gnutls_x509_crt_check_hostname2(3)

NAME
gnutls_x509_crt_check_hostname2 - API function

SYNOPSIS
#include <gnutls/x509.h>

unsigned gnutls_x509_crt_check_hostname2(gnutls_x509_crt_t cert, const char * hostname, unsigned int flags);

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

unsigned int flags
    gnutls_certificate_verify_flags

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.

IPv4 addresses are accepted by this function in the dotted-decimal format (e.g, ddd.ddd.ddd.ddd), and IPv6 addresses in the hexadecimal x:x:x:x:x:x:x:x format. For them the IPAddress subject alternative name extension is consulted, as well as the DNSNames in case of a non-match. The latter fallback exists due to misconfiguration of many servers which place an IPAddress inside the DNSName extension.

When the flag GNUTLS_VERIFY_DO_NOT_ALLOW_WILDCARDS is specified no wildcards are considered. Otherwise they are only considered if the domain name consists of three components or more, and the wildcard starts at the leftmost position.

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

REPORTING BUGS
Report bugs to <bugs@gnutls.org>.
Home page: http://www.gnutls.org

COPYRIGHT
Copyright © 2001-2016 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

http://www.gnutls.org/manual/