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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-terminated
       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 repre-
       sented 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 canon-
       ical  host  name  strings pointed to by the rrsetinfostructure.	Memory
       allocated for the dynamically allocated structures created  by  a  suc-
       cessful	  call	  to	lwres_getrrsetbyname()	  is	released    by
       lwres_freerrset().  rrset is a pointer to a struct rrset created  by  a
       call to lwres_getrrsetbyname().

       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)

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