---
name: "gnutls_x509_crt_check_hostname"
section: "3"
platform: "linux"
package: "gnutls"
version: "3.8.13-3"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/gnutls_x509_crt_check_hostname"
---

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

API function

## NAME

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

## SYNOPSIS

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

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

## ARGUMENTS

- gnutls\_x509\_crt\_t cert

  should contain an gnutls\_x509\_crt\_t type

- const char \* hostname

  A null terminated string that contains a DNS name

## 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

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

## REPORTING BUGS

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

## 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

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/