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mbedtls/programs/ssl/dtls_client.c
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Ben Taylor fe978ac1f3 Remove Deprecated Items From Sample Programs 
Remove the drbg module and entropy functions from the sample programs as these are
now handled by their PSA equivalents

Signed-off-by: Ben Taylor <[email protected]>
2026-01-14 13:01:22 +00:00

318 lines
8.6 KiB
C
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/*
* Simple DTLS client demonstration program
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
#include "mbedtls/build_info.h"
#include "mbedtls/platform.h"
#if !defined(MBEDTLS_NET_C) || !defined(MBEDTLS_SSL_CLI_C) || \
!defined(MBEDTLS_TIMING_C) || !defined(MBEDTLS_SSL_PROTO_DTLS) || \
!defined(MBEDTLS_PEM_PARSE_C) || !defined(MBEDTLS_X509_CRT_PARSE_C)
int main(void)
{
mbedtls_printf("MBEDTLS_NET_C and/or MBEDTLS_SSL_CLI_C and/or "
"MBEDTLS_TIMING_C and/or MBEDTLS_SSL_PROTO_DTLS and/or "
"MBEDTLS_PEM_PARSE_C and/or MBEDTLS_X509_CRT_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/error.h"
#include "mbedtls/timing.h"
#include "test/certs.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 SERVER_NAME
#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];
int retry_left = MAX_RETRY;
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);
psa_status_t 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;
}
mbedtls_printf("\n . Seeding the random number generator...");
fflush(stdout);
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_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) {
#if !defined(MBEDTLS_X509_REMOVE_INFO)
char vrfy_buf[512];
#endif
mbedtls_printf(" failed\n");
#if !defined(MBEDTLS_X509_REMOVE_INFO)
mbedtls_x509_crt_verify_info(vrfy_buf, sizeof(vrfy_buf), " ! ", flags);
mbedtls_printf("%s\n", vrfy_buf);
#endif
} 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");
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_psa_crypto_free();
/* Shell can not handle large exit numbers -> 1 for errors */
if (ret < 0) {
ret = 1;
}
mbedtls_exit(ret);
}
#endif /* configuration allows running this program */
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