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enable keepalive when the keepalive EDNS option is seen

Browse Source 
previously, receiving a keepalive option had no effect on how
long named would keep the connection open; there was a place to
configure the keepalive timeout but it was never used. this commit
corrects that.

this also fixes an error in isc__nm_{tcp,tls}dns_keepalive()
in which the sense of a REQUIRE test was reversed; previously this
error had not been noticed because the functions were not being
used.
This commit is contained in:
Evan Hunt 2020-11-02 18:33:20 -08:00
parent 19e24e22f5
commit 7867b8b57d
5 changed files with 31 additions and 2 deletions
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12
lib/isc/include/isc/netmgr.h
View File

@ -161,6 +161,18 @@ isc_nmhandle_cleartimeout(isc_nmhandle_t *handle);
* both socket layers.
*/
void
isc_nmhandle_keepalive(isc_nmhandle_t *handle, bool value);
/*%<
* Enable/disable keepalive on this connection by setting it to 'value'.
*
* When keepalive is active, we switch to using the keepalive timeout
* to determine when to close a connection, rather than the idle timeout.
*
* This applies only to TCP-based DNS connections (i.e., TCPDNS or
* TLSDNS). On other types of connection it has no effect.
*/
isc_sockaddr_t
isc_nmhandle_peeraddr(isc_nmhandle_t *handle);
/*%<

16
lib/isc/netmgr/netmgr.c
View File

@ -2365,6 +2365,22 @@ isc_nmhandle_settimeout(isc_nmhandle_t *handle, uint32_t timeout) {
}
}
void
isc_nmhandle_keepalive(isc_nmhandle_t *handle, bool value) {
REQUIRE(VALID_NMHANDLE(handle));
switch (handle->sock->type) {
case isc_nm_tcpdnssocket:
isc__nm_tcpdns_keepalive(handle, value);
break;
case isc_nm_tlsdnssocket:
isc__nm_tlsdns_keepalive(handle, value);
break;
default:
return;
}
}
void *
isc_nmhandle_getextra(isc_nmhandle_t *handle) {
REQUIRE(VALID_NMHANDLE(handle));

2
lib/isc/netmgr/tcpdns.c
View File

@ -1442,7 +1442,7 @@ isc__nm_tcpdns_keepalive(isc_nmhandle_t *handle, bool value) {
REQUIRE(VALID_NMHANDLE(handle));
REQUIRE(VALID_NMSOCK(handle->sock));
REQUIRE(handle->sock->type != isc_nm_tcpdnssocket);
REQUIRE(handle->sock->type == isc_nm_tcpdnssocket);
sock = handle->sock;

2
lib/isc/netmgr/tlsdns.c
View File

@ -2012,7 +2012,7 @@ isc__nm_tlsdns_keepalive(isc_nmhandle_t *handle, bool value) {
REQUIRE(VALID_NMHANDLE(handle));
REQUIRE(VALID_NMSOCK(handle->sock));
REQUIRE(handle->sock->type != isc_nm_tlsdnssocket);
REQUIRE(handle->sock->type == isc_nm_tlsdnssocket);
sock = handle->sock;

1
lib/ns/client.c
View File

@ -1508,6 +1508,7 @@ process_opt(ns_client_t *client, dns_rdataset_t *opt) {
}
client->attributes |=
NS_CLIENTATTR_USEKEEPALIVE;
isc_nmhandle_keepalive(client->handle, true);
isc_buffer_forward(&optbuf, optlen);
break;
case DNS_OPT_PAD: