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bind9/bin/named/update.c
Andreas Gustafsson de389382be when doing the automatic SOA serial update following a dynamic 
update, delete the old SOA then add the updated one instead of the other way around
(otherwise the new database singleton type rules will cause the add to fail)
2000-11-22 02:49:57 +00:00

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/*
* Copyright (C) 1999, 2000 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.
*/
/* $Id: update.c,v 1.74 2000/11/22 02:49:57 gson Exp $ */
#include <config.h>
#include <isc/string.h>
#include <isc/taskpool.h>
#include <isc/util.h>
#include <dns/db.h>
#include <dns/dbiterator.h>
#include <dns/dnssec.h>
#include <dns/events.h>
#include <dns/fixedname.h>
#include <dns/journal.h>
#include <dns/message.h>
#include <dns/nxt.h>
#include <dns/rdataset.h>
#include <dns/rdatasetiter.h>
#include <dns/ssu.h>
#include <dns/view.h>
#include <dns/zone.h>
#include <dns/zt.h>
#include <named/client.h>
#include <named/log.h>
#include <named/update.h>
/*
* This module implements dynamic update as in RFC2136.
*/
/*
XXX TODO:
- document strict minimality
*/
/**************************************************************************/
/*
* Convenience macro of common isc_log_write() arguments
* to use in reportings server errors.
*/
#define UPDATE_ERROR_LOGARGS \
ns_g_lctx, NS_LOGCATEGORY_UPDATE, NS_LOGMODULE_UPDATE, \
ISC_LOG_ERROR
/*
* Convenience macro of common isc_log_write() arguments
* to use in tracing dynamic update protocol requests.
*/
#define UPDATE_PROTOCOL_LOGARGS \
ns_g_lctx, NS_LOGCATEGORY_UPDATE, NS_LOGMODULE_UPDATE, \
ISC_LOG_INFO
/*
* Convenience macro of common isc_log_write() arguments
* to use in low-level debug tracing.
*/
#define UPDATE_DEBUG_LOGARGS \
ns_g_lctx, NS_LOGCATEGORY_UPDATE, NS_LOGMODULE_UPDATE, \
ISC_LOG_DEBUG(8)
/*
* Check an operation for failure. These macros all assume that
* the function using them has a 'result' variable and a 'failure'
* label.
*/
#define CHECK(op) \
do { result = (op); \
if (result != ISC_R_SUCCESS) goto failure; \
} while (0)
/*
* Fail unconditionally with result 'code', which must not
* be ISC_R_SUCCESS. The reason for failure presumably has
* been logged already.
*
* The test against ISC_R_SUCCESS is there to keep the Solaris compiler
* from complaining about "end-of-loop code not reached".
*/
#define FAIL(code) \
do { \
result = (code); \
if (result != ISC_R_SUCCESS) goto failure; \
} while (0)
/*
* Fail unconditionally and log as a client error.
* The test against ISC_R_SUCCESS is there to keep the Solaris compiler
* from complaining about "end-of-loop code not reached".
*/
#define FAILC(code, msg) \
do { \
result = (code); \
isc_log_write(UPDATE_PROTOCOL_LOGARGS, \
"dynamic update failed: %s (%s)", \
msg, isc_result_totext(result)); \
if (result != ISC_R_SUCCESS) goto failure; \
} while (0)
/*
* Fail unconditionally and log as a server error.
* The test against ISC_R_SUCCESS is there to keep the Solaris compiler
* from complaining about "end-of-loop code not reached".
*/
#define FAILS(code, msg) \
do { \
result = (code); \
isc_log_write(UPDATE_PROTOCOL_LOGARGS, \
"dynamic update error: %s: %s", \
msg, isc_result_totext(result)); \
if (result != ISC_R_SUCCESS) goto failure; \
} while (0)
/**************************************************************************/
typedef struct rr rr_t;
struct rr {
/* dns_name_t name; */
isc_uint32_t ttl;
dns_rdata_t rdata;
};
typedef struct update_event update_event_t;
struct update_event {
ISC_EVENT_COMMON(update_event_t);
dns_zone_t *zone;
isc_result_t result;
};
/**************************************************************************/
/*
* Forward declarations.
*/
static void update_action(isc_task_t *task, isc_event_t *event);
static void updatedone_action(isc_task_t *task, isc_event_t *event);
static isc_result_t send_forward_event(ns_client_t *client, dns_zone_t *zone);
/**************************************************************************/
/*
* Update a single RR in version 'ver' of 'db' and log the
* update in 'diff'.
*
* Ensures:
* '*tuple' == NULL. Either the tuple is freed, or its
* ownership has been transferred to the diff.
*/
static isc_result_t
do_one_tuple(dns_difftuple_t **tuple,
dns_db_t *db, dns_dbversion_t *ver,
dns_diff_t *diff)
{
dns_diff_t temp_diff;
isc_result_t result;
/*
* Create a singleton diff.
*/
dns_diff_init(diff->mctx, &temp_diff);
ISC_LIST_APPEND(temp_diff.tuples, *tuple, link);
/*
* Apply it to the database.
*/
result = dns_diff_apply(&temp_diff, db, ver);
ISC_LIST_UNLINK(temp_diff.tuples, *tuple, link);
if (result != ISC_R_SUCCESS) {
dns_difftuple_free(tuple);
return (result);
}
/*
* Merge it into the current pending journal entry.
*/
dns_diff_appendminimal(diff, tuple);
/*
* Do not clear temp_diff.
*/
return (ISC_R_SUCCESS);
}
static isc_result_t
update_one_rr(dns_db_t *db, dns_dbversion_t *ver, dns_diff_t *diff,
dns_diffop_t op, dns_name_t *name,
dns_ttl_t ttl, dns_rdata_t *rdata)
{
dns_difftuple_t *tuple = NULL;
isc_result_t result;
result = dns_difftuple_create(diff->mctx, op,
name, ttl, rdata, &tuple);
if (result != ISC_R_SUCCESS)
return (result);
return (do_one_tuple(&tuple, db, ver, diff));
}
/**************************************************************************/
/*
* Callback-style iteration over rdatasets and rdatas.
*
* foreach_rrset() can be used to iterate over the RRsets
* of a name and call a callback function with each
* one. Similarly, foreach_rr() can be used to iterate
* over the individual RRs at name, optionally restricted
* to RRs of a given type.
*
* The callback functions are called "actions" and take
* two arguments: a void pointer for passing arbitrary
* context information, and a pointer to the current RRset
* or RR. By convention, their names end in "_action".
*/
/*
* XXXRTH We might want to make this public somewhere in libdns.
*/
/*
* Function type for foreach_rrset() iterator actions.
*/
typedef isc_result_t rrset_func(void *data, dns_rdataset_t *rrset);
/*
* Function type for foreach_rr() iterator actions.
*/
typedef isc_result_t rr_func(void *data, rr_t *rr);
/*
* Internal context struct for foreach_node_rr().
*/
typedef struct {
rr_func * rr_action;
void * rr_action_data;
} foreach_node_rr_ctx_t;
/*
* Internal helper function for foreach_node_rr().
*/
static isc_result_t
foreach_node_rr_action(void *data, dns_rdataset_t *rdataset) {
isc_result_t result;
foreach_node_rr_ctx_t *ctx = data;
for (result = dns_rdataset_first(rdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(rdataset))
{
rr_t rr = { 0, DNS_RDATA_INIT };
dns_rdataset_current(rdataset, &rr.rdata);
rr.ttl = rdataset->ttl;
result = (*ctx->rr_action)(ctx->rr_action_data, &rr);
if (result != ISC_R_SUCCESS)
return (result);
}
if (result != ISC_R_NOMORE)
return (result);
return (ISC_R_SUCCESS);
}
/*
* For each rdataset of 'name' in 'ver' of 'db', call 'action'
* with the rdataset and 'action_data' as arguments. If the name
* does not exist, do nothing.
*
* If 'action' returns an error, abort iteration and return the error.
*/
static isc_result_t
foreach_rrset(dns_db_t *db,
dns_dbversion_t *ver,
dns_name_t *name,
rrset_func *action,
void *action_data)
{
isc_result_t result;
dns_dbnode_t *node;
dns_rdatasetiter_t *iter;
node = NULL;
result = dns_db_findnode(db, name, ISC_FALSE, &node);
if (result == ISC_R_NOTFOUND)
return (ISC_R_SUCCESS);
if (result != ISC_R_SUCCESS)
return (result);
iter = NULL;
result = dns_db_allrdatasets(db, node, ver,
(isc_stdtime_t) 0, &iter);
if (result != ISC_R_SUCCESS)
goto cleanup_node;
for (result = dns_rdatasetiter_first(iter);
result == ISC_R_SUCCESS;
result = dns_rdatasetiter_next(iter))
{
dns_rdataset_t rdataset;
dns_rdataset_init(&rdataset);
dns_rdatasetiter_current(iter, &rdataset);
result = (*action)(action_data, &rdataset);
dns_rdataset_disassociate(&rdataset);
if (result != ISC_R_SUCCESS)
goto cleanup_iterator;
}
if (result == ISC_R_NOMORE)
result = ISC_R_SUCCESS;
cleanup_iterator:
dns_rdatasetiter_destroy(&iter);
cleanup_node:
dns_db_detachnode(db, &node);
return (result);
}
/*
* For each RR of 'name' in 'ver' of 'db', call 'action'
* with the RR and 'action_data' as arguments. If the name
* does not exist, do nothing.
*
* If 'action' returns an error, abort iteration
* and return the error.
*/
static isc_result_t
foreach_node_rr(dns_db_t *db,
dns_dbversion_t *ver,
dns_name_t *name,
rr_func *rr_action,
void *rr_action_data)
{
foreach_node_rr_ctx_t ctx;
ctx.rr_action = rr_action;
ctx.rr_action_data = rr_action_data;
return (foreach_rrset(db, ver, name,
foreach_node_rr_action, &ctx));
}
/*
* For each of the RRs specified by 'db', 'ver', 'name', 'type',
* (which can be dns_rdatatype_any to match any type), and 'covers', call
* 'action' with the RR and 'action_data' as arguments. If the name
* does not exist, or if no RRset of the given type exists at the name,
* do nothing.
*
* If 'action' returns an error, abort iteration and return the error.
*/
static isc_result_t
foreach_rr(dns_db_t *db,
dns_dbversion_t *ver,
dns_name_t *name,
dns_rdatatype_t type,
dns_rdatatype_t covers,
rr_func *rr_action,
void *rr_action_data)
{
isc_result_t result;
dns_dbnode_t *node;
dns_rdataset_t rdataset;
if (type == dns_rdatatype_any)
return (foreach_node_rr(db, ver, name,
rr_action, rr_action_data));
node = NULL;
result = dns_db_findnode(db, name, ISC_FALSE, &node);
if (result == ISC_R_NOTFOUND)
return (ISC_R_SUCCESS);
if (result != ISC_R_SUCCESS)
return (result);
dns_rdataset_init(&rdataset);
result = dns_db_findrdataset(db, node, ver, type, covers,
(isc_stdtime_t) 0, &rdataset, NULL);
if (result == ISC_R_NOTFOUND) {
result = ISC_R_SUCCESS;
goto cleanup_node;
}
if (result != ISC_R_SUCCESS)
goto cleanup_node;
for (result = dns_rdataset_first(&rdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(&rdataset))
{
rr_t rr = { 0, DNS_RDATA_INIT };
dns_rdataset_current(&rdataset, &rr.rdata);
rr.ttl = rdataset.ttl;
result = (*rr_action)(rr_action_data, &rr);
if (result != ISC_R_SUCCESS)
goto cleanup_rdataset;
}
if (result != ISC_R_NOMORE)
goto cleanup_rdataset;
result = ISC_R_SUCCESS;
cleanup_rdataset:
dns_rdataset_disassociate(&rdataset);
cleanup_node:
dns_db_detachnode(db, &node);
return (result);
}
/**************************************************************************/
/*
* Various tests on the database contents (for prerequisites, etc).
*/
/*
* Function type for predicate functions that compare a database RR 'db_rr'
* against an update RR 'update_rr'.
*/
typedef isc_boolean_t rr_predicate(dns_rdata_t *update_rr, dns_rdata_t *db_rr);
/*
* Helper function for rrset_exists().
*/
static isc_result_t
rrset_exists_action(void *data, rr_t *rr) {
UNUSED(data);
UNUSED(rr);
return (ISC_R_EXISTS);
}
/*
* Utility macro for RR existence checking functions.
*
* If the variable 'result' has the value ISC_R_EXISTS or
* ISC_R_SUCCESS, set *exists to ISC_TRUE or ISC_FALSE,
* respectively, and return success.
*
* If 'result' has any other value, there was a failure.
* Return the failure result code and do not set *exists.
*
* This would be more readable as "do { if ... } while(0)",
* but that form generates tons of warnings on Solaris 2.6.
*/
#define RETURN_EXISTENCE_FLAG \
return ((result == ISC_R_EXISTS) ? \
(*exists = ISC_TRUE, ISC_R_SUCCESS) : \
((result == ISC_R_SUCCESS) ? \
(*exists = ISC_FALSE, ISC_R_SUCCESS) : \
result))
/*
* Set '*exists' to true iff an rrset of the given type exists,
* to false otherwise.
*/
static isc_result_t
rrset_exists(dns_db_t *db, dns_dbversion_t *ver,
dns_name_t *name, dns_rdatatype_t type, dns_rdatatype_t covers,
isc_boolean_t *exists)
{
isc_result_t result;
result = foreach_rr(db, ver, name, type, covers,
rrset_exists_action, NULL);
RETURN_EXISTENCE_FLAG;
}
/*
* Helper function for cname_incompatible_rrset_exists.
*/
static isc_result_t
cname_compatibility_action(void *data, dns_rdataset_t *rrset) {
UNUSED(data);
if (rrset->type != dns_rdatatype_cname &&
! dns_rdatatype_isdnssec(rrset->type))
return (ISC_R_EXISTS);
return (ISC_R_SUCCESS);
}
/*
* Check whether there is an rrset incompatible with adding a CNAME RR,
* i.e., anything but another CNAME (which can be replaced) or a
* DNSSEC RR (which can coexist).
*
* If such an incompatible rrset exists, set '*exists' to ISC_TRUE.
* Otherwise, set it to ISC_FALSE.
*/
static isc_result_t
cname_incompatible_rrset_exists(dns_db_t *db, dns_dbversion_t *ver,
dns_name_t *name, isc_boolean_t *exists) {
isc_result_t result;
result = foreach_rrset(db, ver, name,
cname_compatibility_action, NULL);
RETURN_EXISTENCE_FLAG;
}
/*
* Helper function for rr_count().
*/
static isc_result_t
count_rr_action(void *data, rr_t *rr) {
int *countp = data;
UNUSED(rr);
(*countp)++;
return (ISC_R_SUCCESS);
}
/*
* Count the number of RRs of 'type' belonging to 'name' in 'ver' of 'db'.
*/
static isc_result_t
rr_count(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
dns_rdatatype_t type, dns_rdatatype_t covers, int *countp)
{
*countp = 0;
return (foreach_rr(db, ver, name, type, covers,
count_rr_action, countp));
}
/*
* Context struct for matching_rr_exists().
*/
typedef struct {
rr_predicate *predicate;
dns_db_t *db;
dns_dbversion_t *ver;
dns_name_t *name;
dns_rdata_t *update_rr;
} matching_rr_exists_ctx_t;
/*
* Helper function for matching_rr_exists().
*/
static isc_result_t
matching_rr_exists_action(void *data, rr_t *rr) {
matching_rr_exists_ctx_t *ctx = data;
if ((*ctx->predicate)(ctx->update_rr, &rr->rdata))
return (ISC_R_EXISTS);
return (ISC_R_SUCCESS);
}
/*
* Compare the 'update_rr' with all RRs in the RRset specified by 'db',
* 'ver', 'name', and 'type' using 'predicate'. If the predicate returns
* true for at least one of them, set '*exists' to ISC_TRUE. Otherwise,
* set it to ISC_FALSE.
*/
static isc_result_t
matching_rr_exists(rr_predicate *predicate,
dns_db_t *db,
dns_dbversion_t *ver,
dns_name_t *name,
dns_rdatatype_t type,
dns_rdatatype_t covers,
dns_rdata_t *update_rr,
isc_boolean_t *exists)
{
isc_result_t result;
matching_rr_exists_ctx_t ctx;
ctx.predicate = predicate;
ctx.db = db;
ctx.ver = ver;
ctx.name = name;
ctx.update_rr = update_rr;
result = foreach_rr(db, ver, name, type, covers,
matching_rr_exists_action, &ctx);
RETURN_EXISTENCE_FLAG;
}
/*
* Context struct and helper function for name_exists().
*/
static isc_result_t
name_exists_action(void *data, dns_rdataset_t *rrset) {
UNUSED(data);
UNUSED(rrset);
return (ISC_R_EXISTS);
}
/*
* Set '*exists' to true iff the given name exists, to false otherwise.
*/
static isc_result_t
name_exists(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
isc_boolean_t *exists)
{
isc_result_t result;
result = foreach_rrset(db, ver, name,
name_exists_action, NULL);
RETURN_EXISTENCE_FLAG;
}
typedef struct {
dns_name_t *name, *signer;
dns_ssutable_t *table;
} ssu_check_t;
static isc_result_t
ssu_checkrule(void *data, dns_rdataset_t *rrset) {
ssu_check_t *ssuinfo = data;
isc_boolean_t result;
/*
* If we're deleting all records, it's ok to delete SIG and NXT even
* if we're normally not allowed to.
*/
if (rrset->type == dns_rdatatype_sig ||
rrset->type == dns_rdatatype_nxt)
return (ISC_TRUE);
result = dns_ssutable_checkrules(ssuinfo->table, ssuinfo->signer,
ssuinfo->name, rrset->type);
return (result == ISC_TRUE ? ISC_R_SUCCESS : ISC_R_FAILURE);
}
static isc_boolean_t
ssu_checkall(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
dns_ssutable_t *ssutable, dns_name_t *signer)
{
isc_result_t result;
ssu_check_t ssuinfo;
ssuinfo.name = name;
ssuinfo.table = ssutable;
ssuinfo.signer = signer;
result = foreach_rrset(db, ver, name, ssu_checkrule, &ssuinfo);
return (ISC_TF(result == ISC_R_SUCCESS));
}
/**************************************************************************/
/*
* Checking of "RRset exists (value dependent)" prerequisites.
*
* In the RFC2136 section 3.2.5, this is the pseudocode involving
* a variable called "temp", a mapping of <name, type> tuples to rrsets.
*
* Here, we represent the "temp" data structure as (non-minimial) "dns_diff_t"
* where each typle has op==DNS_DIFFOP_EXISTS.
*/
/*
* Append a tuple asserting the existence of the RR with
* 'name' and 'rdata' to 'diff'.
*/
static isc_result_t
temp_append(dns_diff_t *diff, dns_name_t *name, dns_rdata_t *rdata) {
isc_result_t result;
dns_difftuple_t *tuple = NULL;
REQUIRE(DNS_DIFF_VALID(diff));
CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_EXISTS,
name, 0, rdata, &tuple));
ISC_LIST_APPEND(diff->tuples, tuple, link);
failure:
return (result);
}
/*
* Compare two rdatasets represented as sorted lists of tuples.
* All list elements must have the same owner name and type.
* Return ISC_R_SUCCESS if the rdatasets are equal, rcode(dns_rcode_nxrrset)
* if not.
*/
static isc_result_t
temp_check_rrset(dns_difftuple_t *a, dns_difftuple_t *b) {
for (;;) {
if (a == NULL || b == NULL)
break;
INSIST(a->op == DNS_DIFFOP_EXISTS &&
b->op == DNS_DIFFOP_EXISTS);
INSIST(a->rdata.type == b->rdata.type);
INSIST(dns_name_equal(&a->name, &b->name));
if (dns_rdata_compare(&a->rdata, &b->rdata) != 0)
return (DNS_R_NXRRSET);
a = ISC_LIST_NEXT(a, link);
b = ISC_LIST_NEXT(b, link);
}
if (a != NULL || b != NULL)
return (DNS_R_NXRRSET);
return (ISC_R_SUCCESS);
}
/*
* A comparison function defining the sorting order for the entries
* in the "temp" data structure. The major sort key is the owner name,
* followed by the type and rdata.
*/
static int
temp_order(const void *av, const void *bv) {
dns_difftuple_t * const *ap = av;
dns_difftuple_t * const *bp = bv;
dns_difftuple_t *a = *ap;
dns_difftuple_t *b = *bp;
int r;
r = dns_name_compare(&a->name, &b->name);
if (r != 0)
return (r);
r = (b->rdata.type - a->rdata.type);
if (r != 0)
return (r);
r = dns_rdata_compare(&a->rdata, &b->rdata);
return (r);
}
/*
* Check the "RRset exists (value dependent)" prerequisite information
* in 'temp' against the contents of the database 'db'.
*
* Return ISC_R_SUCCESS if the prerequisites are satisfied,
* rcode(dns_rcode_nxrrset) if not.
*/
static isc_result_t
temp_check(isc_mem_t *mctx, dns_diff_t *temp, dns_db_t *db,
dns_dbversion_t *ver)
{
isc_result_t result;
dns_name_t *name;
dns_dbnode_t *node;
dns_difftuple_t *t;
dns_diff_t trash;
/* Exit early if the list is empty (for efficiency only). */
if (ISC_LIST_HEAD(temp->tuples) == NULL)
return (ISC_R_SUCCESS);
/*
* Sort the prerequisite records by owner name,
* type, and rdata.
*/
result = dns_diff_sort(temp, temp_order);
if (result != ISC_R_SUCCESS)
return (result);
dns_diff_init(mctx, &trash);
/*
* For each name and type in the prerequisites,
* construct a sorted rdata list of the corresponding
* database contents, and compare the lists.
*/
t = ISC_LIST_HEAD(temp->tuples);
while (t != NULL) {
name = &t->name;
/* A new unique name begins here. */
node = NULL;
result = dns_db_findnode(db, name, ISC_FALSE, &node);
if (result == ISC_R_NOTFOUND)
return (DNS_R_NXRRSET);
if (result != ISC_R_SUCCESS)
return (result);
/* A new unique type begins here. */
while (t != NULL && dns_name_equal(&t->name, name)) {
dns_rdatatype_t type, covers;
dns_rdataset_t rdataset;
dns_diff_t d_rrs; /* Database RRs with
this name and type */
dns_diff_t u_rrs; /* Update RRs with
this name and type */
type = t->rdata.type;
if (type == dns_rdatatype_sig)
covers = dns_rdata_covers(&t->rdata);
else
covers = 0;
/*
* Collect all database RRs for this name and type
* onto d_rrs and sort them.
*/
dns_rdataset_init(&rdataset);
result = dns_db_findrdataset(db, node, ver, type,
covers, (isc_stdtime_t) 0,
&rdataset, NULL);
if (result != ISC_R_SUCCESS) {
dns_db_detachnode(db, &node);
return (DNS_R_NXRRSET);
}
dns_diff_init(mctx, &d_rrs);
dns_diff_init(mctx, &u_rrs);
for (result = dns_rdataset_first(&rdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(&rdataset))
{
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdataset_current(&rdataset, &rdata);
result = temp_append(&d_rrs, name, &rdata);
if (result != ISC_R_SUCCESS)
goto failure;
}
if (result != ISC_R_NOMORE)
goto failure;
result = dns_diff_sort(&d_rrs, temp_order);
if (result != ISC_R_SUCCESS)
goto failure;
/*
* Collect all update RRs for this name and type
* onto u_rrs. No need to sort them here -
* they are already sorted.
*/
while (t != NULL &&
dns_name_equal(&t->name, name) &&
t->rdata.type == type)
{
dns_difftuple_t *next =
ISC_LIST_NEXT(t, link);
ISC_LIST_UNLINK(temp->tuples, t, link);
ISC_LIST_APPEND(u_rrs.tuples, t, link);
t = next;
}
/* Compare the two sorted lists. */
result = temp_check_rrset(ISC_LIST_HEAD(u_rrs.tuples),
ISC_LIST_HEAD(d_rrs.tuples));
if (result != ISC_R_SUCCESS)
goto failure;
/*
* We are done with the tuples, but we can't free
* them yet because "name" still points into one
* of them. Move them on a temporary list.
*/
ISC_LIST_APPENDLIST(trash.tuples, u_rrs.tuples, link);
ISC_LIST_APPENDLIST(trash.tuples, d_rrs.tuples, link);
dns_rdataset_disassociate(&rdataset);
continue;
failure:
dns_diff_clear(&d_rrs);
dns_diff_clear(&u_rrs);
dns_diff_clear(&trash);
dns_rdataset_disassociate(&rdataset);
dns_db_detachnode(db, &node);
return (result);
}
dns_db_detachnode(db, &node);
}
dns_diff_clear(&trash);
return (ISC_R_SUCCESS);
}
/**************************************************************************/
/*
* Conditional deletion of RRs.
*/
/*
* Context structure for delete_if().
*/
typedef struct {
rr_predicate *predicate;
dns_db_t *db;
dns_dbversion_t *ver;
dns_diff_t *diff;
dns_name_t *name;
dns_rdata_t *update_rr;
} conditional_delete_ctx_t;
/*
* Predicate functions for delete_if().
*/
/*
* Return true iff 'update_rr' is neither a SOA nor an NS RR.
*/
static isc_boolean_t
type_not_soa_nor_ns_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) {
UNUSED(update_rr);
return ((db_rr->type != dns_rdatatype_soa &&
db_rr->type != dns_rdatatype_ns) ?
ISC_TRUE : ISC_FALSE);
}
/*
* Return true always.
*/
static isc_boolean_t
true_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) {
UNUSED(update_rr);
UNUSED(db_rr);
return (ISC_TRUE);
}
/*
* Return true iff the two RRs have identical rdata.
*/
static isc_boolean_t
rr_equal_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) {
/*
* XXXRTH This is not a problem, but we should consider creating
* dns_rdata_equal() (that used dns_name_equal()), since it
* would be faster. Not a priority.
*/
return (dns_rdata_compare(update_rr, db_rr) == 0 ?
ISC_TRUE : ISC_FALSE);
}
/*
* Return true iff 'update_rr' should replace 'db_rr' according
* to the special RFC2136 rules for CNAME, SOA, and WKS records.
*
* RFC2136 does not mention NXT or DNAME, but multiple NXTs or DNAMEs
* make little sense, so we replace those, too.
*/
static isc_boolean_t
replaces_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) {
if (db_rr->type != update_rr->type)
return (ISC_FALSE);
if (db_rr->type == dns_rdatatype_cname)
return (ISC_TRUE);
if (db_rr->type == dns_rdatatype_dname)
return (ISC_TRUE);
if (db_rr->type == dns_rdatatype_soa)
return (ISC_TRUE);
if (db_rr->type == dns_rdatatype_nxt)
return (ISC_TRUE);
if (db_rr->type == dns_rdatatype_wks) {
/*
* Compare the address and protocol fields only. These
* form the first five bytes of the RR data. Do a
* raw binary comparison; unpacking the WKS RRs using
* dns_rdata_tostruct() might be cleaner in some ways,
* but it would require us to pass around an mctx.
*/
INSIST(db_rr->length >= 5 && update_rr->length >= 5);
return (memcmp(db_rr->data, update_rr->data, 5) == 0 ?
ISC_TRUE : ISC_FALSE);
}
return (ISC_FALSE);
}
/*
* Internal helper function for delete_if().
*/
static isc_result_t
delete_if_action(void *data, rr_t *rr) {
conditional_delete_ctx_t *ctx = data;
if ((*ctx->predicate)(ctx->update_rr, &rr->rdata)) {
isc_result_t result;
result = update_one_rr(ctx->db, ctx->ver, ctx->diff,
DNS_DIFFOP_DEL, ctx->name,
rr->ttl, &rr->rdata);
return (result);
} else {
return (ISC_R_SUCCESS);
}
}
/*
* Conditionally delete RRs. Apply 'predicate' to the RRs
* specified by 'db', 'ver', 'name', and 'type' (which can
* be dns_rdatatype_any to match any type). Delete those
* RRs for which the predicate returns true, and log the
* deletions in 'diff'.
*/
static isc_result_t
delete_if(rr_predicate *predicate,
dns_db_t *db,
dns_dbversion_t *ver,
dns_name_t *name,
dns_rdatatype_t type,
dns_rdatatype_t covers,
dns_rdata_t *update_rr,
dns_diff_t *diff)
{
conditional_delete_ctx_t ctx;
ctx.predicate = predicate;
ctx.db = db;
ctx.ver = ver;
ctx.diff = diff;
ctx.name = name;
ctx.update_rr = update_rr;
return (foreach_rr(db, ver, name, type, covers,
delete_if_action, &ctx));
}
/**************************************************************************/
/*
* Miscellaneous subroutines.
*/
/*
* Extract a single update RR from 'section' of dynamic update message
* 'msg', with consistency checking.
*
* Stores the owner name, rdata, and TTL of the update RR at 'name',
* 'rdata', and 'ttl', respectively.
*/
static void
get_current_rr(dns_message_t *msg, dns_section_t section,
dns_rdataclass_t zoneclass,
dns_name_t **name, dns_rdata_t *rdata, dns_rdatatype_t *covers,
dns_ttl_t *ttl,
dns_rdataclass_t *update_class)
{
dns_rdataset_t *rdataset;
isc_result_t result;
dns_message_currentname(msg, section, name);
rdataset = ISC_LIST_HEAD((*name)->list);
INSIST(rdataset != NULL);
INSIST(ISC_LIST_NEXT(rdataset, link) == NULL);
*covers = rdataset->covers;
*ttl = rdataset->ttl;
result = dns_rdataset_first(rdataset);
INSIST(result == ISC_R_SUCCESS);
dns_rdataset_current(rdataset, rdata);
INSIST(dns_rdataset_next(rdataset) == ISC_R_NOMORE);
*update_class = rdata->rdclass;
rdata->rdclass = zoneclass;
}
/*
* Increment the SOA serial number of database 'db', version 'ver'.
* Replace the SOA record in the database, and log the
* change in 'diff'.
*/
/*
* XXXRTH Failures in this routine will be worth logging, when
* we have a logging system. Failure to find the zonename
* or the SOA rdataset warrant at least an UNEXPECTED_ERROR().
*/
static isc_result_t
increment_soa_serial(dns_db_t *db, dns_dbversion_t *ver,
dns_diff_t *diff, isc_mem_t *mctx)
{
dns_difftuple_t *deltuple = NULL;
dns_difftuple_t *addtuple = NULL;
isc_uint32_t serial;
isc_result_t result;
CHECK(dns_db_createsoatuple(db, ver, mctx, DNS_DIFFOP_DEL, &deltuple));
CHECK(dns_difftuple_copy(deltuple, &addtuple));
addtuple->op = DNS_DIFFOP_ADD;
serial = dns_soa_getserial(&addtuple->rdata);
/* RFC1982 */
serial = (serial + 1) & 0xFFFFFFFF;
if (serial == 0)
serial = 1;
dns_soa_setserial(serial, &addtuple->rdata);
CHECK(do_one_tuple(&deltuple, db, ver, diff));
CHECK(do_one_tuple(&addtuple, db, ver, diff));
result = ISC_R_SUCCESS;
failure:
if (addtuple != NULL)
dns_difftuple_free(&addtuple);
if (deltuple != NULL)
dns_difftuple_free(&deltuple);
return (result);
}
/*
* Check that the new SOA record at 'update_rdata' does not
* illegally cause the SOA serial number to decrease or stay
* unchanged relative to the existing SOA in 'db'.
*
* Sets '*ok' to ISC_TRUE if the update is legal, ISC_FALSE if not.
*
* William King points out that RFC2136 is inconsistent about
* the case where the serial number stays unchanged:
*
* section 3.4.2.2 requires a server to ignore a SOA update request
* if the serial number on the update SOA is less_than_or_equal to
* the zone SOA serial.
*
* section 3.6 requires a server to ignore a SOA update request if
* the serial is less_than the zone SOA serial.
*
* Paul says 3.4.2.2 is correct.
*
*/
static isc_result_t
check_soa_increment(dns_db_t *db, dns_dbversion_t *ver,
dns_rdata_t *update_rdata,
isc_boolean_t *ok)
{
isc_uint32_t db_serial;
isc_uint32_t update_serial;
isc_result_t result;
update_serial = dns_soa_getserial(update_rdata);
result = dns_db_getsoaserial(db, ver, &db_serial);
if (result != ISC_R_SUCCESS)
return (result);
if (DNS_SERIAL_GE(db_serial, update_serial)) {
*ok = ISC_FALSE;
} else {
*ok = ISC_TRUE;
}
return (ISC_R_SUCCESS);
}
/**************************************************************************/
/*
* Incremental updating of NXTs and SIGs.
*/
#define MAXZONEKEYS 32 /* Maximum number of zone keys supported. */
/*
* We abuse the dns_diff_t type to represent a set of domain names
* affected by the update.
*/
static isc_result_t
namelist_append_name(dns_diff_t *list, dns_name_t *name) {
isc_result_t result;
dns_difftuple_t *tuple = NULL;
static dns_rdata_t dummy_rdata = { NULL, 0, 0, 0, 0,
{ (void*)(-1), (void*)(-1) } };
CHECK(dns_difftuple_create(list->mctx, DNS_DIFFOP_EXISTS, name, 0,
&dummy_rdata, &tuple));
dns_diff_append(list, &tuple);
failure:
return (result);
}
static isc_result_t
namelist_append_subdomain(dns_db_t *db, dns_name_t *name, dns_diff_t *affected)
{
isc_result_t result;
dns_fixedname_t fixedname;
dns_name_t *child;
dns_dbiterator_t *dbit = NULL;
dns_fixedname_init(&fixedname);
child = dns_fixedname_name(&fixedname);
CHECK(dns_db_createiterator(db, ISC_FALSE, &dbit));
for (result = dns_dbiterator_seek(dbit, name);
result == ISC_R_SUCCESS;
result = dns_dbiterator_next(dbit))
{
dns_dbnode_t *node = NULL;
result = dns_dbiterator_current(dbit, &node, child);
dns_db_detachnode(db, &node);
CHECK(result);
if (! dns_name_issubdomain(child, name))
break;
CHECK(namelist_append_name(affected, child));
}
failure:
if (dbit != NULL)
dns_dbiterator_destroy(&dbit);
return (result);
}
/*
* Helper function for non_nxt_rrset_exists().
*/
static isc_result_t
is_non_nxt_action(void *data, dns_rdataset_t *rrset) {
UNUSED(data);
if (!(rrset->type == dns_rdatatype_nxt ||
(rrset->type == dns_rdatatype_sig &&
rrset->covers == dns_rdatatype_nxt)))
return (ISC_R_EXISTS);
return (ISC_R_SUCCESS);
}
/*
* Check whether there is an rrset other than a NXT or SIG NXT,
* i.e., anything that justifies the continued existence of a name
* after a secure update.
*
* If such an rrset exists, set '*exists' to ISC_TRUE.
* Otherwise, set it to ISC_FALSE.
*/
static isc_result_t
non_nxt_rrset_exists(dns_db_t *db, dns_dbversion_t *ver,
dns_name_t *name, isc_boolean_t *exists)
{
isc_result_t result;
result = foreach_rrset(db, ver, name,
is_non_nxt_action, NULL);
RETURN_EXISTENCE_FLAG;
}
/*
* A comparison function for sorting dns_diff_t:s by name.
*/
static int
name_order(const void *av, const void *bv) {
dns_difftuple_t * const *ap = av;
dns_difftuple_t * const *bp = bv;
dns_difftuple_t *a = *ap;
dns_difftuple_t *b = *bp;
return (dns_name_compare(&a->name, &b->name));
}
static isc_result_t
uniqify_name_list(dns_diff_t *list) {
isc_result_t result;
dns_difftuple_t *p, *q;
CHECK(dns_diff_sort(list, name_order));
p = ISC_LIST_HEAD(list->tuples);
while (p != NULL) {
do {
q = ISC_LIST_NEXT(p, link);
if (q == NULL || ! dns_name_equal(&p->name, &q->name))
break;
ISC_LIST_UNLINK(list->tuples, q, link);
dns_difftuple_free(&q);
} while (1);
p = ISC_LIST_NEXT(p, link);
}
failure:
return (result);
}
static isc_result_t
is_glue(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
isc_boolean_t *flag)
{
isc_result_t result;
dns_fixedname_t foundname;
dns_fixedname_init(&foundname);
result = dns_db_find(db, name, ver, dns_rdatatype_any,
DNS_DBFIND_GLUEOK | DNS_DBFIND_NOWILD,
(isc_stdtime_t) 0, NULL,
dns_fixedname_name(&foundname),
NULL, NULL);
if (result == ISC_R_SUCCESS) {
*flag = ISC_FALSE;
return (ISC_R_SUCCESS);
} else if (result == DNS_R_ZONECUT) {
/*
* We are at the zonecut. The name will have an NXT, but
* non-delegation will be omitted from the type bit map.
*/
*flag = ISC_FALSE;
return (ISC_R_SUCCESS);
} else if (result == DNS_R_GLUE || result == DNS_R_DNAME) {
*flag = ISC_TRUE;
return (ISC_R_SUCCESS);
} else {
return (result);
}
}
/*
* Find the next/previous name that has a NXT record.
* In other words, skip empty database nodes and names that
* have had their NXTs removed because they are obscured by
* a zone cut.
*/
static isc_result_t
next_active(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *oldname,
dns_name_t *newname, isc_boolean_t forward)
{
isc_result_t result;
dns_dbiterator_t *dbit = NULL;
isc_boolean_t has_nxt;
CHECK(dns_db_createiterator(db, ISC_FALSE, &dbit));
CHECK(dns_dbiterator_seek(dbit, oldname));
do {
dns_dbnode_t *node = NULL;
if (forward)
result = dns_dbiterator_next(dbit);
else
result = dns_dbiterator_prev(dbit);
if (result == ISC_R_NOMORE) {
/*
* Wrap around.
*/
if (forward)
CHECK(dns_dbiterator_first(dbit));
else
CHECK(dns_dbiterator_last(dbit));
}
dns_dbiterator_current(dbit, &node, newname);
dns_db_detachnode(db, &node);
/*
* The iterator may hold the tree lock, and
* rrset_exists() calls dns_db_findnode() which
* may try to reacquire it. To avoid deadlock
* we must pause the iterator first.
*/
CHECK(dns_dbiterator_pause(dbit));
CHECK(rrset_exists(db, ver, newname,
dns_rdatatype_nxt, 0, &has_nxt));
} while (! has_nxt);
failure:
if (dbit != NULL)
dns_dbiterator_destroy(&dbit);
return (result);
}
/*
* Add a NXT record for "name", recording the change in "diff".
*/
static isc_result_t
add_nxt(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, dns_diff_t *diff)
{
isc_result_t result;
dns_dbnode_t *node = NULL;
unsigned char buffer[DNS_NXT_BUFFERSIZE];
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_difftuple_t *tuple = NULL;
dns_fixedname_t fixedname;
dns_name_t *target;
dns_fixedname_init(&fixedname);
target = dns_fixedname_name(&fixedname);
/*
* Find the successor name, aka NXT target.
*/
CHECK(next_active(db, ver, name, target, ISC_TRUE));
/*
* Create the NXT RDATA.
*/
CHECK(dns_db_findnode(db, name, ISC_FALSE, &node));
dns_rdata_init(&rdata);
CHECK(dns_nxt_buildrdata(db, ver, node, target, buffer, &rdata));
dns_db_detachnode(db, &node);
/*
* Create a diff tuple, update the database, and record the change.
*/
CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, name,
3600, /* XXXRTH */
&rdata, &tuple));
CHECK(do_one_tuple(&tuple, db, ver, diff));
INSIST(tuple == NULL);
failure:
if (node != NULL)
dns_db_detachnode(db, &node);
return (result);
}
/*
* Add a placeholder NXT record for "name", recording the change in "diff".
*/
static isc_result_t
add_placeholder_nxt(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
dns_diff_t *diff) {
isc_result_t result;
dns_difftuple_t *tuple = NULL;
isc_region_t r;
unsigned char data[1] = { 0 }; /* The root domain, no bits. */
dns_rdata_t rdata = DNS_RDATA_INIT;
r.base = data;
r.length = sizeof data;
dns_rdata_fromregion(&rdata, dns_db_class(db), dns_rdatatype_nxt, &r);
CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, name, 0,
&rdata, &tuple));
CHECK(do_one_tuple(&tuple, db, ver, diff));
failure:
return (result);
}
static isc_result_t
find_zone_keys(dns_db_t *db, dns_dbversion_t *ver, isc_mem_t *mctx,
unsigned int maxkeys, dst_key_t **keys, unsigned int *nkeys)
{
isc_result_t result;
dns_dbnode_t *node = NULL;
CHECK(dns_db_findnode(db, dns_db_origin(db), ISC_FALSE, &node));
CHECK(dns_dnssec_findzonekeys(db, ver, node, dns_db_origin(db),
mctx, maxkeys, keys, nkeys));
failure:
if (node != NULL)
dns_db_detachnode(db, &node);
return (result);
}
/*
* Add SIG records for an RRset, recording the change in "diff".
*/
static isc_result_t
add_sigs(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
dns_rdatatype_t type, dns_diff_t *diff, dst_key_t **keys,
unsigned int nkeys, isc_mem_t *mctx, isc_stdtime_t inception,
isc_stdtime_t expire)
{
isc_result_t result;
dns_dbnode_t *node = NULL;
dns_rdataset_t rdataset;
dns_rdata_t sig_rdata = DNS_RDATA_INIT;
isc_buffer_t buffer;
unsigned char data[1024]; /* XXX */
unsigned int i;
dns_rdataset_init(&rdataset);
isc_buffer_init(&buffer, data, sizeof(data));
/* Get the rdataset to sign. */
CHECK(dns_db_findnode(db, name, ISC_FALSE, &node));
CHECK(dns_db_findrdataset(db, node, ver, type, 0,
(isc_stdtime_t) 0,
&rdataset, NULL));
dns_db_detachnode(db, &node);
for (i = 0; i < nkeys; i++) {
/* Calculate the signature, creating a SIG RDATA. */
CHECK(dns_dnssec_sign(name, &rdataset, keys[i],
&inception, &expire,
mctx, &buffer, &sig_rdata));
/* Update the database and journal with the SIG. */
/* XXX inefficient - will cause dataset merging */
CHECK(update_one_rr(db, ver, diff, DNS_DIFFOP_ADD, name,
rdataset.ttl, &sig_rdata));
dns_rdata_reset(&sig_rdata);
}
failure:
if (dns_rdataset_isassociated(&rdataset))
dns_rdataset_disassociate(&rdataset);
if (node != NULL)
dns_db_detachnode(db, &node);
return (result);
}
/*
* Update SIG and NXT records affected by an update. The original
* update, including the SOA serial update but exluding the SIG & NXT
* changes, is in "diff" and has already been applied to "newver" of "db".
* The database version prior to the update is "oldver".
*
* The necessary SIG and NXT changes will be applied to "newver"
* and added (as a minimal diff) to "diff".
*
* The SIGs generated will be valid for 'sigvalidityinterval' seconds.
*/
static isc_result_t
update_signatures(isc_mem_t *mctx, dns_db_t *db, dns_dbversion_t *oldver,
dns_dbversion_t *newver, dns_diff_t *diff,
isc_uint32_t sigvalidityinterval)
{
isc_result_t result;
dns_difftuple_t *t;
dns_diff_t diffnames;
dns_diff_t affected;
dns_diff_t sig_diff;
dns_diff_t nxt_diff;
dns_diff_t nxt_mindiff;
isc_boolean_t flag;
dst_key_t *zone_keys[MAXZONEKEYS];
unsigned int nkeys = 0;
unsigned int i;
isc_stdtime_t now, inception, expire;
dns_diff_init(mctx, &diffnames);
dns_diff_init(mctx, &affected);
dns_diff_init(mctx, &sig_diff);
dns_diff_init(mctx, &nxt_diff);
dns_diff_init(mctx, &nxt_mindiff);
result = find_zone_keys(db, newver, mctx,
MAXZONEKEYS, zone_keys, &nkeys);
if (result != ISC_R_SUCCESS) {
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_UPDATE,
NS_LOGMODULE_UPDATE, ISC_LOG_ERROR,
"could not get zone keys for secure "
"dynamic update");
goto failure;
}
isc_stdtime_get(&now);
inception = now - 3600; /* Allow for some clock skew. */
expire = now + sigvalidityinterval;
/*
* Find all RRsets directly affected by the update, and
* update their SIGs. Also build a list of names affected
* by the update in "diffnames".
*/
CHECK(dns_diff_sort(diff, temp_order));
t = ISC_LIST_HEAD(diff->tuples);
while (t != NULL) {
dns_name_t *name = &t->name;
/* Now "name" is a new, unique name affected by the update. */
CHECK(namelist_append_name(&diffnames, name));
while (t != NULL && dns_name_equal(&t->name, name)) {
dns_rdatatype_t type;
type = t->rdata.type;
/*
* Now "name" and "type" denote a new unique RRset
* affected by the update.
*/
/* Don't sign SIGs. */
if (type == dns_rdatatype_sig)
goto skip;
/*
* Delete all old SIGs covering this type, since they
* are all invalid when the signed RRset has changed.
* We may not be able to recreate all of them - tough.
*/
CHECK(delete_if(true_p, db, newver, name,
dns_rdatatype_sig, type,
NULL, &sig_diff));
/*
* If this RRset still exists after the update,
* add a new signature for it.
*/
CHECK(rrset_exists(db, newver, name, type, 0, &flag));
if (flag) {
CHECK(add_sigs(db, newver, name, type,
&sig_diff, zone_keys, nkeys,
mctx, inception, expire));
}
skip:
/* Skip any other updates to the same RRset. */
while (t != NULL &&
dns_name_equal(&t->name, name) &&
t->rdata.type == type)
{
t = ISC_LIST_NEXT(t, link);
}
}
}
/* Remove orphaned NXTs and SIG NXTs. */
for (t = ISC_LIST_HEAD(diffnames.tuples);
t != NULL;
t = ISC_LIST_NEXT(t, link))
{
CHECK(non_nxt_rrset_exists(db, newver, &t->name, &flag));
if (! flag) {
CHECK(delete_if(true_p, db, newver, &t->name,
dns_rdatatype_any, 0,
NULL, &sig_diff));
}
}
/*
* When a name is created or deleted, its predecessor needs to
* have its NXT updated.
*/
for (t = ISC_LIST_HEAD(diffnames.tuples);
t != NULL;
t = ISC_LIST_NEXT(t, link))
{
isc_boolean_t existed, exists;
dns_fixedname_t fixedname;
dns_name_t *prevname;
dns_fixedname_init(&fixedname);
prevname = dns_fixedname_name(&fixedname);
CHECK(name_exists(db, oldver, &t->name, &existed));
CHECK(name_exists(db, newver, &t->name, &exists));
if (exists == existed)
continue;
/*
* Find the predecessor.
* When names become obscured or unobscured in this update
* transaction, we may find the wrong predecessor because
* the NXTs have not yet been updated to reflect the delegation
* change. This should not matter because in this case,
* the correct predecessor is either the delegation node or
* a newly unobscured node, and those nodes are on the
* "affected" list in any case.
*/
CHECK(next_active(db, newver, &t->name, prevname, ISC_FALSE));
CHECK(namelist_append_name(&affected, prevname));
}
/*
* Find names potentially affected by delegation changes
* (obscured by adding an NS or DNAME, or unobscured by
* removing one).
*/
for (t = ISC_LIST_HEAD(diffnames.tuples);
t != NULL;
t = ISC_LIST_NEXT(t, link))
{
isc_boolean_t ns_existed, dname_existed;
isc_boolean_t ns_exists, dname_exists;
CHECK(rrset_exists(db, oldver, &t->name, dns_rdatatype_ns, 0,
&ns_existed));
CHECK(rrset_exists(db, oldver, &t->name, dns_rdatatype_dname, 0,
&dname_existed));
CHECK(rrset_exists(db, newver, &t->name, dns_rdatatype_ns, 0,
&ns_exists));
CHECK(rrset_exists(db, newver, &t->name, dns_rdatatype_dname, 0,
&dname_exists));
if ((ns_exists || dname_exists) == (ns_existed || dname_existed))
continue;
/*
* There was a delegation change. Mark all subdomains
* of t->name as potentially needing a NXT update.
*/
CHECK(namelist_append_subdomain(db, &t->name, &affected));
}
ISC_LIST_APPENDLIST(affected.tuples, diffnames.tuples, link);
INSIST(ISC_LIST_EMPTY(diffnames.tuples));
CHECK(uniqify_name_list(&affected));
/*
* Determine which names should have NXTs, and delete/create
* NXTs to make it so. We don't know the final NXT targets yet,
* so we just create placeholder NXTs with arbitrary contents
* to indicate that their respective owner names should be part of
* the NXT chain.
*/
for (t = ISC_LIST_HEAD(affected.tuples);
t != NULL;
t = ISC_LIST_NEXT(t, link))
{
isc_boolean_t exists;
CHECK(name_exists(db, newver, &t->name, &exists));
if (! exists)
continue;
CHECK(is_glue(db, newver, &t->name, &flag));
if (flag) {
/*
* This name is obscured. Delete any
* existing NXT record.
*/
CHECK(delete_if(true_p, db, newver, &t->name,
dns_rdatatype_nxt, 0,
NULL, &nxt_diff));
} else {
/*
* This name is not obscured. It should have a NXT.
*/
CHECK(rrset_exists(db, newver, &t->name,
dns_rdatatype_nxt, 0, &flag));
if (! flag) {
add_placeholder_nxt(db, newver, &t->name,
diff);
}
}
}
/*
* Now we know which names are part of the NXT chain.
* Make them all point at their correct targets.
*/
for (t = ISC_LIST_HEAD(affected.tuples);
t != NULL;
t = ISC_LIST_NEXT(t, link))
{
CHECK(rrset_exists(db, newver, &t->name,
dns_rdatatype_nxt, 0, &flag));
if (flag) {
/*
* There is a NXT, but we don't know if it is correct.
* Delete it and create a correct one to be sure.
* If the update was unnecessary, the diff minimization
* will take care of eliminating it from the journal,
* IXFRs, etc.
*
* The SIG bit should always be set in the NXTs
* we generate, because they will all get SIG NXTs.
* (XXX what if the zone keys are missing?).
* Because the SIG NXTs have not necessarily been
* created yet, the correctness of the bit mask relies
* on the assumption that NXTs are only created if
* there is other data, and if there is other data,
* there are other SIGs.
*/
CHECK(delete_if(true_p, db, newver, &t->name,
dns_rdatatype_nxt, 0,
NULL, &nxt_diff));
CHECK(add_nxt(db, newver, &t->name, &nxt_diff));
}
}
/*
* Minimize the set of NXT updates so that we don't
* have to regenerate the SIG NXTs for NXTs that were
* replaced with identical ones.
*/
while ((t = ISC_LIST_HEAD(nxt_diff.tuples)) != NULL) {
ISC_LIST_UNLINK(nxt_diff.tuples, t, link);
dns_diff_appendminimal(&nxt_mindiff, &t);
}
/* Update SIG NXTs. */
for (t = ISC_LIST_HEAD(nxt_mindiff.tuples);
t != NULL;
t = ISC_LIST_NEXT(t, link))
{
if (t->op == DNS_DIFFOP_DEL) {
CHECK(delete_if(true_p, db, newver, &t->name,
dns_rdatatype_sig, dns_rdatatype_nxt,
NULL, &sig_diff));
} else if (t->op == DNS_DIFFOP_ADD) {
CHECK(add_sigs(db, newver, &t->name, dns_rdatatype_nxt,
&sig_diff, zone_keys, nkeys, mctx,
inception, expire));
} else {
INSIST(0);
}
}
/* Record our changes for the journal. */
while ((t = ISC_LIST_HEAD(sig_diff.tuples)) != NULL) {
ISC_LIST_UNLINK(sig_diff.tuples, t, link);
dns_diff_appendminimal(diff, &t);
}
while ((t = ISC_LIST_HEAD(nxt_mindiff.tuples)) != NULL) {
ISC_LIST_UNLINK(nxt_mindiff.tuples, t, link);
dns_diff_appendminimal(diff, &t);
}
INSIST(ISC_LIST_EMPTY(sig_diff.tuples));
INSIST(ISC_LIST_EMPTY(nxt_diff.tuples));
INSIST(ISC_LIST_EMPTY(nxt_mindiff.tuples));
failure:
dns_diff_clear(&sig_diff);
dns_diff_clear(&nxt_diff);
dns_diff_clear(&nxt_mindiff);
dns_diff_clear(&affected);
dns_diff_clear(&diffnames);
for (i = 0; i < nkeys; i++)
dst_key_free(&zone_keys[i]);
return (result);
}
/**************************************************************************/
/*
* The actual update code in all its glory. We try to follow
* the RFC2136 pseudocode as closely as possible.
*/
static isc_result_t
send_update_event(ns_client_t *client, dns_zone_t *zone) {
isc_result_t result = ISC_R_SUCCESS;
update_event_t *event = NULL;
isc_task_t *zonetask = NULL;
ns_client_t *evclient;
event = (update_event_t *)
isc_event_allocate(client->mctx, client, DNS_EVENT_UPDATE,
update_action, NULL, sizeof(*event));
if (event == NULL)
FAIL(ISC_R_NOMEMORY);
event->zone = zone;
event->result = ISC_R_SUCCESS;
evclient = NULL;
ns_client_attach(client, &evclient);
event->ev_arg = evclient;
dns_zone_gettask(zone, &zonetask);
isc_task_send(zonetask, (isc_event_t **)&event);
failure:
if (event != NULL)
isc_event_free((isc_event_t **)&event);
return (result);
}
static void
respond(ns_client_t *client, isc_result_t result) {
isc_result_t msg_result;
msg_result = dns_message_reply(client->message, ISC_TRUE);
if (msg_result != ISC_R_SUCCESS)
goto msg_failure;
client->message->rcode = dns_result_torcode(result);
ns_client_send(client);
return;
msg_failure:
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_UPDATE, NS_LOGMODULE_UPDATE,
ISC_LOG_ERROR,
"could not create update response message: %s",
isc_result_totext(msg_result));
ns_client_next(client, msg_result);
}
void
ns_update_start(ns_client_t *client, isc_result_t sigresult) {
dns_message_t *request = client->message;
isc_result_t result;
dns_name_t *zonename;
dns_rdataset_t *zone_rdataset;
dns_zone_t *zone = NULL;
/*
* Interpret the zone section.
*/
result = dns_message_firstname(request, DNS_SECTION_ZONE);
if (result != ISC_R_SUCCESS)
FAILC(DNS_R_FORMERR,
"update zone section empty");
/*
* The zone section must contain exactly one "question", and
* it must be of type SOA.
*/
zonename = NULL;
dns_message_currentname(request, DNS_SECTION_ZONE, &zonename);
zone_rdataset = ISC_LIST_HEAD(zonename->list);
if (zone_rdataset->type != dns_rdatatype_soa)
FAILC(DNS_R_FORMERR,
"update zone section contains non-SOA");
if (ISC_LIST_NEXT(zone_rdataset, link) != NULL)
FAILC(DNS_R_FORMERR,
"update zone section contains multiple RRs");
/* The zone section must have exactly one name. */
result = dns_message_nextname(request, DNS_SECTION_ZONE);
if (result != ISC_R_NOMORE)
FAILC(DNS_R_FORMERR,
"update zone section contains multiple RRs");
result = dns_zt_find(client->view->zonetable, zonename, 0, NULL,
&zone);
if (result != ISC_R_SUCCESS)
FAILC(DNS_R_NOTAUTH,
"not authoritative for update zone");
switch(dns_zone_gettype(zone)) {
case dns_zone_master:
/*
* We can now fail due to a bad signature as we now know
* that we are the master.
*/
if (sigresult != ISC_R_SUCCESS)
FAIL(sigresult);
CHECK(send_update_event(client, zone));
break; /* OK. */
case dns_zone_slave:
if (dns_message_gettsig(client->message, NULL) == NULL) {
dns_acl_t *forwardacl;
/*
* We only REFUSE if policy is explicitly set and
* we fail to match.
*/
forwardacl = dns_zone_getforwardacl(zone);
if (forwardacl == NULL) {
FAILS(DNS_R_NOTIMP,
"unsigned updates not forwarded (noacl)");
} else {
result = ns_client_checkacl(client,
"update-forward",
forwardacl,
ISC_FALSE,
ISC_LOG_INFO);
if (result != ISC_R_SUCCESS)
FAIL(DNS_R_REFUSED);
}
}
CHECK(send_forward_event(client, zone));
break; /* OK. */
default:
FAILC(DNS_R_NOTAUTH,
"not authoritative for update zone");
}
return;
failure:
/*
* We failed without having sent an update event to the zone.
* We are still in the client task context, so we can
* simply give an error response without switching tasks.
*/
respond(client, result);
if (zone != NULL)
dns_zone_detach(&zone);
}
static void
update_action(isc_task_t *task, isc_event_t *event) {
update_event_t *uev = (update_event_t *) event;
dns_zone_t *zone = uev->zone;
ns_client_t *client = (ns_client_t *)event->ev_arg;
isc_result_t result;
dns_db_t *db = NULL;
dns_dbversion_t *oldver = NULL;
dns_dbversion_t *ver = NULL;
dns_diff_t diff; /* Pending updates. */
dns_diff_t temp; /* Pending RR existence assertions. */
isc_boolean_t soa_serial_changed = ISC_FALSE;
isc_mem_t *mctx = client->mctx;
dns_rdatatype_t covers;
dns_message_t *request = client->message;
dns_rdataclass_t zoneclass;
dns_name_t *zonename;
dns_ssutable_t *ssutable = NULL;
INSIST(event->ev_type == DNS_EVENT_UPDATE);
dns_diff_init(mctx, &diff);
dns_diff_init(mctx, &temp);
CHECK(dns_zone_getdb(zone, &db));
zonename = dns_db_origin(db);
zoneclass = dns_db_class(db);
dns_zone_getssutable(zone, &ssutable);
dns_db_currentversion(db, &oldver);
CHECK(dns_db_newversion(db, &ver));
/*
* Check prerequisites.
*/
for (result = dns_message_firstname(request, DNS_SECTION_PREREQUISITE);
result == ISC_R_SUCCESS;
result = dns_message_nextname(request, DNS_SECTION_PREREQUISITE))
{
dns_name_t *name = NULL;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_ttl_t ttl;
dns_rdataclass_t update_class;
isc_boolean_t flag;
get_current_rr(request, DNS_SECTION_PREREQUISITE, zoneclass,
&name, &rdata, &covers, &ttl, &update_class);
if (ttl != 0)
FAILC(DNS_R_FORMERR, "prerequisite TTL is not zero");
if (! dns_name_issubdomain(name, zonename))
FAILC(DNS_R_NOTZONE,
"prerequisite name is out of zone");
if (update_class == dns_rdataclass_any) {
if (rdata.length != 0)
FAILC(DNS_R_FORMERR,
"class ANY prerequisite "
"RDATA is not empty");
if (rdata.type == dns_rdatatype_any) {
CHECK(name_exists(db, ver, name, &flag));
if (! flag) {
FAILC(DNS_R_NXDOMAIN,
"'name in use' prerequisite "
"not satisfied");
}
} else {
CHECK(rrset_exists(db, ver, name,
rdata.type, covers, &flag));
if (! flag) {
/* RRset does not exist. */
FAILC(DNS_R_NXRRSET,
"'rrset exists (value independent)' "
"prerequisite not satisfied");
}
}
} else if (update_class == dns_rdataclass_none) {
if (rdata.length != 0)
FAILC(DNS_R_FORMERR,
"class NONE prerequisite"
"RDATA is not empty");
if (rdata.type == dns_rdatatype_any) {
CHECK(name_exists(db, ver, name, &flag));
if (flag) {
FAILC(DNS_R_YXDOMAIN,
"'name not in use' prerequisite "
"not satisfied");
}
} else {
CHECK(rrset_exists(db, ver, name,
rdata.type, covers, &flag));
if (flag) {
/* RRset exists. */
FAILC(DNS_R_YXRRSET,
"'rrset does not exist' "
"prerequisite not satisfied");
}
}
} else if (update_class == zoneclass) {
/* "temp<rr.name, rr.type> += rr;" */
result = temp_append(&temp, name, &rdata);
if (result != ISC_R_SUCCESS) {
UNEXPECTED_ERROR(__FILE__, __LINE__,
"temp entry creation failed: %s",
dns_result_totext(result));
FAIL(ISC_R_UNEXPECTED);
}
} else {
FAILC(DNS_R_FORMERR, "malformed prerequisite");
}
}
if (result != ISC_R_NOMORE)
FAIL(result);
/*
* Perform the final check of the "rrset exists (value dependent)"
* prerequisites.
*/
result = temp_check(mctx, &temp, db, ver);
if (result != ISC_R_SUCCESS)
FAILC(result, "'RRset exists (value dependent)' "
"prerequisite not satisfied");
isc_log_write(UPDATE_DEBUG_LOGARGS, "prerequisites are OK");
/*
* Check Requestor's Permissions. It seems a bit silly to do this
* only after prerequisite testing, but that is what RFC2136 says.
*/
if (ssutable == NULL)
CHECK(ns_client_checkacl(client, "update",
dns_zone_getupdateacl(zone),
ISC_FALSE, ISC_LOG_ERROR));
else if (client->signer == NULL) {
/* This gets us a free log message. */
CHECK(ns_client_checkacl(client, "update", NULL, ISC_FALSE,
ISC_LOG_ERROR));
}
/*
* Perform the Update Section Prescan.
*/
for (result = dns_message_firstname(request, DNS_SECTION_UPDATE);
result == ISC_R_SUCCESS;
result = dns_message_nextname(request, DNS_SECTION_UPDATE))
{
dns_name_t *name = NULL;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_ttl_t ttl;
dns_rdataclass_t update_class;
get_current_rr(request, DNS_SECTION_UPDATE, zoneclass,
&name, &rdata, &covers, &ttl, &update_class);
if (! dns_name_issubdomain(name, zonename))
FAILC(DNS_R_NOTZONE,
"update RR is outside zone");
if (update_class == zoneclass) {
/*
* Check for meta-RRs. The RFC2136 pseudocode says
* check for ANY|AXFR|MAILA|MAILB, but the text adds
* "or any other QUERY metatype"
*/
if (dns_rdatatype_ismeta(rdata.type)) {
FAILC(DNS_R_FORMERR,
"meta-RR in update");
}
} else if (update_class == dns_rdataclass_any) {
if (ttl != 0 || rdata.length != 0 ||
(dns_rdatatype_ismeta(rdata.type) &&
rdata.type != dns_rdatatype_any))
FAILC(DNS_R_FORMERR,
"meta-RR in update");
} else if (update_class == dns_rdataclass_none) {
if (ttl != 0 ||
dns_rdatatype_ismeta(rdata.type))
FAILC(DNS_R_FORMERR,
"meta-RR in update");
} else {
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_UPDATE,
NS_LOGMODULE_UPDATE, ISC_LOG_WARNING,
"update RR has incorrect class %d",
update_class);
FAIL(DNS_R_FORMERR);
}
/*
* draft-ietf-dnsind-simple-secure-update-01 says
* "Unlike traditional dynamic update, the client
* is forbidden from updating NXT records."
*/
if (dns_db_issecure(db)) {
if (rdata.type == dns_rdatatype_nxt) {
FAILC(DNS_R_REFUSED,
"explicit NXT updates are not allowed "
"in secure zones");
}
else if (rdata.type == dns_rdatatype_sig) {
FAILC(DNS_R_REFUSED,
"explicit SIG updates are currently not "
"supported in secure zones");
}
}
if (ssutable != NULL && client->signer != NULL) {
if (rdata.type != dns_rdatatype_any) {
if (!dns_ssutable_checkrules(ssutable,
client->signer,
name, rdata.type))
FAILC(DNS_R_REFUSED,
"rejected by secure update");
}
else {
if (!ssu_checkall(db, ver, name, ssutable,
client->signer))
FAILC(DNS_R_REFUSED,
"rejected by secure update");
}
}
}
if (result != ISC_R_NOMORE)
FAIL(result);
isc_log_write(UPDATE_DEBUG_LOGARGS, "update section prescan OK");
/*
* Process the Update Section.
*/
for (result = dns_message_firstname(request, DNS_SECTION_UPDATE);
result == ISC_R_SUCCESS;
result = dns_message_nextname(request, DNS_SECTION_UPDATE))
{
dns_name_t *name = NULL;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_ttl_t ttl;
dns_rdataclass_t update_class;
isc_boolean_t flag;
get_current_rr(request, DNS_SECTION_UPDATE, zoneclass,
&name, &rdata, &covers, &ttl, &update_class);
if (update_class == zoneclass) {
if (rdata.type == dns_rdatatype_cname) {
CHECK(cname_incompatible_rrset_exists(db, ver,
name,
&flag));
if (flag) {
isc_log_write(UPDATE_PROTOCOL_LOGARGS,
"attempt to add CNAME "
"alongside non-CNAME "
"ignored");
continue;
}
} else {
CHECK(rrset_exists(db, ver, name,
dns_rdatatype_cname, 0,
&flag));
if (flag &&
! dns_rdatatype_isdnssec(rdata.type))
{
isc_log_write(UPDATE_PROTOCOL_LOGARGS,
"attempt to add non-CNAME "
"alongside CNAME ignored");
continue;
}
}
if (rdata.type == dns_rdatatype_soa) {
isc_boolean_t ok;
CHECK(rrset_exists(db, ver, name,
dns_rdatatype_soa, 0,
&flag));
if (! flag) {
isc_log_write(UPDATE_PROTOCOL_LOGARGS,
"attempt to create 2nd "
"SOA ignored");
continue;
}
CHECK(check_soa_increment(db, ver, &rdata,
&ok));
if (! ok) {
isc_log_write(UPDATE_PROTOCOL_LOGARGS,
"SOA update failed to "
"increment serial, "
"ignoring it");
continue;
}
soa_serial_changed = ISC_TRUE;
}
/*
* Add an RR. If an identical RR already exists,
* do nothing. If a similar but not identical
* CNAME, SOA, or WKS exists, remove it first.
*/
CHECK(matching_rr_exists(rr_equal_p, db, ver, name,
rdata.type, covers, &rdata,
&flag));
if (! flag) {
isc_log_write(UPDATE_PROTOCOL_LOGARGS,
"adding an RR");
CHECK(delete_if(replaces_p, db, ver, name,
rdata.type, covers, &rdata,
&diff));
result = update_one_rr(db, ver, &diff,
DNS_DIFFOP_ADD,
name, ttl, &rdata);
if (result != ISC_R_SUCCESS)
FAIL(result);
} else {
isc_log_write(UPDATE_PROTOCOL_LOGARGS,
"attempt to add existing RR "
"ignored");
}
} else if (update_class == dns_rdataclass_any) {
if (rdata.type == dns_rdatatype_any) {
isc_log_write(UPDATE_PROTOCOL_LOGARGS,
"delete all rrsets from a name");
if (dns_name_equal(name, zonename)) {
CHECK(delete_if(type_not_soa_nor_ns_p,
db, ver, name,
dns_rdatatype_any, 0,
&rdata, &diff));
} else {
CHECK(delete_if(true_p, db, ver, name,
dns_rdatatype_any, 0,
&rdata, &diff));
}
} else if (dns_name_equal(name, zonename) &&
(rdata.type == dns_rdatatype_soa ||
rdata.type == dns_rdatatype_ns)) {
isc_log_write(UPDATE_PROTOCOL_LOGARGS,
"attempt to delete all SOA "
"or NS records ignored");
continue;
} else {
isc_log_write(UPDATE_PROTOCOL_LOGARGS,
"deleting an rrset");
CHECK(delete_if(true_p, db, ver, name,
rdata.type, covers, &rdata,
&diff));
}
} else if (update_class == dns_rdataclass_none) {
/*
* The (name == zonename) condition appears in
* RFC2136 3.4.2.4 but is missing from the pseudocode.
*/
if (dns_name_equal(name, zonename)) {
if (rdata.type == dns_rdatatype_soa) {
isc_log_write(UPDATE_PROTOCOL_LOGARGS,
"attempt to delete SOA "
"ignored");
continue;
}
if (rdata.type == dns_rdatatype_ns) {
int count;
CHECK(rr_count(db, ver, name,
dns_rdatatype_ns,
0, &count));
if (count == 1) {
isc_log_write(
UPDATE_PROTOCOL_LOGARGS,
"attempt to delete last "
"NS ignored");
continue;
}
}
}
isc_log_write(UPDATE_PROTOCOL_LOGARGS,
"deleting an RR");
CHECK(delete_if(rr_equal_p, db, ver, name,
rdata.type, covers, &rdata, &diff));
}
}
if (result != ISC_R_NOMORE)
FAIL(result);
/*
* If any changes were made, increment the SOA serial number,
* update SIGs and NXTs (if zone is secure), and write the update
* to the journal.
*/
if (! ISC_LIST_EMPTY(diff.tuples)) {
dns_journal_t *journal;
/*
* Increment the SOA serial, but only if it was not
* changed as a result of an update operation.
*/
if (! soa_serial_changed) {
CHECK(increment_soa_serial(db, ver, &diff, mctx));
}
if (dns_db_issecure(db)) {
result = update_signatures(mctx, db, oldver, ver,
&diff, dns_zone_getsigvalidityinterval(zone));
if (result != ISC_R_SUCCESS) {
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_UPDATE,
NS_LOGMODULE_UPDATE,
ISC_LOG_ERROR,
"SIG/NXT update failed: %s",
isc_result_totext(result));
goto failure;
}
}
isc_log_write(UPDATE_DEBUG_LOGARGS, "writing journal %s",
dns_zone_getjournal(zone));
journal = NULL;
result = dns_journal_open(mctx, dns_zone_getjournal(zone),
ISC_TRUE, &journal);
if (result != ISC_R_SUCCESS)
FAILS(result, "journal open failed");
result = dns_journal_write_transaction(journal, &diff);
if (result != ISC_R_SUCCESS) {
dns_journal_destroy(&journal);
FAILS(result, "journal write failed");
}
dns_journal_destroy(&journal);
}
/*
* XXXRTH Just a note that this committing code will have to change
* to handle databases that need two-phase commit, but this
* isn't a priority.
*/
isc_log_write(UPDATE_DEBUG_LOGARGS, "committing update transaction");
dns_db_closeversion(db, &ver, ISC_TRUE);
/*
* Mark the zone as dirty so that it will be written to disk.
*/
dns_zone_markdirty(zone);
/*
* Notify slaves of the change we just made.
*/
dns_zone_notify(zone);
result = ISC_R_SUCCESS;
goto common;
failure:
/*
* The reason for failure should have been logged at this point.
*/
if (ver != NULL) {
isc_log_write(UPDATE_DEBUG_LOGARGS,
"rolling back");
dns_db_closeversion(db, &ver, ISC_FALSE);
}
common:
dns_diff_clear(&temp);
dns_diff_clear(&diff);
if (oldver != NULL)
dns_db_closeversion(db, &oldver, ISC_FALSE);
if (db != NULL)
dns_db_detach(&db);
if (ssutable != NULL)
dns_ssutable_detach(&ssutable);
if (zone != NULL)
dns_zone_detach(&zone);
isc_task_detach(&task);
uev->result = result;
uev->ev_type = DNS_EVENT_UPDATEDONE;
uev->ev_action = updatedone_action;
isc_task_send(client->task, &event);
INSIST(event == NULL);
}
static void
updatedone_action(isc_task_t *task, isc_event_t *event) {
update_event_t *uev = (update_event_t *) event;
ns_client_t *client = (ns_client_t *) event->ev_arg;
UNUSED(task);
INSIST(event->ev_type == DNS_EVENT_UPDATEDONE);
INSIST(task == client->task);
respond(client, uev->result);
ns_client_detach(&client);
isc_event_free(&event);
}
/*
* Update forwarding support.
*/
static void
forward_fail(ns_client_t *client, isc_result_t result) {
UNUSED(result);
respond(client, DNS_R_SERVFAIL);
}
static void
forward_callback(void *arg, isc_result_t result, dns_message_t *answer) {
ns_client_t *client = arg;
if (result != ISC_R_SUCCESS)
forward_fail(client, result);
else
ns_client_sendraw(client, answer);
ns_client_detach(&client);
}
static void
forward_action(isc_task_t *task, isc_event_t *event) {
update_event_t *uev = (update_event_t *) event;
dns_zone_t *zone = uev->zone;
ns_client_t *client = (ns_client_t *)event->ev_arg;
isc_result_t result;
result = dns_zone_forwardupdate(zone, client->message,
forward_callback, client);
if (result != ISC_R_SUCCESS) {
forward_fail(client, result);
ns_client_detach(&client);
}
dns_zone_detach(&zone);
isc_event_free(&event);
isc_task_detach(&task);
}
static isc_result_t
send_forward_event(ns_client_t *client, dns_zone_t *zone) {
isc_result_t result = ISC_R_SUCCESS;
update_event_t *event = NULL;
isc_task_t *zonetask = NULL;
ns_client_t *evclient;
event = (update_event_t *)
isc_event_allocate(client->mctx, client, DNS_EVENT_UPDATE,
forward_action, NULL, sizeof(*event));
if (event == NULL)
FAIL(ISC_R_NOMEMORY);
event->zone = zone;
event->result = ISC_R_SUCCESS;
evclient = NULL;
ns_client_attach(client, &evclient);
event->ev_arg = evclient;
dns_zone_gettask(zone, &zonetask);
isc_task_send(zonetask, (isc_event_t **)&event);
failure:
if (event != NULL)
isc_event_free((isc_event_t **)&event);
return (result);
}
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