[#SSL_add1_host]
= SSL_add1_host
:mrdocs:

Add an additional expected DNS hostname for peer certificate name checks.

== Synopsis

Declared in `<openssl/ssl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
SSL_add1_host(
    xref:SSL.adoc[SSL]* s,
    char const* hostname);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *s*
| Client SSL connection; existing hostnames from SSL_set1_host / SSL_add1_host are retained.
| *hostname*
| Hostname to add; NULL or empty leaves the list unchanged.
|===


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