gnutls\_x509\_crt\_check\_hostname(3) gnutls gnutls\_x509\_crt\_check\_hostname(3)

# [NAME](#NAME)

gnutls\_x509\_crt\_check\_hostname - API function

# [SYNOPSIS](#SYNOPSIS)

**#include <gnutls/x509.h>**

**unsigned gnutls\_x509\_crt\_check\_hostname(gnutls\_x509\_crt\_t cert, const char * hostname);**

# [ARGUMENTS](#ARGUMENTS)

[gnutls\_x509\_crt\_t cert](#gnutls_x509_crt_t)

should contain an gnutls\_x509\_crt\_t type

[const char * hostname](#const)

A null terminated string that contains a DNS name

# [DESCRIPTION](#DESCRIPTION)

This function will check if the given certificate's subject matches the given hostname. This is a basic implementation of the matching described in RFC6125, and takes into account wildcards, and the DNSName/IPAddress subject alternative name PKIX extension.

For details see also **gnutls\_x509\_crt\_check\_hostname2()**.

# [RETURNS](#RETURNS)

non-zero for a successful match, and zero on failure.

# [REPORTING BUGS](#REPORTING_BUGS)

Report bugs to <bugs@gnutls.org>.  
Home page: https://www.gnutls.org

# [COPYRIGHT](#COPYRIGHT)

Copyright © 2001-2023 Free Software Foundation, Inc., and others.  
Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.

# [SEE ALSO](#SEE_ALSO)

The full documentation for **gnutls** is maintained as a Texinfo manual. If the /usr/share/doc/gnutls/ directory does not contain the HTML form visit

[https://www.gnutls.org/manual/](https://www.gnutls.org/manual/)

3.8.13 gnutls

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Document: gnutls_x509_crt_check_hostname(3) from gnutls 3.8.13-r1 (Chainguard OS)
Source: https://gitlab.com/gnutls/gnutls