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upstream: Use sshbuf_read() to read directly into the channel input 

buffer rather than into a stack buffer that needs to be copied again;
Improves performance by about 1% on cipher-speed.sh feedback dtucker@ ok
markus@

OpenBSD-Commit-ID: bf5e6e3c821ac3546dc8241d8a94e70d47716572
This commit is contained in:
djm@openbsd.org 2022-01-22 00:45:31 +00:00 committed by Damien Miller
parent 29a76994e2
commit a1a8efeaaa
1 changed files with 41 additions and 9 deletions
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50
channels.c
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@ -1,4 +1,4 @@
/* $OpenBSD: channels.c,v 1.411 2022/01/06 21:48:38 djm Exp $ */
/* $OpenBSD: channels.c,v 1.412 2022/01/22 00:45:31 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -1919,25 +1919,56 @@ channel_handle_rfd(struct ssh *ssh, Channel *c)
char buf[CHAN_RBUF];
ssize_t len;
int r, force;
size_t have, avail, maxlen = CHANNEL_MAX_READ;
int pty_zeroread = 0;
#ifdef PTY_ZEROREAD
/* Bug on AIX: read(1) can return 0 for a non-closed fd */
pty_zeroread = c->isatty;
#endif
force = c->isatty && c->detach_close && c->istate != CHAN_INPUT_CLOSED;
if (!force && (c->io_ready & SSH_CHAN_IO_RFD) == 0)
return 1;
if ((avail = sshbuf_avail(c->input)) == 0)
return 1; /* Shouldn't happen */
/*
* For "simple" channels (i.e. not datagram or filtered), we can
* read directly to the channel buffer.
*/
if (!pty_zeroread && c->input_filter == NULL && !c->datagram) {
/* Only OPEN channels have valid rwin */
if (c->type == SSH_CHANNEL_OPEN) {
if ((have = sshbuf_len(c->input)) >= c->remote_window)
return 1; /* shouldn't happen */
if (maxlen > c->remote_window - have)
maxlen = c->remote_window - have;
}
if (maxlen > avail)
maxlen = avail;
if ((r = sshbuf_read(c->rfd, c->input, maxlen, NULL)) != 0) {
debug2("channel %d: read failed rfd %d maxlen %zu: %s",
c->self, c->rfd, maxlen, ssh_err(r));
goto rfail;
}
return 1;
}
errno = 0;
len = read(c->rfd, buf, sizeof(buf));
/* fixup AIX zero-length read with errno set to look more like errors */
if (pty_zeroread && len == 0 && errno != 0)
len = -1;
if (len == -1 && (errno == EINTR ||
((errno == EAGAIN || errno == EWOULDBLOCK) && !force)))
return 1;
#ifndef PTY_ZEROREAD
if (len <= 0) {
#else
if ((!c->isatty && len <= 0) ||
(c->isatty && (len < 0 || (len == 0 && errno != 0)))) {
#endif
debug2("channel %d: read<=0 rfd %d len %zd",
c->self, c->rfd, len);
if (len < 0 || (!pty_zeroread && len == 0)) {
debug2("channel %d: read<=0 rfd %d len %zd: %s",
c->self, c->rfd, len,
len == 0 ? "closed" : strerror(errno));
rfail:
if (c->type != SSH_CHANNEL_OPEN) {
debug2("channel %d: not open", c->self);
chan_mark_dead(ssh, c);
@ -1957,6 +1988,7 @@ channel_handle_rfd(struct ssh *ssh, Channel *c)
fatal_fr(r, "channel %i: put datagram", c->self);
} else if ((r = sshbuf_put(c->input, buf, len)) != 0)
fatal_fr(r, "channel %i: put data", c->self);
return 1;
}