/*
* XXX uses qsort(); a merge sort would be more natural for lists,
* and perhaps safer wrt thread stack overflow.
*/
isc_result_t
dns_diff_sort(dns_diff_t *diff, dns_diff_compare_func *compare) {
unsigned int length = 0;
unsigned int i;
dns_difftuple_t **v;
dns_difftuple_t *p;
REQUIRE(DNS_DIFF_VALID(diff));
for (p = ISC_LIST_HEAD(diff->tuples);
p != NULL;
p = ISC_LIST_NEXT(p, link))
length++;
if (length == 0)
return (ISC_R_SUCCESS);
v = isc_mem_get(diff->mctx, length * sizeof(dns_difftuple_t *));
if (v == NULL)
return (ISC_R_NOMEMORY);
for (i = 0; i < length; i++) {
p = ISC_LIST_HEAD(diff->tuples);
v[i] = p;
ISC_LIST_UNLINK(diff->tuples, p, link);
}
INSIST(ISC_LIST_HEAD(diff->tuples) == NULL);
qsort(v, length, sizeof(v[0]), compare);
for (i = 0; i < length; i++) {
ISC_LIST_APPEND(diff->tuples, v[i], link);
}
isc_mem_put(diff->mctx, v, length * sizeof(dns_difftuple_t *));
return (ISC_R_SUCCESS);
}
void
dns_diff_clear(dns_diff_t *diff) {
dns_difftuple_t *t;
REQUIRE(DNS_DIFF_VALID(diff));
while ((t = ISC_LIST_HEAD(diff->tuples)) != NULL) {
ISC_LIST_UNLINK(diff->tuples, t, link);
dns_difftuple_free(&t);
}
ENSURE(ISC_LIST_EMPTY(diff->tuples));
}
void
dns_diff_appendminimal(dns_diff_t *diff, dns_difftuple_t **tuplep)
{
dns_difftuple_t *ot, *next_ot;
REQUIRE(DNS_DIFF_VALID(diff));
REQUIRE(DNS_DIFFTUPLE_VALID(*tuplep));
/*
* Look for an existing tuple with the same owner name,
* rdata, and TTL. If we are doing an addition and find a
* deletion or vice versa, remove both the old and the
* new tuple since they cancel each other out (assuming
* that we never delete nonexistent data or add existing
* data).
*
* If we find an old update of the same kind as
* the one we are doing, there must be a programming
* error. We report it but try to continue anyway.
*/
for (ot = ISC_LIST_HEAD(diff->tuples); ot != NULL;
ot = next_ot)
{
next_ot = ISC_LIST_NEXT(ot, link);
if (dns_name_equal(&ot->name, &(*tuplep)->name) &&
dns_rdata_compare(&ot->rdata, &(*tuplep)->rdata) == 0 &&
ot->ttl == (*tuplep)->ttl)
{
ISC_LIST_UNLINK(diff->tuples, ot, link);
if ((*tuplep)->op == ot->op) {
UNEXPECTED_ERROR(__FILE__, __LINE__,
"unexpected non-minimal diff");
} else {
dns_difftuple_free(tuplep);
}
dns_difftuple_free(&ot);
break;
}
}
if (*tuplep != NULL) {
ISC_LIST_APPEND(diff->tuples, *tuplep, link);
*tuplep = NULL;
}
ENSURE(*tuplep == NULL);
}
isc_result_t
dns_diff_print(dns_diff_t *diff, FILE *file) {
isc_result_t result;
dns_difftuple_t *t;
char *mem = NULL;
unsigned int size = 2048;
const char *op = NULL;
REQUIRE(DNS_DIFF_VALID(diff));
mem = isc_mem_get(diff->mctx, size);
if (mem == NULL)
return (ISC_R_NOMEMORY);
for (t = ISC_LIST_HEAD(diff->tuples); t != NULL;
t = ISC_LIST_NEXT(t, link))
{
isc_buffer_t buf;
isc_region_t r;
dns_rdatalist_t rdl;
dns_rdataset_t rds;
dns_rdata_t rd = DNS_RDATA_INIT;
result = diff_tuple_tordataset(t, &rd, &rdl, &rds);
if (result != ISC_R_SUCCESS) {
UNEXPECTED_ERROR(__FILE__, __LINE__,
"diff_tuple_tordataset failed: %s",
dns_result_totext(result));
result = ISC_R_UNEXPECTED;
goto cleanup;
}
again:
isc_buffer_init(&buf, mem, size);
result = dns_rdataset_totext(&rds, &t->name,
ISC_FALSE, ISC_FALSE, &buf);
if (result == ISC_R_NOSPACE) {
isc_mem_put(diff->mctx, mem, size);
size += 1024;
mem = isc_mem_get(diff->mctx, size);
if (mem == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
goto again;
}
if (result != ISC_R_SUCCESS)
goto cleanup;
/*
* Get rid of final newline.
*/
INSIST(buf.used >= 1 &&
((char *) buf.base)[buf.used-1] == '\n');
buf.used--;
isc_buffer_usedregion(&buf, &r);
switch (t->op) {
case DNS_DIFFOP_EXISTS: op = "exists"; break;
case DNS_DIFFOP_ADD: op = "add"; break;
case DNS_DIFFOP_DEL: op = "del"; break;
case DNS_DIFFOP_ADDRESIGN: op = "add re-sign"; break;
case DNS_DIFFOP_DELRESIGN: op = "del re-sign"; break;
}
if (file != NULL)
fprintf(file, "%s %.*s\n", op, (int) r.length,
(char *) r.base);
else
isc_log_write(DIFF_COMMON_LOGARGS, ISC_LOG_DEBUG(7),
"%s %.*s", op, (int) r.length,
(char *) r.base);
}
result = ISC_R_SUCCESS;
cleanup:
if (mem != NULL)
isc_mem_put(diff->mctx, mem, size);
return (result);
}
isc_result_t
dns_diff_load(dns_diff_t *diff, dns_addrdatasetfunc_t addfunc,
void *add_private)
{
dns_difftuple_t *t;
isc_result_t result;
REQUIRE(DNS_DIFF_VALID(diff));
t = ISC_LIST_HEAD(diff->tuples);
while (t != NULL) {
dns_name_t *name;
name = &t->name;
while (t != NULL && dns_name_equal(&t->name, name)) {
dns_rdatatype_t type, covers;
dns_diffop_t op;
dns_rdatalist_t rdl;
dns_rdataset_t rds;
op = t->op;
type = t->rdata.type;
covers = rdata_covers(&t->rdata);
dns_rdatalist_init(&rdl);
rdl.type = type;
rdl.covers = covers;
rdl.rdclass = t->rdata.rdclass;
rdl.ttl = t->ttl;
while (t != NULL && dns_name_equal(&t->name, name) &&
t->op == op && t->rdata.type == type &&
rdata_covers(&t->rdata) == covers)
{
ISC_LIST_APPEND(rdl.rdata, &t->rdata, link);
t = ISC_LIST_NEXT(t, link);
}
/*
* Convert the rdatalist into a rdataset.
*/
dns_rdataset_init(&rds);
CHECK(dns_rdatalist_tordataset(&rdl, &rds));
rds.trust = dns_trust_ultimate;
INSIST(op == DNS_DIFFOP_ADD);
result = (*addfunc)(add_private, name, &rds);
if (result == DNS_R_UNCHANGED) {
isc_log_write(DIFF_COMMON_LOGARGS,
ISC_LOG_WARNING,
"dns_diff_load: "
"update with no effect");
} else if (result == ISC_R_SUCCESS ||
result == DNS_R_NXRRSET) {
/*
* OK.
*/
} else {
CHECK(result);
}
}
}
result = ISC_R_SUCCESS;
failure:
return (result);
}
static isc_result_t
diff_apply(dns_diff_t *diff, dns_db_t *db, dns_dbversion_t *ver,
isc_boolean_t warn)
{
dns_difftuple_t *t;
dns_dbnode_t *node = NULL;
isc_result_t result;
char namebuf[DNS_NAME_FORMATSIZE];
char typebuf[DNS_RDATATYPE_FORMATSIZE];
char classbuf[DNS_RDATACLASS_FORMATSIZE];
REQUIRE(DNS_DIFF_VALID(diff));
REQUIRE(DNS_DB_VALID(db));
t = ISC_LIST_HEAD(diff->tuples);
while (t != NULL) {
dns_name_t *name;
INSIST(node == NULL);
name = &t->name;
/*
* Find the node.
* We create the node if it does not exist.
* This will cause an empty node to be created if the diff
* contains a deletion of an RR at a nonexistent name,
* but such diffs should never be created in the first
* place.
*/
while (t != NULL && dns_name_equal(&t->name, name)) {
dns_rdatatype_t type, covers;
dns_diffop_t op;
dns_rdatalist_t rdl;
dns_rdataset_t rds;
dns_rdataset_t ardataset;
dns_rdataset_t *modified = NULL;
op = t->op;
type = t->rdata.type;
covers = rdata_covers(&t->rdata);
/*
* Collect a contiguous set of updates with
* the same operation (add/delete) and RR type
* into a single rdatalist so that the
* database rrset merging/subtraction code
* can work more efficiently than if each
* RR were merged into / subtracted from
* the database separately.
*
* This is done by linking rdata structures from the
* diff into "rdatalist". This uses the rdata link
* field, not the diff link field, so the structure
* of the diff itself is not affected.
*/
dns_rdatalist_init(&rdl);
rdl.type = type;
rdl.covers = covers;
rdl.rdclass = t->rdata.rdclass;
rdl.ttl = t->ttl;
node = NULL;
if (type != dns_rdatatype_nsec3 &&
covers != dns_rdatatype_nsec3)
CHECK(dns_db_findnode(db, name, ISC_TRUE,
&node));
else
CHECK(dns_db_findnsec3node(db, name, ISC_TRUE,
&node));
while (t != NULL &&
dns_name_equal(&t->name, name) &&
t->op == op &&
t->rdata.type == type &&
rdata_covers(&t->rdata) == covers)
{
dns_name_format(name, namebuf, sizeof(namebuf));
dns_rdatatype_format(t->rdata.type, typebuf,
sizeof(typebuf));
dns_rdataclass_format(t->rdata.rdclass,
classbuf,
sizeof(classbuf));
if (t->ttl != rdl.ttl && warn)
isc_log_write(DIFF_COMMON_LOGARGS,
ISC_LOG_WARNING,
"'%s/%s/%s': TTL differs in "
"rdataset, adjusting "
"%lu -> %lu",
namebuf, typebuf, classbuf,
(unsigned long) t->ttl,
(unsigned long) rdl.ttl);
ISC_LIST_APPEND(rdl.rdata, &t->rdata, link);
t = ISC_LIST_NEXT(t, link);
}
/*
* Convert the rdatalist into a rdataset.
*/
dns_rdataset_init(&rds);
CHECK(dns_rdatalist_tordataset(&rdl, &rds));
if (rds.type == dns_rdatatype_rrsig)
switch (op) {
case DNS_DIFFOP_ADDRESIGN:
case DNS_DIFFOP_DELRESIGN:
modified = &ardataset;
dns_rdataset_init(modified);
break;
default:
break;
}
rds.trust = dns_trust_ultimate;
/*
* Merge the rdataset into the database.
*/
switch (op) {
case DNS_DIFFOP_ADD:
case DNS_DIFFOP_ADDRESIGN:
result = dns_db_addrdataset(db, node, ver,
0, &rds,
DNS_DBADD_MERGE|
DNS_DBADD_EXACT|
DNS_DBADD_EXACTTTL,
modified);
break;
case DNS_DIFFOP_DEL:
case DNS_DIFFOP_DELRESIGN:
result = dns_db_subtractrdataset(db, node, ver,
&rds,
DNS_DBSUB_EXACT,
modified);
break;
default:
INSIST(0);
}
if (result == ISC_R_SUCCESS) {
if (modified != NULL) {
isc_stdtime_t resign;
resign = setresign(modified);
dns_db_setsigningtime(db, modified,
resign);
}
} else if (result == DNS_R_UNCHANGED) {
/*
* This will not happen when executing a
* dynamic update, because that code will
* generate strictly minimal diffs.
* It may happen when receiving an IXFR
* from a server that is not as careful.
* Issue a warning and continue.
*/
if (warn) {
dns_name_format(dns_db_origin(db),
namebuf,
sizeof(namebuf));
dns_rdataclass_format(dns_db_class(db),
classbuf,
sizeof(classbuf));
isc_log_write(DIFF_COMMON_LOGARGS,
ISC_LOG_WARNING,
"%s/%s: dns_diff_apply: "
"update with no effect",
namebuf, classbuf);
}
} else if (result == DNS_R_NXRRSET) {
/*
* OK.
*/
} else {
if (modified != NULL &&
dns_rdataset_isassociated(modified))
dns_rdataset_disassociate(modified);
CHECK(result);
}
dns_db_detachnode(db, &node);
if (modified != NULL &&
dns_rdataset_isassociated(modified))
dns_rdataset_disassociate(modified);
}
}
return (ISC_R_SUCCESS);
failure:
if (node != NULL)
dns_db_detachnode(db, &node);
return (result);
}
static isc_result_t
diff_apply(dns_diff_t *diff, dns_db_t *db, dns_dbversion_t *ver,
isc_boolean_t warn)
{
dns_difftuple_t *t;
dns_dbnode_t *node = NULL;
isc_result_t result;
REQUIRE(DNS_DIFF_VALID(diff));
REQUIRE(DNS_DB_VALID(db));
t = ISC_LIST_HEAD(diff->tuples);
while (t != NULL) {
dns_name_t *name;
INSIST(node == NULL);
name = &t->name;
/*
* Find the node.
* We create the node if it does not exist.
* This will cause an empty node to be created if the diff
* contains a deletion of an RR at a nonexistent name,
* but such diffs should never be created in the first
* place.
*/
node = NULL;
CHECK(dns_db_findnode(db, name, ISC_TRUE, &node));
while (t != NULL && dns_name_equal(&t->name, name)) {
dns_rdatatype_t type, covers;
dns_diffop_t op;
dns_rdatalist_t rdl;
dns_rdataset_t rds;
op = t->op;
type = t->rdata.type;
covers = rdata_covers(&t->rdata);
/*
* Collect a contiguous set of updates with
* the same operation (add/delete) and RR type
* into a single rdatalist so that the
* database rrset merging/subtraction code
* can work more efficiently than if each
* RR were merged into / subtracted from
* the database separately.
*
* This is done by linking rdata structures from the
* diff into "rdatalist". This uses the rdata link
* field, not the diff link field, so the structure
* of the diff itself is not affected.
*/
rdl.type = type;
rdl.covers = covers;
rdl.rdclass = t->rdata.rdclass;
rdl.ttl = t->ttl;
ISC_LIST_INIT(rdl.rdata);
ISC_LINK_INIT(&rdl, link);
while (t != NULL &&
dns_name_equal(&t->name, name) &&
t->op == op &&
t->rdata.type == type &&
rdata_covers(&t->rdata) == covers)
{
if (t->ttl != rdl.ttl && warn)
isc_log_write(DIFF_COMMON_LOGARGS,
ISC_LOG_WARNING,
"TTL differs in rdataset, "
"adjusting %lu -> %lu",
(unsigned long) t->ttl,
(unsigned long) rdl.ttl);
ISC_LIST_APPEND(rdl.rdata, &t->rdata, link);
t = ISC_LIST_NEXT(t, link);
}
/*
* Convert the rdatalist into a rdataset.
*/
dns_rdataset_init(&rds);
CHECK(dns_rdatalist_tordataset(&rdl, &rds));
rds.trust = dns_trust_ultimate;
/*
* Merge the rdataset into the database.
*/
if (op == DNS_DIFFOP_ADD) {
result = dns_db_addrdataset(db, node, ver,
0, &rds,
DNS_DBADD_MERGE|
DNS_DBADD_EXACT|
DNS_DBADD_EXACTTTL,
NULL);
} else if (op == DNS_DIFFOP_DEL) {
result = dns_db_subtractrdataset(db, node, ver,
&rds,
DNS_DBSUB_EXACT,
NULL);
} else {
INSIST(0);
}
if (result == DNS_R_UNCHANGED) {
/*
* This will not happen when executing a
* dynamic update, because that code will
* generate strictly minimal diffs.
* It may happen when receiving an IXFR
* from a server that is not as careful.
* Issue a warning and continue.
*/
if (warn)
isc_log_write(DIFF_COMMON_LOGARGS,
ISC_LOG_WARNING,
"update with no effect");
} else if (result == ISC_R_SUCCESS ||
result == DNS_R_NXRRSET) {
/*
* OK.
*/
} else {
CHECK(result);
}
}
dns_db_detachnode(db, &node);
}
return (ISC_R_SUCCESS);
failure:
if (node != NULL)
dns_db_detachnode(db, &node);
return (result);
}
