NAME

       gnutls_x509_crt_check_hostname2 - API function

SYNOPSIS

       #include <gnutls/x509.h>

       int   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 © 2001-2021 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/