ARES_CREATE_QUERY(3)   FreeBSD Library Functions Manual   ARES_CREATE_QUERY(3)

NAME
       ares_create_query - Compose a single-question DNS query buffer

SYNOPSIS
       #include <ares.h>

       int ares_create_query(const char *name,
                             int dnsclass,
                             int type,
                             unsigned short id,
                             int rd,
                             unsigned char **buf,
                             int *buflen,
                             int max_udp_size)

DESCRIPTION
       The _create_query&section=3">ares_create_query(3) function composes a DNS query with a single
       question.  The parameter name gives the query name as a NUL-terminated
       C string of period-separated labels optionally ending with a period;
       periods and backslashes within a label must be escaped with a backlash.

       The parameters dnsclass and type give the class and type of the query
       using the values defined in <arpa/nameser.h>.

       The parameter id gives a 16-bit identifier for the query.

       The parameter rd should be nonzero if recursion is desired, zero if
       not.

       The query will be placed in an allocated buffer, a pointer to which
       will be stored in the variable pointed to by buf, and the length of
       which will be stored in the variable pointed to by buflen.

       It is the caller's responsibility to free this buffer using
       _free_string&section=3">ares_free_string(3) when it is no longer needed.  The parameter
       max_udp_size should be nonzero to activate EDNS. Usage of
       _create_query&section=3">ares_create_query(3) with max_udp_size set to zero is equivalent to
       using _mkquery&section=3">ares_mkquery(3).

RETURN VALUES
       ares_create_query can return any of the following values:

       ARES_SUCCESS   Construction of the DNS query succeeded.

       ARES_ENOTFOUND The query name name refers to a .onion domain name. See
                      RFC 7686.

       ARES_EBADNAME  The query name name could not be encoded as a domain
                      name, either because it contained a zero-length label or
                      because it contained a label of more than 63 characters.

       ARES_ENOMEM    Memory was exhausted.

AVAILABILITY
       Added in c-ares 1.10.0

SEE ALSO
       ares_expand_name(3), ares_free_string(3), ares_mkquery(3)

AUTHOR

                                  17 Aug 2012             ARES_CREATE_QUERY(3)