ldns(3) Library Functions Manual ldns(3)

# [NAME](#NAME)

ldns\_rr\_descriptor, ldns\_rr\_descript, ldns\_rr\_descriptor\_minimum, ldns\_rr\_descriptor\_maximum, ldns\_rr\_descriptor\_field\_type - rdata field descriptors

# [SYNOPSIS](#SYNOPSIS)

#include <stdint.h>  
#include <stdbool.h>

#include <ldns/ldns.h>

const ldns\_rr\_descriptor* ldns\_rr\_descript(uint16\_t type);

size\_t ldns\_rr\_descriptor\_minimum(const ldns\_rr\_descriptor \*descriptor);

size\_t ldns\_rr\_descriptor\_maximum(const ldns\_rr\_descriptor \*descriptor);

ldns\_rdf\_type ldns\_rr\_descriptor\_field\_type(const ldns\_rr\_descriptor \*descriptor, size\_t field);

# [DESCRIPTION](#DESCRIPTION)

*ldns\_rr\_descriptor*  
Contains all information about resource record types.

This structure contains, for all rr types, the rdata fields that are defined.  
struct ldns\_struct\_rr\_descriptor  
{  
**Type of the RR that is described here:**  
ldns\_rr\_type \_type;  
**Textual name of the RR type.:**  
const char \*\_name;  
**Minimum number of rdata fields in the RRs of this type.:**  
uint8\_t \_minimum;  
**Maximum number of rdata fields in the RRs of this type.:**  
uint8\_t \_maximum;  
**Wireformat specification for the rr, i.e. the types of rdata fields in their respective order.:**  
const ldns\_rdf\_type \*\_wireformat;  
**Special rdf types:**  
ldns\_rdf\_type \_variable;  
**Specifies whether compression can be used for dnames in this RR type.:**  
ldns\_rr\_compress \_compress;  
**The number of DNAMEs in the \_wireformat string, for parsing.:**  
uint8\_t \_dname\_count;  
};  
typedef struct ldns\_struct\_rr\_descriptor ldns\_rr\_descriptor;

*ldns\_rr\_descript*() returns the resource record descriptor for the given rr type.

**type**: the type value of the rr type  
Returns the ldns\_rr\_descriptor for this type

*ldns\_rr\_descriptor\_minimum*() returns the minimum number of rdata fields of the rr type this descriptor describes.

**descriptor**: for an rr type  
Returns the minimum number of rdata fields

*ldns\_rr\_descriptor\_maximum*() returns the maximum number of rdata fields of the rr type this descriptor describes.

**descriptor**: for an rr type  
Returns the maximum number of rdata fields

*ldns\_rr\_descriptor\_field\_type*() returns the rdf type for the given rdata field number of the rr type for the given descriptor.

**descriptor**: for an rr type  
**field**: the field number  
Returns the rdf type for the field

# [AUTHOR](#AUTHOR)

The ldns team at NLnet Labs.

# [REPORTING BUGS](#REPORTING_BUGS)

Please report bugs to dns-team@nlnetlabs.nl or on GitHub at https://github.com/NLnetLabs/ldns/issues

# [COPYRIGHT](#COPYRIGHT)

Copyright (c) 2004 - 2006 NLnet Labs.

Licensed under the BSD License. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

# [SEE ALSO](#SEE_ALSO)

*ldns\_rr*, *ldns\_rdf*. And **perldoc Net::DNS**, **RFC1034**, **RFC1035**, **RFC4033**, **RFC4034** and **RFC4035**.

# [REMARKS](#REMARKS)

This manpage was automatically generated from the ldns source code.

30 May 2006

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Document: ldns_rr_descriptor_minimum(3) from ldns 1.9.2-r3 (Chainguard OS)
Source: https://github.com/NLnetLabs/ldns.git