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Implement compression pointer rollback.

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dns_compress_backout() -> dns_compress_rollback()
This commit is contained in:
Mark Andrews
1999-05-03 03:07:16 +00:00
parent 1b9d5f3925
commit c1e7aff941
5 changed files with 72 additions and 13 deletions
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63
lib/dns/compress.c
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@@ -15,7 +15,7 @@
* SOFTWARE.
*/
/* $Id: compress.c,v 1.14 1999/04/28 03:16:50 marka Exp $ */
/* $Id: compress.c,v 1.15 1999/05/03 03:07:16 marka Exp $ */
#include <config.h>
#include <string.h>
@@ -340,12 +340,65 @@ dns_compress_add(dns_compress_t *cctx, dns_name_t *prefix,
}
void
dns_compress_backout(dns_compress_t *cctx, isc_uint16_t offset) {
dns_compress_rollback(dns_compress_t *cctx, isc_uint16_t offset) {
dns_rbtnode_t *node;
dns_fixedname_t foundfixed;
dns_fixedname_t fullfixed;
dns_fixedname_t originfixed;
dns_name_t *foundname;
dns_name_t *fullname;
dns_name_t *origin;
dns_rbtnodechain_t chain;
dns_result_t result;
REQUIRE(VALID_CCTX(cctx));
/* XXX MPA need tree walking code */
/* Remove all nodes in cctx->global that have *data >= offset. */
/*
* Initalise things.
*/
dns_fixedname_init(&foundfixed);
foundname = dns_fixedname_name(&foundfixed);
dns_fixedname_init(&fullfixed);
fullname = dns_fixedname_name(&fullfixed);
dns_fixedname_init(&originfixed);
origin = dns_fixedname_name(&originfixed);
dns_rbtnodechain_init(&chain, cctx->mctx);
again:
result = dns_rbtnodechain_first(&chain, cctx->global, foundname,
origin);
while (result == DNS_R_NEWORIGIN || result == DNS_R_SUCCESS) {
result = dns_rbtnodechain_current(&chain, foundname,
origin, &node);
if (result != DNS_R_SUCCESS)
break;
if (node->data != NULL &&
(*(isc_uint16_t*)node->data >= offset)) {
result = dns_name_concatenate(foundname,
dns_name_isabsolute(foundname) ?
NULL : origin,
fullname, NULL);
if (result != DNS_R_SUCCESS)
break;
result = dns_rbt_deletename(cctx->global, fullname,
ISC_FALSE);
if (result != DNS_R_SUCCESS)
break;
/*
* If the delete is successful the chain is broken.
*/
dns_rbtnodechain_reset(&chain);
goto again;
}
result = dns_rbtnodechain_next(&chain, foundname, origin);
}
dns_rbtnodechain_invalidate(&chain);
}
/***
@@ -375,7 +428,7 @@ dns_decompress_localinit(dns_decompress_t *dctx, dns_name_t *name,
REQUIRE(dns_name_isabsolute(name) == ISC_TRUE);
REQUIRE(isc_buffer_type(source) == ISC_BUFFERTYPE_BINARY);
dctx->rdata = source->current;
dctx->rdata = source->current; /* XXX layer violation */
dctx->owner_name = *name;
}