nchan.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "includes.h"
#pragma ident "%Z%%M% %I% %E% SMI"
#include "ssh1.h"
#include "ssh2.h"
#include "buffer.h"
#include "packet.h"
#include "channels.h"
#include "compat.h"
#include "log.h"
/*
* SSH Protocol 1.5 aka New Channel Protocol
* Thanks to Martina, Axel and everyone who left Erlangen, leaving me bored.
* Written by Markus Friedl in October 1999
*
* Protocol versions 1.3 and 1.5 differ in the handshake protocol used for the
* tear down of channels:
*
* 1.3: strict request-ack-protocol:
* CLOSE ->
* <- CLOSE_CONFIRM
*
* 1.5: uses variations of:
* IEOF ->
* <- OCLOSE
* <- IEOF
* OCLOSE ->
* i.e. both sides have to close the channel
*
* 2.0: the EOF messages are optional
*
* See the debugging output from 'ssh -v' and 'sshd -d' of
* ssh-1.2.27 as an example.
*
*/
/* functions manipulating channel states */
/*
*/
/*
* ACTIONS: should never update the channel states
*/
static void chan_send_ieof1(Channel *);
static void chan_send_oclose1(Channel *);
static void chan_send_close2(Channel *);
static void chan_send_eof2(Channel *);
/* helper */
static void chan_shutdown_write(Channel *);
static void chan_shutdown_read(Channel *);
static void
{
}
static void
{
}
/*
* SSH1 specific implementation of event functions
*/
static void
{
switch (c->istate) {
case CHAN_INPUT_WAIT_OCLOSE:
break;
case CHAN_INPUT_OPEN:
chan_send_ieof1(c);
break;
case CHAN_INPUT_WAIT_DRAIN:
/* both local read_failed and remote write_failed */
chan_send_ieof1(c);
break;
default:
error("channel %d: protocol error: rcvd_oclose for istate %d",
return;
}
}
void
{
switch (c->istate) {
case CHAN_INPUT_OPEN:
break;
default:
error("channel %d: chan_read_failed for istate %d",
break;
}
}
void
{
if (buffer_len(&c->input)) {
error("channel %d: chan_ibuf_empty for non empty buffer",
c->self);
return;
}
switch (c->istate) {
case CHAN_INPUT_WAIT_DRAIN:
if (compat20) {
if (!(c->flags & CHAN_CLOSE_SENT))
chan_send_eof2(c);
} else {
chan_send_ieof1(c);
}
break;
default:
error("channel %d: chan_ibuf_empty for istate %d",
break;
}
}
static void
{
switch (c->ostate) {
case CHAN_OUTPUT_OPEN:
break;
case CHAN_OUTPUT_WAIT_IEOF:
break;
default:
error("channel %d: protocol error: rcvd_ieof for ostate %d",
break;
}
}
static void
{
switch (c->ostate) {
case CHAN_OUTPUT_OPEN:
break;
case CHAN_OUTPUT_WAIT_DRAIN:
break;
default:
error("channel %d: chan_write_failed for ostate %d",
break;
}
}
void
{
if (buffer_len(&c->output)) {
error("channel %d: chan_obuf_empty for non empty buffer",
c->self);
return;
}
switch (c->ostate) {
case CHAN_OUTPUT_WAIT_DRAIN:
if (!compat20)
break;
default:
error("channel %d: internal error: obuf_empty for ostate %d",
break;
}
}
static void
{
switch (c->istate) {
case CHAN_INPUT_OPEN:
case CHAN_INPUT_WAIT_DRAIN:
packet_put_int(c->remote_id);
packet_send();
break;
default:
error("channel %d: cannot send ieof for istate %d",
break;
}
}
static void
{
switch (c->ostate) {
case CHAN_OUTPUT_OPEN:
case CHAN_OUTPUT_WAIT_DRAIN:
buffer_clear(&c->output);
packet_put_int(c->remote_id);
packet_send();
break;
default:
error("channel %d: cannot send oclose for ostate %d",
break;
}
}
/*
* the same for SSH2
*/
static void
{
if (c->flags & CHAN_CLOSE_RCVD)
c->flags |= CHAN_CLOSE_RCVD;
if (c->type == SSH_CHANNEL_LARVAL) {
/* tear down larval channels immediately */
return;
}
switch (c->ostate) {
case CHAN_OUTPUT_OPEN:
/*
* wait until a data from the channel is consumed if a CLOSE
* is received
*/
break;
}
switch (c->istate) {
case CHAN_INPUT_OPEN:
break;
case CHAN_INPUT_WAIT_DRAIN:
chan_send_eof2(c);
break;
}
}
static void
{
c->flags |= CHAN_EOF_RCVD;
if (c->ostate == CHAN_OUTPUT_OPEN)
}
static void
{
switch (c->ostate) {
case CHAN_OUTPUT_OPEN:
case CHAN_OUTPUT_WAIT_DRAIN:
break;
default:
error("channel %d: chan_write_failed for ostate %d",
break;
}
}
static void
{
switch (c->istate) {
case CHAN_INPUT_WAIT_DRAIN:
packet_put_int(c->remote_id);
packet_send();
c->flags |= CHAN_EOF_SENT;
break;
default:
error("channel %d: cannot send eof for istate %d",
break;
}
}
static void
{
if (c->ostate != CHAN_OUTPUT_CLOSED ||
c->istate != CHAN_INPUT_CLOSED) {
} else if (c->flags & CHAN_CLOSE_SENT) {
} else {
packet_put_int(c->remote_id);
packet_send();
c->flags |= CHAN_CLOSE_SENT;
}
}
/* shared */
void
{
if (compat20)
chan_rcvd_eof2(c);
else
chan_rcvd_ieof1(c);
if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN &&
buffer_len(&c->output) == 0 &&
chan_obuf_empty(c);
}
void
{
if (compat20)
chan_rcvd_close2(c);
else
}
void
{
if (compat20)
else
}
void
{
c->type = SSH_CHANNEL_ZOMBIE;
}
int
{
if (c->type == SSH_CHANNEL_ZOMBIE) {
return 1;
}
return 0;
if (!compat20) {
return 1;
}
if ((datafellows & SSH_BUG_EXTEOF) &&
c->extended_usage == CHAN_EXTENDED_WRITE &&
c->efd != -1 &&
buffer_len(&c->extended) > 0) {
debug2("channel %d: active efd: %d len %d",
return 0;
}
if (!(c->flags & CHAN_CLOSE_SENT)) {
if (send) {
chan_send_close2(c);
} else {
/* channel would be dead if we sent a close */
if (c->flags & CHAN_CLOSE_RCVD) {
debug("channel %d: almost dead",
c->self);
return 1;
}
}
}
if ((c->flags & CHAN_CLOSE_SENT) &&
(c->flags & CHAN_CLOSE_RCVD)) {
return 1;
}
return 0;
}
/* helper */
static void
{
buffer_clear(&c->output);
return;
/* shutdown failure is allowed if write failed already */
if (c->sock != -1) {
debug("channel %d: chan_shutdown_write: "
"shutdown() failed for fd%d: %.100s",
} else {
if (channel_close_fd(&c->wfd) < 0)
log("channel %d: chan_shutdown_write: "
"close() failed for fd%d: %.100s",
}
}
static void
{
return;
if (c->sock != -1) {
/*
* shutdown(sock, SHUT_READ) may return ENOTCONN if the
* write side has been closed already. (bug on Linux)
* HP-UX may return ENOTCONN also.
*/
error("channel %d: chan_shutdown_read: "
"shutdown() failed for fd%d [i%d o%d]: %.100s",
} else {
if (channel_close_fd(&c->rfd) < 0)
log("channel %d: chan_shutdown_read: "
"close() failed for fd%d: %.100s",
}
}