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/*
* 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
* documentation and/or other materials provided with the distribution.
*
* 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"
RCSID("$OpenBSD: nchan.c,v 1.45 2002/03/25 21:13:51 markus Exp $");
#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 */
/*
* EVENTS update channel input/output states execute ACTIONS
*/
/*
* 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 char *ostates[] = { "open", "drain", "wait_ieof", "closed" };
static char *istates[] = { "open", "drain", "wait_oclose", "closed" };
static void
chan_set_istate(Channel *c, u_int next)
{
if (c->istate > CHAN_INPUT_CLOSED || next > CHAN_INPUT_CLOSED)
fatal("chan_set_istate: bad state %d -> %d", c->istate, next);
debug("channel %d: input %s -> %s", c->self, istates[c->istate],
istates[next]);
c->istate = next;
}
static void
chan_set_ostate(Channel *c, u_int next)
{
if (c->ostate > CHAN_OUTPUT_CLOSED || next > CHAN_OUTPUT_CLOSED)
fatal("chan_set_ostate: bad state %d -> %d", c->ostate, next);
debug("channel %d: output %s -> %s", c->self, ostates[c->ostate],
ostates[next]);
c->ostate = next;
}
/*
* SSH1 specific implementation of event functions
*/
static void
chan_rcvd_oclose1(Channel *c)
{
debug("channel %d: rcvd oclose", c->self);
switch (c->istate) {
case CHAN_INPUT_WAIT_OCLOSE:
chan_set_istate(c, CHAN_INPUT_CLOSED);
break;
case CHAN_INPUT_OPEN:
chan_shutdown_read(c);
chan_send_ieof1(c);
chan_set_istate(c, CHAN_INPUT_CLOSED);
break;
case CHAN_INPUT_WAIT_DRAIN:
/* both local read_failed and remote write_failed */
chan_send_ieof1(c);
chan_set_istate(c, CHAN_INPUT_CLOSED);
break;
default:
error("channel %d: protocol error: rcvd_oclose for istate %d",
c->self, c->istate);
return;
}
}
void
chan_read_failed(Channel *c)
{
debug("channel %d: read failed", c->self);
switch (c->istate) {
case CHAN_INPUT_OPEN:
chan_shutdown_read(c);
chan_set_istate(c, CHAN_INPUT_WAIT_DRAIN);
break;
default:
error("channel %d: chan_read_failed for istate %d",
c->self, c->istate);
break;
}
}
void
chan_ibuf_empty(Channel *c)
{
debug("channel %d: ibuf empty", c->self);
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);
chan_set_istate(c, CHAN_INPUT_CLOSED);
} else {
chan_send_ieof1(c);
chan_set_istate(c, CHAN_INPUT_WAIT_OCLOSE);
}
break;
default:
error("channel %d: chan_ibuf_empty for istate %d",
c->self, c->istate);
break;
}
}
static void
chan_rcvd_ieof1(Channel *c)
{
debug("channel %d: rcvd ieof", c->self);
switch (c->ostate) {
case CHAN_OUTPUT_OPEN:
chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN);
break;
case CHAN_OUTPUT_WAIT_IEOF:
chan_set_ostate(c, CHAN_OUTPUT_CLOSED);
break;
default:
error("channel %d: protocol error: rcvd_ieof for ostate %d",
c->self, c->ostate);
break;
}
}
static void
chan_write_failed1(Channel *c)
{
debug("channel %d: write failed", c->self);
switch (c->ostate) {
case CHAN_OUTPUT_OPEN:
chan_shutdown_write(c);
chan_send_oclose1(c);
chan_set_ostate(c, CHAN_OUTPUT_WAIT_IEOF);
break;
case CHAN_OUTPUT_WAIT_DRAIN:
chan_shutdown_write(c);
chan_send_oclose1(c);
chan_set_ostate(c, CHAN_OUTPUT_CLOSED);
break;
default:
error("channel %d: chan_write_failed for ostate %d",
c->self, c->ostate);
break;
}
}
void
chan_obuf_empty(Channel *c)
{
debug("channel %d: obuf empty", c->self);
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:
chan_shutdown_write(c);
if (!compat20)
chan_send_oclose1(c);
chan_set_ostate(c, CHAN_OUTPUT_CLOSED);
break;
default:
error("channel %d: internal error: obuf_empty for ostate %d",
c->self, c->ostate);
break;
}
}
static void
chan_send_ieof1(Channel *c)
{
debug("channel %d: send ieof", c->self);
switch (c->istate) {
case CHAN_INPUT_OPEN:
case CHAN_INPUT_WAIT_DRAIN:
packet_start(SSH_MSG_CHANNEL_INPUT_EOF);
packet_put_int(c->remote_id);
packet_send();
break;
default:
error("channel %d: cannot send ieof for istate %d",
c->self, c->istate);
break;
}
}
static void
chan_send_oclose1(Channel *c)
{
debug("channel %d: send oclose", c->self);
switch (c->ostate) {
case CHAN_OUTPUT_OPEN:
case CHAN_OUTPUT_WAIT_DRAIN:
buffer_clear(&c->output);
packet_start(SSH_MSG_CHANNEL_OUTPUT_CLOSE);
packet_put_int(c->remote_id);
packet_send();
break;
default:
error("channel %d: cannot send oclose for ostate %d",
c->self, c->ostate);
break;
}
}
/*
* the same for SSH2
*/
static void
chan_rcvd_close2(Channel *c)
{
debug("channel %d: rcvd close", c->self);
if (c->flags & CHAN_CLOSE_RCVD)
error("channel %d: protocol error: close rcvd twice", c->self);
c->flags |= CHAN_CLOSE_RCVD;
if (c->type == SSH_CHANNEL_LARVAL) {
/* tear down larval channels immediately */
chan_set_ostate(c, CHAN_OUTPUT_CLOSED);
chan_set_istate(c, CHAN_INPUT_CLOSED);
return;
}
switch (c->ostate) {
case CHAN_OUTPUT_OPEN:
/*
* wait until a data from the channel is consumed if a CLOSE
* is received
*/
chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN);
break
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