/* * SSL client for SMTP servers * * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved * 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. * * This file is part of mbed TLS (https://tls.mbed.org) */ /* Enable definition of gethostname() even when compiling with -std=c99. Must * be set before config.h, which pulls in glibc's features.h indirectly. * Harmless on other platforms. */ #define _POSIX_C_SOURCE 200112L #if !defined(MBEDTLS_CONFIG_FILE) #include "mbedtls/config.h" #else #include MBEDTLS_CONFIG_FILE #endif #if defined(MBEDTLS_PLATFORM_C) #include "mbedtls/platform.h" #else #include #include #define mbedtls_time time #define mbedtls_time_t time_t #define mbedtls_fprintf fprintf #define mbedtls_printf printf #define mbedtls_exit exit #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE #endif /* MBEDTLS_PLATFORM_C */ #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \ !defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_CLI_C) || \ !defined(MBEDTLS_NET_C) || !defined(MBEDTLS_RSA_C) || \ !defined(MBEDTLS_CTR_DRBG_C) || !defined(MBEDTLS_X509_CRT_PARSE_C) || \ !defined(MBEDTLS_FS_IO) int main( void ) { mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or " "MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_CLI_C and/or " "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or " "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C " "not defined.\n"); return( 0 ); } #else #include "mbedtls/base64.h" #include "mbedtls/error.h" #include "mbedtls/net_sockets.h" #include "mbedtls/ssl.h" #include "mbedtls/entropy.h" #include "mbedtls/ctr_drbg.h" #include "mbedtls/certs.h" #include "mbedtls/x509.h" #include #include #if !defined(_MSC_VER) || defined(EFIX64) || defined(EFI32) #include #else #include #endif #if defined(_WIN32) || defined(_WIN32_WCE) #include #include #if defined(_MSC_VER) #if defined(_WIN32_WCE) #pragma comment( lib, "ws2.lib" ) #else #pragma comment( lib, "ws2_32.lib" ) #endif #endif /* _MSC_VER */ #endif #define DFL_SERVER_NAME "localhost" #define DFL_SERVER_PORT "465" #define DFL_USER_NAME "user" #define DFL_USER_PWD "password" #define DFL_MAIL_FROM "" #define DFL_MAIL_TO "" #define DFL_DEBUG_LEVEL 0 #define DFL_CA_FILE "" #define DFL_CRT_FILE "" #define DFL_KEY_FILE "" #define DFL_FORCE_CIPHER 0 #define DFL_MODE 0 #define DFL_AUTHENTICATION 0 #define MODE_SSL_TLS 0 #define MODE_STARTTLS 0 #if defined(MBEDTLS_BASE64_C) #define USAGE_AUTH \ " authentication=%%d default: 0 (disabled)\n" \ " user_name=%%s default: \"" DFL_USER_NAME "\"\n" \ " user_pwd=%%s default: \"" DFL_USER_PWD "\"\n" #else #define USAGE_AUTH \ " authentication options disabled. (Require MBEDTLS_BASE64_C)\n" #endif /* MBEDTLS_BASE64_C */ #if defined(MBEDTLS_FS_IO) #define USAGE_IO \ " ca_file=%%s default: \"\" (pre-loaded)\n" \ " crt_file=%%s default: \"\" (pre-loaded)\n" \ " key_file=%%s default: \"\" (pre-loaded)\n" #else #define USAGE_IO \ " No file operations available (MBEDTLS_FS_IO not defined)\n" #endif /* MBEDTLS_FS_IO */ #define USAGE \ "\n usage: ssl_mail_client param=<>...\n" \ "\n acceptable parameters:\n" \ " server_name=%%s default: " DFL_SERVER_NAME "\n" \ " server_port=%%d default: " DFL_SERVER_PORT "\n" \ " debug_level=%%d default: 0 (disabled)\n" \ " mode=%%d default: 0 (SSL/TLS) (1 for STARTTLS)\n" \ USAGE_AUTH \ " mail_from=%%s default: \"\"\n" \ " mail_to=%%s default: \"\"\n" \ USAGE_IO \ " force_ciphersuite= default: all enabled\n" \ " acceptable ciphersuite names:\n" /* * global options */ struct options { const char *server_name; /* hostname of the server (client only) */ const char *server_port; /* port on which the ssl service runs */ int debug_level; /* level of debugging */ int authentication; /* if authentication is required */ int mode; /* SSL/TLS (0) or STARTTLS (1) */ const char *user_name; /* username to use for authentication */ const char *user_pwd; /* password to use for authentication */ const char *mail_from; /* E-Mail address to use as sender */ const char *mail_to; /* E-Mail address to use as recipient */ const char *ca_file; /* the file with the CA certificate(s) */ const char *crt_file; /* the file with the client certificate */ const char *key_file; /* the file with the client key */ int force_ciphersuite[2]; /* protocol/ciphersuite to use, or all */ } opt; static void my_debug( void *ctx, int level, const char *file, int line, const char *str ) { ((void) level); mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str ); fflush( (FILE *) ctx ); } static int do_handshake( mbedtls_ssl_context *ssl ) { int ret; uint32_t flags; unsigned char buf[1024]; memset(buf, 0, 1024); /* * 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 ) { #if defined(MBEDTLS_ERROR_C) mbedtls_strerror( ret, (char *) buf, 1024 ); #endif mbedtls_printf( " failed\n ! mbedtls_ssl_handshake returned %d: %s\n\n", ret, buf ); return( -1 ); } } mbedtls_printf( " ok\n [ Ciphersuite is %s ]\n", mbedtls_ssl_get_ciphersuite( ssl ) ); /* * 5. Verify the server certificate */ mbedtls_printf( " . Verifying peer X.509 certificate..." ); /* In real life, we probably want to bail out when ret != 0 */ 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_x509_crt_info( (char *) buf, sizeof( buf ) - 1, " ", mbedtls_ssl_get_peer_cert( ssl ) ); mbedtls_printf( "%s\n", buf ); return( 0 ); } static int write_ssl_data( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len ) { int ret; mbedtls_printf("\n%s", buf); while( len && ( ret = mbedtls_ssl_write( ssl, buf, len ) ) <= 0 ) { if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE ) { mbedtls_printf( " failed\n ! mbedtls_ssl_write returned %d\n\n", ret ); return -1; } } return( 0 ); } static int write_ssl_and_get_response( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len ) { int ret; unsigned char data[128]; char code[4]; size_t i, idx = 0; mbedtls_printf("\n%s", buf); while( len && ( ret = mbedtls_ssl_write( ssl, buf, len ) ) <= 0 ) { if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE ) { mbedtls_printf( " failed\n ! mbedtls_ssl_write returned %d\n\n", ret ); return -1; } } do { len = sizeof( data ) - 1; memset( data, 0, sizeof( data ) ); ret = mbedtls_ssl_read( ssl, data, len ); if( ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE ) continue; if( ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY ) return -1; if( ret <= 0 ) { mbedtls_printf( "failed\n ! mbedtls_ssl_read returned %d\n\n", ret ); return -1; } mbedtls_printf("\n%s", data); len = ret; for( i = 0; i < len; i++ ) { if( data[i] != '\n' ) { if( idx < 4 ) code[ idx++ ] = data[i]; continue; } if( idx == 4 && code[0] >= '0' && code[0] <= '9' && code[3] == ' ' ) { code[3] = '\0'; return atoi( code ); } idx = 0; } } while( 1 ); } static int write_and_get_response( mbedtls_net_context *sock_fd, unsigned char *buf, size_t len ) { int ret; unsigned char data[128]; char code[4]; size_t i, idx = 0; mbedtls_printf("\n%s", buf); if( len && ( ret = mbedtls_net_send( sock_fd, buf, len ) ) <= 0 ) { mbedtls_printf( " failed\n ! mbedtls_net_send returned %d\n\n", ret ); return -1; } do { len = sizeof( data ) - 1; memset( data, 0, sizeof( data ) ); ret = mbedtls_net_recv( sock_fd, data, len ); if( ret <= 0 ) { mbedtls_printf( "failed\n ! mbedtls_net_recv returned %d\n\n", ret ); return -1; } data[len] = '\0'; mbedtls_printf("\n%s", data); len = ret; for( i = 0; i < len; i++ ) { if( data[i] != '\n' ) { if( idx < 4 ) code[ idx++ ] = data[i]; continue; } if( idx == 4 && code[0] >= '0' && code[0] <= '9' && code[3] == ' ' ) { code[3] = '\0'; return atoi( code ); } idx = 0; } } while( 1 ); } int main( int argc, char *argv[] ) { int ret = 1, len; int exit_code = MBEDTLS_EXIT_FAILURE; mbedtls_net_context server_fd; #if defined(MBEDTLS_BASE64_C) unsigned char base[1024]; /* buf is used as the destination buffer for printing base with the format: * "%s\r\n". Hence, the size of buf should be at least the size of base * plus 2 bytes for the \r and \n characters. */ unsigned char buf[sizeof( base ) + 2]; #else unsigned char buf[1024]; #endif char hostname[32]; const char *pers = "ssl_mail_client"; mbedtls_entropy_context entropy; mbedtls_ctr_drbg_context ctr_drbg; mbedtls_ssl_context ssl; mbedtls_ssl_config conf; mbedtls_x509_crt cacert; mbedtls_x509_crt clicert; mbedtls_pk_context pkey; int i; size_t n; char *p, *q; const int *list; /* * Make sure memory references are valid in case we exit early. */ mbedtls_net_init( &server_fd ); mbedtls_ssl_init( &ssl ); mbedtls_ssl_config_init( &conf ); memset( &buf, 0, sizeof( buf ) ); mbedtls_x509_crt_init( &cacert ); mbedtls_x509_crt_init( &clicert ); mbedtls_pk_init( &pkey ); mbedtls_ctr_drbg_init( &ctr_drbg ); if( argc == 0 ) { usage: mbedtls_printf( USAGE ); list = mbedtls_ssl_list_ciphersuites(); while( *list ) { mbedtls_printf(" %s\n", mbedtls_ssl_get_ciphersuite_name( *list ) ); list++; } mbedtls_printf("\n"); goto exit; } opt.server_name = DFL_SERVER_NAME; opt.server_port = DFL_SERVER_PORT; opt.debug_level = DFL_DEBUG_LEVEL; opt.authentication = DFL_AUTHENTICATION; opt.mode = DFL_MODE; opt.user_name = DFL_USER_NAME; opt.user_pwd = DFL_USER_PWD; opt.mail_from = DFL_MAIL_FROM; opt.mail_to = DFL_MAIL_TO; opt.ca_file = DFL_CA_FILE; opt.crt_file = DFL_CRT_FILE; opt.key_file = DFL_KEY_FILE; opt.force_ciphersuite[0]= DFL_FORCE_CIPHER; 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_port" ) == 0 ) opt.server_port = q; 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, "authentication" ) == 0 ) { opt.authentication = atoi( q ); if( opt.authentication < 0 || opt.authentication > 1 ) goto usage; } else if( strcmp( p, "mode" ) == 0 ) { opt.mode = atoi( q ); if( opt.mode < 0 || opt.mode > 1 ) goto usage; } else if( strcmp( p, "user_name" ) == 0 ) opt.user_name = q; else if( strcmp( p, "user_pwd" ) == 0 ) opt.user_pwd = q; else if( strcmp( p, "mail_from" ) == 0 ) opt.mail_from = q; else if( strcmp( p, "mail_to" ) == 0 ) opt.mail_to = q; else if( strcmp( p, "ca_file" ) == 0 ) opt.ca_file = 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, "force_ciphersuite" ) == 0 ) { opt.force_ciphersuite[0] = -1; opt.force_ciphersuite[0] = mbedtls_ssl_get_ciphersuite_id( q ); if( opt.force_ciphersuite[0] <= 0 ) goto usage; opt.force_ciphersuite[1] = 0; } else goto usage; } /* * 0. Initialize the RNG and the session data */ mbedtls_printf( "\n . Seeding the random number generator..." ); fflush( stdout ); mbedtls_entropy_init( &entropy ); 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 %d\n", ret ); goto exit; } mbedtls_printf( " ok\n" ); /* * 1.1. Load the trusted CA */ mbedtls_printf( " . Loading the CA root certificate ..." ); fflush( stdout ); #if defined(MBEDTLS_FS_IO) if( strlen( opt.ca_file ) ) ret = mbedtls_x509_crt_parse_file( &cacert, opt.ca_file ); else #endif #if defined(MBEDTLS_CERTS_C) && defined(MBEDTLS_PEM_PARSE_C) ret = mbedtls_x509_crt_parse( &cacert, (const unsigned char *) mbedtls_test_cas_pem, mbedtls_test_cas_pem_len ); #else { mbedtls_printf("MBEDTLS_CERTS_C and/or MBEDTLS_PEM_PARSE_C not defined."); goto exit; } #endif if( ret < 0 ) { mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse returned %d\n\n", 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 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 { mbedtls_printf("MBEDTLS_CERTS_C not defined."); goto exit; } #endif if( ret != 0 ) { mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse returned %d\n\n", ret ); goto exit; } #if defined(MBEDTLS_FS_IO) if( strlen( opt.key_file ) ) ret = mbedtls_pk_parse_keyfile( &pkey, opt.key_file, "" ); else #endif #if defined(MBEDTLS_CERTS_C) && defined(MBEDTLS_PEM_PARSE_C) ret = mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_cli_key, mbedtls_test_cli_key_len, NULL, 0 ); #else { mbedtls_printf("MBEDTLS_CERTS_C or MBEDTLS_PEM_PARSE_C not defined."); goto exit; } #endif if( ret != 0 ) { mbedtls_printf( " failed\n ! mbedtls_pk_parse_key returned %d\n\n", ret ); goto exit; } mbedtls_printf( " ok\n" ); /* * 2. Start the connection */ mbedtls_printf( " . Connecting to tcp/%s/%s...", opt.server_name, opt.server_port ); fflush( stdout ); if( ( ret = mbedtls_net_connect( &server_fd, opt.server_name, opt.server_port, MBEDTLS_NET_PROTO_TCP ) ) != 0 ) { mbedtls_printf( " failed\n ! mbedtls_net_connect returned %d\n\n", 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, MBEDTLS_SSL_TRANSPORT_STREAM, MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 ) { mbedtls_printf( " failed\n ! mbedtls_ssl_config_defaults returned %d\n\n", ret ); goto exit; } /* OPTIONAL is not optimal for security, * but makes interop easier in this simplified example */ mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_OPTIONAL ); mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg ); mbedtls_ssl_conf_dbg( &conf, my_debug, stdout ); if( opt.force_ciphersuite[0] != DFL_FORCE_CIPHER ) mbedtls_ssl_conf_ciphersuites( &conf, opt.force_ciphersuite ); mbedtls_ssl_conf_ca_chain( &conf, &cacert, NULL ); 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; } if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 ) { mbedtls_printf( " failed\n ! mbedtls_ssl_setup returned %d\n\n", ret ); goto exit; } 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; } mbedtls_ssl_set_bio( &ssl, &server_fd, mbedtls_net_send, mbedtls_net_recv, NULL ); mbedtls_printf( " ok\n" ); if( opt.mode == MODE_SSL_TLS ) { if( do_handshake( &ssl ) != 0 ) goto exit; mbedtls_printf( " > Get header from server:" ); fflush( stdout ); ret = write_ssl_and_get_response( &ssl, buf, 0 ); if( ret < 200 || ret > 299 ) { mbedtls_printf( " failed\n ! server responded with %d\n\n", ret ); goto exit; } mbedtls_printf(" ok\n" ); mbedtls_printf( " > Write EHLO to server:" ); fflush( stdout ); gethostname( hostname, 32 ); len = sprintf( (char *) buf, "EHLO %s\r\n", hostname ); ret = write_ssl_and_get_response( &ssl, buf, len ); if( ret < 200 || ret > 299 ) { mbedtls_printf( " failed\n ! server responded with %d\n\n", ret ); goto exit; } } else { mbedtls_printf( " > Get header from server:" ); fflush( stdout ); ret = write_and_get_response( &server_fd, buf, 0 ); if( ret < 200 || ret > 299 ) { mbedtls_printf( " failed\n ! server responded with %d\n\n", ret ); goto exit; } mbedtls_printf(" ok\n" ); mbedtls_printf( " > Write EHLO to server:" ); fflush( stdout ); gethostname( hostname, 32 ); len = sprintf( (char *) buf, "EHLO %s\r\n", hostname ); ret = write_and_get_response( &server_fd, buf, len ); if( ret < 200 || ret > 299 ) { mbedtls_printf( " failed\n ! server responded with %d\n\n", ret ); goto exit; } mbedtls_printf(" ok\n" ); mbedtls_printf( " > Write STARTTLS to server:" ); fflush( stdout ); gethostname( hostname, 32 ); len = sprintf( (char *) buf, "STARTTLS\r\n" ); ret = write_and_get_response( &server_fd, buf, len ); if( ret < 200 || ret > 299 ) { mbedtls_printf( " failed\n ! server responded with %d\n\n", ret ); goto exit; } mbedtls_printf(" ok\n" ); if( do_handshake( &ssl ) != 0 ) goto exit; } #if defined(MBEDTLS_BASE64_C) if( opt.authentication ) { mbedtls_printf( " > Write AUTH LOGIN to server:" ); fflush( stdout ); len = sprintf( (char *) buf, "AUTH LOGIN\r\n" ); ret = write_ssl_and_get_response( &ssl, buf, len ); if( ret < 200 || ret > 399 ) { mbedtls_printf( " failed\n ! server responded with %d\n\n", ret ); goto exit; } mbedtls_printf(" ok\n" ); mbedtls_printf( " > Write username to server: %s", opt.user_name ); fflush( stdout ); ret = mbedtls_base64_encode( base, sizeof( base ), &n, (const unsigned char *) opt.user_name, strlen( opt.user_name ) ); if( ret != 0 ) { mbedtls_printf( " failed\n ! mbedtls_base64_encode returned %d\n\n", ret ); goto exit; } len = sprintf( (char *) buf, "%s\r\n", base ); ret = write_ssl_and_get_response( &ssl, buf, len ); if( ret < 300 || ret > 399 ) { mbedtls_printf( " failed\n ! server responded with %d\n\n", ret ); goto exit; } mbedtls_printf(" ok\n" ); mbedtls_printf( " > Write password to server: %s", opt.user_pwd ); fflush( stdout ); ret = mbedtls_base64_encode( base, sizeof( base ), &n, (const unsigned char *) opt.user_pwd, strlen( opt.user_pwd ) ); if( ret != 0 ) { mbedtls_printf( " failed\n ! mbedtls_base64_encode returned %d\n\n", ret ); goto exit; } len = sprintf( (char *) buf, "%s\r\n", base ); ret = write_ssl_and_get_response( &ssl, buf, len ); if( ret < 200 || ret > 399 ) { mbedtls_printf( " failed\n ! server responded with %d\n\n", ret ); goto exit; } mbedtls_printf(" ok\n" ); } #endif mbedtls_printf( " > Write MAIL FROM to server:" ); fflush( stdout ); len = sprintf( (char *) buf, "MAIL FROM:<%s>\r\n", opt.mail_from ); ret = write_ssl_and_get_response( &ssl, buf, len ); if( ret < 200 || ret > 299 ) { mbedtls_printf( " failed\n ! server responded with %d\n\n", ret ); goto exit; } mbedtls_printf(" ok\n" ); mbedtls_printf( " > Write RCPT TO to server:" ); fflush( stdout ); len = sprintf( (char *) buf, "RCPT TO:<%s>\r\n", opt.mail_to ); ret = write_ssl_and_get_response( &ssl, buf, len ); if( ret < 200 || ret > 299 ) { mbedtls_printf( " failed\n ! server responded with %d\n\n", ret ); goto exit; } mbedtls_printf(" ok\n" ); mbedtls_printf( " > Write DATA to server:" ); fflush( stdout ); len = sprintf( (char *) buf, "DATA\r\n" ); ret = write_ssl_and_get_response( &ssl, buf, len ); if( ret < 300 || ret > 399 ) { mbedtls_printf( " failed\n ! server responded with %d\n\n", ret ); goto exit; } mbedtls_printf(" ok\n" ); mbedtls_printf( " > Write content to server:" ); fflush( stdout ); len = sprintf( (char *) buf, "From: %s\r\nSubject: mbed TLS Test mail\r\n\r\n" "This is a simple test mail from the " "mbed TLS mail client example.\r\n" "\r\n" "Enjoy!", opt.mail_from ); ret = write_ssl_data( &ssl, buf, len ); len = sprintf( (char *) buf, "\r\n.\r\n"); ret = write_ssl_and_get_response( &ssl, buf, len ); if( ret < 200 || ret > 299 ) { mbedtls_printf( " failed\n ! server responded with %d\n\n", ret ); goto exit; } mbedtls_printf(" ok\n" ); mbedtls_ssl_close_notify( &ssl ); exit_code = MBEDTLS_EXIT_SUCCESS; exit: mbedtls_net_free( &server_fd ); mbedtls_x509_crt_free( &clicert ); mbedtls_x509_crt_free( &cacert ); mbedtls_pk_free( &pkey ); mbedtls_ssl_free( &ssl ); mbedtls_ssl_config_free( &conf ); mbedtls_ctr_drbg_free( &ctr_drbg ); mbedtls_entropy_free( &entropy ); #if defined(_WIN32) mbedtls_printf( " + Press Enter to exit this program.\n" ); fflush( stdout ); getchar(); #endif return( exit_code ); } #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_SSL_TLS_C && MBEDTLS_SSL_CLI_C && MBEDTLS_NET_C && MBEDTLS_RSA_C ** MBEDTLS_CTR_DRBG_C */