blob: 8e1be2d36b9c3b93a58554493954b37292360132 [file] [log] [blame]
Damien Miller5428f641999-11-25 11:54:57 +11001/*
Ben Lindstrom44697232001-07-04 03:32:30 +00002 * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
Damien Miller5428f641999-11-25 11:54:57 +11003 *
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.
Damien Miller5428f641999-11-25 11:54:57 +110012 *
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
Damien Millerd4a8b7e1999-10-27 13:42:43 +100025#include "includes.h"
Ben Lindstrom44697232001-07-04 03:32:30 +000026RCSID("$OpenBSD: nchan.c,v 1.30 2001/06/25 08:25:38 markus Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100027
Ben Lindstrom226cfa02001-01-22 05:34:40 +000028#include "ssh1.h"
29#include "ssh2.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100030#include "buffer.h"
31#include "packet.h"
32#include "channels.h"
Damien Miller33b13562000-04-04 14:38:59 +100033#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000034#include "log.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100035
Ben Lindstrom3b670d02001-06-09 00:57:39 +000036/*
37 * SSH Protocol 1.5 aka New Channel Protocol
38 * Thanks to Martina, Axel and everyone who left Erlangen, leaving me bored.
39 * Written by Markus Friedl in October 1999
40 *
41 * Protocol versions 1.3 and 1.5 differ in the handshake protocol used for the
42 * tear down of channels:
43 *
44 * 1.3: strict request-ack-protocol:
45 * CLOSE ->
46 * <- CLOSE_CONFIRM
47 *
48 * 1.5: uses variations of:
49 * IEOF ->
50 * <- OCLOSE
51 * <- IEOF
52 * OCLOSE ->
53 * i.e. both sides have to close the channel
54 *
55 * 2.0: the EOF messages are optional
56 *
57 * See the debugging output from 'ssh -v' and 'sshd -d' of
58 * ssh-1.2.27 as an example.
59 *
60 */
61
Damien Miller33b13562000-04-04 14:38:59 +100062/* functions manipulating channel states */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100063/*
Damien Miller95def091999-11-25 00:26:21 +110064 * EVENTS update channel input/output states execute ACTIONS
Damien Millerd4a8b7e1999-10-27 13:42:43 +100065 */
66/* events concerning the INPUT from socket for channel (istate) */
Damien Miller33b13562000-04-04 14:38:59 +100067chan_event_fn *chan_rcvd_oclose = NULL;
68chan_event_fn *chan_read_failed = NULL;
69chan_event_fn *chan_ibuf_empty = NULL;
70/* events concerning the OUTPUT from channel for socket (ostate) */
71chan_event_fn *chan_rcvd_ieof = NULL;
72chan_event_fn *chan_write_failed = NULL;
73chan_event_fn *chan_obuf_empty = NULL;
74/*
75 * ACTIONS: should never update the channel states
76 */
Ben Lindstrombba81212001-06-25 05:01:22 +000077static void chan_send_ieof1(Channel *);
78static void chan_send_oclose1(Channel *);
79static void chan_send_close2(Channel *);
80static void chan_send_eof2(Channel *);
Damien Miller33b13562000-04-04 14:38:59 +100081
Damien Miller33b13562000-04-04 14:38:59 +100082/* helper */
Ben Lindstrombba81212001-06-25 05:01:22 +000083static void chan_shutdown_write(Channel *);
84static void chan_shutdown_read(Channel *);
Damien Miller33b13562000-04-04 14:38:59 +100085
86/*
87 * SSH1 specific implementation of event functions
88 */
89
90static void
91chan_rcvd_oclose1(Channel *c)
Damien Miller95def091999-11-25 00:26:21 +110092{
Damien Miller33b13562000-04-04 14:38:59 +100093 debug("channel %d: rcvd oclose", c->self);
Damien Miller95def091999-11-25 00:26:21 +110094 switch (c->istate) {
Damien Millerd4a8b7e1999-10-27 13:42:43 +100095 case CHAN_INPUT_WAIT_OCLOSE:
Damien Miller33b13562000-04-04 14:38:59 +100096 debug("channel %d: input wait_oclose -> closed", c->self);
Damien Miller95def091999-11-25 00:26:21 +110097 c->istate = CHAN_INPUT_CLOSED;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100098 break;
99 case CHAN_INPUT_OPEN:
Damien Miller33b13562000-04-04 14:38:59 +1000100 debug("channel %d: input open -> closed", c->self);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000101 chan_shutdown_read(c);
Damien Miller33b13562000-04-04 14:38:59 +1000102 chan_send_ieof1(c);
Damien Miller95def091999-11-25 00:26:21 +1100103 c->istate = CHAN_INPUT_CLOSED;
Damien Miller34132e52000-01-14 15:45:46 +1100104 break;
105 case CHAN_INPUT_WAIT_DRAIN:
106 /* both local read_failed and remote write_failed */
Damien Miller33b13562000-04-04 14:38:59 +1000107 log("channel %d: input drain -> closed", c->self);
108 chan_send_ieof1(c);
Damien Miller34132e52000-01-14 15:45:46 +1100109 c->istate = CHAN_INPUT_CLOSED;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000110 break;
111 default:
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000112 error("channel %d: protocol error: rcvd_oclose for istate %d",
Damien Miller33b13562000-04-04 14:38:59 +1000113 c->self, c->istate);
Damien Miller34132e52000-01-14 15:45:46 +1100114 return;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000115 }
116}
Damien Miller33b13562000-04-04 14:38:59 +1000117static void
118chan_read_failed_12(Channel *c)
Damien Miller95def091999-11-25 00:26:21 +1100119{
Damien Miller33b13562000-04-04 14:38:59 +1000120 debug("channel %d: read failed", c->self);
Damien Miller95def091999-11-25 00:26:21 +1100121 switch (c->istate) {
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000122 case CHAN_INPUT_OPEN:
Damien Miller33b13562000-04-04 14:38:59 +1000123 debug("channel %d: input open -> drain", c->self);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000124 chan_shutdown_read(c);
Damien Miller95def091999-11-25 00:26:21 +1100125 c->istate = CHAN_INPUT_WAIT_DRAIN;
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000126#if 0
Damien Miller30c3d422000-05-09 11:02:59 +1000127 if (buffer_len(&c->input) == 0) {
128 debug("channel %d: input: no drain shortcut", c->self);
129 chan_ibuf_empty(c);
130 }
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000131#endif
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000132 break;
133 default:
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000134 error("channel %d: chan_read_failed for istate %d",
Damien Miller33b13562000-04-04 14:38:59 +1000135 c->self, c->istate);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000136 break;
137 }
138}
Damien Miller33b13562000-04-04 14:38:59 +1000139static void
140chan_ibuf_empty1(Channel *c)
Damien Miller95def091999-11-25 00:26:21 +1100141{
Damien Miller33b13562000-04-04 14:38:59 +1000142 debug("channel %d: ibuf empty", c->self);
Damien Miller95def091999-11-25 00:26:21 +1100143 if (buffer_len(&c->input)) {
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000144 error("channel %d: chan_ibuf_empty for non empty buffer",
Damien Miller33b13562000-04-04 14:38:59 +1000145 c->self);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000146 return;
147 }
Damien Miller95def091999-11-25 00:26:21 +1100148 switch (c->istate) {
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000149 case CHAN_INPUT_WAIT_DRAIN:
Damien Miller33b13562000-04-04 14:38:59 +1000150 debug("channel %d: input drain -> wait_oclose", c->self);
151 chan_send_ieof1(c);
Damien Miller95def091999-11-25 00:26:21 +1100152 c->istate = CHAN_INPUT_WAIT_OCLOSE;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000153 break;
154 default:
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000155 error("channel %d: chan_ibuf_empty for istate %d",
Damien Miller33b13562000-04-04 14:38:59 +1000156 c->self, c->istate);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000157 break;
158 }
159}
Damien Miller33b13562000-04-04 14:38:59 +1000160static void
161chan_rcvd_ieof1(Channel *c)
Damien Miller95def091999-11-25 00:26:21 +1100162{
Damien Miller33b13562000-04-04 14:38:59 +1000163 debug("channel %d: rcvd ieof", c->self);
Damien Millere247cc42000-05-07 12:03:14 +1000164 if (c->type != SSH_CHANNEL_OPEN) {
165 debug("channel %d: non-open", c->self);
166 if (c->istate == CHAN_INPUT_OPEN) {
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000167 debug("channel %d: non-open: input open -> wait_oclose",
168 c->self);
Damien Millere247cc42000-05-07 12:03:14 +1000169 chan_shutdown_read(c);
170 chan_send_ieof1(c);
171 c->istate = CHAN_INPUT_WAIT_OCLOSE;
172 } else {
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000173 error("channel %d: non-open: istate %d != open",
174 c->self, c->istate);
Damien Millere247cc42000-05-07 12:03:14 +1000175 }
176 if (c->ostate == CHAN_OUTPUT_OPEN) {
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000177 debug("channel %d: non-open: output open -> closed",
178 c->self);
Damien Millere247cc42000-05-07 12:03:14 +1000179 chan_send_oclose1(c);
180 c->ostate = CHAN_OUTPUT_CLOSED;
181 } else {
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000182 error("channel %d: non-open: ostate %d != open",
183 c->self, c->ostate);
Damien Millere247cc42000-05-07 12:03:14 +1000184 }
185 return;
186 }
Damien Miller95def091999-11-25 00:26:21 +1100187 switch (c->ostate) {
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000188 case CHAN_OUTPUT_OPEN:
Damien Miller33b13562000-04-04 14:38:59 +1000189 debug("channel %d: output open -> drain", c->self);
Damien Miller95def091999-11-25 00:26:21 +1100190 c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000191 break;
192 case CHAN_OUTPUT_WAIT_IEOF:
Damien Miller33b13562000-04-04 14:38:59 +1000193 debug("channel %d: output wait_ieof -> closed", c->self);
Damien Miller95def091999-11-25 00:26:21 +1100194 c->ostate = CHAN_OUTPUT_CLOSED;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000195 break;
196 default:
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000197 error("channel %d: protocol error: rcvd_ieof for ostate %d",
Damien Miller33b13562000-04-04 14:38:59 +1000198 c->self, c->ostate);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000199 break;
200 }
201}
Damien Miller33b13562000-04-04 14:38:59 +1000202static void
203chan_write_failed1(Channel *c)
Damien Miller95def091999-11-25 00:26:21 +1100204{
Damien Miller33b13562000-04-04 14:38:59 +1000205 debug("channel %d: write failed", c->self);
Damien Miller95def091999-11-25 00:26:21 +1100206 switch (c->ostate) {
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000207 case CHAN_OUTPUT_OPEN:
Damien Miller33b13562000-04-04 14:38:59 +1000208 debug("channel %d: output open -> wait_ieof", c->self);
209 chan_send_oclose1(c);
Damien Miller95def091999-11-25 00:26:21 +1100210 c->ostate = CHAN_OUTPUT_WAIT_IEOF;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000211 break;
212 case CHAN_OUTPUT_WAIT_DRAIN:
Damien Miller33b13562000-04-04 14:38:59 +1000213 debug("channel %d: output wait_drain -> closed", c->self);
214 chan_send_oclose1(c);
Damien Miller95def091999-11-25 00:26:21 +1100215 c->ostate = CHAN_OUTPUT_CLOSED;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000216 break;
217 default:
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000218 error("channel %d: chan_write_failed for ostate %d",
Damien Miller33b13562000-04-04 14:38:59 +1000219 c->self, c->ostate);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000220 break;
221 }
222}
Damien Miller33b13562000-04-04 14:38:59 +1000223static void
224chan_obuf_empty1(Channel *c)
Damien Miller95def091999-11-25 00:26:21 +1100225{
Damien Miller33b13562000-04-04 14:38:59 +1000226 debug("channel %d: obuf empty", c->self);
Damien Miller95def091999-11-25 00:26:21 +1100227 if (buffer_len(&c->output)) {
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000228 error("channel %d: chan_obuf_empty for non empty buffer",
Damien Miller33b13562000-04-04 14:38:59 +1000229 c->self);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000230 return;
231 }
Damien Miller95def091999-11-25 00:26:21 +1100232 switch (c->ostate) {
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000233 case CHAN_OUTPUT_WAIT_DRAIN:
Damien Miller33b13562000-04-04 14:38:59 +1000234 debug("channel %d: output drain -> closed", c->self);
235 chan_send_oclose1(c);
Damien Miller95def091999-11-25 00:26:21 +1100236 c->ostate = CHAN_OUTPUT_CLOSED;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000237 break;
238 default:
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000239 error("channel %d: internal error: obuf_empty for ostate %d",
Damien Miller33b13562000-04-04 14:38:59 +1000240 c->self, c->ostate);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000241 break;
242 }
243}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000244static void
Damien Miller33b13562000-04-04 14:38:59 +1000245chan_send_ieof1(Channel *c)
Damien Miller95def091999-11-25 00:26:21 +1100246{
Damien Miller33b13562000-04-04 14:38:59 +1000247 debug("channel %d: send ieof", c->self);
Damien Miller95def091999-11-25 00:26:21 +1100248 switch (c->istate) {
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000249 case CHAN_INPUT_OPEN:
250 case CHAN_INPUT_WAIT_DRAIN:
251 packet_start(SSH_MSG_CHANNEL_INPUT_EOF);
252 packet_put_int(c->remote_id);
253 packet_send();
254 break;
255 default:
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000256 error("channel %d: cannot send ieof for istate %d",
Damien Miller33b13562000-04-04 14:38:59 +1000257 c->self, c->istate);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000258 break;
259 }
260}
261static void
Damien Miller33b13562000-04-04 14:38:59 +1000262chan_send_oclose1(Channel *c)
Damien Miller95def091999-11-25 00:26:21 +1100263{
Damien Miller33b13562000-04-04 14:38:59 +1000264 debug("channel %d: send oclose", c->self);
Damien Miller95def091999-11-25 00:26:21 +1100265 switch (c->ostate) {
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000266 case CHAN_OUTPUT_OPEN:
267 case CHAN_OUTPUT_WAIT_DRAIN:
268 chan_shutdown_write(c);
269 buffer_consume(&c->output, buffer_len(&c->output));
270 packet_start(SSH_MSG_CHANNEL_OUTPUT_CLOSE);
271 packet_put_int(c->remote_id);
272 packet_send();
273 break;
274 default:
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000275 error("channel %d: cannot send oclose for ostate %d",
Damien Miller33b13562000-04-04 14:38:59 +1000276 c->self, c->ostate);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000277 break;
278 }
279}
Damien Miller33b13562000-04-04 14:38:59 +1000280
281/*
282 * the same for SSH2
283 */
284static void
285chan_rcvd_oclose2(Channel *c)
286{
287 debug("channel %d: rcvd close", c->self);
288 if (c->flags & CHAN_CLOSE_RCVD)
289 error("channel %d: protocol error: close rcvd twice", c->self);
290 c->flags |= CHAN_CLOSE_RCVD;
291 if (c->type == SSH_CHANNEL_LARVAL) {
292 /* tear down larval channels immediately */
293 c->ostate = CHAN_OUTPUT_CLOSED;
294 c->istate = CHAN_INPUT_CLOSED;
295 return;
296 }
297 switch (c->ostate) {
298 case CHAN_OUTPUT_OPEN:
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000299 /*
300 * wait until a data from the channel is consumed if a CLOSE
301 * is received
302 */
Damien Miller33b13562000-04-04 14:38:59 +1000303 debug("channel %d: output open -> drain", c->self);
304 c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
305 break;
306 }
307 switch (c->istate) {
308 case CHAN_INPUT_OPEN:
309 debug("channel %d: input open -> closed", c->self);
310 chan_shutdown_read(c);
311 break;
312 case CHAN_INPUT_WAIT_DRAIN:
313 debug("channel %d: input drain -> closed", c->self);
314 chan_send_eof2(c);
315 break;
316 }
317 c->istate = CHAN_INPUT_CLOSED;
318}
319static void
320chan_ibuf_empty2(Channel *c)
321{
322 debug("channel %d: ibuf empty", c->self);
323 if (buffer_len(&c->input)) {
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000324 error("channel %d: chan_ibuf_empty for non empty buffer",
Damien Miller33b13562000-04-04 14:38:59 +1000325 c->self);
326 return;
327 }
328 switch (c->istate) {
329 case CHAN_INPUT_WAIT_DRAIN:
330 debug("channel %d: input drain -> closed", c->self);
331 if (!(c->flags & CHAN_CLOSE_SENT))
332 chan_send_eof2(c);
333 c->istate = CHAN_INPUT_CLOSED;
334 break;
335 default:
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000336 error("channel %d: chan_ibuf_empty for istate %d",
Damien Miller33b13562000-04-04 14:38:59 +1000337 c->self, c->istate);
338 break;
339 }
340}
341static void
342chan_rcvd_ieof2(Channel *c)
343{
344 debug("channel %d: rcvd eof", c->self);
345 if (c->ostate == CHAN_OUTPUT_OPEN) {
346 debug("channel %d: output open -> drain", c->self);
347 c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
348 }
349}
350static void
351chan_write_failed2(Channel *c)
352{
353 debug("channel %d: write failed", c->self);
354 switch (c->ostate) {
355 case CHAN_OUTPUT_OPEN:
356 debug("channel %d: output open -> closed", c->self);
Damien Millere247cc42000-05-07 12:03:14 +1000357 chan_shutdown_write(c); /* ?? */
Damien Miller33b13562000-04-04 14:38:59 +1000358 c->ostate = CHAN_OUTPUT_CLOSED;
359 break;
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:
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000366 error("channel %d: chan_write_failed for ostate %d",
Damien Miller33b13562000-04-04 14:38:59 +1000367 c->self, c->ostate);
368 break;
369 }
370}
371static void
372chan_obuf_empty2(Channel *c)
373{
374 debug("channel %d: obuf empty", c->self);
375 if (buffer_len(&c->output)) {
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000376 error("channel %d: chan_obuf_empty for non empty buffer",
Damien Miller33b13562000-04-04 14:38:59 +1000377 c->self);
378 return;
379 }
380 switch (c->ostate) {
381 case CHAN_OUTPUT_WAIT_DRAIN:
382 debug("channel %d: output drain -> closed", c->self);
383 chan_shutdown_write(c);
384 c->ostate = CHAN_OUTPUT_CLOSED;
385 break;
386 default:
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000387 error("channel %d: chan_obuf_empty for ostate %d",
Damien Miller33b13562000-04-04 14:38:59 +1000388 c->self, c->ostate);
389 break;
390 }
391}
392static void
393chan_send_eof2(Channel *c)
394{
395 debug("channel %d: send eof", c->self);
396 switch (c->istate) {
397 case CHAN_INPUT_WAIT_DRAIN:
398 packet_start(SSH2_MSG_CHANNEL_EOF);
399 packet_put_int(c->remote_id);
400 packet_send();
401 break;
402 default:
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000403 error("channel %d: cannot send eof for istate %d",
Damien Miller33b13562000-04-04 14:38:59 +1000404 c->self, c->istate);
405 break;
406 }
407}
408static void
409chan_send_close2(Channel *c)
410{
411 debug("channel %d: send close", c->self);
412 if (c->ostate != CHAN_OUTPUT_CLOSED ||
413 c->istate != CHAN_INPUT_CLOSED) {
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000414 error("channel %d: cannot send close for istate/ostate %d/%d",
Damien Miller33b13562000-04-04 14:38:59 +1000415 c->self, c->istate, c->ostate);
416 } else if (c->flags & CHAN_CLOSE_SENT) {
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000417 error("channel %d: already sent close", c->self);
Damien Miller33b13562000-04-04 14:38:59 +1000418 } else {
419 packet_start(SSH2_MSG_CHANNEL_CLOSE);
420 packet_put_int(c->remote_id);
421 packet_send();
422 c->flags |= CHAN_CLOSE_SENT;
423 }
424}
Ben Lindstrom7fbd4552001-03-05 06:16:11 +0000425
426/* shared */
427
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000428void
429chan_mark_dead(Channel *c)
430{
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000431 c->type = SSH_CHANNEL_ZOMBIE;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000432}
433
Ben Lindstrom7fbd4552001-03-05 06:16:11 +0000434int
435chan_is_dead(Channel *c)
Damien Miller33b13562000-04-04 14:38:59 +1000436{
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000437 if (c->type == SSH_CHANNEL_ZOMBIE) {
438 debug("channel %d: zombie", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000439 return 1;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000440 }
Ben Lindstrom7fbd4552001-03-05 06:16:11 +0000441 if (c->istate != CHAN_INPUT_CLOSED || c->ostate != CHAN_OUTPUT_CLOSED)
442 return 0;
443 if (!compat20) {
444 debug("channel %d: is dead", c->self);
445 return 1;
446 }
447 /*
448 * we have to delay the close message if the efd (for stderr) is
449 * still active
450 */
451 if (((c->extended_usage != CHAN_EXTENDED_IGNORE) &&
452 buffer_len(&c->extended) > 0)
453#if 0
454 || ((c->extended_usage == CHAN_EXTENDED_READ) &&
455 c->efd != -1)
456#endif
457 ) {
458 debug2("channel %d: active efd: %d len %d type %s",
459 c->self, c->efd, buffer_len(&c->extended),
460 c->extended_usage==CHAN_EXTENDED_READ ?
461 "read": "write");
462 } else {
Damien Miller33b13562000-04-04 14:38:59 +1000463 if (!(c->flags & CHAN_CLOSE_SENT)) {
464 chan_send_close2(c);
465 }
Damien Miller4af51302000-04-16 11:18:38 +1000466 if ((c->flags & CHAN_CLOSE_SENT) &&
Damien Miller33b13562000-04-04 14:38:59 +1000467 (c->flags & CHAN_CLOSE_RCVD)) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +0000468 debug("channel %d: is dead", c->self);
469 return 1;
Damien Miller4af51302000-04-16 11:18:38 +1000470 }
Damien Miller33b13562000-04-04 14:38:59 +1000471 }
Ben Lindstrom7fbd4552001-03-05 06:16:11 +0000472 return 0;
Damien Miller33b13562000-04-04 14:38:59 +1000473}
474
Damien Miller33b13562000-04-04 14:38:59 +1000475void
476chan_init_iostates(Channel *c)
477{
478 c->ostate = CHAN_OUTPUT_OPEN;
479 c->istate = CHAN_INPUT_OPEN;
480 c->flags = 0;
481}
482
483/* init */
484void
485chan_init(void)
486{
487 if (compat20) {
488 chan_rcvd_oclose = chan_rcvd_oclose2;
489 chan_read_failed = chan_read_failed_12;
490 chan_ibuf_empty = chan_ibuf_empty2;
491
492 chan_rcvd_ieof = chan_rcvd_ieof2;
493 chan_write_failed = chan_write_failed2;
494 chan_obuf_empty = chan_obuf_empty2;
Damien Miller33b13562000-04-04 14:38:59 +1000495 } else {
496 chan_rcvd_oclose = chan_rcvd_oclose1;
497 chan_read_failed = chan_read_failed_12;
498 chan_ibuf_empty = chan_ibuf_empty1;
499
500 chan_rcvd_ieof = chan_rcvd_ieof1;
501 chan_write_failed = chan_write_failed1;
502 chan_obuf_empty = chan_obuf_empty1;
Damien Miller33b13562000-04-04 14:38:59 +1000503 }
504}
Damien Miller95def091999-11-25 00:26:21 +1100505
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000506/* helper */
507static void
Damien Miller95def091999-11-25 00:26:21 +1100508chan_shutdown_write(Channel *c)
509{
Damien Miller33b13562000-04-04 14:38:59 +1000510 buffer_consume(&c->output, buffer_len(&c->output));
511 if (compat20 && c->type == SSH_CHANNEL_LARVAL)
512 return;
Damien Miller5428f641999-11-25 11:54:57 +1100513 /* shutdown failure is allowed if write failed already */
Damien Miller33b13562000-04-04 14:38:59 +1000514 debug("channel %d: close_write", c->self);
515 if (c->sock != -1) {
516 if (shutdown(c->sock, SHUT_WR) < 0)
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000517 debug("channel %d: chan_shutdown_write: "
518 "shutdown() failed for fd%d: %.100s",
Damien Miller33b13562000-04-04 14:38:59 +1000519 c->self, c->sock, strerror(errno));
520 } else {
521 if (close(c->wfd) < 0)
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000522 log("channel %d: chan_shutdown_write: "
523 "close() failed for fd%d: %.100s",
Damien Miller33b13562000-04-04 14:38:59 +1000524 c->self, c->wfd, strerror(errno));
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000525 c->wfd = -1;
Damien Miller33b13562000-04-04 14:38:59 +1000526 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000527}
528static void
Damien Miller95def091999-11-25 00:26:21 +1100529chan_shutdown_read(Channel *c)
530{
Damien Miller33b13562000-04-04 14:38:59 +1000531 if (compat20 && c->type == SSH_CHANNEL_LARVAL)
532 return;
533 debug("channel %d: close_read", c->self);
534 if (c->sock != -1) {
Kevin Stevesef4eea92001-02-05 12:42:17 +0000535 /*
Damien Miller0f091bd2000-08-07 15:47:48 +1000536 * shutdown(sock, SHUT_READ) may return ENOTCONN if the
537 * write side has been closed already. (bug on Linux)
Kevin Stevesefe5fd82001-04-03 13:02:48 +0000538 * HP-UX will return EINVAL.
Damien Miller0f091bd2000-08-07 15:47:48 +1000539 */
540 if (shutdown(c->sock, SHUT_RD) < 0
Kevin Stevesefe5fd82001-04-03 13:02:48 +0000541 && (errno != ENOTCONN && errno != EINVAL))
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000542 error("channel %d: chan_shutdown_read: "
543 "shutdown() failed for fd%d [i%d o%d]: %.100s",
544 c->self, c->sock, c->istate, c->ostate,
545 strerror(errno));
Damien Miller33b13562000-04-04 14:38:59 +1000546 } else {
547 if (close(c->rfd) < 0)
Ben Lindstrom3b670d02001-06-09 00:57:39 +0000548 log("channel %d: chan_shutdown_read: "
549 "close() failed for fd%d: %.100s",
Damien Miller33b13562000-04-04 14:38:59 +1000550 c->self, c->rfd, strerror(errno));
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000551 c->rfd = -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000552 }
553}