2 * SSL client for SMTP servers
4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
5 * SPDX-License-Identifier: Apache-2.0
7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
8 * not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
19 * This file is part of mbed TLS (https://tls.mbed.org)
22 /* Enable definition of gethostname() even when compiling with -std=c99. Must
23 * be set before config.h, which pulls in glibc's features.h indirectly.
24 * Harmless on other platforms. */
25 #define _POSIX_C_SOURCE 200112L
27 #if !defined(MBEDTLS_CONFIG_FILE)
28 #include "mbedtls/config.h"
30 #include MBEDTLS_CONFIG_FILE
33 #if defined(MBEDTLS_PLATFORM_C)
34 #include "mbedtls/platform.h"
38 #define mbedtls_time time
39 #define mbedtls_time_t time_t
40 #define mbedtls_fprintf fprintf
41 #define mbedtls_printf printf
42 #define mbedtls_exit exit
43 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
44 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
45 #endif /* MBEDTLS_PLATFORM_C */
47 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
48 !defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_CLI_C) || \
49 !defined(MBEDTLS_NET_C) || !defined(MBEDTLS_RSA_C) || \
50 !defined(MBEDTLS_CTR_DRBG_C) || !defined(MBEDTLS_X509_CRT_PARSE_C) || \
51 !defined(MBEDTLS_FS_IO)
54 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
55 "MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_CLI_C and/or "
56 "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
57 "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C "
63 #include "mbedtls/base64.h"
64 #include "mbedtls/error.h"
65 #include "mbedtls/net_sockets.h"
66 #include "mbedtls/ssl.h"
67 #include "mbedtls/entropy.h"
68 #include "mbedtls/ctr_drbg.h"
69 #include "mbedtls/certs.h"
70 #include "mbedtls/x509.h"
75 #if !defined(_MSC_VER) || defined(EFIX64) || defined(EFI32)
81 #if defined(_WIN32) || defined(_WIN32_WCE)
86 #if defined(_WIN32_WCE)
87 #pragma comment( lib, "ws2.lib" )
89 #pragma comment( lib, "ws2_32.lib" )
94 #define DFL_SERVER_NAME "localhost"
95 #define DFL_SERVER_PORT "465"
96 #define DFL_USER_NAME "user"
97 #define DFL_USER_PWD "password"
98 #define DFL_MAIL_FROM ""
99 #define DFL_MAIL_TO ""
100 #define DFL_DEBUG_LEVEL 0
101 #define DFL_CA_FILE ""
102 #define DFL_CRT_FILE ""
103 #define DFL_KEY_FILE ""
104 #define DFL_FORCE_CIPHER 0
106 #define DFL_AUTHENTICATION 0
108 #define MODE_SSL_TLS 0
109 #define MODE_STARTTLS 0
111 #if defined(MBEDTLS_BASE64_C)
113 " authentication=%%d default: 0 (disabled)\n" \
114 " user_name=%%s default: \"" DFL_USER_NAME "\"\n" \
115 " user_pwd=%%s default: \"" DFL_USER_PWD "\"\n"
118 " authentication options disabled. (Require MBEDTLS_BASE64_C)\n"
119 #endif /* MBEDTLS_BASE64_C */
121 #if defined(MBEDTLS_FS_IO)
123 " ca_file=%%s default: \"\" (pre-loaded)\n" \
124 " crt_file=%%s default: \"\" (pre-loaded)\n" \
125 " key_file=%%s default: \"\" (pre-loaded)\n"
128 " No file operations available (MBEDTLS_FS_IO not defined)\n"
129 #endif /* MBEDTLS_FS_IO */
132 "\n usage: ssl_mail_client param=<>...\n" \
133 "\n acceptable parameters:\n" \
134 " server_name=%%s default: " DFL_SERVER_NAME "\n" \
135 " server_port=%%d default: " DFL_SERVER_PORT "\n" \
136 " debug_level=%%d default: 0 (disabled)\n" \
137 " mode=%%d default: 0 (SSL/TLS) (1 for STARTTLS)\n" \
139 " mail_from=%%s default: \"\"\n" \
140 " mail_to=%%s default: \"\"\n" \
142 " force_ciphersuite=<name> default: all enabled\n" \
143 " acceptable ciphersuite names:\n"
145 #if defined(MBEDTLS_CHECK_PARAMS)
146 #include "mbedtls/platform_util.h"
147 void mbedtls_param_failed( const char *failure_condition,
151 mbedtls_printf( "%s:%i: Input param failed - %s\n",
152 file, line, failure_condition );
153 mbedtls_exit( MBEDTLS_EXIT_FAILURE );
162 const char *server_name; /* hostname of the server (client only) */
163 const char *server_port; /* port on which the ssl service runs */
164 int debug_level; /* level of debugging */
165 int authentication; /* if authentication is required */
166 int mode; /* SSL/TLS (0) or STARTTLS (1) */
167 const char *user_name; /* username to use for authentication */
168 const char *user_pwd; /* password to use for authentication */
169 const char *mail_from; /* E-Mail address to use as sender */
170 const char *mail_to; /* E-Mail address to use as recipient */
171 const char *ca_file; /* the file with the CA certificate(s) */
172 const char *crt_file; /* the file with the client certificate */
173 const char *key_file; /* the file with the client key */
174 int force_ciphersuite[2]; /* protocol/ciphersuite to use, or all */
177 static void my_debug( void *ctx, int level,
178 const char *file, int line,
183 mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
184 fflush( (FILE *) ctx );
187 static int do_handshake( mbedtls_ssl_context *ssl )
191 unsigned char buf[1024];
192 memset(buf, 0, 1024);
197 mbedtls_printf( " . Performing the SSL/TLS handshake..." );
200 while( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
202 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
204 #if defined(MBEDTLS_ERROR_C)
205 mbedtls_strerror( ret, (char *) buf, 1024 );
207 mbedtls_printf( " failed\n ! mbedtls_ssl_handshake returned %d: %s\n\n", ret, buf );
212 mbedtls_printf( " ok\n [ Ciphersuite is %s ]\n",
213 mbedtls_ssl_get_ciphersuite( ssl ) );
216 * 5. Verify the server certificate
218 mbedtls_printf( " . Verifying peer X.509 certificate..." );
220 /* In real life, we probably want to bail out when ret != 0 */
221 if( ( flags = mbedtls_ssl_get_verify_result( ssl ) ) != 0 )
225 mbedtls_printf( " failed\n" );
227 mbedtls_x509_crt_verify_info( vrfy_buf, sizeof( vrfy_buf ), " ! ", flags );
229 mbedtls_printf( "%s\n", vrfy_buf );
232 mbedtls_printf( " ok\n" );
234 mbedtls_printf( " . Peer certificate information ...\n" );
235 mbedtls_x509_crt_info( (char *) buf, sizeof( buf ) - 1, " ",
236 mbedtls_ssl_get_peer_cert( ssl ) );
237 mbedtls_printf( "%s\n", buf );
242 static int write_ssl_data( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len )
246 mbedtls_printf("\n%s", buf);
247 while( len && ( ret = mbedtls_ssl_write( ssl, buf, len ) ) <= 0 )
249 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
251 mbedtls_printf( " failed\n ! mbedtls_ssl_write returned %d\n\n", ret );
259 static int write_ssl_and_get_response( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len )
262 unsigned char data[128];
266 mbedtls_printf("\n%s", buf);
267 while( len && ( ret = mbedtls_ssl_write( ssl, buf, len ) ) <= 0 )
269 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
271 mbedtls_printf( " failed\n ! mbedtls_ssl_write returned %d\n\n", ret );
278 len = sizeof( data ) - 1;
279 memset( data, 0, sizeof( data ) );
280 ret = mbedtls_ssl_read( ssl, data, len );
282 if( ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE )
285 if( ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY )
290 mbedtls_printf( "failed\n ! mbedtls_ssl_read returned %d\n\n", ret );
294 mbedtls_printf("\n%s", data);
296 for( i = 0; i < len; i++ )
298 if( data[i] != '\n' )
301 code[ idx++ ] = data[i];
305 if( idx == 4 && code[0] >= '0' && code[0] <= '9' && code[3] == ' ' )
317 static int write_and_get_response( mbedtls_net_context *sock_fd, unsigned char *buf, size_t len )
320 unsigned char data[128];
324 mbedtls_printf("\n%s", buf);
325 if( len && ( ret = mbedtls_net_send( sock_fd, buf, len ) ) <= 0 )
327 mbedtls_printf( " failed\n ! mbedtls_net_send returned %d\n\n", ret );
333 len = sizeof( data ) - 1;
334 memset( data, 0, sizeof( data ) );
335 ret = mbedtls_net_recv( sock_fd, data, len );
339 mbedtls_printf( "failed\n ! mbedtls_net_recv returned %d\n\n", ret );
344 mbedtls_printf("\n%s", data);
346 for( i = 0; i < len; i++ )
348 if( data[i] != '\n' )
351 code[ idx++ ] = data[i];
355 if( idx == 4 && code[0] >= '0' && code[0] <= '9' && code[3] == ' ' )
367 int main( int argc, char *argv[] )
370 int exit_code = MBEDTLS_EXIT_FAILURE;
371 mbedtls_net_context server_fd;
372 #if defined(MBEDTLS_BASE64_C)
373 unsigned char base[1024];
374 /* buf is used as the destination buffer for printing base with the format:
375 * "%s\r\n". Hence, the size of buf should be at least the size of base
376 * plus 2 bytes for the \r and \n characters.
378 unsigned char buf[sizeof( base ) + 2];
380 unsigned char buf[1024];
383 const char *pers = "ssl_mail_client";
385 mbedtls_entropy_context entropy;
386 mbedtls_ctr_drbg_context ctr_drbg;
387 mbedtls_ssl_context ssl;
388 mbedtls_ssl_config conf;
389 mbedtls_x509_crt cacert;
390 mbedtls_x509_crt clicert;
391 mbedtls_pk_context pkey;
398 * Make sure memory references are valid in case we exit early.
400 mbedtls_net_init( &server_fd );
401 mbedtls_ssl_init( &ssl );
402 mbedtls_ssl_config_init( &conf );
403 memset( &buf, 0, sizeof( buf ) );
404 mbedtls_x509_crt_init( &cacert );
405 mbedtls_x509_crt_init( &clicert );
406 mbedtls_pk_init( &pkey );
407 mbedtls_ctr_drbg_init( &ctr_drbg );
412 mbedtls_printf( USAGE );
414 list = mbedtls_ssl_list_ciphersuites();
417 mbedtls_printf(" %s\n", mbedtls_ssl_get_ciphersuite_name( *list ) );
420 mbedtls_printf("\n");
424 opt.server_name = DFL_SERVER_NAME;
425 opt.server_port = DFL_SERVER_PORT;
426 opt.debug_level = DFL_DEBUG_LEVEL;
427 opt.authentication = DFL_AUTHENTICATION;
429 opt.user_name = DFL_USER_NAME;
430 opt.user_pwd = DFL_USER_PWD;
431 opt.mail_from = DFL_MAIL_FROM;
432 opt.mail_to = DFL_MAIL_TO;
433 opt.ca_file = DFL_CA_FILE;
434 opt.crt_file = DFL_CRT_FILE;
435 opt.key_file = DFL_KEY_FILE;
436 opt.force_ciphersuite[0]= DFL_FORCE_CIPHER;
438 for( i = 1; i < argc; i++ )
441 if( ( q = strchr( p, '=' ) ) == NULL )
445 if( strcmp( p, "server_name" ) == 0 )
447 else if( strcmp( p, "server_port" ) == 0 )
449 else if( strcmp( p, "debug_level" ) == 0 )
451 opt.debug_level = atoi( q );
452 if( opt.debug_level < 0 || opt.debug_level > 65535 )
455 else if( strcmp( p, "authentication" ) == 0 )
457 opt.authentication = atoi( q );
458 if( opt.authentication < 0 || opt.authentication > 1 )
461 else if( strcmp( p, "mode" ) == 0 )
463 opt.mode = atoi( q );
464 if( opt.mode < 0 || opt.mode > 1 )
467 else if( strcmp( p, "user_name" ) == 0 )
469 else if( strcmp( p, "user_pwd" ) == 0 )
471 else if( strcmp( p, "mail_from" ) == 0 )
473 else if( strcmp( p, "mail_to" ) == 0 )
475 else if( strcmp( p, "ca_file" ) == 0 )
477 else if( strcmp( p, "crt_file" ) == 0 )
479 else if( strcmp( p, "key_file" ) == 0 )
481 else if( strcmp( p, "force_ciphersuite" ) == 0 )
483 opt.force_ciphersuite[0] = -1;
485 opt.force_ciphersuite[0] = mbedtls_ssl_get_ciphersuite_id( q );
487 if( opt.force_ciphersuite[0] <= 0 )
490 opt.force_ciphersuite[1] = 0;
497 * 0. Initialize the RNG and the session data
499 mbedtls_printf( "\n . Seeding the random number generator..." );
502 mbedtls_entropy_init( &entropy );
503 if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
504 (const unsigned char *) pers,
505 strlen( pers ) ) ) != 0 )
507 mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
511 mbedtls_printf( " ok\n" );
514 * 1.1. Load the trusted CA
516 mbedtls_printf( " . Loading the CA root certificate ..." );
519 #if defined(MBEDTLS_FS_IO)
520 if( strlen( opt.ca_file ) )
521 ret = mbedtls_x509_crt_parse_file( &cacert, opt.ca_file );
524 #if defined(MBEDTLS_CERTS_C) && defined(MBEDTLS_PEM_PARSE_C)
525 ret = mbedtls_x509_crt_parse( &cacert, (const unsigned char *) mbedtls_test_cas_pem,
526 mbedtls_test_cas_pem_len );
529 mbedtls_printf("MBEDTLS_CERTS_C and/or MBEDTLS_PEM_PARSE_C not defined.");
535 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse returned %d\n\n", ret );
539 mbedtls_printf( " ok (%d skipped)\n", ret );
542 * 1.2. Load own certificate and private key
544 * (can be skipped if client authentication is not required)
546 mbedtls_printf( " . Loading the client cert. and key..." );
549 #if defined(MBEDTLS_FS_IO)
550 if( strlen( opt.crt_file ) )
551 ret = mbedtls_x509_crt_parse_file( &clicert, opt.crt_file );
554 #if defined(MBEDTLS_CERTS_C)
555 ret = mbedtls_x509_crt_parse( &clicert, (const unsigned char *) mbedtls_test_cli_crt,
556 mbedtls_test_cli_crt_len );
559 mbedtls_printf("MBEDTLS_CERTS_C not defined.");
565 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse returned %d\n\n", ret );
569 #if defined(MBEDTLS_FS_IO)
570 if( strlen( opt.key_file ) )
571 ret = mbedtls_pk_parse_keyfile( &pkey, opt.key_file, "" );
574 #if defined(MBEDTLS_CERTS_C) && defined(MBEDTLS_PEM_PARSE_C)
575 ret = mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_cli_key,
576 mbedtls_test_cli_key_len, NULL, 0 );
579 mbedtls_printf("MBEDTLS_CERTS_C or MBEDTLS_PEM_PARSE_C not defined.");
585 mbedtls_printf( " failed\n ! mbedtls_pk_parse_key returned %d\n\n", ret );
589 mbedtls_printf( " ok\n" );
592 * 2. Start the connection
594 mbedtls_printf( " . Connecting to tcp/%s/%s...", opt.server_name,
598 if( ( ret = mbedtls_net_connect( &server_fd, opt.server_name,
599 opt.server_port, MBEDTLS_NET_PROTO_TCP ) ) != 0 )
601 mbedtls_printf( " failed\n ! mbedtls_net_connect returned %d\n\n", ret );
605 mbedtls_printf( " ok\n" );
610 mbedtls_printf( " . Setting up the SSL/TLS structure..." );
613 if( ( ret = mbedtls_ssl_config_defaults( &conf,
614 MBEDTLS_SSL_IS_CLIENT,
615 MBEDTLS_SSL_TRANSPORT_STREAM,
616 MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
618 mbedtls_printf( " failed\n ! mbedtls_ssl_config_defaults returned %d\n\n", ret );
622 /* OPTIONAL is not optimal for security,
623 * but makes interop easier in this simplified example */
624 mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_OPTIONAL );
626 mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
627 mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
629 if( opt.force_ciphersuite[0] != DFL_FORCE_CIPHER )
630 mbedtls_ssl_conf_ciphersuites( &conf, opt.force_ciphersuite );
632 mbedtls_ssl_conf_ca_chain( &conf, &cacert, NULL );
633 if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &clicert, &pkey ) ) != 0 )
635 mbedtls_printf( " failed\n ! mbedtls_ssl_conf_own_cert returned %d\n\n", ret );
639 if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
641 mbedtls_printf( " failed\n ! mbedtls_ssl_setup returned %d\n\n", ret );
645 if( ( ret = mbedtls_ssl_set_hostname( &ssl, opt.server_name ) ) != 0 )
647 mbedtls_printf( " failed\n ! mbedtls_ssl_set_hostname returned %d\n\n", ret );
651 mbedtls_ssl_set_bio( &ssl, &server_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
653 mbedtls_printf( " ok\n" );
655 if( opt.mode == MODE_SSL_TLS )
657 if( do_handshake( &ssl ) != 0 )
660 mbedtls_printf( " > Get header from server:" );
663 ret = write_ssl_and_get_response( &ssl, buf, 0 );
664 if( ret < 200 || ret > 299 )
666 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
670 mbedtls_printf(" ok\n" );
672 mbedtls_printf( " > Write EHLO to server:" );
675 gethostname( hostname, 32 );
676 len = sprintf( (char *) buf, "EHLO %s\r\n", hostname );
677 ret = write_ssl_and_get_response( &ssl, buf, len );
678 if( ret < 200 || ret > 299 )
680 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
686 mbedtls_printf( " > Get header from server:" );
689 ret = write_and_get_response( &server_fd, buf, 0 );
690 if( ret < 200 || ret > 299 )
692 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
696 mbedtls_printf(" ok\n" );
698 mbedtls_printf( " > Write EHLO to server:" );
701 gethostname( hostname, 32 );
702 len = sprintf( (char *) buf, "EHLO %s\r\n", hostname );
703 ret = write_and_get_response( &server_fd, buf, len );
704 if( ret < 200 || ret > 299 )
706 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
710 mbedtls_printf(" ok\n" );
712 mbedtls_printf( " > Write STARTTLS to server:" );
715 gethostname( hostname, 32 );
716 len = sprintf( (char *) buf, "STARTTLS\r\n" );
717 ret = write_and_get_response( &server_fd, buf, len );
718 if( ret < 200 || ret > 299 )
720 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
724 mbedtls_printf(" ok\n" );
726 if( do_handshake( &ssl ) != 0 )
730 #if defined(MBEDTLS_BASE64_C)
731 if( opt.authentication )
733 mbedtls_printf( " > Write AUTH LOGIN to server:" );
736 len = sprintf( (char *) buf, "AUTH LOGIN\r\n" );
737 ret = write_ssl_and_get_response( &ssl, buf, len );
738 if( ret < 200 || ret > 399 )
740 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
744 mbedtls_printf(" ok\n" );
746 mbedtls_printf( " > Write username to server: %s", opt.user_name );
749 ret = mbedtls_base64_encode( base, sizeof( base ), &n, (const unsigned char *) opt.user_name,
750 strlen( opt.user_name ) );
753 mbedtls_printf( " failed\n ! mbedtls_base64_encode returned %d\n\n", ret );
756 len = sprintf( (char *) buf, "%s\r\n", base );
757 ret = write_ssl_and_get_response( &ssl, buf, len );
758 if( ret < 300 || ret > 399 )
760 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
764 mbedtls_printf(" ok\n" );
766 mbedtls_printf( " > Write password to server: %s", opt.user_pwd );
769 ret = mbedtls_base64_encode( base, sizeof( base ), &n, (const unsigned char *) opt.user_pwd,
770 strlen( opt.user_pwd ) );
773 mbedtls_printf( " failed\n ! mbedtls_base64_encode returned %d\n\n", ret );
776 len = sprintf( (char *) buf, "%s\r\n", base );
777 ret = write_ssl_and_get_response( &ssl, buf, len );
778 if( ret < 200 || ret > 399 )
780 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
784 mbedtls_printf(" ok\n" );
788 mbedtls_printf( " > Write MAIL FROM to server:" );
791 len = sprintf( (char *) buf, "MAIL FROM:<%s>\r\n", opt.mail_from );
792 ret = write_ssl_and_get_response( &ssl, buf, len );
793 if( ret < 200 || ret > 299 )
795 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
799 mbedtls_printf(" ok\n" );
801 mbedtls_printf( " > Write RCPT TO to server:" );
804 len = sprintf( (char *) buf, "RCPT TO:<%s>\r\n", opt.mail_to );
805 ret = write_ssl_and_get_response( &ssl, buf, len );
806 if( ret < 200 || ret > 299 )
808 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
812 mbedtls_printf(" ok\n" );
814 mbedtls_printf( " > Write DATA to server:" );
817 len = sprintf( (char *) buf, "DATA\r\n" );
818 ret = write_ssl_and_get_response( &ssl, buf, len );
819 if( ret < 300 || ret > 399 )
821 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
825 mbedtls_printf(" ok\n" );
827 mbedtls_printf( " > Write content to server:" );
830 len = sprintf( (char *) buf, "From: %s\r\nSubject: mbed TLS Test mail\r\n\r\n"
831 "This is a simple test mail from the "
832 "mbed TLS mail client example.\r\n"
834 "Enjoy!", opt.mail_from );
835 ret = write_ssl_data( &ssl, buf, len );
837 len = sprintf( (char *) buf, "\r\n.\r\n");
838 ret = write_ssl_and_get_response( &ssl, buf, len );
839 if( ret < 200 || ret > 299 )
841 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
845 mbedtls_printf(" ok\n" );
847 mbedtls_ssl_close_notify( &ssl );
849 exit_code = MBEDTLS_EXIT_SUCCESS;
853 mbedtls_net_free( &server_fd );
854 mbedtls_x509_crt_free( &clicert );
855 mbedtls_x509_crt_free( &cacert );
856 mbedtls_pk_free( &pkey );
857 mbedtls_ssl_free( &ssl );
858 mbedtls_ssl_config_free( &conf );
859 mbedtls_ctr_drbg_free( &ctr_drbg );
860 mbedtls_entropy_free( &entropy );
863 mbedtls_printf( " + Press Enter to exit this program.\n" );
864 fflush( stdout ); getchar();
869 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_SSL_TLS_C &&
870 MBEDTLS_SSL_CLI_C && MBEDTLS_NET_C && MBEDTLS_RSA_C **
871 MBEDTLS_CTR_DRBG_C */