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If the first record in a header chain was marked IGNORE, add() would

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incorrectly treat it as if the IGNORE attribute were not set, and the add
would not work correctly.  Rdatasets marked IGNORE are now ignored.

subtractrdataset() also failed to ignore rdatasets, and didn't cover the
case where the rdataset was marked as nonexistent.
This commit is contained in:
Bob Halley
1999-06-23 19:18:51 +00:00
parent 138a6660fb
commit c95819d75d
1 changed files with 87 additions and 36 deletions
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121
lib/dns/rbtdb.c
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@@ -88,7 +88,12 @@ typedef struct rdatasetheader {
#define RDATASET_ATTR_STALE 0x02
#define RDATASET_ATTR_IGNORE 0x04
#define IGNORE(header) (((header)->attributes & RDATASET_ATTR_IGNORE) != 0)
#define EXISTS(header) \
(((header)->attributes & RDATASET_ATTR_NONEXISTENT) == 0)
#define NONEXISTENT(header) \
(((header)->attributes & RDATASET_ATTR_NONEXISTENT) != 0)
#define IGNORE(header) \
(((header)->attributes & RDATASET_ATTR_IGNORE) != 0)
#define DEFAULT_NODE_LOCK_COUNT 7 /* Should be prime. */
@@ -2275,7 +2280,7 @@ add(dns_rbtdb_t *rbtdb, dns_rbtnode_t *rbtnode, rbtdb_version_t *rbtversion,
dns_rdataset_t *addedrdataset, isc_stdtime_t now)
{
rbtdb_changed_t *changed = NULL;
rdatasetheader_t *header, *header_prev;
rdatasetheader_t *topheader, *topheader_prev, *header;
unsigned char *merged;
dns_result_t result;
isc_boolean_t force = ISC_FALSE;
@@ -2303,18 +2308,26 @@ add(dns_rbtdb_t *rbtdb, dns_rbtnode_t *rbtnode, rbtdb_version_t *rbtversion,
}
}
newheader_nx = ((newheader->attributes & RDATASET_ATTR_NONEXISTENT)
!= 0 ? ISC_TRUE : ISC_FALSE);
newheader_nx = NONEXISTENT(newheader) ? ISC_TRUE : ISC_FALSE;
header_prev = NULL;
for (header = rbtnode->data; header != NULL; header = header->next) {
if (header->type == newheader->type)
topheader_prev = NULL;
for (topheader = rbtnode->data;
topheader != NULL;
topheader = topheader->next) {
if (topheader->type == newheader->type)
break;
header_prev = header;
topheader_prev = topheader;
}
/*
* If header isn't NULL, we've found the right type. There may be
* IGNORE rdatasets between the top of the chain and the first real
* data. We skip over them.
*/
header = topheader;
while (header != NULL && IGNORE(header))
header = header->down;
if (header != NULL) {
header_nx = ((header->attributes & RDATASET_ATTR_NONEXISTENT)
!= 0 ? ISC_TRUE : ISC_FALSE);
header_nx = NONEXISTENT(header) ? ISC_TRUE : ISC_FALSE;
/*
* Deleting an already non-existent rdataset has no effect.
@@ -2340,7 +2353,7 @@ add(dns_rbtdb_t *rbtdb, dns_rbtnode_t *rbtnode, rbtdb_version_t *rbtversion,
merge = ISC_FALSE;
/*
* XXXRTH We should turn off merging for rdata types that
* XXXRTH We need to turn off merging for rdata types that
* cannot be merged, e.g. SOA, CNAME, WKS.
*/
@@ -2383,12 +2396,12 @@ add(dns_rbtdb_t *rbtdb, dns_rbtnode_t *rbtnode, rbtdb_version_t *rbtversion,
}
}
INSIST(rbtversion == NULL ||
rbtversion->serial >= header->serial);
if (header_prev != NULL)
header_prev->next = newheader;
rbtversion->serial >= topheader->serial);
if (topheader_prev != NULL)
topheader_prev->next = newheader;
else
rbtnode->data = newheader;
newheader->next = header->next;
newheader->next = topheader->next;
if (loading) {
/*
* There are no other references to 'header' when
@@ -2399,28 +2412,56 @@ add(dns_rbtdb_t *rbtdb, dns_rbtnode_t *rbtnode, rbtdb_version_t *rbtversion,
newheader->down = NULL;
free_rdataset(rbtdb->common.mctx, header);
} else {
newheader->down = header;
header->next = newheader;
newheader->down = topheader;
topheader->next = newheader;
rbtnode->dirty = 1;
if (changed != NULL)
changed->dirty = ISC_TRUE;
}
} else {
/*
* The rdataset type doesn't exist at this node.
* No non-IGNORED rdatasets of the given type exist at
* this node.
*/
/*
* If we're trying to delete it, don't bother.
* If we're trying to delete the type, don't bother.
*/
if (newheader_nx) {
free_rdataset(rbtdb->common.mctx, newheader);
return (DNS_R_UNCHANGED);
}
newheader->next = rbtnode->data;
newheader->down = NULL;
rbtnode->data = newheader;
if (topheader != NULL) {
/*
* We have an list of rdatasets of the given type,
* but they're all marked IGNORE. We simply insert
* the new rdataset at the head of the list.
*
* Ignored rdatasets cannot occur during loading, so
* we INSIST on it.
*/
INSIST(!loading);
INSIST(rbtversion == NULL ||
rbtversion->serial >= topheader->serial);
if (topheader_prev != NULL)
topheader_prev->next = newheader;
else
rbtnode->data = newheader;
newheader->next = topheader->next;
newheader->down = topheader;
topheader->next = newheader;
rbtnode->dirty = 1;
if (changed != NULL)
changed->dirty = ISC_TRUE;
} else {
/*
* No rdatasets of the given type exist at the node.
*/
newheader->next = rbtnode->data;
newheader->down = NULL;
rbtnode->data = newheader;
}
}
if (addedrdataset != NULL)
@@ -2518,7 +2559,7 @@ subtractrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
dns_rbtnode_t *rbtnode = (dns_rbtnode_t *)node;
rbtdb_version_t *rbtversion = version;
rdatasetheader_t *header, *header_prev, *newheader;
rdatasetheader_t *topheader, *topheader_prev, *header, *newheader;
unsigned char *subresult;
isc_region_t region;
dns_result_t result;
@@ -2546,13 +2587,23 @@ subtractrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
return (DNS_R_NOMEMORY);
}
header_prev = NULL;
for (header = rbtnode->data; header != NULL; header = header->next) {
if (header->type == newheader->type)
topheader_prev = NULL;
for (topheader = rbtnode->data;
topheader != NULL;
topheader = topheader->next) {
if (topheader->type == newheader->type)
break;
header_prev = header;
topheader_prev = topheader;
}
if (header != NULL) {
/*
* If header isn't NULL, we've found the right type. There may be
* IGNORE rdatasets between the top of the chain and the first real
* data. We skip over them.
*/
header = topheader;
while (header != NULL && IGNORE(header))
header = header->down;
if (header != NULL && EXISTS(header)) {
result = dns_rdataslab_subtract(
(unsigned char *)header,
(unsigned char *)newheader,
@@ -2594,16 +2645,16 @@ subtractrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
/*
* If we're here, we want to link newheader in front of
* header.
* topheader.
*/
INSIST(rbtversion->serial >= header->serial);
if (header_prev != NULL)
header_prev->next = newheader;
INSIST(rbtversion->serial >= topheader->serial);
if (topheader_prev != NULL)
topheader_prev->next = newheader;
else
rbtnode->data = newheader;
newheader->next = header->next;
newheader->down = header;
header->next = newheader;
newheader->next = topheader->next;
newheader->down = topheader;
topheader->next = newheader;
rbtnode->dirty = 1;
changed->dirty = ISC_TRUE;
} else {