Provided by: libc-ares-dev_1.7.5-1_amd64 bug


       ares_mkquery - Compose a single-question DNS query buffer


       #include <ares.h>

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


       The ares_mkquery 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.


       ares_mkquery 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.


       ares_expand_name(3), ares_free_string(3)


       Greg Hudson, MIT Information Systems
       Copyright 1998, 2000 by the Massachusetts Institute of Technology.

                                           20 Nov 2009                            ARES_MKQUERY(3)