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lwres_getrrsetbyname
Langue: en
Version: Oct 18, 2000 (CentOS - 06/07/09)
Section: 3 (Bibliothèques de fonctions)
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
- 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).
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