text: /*
   *  SSL client with certificate authentication
   *
   *  Copyright The Mbed TLS Contributors
   *  SPDX-License-Identifier: Apache-2.0
   *
   *  Licensed under the Apache License, Version 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
   *
   *  http://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing, software
   *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *  See the License for the specific language governing permissions and
   *  limitations under the License.
   */
  
  #include "ssl_test_lib.h"
  
  #if defined(MBEDTLS_SSL_TEST_IMPOSSIBLE)
  int main( void )
  {
      mbedtls_printf( MBEDTLS_SSL_TEST_IMPOSSIBLE );
      mbedtls_exit( 0 );
  }
  #elif !defined(MBEDTLS_SSL_CLI_C)
  int main( void )
  {
      mbedtls_printf( "MBEDTLS_SSL_CLI_C not defined.\n" );
      mbedtls_exit( 0 );
  }
  #else /* !MBEDTLS_SSL_TEST_IMPOSSIBLE && MBEDTLS_SSL_CLI_C */
  
  /* Size of memory to be allocated for the heap, when using the library's memory
   * management and MBEDTLS_MEMORY_BUFFER_ALLOC_C is enabled. */
  #define MEMORY_HEAP_SIZE      120000
  
  #define MAX_REQUEST_SIZE      20000
  #define MAX_REQUEST_SIZE_STR "20000"
  
  #define DFL_SERVER_NAME         "localhost"
  #define DFL_SERVER_ADDR         NULL
  #define DFL_SERVER_PORT         "4433"
  #define DFL_REQUEST_PAGE        "/"
  #define DFL_REQUEST_SIZE        -1
  #define DFL_DEBUG_LEVEL         0
  #define DFL_CONTEXT_CRT_CB      0
  #define DFL_NBIO                0
  #define DFL_EVENT               0
  #define DFL_READ_TIMEOUT        0
  #define DFL_MAX_RESEND          0
  #define DFL_CA_FILE             ""
  #define DFL_CA_PATH             ""
  #define DFL_CRT_FILE            ""
  #define DFL_KEY_FILE            ""
  #define DFL_KEY_OPAQUE          0
  #define DFL_KEY_PWD             ""
  #define DFL_PSK                 ""
  #define DFL_PSK_OPAQUE          0
  #define DFL_PSK_IDENTITY        "Client_identity"
  #define DFL_ECJPAKE_PW          NULL
  #define DFL_EC_MAX_OPS          -1
  #define DFL_FORCE_CIPHER        0
  #define DFL_RENEGOTIATION       MBEDTLS_SSL_RENEGOTIATION_DISABLED
  #define DFL_ALLOW_LEGACY        -2
  #define DFL_RENEGOTIATE         0
  #define DFL_EXCHANGES           1
  #define DFL_MIN_VERSION         -1
  #define DFL_MAX_VERSION         -1
  #define DFL_ARC4                -1
  #define DFL_SHA1                -1
  #define DFL_AUTH_MODE           -1
  #define DFL_MFL_CODE            MBEDTLS_SSL_MAX_FRAG_LEN_NONE
  #define DFL_TRUNC_HMAC          -1
  #define DFL_RECSPLIT            -1
  #define DFL_DHMLEN              -1
  #define DFL_RECONNECT           0
  #define DFL_RECO_DELAY          0
  #define DFL_RECO_MODE           1
  #define DFL_CID_ENABLED         0
  #define DFL_CID_VALUE           ""
  #define DFL_CID_ENABLED_RENEGO  -1
  #define DFL_CID_VALUE_RENEGO    NULL
  #define DFL_RECONNECT_HARD      0
  #define DFL_TICKETS             MBEDTLS_SSL_SESSION_TICKETS_ENABLED
  #define DFL_ALPN_STRING         NULL
  #define DFL_CURVES              NULL
  #define DFL_TRANSPORT           MBEDTLS_SSL_TRANSPORT_STREAM
  #define DFL_HS_TO_MIN           0
  #define DFL_HS_TO_MAX           0
  #define DFL_DTLS_MTU            -1
  #define DFL_DGRAM_PACKING        1
  #define DFL_FALLBACK            -1
  #define DFL_EXTENDED_MS         -1
  #define DFL_ETM                 -1
  #define DFL_SERIALIZE           0
  #define DFL_CONTEXT_FILE        ""
  #define DFL_EXTENDED_MS_ENFORCE -1
  #define DFL_CA_CALLBACK         0
  #define DFL_EAP_TLS             0
  #define DFL_REPRODUCIBLE        0
  #define DFL_NSS_KEYLOG          0
  #define DFL_NSS_KEYLOG_FILE     NULL
  #define DFL_SKIP_CLOSE_NOTIFY   0
  #define DFL_QUERY_CONFIG_MODE   0
  #define DFL_USE_SRTP            0
  #define DFL_SRTP_FORCE_PROFILE  0
  #define DFL_SRTP_MKI            ""
  
  #define GET_REQUEST "GET %s HTTP/1.0\r\nExtra-header: "
  #define GET_REQUEST_END "\r\n\r\n"
  
  #if defined(MBEDTLS_X509_CRT_PARSE_C)
  #define USAGE_CONTEXT_CRT_CB \
      "    context_crt_cb=%%d   This determines whether the CRT verification callback is bound\n" \
      "                        to the SSL configuration of the SSL context.\n" \
      "                        Possible values:\n"\
      "                        - 0 (default): Use CRT callback bound to configuration\n" \
      "                        - 1: Use CRT callback bound to SSL context\n"
  #else
  #define USAGE_CONTEXT_CRT_CB ""
  #endif /* MBEDTLS_X509_CRT_PARSE_C */
  #if defined(MBEDTLS_X509_CRT_PARSE_C)
  #if defined(MBEDTLS_FS_IO)
  #define USAGE_IO \
      "    ca_file=%%s          The single file containing the top-level CA(s) you fully trust\n" \
      "                        default: \"\" (pre-loaded)\n" \
      "                        use \"none\" to skip loading any top-level CAs.\n" \
      "    ca_path=%%s          The path containing the top-level CA(s) you fully trust\n" \
      "                        default: \"\" (pre-loaded) (overrides ca_file)\n" \
      "                        use \"none\" to skip loading any top-level CAs.\n" \
      "    crt_file=%%s         Your own cert and chain (in bottom to top order, top may be omitted)\n" \
      "                        default: \"\" (pre-loaded)\n" \
      "    key_file=%%s         default: \"\" (pre-loaded)\n"\
      "    key_pwd=%%s          Password for key specified by key_file argument\n"\
      "                        default: none\n"
  #else
  #define USAGE_IO \
      "    No file operations available (MBEDTLS_FS_IO not defined)\n"
  #endif /* MBEDTLS_FS_IO */
  #else /* MBEDTLS_X509_CRT_PARSE_C */
  #define USAGE_IO ""
  #endif /* MBEDTLS_X509_CRT_PARSE_C */
  #if defined(MBEDTLS_USE_PSA_CRYPTO) && defined(MBEDTLS_X509_CRT_PARSE_C)
  #define USAGE_KEY_OPAQUE \
      "    key_opaque=%%d       Handle your private key as if it were opaque\n" \
      "                        default: 0 (disabled)\n"
  #else
  #define USAGE_KEY_OPAQUE ""
  #endif
  
  #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
  #define USAGE_CID \
      "    cid=%%d             Disable (0) or enable (1) the use of the DTLS Connection ID extension.\n" \
      "                       default: 0 (disabled)\n"     \
      "    cid_renego=%%d      Disable (0) or enable (1) the use of the DTLS Connection ID extension during renegotiation.\n" \
      "                       default: same as 'cid' parameter\n"     \
      "    cid_val=%%s          The CID to use for incoming messages (in hex, without 0x).\n"  \
      "                        default: \"\"\n" \
      "    cid_val_renego=%%s   The CID to use for incoming messages (in hex, without 0x) after renegotiation.\n"  \
      "                        default: same as 'cid_val' parameter\n"
  #else /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
  #define USAGE_CID ""
  #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
  
  #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
  #define USAGE_PSK_RAW                                               \
      "    psk=%%s              default: \"\" (disabled)\n"     \
      "                          The PSK values are in hex, without 0x.\n" \
      "    psk_identity=%%s     default: \"Client_identity\"\n"
  #if defined(MBEDTLS_USE_PSA_CRYPTO)
  #define USAGE_PSK_SLOT                          \
      "    psk_opaque=%%d       default: 0 (don't use opaque static PSK)\n"     \
      "                          Enable this to store the PSK configured through command line\n" \
      "                          parameter `psk` in a PSA-based key slot.\n" \
      "                          Note: Currently only supported in conjunction with\n"                  \
      "                          the use of min_version to force TLS 1.2 and force_ciphersuite \n"      \
      "                          to force a particular PSK-only ciphersuite.\n"                         \
      "                          Note: This is to test integration of PSA-based opaque PSKs with\n"     \
      "                          Mbed TLS only. Production systems are likely to configure Mbed TLS\n"  \
      "                          with prepopulated key slots instead of importing raw key material.\n"
  #else
  #define USAGE_PSK_SLOT ""
  #endif /* MBEDTLS_USE_PSA_CRYPTO */
  #define USAGE_PSK USAGE_PSK_RAW USAGE_PSK_SLOT
  #else
  #define USAGE_PSK ""
  #endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
  
  #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
  #define USAGE_CA_CALLBACK                       \
      "   ca_callback=%%d       default: 0 (disabled)\n"      \
      "                         Enable this to use the trusted certificate callback function\n"
  #else
  #define USAGE_CA_CALLBACK ""
  #endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
  
  #if defined(MBEDTLS_SSL_SESSION_TICKETS)
  #define USAGE_TICKETS                                       \
      "    tickets=%%d          default: 1 (enabled)\n"
  #else
  #define USAGE_TICKETS ""
  #endif /* MBEDTLS_SSL_SESSION_TICKETS */
  
  #if defined(MBEDTLS_SSL_EXPORT_KEYS)
  #define USAGE_EAP_TLS                                       \
      "    eap_tls=%%d          default: 0 (disabled)\n"
  #define USAGE_NSS_KEYLOG                                    \
      "    nss_keylog=%%d          default: 0 (disabled)\n"               \
      "                             This cannot be used with eap_tls=1\n"
  #define USAGE_NSS_KEYLOG_FILE                               \
      "    nss_keylog_file=%%s\n"
  #if defined(MBEDTLS_SSL_DTLS_SRTP)
  #define USAGE_SRTP \
      "    use_srtp=%%d         default: 0 (disabled)\n" \
      "                          This cannot be used with eap_tls=1 or "\
      "                          nss_keylog=1\n"             \
      "    srtp_force_profile=%%d  default: 0 (all enabled)\n"   \
      "                        available profiles:\n"       \
      "                        1 - SRTP_AES128_CM_HMAC_SHA1_80\n"  \
      "                        2 - SRTP_AES128_CM_HMAC_SHA1_32\n"  \
      "                        3 - SRTP_NULL_HMAC_SHA1_80\n"       \
      "                        4 - SRTP_NULL_HMAC_SHA1_32\n"       \
      "    mki=%%s              default: \"\" (in hex, without 0x)\n"
  #else /* MBEDTLS_SSL_DTLS_SRTP */
  #define USAGE_SRTP ""
  #endif
  #else /* MBEDTLS_SSL_EXPORT_KEYS */
  #define USAGE_EAP_TLS ""
  #define USAGE_NSS_KEYLOG ""
  #define USAGE_NSS_KEYLOG_FILE ""
  #define USAGE_SRTP ""
  #endif /* MBEDTLS_SSL_EXPORT_KEYS */
  
  #if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
  #define USAGE_TRUNC_HMAC                                    \
      "    trunc_hmac=%%d       default: library default\n"
  #else
  #define USAGE_TRUNC_HMAC ""
  #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
  
  #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
  #define USAGE_MAX_FRAG_LEN                                      \
      "    max_frag_len=%%d     default: 16384 (tls default)\n"   \
      "                        options: 512, 1024, 2048, 4096\n"
  #else
  #define USAGE_MAX_FRAG_LEN ""
  #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
  
  #if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
  #define USAGE_RECSPLIT \
      "    recsplit=0/1        default: (library default: on)\n"
  #else
  #define USAGE_RECSPLIT
  #endif
  
  #if defined(MBEDTLS_DHM_C)
  #define USAGE_DHMLEN \
      "    dhmlen=%%d           default: (library default: 1024 bits)\n"
  #else
  #define USAGE_DHMLEN
  #endif
  
  #if defined(MBEDTLS_SSL_ALPN)
  #define USAGE_ALPN \
      "    alpn=%%s             default: \"\" (disabled)\n"   \
      "                        example: spdy/1,http/1.1\n"
  #else
  #define USAGE_ALPN ""
  #endif /* MBEDTLS_SSL_ALPN */
  
  #if defined(MBEDTLS_ECP_C)
  #define USAGE_CURVES \
      "    curves=a,b,c,d      default: \"default\" (library default)\n"  \
      "                        example: \"secp521r1,brainpoolP512r1\"\n"  \
      "                        - use \"none\" for empty list\n"           \
      "                        - see mbedtls_ecp_curve_list()\n"          \
      "                          for acceptable curve names\n"
  #else
  #define USAGE_CURVES ""
  #endif
  
  #if defined(MBEDTLS_SSL_PROTO_DTLS)
  #define USAGE_DTLS \
      "    dtls=%%d             default: 0 (TLS)\n"                           \
      "    hs_timeout=%%d-%%d    default: (library default: 1000-60000)\n"    \
      "                        range of DTLS handshake timeouts in millisecs\n" \
      "    mtu=%%d              default: (library default: unlimited)\n"  \
      "    dgram_packing=%%d    default: 1 (allowed)\n"                   \
      "                        allow or forbid packing of multiple\n" \
      "                        records within a single datgram.\n"
  #else
  #define USAGE_DTLS ""
  #endif
  
  #if defined(MBEDTLS_SSL_FALLBACK_SCSV)
  #define USAGE_FALLBACK \
      "    fallback=0/1        default: (library default: off)\n"
  #else
  #define USAGE_FALLBACK ""
  #endif
  
  #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
  #define USAGE_EMS \
      "    extended_ms=0/1     default: (library default: on)\n"
  #else
  #define USAGE_EMS ""
  #endif
  
  #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
  #define USAGE_ETM \
      "    etm=0/1             default: (library default: on)\n"
  #else
  #define USAGE_ETM ""
  #endif
  
  #define USAGE_REPRODUCIBLE \
      "    reproducible=0/1     default: 0 (disabled)\n"
  
  #if defined(MBEDTLS_SSL_RENEGOTIATION)
  #define USAGE_RENEGO \
      "    renegotiation=%%d    default: 0 (disabled)\n"      \
      "    renegotiate=%%d      default: 0 (disabled)\n"
  #else
  #define USAGE_RENEGO ""
  #endif
  
  #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
  #define USAGE_ECJPAKE \
      "    ecjpake_pw=%%s       default: none (disabled)\n"
  #else
  #define USAGE_ECJPAKE ""
  #endif
  
  #if defined(MBEDTLS_ECP_RESTARTABLE)
  #define USAGE_ECRESTART \
      "    ec_max_ops=%%s       default: library default (restart disabled)\n"
  #else
  #define USAGE_ECRESTART ""
  #endif
  
  #if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION)
  #define USAGE_SERIALIZATION \
      "    serialize=%%d        default: 0 (do not serialize/deserialize)\n"     \
      "                        options: 1 (serialize)\n"                         \
      "                                 2 (serialize with re-initialization)\n"  \
      "    context_file=%%s     The file path to write a serialized connection\n"\
      "                        in the form of base64 code (serialize option\n"   \
      "                        must be set)\n"                                   \
      "                         default: \"\" (do nothing)\n"                    \
      "                         option: a file path\n"
  #else
  #define USAGE_SERIALIZATION ""
  #endif
  
  /* USAGE is arbitrarily split to stay under the portable string literal
   * length limit: 4095 bytes in C99. */
  #define USAGE1 \
      "\n usage: ssl_client2 param=<>...\n"                   \
      "\n acceptable parameters:\n"                           \
      "    server_name=%%s      default: localhost\n"         \
      "    server_addr=%%s      default: given by name\n"     \
      "    server_port=%%d      default: 4433\n"              \
      "    request_page=%%s     default: \".\"\n"             \
      "    request_size=%%d     default: about 34 (basic request)\n"           \
      "                        (minimum: 0, max: " MAX_REQUEST_SIZE_STR ")\n"  \
      "                        If 0, in the first exchange only an empty\n"    \
      "                        application data message is sent followed by\n" \
      "                        a second non-empty message before attempting\n" \
      "                        to read a response from the server\n"           \
      "    debug_level=%%d      default: 0 (disabled)\n"             \
      "    nbio=%%d             default: 0 (blocking I/O)\n"         \
      "                        options: 1 (non-blocking), 2 (added delays)\n"   \
      "    event=%%d            default: 0 (loop)\n"                            \
      "                        options: 1 (level-triggered, implies nbio=1),\n" \
      "    read_timeout=%%d     default: 0 ms (no timeout)\n"        \
      "    max_resend=%%d       default: 0 (no resend on timeout)\n" \
      "    skip_close_notify=%%d default: 0 (send close_notify)\n" \
      "\n"                                                    \
      USAGE_DTLS                                              \
      USAGE_CID                                               \
      USAGE_SRTP                                              \
      "\n"
  #define USAGE2 \
      "    auth_mode=%%s        default: (library default: none)\n" \
      "                        options: none, optional, required\n" \
      USAGE_IO                                                \
      USAGE_KEY_OPAQUE                                        \
      USAGE_CA_CALLBACK                                       \
      "\n"                                                    \
      USAGE_PSK                                               \
      USAGE_ECJPAKE                                           \
      USAGE_ECRESTART                                         \
      "\n"
  #define USAGE3 \
      "    allow_legacy=%%d     default: (library default: no)\n"   \
      USAGE_RENEGO                                            \
      "    exchanges=%%d        default: 1\n"                 \
      "    reconnect=%%d        number of reconnections using session resumption\n" \
      "                        default: 0 (disabled)\n"      \
      "    reco_delay=%%d       default: 0 seconds\n"         \
      "    reco_mode=%%d        0: copy session, 1: serialize session\n" \
      "                        default: 1\n"      \
      "    reconnect_hard=%%d   default: 0 (disabled)\n"      \
      USAGE_TICKETS                                           \
      USAGE_EAP_TLS                                           \
      USAGE_MAX_FRAG_LEN                                      \
      USAGE_TRUNC_HMAC                                        \
      USAGE_CONTEXT_CRT_CB                                    \
      USAGE_ALPN                                              \
      USAGE_FALLBACK                                          \
      USAGE_EMS                                               \
      USAGE_ETM                                               \
      USAGE_REPRODUCIBLE                                      \
      USAGE_CURVES                                            \
      USAGE_RECSPLIT                                          \
      USAGE_DHMLEN                                            \
      "\n"
  #define USAGE4 \
      "    arc4=%%d             default: (library default: 0)\n" \
      "    allow_sha1=%%d       default: 0\n"                             \
      "    min_version=%%s      default: (library default: tls1)\n"       \
      "    max_version=%%s      default: (library default: tls1_2)\n"     \
      "    force_version=%%s    default: \"\" (none)\n"       \
      "                        options: ssl3, tls1, tls1_1, tls1_2, dtls1, dtls1_2\n" \
      "\n"                                                    \
      "    force_ciphersuite=<name>    default: all enabled\n"\
      "    query_config=<name>         return 0 if the specified\n"       \
      "                                configuration macro is defined and 1\n"  \
      "                                otherwise. The expansion of the macro\n" \
      "                                is printed if it is defined\n"     \
      USAGE_SERIALIZATION                                     \
      " acceptable ciphersuite names:\n"
  
  #define ALPN_LIST_SIZE  10
  #define CURVE_LIST_SIZE 20
  
  
  /*
   * global options
   */
  struct options
  {
      const char *server_name;    /* hostname of the server (client only)     */
      const char *server_addr;    /* address of the server (client only)      */
      const char *server_port;    /* port on which the ssl service runs       */
      int debug_level;            /* level of debugging                       */
      int nbio;                   /* should I/O be blocking?                  */
      int event;                  /* loop or event-driven IO? level or edge triggered? */
      uint32_t read_timeout;      /* timeout on mbedtls_ssl_read() in milliseconds     */
      int max_resend;             /* DTLS times to resend on read timeout     */
      const char *request_page;   /* page on server to request                */
      int request_size;           /* pad request with header to requested size */
      const char *ca_file;        /* the file with the CA certificate(s)      */
      const char *ca_path;        /* the path with the CA certificate(s) reside */
      const char *crt_file;       /* the file with the client certificate     */
      const char *key_file;       /* the file with the client key             */
      int key_opaque;             /* handle private key as if it were opaque  */
  #if defined(MBEDTLS_USE_PSA_CRYPTO)
      int psk_opaque;
  #endif
  #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
      int ca_callback;            /* Use callback for trusted certificate list */
  #endif
      const char *key_pwd;        /* the password for the client key          */
      const char *psk;            /* the pre-shared key                       */
      const char *psk_identity;   /* the pre-shared key identity              */
      const char *ecjpake_pw;     /* the EC J-PAKE password                   */
      int ec_max_ops;             /* EC consecutive operations limit          */
      int force_ciphersuite[2];   /* protocol/ciphersuite to use, or all      */
      int renegotiation;          /* enable / disable renegotiation           */
      int allow_legacy;           /* allow legacy renegotiation               */
      int renegotiate;            /* attempt renegotiation?                   */
      int renego_delay;           /* delay before enforcing renegotiation     */
      int exchanges;              /* number of data exchanges                 */
      int min_version;            /* minimum protocol version accepted        */
      int max_version;            /* maximum protocol version accepted        */
      int arc4;                   /* flag for arc4 suites support             */
      int allow_sha1;             /* flag for SHA-1 support                   */
      int auth_mode;              /* verify mode for connection               */
      unsigned char mfl_code;     /* code for maximum fragment length         */
      int trunc_hmac;             /* negotiate truncated hmac or not          */
      int recsplit;               /* enable record splitting?                 */
      int dhmlen;                 /* minimum DHM params len in bits           */
      int reconnect;              /* attempt to resume session                */
      int reco_delay;             /* delay in seconds before resuming session */
      int reco_mode;              /* how to keep the session around           */
      int reconnect_hard;         /* unexpectedly reconnect from the same port */
      int tickets;                /* enable / disable session tickets         */
      const char *curves;         /* list of supported elliptic curves        */
      const char *alpn_string;    /* ALPN supported protocols                 */
      int transport;              /* TLS or DTLS?                             */
      uint32_t hs_to_min;         /* Initial value of DTLS handshake timer    */
      uint32_t hs_to_max;         /* Max value of DTLS handshake timer        */
      int dtls_mtu;               /* UDP Maximum tranport unit for DTLS       */
      int fallback;               /* is this a fallback connection?           */
      int dgram_packing;          /* allow/forbid datagram packing            */
      int extended_ms;            /* negotiate extended master secret?        */
      int etm;                    /* negotiate encrypt then mac?              */
      int context_crt_cb;         /* use context-specific CRT verify callback */
      int eap_tls;                /* derive EAP-TLS keying material?          */
      int nss_keylog;             /* export NSS key log material              */
      const char *nss_keylog_file; /* NSS key log file                        */
      int cid_enabled;            /* whether to use the CID extension or not  */
      int cid_enabled_renego;     /* whether to use the CID extension or not
                                   * during renegotiation                     */
      const char *cid_val;        /* the CID to use for incoming messages     */
      int serialize;              /* serialize/deserialize connection         */
      const char *context_file;   /* the file to write a serialized connection
                                   * in the form of base64 code (serialize
                                   * option must be set)                      */
      const char *cid_val_renego; /* the CID to use for incoming messages
                                   * after renegotiation                      */
      int reproducible;           /* make communication reproducible          */
      int skip_close_notify;      /* skip sending the close_notify alert      */
      int query_config_mode;      /* whether to read config                   */
      int use_srtp;               /* Support SRTP                             */
      int force_srtp_profile;     /* SRTP protection profile to use or all    */
      const char *mki;            /* The dtls mki value to use                */
  } opt;
  
  #include "ssl_test_common_source.c"
  
  #if defined(MBEDTLS_X509_CRT_PARSE_C)
  static unsigned char peer_crt_info[1024];
  
  /*
   * Enabled if debug_level > 1 in code below
   */
  static int my_verify( void *data, mbedtls_x509_crt *crt,
                        int depth, uint32_t *flags )
  {
      char buf[1024];
      ((void) data);
  
      mbedtls_x509_crt_info( buf, sizeof( buf ) - 1, "", crt );
      if( depth == 0 )
          memcpy( peer_crt_info, buf, sizeof( buf ) );
  
      if( opt.debug_level == 0 )
          return( 0 );
  
      mbedtls_printf( "\nVerify requested for (Depth %d):\n", depth );
      mbedtls_printf( "%s", buf );
  
      if ( ( *flags ) == 0 )
          mbedtls_printf( "  This certificate has no flags\n" );
      else
      {
          mbedtls_x509_crt_verify_info( buf, sizeof( buf ), "  ! ", *flags );
          mbedtls_printf( "%s\n", buf );
      }
  
      return( 0 );
  }
  #endif /* MBEDTLS_X509_CRT_PARSE_C */
  
  #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
  int report_cid_usage( mbedtls_ssl_context *ssl,
                        const char *additional_description )
  {
      int ret;
      unsigned char peer_cid[ MBEDTLS_SSL_CID_OUT_LEN_MAX ];
      size_t peer_cid_len;
      int cid_negotiated;
  
      if( opt.transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM )
          return( 0 );
  
      /* Check if the use of a CID has been negotiated,
       * but don't ask for the CID value and length.
       *
       * Note: Here and below, we're demonstrating the various ways
       *       in which mbedtls_ssl_get_peer_cid() can be called,
       *       depending on whether or not the length/value of the
       *       peer's CID is needed.
       *
       *       An actual application, however, should use
       *       just one call to mbedtls_ssl_get_peer_cid(). */
      ret = mbedtls_ssl_get_peer_cid( ssl, &cid_negotiated,
                                      NULL, NULL );
      if( ret != 0 )
      {
          mbedtls_printf( " failed\n  ! mbedtls_ssl_get_peer_cid returned -0x%x\n\n",
                          (unsigned int) -ret );
          return( ret );
      }
  
      if( cid_negotiated == MBEDTLS_SSL_CID_DISABLED )
      {
          if( opt.cid_enabled == MBEDTLS_SSL_CID_ENABLED )
          {
              mbedtls_printf( "(%s) Use of Connection ID was rejected by the server.\n",
                              additional_description );
          }
      }
      else
      {
          size_t idx=0;
          mbedtls_printf( "(%s) Use of Connection ID has been negotiated.\n",
                          additional_description );
  
          /* Ask for just the length of the peer's CID. */
          ret = mbedtls_ssl_get_peer_cid( ssl, &cid_negotiated,
                                          NULL, &peer_cid_len );
          if( ret != 0 )
          {
              mbedtls_printf( " failed\n  ! mbedtls_ssl_get_peer_cid returned -0x%x\n\n",
                              (unsigned int) -ret );
              return( ret );
          }
  
          /* Ask for just length + value of the peer's CID. */
          ret = mbedtls_ssl_get_peer_cid( ssl, &cid_negotiated,
                                          peer_cid, &peer_cid_len );
          if( ret != 0 )
          {
              mbedtls_printf( " failed\n  ! mbedtls_ssl_get_peer_cid returned -0x%x\n\n",
                              (unsigned int) -ret );
              return( ret );
          }
          mbedtls_printf( "(%s) Peer CID (length %u Bytes): ",
                          additional_description,
                          (unsigned) peer_cid_len );
          while( idx < peer_cid_len )
          {
              mbedtls_printf( "%02x ", peer_cid[ idx ] );
              idx++;
          }
          mbedtls_printf( "\n" );
      }
  
      return( 0 );
  }
  #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
  
  int main( int argc, char *argv[] )
  {
      int ret = 0, len, tail_len, i, written, frags, retry_left;
      int query_config_ret = 0;
      mbedtls_net_context server_fd;
      io_ctx_t io_ctx;
  
      unsigned char buf[MAX_REQUEST_SIZE + 1];
  
  #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
      unsigned char psk[MBEDTLS_PSK_MAX_LEN];
      size_t psk_len = 0;
  #endif
  
  #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
      unsigned char cid[MBEDTLS_SSL_CID_IN_LEN_MAX];
      unsigned char cid_renego[MBEDTLS_SSL_CID_IN_LEN_MAX];
      size_t cid_len = 0;
      size_t cid_renego_len = 0;
  #endif
  
  #if defined(MBEDTLS_SSL_ALPN)
      const char *alpn_list[ALPN_LIST_SIZE];
  #endif
  
  #if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
      unsigned char alloc_buf[MEMORY_HEAP_SIZE];
  #endif
  
  #if defined(MBEDTLS_ECP_C)
      mbedtls_ecp_group_id curve_list[CURVE_LIST_SIZE];
      const mbedtls_ecp_curve_info *curve_cur;
  #endif
  #if defined(MBEDTLS_SSL_DTLS_SRTP)
      unsigned char mki[MBEDTLS_TLS_SRTP_MAX_MKI_LENGTH];
      size_t mki_len=0;
  #endif
  
      const char *pers = "ssl_client2";
  
  #if defined(MBEDTLS_USE_PSA_CRYPTO)
      psa_key_id_t slot = 0;
      psa_algorithm_t alg = 0;
      psa_key_attributes_t key_attributes;
      psa_status_t status;
  #endif
  
  #if defined(MBEDTLS_X509_CRT_PARSE_C)
      mbedtls_x509_crt_profile crt_profile_for_test = mbedtls_x509_crt_profile_default;
  #endif
      mbedtls_entropy_context entropy;
      mbedtls_ctr_drbg_context ctr_drbg;
      mbedtls_ssl_context ssl;
      mbedtls_ssl_config conf;
      mbedtls_ssl_session saved_session;
      unsigned char *session_data = NULL;
      size_t session_data_len = 0;
  #if defined(MBEDTLS_TIMING_C)
      mbedtls_timing_delay_context timer;
  #endif
  #if defined(MBEDTLS_X509_CRT_PARSE_C)
      uint32_t flags;
      mbedtls_x509_crt cacert;
      mbedtls_x509_crt clicert;
      mbedtls_pk_context pkey;
  #if defined(MBEDTLS_USE_PSA_CRYPTO)
      psa_key_id_t key_slot = 0; /* invalid key slot */
  #endif
  #endif
      char *p, *q;
      const int *list;
  #if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION)
      unsigned char *context_buf = NULL;
      size_t context_buf_len;
  #endif
  #if defined(MBEDTLS_SSL_EXPORT_KEYS)
      unsigned char eap_tls_keymaterial[16];
      unsigned char eap_tls_iv[8];
      const char* eap_tls_label = "client EAP encryption";
      eap_tls_keys eap_tls_keying;
  #if defined( MBEDTLS_SSL_DTLS_SRTP )
      /*! master keys and master salt for SRTP generated during handshake */
      unsigned char dtls_srtp_key_material[MBEDTLS_TLS_SRTP_MAX_KEY_MATERIAL_LENGTH];
      const char* dtls_srtp_label = "EXTRACTOR-dtls_srtp";
      dtls_srtp_keys dtls_srtp_keying;
      const mbedtls_ssl_srtp_profile default_profiles[] = {
          MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_80,
          MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_32,
          MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_80,
          MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_32,
          MBEDTLS_TLS_SRTP_UNSET
      };
  #endif /* MBEDTLS_SSL_DTLS_SRTP */
  #endif /* MBEDTLS_SSL_EXPORT_KEYS */
  
  #if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
      mbedtls_memory_buffer_alloc_init( alloc_buf, sizeof(alloc_buf) );
  #endif
  
      /*
       * Make sure memory references are valid.
       */
      mbedtls_net_init( &server_fd );
      mbedtls_ssl_init( &ssl );
      mbedtls_ssl_config_init( &conf );
      memset( &saved_session, 0, sizeof( mbedtls_ssl_session ) );
      mbedtls_ctr_drbg_init( &ctr_drbg );
  #if defined(MBEDTLS_X509_CRT_PARSE_C)
      mbedtls_x509_crt_init( &cacert );
      mbedtls_x509_crt_init( &clicert );
      mbedtls_pk_init( &pkey );
  #endif
  #if defined(MBEDTLS_SSL_ALPN)
      memset( (void * ) alpn_list, 0, sizeof( alpn_list ) );
  #endif
  
  #if defined(MBEDTLS_USE_PSA_CRYPTO)
      status = psa_crypto_init();
      if( status != PSA_SUCCESS )
      {
          mbedtls_fprintf( stderr, "Failed to initialize PSA Crypto implementation: %d\n",
                           (int) status );
          ret = MBEDTLS_ERR_SSL_HW_ACCEL_FAILED;
          goto exit;
      }
  #endif
  
      if( argc == 0 )
      {
      usage:
          if( ret == 0 )
              ret = 1;
  
          mbedtls_printf( USAGE1 );
          mbedtls_printf( USAGE2 );
          mbedtls_printf( USAGE3 );
          mbedtls_printf( USAGE4 );
  
          list = mbedtls_ssl_list_ciphersuites();
          while( *list )
          {
              mbedtls_printf(" %-42s", mbedtls_ssl_get_ciphersuite_name( *list ) );
              list++;
              if( !*list )
                  break;
              mbedtls_printf(" %s\n", mbedtls_ssl_get_ciphersuite_name( *list ) );
              list++;
          }
          mbedtls_printf("\n");
          goto exit;
      }
  
      opt.server_name         = DFL_SERVER_NAME;
      opt.server_addr         = DFL_SERVER_ADDR;
      opt.server_port         = DFL_SERVER_PORT;
      opt.debug_level         = DFL_DEBUG_LEVEL;
      opt.cid_enabled         = DFL_CID_ENABLED;
      opt.cid_val             = DFL_CID_VALUE;
      opt.cid_enabled_renego  = DFL_CID_ENABLED_RENEGO;
      opt.cid_val_renego      = DFL_CID_VALUE_RENEGO;
      opt.nbio                = DFL_NBIO;
      opt.event               = DFL_EVENT;
      opt.context_crt_cb      = DFL_CONTEXT_CRT_CB;
      opt.read_timeout        = DFL_READ_TIMEOUT;
      opt.max_resend          = DFL_MAX_RESEND;
      opt.request_page        = DFL_REQUEST_PAGE;
      opt.request_size        = DFL_REQUEST_SIZE;
      opt.ca_file             = DFL_CA_FILE;
      opt.ca_path             = DFL_CA_PATH;
      opt.crt_file            = DFL_CRT_FILE;
      opt.key_file            = DFL_KEY_FILE;
      opt.key_opaque          = DFL_KEY_OPAQUE;
      opt.key_pwd             = DFL_KEY_PWD;
      opt.psk                 = DFL_PSK;
  #if defined(MBEDTLS_USE_PSA_CRYPTO)
      opt.psk_opaque          = DFL_PSK_OPAQUE;
  #endif
  #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
      opt.ca_callback         = DFL_CA_CALLBACK;
  #endif
      opt.psk_identity        = DFL_PSK_IDENTITY;
      opt.ecjpake_pw          = DFL_ECJPAKE_PW;
      opt.ec_max_ops          = DFL_EC_MAX_OPS;
      opt.force_ciphersuite[0]= DFL_FORCE_CIPHER;
      opt.renegotiation       = DFL_RENEGOTIATION;
      opt.allow_legacy        = DFL_ALLOW_LEGACY;
      opt.renegotiate         = DFL_RENEGOTIATE;
      opt.exchanges           = DFL_EXCHANGES;
      opt.min_version         = DFL_MIN_VERSION;
      opt.max_version         = DFL_MAX_VERSION;
      opt.arc4                = DFL_ARC4;
      opt.allow_sha1          = DFL_SHA1;
      opt.auth_mode           = DFL_AUTH_MODE;
      opt.mfl_code            = DFL_MFL_CODE;
      opt.trunc_hmac          = DFL_TRUNC_HMAC;
      opt.recsplit            = DFL_RECSPLIT;
      opt.dhmlen              = DFL_DHMLEN;
      opt.reconnect           = DFL_RECONNECT;
      opt.reco_delay          = DFL_RECO_DELAY;
      opt.reco_mode           = DFL_RECO_MODE;
      opt.reconnect_hard      = DFL_RECONNECT_HARD;
      opt.tickets             = DFL_TICKETS;
      opt.alpn_string         = DFL_ALPN_STRING;
      opt.curves              = DFL_CURVES;
      opt.transport           = DFL_TRANSPORT;
      opt.hs_to_min           = DFL_HS_TO_MIN;
      opt.hs_to_max           = DFL_HS_TO_MAX;
      opt.dtls_mtu            = DFL_DTLS_MTU;
      opt.fallback            = DFL_FALLBACK;
      opt.extended_ms         = DFL_EXTENDED_MS;
      opt.etm                 = DFL_ETM;
      opt.dgram_packing       = DFL_DGRAM_PACKING;
      opt.serialize           = DFL_SERIALIZE;
      opt.context_file        = DFL_CONTEXT_FILE;
      opt.eap_tls             = DFL_EAP_TLS;
      opt.reproducible        = DFL_REPRODUCIBLE;
      opt.nss_keylog          = DFL_NSS_KEYLOG;
      opt.nss_keylog_file     = DFL_NSS_KEYLOG_FILE;
      opt.skip_close_notify   = DFL_SKIP_CLOSE_NOTIFY;
      opt.query_config_mode   = DFL_QUERY_CONFIG_MODE;
      opt.use_srtp            = DFL_USE_SRTP;
      opt.force_srtp_profile  = DFL_SRTP_FORCE_PROFILE;
      opt.mki                 = DFL_SRTP_MKI;
  
      for( i = 1; i < argc; i++ )
      {
          p = argv[i];
          if( ( q = strchr( p, '=' ) ) == NULL )
              goto usage;
          *q++ = '\0';
  
          if( strcmp( p, "server_name" ) == 0 )
              opt.server_name = q;
          else if( strcmp( p, "server_addr" ) == 0 )
              opt.server_addr = q;
          else if( strcmp( p, "server_port" ) == 0 )
              opt.server_port = q;
          else if( strcmp( p, "dtls" ) == 0 )
          {
              int t = atoi( q );
              if( t == 0 )
                  opt.transport = MBEDTLS_SSL_TRANSPORT_STREAM;
              else if( t == 1 )
                  opt.transport = MBEDTLS_SSL_TRANSPORT_DATAGRAM;
              else
                  goto usage;
          }
          else if( strcmp( p, "debug_level" ) == 0 )
          {
              opt.debug_level = atoi( q );
              if( opt.debug_level < 0 || opt.debug_level > 65535 )
                  goto usage;
          }
          else if( strcmp( p, "context_crt_cb" ) == 0 )
          {
              opt.context_crt_cb = atoi( q );
              if( opt.context_crt_cb != 0 && opt.context_crt_cb != 1 )
                  goto usage;
          }
          else if( strcmp( p, "nbio" ) == 0 )
          {
              opt.nbio = atoi( q );
              if( opt.nbio < 0 || opt.nbio > 2 )
                  goto usage;
          }
          else if( strcmp( p, "event" ) == 0 )
          {
              opt.event = atoi( q );
              if( opt.event < 0 || opt.event > 2 )
                  goto usage;
          }
          else if( strcmp( p, "read_timeout" ) == 0 )
              opt.read_timeout = atoi( q );
          else if( strcmp( p, "max_resend" ) == 0 )
          {
              opt.max_resend = atoi( q );
              if( opt.max_resend < 0 )
                  goto usage;
          }
          else if( strcmp( p, "request_page" ) == 0 )
              opt.request_page = q;
          else if( strcmp( p, "request_size" ) == 0 )
          {
              opt.request_size = atoi( q );
              if( opt.request_size < 0 ||
                  opt.request_size > MAX_REQUEST_SIZE )
                  goto usage;
          }
          else if( strcmp( p, "ca_file" ) == 0 )
              opt.ca_file = q;
          else if( strcmp( p, "ca_path" ) == 0 )
              opt.ca_path = q;
          else if( strcmp( p, "crt_file" ) == 0 )
              opt.crt_file = q;
          else if( strcmp( p, "key_file" ) == 0 )
              opt.key_file = q;
          else if( strcmp( p, "key_pwd" ) == 0 )
              opt.key_pwd = q;
  #if defined(MBEDTLS_USE_PSA_CRYPTO) && defined(MBEDTLS_X509_CRT_PARSE_C)
          else if( strcmp( p, "key_opaque" ) == 0 )
              opt.key_opaque = atoi( q );
  #endif
  #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
          else if( strcmp( p, "cid" ) == 0 )
          {
              opt.cid_enabled = atoi( q );
              if( opt.cid_enabled != 0 && opt.cid_enabled != 1 )
                  goto usage;
          }
          else if( strcmp( p, "cid_renego" ) == 0 )
          {
              opt.cid_enabled_renego = atoi( q );
              if( opt.cid_enabled_renego != 0 && opt.cid_enabled_renego != 1 )
                  goto usage;
          }
          else if( strcmp( p, "cid_val" ) == 0 )
          {
              opt.cid_val = q;
          }
          else if( strcmp( p, "cid_val_renego" ) == 0 )
          {
              opt.cid_val_renego = q;
          }
  #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
          else if( strcmp( p, "psk" ) == 0 )
              opt.psk = q;
  #if defined(MBEDTLS_USE_PSA_CRYPTO)
          else if( strcmp( p, "psk_opaque" ) == 0 )
              opt.psk_opaque = atoi( q );
  #endif
  #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
          else if( strcmp( p, "ca_callback" ) == 0)
              opt.ca_callback = atoi( q );
  #endif
          else if( strcmp( p, "psk_identity" ) == 0 )
              opt.psk_identity = q;
          else if( strcmp( p, "ecjpake_pw" ) == 0 )
              opt.ecjpake_pw = q;
          else if( strcmp( p, "ec_max_ops" ) == 0 )
              opt.ec_max_ops = atoi( q );
          else if( strcmp( p, "force_ciphersuite" ) == 0 )
          {
              opt.force_ciphersuite[0] = mbedtls_ssl_get_ciphersuite_id( q );
  
              if( opt.force_ciphersuite[0] == 0 )
              {
                  ret = 2;
                  goto usage;
              }
              opt.force_ciphersuite[1] = 0;
          }
          else if( strcmp( p, "renegotiation" ) == 0 )
          {
              opt.renegotiation = (atoi( q )) ?
                  MBEDTLS_SSL_RENEGOTIATION_ENABLED :
                  MBEDTLS_SSL_RENEGOTIATION_DISABLED;
          }
          else if( strcmp( p, "allow_legacy" ) == 0 )
          {
              switch( atoi( q ) )
              {
                  case -1:
                      opt.allow_legacy = MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE;
                      break;
                  case 0:
                      opt.allow_legacy = MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION;
                      break;
                  case 1:
                      opt.allow_legacy = MBEDTLS_SSL_LEGACY_ALLOW_RENEGOTIATION;
                      break;
                  default: goto usage;
              }
          }
          else if( strcmp( p, "renegotiate" ) == 0 )
          {
              opt.renegotiate = atoi( q );
              if( opt.renegotiate < 0 || opt.renegotiate > 1 )
                  goto usage;
          }
          else if( strcmp( p, "exchanges" ) == 0 )
          {
              opt.exchanges = atoi( q );
              if( opt.exchanges < 1 )
                  goto usage;
          }
          else if( strcmp( p, "reconnect" ) == 0 )
          {
              opt.reconnect = atoi( q );
              if( opt.reconnect < 0 || opt.reconnect > 2 )
                  goto usage;
          }
          else if( strcmp( p, "reco_delay" ) == 0 )
          {
              opt.reco_delay = atoi( q );
              if( opt.reco_delay < 0 )
                  goto usage;
          }
          else if( strcmp( p, "reco_mode" ) == 0 )
          {
              opt.reco_mode = atoi( q );
              if( opt.reco_mode < 0 )
                  goto usage;
          }
          else if( strcmp( p, "reconnect_hard" ) == 0 )
          {
              opt.reconnect_hard = atoi( q );
              if( opt.reconnect_hard < 0 || opt.reconnect_hard > 1 )
                  goto usage;
          }
          else if( strcmp( p, "tickets" ) == 0 )
          {
              opt.tickets = atoi( q );
              if( opt.tickets < 0 || opt.tickets > 2 )
                  goto usage;
          }
          else if( strcmp( p, "alpn" ) == 0 )
          {
              opt.alpn_string = q;
          }
          else if( strcmp( p, "fallback" ) == 0 )
          {
              switch( atoi( q ) )
              {
                  case 0: opt.fallback = MBEDTLS_SSL_IS_NOT_FALLBACK; break;
                  case 1: opt.fallback = MBEDTLS_SSL_IS_FALLBACK; break;
                  default: goto usage;
              }
          }
          else if( strcmp( p, "extended_ms" ) == 0 )
          {
              switch( atoi( q ) )
              {
                  case 0:
                      opt.extended_ms = MBEDTLS_SSL_EXTENDED_MS_DISABLED;
                      break;
                  case 1:
                      opt.extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED;
                      break;
                  default: goto usage;
              }
          }
          else if( strcmp( p, "curves" ) == 0 )
              opt.curves = q;
          else if( strcmp( p, "etm" ) == 0 )
          {
              switch( atoi( q ) )
              {
                  case 0: opt.etm = MBEDTLS_SSL_ETM_DISABLED; break;
                  case 1: opt.etm = MBEDTLS_SSL_ETM_ENABLED; break;
                  default: goto usage;
              }
          }
          else if( strcmp( p, "min_version" ) == 0 )
          {
              if( strcmp( q, "ssl3" ) == 0 )
                  opt.min_version = MBEDTLS_SSL_MINOR_VERSION_0;
              else if( strcmp( q, "tls1" ) == 0 )
                  opt.min_version = MBEDTLS_SSL_MINOR_VERSION_1;
              else if( strcmp( q, "tls1_1" ) == 0 ||
                       strcmp( q, "dtls1" ) == 0 )
                  opt.min_version = MBEDTLS_SSL_MINOR_VERSION_2;
              else if( strcmp( q, "tls1_2" ) == 0 ||
                       strcmp( q, "dtls1_2" ) == 0 )
                  opt.min_version = MBEDTLS_SSL_MINOR_VERSION_3;
              else
                  goto usage;
          }
          else if( strcmp( p, "max_version" ) == 0 )
          {
              if( strcmp( q, "ssl3" ) == 0 )
                  opt.max_version = MBEDTLS_SSL_MINOR_VERSION_0;
              else if( strcmp( q, "tls1" ) == 0 )
                  opt.max_version = MBEDTLS_SSL_MINOR_VERSION_1;
              else if( strcmp( q, "tls1_1" ) == 0 ||
                       strcmp( q, "dtls1" ) == 0 )
                  opt.max_version = MBEDTLS_SSL_MINOR_VERSION_2;
              else if( strcmp( q, "tls1_2" ) == 0 ||
                       strcmp( q, "dtls1_2" ) == 0 )
                  opt.max_version = MBEDTLS_SSL_MINOR_VERSION_3;
              else
                  goto usage;
          }
          else if( strcmp( p, "arc4" ) == 0 )
          {
              switch( atoi( q ) )
              {
                  case 0:     opt.arc4 = MBEDTLS_SSL_ARC4_DISABLED;   break;
                  case 1:     opt.arc4 = MBEDTLS_SSL_ARC4_ENABLED;    break;
                  default:    goto usage;
              }
          }
          else if( strcmp( p, "allow_sha1" ) == 0 )
          {
              switch( atoi( q ) )
              {
                  case 0:     opt.allow_sha1 = 0;   break;
                  case 1:     opt.allow_sha1 = 1;    break;
                  default:    goto usage;
              }
          }
          else if( strcmp( p, "force_version" ) == 0 )
          {
              if( strcmp( q, "ssl3" ) == 0 )
              {
                  opt.min_version = MBEDTLS_SSL_MINOR_VERSION_0;
                  opt.max_version = MBEDTLS_SSL_MINOR_VERSION_0;
              }
              else if( strcmp( q, "tls1" ) == 0 )
              {
                  opt.min_version = MBEDTLS_SSL_MINOR_VERSION_1;
                  opt.max_version = MBEDTLS_SSL_MINOR_VERSION_1;
              }
              else if( strcmp( q, "tls1_1" ) == 0 )
              {
                  opt.min_version = MBEDTLS_SSL_MINOR_VERSION_2;
                  opt.max_version = MBEDTLS_SSL_MINOR_VERSION_2;
              }
              else if( strcmp( q, "tls1_2" ) == 0 )
              {
                  opt.min_version = MBEDTLS_SSL_MINOR_VERSION_3;
                  opt.max_version = MBEDTLS_SSL_MINOR_VERSION_3;
              }
              else if( strcmp( q, "dtls1" ) == 0 )
              {
                  opt.min_version = MBEDTLS_SSL_MINOR_VERSION_2;
                  opt.max_version = MBEDTLS_SSL_MINOR_VERSION_2;
                  opt.transport = MBEDTLS_SSL_TRANSPORT_DATAGRAM;
              }
              else if( strcmp( q, "dtls1_2" ) == 0 )
              {
                  opt.min_version = MBEDTLS_SSL_MINOR_VERSION_3;
                  opt.max_version = MBEDTLS_SSL_MINOR_VERSION_3;
                  opt.transport = MBEDTLS_SSL_TRANSPORT_DATAGRAM;
              }
              else
                  goto usage;
          }
          else if( strcmp( p, "auth_mode" ) == 0 )
          {
              if( strcmp( q, "none" ) == 0 )
                  opt.auth_mode = MBEDTLS_SSL_VERIFY_NONE;
              else if( strcmp( q, "optional" ) == 0 )
                  opt.auth_mode = MBEDTLS_SSL_VERIFY_OPTIONAL;
              else if( strcmp( q, "required" ) == 0 )
                  opt.auth_mode = MBEDTLS_SSL_VERIFY_REQUIRED;
              else
                  goto usage;
          }
          else if( strcmp( p, "max_frag_len" ) == 0 )
          {
              if( strcmp( q, "512" ) == 0 )
                  opt.mfl_code = MBEDTLS_SSL_MAX_FRAG_LEN_512;
              else if( strcmp( q, "1024" ) == 0 )
                  opt.mfl_code = MBEDTLS_SSL_MAX_FRAG_LEN_1024;
              else if( strcmp( q, "2048" ) == 0 )
                  opt.mfl_code = MBEDTLS_SSL_MAX_FRAG_LEN_2048;
              else if( strcmp( q, "4096" ) == 0 )
                  opt.mfl_code = MBEDTLS_SSL_MAX_FRAG_LEN_4096;
              else
                  goto usage;
          }
          else if( strcmp( p, "trunc_hmac" ) == 0 )
          {
              switch( atoi( q ) )
              {
                  case 0: opt.trunc_hmac = MBEDTLS_SSL_TRUNC_HMAC_DISABLED; break;
                  case 1: opt.trunc_hmac = MBEDTLS_SSL_TRUNC_HMAC_ENABLED; break;
                  default: goto usage;
              }
          }
          else if( strcmp( p, "hs_timeout" ) == 0 )
          {
              if( ( p = strchr( q, '-' ) ) == NULL )
                  goto usage;
              *p++ = '\0';
              opt.hs_to_min = atoi( q );
              opt.hs_to_max = atoi( p );
              if( opt.hs_to_min == 0 || opt.hs_to_max < opt.hs_to_min )
                  goto usage;
          }
          else if( strcmp( p, "mtu" ) == 0 )
          {
              opt.dtls_mtu = atoi( q );
              if( opt.dtls_mtu < 0 )
                  goto usage;
          }
          else if( strcmp( p, "dgram_packing" ) == 0 )
          {
              opt.dgram_packing = atoi( q );
              if( opt.dgram_packing != 0 &&
                  opt.dgram_packing != 1 )
              {
                  goto usage;
              }
          }
          else if( strcmp( p, "recsplit" ) == 0 )
          {
              opt.recsplit = atoi( q );
              if( opt.recsplit < 0 || opt.recsplit > 1 )
                  goto usage;
          }
          else if( strcmp( p, "dhmlen" ) == 0 )
          {
              opt.dhmlen = atoi( q );
              if( opt.dhmlen < 0 )
                  goto usage;
          }
          else if( strcmp( p, "query_config" ) == 0 )
          {
              opt.query_config_mode = 1;
              query_config_ret = query_config( q );
              goto exit;
          }
          else if( strcmp( p, "serialize") == 0 )
          {
              opt.serialize = atoi( q );
              if( opt.serialize < 0 || opt.serialize > 2)
                  goto usage;
          }
          else if( strcmp( p, "context_file") == 0 )
          {
              opt.context_file = q;
          }
          else if( strcmp( p, "eap_tls" ) == 0 )
          {
              opt.eap_tls = atoi( q );
              if( opt.eap_tls < 0 || opt.eap_tls > 1 )
                  goto usage;
          }
          else if( strcmp( p, "reproducible" ) == 0 )
          {
              opt.reproducible = 1;
          }
          else if( strcmp( p, "nss_keylog" ) == 0 )
          {
              opt.nss_keylog = atoi( q );
              if( opt.nss_keylog < 0 || opt.nss_keylog > 1 )
                  goto usage;
          }
          else if( strcmp( p, "nss_keylog_file" ) == 0 )
          {
              opt.nss_keylog_file = q;
          }
          else if( strcmp( p, "skip_close_notify" ) == 0 )
          {
              opt.skip_close_notify = atoi( q );
              if( opt.skip_close_notify < 0 || opt.skip_close_notify > 1 )
                  goto usage;
          }
          else if( strcmp( p, "use_srtp" ) == 0 )
          {
              opt.use_srtp = atoi ( q );
          }
          else if( strcmp( p, "srtp_force_profile" ) == 0 )
          {
              opt.force_srtp_profile = atoi( q );
          }
          else if( strcmp( p, "mki" ) == 0 )
          {
              opt.mki = q;
          }
          else
              goto usage;
      }
  
      if( opt.nss_keylog != 0 && opt.eap_tls != 0 )
      {
          mbedtls_printf( "Error: eap_tls and nss_keylog options cannot be used together.\n" );
          goto usage;
      }
  
      /* Event-driven IO is incompatible with the above custom
       * receive and send functions, as the polling builds on
       * refers to the underlying net_context. */
      if( opt.event == 1 && opt.nbio != 1 )
      {
          mbedtls_printf( "Warning: event-driven IO mandates nbio=1 - overwrite\n" );
          opt.nbio = 1;
      }
  
  #if defined(MBEDTLS_DEBUG_C)
      mbedtls_debug_set_threshold( opt.debug_level );
  #endif
  
  #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
      /*
       * Unhexify the pre-shared key if any is given
       */
      if( strlen( opt.psk ) )
      {
          if( mbedtls_test_unhexify( psk, sizeof( psk ),
                                     opt.psk, &psk_len ) != 0 )
          {
              mbedtls_printf( "pre-shared key not valid\n" );
              goto exit;
          }
      }
  #endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
  
  #if defined(MBEDTLS_USE_PSA_CRYPTO)
      if( opt.psk_opaque != 0 )
      {
          if( opt.psk == NULL )
          {
              mbedtls_printf( "psk_opaque set but no psk to be imported specified.\n" );
              ret = 2;
              goto usage;
          }
  
          if( opt.force_ciphersuite[0] <= 0 )
          {
              mbedtls_printf( "opaque PSKs are only supported in conjunction with forcing TLS 1.2 and a PSK-only ciphersuite through the 'force_ciphersuite' option.\n" );
              ret = 2;
              goto usage;
          }
      }
  #endif /* MBEDTLS_USE_PSA_CRYPTO */
  
      if( opt.force_ciphersuite[0] > 0 )
      {
          const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
          ciphersuite_info =
              mbedtls_ssl_ciphersuite_from_id( opt.force_ciphersuite[0] );
  
          if( opt.max_version != -1 &&
              ciphersuite_info->min_minor_ver > opt.max_version )
          {
              mbedtls_printf( "forced ciphersuite not allowed with this protocol version\n" );
              ret = 2;
              goto usage;
          }
          if( opt.min_version != -1 &&
              ciphersuite_info->max_minor_ver < opt.min_version )
          {
              mbedtls_printf( "forced ciphersuite not allowed with this protocol version\n" );
              ret = 2;
              goto usage;
          }
  
          /* If the server selects a version that's not supported by
           * this suite, then there will be no common ciphersuite... */
          if( opt.max_version == -1 ||
              opt.max_version > ciphersuite_info->max_minor_ver )
          {
              opt.max_version = ciphersuite_info->max_minor_ver;
          }
          if( opt.min_version < ciphersuite_info->min_minor_ver )
          {
              opt.min_version = ciphersuite_info->min_minor_ver;
              /* DTLS starts with TLS 1.1 */
              if( opt.transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
                  opt.min_version < MBEDTLS_SSL_MINOR_VERSION_2 )
                  opt.min_version = MBEDTLS_SSL_MINOR_VERSION_2;
          }
  
          /* Enable RC4 if needed and not explicitly disabled */
          if( ciphersuite_info->cipher == MBEDTLS_CIPHER_ARC4_128 )
          {
              if( opt.arc4 == MBEDTLS_SSL_ARC4_DISABLED )
              {
                  mbedtls_printf( "forced RC4 ciphersuite with RC4 disabled\n" );
                  ret = 2;
                  goto usage;
              }
  
              opt.arc4 = MBEDTLS_SSL_ARC4_ENABLED;
          }
  
  #if defined(MBEDTLS_USE_PSA_CRYPTO)
          if( opt.psk_opaque != 0 )
          {
              /* Ensure that the chosen ciphersuite is PSK-only; we must know
               * the ciphersuite in advance to set the correct policy for the
               * PSK key slot. This limitation might go away in the future. */
              if( ciphersuite_info->key_exchange != MBEDTLS_KEY_EXCHANGE_PSK ||
                  opt.min_version != MBEDTLS_SSL_MINOR_VERSION_3 )
              {
                  mbedtls_printf( "opaque PSKs are only supported in conjunction with forcing TLS 1.2 and a PSK-only ciphersuite through the 'force_ciphersuite' option.\n" );
                  ret = 2;
                  goto usage;
              }
  
              /* Determine KDF algorithm the opaque PSK will be used in. */
  #if defined(MBEDTLS_SHA512_C)
              if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 )
                  alg = PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_384);
              else
  #endif /* MBEDTLS_SHA512_C */
                  alg = PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_256);
          }
  #endif /* MBEDTLS_USE_PSA_CRYPTO */
      }
  
  #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
      if( mbedtls_test_unhexify( cid, sizeof( cid ),
                                 opt.cid_val, &cid_len ) != 0 )
      {
          mbedtls_printf( "CID not valid\n" );
          goto exit;
      }
  
      /* Keep CID settings for renegotiation unless
       * specified otherwise. */
      if( opt.cid_enabled_renego == DFL_CID_ENABLED_RENEGO )
          opt.cid_enabled_renego = opt.cid_enabled;
      if( opt.cid_val_renego == DFL_CID_VALUE_RENEGO )
          opt.cid_val_renego = opt.cid_val;
  
      if( mbedtls_test_unhexify( cid_renego, sizeof( cid_renego ),
                                 opt.cid_val_renego, &cid_renego_len ) != 0 )
      {
          mbedtls_printf( "CID not valid\n" );
          goto exit;
      }
  #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
  
  #if defined(MBEDTLS_ECP_C)
      if( opt.curves != NULL )
      {
          p = (char *) opt.curves;
          i = 0;
  
          if( strcmp( p, "none" ) == 0 )
          {
              curve_list[0] = MBEDTLS_ECP_DP_NONE;
          }
          else if( strcmp( p, "default" ) != 0 )
          {
              /* Leave room for a final NULL in curve list */
              while( i < CURVE_LIST_SIZE - 1 && *p != '\0' )
              {
                  q = p;
  
                  /* Terminate the current string */
                  while( *p != ',' && *p != '\0' )
                      p++;
                  if( *p == ',' )
                      *p++ = '\0';
  
                  if( ( curve_cur = mbedtls_ecp_curve_info_from_name( q ) ) != NULL )
                  {
                      curve_list[i++] = curve_cur->grp_id;
                  }
                  else
                  {
                      mbedtls_printf( "unknown curve %s\n", q );
                      mbedtls_printf( "supported curves: " );
                      for( curve_cur = mbedtls_ecp_curve_list();
                           curve_cur->grp_id != MBEDTLS_ECP_DP_NONE;
                           curve_cur++ )
                      {
                          mbedtls_printf( "%s ", curve_cur->name );
                      }
                      mbedtls_printf( "\n" );
                      goto exit;
                  }
              }
  
              mbedtls_printf("Number of curves: %d\n", i );
  
              if( i == CURVE_LIST_SIZE - 1 && *p != '\0' )
              {
                  mbedtls_printf( "curves list too long, maximum %d",
                                  CURVE_LIST_SIZE - 1 );
                  goto exit;
              }
  
              curve_list[i] = MBEDTLS_ECP_DP_NONE;
          }
      }
  #endif /* MBEDTLS_ECP_C */
  
  #if defined(MBEDTLS_SSL_ALPN)
      if( opt.alpn_string != NULL )
      {
          p = (char *) opt.alpn_string;
          i = 0;
  
          /* Leave room for a final NULL in alpn_list */
          while( i < ALPN_LIST_SIZE - 1 && *p != '\0' )
          {
              alpn_list[i++] = p;
  
              /* Terminate the current string and move on to next one */
              while( *p != ',' && *p != '\0' )
                  p++;
              if( *p == ',' )
                  *p++ = '\0';
          }
      }
  #endif /* MBEDTLS_SSL_ALPN */
  
      /*
       * 0. Initialize the RNG and the session data
       */
      mbedtls_printf( "\n  . Seeding the random number generator..." );
      fflush( stdout );
  
      mbedtls_entropy_init( &entropy );
      if (opt.reproducible)
      {
          srand( 1 );
          if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, dummy_entropy,
                                             &entropy, (const unsigned char *) pers,
                                             strlen( pers ) ) ) != 0 )
          {
              mbedtls_printf( " failed\n  ! mbedtls_ctr_drbg_seed returned -0x%x\n",
                              (unsigned int) -ret );
              goto exit;
          }
      }
      else
      {
          if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func,
                                             &entropy, (const unsigned char *) pers,
                                             strlen( pers ) ) ) != 0 )
          {
              mbedtls_printf( " failed\n  ! mbedtls_ctr_drbg_seed returned -0x%x\n",
                              (unsigned int) -ret );
              goto exit;
          }
      }
  
      mbedtls_printf( " ok\n" );
  
  #if defined(MBEDTLS_X509_CRT_PARSE_C)
      /*
       * 1.1. Load the trusted CA
       */
      mbedtls_printf( "  . Loading the CA root certificate ..." );
      fflush( stdout );
  
      if( strcmp( opt.ca_path, "none" ) == 0 ||
          strcmp( opt.ca_file, "none" ) == 0 )
      {
          ret = 0;
      }
      else
  #if defined(MBEDTLS_FS_IO)
      if( strlen( opt.ca_path ) )
          ret = mbedtls_x509_crt_parse_path( &cacert, opt.ca_path );
      else if( strlen( opt.ca_file ) )
          ret = mbedtls_x509_crt_parse_file( &cacert, opt.ca_file );
      else
  #endif
  #if defined(MBEDTLS_CERTS_C)
      {
  #if defined(MBEDTLS_PEM_PARSE_C)
          for( i = 0; mbedtls_test_cas[i] != NULL; i++ )
          {
              ret = mbedtls_x509_crt_parse( &cacert,
                                    (const unsigned char *) mbedtls_test_cas[i],
                                    mbedtls_test_cas_len[i] );
              if( ret != 0 )
                  break;
          }
          if( ret == 0 )
  #endif /* MBEDTLS_PEM_PARSE_C */
          for( i = 0; mbedtls_test_cas_der[i] != NULL; i++ )
          {
              ret = mbedtls_x509_crt_parse_der( &cacert,
                           (const unsigned char *) mbedtls_test_cas_der[i],
                           mbedtls_test_cas_der_len[i] );
              if( ret != 0 )
                  break;
          }
      }
  #else
      {
          ret = 1;
          mbedtls_printf( "MBEDTLS_CERTS_C not defined." );
      }
  #endif /* MBEDTLS_CERTS_C */
      if( ret < 0 )
      {
          mbedtls_printf( " failed\n  !  mbedtls_x509_crt_parse returned -0x%x\n\n",
                          (unsigned int) -ret );
          goto exit;
      }
  
      mbedtls_printf( " ok (%d skipped)\n", ret );
  
      /*
       * 1.2. Load own certificate and private key
       *
       * (can be skipped if client authentication is not required)
       */
      mbedtls_printf( "  . Loading the client cert. and key..." );
      fflush( stdout );
  
      if( strcmp( opt.crt_file, "none" ) == 0 )
          ret = 0;
      else
  #if defined(MBEDTLS_FS_IO)
      if( strlen( opt.crt_file ) )
          ret = mbedtls_x509_crt_parse_file( &clicert, opt.crt_file );
      else
  #endif
  #if defined(MBEDTLS_CERTS_C)
          ret = mbedtls_x509_crt_parse( &clicert,
                  (const unsigned char *) mbedtls_test_cli_crt,
                  mbedtls_test_cli_crt_len );
  #else
      {
          ret = 1;
          mbedtls_printf( "MBEDTLS_CERTS_C not defined." );
      }
  #endif
      if( ret != 0 )
      {
          mbedtls_printf( " failed\n  !  mbedtls_x509_crt_parse returned -0x%x\n\n",
                          (unsigned int) -ret );
          goto exit;
      }
  
      if( strcmp( opt.key_file, "none" ) == 0 )
          ret = 0;
      else
  #if defined(MBEDTLS_FS_IO)
      if( strlen( opt.key_file ) )
          ret = mbedtls_pk_parse_keyfile( &pkey, opt.key_file, opt.key_pwd );
      else
  #endif
  #if defined(MBEDTLS_CERTS_C)
          ret = mbedtls_pk_parse_key( &pkey,
                  (const unsigned char *) mbedtls_test_cli_key,
                  mbedtls_test_cli_key_len, NULL, 0 );
  #else
      {
          ret = 1;
          mbedtls_printf( "MBEDTLS_CERTS_C not defined." );
      }
  #endif
      if( ret != 0 )
      {
          mbedtls_printf( " failed\n  !  mbedtls_pk_parse_key returned -0x%x\n\n",
                          (unsigned int) -ret );
          goto exit;
      }
  
  #if defined(MBEDTLS_USE_PSA_CRYPTO)
      if( opt.key_opaque != 0 )
      {
          if( ( ret = mbedtls_pk_wrap_as_opaque( &pkey, &key_slot,
                                                 PSA_ALG_SHA_256 ) ) != 0 )
          {
              mbedtls_printf( " failed\n  !  "
                              "mbedtls_pk_wrap_as_opaque returned -0x%x\n\n", -ret );
              goto exit;
          }
      }
  #endif /* MBEDTLS_USE_PSA_CRYPTO */
  
      mbedtls_printf( " ok (key type: %s)\n", mbedtls_pk_get_name( &pkey ) );
  #endif /* MBEDTLS_X509_CRT_PARSE_C */
  
      /*
       * 2. Start the connection
       */
      if( opt.server_addr == NULL)
          opt.server_addr = opt.server_name;
  
      mbedtls_printf( "  . Connecting to %s/%s/%s...",
              opt.transport == MBEDTLS_SSL_TRANSPORT_STREAM ? "tcp" : "udp",
              opt.server_addr, opt.server_port );
      fflush( stdout );
  
      if( ( ret = mbedtls_net_connect( &server_fd,
                         opt.server_addr, opt.server_port,
                         opt.transport == MBEDTLS_SSL_TRANSPORT_STREAM ?
                         MBEDTLS_NET_PROTO_TCP : MBEDTLS_NET_PROTO_UDP ) ) != 0 )
      {
          mbedtls_printf( " failed\n  ! mbedtls_net_connect returned -0x%x\n\n",
                          (unsigned int) -ret );
          goto exit;
      }
  
      if( opt.nbio > 0 )
          ret = mbedtls_net_set_nonblock( &server_fd );
      else
          ret = mbedtls_net_set_block( &server_fd );
      if( ret != 0 )
      {
          mbedtls_printf( " failed\n  ! net_set_(non)block() returned -0x%x\n\n",
                          (unsigned int) -ret );
          goto exit;
      }
  
      mbedtls_printf( " ok\n" );
  
      /*
       * 3. Setup stuff
       */
      mbedtls_printf( "  . Setting up the SSL/TLS structure..." );
      fflush( stdout );
  
      if( ( ret = mbedtls_ssl_config_defaults( &conf,
                      MBEDTLS_SSL_IS_CLIENT,
                      opt.transport,
                      MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
      {
          mbedtls_printf( " failed\n  ! mbedtls_ssl_config_defaults returned -0x%x\n\n",
                          (unsigned int) -ret );
          goto exit;
      }
  
  #if defined(MBEDTLS_X509_CRT_PARSE_C)
      /* The default algorithms profile disables SHA-1, but our tests still
         rely on it heavily. */
      if( opt.allow_sha1 > 0 )
      {
          crt_profile_for_test.allowed_mds |= MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA1 );
          mbedtls_ssl_conf_cert_profile( &conf, &crt_profile_for_test );
          mbedtls_ssl_conf_sig_hashes( &conf, ssl_sig_hashes_for_test );
      }
  
      if( opt.context_crt_cb == 0 )
          mbedtls_ssl_conf_verify( &conf, my_verify, NULL );
  
      memset( peer_crt_info, 0, sizeof( peer_crt_info ) );
  #endif /* MBEDTLS_X509_CRT_PARSE_C */
  
  #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
      if( opt.cid_enabled == 1 || opt.cid_enabled_renego == 1 )
      {
          if( opt.cid_enabled == 1        &&
              opt.cid_enabled_renego == 1 &&
              cid_len != cid_renego_len )
          {
              mbedtls_printf( "CID length must not change during renegotiation\n" );
              goto usage;
          }
  
          if( opt.cid_enabled == 1 )
              ret = mbedtls_ssl_conf_cid( &conf, cid_len,
                                          MBEDTLS_SSL_UNEXPECTED_CID_IGNORE );
          else
              ret = mbedtls_ssl_conf_cid( &conf, cid_renego_len,
                                          MBEDTLS_SSL_UNEXPECTED_CID_IGNORE );
  
          if( ret != 0 )
          {
              mbedtls_printf( " failed\n  ! mbedtls_ssl_conf_cid_len returned -%#04x\n\n",
                              (unsigned int) -ret );
              goto exit;
          }
      }
  #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
  
      if( opt.auth_mode != DFL_AUTH_MODE )
          mbedtls_ssl_conf_authmode( &conf, opt.auth_mode );
  
  #if defined(MBEDTLS_SSL_PROTO_DTLS)
      if( opt.hs_to_min != DFL_HS_TO_MIN || opt.hs_to_max != DFL_HS_TO_MAX )
          mbedtls_ssl_conf_handshake_timeout( &conf, opt.hs_to_min,
                                              opt.hs_to_max );
  
      if( opt.dgram_packing != DFL_DGRAM_PACKING )
          mbedtls_ssl_set_datagram_packing( &ssl, opt.dgram_packing );
  #endif /* MBEDTLS_SSL_PROTO_DTLS */
  
  #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
      if( ( ret = mbedtls_ssl_conf_max_frag_len( &conf, opt.mfl_code ) ) != 0 )
      {
          mbedtls_printf( " failed\n  ! mbedtls_ssl_conf_max_frag_len returned %d\n\n",
                          ret );
          goto exit;
      }
  #endif
  
  #if defined(MBEDTLS_SSL_DTLS_SRTP)
      const mbedtls_ssl_srtp_profile forced_profile[] =
                                  { opt.force_srtp_profile, MBEDTLS_TLS_SRTP_UNSET };
      if( opt.use_srtp == 1 )
      {
          if( opt.force_srtp_profile != 0 )
          {
              ret = mbedtls_ssl_conf_dtls_srtp_protection_profiles ( &conf, forced_profile );
          }
          else
          {
              ret = mbedtls_ssl_conf_dtls_srtp_protection_profiles ( &conf, default_profiles );
          }
  
          if( ret != 0 )
          {
              mbedtls_printf( " failed\n  ! "
                              "mbedtls_ssl_conf_dtls_srtp_protection_profiles returned %d\n\n",
                              ret );
              goto exit;
          }
  
      }
      else if( opt.force_srtp_profile != 0 )
      {
          mbedtls_printf( " failed\n  ! must enable use_srtp to force srtp profile\n\n" );
          goto exit;
      }
  #endif /* MBEDTLS_SSL_DTLS_SRTP */
  
  #if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
      if( opt.trunc_hmac != DFL_TRUNC_HMAC )
          mbedtls_ssl_conf_truncated_hmac( &conf, opt.trunc_hmac );
  #endif
  
  #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
      if( opt.extended_ms != DFL_EXTENDED_MS )
          mbedtls_ssl_conf_extended_master_secret( &conf, opt.extended_ms );
  #endif
  
  #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
      if( opt.etm != DFL_ETM )
          mbedtls_ssl_conf_encrypt_then_mac( &conf, opt.etm );
  #endif
  
  #if defined(MBEDTLS_SSL_EXPORT_KEYS)
      if( opt.eap_tls != 0 )
      {
          mbedtls_ssl_conf_export_keys_ext_cb( &conf, eap_tls_key_derivation,
                                               &eap_tls_keying );
      }
      else if( opt.nss_keylog != 0 )
      {
          mbedtls_ssl_conf_export_keys_ext_cb( &conf,
                                               nss_keylog_export,
                                               NULL );
      }
  #if defined( MBEDTLS_SSL_DTLS_SRTP )
      else if( opt.use_srtp != 0 )
      {
          mbedtls_ssl_conf_export_keys_ext_cb( &conf, dtls_srtp_key_derivation,
                                               &dtls_srtp_keying );
      }
  #endif /* MBEDTLS_SSL_DTLS_SRTP */
  #endif /* MBEDTLS_SSL_EXPORT_KEYS */
  
  #if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
      if( opt.recsplit != DFL_RECSPLIT )
          mbedtls_ssl_conf_cbc_record_splitting( &conf, opt.recsplit
                                    ? MBEDTLS_SSL_CBC_RECORD_SPLITTING_ENABLED
                                    : MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED );
  #endif
  
  #if defined(MBEDTLS_DHM_C)
      if( opt.dhmlen != DFL_DHMLEN )
          mbedtls_ssl_conf_dhm_min_bitlen( &conf, opt.dhmlen );
  #endif
  
  #if defined(MBEDTLS_SSL_ALPN)
      if( opt.alpn_string != NULL )
          if( ( ret = mbedtls_ssl_conf_alpn_protocols( &conf, alpn_list ) ) != 0 )
          {
              mbedtls_printf( " failed\n  ! mbedtls_ssl_conf_alpn_protocols returned %d\n\n",
                              ret );
              goto exit;
          }
  #endif
  
      if (opt.reproducible)
      {
  #if defined(MBEDTLS_HAVE_TIME)
  #if defined(MBEDTLS_PLATFORM_TIME_ALT)
          mbedtls_platform_set_time( dummy_constant_time );
  #else
          fprintf( stderr, "Warning: reproducible option used without constant time\n" );
  #endif
  #endif
      }
      mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
      mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
  
      mbedtls_ssl_conf_read_timeout( &conf, opt.read_timeout );
  
  #if defined(MBEDTLS_SSL_SESSION_TICKETS)
      mbedtls_ssl_conf_session_tickets( &conf, opt.tickets );
  #endif
  
      if( opt.force_ciphersuite[0] != DFL_FORCE_CIPHER )
          mbedtls_ssl_conf_ciphersuites( &conf, opt.force_ciphersuite );
  
  #if defined(MBEDTLS_ARC4_C)
      if( opt.arc4 != DFL_ARC4 )
          mbedtls_ssl_conf_arc4_support( &conf, opt.arc4 );
  #endif
  
      if( opt.allow_legacy != DFL_ALLOW_LEGACY )
          mbedtls_ssl_conf_legacy_renegotiation( &conf, opt.allow_legacy );
  #if defined(MBEDTLS_SSL_RENEGOTIATION)
      mbedtls_ssl_conf_renegotiation( &conf, opt.renegotiation );
  #endif
  
  #if defined(MBEDTLS_X509_CRT_PARSE_C)
      if( strcmp( opt.ca_path, "none" ) != 0 &&
          strcmp( opt.ca_file, "none" ) != 0 )
      {
  #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
          if( opt.ca_callback != 0 )
              mbedtls_ssl_conf_ca_cb( &conf, ca_callback, &cacert );
          else
  #endif
              mbedtls_ssl_conf_ca_chain( &conf, &cacert, NULL );
      }
      if( strcmp( opt.crt_file, "none" ) != 0 &&
          strcmp( opt.key_file, "none" ) != 0 )
      {
          if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &clicert, &pkey ) ) != 0 )
          {
              mbedtls_printf( " failed\n  ! mbedtls_ssl_conf_own_cert returned %d\n\n",
                              ret );
              goto exit;
          }
      }
  #endif
  
  #if defined(MBEDTLS_ECP_C)
      if( opt.curves != NULL &&
          strcmp( opt.curves, "default" ) != 0 )
      {
          mbedtls_ssl_conf_curves( &conf, curve_list );
      }
  #endif
  
  #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
  #if defined(MBEDTLS_USE_PSA_CRYPTO)
      if( opt.psk_opaque != 0 )
      {
          key_attributes = psa_key_attributes_init();
          psa_set_key_usage_flags( &key_attributes, PSA_KEY_USAGE_DERIVE );
          psa_set_key_algorithm( &key_attributes, alg );
          psa_set_key_type( &key_attributes, PSA_KEY_TYPE_DERIVE );
  
          status = psa_import_key( &key_attributes, psk, psk_len, &slot );
          if( status != PSA_SUCCESS )
          {
              ret = MBEDTLS_ERR_SSL_HW_ACCEL_FAILED;
              goto exit;
          }
  
          if( ( ret = mbedtls_ssl_conf_psk_opaque( &conf, slot,
                                    (const unsigned char *) opt.psk_identity,
                                    strlen( opt.psk_identity ) ) ) != 0 )
          {
              mbedtls_printf( " failed\n  ! mbedtls_ssl_conf_psk_opaque returned %d\n\n",
                              ret );
              goto exit;
          }
      }
      else
  #endif /* MBEDTLS_USE_PSA_CRYPTO */
      if( psk_len > 0 )
      {
          ret = mbedtls_ssl_conf_psk( &conf, psk, psk_len,
                               (const unsigned char *) opt.psk_identity,
                               strlen( opt.psk_identity ) );
          if( ret != 0 )
          {
              mbedtls_printf( " failed\n  ! mbedtls_ssl_conf_psk returned %d\n\n", ret );
              goto exit;
          }
      }
  #endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
  
      if( opt.min_version != DFL_MIN_VERSION )
          mbedtls_ssl_conf_min_version( &conf, MBEDTLS_SSL_MAJOR_VERSION_3,
                                        opt.min_version );
  
      if( opt.max_version != DFL_MAX_VERSION )
          mbedtls_ssl_conf_max_version( &conf, MBEDTLS_SSL_MAJOR_VERSION_3,
                                        opt.max_version );
  
  #if defined(MBEDTLS_SSL_FALLBACK_SCSV)
      if( opt.fallback != DFL_FALLBACK )
          mbedtls_ssl_conf_fallback( &conf, opt.fallback );
  #endif
  
      if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
      {
          mbedtls_printf( " failed\n  ! mbedtls_ssl_setup returned -0x%x\n\n",
                          (unsigned int) -ret );
          goto exit;
      }
  
  #if defined(MBEDTLS_X509_CRT_PARSE_C)
      if( ( ret = mbedtls_ssl_set_hostname( &ssl, opt.server_name ) ) != 0 )
      {
          mbedtls_printf( " failed\n  ! mbedtls_ssl_set_hostname returned %d\n\n",
                          ret );
          goto exit;
      }
  #endif
  
  #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
      if( opt.ecjpake_pw != DFL_ECJPAKE_PW )
      {
          if( ( ret = mbedtls_ssl_set_hs_ecjpake_password( &ssl,
                          (const unsigned char *) opt.ecjpake_pw,
                                          strlen( opt.ecjpake_pw ) ) ) != 0 )
          {
              mbedtls_printf( " failed\n  ! mbedtls_ssl_set_hs_ecjpake_password returned %d\n\n",
                              ret );
              goto exit;
          }
      }
  #endif
  
  #if defined(MBEDTLS_X509_CRT_PARSE_C)
      if( opt.context_crt_cb == 1 )
          mbedtls_ssl_set_verify( &ssl, my_verify, NULL );
  #endif /* MBEDTLS_X509_CRT_PARSE_C */
  
      io_ctx.ssl = &ssl;
      io_ctx.net = &server_fd;
      mbedtls_ssl_set_bio( &ssl, &io_ctx, send_cb, recv_cb,
                           opt.nbio == 0 ? recv_timeout_cb : NULL );
  
  #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
      if( opt.transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
      {
          if( ( ret = mbedtls_ssl_set_cid( &ssl, opt.cid_enabled,
                                           cid, cid_len ) ) != 0 )
          {
              mbedtls_printf( " failed\n  ! mbedtls_ssl_set_cid returned %d\n\n",
                              ret );
              goto exit;
          }
      }
  #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
  
  #if defined(MBEDTLS_SSL_PROTO_DTLS)
      if( opt.dtls_mtu != DFL_DTLS_MTU )
          mbedtls_ssl_set_mtu( &ssl, opt.dtls_mtu );
  #endif
  
  #if defined(MBEDTLS_TIMING_C)
      mbedtls_ssl_set_timer_cb( &ssl, &timer, mbedtls_timing_set_delay,
                                              mbedtls_timing_get_delay );
  #endif
  
  #if defined(MBEDTLS_ECP_RESTARTABLE)
      if( opt.ec_max_ops != DFL_EC_MAX_OPS )
          mbedtls_ecp_set_max_ops( opt.ec_max_ops );
  #endif
  
  #if defined(MBEDTLS_SSL_DTLS_SRTP)
      if( opt.use_srtp != 0 && strlen( opt.mki ) != 0 )
      {
          if( mbedtls_test_unhexify( mki, sizeof( mki ),
                                     opt.mki,&mki_len ) != 0 )
          {
              mbedtls_printf( "mki value not valid hex\n" );
              goto exit;
          }
  
          mbedtls_ssl_conf_srtp_mki_value_supported( &conf, MBEDTLS_SSL_DTLS_SRTP_MKI_SUPPORTED );
          if( ( ret = mbedtls_ssl_dtls_srtp_set_mki_value( &ssl, mki,
                                                           (uint16_t) strlen( opt.mki ) / 2 ) ) != 0 )
          {
              mbedtls_printf( " failed\n  ! mbedtls_ssl_dtls_srtp_set_mki_value returned %d\n\n", ret );
              goto exit;
          }
      }
  #endif
  
      mbedtls_printf( " ok\n" );
  
      /*
       * 4. Handshake
       */
      mbedtls_printf( "  . Performing the SSL/TLS handshake..." );
      fflush( stdout );
  
      while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
      {
          if( ret != MBEDTLS_ERR_SSL_WANT_READ &&
              ret != MBEDTLS_ERR_SSL_WANT_WRITE &&
              ret != MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS )
          {
              mbedtls_printf( " failed\n  ! mbedtls_ssl_handshake returned -0x%x\n",
                              (unsigned int) -ret );
              if( ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED )
                  mbedtls_printf(
                      "    Unable to verify the server's certificate. "
                          "Either it is invalid,\n"
                      "    or you didn't set ca_file or ca_path "
                          "to an appropriate value.\n"
                      "    Alternatively, you may want to use "
                          "auth_mode=optional for testing purposes.\n" );
              mbedtls_printf( "\n" );
              goto exit;
          }
  
  #if defined(MBEDTLS_ECP_RESTARTABLE)
          if( ret == MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS )
              continue;
  #endif
  
          /* For event-driven IO, wait for socket to become available */
          if( opt.event == 1 /* level triggered IO */ )
          {
  #if defined(MBEDTLS_TIMING_C)
              ret = idle( &server_fd, &timer, ret );
  #else
              ret = idle( &server_fd, ret );
  #endif
              if( ret != 0 )
                  goto exit;
          }
      }
  
      mbedtls_printf( " ok\n    [ Protocol is %s ]\n    [ Ciphersuite is %s ]\n",
                      mbedtls_ssl_get_version( &ssl ),
                      mbedtls_ssl_get_ciphersuite( &ssl ) );
  
      if( ( ret = mbedtls_ssl_get_record_expansion( &ssl ) ) >= 0 )
          mbedtls_printf( "    [ Record expansion is %d ]\n", ret );
      else
          mbedtls_printf( "    [ Record expansion is unknown (compression) ]\n" );
  
  #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
      mbedtls_printf( "    [ Maximum input fragment length is %u ]\n",
                      (unsigned int) mbedtls_ssl_get_input_max_frag_len( &ssl ) );
      mbedtls_printf( "    [ Maximum output fragment length is %u ]\n",
                      (unsigned int) mbedtls_ssl_get_output_max_frag_len( &ssl ) );
  #endif
  
  #if defined(MBEDTLS_SSL_ALPN)
      if( opt.alpn_string != NULL )
      {
          const char *alp = mbedtls_ssl_get_alpn_protocol( &ssl );
          mbedtls_printf( "    [ Application Layer Protocol is %s ]\n",
                  alp ? alp : "(none)" );
      }
  #endif
  
  #if defined(MBEDTLS_SSL_EXPORT_KEYS)
      if( opt.eap_tls != 0  )
      {
          size_t j = 0;
  
          if( ( ret = mbedtls_ssl_tls_prf( eap_tls_keying.tls_prf_type,
                                           eap_tls_keying.master_secret,
                                           sizeof( eap_tls_keying.master_secret ),
                                           eap_tls_label,
                                           eap_tls_keying.randbytes,
                                           sizeof( eap_tls_keying.randbytes ),
                                           eap_tls_keymaterial,
                                           sizeof( eap_tls_keymaterial ) ) )
                                           != 0 )
          {
              mbedtls_printf( " failed\n  ! mbedtls_ssl_tls_prf returned -0x%x\n\n",
                              (unsigned int) -ret );
              goto exit;
          }
  
          mbedtls_printf( "    EAP-TLS key material is:" );
          for( j = 0; j < sizeof( eap_tls_keymaterial ); j++ )
          {
              if( j % 8 == 0 )
                  mbedtls_printf("\n    ");
              mbedtls_printf("%02x ", eap_tls_keymaterial[j] );
          }
          mbedtls_printf("\n");
  
          if( ( ret = mbedtls_ssl_tls_prf( eap_tls_keying.tls_prf_type, NULL, 0,
                                           eap_tls_label,
                                           eap_tls_keying.randbytes,
                                           sizeof( eap_tls_keying.randbytes ),
                                           eap_tls_iv,
                                           sizeof( eap_tls_iv ) ) ) != 0 )
           {
               mbedtls_printf( " failed\n  ! mbedtls_ssl_tls_prf returned -0x%x\n\n",
                               (unsigned int) -ret );
               goto exit;
           }
  
          mbedtls_printf( "    EAP-TLS IV is:" );
          for( j = 0; j < sizeof( eap_tls_iv ); j++ )
          {
              if( j % 8 == 0 )
                  mbedtls_printf("\n    ");
              mbedtls_printf("%02x ", eap_tls_iv[j] );
          }
          mbedtls_printf("\n");
      }
  
  #if defined( MBEDTLS_SSL_DTLS_SRTP )
      else if( opt.use_srtp != 0  )
      {
          size_t j = 0;
          mbedtls_dtls_srtp_info dtls_srtp_negotiation_result;
          mbedtls_ssl_get_dtls_srtp_negotiation_result( &ssl, &dtls_srtp_negotiation_result );
  
          if( dtls_srtp_negotiation_result.chosen_dtls_srtp_profile
                                  == MBEDTLS_TLS_SRTP_UNSET )
          {
              mbedtls_printf( "    Unable to negotiate "
                              "the use of DTLS-SRTP\n" );
          }
          else
          {
              if( ( ret = mbedtls_ssl_tls_prf( dtls_srtp_keying.tls_prf_type,
                                               dtls_srtp_keying.master_secret,
                                               sizeof( dtls_srtp_keying.master_secret ),
                                               dtls_srtp_label,
                                               dtls_srtp_keying.randbytes,
                                               sizeof( dtls_srtp_keying.randbytes ),
                                               dtls_srtp_key_material,
                                               sizeof( dtls_srtp_key_material ) ) )
                                               != 0 )
              {
                  mbedtls_printf( " failed\n  ! mbedtls_ssl_tls_prf returned -0x%x\n\n",
                                  (unsigned int) -ret );
                  goto exit;
              }
  
              mbedtls_printf( "    DTLS-SRTP key material is:" );
              for( j = 0; j < sizeof( dtls_srtp_key_material ); j++ )
              {
                  if( j % 8 == 0 )
                      mbedtls_printf( "\n    " );
                  mbedtls_printf( "%02x ", dtls_srtp_key_material[j] );
              }
              mbedtls_printf( "\n" );
  
              /* produce a less readable output used to perform automatic checks
               * - compare client and server output
               * - interop test with openssl which client produces this kind of output
               */
              mbedtls_printf( "    Keying material: " );
              for( j = 0; j < sizeof( dtls_srtp_key_material ); j++ )
              {
                  mbedtls_printf( "%02X", dtls_srtp_key_material[j] );
              }
              mbedtls_printf( "\n" );
  
              if ( dtls_srtp_negotiation_result.mki_len > 0 )
              {
                  mbedtls_printf( "    DTLS-SRTP mki value: " );
                  for( j = 0; j < dtls_srtp_negotiation_result.mki_len; j++ )
                  {
                      mbedtls_printf( "%02X", dtls_srtp_negotiation_result.mki_value[j] );
                  }
              }
              else
              {
                  mbedtls_printf( "    DTLS-SRTP no mki value negotiated" );
              }
              mbedtls_printf( "\n" );
          }
      }
  #endif /* MBEDTLS_SSL_DTLS_SRTP */
  #endif /* MBEDTLS_SSL_EXPORT_KEYS */
      if( opt.reconnect != 0 )
      {
          mbedtls_printf("  . Saving session for reuse..." );
          fflush( stdout );
  
          if( opt.reco_mode == 1 )
          {
              /* free any previously saved data */
              if( session_data != NULL )
              {
                  mbedtls_platform_zeroize( session_data, session_data_len );
                  mbedtls_free( session_data );
                  session_data = NULL;
              }
  
              /* get size of the buffer needed */
              mbedtls_ssl_session_save( mbedtls_ssl_get_session_pointer( &ssl ),
                                        NULL, 0, &session_data_len );
              session_data = mbedtls_calloc( 1, session_data_len );
              if( session_data == NULL )
              {
                  mbedtls_printf( " failed\n  ! alloc %u bytes for session data\n",
                                  (unsigned) session_data_len );
                  ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
                  goto exit;
              }
  
              /* actually save session data */
              if( ( ret = mbedtls_ssl_session_save( mbedtls_ssl_get_session_pointer( &ssl ),
                                                    session_data, session_data_len,
                                                    &session_data_len ) ) != 0 )
              {
                  mbedtls_printf( " failed\n  ! mbedtls_ssl_session_saved returned -0x%04x\n\n",
                                  (unsigned int) -ret );
                  goto exit;
              }
          }
          else
          {
              if( ( ret = mbedtls_ssl_get_session( &ssl, &saved_session ) ) != 0 )
              {
                  mbedtls_printf( " failed\n  ! mbedtls_ssl_get_session returned -0x%x\n\n",
                                  (unsigned int) -ret );
                  goto exit;
              }
          }
  
          mbedtls_printf( " ok\n" );
  
          if( opt.reco_mode == 1 )
          {
              mbedtls_printf( "    [ Saved %u bytes of session data]\n",
                              (unsigned) session_data_len );
          }
      }
  
  #if defined(MBEDTLS_X509_CRT_PARSE_C)
      /*
       * 5. Verify the server certificate
       */
      mbedtls_printf( "  . Verifying peer X.509 certificate..." );
  
      if( ( flags = mbedtls_ssl_get_verify_result( &ssl ) ) != 0 )
      {
          char vrfy_buf[512];
  
          mbedtls_printf( " failed\n" );
  
          mbedtls_x509_crt_verify_info( vrfy_buf, sizeof( vrfy_buf ),
                                        "  ! ", flags );
  
          mbedtls_printf( "%s\n", vrfy_buf );
      }
      else
          mbedtls_printf( " ok\n" );
  
      mbedtls_printf( "  . Peer certificate information    ...\n" );
      mbedtls_printf( "%s\n", peer_crt_info );
  #endif /* MBEDTLS_X509_CRT_PARSE_C */
  
  #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
      ret = report_cid_usage( &ssl, "initial handshake" );
      if( ret != 0 )
          goto exit;
  
      if( opt.transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
      {
          if( ( ret = mbedtls_ssl_set_cid( &ssl, opt.cid_enabled_renego,
                                           cid_renego,
                                           cid_renego_len ) ) != 0 )
          {
              mbedtls_printf( " failed\n  ! mbedtls_ssl_set_cid returned %d\n\n",
                              ret );
              goto exit;
          }
      }
  #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
  
  #if defined(MBEDTLS_SSL_RENEGOTIATION)
      if( opt.renegotiate )
      {
          /*
           * Perform renegotiation (this must be done when the server is waiting
           * for input from our side).
           */
          mbedtls_printf( "  . Performing renegotiation..." );
          fflush( stdout );
          while( ( ret = mbedtls_ssl_renegotiate( &ssl ) ) != 0 )
          {
              if( ret != MBEDTLS_ERR_SSL_WANT_READ &&
                  ret != MBEDTLS_ERR_SSL_WANT_WRITE &&
                  ret != MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS )
              {
                  mbedtls_printf( " failed\n  ! mbedtls_ssl_renegotiate returned %d\n\n",
                                  ret );
                  goto exit;
              }
  
  #if defined(MBEDTLS_ECP_RESTARTABLE)
              if( ret == MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS )
                  continue;
  #endif
  
              /* For event-driven IO, wait for socket to become available */
              if( opt.event == 1 /* level triggered IO */ )
              {
  #if defined(MBEDTLS_TIMING_C)
                  idle( &server_fd, &timer, ret );
  #else
                  idle( &server_fd, ret );
  #endif
              }
  
          }
          mbedtls_printf( " ok\n" );
      }
  #endif /* MBEDTLS_SSL_RENEGOTIATION */
  
  #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
      ret = report_cid_usage( &ssl, "after renegotiation" );
      if( ret != 0 )
          goto exit;
  #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
  
      /*
       * 6. Write the GET request
       */
      retry_left = opt.max_resend;
  send_request:
      mbedtls_printf( "  > Write to server:" );
      fflush( stdout );
  
      len = mbedtls_snprintf( (char *) buf, sizeof( buf ) - 1, GET_REQUEST,
                              opt.request_page );
      tail_len = (int) strlen( GET_REQUEST_END );
  
      /* Add padding to GET request to reach opt.request_size in length */
      if( opt.request_size != DFL_REQUEST_SIZE &&
          len + tail_len < opt.request_size )
      {
          memset( buf + len, 'A', opt.request_size - len - tail_len );
          len += opt.request_size - len - tail_len;
      }
  
      strncpy( (char *) buf + len, GET_REQUEST_END, sizeof( buf ) - len - 1 );
      len += tail_len;
  
      /* Truncate if request size is smaller than the "natural" size */
      if( opt.request_size != DFL_REQUEST_SIZE &&
          len > opt.request_size )
      {
          len = opt.request_size;
  
          /* Still end with \r\n unless that's really not possible */
          if( len >= 2 ) buf[len - 2] = '\r';
          if( len >= 1 ) buf[len - 1] = '\n';
      }
  
      if( opt.transport == MBEDTLS_SSL_TRANSPORT_STREAM )
      {
          written = 0;
          frags = 0;
  
          do
          {
              while( ( ret = mbedtls_ssl_write( &ssl, buf + written,
                                                len - written ) ) < 0 )
              {
                  if( ret != MBEDTLS_ERR_SSL_WANT_READ &&
                      ret != MBEDTLS_ERR_SSL_WANT_WRITE &&
                      ret != MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS )
                  {
                      mbedtls_printf( " failed\n  ! mbedtls_ssl_write returned -0x%x\n\n",
                                      (unsigned int) -ret );
                      goto exit;
                  }
  
                  /* For event-driven IO, wait for socket to become available */
                  if( opt.event == 1 /* level triggered IO */ )
                  {
  #if defined(MBEDTLS_TIMING_C)
                      idle( &server_fd, &timer, ret );
  #else
                      idle( &server_fd, ret );
  #endif
                  }
              }
  
              frags++;
              written += ret;
          }
          while( written < len );
      }
      else /* Not stream, so datagram */
      {
          while( 1 )
          {
              ret = mbedtls_ssl_write( &ssl, buf, len );
  
  #if defined(MBEDTLS_ECP_RESTARTABLE)
              if( ret == MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS )
                  continue;
  #endif
  
              if( ret != MBEDTLS_ERR_SSL_WANT_READ &&
                  ret != MBEDTLS_ERR_SSL_WANT_WRITE )
                  break;
  
              /* For event-driven IO, wait for socket to become available */
              if( opt.event == 1 /* level triggered IO */ )
              {
  #if defined(MBEDTLS_TIMING_C)
                  idle( &server_fd, &timer, ret );
  #else
                  idle( &server_fd, ret );
  #endif
              }
          }
  
          if( ret < 0 )
          {
              mbedtls_printf( " failed\n  ! mbedtls_ssl_write returned %d\n\n",
                              ret );
              goto exit;
          }
  
          frags = 1;
          written = ret;
  
          if( written < len )
          {
              mbedtls_printf( " warning\n  ! request didn't fit into single datagram and "
                              "was truncated to size %u", (unsigned) written );
          }
      }
  
      buf[written] = '\0';
      mbedtls_printf( " %d bytes written in %d fragments\n\n%s\n",
                      written, frags, (char *) buf );
  
      /* Send a non-empty request if request_size == 0 */
      if ( len == 0 )
      {
          opt.request_size = DFL_REQUEST_SIZE;
          goto send_request;
      }
  
      /*
       * 7. Read the HTTP response
       */
      mbedtls_printf( "  < Read from server:" );
      fflush( stdout );
  
      /*
       * TLS and DTLS need different reading styles (stream vs datagram)
       */
      if( opt.transport == MBEDTLS_SSL_TRANSPORT_STREAM )
      {
          do
          {
              len = sizeof( buf ) - 1;
              memset( buf, 0, sizeof( buf ) );
              ret = mbedtls_ssl_read( &ssl, buf, len );
  
  #if defined(MBEDTLS_ECP_RESTARTABLE)
              if( ret == MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS )
                  continue;
  #endif
  
              if( ret == MBEDTLS_ERR_SSL_WANT_READ ||
                  ret == MBEDTLS_ERR_SSL_WANT_WRITE )
              {
                  /* For event-driven IO, wait for socket to become available */
                  if( opt.event == 1 /* level triggered IO */ )
                  {
  #if defined(MBEDTLS_TIMING_C)
                      idle( &server_fd, &timer, ret );
  #else
                      idle( &server_fd, ret );
  #endif
                  }
                  continue;
              }
  
              if( ret <= 0 )
              {
                  switch( ret )
                  {
                      case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
                          mbedtls_printf( " connection was closed gracefully\n" );
                          ret = 0;
                          goto close_notify;
  
                      case 0:
                      case MBEDTLS_ERR_NET_CONN_RESET:
                          mbedtls_printf( " connection was reset by peer\n" );
                          ret = 0;
                          goto reconnect;
  
                      default:
                          mbedtls_printf( " mbedtls_ssl_read returned -0x%x\n",
                                          (unsigned int) -ret );
                          goto exit;
                  }
              }
  
              len = ret;
              buf[len] = '\0';
              mbedtls_printf( " %d bytes read\n\n%s", len, (char *) buf );
  
              /* End of message should be detected according to the syntax of the
               * application protocol (eg HTTP), just use a dummy test here. */
              if( ret > 0 && buf[len-1] == '\n' )
              {
                  ret = 0;
                  break;
              }
          }
          while( 1 );
      }
      else /* Not stream, so datagram */
      {
          len = sizeof( buf ) - 1;
          memset( buf, 0, sizeof( buf ) );
  
          while( 1 )
          {
              ret = mbedtls_ssl_read( &ssl, buf, len );
  
  #if defined(MBEDTLS_ECP_RESTARTABLE)
              if( ret == MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS )
                  continue;
  #endif
  
              if( ret != MBEDTLS_ERR_SSL_WANT_READ &&
                  ret != MBEDTLS_ERR_SSL_WANT_WRITE )
                  break;
  
              /* For event-driven IO, wait for socket to become available */
              if( opt.event == 1 /* level triggered IO */ )
              {
  #if defined(MBEDTLS_TIMING_C)
                  idle( &server_fd, &timer, ret );
  #else
                  idle( &server_fd, ret );
  #endif
              }
          }
  
          if( ret <= 0 )
          {
              switch( ret )
              {
                  case MBEDTLS_ERR_SSL_TIMEOUT:
                      mbedtls_printf( " timeout\n" );
                      if( retry_left-- > 0 )
                          goto send_request;
                      goto exit;
  
                  case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
                      mbedtls_printf( " connection was closed gracefully\n" );
                      ret = 0;
                      goto close_notify;
  
                  default:
                      mbedtls_printf( " mbedtls_ssl_read returned -0x%x\n", (unsigned int) -ret );
                      goto exit;
              }
          }
  
          len = ret;
          buf[len] = '\0';
          mbedtls_printf( " %d bytes read\n\n%s", len, (char *) buf );
          ret = 0;
      }
  
      /*
       * 7b. Simulate hard reset and reconnect from same port?
       */
      if( opt.reconnect_hard != 0 )
      {
          opt.reconnect_hard = 0;
  
          mbedtls_printf( "  . Restarting connection from same port..." );
          fflush( stdout );
  
  #if defined(MBEDTLS_X509_CRT_PARSE_C)
          memset( peer_crt_info, 0, sizeof( peer_crt_info ) );
  #endif /* MBEDTLS_X509_CRT_PARSE_C */
  
          if( ( ret = mbedtls_ssl_session_reset( &ssl ) ) != 0 )
          {
              mbedtls_printf( " failed\n  ! mbedtls_ssl_session_reset returned -0x%x\n\n",
                              (unsigned int) -ret );
              goto exit;
          }
  
          while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
          {
              if( ret != MBEDTLS_ERR_SSL_WANT_READ &&
                  ret != MBEDTLS_ERR_SSL_WANT_WRITE &&
                  ret != MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS )
              {
                  mbedtls_printf( " failed\n  ! mbedtls_ssl_handshake returned -0x%x\n\n",
                                  (unsigned int) -ret );
                  goto exit;
              }
  
              /* For event-driven IO, wait for socket to become available */
              if( opt.event == 1 /* level triggered IO */ )
              {
  #if defined(MBEDTLS_TIMING_C)
                  idle( &server_fd, &timer, ret );
  #else
                  idle( &server_fd, ret );
  #endif
              }
          }
  
          mbedtls_printf( " ok\n" );
  
          goto send_request;
      }
  
      /*
       * 7c. Simulate serialize/deserialize and go back to data exchange
       */
  #if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION)
      if( opt.serialize != 0 )
      {
          size_t buf_len;
  
          mbedtls_printf( "  . Serializing live connection..." );
  
          ret = mbedtls_ssl_context_save( &ssl, NULL, 0, &buf_len );
          if( ret != MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL )
          {
              mbedtls_printf( " failed\n  ! mbedtls_ssl_context_save returned "
                              "-0x%x\n\n", (unsigned int) -ret );
  
              goto exit;
          }
  
          if( ( context_buf = mbedtls_calloc( 1, buf_len ) ) == NULL )
          {
              mbedtls_printf( " failed\n  ! Couldn't allocate buffer for "
                              "serialized context" );
  
              goto exit;
          }
          context_buf_len = buf_len;
  
          if( ( ret = mbedtls_ssl_context_save( &ssl, context_buf,
                                                buf_len, &buf_len ) ) != 0 )
          {
              mbedtls_printf( " failed\n  ! mbedtls_ssl_context_save returned "
                              "-0x%x\n\n", (unsigned int) -ret );
  
              goto exit;
          }
  
          mbedtls_printf( " ok\n" );
  
          /* Save serialized context to the 'opt.context_file' as a base64 code */
          if( 0 < strlen( opt.context_file ) )
          {
              FILE *b64_file;
              uint8_t *b64_buf;
              size_t b64_len;
  
              mbedtls_printf( "  . Save serialized context to a file... " );
  
              mbedtls_base64_encode( NULL, 0, &b64_len, context_buf, buf_len );
  
              if( ( b64_buf = mbedtls_calloc( 1, b64_len ) ) == NULL )
              {
                  mbedtls_printf( "failed\n  ! Couldn't allocate buffer for "
                                  "the base64 code\n" );
                  goto exit;
              }
  
              if( ( ret = mbedtls_base64_encode( b64_buf, b64_len, &b64_len,
                                                 context_buf, buf_len ) ) != 0 )
              {
                  mbedtls_printf( "failed\n  ! mbedtls_base64_encode returned "
                              "-0x%x\n", (unsigned int) -ret );
                  mbedtls_free( b64_buf );
                  goto exit;
              }
  
              if( ( b64_file = fopen( opt.context_file, "w" ) ) == NULL )
              {
                  mbedtls_printf( "failed\n  ! Cannot open '%s' for writing.\n",
                                  opt.context_file );
                  mbedtls_free( b64_buf );
                  goto exit;
              }
  
              if( b64_len != fwrite( b64_buf, 1, b64_len, b64_file ) )
              {
                  mbedtls_printf( "failed\n  ! fwrite(%ld bytes) failed\n",
                                  (long) b64_len );
                  mbedtls_free( b64_buf );
                  fclose( b64_file );
                  goto exit;
              }
  
              mbedtls_free( b64_buf );
              fclose( b64_file );
  
              mbedtls_printf( "ok\n" );
          }
  
          if( opt.serialize == 1 )
          {
              /* nothing to do here, done by context_save() already */
              mbedtls_printf( "  . Context has been reset... ok\n" );
          }
  
          if( opt.serialize == 2 )
          {
              mbedtls_printf( "  . Freeing and reinitializing context..." );
  
              mbedtls_ssl_free( &ssl );
  
              mbedtls_ssl_init( &ssl );
  
              if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
              {
                  mbedtls_printf( " failed\n  ! mbedtls_ssl_setup returned "
                                  "-0x%x\n\n", (unsigned int) -ret );
                  goto exit;
              }
  
              if( opt.nbio == 2 )
                  mbedtls_ssl_set_bio( &ssl, &server_fd, delayed_send,
                                       delayed_recv, NULL );
              else
                  mbedtls_ssl_set_bio( &ssl, &server_fd, mbedtls_net_send,
                              mbedtls_net_recv,
                              opt.nbio == 0 ? mbedtls_net_recv_timeout : NULL );
  
  #if defined(MBEDTLS_TIMING_C)
                  mbedtls_ssl_set_timer_cb( &ssl, &timer,
                                            mbedtls_timing_set_delay,
                                            mbedtls_timing_get_delay );
  #endif /* MBEDTLS_TIMING_C */
  
              mbedtls_printf( " ok\n" );
          }
  
          mbedtls_printf( "  . Deserializing connection..." );
  
          if( ( ret = mbedtls_ssl_context_load( &ssl, context_buf,
                                                buf_len ) ) != 0 )
          {
              mbedtls_printf( "failed\n  ! mbedtls_ssl_context_load returned "
                              "-0x%x\n\n", (unsigned int) -ret );
  
              goto exit;
          }
  
          mbedtls_free( context_buf );
          context_buf = NULL;
          context_buf_len = 0;
  
          mbedtls_printf( " ok\n" );
      }
  #endif /* MBEDTLS_SSL_CONTEXT_SERIALIZATION */
  
      /*
       * 7d. Continue doing data exchanges?
       */
      if( --opt.exchanges > 0 )
          goto send_request;
  
      /*
       * 8. Done, cleanly close the connection
       */
  close_notify:
      mbedtls_printf( "  . Closing the connection..." );
      fflush( stdout );
  
      /*
       * Most of the time sending a close_notify before closing is the right
       * thing to do. However, when the server already knows how many messages
       * are expected and closes the connection by itself, this alert becomes
       * redundant. Sometimes with DTLS this redundancy becomes a problem by
       * leading to a race condition where the server might close the connection
       * before seeing the alert, and since UDP is connection-less when the
       * alert arrives it will be seen as a new connection, which will fail as
       * the alert is clearly not a valid ClientHello. This may cause spurious
       * failures in tests that use DTLS and resumption with ssl_server2 in
       * ssl-opt.sh, avoided by enabling skip_close_notify client-side.
       */
      if( opt.skip_close_notify == 0 )
      {
          /* No error checking, the connection might be closed already */
          do ret = mbedtls_ssl_close_notify( &ssl );
          while( ret == MBEDTLS_ERR_SSL_WANT_WRITE );
          ret = 0;
      }
  
      mbedtls_printf( " done\n" );
  
      /*
       * 9. Reconnect?
       */
  reconnect:
      if( opt.reconnect != 0 )
      {
          --opt.reconnect;
  
          mbedtls_net_free( &server_fd );
  
  #if defined(MBEDTLS_TIMING_C)
          if( opt.reco_delay > 0 )
              mbedtls_net_usleep( 1000000 * opt.reco_delay );
  #endif
  
          mbedtls_printf( "  . Reconnecting with saved session..." );
  
  #if defined(MBEDTLS_X509_CRT_PARSE_C)
          memset( peer_crt_info, 0, sizeof( peer_crt_info ) );
  #endif /* MBEDTLS_X509_CRT_PARSE_C */
  
          if( ( ret = mbedtls_ssl_session_reset( &ssl ) ) != 0 )
          {
              mbedtls_printf( " failed\n  ! mbedtls_ssl_session_reset returned -0x%x\n\n",
                              (unsigned int) -ret );
              goto exit;
          }
  
          if( opt.reco_mode == 1 )
          {
              if( ( ret = mbedtls_ssl_session_load( &saved_session,
                                                    session_data,
                                                    session_data_len ) ) != 0 )
              {
                  mbedtls_printf( " failed\n  ! mbedtls_ssl_session_load returned -0x%x\n\n",
                                  (unsigned int) -ret );
                  goto exit;
              }
          }
  
          if( ( ret = mbedtls_ssl_set_session( &ssl, &saved_session ) ) != 0 )
          {
              mbedtls_printf( " failed\n  ! mbedtls_ssl_set_session returned -0x%x\n\n",
                              (unsigned int) -ret );
              goto exit;
          }
  
          if( ( ret = mbedtls_net_connect( &server_fd,
                          opt.server_addr, opt.server_port,
                          opt.transport == MBEDTLS_SSL_TRANSPORT_STREAM ?
                          MBEDTLS_NET_PROTO_TCP : MBEDTLS_NET_PROTO_UDP ) ) != 0 )
          {
              mbedtls_printf( " failed\n  ! mbedtls_net_connect returned -0x%x\n\n",
                              (unsigned int) -ret );
              goto exit;
          }
  
          if( opt.nbio > 0 )
              ret = mbedtls_net_set_nonblock( &server_fd );
          else
              ret = mbedtls_net_set_block( &server_fd );
          if( ret != 0 )
          {
              mbedtls_printf( " failed\n  ! net_set_(non)block() returned -0x%x\n\n",
                              (unsigned int) -ret );
              goto exit;
          }
  
          while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
          {
              if( ret != MBEDTLS_ERR_SSL_WANT_READ &&
                  ret != MBEDTLS_ERR_SSL_WANT_WRITE &&
                  ret != MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS )
              {
                  mbedtls_printf( " failed\n  ! mbedtls_ssl_handshake returned -0x%x\n\n",
                                  (unsigned int) -ret );
                  goto exit;
              }
          }
  
          mbedtls_printf( " ok\n" );
  
          goto send_request;
      }
  
      /*
       * Cleanup and exit
       */
  exit:
  #ifdef MBEDTLS_ERROR_C
      if( ret != 0 )
      {
          char error_buf[100];
          mbedtls_strerror( ret, error_buf, 100 );
          mbedtls_printf("Last error was: -0x%X - %s\n\n", (unsigned int) -ret, error_buf );
      }
  #endif
  
      mbedtls_net_free( &server_fd );
  
  #if defined(MBEDTLS_X509_CRT_PARSE_C)
      mbedtls_x509_crt_free( &clicert );
      mbedtls_x509_crt_free( &cacert );
      mbedtls_pk_free( &pkey );
  #if defined(MBEDTLS_USE_PSA_CRYPTO)
      psa_destroy_key( key_slot );
  #endif
  #endif
      mbedtls_ssl_session_free( &saved_session );
      mbedtls_ssl_free( &ssl );
      mbedtls_ssl_config_free( &conf );
      mbedtls_ctr_drbg_free( &ctr_drbg );
      mbedtls_entropy_free( &entropy );
      if( session_data != NULL )
          mbedtls_platform_zeroize( session_data, session_data_len );
      mbedtls_free( session_data );
  #if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION)
      if( context_buf != NULL )
          mbedtls_platform_zeroize( context_buf, context_buf_len );
      mbedtls_free( context_buf );
  #endif
  
  #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) && \
      defined(MBEDTLS_USE_PSA_CRYPTO)
      if( opt.psk_opaque != 0 )
      {
          /* This is ok even if the slot hasn't been
           * initialized (we might have jumed here
           * immediately because of bad cmd line params,
           * for example). */
          status = psa_destroy_key( slot );
          if( ( status != PSA_SUCCESS ) &&
              ( opt.query_config_mode == DFL_QUERY_CONFIG_MODE ) )
          {
              mbedtls_printf( "Failed to destroy key slot %u - error was %d",
                              (unsigned) slot, (int) status );
              if( ret == 0 )
                  ret = MBEDTLS_ERR_SSL_HW_ACCEL_FAILED;
          }
      }
  #endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED &&
            MBEDTLS_USE_PSA_CRYPTO */
  
  #if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
  #if defined(MBEDTLS_MEMORY_DEBUG)
      mbedtls_memory_buffer_alloc_status();
  #endif
      mbedtls_memory_buffer_alloc_free();
  #endif
  
  #if defined(_WIN32)
      if( opt.query_config_mode == DFL_QUERY_CONFIG_MODE )
      {
          mbedtls_printf( "  + Press Enter to exit this program.\n" );
          fflush( stdout ); getchar();
      }
  #endif
  
      // Shell can not handle large exit numbers -> 1 for errors
      if( ret < 0 )
          ret = 1;
  
      if( opt.query_config_mode == DFL_QUERY_CONFIG_MODE )
          mbedtls_exit( ret );
      else
          mbedtls_exit( query_config_ret );
  }
  #endif /* !MBEDTLS_SSL_TEST_IMPOSSIBLE && MBEDTLS_SSL_CLI_C */
  