NAME

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

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);

DESCRIPTION

       BIO_parse_hostserv() will parse the information given in hostserv, create strings with the
       hostname and service name and give those back via host and service.  Those will need to be
       freed after they are used.  hostserv_prio helps determine if 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 hostserv string and 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"

RETURN VALUES

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

SEE ALSO

       BIO_ADDRINFO(3)

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 <https://www.openssl.org/source/license.html>.