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- stretch 1:9.10.3.dfsg.P4-12.3+deb9u4
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LWRES_GETRRSETBYNAME(3) | BIND9 | LWRES_GETRRSETBYNAME(3) |
NAME¶
lwres_getrrsetbyname, lwres_freerrset - retrieve DNS recordsSYNOPSIS¶
#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
ERRSET_NODATA
ERRSET_NOMEMORY
ERRSET_INVAL
ERRSET_FAIL
SEE ALSO¶
lwres(3).COPYRIGHT¶
Copyright © 2004, 2005, 2007, 2014 Internet Systems Consortium, Inc. ("ISC")Copyright © 2000, 2001 Internet Software Consortium.
June 18, 2007 | BIND9 |