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Man Pages


Manual Reference Pages  -  DNSTABLE_MERGE_FUNC (3)

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NAME

dnstable_merge_func - libmtbl merge function for dnstable key-value entries

CONTENTS

SYNOPSIS

#include <dnstable.h>

void
dnstable_merge_func(void *clos,
                    const uint8_t *key, size_t len_key,
                    const uint8_t *val0, size_t len_val0,
                    const uint8_t *val1, size_t len_val1,
                    uint8_t **merged_val, size_t *len_merged_val);

DESCRIPTION

This is the libmtbl merging function for dnstable key-value entries. dnstable is built on libmtbl, and libmtbl requires a \(lqmerge function\(rq to resolve conflicting values between identical keys. The symbol dnstable_merge_func can be provided to libmtbl functions requiring a merge function when dealing with dnstable key-value data.

There are four dnstable MTBL key-value entry types. dnstable_merge_func handles them in the following manner:

ENTRY_TYPE_RRSET_NAME_FWD and ENTRY_TYPE_RDATA_NAME_REV entries have no associated value (that is, the values for these types is zero length). A zero-length byte array is provided as the merged value.

ENTRY_TYPE_RRSET and ENTRY_TYPE_RDATA entries have an identical encoding format. These types encode a triplet of varint-encoded integers representing the time_first, time_last, and count value fields. A new triplet of varint-encoded integers is generated as the merged value as follows:

o

o The earliest (that is, smallest) of the two time_first values is taken as the merged time_first value.

o

o The latest (that is, largest) of the two time_last values is taken as the merged time_last value.

o

o The two count values are added together.

SEE ALSO

dnstable-encoding(5), mtbl_merger(3)

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& DNSTABLE_MERGE_FUNC (3) 11/10/2015

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