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856. [func] Allow partial rdatasets to be returned in answer and

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authority sections to help non-TCP capable clients
                        recover from truncation.  [RT #1301]
This commit is contained in:
Mark Andrews
2001-06-05 09:02:16 +00:00
parent 7e93abafe6
commit 03f91269f5
6 changed files with 108 additions and 19 deletions
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24
lib/dns/message.c
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@@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: message.c,v 1.190 2001/04/19 18:28:35 bwelling Exp $ */
/* $Id: message.c,v 1.191 2001/06/05 09:02:11 marka Exp $ */
/***
*** Imports
@@ -1723,6 +1723,7 @@ dns_message_rendersection(dns_message_t *msg, dns_section_t sectionid,
isc_result_t result;
isc_buffer_t st; /* for rollbacks */
int pass;
isc_boolean_t partial = ISC_FALSE;
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(msg->buffer != NULL);
@@ -1742,6 +1743,8 @@ dns_message_rendersection(dns_message_t *msg, dns_section_t sectionid,
msg->buffer->length -= msg->reserved;
total = 0;
if (msg->reserved == 0 && (options & DNS_MESSAGERENDER_PARTIAL) != 0)
partial = ISC_TRUE;
do {
name = ISC_LIST_HEAD(*section);
@@ -1771,7 +1774,19 @@ dns_message_rendersection(dns_message_t *msg, dns_section_t sectionid,
st = *(msg->buffer);
count = 0;
result = dns_rdataset_towiresorted(rdataset,
if (partial)
result = dns_rdataset_towirepartial(
rdataset,
name,
msg->cctx,
msg->buffer,
msg->order,
msg->order_arg,
&count,
NULL);
else
result = dns_rdataset_towiresorted(
rdataset,
name,
msg->cctx,
msg->buffer,
@@ -1794,6 +1809,11 @@ dns_message_rendersection(dns_message_t *msg, dns_section_t sectionid,
* somewhere (probably in the message struct)
* to indicate where to continue from.
*/
if (partial && result == ISC_R_NOSPACE) {
msg->buffer->length += msg->reserved;
msg->counts[sectionid] += total;
return (result);
}
if (result != ISC_R_SUCCESS) {
INSIST(st.used < 65536);
dns_compress_rollback(msg->cctx,