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Change the way the working directory for new processes is discovered. If
[tmux-openbsd.git] / server-client.c
blobcf2a4c546204841dbadef6672d5846161fb3a933
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 struct keylist *keylist;
277 int xtimeout, isprefix;
278 u_int i;
279
280 /* Check the client is good to accept input. */
281 if ((c->flags & (CLIENT_DEAD|CLIENT_SUSPENDED)) != 0)
282 return;
283 if (c->session == NULL)
284 return;
285 s = c->session;
286
287 /* Update the activity timer. */
288 if (gettimeofday(&c->activity_time, NULL) != 0)
289 fatal("gettimeofday failed");
290 memcpy(&s->activity_time, &c->activity_time, sizeof s->activity_time);
291
292 w = c->session->curw->window;
293 wp = w->active;
294 oo = &c->session->options;
295
296 /* Special case: number keys jump to pane in identify mode. */
297 if (c->flags & CLIENT_IDENTIFY && key >= '0' && key <= '9') {
298 if (c->flags & CLIENT_READONLY)
299 return;
300 wp = window_pane_at_index(w, key - '0');
301 if (wp != NULL && window_pane_visible(wp))
302 window_set_active_pane(w, wp);
303 server_clear_identify(c);
304 return;
305 }
306
307 /* Handle status line. */
308 if (!(c->flags & CLIENT_READONLY)) {
309 status_message_clear(c);
310 server_clear_identify(c);
311 }
312 if (c->prompt_string != NULL) {
313 if (!(c->flags & CLIENT_READONLY))
314 status_prompt_key(c, key);
315 return;
316 }
317
318 /* Check for mouse keys. */
319 if (key == KEYC_MOUSE) {
320 if (c->flags & CLIENT_READONLY)
321 return;
322 if (options_get_number(oo, "mouse-select-pane") &&
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 keylist = options_get_data(&c->session->options, "prefix");
362 isprefix = 0;
363 for (i = 0; i < ARRAY_LENGTH(keylist); i++) {
364 if (key == ARRAY_ITEM(keylist, i)) {
365 isprefix = 1;
366 break;
367 }
368 }
369
370 /* No previous prefix key. */
371 if (!(c->flags & CLIENT_PREFIX)) {
372 if (isprefix)
373 c->flags |= CLIENT_PREFIX;
374 else {
375 /* Try as a non-prefix key binding. */
376 if ((bd = key_bindings_lookup(key)) == NULL) {
377 if (!(c->flags & CLIENT_READONLY))
378 window_pane_key(wp, c->session, key);
379 } else
380 key_bindings_dispatch(bd, c);
381 }
382 return;
383 }
384
385 /* Prefix key already pressed. Reset prefix and lookup key. */
386 c->flags &= ~CLIENT_PREFIX;
387 if ((bd = key_bindings_lookup(key | KEYC_PREFIX)) == NULL) {
388 /* If repeating, treat this as a key, else ignore. */
389 if (c->flags & CLIENT_REPEAT) {
390 c->flags &= ~CLIENT_REPEAT;
391 if (isprefix)
392 c->flags |= CLIENT_PREFIX;
393 else if (!(c->flags & CLIENT_READONLY))
394 window_pane_key(wp, c->session, key);
395 }
396 return;
397 }
398
399 /* If already repeating, but this key can't repeat, skip it. */
400 if (c->flags & CLIENT_REPEAT && !bd->can_repeat) {
401 c->flags &= ~CLIENT_REPEAT;
402 if (isprefix)
403 c->flags |= CLIENT_PREFIX;
404 else if (!(c->flags & CLIENT_READONLY))
405 window_pane_key(wp, c->session, key);
406 return;
407 }
408
409 /* If this key can repeat, reset the repeat flags and timer. */
410 xtimeout = options_get_number(&c->session->options, "repeat-time");
411 if (xtimeout != 0 && bd->can_repeat) {
412 c->flags |= CLIENT_PREFIX|CLIENT_REPEAT;
413
414 tv.tv_sec = xtimeout / 1000;
415 tv.tv_usec = (xtimeout % 1000) * 1000L;
416 evtimer_del(&c->repeat_timer);
417 evtimer_add(&c->repeat_timer, &tv);
418 }
419
420 /* Dispatch the command. */
421 key_bindings_dispatch(bd, c);
422 }
423
424 /* Client functions that need to happen every loop. */
425 void
426 server_client_loop(void)
427 {
428 struct client *c;
429 struct window *w;
430 struct window_pane *wp;
431 u_int i;
432
433 for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
434 c = ARRAY_ITEM(&clients, i);
435 if (c == NULL)
436 continue;
437
438 server_client_check_exit(c);
439 if (c->session != NULL) {
440 server_client_check_redraw(c);
441 server_client_reset_state(c);
442 }
443 }
444
445 /*
446 * Any windows will have been redrawn as part of clients, so clear
447 * their flags now.
448 */
449 for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
450 w = ARRAY_ITEM(&windows, i);
451 if (w == NULL)
452 continue;
453
454 w->flags &= ~WINDOW_REDRAW;
455 TAILQ_FOREACH(wp, &w->panes, entry)
456 wp->flags &= ~PANE_REDRAW;
457 }
458 }
459
460 /*
461 * Update cursor position and mode settings. The scroll region and attributes
462 * are cleared when idle (waiting for an event) as this is the most likely time
463 * a user may interrupt tmux, for example with ~^Z in ssh(1). This is a
464 * compromise between excessive resets and likelihood of an interrupt.
465 *
466 * tty_region/tty_reset/tty_update_mode already take care of not resetting
467 * things that are already in their default state.
468 */
469 void
470 server_client_reset_state(struct client *c)
471 {
472 struct window *w = c->session->curw->window;
473 struct window_pane *wp = w->active;
474 struct screen *s = wp->screen;
475 struct options *oo = &c->session->options;
476 struct options *wo = &w->options;
477 int status, mode;
478
479 if (c->flags & CLIENT_SUSPENDED)
480 return;
481
482 tty_region(&c->tty, 0, c->tty.sy - 1);
483
484 status = options_get_number(oo, "status");
485 if (!window_pane_visible(wp) || wp->yoff + s->cy >= c->tty.sy - status)
486 tty_cursor(&c->tty, 0, 0);
487 else
488 tty_cursor(&c->tty, wp->xoff + s->cx, wp->yoff + s->cy);
489
490 /*
491 * Resizing panes with the mouse requires at least button mode to give
492 * a smooth appearance.
493 */
494 mode = s->mode;
495 if ((c->last_mouse.b & MOUSE_RESIZE_PANE) &&
496 !(mode & (MODE_MOUSE_BUTTON|MODE_MOUSE_ANY)))
497 mode |= MODE_MOUSE_BUTTON;
498
499 /*
500 * Any mode will do for mouse-select-pane, but set standard mode if
501 * none.
502 */
503 if ((mode & ALL_MOUSE_MODES) == 0) {
504 if (TAILQ_NEXT(TAILQ_FIRST(&w->panes), entry) != NULL &&
505 options_get_number(oo, "mouse-select-pane"))
506 mode |= MODE_MOUSE_STANDARD;
507 else if (options_get_number(oo, "mouse-resize-pane"))
508 mode |= MODE_MOUSE_STANDARD;
509 else if (options_get_number(oo, "mouse-select-window"))
510 mode |= MODE_MOUSE_STANDARD;
511 else if (options_get_number(wo, "mode-mouse"))
512 mode |= MODE_MOUSE_STANDARD;
513 }
514
515 /*
516 * Set UTF-8 mouse input if required. If the terminal is UTF-8, the
517 * user has set mouse-utf8 and any mouse mode is in effect, turn on
518 * UTF-8 mouse input. If the receiving terminal hasn't requested it
519 * (that is, it isn't in s->mode), then it'll be converted in
520 * input_mouse.
521 */
522 if ((c->tty.flags & TTY_UTF8) &&
523 (mode & ALL_MOUSE_MODES) && options_get_number(oo, "mouse-utf8"))
524 mode |= MODE_MOUSE_UTF8;
525 else
526 mode &= ~MODE_MOUSE_UTF8;
527
528 /* Set the terminal mode and reset attributes. */
529 tty_update_mode(&c->tty, mode, s);
530 tty_reset(&c->tty);
531 }
532
533 /* Repeat time callback. */
534 /* ARGSUSED */
535 void
536 server_client_repeat_timer(unused int fd, unused short events, void *data)
537 {
538 struct client *c = data;
539
540 if (c->flags & CLIENT_REPEAT)
541 c->flags &= ~(CLIENT_PREFIX|CLIENT_REPEAT);
542 }
543
544 /* Check if client should be exited. */
545 void
546 server_client_check_exit(struct client *c)
547 {
548 struct msg_exit_data exitdata;
549
550 if (!(c->flags & CLIENT_EXIT))
551 return;
552
553 if (c->stdout_fd != -1 && c->stdout_event != NULL &&
554 EVBUFFER_LENGTH(c->stdout_event->output) != 0)
555 return;
556 if (c->stderr_fd != -1 && c->stderr_event != NULL &&
557 EVBUFFER_LENGTH(c->stderr_event->output) != 0)
558 return;
559
560 exitdata.retcode = c->retcode;
561 server_write_client(c, MSG_EXIT, &exitdata, sizeof exitdata);
562
563 c->flags &= ~CLIENT_EXIT;
564 }
565
566 /*
567 * Check if the client should backoff. During backoff, data from external
568 * programs is not written to the terminal. When the existing data drains, the
569 * client is redrawn.
570 *
571 * There are two backoff phases - both the tty and client have backoff flags -
572 * the first to allow existing data to drain and the latter to ensure backoff
573 * is disabled until the redraw has finished and prevent the redraw triggering
574 * another backoff.
575 */
576 void
577 server_client_check_backoff(struct client *c)
578 {
579 struct tty *tty = &c->tty;
580 size_t used;
581
582 used = EVBUFFER_LENGTH(tty->event->output);
583
584 /*
585 * If in the second backoff phase (redrawing), don't check backoff
586 * until the redraw has completed (or enough of it to drop below the
587 * backoff threshold).
588 */
589 if (c->flags & CLIENT_BACKOFF) {
590 if (used > BACKOFF_THRESHOLD)
591 return;
592 c->flags &= ~CLIENT_BACKOFF;
593 return;
594 }
595
596 /* Once drained, allow data through again and schedule redraw. */
597 if (tty->flags & TTY_BACKOFF) {
598 if (used != 0)
599 return;
600 tty->flags &= ~TTY_BACKOFF;
601 c->flags |= (CLIENT_BACKOFF|CLIENT_REDRAWWINDOW|CLIENT_STATUS);
602 return;
603 }
604
605 /* If too much data, start backoff. */
606 if (used > BACKOFF_THRESHOLD)
607 tty->flags |= TTY_BACKOFF;
608 }
609
610 /* Check for client redraws. */
611 void
612 server_client_check_redraw(struct client *c)
613 {
614 struct session *s = c->session;
615 struct window_pane *wp;
616 int flags, redraw;
617
618 flags = c->tty.flags & TTY_FREEZE;
619 c->tty.flags &= ~TTY_FREEZE;
620
621 if (c->flags & (CLIENT_REDRAW|CLIENT_STATUS)) {
622 if (options_get_number(&s->options, "set-titles"))
623 server_client_set_title(c);
624
625 if (c->message_string != NULL)
626 redraw = status_message_redraw(c);
627 else if (c->prompt_string != NULL)
628 redraw = status_prompt_redraw(c);
629 else
630 redraw = status_redraw(c);
631 if (!redraw)
632 c->flags &= ~CLIENT_STATUS;
633 }
634
635 if (c->flags & CLIENT_REDRAW) {
636 screen_redraw_screen(c, 0, 0);
637 c->flags &= ~(CLIENT_STATUS|CLIENT_BORDERS);
638 } else if (c->flags & CLIENT_REDRAWWINDOW) {
639 TAILQ_FOREACH(wp, &c->session->curw->window->panes, entry)
640 screen_redraw_pane(c, wp);
641 c->flags &= ~CLIENT_REDRAWWINDOW;
642 } else {
643 TAILQ_FOREACH(wp, &c->session->curw->window->panes, entry) {
644 if (wp->flags & PANE_REDRAW)
645 screen_redraw_pane(c, wp);
646 }
647 }
648
649 if (c->flags & CLIENT_BORDERS)
650 screen_redraw_screen(c, 0, 1);
651
652 if (c->flags & CLIENT_STATUS)
653 screen_redraw_screen(c, 1, 0);
654
655 c->tty.flags |= flags;
656
657 c->flags &= ~(CLIENT_REDRAW|CLIENT_STATUS|CLIENT_BORDERS);
658 }
659
660 /* Set client title. */
661 void
662 server_client_set_title(struct client *c)
663 {
664 struct session *s = c->session;
665 const char *template;
666 char *title;
667
668 template = options_get_string(&s->options, "set-titles-string");
669
670 title = status_replace(c, NULL, NULL, NULL, template, time(NULL), 1);
671 if (c->title == NULL || strcmp(title, c->title) != 0) {
672 if (c->title != NULL)
673 xfree(c->title);
674 c->title = xstrdup(title);
675 tty_set_title(&c->tty, c->title);
676 }
677 xfree(title);
678 }
679
680 /*
681 * Error callback for client stdin. Caller must increase reference count when
682 * enabling event!
683 */
684 void
685 server_client_in_callback(
686 unused struct bufferevent *bufev, unused short what, void *data)
687 {
688 struct client *c = data;
689
690 c->references--;
691 if (c->flags & CLIENT_DEAD)
692 return;
693
694 bufferevent_disable(c->stdin_event, EV_READ|EV_WRITE);
695 setblocking(c->stdin_fd, 1);
696 close(c->stdin_fd);
697 c->stdin_fd = -1;
698
699 if (c->stdin_callback != NULL)
700 c->stdin_callback(c, c->stdin_data);
701 }
702
703 /* Error callback for client stdout. */
704 void
705 server_client_out_callback(
706 unused struct bufferevent *bufev, unused short what, unused void *data)
707 {
708 struct client *c = data;
709
710 bufferevent_disable(c->stdout_event, EV_READ|EV_WRITE);
711 setblocking(c->stdout_fd, 1);
712 close(c->stdout_fd);
713 c->stdout_fd = -1;
714 }
715
716 /* Error callback for client stderr. */
717 void
718 server_client_err_callback(
719 unused struct bufferevent *bufev, unused short what, unused void *data)
720 {
721 struct client *c = data;
722
723 bufferevent_disable(c->stderr_event, EV_READ|EV_WRITE);
724 setblocking(c->stderr_fd, 1);
725 close(c->stderr_fd);
726 c->stderr_fd = -1;
727 }
728
729 /* Dispatch message from client. */
730 int
731 server_client_msg_dispatch(struct client *c)
732 {
733 struct imsg imsg;
734 struct msg_command_data commanddata;
735 struct msg_identify_data identifydata;
736 struct msg_environ_data environdata;
737 ssize_t n, datalen;
738
739 if ((n = imsg_read(&c->ibuf)) == -1 || n == 0)
740 return (-1);
741
742 for (;;) {
743 if ((n = imsg_get(&c->ibuf, &imsg)) == -1)
744 return (-1);
745 if (n == 0)
746 return (0);
747 datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
748
749 if (imsg.hdr.peerid != PROTOCOL_VERSION) {
750 server_write_client(c, MSG_VERSION, NULL, 0);
751 c->flags |= CLIENT_BAD;
752 imsg_free(&imsg);
753 continue;
754 }
755
756 log_debug("got %d from client %d", imsg.hdr.type, c->ibuf.fd);
757 switch (imsg.hdr.type) {
758 case MSG_COMMAND:
759 if (datalen != sizeof commanddata)
760 fatalx("bad MSG_COMMAND size");
761 memcpy(&commanddata, imsg.data, sizeof commanddata);
762
763 server_client_msg_command(c, &commanddata);
764 break;
765 case MSG_IDENTIFY:
766 if (datalen != sizeof identifydata)
767 fatalx("bad MSG_IDENTIFY size");
768 if (imsg.fd == -1)
769 fatalx("MSG_IDENTIFY missing fd");
770 memcpy(&identifydata, imsg.data, sizeof identifydata);
771
772 c->stdin_fd = imsg.fd;
773 c->stdin_event = bufferevent_new(c->stdin_fd,
774 NULL, NULL, server_client_in_callback, c);
775 if (c->stdin_event == NULL)
776 fatalx("failed to create stdin event");
777 setblocking(c->stdin_fd, 0);
778
779 server_client_msg_identify(c, &identifydata, imsg.fd);
780 break;
781 case MSG_STDOUT:
782 if (datalen != 0)
783 fatalx("bad MSG_STDOUT size");
784 if (imsg.fd == -1)
785 fatalx("MSG_STDOUT missing fd");
786
787 c->stdout_fd = imsg.fd;
788 c->stdout_event = bufferevent_new(c->stdout_fd,
789 NULL, NULL, server_client_out_callback, c);
790 if (c->stdout_event == NULL)
791 fatalx("failed to create stdout event");
792 setblocking(c->stdout_fd, 0);
793
794 break;
795 case MSG_STDERR:
796 if (datalen != 0)
797 fatalx("bad MSG_STDERR size");
798 if (imsg.fd == -1)
799 fatalx("MSG_STDERR missing fd");
800
801 c->stderr_fd = imsg.fd;
802 c->stderr_event = bufferevent_new(c->stderr_fd,
803 NULL, NULL, server_client_err_callback, c);
804 if (c->stderr_event == NULL)
805 fatalx("failed to create stderr event");
806 setblocking(c->stderr_fd, 0);
807
808 break;
809 case MSG_RESIZE:
810 if (datalen != 0)
811 fatalx("bad MSG_RESIZE size");
812
813 if (tty_resize(&c->tty)) {
814 recalculate_sizes();
815 server_redraw_client(c);
816 }
817 break;
818 case MSG_EXITING:
819 if (datalen != 0)
820 fatalx("bad MSG_EXITING size");
821
822 c->session = NULL;
823 tty_close(&c->tty);
824 server_write_client(c, MSG_EXITED, NULL, 0);
825 break;
826 case MSG_WAKEUP:
827 case MSG_UNLOCK:
828 if (datalen != 0)
829 fatalx("bad MSG_WAKEUP size");
830
831 if (!(c->flags & CLIENT_SUSPENDED))
832 break;
833 c->flags &= ~CLIENT_SUSPENDED;
834
835 if (gettimeofday(&c->activity_time, NULL) != 0)
836 fatal("gettimeofday");
837 if (c->session != NULL)
838 session_update_activity(c->session);
839
840 tty_start_tty(&c->tty);
841 server_redraw_client(c);
842 recalculate_sizes();
843 break;
844 case MSG_ENVIRON:
845 if (datalen != sizeof environdata)
846 fatalx("bad MSG_ENVIRON size");
847 memcpy(&environdata, imsg.data, sizeof environdata);
848
849 environdata.var[(sizeof environdata.var) - 1] = '\0';
850 if (strchr(environdata.var, '=') != NULL)
851 environ_put(&c->environ, environdata.var);
852 break;
853 case MSG_SHELL:
854 if (datalen != 0)
855 fatalx("bad MSG_SHELL size");
856
857 server_client_msg_shell(c);
858 break;
859 default:
860 fatalx("unexpected message");
861 }
862
863 imsg_free(&imsg);
864 }
865 }
866
867 /* Callback to send error message to client. */
868 void printflike2
869 server_client_msg_error(struct cmd_ctx *ctx, const char *fmt, ...)
870 {
871 va_list ap;
872
873 va_start(ap, fmt);
874 evbuffer_add_vprintf(ctx->cmdclient->stderr_event->output, fmt, ap);
875 va_end(ap);
876
877 bufferevent_write(ctx->cmdclient->stderr_event, "\n", 1);
878 ctx->cmdclient->retcode = 1;
879 }
880
881 /* Callback to send print message to client. */
882 void printflike2
883 server_client_msg_print(struct cmd_ctx *ctx, const char *fmt, ...)
884 {
885 va_list ap;
886
887 va_start(ap, fmt);
888 evbuffer_add_vprintf(ctx->cmdclient->stdout_event->output, fmt, ap);
889 va_end(ap);
890
891 bufferevent_write(ctx->cmdclient->stdout_event, "\n", 1);
892 }
893
894 /* Callback to send print message to client, if not quiet. */
895 void printflike2
896 server_client_msg_info(struct cmd_ctx *ctx, const char *fmt, ...)
897 {
898 va_list ap;
899
900 if (options_get_number(&global_options, "quiet"))
901 return;
902
903 va_start(ap, fmt);
904 evbuffer_add_vprintf(ctx->cmdclient->stdout_event->output, fmt, ap);
905 va_end(ap);
906
907 bufferevent_write(ctx->cmdclient->stdout_event, "\n", 1);
908 }
909
910 /* Handle command message. */
911 void
912 server_client_msg_command(struct client *c, struct msg_command_data *data)
913 {
914 struct cmd_ctx ctx;
915 struct cmd_list *cmdlist = NULL;
916 int argc;
917 char **argv, *cause;
918
919 ctx.error = server_client_msg_error;
920 ctx.print = server_client_msg_print;
921 ctx.info = server_client_msg_info;
922
923 ctx.msgdata = data;
924 ctx.curclient = NULL;
925
926 ctx.cmdclient = c;
927
928 argc = data->argc;
929 data->argv[(sizeof data->argv) - 1] = '\0';
930 if (cmd_unpack_argv(data->argv, sizeof data->argv, argc, &argv) != 0) {
931 server_client_msg_error(&ctx, "command too long");
932 goto error;
933 }
934
935 if (argc == 0) {
936 argc = 1;
937 argv = xcalloc(1, sizeof *argv);
938 *argv = xstrdup("new-session");
939 }
940
941 if ((cmdlist = cmd_list_parse(argc, argv, &cause)) == NULL) {
942 server_client_msg_error(&ctx, "%s", cause);
943 cmd_free_argv(argc, argv);
944 goto error;
945 }
946 cmd_free_argv(argc, argv);
947
948 if (cmd_list_exec(cmdlist, &ctx) != 1)
949 c->flags |= CLIENT_EXIT;
950 cmd_list_free(cmdlist);
951 return;
952
953 error:
954 if (cmdlist != NULL)
955 cmd_list_free(cmdlist);
956 c->flags |= CLIENT_EXIT;
957 }
958
959 /* Handle identify message. */
960 void
961 server_client_msg_identify(
962 struct client *c, struct msg_identify_data *data, int fd)
963 {
964 int tty_fd;
965
966 c->cwd = NULL;
967 data->cwd[(sizeof data->cwd) - 1] = '\0';
968 if (*data->cwd != '\0')
969 c->cwd = xstrdup(data->cwd);
970
971 if (!isatty(fd))
972 return;
973 if ((tty_fd = dup(fd)) == -1)
974 fatal("dup failed");
975 data->term[(sizeof data->term) - 1] = '\0';
976 tty_init(&c->tty, tty_fd, data->term);
977 if (data->flags & IDENTIFY_UTF8)
978 c->tty.flags |= TTY_UTF8;
979 if (data->flags & IDENTIFY_256COLOURS)
980 c->tty.term_flags |= TERM_256COLOURS;
981 else if (data->flags & IDENTIFY_88COLOURS)
982 c->tty.term_flags |= TERM_88COLOURS;
983 c->tty.key_callback = server_client_handle_key;
984 c->tty.key_data = c;
985
986 tty_resize(&c->tty);
987
988 c->flags |= CLIENT_TERMINAL;
989 }
990
991 /* Handle shell message. */
992 void
993 server_client_msg_shell(struct client *c)
994 {
995 struct msg_shell_data data;
996 const char *shell;
997
998 shell = options_get_string(&global_s_options, "default-shell");
999
1000 if (*shell == '\0' || areshell(shell))
1001 shell = _PATH_BSHELL;
1002 if (strlcpy(data.shell, shell, sizeof data.shell) >= sizeof data.shell)
1003 strlcpy(data.shell, _PATH_BSHELL, sizeof data.shell);
1004
1005 server_write_client(c, MSG_SHELL, &data, sizeof data);
1006 c->flags |= CLIENT_BAD; /* it will die after exec */
1007 }