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Add TCP, TCPDNS and TLSDNS write timer

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When the outgoing TCP write buffers are full because the other party is
not reading the data, the uv_write() could wait indefinitely on the
uv_loop and never calling the callback.  Add a new write timer that uses
the `tcp-idle-timeout` value to interrupt the TCP connection when we are
not able to send data for defined period of time.
This commit is contained in:
Ondřej Surý
2022-02-09 11:21:04 +01:00
parent cd3b58622c
commit 408b362169
6 changed files with 215 additions and 30 deletions
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18
lib/isc/netmgr/netmgr.c
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@@ -2070,7 +2070,21 @@ isc__nm_accept_connection_log(isc_result_t result, bool can_log_quota) {
isc_result_totext(result));
}
static void
void
isc__nmsocket_writetimeout_cb(uv_timer_t *timer) {
isc_nmsocket_t *sock = uv_handle_get_data((uv_handle_t *)timer);
int r = uv_timer_stop(&sock->write_timer);
UV_RUNTIME_CHECK(uv_timer_stop, r);
/* The shutdown will be handled in the respective close functions */
r = uv_tcp_close_reset(&sock->uv_handle.tcp, NULL);
UV_RUNTIME_CHECK(uv_tcp_close_reset, r);
isc__nmsocket_shutdown(sock);
}
void
isc__nmsocket_readtimeout_cb(uv_timer_t *timer) {
isc_nmsocket_t *sock = uv_handle_get_data((uv_handle_t *)timer);
@@ -2447,6 +2461,8 @@ isc_nmhandle_keepalive(isc_nmhandle_t *handle, bool value) {
atomic_store(&sock->keepalive, value);
sock->read_timeout = value ? atomic_load(&sock->mgr->keepalive)
: atomic_load(&sock->mgr->idle);
sock->write_timeout = value ? atomic_load(&sock->mgr->keepalive)
: atomic_load(&sock->mgr->idle);
break;
#if HAVE_LIBNGHTTP2
case isc_nm_tlssocket: