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fix ClientAliveInterval when a time-based RekeyLimit is
 set; previously keepalive packets were not being sent. bz#2252 report and
 analysis by Christian Wittenhorst and Garrett Lee feedback and ok dtucker@

Upstream-ID: d48f9deadd35fdacdd5106b41bb07630ddd4aa81
This commit is contained in:
djm@openbsd.org 2016-03-04 03:35:44 +00:00 committed by Damien Miller
parent 8ef04d7a94
commit 988e429d90
1 changed files with 15 additions and 13 deletions
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28
serverloop.c
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@ -1,4 +1,4 @@
/* $OpenBSD: serverloop.c,v 1.182 2016/02/08 10:57:07 djm Exp $ */
/* $OpenBSD: serverloop.c,v 1.183 2016/03/04 03:35:44 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -276,7 +276,7 @@ client_alive_check(void)
*/
static void
wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
u_int *nallocp, u_int64_t max_time_milliseconds)
u_int *nallocp, u_int64_t max_time_ms)
{
struct timeval tv, *tvp;
int ret;
@ -288,9 +288,9 @@ wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
channel_prepare_select(readsetp, writesetp, maxfdp, nallocp,
&minwait_secs, 0);
/* XXX need proper deadline system for rekey/client alive */
if (minwait_secs != 0)
max_time_milliseconds = MIN(max_time_milliseconds,
(u_int)minwait_secs * 1000);
max_time_ms = MIN(max_time_ms, (u_int)minwait_secs * 1000);
/*
* if using client_alive, set the max timeout accordingly,
@ -300,11 +300,13 @@ wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
* this could be randomized somewhat to make traffic
* analysis more difficult, but we're not doing it yet.
*/
if (compat20 &&
max_time_milliseconds == 0 && options.client_alive_interval) {
if (compat20 && options.client_alive_interval) {
uint64_t keepalive_ms =
(uint64_t)options.client_alive_interval * 1000;
client_alive_scheduled = 1;
max_time_milliseconds =
(u_int64_t)options.client_alive_interval * 1000;
if (max_time_ms == 0 || max_time_ms > keepalive_ms)
max_time_ms = keepalive_ms;
}
if (compat20) {
@ -353,14 +355,14 @@ wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
* from it, then read as much as is available and exit.
*/
if (child_terminated && packet_not_very_much_data_to_write())
if (max_time_milliseconds == 0 || client_alive_scheduled)
max_time_milliseconds = 100;
if (max_time_ms == 0 || client_alive_scheduled)
max_time_ms = 100;
if (max_time_milliseconds == 0)
if (max_time_ms == 0)
tvp = NULL;
else {
tv.tv_sec = max_time_milliseconds / 1000;
tv.tv_usec = 1000 * (max_time_milliseconds % 1000);
tv.tv_sec = max_time_ms / 1000;
tv.tv_usec = 1000 * (max_time_ms % 1000);
tvp = &tv;
}