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NAME="NET-COMMON-TCPIP-MANPAGES-GETRRSETBYNAME">getrrsetbyname</H1
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>GETRRSETBYNAME(3) System Library Functions Manual GETRRSETBYNAME(3)
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NAME
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getrrsetbyname - retrieve DNS records
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SYNOPSIS
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#include <netdb.h>
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int
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getrrsetbyname(const char *hostname, unsigned int rdclass,
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unsigned int rdtype, unsigned int flags, struct rrsetinfo **res);
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int
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freerrset(struct rrsetinfo **rrset);
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DESCRIPTION
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getrrsetbyname() gets a set of resource records associated with a
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hostname, class and type. hostname is a pointer a to null-terminated
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string. The flags field is currently unused and must be zero.
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After a successful call to getrrsetbyname(), *res is a pointer to an
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rrsetinfo structure, containing a list of one or more rdatainfo struc-
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tures containing resource records and potentially another list of
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rdatainfo structures containing SIG resource records associated with
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those records. The members rri_rdclass and rri_rdtype are copied from
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the parameters. rri_ttl and rri_name are properties of the obtained
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rrset. The resource records contained in rri_rdatas and rri_sigs are in
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uncompressed DNS wire format. Properties of the rdataset are represented
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in the rri_flags bitfield. If the RRSET_VALIDATED bit is set, the data
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has been DNSSEC validated and the signatures verified.
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The following structures are used:
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struct rdatainfo {
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unsigned int rdi_length; /* length of data */
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unsigned char *rdi_data; /* record data */
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};
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struct rrsetinfo {
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unsigned int rri_flags; /* RRSET_VALIDATED ... */
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unsigned int rri_rdclass; /* class number */
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unsigned int rri_rdtype; /* RR type number */
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unsigned int rri_ttl; /* time to live */
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unsigned int rri_nrdatas; /* size of rdatas array */
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unsigned int rri_nsigs; /* size of sigs array */
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char *rri_name; /* canonical name */
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struct rdatainfo *rri_rdatas; /* individual records */
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struct rdatainfo *rri_sigs; /* individual signatures */
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};
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All of the information returned by getrrsetbyname() is dynamically allo-
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cated: the rrsetinfo and rdatainfo structures, and the canonical host
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name strings pointed to by the rrsetinfostructure. Memory allocated for
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the dynamically allocated structures created by a successful call to
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getrrsetbyname() is released by freerrset(). rrset is a pointer to a
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struct rrset created by a call to getrrsetbyname().
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If the EDNS0 option is activated in resolv.conf(3), getrrsetbyname() will
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request DNSSEC authentication using the EDNS0 DNSSEC OK (DO) bit.
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RETURN VALUES
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getrrsetbyname() returns zero on success, and one of the following error
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codes if an error occurred:
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ERRSET_NONAME the name does not exist
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ERRSET_NODATA the name exists, but does not have data of the desired
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type
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ERRSET_NOMEMORY memory could not be allocated
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ERRSET_INVAL a parameter is invalid
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ERRSET_FAIL other failure
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SEE ALSO
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resolver(3), resolv.conf(5), named(8)
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AUTHORS
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Jakob Schlyter <jakob@openbsd.org>
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HISTORY
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getrrsetbyname() first appeared in OpenBSD 3.0. The API first appeared
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in ISC BIND version 9.
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BUGS
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The data in *rdi_data should be returned in uncompressed wire format.
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Currently, the data is in compressed format and the caller can't uncom-
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press since it doesn't have the full message.
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CAVEATS
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The RRSET_VALIDATED flag in rri_flags is set if the AD (autenticated
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data) bit in the DNS answer is set. This flag should not be trusted
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unless the transport between the nameserver and the resolver is secure
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(e.g. IPsec, trusted network, loopback communication).
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BSD Oct 18, 2000 BSD
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</PRE
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