[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.
 *
 * 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 1.19 2000/09/07 20:27:52 deraadt 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) {
		/* 
		 * shutdown(sock, SHUT_READ) may return ENOTCONN if the
		 * write side has been closed already. (bug on Linux)
		 */
		if (shutdown(c->sock, SHUT_RD) < 0
		    && (errno != ENOTCONN
			|| c->ostate == CHAN_OUTPUT_OPEN
			|| c->ostate == CHAN_OUTPUT_WAIT_DRAIN))
			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.
aa3378df	12	*
	13	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	14	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	15	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	16	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	17	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	18	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	19	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	20	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	21	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	22	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	23	*/
	24
8efc0c15	25	#include "includes.h"
bcbf86ec	26	RCSID("$OpenBSD: nchan.c,v 1.19 2000/09/07 20:27:52 deraadt Exp $");
8efc0c15	27
	28	#include "ssh.h"
	29
	30	#include "buffer.h"
	31	#include "packet.h"
	32	#include "channels.h"
	33	#include "nchan.h"
	34
7e7327a1	35	#include "ssh2.h"
7e7327a1	36	#include "compat.h"
8efc0c15	37
7e7327a1	38	/* functions manipulating channel states */
8efc0c15	39	/*
5260325f	40	* EVENTS update channel input/output states execute ACTIONS
8efc0c15	41	*/
8efc0c15	42	/* events concerning the INPUT from socket for channel (istate) */
7e7327a1	43	chan_event_fn *chan_rcvd_oclose = NULL;
	44	chan_event_fn *chan_read_failed = NULL;
	45	chan_event_fn *chan_ibuf_empty = NULL;
	46	/* events concerning the OUTPUT from channel for socket (ostate) */
	47	chan_event_fn *chan_rcvd_ieof = NULL;
	48	chan_event_fn *chan_write_failed = NULL;
	49	chan_event_fn *chan_obuf_empty = NULL;
	50	/*
	51	* ACTIONS: should never update the channel states
	52	*/
	53	static void chan_send_ieof1(Channel *c);
	54	static void chan_send_oclose1(Channel *c);
	55	static void chan_send_close2(Channel *c);
	56	static void chan_send_eof2(Channel *c);
	57
	58	/* channel cleanup */
	59	chan_event_fn *chan_delete_if_full_closed = NULL;
	60
	61	/* helper */
	62	static void chan_shutdown_write(Channel *c);
	63	static void chan_shutdown_read(Channel *c);
	64
	65	/*
	66	* SSH1 specific implementation of event functions
	67	*/
	68
	69	static void
	70	chan_rcvd_oclose1(Channel *c)
5260325f	71	{
7e7327a1	72	debug("channel %d: rcvd oclose", c->self);
5260325f	73	switch (c->istate) {
8efc0c15	74	case CHAN_INPUT_WAIT_OCLOSE:
7e7327a1	75	debug("channel %d: input wait_oclose -> closed", c->self);
5260325f	76	c->istate = CHAN_INPUT_CLOSED;
8efc0c15	77	break;
8efc0c15	78	case CHAN_INPUT_OPEN:
7e7327a1	79	debug("channel %d: input open -> closed", c->self);
8efc0c15	80	chan_shutdown_read(c);
7e7327a1	81	chan_send_ieof1(c);
5260325f	82	c->istate = CHAN_INPUT_CLOSED;
48e671d5	83	break;
	84	case CHAN_INPUT_WAIT_DRAIN:
	85	/* both local read_failed and remote write_failed */
7e7327a1	86	log("channel %d: input drain -> closed", c->self);
7e7327a1	87	chan_send_ieof1(c);
48e671d5	88	c->istate = CHAN_INPUT_CLOSED;
8efc0c15	89	break;
8efc0c15	90	default:
7e7327a1	91	error("channel %d: protocol error: chan_rcvd_oclose for istate %d",
7e7327a1	92	c->self, c->istate);
48e671d5	93	return;
8efc0c15	94	}
8efc0c15	95	}
7e7327a1	96	static void
7e7327a1	97	chan_read_failed_12(Channel *c)
5260325f	98	{
7e7327a1	99	debug("channel %d: read failed", c->self);
5260325f	100	switch (c->istate) {
8efc0c15	101	case CHAN_INPUT_OPEN:
7e7327a1	102	debug("channel %d: input open -> drain", c->self);
8efc0c15	103	chan_shutdown_read(c);
5260325f	104	c->istate = CHAN_INPUT_WAIT_DRAIN;
d0c832f3	105	if (buffer_len(&c->input) == 0) {
	106	debug("channel %d: input: no drain shortcut", c->self);
	107	chan_ibuf_empty(c);
	108	}
8efc0c15	109	break;
8efc0c15	110	default:
7e7327a1	111	error("channel %d: internal error: we do not read, but chan_read_failed for istate %d",
7e7327a1	112	c->self, c->istate);
8efc0c15	113	break;
	114	}
	115	}
7e7327a1	116	static void
7e7327a1	117	chan_ibuf_empty1(Channel *c)
5260325f	118	{
7e7327a1	119	debug("channel %d: ibuf empty", c->self);
5260325f	120	if (buffer_len(&c->input)) {
7e7327a1	121	error("channel %d: internal error: chan_ibuf_empty for non empty buffer",
7e7327a1	122	c->self);
8efc0c15	123	return;
8efc0c15	124	}
5260325f	125	switch (c->istate) {
8efc0c15	126	case CHAN_INPUT_WAIT_DRAIN:
7e7327a1	127	debug("channel %d: input drain -> wait_oclose", c->self);
7e7327a1	128	chan_send_ieof1(c);
5260325f	129	c->istate = CHAN_INPUT_WAIT_OCLOSE;
8efc0c15	130	break;
8efc0c15	131	default:
7e7327a1	132	error("channel %d: internal error: chan_ibuf_empty for istate %d",
7e7327a1	133	c->self, c->istate);
8efc0c15	134	break;
	135	}
	136	}
7e7327a1	137	static void
7e7327a1	138	chan_rcvd_ieof1(Channel *c)
5260325f	139	{
7e7327a1	140	debug("channel %d: rcvd ieof", c->self);
1d1ffb87	141	if (c->type != SSH_CHANNEL_OPEN) {
	142	debug("channel %d: non-open", c->self);
	143	if (c->istate == CHAN_INPUT_OPEN) {
	144	debug("channel %d: non-open: input open -> wait_oclose", c->self);
	145	chan_shutdown_read(c);
	146	chan_send_ieof1(c);
	147	c->istate = CHAN_INPUT_WAIT_OCLOSE;
	148	} else {
	149	error("channel %d: istate %d != open", c->self, c->istate);
	150	}
	151	if (c->ostate == CHAN_OUTPUT_OPEN) {
	152	debug("channel %d: non-open: output open -> closed", c->self);
	153	chan_send_oclose1(c);
	154	c->ostate = CHAN_OUTPUT_CLOSED;
	155	} else {
	156	error("channel %d: ostate %d != open", c->self, c->ostate);
	157	}
	158	return;
	159	}
5260325f	160	switch (c->ostate) {
8efc0c15	161	case CHAN_OUTPUT_OPEN:
7e7327a1	162	debug("channel %d: output open -> drain", c->self);
5260325f	163	c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
8efc0c15	164	break;
8efc0c15	165	case CHAN_OUTPUT_WAIT_IEOF:
7e7327a1	166	debug("channel %d: output wait_ieof -> closed", c->self);
5260325f	167	c->ostate = CHAN_OUTPUT_CLOSED;
8efc0c15	168	break;
8efc0c15	169	default:
7e7327a1	170	error("channel %d: protocol error: chan_rcvd_ieof for ostate %d",
7e7327a1	171	c->self, c->ostate);
8efc0c15	172	break;
	173	}
	174	}
7e7327a1	175	static void
7e7327a1	176	chan_write_failed1(Channel *c)
5260325f	177	{
7e7327a1	178	debug("channel %d: write failed", c->self);
5260325f	179	switch (c->ostate) {
8efc0c15	180	case CHAN_OUTPUT_OPEN:
7e7327a1	181	debug("channel %d: output open -> wait_ieof", c->self);
7e7327a1	182	chan_send_oclose1(c);
5260325f	183	c->ostate = CHAN_OUTPUT_WAIT_IEOF;
8efc0c15	184	break;
8efc0c15	185	case CHAN_OUTPUT_WAIT_DRAIN:
7e7327a1	186	debug("channel %d: output wait_drain -> closed", c->self);
7e7327a1	187	chan_send_oclose1(c);
5260325f	188	c->ostate = CHAN_OUTPUT_CLOSED;
8efc0c15	189	break;
8efc0c15	190	default:
7e7327a1	191	error("channel %d: internal error: chan_write_failed for ostate %d",
7e7327a1	192	c->self, c->ostate);
8efc0c15	193	break;
	194	}
	195	}
7e7327a1	196	static void
7e7327a1	197	chan_obuf_empty1(Channel *c)
5260325f	198	{
7e7327a1	199	debug("channel %d: obuf empty", c->self);
5260325f	200	if (buffer_len(&c->output)) {
7e7327a1	201	error("channel %d: internal error: chan_obuf_empty for non empty buffer",
7e7327a1	202	c->self);
8efc0c15	203	return;
8efc0c15	204	}
5260325f	205	switch (c->ostate) {
8efc0c15	206	case CHAN_OUTPUT_WAIT_DRAIN:
7e7327a1	207	debug("channel %d: output drain -> closed", c->self);
7e7327a1	208	chan_send_oclose1(c);
5260325f	209	c->ostate = CHAN_OUTPUT_CLOSED;
8efc0c15	210	break;
8efc0c15	211	default:
7e7327a1	212	error("channel %d: internal error: chan_obuf_empty for ostate %d",
7e7327a1	213	c->self, c->ostate);
8efc0c15	214	break;
	215	}
	216	}
8efc0c15	217	static void
7e7327a1	218	chan_send_ieof1(Channel *c)
5260325f	219	{
7e7327a1	220	debug("channel %d: send ieof", c->self);
5260325f	221	switch (c->istate) {
8efc0c15	222	case CHAN_INPUT_OPEN:
	223	case CHAN_INPUT_WAIT_DRAIN:
	224	packet_start(SSH_MSG_CHANNEL_INPUT_EOF);
	225	packet_put_int(c->remote_id);
	226	packet_send();
	227	break;
	228	default:
7e7327a1	229	error("channel %d: internal error: cannot send ieof for istate %d",
7e7327a1	230	c->self, c->istate);
8efc0c15	231	break;
	232	}
	233	}
	234	static void
7e7327a1	235	chan_send_oclose1(Channel *c)
5260325f	236	{
7e7327a1	237	debug("channel %d: send oclose", c->self);
5260325f	238	switch (c->ostate) {
8efc0c15	239	case CHAN_OUTPUT_OPEN:
	240	case CHAN_OUTPUT_WAIT_DRAIN:
	241	chan_shutdown_write(c);
	242	buffer_consume(&c->output, buffer_len(&c->output));
	243	packet_start(SSH_MSG_CHANNEL_OUTPUT_CLOSE);
	244	packet_put_int(c->remote_id);
	245	packet_send();
	246	break;
	247	default:
7e7327a1	248	error("channel %d: internal error: cannot send oclose for ostate %d",
7e7327a1	249	c->self, c->ostate);
8efc0c15	250	break;
	251	}
	252	}
7e7327a1	253	static void
	254	chan_delete_if_full_closed1(Channel *c)
	255	{
	256	if (c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED) {
	257	debug("channel %d: full closed", c->self);
	258	channel_free(c->self);
	259	}
	260	}
5260325f	261
7e7327a1	262	/*
	263	* the same for SSH2
	264	*/
8efc0c15	265	static void
7e7327a1	266	chan_rcvd_oclose2(Channel *c)
5260325f	267	{
7e7327a1	268	debug("channel %d: rcvd close", c->self);
	269	if (c->flags & CHAN_CLOSE_RCVD)
	270	error("channel %d: protocol error: close rcvd twice", c->self);
	271	c->flags \|= CHAN_CLOSE_RCVD;
	272	if (c->type == SSH_CHANNEL_LARVAL) {
	273	/* tear down larval channels immediately */
	274	c->ostate = CHAN_OUTPUT_CLOSED;
	275	c->istate = CHAN_INPUT_CLOSED;
	276	return;
	277	}
	278	switch (c->ostate) {
	279	case CHAN_OUTPUT_OPEN:
	280	/* wait until a data from the channel is consumed if a CLOSE is received */
	281	debug("channel %d: output open -> drain", c->self);
	282	c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
	283	break;
	284	}
	285	switch (c->istate) {
	286	case CHAN_INPUT_OPEN:
	287	debug("channel %d: input open -> closed", c->self);
	288	chan_shutdown_read(c);
	289	break;
	290	case CHAN_INPUT_WAIT_DRAIN:
	291	debug("channel %d: input drain -> closed", c->self);
	292	chan_send_eof2(c);
	293	break;
	294	}
	295	c->istate = CHAN_INPUT_CLOSED;
8efc0c15	296	}
8efc0c15	297	static void
7e7327a1	298	chan_ibuf_empty2(Channel *c)
	299	{
	300	debug("channel %d: ibuf empty", c->self);
	301	if (buffer_len(&c->input)) {
	302	error("channel %d: internal error: chan_ibuf_empty for non empty buffer",
	303	c->self);
	304	return;
	305	}
	306	switch (c->istate) {
	307	case CHAN_INPUT_WAIT_DRAIN:
	308	debug("channel %d: input drain -> closed", c->self);
	309	if (!(c->flags & CHAN_CLOSE_SENT))
	310	chan_send_eof2(c);
	311	c->istate = CHAN_INPUT_CLOSED;
	312	break;
	313	default:
	314	error("channel %d: internal error: chan_ibuf_empty for istate %d",
	315	c->self, c->istate);
	316	break;
	317	}
	318	}
	319	static void
	320	chan_rcvd_ieof2(Channel *c)
5260325f	321	{
7e7327a1	322	debug("channel %d: rcvd eof", c->self);
	323	if (c->ostate == CHAN_OUTPUT_OPEN) {
	324	debug("channel %d: output open -> drain", c->self);
	325	c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
	326	}
8efc0c15	327	}
7e7327a1	328	static void
	329	chan_write_failed2(Channel *c)
	330	{
	331	debug("channel %d: write failed", c->self);
	332	switch (c->ostate) {
	333	case CHAN_OUTPUT_OPEN:
	334	debug("channel %d: output open -> closed", c->self);
1d1ffb87	335	chan_shutdown_write(c); /* ?? */
7e7327a1	336	c->ostate = CHAN_OUTPUT_CLOSED;
	337	break;
	338	case CHAN_OUTPUT_WAIT_DRAIN:
	339	debug("channel %d: output drain -> closed", c->self);
	340	chan_shutdown_write(c);
	341	c->ostate = CHAN_OUTPUT_CLOSED;
	342	break;
	343	default:
	344	error("channel %d: internal error: chan_write_failed for ostate %d",
	345	c->self, c->ostate);
	346	break;
	347	}
	348	}
	349	static void
	350	chan_obuf_empty2(Channel *c)
	351	{
	352	debug("channel %d: obuf empty", c->self);
	353	if (buffer_len(&c->output)) {
	354	error("internal error: chan_obuf_empty %d for non empty buffer",
	355	c->self);
	356	return;
	357	}
	358	switch (c->ostate) {
	359	case CHAN_OUTPUT_WAIT_DRAIN:
	360	debug("channel %d: output drain -> closed", c->self);
	361	chan_shutdown_write(c);
	362	c->ostate = CHAN_OUTPUT_CLOSED;
	363	break;
	364	default:
	365	error("channel %d: internal error: chan_obuf_empty for ostate %d",
	366	c->self, c->ostate);
	367	break;
	368	}
	369	}
	370	static void
	371	chan_send_eof2(Channel *c)
	372	{
	373	debug("channel %d: send eof", c->self);
	374	switch (c->istate) {
	375	case CHAN_INPUT_WAIT_DRAIN:
	376	packet_start(SSH2_MSG_CHANNEL_EOF);
	377	packet_put_int(c->remote_id);
	378	packet_send();
	379	break;
	380	default:
	381	error("channel %d: internal error: cannot send eof for istate %d",
	382	c->self, c->istate);
	383	break;
	384	}
	385	}
	386	static void
	387	chan_send_close2(Channel *c)
	388	{
	389	debug("channel %d: send close", c->self);
	390	if (c->ostate != CHAN_OUTPUT_CLOSED \|\|
	391	c->istate != CHAN_INPUT_CLOSED) {
	392	error("channel %d: internal error: cannot send close for istate/ostate %d/%d",
	393	c->self, c->istate, c->ostate);
	394	} else if (c->flags & CHAN_CLOSE_SENT) {
	395	error("channel %d: internal error: already sent close", c->self);
	396	} else {
	397	packet_start(SSH2_MSG_CHANNEL_CLOSE);
	398	packet_put_int(c->remote_id);
	399	packet_send();
400	c->flags \|= CHAN_CLOSE_SENT;
401	}
402	}
403	static void
404	chan_delete_if_full_closed2(Channel *c)
5260325f	405	{
5260325f	406	if (c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED) {
7e7327a1	407	if (!(c->flags & CHAN_CLOSE_SENT)) {
	408	chan_send_close2(c);
	409	}
6ae2364d	410	if ((c->flags & CHAN_CLOSE_SENT) &&
7e7327a1	411	(c->flags & CHAN_CLOSE_RCVD)) {
	412	debug("channel %d: full closed2", c->self);
	413	channel_free(c->self);
6ae2364d	414	}
8efc0c15	415	}
8efc0c15	416	}
7e7327a1	417
7e7327a1	418	/* shared */
8efc0c15	419	void
5260325f	420	chan_init_iostates(Channel *c)
	421	{
	422	c->ostate = CHAN_OUTPUT_OPEN;
	423	c->istate = CHAN_INPUT_OPEN;
7e7327a1	424	c->flags = 0;
	425	}
	426
	427	/* init */
	428	void
	429	chan_init(void)
	430	{
	431	if (compat20) {
	432	chan_rcvd_oclose = chan_rcvd_oclose2;
	433	chan_read_failed = chan_read_failed_12;
	434	chan_ibuf_empty = chan_ibuf_empty2;
	435
	436	chan_rcvd_ieof = chan_rcvd_ieof2;
	437	chan_write_failed = chan_write_failed2;
	438	chan_obuf_empty = chan_obuf_empty2;
	439
	440	chan_delete_if_full_closed = chan_delete_if_full_closed2;
	441	} else {
	442	chan_rcvd_oclose = chan_rcvd_oclose1;
	443	chan_read_failed = chan_read_failed_12;
	444	chan_ibuf_empty = chan_ibuf_empty1;
	445
	446	chan_rcvd_ieof = chan_rcvd_ieof1;
	447	chan_write_failed = chan_write_failed1;
	448	chan_obuf_empty = chan_obuf_empty1;
	449
	450	chan_delete_if_full_closed = chan_delete_if_full_closed1;
	451	}
	452	}
	453
	454	/* helper */
	455	static void
	456	chan_shutdown_write(Channel *c)
	457	{
	458	buffer_consume(&c->output, buffer_len(&c->output));
	459	if (compat20 && c->type == SSH_CHANNEL_LARVAL)
	460	return;
	461	/* shutdown failure is allowed if write failed already */
	462	debug("channel %d: close_write", c->self);
	463	if (c->sock != -1) {
	464	if (shutdown(c->sock, SHUT_WR) < 0)
	465	debug("channel %d: chan_shutdown_write: shutdown() failed for fd%d: %.100s",
	466	c->self, c->sock, strerror(errno));
	467	} else {
	468	if (close(c->wfd) < 0)
	469	log("channel %d: chan_shutdown_write: close() failed for fd%d: %.100s",
	470	c->self, c->wfd, strerror(errno));
	471	c->wfd = -1;
	472	}
	473	}
	474	static void
	475	chan_shutdown_read(Channel *c)
	476	{
	477	if (compat20 && c->type == SSH_CHANNEL_LARVAL)
	478	return;
	479	debug("channel %d: close_read", c->self);
	480	if (c->sock != -1) {
47670e77	481	/*
	482	* shutdown(sock, SHUT_READ) may return ENOTCONN if the
	483	* write side has been closed already. (bug on Linux)
	484	*/
	485	if (shutdown(c->sock, SHUT_RD) < 0
	486	&& (errno != ENOTCONN
	487	\|\| c->ostate == CHAN_OUTPUT_OPEN
	488	\|\| c->ostate == CHAN_OUTPUT_WAIT_DRAIN))
7e7327a1	489	error("channel %d: chan_shutdown_read: shutdown() failed for fd%d [i%d o%d]: %.100s",
	490	c->self, c->sock, c->istate, c->ostate, strerror(errno));
	491	} else {
	492	if (close(c->rfd) < 0)
	493	log("channel %d: chan_shutdown_read: close() failed for fd%d: %.100s",
	494	c->self, c->rfd, strerror(errno));
	495	c->rfd = -1;
	496	}
8efc0c15	497	}