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Drop the ability to have a list of keys in the prefix in favour of two
[tmux-openbsd.git] / server-client.c
blob138d9a80b14312422a40225ab4b905de986c12a4
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_backoff(struct client *);
34 void server_client_check_redraw(struct client *);
35 void server_client_set_title(struct client *);
36 void server_client_reset_state(struct client *);
37 void server_client_in_callback(struct bufferevent *, short, void *);
38 void server_client_out_callback(struct bufferevent *, short, void *);
39 void server_client_err_callback(struct bufferevent *, short, void *);
40
41 int server_client_msg_dispatch(struct client *);
42 void server_client_msg_command(struct client *, struct msg_command_data *);
43 void server_client_msg_identify(
44 struct client *, struct msg_identify_data *, int);
45 void server_client_msg_shell(struct client *);
46
47 void printflike2 server_client_msg_error(struct cmd_ctx *, const char *, ...);
48 void printflike2 server_client_msg_print(struct cmd_ctx *, const char *, ...);
49 void printflike2 server_client_msg_info(struct cmd_ctx *, const char *, ...);
50
51 /* Create a new client. */
52 void
53 server_client_create(int fd)
54 {
55 struct client *c;
56 u_int i;
57
58 setblocking(fd, 0);
59
60 c = xcalloc(1, sizeof *c);
61 c->references = 0;
62 imsg_init(&c->ibuf, fd);
63 server_update_event(c);
64
65 if (gettimeofday(&c->creation_time, NULL) != 0)
66 fatal("gettimeofday failed");
67 memcpy(&c->activity_time, &c->creation_time, sizeof c->activity_time);
68
69 c->stdin_event = NULL;
70 c->stdout_event = NULL;
71 c->stderr_event = NULL;
72
73 c->tty.fd = -1;
74 c->title = NULL;
75
76 c->session = NULL;
77 c->last_session = NULL;
78 c->tty.sx = 80;
79 c->tty.sy = 24;
80
81 screen_init(&c->status, c->tty.sx, 1, 0);
82 RB_INIT(&c->status_new);
83 RB_INIT(&c->status_old);
84
85 c->message_string = NULL;
86 ARRAY_INIT(&c->message_log);
87
88 c->prompt_string = NULL;
89 c->prompt_buffer = NULL;
90 c->prompt_index = 0;
91
92 c->last_mouse.b = MOUSE_UP;
93 c->last_mouse.x = c->last_mouse.y = -1;
94
95 evtimer_set(&c->repeat_timer, server_client_repeat_timer, c);
96
97 for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
98 if (ARRAY_ITEM(&clients, i) == NULL) {
99 ARRAY_SET(&clients, i, c);
100 return;
101 }
102 }
103 ARRAY_ADD(&clients, c);
104 log_debug("new client %d", fd);
105 }
106
107 /* Lost a client. */
108 void
109 server_client_lost(struct client *c)
110 {
111 struct message_entry *msg;
112 u_int i;
113
114 for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
115 if (ARRAY_ITEM(&clients, i) == c)
116 ARRAY_SET(&clients, i, NULL);
117 }
118 log_debug("lost client %d", c->ibuf.fd);
119
120 /*
121 * If CLIENT_TERMINAL hasn't been set, then tty_init hasn't been called
122 * and tty_free might close an unrelated fd.
123 */
124 if (c->flags & CLIENT_TERMINAL)
125 tty_free(&c->tty);
126
127 if (c->stdin_fd != -1) {
128 setblocking(c->stdin_fd, 1);
129 close(c->stdin_fd);
130 }
131 if (c->stdin_event != NULL)
132 bufferevent_free(c->stdin_event);
133 if (c->stdout_fd != -1) {
134 setblocking(c->stdout_fd, 1);
135 close(c->stdout_fd);
136 }
137 if (c->stdout_event != NULL)
138 bufferevent_free(c->stdout_event);
139 if (c->stderr_fd != -1) {
140 setblocking(c->stderr_fd, 1);
141 close(c->stderr_fd);
142 }
143 if (c->stderr_event != NULL)
144 bufferevent_free(c->stderr_event);
145
146 status_free_jobs(&c->status_new);
147 status_free_jobs(&c->status_old);
148 screen_free(&c->status);
149
150 if (c->title != NULL)
151 xfree(c->title);
152
153 evtimer_del(&c->repeat_timer);
154
155 evtimer_del(&c->identify_timer);
156
157 if (c->message_string != NULL)
158 xfree(c->message_string);
159 evtimer_del(&c->message_timer);
160 for (i = 0; i < ARRAY_LENGTH(&c->message_log); i++) {
161 msg = &ARRAY_ITEM(&c->message_log, i);
162 xfree(msg->msg);
163 }
164 ARRAY_FREE(&c->message_log);
165
166 if (c->prompt_string != NULL)
167 xfree(c->prompt_string);
168 if (c->prompt_buffer != NULL)
169 xfree(c->prompt_buffer);
170
171 if (c->cwd != NULL)
172 xfree(c->cwd);
173
174 environ_free(&c->environ);
175
176 close(c->ibuf.fd);
177 imsg_clear(&c->ibuf);
178 event_del(&c->event);
179
180 for (i = 0; i < ARRAY_LENGTH(&dead_clients); i++) {
181 if (ARRAY_ITEM(&dead_clients, i) == NULL) {
182 ARRAY_SET(&dead_clients, i, c);
183 break;
184 }
185 }
186 if (i == ARRAY_LENGTH(&dead_clients))
187 ARRAY_ADD(&dead_clients, c);
188 c->flags |= CLIENT_DEAD;
189
190 recalculate_sizes();
191 server_check_unattached();
192 server_update_socket();
193 }
194
195 /* Process a single client event. */
196 void
197 server_client_callback(int fd, short events, void *data)
198 {
199 struct client *c = data;
200
201 if (c->flags & CLIENT_DEAD)
202 return;
203
204 if (fd == c->ibuf.fd) {
205 if (events & EV_WRITE && msgbuf_write(&c->ibuf.w) < 0)
206 goto client_lost;
207
208 if (c->flags & CLIENT_BAD) {
209 if (c->ibuf.w.queued == 0)
210 goto client_lost;
211 return;
212 }
213
214 if (events & EV_READ && server_client_msg_dispatch(c) != 0)
215 goto client_lost;
216 }
217
218 server_update_event(c);
219 return;
220
221 client_lost:
222 server_client_lost(c);
223 }
224
225 /* Handle client status timer. */
226 void
227 server_client_status_timer(void)
228 {
229 struct client *c;
230 struct session *s;
231 struct timeval tv;
232 u_int i;
233 int interval;
234 time_t difference;
235
236 if (gettimeofday(&tv, NULL) != 0)
237 fatal("gettimeofday failed");
238
239 for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
240 c = ARRAY_ITEM(&clients, i);
241 if (c == NULL || c->session == NULL)
242 continue;
243 if (c->message_string != NULL || c->prompt_string != NULL) {
244 /*
245 * Don't need timed redraw for messages/prompts so bail
246 * now. The status timer isn't reset when they are
247 * redrawn anyway.
248 */
249 continue;
250 }
251 s = c->session;
252
253 if (!options_get_number(&s->options, "status"))
254 continue;
255 interval = options_get_number(&s->options, "status-interval");
256
257 difference = tv.tv_sec - c->status_timer.tv_sec;
258 if (difference >= interval) {
259 status_update_jobs(c);
260 c->flags |= CLIENT_STATUS;
261 }
262 }
263 }
264
265 /* Handle data key input from client. */
266 void
267 server_client_handle_key(int key, struct mouse_event *mouse, void *data)
268 {
269 struct client *c = data;
270 struct session *s;
271 struct window *w;
272 struct window_pane *wp;
273 struct options *oo;
274 struct timeval tv;
275 struct key_binding *bd;
276 int xtimeout, isprefix;
277
278 /* Check the client is good to accept input. */
279 if ((c->flags & (CLIENT_DEAD|CLIENT_SUSPENDED)) != 0)
280 return;
281 if (c->session == NULL)
282 return;
283 s = c->session;
284
285 /* Update the activity timer. */
286 if (gettimeofday(&c->activity_time, NULL) != 0)
287 fatal("gettimeofday failed");
288 memcpy(&s->activity_time, &c->activity_time, sizeof s->activity_time);
289
290 w = c->session->curw->window;
291 wp = w->active;
292 oo = &c->session->options;
293
294 /* Special case: number keys jump to pane in identify mode. */
295 if (c->flags & CLIENT_IDENTIFY && key >= '0' && key <= '9') {
296 if (c->flags & CLIENT_READONLY)
297 return;
298 wp = window_pane_at_index(w, key - '0');
299 if (wp != NULL && window_pane_visible(wp))
300 window_set_active_pane(w, wp);
301 server_clear_identify(c);
302 return;
303 }
304
305 /* Handle status line. */
306 if (!(c->flags & CLIENT_READONLY)) {
307 status_message_clear(c);
308 server_clear_identify(c);
309 }
310 if (c->prompt_string != NULL) {
311 if (!(c->flags & CLIENT_READONLY))
312 status_prompt_key(c, key);
313 return;
314 }
315
316 /* Check for mouse keys. */
317 if (key == KEYC_MOUSE) {
318 if (c->flags & CLIENT_READONLY)
319 return;
320 if (options_get_number(oo, "mouse-select-pane") &&
321 (!(options_get_number(oo, "status") &&
322 mouse->y + 1 == c->tty.sy)) &&
323 ((!(mouse->b & MOUSE_DRAG) && mouse->b != MOUSE_UP) ||
324 wp->mode != &window_copy_mode)) {
325 /*
326 * Allow pane switching in copy mode only by mouse down
327 * (click).
328 */
329 window_set_active_at(w, mouse->x, mouse->y);
330 server_redraw_window_borders(w);
331 wp = w->active;
332 }
333 if (mouse->y + 1 == c->tty.sy &&
334 options_get_number(oo, "mouse-select-window") &&
335 options_get_number(oo, "status")) {
336 if (mouse->b == MOUSE_UP &&
337 c->last_mouse.b != MOUSE_UP) {
338 status_set_window_at(c, mouse->x);
339 return;
340 }
341 if (mouse->b & MOUSE_45) {
342 if ((mouse->b & MOUSE_BUTTON) == MOUSE_1) {
343 session_previous(c->session, 0);
344 server_redraw_session(s);
345 }
346 if ((mouse->b & MOUSE_BUTTON) == MOUSE_2) {
347 session_next(c->session, 0);
348 server_redraw_session(s);
349 }
350 return;
351 }
352 }
353 if (options_get_number(oo, "mouse-resize-pane"))
354 layout_resize_pane_mouse(c, mouse);
355 memcpy(&c->last_mouse, mouse, sizeof c->last_mouse);
356 window_pane_mouse(wp, c->session, mouse);
357 return;
358 }
359
360 /* Is this a prefix key? */
361 if (key == options_get_number(&c->session->options, "prefix"))
362 isprefix = 1;
363 else if (key == options_get_number(&c->session->options, "prefix2"))
364 isprefix = 1;
365 else
366 isprefix = 0;
367
368 /* No previous prefix key. */
369 if (!(c->flags & CLIENT_PREFIX)) {
370 if (isprefix)
371 c->flags |= CLIENT_PREFIX;
372 else {
373 /* Try as a non-prefix key binding. */
374 if ((bd = key_bindings_lookup(key)) == NULL) {
375 if (!(c->flags & CLIENT_READONLY))
376 window_pane_key(wp, c->session, key);
377 } else
378 key_bindings_dispatch(bd, c);
379 }
380 return;
381 }
382
383 /* Prefix key already pressed. Reset prefix and lookup key. */
384 c->flags &= ~CLIENT_PREFIX;
385 if ((bd = key_bindings_lookup(key | KEYC_PREFIX)) == NULL) {
386 /* If repeating, treat this as a key, else ignore. */
387 if (c->flags & CLIENT_REPEAT) {
388 c->flags &= ~CLIENT_REPEAT;
389 if (isprefix)
390 c->flags |= CLIENT_PREFIX;
391 else if (!(c->flags & CLIENT_READONLY))
392 window_pane_key(wp, c->session, key);
393 }
394 return;
395 }
396
397 /* If already repeating, but this key can't repeat, skip it. */
398 if (c->flags & CLIENT_REPEAT && !bd->can_repeat) {
399 c->flags &= ~CLIENT_REPEAT;
400 if (isprefix)
401 c->flags |= CLIENT_PREFIX;
402 else if (!(c->flags & CLIENT_READONLY))
403 window_pane_key(wp, c->session, key);
404 return;
405 }
406
407 /* If this key can repeat, reset the repeat flags and timer. */
408 xtimeout = options_get_number(&c->session->options, "repeat-time");
409 if (xtimeout != 0 && bd->can_repeat) {
410 c->flags |= CLIENT_PREFIX|CLIENT_REPEAT;
411
412 tv.tv_sec = xtimeout / 1000;
413 tv.tv_usec = (xtimeout % 1000) * 1000L;
414 evtimer_del(&c->repeat_timer);
415 evtimer_add(&c->repeat_timer, &tv);
416 }
417
418 /* Dispatch the command. */
419 key_bindings_dispatch(bd, c);
420 }
421
422 /* Client functions that need to happen every loop. */
423 void
424 server_client_loop(void)
425 {
426 struct client *c;
427 struct window *w;
428 struct window_pane *wp;
429 u_int i;
430
431 for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
432 c = ARRAY_ITEM(&clients, i);
433 if (c == NULL)
434 continue;
435
436 server_client_check_exit(c);
437 if (c->session != NULL) {
438 server_client_check_redraw(c);
439 server_client_reset_state(c);
440 }
441 }
442
443 /*
444 * Any windows will have been redrawn as part of clients, so clear
445 * their flags now.
446 */
447 for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
448 w = ARRAY_ITEM(&windows, i);
449 if (w == NULL)
450 continue;
451
452 w->flags &= ~WINDOW_REDRAW;
453 TAILQ_FOREACH(wp, &w->panes, entry)
454 wp->flags &= ~PANE_REDRAW;
455 }
456 }
457
458 /*
459 * Update cursor position and mode settings. The scroll region and attributes
460 * are cleared when idle (waiting for an event) as this is the most likely time
461 * a user may interrupt tmux, for example with ~^Z in ssh(1). This is a
462 * compromise between excessive resets and likelihood of an interrupt.
463 *
464 * tty_region/tty_reset/tty_update_mode already take care of not resetting
465 * things that are already in their default state.
466 */
467 void
468 server_client_reset_state(struct client *c)
469 {
470 struct window *w = c->session->curw->window;
471 struct window_pane *wp = w->active;
472 struct screen *s = wp->screen;
473 struct options *oo = &c->session->options;
474 struct options *wo = &w->options;
475 int status, mode;
476
477 if (c->flags & CLIENT_SUSPENDED)
478 return;
479
480 tty_region(&c->tty, 0, c->tty.sy - 1);
481
482 status = options_get_number(oo, "status");
483 if (!window_pane_visible(wp) || wp->yoff + s->cy >= c->tty.sy - status)
484 tty_cursor(&c->tty, 0, 0);
485 else
486 tty_cursor(&c->tty, wp->xoff + s->cx, wp->yoff + s->cy);
487
488 /*
489 * Resizing panes with the mouse requires at least button mode to give
490 * a smooth appearance.
491 */
492 mode = s->mode;
493 if ((c->last_mouse.b & MOUSE_RESIZE_PANE) &&
494 !(mode & (MODE_MOUSE_BUTTON|MODE_MOUSE_ANY)))
495 mode |= MODE_MOUSE_BUTTON;
496
497 /*
498 * Any mode will do for mouse-select-pane, but set standard mode if
499 * none.
500 */
501 if ((mode & ALL_MOUSE_MODES) == 0) {
502 if (TAILQ_NEXT(TAILQ_FIRST(&w->panes), entry) != NULL &&
503 options_get_number(oo, "mouse-select-pane"))
504 mode |= MODE_MOUSE_STANDARD;
505 else if (options_get_number(oo, "mouse-resize-pane"))
506 mode |= MODE_MOUSE_STANDARD;
507 else if (options_get_number(oo, "mouse-select-window"))
508 mode |= MODE_MOUSE_STANDARD;
509 else if (options_get_number(wo, "mode-mouse"))
510 mode |= MODE_MOUSE_STANDARD;
511 }
512
513 /*
514 * Set UTF-8 mouse input if required. If the terminal is UTF-8, the
515 * user has set mouse-utf8 and any mouse mode is in effect, turn on
516 * UTF-8 mouse input. If the receiving terminal hasn't requested it
517 * (that is, it isn't in s->mode), then it'll be converted in
518 * input_mouse.
519 */
520 if ((c->tty.flags & TTY_UTF8) &&
521 (mode & ALL_MOUSE_MODES) && options_get_number(oo, "mouse-utf8"))
522 mode |= MODE_MOUSE_UTF8;
523 else
524 mode &= ~MODE_MOUSE_UTF8;
525
526 /* Set the terminal mode and reset attributes. */
527 tty_update_mode(&c->tty, mode, s);
528 tty_reset(&c->tty);
529 }
530
531 /* Repeat time callback. */
532 /* ARGSUSED */
533 void
534 server_client_repeat_timer(unused int fd, unused short events, void *data)
535 {
536 struct client *c = data;
537
538 if (c->flags & CLIENT_REPEAT)
539 c->flags &= ~(CLIENT_PREFIX|CLIENT_REPEAT);
540 }
541
542 /* Check if client should be exited. */
543 void
544 server_client_check_exit(struct client *c)
545 {
546 struct msg_exit_data exitdata;
547
548 if (!(c->flags & CLIENT_EXIT))
549 return;
550
551 if (c->stdout_fd != -1 && c->stdout_event != NULL &&
552 EVBUFFER_LENGTH(c->stdout_event->output) != 0)
553 return;
554 if (c->stderr_fd != -1 && c->stderr_event != NULL &&
555 EVBUFFER_LENGTH(c->stderr_event->output) != 0)
556 return;
557
558 exitdata.retcode = c->retcode;
559 server_write_client(c, MSG_EXIT, &exitdata, sizeof exitdata);
560
561 c->flags &= ~CLIENT_EXIT;
562 }
563
564 /*
565 * Check if the client should backoff. During backoff, data from external
566 * programs is not written to the terminal. When the existing data drains, the
567 * client is redrawn.
568 *
569 * There are two backoff phases - both the tty and client have backoff flags -
570 * the first to allow existing data to drain and the latter to ensure backoff
571 * is disabled until the redraw has finished and prevent the redraw triggering
572 * another backoff.
573 */
574 void
575 server_client_check_backoff(struct client *c)
576 {
577 struct tty *tty = &c->tty;
578 size_t used;
579
580 used = EVBUFFER_LENGTH(tty->event->output);
581
582 /*
583 * If in the second backoff phase (redrawing), don't check backoff
584 * until the redraw has completed (or enough of it to drop below the
585 * backoff threshold).
586 */
587 if (c->flags & CLIENT_BACKOFF) {
588 if (used > BACKOFF_THRESHOLD)
589 return;
590 c->flags &= ~CLIENT_BACKOFF;
591 return;
592 }
593
594 /* Once drained, allow data through again and schedule redraw. */
595 if (tty->flags & TTY_BACKOFF) {
596 if (used != 0)
597 return;
598 tty->flags &= ~TTY_BACKOFF;
599 c->flags |= (CLIENT_BACKOFF|CLIENT_REDRAWWINDOW|CLIENT_STATUS);
600 return;
601 }
602
603 /* If too much data, start backoff. */
604 if (used > BACKOFF_THRESHOLD)
605 tty->flags |= TTY_BACKOFF;
606 }
607
608 /* Check for client redraws. */
609 void
610 server_client_check_redraw(struct client *c)
611 {
612 struct session *s = c->session;
613 struct window_pane *wp;
614 int flags, redraw;
615
616 flags = c->tty.flags & TTY_FREEZE;
617 c->tty.flags &= ~TTY_FREEZE;
618
619 if (c->flags & (CLIENT_REDRAW|CLIENT_STATUS)) {
620 if (options_get_number(&s->options, "set-titles"))
621 server_client_set_title(c);
622
623 if (c->message_string != NULL)
624 redraw = status_message_redraw(c);
625 else if (c->prompt_string != NULL)
626 redraw = status_prompt_redraw(c);
627 else
628 redraw = status_redraw(c);
629 if (!redraw)
630 c->flags &= ~CLIENT_STATUS;
631 }
632
633 if (c->flags & CLIENT_REDRAW) {
634 screen_redraw_screen(c, 0, 0);
635 c->flags &= ~(CLIENT_STATUS|CLIENT_BORDERS);
636 } else if (c->flags & CLIENT_REDRAWWINDOW) {
637 TAILQ_FOREACH(wp, &c->session->curw->window->panes, entry)
638 screen_redraw_pane(c, wp);
639 c->flags &= ~CLIENT_REDRAWWINDOW;
640 } else {
641 TAILQ_FOREACH(wp, &c->session->curw->window->panes, entry) {
642 if (wp->flags & PANE_REDRAW)
643 screen_redraw_pane(c, wp);
644 }
645 }
646
647 if (c->flags & CLIENT_BORDERS)
648 screen_redraw_screen(c, 0, 1);
649
650 if (c->flags & CLIENT_STATUS)
651 screen_redraw_screen(c, 1, 0);
652
653 c->tty.flags |= flags;
654
655 c->flags &= ~(CLIENT_REDRAW|CLIENT_STATUS|CLIENT_BORDERS);
656 }
657
658 /* Set client title. */
659 void
660 server_client_set_title(struct client *c)
661 {
662 struct session *s = c->session;
663 const char *template;
664 char *title;
665
666 template = options_get_string(&s->options, "set-titles-string");
667
668 title = status_replace(c, NULL, NULL, NULL, template, time(NULL), 1);
669 if (c->title == NULL || strcmp(title, c->title) != 0) {
670 if (c->title != NULL)
671 xfree(c->title);
672 c->title = xstrdup(title);
673 tty_set_title(&c->tty, c->title);
674 }
675 xfree(title);
676 }
677
678 /*
679 * Error callback for client stdin. Caller must increase reference count when
680 * enabling event!
681 */
682 void
683 server_client_in_callback(
684 unused struct bufferevent *bufev, unused short what, void *data)
685 {
686 struct client *c = data;
687
688 c->references--;
689 if (c->flags & CLIENT_DEAD)
690 return;
691
692 bufferevent_disable(c->stdin_event, EV_READ|EV_WRITE);
693 setblocking(c->stdin_fd, 1);
694 close(c->stdin_fd);
695 c->stdin_fd = -1;
696
697 if (c->stdin_callback != NULL)
698 c->stdin_callback(c, c->stdin_data);
699 }
700
701 /* Error callback for client stdout. */
702 void
703 server_client_out_callback(
704 unused struct bufferevent *bufev, unused short what, unused void *data)
705 {
706 struct client *c = data;
707
708 bufferevent_disable(c->stdout_event, EV_READ|EV_WRITE);
709 setblocking(c->stdout_fd, 1);
710 close(c->stdout_fd);
711 c->stdout_fd = -1;
712 }
713
714 /* Error callback for client stderr. */
715 void
716 server_client_err_callback(
717 unused struct bufferevent *bufev, unused short what, unused void *data)
718 {
719 struct client *c = data;
720
721 bufferevent_disable(c->stderr_event, EV_READ|EV_WRITE);
722 setblocking(c->stderr_fd, 1);
723 close(c->stderr_fd);
724 c->stderr_fd = -1;
725 }
726
727 /* Dispatch message from client. */
728 int
729 server_client_msg_dispatch(struct client *c)
730 {
731 struct imsg imsg;
732 struct msg_command_data commanddata;
733 struct msg_identify_data identifydata;
734 struct msg_environ_data environdata;
735 ssize_t n, datalen;
736
737 if ((n = imsg_read(&c->ibuf)) == -1 || n == 0)
738 return (-1);
739
740 for (;;) {
741 if ((n = imsg_get(&c->ibuf, &imsg)) == -1)
742 return (-1);
743 if (n == 0)
744 return (0);
745 datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
746
747 if (imsg.hdr.peerid != PROTOCOL_VERSION) {
748 server_write_client(c, MSG_VERSION, NULL, 0);
749 c->flags |= CLIENT_BAD;
750 imsg_free(&imsg);
751 continue;
752 }
753
754 log_debug("got %d from client %d", imsg.hdr.type, c->ibuf.fd);
755 switch (imsg.hdr.type) {
756 case MSG_COMMAND:
757 if (datalen != sizeof commanddata)
758 fatalx("bad MSG_COMMAND size");
759 memcpy(&commanddata, imsg.data, sizeof commanddata);
760
761 server_client_msg_command(c, &commanddata);
762 break;
763 case MSG_IDENTIFY:
764 if (datalen != sizeof identifydata)
765 fatalx("bad MSG_IDENTIFY size");
766 if (imsg.fd == -1)
767 fatalx("MSG_IDENTIFY missing fd");
768 memcpy(&identifydata, imsg.data, sizeof identifydata);
769
770 c->stdin_fd = imsg.fd;
771 c->stdin_event = bufferevent_new(c->stdin_fd,
772 NULL, NULL, server_client_in_callback, c);
773 if (c->stdin_event == NULL)
774 fatalx("failed to create stdin event");
775 setblocking(c->stdin_fd, 0);
776
777 server_client_msg_identify(c, &identifydata, imsg.fd);
778 break;
779 case MSG_STDOUT:
780 if (datalen != 0)
781 fatalx("bad MSG_STDOUT size");
782 if (imsg.fd == -1)
783 fatalx("MSG_STDOUT missing fd");
784
785 c->stdout_fd = imsg.fd;
786 c->stdout_event = bufferevent_new(c->stdout_fd,
787 NULL, NULL, server_client_out_callback, c);
788 if (c->stdout_event == NULL)
789 fatalx("failed to create stdout event");
790 setblocking(c->stdout_fd, 0);
791
792 break;
793 case MSG_STDERR:
794 if (datalen != 0)
795 fatalx("bad MSG_STDERR size");
796 if (imsg.fd == -1)
797 fatalx("MSG_STDERR missing fd");
798
799 c->stderr_fd = imsg.fd;
800 c->stderr_event = bufferevent_new(c->stderr_fd,
801 NULL, NULL, server_client_err_callback, c);
802 if (c->stderr_event == NULL)
803 fatalx("failed to create stderr event");
804 setblocking(c->stderr_fd, 0);
805
806 break;
807 case MSG_RESIZE:
808 if (datalen != 0)
809 fatalx("bad MSG_RESIZE size");
810
811 if (tty_resize(&c->tty)) {
812 recalculate_sizes();
813 server_redraw_client(c);
814 }
815 break;
816 case MSG_EXITING:
817 if (datalen != 0)
818 fatalx("bad MSG_EXITING size");
819
820 c->session = NULL;
821 tty_close(&c->tty);
822 server_write_client(c, MSG_EXITED, NULL, 0);
823 break;
824 case MSG_WAKEUP:
825 case MSG_UNLOCK:
826 if (datalen != 0)
827 fatalx("bad MSG_WAKEUP size");
828
829 if (!(c->flags & CLIENT_SUSPENDED))
830 break;
831 c->flags &= ~CLIENT_SUSPENDED;
832
833 if (gettimeofday(&c->activity_time, NULL) != 0)
834 fatal("gettimeofday");
835 if (c->session != NULL)
836 session_update_activity(c->session);
837
838 tty_start_tty(&c->tty);
839 server_redraw_client(c);
840 recalculate_sizes();
841 break;
842 case MSG_ENVIRON:
843 if (datalen != sizeof environdata)
844 fatalx("bad MSG_ENVIRON size");
845 memcpy(&environdata, imsg.data, sizeof environdata);
846
847 environdata.var[(sizeof environdata.var) - 1] = '\0';
848 if (strchr(environdata.var, '=') != NULL)
849 environ_put(&c->environ, environdata.var);
850 break;
851 case MSG_SHELL:
852 if (datalen != 0)
853 fatalx("bad MSG_SHELL size");
854
855 server_client_msg_shell(c);
856 break;
857 default:
858 fatalx("unexpected message");
859 }
860
861 imsg_free(&imsg);
862 }
863 }
864
865 /* Callback to send error message to client. */
866 void printflike2
867 server_client_msg_error(struct cmd_ctx *ctx, const char *fmt, ...)
868 {
869 va_list ap;
870
871 va_start(ap, fmt);
872 evbuffer_add_vprintf(ctx->cmdclient->stderr_event->output, fmt, ap);
873 va_end(ap);
874
875 bufferevent_write(ctx->cmdclient->stderr_event, "\n", 1);
876 ctx->cmdclient->retcode = 1;
877 }
878
879 /* Callback to send print message to client. */
880 void printflike2
881 server_client_msg_print(struct cmd_ctx *ctx, const char *fmt, ...)
882 {
883 va_list ap;
884
885 va_start(ap, fmt);
886 evbuffer_add_vprintf(ctx->cmdclient->stdout_event->output, fmt, ap);
887 va_end(ap);
888
889 bufferevent_write(ctx->cmdclient->stdout_event, "\n", 1);
890 }
891
892 /* Callback to send print message to client, if not quiet. */
893 void printflike2
894 server_client_msg_info(struct cmd_ctx *ctx, const char *fmt, ...)
895 {
896 va_list ap;
897
898 if (options_get_number(&global_options, "quiet"))
899 return;
900
901 va_start(ap, fmt);
902 evbuffer_add_vprintf(ctx->cmdclient->stdout_event->output, fmt, ap);
903 va_end(ap);
904
905 bufferevent_write(ctx->cmdclient->stdout_event, "\n", 1);
906 }
907
908 /* Handle command message. */
909 void
910 server_client_msg_command(struct client *c, struct msg_command_data *data)
911 {
912 struct cmd_ctx ctx;
913 struct cmd_list *cmdlist = NULL;
914 int argc;
915 char **argv, *cause;
916
917 ctx.error = server_client_msg_error;
918 ctx.print = server_client_msg_print;
919 ctx.info = server_client_msg_info;
920
921 ctx.msgdata = data;
922 ctx.curclient = NULL;
923
924 ctx.cmdclient = c;
925
926 argc = data->argc;
927 data->argv[(sizeof data->argv) - 1] = '\0';
928 if (cmd_unpack_argv(data->argv, sizeof data->argv, argc, &argv) != 0) {
929 server_client_msg_error(&ctx, "command too long");
930 goto error;
931 }
932
933 if (argc == 0) {
934 argc = 1;
935 argv = xcalloc(1, sizeof *argv);
936 *argv = xstrdup("new-session");
937 }
938
939 if ((cmdlist = cmd_list_parse(argc, argv, &cause)) == NULL) {
940 server_client_msg_error(&ctx, "%s", cause);
941 cmd_free_argv(argc, argv);
942 goto error;
943 }
944 cmd_free_argv(argc, argv);
945
946 if (cmd_list_exec(cmdlist, &ctx) != 1)
947 c->flags |= CLIENT_EXIT;
948 cmd_list_free(cmdlist);
949 return;
950
951 error:
952 if (cmdlist != NULL)
953 cmd_list_free(cmdlist);
954 c->flags |= CLIENT_EXIT;
955 }
956
957 /* Handle identify message. */
958 void
959 server_client_msg_identify(
960 struct client *c, struct msg_identify_data *data, int fd)
961 {
962 int tty_fd;
963
964 c->cwd = NULL;
965 data->cwd[(sizeof data->cwd) - 1] = '\0';
966 if (*data->cwd != '\0')
967 c->cwd = xstrdup(data->cwd);
968
969 if (!isatty(fd))
970 return;
971 if ((tty_fd = dup(fd)) == -1)
972 fatal("dup failed");
973 data->term[(sizeof data->term) - 1] = '\0';
974 tty_init(&c->tty, tty_fd, data->term);
975 if (data->flags & IDENTIFY_UTF8)
976 c->tty.flags |= TTY_UTF8;
977 if (data->flags & IDENTIFY_256COLOURS)
978 c->tty.term_flags |= TERM_256COLOURS;
979 else if (data->flags & IDENTIFY_88COLOURS)
980 c->tty.term_flags |= TERM_88COLOURS;
981 c->tty.key_callback = server_client_handle_key;
982 c->tty.key_data = c;
983
984 tty_resize(&c->tty);
985
986 c->flags |= CLIENT_TERMINAL;
987 }
988
989 /* Handle shell message. */
990 void
991 server_client_msg_shell(struct client *c)
992 {
993 struct msg_shell_data data;
994 const char *shell;
995
996 shell = options_get_string(&global_s_options, "default-shell");
997
998 if (*shell == '\0' || areshell(shell))
999 shell = _PATH_BSHELL;
1000 if (strlcpy(data.shell, shell, sizeof data.shell) >= sizeof data.shell)
1001 strlcpy(data.shell, _PATH_BSHELL, sizeof data.shell);
1002
1003 server_write_client(c, MSG_SHELL, &data, sizeof data);
1004 c->flags |= CLIENT_BAD; /* it will die after exec */
1005 }