ares_query man page on DragonFly

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ARES_QUERY(3)							 ARES_QUERY(3)

NAME
       ares_query - Initiate a single-question DNS query

SYNOPSIS
       #include <ares.h>

       typedef void (*ares_callback)(void *arg, int status,
       int timeouts, unsigned char *abuf, int alen)

       void ares_query(ares_channel channel, const char *name,
	    int dnsclass, int type, ares_callback callback,
       void *arg)

DESCRIPTION
       The  ares_query	function  initiates a single-question DNS query on the
       name service channel identified by channel.  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 backslash.  The parameters dnsclass and type
       give the class and type of  the	query  using  the  values  defined  in
       <arpa/nameser.h>.   When	 the query is complete or has failed, the ares
       library will invoke callback.  Completion or failure of the  query  may
       happen	immediately,   or   may	  happen   during   a  later  call  to
       ares_process(3) or ares_destroy(3).

       The callback argument arg is copied from the ares_query	argument  arg.
       The callback argument status indicates whether the query succeeded and,
       if not, how it failed.  It may have any of the following values:

       ARES_SUCCESS	  The query completed successfully.

       ARES_ENODATA	  The query completed but contains no answers.

       ARES_EFORMERR	  The query completed but the server claims  that  the
			  query was malformatted.

       ARES_ESERVFAIL	  The  query  completed	 but the server claims to have
			  experienced a failure.  (This code can only occur if
			  the  ARES_FLAG_NOCHECKRESP  flag  was	 specified  at
			  channel   initialization   time;   otherwise,	  such
			  responses are ignored at the ares_send(3) level.)

       ARES_ENOTFOUND	  The  query completed but the queried-for domain name
			  was not found.

       ARES_ENOTIMP	  The query completed but the server does  not	imple‐
			  ment	the  operation	requested by the query.	 (This
			  code can only	 occur	if  the	 ARES_FLAG_NOCHECKRESP
			  flag	was  specified at channel initialization time;
			  otherwise,  such  responses  are  ignored   at   the
			  ares_send(3) level.)

       ARES_EREFUSED	  The  query  completed	 but  the  server  refused the
			  query.   (This  code	 can   only   occur   if   the
			  ARES_FLAG_NOCHECKRESP	 flag was specified at channel
			  initialization time; otherwise, such	responses  are
			  ignored at the ares_send(3) level.)

       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_ETIMEOUT	  No name servers responded within the timeout period.

       ARES_ECONNREFUSED  No name servers could be contacted.

       ARES_ENOMEM	  Memory was exhausted.

       ARES_ECANCELLED	  The query was cancelled.

       ARES_EDESTRUCTION  The name service channel channel is being destroyed;
			  the query will not be completed.

       The callback argument timeouts reports how many times a query timed out
       during the execution of the given request.

       If the query completed (even if there was something wrong with  it,  as
       indicated by some of the above error codes), the callback argument abuf
       points to a result buffer of length alen.  If the query	did  not  com‐
       plete, abuf will be NULL and alen will be 0.

SEE ALSO
       ares_process(3)

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

				 24 July 1998			 ARES_QUERY(3)
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