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DoH: Add isc_nm_set_min_answer_ttl()

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This commit adds an isc_nm_set_min_answer_ttl() function which is
intended to to be used to give a hint to the underlying transport
regarding the answer TTL.

The interface is intentionally kept generic because over time more
transports might benefit from this functionality, but currently it is
intended for DoH to set "max-age" value within "Cache-Control" HTTP
header (as recommended in the RFC8484, section 5.1 "Cache
Interaction").

It is no-op for other DNS transports for the time being.
This commit is contained in:
Artem Boldariev
2021-10-06 14:09:53 +03:00
parent b69dfd6a75
commit 80482f8d3e
4 changed files with 101 additions and 14 deletions
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32
lib/isc/netmgr/netmgr.c
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@@ -3456,6 +3456,38 @@ isc_nm_is_tlsdns_handle(isc_nmhandle_t *handle) {
return (handle->sock->type == isc_nm_tlsdnssocket);
}
void
isc_nm_set_maxage(isc_nmhandle_t *handle, const uint32_t ttl) {
isc_nmsocket_t *sock;
REQUIRE(VALID_NMHANDLE(handle));
REQUIRE(VALID_NMSOCK(handle->sock));
REQUIRE(!atomic_load(&handle->sock->client));
sock = handle->sock;
switch (sock->type) {
#if HAVE_LIBNGHTTP2
case isc_nm_httpsocket:
isc__nm_http_set_maxage(handle, ttl);
break;
#endif /* HAVE_LIBNGHTTP2 */
case isc_nm_udpsocket:
case isc_nm_tcpdnssocket:
case isc_nm_tlsdnssocket:
return;
break;
case isc_nm_tcpsocket:
#if HAVE_LIBNGHTTP2
case isc_nm_tlssocket:
#endif /* HAVE_LIBNGHTTP2 */
default:
INSIST(0);
ISC_UNREACHABLE();
break;
}
}
#ifdef NETMGR_TRACE
/*
* Dump all active sockets in netmgr. We output to stderr