyaSSL_set_fd(ssl, sockfd);
            if (CyaSSL_connect(ssl) != SSL_SUCCESS)
                err_sys("SSL_connect failed");

            CyaSSL_shutdown(ssl);
            CyaSSL_free(ssl);
            CloseSocket(sockfd);
        }
        avg = current_time() - start;
        avg /= times;
        avg *= 1000;   /* milliseconds */
        printf("CyaSSL_connect avg took: %8.3f milliseconds\n", avg);

        CyaSSL_CTX_free(ctx);
        ((func_args*)args)->return_code = 0;

        exit(EXIT_SUCCESS);
    }
    
    #if defined(CYASSL_MDK_ARM)
    CyaSSL_CTX_set_verify(ctx, SSL_VERIFY_NONE, 0);
    #endif
    
    ssl = CyaSSL_new(ctx);
    if (ssl == NULL)
        err_sys("unable to get SSL object");
    if (doDTLS) {
        SOCKADDR_IN_T addr;
        build_addr(&addr, host, port, 1);
        CyaSSL_dtls_set_peer(ssl, &addr, sizeof(addr));
        tcp_socket(&sockfd, 1);
    }
    else {
        tcp_connect(&sockfd, host, port, 0);
    }
    CyaSSL_set_fd(ssl, sockfd);
#ifdef HAVE_CRL
    if (CyaSSL_EnableCRL(ssl, CYASSL_CRL_CHECKALL) != SSL_SUCCESS)
        err_sys("can't enable crl check");
    if (CyaSSL_LoadCRL(ssl, crlPemDir, SSL_FILETYPE_PEM, 0) != SSL_SUCCESS)
        err_sys("can't load crl, check crlfile and date validity");
    if (CyaSSL_SetCRL_Cb(ssl, CRL_CallBack) != SSL_SUCCESS)
        err_sys("can't set crl callback");
#endif
#ifdef ATOMIC_USER
    if (atomicUser)
        SetupAtomicUser(ctx, ssl);
#endif
#ifdef HAVE_PK_CALLBACKS
    if (pkCallbacks)
        SetupPkCallbacks(ctx, ssl);
#endif
    if (matchName && doPeerCheck)
        CyaSSL_check_domain_name(ssl, domain);
#ifndef CYASSL_CALLBACKS
    if (nonBlocking) {
        CyaSSL_set_using_nonblock(ssl, 1);
        tcp_set_nonblocking(&sockfd);
        NonBlockingSSL_Connect(ssl);
    }
    else if (CyaSSL_connect(ssl) != SSL_SUCCESS) {
        /* see note at top of README */
        int  err = CyaSSL_get_error(ssl, 0);
        char buffer[CYASSL_MAX_ERROR_SZ];
        printf("err = %d, %s\n", err,
                                CyaSSL_ERR_error_string(err, buffer));
        err_sys("SSL_connect failed");
        /* if you're getting an error here  */
    }
#else
    timeout.tv_sec  = 2;
    timeout.tv_usec = 0;
    NonBlockingSSL_Connect(ssl);  /* will keep retrying on timeout */
#endif
    showPeer(ssl);

    if (sendGET) {
        printf("SSL connect ok, sending GET...\n");
        msgSz = 28;
        strncpy(msg, "GET /index.html HTTP/1.0\r\n\r\n", msgSz);
        msg[msgSz] = '\0';
    }
    if (CyaSSL_write(ssl, msg, msgSz) != msgSz)
        err_sys("SSL_write failed");

    input = CyaSSL_read(ssl, reply, sizeof(reply)-1);
    if (input > 0) {
        reply[input] = 0;
        printf("Server response: %s\n", reply);

        if (sendGET) {  /* get html */
            while (1) {
                input = CyaSSL_read(ssl, reply, sizeof(reply)-1);
                if (input > 0) {
                    reply[input] = 0;
                    printf("%s\n", reply);
                }
                else
                    break;
            }
        }
    }
    else if (input < 0) {
        int readErr = CyaSSL_get_error(ssl, 0);
        if (readErr != SSL_ERROR_WANT_READ)
            err_sys("CyaSSL_read failed");
    }

#ifndef NO_SESSION_CACHE
    if (resumeSession) {
        if (doDTLS) {
            strncpy(msg, "break", 6);
            msgSz = (int)strlen(msg);
            /* try to send session close */
            CyaSSL_write(ssl, msg, msgSz);
        }
        session   = CyaSSL_get_session(ssl);
        sslResume = CyaSSL_new(ctx);
    }
#endif

    if (doDTLS == 0)            /* don't send alert after "break" command */
        CyaSSL_shutdown(ssl);  /* echoserver will interpret as new conn */
#ifdef ATOMIC_USER
    if (atomicUser)
        FreeAtomicUser(ssl);
#endif
    CyaSSL_free(ssl);
    CloseSocket(sockfd);

#ifndef NO_SESSION_CACHE
    if (resumeSession) {
        if (doDTLS) {
            SOCKADDR_IN_T addr;
            #ifdef USE_WINDOWS_API 
                Sleep(500);
            #else
                sleep(1);
            #endif
            build_addr(&addr, host, port, 1);
            CyaSSL_dtls_set_peer(sslResume, &addr, sizeof(addr));
            tcp_socket(&sockfd, 1);
        }
        else {
            tcp_connect(&sockfd, host, port, 0);
        }
        CyaSSL_set_fd(sslResume, sockfd);
        CyaSSL_set_session(sslResume, session);
       
        showPeer(sslResume);
#ifndef CYASSL_CALLBACKS
        if (nonBlocking) {
            CyaSSL_set_using_nonblock(sslResume, 1);
            tcp_set_nonblocking(&sockfd);
            NonBlockingSSL_Connect(sslResume);
        }
        else if (CyaSSL_connect(sslResume) != SSL_SUCCESS)
            err_sys("SSL resume failed");
#else
        timeout.tv_sec  = 2;
        timeout.tv_usec = 0;
        NonBlockingSSL_Connect(ssl);  /* will keep retrying on timeout */
#endif

        if (CyaSSL_session_reused(sslResume))
            printf("reused session id\n");
        else
            printf("didn't reuse session id!!!\n");

        if (CyaSSL_write(sslResume, resumeMsg, resumeSz) != resumeSz)
            err_sys("SSL_write failed");

        if (nonBlocking) {
            /* give server a chance to bounce a message back to client */
            #ifdef USE_WINDOWS_API
                Sleep(500);
            #else
                sleep(1);
            #endif
        }

        input = CyaSSL_read(sslResume, reply, sizeof(reply)-1);
        if (input > 0) {
            reply[input] = 0;
            printf("Server resume response: %s\n", reply);
        }

        /* try to send session break */
        CyaSSL_write(sslResume, msg, msgSz); 

        CyaSSL_shutdown(sslResume);
        CyaSSL_free(sslResume);
        CloseSocket(sockfd);
    }
#endif /* NO_SESSION_CACHE */

    CyaSSL_CTX_free(ctx);

    ((func_args*)args)->return_code = 0;

#ifdef USE_CYASSL_MEMORY
    if (trackMemory)
        ShowMemoryTracker();
#endif /* USE_CYASSL_MEMORY */

    return 0;
}
int main (int argc, char** argv) 
{
    int     		sockfd = 0;
    struct  		sockaddr_in servAddr;
    const char* 	host = argv[1];
    CYASSL* 		ssl = 0;
    CYASSL_CTX* 	ctx = 0;
    CYASSL* 		sslResume = 0;
    CYASSL_SESSION*	session = 0;
    char*    		srTest = "testing session resume";
    char            cert_array[] = "../certs/ca-cert.pem";
    char*           certs = cert_array;
    if (argc != 2) { 
        printf("usage: udpcli <IP address>\n");
        return 1;
    }

    CyaSSL_Init();
    /* CyaSSL_Debugging_ON(); */
   
    if ( (ctx = CyaSSL_CTX_new(CyaDTLSv1_2_client_method())) == NULL) {
        fprintf(stderr, "CyaSSL_CTX_new error.\n");
        return 1;
    }

    if (CyaSSL_CTX_load_verify_locations(ctx, certs, 0) != SSL_SUCCESS) {
        fprintf(stderr, "Error loading %s, please check the file.\n", certs);
        return 1;
    }

    ssl = CyaSSL_new(ctx);
    if (ssl == NULL) {
    	printf("unable to get ssl object");
        return 1;
    }
    
    memset(&servAddr, 0, sizeof(servAddr));
    servAddr.sin_family = AF_INET;
    servAddr.sin_port = htons(SERV_PORT);
    if ( (inet_pton(AF_INET, host, &servAddr.sin_addr)) < 1) {
        printf("Error and/or invalid IP address");
        return 1;
    }

    CyaSSL_dtls_set_peer(ssl, &servAddr, sizeof(servAddr));
    
    if ( (sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 
       printf("cannot create a socket."); 
       return 1;
    }
    
    CyaSSL_set_fd(ssl, sockfd);
    if (CyaSSL_connect(ssl) != SSL_SUCCESS) {
	    int err1 = CyaSSL_get_error(ssl, 0);
	    char buffer[80];
	    printf("err = %d, %s\n", err1, CyaSSL_ERR_error_string(err1, buffer));
	    printf("SSL_connect failed");
        return 1;
    }
    
    DatagramClient(ssl);
    CyaSSL_write(ssl, srTest, sizeof(srTest));
    session = CyaSSL_get_session(ssl);
    sslResume = CyaSSL_new(ctx);

    CyaSSL_shutdown(ssl);
    CyaSSL_free(ssl);
    close(sockfd);

    memset(&servAddr, 0, sizeof(servAddr));
    servAddr.sin_family = AF_INET;
    servAddr.sin_port = htons(SERV_PORT);
    if ( (inet_pton(AF_INET, host, &servAddr.sin_addr)) < 1) {
        printf("Error and/or invalid IP address");
        return 1;
    }

    CyaSSL_dtls_set_peer(sslResume, &servAddr, sizeof(servAddr));
   
    if ( (sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 
        printf("cannot create a socket.");
        return 1;
    } 
    
    CyaSSL_set_fd(sslResume, sockfd);
    CyaSSL_set_session(sslResume, session);

    if (CyaSSL_connect(sslResume) != SSL_SUCCESS) { 
	    printf("SSL_connect failed");
        return 1;
    }

    if(CyaSSL_session_reused(sslResume))
    	printf("reused session id\n");
    else
    	printf("didn't reuse session id!!!\n");
    
    DatagramClient(sslResume);
    
    CyaSSL_write(sslResume, srTest, sizeof(srTest));

    CyaSSL_shutdown(sslResume);
    CyaSSL_free(sslResume);
    
    close(sockfd);
    CyaSSL_CTX_free(ctx);
    CyaSSL_Cleanup();

    return 0;
}