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

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       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>.

3.5.0                                              2025-06-04                           BIO_PARSE_HOSTSERV(3SSL)

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"

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

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

BIO_ADDRINFO(3)

        #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);