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Bitstring labels *still* suck. They didn't somehow magically get less

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sucky in the past couple of months.  The nerve.

Anyway, dns_name_split now correctly compacts the preceding bitstring label
(if any) when a maximal bitstring is split.

It also correctly creates the suffix when a maximal bitstring is split.
It was doing this incorrectly before, independent of the compaction issue.
This commit is contained in:
David Lawrence 2000-11-14 23:48:02 +00:00
parent 7ff4d6ebca
commit e28b5084ec
1 changed files with 27 additions and 11 deletions
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38
lib/dns/name.c
View file

@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: name.c,v 1.106 2000/10/14 04:38:22 tale Exp $ */
/* $Id: name.c,v 1.107 2000/11/14 23:48:02 tale Exp $ */
#include <config.h>
@ -2629,11 +2629,12 @@ dns_name_split(dns_name_t *name,
dns_name_t *prefix, dns_name_t *suffix)
{
dns_offsets_t name_odata, split_odata;
unsigned char *offsets, *splitoffsets;
dns_offsets_t name_odata, prefix_odata, suffix_odata;
unsigned char *offsets, *prefix_offsets = NULL, *suffix_offsets;
isc_result_t result = ISC_R_SUCCESS;
unsigned int splitlabel, bitbytes, mod, len;
unsigned char *p, *src, *dst;
isc_boolean_t maybe_compact_prefix = ISC_FALSE;
REQUIRE(VALID_NAME(name));
REQUIRE(suffixlabels > 0);
@ -2701,11 +2702,14 @@ dns_name_split(dns_name_t *name,
}
/*
* Set the new bit count.
* Set the new bit count. Also, when a bitstring
* label being split is maximal length, compaction
* might be necessary on the prefix.
*/
if (*p == 0)
if (*p == 0) {
maybe_compact_prefix = ISC_TRUE;
*p = 256 - nbits;
else
} else
*p = *p - nbits;
/*
@ -2780,8 +2784,8 @@ dns_name_split(dns_name_t *name,
*/
INSIST(len = prefix->length);
INIT_OFFSETS(prefix, splitoffsets, split_odata);
set_offsets(prefix, splitoffsets, prefix);
INIT_OFFSETS(prefix, prefix_offsets, prefix_odata);
set_offsets(prefix, prefix_offsets, prefix);
INSIST(prefix->labels == splitlabel + 1 &&
prefix->length == len);
@ -2805,7 +2809,9 @@ dns_name_split(dns_name_t *name,
* the new name.
*/
src = &name->ndata[offsets[splitlabel] + 1];
len = (*src++ - 1) / 8 - (bitbytes - 1);
len = ((*src == 0 ? 256 : *src) - 1) / 8;
len -= (bitbytes - 1);
src++;
suffix->length = name->length -
offsets[splitlabel] - len;
@ -2881,8 +2887,8 @@ dns_name_split(dns_name_t *name,
*/
INSIST(len = suffix->length);
INIT_OFFSETS(suffix, splitoffsets, split_odata);
set_offsets(suffix, splitoffsets, suffix);
INIT_OFFSETS(suffix, suffix_offsets, suffix_odata);
set_offsets(suffix, suffix_offsets, suffix);
INSIST(suffix->labels == suffixlabels &&
suffix->length == len);
@ -2893,6 +2899,16 @@ dns_name_split(dns_name_t *name,
}
/*
* Compacting the prefix can't be done until after the suffix is
* set, because it would screw up the offsets table of 'name'
* when 'name' == 'prefix'.
*/
if (maybe_compact_prefix && splitlabel > 0 &&
prefix->ndata[prefix_offsets[splitlabel - 1]] ==
DNS_LABELTYPE_BITSTRING)
compact(prefix, prefix_offsets);
return (result);
}