=pod

=head1 NAME

BIO_hostserv_priorities,
BIO_parse_hostserv
- utility routines to parse a standard host and service string

=head1 SYNOPSIS

 #include <openssl/bio.h>

 enum BIO_hostserv_priorities {
     BIO_PARSE_PRIO_HOST, BIO_PARSE_PRIO_SERV
 };
 int BIO_parse_hostserv(const char *hostserv, char **host, char **service,
                        enum BIO_hostserv_priorities hostserv_prio);

=head1 DESCRIPTION

BIO_parse_hostserv() will parse the information given in B<hostserv>,
create strings with the hostname and service name and give those
back via B<host> and B<service>.  Those will need to be freed after
they are used.  B<hostserv_prio> helps determine if B<hostserv> shall
be interpreted primarily as a hostname or a service name in ambiguous
cases.

The syntax the BIO_parse_hostserv() recognises is:

 host + ':' + service
 host + ':' + '*'
 host + ':'
        ':' + service
 '*'  + ':' + service
 host
 service

The host part can be a name or an IP address.  If it's a IPv6
address, it MUST be enclosed in brackets, such as '[::1]'.

The service part can be a service name or its port number.  A service name
will be mapped to a port number using the system function getservbyname().

The returned values will depend on the given B<hostserv> string
and B<hostserv_prio>, as follows:

 host + ':' + service  => *host = "host", *service = "service"
 host + ':' + '*'      => *host = "host", *service = NULL
 host + ':'            => *host = "host", *service = NULL
        ':' + service  => *host = NULL, *service = "service"
  '*' + ':' + service  => *host = NULL, *service = "service"

 in case no ':' is present in the string, the result depends on
 hostserv_prio, as follows:

 when hostserv_prio == BIO_PARSE_PRIO_HOST
 host                 => *host = "host", *service untouched

 when hostserv_prio == BIO_PARSE_PRIO_SERV
 service              => *host untouched, *service = "service"

=head1 RETURN VALUES

BIO_parse_hostserv() returns 1 on success or 0 on error.

=head1 SEE ALSO

L<BIO_ADDRINFO(3)>

=head1 COPYRIGHT

Copyright 2016-2021 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the "License").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.

=cut