lwres_getrrsetbyname man page on YellowDog
[printable version]
LWRES_GETRRSETBYNAME(3) BIND9 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
represented 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 VALUES
lwres_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).
COPYRIGHT
Copyright © 2004, 2005 Internet Systems Consortium, Inc. ("ISC")
BIND9 Oct 18, 2000 LWRES_GETRRSETBYNAME(3)
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