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upstream: replace select() with ppoll(), including converting 

timeval's to timespec's to make things easier. back and forth and ok; djm

OpenBSD-Commit-ID: 89d3b23c60875da919e7820f9de6213286ffbec9
This commit is contained in:
deraadt@openbsd.org 2021-11-13 21:14:13 +00:00 committed by Damien Miller
parent 7c025c0055
commit 6582a31c38
3 changed files with 26 additions and 45 deletions

8
misc.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: misc.c,v 1.170 2021/09/26 14:01:03 djm Exp $ */
/* $OpenBSD: misc.c,v 1.171 2021/11/13 21:14:13 deraadt Exp $ */
/*
* Copyright (c) 2000 Markus Friedl. All rights reserved.
* Copyright (c) 2005-2020 Damien Miller. All rights reserved.
@ -1616,12 +1616,12 @@ ms_subtract_diff(struct timeval *start, int *ms)
}
void
ms_to_timeval(struct timeval *tv, int ms)
ms_to_timespec(struct timespec *ts, int ms)
{
if (ms < 0)
ms = 0;
tv->tv_sec = ms / 1000;
tv->tv_usec = (ms % 1000) * 1000;
ts->tv_sec = ms / 1000;
ts->tv_nsec = (ms % 1000) * 1000 * 1000;
}
void

4
misc.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: misc.h,v 1.98 2021/08/09 23:47:44 djm Exp $ */
/* $OpenBSD: misc.h,v 1.99 2021/11/13 21:14:13 deraadt Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
@ -82,7 +82,7 @@ void xextendf(char **s, const char *sep, const char *fmt, ...)
__attribute__((__format__ (printf, 3, 4))) __attribute__((__nonnull__ (3)));
void sanitise_stdfd(void);
void ms_subtract_diff(struct timeval *, int *);
void ms_to_timeval(struct timeval *, int);
void ms_to_timespec(struct timespec *, int);
void monotime_ts(struct timespec *);
void monotime_tv(struct timeval *);
time_t monotime(void);

59
packet.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: packet.c,v 1.301 2021/07/16 09:00:23 djm Exp $ */
/* $OpenBSD: packet.c,v 1.302 2021/11/13 21:14:13 deraadt Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -1325,17 +1325,13 @@ ssh_packet_read_seqnr(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
{
struct session_state *state = ssh->state;
int len, r, ms_remain;
fd_set *setp;
struct pollfd pfd;
char buf[8192];
struct timeval timeout, start, *timeoutp = NULL;
struct timeval start;
struct timespec timespec, *timespecp = NULL;
DBG(debug("packet_read()"));
setp = calloc(howmany(state->connection_in + 1,
NFDBITS), sizeof(fd_mask));
if (setp == NULL)
return SSH_ERR_ALLOC_FAIL;
/*
* Since we are blocking, ensure that all written packets have
* been sent.
@ -1356,22 +1352,20 @@ ssh_packet_read_seqnr(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
* Otherwise, wait for some data to arrive, add it to the
* buffer, and try again.
*/
memset(setp, 0, howmany(state->connection_in + 1,
NFDBITS) * sizeof(fd_mask));
FD_SET(state->connection_in, setp);
pfd.fd = state->connection_in;
pfd.events = POLLIN;
if (state->packet_timeout_ms > 0) {
ms_remain = state->packet_timeout_ms;
timeoutp = &timeout;
timespecp = &timespec;
}
/* Wait for some data to arrive. */
for (;;) {
if (state->packet_timeout_ms > 0) {
ms_to_timeval(&timeout, ms_remain);
ms_to_timespec(&timespec, ms_remain);
monotime_tv(&start);
}
if ((r = select(state->connection_in + 1, setp,
NULL, NULL, timeoutp)) >= 0)
if ((r = ppoll(&pfd, 1, timespecp, NULL)) >= 0)
break;
if (errno != EAGAIN && errno != EINTR &&
errno != EWOULDBLOCK) {
@ -1406,7 +1400,6 @@ ssh_packet_read_seqnr(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
goto out;
}
out:
free(setp);
return r;
}
@ -1986,35 +1979,28 @@ ssh_packet_write_poll(struct ssh *ssh)
int
ssh_packet_write_wait(struct ssh *ssh)
{
fd_set *setp;
int ret, r, ms_remain = 0;
struct timeval start, timeout, *timeoutp = NULL;
struct timeval start;
struct timespec timespec, *timespecp = NULL;
struct session_state *state = ssh->state;
struct pollfd pfd;
setp = calloc(howmany(state->connection_out + 1,
NFDBITS), sizeof(fd_mask));
if (setp == NULL)
return SSH_ERR_ALLOC_FAIL;
if ((r = ssh_packet_write_poll(ssh)) != 0) {
free(setp);
if ((r = ssh_packet_write_poll(ssh)) != 0)
return r;
}
while (ssh_packet_have_data_to_write(ssh)) {
memset(setp, 0, howmany(state->connection_out + 1,
NFDBITS) * sizeof(fd_mask));
FD_SET(state->connection_out, setp);
pfd.fd = state->connection_out;
pfd.events = POLLOUT;
if (state->packet_timeout_ms > 0) {
ms_remain = state->packet_timeout_ms;
timeoutp = &timeout;
timespecp = &timespec;
}
for (;;) {
if (state->packet_timeout_ms > 0) {
ms_to_timeval(&timeout, ms_remain);
ms_to_timespec(&timespec, ms_remain);
monotime_tv(&start);
}
if ((ret = select(state->connection_out + 1,
NULL, setp, NULL, timeoutp)) >= 0)
if ((ret = ppoll(&pfd, 1, timespecp, NULL)) >= 0)
break;
if (errno != EAGAIN && errno != EINTR &&
errno != EWOULDBLOCK)
@ -2027,16 +2013,11 @@ ssh_packet_write_wait(struct ssh *ssh)
break;
}
}
if (ret == 0) {
free(setp);
if (ret == 0)
return SSH_ERR_CONN_TIMEOUT;
}
if ((r = ssh_packet_write_poll(ssh)) != 0) {
free(setp);
if ((r = ssh_packet_write_poll(ssh)) != 0)
return r;
}
}
free(setp);
return 0;
}