lwres_getrrsetbyname

LWRES_GETRRSETBYNAME(3)				      LWRES_GETRRSETBYNAME(3)



NAME
       lwres_getrrsetbyname, lwres_freerrset - retrieve DNS records

SYNOPSIS
       #include <lwres/netdb.h>

       int lwres_getrrsetbyname(const char *hostname, unsigned int rdclass,
       unsigned int rdtype, unsigned int flags, struct rrsetinfo **res);

       void lwres_freerrset(struct rrsetinfo *rrset);


       The following structures are used:

       struct  rdatainfo {
	       unsigned int	       rdi_length;     /* length of data */
	       unsigned char	       *rdi_data;      /* record data */
       };

       struct  rrsetinfo {
	       unsigned int	       rri_flags;      /* RRSET_VALIDATED... */
	       unsigned int	       rri_rdclass;    /* class number */
	       unsigned int	       rri_rdtype;     /* RR type number */
	       unsigned int	       rri_ttl;	       /* time to live */
	       unsigned int	       rri_nrdatas;    /* size of rdatas array */
	       unsigned int	       rri_nsigs;      /* size of sigs array */
	       char		       *rri_name;      /* canonical name */
	       struct rdatainfo	       *rri_rdatas;    /* individual records */
	       struct rdatainfo	       *rri_sigs;      /* individual signatures */
       };


DESCRIPTION
       lwres_getrrsetbyname() gets a set of resource records associated	 with
       a  hostname,  class, and type.  hostname is a pointer a to null-termi-
       nated string. The flags field is currently unused and must be zero.

       After a successful call to lwres_getrrsetbyname(), *res is  a  pointer
       to  an rrsetinfo structure, containing a list of one or more rdatainfo
       structures containing resource records and potentially another list of
       rdatainfo  structures  containing SIG resource records associated with
       those records.  The members rri_rdclass and rri_rdtype are copied from
       the  parameters.	  rri_ttl and rri_name are properties of the obtained
       rrset.  The resource records contained in rri_rdatas and rri_sigs  are
       in  uncompressed DNS wire format.  Properties of the rdataset are rep-
       resented in the rri_flags bitfield. If the RRSET_VALIDATED bit is set,
       the data has been DNSSEC validated and the signatures verified.

       All  of	the information returned by lwres_getrrsetbyname() is dynami-
       cally allocated: the  rrsetinfo	and  rdatainfo	structures,  and  the
       canonical  host	name  strings  pointed	to by the rrsetinfostructure.
       Memory allocated for the dynamically allocated structures created by a
       successful    call    to	  lwres_getrrsetbyname()   is	released   by
       lwres_freerrset().  rrset is a pointer to a struct rrset created by  a
       call to lwres_getrrsetbyname().


RETURN VALUES
       lwres_getrrsetbyname() returns zero on success, and one of the follow-
       ing error codes if an error occurred:

       ERRSET_NONAME
	      the name does not exist

       ERRSET_NODATA
	      the name exists, but does not have data of the desired type

       ERRSET_NOMEMORY
	      memory could not be allocated

       ERRSET_INVAL
	      a parameter is invalid

       ERRSET_FAIL
	      other failure



       SEE ALSO

       lwres(3).



BIND9				 Oct 18, 2000	      LWRES_GETRRSETBYNAME(3)