diff options
Diffstat (limited to 'lib/mbedtls-2.27.0/programs/ssl/dtls_client.c')
| -rw-r--r-- | lib/mbedtls-2.27.0/programs/ssl/dtls_client.c | 363 |
1 files changed, 363 insertions, 0 deletions
diff --git a/lib/mbedtls-2.27.0/programs/ssl/dtls_client.c b/lib/mbedtls-2.27.0/programs/ssl/dtls_client.c new file mode 100644 index 0000000..8c302a0 --- /dev/null +++ b/lib/mbedtls-2.27.0/programs/ssl/dtls_client.c @@ -0,0 +1,363 @@ +/* + * Simple DTLS client demonstration program + * + * 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. + */ + +#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 <stdio.h> +#include <stdlib.h> +#define mbedtls_printf printf +#define mbedtls_fprintf fprintf +#define mbedtls_exit exit +#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS +#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE +#endif + +#if !defined(MBEDTLS_SSL_CLI_C) || !defined(MBEDTLS_SSL_PROTO_DTLS) || \ + !defined(MBEDTLS_NET_C) || !defined(MBEDTLS_TIMING_C) || \ + !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_CTR_DRBG_C) || \ + !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_RSA_C) || \ + !defined(MBEDTLS_CERTS_C) || !defined(MBEDTLS_PEM_PARSE_C) +int main( void ) +{ + mbedtls_printf( "MBEDTLS_SSL_CLI_C and/or MBEDTLS_SSL_PROTO_DTLS and/or " + "MBEDTLS_NET_C and/or MBEDTLS_TIMING_C and/or " + "MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C and/or " + "MBEDTLS_X509_CRT_PARSE_C and/or MBEDTLS_RSA_C and/or " + "MBEDTLS_CERTS_C and/or MBEDTLS_PEM_PARSE_C not defined.\n" ); + mbedtls_exit( 0 ); +} +#else + +#include <string.h> + +#include "mbedtls/net_sockets.h" +#include "mbedtls/debug.h" +#include "mbedtls/ssl.h" +#include "mbedtls/entropy.h" +#include "mbedtls/ctr_drbg.h" +#include "mbedtls/error.h" +#include "mbedtls/certs.h" +#include "mbedtls/timing.h" + +/* Uncomment out the following line to default to IPv4 and disable IPv6 */ +//#define FORCE_IPV4 + +#define SERVER_PORT "4433" +#define SERVER_NAME "localhost" + +#ifdef FORCE_IPV4 +#define SERVER_ADDR "127.0.0.1" /* Forces IPv4 */ +#else +#define SERVER_ADDR "::1" +#endif + +#define MESSAGE "Echo this" + +#define READ_TIMEOUT_MS 1000 +#define MAX_RETRY 5 + +#define DEBUG_LEVEL 0 + + +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 ); +} + +int main( int argc, char *argv[] ) +{ + int ret, len; + mbedtls_net_context server_fd; + uint32_t flags; + unsigned char buf[1024]; + const char *pers = "dtls_client"; + int retry_left = MAX_RETRY; + + mbedtls_entropy_context entropy; + mbedtls_ctr_drbg_context ctr_drbg; + mbedtls_ssl_context ssl; + mbedtls_ssl_config conf; + mbedtls_x509_crt cacert; + mbedtls_timing_delay_context timer; + + ((void) argc); + ((void) argv); + +#if defined(MBEDTLS_DEBUG_C) + mbedtls_debug_set_threshold( DEBUG_LEVEL ); +#endif + + /* + * 0. Initialize the RNG and the session data + */ + mbedtls_net_init( &server_fd ); + mbedtls_ssl_init( &ssl ); + mbedtls_ssl_config_init( &conf ); + mbedtls_x509_crt_init( &cacert ); + mbedtls_ctr_drbg_init( &ctr_drbg ); + + 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" ); + + /* + * 0. Load certificates + */ + mbedtls_printf( " . Loading the CA root certificate ..." ); + fflush( stdout ); + + ret = mbedtls_x509_crt_parse( &cacert, (const unsigned char *) mbedtls_test_cas_pem, + mbedtls_test_cas_pem_len ); + 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. Start the connection + */ + mbedtls_printf( " . Connecting to udp/%s/%s...", SERVER_NAME, SERVER_PORT ); + fflush( stdout ); + + if( ( ret = mbedtls_net_connect( &server_fd, SERVER_ADDR, + SERVER_PORT, MBEDTLS_NET_PROTO_UDP ) ) != 0 ) + { + mbedtls_printf( " failed\n ! mbedtls_net_connect returned %d\n\n", ret ); + goto exit; + } + + mbedtls_printf( " ok\n" ); + + /* + * 2. Setup stuff + */ + mbedtls_printf( " . Setting up the DTLS structure..." ); + fflush( stdout ); + + if( ( ret = mbedtls_ssl_config_defaults( &conf, + MBEDTLS_SSL_IS_CLIENT, + MBEDTLS_SSL_TRANSPORT_DATAGRAM, + MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 ) + { + mbedtls_printf( " failed\n ! mbedtls_ssl_config_defaults returned %d\n\n", ret ); + goto exit; + } + + /* OPTIONAL is usually a bad choice for security, but makes interop easier + * in this simplified example, in which the ca chain is hardcoded. + * Production code should set a proper ca chain and use REQUIRED. */ + mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_OPTIONAL ); + mbedtls_ssl_conf_ca_chain( &conf, &cacert, NULL ); + 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, READ_TIMEOUT_MS ); + + 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, 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, mbedtls_net_recv_timeout ); + + mbedtls_ssl_set_timer_cb( &ssl, &timer, mbedtls_timing_set_delay, + mbedtls_timing_get_delay ); + + mbedtls_printf( " ok\n" ); + + /* + * 4. Handshake + */ + mbedtls_printf( " . Performing the DTLS handshake..." ); + fflush( stdout ); + + do ret = mbedtls_ssl_handshake( &ssl ); + while( ret == MBEDTLS_ERR_SSL_WANT_READ || + ret == MBEDTLS_ERR_SSL_WANT_WRITE ); + + if( ret != 0 ) + { + mbedtls_printf( " failed\n ! mbedtls_ssl_handshake returned -0x%x\n\n", (unsigned int) -ret ); + goto exit; + } + + mbedtls_printf( " ok\n" ); + + /* + * 5. Verify the server certificate + */ + mbedtls_printf( " . Verifying peer X.509 certificate..." ); + + /* In real life, we would have used MBEDTLS_SSL_VERIFY_REQUIRED so that the + * handshake would not succeed if the peer's cert is bad. Even if we used + * MBEDTLS_SSL_VERIFY_OPTIONAL, we would bail out here if 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" ); + + /* + * 6. Write the echo request + */ +send_request: + mbedtls_printf( " > Write to server:" ); + fflush( stdout ); + + len = sizeof( MESSAGE ) - 1; + + do ret = mbedtls_ssl_write( &ssl, (unsigned char *) MESSAGE, len ); + while( ret == MBEDTLS_ERR_SSL_WANT_READ || + ret == MBEDTLS_ERR_SSL_WANT_WRITE ); + + if( ret < 0 ) + { + mbedtls_printf( " failed\n ! mbedtls_ssl_write returned %d\n\n", ret ); + goto exit; + } + + len = ret; + mbedtls_printf( " %d bytes written\n\n%s\n\n", len, MESSAGE ); + + /* + * 7. Read the echo response + */ + mbedtls_printf( " < Read from server:" ); + fflush( stdout ); + + len = sizeof( buf ) - 1; + memset( buf, 0, sizeof( buf ) ); + + do ret = mbedtls_ssl_read( &ssl, buf, len ); + while( ret == MBEDTLS_ERR_SSL_WANT_READ || + ret == MBEDTLS_ERR_SSL_WANT_WRITE ); + + if( ret <= 0 ) + { + switch( ret ) + { + case MBEDTLS_ERR_SSL_TIMEOUT: + mbedtls_printf( " timeout\n\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\n", (unsigned int) -ret ); + goto exit; + } + } + + len = ret; + mbedtls_printf( " %d bytes read\n\n%s\n\n", len, buf ); + + /* + * 8. Done, cleanly close the connection + */ +close_notify: + mbedtls_printf( " . Closing the connection..." ); + + /* 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. Final clean-ups 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: %d - %s\n\n", ret, error_buf ); + } +#endif + + mbedtls_net_free( &server_fd ); + + mbedtls_x509_crt_free( &cacert ); + 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 + + /* Shell can not handle large exit numbers -> 1 for errors */ + if( ret < 0 ) + ret = 1; + + mbedtls_exit( ret ); +} +#endif /* MBEDTLS_SSL_CLI_C && MBEDTLS_SSL_PROTO_DTLS && MBEDTLS_NET_C && + MBEDTLD_TIMING_C && MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C && + MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_RSA_C && MBEDTLS_CERTS_C && + MBEDTLS_PEM_PARSE_C */ |