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ares_create_query

ARES_CREATE_QUERY(3)					     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  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)

Shell Programming and Scripting