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 */
};
DESCRIPTIONlwres_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 struc-
tures 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 dynamically 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 VALUESlwres_getrrsetbyname() returns zero on success, and one of
the following 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)
