Lines Matching +full:1 +full:- +full:channel
8 * 1. Redistributions of source code must retain the above copyright
35 #include "openbsd-compat/sys-queue.h"
45 * SSH Protocol 1.5 aka New Channel Protocol
52 * 1.3: strict request-ack-protocol:
53 * CLOSE ->
54 * <- CLOSE_CONFIRM
57 * IEOF ->
58 * <- OCLOSE
59 * <- IEOF
60 * OCLOSE ->
61 * i.e. both sides have to close the channel
65 * See the debugging output from 'ssh -v' and 'sshd -d' of
66 * ssh-1.2.27 as an example.
70 /* functions manipulating channel states */
72 * EVENTS update channel input/output states execute ACTIONS
75 * ACTIONS: should never update the channel states
77 static void chan_send_eof2(struct ssh *, Channel *);
78 static void chan_send_eow2(struct ssh *, Channel *);
81 static void chan_shutdown_write(struct ssh *, Channel *);
82 static void chan_shutdown_read(struct ssh *, Channel *);
83 static void chan_shutdown_extended_read(struct ssh *, Channel *);
93 chan_set_istate(Channel *c, u_int next) in chan_set_istate()
95 if (c->istate > CHAN_INPUT_CLOSED || next > CHAN_INPUT_CLOSED) in chan_set_istate()
96 fatal("chan_set_istate: bad state %d -> %d", c->istate, next); in chan_set_istate()
97 debug2("channel %d: input %s -> %s", c->self, istates[c->istate], in chan_set_istate()
99 c->istate = next; in chan_set_istate()
103 chan_set_ostate(Channel *c, u_int next) in chan_set_ostate()
105 if (c->ostate > CHAN_OUTPUT_CLOSED || next > CHAN_OUTPUT_CLOSED) in chan_set_ostate()
106 fatal("chan_set_ostate: bad state %d -> %d", c->ostate, next); in chan_set_ostate()
107 debug2("channel %d: output %s -> %s", c->self, ostates[c->ostate], in chan_set_ostate()
109 c->ostate = next; in chan_set_ostate()
113 chan_read_failed(struct ssh *ssh, Channel *c) in chan_read_failed()
115 debug2("channel %d: read failed", c->self); in chan_read_failed()
116 switch (c->istate) { in chan_read_failed()
122 error("channel %d: chan_read_failed for istate %d", in chan_read_failed()
123 c->self, c->istate); in chan_read_failed()
129 chan_ibuf_empty(struct ssh *ssh, Channel *c) in chan_ibuf_empty()
131 debug2("channel %d: ibuf empty", c->self); in chan_ibuf_empty()
132 if (sshbuf_len(c->input)) { in chan_ibuf_empty()
133 error("channel %d: chan_ibuf_empty for non empty buffer", in chan_ibuf_empty()
134 c->self); in chan_ibuf_empty()
137 switch (c->istate) { in chan_ibuf_empty()
139 if (!(c->flags & (CHAN_CLOSE_SENT|CHAN_LOCAL))) in chan_ibuf_empty()
144 error("channel %d: chan_ibuf_empty for istate %d", in chan_ibuf_empty()
145 c->self, c->istate); in chan_ibuf_empty()
151 chan_obuf_empty(struct ssh *ssh, Channel *c) in chan_obuf_empty()
153 debug2("channel %d: obuf empty", c->self); in chan_obuf_empty()
154 if (sshbuf_len(c->output)) { in chan_obuf_empty()
155 error("channel %d: chan_obuf_empty for non empty buffer", in chan_obuf_empty()
156 c->self); in chan_obuf_empty()
159 switch (c->ostate) { in chan_obuf_empty()
165 error("channel %d: internal error: obuf_empty for ostate %d", in chan_obuf_empty()
166 c->self, c->ostate); in chan_obuf_empty()
172 chan_rcvd_eow(struct ssh *ssh, Channel *c) in chan_rcvd_eow()
174 debug2("channel %d: rcvd eow", c->self); in chan_rcvd_eow()
175 switch (c->istate) { in chan_rcvd_eow()
184 chan_send_eof2(struct ssh *ssh, Channel *c) in chan_send_eof2()
188 debug2("channel %d: send eof", c->self); in chan_send_eof2()
189 switch (c->istate) { in chan_send_eof2()
191 if (!c->have_remote_id) in chan_send_eof2()
192 fatal_f("channel %d: no remote_id", c->self); in chan_send_eof2()
194 (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 || in chan_send_eof2()
197 c->flags |= CHAN_EOF_SENT; in chan_send_eof2()
200 error("channel %d: cannot send eof for istate %d", in chan_send_eof2()
201 c->self, c->istate); in chan_send_eof2()
207 chan_send_close2(struct ssh *ssh, Channel *c) in chan_send_close2()
211 debug2("channel %d: send_close2", c->self); in chan_send_close2()
212 if (c->ostate != CHAN_OUTPUT_CLOSED || in chan_send_close2()
213 c->istate != CHAN_INPUT_CLOSED) { in chan_send_close2()
214 error("channel %d: cannot send close for istate/ostate %d/%d", in chan_send_close2()
215 c->self, c->istate, c->ostate); in chan_send_close2()
216 } else if (c->flags & CHAN_CLOSE_SENT) { in chan_send_close2()
217 error("channel %d: already sent close", c->self); in chan_send_close2()
219 if (!c->have_remote_id) in chan_send_close2()
220 fatal_f("channel %d: no remote_id", c->self); in chan_send_close2()
221 debug2("channel %d: send close for remote id %u", c->self, in chan_send_close2()
222 c->remote_id); in chan_send_close2()
224 (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 || in chan_send_close2()
227 c->flags |= CHAN_CLOSE_SENT; in chan_send_close2()
232 chan_send_eow2(struct ssh *ssh, Channel *c) in chan_send_eow2()
236 debug2("channel %d: send eow", c->self); in chan_send_eow2()
237 if (c->ostate == CHAN_OUTPUT_CLOSED) { in chan_send_eow2()
238 error("channel %d: must not sent eow on closed output", in chan_send_eow2()
239 c->self); in chan_send_eow2()
242 if (!(ssh->compat & SSH_NEW_OPENSSH)) in chan_send_eow2()
244 if (!c->have_remote_id) in chan_send_eow2()
245 fatal_f("channel %d: no remote_id", c->self); in chan_send_eow2()
247 (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 || in chan_send_eow2()
257 chan_rcvd_ieof(struct ssh *ssh, Channel *c) in chan_rcvd_ieof()
259 debug2("channel %d: rcvd eof", c->self); in chan_rcvd_ieof()
260 c->flags |= CHAN_EOF_RCVD; in chan_rcvd_ieof()
261 if (c->ostate == CHAN_OUTPUT_OPEN) in chan_rcvd_ieof()
263 if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN && in chan_rcvd_ieof()
264 sshbuf_len(c->output) == 0 && in chan_rcvd_ieof()
270 chan_rcvd_oclose(struct ssh *ssh, Channel *c) in chan_rcvd_oclose()
272 debug2("channel %d: rcvd close", c->self); in chan_rcvd_oclose()
273 if (!(c->flags & CHAN_LOCAL)) { in chan_rcvd_oclose()
274 if (c->flags & CHAN_CLOSE_RCVD) in chan_rcvd_oclose()
275 error("channel %d: protocol error: close rcvd twice", in chan_rcvd_oclose()
276 c->self); in chan_rcvd_oclose()
277 c->flags |= CHAN_CLOSE_RCVD; in chan_rcvd_oclose()
279 if (c->type == SSH_CHANNEL_LARVAL) { in chan_rcvd_oclose()
285 switch (c->ostate) { in chan_rcvd_oclose()
288 * wait until a data from the channel is consumed if a CLOSE in chan_rcvd_oclose()
294 switch (c->istate) { in chan_rcvd_oclose()
301 if (!(c->flags & CHAN_LOCAL)) in chan_rcvd_oclose()
310 chan_write_failed(struct ssh *ssh, Channel *c) in chan_write_failed()
312 debug2("channel %d: write failed", c->self); in chan_write_failed()
313 switch (c->ostate) { in chan_write_failed()
317 if (strcmp(c->ctype, "session") == 0) in chan_write_failed()
322 error("channel %d: chan_write_failed for ostate %d", in chan_write_failed()
323 c->self, c->ostate); in chan_write_failed()
329 chan_mark_dead(struct ssh *ssh, Channel *c) in chan_mark_dead()
331 c->type = SSH_CHANNEL_ZOMBIE; in chan_mark_dead()
335 chan_is_dead(struct ssh *ssh, Channel *c, int do_send) in chan_is_dead()
337 if (c->type == SSH_CHANNEL_ZOMBIE) { in chan_is_dead()
338 debug2("channel %d: zombie", c->self); in chan_is_dead()
339 return 1; in chan_is_dead()
341 if (c->istate != CHAN_INPUT_CLOSED || c->ostate != CHAN_OUTPUT_CLOSED) in chan_is_dead()
343 if ((ssh->compat & SSH_BUG_EXTEOF) && in chan_is_dead()
344 c->extended_usage == CHAN_EXTENDED_WRITE && in chan_is_dead()
345 c->efd != -1 && in chan_is_dead()
346 sshbuf_len(c->extended) > 0) { in chan_is_dead()
347 debug2("channel %d: active efd: %d len %zu", in chan_is_dead()
348 c->self, c->efd, sshbuf_len(c->extended)); in chan_is_dead()
351 if (c->flags & CHAN_LOCAL) { in chan_is_dead()
352 debug2("channel %d: is dead (local)", c->self); in chan_is_dead()
353 return 1; in chan_is_dead()
355 if (!(c->flags & CHAN_CLOSE_SENT)) { in chan_is_dead()
359 /* channel would be dead if we sent a close */ in chan_is_dead()
360 if (c->flags & CHAN_CLOSE_RCVD) { in chan_is_dead()
361 debug2("channel %d: almost dead", in chan_is_dead()
362 c->self); in chan_is_dead()
363 return 1; in chan_is_dead()
367 if ((c->flags & CHAN_CLOSE_SENT) && in chan_is_dead()
368 (c->flags & CHAN_CLOSE_RCVD)) { in chan_is_dead()
369 debug2("channel %d: is dead", c->self); in chan_is_dead()
370 return 1; in chan_is_dead()
377 chan_shutdown_write(struct ssh *ssh, Channel *c) in chan_shutdown_write()
379 sshbuf_reset(c->output); in chan_shutdown_write()
380 if (c->type == SSH_CHANNEL_LARVAL) in chan_shutdown_write()
383 debug2_f("channel %d: (i%d o%d sock %d wfd %d efd %d [%s])", in chan_shutdown_write()
384 c->self, c->istate, c->ostate, c->sock, c->wfd, c->efd, in chan_shutdown_write()
386 if (c->sock != -1) { in chan_shutdown_write()
387 if (shutdown(c->sock, SHUT_WR) == -1) { in chan_shutdown_write()
388 debug2_f("channel %d: shutdown() failed for " in chan_shutdown_write()
389 "fd %d [i%d o%d]: %.100s", c->self, c->sock, in chan_shutdown_write()
390 c->istate, c->ostate, strerror(errno)); in chan_shutdown_write()
393 if (channel_close_fd(ssh, c, &c->wfd) < 0) { in chan_shutdown_write()
394 logit_f("channel %d: close() failed for " in chan_shutdown_write()
395 "fd %d [i%d o%d]: %.100s", c->self, c->wfd, in chan_shutdown_write()
396 c->istate, c->ostate, strerror(errno)); in chan_shutdown_write()
402 chan_shutdown_read(struct ssh *ssh, Channel *c) in chan_shutdown_read()
404 if (c->type == SSH_CHANNEL_LARVAL) in chan_shutdown_read()
406 debug2_f("channel %d: (i%d o%d sock %d wfd %d efd %d [%s])", in chan_shutdown_read()
407 c->self, c->istate, c->ostate, c->sock, c->rfd, c->efd, in chan_shutdown_read()
409 if (c->sock != -1) { in chan_shutdown_read()
413 * HP-UX may return ENOTCONN also. in chan_shutdown_read()
415 if (shutdown(c->sock, SHUT_RD) == -1 && errno != ENOTCONN) { in chan_shutdown_read()
416 error_f("channel %d: shutdown() failed for " in chan_shutdown_read()
417 "fd %d [i%d o%d]: %.100s", c->self, c->sock, in chan_shutdown_read()
418 c->istate, c->ostate, strerror(errno)); in chan_shutdown_read()
421 if (channel_close_fd(ssh, c, &c->rfd) < 0) { in chan_shutdown_read()
422 logit_f("channel %d: close() failed for " in chan_shutdown_read()
423 "fd %d [i%d o%d]: %.100s", c->self, c->rfd, in chan_shutdown_read()
424 c->istate, c->ostate, strerror(errno)); in chan_shutdown_read()
430 chan_shutdown_extended_read(struct ssh *ssh, Channel *c) in chan_shutdown_extended_read()
432 if (c->type == SSH_CHANNEL_LARVAL || c->efd == -1) in chan_shutdown_extended_read()
434 if (c->extended_usage != CHAN_EXTENDED_READ && in chan_shutdown_extended_read()
435 c->extended_usage != CHAN_EXTENDED_IGNORE) in chan_shutdown_extended_read()
437 debug_f("channel %d: (i%d o%d sock %d wfd %d efd %d [%s])", in chan_shutdown_extended_read()
438 c->self, c->istate, c->ostate, c->sock, c->rfd, c->efd, in chan_shutdown_extended_read()
440 if (channel_close_fd(ssh, c, &c->efd) < 0) { in chan_shutdown_extended_read()
441 logit_f("channel %d: close() failed for " in chan_shutdown_extended_read()
442 "extended fd %d [i%d o%d]: %.100s", c->self, c->efd, in chan_shutdown_extended_read()
443 c->istate, c->ostate, strerror(errno)); in chan_shutdown_extended_read()