---
name: "gnutls_x509_name_constraints_check_crt"
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_name_constraints_check_crt"
---

# gnutls\_x509\_name\_constraints\_check\_crt(3)

API function

## NAME

gnutls\_x509\_name\_constraints\_check\_crt - API function

## SYNOPSIS

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

**unsigned gnutls\_x509\_name\_constraints\_check\_crt(gnutls\_x509\_name\_constraints\_t** *nc***, gnutls\_x509\_subject\_alt\_name\_t** *type***, gnutls\_x509\_crt\_t** *cert***);**

## ARGUMENTS

- gnutls\_x509\_name\_constraints\_t nc

  the extracted name constraints

- gnutls\_x509\_subject\_alt\_name\_t type

  the type of the constraint to check (of type gnutls\_x509\_subject\_alt\_name\_t)

- gnutls\_x509\_crt\_t cert

  the certificate to be checked

## DESCRIPTION

This function will check the provided certificate names against the constraints in\
  *nc* using the RFC5280 rules. It will traverse all the certificate's names and alternative names.

Currently this function is limited to DNS names and emails (of type **GNUTLS\_SAN\_DNSNAME** and **GNUTLS\_SAN\_RFC822NAME**).

## RETURNS

zero if the provided name is not acceptable, and non-zero otherwise.

## SINCE

3\.3.0

## 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/