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Andreas Gustafsson 1999-08-20 05:26:49 +00:00
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/*
* Copyright (C) 1999 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.
*/
#ifndef DNS_JOURNAL_H
#define DNS_JOURNAL_H 1
/*****
***** Module Info
*****/
/*
* Database journalling.
*/
/***
*** Imports
***/
#include <isc/types.h>
#include <dns/result.h>
/***
*** Types
***/
ISC_LANG_BEGINDECLS
/*
* A dns_difftuple_t represents a single RR being added or deleted.
* The RR type and class are in the 'rdata' member; the class is always
* the real one, not a DynDNS meta-class, so that the rdatas can be
* compared using dns_rdata_compare(). The TTL is ignored for
* RRs to be deleted.
*
* Tuples are also used to represent the individual RRs of a
* a "RRset exists (value dependent)" prerequisite set. In this case,
* op==DNS_DIFFOP_EXISTS, and the TTL is ignored.
*/
typedef enum {
DNS_DIFFOP_ADD, /* Add an RR. */
DNS_DIFFOP_DEL, /* Delete an RR. */
DNS_DIFFOP_EXISTS /* Assert RR existence. */
} dns_diffop_t;
typedef struct dns_difftuple dns_difftuple_t;
#define DIFFTUPLE_MAGIC 0x44494654U /* DIFT. */
#define VALID_DIFFTUPLE(t) ((t) != NULL && \
(t)->magic == DIFFTUPLE_MAGIC)
struct dns_difftuple {
unsigned int magic;
isc_mem_t *mctx;
dns_diffop_t op;
dns_name_t name;
dns_ttl_t ttl;
dns_rdata_t rdata;
ISC_LINK(dns_difftuple_t) link;
/* Variable-size name data and rdata follows. */
};
/*
* A dns_diff_t represents a set of changes being applied to
* a zone. Diffs are also used to represent "RRset exists
* (value dependent)" prerequisites.
*/
typedef struct dns_diff dns_diff_t;
#define DIFF_MAGIC 0x44494646U /* DIFF. */
#define VALID_DIFF(t) ((t) != NULL && \
(t)->magic == DIFF_MAGIC)
struct dns_diff {
unsigned int magic;
isc_mem_t * mctx;
ISC_LIST(dns_difftuple_t) tuples;
};
/* Type of comparision function for sorting diffs. */
typedef int dns_diff_compare_func(const void *, const void *);
/*
* A dns_journal_t represents an open journal file. This is an opaque type.
*
* A particular dns_journal_t object may be opened for writing, in which case
* it can be used for writing transactions to a journal file, or it can be
* opened for reading, in which case it can be used for reading transactions
* from (iterating over) a journal file. A single dns_journal_t object may
* not be used for both purposes.
*/
typedef struct dns_journal dns_journal_t;
/***
*** Functions
***/
/**************************************************************************/
/*
* Maniuplation of diffs and tuples.
*/
dns_result_t
dns_difftuple_create(isc_mem_t *mctx,
dns_diffop_t op, dns_name_t *name, dns_ttl_t ttl,
dns_rdata_t *rdata, dns_difftuple_t **tp);
/*
* Create a tuple. Deep copies are made of the name and rdata, so
* they need not remain valid after the call.
*
* Requires:
* *tp != NULL && *tp == NULL.
*
* Returns:
* ISC_R_SUCCESS
* ISC_R_NOMEMORY
*/
void
dns_difftuple_free(dns_difftuple_t **tp);
/*
* Free a tuple.
*
* Requires:
* **tp is a valid tuple.
*
* Ensures:
* *tp == NULL
* All memory used by the tuple is freed.
*/
dns_result_t
dns_difftuple_copy(dns_difftuple_t *orig, dns_difftuple_t **copyp);
/*
* Copy a tuple.
*
* Requires:
* 'orig' points to a valid tuple
* copyp != NULL && *copyp == NULL
*/
void dns_diff_init(isc_mem_t *mctx, dns_diff_t *diff);
/*
* Initialize a diff.
*
* Requires:
* 'diff' points to an uninitialized dns_diff_t
* allocated by the caller.
*
* Ensures:
* '*diff' is a valid, empty diff.
*/
void dns_diff_clear(dns_diff_t *diff);
/*
* Clear a diff, destroying all its tuples.
*
* Requires:
* 'diff' points to a valid dns_diff_t.
*
* Ensures:
* Any tuples in the diff are destroyed.
* The diff now empty, but it is still valid
* and may be reused without calling dns_diff_init
* again. The only memory used is that of the
* dns_diff_t structure itself.
*
* Notes:
* Managing the memory of the dns_diff_t structure itself
* is the caller's responsibility.
*/
void
dns_diff_append(dns_diff_t *diff, dns_difftuple_t **tuple);
/*
* Append a single tuple to a diff.
*
* 'diff' is a valid diff.
* '*tuple' is a valid tuple.
*
* Ensures:
* *tuple is NULL.
* The tuple has been freed, or will be freed when the diff is cleared.
*/
void
dns_diff_appendminimal(dns_diff_t *diff, dns_difftuple_t **tuple);
/*
* Append 'tuple' to 'diff', removing any duplicate
* or conflicting updates as needed to create a minimal diff.
*
* Requires:
* 'diff' is a minimal diff.
*
* Ensures:
* 'diff' is still a minimal diff.
* *tuple is NULL.
* The tuple has been freed, or will be freed when the diff is cleared.
*
*/
dns_result_t
dns_diff_sort(dns_diff_t *diff, dns_diff_compare_func *compare);
/*
* Sort 'diff' in-place according to the comparison function 'compare'.
*/
dns_result_t
dns_diff_apply(dns_diff_t *diff, dns_db_t *db, dns_dbversion_t *ver);
/*
* Apply 'diff' to the database 'db'.
*
* For efficiency, the diff should be sorted by owner name.
* If it is not sorted, operation will still be correct,
* but less efficient.
*
* Requires:
* *diff is a valid diff (possibly empty), containing
* tuples of type DNS_DIFFOP_ADD and/or
* For DNS_DIFFOP_DEL tuples, the TTL is ignored.
*
*/
dns_result_t
dns_diff_load(dns_diff_t *diff, dns_addrdatasetfunc_t addfunc,
void *add_private);
/*
* Like dns_diff_apply, but for use when loading a new database
* instead of modifying an existing one. This bypasses the
* database transaction mechanisms.
*
* Requires:
* 'addfunc' is a valid dns_addradatasetfunc_t obtained from
* dns_db_beginload()
*
* 'add_private' points to a corresponding dns_dbload_t *
* (XXX why is it a void pointer, then?)
*/
void dns_diff_print(dns_diff_t *diff);
/* Print a diff. This is for debugging, not for general use. */
/**************************************************************************/
/*
* Misc. utilities
* XXX these belong in a general-purpose DNS library
*/
isc_uint32_t dns_soa_getserial(dns_rdata_t *rdata);
/*
* Extract the serial number from the rdata of a SOA record.
*
* Requires:
* rdata refers to the rdata of a well-formed SOA record.
*/
void dns_soa_setserial(isc_uint32_t val, dns_rdata_t *rdata);
/*
* Change the serial number of a SOA record by modifying the
* rdata in-place.
*
* Requires:
* rdata refers to the rdata of a well-formed SOA record.
*/
dns_result_t
dns_db_getsoaserial(dns_db_t *db, dns_dbversion_t *ver, isc_uint32_t *serialp);
/*
* Get the current SOA serial number from a zone database.
*
* Requires:
* 'db' is a valid database with zone semantics.
* 'ver' is a valid version.
*/
dns_result_t
dns_db_createsoatuple(dns_db_t *db, dns_dbversion_t *ver, isc_mem_t *mctx,
dns_diffop_t op, dns_difftuple_t **tp);
/*
* Create a diff tuple for the current database SOA.
*/
#define DNS_SERIAL_GT(a, b) ((int)(((a) - (b)) & 0xFFFFFFFF) > 0)
#define DNS_SERIAL_GE(a, b) ((int)(((a) - (b)) & 0xFFFFFFFF) >= 0)
/*
* Compare SOA serial numbers. DNS_SERIAL_GT(a, b) returns true iff
* a is "greater than" b where "greater than" is as defined in RFC1982.
* DNS_SERIAL_GE(a, b) returns true iff a is "greater than or equal to" b.
*/
/**************************************************************************/
/*
* Journal object creation and destruction.
*/
dns_result_t
dns_journal_open(isc_mem_t *mctx, char *filename, isc_boolean_t write,
dns_journal_t **journalp);
/*
* Open the journal file 'filename' and create a dns_journal_t object for it.
*
* If 'write' is ISC_TRUE, the journal is open for writing. If it does
* not exist, it is created.
*
* If 'write' is ISC_FALSE, the journal is open for reading. If it does
* not exist, ISC_R_NOTFOUND is returned.
*/
void
dns_journal_destroy(dns_journal_t **journalp);
/*
* Destroy a dns_journal_t, closing any open files and freeing its memory.
*/
/**************************************************************************/
/*
* Writing transactions to journals.
*/
dns_result_t
dns_journal_begin_transaction(dns_journal_t *j);
/*
* Prepare to write a new transaction to the open journal file 'j'.
*
* Requires:
* 'j' is open for writing.
*/
dns_result_t
dns_journal_writediff(dns_journal_t *j, dns_diff_t *diff);
/*
* Write 'diff' to the current transaction of journal file 'j'.
*
* Requires:
* 'j' is open for writing and dns_journal_begin_transaction()
* has been called.
*
* 'diff' is a full or partial, correctly ordered IXFR
* difference sequence.
*/
dns_result_t
dns_journal_commit(dns_journal_t *j);
/*
* Commit the current transaction of journal file 'j'.
*
* Requires:
* 'j' is open for writing and dns_journal_begin_transaction()
* has been called.
*
* dns_journal_writediff() has been called one or more times
* to form a complete, correctly ordered IXFR difference
* sequence.
*/
dns_result_t
dns_journal_commit(dns_journal_t *j);
/*
* Close the open journal file 'j' and ensure that any transactions
* written to it will become persistent.
*
* Requires:
* 'j' is open for writing.
*/
dns_result_t
dns_journal_write_transaction(dns_journal_t *j, dns_diff_t *diff);
/*
* Write a complete transaction at once to a journal file,
* sorting it if necessary, and commit it.
*
* Requires:
* 'j' is open for writing.
*
* 'diff' contains exactly one SOA deletion, one SOA addition
* with a greater serial number, and possibly other changes,
* in arbitrary order.
*/
/**************************************************************************/
/*
* Reading transactions from journals.
*/
isc_uint32_t dns_journal_first_serial(dns_journal_t *j);
isc_uint32_t dns_journal_last_serial(dns_journal_t *j);
/*
* Get the first and last addressable serial number in the journal.
*/
dns_result_t
dns_journal_iter_init(dns_journal_t *j,
isc_uint32_t begin_serial, isc_uint32_t end_serial);
/*
* Prepare to iterate over the transactions that will bring the database
* from SOA serial number 'begin_serial' to 'end_serial'.
*
* Returns:
* DNS_R_SUCCESS
* DNS_R_NOTFOUND begin_serial is within the range of adressable
* serial numbers covered by the journal, but
* this particular serial number does not exist.
* DNS_R_RANGE begin_serial is outside the addressable range.
*/
dns_result_t dns_journal_first_rr(dns_journal_t *j);
dns_result_t dns_journal_next_rr(dns_journal_t *j);
/*
* Position the iterator at the first/next RR in a journal
* transaction sequence established using dns_journal_iter_init().
*
* Requires:
* dns_journal_iter_init() has been called.
*
*/
void dns_journal_current_rr(dns_journal_t *j, dns_name_t **name,
isc_uint32_t *ttl, dns_rdata_t **rdata);
/*
* Get the name, ttl, and rdata of the current journal RR.
*
* Requires:
* The last call to dns_journal_first_rr() or dns_journal_next_rr()
* returned DNS_R_SUCCESS.
*/
/**************************************************************************/
/*
* Database roll-forward.
*/
dns_result_t
dns_journal_rollforward(isc_mem_t *mctx, dns_db_t *db, char *filename);
/*
* Roll forward (play back) the journal file "filename" into the
* database "db". This should be called when the server starts
* after a shutdown or crash.
*
* Requires:
* 'mctx' is a valid memory context.
* 'db' is a valid database which does not have a version
* open for writing.
* 'filename' is the name of the journal file belonging to 'db'.
*
*/
ISC_LANG_ENDDECLS
#endif /* DNS_JOURNAL_H */

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