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Handle EDNS induced FORMERR responses

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If we are talking to a non EDNS aware primary that returns FORMERR
to EDNS requests retry the request without using EDNS.
This commit is contained in:
Mark Andrews 2023-07-04 14:22:29 +10:00
parent 690fd050a0
commit be21d31840
1 changed files with 16 additions and 4 deletions
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20
lib/dns/xfrin.c
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@ -142,7 +142,7 @@ struct dns_xfrin {
xfrin_state_t state;
uint32_t end_serial;
bool is_ixfr;
bool edns, is_ixfr;
unsigned int nmsg; /*%< Number of messages recvd */
unsigned int nrecs; /*%< Number of records recvd */
@ -861,6 +861,7 @@ xfrin_create(isc_mem_t *mctx, dns_zone_t *zone, dns_db_t *db,
.primaryaddr = *primaryaddr,
.sourceaddr = *sourceaddr,
.firstsoa = DNS_RDATA_INIT,
.edns = true,
.magic = XFRIN_MAGIC,
};
@ -1193,7 +1194,7 @@ xfrin_send_request(dns_xfrin_t *xfr) {
dns_name_t *qname = NULL;
dns_dbversion_t *ver = NULL;
dns_name_t *msgsoaname = NULL;
bool edns = true;
bool edns = xfr->edns;
bool reqnsid = xfr->view->requestnsid;
bool reqexpire = dns_zone_getrequestexpire(xfr->zone);
uint16_t udpsize = dns_view_getudpsize(xfr->view);
@ -1235,7 +1236,7 @@ xfrin_send_request(dns_xfrin_t *xfr) {
&xfr->ixfr.request_serial));
}
if (xfr->view->peers != NULL) {
if (edns && xfr->view->peers != NULL) {
dns_peer_t *peer = NULL;
isc_netaddr_t primaryip;
isc_netaddr_fromsockaddr(&primaryip, &xfr->primaryaddr);
@ -1379,7 +1380,17 @@ xfrin_recv_done(isc_result_t result, isc_region_t *region, void *arg) {
if (result != ISC_R_SUCCESS || msg->rcode != dns_rcode_noerror ||
msg->opcode != dns_opcode_query || msg->rdclass != xfr->rdclass)
{
if (result == ISC_R_SUCCESS && msg->rcode != dns_rcode_noerror)
if (result == ISC_R_SUCCESS &&
msg->rcode == dns_rcode_formerr && xfr->edns &&
(xfr->state == XFRST_SOAQUERY ||
xfr->state == XFRST_INITIALSOA))
{
xfr->edns = false;
dns_message_detach(&msg);
xfrin_reset(xfr);
goto try_again;
} else if (result == ISC_R_SUCCESS &&
msg->rcode != dns_rcode_noerror)
{
result = dns_result_fromrcode(msg->rcode);
} else if (result == ISC_R_SUCCESS &&
@ -1408,6 +1419,7 @@ xfrin_recv_done(isc_result_t result, isc_region_t *region, void *arg) {
xfrin_reset(xfr);
xfr->reqtype = dns_rdatatype_soa;
xfr->state = XFRST_SOAQUERY;
try_again:
result = xfrin_start(xfr);
if (result != ISC_R_SUCCESS) {
xfrin_fail(xfr, result, "failed setting up socket");