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31652869 | 1 | /* $OpenBSD: nchan.c,v 1.57 2006/08/03 03:34:42 deraadt 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> |
31652869 | 33 | #include <stdarg.h> |
028094f4 | 34 | |
42f11eb2 | 35 | #include "ssh1.h" |
36 | #include "ssh2.h" | |
8efc0c15 | 37 | #include "buffer.h" |
38 | #include "packet.h" | |
39 | #include "channels.h" | |
7e7327a1 | 40 | #include "compat.h" |
42f11eb2 | 41 | #include "log.h" |
8efc0c15 | 42 | |
f048f3e2 | 43 | /* |
44 | * SSH Protocol 1.5 aka New Channel Protocol | |
45 | * Thanks to Martina, Axel and everyone who left Erlangen, leaving me bored. | |
46 | * Written by Markus Friedl in October 1999 | |
47 | * | |
48 | * Protocol versions 1.3 and 1.5 differ in the handshake protocol used for the | |
49 | * tear down of channels: | |
50 | * | |
51 | * 1.3: strict request-ack-protocol: | |
f2107e97 | 52 | * CLOSE -> |
53 | * <- CLOSE_CONFIRM | |
f048f3e2 | 54 | * |
55 | * 1.5: uses variations of: | |
f2107e97 | 56 | * IEOF -> |
57 | * <- OCLOSE | |
58 | * <- IEOF | |
59 | * OCLOSE -> | |
60 | * i.e. both sides have to close the channel | |
f048f3e2 | 61 | * |
62 | * 2.0: the EOF messages are optional | |
63 | * | |
64 | * See the debugging output from 'ssh -v' and 'sshd -d' of | |
65 | * ssh-1.2.27 as an example. | |
66 | * | |
67 | */ | |
1b73841d | 68 | |
7e7327a1 | 69 | /* functions manipulating channel states */ |
8efc0c15 | 70 | /* |
5260325f | 71 | * EVENTS update channel input/output states execute ACTIONS |
8efc0c15 | 72 | */ |
7e7327a1 | 73 | /* |
74 | * ACTIONS: should never update the channel states | |
75 | */ | |
396c147e | 76 | static void chan_send_ieof1(Channel *); |
77 | static void chan_send_oclose1(Channel *); | |
78 | static void chan_send_close2(Channel *); | |
79 | static void chan_send_eof2(Channel *); | |
7e7327a1 | 80 | |
7e7327a1 | 81 | /* helper */ |
396c147e | 82 | static void chan_shutdown_write(Channel *); |
83 | static void chan_shutdown_read(Channel *); | |
7e7327a1 | 84 | |
368e9dfc | 85 | static char *ostates[] = { "open", "drain", "wait_ieof", "closed" }; |
86 | static char *istates[] = { "open", "drain", "wait_oclose", "closed" }; | |
87 | ||
88 | static void | |
89 | chan_set_istate(Channel *c, u_int next) | |
90 | { | |
91 | if (c->istate > CHAN_INPUT_CLOSED || next > CHAN_INPUT_CLOSED) | |
92 | fatal("chan_set_istate: bad state %d -> %d", c->istate, next); | |
d7ac5f18 | 93 | debug2("channel %d: input %s -> %s", c->self, istates[c->istate], |
368e9dfc | 94 | istates[next]); |
95 | c->istate = next; | |
96 | } | |
97 | static void | |
98 | chan_set_ostate(Channel *c, u_int next) | |
99 | { | |
100 | if (c->ostate > CHAN_OUTPUT_CLOSED || next > CHAN_OUTPUT_CLOSED) | |
101 | fatal("chan_set_ostate: bad state %d -> %d", c->ostate, next); | |
d7ac5f18 | 102 | debug2("channel %d: output %s -> %s", c->self, ostates[c->ostate], |
368e9dfc | 103 | ostates[next]); |
104 | c->ostate = next; | |
105 | } | |
106 | ||
7e7327a1 | 107 | /* |
108 | * SSH1 specific implementation of event functions | |
109 | */ | |
110 | ||
111 | static void | |
112 | chan_rcvd_oclose1(Channel *c) | |
5260325f | 113 | { |
d7ac5f18 | 114 | debug2("channel %d: rcvd oclose", c->self); |
5260325f | 115 | switch (c->istate) { |
8efc0c15 | 116 | case CHAN_INPUT_WAIT_OCLOSE: |
368e9dfc | 117 | chan_set_istate(c, CHAN_INPUT_CLOSED); |
8efc0c15 | 118 | break; |
119 | case CHAN_INPUT_OPEN: | |
8efc0c15 | 120 | chan_shutdown_read(c); |
7e7327a1 | 121 | chan_send_ieof1(c); |
368e9dfc | 122 | chan_set_istate(c, CHAN_INPUT_CLOSED); |
48e671d5 | 123 | break; |
124 | case CHAN_INPUT_WAIT_DRAIN: | |
125 | /* both local read_failed and remote write_failed */ | |
7e7327a1 | 126 | chan_send_ieof1(c); |
368e9dfc | 127 | chan_set_istate(c, CHAN_INPUT_CLOSED); |
8efc0c15 | 128 | break; |
129 | default: | |
f048f3e2 | 130 | error("channel %d: protocol error: rcvd_oclose for istate %d", |
7e7327a1 | 131 | c->self, c->istate); |
48e671d5 | 132 | return; |
8efc0c15 | 133 | } |
134 | } | |
70bef40e | 135 | void |
136 | chan_read_failed(Channel *c) | |
5260325f | 137 | { |
d7ac5f18 | 138 | debug2("channel %d: read failed", c->self); |
5260325f | 139 | switch (c->istate) { |
8efc0c15 | 140 | case CHAN_INPUT_OPEN: |
8efc0c15 | 141 | chan_shutdown_read(c); |
368e9dfc | 142 | chan_set_istate(c, CHAN_INPUT_WAIT_DRAIN); |
8efc0c15 | 143 | break; |
144 | default: | |
f048f3e2 | 145 | error("channel %d: chan_read_failed for istate %d", |
7e7327a1 | 146 | c->self, c->istate); |
8efc0c15 | 147 | break; |
148 | } | |
149 | } | |
70bef40e | 150 | void |
151 | chan_ibuf_empty(Channel *c) | |
5260325f | 152 | { |
d7ac5f18 | 153 | debug2("channel %d: ibuf empty", c->self); |
5260325f | 154 | if (buffer_len(&c->input)) { |
f048f3e2 | 155 | error("channel %d: chan_ibuf_empty for non empty buffer", |
7e7327a1 | 156 | c->self); |
8efc0c15 | 157 | return; |
158 | } | |
5260325f | 159 | switch (c->istate) { |
8efc0c15 | 160 | case CHAN_INPUT_WAIT_DRAIN: |
3057c23b | 161 | if (compat20) { |
162 | if (!(c->flags & CHAN_CLOSE_SENT)) | |
163 | chan_send_eof2(c); | |
164 | chan_set_istate(c, CHAN_INPUT_CLOSED); | |
165 | } else { | |
166 | chan_send_ieof1(c); | |
167 | chan_set_istate(c, CHAN_INPUT_WAIT_OCLOSE); | |
168 | } | |
8efc0c15 | 169 | break; |
170 | default: | |
f048f3e2 | 171 | error("channel %d: chan_ibuf_empty for istate %d", |
7e7327a1 | 172 | c->self, c->istate); |
8efc0c15 | 173 | break; |
174 | } | |
175 | } | |
7e7327a1 | 176 | static void |
177 | chan_rcvd_ieof1(Channel *c) | |
5260325f | 178 | { |
d7ac5f18 | 179 | debug2("channel %d: rcvd ieof", c->self); |
5260325f | 180 | switch (c->ostate) { |
8efc0c15 | 181 | case CHAN_OUTPUT_OPEN: |
368e9dfc | 182 | chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN); |
8efc0c15 | 183 | break; |
184 | case CHAN_OUTPUT_WAIT_IEOF: | |
368e9dfc | 185 | chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
8efc0c15 | 186 | break; |
187 | default: | |
f048f3e2 | 188 | error("channel %d: protocol error: rcvd_ieof for ostate %d", |
7e7327a1 | 189 | c->self, c->ostate); |
8efc0c15 | 190 | break; |
191 | } | |
192 | } | |
7e7327a1 | 193 | static void |
194 | chan_write_failed1(Channel *c) | |
5260325f | 195 | { |
d7ac5f18 | 196 | debug2("channel %d: write failed", c->self); |
5260325f | 197 | switch (c->ostate) { |
8efc0c15 | 198 | case CHAN_OUTPUT_OPEN: |
1e5e896c | 199 | chan_shutdown_write(c); |
7e7327a1 | 200 | chan_send_oclose1(c); |
368e9dfc | 201 | chan_set_ostate(c, CHAN_OUTPUT_WAIT_IEOF); |
8efc0c15 | 202 | break; |
203 | case CHAN_OUTPUT_WAIT_DRAIN: | |
1e5e896c | 204 | chan_shutdown_write(c); |
7e7327a1 | 205 | chan_send_oclose1(c); |
368e9dfc | 206 | chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
8efc0c15 | 207 | break; |
208 | default: | |
f048f3e2 | 209 | error("channel %d: chan_write_failed for ostate %d", |
7e7327a1 | 210 | c->self, c->ostate); |
8efc0c15 | 211 | break; |
212 | } | |
213 | } | |
70bef40e | 214 | void |
215 | chan_obuf_empty(Channel *c) | |
5260325f | 216 | { |
d7ac5f18 | 217 | debug2("channel %d: obuf empty", c->self); |
5260325f | 218 | if (buffer_len(&c->output)) { |
f048f3e2 | 219 | error("channel %d: chan_obuf_empty for non empty buffer", |
7e7327a1 | 220 | c->self); |
8efc0c15 | 221 | return; |
222 | } | |
5260325f | 223 | switch (c->ostate) { |
8efc0c15 | 224 | case CHAN_OUTPUT_WAIT_DRAIN: |
1e5e896c | 225 | chan_shutdown_write(c); |
3057c23b | 226 | if (!compat20) |
227 | chan_send_oclose1(c); | |
368e9dfc | 228 | chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
8efc0c15 | 229 | break; |
230 | default: | |
f048f3e2 | 231 | error("channel %d: internal error: obuf_empty for ostate %d", |
7e7327a1 | 232 | c->self, c->ostate); |
8efc0c15 | 233 | break; |
234 | } | |
235 | } | |
8efc0c15 | 236 | static void |
7e7327a1 | 237 | chan_send_ieof1(Channel *c) |
5260325f | 238 | { |
d7ac5f18 | 239 | debug2("channel %d: send ieof", c->self); |
5260325f | 240 | switch (c->istate) { |
8efc0c15 | 241 | case CHAN_INPUT_OPEN: |
242 | case CHAN_INPUT_WAIT_DRAIN: | |
243 | packet_start(SSH_MSG_CHANNEL_INPUT_EOF); | |
244 | packet_put_int(c->remote_id); | |
245 | packet_send(); | |
246 | break; | |
247 | default: | |
f048f3e2 | 248 | error("channel %d: cannot send ieof for istate %d", |
7e7327a1 | 249 | c->self, c->istate); |
8efc0c15 | 250 | break; |
251 | } | |
252 | } | |
253 | static void | |
7e7327a1 | 254 | chan_send_oclose1(Channel *c) |
5260325f | 255 | { |
d7ac5f18 | 256 | debug2("channel %d: send oclose", c->self); |
5260325f | 257 | switch (c->ostate) { |
8efc0c15 | 258 | case CHAN_OUTPUT_OPEN: |
259 | case CHAN_OUTPUT_WAIT_DRAIN: | |
9c50edcf | 260 | buffer_clear(&c->output); |
8efc0c15 | 261 | packet_start(SSH_MSG_CHANNEL_OUTPUT_CLOSE); |
262 | packet_put_int(c->remote_id); | |
263 | packet_send(); | |
264 | break; | |
265 | default: | |
f048f3e2 | 266 | error("channel %d: cannot send oclose for ostate %d", |
184eed6a | 267 | c->self, c->ostate); |
8efc0c15 | 268 | break; |
269 | } | |
270 | } | |
5260325f | 271 | |
7e7327a1 | 272 | /* |
273 | * the same for SSH2 | |
274 | */ | |
8efc0c15 | 275 | static void |
668a91b7 | 276 | chan_rcvd_close2(Channel *c) |
5260325f | 277 | { |
d7ac5f18 | 278 | debug2("channel %d: rcvd close", c->self); |
7e7327a1 | 279 | if (c->flags & CHAN_CLOSE_RCVD) |
280 | error("channel %d: protocol error: close rcvd twice", c->self); | |
281 | c->flags |= CHAN_CLOSE_RCVD; | |
282 | if (c->type == SSH_CHANNEL_LARVAL) { | |
283 | /* tear down larval channels immediately */ | |
368e9dfc | 284 | chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
285 | chan_set_istate(c, CHAN_INPUT_CLOSED); | |
7e7327a1 | 286 | return; |
287 | } | |
288 | switch (c->ostate) { | |
289 | case CHAN_OUTPUT_OPEN: | |
f048f3e2 | 290 | /* |
291 | * wait until a data from the channel is consumed if a CLOSE | |
292 | * is received | |
293 | */ | |
368e9dfc | 294 | chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN); |
7e7327a1 | 295 | break; |
296 | } | |
297 | switch (c->istate) { | |
298 | case CHAN_INPUT_OPEN: | |
7e7327a1 | 299 | chan_shutdown_read(c); |
668a91b7 | 300 | chan_set_istate(c, CHAN_INPUT_CLOSED); |
7e7327a1 | 301 | break; |
302 | case CHAN_INPUT_WAIT_DRAIN: | |
7e7327a1 | 303 | chan_send_eof2(c); |
668a91b7 | 304 | chan_set_istate(c, CHAN_INPUT_CLOSED); |
7e7327a1 | 305 | break; |
306 | } | |
8efc0c15 | 307 | } |
308 | static void | |
668a91b7 | 309 | chan_rcvd_eof2(Channel *c) |
5260325f | 310 | { |
d7ac5f18 | 311 | debug2("channel %d: rcvd eof", c->self); |
d2296ed7 | 312 | c->flags |= CHAN_EOF_RCVD; |
368e9dfc | 313 | if (c->ostate == CHAN_OUTPUT_OPEN) |
314 | chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN); | |
8efc0c15 | 315 | } |
7e7327a1 | 316 | static void |
317 | chan_write_failed2(Channel *c) | |
318 | { | |
d7ac5f18 | 319 | debug2("channel %d: write failed", c->self); |
7e7327a1 | 320 | switch (c->ostate) { |
321 | case CHAN_OUTPUT_OPEN: | |
7e7327a1 | 322 | case CHAN_OUTPUT_WAIT_DRAIN: |
7e7327a1 | 323 | chan_shutdown_write(c); |
368e9dfc | 324 | chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
7e7327a1 | 325 | break; |
326 | default: | |
f048f3e2 | 327 | error("channel %d: chan_write_failed for ostate %d", |
7e7327a1 | 328 | c->self, c->ostate); |
329 | break; | |
330 | } | |
331 | } | |
332 | static void | |
7e7327a1 | 333 | chan_send_eof2(Channel *c) |
334 | { | |
d7ac5f18 | 335 | debug2("channel %d: send eof", c->self); |
7e7327a1 | 336 | switch (c->istate) { |
337 | case CHAN_INPUT_WAIT_DRAIN: | |
338 | packet_start(SSH2_MSG_CHANNEL_EOF); | |
339 | packet_put_int(c->remote_id); | |
340 | packet_send(); | |
d2296ed7 | 341 | c->flags |= CHAN_EOF_SENT; |
7e7327a1 | 342 | break; |
343 | default: | |
f048f3e2 | 344 | error("channel %d: cannot send eof for istate %d", |
7e7327a1 | 345 | c->self, c->istate); |
346 | break; | |
347 | } | |
348 | } | |
349 | static void | |
350 | chan_send_close2(Channel *c) | |
351 | { | |
d7ac5f18 | 352 | debug2("channel %d: send close", c->self); |
7e7327a1 | 353 | if (c->ostate != CHAN_OUTPUT_CLOSED || |
354 | c->istate != CHAN_INPUT_CLOSED) { | |
f048f3e2 | 355 | error("channel %d: cannot send close for istate/ostate %d/%d", |
7e7327a1 | 356 | c->self, c->istate, c->ostate); |
357 | } else if (c->flags & CHAN_CLOSE_SENT) { | |
f048f3e2 | 358 | error("channel %d: already sent close", c->self); |
7e7327a1 | 359 | } else { |
360 | packet_start(SSH2_MSG_CHANNEL_CLOSE); | |
361 | packet_put_int(c->remote_id); | |
362 | packet_send(); | |
363 | c->flags |= CHAN_CLOSE_SENT; | |
364 | } | |
365 | } | |
ee55dacf | 366 | |
367 | /* shared */ | |
368 | ||
70bef40e | 369 | void |
370 | chan_rcvd_ieof(Channel *c) | |
371 | { | |
372 | if (compat20) | |
373 | chan_rcvd_eof2(c); | |
374 | else | |
375 | chan_rcvd_ieof1(c); | |
32e7d71f | 376 | if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN && |
7203d6bb | 377 | buffer_len(&c->output) == 0 && |
d2296ed7 | 378 | !CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
32e7d71f | 379 | chan_obuf_empty(c); |
70bef40e | 380 | } |
381 | void | |
382 | chan_rcvd_oclose(Channel *c) | |
383 | { | |
384 | if (compat20) | |
385 | chan_rcvd_close2(c); | |
386 | else | |
387 | chan_rcvd_oclose1(c); | |
388 | } | |
389 | void | |
390 | chan_write_failed(Channel *c) | |
391 | { | |
392 | if (compat20) | |
393 | chan_write_failed2(c); | |
394 | else | |
395 | chan_write_failed1(c); | |
396 | } | |
397 | ||
719fc62f | 398 | void |
399 | chan_mark_dead(Channel *c) | |
400 | { | |
6fd8622b | 401 | c->type = SSH_CHANNEL_ZOMBIE; |
719fc62f | 402 | } |
403 | ||
ee55dacf | 404 | int |
ca75d7de | 405 | chan_is_dead(Channel *c, int do_send) |
5260325f | 406 | { |
6fd8622b | 407 | if (c->type == SSH_CHANNEL_ZOMBIE) { |
d7ac5f18 | 408 | debug2("channel %d: zombie", c->self); |
719fc62f | 409 | return 1; |
6fd8622b | 410 | } |
ee55dacf | 411 | if (c->istate != CHAN_INPUT_CLOSED || c->ostate != CHAN_OUTPUT_CLOSED) |
412 | return 0; | |
413 | if (!compat20) { | |
d7ac5f18 | 414 | debug2("channel %d: is dead", c->self); |
ee55dacf | 415 | return 1; |
416 | } | |
d2296ed7 | 417 | if ((datafellows & SSH_BUG_EXTEOF) && |
418 | c->extended_usage == CHAN_EXTENDED_WRITE && | |
419 | c->efd != -1 && | |
420 | buffer_len(&c->extended) > 0) { | |
875ec275 | 421 | debug2("channel %d: active efd: %d len %d", |
422 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 423 | return 0; |
424 | } | |
425 | if (!(c->flags & CHAN_CLOSE_SENT)) { | |
ca75d7de | 426 | if (do_send) { |
d2296ed7 | 427 | chan_send_close2(c); |
428 | } else { | |
429 | /* channel would be dead if we sent a close */ | |
430 | if (c->flags & CHAN_CLOSE_RCVD) { | |
d7ac5f18 | 431 | debug2("channel %d: almost dead", |
d2296ed7 | 432 | c->self); |
433 | return 1; | |
418e724c | 434 | } |
7e7327a1 | 435 | } |
d2296ed7 | 436 | } |
437 | if ((c->flags & CHAN_CLOSE_SENT) && | |
438 | (c->flags & CHAN_CLOSE_RCVD)) { | |
d7ac5f18 | 439 | debug2("channel %d: is dead", c->self); |
d2296ed7 | 440 | return 1; |
8efc0c15 | 441 | } |
ee55dacf | 442 | return 0; |
8efc0c15 | 443 | } |
7e7327a1 | 444 | |
7e7327a1 | 445 | /* helper */ |
446 | static void | |
447 | chan_shutdown_write(Channel *c) | |
448 | { | |
9c50edcf | 449 | buffer_clear(&c->output); |
7e7327a1 | 450 | if (compat20 && c->type == SSH_CHANNEL_LARVAL) |
451 | return; | |
452 | /* shutdown failure is allowed if write failed already */ | |
d7ac5f18 | 453 | debug2("channel %d: close_write", c->self); |
7e7327a1 | 454 | if (c->sock != -1) { |
455 | if (shutdown(c->sock, SHUT_WR) < 0) | |
d7ac5f18 | 456 | debug2("channel %d: chan_shutdown_write: " |
f048f3e2 | 457 | "shutdown() failed for fd%d: %.100s", |
7e7327a1 | 458 | c->self, c->sock, strerror(errno)); |
459 | } else { | |
489aa2e9 | 460 | if (channel_close_fd(&c->wfd) < 0) |
bbe88b6d | 461 | logit("channel %d: chan_shutdown_write: " |
f048f3e2 | 462 | "close() failed for fd%d: %.100s", |
7e7327a1 | 463 | c->self, c->wfd, strerror(errno)); |
7e7327a1 | 464 | } |
465 | } | |
466 | static void | |
467 | chan_shutdown_read(Channel *c) | |
468 | { | |
469 | if (compat20 && c->type == SSH_CHANNEL_LARVAL) | |
470 | return; | |
d7ac5f18 | 471 | debug2("channel %d: close_read", c->self); |
7e7327a1 | 472 | if (c->sock != -1) { |
2b87da3b | 473 | /* |
47670e77 | 474 | * shutdown(sock, SHUT_READ) may return ENOTCONN if the |
475 | * write side has been closed already. (bug on Linux) | |
f49df8e9 | 476 | * HP-UX may return ENOTCONN also. |
47670e77 | 477 | */ |
478 | if (shutdown(c->sock, SHUT_RD) < 0 | |
f49df8e9 | 479 | && errno != ENOTCONN) |
f048f3e2 | 480 | error("channel %d: chan_shutdown_read: " |
481 | "shutdown() failed for fd%d [i%d o%d]: %.100s", | |
482 | c->self, c->sock, c->istate, c->ostate, | |
1b73841d | 483 | strerror(errno)); |
7e7327a1 | 484 | } else { |
489aa2e9 | 485 | if (channel_close_fd(&c->rfd) < 0) |
bbe88b6d | 486 | logit("channel %d: chan_shutdown_read: " |
f048f3e2 | 487 | "close() failed for fd%d: %.100s", |
7e7327a1 | 488 | c->self, c->rfd, strerror(errno)); |
7e7327a1 | 489 | } |
8efc0c15 | 490 | } |