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5b04a8bf | 1 | /* $OpenBSD: nchan.c,v 1.54 2006/07/08 21:47:12 stevesk Exp $ */ |
aa3378df | 2 | /* |
8ab5f6b2 | 3 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
aa3378df | 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. | |
aa3378df | 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 | ||
8efc0c15 | 26 | #include "includes.h" |
8efc0c15 | 27 | |
5b04a8bf | 28 | #include <sys/types.h> |
29 | #include <sys/socket.h> | |
30 | ||
42f11eb2 | 31 | #include "ssh1.h" |
32 | #include "ssh2.h" | |
8efc0c15 | 33 | #include "buffer.h" |
34 | #include "packet.h" | |
35 | #include "channels.h" | |
7e7327a1 | 36 | #include "compat.h" |
42f11eb2 | 37 | #include "log.h" |
8efc0c15 | 38 | |
f048f3e2 | 39 | /* |
40 | * SSH Protocol 1.5 aka New Channel Protocol | |
41 | * Thanks to Martina, Axel and everyone who left Erlangen, leaving me bored. | |
42 | * Written by Markus Friedl in October 1999 | |
43 | * | |
44 | * Protocol versions 1.3 and 1.5 differ in the handshake protocol used for the | |
45 | * tear down of channels: | |
46 | * | |
47 | * 1.3: strict request-ack-protocol: | |
f2107e97 | 48 | * CLOSE -> |
49 | * <- CLOSE_CONFIRM | |
f048f3e2 | 50 | * |
51 | * 1.5: uses variations of: | |
f2107e97 | 52 | * IEOF -> |
53 | * <- OCLOSE | |
54 | * <- IEOF | |
55 | * OCLOSE -> | |
56 | * i.e. both sides have to close the channel | |
f048f3e2 | 57 | * |
58 | * 2.0: the EOF messages are optional | |
59 | * | |
60 | * See the debugging output from 'ssh -v' and 'sshd -d' of | |
61 | * ssh-1.2.27 as an example. | |
62 | * | |
63 | */ | |
1b73841d | 64 | |
7e7327a1 | 65 | /* functions manipulating channel states */ |
8efc0c15 | 66 | /* |
5260325f | 67 | * EVENTS update channel input/output states execute ACTIONS |
8efc0c15 | 68 | */ |
7e7327a1 | 69 | /* |
70 | * ACTIONS: should never update the channel states | |
71 | */ | |
396c147e | 72 | static void chan_send_ieof1(Channel *); |
73 | static void chan_send_oclose1(Channel *); | |
74 | static void chan_send_close2(Channel *); | |
75 | static void chan_send_eof2(Channel *); | |
7e7327a1 | 76 | |
7e7327a1 | 77 | /* helper */ |
396c147e | 78 | static void chan_shutdown_write(Channel *); |
79 | static void chan_shutdown_read(Channel *); | |
7e7327a1 | 80 | |
368e9dfc | 81 | static char *ostates[] = { "open", "drain", "wait_ieof", "closed" }; |
82 | static char *istates[] = { "open", "drain", "wait_oclose", "closed" }; | |
83 | ||
84 | static void | |
85 | chan_set_istate(Channel *c, u_int next) | |
86 | { | |
87 | if (c->istate > CHAN_INPUT_CLOSED || next > CHAN_INPUT_CLOSED) | |
88 | fatal("chan_set_istate: bad state %d -> %d", c->istate, next); | |
d7ac5f18 | 89 | debug2("channel %d: input %s -> %s", c->self, istates[c->istate], |
368e9dfc | 90 | istates[next]); |
91 | c->istate = next; | |
92 | } | |
93 | static void | |
94 | chan_set_ostate(Channel *c, u_int next) | |
95 | { | |
96 | if (c->ostate > CHAN_OUTPUT_CLOSED || next > CHAN_OUTPUT_CLOSED) | |
97 | fatal("chan_set_ostate: bad state %d -> %d", c->ostate, next); | |
d7ac5f18 | 98 | debug2("channel %d: output %s -> %s", c->self, ostates[c->ostate], |
368e9dfc | 99 | ostates[next]); |
100 | c->ostate = next; | |
101 | } | |
102 | ||
7e7327a1 | 103 | /* |
104 | * SSH1 specific implementation of event functions | |
105 | */ | |
106 | ||
107 | static void | |
108 | chan_rcvd_oclose1(Channel *c) | |
5260325f | 109 | { |
d7ac5f18 | 110 | debug2("channel %d: rcvd oclose", c->self); |
5260325f | 111 | switch (c->istate) { |
8efc0c15 | 112 | case CHAN_INPUT_WAIT_OCLOSE: |
368e9dfc | 113 | chan_set_istate(c, CHAN_INPUT_CLOSED); |
8efc0c15 | 114 | break; |
115 | case CHAN_INPUT_OPEN: | |
8efc0c15 | 116 | chan_shutdown_read(c); |
7e7327a1 | 117 | chan_send_ieof1(c); |
368e9dfc | 118 | chan_set_istate(c, CHAN_INPUT_CLOSED); |
48e671d5 | 119 | break; |
120 | case CHAN_INPUT_WAIT_DRAIN: | |
121 | /* both local read_failed and remote write_failed */ | |
7e7327a1 | 122 | chan_send_ieof1(c); |
368e9dfc | 123 | chan_set_istate(c, CHAN_INPUT_CLOSED); |
8efc0c15 | 124 | break; |
125 | default: | |
f048f3e2 | 126 | error("channel %d: protocol error: rcvd_oclose for istate %d", |
7e7327a1 | 127 | c->self, c->istate); |
48e671d5 | 128 | return; |
8efc0c15 | 129 | } |
130 | } | |
70bef40e | 131 | void |
132 | chan_read_failed(Channel *c) | |
5260325f | 133 | { |
d7ac5f18 | 134 | debug2("channel %d: read failed", c->self); |
5260325f | 135 | switch (c->istate) { |
8efc0c15 | 136 | case CHAN_INPUT_OPEN: |
8efc0c15 | 137 | chan_shutdown_read(c); |
368e9dfc | 138 | chan_set_istate(c, CHAN_INPUT_WAIT_DRAIN); |
8efc0c15 | 139 | break; |
140 | default: | |
f048f3e2 | 141 | error("channel %d: chan_read_failed for istate %d", |
7e7327a1 | 142 | c->self, c->istate); |
8efc0c15 | 143 | break; |
144 | } | |
145 | } | |
70bef40e | 146 | void |
147 | chan_ibuf_empty(Channel *c) | |
5260325f | 148 | { |
d7ac5f18 | 149 | debug2("channel %d: ibuf empty", c->self); |
5260325f | 150 | if (buffer_len(&c->input)) { |
f048f3e2 | 151 | error("channel %d: chan_ibuf_empty for non empty buffer", |
7e7327a1 | 152 | c->self); |
8efc0c15 | 153 | return; |
154 | } | |
5260325f | 155 | switch (c->istate) { |
8efc0c15 | 156 | case CHAN_INPUT_WAIT_DRAIN: |
3057c23b | 157 | if (compat20) { |
158 | if (!(c->flags & CHAN_CLOSE_SENT)) | |
159 | chan_send_eof2(c); | |
160 | chan_set_istate(c, CHAN_INPUT_CLOSED); | |
161 | } else { | |
162 | chan_send_ieof1(c); | |
163 | chan_set_istate(c, CHAN_INPUT_WAIT_OCLOSE); | |
164 | } | |
8efc0c15 | 165 | break; |
166 | default: | |
f048f3e2 | 167 | error("channel %d: chan_ibuf_empty for istate %d", |
7e7327a1 | 168 | c->self, c->istate); |
8efc0c15 | 169 | break; |
170 | } | |
171 | } | |
7e7327a1 | 172 | static void |
173 | chan_rcvd_ieof1(Channel *c) | |
5260325f | 174 | { |
d7ac5f18 | 175 | debug2("channel %d: rcvd ieof", c->self); |
5260325f | 176 | switch (c->ostate) { |
8efc0c15 | 177 | case CHAN_OUTPUT_OPEN: |
368e9dfc | 178 | chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN); |
8efc0c15 | 179 | break; |
180 | case CHAN_OUTPUT_WAIT_IEOF: | |
368e9dfc | 181 | chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
8efc0c15 | 182 | break; |
183 | default: | |
f048f3e2 | 184 | error("channel %d: protocol error: rcvd_ieof for ostate %d", |
7e7327a1 | 185 | c->self, c->ostate); |
8efc0c15 | 186 | break; |
187 | } | |
188 | } | |
7e7327a1 | 189 | static void |
190 | chan_write_failed1(Channel *c) | |
5260325f | 191 | { |
d7ac5f18 | 192 | debug2("channel %d: write failed", c->self); |
5260325f | 193 | switch (c->ostate) { |
8efc0c15 | 194 | case CHAN_OUTPUT_OPEN: |
1e5e896c | 195 | chan_shutdown_write(c); |
7e7327a1 | 196 | chan_send_oclose1(c); |
368e9dfc | 197 | chan_set_ostate(c, CHAN_OUTPUT_WAIT_IEOF); |
8efc0c15 | 198 | break; |
199 | case CHAN_OUTPUT_WAIT_DRAIN: | |
1e5e896c | 200 | chan_shutdown_write(c); |
7e7327a1 | 201 | chan_send_oclose1(c); |
368e9dfc | 202 | chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
8efc0c15 | 203 | break; |
204 | default: | |
f048f3e2 | 205 | error("channel %d: chan_write_failed for ostate %d", |
7e7327a1 | 206 | c->self, c->ostate); |
8efc0c15 | 207 | break; |
208 | } | |
209 | } | |
70bef40e | 210 | void |
211 | chan_obuf_empty(Channel *c) | |
5260325f | 212 | { |
d7ac5f18 | 213 | debug2("channel %d: obuf empty", c->self); |
5260325f | 214 | if (buffer_len(&c->output)) { |
f048f3e2 | 215 | error("channel %d: chan_obuf_empty for non empty buffer", |
7e7327a1 | 216 | c->self); |
8efc0c15 | 217 | return; |
218 | } | |
5260325f | 219 | switch (c->ostate) { |
8efc0c15 | 220 | case CHAN_OUTPUT_WAIT_DRAIN: |
1e5e896c | 221 | chan_shutdown_write(c); |
3057c23b | 222 | if (!compat20) |
223 | chan_send_oclose1(c); | |
368e9dfc | 224 | chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
8efc0c15 | 225 | break; |
226 | default: | |
f048f3e2 | 227 | error("channel %d: internal error: obuf_empty for ostate %d", |
7e7327a1 | 228 | c->self, c->ostate); |
8efc0c15 | 229 | break; |
230 | } | |
231 | } | |
8efc0c15 | 232 | static void |
7e7327a1 | 233 | chan_send_ieof1(Channel *c) |
5260325f | 234 | { |
d7ac5f18 | 235 | debug2("channel %d: send ieof", c->self); |
5260325f | 236 | switch (c->istate) { |
8efc0c15 | 237 | case CHAN_INPUT_OPEN: |
238 | case CHAN_INPUT_WAIT_DRAIN: | |
239 | packet_start(SSH_MSG_CHANNEL_INPUT_EOF); | |
240 | packet_put_int(c->remote_id); | |
241 | packet_send(); | |
242 | break; | |
243 | default: | |
f048f3e2 | 244 | error("channel %d: cannot send ieof for istate %d", |
7e7327a1 | 245 | c->self, c->istate); |
8efc0c15 | 246 | break; |
247 | } | |
248 | } | |
249 | static void | |
7e7327a1 | 250 | chan_send_oclose1(Channel *c) |
5260325f | 251 | { |
d7ac5f18 | 252 | debug2("channel %d: send oclose", c->self); |
5260325f | 253 | switch (c->ostate) { |
8efc0c15 | 254 | case CHAN_OUTPUT_OPEN: |
255 | case CHAN_OUTPUT_WAIT_DRAIN: | |
9c50edcf | 256 | buffer_clear(&c->output); |
8efc0c15 | 257 | packet_start(SSH_MSG_CHANNEL_OUTPUT_CLOSE); |
258 | packet_put_int(c->remote_id); | |
259 | packet_send(); | |
260 | break; | |
261 | default: | |
f048f3e2 | 262 | error("channel %d: cannot send oclose for ostate %d", |
184eed6a | 263 | c->self, c->ostate); |
8efc0c15 | 264 | break; |
265 | } | |
266 | } | |
5260325f | 267 | |
7e7327a1 | 268 | /* |
269 | * the same for SSH2 | |
270 | */ | |
8efc0c15 | 271 | static void |
668a91b7 | 272 | chan_rcvd_close2(Channel *c) |
5260325f | 273 | { |
d7ac5f18 | 274 | debug2("channel %d: rcvd close", c->self); |
7e7327a1 | 275 | if (c->flags & CHAN_CLOSE_RCVD) |
276 | error("channel %d: protocol error: close rcvd twice", c->self); | |
277 | c->flags |= CHAN_CLOSE_RCVD; | |
278 | if (c->type == SSH_CHANNEL_LARVAL) { | |
279 | /* tear down larval channels immediately */ | |
368e9dfc | 280 | chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
281 | chan_set_istate(c, CHAN_INPUT_CLOSED); | |
7e7327a1 | 282 | return; |
283 | } | |
284 | switch (c->ostate) { | |
285 | case CHAN_OUTPUT_OPEN: | |
f048f3e2 | 286 | /* |
287 | * wait until a data from the channel is consumed if a CLOSE | |
288 | * is received | |
289 | */ | |
368e9dfc | 290 | chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN); |
7e7327a1 | 291 | break; |
292 | } | |
293 | switch (c->istate) { | |
294 | case CHAN_INPUT_OPEN: | |
7e7327a1 | 295 | chan_shutdown_read(c); |
668a91b7 | 296 | chan_set_istate(c, CHAN_INPUT_CLOSED); |
7e7327a1 | 297 | break; |
298 | case CHAN_INPUT_WAIT_DRAIN: | |
7e7327a1 | 299 | chan_send_eof2(c); |
668a91b7 | 300 | chan_set_istate(c, CHAN_INPUT_CLOSED); |
7e7327a1 | 301 | break; |
302 | } | |
8efc0c15 | 303 | } |
304 | static void | |
668a91b7 | 305 | chan_rcvd_eof2(Channel *c) |
5260325f | 306 | { |
d7ac5f18 | 307 | debug2("channel %d: rcvd eof", c->self); |
d2296ed7 | 308 | c->flags |= CHAN_EOF_RCVD; |
368e9dfc | 309 | if (c->ostate == CHAN_OUTPUT_OPEN) |
310 | chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN); | |
8efc0c15 | 311 | } |
7e7327a1 | 312 | static void |
313 | chan_write_failed2(Channel *c) | |
314 | { | |
d7ac5f18 | 315 | debug2("channel %d: write failed", c->self); |
7e7327a1 | 316 | switch (c->ostate) { |
317 | case CHAN_OUTPUT_OPEN: | |
7e7327a1 | 318 | case CHAN_OUTPUT_WAIT_DRAIN: |
7e7327a1 | 319 | chan_shutdown_write(c); |
368e9dfc | 320 | chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
7e7327a1 | 321 | break; |
322 | default: | |
f048f3e2 | 323 | error("channel %d: chan_write_failed for ostate %d", |
7e7327a1 | 324 | c->self, c->ostate); |
325 | break; | |
326 | } | |
327 | } | |
328 | static void | |
7e7327a1 | 329 | chan_send_eof2(Channel *c) |
330 | { | |
d7ac5f18 | 331 | debug2("channel %d: send eof", c->self); |
7e7327a1 | 332 | switch (c->istate) { |
333 | case CHAN_INPUT_WAIT_DRAIN: | |
334 | packet_start(SSH2_MSG_CHANNEL_EOF); | |
335 | packet_put_int(c->remote_id); | |
336 | packet_send(); | |
d2296ed7 | 337 | c->flags |= CHAN_EOF_SENT; |
7e7327a1 | 338 | break; |
339 | default: | |
f048f3e2 | 340 | error("channel %d: cannot send eof for istate %d", |
7e7327a1 | 341 | c->self, c->istate); |
342 | break; | |
343 | } | |
344 | } | |
345 | static void | |
346 | chan_send_close2(Channel *c) | |
347 | { | |
d7ac5f18 | 348 | debug2("channel %d: send close", c->self); |
7e7327a1 | 349 | if (c->ostate != CHAN_OUTPUT_CLOSED || |
350 | c->istate != CHAN_INPUT_CLOSED) { | |
f048f3e2 | 351 | error("channel %d: cannot send close for istate/ostate %d/%d", |
7e7327a1 | 352 | c->self, c->istate, c->ostate); |
353 | } else if (c->flags & CHAN_CLOSE_SENT) { | |
f048f3e2 | 354 | error("channel %d: already sent close", c->self); |
7e7327a1 | 355 | } else { |
356 | packet_start(SSH2_MSG_CHANNEL_CLOSE); | |
357 | packet_put_int(c->remote_id); | |
358 | packet_send(); | |
359 | c->flags |= CHAN_CLOSE_SENT; | |
360 | } | |
361 | } | |
ee55dacf | 362 | |
363 | /* shared */ | |
364 | ||
70bef40e | 365 | void |
366 | chan_rcvd_ieof(Channel *c) | |
367 | { | |
368 | if (compat20) | |
369 | chan_rcvd_eof2(c); | |
370 | else | |
371 | chan_rcvd_ieof1(c); | |
32e7d71f | 372 | if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN && |
7203d6bb | 373 | buffer_len(&c->output) == 0 && |
d2296ed7 | 374 | !CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
32e7d71f | 375 | chan_obuf_empty(c); |
70bef40e | 376 | } |
377 | void | |
378 | chan_rcvd_oclose(Channel *c) | |
379 | { | |
380 | if (compat20) | |
381 | chan_rcvd_close2(c); | |
382 | else | |
383 | chan_rcvd_oclose1(c); | |
384 | } | |
385 | void | |
386 | chan_write_failed(Channel *c) | |
387 | { | |
388 | if (compat20) | |
389 | chan_write_failed2(c); | |
390 | else | |
391 | chan_write_failed1(c); | |
392 | } | |
393 | ||
719fc62f | 394 | void |
395 | chan_mark_dead(Channel *c) | |
396 | { | |
6fd8622b | 397 | c->type = SSH_CHANNEL_ZOMBIE; |
719fc62f | 398 | } |
399 | ||
ee55dacf | 400 | int |
ca75d7de | 401 | chan_is_dead(Channel *c, int do_send) |
5260325f | 402 | { |
6fd8622b | 403 | if (c->type == SSH_CHANNEL_ZOMBIE) { |
d7ac5f18 | 404 | debug2("channel %d: zombie", c->self); |
719fc62f | 405 | return 1; |
6fd8622b | 406 | } |
ee55dacf | 407 | if (c->istate != CHAN_INPUT_CLOSED || c->ostate != CHAN_OUTPUT_CLOSED) |
408 | return 0; | |
409 | if (!compat20) { | |
d7ac5f18 | 410 | debug2("channel %d: is dead", c->self); |
ee55dacf | 411 | return 1; |
412 | } | |
d2296ed7 | 413 | if ((datafellows & SSH_BUG_EXTEOF) && |
414 | c->extended_usage == CHAN_EXTENDED_WRITE && | |
415 | c->efd != -1 && | |
416 | buffer_len(&c->extended) > 0) { | |
875ec275 | 417 | debug2("channel %d: active efd: %d len %d", |
418 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 419 | return 0; |
420 | } | |
421 | if (!(c->flags & CHAN_CLOSE_SENT)) { | |
ca75d7de | 422 | if (do_send) { |
d2296ed7 | 423 | chan_send_close2(c); |
424 | } else { | |
425 | /* channel would be dead if we sent a close */ | |
426 | if (c->flags & CHAN_CLOSE_RCVD) { | |
d7ac5f18 | 427 | debug2("channel %d: almost dead", |
d2296ed7 | 428 | c->self); |
429 | return 1; | |
418e724c | 430 | } |
7e7327a1 | 431 | } |
d2296ed7 | 432 | } |
433 | if ((c->flags & CHAN_CLOSE_SENT) && | |
434 | (c->flags & CHAN_CLOSE_RCVD)) { | |
d7ac5f18 | 435 | debug2("channel %d: is dead", c->self); |
d2296ed7 | 436 | return 1; |
8efc0c15 | 437 | } |
ee55dacf | 438 | return 0; |
8efc0c15 | 439 | } |
7e7327a1 | 440 | |
7e7327a1 | 441 | /* helper */ |
442 | static void | |
443 | chan_shutdown_write(Channel *c) | |
444 | { | |
9c50edcf | 445 | buffer_clear(&c->output); |
7e7327a1 | 446 | if (compat20 && c->type == SSH_CHANNEL_LARVAL) |
447 | return; | |
448 | /* shutdown failure is allowed if write failed already */ | |
d7ac5f18 | 449 | debug2("channel %d: close_write", c->self); |
7e7327a1 | 450 | if (c->sock != -1) { |
451 | if (shutdown(c->sock, SHUT_WR) < 0) | |
d7ac5f18 | 452 | debug2("channel %d: chan_shutdown_write: " |
f048f3e2 | 453 | "shutdown() failed for fd%d: %.100s", |
7e7327a1 | 454 | c->self, c->sock, strerror(errno)); |
455 | } else { | |
489aa2e9 | 456 | if (channel_close_fd(&c->wfd) < 0) |
bbe88b6d | 457 | logit("channel %d: chan_shutdown_write: " |
f048f3e2 | 458 | "close() failed for fd%d: %.100s", |
7e7327a1 | 459 | c->self, c->wfd, strerror(errno)); |
7e7327a1 | 460 | } |
461 | } | |
462 | static void | |
463 | chan_shutdown_read(Channel *c) | |
464 | { | |
465 | if (compat20 && c->type == SSH_CHANNEL_LARVAL) | |
466 | return; | |
d7ac5f18 | 467 | debug2("channel %d: close_read", c->self); |
7e7327a1 | 468 | if (c->sock != -1) { |
2b87da3b | 469 | /* |
47670e77 | 470 | * shutdown(sock, SHUT_READ) may return ENOTCONN if the |
471 | * write side has been closed already. (bug on Linux) | |
f49df8e9 | 472 | * HP-UX may return ENOTCONN also. |
47670e77 | 473 | */ |
474 | if (shutdown(c->sock, SHUT_RD) < 0 | |
f49df8e9 | 475 | && errno != ENOTCONN) |
f048f3e2 | 476 | error("channel %d: chan_shutdown_read: " |
477 | "shutdown() failed for fd%d [i%d o%d]: %.100s", | |
478 | c->self, c->sock, c->istate, c->ostate, | |
1b73841d | 479 | strerror(errno)); |
7e7327a1 | 480 | } else { |
489aa2e9 | 481 | if (channel_close_fd(&c->rfd) < 0) |
bbe88b6d | 482 | logit("channel %d: chan_shutdown_read: " |
f048f3e2 | 483 | "close() failed for fd%d: %.100s", |
7e7327a1 | 484 | c->self, c->rfd, strerror(errno)); |
7e7327a1 | 485 | } |
8efc0c15 | 486 | } |