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00146caa | 1 | /* $OpenBSD: nchan.c,v 1.56 2006/07/22 20:48:23 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 | ||
028094f4 | 31 | #include <errno.h> |
00146caa | 32 | #include <string.h> |
028094f4 | 33 | |
42f11eb2 | 34 | #include "ssh1.h" |
35 | #include "ssh2.h" | |
8efc0c15 | 36 | #include "buffer.h" |
37 | #include "packet.h" | |
38 | #include "channels.h" | |
7e7327a1 | 39 | #include "compat.h" |
42f11eb2 | 40 | #include "log.h" |
8efc0c15 | 41 | |
f048f3e2 | 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: | |
f2107e97 | 51 | * CLOSE -> |
52 | * <- CLOSE_CONFIRM | |
f048f3e2 | 53 | * |
54 | * 1.5: uses variations of: | |
f2107e97 | 55 | * IEOF -> |
56 | * <- OCLOSE | |
57 | * <- IEOF | |
58 | * OCLOSE -> | |
59 | * i.e. both sides have to close the channel | |
f048f3e2 | 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 | */ | |
1b73841d | 67 | |
7e7327a1 | 68 | /* functions manipulating channel states */ |
8efc0c15 | 69 | /* |
5260325f | 70 | * EVENTS update channel input/output states execute ACTIONS |
8efc0c15 | 71 | */ |
7e7327a1 | 72 | /* |
73 | * ACTIONS: should never update the channel states | |
74 | */ | |
396c147e | 75 | static void chan_send_ieof1(Channel *); |
76 | static void chan_send_oclose1(Channel *); | |
77 | static void chan_send_close2(Channel *); | |
78 | static void chan_send_eof2(Channel *); | |
7e7327a1 | 79 | |
7e7327a1 | 80 | /* helper */ |
396c147e | 81 | static void chan_shutdown_write(Channel *); |
82 | static void chan_shutdown_read(Channel *); | |
7e7327a1 | 83 | |
368e9dfc | 84 | static char *ostates[] = { "open", "drain", "wait_ieof", "closed" }; |
85 | static char *istates[] = { "open", "drain", "wait_oclose", "closed" }; | |
86 | ||
87 | static void | |
88 | chan_set_istate(Channel *c, u_int next) | |
89 | { | |
90 | if (c->istate > CHAN_INPUT_CLOSED || next > CHAN_INPUT_CLOSED) | |
91 | fatal("chan_set_istate: bad state %d -> %d", c->istate, next); | |
d7ac5f18 | 92 | debug2("channel %d: input %s -> %s", c->self, istates[c->istate], |
368e9dfc | 93 | istates[next]); |
94 | c->istate = next; | |
95 | } | |
96 | static void | |
97 | chan_set_ostate(Channel *c, u_int next) | |
98 | { | |
99 | if (c->ostate > CHAN_OUTPUT_CLOSED || next > CHAN_OUTPUT_CLOSED) | |
100 | fatal("chan_set_ostate: bad state %d -> %d", c->ostate, next); | |
d7ac5f18 | 101 | debug2("channel %d: output %s -> %s", c->self, ostates[c->ostate], |
368e9dfc | 102 | ostates[next]); |
103 | c->ostate = next; | |
104 | } | |
105 | ||
7e7327a1 | 106 | /* |
107 | * SSH1 specific implementation of event functions | |
108 | */ | |
109 | ||
110 | static void | |
111 | chan_rcvd_oclose1(Channel *c) | |
5260325f | 112 | { |
d7ac5f18 | 113 | debug2("channel %d: rcvd oclose", c->self); |
5260325f | 114 | switch (c->istate) { |
8efc0c15 | 115 | case CHAN_INPUT_WAIT_OCLOSE: |
368e9dfc | 116 | chan_set_istate(c, CHAN_INPUT_CLOSED); |
8efc0c15 | 117 | break; |
118 | case CHAN_INPUT_OPEN: | |
8efc0c15 | 119 | chan_shutdown_read(c); |
7e7327a1 | 120 | chan_send_ieof1(c); |
368e9dfc | 121 | chan_set_istate(c, CHAN_INPUT_CLOSED); |
48e671d5 | 122 | break; |
123 | case CHAN_INPUT_WAIT_DRAIN: | |
124 | /* both local read_failed and remote write_failed */ | |
7e7327a1 | 125 | chan_send_ieof1(c); |
368e9dfc | 126 | chan_set_istate(c, CHAN_INPUT_CLOSED); |
8efc0c15 | 127 | break; |
128 | default: | |
f048f3e2 | 129 | error("channel %d: protocol error: rcvd_oclose for istate %d", |
7e7327a1 | 130 | c->self, c->istate); |
48e671d5 | 131 | return; |
8efc0c15 | 132 | } |
133 | } | |
70bef40e | 134 | void |
135 | chan_read_failed(Channel *c) | |
5260325f | 136 | { |
d7ac5f18 | 137 | debug2("channel %d: read failed", c->self); |
5260325f | 138 | switch (c->istate) { |
8efc0c15 | 139 | case CHAN_INPUT_OPEN: |
8efc0c15 | 140 | chan_shutdown_read(c); |
368e9dfc | 141 | chan_set_istate(c, CHAN_INPUT_WAIT_DRAIN); |
8efc0c15 | 142 | break; |
143 | default: | |
f048f3e2 | 144 | error("channel %d: chan_read_failed for istate %d", |
7e7327a1 | 145 | c->self, c->istate); |
8efc0c15 | 146 | break; |
147 | } | |
148 | } | |
70bef40e | 149 | void |
150 | chan_ibuf_empty(Channel *c) | |
5260325f | 151 | { |
d7ac5f18 | 152 | debug2("channel %d: ibuf empty", c->self); |
5260325f | 153 | if (buffer_len(&c->input)) { |
f048f3e2 | 154 | error("channel %d: chan_ibuf_empty for non empty buffer", |
7e7327a1 | 155 | c->self); |
8efc0c15 | 156 | return; |
157 | } | |
5260325f | 158 | switch (c->istate) { |
8efc0c15 | 159 | case CHAN_INPUT_WAIT_DRAIN: |
3057c23b | 160 | if (compat20) { |
161 | if (!(c->flags & CHAN_CLOSE_SENT)) | |
162 | chan_send_eof2(c); | |
163 | chan_set_istate(c, CHAN_INPUT_CLOSED); | |
164 | } else { | |
165 | chan_send_ieof1(c); | |
166 | chan_set_istate(c, CHAN_INPUT_WAIT_OCLOSE); | |
167 | } | |
8efc0c15 | 168 | break; |
169 | default: | |
f048f3e2 | 170 | error("channel %d: chan_ibuf_empty for istate %d", |
7e7327a1 | 171 | c->self, c->istate); |
8efc0c15 | 172 | break; |
173 | } | |
174 | } | |
7e7327a1 | 175 | static void |
176 | chan_rcvd_ieof1(Channel *c) | |
5260325f | 177 | { |
d7ac5f18 | 178 | debug2("channel %d: rcvd ieof", c->self); |
5260325f | 179 | switch (c->ostate) { |
8efc0c15 | 180 | case CHAN_OUTPUT_OPEN: |
368e9dfc | 181 | chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN); |
8efc0c15 | 182 | break; |
183 | case CHAN_OUTPUT_WAIT_IEOF: | |
368e9dfc | 184 | chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
8efc0c15 | 185 | break; |
186 | default: | |
f048f3e2 | 187 | error("channel %d: protocol error: rcvd_ieof for ostate %d", |
7e7327a1 | 188 | c->self, c->ostate); |
8efc0c15 | 189 | break; |
190 | } | |
191 | } | |
7e7327a1 | 192 | static void |
193 | chan_write_failed1(Channel *c) | |
5260325f | 194 | { |
d7ac5f18 | 195 | debug2("channel %d: write failed", c->self); |
5260325f | 196 | switch (c->ostate) { |
8efc0c15 | 197 | case CHAN_OUTPUT_OPEN: |
1e5e896c | 198 | chan_shutdown_write(c); |
7e7327a1 | 199 | chan_send_oclose1(c); |
368e9dfc | 200 | chan_set_ostate(c, CHAN_OUTPUT_WAIT_IEOF); |
8efc0c15 | 201 | break; |
202 | case CHAN_OUTPUT_WAIT_DRAIN: | |
1e5e896c | 203 | chan_shutdown_write(c); |
7e7327a1 | 204 | chan_send_oclose1(c); |
368e9dfc | 205 | chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
8efc0c15 | 206 | break; |
207 | default: | |
f048f3e2 | 208 | error("channel %d: chan_write_failed for ostate %d", |
7e7327a1 | 209 | c->self, c->ostate); |
8efc0c15 | 210 | break; |
211 | } | |
212 | } | |
70bef40e | 213 | void |
214 | chan_obuf_empty(Channel *c) | |
5260325f | 215 | { |
d7ac5f18 | 216 | debug2("channel %d: obuf empty", c->self); |
5260325f | 217 | if (buffer_len(&c->output)) { |
f048f3e2 | 218 | error("channel %d: chan_obuf_empty for non empty buffer", |
7e7327a1 | 219 | c->self); |
8efc0c15 | 220 | return; |
221 | } | |
5260325f | 222 | switch (c->ostate) { |
8efc0c15 | 223 | case CHAN_OUTPUT_WAIT_DRAIN: |
1e5e896c | 224 | chan_shutdown_write(c); |
3057c23b | 225 | if (!compat20) |
226 | chan_send_oclose1(c); | |
368e9dfc | 227 | chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
8efc0c15 | 228 | break; |
229 | default: | |
f048f3e2 | 230 | error("channel %d: internal error: obuf_empty for ostate %d", |
7e7327a1 | 231 | c->self, c->ostate); |
8efc0c15 | 232 | break; |
233 | } | |
234 | } | |
8efc0c15 | 235 | static void |
7e7327a1 | 236 | chan_send_ieof1(Channel *c) |
5260325f | 237 | { |
d7ac5f18 | 238 | debug2("channel %d: send ieof", c->self); |
5260325f | 239 | switch (c->istate) { |
8efc0c15 | 240 | case CHAN_INPUT_OPEN: |
241 | case CHAN_INPUT_WAIT_DRAIN: | |
242 | packet_start(SSH_MSG_CHANNEL_INPUT_EOF); | |
243 | packet_put_int(c->remote_id); | |
244 | packet_send(); | |
245 | break; | |
246 | default: | |
f048f3e2 | 247 | error("channel %d: cannot send ieof for istate %d", |
7e7327a1 | 248 | c->self, c->istate); |
8efc0c15 | 249 | break; |
250 | } | |
251 | } | |
252 | static void | |
7e7327a1 | 253 | chan_send_oclose1(Channel *c) |
5260325f | 254 | { |
d7ac5f18 | 255 | debug2("channel %d: send oclose", c->self); |
5260325f | 256 | switch (c->ostate) { |
8efc0c15 | 257 | case CHAN_OUTPUT_OPEN: |
258 | case CHAN_OUTPUT_WAIT_DRAIN: | |
9c50edcf | 259 | buffer_clear(&c->output); |
8efc0c15 | 260 | packet_start(SSH_MSG_CHANNEL_OUTPUT_CLOSE); |
261 | packet_put_int(c->remote_id); | |
262 | packet_send(); | |
263 | break; | |
264 | default: | |
f048f3e2 | 265 | error("channel %d: cannot send oclose for ostate %d", |
184eed6a | 266 | c->self, c->ostate); |
8efc0c15 | 267 | break; |
268 | } | |
269 | } | |
5260325f | 270 | |
7e7327a1 | 271 | /* |
272 | * the same for SSH2 | |
273 | */ | |
8efc0c15 | 274 | static void |
668a91b7 | 275 | chan_rcvd_close2(Channel *c) |
5260325f | 276 | { |
d7ac5f18 | 277 | debug2("channel %d: rcvd close", c->self); |
7e7327a1 | 278 | if (c->flags & CHAN_CLOSE_RCVD) |
279 | error("channel %d: protocol error: close rcvd twice", c->self); | |
280 | c->flags |= CHAN_CLOSE_RCVD; | |
281 | if (c->type == SSH_CHANNEL_LARVAL) { | |
282 | /* tear down larval channels immediately */ | |
368e9dfc | 283 | chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
284 | chan_set_istate(c, CHAN_INPUT_CLOSED); | |
7e7327a1 | 285 | return; |
286 | } | |
287 | switch (c->ostate) { | |
288 | case CHAN_OUTPUT_OPEN: | |
f048f3e2 | 289 | /* |
290 | * wait until a data from the channel is consumed if a CLOSE | |
291 | * is received | |
292 | */ | |
368e9dfc | 293 | chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN); |
7e7327a1 | 294 | break; |
295 | } | |
296 | switch (c->istate) { | |
297 | case CHAN_INPUT_OPEN: | |
7e7327a1 | 298 | chan_shutdown_read(c); |
668a91b7 | 299 | chan_set_istate(c, CHAN_INPUT_CLOSED); |
7e7327a1 | 300 | break; |
301 | case CHAN_INPUT_WAIT_DRAIN: | |
7e7327a1 | 302 | chan_send_eof2(c); |
668a91b7 | 303 | chan_set_istate(c, CHAN_INPUT_CLOSED); |
7e7327a1 | 304 | break; |
305 | } | |
8efc0c15 | 306 | } |
307 | static void | |
668a91b7 | 308 | chan_rcvd_eof2(Channel *c) |
5260325f | 309 | { |
d7ac5f18 | 310 | debug2("channel %d: rcvd eof", c->self); |
d2296ed7 | 311 | c->flags |= CHAN_EOF_RCVD; |
368e9dfc | 312 | if (c->ostate == CHAN_OUTPUT_OPEN) |
313 | chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN); | |
8efc0c15 | 314 | } |
7e7327a1 | 315 | static void |
316 | chan_write_failed2(Channel *c) | |
317 | { | |
d7ac5f18 | 318 | debug2("channel %d: write failed", c->self); |
7e7327a1 | 319 | switch (c->ostate) { |
320 | case CHAN_OUTPUT_OPEN: | |
7e7327a1 | 321 | case CHAN_OUTPUT_WAIT_DRAIN: |
7e7327a1 | 322 | chan_shutdown_write(c); |
368e9dfc | 323 | chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
7e7327a1 | 324 | break; |
325 | default: | |
f048f3e2 | 326 | error("channel %d: chan_write_failed for ostate %d", |
7e7327a1 | 327 | c->self, c->ostate); |
328 | break; | |
329 | } | |
330 | } | |
331 | static void | |
7e7327a1 | 332 | chan_send_eof2(Channel *c) |
333 | { | |
d7ac5f18 | 334 | debug2("channel %d: send eof", c->self); |
7e7327a1 | 335 | switch (c->istate) { |
336 | case CHAN_INPUT_WAIT_DRAIN: | |
337 | packet_start(SSH2_MSG_CHANNEL_EOF); | |
338 | packet_put_int(c->remote_id); | |
339 | packet_send(); | |
d2296ed7 | 340 | c->flags |= CHAN_EOF_SENT; |
7e7327a1 | 341 | break; |
342 | default: | |
f048f3e2 | 343 | error("channel %d: cannot send eof for istate %d", |
7e7327a1 | 344 | c->self, c->istate); |
345 | break; | |
346 | } | |
347 | } | |
348 | static void | |
349 | chan_send_close2(Channel *c) | |
350 | { | |
d7ac5f18 | 351 | debug2("channel %d: send close", c->self); |
7e7327a1 | 352 | if (c->ostate != CHAN_OUTPUT_CLOSED || |
353 | c->istate != CHAN_INPUT_CLOSED) { | |
f048f3e2 | 354 | error("channel %d: cannot send close for istate/ostate %d/%d", |
7e7327a1 | 355 | c->self, c->istate, c->ostate); |
356 | } else if (c->flags & CHAN_CLOSE_SENT) { | |
f048f3e2 | 357 | error("channel %d: already sent close", c->self); |
7e7327a1 | 358 | } else { |
359 | packet_start(SSH2_MSG_CHANNEL_CLOSE); | |
360 | packet_put_int(c->remote_id); | |
361 | packet_send(); | |
362 | c->flags |= CHAN_CLOSE_SENT; | |
363 | } | |
364 | } | |
ee55dacf | 365 | |
366 | /* shared */ | |
367 | ||
70bef40e | 368 | void |
369 | chan_rcvd_ieof(Channel *c) | |
370 | { | |
371 | if (compat20) | |
372 | chan_rcvd_eof2(c); | |
373 | else | |
374 | chan_rcvd_ieof1(c); | |
32e7d71f | 375 | if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN && |
7203d6bb | 376 | buffer_len(&c->output) == 0 && |
d2296ed7 | 377 | !CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
32e7d71f | 378 | chan_obuf_empty(c); |
70bef40e | 379 | } |
380 | void | |
381 | chan_rcvd_oclose(Channel *c) | |
382 | { | |
383 | if (compat20) | |
384 | chan_rcvd_close2(c); | |
385 | else | |
386 | chan_rcvd_oclose1(c); | |
387 | } | |
388 | void | |
389 | chan_write_failed(Channel *c) | |
390 | { | |
391 | if (compat20) | |
392 | chan_write_failed2(c); | |
393 | else | |
394 | chan_write_failed1(c); | |
395 | } | |
396 | ||
719fc62f | 397 | void |
398 | chan_mark_dead(Channel *c) | |
399 | { | |
6fd8622b | 400 | c->type = SSH_CHANNEL_ZOMBIE; |
719fc62f | 401 | } |
402 | ||
ee55dacf | 403 | int |
ca75d7de | 404 | chan_is_dead(Channel *c, int do_send) |
5260325f | 405 | { |
6fd8622b | 406 | if (c->type == SSH_CHANNEL_ZOMBIE) { |
d7ac5f18 | 407 | debug2("channel %d: zombie", c->self); |
719fc62f | 408 | return 1; |
6fd8622b | 409 | } |
ee55dacf | 410 | if (c->istate != CHAN_INPUT_CLOSED || c->ostate != CHAN_OUTPUT_CLOSED) |
411 | return 0; | |
412 | if (!compat20) { | |
d7ac5f18 | 413 | debug2("channel %d: is dead", c->self); |
ee55dacf | 414 | return 1; |
415 | } | |
d2296ed7 | 416 | if ((datafellows & SSH_BUG_EXTEOF) && |
417 | c->extended_usage == CHAN_EXTENDED_WRITE && | |
418 | c->efd != -1 && | |
419 | buffer_len(&c->extended) > 0) { | |
875ec275 | 420 | debug2("channel %d: active efd: %d len %d", |
421 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 422 | return 0; |
423 | } | |
424 | if (!(c->flags & CHAN_CLOSE_SENT)) { | |
ca75d7de | 425 | if (do_send) { |
d2296ed7 | 426 | chan_send_close2(c); |
427 | } else { | |
428 | /* channel would be dead if we sent a close */ | |
429 | if (c->flags & CHAN_CLOSE_RCVD) { | |
d7ac5f18 | 430 | debug2("channel %d: almost dead", |
d2296ed7 | 431 | c->self); |
432 | return 1; | |
418e724c | 433 | } |
7e7327a1 | 434 | } |
d2296ed7 | 435 | } |
436 | if ((c->flags & CHAN_CLOSE_SENT) && | |
437 | (c->flags & CHAN_CLOSE_RCVD)) { | |
d7ac5f18 | 438 | debug2("channel %d: is dead", c->self); |
d2296ed7 | 439 | return 1; |
8efc0c15 | 440 | } |
ee55dacf | 441 | return 0; |
8efc0c15 | 442 | } |
7e7327a1 | 443 | |
7e7327a1 | 444 | /* helper */ |
445 | static void | |
446 | chan_shutdown_write(Channel *c) | |
447 | { | |
9c50edcf | 448 | buffer_clear(&c->output); |
7e7327a1 | 449 | if (compat20 && c->type == SSH_CHANNEL_LARVAL) |
450 | return; | |
451 | /* shutdown failure is allowed if write failed already */ | |
d7ac5f18 | 452 | debug2("channel %d: close_write", c->self); |
7e7327a1 | 453 | if (c->sock != -1) { |
454 | if (shutdown(c->sock, SHUT_WR) < 0) | |
d7ac5f18 | 455 | debug2("channel %d: chan_shutdown_write: " |
f048f3e2 | 456 | "shutdown() failed for fd%d: %.100s", |
7e7327a1 | 457 | c->self, c->sock, strerror(errno)); |
458 | } else { | |
489aa2e9 | 459 | if (channel_close_fd(&c->wfd) < 0) |
bbe88b6d | 460 | logit("channel %d: chan_shutdown_write: " |
f048f3e2 | 461 | "close() failed for fd%d: %.100s", |
7e7327a1 | 462 | c->self, c->wfd, strerror(errno)); |
7e7327a1 | 463 | } |
464 | } | |
465 | static void | |
466 | chan_shutdown_read(Channel *c) | |
467 | { | |
468 | if (compat20 && c->type == SSH_CHANNEL_LARVAL) | |
469 | return; | |
d7ac5f18 | 470 | debug2("channel %d: close_read", c->self); |
7e7327a1 | 471 | if (c->sock != -1) { |
2b87da3b | 472 | /* |
47670e77 | 473 | * shutdown(sock, SHUT_READ) may return ENOTCONN if the |
474 | * write side has been closed already. (bug on Linux) | |
f49df8e9 | 475 | * HP-UX may return ENOTCONN also. |
47670e77 | 476 | */ |
477 | if (shutdown(c->sock, SHUT_RD) < 0 | |
f49df8e9 | 478 | && errno != ENOTCONN) |
f048f3e2 | 479 | error("channel %d: chan_shutdown_read: " |
480 | "shutdown() failed for fd%d [i%d o%d]: %.100s", | |
481 | c->self, c->sock, c->istate, c->ostate, | |
1b73841d | 482 | strerror(errno)); |
7e7327a1 | 483 | } else { |
489aa2e9 | 484 | if (channel_close_fd(&c->rfd) < 0) |
bbe88b6d | 485 | logit("channel %d: chan_shutdown_read: " |
f048f3e2 | 486 | "close() failed for fd%d: %.100s", |
7e7327a1 | 487 | c->self, c->rfd, strerror(errno)); |
7e7327a1 | 488 | } |
8efc0c15 | 489 | } |