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upstream: Try to continue running local I/O for channels in state

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OPEN during SSH transport rekeying. The most visible benefit is that it
should make ~-escapes work in the client (e.g. to exit) if the connection
happened to have stalled during a rekey event. Based work by and ok dtucker@

OpenBSD-Commit-ID: a66e8f254e92edd4ce09c9f750883ec8f1ea5f45
This commit is contained in:
djm@openbsd.org 2022-04-20 04:19:11 +00:00 committed by Damien Miller
parent e68154b0d4
commit fec014785d
3 changed files with 10 additions and 13 deletions
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9
channels.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: channels.c,v 1.416 2022/04/11 22:52:08 djm Exp $ */
/* $OpenBSD: channels.c,v 1.417 2022/04/20 04:19:11 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -2420,6 +2420,9 @@ channel_handler(struct ssh *ssh, int table, time_t *unpause_secs)
c = sc->channels[i];
if (c == NULL)
continue;
/* Try to keep IO going while rekeying */
if (ssh_packet_is_rekeying(ssh) && c->type != SSH_CHANNEL_OPEN)
continue;
if (c->delayed) {
if (table == CHAN_PRE)
c->delayed = 0;
@ -2610,7 +2613,6 @@ channel_prepare_poll(struct ssh *ssh, struct pollfd **pfdp, u_int *npfd_allocp,
/* Allocate 4x pollfd for each channel (rfd, wfd, efd, sock) */
if (sc->channels_alloc >= (INT_MAX / 4) - npfd_reserved)
fatal_f("too many channels"); /* shouldn't happen */
if (!ssh_packet_is_rekeying(ssh))
npfd += sc->channels_alloc * 4;
if (npfd > *npfd_allocp) {
*pfdp = xrecallocarray(*pfdp, *npfd_allocp,
@ -2618,9 +2620,6 @@ channel_prepare_poll(struct ssh *ssh, struct pollfd **pfdp, u_int *npfd_allocp,
*npfd_allocp = npfd;
}
*npfd_activep = npfd_reserved;
if (ssh_packet_is_rekeying(ssh))
return;
oalloc = sc->channels_alloc;
channel_handler(ssh, CHAN_PRE, minwait_secs);

5
clientloop.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: clientloop.c,v 1.378 2022/01/22 00:49:34 djm Exp $ */
/* $OpenBSD: clientloop.c,v 1.379 2022/04/20 04:19:11 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -1348,8 +1348,7 @@ client_loop(struct ssh *ssh, int have_pty, int escape_char_arg,
if (quit_pending)
break;
/* Do channel operations unless rekeying in progress. */
if (!ssh_packet_is_rekeying(ssh))
/* Do channel operations. */
channel_after_poll(ssh, pfd, npfd_active);
/* Buffer input from the connection. */

3
serverloop.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: serverloop.c,v 1.231 2022/01/22 00:49:34 djm Exp $ */
/* $OpenBSD: serverloop.c,v 1.232 2022/04/20 04:19:11 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -392,7 +392,6 @@ server_loop2(struct ssh *ssh, Authctxt *authctxt)
cleanup_exit(255);
}
if (!ssh_packet_is_rekeying(ssh))
channel_after_poll(ssh, pfd, npfd_active);
if (conn_in_ready &&
process_input(ssh, connection_in) < 0)