[openssh.git] / nchan.c

/*
 * Copyright (c) 1999 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Markus Friedl.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * 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("$Id$");

#include "ssh.h"

#include "buffer.h"
#include "packet.h"
#include "channels.h"
#include "nchan.h"

#include "ssh2.h"
#include "compat.h"

/* functions manipulating channel states */
/*
 * EVENTS update channel input/output states execute ACTIONS
 */
/* events concerning the INPUT from socket for channel (istate) */
chan_event_fn *chan_rcvd_oclose			= NULL;
chan_event_fn *chan_read_failed			= NULL;
chan_event_fn *chan_ibuf_empty			= NULL;
/* events concerning the OUTPUT from channel for socket (ostate) */
chan_event_fn *chan_rcvd_ieof			= NULL;
chan_event_fn *chan_write_failed		= NULL;
chan_event_fn *chan_obuf_empty			= NULL;
/*
 * ACTIONS: should never update the channel states
 */
static void	chan_send_ieof1(Channel *c);
static void	chan_send_oclose1(Channel *c);
static void	chan_send_close2(Channel *c);
static void	chan_send_eof2(Channel *c);

/* channel cleanup */
chan_event_fn *chan_delete_if_full_closed	= NULL;

/* helper */
static void	chan_shutdown_write(Channel *c);
static void	chan_shutdown_read(Channel *c);

/*
 * 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:
		debug("channel %d: input wait_oclose -> closed", c->self);
		c->istate = CHAN_INPUT_CLOSED;
		break;
	case CHAN_INPUT_OPEN:
		debug("channel %d: input open -> closed", c->self);
		chan_shutdown_read(c);
		chan_send_ieof1(c);
		c->istate = CHAN_INPUT_CLOSED;
		break;
	case CHAN_INPUT_WAIT_DRAIN:
		/* both local read_failed and remote write_failed  */
		log("channel %d: input drain -> closed", c->self);
		chan_send_ieof1(c);
		c->istate = CHAN_INPUT_CLOSED;
		break;
	default:
		error("channel %d: protocol error: chan_rcvd_oclose for istate %d",
		    c->self, c->istate);
		return;
	}
}
static void
chan_read_failed_12(Channel *c)
{
	debug("channel %d: read failed", c->self);
	switch (c->istate) {
	case CHAN_INPUT_OPEN:
		debug("channel %d: input open -> drain", c->self);
		chan_shutdown_read(c);
		c->istate = CHAN_INPUT_WAIT_DRAIN;
		break;
	default:
		error("channel %d: internal error: we do not read, but chan_read_failed for istate %d",
		    c->self, c->istate);
		break;
	}
}
static void
chan_ibuf_empty1(Channel *c)
{
	debug("channel %d: ibuf empty", c->self);
	if (buffer_len(&c->input)) {
		error("channel %d: internal error: chan_ibuf_empty for non empty buffer",
		    c->self);
		return;
	}
	switch (c->istate) {
	case CHAN_INPUT_WAIT_DRAIN:
		debug("channel %d: input drain -> wait_oclose", c->self);
		chan_send_ieof1(c);
		c->istate = CHAN_INPUT_WAIT_OCLOSE;
		break;
	default:
		error("channel %d: internal error: 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);
	if (c->type != SSH_CHANNEL_OPEN) {
		debug("channel %d: non-open", c->self);
		if (c->istate == CHAN_INPUT_OPEN) {
			debug("channel %d: non-open: input open -> wait_oclose", c->self);
			chan_shutdown_read(c);
			chan_send_ieof1(c);
			c->istate = CHAN_INPUT_WAIT_OCLOSE;
		} else {
			error("channel %d: istate %d != open", c->self, c->istate);
		}
		if (c->ostate == CHAN_OUTPUT_OPEN) {
			debug("channel %d: non-open: output open -> closed", c->self);
			chan_send_oclose1(c);
			c->ostate = CHAN_OUTPUT_CLOSED;
		} else {
			error("channel %d: ostate %d != open", c->self, c->ostate);
		}
		return;
	}
	switch (c->ostate) {
	case CHAN_OUTPUT_OPEN:
		debug("channel %d: output open -> drain", c->self);
		c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
		break;
	case CHAN_OUTPUT_WAIT_IEOF:
		debug("channel %d: output wait_ieof -> closed", c->self);
		c->ostate = CHAN_OUTPUT_CLOSED;
		break;
	default:
		error("channel %d: protocol error: chan_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:
		debug("channel %d: output open -> wait_ieof", c->self);
		chan_send_oclose1(c);
		c->ostate = CHAN_OUTPUT_WAIT_IEOF;
		break;
	case CHAN_OUTPUT_WAIT_DRAIN:
		debug("channel %d: output wait_drain -> closed", c->self);
		chan_send_oclose1(c);
		c->ostate = CHAN_OUTPUT_CLOSED;
		break;
	default:
		error("channel %d: internal error: chan_write_failed for ostate %d",
		    c->self, c->ostate);
		break;
	}
}
static void
chan_obuf_empty1(Channel *c)
{
	debug("channel %d: obuf empty", c->self);
	if (buffer_len(&c->output)) {
		error("channel %d: internal error: chan_obuf_empty for non empty buffer",
		    c->self);
		return;
	}
	switch (c->ostate) {
	case CHAN_OUTPUT_WAIT_DRAIN:
		debug("channel %d: output drain -> closed", c->self);
		chan_send_oclose1(c);
		c->ostate = CHAN_OUTPUT_CLOSED;
		break;
	default:
		error("channel %d: internal error: chan_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: internal error: 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:
		chan_shutdown_write(c);
		buffer_consume(&c->output, buffer_len(&c->output));
		packet_start(SSH_MSG_CHANNEL_OUTPUT_CLOSE);
		packet_put_int(c->remote_id);
		packet_send();
		break;
	default:
		error("channel %d: internal error: cannot send oclose for ostate %d",
		     c->self, c->ostate);
		break;
	}
}
static void
chan_delete_if_full_closed1(Channel *c)
{
	if (c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED) {
		debug("channel %d: full closed", c->self);
		channel_free(c->self);
	}
}

/*
 * the same for SSH2
 */
static void
chan_rcvd_oclose2(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 */
		c->ostate = CHAN_OUTPUT_CLOSED;
		c->istate = 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 */
		debug("channel %d: output open -> drain", c->self);
		c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
		break;
	}
	switch (c->istate) {
	case CHAN_INPUT_OPEN:
		debug("channel %d: input open -> closed", c->self);
		chan_shutdown_read(c);
		break;
	case CHAN_INPUT_WAIT_DRAIN:
		debug("channel %d: input drain -> closed", c->self);
		chan_send_eof2(c);
		break;
	}
	c->istate = CHAN_INPUT_CLOSED;
}
static void
chan_ibuf_empty2(Channel *c)
{
	debug("channel %d: ibuf empty", c->self);
	if (buffer_len(&c->input)) {
		error("channel %d: internal error: chan_ibuf_empty for non empty buffer",
		     c->self);
		return;
	}
	switch (c->istate) {
	case CHAN_INPUT_WAIT_DRAIN:
		debug("channel %d: input drain -> closed", c->self);
		if (!(c->flags & CHAN_CLOSE_SENT))
			chan_send_eof2(c);
		c->istate = CHAN_INPUT_CLOSED;
		break;
	default:
		error("channel %d: internal error: chan_ibuf_empty for istate %d",
		     c->self, c->istate);
		break;
	}
}
static void
chan_rcvd_ieof2(Channel *c)
{
	debug("channel %d: rcvd eof", c->self);
	if (c->ostate == CHAN_OUTPUT_OPEN) {
		debug("channel %d: output open -> drain", c->self);
		c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
	}
}
static void
chan_write_failed2(Channel *c)
{
	debug("channel %d: write failed", c->self);
	switch (c->ostate) {
	case CHAN_OUTPUT_OPEN:
		debug("channel %d: output open -> closed", c->self);
		chan_shutdown_write(c); /* ?? */
		c->ostate = CHAN_OUTPUT_CLOSED;
		break;
	case CHAN_OUTPUT_WAIT_DRAIN:
		debug("channel %d: output drain -> closed", c->self);
		chan_shutdown_write(c);
		c->ostate = CHAN_OUTPUT_CLOSED;
		break;
	default:
		error("channel %d: internal error: chan_write_failed for ostate %d",
		    c->self, c->ostate);
		break;
	}
}
static void
chan_obuf_empty2(Channel *c)
{
	debug("channel %d: obuf empty", c->self);
	if (buffer_len(&c->output)) {
		error("internal error: chan_obuf_empty %d for non empty buffer",
		    c->self);
		return;
	}
	switch (c->ostate) {
	case CHAN_OUTPUT_WAIT_DRAIN:
		debug("channel %d: output drain -> closed", c->self);
		chan_shutdown_write(c);
		c->ostate = CHAN_OUTPUT_CLOSED;
		break;
	default:
		error("channel %d: internal error: chan_obuf_empty for ostate %d",
		    c->self, c->ostate);
		break;
	}
}
static void
chan_send_eof2(Channel *c)
{
	debug("channel %d: send eof", c->self);
	switch (c->istate) {
	case CHAN_INPUT_WAIT_DRAIN:
		packet_start(SSH2_MSG_CHANNEL_EOF);
		packet_put_int(c->remote_id);
		packet_send();
		break;
	default:
		error("channel %d: internal error: cannot send eof for istate %d",
		    c->self, c->istate);
		break;
	}
}
static void
chan_send_close2(Channel *c)
{
	debug("channel %d: send close", c->self);
	if (c->ostate != CHAN_OUTPUT_CLOSED ||
	    c->istate != CHAN_INPUT_CLOSED) {
		error("channel %d: internal error: cannot send close for istate/ostate %d/%d",
		    c->self, c->istate, c->ostate);
	} else if (c->flags & CHAN_CLOSE_SENT) {
		error("channel %d: internal error: already sent close", c->self);
	} else {
		packet_start(SSH2_MSG_CHANNEL_CLOSE);
		packet_put_int(c->remote_id);
		packet_send();
		c->flags |= CHAN_CLOSE_SENT;
	}
}
static void
chan_delete_if_full_closed2(Channel *c)
{
	if (c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED) {
		if (!(c->flags & CHAN_CLOSE_SENT)) {
			chan_send_close2(c);
		}
		if ((c->flags & CHAN_CLOSE_SENT) &&
		    (c->flags & CHAN_CLOSE_RCVD)) {
			debug("channel %d: full closed2", c->self);
			channel_free(c->self);
		}
	}
}

/* shared */
void
chan_init_iostates(Channel *c)
{
	c->ostate = CHAN_OUTPUT_OPEN;
	c->istate = CHAN_INPUT_OPEN;
	c->flags = 0;
}

/* init */
void
chan_init(void)
{
	if (compat20) {
		chan_rcvd_oclose		= chan_rcvd_oclose2;
		chan_read_failed		= chan_read_failed_12;
		chan_ibuf_empty			= chan_ibuf_empty2;

		chan_rcvd_ieof			= chan_rcvd_ieof2;
		chan_write_failed		= chan_write_failed2;
		chan_obuf_empty			= chan_obuf_empty2;

		chan_delete_if_full_closed	= chan_delete_if_full_closed2;
	} else {
		chan_rcvd_oclose		= chan_rcvd_oclose1;
		chan_read_failed		= chan_read_failed_12;
		chan_ibuf_empty			= chan_ibuf_empty1;

		chan_rcvd_ieof			= chan_rcvd_ieof1;
		chan_write_failed		= chan_write_failed1;
		chan_obuf_empty			= chan_obuf_empty1;

		chan_delete_if_full_closed	= chan_delete_if_full_closed1;
	}
}

/* helper */
static void
chan_shutdown_write(Channel *c)
{
	buffer_consume(&c->output, buffer_len(&c->output));
	if (compat20 && c->type == SSH_CHANNEL_LARVAL)
		return;
	/* shutdown failure is allowed if write failed already */
	debug("channel %d: close_write", c->self);
	if (c->sock != -1) {
		if (shutdown(c->sock, SHUT_WR) < 0)
			debug("channel %d: chan_shutdown_write: shutdown() failed for fd%d: %.100s",
			    c->self, c->sock, strerror(errno));
	} else {
		if (close(c->wfd) < 0)
			log("channel %d: chan_shutdown_write: close() failed for fd%d: %.100s",
			    c->self, c->wfd, strerror(errno));
		c->wfd = -1;
	}
}
static void
chan_shutdown_read(Channel *c)
{
	if (compat20 && c->type == SSH_CHANNEL_LARVAL)
		return;
	debug("channel %d: close_read", c->self);
	if (c->sock != -1) {
		if (shutdown(c->sock, SHUT_RD) < 0)
			error("channel %d: chan_shutdown_read: shutdown() failed for fd%d [i%d o%d]: %.100s",
			    c->self, c->sock, c->istate, c->ostate, strerror(errno));
	} else {
		if (close(c->rfd) < 0)
			log("channel %d: chan_shutdown_read: close() failed for fd%d: %.100s",
			    c->self, c->rfd, strerror(errno));
		c->rfd = -1;
	}
}
Commit	Line	Data
aa3378df	1	/*
	2	* Copyright (c) 1999 Markus Friedl. All rights reserved.
	3	*
	4	* Redistribution and use in source and binary forms, with or without
	5	* modification, are permitted provided that the following conditions
	6	* are met:
	7	* 1. Redistributions of source code must retain the above copyright
	8	* notice, this list of conditions and the following disclaimer.
	9	* 2. Redistributions in binary form must reproduce the above copyright
	10	* notice, this list of conditions and the following disclaimer in the
	11	* documentation and/or other materials provided with the distribution.
	12	* 3. All advertising materials mentioning features or use of this software
	13	* must display the following acknowledgement:
	14	* This product includes software developed by Markus Friedl.
	15	* 4. The name of the author may not be used to endorse or promote products
	16	* derived from this software without specific prior written permission.
	17	*
	18	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	19	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	20	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	21	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	22	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	23	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	24	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	25	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	26	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	27	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	28	*/
	29
8efc0c15	30	#include "includes.h"
	31	RCSID("$Id$");
	32
	33	#include "ssh.h"
	34
	35	#include "buffer.h"
	36	#include "packet.h"
	37	#include "channels.h"
	38	#include "nchan.h"
	39
7e7327a1	40	#include "ssh2.h"
7e7327a1	41	#include "compat.h"
8efc0c15	42
7e7327a1	43	/* functions manipulating channel states */
8efc0c15	44	/*
5260325f	45	* EVENTS update channel input/output states execute ACTIONS
8efc0c15	46	*/
8efc0c15	47	/* events concerning the INPUT from socket for channel (istate) */
7e7327a1	48	chan_event_fn *chan_rcvd_oclose = NULL;
	49	chan_event_fn *chan_read_failed = NULL;
	50	chan_event_fn *chan_ibuf_empty = NULL;
	51	/* events concerning the OUTPUT from channel for socket (ostate) */
	52	chan_event_fn *chan_rcvd_ieof = NULL;
	53	chan_event_fn *chan_write_failed = NULL;
	54	chan_event_fn *chan_obuf_empty = NULL;
	55	/*
	56	* ACTIONS: should never update the channel states
	57	*/
	58	static void chan_send_ieof1(Channel *c);
	59	static void chan_send_oclose1(Channel *c);
	60	static void chan_send_close2(Channel *c);
	61	static void chan_send_eof2(Channel *c);
	62
	63	/* channel cleanup */
	64	chan_event_fn *chan_delete_if_full_closed = NULL;
	65
	66	/* helper */
	67	static void chan_shutdown_write(Channel *c);
	68	static void chan_shutdown_read(Channel *c);
	69
	70	/*
	71	* SSH1 specific implementation of event functions
	72	*/
	73
	74	static void
	75	chan_rcvd_oclose1(Channel *c)
5260325f	76	{
7e7327a1	77	debug("channel %d: rcvd oclose", c->self);
5260325f	78	switch (c->istate) {
8efc0c15	79	case CHAN_INPUT_WAIT_OCLOSE:
7e7327a1	80	debug("channel %d: input wait_oclose -> closed", c->self);
5260325f	81	c->istate = CHAN_INPUT_CLOSED;
8efc0c15	82	break;
8efc0c15	83	case CHAN_INPUT_OPEN:
7e7327a1	84	debug("channel %d: input open -> closed", c->self);
8efc0c15	85	chan_shutdown_read(c);
7e7327a1	86	chan_send_ieof1(c);
5260325f	87	c->istate = CHAN_INPUT_CLOSED;
48e671d5	88	break;
	89	case CHAN_INPUT_WAIT_DRAIN:
	90	/* both local read_failed and remote write_failed */
7e7327a1	91	log("channel %d: input drain -> closed", c->self);
7e7327a1	92	chan_send_ieof1(c);
48e671d5	93	c->istate = CHAN_INPUT_CLOSED;
8efc0c15	94	break;
8efc0c15	95	default:
7e7327a1	96	error("channel %d: protocol error: chan_rcvd_oclose for istate %d",
7e7327a1	97	c->self, c->istate);
48e671d5	98	return;
8efc0c15	99	}
8efc0c15	100	}
7e7327a1	101	static void
7e7327a1	102	chan_read_failed_12(Channel *c)
5260325f	103	{
7e7327a1	104	debug("channel %d: read failed", c->self);
5260325f	105	switch (c->istate) {
8efc0c15	106	case CHAN_INPUT_OPEN:
7e7327a1	107	debug("channel %d: input open -> drain", c->self);
8efc0c15	108	chan_shutdown_read(c);
5260325f	109	c->istate = CHAN_INPUT_WAIT_DRAIN;
8efc0c15	110	break;
8efc0c15	111	default:
7e7327a1	112	error("channel %d: internal error: we do not read, but chan_read_failed for istate %d",
7e7327a1	113	c->self, c->istate);
8efc0c15	114	break;
	115	}
	116	}
7e7327a1	117	static void
7e7327a1	118	chan_ibuf_empty1(Channel *c)
5260325f	119	{
7e7327a1	120	debug("channel %d: ibuf empty", c->self);
5260325f	121	if (buffer_len(&c->input)) {
7e7327a1	122	error("channel %d: internal error: chan_ibuf_empty for non empty buffer",
7e7327a1	123	c->self);
8efc0c15	124	return;
8efc0c15	125	}
5260325f	126	switch (c->istate) {
8efc0c15	127	case CHAN_INPUT_WAIT_DRAIN:
7e7327a1	128	debug("channel %d: input drain -> wait_oclose", c->self);
7e7327a1	129	chan_send_ieof1(c);
5260325f	130	c->istate = CHAN_INPUT_WAIT_OCLOSE;
8efc0c15	131	break;
8efc0c15	132	default:
7e7327a1	133	error("channel %d: internal error: chan_ibuf_empty for istate %d",
7e7327a1	134	c->self, c->istate);
8efc0c15	135	break;
	136	}
	137	}
7e7327a1	138	static void
7e7327a1	139	chan_rcvd_ieof1(Channel *c)
5260325f	140	{
7e7327a1	141	debug("channel %d: rcvd ieof", c->self);
1d1ffb87	142	if (c->type != SSH_CHANNEL_OPEN) {
	143	debug("channel %d: non-open", c->self);
	144	if (c->istate == CHAN_INPUT_OPEN) {
	145	debug("channel %d: non-open: input open -> wait_oclose", c->self);
	146	chan_shutdown_read(c);
	147	chan_send_ieof1(c);
	148	c->istate = CHAN_INPUT_WAIT_OCLOSE;
	149	} else {
	150	error("channel %d: istate %d != open", c->self, c->istate);
	151	}
	152	if (c->ostate == CHAN_OUTPUT_OPEN) {
	153	debug("channel %d: non-open: output open -> closed", c->self);
	154	chan_send_oclose1(c);
	155	c->ostate = CHAN_OUTPUT_CLOSED;
	156	} else {
	157	error("channel %d: ostate %d != open", c->self, c->ostate);
	158	}
	159	return;
	160	}
5260325f	161	switch (c->ostate) {
8efc0c15	162	case CHAN_OUTPUT_OPEN:
7e7327a1	163	debug("channel %d: output open -> drain", c->self);
5260325f	164	c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
8efc0c15	165	break;
8efc0c15	166	case CHAN_OUTPUT_WAIT_IEOF:
7e7327a1	167	debug("channel %d: output wait_ieof -> closed", c->self);
5260325f	168	c->ostate = CHAN_OUTPUT_CLOSED;
8efc0c15	169	break;
8efc0c15	170	default:
7e7327a1	171	error("channel %d: protocol error: chan_rcvd_ieof for ostate %d",
7e7327a1	172	c->self, c->ostate);
8efc0c15	173	break;
	174	}
	175	}
7e7327a1	176	static void
7e7327a1	177	chan_write_failed1(Channel *c)
5260325f	178	{
7e7327a1	179	debug("channel %d: write failed", c->self);
5260325f	180	switch (c->ostate) {
8efc0c15	181	case CHAN_OUTPUT_OPEN:
7e7327a1	182	debug("channel %d: output open -> wait_ieof", c->self);
7e7327a1	183	chan_send_oclose1(c);
5260325f	184	c->ostate = CHAN_OUTPUT_WAIT_IEOF;
8efc0c15	185	break;
8efc0c15	186	case CHAN_OUTPUT_WAIT_DRAIN:
7e7327a1	187	debug("channel %d: output wait_drain -> closed", c->self);
7e7327a1	188	chan_send_oclose1(c);
5260325f	189	c->ostate = CHAN_OUTPUT_CLOSED;
8efc0c15	190	break;
8efc0c15	191	default:
7e7327a1	192	error("channel %d: internal error: chan_write_failed for ostate %d",
7e7327a1	193	c->self, c->ostate);
8efc0c15	194	break;
	195	}
	196	}
7e7327a1	197	static void
7e7327a1	198	chan_obuf_empty1(Channel *c)
5260325f	199	{
7e7327a1	200	debug("channel %d: obuf empty", c->self);
5260325f	201	if (buffer_len(&c->output)) {
7e7327a1	202	error("channel %d: internal error: chan_obuf_empty for non empty buffer",
7e7327a1	203	c->self);
8efc0c15	204	return;
8efc0c15	205	}
5260325f	206	switch (c->ostate) {
8efc0c15	207	case CHAN_OUTPUT_WAIT_DRAIN:
7e7327a1	208	debug("channel %d: output drain -> closed", c->self);
7e7327a1	209	chan_send_oclose1(c);
5260325f	210	c->ostate = CHAN_OUTPUT_CLOSED;
8efc0c15	211	break;
8efc0c15	212	default:
7e7327a1	213	error("channel %d: internal error: chan_obuf_empty for ostate %d",
7e7327a1	214	c->self, c->ostate);
8efc0c15	215	break;
	216	}
	217	}
8efc0c15	218	static void
7e7327a1	219	chan_send_ieof1(Channel *c)
5260325f	220	{
7e7327a1	221	debug("channel %d: send ieof", c->self);
5260325f	222	switch (c->istate) {
8efc0c15	223	case CHAN_INPUT_OPEN:
	224	case CHAN_INPUT_WAIT_DRAIN:
	225	packet_start(SSH_MSG_CHANNEL_INPUT_EOF);
	226	packet_put_int(c->remote_id);
	227	packet_send();
	228	break;
	229	default:
7e7327a1	230	error("channel %d: internal error: cannot send ieof for istate %d",
7e7327a1	231	c->self, c->istate);
8efc0c15	232	break;
	233	}
	234	}
	235	static void
7e7327a1	236	chan_send_oclose1(Channel *c)
5260325f	237	{
7e7327a1	238	debug("channel %d: send oclose", c->self);
5260325f	239	switch (c->ostate) {
8efc0c15	240	case CHAN_OUTPUT_OPEN:
	241	case CHAN_OUTPUT_WAIT_DRAIN:
	242	chan_shutdown_write(c);
	243	buffer_consume(&c->output, buffer_len(&c->output));
	244	packet_start(SSH_MSG_CHANNEL_OUTPUT_CLOSE);
	245	packet_put_int(c->remote_id);
	246	packet_send();
	247	break;
	248	default:
7e7327a1	249	error("channel %d: internal error: cannot send oclose for ostate %d",
7e7327a1	250	c->self, c->ostate);
8efc0c15	251	break;
	252	}
	253	}
7e7327a1	254	static void
	255	chan_delete_if_full_closed1(Channel *c)
	256	{
	257	if (c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED) {
	258	debug("channel %d: full closed", c->self);
	259	channel_free(c->self);
	260	}
	261	}
5260325f	262
7e7327a1	263	/*
	264	* the same for SSH2
	265	*/
8efc0c15	266	static void
7e7327a1	267	chan_rcvd_oclose2(Channel *c)
5260325f	268	{
7e7327a1	269	debug("channel %d: rcvd close", c->self);
	270	if (c->flags & CHAN_CLOSE_RCVD)
	271	error("channel %d: protocol error: close rcvd twice", c->self);
	272	c->flags \|= CHAN_CLOSE_RCVD;
	273	if (c->type == SSH_CHANNEL_LARVAL) {
	274	/* tear down larval channels immediately */
	275	c->ostate = CHAN_OUTPUT_CLOSED;
	276	c->istate = CHAN_INPUT_CLOSED;
	277	return;
	278	}
	279	switch (c->ostate) {
	280	case CHAN_OUTPUT_OPEN:
	281	/* wait until a data from the channel is consumed if a CLOSE is received */
	282	debug("channel %d: output open -> drain", c->self);
	283	c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
	284	break;
	285	}
	286	switch (c->istate) {
	287	case CHAN_INPUT_OPEN:
	288	debug("channel %d: input open -> closed", c->self);
	289	chan_shutdown_read(c);
	290	break;
	291	case CHAN_INPUT_WAIT_DRAIN:
	292	debug("channel %d: input drain -> closed", c->self);
	293	chan_send_eof2(c);
	294	break;
	295	}
	296	c->istate = CHAN_INPUT_CLOSED;
8efc0c15	297	}
8efc0c15	298	static void
7e7327a1	299	chan_ibuf_empty2(Channel *c)
	300	{
	301	debug("channel %d: ibuf empty", c->self);
	302	if (buffer_len(&c->input)) {
	303	error("channel %d: internal error: chan_ibuf_empty for non empty buffer",
	304	c->self);
	305	return;
	306	}
	307	switch (c->istate) {
	308	case CHAN_INPUT_WAIT_DRAIN:
	309	debug("channel %d: input drain -> closed", c->self);
	310	if (!(c->flags & CHAN_CLOSE_SENT))
	311	chan_send_eof2(c);
	312	c->istate = CHAN_INPUT_CLOSED;
	313	break;
	314	default:
	315	error("channel %d: internal error: chan_ibuf_empty for istate %d",
	316	c->self, c->istate);
	317	break;
	318	}
	319	}
	320	static void
	321	chan_rcvd_ieof2(Channel *c)
5260325f	322	{
7e7327a1	323	debug("channel %d: rcvd eof", c->self);
	324	if (c->ostate == CHAN_OUTPUT_OPEN) {
	325	debug("channel %d: output open -> drain", c->self);
	326	c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
	327	}
8efc0c15	328	}
7e7327a1	329	static void
	330	chan_write_failed2(Channel *c)
	331	{
	332	debug("channel %d: write failed", c->self);
	333	switch (c->ostate) {
	334	case CHAN_OUTPUT_OPEN:
	335	debug("channel %d: output open -> closed", c->self);
1d1ffb87	336	chan_shutdown_write(c); /* ?? */
7e7327a1	337	c->ostate = CHAN_OUTPUT_CLOSED;
	338	break;
	339	case CHAN_OUTPUT_WAIT_DRAIN:
	340	debug("channel %d: output drain -> closed", c->self);
	341	chan_shutdown_write(c);
	342	c->ostate = CHAN_OUTPUT_CLOSED;
	343	break;
	344	default:
	345	error("channel %d: internal error: chan_write_failed for ostate %d",
	346	c->self, c->ostate);
	347	break;
	348	}
	349	}
	350	static void
	351	chan_obuf_empty2(Channel *c)
	352	{
	353	debug("channel %d: obuf empty", c->self);
	354	if (buffer_len(&c->output)) {
	355	error("internal error: chan_obuf_empty %d for non empty buffer",
	356	c->self);
	357	return;
	358	}
	359	switch (c->ostate) {
	360	case CHAN_OUTPUT_WAIT_DRAIN:
	361	debug("channel %d: output drain -> closed", c->self);
	362	chan_shutdown_write(c);
	363	c->ostate = CHAN_OUTPUT_CLOSED;
	364	break;
	365	default:
	366	error("channel %d: internal error: chan_obuf_empty for ostate %d",
	367	c->self, c->ostate);
	368	break;
	369	}
	370	}
	371	static void
	372	chan_send_eof2(Channel *c)
	373	{
	374	debug("channel %d: send eof", c->self);
	375	switch (c->istate) {
	376	case CHAN_INPUT_WAIT_DRAIN:
	377	packet_start(SSH2_MSG_CHANNEL_EOF);
	378	packet_put_int(c->remote_id);
	379	packet_send();
	380	break;
	381	default:
	382	error("channel %d: internal error: cannot send eof for istate %d",
	383	c->self, c->istate);
	384	break;
	385	}
	386	}
	387	static void
	388	chan_send_close2(Channel *c)
	389	{
	390	debug("channel %d: send close", c->self);
	391	if (c->ostate != CHAN_OUTPUT_CLOSED \|\|
	392	c->istate != CHAN_INPUT_CLOSED) {
	393	error("channel %d: internal error: cannot send close for istate/ostate %d/%d",
	394	c->self, c->istate, c->ostate);
	395	} else if (c->flags & CHAN_CLOSE_SENT) {
	396	error("channel %d: internal error: already sent close", c->self);
	397	} else {
	398	packet_start(SSH2_MSG_CHANNEL_CLOSE);
	399	packet_put_int(c->remote_id);
	400	packet_send();
401	c->flags \|= CHAN_CLOSE_SENT;
402	}
403	}
404	static void
405	chan_delete_if_full_closed2(Channel *c)
5260325f	406	{
5260325f	407	if (c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED) {
7e7327a1	408	if (!(c->flags & CHAN_CLOSE_SENT)) {
	409	chan_send_close2(c);
	410	}
6ae2364d	411	if ((c->flags & CHAN_CLOSE_SENT) &&
7e7327a1	412	(c->flags & CHAN_CLOSE_RCVD)) {
	413	debug("channel %d: full closed2", c->self);
	414	channel_free(c->self);
6ae2364d	415	}
8efc0c15	416	}
8efc0c15	417	}
7e7327a1	418
7e7327a1	419	/* shared */
8efc0c15	420	void
5260325f	421	chan_init_iostates(Channel *c)
	422	{
	423	c->ostate = CHAN_OUTPUT_OPEN;
	424	c->istate = CHAN_INPUT_OPEN;
7e7327a1	425	c->flags = 0;
	426	}
	427
	428	/* init */
	429	void
	430	chan_init(void)
	431	{
	432	if (compat20) {
	433	chan_rcvd_oclose = chan_rcvd_oclose2;
	434	chan_read_failed = chan_read_failed_12;
	435	chan_ibuf_empty = chan_ibuf_empty2;
	436
	437	chan_rcvd_ieof = chan_rcvd_ieof2;
	438	chan_write_failed = chan_write_failed2;
	439	chan_obuf_empty = chan_obuf_empty2;
	440
	441	chan_delete_if_full_closed = chan_delete_if_full_closed2;
	442	} else {
	443	chan_rcvd_oclose = chan_rcvd_oclose1;
	444	chan_read_failed = chan_read_failed_12;
	445	chan_ibuf_empty = chan_ibuf_empty1;
	446
	447	chan_rcvd_ieof = chan_rcvd_ieof1;
	448	chan_write_failed = chan_write_failed1;
	449	chan_obuf_empty = chan_obuf_empty1;
	450
	451	chan_delete_if_full_closed = chan_delete_if_full_closed1;
	452	}
	453	}
	454
	455	/* helper */
	456	static void
	457	chan_shutdown_write(Channel *c)
	458	{
	459	buffer_consume(&c->output, buffer_len(&c->output));
	460	if (compat20 && c->type == SSH_CHANNEL_LARVAL)
	461	return;
	462	/* shutdown failure is allowed if write failed already */
	463	debug("channel %d: close_write", c->self);
	464	if (c->sock != -1) {
	465	if (shutdown(c->sock, SHUT_WR) < 0)
	466	debug("channel %d: chan_shutdown_write: shutdown() failed for fd%d: %.100s",
	467	c->self, c->sock, strerror(errno));
	468	} else {
	469	if (close(c->wfd) < 0)
	470	log("channel %d: chan_shutdown_write: close() failed for fd%d: %.100s",
	471	c->self, c->wfd, strerror(errno));
	472	c->wfd = -1;
	473	}
	474	}
	475	static void
	476	chan_shutdown_read(Channel *c)
	477	{
	478	if (compat20 && c->type == SSH_CHANNEL_LARVAL)
	479	return;
	480	debug("channel %d: close_read", c->self);
	481	if (c->sock != -1) {
	482	if (shutdown(c->sock, SHUT_RD) < 0)
	483	error("channel %d: chan_shutdown_read: shutdown() failed for fd%d [i%d o%d]: %.100s",
	484	c->self, c->sock, c->istate, c->ostate, strerror(errno));
	485	} else {
	486	if (close(c->rfd) < 0)
	487	log("channel %d: chan_shutdown_read: close() failed for fd%d: %.100s",
	488	c->self, c->rfd, strerror(errno));
489	c->rfd = -1;
490	}
8efc0c15	491	}