[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("$OpenBSD: nchan.c,v 1.18 2000/06/20 01:39:42 markus Exp $");

#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;
		if (buffer_len(&c->input) == 0) {
			debug("channel %d: input: no drain shortcut", c->self);
			chan_ibuf_empty(c);
		}
		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"
74fc9186	31	RCSID("$OpenBSD: nchan.c,v 1.18 2000/06/20 01:39:42 markus Exp $");
8efc0c15	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;
d0c832f3	110	if (buffer_len(&c->input) == 0) {
	111	debug("channel %d: input: no drain shortcut", c->self);
	112	chan_ibuf_empty(c);
	113	}
8efc0c15	114	break;
8efc0c15	115	default:
7e7327a1	116	error("channel %d: internal error: we do not read, but chan_read_failed for istate %d",
7e7327a1	117	c->self, c->istate);
8efc0c15	118	break;
	119	}
	120	}
7e7327a1	121	static void
7e7327a1	122	chan_ibuf_empty1(Channel *c)
5260325f	123	{
7e7327a1	124	debug("channel %d: ibuf empty", c->self);
5260325f	125	if (buffer_len(&c->input)) {
7e7327a1	126	error("channel %d: internal error: chan_ibuf_empty for non empty buffer",
7e7327a1	127	c->self);
8efc0c15	128	return;
8efc0c15	129	}
5260325f	130	switch (c->istate) {
8efc0c15	131	case CHAN_INPUT_WAIT_DRAIN:
7e7327a1	132	debug("channel %d: input drain -> wait_oclose", c->self);
7e7327a1	133	chan_send_ieof1(c);
5260325f	134	c->istate = CHAN_INPUT_WAIT_OCLOSE;
8efc0c15	135	break;
8efc0c15	136	default:
7e7327a1	137	error("channel %d: internal error: chan_ibuf_empty for istate %d",
7e7327a1	138	c->self, c->istate);
8efc0c15	139	break;
	140	}
	141	}
7e7327a1	142	static void
7e7327a1	143	chan_rcvd_ieof1(Channel *c)
5260325f	144	{
7e7327a1	145	debug("channel %d: rcvd ieof", c->self);
1d1ffb87	146	if (c->type != SSH_CHANNEL_OPEN) {
	147	debug("channel %d: non-open", c->self);
	148	if (c->istate == CHAN_INPUT_OPEN) {
	149	debug("channel %d: non-open: input open -> wait_oclose", c->self);
	150	chan_shutdown_read(c);
	151	chan_send_ieof1(c);
	152	c->istate = CHAN_INPUT_WAIT_OCLOSE;
	153	} else {
	154	error("channel %d: istate %d != open", c->self, c->istate);
	155	}
	156	if (c->ostate == CHAN_OUTPUT_OPEN) {
	157	debug("channel %d: non-open: output open -> closed", c->self);
	158	chan_send_oclose1(c);
	159	c->ostate = CHAN_OUTPUT_CLOSED;
	160	} else {
	161	error("channel %d: ostate %d != open", c->self, c->ostate);
	162	}
	163	return;
	164	}
5260325f	165	switch (c->ostate) {
8efc0c15	166	case CHAN_OUTPUT_OPEN:
7e7327a1	167	debug("channel %d: output open -> drain", c->self);
5260325f	168	c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
8efc0c15	169	break;
8efc0c15	170	case CHAN_OUTPUT_WAIT_IEOF:
7e7327a1	171	debug("channel %d: output wait_ieof -> closed", c->self);
5260325f	172	c->ostate = CHAN_OUTPUT_CLOSED;
8efc0c15	173	break;
8efc0c15	174	default:
7e7327a1	175	error("channel %d: protocol error: chan_rcvd_ieof for ostate %d",
7e7327a1	176	c->self, c->ostate);
8efc0c15	177	break;
	178	}
	179	}
7e7327a1	180	static void
7e7327a1	181	chan_write_failed1(Channel *c)
5260325f	182	{
7e7327a1	183	debug("channel %d: write failed", c->self);
5260325f	184	switch (c->ostate) {
8efc0c15	185	case CHAN_OUTPUT_OPEN:
7e7327a1	186	debug("channel %d: output open -> wait_ieof", c->self);
7e7327a1	187	chan_send_oclose1(c);
5260325f	188	c->ostate = CHAN_OUTPUT_WAIT_IEOF;
8efc0c15	189	break;
8efc0c15	190	case CHAN_OUTPUT_WAIT_DRAIN:
7e7327a1	191	debug("channel %d: output wait_drain -> closed", c->self);
7e7327a1	192	chan_send_oclose1(c);
5260325f	193	c->ostate = CHAN_OUTPUT_CLOSED;
8efc0c15	194	break;
8efc0c15	195	default:
7e7327a1	196	error("channel %d: internal error: chan_write_failed for ostate %d",
7e7327a1	197	c->self, c->ostate);
8efc0c15	198	break;
	199	}
	200	}
7e7327a1	201	static void
7e7327a1	202	chan_obuf_empty1(Channel *c)
5260325f	203	{
7e7327a1	204	debug("channel %d: obuf empty", c->self);
5260325f	205	if (buffer_len(&c->output)) {
7e7327a1	206	error("channel %d: internal error: chan_obuf_empty for non empty buffer",
7e7327a1	207	c->self);
8efc0c15	208	return;
8efc0c15	209	}
5260325f	210	switch (c->ostate) {
8efc0c15	211	case CHAN_OUTPUT_WAIT_DRAIN:
7e7327a1	212	debug("channel %d: output drain -> closed", c->self);
7e7327a1	213	chan_send_oclose1(c);
5260325f	214	c->ostate = CHAN_OUTPUT_CLOSED;
8efc0c15	215	break;
8efc0c15	216	default:
7e7327a1	217	error("channel %d: internal error: chan_obuf_empty for ostate %d",
7e7327a1	218	c->self, c->ostate);
8efc0c15	219	break;
	220	}
	221	}
8efc0c15	222	static void
7e7327a1	223	chan_send_ieof1(Channel *c)
5260325f	224	{
7e7327a1	225	debug("channel %d: send ieof", c->self);
5260325f	226	switch (c->istate) {
8efc0c15	227	case CHAN_INPUT_OPEN:
	228	case CHAN_INPUT_WAIT_DRAIN:
	229	packet_start(SSH_MSG_CHANNEL_INPUT_EOF);
	230	packet_put_int(c->remote_id);
	231	packet_send();
	232	break;
	233	default:
7e7327a1	234	error("channel %d: internal error: cannot send ieof for istate %d",
7e7327a1	235	c->self, c->istate);
8efc0c15	236	break;
	237	}
	238	}
	239	static void
7e7327a1	240	chan_send_oclose1(Channel *c)
5260325f	241	{
7e7327a1	242	debug("channel %d: send oclose", c->self);
5260325f	243	switch (c->ostate) {
8efc0c15	244	case CHAN_OUTPUT_OPEN:
	245	case CHAN_OUTPUT_WAIT_DRAIN:
	246	chan_shutdown_write(c);
	247	buffer_consume(&c->output, buffer_len(&c->output));
	248	packet_start(SSH_MSG_CHANNEL_OUTPUT_CLOSE);
	249	packet_put_int(c->remote_id);
	250	packet_send();
	251	break;
	252	default:
7e7327a1	253	error("channel %d: internal error: cannot send oclose for ostate %d",
7e7327a1	254	c->self, c->ostate);
8efc0c15	255	break;
	256	}
	257	}
7e7327a1	258	static void
	259	chan_delete_if_full_closed1(Channel *c)
	260	{
	261	if (c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED) {
	262	debug("channel %d: full closed", c->self);
	263	channel_free(c->self);
	264	}
	265	}
5260325f	266
7e7327a1	267	/*
	268	* the same for SSH2
	269	*/
8efc0c15	270	static void
7e7327a1	271	chan_rcvd_oclose2(Channel *c)
5260325f	272	{
7e7327a1	273	debug("channel %d: rcvd close", c->self);
	274	if (c->flags & CHAN_CLOSE_RCVD)
	275	error("channel %d: protocol error: close rcvd twice", c->self);
	276	c->flags \|= CHAN_CLOSE_RCVD;
	277	if (c->type == SSH_CHANNEL_LARVAL) {
	278	/* tear down larval channels immediately */
	279	c->ostate = CHAN_OUTPUT_CLOSED;
	280	c->istate = CHAN_INPUT_CLOSED;
	281	return;
	282	}
	283	switch (c->ostate) {
	284	case CHAN_OUTPUT_OPEN:
	285	/* wait until a data from the channel is consumed if a CLOSE is received */
	286	debug("channel %d: output open -> drain", c->self);
	287	c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
	288	break;
	289	}
	290	switch (c->istate) {
	291	case CHAN_INPUT_OPEN:
	292	debug("channel %d: input open -> closed", c->self);
	293	chan_shutdown_read(c);
	294	break;
	295	case CHAN_INPUT_WAIT_DRAIN:
	296	debug("channel %d: input drain -> closed", c->self);
	297	chan_send_eof2(c);
	298	break;
	299	}
	300	c->istate = CHAN_INPUT_CLOSED;
8efc0c15	301	}
8efc0c15	302	static void
7e7327a1	303	chan_ibuf_empty2(Channel *c)
	304	{
	305	debug("channel %d: ibuf empty", c->self);
	306	if (buffer_len(&c->input)) {
	307	error("channel %d: internal error: chan_ibuf_empty for non empty buffer",
	308	c->self);
	309	return;
	310	}
	311	switch (c->istate) {
	312	case CHAN_INPUT_WAIT_DRAIN:
	313	debug("channel %d: input drain -> closed", c->self);
	314	if (!(c->flags & CHAN_CLOSE_SENT))
	315	chan_send_eof2(c);
	316	c->istate = CHAN_INPUT_CLOSED;
	317	break;
	318	default:
	319	error("channel %d: internal error: chan_ibuf_empty for istate %d",
	320	c->self, c->istate);
	321	break;
	322	}
	323	}
	324	static void
	325	chan_rcvd_ieof2(Channel *c)
5260325f	326	{
7e7327a1	327	debug("channel %d: rcvd eof", c->self);
	328	if (c->ostate == CHAN_OUTPUT_OPEN) {
	329	debug("channel %d: output open -> drain", c->self);
	330	c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
	331	}
8efc0c15	332	}
7e7327a1	333	static void
	334	chan_write_failed2(Channel *c)
	335	{
	336	debug("channel %d: write failed", c->self);
	337	switch (c->ostate) {
	338	case CHAN_OUTPUT_OPEN:
	339	debug("channel %d: output open -> closed", c->self);
1d1ffb87	340	chan_shutdown_write(c); /* ?? */
7e7327a1	341	c->ostate = CHAN_OUTPUT_CLOSED;
	342	break;
	343	case CHAN_OUTPUT_WAIT_DRAIN:
	344	debug("channel %d: output drain -> closed", c->self);
	345	chan_shutdown_write(c);
	346	c->ostate = CHAN_OUTPUT_CLOSED;
	347	break;
	348	default:
	349	error("channel %d: internal error: chan_write_failed for ostate %d",
	350	c->self, c->ostate);
	351	break;
	352	}
	353	}
	354	static void
	355	chan_obuf_empty2(Channel *c)
	356	{
	357	debug("channel %d: obuf empty", c->self);
	358	if (buffer_len(&c->output)) {
	359	error("internal error: chan_obuf_empty %d for non empty buffer",
	360	c->self);
	361	return;
	362	}
	363	switch (c->ostate) {
	364	case CHAN_OUTPUT_WAIT_DRAIN:
	365	debug("channel %d: output drain -> closed", c->self);
	366	chan_shutdown_write(c);
	367	c->ostate = CHAN_OUTPUT_CLOSED;
	368	break;
	369	default:
	370	error("channel %d: internal error: chan_obuf_empty for ostate %d",
	371	c->self, c->ostate);
	372	break;
	373	}
	374	}
	375	static void
	376	chan_send_eof2(Channel *c)
	377	{
	378	debug("channel %d: send eof", c->self);
	379	switch (c->istate) {
	380	case CHAN_INPUT_WAIT_DRAIN:
	381	packet_start(SSH2_MSG_CHANNEL_EOF);
	382	packet_put_int(c->remote_id);
	383	packet_send();
	384	break;
	385	default:
	386	error("channel %d: internal error: cannot send eof for istate %d",
	387	c->self, c->istate);
	388	break;
	389	}
	390	}
	391	static void
	392	chan_send_close2(Channel *c)
	393	{
	394	debug("channel %d: send close", c->self);
	395	if (c->ostate != CHAN_OUTPUT_CLOSED \|\|
	396	c->istate != CHAN_INPUT_CLOSED) {
	397	error("channel %d: internal error: cannot send close for istate/ostate %d/%d",
	398	c->self, c->istate, c->ostate);
	399	} else if (c->flags & CHAN_CLOSE_SENT) {
	400	error("channel %d: internal error: already sent close", c->self);
	401	} else {
	402	packet_start(SSH2_MSG_CHANNEL_CLOSE);
	403	packet_put_int(c->remote_id);
	404	packet_send();
405	c->flags \|= CHAN_CLOSE_SENT;
406	}
407	}
408	static void
409	chan_delete_if_full_closed2(Channel *c)
5260325f	410	{
5260325f	411	if (c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED) {
7e7327a1	412	if (!(c->flags & CHAN_CLOSE_SENT)) {
	413	chan_send_close2(c);
	414	}
6ae2364d	415	if ((c->flags & CHAN_CLOSE_SENT) &&
7e7327a1	416	(c->flags & CHAN_CLOSE_RCVD)) {
	417	debug("channel %d: full closed2", c->self);
	418	channel_free(c->self);
6ae2364d	419	}
8efc0c15	420	}
8efc0c15	421	}
7e7327a1	422
7e7327a1	423	/* shared */
8efc0c15	424	void
5260325f	425	chan_init_iostates(Channel *c)
	426	{
	427	c->ostate = CHAN_OUTPUT_OPEN;
	428	c->istate = CHAN_INPUT_OPEN;
7e7327a1	429	c->flags = 0;
	430	}
	431
	432	/* init */
	433	void
	434	chan_init(void)
	435	{
	436	if (compat20) {
	437	chan_rcvd_oclose = chan_rcvd_oclose2;
	438	chan_read_failed = chan_read_failed_12;
	439	chan_ibuf_empty = chan_ibuf_empty2;
	440
	441	chan_rcvd_ieof = chan_rcvd_ieof2;
	442	chan_write_failed = chan_write_failed2;
	443	chan_obuf_empty = chan_obuf_empty2;
	444
	445	chan_delete_if_full_closed = chan_delete_if_full_closed2;
	446	} else {
	447	chan_rcvd_oclose = chan_rcvd_oclose1;
	448	chan_read_failed = chan_read_failed_12;
	449	chan_ibuf_empty = chan_ibuf_empty1;
	450
	451	chan_rcvd_ieof = chan_rcvd_ieof1;
	452	chan_write_failed = chan_write_failed1;
	453	chan_obuf_empty = chan_obuf_empty1;
	454
	455	chan_delete_if_full_closed = chan_delete_if_full_closed1;
	456	}
	457	}
	458
	459	/* helper */
	460	static void
	461	chan_shutdown_write(Channel *c)
	462	{
	463	buffer_consume(&c->output, buffer_len(&c->output));
	464	if (compat20 && c->type == SSH_CHANNEL_LARVAL)
	465	return;
	466	/* shutdown failure is allowed if write failed already */
	467	debug("channel %d: close_write", c->self);
	468	if (c->sock != -1) {
	469	if (shutdown(c->sock, SHUT_WR) < 0)
	470	debug("channel %d: chan_shutdown_write: shutdown() failed for fd%d: %.100s",
	471	c->self, c->sock, strerror(errno));
	472	} else {
	473	if (close(c->wfd) < 0)
	474	log("channel %d: chan_shutdown_write: close() failed for fd%d: %.100s",
	475	c->self, c->wfd, strerror(errno));
	476	c->wfd = -1;
	477	}
	478	}
	479	static void
	480	chan_shutdown_read(Channel *c)
	481	{
	482	if (compat20 && c->type == SSH_CHANNEL_LARVAL)
	483	return;
	484	debug("channel %d: close_read", c->self);
	485	if (c->sock != -1) {
	486	if (shutdown(c->sock, SHUT_RD) < 0)
	487	error("channel %d: chan_shutdown_read: shutdown() failed for fd%d [i%d o%d]: %.100s",
	488	c->self, c->sock, c->istate, c->ostate, strerror(errno));
	489	} else {
	490	if (close(c->rfd) < 0)
	491	log("channel %d: chan_shutdown_read: close() failed for fd%d: %.100s",
	492	c->self, c->rfd, strerror(errno));
493	c->rfd = -1;
494	}
8efc0c15	495	}