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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/ssh/lib/../nchan.c	Lines:	98	194	50.5 %
Date:	2017-11-07	Branches:	53	131	40.5 %


/* $OpenBSD: nchan.c,v 1.67 2017/09/12 06:35:32 djm Exp $ */
/*
 * 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 <sys/types.h>
#include <sys/socket.h>
#include <sys/queue.h>

#include <errno.h>
#include <string.h>
#include <stdarg.h>

#include "ssh2.h"
#include "sshbuf.h"
#include "ssherr.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_eof2(struct ssh *, Channel *);
static void	chan_send_eow2(struct ssh *, Channel *);

/* helper */
static void	chan_shutdown_write(struct ssh *, Channel *);
static void	chan_shutdown_read(struct ssh *, Channel *);

static const char *ostates[] = { "open", "drain", "wait_ieof", "closed" };
static const 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);
	debug2("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);
	debug2("channel %d: output %s -> %s", c->self, ostates[c->ostate],
	    ostates[next]);
	c->ostate = next;
}

void
chan_read_failed(struct ssh *ssh, Channel *c)
{
	debug2("channel %d: read failed", c->self);
	switch (c->istate) {
	case CHAN_INPUT_OPEN:
		chan_shutdown_read(ssh, 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(struct ssh *ssh, Channel *c)
{
	debug2("channel %d: ibuf empty", c->self);
	if (sshbuf_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 (!(c->flags & (CHAN_CLOSE_SENT|CHAN_LOCAL)))
			chan_send_eof2(ssh, c);
		chan_set_istate(c, CHAN_INPUT_CLOSED);
		break;
	default:
		error("channel %d: chan_ibuf_empty for istate %d",
		    c->self, c->istate);
		break;
	}
}

void
chan_obuf_empty(struct ssh *ssh, Channel *c)
{
	debug2("channel %d: obuf empty", c->self);
	if (sshbuf_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(ssh, 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;
	}
}

void
chan_rcvd_eow(struct ssh *ssh, Channel *c)
{
	debug2("channel %d: rcvd eow", c->self);
	switch (c->istate) {
	case CHAN_INPUT_OPEN:
		chan_shutdown_read(ssh, c);
		chan_set_istate(c, CHAN_INPUT_CLOSED);
		break;
	}
}

static void
chan_send_eof2(struct ssh *ssh, Channel *c)
{
	int r;

	debug2("channel %d: send eof", c->self);
	switch (c->istate) {
	case CHAN_INPUT_WAIT_DRAIN:
		if (!c->have_remote_id)
			fatal("%s: channel %d: no remote_id",
			    __func__, c->self);
		if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_EOF)) != 0 ||
		    (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
		    (r = sshpkt_send(ssh)) != 0)
			fatal("%s: send CHANNEL_EOF: %s", __func__, ssh_err(r));
		c->flags |= CHAN_EOF_SENT;
		break;
	default:
		error("channel %d: cannot send eof for istate %d",
		    c->self, c->istate);
		break;
	}
}

static void
chan_send_close2(struct ssh *ssh, Channel *c)
{
	int r;

	debug2("channel %d: send close", c->self);
	if (c->ostate != CHAN_OUTPUT_CLOSED ||
	    c->istate != CHAN_INPUT_CLOSED) {
		error("channel %d: cannot send close for istate/ostate %d/%d",
		    c->self, c->istate, c->ostate);
	} else if (c->flags & CHAN_CLOSE_SENT) {
		error("channel %d: already sent close", c->self);
	} else {
		if (!c->have_remote_id)
			fatal("%s: channel %d: no remote_id",
			    __func__, c->self);
		if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_CLOSE)) != 0 ||
		    (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
		    (r = sshpkt_send(ssh)) != 0)
			fatal("%s: send CHANNEL_EOF: %s", __func__, ssh_err(r));
		c->flags |= CHAN_CLOSE_SENT;
	}
}

static void
chan_send_eow2(struct ssh *ssh, Channel *c)
{
	int r;

	debug2("channel %d: send eow", c->self);
	if (c->ostate == CHAN_OUTPUT_CLOSED) {
		error("channel %d: must not sent eow on closed output",
		    c->self);
		return;
	}
	if (!(datafellows & SSH_NEW_OPENSSH))
		return;
	if (!c->have_remote_id)
		fatal("%s: channel %d: no remote_id", __func__, c->self);
	if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_REQUEST)) != 0 ||
	    (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
	    (r = sshpkt_put_cstring(ssh, "eow@openssh.com")) != 0 ||
	    (r = sshpkt_put_u8(ssh, 0)) != 0 ||
	    (r = sshpkt_send(ssh)) != 0)
		fatal("%s: send CHANNEL_EOF: %s", __func__, ssh_err(r));
}

/* shared */

void
chan_rcvd_ieof(struct ssh *ssh, Channel *c)
{
	debug2("channel %d: rcvd eof", c->self);
	c->flags |= CHAN_EOF_RCVD;
	if (c->ostate == CHAN_OUTPUT_OPEN)
		chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN);
	if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN &&
	    sshbuf_len(c->output) == 0 &&
	    !CHANNEL_EFD_OUTPUT_ACTIVE(c))
		chan_obuf_empty(ssh, c);
}

void
chan_rcvd_oclose(struct ssh *ssh, Channel *c)
{
	debug2("channel %d: rcvd close", c->self);
	if (!(c->flags & CHAN_LOCAL)) {
		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;
	}
	switch (c->istate) {
	case CHAN_INPUT_OPEN:
		chan_shutdown_read(ssh, c);
		chan_set_istate(c, CHAN_INPUT_CLOSED);
		break;
	case CHAN_INPUT_WAIT_DRAIN:
		if (!(c->flags & CHAN_LOCAL))
			chan_send_eof2(ssh, c);
		chan_set_istate(c, CHAN_INPUT_CLOSED);
		break;
	}
}

void
chan_write_failed(struct ssh *ssh, Channel *c)
{
	debug2("channel %d: write failed", c->self);
	switch (c->ostate) {
	case CHAN_OUTPUT_OPEN:
	case CHAN_OUTPUT_WAIT_DRAIN:
		chan_shutdown_write(ssh, c);
		if (strcmp(c->ctype, "session") == 0)
			chan_send_eow2(ssh, 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_mark_dead(struct ssh *ssh, Channel *c)
{
	c->type = SSH_CHANNEL_ZOMBIE;
}

int
chan_is_dead(struct ssh *ssh, Channel *c, int do_send)
{
	if (c->type == SSH_CHANNEL_ZOMBIE) {
		debug2("channel %d: zombie", c->self);
		return 1;
	}
	if (c->istate != CHAN_INPUT_CLOSED || c->ostate != CHAN_OUTPUT_CLOSED)
		return 0;
	if ((datafellows & SSH_BUG_EXTEOF) &&
	    c->extended_usage == CHAN_EXTENDED_WRITE &&
	    c->efd != -1 &&
	    sshbuf_len(c->extended) > 0) {
		debug2("channel %d: active efd: %d len %zu",
		    c->self, c->efd, sshbuf_len(c->extended));
		return 0;
	}
	if (c->flags & CHAN_LOCAL) {
		debug2("channel %d: is dead (local)", c->self);
		return 1;
	}
	if (!(c->flags & CHAN_CLOSE_SENT)) {
		if (do_send) {
			chan_send_close2(ssh, c);
		} else {
			/* channel would be dead if we sent a close */
			if (c->flags & CHAN_CLOSE_RCVD) {
				debug2("channel %d: almost dead",
				    c->self);
				return 1;
			}
		}
	}
	if ((c->flags & CHAN_CLOSE_SENT) &&
	    (c->flags & CHAN_CLOSE_RCVD)) {
		debug2("channel %d: is dead", c->self);
		return 1;
	}
	return 0;
}

/* helper */
static void
chan_shutdown_write(struct ssh *ssh, Channel *c)
{
	sshbuf_reset(c->output);
	if (c->type == SSH_CHANNEL_LARVAL)
		return;
	/* shutdown failure is allowed if write failed already */
	debug2("channel %d: close_write", c->self);
	if (c->sock != -1) {
		if (shutdown(c->sock, SHUT_WR) < 0)
			debug2("channel %d: chan_shutdown_write: "
			    "shutdown() failed for fd %d: %.100s",
			    c->self, c->sock, strerror(errno));
	} else {
		if (channel_close_fd(ssh, &c->wfd) < 0)
			logit("channel %d: chan_shutdown_write: "
			    "close() failed for fd %d: %.100s",
			    c->self, c->wfd, strerror(errno));
	}
}

static void
chan_shutdown_read(struct ssh *ssh, Channel *c)
{
	if (c->type == SSH_CHANNEL_LARVAL)
		return;
	debug2("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 (channel_close_fd(ssh, &c->rfd) < 0)
			logit("channel %d: chan_shutdown_read: "
			    "close() failed for fd %d: %.100s",
			    c->self, c->rfd, strerror(errno));
	}
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: nchan.c,v 1.67 2017/09/12 06:35:32 djm Exp $ */
2			/*
3			* Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
4			*
5			* Redistribution and use in source and binary forms, with or without
6			* modification, are permitted provided that the following conditions
7			* are met:
8			* 1. Redistributions of source code must retain the above copyright
9			* notice, this list of conditions and the following disclaimer.
10			* 2. Redistributions in binary form must reproduce the above copyright
11			* notice, this list of conditions and the following disclaimer in the
12			* documentation and/or other materials provided with the distribution.
13			*
14			* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15			* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16			* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17			* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18			* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19			* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20			* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21			* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22			* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23			* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24			*/
25
26			#include <sys/types.h>
27			#include <sys/socket.h>
28			#include <sys/queue.h>
29
30			#include <errno.h>
31			#include <string.h>
32			#include <stdarg.h>
33
34			#include "ssh2.h"
35			#include "sshbuf.h"
36			#include "ssherr.h"
37			#include "packet.h"
38			#include "channels.h"
39			#include "compat.h"
40			#include "log.h"
41
42			/*
43			* SSH Protocol 1.5 aka New Channel Protocol
44			* Thanks to Martina, Axel and everyone who left Erlangen, leaving me bored.
45			* Written by Markus Friedl in October 1999
46			*
47			* Protocol versions 1.3 and 1.5 differ in the handshake protocol used for the
48			* tear down of channels:
49			*
50			* 1.3: strict request-ack-protocol:
51			* CLOSE ->
52			* <- CLOSE_CONFIRM
53			*
54			* 1.5: uses variations of:
55			* IEOF ->
56			* <- OCLOSE
57			* <- IEOF
58			* OCLOSE ->
59			* i.e. both sides have to close the channel
60			*
61			* 2.0: the EOF messages are optional
62			*
63			* See the debugging output from 'ssh -v' and 'sshd -d' of
64			* ssh-1.2.27 as an example.
65			*
66			*/
67
68			/* functions manipulating channel states */
69			/*
70			* EVENTS update channel input/output states execute ACTIONS
71			*/
72			/*
73			* ACTIONS: should never update the channel states
74			*/
75			static void chan_send_eof2(struct ssh , Channel );
76			static void chan_send_eow2(struct ssh , Channel );
77
78			/* helper */
79			static void chan_shutdown_write(struct ssh , Channel );
80			static void chan_shutdown_read(struct ssh , Channel );
81
82			static const char *ostates[] = { "open", "drain", "wait_ieof", "closed" };
83			static const char *istates[] = { "open", "drain", "wait_oclose", "closed" };
84
85			static void
86			chan_set_istate(Channel *c, u_int next)
87			{
88	✗✓	4	if (c->istate > CHAN_INPUT_CLOSED \|\| next > CHAN_INPUT_CLOSED)
89			fatal("chan_set_istate: bad state %d -> %d", c->istate, next);
90		4	debug2("channel %d: input %s -> %s", c->self, istates[c->istate],
91		2	istates[next]);
92		2	c->istate = next;
93		2	}
94
95			static void
96			chan_set_ostate(Channel *c, u_int next)
97			{
98	✗✓	4	if (c->ostate > CHAN_OUTPUT_CLOSED \|\| next > CHAN_OUTPUT_CLOSED)
99			fatal("chan_set_ostate: bad state %d -> %d", c->ostate, next);
100		4	debug2("channel %d: output %s -> %s", c->self, ostates[c->ostate],
101		2	ostates[next]);
102		2	c->ostate = next;
103		2	}
104
105			void
106			chan_read_failed(struct ssh ssh, Channel c)
107			{
108		2	debug2("channel %d: read failed", c->self);
109	✓✗	1	switch (c->istate) {
110			case CHAN_INPUT_OPEN:
111		1	chan_shutdown_read(ssh, c);
112		1	chan_set_istate(c, CHAN_INPUT_WAIT_DRAIN);
113		1	break;
114			default:
115			error("channel %d: chan_read_failed for istate %d",
116			c->self, c->istate);
117			break;
118			}
119		1	}
120
121			void
122			chan_ibuf_empty(struct ssh ssh, Channel c)
123			{
124		2	debug2("channel %d: ibuf empty", c->self);
125	✗✓	1	if (sshbuf_len(c->input)) {
126			error("channel %d: chan_ibuf_empty for non empty buffer",
127			c->self);
128			return;
129			}
130	✓✗	1	switch (c->istate) {
131			case CHAN_INPUT_WAIT_DRAIN:
132	✓✗	1	if (!(c->flags & (CHAN_CLOSE_SENT\|CHAN_LOCAL)))
133		1	chan_send_eof2(ssh, c);
134		1	chan_set_istate(c, CHAN_INPUT_CLOSED);
135		1	break;
136			default:
137			error("channel %d: chan_ibuf_empty for istate %d",
138			c->self, c->istate);
139			break;
140			}
141		1	}
142
143			void
144			chan_obuf_empty(struct ssh ssh, Channel c)
145			{
146		2	debug2("channel %d: obuf empty", c->self);
147	✗✓	1	if (sshbuf_len(c->output)) {
148			error("channel %d: chan_obuf_empty for non empty buffer",
149			c->self);
150			return;
151			}
152	✓✗	1	switch (c->ostate) {
153			case CHAN_OUTPUT_WAIT_DRAIN:
154		1	chan_shutdown_write(ssh, c);
155		1	chan_set_ostate(c, CHAN_OUTPUT_CLOSED);
156		1	break;
157			default:
158			error("channel %d: internal error: obuf_empty for ostate %d",
159			c->self, c->ostate);
160			break;
161			}
162		1	}
163
164			void
165			chan_rcvd_eow(struct ssh ssh, Channel c)
166			{
167			debug2("channel %d: rcvd eow", c->self);
168			switch (c->istate) {
169			case CHAN_INPUT_OPEN:
170			chan_shutdown_read(ssh, c);
171			chan_set_istate(c, CHAN_INPUT_CLOSED);
172			break;
173			}
174			}
175
176			static void
177			chan_send_eof2(struct ssh ssh, Channel c)
178			{
179			int r;
180
181		2	debug2("channel %d: send eof", c->self);
182	✓✗	1	switch (c->istate) {
183			case CHAN_INPUT_WAIT_DRAIN:
184	✗✓	1	if (!c->have_remote_id)
185			fatal("%s: channel %d: no remote_id",
186			__func__, c->self);
187	✓✗✗✓	2	if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_EOF)) != 0 \|\|
188	✓✗	1	(r = sshpkt_put_u32(ssh, c->remote_id)) != 0 \|\|
189		1	(r = sshpkt_send(ssh)) != 0)
190			fatal("%s: send CHANNEL_EOF: %s", __func__, ssh_err(r));
191		1	c->flags \|= CHAN_EOF_SENT;
192		1	break;
193			default:
194			error("channel %d: cannot send eof for istate %d",
195			c->self, c->istate);
196			break;
197			}
198		1	}
199
200			static void
201			chan_send_close2(struct ssh ssh, Channel c)
202			{
203			int r;
204
205		2	debug2("channel %d: send close", c->self);
206	✓✗✗✓	2	if (c->ostate != CHAN_OUTPUT_CLOSED \|\|
207		1	c->istate != CHAN_INPUT_CLOSED) {
208			error("channel %d: cannot send close for istate/ostate %d/%d",
209			c->self, c->istate, c->ostate);
210	✗✓	1	} else if (c->flags & CHAN_CLOSE_SENT) {
211			error("channel %d: already sent close", c->self);
212			} else {
213	✗✓	1	if (!c->have_remote_id)
214			fatal("%s: channel %d: no remote_id",
215			__func__, c->self);
216	✓✗✗✓	2	if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_CLOSE)) != 0 \|\|
217	✓✗	1	(r = sshpkt_put_u32(ssh, c->remote_id)) != 0 \|\|
218		1	(r = sshpkt_send(ssh)) != 0)
219			fatal("%s: send CHANNEL_EOF: %s", __func__, ssh_err(r));
220		1	c->flags \|= CHAN_CLOSE_SENT;
221			}
222		1	}
223
224			static void
225			chan_send_eow2(struct ssh ssh, Channel c)
226			{
227			int r;
228
229			debug2("channel %d: send eow", c->self);
230			if (c->ostate == CHAN_OUTPUT_CLOSED) {
231			error("channel %d: must not sent eow on closed output",
232			c->self);
233			return;
234			}
235			if (!(datafellows & SSH_NEW_OPENSSH))
236			return;
237			if (!c->have_remote_id)
238			fatal("%s: channel %d: no remote_id", __func__, c->self);
239			if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_REQUEST)) != 0 \|\|
240			(r = sshpkt_put_u32(ssh, c->remote_id)) != 0 \|\|
241			(r = sshpkt_put_cstring(ssh, "eow@openssh.com")) != 0 \|\|
242			(r = sshpkt_put_u8(ssh, 0)) != 0 \|\|
243			(r = sshpkt_send(ssh)) != 0)
244			fatal("%s: send CHANNEL_EOF: %s", __func__, ssh_err(r));
245			}
246
247			/* shared */
248
249			void
250			chan_rcvd_ieof(struct ssh ssh, Channel c)
251			{
252		2	debug2("channel %d: rcvd eof", c->self);
253		1	c->flags \|= CHAN_EOF_RCVD;
254	✓✗	1	if (c->ostate == CHAN_OUTPUT_OPEN)
255		1	chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN);
256	✓✗✓✗	2	if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN &&
257	✓✗	1	sshbuf_len(c->output) == 0 &&
258	✓✗✓✗ ✓✗	4	!CHANNEL_EFD_OUTPUT_ACTIVE(c))
259		1	chan_obuf_empty(ssh, c);
260		1	}
261
262			void
263			chan_rcvd_oclose(struct ssh ssh, Channel c)
264			{
265		2	debug2("channel %d: rcvd close", c->self);
266	✓✗	1	if (!(c->flags & CHAN_LOCAL)) {
267	✗✓	1	if (c->flags & CHAN_CLOSE_RCVD)
268			error("channel %d: protocol error: close rcvd twice",
269			c->self);
270		1	c->flags \|= CHAN_CLOSE_RCVD;
271		1	}
272	✗✓	1	if (c->type == SSH_CHANNEL_LARVAL) {
273			/* tear down larval channels immediately */
274			chan_set_ostate(c, CHAN_OUTPUT_CLOSED);
275			chan_set_istate(c, CHAN_INPUT_CLOSED);
276			return;
277			}
278	✗✓	1	switch (c->ostate) {
279			case CHAN_OUTPUT_OPEN:
280			/*
281			* wait until a data from the channel is consumed if a CLOSE
282			* is received
283			*/
284			chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN);
285			break;
286			}
287	✗✗✓	1	switch (c->istate) {
288			case CHAN_INPUT_OPEN:
289			chan_shutdown_read(ssh, c);
290			chan_set_istate(c, CHAN_INPUT_CLOSED);
291			break;
292			case CHAN_INPUT_WAIT_DRAIN:
293			if (!(c->flags & CHAN_LOCAL))
294			chan_send_eof2(ssh, c);
295			chan_set_istate(c, CHAN_INPUT_CLOSED);
296			break;
297			}
298		1	}
299
300			void
301			chan_write_failed(struct ssh ssh, Channel c)
302			{
303			debug2("channel %d: write failed", c->self);
304			switch (c->ostate) {
305			case CHAN_OUTPUT_OPEN:
306			case CHAN_OUTPUT_WAIT_DRAIN:
307			chan_shutdown_write(ssh, c);
308			if (strcmp(c->ctype, "session") == 0)
309			chan_send_eow2(ssh, c);
310			chan_set_ostate(c, CHAN_OUTPUT_CLOSED);
311			break;
312			default:
313			error("channel %d: chan_write_failed for ostate %d",
314			c->self, c->ostate);
315			break;
316			}
317			}
318
319			void
320			chan_mark_dead(struct ssh ssh, Channel c)
321			{
322			c->type = SSH_CHANNEL_ZOMBIE;
323			}
324
325			int
326			chan_is_dead(struct ssh ssh, Channel c, int do_send)
327			{
328	✗✓	293600	if (c->type == SSH_CHANNEL_ZOMBIE) {
329			debug2("channel %d: zombie", c->self);
330			return 1;
331			}
332	✓✓✓✓	146808	if (c->istate != CHAN_INPUT_CLOSED \|\| c->ostate != CHAN_OUTPUT_CLOSED)
333		146796	return 0;
334	✗✓✗✗	4	if ((datafellows & SSH_BUG_EXTEOF) &&
335			c->extended_usage == CHAN_EXTENDED_WRITE &&
336			c->efd != -1 &&
337			sshbuf_len(c->extended) > 0) {
338			debug2("channel %d: active efd: %d len %zu",
339			c->self, c->efd, sshbuf_len(c->extended));
340			return 0;
341			}
342	✗✓	4	if (c->flags & CHAN_LOCAL) {
343			debug2("channel %d: is dead (local)", c->self);
344			return 1;
345			}
346	✓✗	4	if (!(c->flags & CHAN_CLOSE_SENT)) {
347	✓✓	4	if (do_send) {
348		1	chan_send_close2(ssh, c);
349		1	} else {
350			/* channel would be dead if we sent a close */
351	✓✓	3	if (c->flags & CHAN_CLOSE_RCVD) {
352		1	debug2("channel %d: almost dead",
353		1	c->self);
354		1	return 1;
355			}
356			}
357			}
358	✓✓✓✗	4	if ((c->flags & CHAN_CLOSE_SENT) &&
359		1	(c->flags & CHAN_CLOSE_RCVD)) {
360		1	debug2("channel %d: is dead", c->self);
361		1	return 1;
362			}
363		2	return 0;
364		146800	}
365
366			/* helper */
367			static void
368			chan_shutdown_write(struct ssh ssh, Channel c)
369			{
370		2	sshbuf_reset(c->output);
371	✓✗	1	if (c->type == SSH_CHANNEL_LARVAL)
372			return;
373			/* shutdown failure is allowed if write failed already */
374		1	debug2("channel %d: close_write", c->self);
375	✗✓	1	if (c->sock != -1) {
376			if (shutdown(c->sock, SHUT_WR) < 0)
377			debug2("channel %d: chan_shutdown_write: "
378			"shutdown() failed for fd %d: %.100s",
379			c->self, c->sock, strerror(errno));
380			} else {
381	✗✓	1	if (channel_close_fd(ssh, &c->wfd) < 0)
382			logit("channel %d: chan_shutdown_write: "
383			"close() failed for fd %d: %.100s",
384			c->self, c->wfd, strerror(errno));
385			}
386		1	}
387
388			static void
389			chan_shutdown_read(struct ssh ssh, Channel c)
390			{
391	✓✗	2	if (c->type == SSH_CHANNEL_LARVAL)
392			return;
393		1	debug2("channel %d: close_read", c->self);
394	✗✓	1	if (c->sock != -1) {
395			if (shutdown(c->sock, SHUT_RD) < 0)
396			error("channel %d: chan_shutdown_read: "
397			"shutdown() failed for fd %d [i%d o%d]: %.100s",
398			c->self, c->sock, c->istate, c->ostate,
399			strerror(errno));
400			} else {
401	✗✓	1	if (channel_close_fd(ssh, &c->rfd) < 0)
402			logit("channel %d: chan_shutdown_read: "
403			"close() failed for fd %d: %.100s",
404			c->self, c->rfd, strerror(errno));
405			}
406		1	}