text: /* wolf_client.c
   *
   * Copyright (C) 2006-2019 wolfSSL Inc.
   *
   * This file is part of wolfSSL.
   *
   * wolfSSL is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * wolfSSL is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
   */
  
  #include <stdio.h>
  #include <string.h>
  #include "r_t4_itcpip.h"
  
  #include "wolfssl/wolfcrypt/settings.h"
  #include "wolfssl/ssl.h"
  #include "wolfssl/certs_test.h"
  #include "wolf_demo.h"
  
  ER    t4_tcp_callback(ID cepid, FN fncd , VP p_parblk);
  
  static int my_IORecv(WOLFSSL* ssl, char* buff, int sz, void* ctx)
  {
      int ret;
      ID  cepid;
  
      if(ctx != NULL)cepid = *(ID *)ctx;
      else return WOLFSSL_CBIO_ERR_GENERAL;
  
      ret = tcp_rcv_dat(cepid, buff, sz, TMO_FEVR);
      if(ret > 0)return ret;
      else         return WOLFSSL_CBIO_ERR_GENERAL;
  }
  
  static int my_IOSend(WOLFSSL* ssl, char* buff, int sz, void* ctx)
  {
      int ret;
      ID  cepid;
  
      if(ctx != NULL)cepid = *(ID *)ctx;
      else return WOLFSSL_CBIO_ERR_GENERAL;
  
      ret = tcp_snd_dat(cepid, buff, sz, TMO_FEVR);
      if(ret == sz)return ret;
      else         return WOLFSSL_CBIO_ERR_GENERAL;
  }
  
  static int getIPaddr(char *arg)
  {
      int a1, a2, a3, a4;
      if(sscanf(arg, "%d.%d.%d.%d", &a1, &a2, &a3, &a4) == 4)
           return (a1 << 24) | (a2 << 16) | (a3 << 8) | a4;
      else return 0;
  }
  
  static int getPort(char *arg)
  {
      int port;
      if(sscanf(arg, "%d", &port) == 1)
           return port;
      else return 0;
  }
  
  WOLFSSL_CTX *wolfSSL_TLS_client_init()
  {
  
      WOLFSSL_CTX* ctx;
      #ifndef NO_FILESYSTEM
          #ifdef USE_ECC_CERT
          char *cert       = "./certs/ca-ecc-cert.pem";
          #else
          char *cert       = "./certs/ca-cert.pem";
          #endif
      #else
          #ifdef USE_ECC_CERT
          const unsigned char *cert       = ca_ecc_der_256;
          #define  SIZEOF_CERT sizeof_ca_ecc_der_256
          #else
          const unsigned char *cert       = ca_cert_der_2048;
          #define  SIZEOF_CERT sizeof_ca_cert_der_2048
          #endif
      #endif
  
      wolfSSL_Init();
      #ifdef DEBUG_WOLFSSL
          wolfSSL_Debugging_ON();
      #endif
  
      /* Create and initialize WOLFSSL_CTX */
      if ((ctx = wolfSSL_CTX_new(wolfTLSv1_2_client_method_ex((void *)NULL))) == NULL) {
          printf("ERROR: failed to create WOLFSSL_CTX\n");
          return NULL;
      }
  
      #if !defined(NO_FILESYSTEM)
      if (wolfSSL_CTX_load_verify_locations(ctx, cert, 0) != SSL_SUCCESS) {
          printf("ERROR: can't load \"%s\"\n", cert);
          return NULL;
      }
      #else
      if (wolfSSL_CTX_load_verify_buffer(ctx, cert, SIZEOF_CERT, SSL_FILETYPE_ASN1) != SSL_SUCCESS){
             printf("ERROR: can't load certificate data\n");
         return NULL;
      }
      #endif
  
  
      /* Register callbacks */
      wolfSSL_SetIORecv(ctx, my_IORecv);
      wolfSSL_SetIOSend(ctx, my_IOSend);
      return (void *)ctx;
  
  }
  
  
  void wolfSSL_TLS_client(void *v_ctx, func_args *args)
  {
      ID cepid = 1;
      ER ercd;
      int ret;
      WOLFSSL_CTX *ctx = (WOLFSSL_CTX *)v_ctx;
      WOLFSSL *ssl;
      #define BUFF_SIZE 256
      static const char sendBuff[]= "Hello Server\n" ;
      char    rcvBuff[BUFF_SIZE] = {0};
      static T_IPV4EP my_addr = { 0, 0 };
      T_IPV4EP dst_addr;
  
      if(args->argc >= 2){
  	    if((dst_addr.ipaddr = getIPaddr(args->argv[1])) == 0){
  		printf("ERROR: IP address\n");
  	        return;
  	    }
  	    if((dst_addr.portno = getPort(args->argv[2])) == 0){
  		printf("ERROR: IP address\n");
  	        return;
  	    }
      }
  
      if((ercd = tcp_con_cep(cepid, &my_addr, &dst_addr, TMO_FEVR)) != E_OK) {
          printf("ERROR TCP Connect: %d\n", ercd);
          return;
      }
  
      if((ssl = wolfSSL_new(ctx)) == NULL) {
          printf("ERROR wolfSSL_new: %d\n", wolfSSL_get_error(ssl, 0));
          return;
      }
  
      /* set callback context */
      wolfSSL_SetIOReadCtx(ssl, (void *)&cepid);
      wolfSSL_SetIOWriteCtx(ssl, (void *)&cepid);
  
      if(wolfSSL_connect(ssl) != SSL_SUCCESS) {
          printf("ERROR SSL connect: %d\n",  wolfSSL_get_error(ssl, 0));
          return;
      }
  
      if (wolfSSL_write(ssl, sendBuff, strlen(sendBuff)) != strlen(sendBuff)) {
          printf("ERROR SSL write: %d\n", wolfSSL_get_error(ssl, 0));
          return;
      }
  
      if ((ret=wolfSSL_read(ssl, rcvBuff, BUFF_SIZE)) < 0) {
          printf("ERROR SSL read: %d\n", wolfSSL_get_error(ssl, 0));
          return;
      }
  
      rcvBuff[ret] = '\0' ;
      printf("Received: %s\n", rcvBuff);
  
      /* frees all data before client termination */
      wolfSSL_free(ssl);
      wolfSSL_CTX_free(ctx);
      wolfSSL_Cleanup();
  
      tcp_sht_cep(cepid);
      tcp_cls_cep(cepid, TMO_FEVR);
  
      return;
  }
  