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661.   [bug]           Certain UDP IXFR requests caused an assertion failure
                        (mpctx->allocated == 0). [RT #355, #394, #623]
This commit is contained in:
Andreas Gustafsson 2001-01-08 20:11:40 +00:00
parent 16c708dbbb
commit 5e9607e31b
2 changed files with 74 additions and 66 deletions
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3
CHANGES
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@ -1,4 +1,7 @@
661. [bug] Certain UDP IXFR requests caused an assertion failure
(mpctx->allocated == 0). [RT #355, #394, #623]
589. [bug] The server could deadlock if a zone was updated
while being transferred out.

137
bin/named/xfrout.c
View file

@ -15,7 +15,7 @@
* SOFTWARE.
*/
/* $Id: xfrout.c,v 1.68.2.4 2000/12/04 18:59:40 bwelling Exp $ */
/* $Id: xfrout.c,v 1.68.2.5 2001/01/08 20:11:40 gson Exp $ */
#include <config.h>
@ -1233,7 +1233,8 @@ failure:
*/
static void
sendstream(xfrout_ctx_t *xfr) {
dns_message_t *msg = NULL;
dns_message_t *tcpmsg = NULL;
dns_message_t *msg = NULL; /* Client message if UDP, tcpmsg if TCP */
isc_result_t result;
isc_region_t used;
isc_region_t region;
@ -1244,67 +1245,78 @@ sendstream(xfrout_ctx_t *xfr) {
isc_buffer_clear(&xfr->txlenbuf);
isc_buffer_clear(&xfr->txbuf);
/*
* Build a response dns_message_t, temporarily storing the raw,
* uncompressed owner names and RR data contiguously in xfr->buf.
* We know that if the uncompressed data fits in xfr->buf,
* the compressed data will surely fit in a TCP message.
*/
if ((xfr->client->attributes & NS_CLIENTATTR_TCP) == 0) {
/*
* In the UDP case, we put the response data directly into
* the client message.
*/
msg = xfr->client->message;
CHECK(dns_message_reply(msg, ISC_TRUE));
} else {
/*
* TCP. Build a response dns_message_t, temporarily storing
* the raw, uncompressed owner names and RR data contiguously
* in xfr->buf. We know that if the uncompressed data fits
* in xfr->buf, the compressed data will surely fit in a TCP
* message.
*/
msg = NULL;
CHECK(dns_message_create(xfr->mctx, DNS_MESSAGE_INTENTRENDER, &msg));
CHECK(dns_message_create(xfr->mctx,
DNS_MESSAGE_INTENTRENDER, &tcpmsg));
msg = tcpmsg;
msg->id = xfr->id;
msg->rcode = dns_rcode_noerror;
msg->flags = DNS_MESSAGEFLAG_QR | DNS_MESSAGEFLAG_AA;
if ((xfr->client->attributes & NS_CLIENTATTR_RA) != 0)
msg->flags |= DNS_MESSAGEFLAG_RA;
dns_message_settsigkey(msg, xfr->tsigkey);
CHECK(dns_message_setquerytsig(msg, xfr->lasttsig));
if (xfr->lasttsig != NULL)
isc_buffer_free(&xfr->lasttsig);
/*
* Include a question section in the first message only.
* BIND 8.2.1 will not recognize an IXFR if it does not have a
* question section.
*/
if (xfr->nmsg == 0) {
dns_name_t *qname = NULL;
isc_region_t r;
msg->id = xfr->id;
msg->rcode = dns_rcode_noerror;
msg->flags = DNS_MESSAGEFLAG_QR | DNS_MESSAGEFLAG_AA;
if ((xfr->client->attributes & NS_CLIENTATTR_RA) != 0)
msg->flags |= DNS_MESSAGEFLAG_RA;
dns_message_settsigkey(msg, xfr->tsigkey);
CHECK(dns_message_setquerytsig(msg, xfr->lasttsig));
if (xfr->lasttsig != NULL)
isc_buffer_free(&xfr->lasttsig);
/*
* Reserve space for the 12-byte message header
* and 4 bytes of question.
* Include a question section in the first message only.
* BIND 8.2.1 will not recognize an IXFR if it does not
* have a question section.
*/
isc_buffer_add(&xfr->buf, 12 + 4);
if (xfr->nmsg == 0) {
dns_name_t *qname = NULL;
isc_region_t r;
qrdataset = NULL;
result = dns_message_gettemprdataset(msg, &qrdataset);
if (result != ISC_R_SUCCESS)
goto failure;
dns_rdataset_init(qrdataset);
dns_rdataset_makequestion(qrdataset,
xfr->client->message->rdclass,
xfr->qtype);
/*
* Reserve space for the 12-byte message header
* and 4 bytes of question.
*/
isc_buffer_add(&xfr->buf, 12 + 4);
result = dns_message_gettempname(msg, &qname);
if (result != ISC_R_SUCCESS)
goto failure;
dns_name_init(qname, NULL);
isc_buffer_availableregion(&xfr->buf, &r);
INSIST(r.length >= xfr->qname->length);
r.length = xfr->qname->length;
isc_buffer_putmem(&xfr->buf, xfr->qname->ndata,
xfr->qname->length);
dns_name_fromregion(qname, &r);
ISC_LIST_INIT(qname->list);
ISC_LIST_APPEND(qname->list, qrdataset, link);
qrdataset = NULL;
result = dns_message_gettemprdataset(msg, &qrdataset);
if (result != ISC_R_SUCCESS)
goto failure;
dns_rdataset_init(qrdataset);
dns_rdataset_makequestion(qrdataset,
xfr->client->message->rdclass,
xfr->qtype);
dns_message_addname(msg, qname, DNS_SECTION_QUESTION);
result = dns_message_gettempname(msg, &qname);
if (result != ISC_R_SUCCESS)
goto failure;
dns_name_init(qname, NULL);
isc_buffer_availableregion(&xfr->buf, &r);
INSIST(r.length >= xfr->qname->length);
r.length = xfr->qname->length;
isc_buffer_putmem(&xfr->buf, xfr->qname->ndata,
xfr->qname->length);
dns_name_fromregion(qname, &r);
ISC_LIST_INIT(qname->list);
ISC_LIST_APPEND(qname->list, qrdataset, link);
dns_message_addname(msg, qname, DNS_SECTION_QUESTION);
}
else
msg->tcp_continuation = 1;
}
else
msg->tcp_continuation = 1;
/*
* Try to fit in as many RRs as possible, unless "one-answer"
@ -1420,16 +1432,11 @@ sendstream(xfrout_ctx_t *xfr) {
xfr));
xfr->sends++;
} else {
xfrout_log(xfr, ISC_LOG_DEBUG(8),
"sending IXFR UDP response");
/* XXX kludge */
dns_message_destroy(&xfr->client->message);
xfr->client->message = msg;
msg = NULL;
xfrout_log(xfr, ISC_LOG_DEBUG(8), "sending IXFR UDP response");
ns_client_send(xfr->client);
xfr->stream->methods->pause(xfr->stream);
xfrout_ctx_destroy(&xfr);
result = ISC_R_SUCCESS;
goto done;
return;
}
/* Advance lasttsig to be the last TSIG generated */
@ -1441,11 +1448,9 @@ sendstream(xfrout_ctx_t *xfr) {
/*
* XXXRTH need to cleanup qname and qrdataset...
*/
if (msg != NULL) {
dns_message_destroy(&msg);
}
if (tcpmsg != NULL)
dns_message_destroy(&tcpmsg);
done:
/*
* Make sure to release any locks held by database
* iterators before returning from the event handler.