#include <config.h>
#include <isc/print.h>
#include <isc/string.h>
#include <isc/taskpool.h>
#include <isc/util.h>
#include <dns/db.h>
#include <dns/dbiterator.h>
#include <dns/diff.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/rdataclass.h>
#include <dns/rdataset.h>
#include <dns/rdatasetiter.h>
#include <dns/soa.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>
#define LOGLEVEL_PROTOCOL ISC_LOG_INFO
#define LOGLEVEL_DEBUG ISC_LOG_DEBUG(8)
#define CHECK(op) \
do { result = (op); \
if (result != ISC_R_SUCCESS) goto failure; \
} while (0)
#define FAIL(code) \
do { \
result = (code); \
if (result != ISC_R_SUCCESS) goto failure; \
} while (0)
#define FAILC(code, msg) \
do { \
result = (code); \
update_log(client, zone, LOGLEVEL_PROTOCOL, \
"update failed: %s (%s)", \
msg, isc_result_totext(result)); \
if (result != ISC_R_SUCCESS) goto failure; \
} while (0)
#define FAILS(code, msg) \
do { \
result = (code); \
update_log(client, zone, LOGLEVEL_PROTOCOL, \
"error: %s: %s", \
msg, isc_result_totext(result)); \
if (result != ISC_R_SUCCESS) goto failure; \
} while (0)
typedef struct rr rr_t;
struct rr {
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;
dns_message_t *answer;
};
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);
static void forward_done(isc_task_t *task, isc_event_t *event);
static void
update_log(ns_client_t *client, dns_zone_t *zone,
int level, const char *fmt, ...) ISC_FORMAT_PRINTF(4, 5);
static void
update_log(ns_client_t *client, dns_zone_t *zone,
int level, const char *fmt, ...)
{
va_list ap;
char message[4096];
char namebuf[DNS_NAME_FORMATSIZE];
char classbuf[DNS_RDATACLASS_FORMATSIZE];
if (client == NULL || zone == NULL)
return;
if (isc_log_wouldlog(ns_g_lctx, level) == ISC_FALSE)
return;
dns_name_format(dns_zone_getorigin(zone), namebuf,
sizeof(namebuf));
dns_rdataclass_format(dns_zone_getclass(zone), classbuf,
sizeof(classbuf));
va_start(ap, fmt);
vsnprintf(message, sizeof message, fmt, ap);
va_end(ap);
ns_client_log(client, NS_LOGCATEGORY_UPDATE, NS_LOGMODULE_UPDATE,
level, "updating zone '%s/%s': %s",
namebuf, classbuf, message);
}
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;
dns_diff_init(diff->mctx, &temp_diff);
ISC_LIST_APPEND(temp_diff.tuples, *tuple, link);
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);
}
dns_diff_appendminimal(diff, tuple);
return (ISC_R_SUCCESS);
}
static isc_result_t
do_diff(dns_diff_t *updates, dns_db_t *db, dns_dbversion_t *ver,
dns_diff_t *diff)
{
isc_result_t result;
while (! ISC_LIST_EMPTY(updates->tuples)) {
dns_difftuple_t *t = ISC_LIST_HEAD(updates->tuples);
ISC_LIST_UNLINK(updates->tuples, t, link);
CHECK(do_one_tuple(&t, db, ver, diff));
}
return (ISC_R_SUCCESS);
failure:
dns_diff_clear(diff);
return (result);
}
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));
}
typedef isc_result_t rrset_func(void *data, dns_rdataset_t *rrset);
typedef isc_result_t rr_func(void *data, rr_t *rr);
typedef struct {
rr_func * rr_action;
void * rr_action_data;
} foreach_node_rr_ctx_t;
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);
}
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);
}
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));
}
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);
}
typedef isc_boolean_t rr_predicate(dns_rdata_t *update_rr, dns_rdata_t *db_rr);
static isc_result_t
rrset_exists_action(void *data, rr_t *rr) {
UNUSED(data);
UNUSED(rr);
return (ISC_R_EXISTS);
}
#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))
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;
}
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);
}
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;
}
static isc_result_t
count_rr_action(void *data, rr_t *rr) {
int *countp = data;
UNUSED(rr);
(*countp)++;
return (ISC_R_SUCCESS);
}
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));
}
static isc_result_t
name_exists_action(void *data, dns_rdataset_t *rrset) {
UNUSED(data);
UNUSED(rrset);
return (ISC_R_EXISTS);
}
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 (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));
}
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);
}
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);
}
static int
temp_order(const void *av, const void *bv) {
dns_difftuple_t const * const *ap = av;
dns_difftuple_t const * const *bp = bv;
dns_difftuple_t const *a = *ap;
dns_difftuple_t const *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);
}
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;
if (ISC_LIST_HEAD(temp->tuples) == NULL)
return (ISC_R_SUCCESS);
result = dns_diff_sort(temp, temp_order);
if (result != ISC_R_SUCCESS)
return (result);
dns_diff_init(mctx, &trash);
t = ISC_LIST_HEAD(temp->tuples);
while (t != NULL) {
name = &t->name;
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);
while (t != NULL && dns_name_equal(&t->name, name)) {
dns_rdatatype_t type, covers;
dns_rdataset_t rdataset;
dns_diff_t d_rrs;
dns_diff_t u_rrs;
type = t->rdata.type;
if (type == dns_rdatatype_sig)
covers = dns_rdata_covers(&t->rdata);
else
covers = 0;
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;
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;
}
result = temp_check_rrset(ISC_LIST_HEAD(u_rrs.tuples),
ISC_LIST_HEAD(d_rrs.tuples));
if (result != ISC_R_SUCCESS)
goto failure;
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);
}
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;
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);
}
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);
}
static isc_boolean_t
rr_equal_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) {
return (dns_rdata_compare(update_rr, db_rr) == 0 ?
ISC_TRUE : ISC_FALSE);
}
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) {
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);
}
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);
}
}
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));
}
typedef struct {
dns_db_t *db;
dns_dbversion_t *ver;
dns_diff_t *diff;
dns_name_t *name;
dns_rdata_t *update_rr;
dns_ttl_t update_rr_ttl;
isc_boolean_t ignore_add;
dns_diff_t del_diff;
dns_diff_t add_diff;
} add_rr_prepare_ctx_t;
static isc_result_t
add_rr_prepare_action(void *data, rr_t *rr) {
isc_result_t result = ISC_R_SUCCESS;
add_rr_prepare_ctx_t *ctx = data;
dns_difftuple_t *tuple = NULL;
if (dns_rdata_compare(&rr->rdata, ctx->update_rr) == 0 &&
rr->ttl == ctx->update_rr_ttl) {
ctx->ignore_add = ISC_TRUE;
}
if (replaces_p(ctx->update_rr, &rr->rdata)) {
CHECK(dns_difftuple_create(ctx->del_diff.mctx,
DNS_DIFFOP_DEL, ctx->name,
rr->ttl,
&rr->rdata,
&tuple));
dns_diff_append(&ctx->del_diff, &tuple);
return (ISC_R_SUCCESS);
}
if (rr->ttl != ctx->update_rr_ttl) {
CHECK(dns_difftuple_create(ctx->del_diff.mctx,
DNS_DIFFOP_DEL, ctx->name,
rr->ttl,
&rr->rdata,
&tuple));
dns_diff_append(&ctx->del_diff, &tuple);
CHECK(dns_difftuple_create(ctx->add_diff.mctx,
DNS_DIFFOP_ADD, ctx->name,
ctx->update_rr_ttl,
&rr->rdata,
&tuple));
dns_diff_append(&ctx->add_diff, &tuple);
}
failure:
return (result);
}
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;
}
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);
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);
}
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);
}
#define MAXZONEKEYS 32
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);
}
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);
}
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;
}
static int
name_order(const void *av, const void *bv) {
dns_difftuple_t const * const *ap = av;
dns_difftuple_t const * const *bp = bv;
dns_difftuple_t const *a = *ap;
dns_difftuple_t const *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) {
*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);
}
}
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;
unsigned int wraps = 0;
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) {
if (forward)
CHECK(dns_dbiterator_first(dbit));
else
CHECK(dns_dbiterator_last(dbit));
wraps++;
if (wraps == 2) {
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_UPDATE,
NS_LOGMODULE_UPDATE,
ISC_LOG_ERROR,
"secure zone with no NXTs");
result = DNS_R_BADZONE;
goto failure;
}
}
dns_dbiterator_current(dbit, &node, newname);
dns_db_detachnode(db, &node);
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);
}
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);
CHECK(next_active(db, ver, name, target, ISC_TRUE));
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);
CHECK(delete_if(true_p, db, ver, name, dns_rdatatype_nxt, 0,
NULL, diff));
CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, name,
3600,
&rdata, &tuple));
CHECK(do_one_tuple(&tuple, db, ver, diff));
INSIST(tuple == NULL);
failure:
if (node != NULL)
dns_db_detachnode(db, &node);
return (result);
}
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 };
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);
}
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];
unsigned int i;
dns_rdataset_init(&rdataset);
isc_buffer_init(&buffer, data, sizeof(data));
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++) {
CHECK(dns_dnssec_sign(name, &rdataset, keys[i],
&inception, &expire,
mctx, &buffer, &sig_rdata));
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);
}
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;
expire = now + sigvalidityinterval;
CHECK(dns_diff_sort(diff, temp_order));
t = ISC_LIST_HEAD(diff->tuples);
while (t != NULL) {
dns_name_t *name = &t->name;
CHECK(namelist_append_name(&diffnames, name));
while (t != NULL && dns_name_equal(&t->name, name)) {
dns_rdatatype_t type;
type = t->rdata.type;
if (type == dns_rdatatype_sig)
goto skip;
CHECK(delete_if(true_p, db, newver, name,
dns_rdatatype_sig, type,
NULL, &sig_diff));
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:
while (t != NULL &&
dns_name_equal(&t->name, name) &&
t->rdata.type == type)
{
t = ISC_LIST_NEXT(t, link);
}
}
}
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));
}
}
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;
CHECK(next_active(db, newver, &t->name, prevname, ISC_FALSE));
CHECK(namelist_append_name(&affected, prevname));
}
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;
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));
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) {
CHECK(delete_if(true_p, db, newver, &t->name,
dns_rdatatype_nxt, 0,
NULL, &nxt_diff));
} else {
CHECK(rrset_exists(db, newver, &t->name,
dns_rdatatype_nxt, 0, &flag));
if (! flag) {
add_placeholder_nxt(db, newver, &t->name,
diff);
}
}
}
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) {
CHECK(add_nxt(db, newver, &t->name, &nxt_diff));
}
}
while ((t = ISC_LIST_HEAD(nxt_diff.tuples)) != NULL) {
ISC_LIST_UNLINK(nxt_diff.tuples, t, link);
dns_diff_appendminimal(&nxt_mindiff, &t);
}
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);
}
}
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);
}
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;
result = dns_message_firstname(request, DNS_SECTION_ZONE);
if (result != ISC_R_SUCCESS)
FAILC(DNS_R_FORMERR,
"update zone section empty");
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");
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:
if (sigresult != ISC_R_SUCCESS)
FAIL(sigresult);
CHECK(send_update_event(client, zone));
break;
case dns_zone_slave:
CHECK(ns_client_checkacl(client, "update forwarding",
dns_zone_getforwardacl(zone),
ISC_FALSE, ISC_LOG_ERROR));
CHECK(send_forward_event(client, zone));
break;
default:
FAILC(DNS_R_NOTAUTH,
"not authoritative for update zone");
}
return;
failure:
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;
dns_diff_t temp;
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));
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) {
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) {
FAILC(DNS_R_YXRRSET,
"'rrset does not exist' "
"prerequisite not satisfied");
}
}
} else if (update_class == zoneclass) {
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);
result = temp_check(mctx, &temp, db, ver);
if (result != ISC_R_SUCCESS)
FAILC(result, "'RRset exists (value dependent)' "
"prerequisite not satisfied");
update_log(client, zone, LOGLEVEL_DEBUG,
"prerequisites are OK");
if (ssutable == NULL) {
char msg[DNS_RDATACLASS_FORMATSIZE + DNS_NAME_FORMATSIZE
+ sizeof("update '/'")];
ns_client_aclmsg("update", zonename, client->view->rdclass,
msg, sizeof(msg));
CHECK(ns_client_checkacl(client, msg,
dns_zone_getupdateacl(zone),
ISC_FALSE, ISC_LOG_ERROR));
} else if (client->signer == NULL) {
char msg[DNS_RDATACLASS_FORMATSIZE + DNS_NAME_FORMATSIZE
+ sizeof("update '/'")];
ns_client_aclmsg("update", zonename, client->view->rdclass,
msg, sizeof(msg));
CHECK(ns_client_checkacl(client, msg, NULL, ISC_FALSE,
ISC_LOG_ERROR));
}
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) {
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 {
update_log(client, zone, ISC_LOG_WARNING,
"update RR has incorrect class %d",
update_class);
FAIL(DNS_R_FORMERR);
}
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);
update_log(client, zone, LOGLEVEL_DEBUG,
"update section prescan OK");
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) {
update_log(client, zone,
LOGLEVEL_PROTOCOL,
"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))
{
update_log(client, zone,
LOGLEVEL_PROTOCOL,
"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) {
update_log(client, zone,
LOGLEVEL_PROTOCOL,
"attempt to create 2nd "
"SOA ignored");
continue;
}
CHECK(check_soa_increment(db, ver, &rdata,
&ok));
if (! ok) {
update_log(client, zone,
LOGLEVEL_PROTOCOL,
"SOA update failed to "
"increment serial, "
"ignoring it");
continue;
}
soa_serial_changed = ISC_TRUE;
}
update_log(client, zone,
LOGLEVEL_PROTOCOL, "adding an RR");
{
add_rr_prepare_ctx_t ctx;
ctx.db = db;
ctx.ver = ver;
ctx.diff = &diff;
ctx.name = name;
ctx.update_rr = &rdata;
ctx.update_rr_ttl = ttl;
ctx.ignore_add = ISC_FALSE;
dns_diff_init(mctx, &ctx.del_diff);
dns_diff_init(mctx, &ctx.add_diff);
CHECK(foreach_rr(db, ver, name, rdata.type, covers,
add_rr_prepare_action, &ctx));
if (ctx.ignore_add) {
dns_diff_clear(&ctx.del_diff);
dns_diff_clear(&ctx.add_diff);
} else {
CHECK(do_diff(&ctx.del_diff, db, ver, &diff));
CHECK(do_diff(&ctx.add_diff, db, ver, &diff));
CHECK(update_one_rr(db, ver, &diff,
DNS_DIFFOP_ADD,
name, ttl, &rdata));
}
}
} else if (update_class == dns_rdataclass_any) {
if (rdata.type == dns_rdatatype_any) {
update_log(client, zone,
LOGLEVEL_PROTOCOL,
"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)) {
update_log(client, zone,
LOGLEVEL_PROTOCOL,
"attempt to delete all SOA "
"or NS records ignored");
continue;
} else {
update_log(client, zone,
LOGLEVEL_PROTOCOL,
"deleting an rrset");
CHECK(delete_if(true_p, db, ver, name,
rdata.type, covers, &rdata,
&diff));
}
} else if (update_class == dns_rdataclass_none) {
if (dns_name_equal(name, zonename)) {
if (rdata.type == dns_rdatatype_soa) {
update_log(client, zone,
LOGLEVEL_PROTOCOL,
"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) {
update_log(client, zone,
LOGLEVEL_PROTOCOL,
"attempt to "
"delete last "
"NS ignored");
continue;
}
}
}
update_log(client, zone,
LOGLEVEL_PROTOCOL,
"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 (! ISC_LIST_EMPTY(diff.tuples)) {
char *journalfile;
dns_journal_t *journal;
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) {
update_log(client, zone,
ISC_LOG_ERROR,
"SIG/NXT update failed: %s",
isc_result_totext(result));
goto failure;
}
}
journalfile = dns_zone_getjournal(zone);
if (journalfile != NULL) {
update_log(client, zone, LOGLEVEL_DEBUG,
"writing journal %s", journalfile);
journal = NULL;
result = dns_journal_open(mctx, journalfile,
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);
}
}
update_log(client, zone, LOGLEVEL_DEBUG,
"committing update transaction");
dns_db_closeversion(db, &ver, ISC_TRUE);
dns_zone_markdirty(zone);
dns_zone_notify(zone);
result = ISC_R_SUCCESS;
goto common;
failure:
if (ver != NULL) {
update_log(client, zone, LOGLEVEL_DEBUG,
"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);
}
static void
forward_fail(isc_task_t *task, isc_event_t *event) {
ns_client_t *client = (ns_client_t *)event->ev_arg;
UNUSED(task);
respond(client, DNS_R_SERVFAIL);
ns_client_detach(&client);
isc_event_free((isc_event_t **)&event);
}
static void
forward_callback(void *arg, isc_result_t result, dns_message_t *answer) {
update_event_t *uev = arg;
ns_client_t *client = uev->ev_arg;
if (result != ISC_R_SUCCESS) {
INSIST(answer == NULL);
uev->ev_type = DNS_EVENT_UPDATEDONE;
uev->ev_action = forward_fail;
} else {
uev->ev_type = DNS_EVENT_UPDATEDONE;
uev->ev_action = forward_done;
uev->answer = answer;
}
isc_task_send(client->task, (isc_event_t**)&uev);
}
static void
forward_done(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);
ns_client_sendraw(client, uev->answer);
dns_message_destroy(&uev->answer);
isc_event_free((isc_event_t **)&event);
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, event);
if (result != ISC_R_SUCCESS) {
uev->ev_type = DNS_EVENT_UPDATEDONE;
uev->ev_action = forward_fail;
isc_task_send(client->task, &event);
}
dns_zone_detach(&zone);
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);
}