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coap_mbedtls.c: Handle mbedtls_ssl_write() not sending all the data for TLS

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Treat mbedtls_ssl_write() like any other send function that does not send
all the data and re-send the missing data.
This commit is contained in:
Jon Shallow authored and Jon Shallow committed 2022-11-30 11:26:23 +00:00
1 parent c9f40d7d09
commit a152ca7cdb
1 file changed
+29 -22
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src/coap_mbedtls.c
+29 -22
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@@ -2324,8 +2324,9 @@ ssize_t coap_tls_write(coap_session_t *c_session,
size_t data_len
)
{
int ret;
int ret = 0;
coap_mbedtls_env_t *m_env = (coap_mbedtls_env_t *)c_session->tls;
size_t amount_sent = 0;
assert(m_env != NULL);
@@ -2334,29 +2335,35 @@ ssize_t coap_tls_write(coap_session_t *c_session,
}
c_session->dtls_event = -1;
if (m_env->established) {
ret = mbedtls_ssl_write(&m_env->ssl, (const unsigned char*) data, data_len);
if (ret <= 0) {
switch (ret) {
case MBEDTLS_ERR_SSL_WANT_READ:
case MBEDTLS_ERR_SSL_WANT_WRITE:
ret = 0;
break;
case MBEDTLS_ERR_NET_CONN_RESET:
case MBEDTLS_ERR_SSL_FATAL_ALERT_MESSAGE:
c_session->dtls_event = COAP_EVENT_DTLS_CLOSED;
ret = -1;
break;
default:
coap_log(LOG_WARNING,
"coap_tls_write: "
"returned -0x%x: '%s'\n",
-ret, get_error_string(ret));
ret = -1;
while (amount_sent < data_len) {
ret = mbedtls_ssl_write(&m_env->ssl,
(const unsigned char*)&data[amount_sent],
data_len - amount_sent);
if (ret <= 0) {
switch (ret) {
case MBEDTLS_ERR_SSL_WANT_READ:
case MBEDTLS_ERR_SSL_WANT_WRITE:
ret = 0;
break;
case MBEDTLS_ERR_NET_CONN_RESET:
case MBEDTLS_ERR_SSL_FATAL_ALERT_MESSAGE:
c_session->dtls_event = COAP_EVENT_DTLS_CLOSED;
ret = -1;
break;
default:
coap_log(LOG_WARNING,
"coap_tls_write: "
"returned -0x%x: '%s'\n",
-ret, get_error_string(ret));
ret = -1;
break;
}
if (ret == -1) {
coap_log(LOG_WARNING, "coap_tls_write: cannot send PDU\n");
}
break;
}
if (ret == -1) {
coap_log(LOG_WARNING, "coap_tls_write: cannot send PDU\n");
}
amount_sent += ret;
}
} else {
ret = do_mbedtls_handshake(c_session, m_env);