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ssl_server2.c: DTLS: Attempt to read the response to the close notification

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Signed-off-by: Ronald Cron <ronald.cron@arm.com>
This commit is contained in:
Ronald Cron
2026-01-21 11:33:35 +01:00
parent fa5e75d6f6
commit 2e9b9681e6
3 changed files with 51 additions and 1 deletions
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50
programs/ssl/ssl_server2.c
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@@ -4133,7 +4133,55 @@ close_notify:
} while (ret == MBEDTLS_ERR_SSL_WANT_WRITE);
ret = 0;
mbedtls_printf(" done\n");
/*
* In the DTLS case, attempt to read a possible response to the close
* notification. This avoids reconnecting to the same client when we
* reset and later receive its close-notification response during
* step 3 (waiting for a client to connect).
*
* Stop waiting for the response if the connection has already ended.
*
* The waiting loop below relies on mbedtls_ssl_read() returning regularly
* in order to keep the total waiting time approximately bounded to 1s. If
* no read timeout is configured (see the read_timeout option), or if the
* configured timeout is close to or larger than 1s, the total waiting time
* may exceed 1s by a significant margin.
*/
#if defined(MBEDTLS_SSL_PROTO_DTLS) && defined(MBEDTLS_HAVE_TIME)
if (opt.transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) {
mbedtls_ms_time_t start = mbedtls_ms_time();
for (;;) {
ret = mbedtls_ssl_read(&ssl, buf, opt.buffer_size);
/*
* mbedtls_ssl_read() returned some data or timed out, loop if we
* have not spent already too much time, quite arbitrarily 1s.
*/
if ((ret > 0) || (ret == MBEDTLS_ERR_SSL_TIMEOUT)) {
if ((mbedtls_ms_time() - start) < 1000) {
continue;
}
}
if (ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) {
mbedtls_printf(" done, received client close notification.\n");
} else {
/* ret = 0, silent transport EOF or ret < 0 except
* MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY. Note that we do not
* handle specifically the non-fatal error codes like
* MBEDTLS_ERR_SSL_WANT_READ as we do not really expect them
* here.
*/
mbedtls_printf(" done\n");
}
break;
}
ret = 0;
} else
#endif /* MBEDTLS_SSL_PROTO_DTLS && MBEDTLS_HAVE_TIME */
{
mbedtls_printf(" done\n");
}
fflush(stdout);
#if defined(MBEDTLS_SSL_CACHE_C)
if (opt.cache_remove > 0) {