void
comm_base_dispatch(struct comm_base* b)
{
struct replay_runtime* runtime = (struct replay_runtime*)b;
run_scenario(runtime);
if(runtime->sig_cb)
(*runtime->sig_cb)(SIGTERM, runtime->sig_cb_arg);
else exit(0); /* OK exit when LIBEVENT_SIGNAL_PROBLEM exists */
}
int main(int argc, char *argv[]) {
int ret, exitcode;
mbedtls_net_context server_fd;
uint32_t flags;
char scenario[10000] = "";
char server_host[100] = "";
char server_port[6] = "";
char server_ssl_hostname[100] = "";
const char *pers = "dtls_client";
int opt;
struct timeval t0, t1;
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;
/* Parse command line */
while ((opt = getopt(argc, argv, "h:n:p:s:")) != -1) {
switch (opt) {
case 'h':
strncpy(server_host, optarg, sizeof(server_host));
break;
case 'n':
strncpy(server_ssl_hostname, optarg, sizeof(server_ssl_hostname));
break;
case 'p':
strncpy(server_port, optarg, sizeof(server_port));
break;
case 's':
strncpy(scenario, optarg, sizeof(scenario));
break;
default: /* '?' */
print_usage(argv[0]);
}
}
if (!(scenario[0] && server_port[0] && server_host[0])) {
print_usage(argv[0]);
}
if (!server_ssl_hostname[0]) {
strncpy(server_ssl_hostname, server_host, sizeof(server_ssl_hostname));
}
#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);
plog("Seeding the random number generator...");
mbedtls_entropy_init(&entropy);
if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy,
(const unsigned char *)pers, strlen(pers))) != 0) {
plog("ERROR: failed! mbedtls_ctr_drbg_seed returned %d", ret);
goto exit;
}
/*
* 0. Load certificates
*/
plog("Loading the CA root certificate ...");
ret = mbedtls_x509_crt_parse(&cacert, (const unsigned char *)mbedtls_test_cas_pem,
mbedtls_test_cas_pem_len);
if (ret < 0) {
plog("ERROR: failed! mbedtls_x509_crt_parse returned -0x%x", -ret);
goto exit;
}
plog("Connecting to udp %s:%s (SSL hostname: %s)...",
server_host, server_port, server_ssl_hostname);
if ((ret = mbedtls_net_connect(&server_fd, server_host, server_port, MBEDTLS_NET_PROTO_UDP)) != 0) {
plog("ERROR: failed! mbedtls_net_connect returned %d", ret);
goto exit;
}
plog("The local client UDP source port is %d", get_source_port(server_fd.fd));
plog("Setting up the DTLS structure...");
if ((ret = mbedtls_ssl_config_defaults(&conf,
MBEDTLS_SSL_IS_CLIENT,
MBEDTLS_SSL_TRANSPORT_DATAGRAM,
MBEDTLS_SSL_PRESET_DEFAULT)) != 0) {
plog("ERROR: failed! mbedtls_ssl_config_defaults returned %d", 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, log_mbedtls_debug_callback, NULL);
/* TODO timeouts */
if ((ret = mbedtls_ssl_setup(&ssl, &conf)) != 0) {
plog("ERROR: failed! mbedtls_ssl_setup returned %d", ret);
goto exit;
}
if ((ret = mbedtls_ssl_set_hostname(&ssl, server_ssl_hostname)) != 0) {
plog("ERROR: failed! mbedtls_ssl_set_hostname returned %d", 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);
plog("Performing the SSL/TLS handshake...");
gettimeofday(&t0, NULL);
do {
ret = mbedtls_ssl_handshake(&ssl);
plog(" ... during SSL handshake, ret=%d (WANT_READ=%d, WANT_WRITE=%d, RECV_FAILED=%d",
ret, MBEDTLS_ERR_SSL_WANT_READ, MBEDTLS_ERR_SSL_WANT_WRITE, MBEDTLS_ERR_NET_RECV_FAILED);
gettimeofday(&t1, NULL);
} while ((duration_ms(&t1, &t0) <= SSL_HANDSHAKE_TIMEOUT_MILLISECS) &&
(ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE));
plog("handshake duration: %d milliseconds", duration_ms(&t1, &t0));
if (duration_ms(&t1, &t0) > SSL_HANDSHAKE_TIMEOUT_MILLISECS) {
plog("ERROR: long time to perform handshake: %d milliseconds", duration_ms(&t1, &t0));
ret = MBEDTLS_ERR_SSL_TIMEOUT;
goto exit;
}
if (ret != 0) {
plog("ERROR: failed! mbedtls_ssl_handshake returned -0x%x", -ret);
goto exit;
}
plog("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_x509_crt_verify_info(vrfy_buf, sizeof(vrfy_buf), "! ", flags);
plog("Verification failed: %s", vrfy_buf);
} else {
plog("Certificates ok");
}
ret = run_scenario(scenario, &ssl);
if (ret != 0) {
goto exit;
}
plog("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;
exit:
#ifdef MBEDTLS_ERROR_C
if (ret != 0) {
char error_buf[100];
mbedtls_strerror(ret, error_buf, 100);
plog("ERROR: Last error was: %d - %s", 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);
exitcode = ret == 0 ? 0 : 1;
plog("Done, exitcode=%d", exitcode);
return exitcode;
}
