?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Change the way backoff works. Instead of stopping reading from the pty
[tmux-openbsd.git] / server-client.c
blob059a5c891701baab40992756597df29003f010d1
1 /* $OpenBSD$ */
2
3 /*
4 * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #include <sys/types.h>
20
21 #include <event.h>
22 #include <fcntl.h>
23 #include <string.h>
24 #include <time.h>
25 #include <paths.h>
26 #include <unistd.h>
27
28 #include "tmux.h"
29
30 void server_client_handle_key(int, struct mouse_event *, void *);
31 void server_client_repeat_timer(int, short, void *);
32 void server_client_check_exit(struct client *);
33 void server_client_check_redraw(struct client *);
34 void server_client_set_title(struct client *);
35 void server_client_reset_state(struct client *);
36 void server_client_in_callback(struct bufferevent *, short, void *);
37 void server_client_out_callback(struct bufferevent *, short, void *);
38 void server_client_err_callback(struct bufferevent *, short, void *);
39
40 int server_client_msg_dispatch(struct client *);
41 void server_client_msg_command(struct client *, struct msg_command_data *);
42 void server_client_msg_identify(
43 struct client *, struct msg_identify_data *, int);
44 void server_client_msg_shell(struct client *);
45
46 void printflike2 server_client_msg_error(struct cmd_ctx *, const char *, ...);
47 void printflike2 server_client_msg_print(struct cmd_ctx *, const char *, ...);
48 void printflike2 server_client_msg_info(struct cmd_ctx *, const char *, ...);
49
50 /* Create a new client. */
51 void
52 server_client_create(int fd)
53 {
54 struct client *c;
55 int mode;
56 u_int i;
57
58 if ((mode = fcntl(fd, F_GETFL)) == -1)
59 fatal("fcntl failed");
60 if (fcntl(fd, F_SETFL, mode|O_NONBLOCK) == -1)
61 fatal("fcntl failed");
62 if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
63 fatal("fcntl failed");
64
65 c = xcalloc(1, sizeof *c);
66 c->references = 0;
67 imsg_init(&c->ibuf, fd);
68 server_update_event(c);
69
70 if (gettimeofday(&c->creation_time, NULL) != 0)
71 fatal("gettimeofday failed");
72 memcpy(&c->activity_time, &c->creation_time, sizeof c->activity_time);
73
74 ARRAY_INIT(&c->prompt_hdata);
75
76 c->stdin_event = NULL;
77 c->stdout_event = NULL;
78 c->stderr_event = NULL;
79
80 c->tty.fd = -1;
81 c->title = NULL;
82
83 c->session = NULL;
84 c->tty.sx = 80;
85 c->tty.sy = 24;
86
87 screen_init(&c->status, c->tty.sx, 1, 0);
88 job_tree_init(&c->status_jobs);
89
90 c->message_string = NULL;
91 ARRAY_INIT(&c->message_log);
92
93 c->prompt_string = NULL;
94 c->prompt_buffer = NULL;
95 c->prompt_index = 0;
96
97 evtimer_set(&c->repeat_timer, server_client_repeat_timer, c);
98
99 for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
100 if (ARRAY_ITEM(&clients, i) == NULL) {
101 ARRAY_SET(&clients, i, c);
102 return;
103 }
104 }
105 ARRAY_ADD(&clients, c);
106 log_debug("new client %d", fd);
107 }
108
109 /* Lost a client. */
110 void
111 server_client_lost(struct client *c)
112 {
113 struct message_entry *msg;
114 u_int i;
115
116 for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
117 if (ARRAY_ITEM(&clients, i) == c)
118 ARRAY_SET(&clients, i, NULL);
119 }
120 log_debug("lost client %d", c->ibuf.fd);
121
122 /*
123 * If CLIENT_TERMINAL hasn't been set, then tty_init hasn't been called
124 * and tty_free might close an unrelated fd.
125 */
126 if (c->flags & CLIENT_TERMINAL)
127 tty_free(&c->tty);
128
129 if (c->stdin_fd != -1)
130 close(c->stdin_fd);
131 if (c->stdin_event != NULL)
132 bufferevent_free(c->stdin_event);
133 if (c->stdout_fd != -1)
134 close(c->stdout_fd);
135 if (c->stdout_event != NULL)
136 bufferevent_free(c->stdout_event);
137 if (c->stderr_fd != -1)
138 close(c->stderr_fd);
139 if (c->stderr_event != NULL)
140 bufferevent_free(c->stderr_event);
141
142 screen_free(&c->status);
143 job_tree_free(&c->status_jobs);
144
145 if (c->title != NULL)
146 xfree(c->title);
147
148 evtimer_del(&c->repeat_timer);
149
150 evtimer_del(&c->identify_timer);
151
152 if (c->message_string != NULL)
153 xfree(c->message_string);
154 evtimer_del(&c->message_timer);
155 for (i = 0; i < ARRAY_LENGTH(&c->message_log); i++) {
156 msg = &ARRAY_ITEM(&c->message_log, i);
157 xfree(msg->msg);
158 }
159 ARRAY_FREE(&c->message_log);
160
161 if (c->prompt_string != NULL)
162 xfree(c->prompt_string);
163 if (c->prompt_buffer != NULL)
164 xfree(c->prompt_buffer);
165 for (i = 0; i < ARRAY_LENGTH(&c->prompt_hdata); i++)
166 xfree(ARRAY_ITEM(&c->prompt_hdata, i));
167 ARRAY_FREE(&c->prompt_hdata);
168
169 if (c->cwd != NULL)
170 xfree(c->cwd);
171
172 close(c->ibuf.fd);
173 imsg_clear(&c->ibuf);
174 event_del(&c->event);
175
176 for (i = 0; i < ARRAY_LENGTH(&dead_clients); i++) {
177 if (ARRAY_ITEM(&dead_clients, i) == NULL) {
178 ARRAY_SET(&dead_clients, i, c);
179 break;
180 }
181 }
182 if (i == ARRAY_LENGTH(&dead_clients))
183 ARRAY_ADD(&dead_clients, c);
184 c->flags |= CLIENT_DEAD;
185
186 recalculate_sizes();
187 server_update_socket();
188 }
189
190 /* Process a single client event. */
191 void
192 server_client_callback(int fd, short events, void *data)
193 {
194 struct client *c = data;
195
196 if (c->flags & CLIENT_DEAD)
197 return;
198
199 if (fd == c->ibuf.fd) {
200 if (events & EV_WRITE && msgbuf_write(&c->ibuf.w) < 0)
201 goto client_lost;
202
203 if (c->flags & CLIENT_BAD) {
204 if (c->ibuf.w.queued == 0)
205 goto client_lost;
206 return;
207 }
208
209 if (events & EV_READ && server_client_msg_dispatch(c) != 0)
210 goto client_lost;
211 }
212
213 server_update_event(c);
214 return;
215
216 client_lost:
217 server_client_lost(c);
218 }
219
220 /* Handle client status timer. */
221 void
222 server_client_status_timer(void)
223 {
224 struct client *c;
225 struct session *s;
226 struct job *job;
227 struct timeval tv;
228 u_int i;
229 int interval;
230 time_t difference;
231
232 if (gettimeofday(&tv, NULL) != 0)
233 fatal("gettimeofday failed");
234
235 for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
236 c = ARRAY_ITEM(&clients, i);
237 if (c == NULL || c->session == NULL)
238 continue;
239 if (c->message_string != NULL || c->prompt_string != NULL) {
240 /*
241 * Don't need timed redraw for messages/prompts so bail
242 * now. The status timer isn't reset when they are
243 * redrawn anyway.
244 */
245 continue;
246 }
247 s = c->session;
248
249 if (!options_get_number(&s->options, "status"))
250 continue;
251 interval = options_get_number(&s->options, "status-interval");
252
253 difference = tv.tv_sec - c->status_timer.tv_sec;
254 if (difference >= interval) {
255 RB_FOREACH(job, jobs, &c->status_jobs)
256 job_run(job);
257 c->flags |= CLIENT_STATUS;
258 }
259 }
260 }
261
262 /* Handle data key input from client. */
263 void
264 server_client_handle_key(int key, struct mouse_event *mouse, void *data)
265 {
266 struct client *c = data;
267 struct session *s;
268 struct window *w;
269 struct window_pane *wp;
270 struct options *oo;
271 struct timeval tv;
272 struct key_binding *bd;
273 struct keylist *keylist;
274 int xtimeout, isprefix;
275 u_int i;
276
277 /* Check the client is good to accept input. */
278 if ((c->flags & (CLIENT_DEAD|CLIENT_SUSPENDED)) != 0)
279 return;
280 if (c->session == NULL)
281 return;
282 s = c->session;
283
284 /* Update the activity timer. */
285 if (gettimeofday(&c->activity_time, NULL) != 0)
286 fatal("gettimeofday failed");
287 memcpy(&s->activity_time, &c->activity_time, sizeof s->activity_time);
288
289 w = c->session->curw->window;
290 wp = w->active;
291 oo = &c->session->options;
292
293 /* Special case: number keys jump to pane in identify mode. */
294 if (c->flags & CLIENT_IDENTIFY && key >= '0' && key <= '9') {
295 if (c->flags & CLIENT_READONLY)
296 return;
297 wp = window_pane_at_index(w, key - '0');
298 if (wp != NULL && window_pane_visible(wp))
299 window_set_active_pane(w, wp);
300 server_clear_identify(c);
301 return;
302 }
303
304 /* Handle status line. */
305 if (!(c->flags & CLIENT_READONLY)) {
306 status_message_clear(c);
307 server_clear_identify(c);
308 }
309 if (c->prompt_string != NULL) {
310 if (!(c->flags & CLIENT_READONLY))
311 status_prompt_key(c, key);
312 return;
313 }
314
315 /* Check for mouse keys. */
316 if (key == KEYC_MOUSE) {
317 if (c->flags & CLIENT_READONLY)
318 return;
319 if (options_get_number(oo, "mouse-select-pane")) {
320 window_set_active_at(w, mouse->x, mouse->y);
321 server_redraw_window_borders(w);
322 wp = w->active;
323 }
324 window_pane_mouse(wp, c->session, mouse);
325 return;
326 }
327
328 /* Is this a prefix key? */
329 keylist = options_get_data(&c->session->options, "prefix");
330 isprefix = 0;
331 for (i = 0; i < ARRAY_LENGTH(keylist); i++) {
332 if (key == ARRAY_ITEM(keylist, i)) {
333 isprefix = 1;
334 break;
335 }
336 }
337
338 /* No previous prefix key. */
339 if (!(c->flags & CLIENT_PREFIX)) {
340 if (isprefix)
341 c->flags |= CLIENT_PREFIX;
342 else {
343 /* Try as a non-prefix key binding. */
344 if ((bd = key_bindings_lookup(key)) == NULL) {
345 if (!(c->flags & CLIENT_READONLY))
346 window_pane_key(wp, c->session, key);
347 } else
348 key_bindings_dispatch(bd, c);
349 }
350 return;
351 }
352
353 /* Prefix key already pressed. Reset prefix and lookup key. */
354 c->flags &= ~CLIENT_PREFIX;
355 if ((bd = key_bindings_lookup(key | KEYC_PREFIX)) == NULL) {
356 /* If repeating, treat this as a key, else ignore. */
357 if (c->flags & CLIENT_REPEAT) {
358 c->flags &= ~CLIENT_REPEAT;
359 if (isprefix)
360 c->flags |= CLIENT_PREFIX;
361 else if (!(c->flags & CLIENT_READONLY))
362 window_pane_key(wp, c->session, key);
363 }
364 return;
365 }
366
367 /* If already repeating, but this key can't repeat, skip it. */
368 if (c->flags & CLIENT_REPEAT && !bd->can_repeat) {
369 c->flags &= ~CLIENT_REPEAT;
370 if (isprefix)
371 c->flags |= CLIENT_PREFIX;
372 else if (!(c->flags & CLIENT_READONLY))
373 window_pane_key(wp, c->session, key);
374 return;
375 }
376
377 /* If this key can repeat, reset the repeat flags and timer. */
378 xtimeout = options_get_number(&c->session->options, "repeat-time");
379 if (xtimeout != 0 && bd->can_repeat) {
380 c->flags |= CLIENT_PREFIX|CLIENT_REPEAT;
381
382 tv.tv_sec = xtimeout / 1000;
383 tv.tv_usec = (xtimeout % 1000) * 1000L;
384 evtimer_del(&c->repeat_timer);
385 evtimer_add(&c->repeat_timer, &tv);
386 }
387
388 /* Dispatch the command. */
389 key_bindings_dispatch(bd, c);
390 }
391
392 /* Client functions that need to happen every loop. */
393 void
394 server_client_loop(void)
395 {
396 struct client *c;
397 struct window *w;
398 struct window_pane *wp;
399 u_int i;
400
401 for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
402 c = ARRAY_ITEM(&clients, i);
403 if (c == NULL)
404 continue;
405
406 server_client_check_exit(c);
407 if (c->session != NULL) {
408 server_client_check_redraw(c);
409 server_client_reset_state(c);
410 }
411 }
412
413 /*
414 * Any windows will have been redrawn as part of clients, so clear
415 * their flags now.
416 */
417 for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
418 w = ARRAY_ITEM(&windows, i);
419 if (w == NULL)
420 continue;
421
422 w->flags &= ~WINDOW_REDRAW;
423 TAILQ_FOREACH(wp, &w->panes, entry)
424 wp->flags &= ~PANE_REDRAW;
425 }
426 }
427
428 /*
429 * Update cursor position and mode settings. The scroll region and attributes
430 * are cleared when idle (waiting for an event) as this is the most likely time
431 * a user may interrupt tmux, for example with ~^Z in ssh(1). This is a
432 * compromise between excessive resets and likelihood of an interrupt.
433 *
434 * tty_region/tty_reset/tty_update_mode already take care of not resetting
435 * things that are already in their default state.
436 */
437 void
438 server_client_reset_state(struct client *c)
439 {
440 struct window *w = c->session->curw->window;
441 struct window_pane *wp = w->active;
442 struct screen *s = wp->screen;
443 struct options *oo = &c->session->options;
444 int status, mode;
445
446 tty_region(&c->tty, 0, c->tty.sy - 1);
447
448 status = options_get_number(oo, "status");
449 if (!window_pane_visible(wp) || wp->yoff + s->cy >= c->tty.sy - status)
450 tty_cursor(&c->tty, 0, 0);
451 else
452 tty_cursor(&c->tty, wp->xoff + s->cx, wp->yoff + s->cy);
453
454 mode = s->mode;
455 if (TAILQ_NEXT(TAILQ_FIRST(&w->panes), entry) != NULL &&
456 options_get_number(oo, "mouse-select-pane"))
457 mode |= MODE_MOUSE;
458 tty_update_mode(&c->tty, mode);
459 tty_reset(&c->tty);
460 }
461
462 /* Repeat time callback. */
463 /* ARGSUSED */
464 void
465 server_client_repeat_timer(unused int fd, unused short events, void *data)
466 {
467 struct client *c = data;
468
469 if (c->flags & CLIENT_REPEAT)
470 c->flags &= ~(CLIENT_PREFIX|CLIENT_REPEAT);
471 }
472
473 /* Check if client should be exited. */
474 void
475 server_client_check_exit(struct client *c)
476 {
477 struct msg_exit_data exitdata;
478
479 if (!(c->flags & CLIENT_EXIT))
480 return;
481
482 if (c->stdout_fd != -1 && c->stdout_event != NULL &&
483 EVBUFFER_LENGTH(c->stdout_event->output) != 0)
484 return;
485 if (c->stderr_fd != -1 && c->stderr_event != NULL &&
486 EVBUFFER_LENGTH(c->stderr_event->output) != 0)
487 return;
488
489 exitdata.retcode = c->retcode;
490 server_write_client(c, MSG_EXIT, &exitdata, sizeof exitdata);
491
492 c->flags &= ~CLIENT_EXIT;
493 }
494
495 /*
496 * Check if the client should backoff. During backoff, data from external
497 * programs is not written to the terminal. When the existing data drains, the
498 * client is redrawn.
499 *
500 * There are two backoff phases - both the tty and client have backoff flags -
501 * the first to allow existing data to drain and the latter to ensure backoff
502 * is disabled until the redraw has finished and prevent the redraw triggering
503 * another backoff.
504 */
505 void
506 server_client_check_backoff(struct client *c)
507 {
508 struct tty *tty = &c->tty;
509 size_t used;
510
511 used = EVBUFFER_LENGTH(tty->event->output);
512
513 /*
514 * If in the second backoff phase (redrawing), don't check backoff
515 * until the redraw has completed (or enough of it to drop below the
516 * backoff threshold).
517 */
518 if (c->flags & CLIENT_BACKOFF) {
519 if (used > BACKOFF_THRESHOLD)
520 return;
521 c->flags &= ~CLIENT_BACKOFF;
522 return;
523 }
524
525 /* Once drained, allow data through again and schedule redraw. */
526 if (tty->flags & TTY_BACKOFF) {
527 if (used != 0)
528 return;
529 tty->flags &= ~TTY_BACKOFF;
530 c->flags |= (CLIENT_BACKOFF|CLIENT_REDRAWWINDOW|CLIENT_STATUS);
531 return;
532 }
533
534 /* If too much data, start backoff. */
535 if (used > BACKOFF_THRESHOLD)
536 tty->flags |= TTY_BACKOFF;
537 }
538
539 /* Check for client redraws. */
540 void
541 server_client_check_redraw(struct client *c)
542 {
543 struct session *s = c->session;
544 struct window_pane *wp;
545 int flags, redraw;
546
547 flags = c->tty.flags & TTY_FREEZE;
548 c->tty.flags &= ~TTY_FREEZE;
549
550 if (c->flags & (CLIENT_REDRAW|CLIENT_STATUS)) {
551 if (options_get_number(&s->options, "set-titles"))
552 server_client_set_title(c);
553
554 if (c->message_string != NULL)
555 redraw = status_message_redraw(c);
556 else if (c->prompt_string != NULL)
557 redraw = status_prompt_redraw(c);
558 else
559 redraw = status_redraw(c);
560 if (!redraw)
561 c->flags &= ~CLIENT_STATUS;
562 }
563
564 if (c->flags & CLIENT_REDRAW) {
565 screen_redraw_screen(c, 0, 0);
566 c->flags &= ~(CLIENT_STATUS|CLIENT_BORDERS);
567 } else if (c->flags & CLIENT_REDRAWWINDOW) {
568 TAILQ_FOREACH(wp, &c->session->curw->window->panes, entry)
569 screen_redraw_pane(c, wp);
570 c->flags &= ~CLIENT_REDRAWWINDOW;
571 } else {
572 TAILQ_FOREACH(wp, &c->session->curw->window->panes, entry) {
573 if (wp->flags & PANE_REDRAW)
574 screen_redraw_pane(c, wp);
575 }
576 }
577
578 if (c->flags & CLIENT_BORDERS)
579 screen_redraw_screen(c, 0, 1);
580
581 if (c->flags & CLIENT_STATUS)
582 screen_redraw_screen(c, 1, 0);
583
584 c->tty.flags |= flags;
585
586 c->flags &= ~(CLIENT_REDRAW|CLIENT_STATUS|CLIENT_BORDERS);
587 }
588
589 /* Set client title. */
590 void
591 server_client_set_title(struct client *c)
592 {
593 struct session *s = c->session;
594 const char *template;
595 char *title;
596
597 template = options_get_string(&s->options, "set-titles-string");
598
599 title = status_replace(c, NULL, template, time(NULL), 1);
600 if (c->title == NULL || strcmp(title, c->title) != 0) {
601 if (c->title != NULL)
602 xfree(c->title);
603 c->title = xstrdup(title);
604 tty_set_title(&c->tty, c->title);
605 }
606 xfree(title);
607 }
608
609 /*
610 * Error callback for client stdin. Caller must increase reference count when
611 * enabling event!
612 */
613 void
614 server_client_in_callback(
615 unused struct bufferevent *bufev, unused short what, void *data)
616 {
617 struct client *c = data;
618
619 c->references--;
620 if (c->flags & CLIENT_DEAD)
621 return;
622
623 bufferevent_disable(c->stdin_event, EV_READ|EV_WRITE);
624 close(c->stdin_fd);
625 c->stdin_fd = -1;
626
627 if (c->stdin_callback != NULL)
628 c->stdin_callback(c, c->stdin_data);
629 }
630
631 /* Error callback for client stdout. */
632 void
633 server_client_out_callback(
634 unused struct bufferevent *bufev, unused short what, unused void *data)
635 {
636 struct client *c = data;
637
638 bufferevent_disable(c->stdout_event, EV_READ|EV_WRITE);
639 close(c->stdout_fd);
640 c->stdout_fd = -1;
641 }
642
643 /* Error callback for client stderr. */
644 void
645 server_client_err_callback(
646 unused struct bufferevent *bufev, unused short what, unused void *data)
647 {
648 struct client *c = data;
649
650 bufferevent_disable(c->stderr_event, EV_READ|EV_WRITE);
651 close(c->stderr_fd);
652 c->stderr_fd = -1;
653 }
654
655 /* Dispatch message from client. */
656 int
657 server_client_msg_dispatch(struct client *c)
658 {
659 struct imsg imsg;
660 struct msg_command_data commanddata;
661 struct msg_identify_data identifydata;
662 struct msg_environ_data environdata;
663 ssize_t n, datalen;
664 int mode;
665
666 if ((n = imsg_read(&c->ibuf)) == -1 || n == 0)
667 return (-1);
668
669 for (;;) {
670 if ((n = imsg_get(&c->ibuf, &imsg)) == -1)
671 return (-1);
672 if (n == 0)
673 return (0);
674 datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
675
676 if (imsg.hdr.peerid != PROTOCOL_VERSION) {
677 server_write_client(c, MSG_VERSION, NULL, 0);
678 c->flags |= CLIENT_BAD;
679 imsg_free(&imsg);
680 continue;
681 }
682
683 log_debug("got %d from client %d", imsg.hdr.type, c->ibuf.fd);
684 switch (imsg.hdr.type) {
685 case MSG_COMMAND:
686 if (datalen != sizeof commanddata)
687 fatalx("bad MSG_COMMAND size");
688 memcpy(&commanddata, imsg.data, sizeof commanddata);
689
690 server_client_msg_command(c, &commanddata);
691 break;
692 case MSG_IDENTIFY:
693 if (datalen != sizeof identifydata)
694 fatalx("bad MSG_IDENTIFY size");
695 if (imsg.fd == -1)
696 fatalx("MSG_IDENTIFY missing fd");
697 memcpy(&identifydata, imsg.data, sizeof identifydata);
698
699 c->stdin_fd = dup(imsg.fd);
700 if (c->stdin_fd == -1)
701 fatal("dup failed");
702 c->stdin_event = bufferevent_new(c->stdin_fd,
703 NULL, NULL, server_client_in_callback, c);
704 if (c->stdin_event == NULL)
705 fatalx("failed to create stdin event");
706
707 if ((mode = fcntl(imsg.fd, F_GETFL)) != -1)
708 fcntl(imsg.fd, F_SETFL, mode|O_NONBLOCK);
709 if (fcntl(imsg.fd, F_SETFD, FD_CLOEXEC) == -1)
710 fatal("fcntl failed");
711
712 server_client_msg_identify(c, &identifydata, imsg.fd);
713 break;
714 case MSG_STDOUT:
715 if (datalen != 0)
716 fatalx("bad MSG_STDOUT size");
717 if (imsg.fd == -1)
718 fatalx("MSG_STDOUT missing fd");
719
720 c->stdout_fd = imsg.fd;
721 c->stdout_event = bufferevent_new(c->stdout_fd,
722 NULL, NULL, server_client_out_callback, c);
723 if (c->stdout_event == NULL)
724 fatalx("failed to create stdout event");
725
726 if ((mode = fcntl(c->stdout_fd, F_GETFL)) != -1)
727 fcntl(c->stdout_fd, F_SETFL, mode|O_NONBLOCK);
728 if (fcntl(c->stdout_fd, F_SETFD, FD_CLOEXEC) == -1)
729 fatal("fcntl failed");
730 break;
731 case MSG_STDERR:
732 if (datalen != 0)
733 fatalx("bad MSG_STDERR size");
734 if (imsg.fd == -1)
735 fatalx("MSG_STDERR missing fd");
736
737 c->stderr_fd = imsg.fd;
738 c->stderr_event = bufferevent_new(c->stderr_fd,
739 NULL, NULL, server_client_err_callback, c);
740 if (c->stderr_event == NULL)
741 fatalx("failed to create stderr event");
742
743 if ((mode = fcntl(c->stderr_fd, F_GETFL)) != -1)
744 fcntl(c->stderr_fd, F_SETFL, mode|O_NONBLOCK);
745 if (fcntl(c->stderr_fd, F_SETFD, FD_CLOEXEC) == -1)
746 fatal("fcntl failed");
747 break;
748 case MSG_RESIZE:
749 if (datalen != 0)
750 fatalx("bad MSG_RESIZE size");
751
752 if (tty_resize(&c->tty)) {
753 recalculate_sizes();
754 server_redraw_client(c);
755 }
756 break;
757 case MSG_EXITING:
758 if (datalen != 0)
759 fatalx("bad MSG_EXITING size");
760
761 c->session = NULL;
762 tty_close(&c->tty);
763 server_write_client(c, MSG_EXITED, NULL, 0);
764 break;
765 case MSG_WAKEUP:
766 case MSG_UNLOCK:
767 if (datalen != 0)
768 fatalx("bad MSG_WAKEUP size");
769
770 if (!(c->flags & CLIENT_SUSPENDED))
771 break;
772 c->flags &= ~CLIENT_SUSPENDED;
773
774 if (gettimeofday(&c->activity_time, NULL) != 0)
775 fatal("gettimeofday");
776 if (c->session != NULL) {
777 memcpy(&c->session->activity_time,
778 &c->activity_time,
779 sizeof c->session->activity_time);
780 }
781
782 tty_start_tty(&c->tty);
783 server_redraw_client(c);
784 recalculate_sizes();
785 break;
786 case MSG_ENVIRON:
787 if (datalen != sizeof environdata)
788 fatalx("bad MSG_ENVIRON size");
789 memcpy(&environdata, imsg.data, sizeof environdata);
790
791 environdata.var[(sizeof environdata.var) - 1] = '\0';
792 if (strchr(environdata.var, '=') != NULL)
793 environ_put(&c->environ, environdata.var);
794 break;
795 case MSG_SHELL:
796 if (datalen != 0)
797 fatalx("bad MSG_SHELL size");
798
799 server_client_msg_shell(c);
800 break;
801 default:
802 fatalx("unexpected message");
803 }
804
805 imsg_free(&imsg);
806 }
807 }
808
809 /* Callback to send error message to client. */
810 void printflike2
811 server_client_msg_error(struct cmd_ctx *ctx, const char *fmt, ...)
812 {
813 va_list ap;
814
815 va_start(ap, fmt);
816 evbuffer_add_vprintf(ctx->cmdclient->stderr_event->output, fmt, ap);
817 va_end(ap);
818
819 bufferevent_write(ctx->cmdclient->stderr_event, "\n", 1);
820 ctx->cmdclient->retcode = 1;
821 }
822
823 /* Callback to send print message to client. */
824 void printflike2
825 server_client_msg_print(struct cmd_ctx *ctx, const char *fmt, ...)
826 {
827 va_list ap;
828
829 va_start(ap, fmt);
830 evbuffer_add_vprintf(ctx->cmdclient->stdout_event->output, fmt, ap);
831 va_end(ap);
832
833 bufferevent_write(ctx->cmdclient->stdout_event, "\n", 1);
834 }
835
836 /* Callback to send print message to client, if not quiet. */
837 void printflike2
838 server_client_msg_info(struct cmd_ctx *ctx, const char *fmt, ...)
839 {
840 va_list ap;
841
842 if (options_get_number(&global_options, "quiet"))
843 return;
844
845 va_start(ap, fmt);
846 evbuffer_add_vprintf(ctx->cmdclient->stdout_event->output, fmt, ap);
847 va_end(ap);
848
849 bufferevent_write(ctx->cmdclient->stdout_event, "\n", 1);
850 }
851
852 /* Handle command message. */
853 void
854 server_client_msg_command(struct client *c, struct msg_command_data *data)
855 {
856 struct cmd_ctx ctx;
857 struct cmd_list *cmdlist = NULL;
858 int argc;
859 char **argv, *cause;
860
861 ctx.error = server_client_msg_error;
862 ctx.print = server_client_msg_print;
863 ctx.info = server_client_msg_info;
864
865 ctx.msgdata = data;
866 ctx.curclient = NULL;
867
868 ctx.cmdclient = c;
869
870 argc = data->argc;
871 data->argv[(sizeof data->argv) - 1] = '\0';
872 if (cmd_unpack_argv(data->argv, sizeof data->argv, argc, &argv) != 0) {
873 server_client_msg_error(&ctx, "command too long");
874 goto error;
875 }
876
877 if (argc == 0) {
878 argc = 1;
879 argv = xcalloc(1, sizeof *argv);
880 *argv = xstrdup("new-session");
881 }
882
883 if ((cmdlist = cmd_list_parse(argc, argv, &cause)) == NULL) {
884 server_client_msg_error(&ctx, "%s", cause);
885 cmd_free_argv(argc, argv);
886 goto error;
887 }
888 cmd_free_argv(argc, argv);
889
890 if (cmd_list_exec(cmdlist, &ctx) != 1)
891 c->flags |= CLIENT_EXIT;
892 cmd_list_free(cmdlist);
893 return;
894
895 error:
896 if (cmdlist != NULL)
897 cmd_list_free(cmdlist);
898 c->flags |= CLIENT_EXIT;
899 }
900
901 /* Handle identify message. */
902 void
903 server_client_msg_identify(
904 struct client *c, struct msg_identify_data *data, int fd)
905 {
906 int tty_fd;
907
908 c->cwd = NULL;
909 data->cwd[(sizeof data->cwd) - 1] = '\0';
910 if (*data->cwd != '\0')
911 c->cwd = xstrdup(data->cwd);
912
913 if (!isatty(fd))
914 return;
915 if ((tty_fd = dup(fd)) == -1)
916 fatal("dup failed");
917 data->term[(sizeof data->term) - 1] = '\0';
918 tty_init(&c->tty, tty_fd, data->term);
919 if (data->flags & IDENTIFY_UTF8)
920 c->tty.flags |= TTY_UTF8;
921 if (data->flags & IDENTIFY_256COLOURS)
922 c->tty.term_flags |= TERM_256COLOURS;
923 else if (data->flags & IDENTIFY_88COLOURS)
924 c->tty.term_flags |= TERM_88COLOURS;
925 c->tty.key_callback = server_client_handle_key;
926 c->tty.key_data = c;
927
928 tty_resize(&c->tty);
929
930 c->flags |= CLIENT_TERMINAL;
931 }
932
933 /* Handle shell message. */
934 void
935 server_client_msg_shell(struct client *c)
936 {
937 struct msg_shell_data data;
938 const char *shell;
939
940 shell = options_get_string(&global_s_options, "default-shell");
941
942 if (*shell == '\0' || areshell(shell))
943 shell = _PATH_BSHELL;
944 if (strlcpy(data.shell, shell, sizeof data.shell) >= sizeof data.shell)
945 strlcpy(data.shell, _PATH_BSHELL, sizeof data.shell);
946
947 server_write_client(c, MSG_SHELL, &data, sizeof data);
948 c->flags |= CLIENT_BAD; /* it will die after exec */
949 }