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Add isc__nm_senddns()

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The new internal function works in the same way as isc_nm_send()
except that it sends a DNS message size ahead of the DNS message
data (the format used in DNS over TCP).

The intention is to provide a fast path for sending DNS messages over
streams protocols - that is, without allocating any intermediate
memory buffers.
This commit is contained in:
Artem Boldariev
2022-12-07 13:33:52 +02:00
parent 56732ac2a0
commit ad876a65af
3 changed files with 92 additions and 15 deletions
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14
lib/isc/netmgr/netmgr.c
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@@ -1873,6 +1873,20 @@ isc_nm_send(isc_nmhandle_t *handle, isc_region_t *region, isc_nm_cb_t cb,
}
}
void
isc__nm_senddns(isc_nmhandle_t *handle, isc_region_t *region, isc_nm_cb_t cb,
void *cbarg) {
REQUIRE(VALID_NMHANDLE(handle));
switch (handle->sock->type) {
case isc_nm_tcpsocket:
isc__nm_tcp_senddns(handle, region, cb, cbarg);
break;
default:
UNREACHABLE();
}
}
void
isc_nm_read(isc_nmhandle_t *handle, isc_nm_recv_cb_t cb, void *cbarg) {
REQUIRE(VALID_NMHANDLE(handle));