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-.\" $OpenBSD: getrrsetbyname.3,v 1.22 2022/09/11 06:38:10 jmc Exp $
-.\"
-.\" Copyright (C) 2000, 2001  Internet Software Consortium.
-.\"
-.\" Permission to use, copy, modify, and distribute this software for any
-.\" purpose with or without fee is hereby granted, provided that the above
-.\" copyright notice and this permission notice appear in all copies.
-.\"
-.\" THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
-.\" DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
-.\" INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
-.\" INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
-.\" FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
-.\" NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
-.\" WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-.\"
-.Dd $Mdocdate: September 11 2022 $
-.Dt GETRRSETBYNAME 3
-.Os
-.Sh NAME
-.Nm freerrset ,
-.Nm getrrsetbyname
-.Nd retrieve DNS records
-.Sh SYNOPSIS
-.In netdb.h
-.Ft int
-.Fn getrrsetbyname "const char *hostname" "unsigned int rdclass" \
-"unsigned int rdtype" "unsigned int flags" "struct rrsetinfo **res"
-.Ft void
-.Fn freerrset "struct rrsetinfo *rrset"
-.Sh DESCRIPTION
-.Fn getrrsetbyname
-gets a set of resource records associated with a
-.Fa hostname ,
-.Fa rdclass ,
-and
-.Fa rdtype .
-.Fa hostname
-is a pointer to a NUL-terminated string.
-The
-.Fa flags
-field is currently unused and must be zero.
-.Pp
-After a successful call to
-.Fn getrrsetbyname ,
-.Fa *res
-is a pointer to an
-.Vt rrsetinfo
-structure, containing a list of one or more
-.Vt rdatainfo
-structures containing resource records and potentially another list of
-.Vt rdatainfo
-structures containing SIG resource records associated with those records.
-The members
-.Li rri_rdclass
-and
-.Li rri_rdtype
-are copied from the parameters.
-.Li rri_ttl
-and
-.Li rri_name
-are properties of the obtained rrset.
-The resource records contained in
-.Li rri_rdatas
-and
-.Li rri_sigs
-are in uncompressed DNS wire format.
-Properties of the rdataset are represented in the
-.Li rri_flags
-bitfield.
-If the
-.Dv RRSET_VALIDATED
-bit is set, the data has been DNSSEC
-validated and the signatures verified.
-.Pp
-The following structures are used:
-.Bd -literal -offset indent
-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 */
-};
-.Ed
-.Pp
-All of the information returned by
-.Fn getrrsetbyname
-is dynamically allocated: the
-.Vt rrsetinfo
-and
-.Vt rdatainfo
-structures,
-and the canonical host name strings pointed to by the
-.Vt rrsetinfo
-structure.
-Memory allocated for the dynamically allocated structures created by
-a successful call to
-.Fn getrrsetbyname
-is released by
-.Fn freerrset .
-.Li rrset
-is a pointer to a
-.Vt struct rrsetinfo
-created by a call to
-.Fn getrrsetbyname .
-.\" .Pp
-.\" If the EDNS0 option is activated in
-.\" .Xr resolv.conf 5 ,
-.\" .Fn getrrsetbyname
-.\" will request DNSSEC authentication using the EDNS0 DNSSEC OK (DO) bit.
-.Sh RETURN VALUES
-.Fn getrrsetbyname
-returns zero on success, and one of the following error
-codes if an error occurred:
-.Bl -tag -width ERRSET_NOMEMORY
-.It Bq Er ERRSET_NONAME
-The name does not exist.
-.It Bq Er ERRSET_NODATA
-The name exists, but does not have data of the desired type.
-.It Bq Er ERRSET_NOMEMORY
-Memory could not be allocated.
-.It Bq Er ERRSET_INVAL
-A parameter is invalid.
-.It Bq Er ERRSET_FAIL
-Other failure.
-.El
-.Sh SEE ALSO
-.Xr res_init 3 ,
-.Xr resolv.conf 5
-.Sh HISTORY
-.Fn getrrsetbyname
-first appeared in
-.Ox 3.0 .
-The API first appeared in ISC BIND version 9.
-.Sh AUTHORS
-.An Jakob Schlyter Aq Mt jakob@openbsd.org
-.Sh CAVEATS
-The
-.Dv RRSET_VALIDATED
-flag in
-.Li rri_flags
-is set if the AD (authenticated data) bit in the DNS answer is
-set.
-This flag
-.Em should not
-be trusted unless the transport between the nameserver and the resolver
-is secure (e.g. IPsec, trusted network, loopback communication).
-.Sh BUGS
-The data in
-.Li *rdi_data
-should be returned in uncompressed wire format.
-Currently, the data is in compressed format and the caller can't
-uncompress since it doesn't have the full message.