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 ares_create_query 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 ares_free_string(3)  when  it  is  no  longer
       needed.     The    parameter    max_udp_size   should   be   nonzero   to   activate   EDNS.   Usage   of
       ares_create_query(3) with max_udp_size set to zero is equivalent to ares_mkquery(3).

RETURN VALUES

       ares_create_query can return any of the following values:

       ARES_SUCCESS   Construction of the DNS query succeeded.

       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)

AUTHOR

                                                   17 Aug 2012                              ARES_CREATE_QUERY(3)