[#DTLSv1_listen]
= DTLSv1_listen
:mrdocs:

Statelessly listen for a new DTLS ClientHello and verify the cookie exchange.

== Synopsis

Declared in `<openssl/ssl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
DTLSv1_listen(
    xref:SSL.adoc[SSL]* s,
    xref:BIO_ADDR.adoc[BIO_ADDR]* client);
----

== Return Value

>=1 when the handshake may continue (e.g. via SSL_accept), 0 to retry, or <0 on fatal error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *s*
| Newly allocated SSL with read/write BIOs set (typically an unconnected datagram BIO).
| *client*
| Receives the peer address when a verified ClientHello is accepted.
|===


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