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| -rw-r--r-- | lib/dns/include/dns/diff.h | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/lib/dns/include/dns/diff.h b/lib/dns/include/dns/diff.h new file mode 100644 index 0000000..50f6e9d --- /dev/null +++ b/lib/dns/include/dns/diff.h @@ -0,0 +1,279 @@ +/* + * Copyright (C) Internet Systems Consortium, Inc. ("ISC") + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * See the COPYRIGHT file distributed with this work for additional + * information regarding copyright ownership. + */ + + +#ifndef DNS_DIFF_H +#define DNS_DIFF_H 1 + +/***** + ***** Module Info + *****/ + +/*! \file dns/diff.h + * \brief + * A diff is a convenience type representing a list of changes to be + * made to a database. + */ + +/*** + *** Imports + ***/ + +#include <isc/lang.h> +#include <isc/magic.h> + +#include <dns/name.h> +#include <dns/rdata.h> +#include <dns/types.h> + +/*** + *** Types + ***/ + +/*% + * 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 significant + * even for deletions, because a deletion/addition pair cannot + * be canceled out if the TTL differs (it might be an explicit + * TTL update). + * + * Tuples are also used to represent complete RRs with owner + * names for a couple of other purposes, such as the + * individual RRs of a "RRset exists (value dependent)" + * prerequisite set. In this case, op==DNS_DIFFOP_EXISTS, + * and the TTL is ignored. + * + * DNS_DIFFOP_*RESIGN will cause the 'resign' attribute of the resulting + * RRset to be recomputed to be 'resign' seconds before the earliest RRSIG + * timeexpire. + */ + +typedef enum { + DNS_DIFFOP_ADD = 0, /*%< Add an RR. */ + DNS_DIFFOP_DEL = 1, /*%< Delete an RR. */ + DNS_DIFFOP_EXISTS = 2, /*%< Assert RR existence. */ + DNS_DIFFOP_ADDRESIGN = 4, /*%< ADD + RESIGN. */ + DNS_DIFFOP_DELRESIGN = 5 /*%< DEL + RESIGN. */ +} dns_diffop_t; + +typedef struct dns_difftuple dns_difftuple_t; + +#define DNS_DIFFTUPLE_MAGIC ISC_MAGIC('D','I','F','T') +#define DNS_DIFFTUPLE_VALID(t) ISC_MAGIC_VALID(t, DNS_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 DNS_DIFF_MAGIC ISC_MAGIC('D','I','F','F') +#define DNS_DIFF_VALID(t) ISC_MAGIC_VALID(t, DNS_DIFF_MAGIC) + +struct dns_diff { + unsigned int magic; + isc_mem_t * mctx; + ISC_LIST(dns_difftuple_t) tuples; +}; + +/* Type of comparison function for sorting diffs. */ +typedef int dns_diff_compare_func(const void *, const void *); + +/*** + *** Functions + ***/ + +ISC_LANG_BEGINDECLS + +/**************************************************************************/ +/* + * Manipulation of diffs and tuples. + */ + +isc_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: + *\li *tp != NULL && *tp == NULL. + * + * Returns: + *\li ISC_R_SUCCESS + * \li ISC_R_NOMEMORY + */ + +void +dns_difftuple_free(dns_difftuple_t **tp); +/*%< + * Free a tuple. + * + * Requires: + * \li **tp is a valid tuple. + * + * Ensures: + * \li *tp == NULL + * \li All memory used by the tuple is freed. + */ + +isc_result_t +dns_difftuple_copy(dns_difftuple_t *orig, dns_difftuple_t **copyp); +/*%< + * Copy a tuple. + * + * Requires: + * \li 'orig' points to a valid tuple + *\li copyp != NULL && *copyp == NULL + */ + +void +dns_diff_init(isc_mem_t *mctx, dns_diff_t *diff); +/*%< + * Initialize a diff. + * + * Requires: + * \li 'diff' points to an uninitialized dns_diff_t + * \li allocated by the caller. + * + * Ensures: + * \li '*diff' is a valid, empty diff. + */ + +void +dns_diff_clear(dns_diff_t *diff); +/*%< + * Clear a diff, destroying all its tuples. + * + * Requires: + * \li 'diff' points to a valid dns_diff_t. + * + * Ensures: + * \li 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: + * \li 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. + * + *\li 'diff' is a valid diff. + * \li '*tuple' is a valid tuple. + * + * Ensures: + *\li *tuple is NULL. + *\li 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: + *\li 'diff' is a minimal diff. + * + * Ensures: + *\li 'diff' is still a minimal diff. + * \li *tuple is NULL. + * \li The tuple has been freed, or will be freed when the diff is cleared. + * + */ + +isc_result_t +dns_diff_sort(dns_diff_t *diff, dns_diff_compare_func *compare); +/*%< + * Sort 'diff' in-place according to the comparison function 'compare'. + */ + +isc_result_t +dns_diff_apply(dns_diff_t *diff, dns_db_t *db, dns_dbversion_t *ver); +isc_result_t +dns_diff_applysilently(dns_diff_t *diff, dns_db_t *db, dns_dbversion_t *ver); +/*%< + * Apply 'diff' to the database 'db'. + * + * dns_diff_apply() logs warnings about updates with no effect or + * with inconsistent TTLs; dns_diff_applysilently() does not. + * + * For efficiency, the diff should be sorted by owner name. + * If it is not sorted, operation will still be correct, + * but less efficient. + * + * Requires: + *\li *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. + * + */ + +isc_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: + *\li 'addfunc' is a valid dns_addradatasetfunc_t obtained from + * dns_db_beginload() + * + *\li 'add_private' points to a corresponding dns_dbload_t * + * (XXX why is it a void pointer, then?) + */ + +isc_result_t +dns_diff_print(dns_diff_t *diff, FILE *file); + +/*%< + * Print the differences to 'file' or if 'file' is NULL via the + * logging system. + * + * Require: + *\li 'diff' to be valid. + *\li 'file' to refer to a open file or NULL. + * + * Returns: + *\li #ISC_R_SUCCESS + *\li #ISC_R_NOMEMORY + *\li #ISC_R_UNEXPECTED + *\li any error from dns_rdataset_totext() + */ + +ISC_LANG_ENDDECLS + +#endif /* DNS_DIFF_H */ |