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1.4 ! nicm 1: /* $OpenBSD: server-client.c,v 1.3 2009/10/22 21:01:52 nicm Exp $ */
1.1 nicm 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 <fcntl.h>
22: #include <string.h>
1.4 ! nicm 23: #include <time.h>
1.1 nicm 24: #include <paths.h>
25: #include <unistd.h>
26:
27: #include "tmux.h"
28:
29: void server_client_handle_data(struct client *);
30: void server_client_check_redraw(struct client *);
31: void server_client_set_title(struct client *);
32: void server_client_check_timers(struct client *);
33:
34: int server_client_msg_dispatch(struct client *);
35: void server_client_msg_command(struct client *, struct msg_command_data *);
36: void server_client_msg_identify(
37: struct client *, struct msg_identify_data *, int);
38: void server_client_msg_shell(struct client *);
39:
40: void printflike2 server_client_msg_error(struct cmd_ctx *, const char *, ...);
41: void printflike2 server_client_msg_print(struct cmd_ctx *, const char *, ...);
42: void printflike2 server_client_msg_info(struct cmd_ctx *, const char *, ...);
43:
44:
45: /* Create a new client. */
46: void
47: server_client_create(int fd)
48: {
49: struct client *c;
50: int mode;
51: u_int i;
52:
53: if ((mode = fcntl(fd, F_GETFL)) == -1)
54: fatal("fcntl failed");
55: if (fcntl(fd, F_SETFL, mode|O_NONBLOCK) == -1)
56: fatal("fcntl failed");
57: if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
58: fatal("fcntl failed");
59:
60: c = xcalloc(1, sizeof *c);
61: c->references = 0;
62: imsg_init(&c->ibuf, fd);
63:
64: if (gettimeofday(&c->tv, NULL) != 0)
65: fatal("gettimeofday failed");
66:
67: ARRAY_INIT(&c->prompt_hdata);
68:
69: c->tty.fd = -1;
70: c->title = NULL;
71:
72: c->session = NULL;
73: c->tty.sx = 80;
74: c->tty.sy = 24;
75:
76: screen_init(&c->status, c->tty.sx, 1, 0);
77: job_tree_init(&c->status_jobs);
78:
79: c->message_string = NULL;
80:
81: c->prompt_string = NULL;
82: c->prompt_buffer = NULL;
83: c->prompt_index = 0;
84:
85: for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
86: if (ARRAY_ITEM(&clients, i) == NULL) {
87: ARRAY_SET(&clients, i, c);
88: return;
89: }
90: }
91: ARRAY_ADD(&clients, c);
92: log_debug("new client %d", fd);
93: }
94:
95: /* Lost a client. */
96: void
97: server_client_lost(struct client *c)
98: {
99: u_int i;
100:
101: for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
102: if (ARRAY_ITEM(&clients, i) == c)
103: ARRAY_SET(&clients, i, NULL);
104: }
105: log_debug("lost client %d", c->ibuf.fd);
106:
107: /*
108: * If CLIENT_TERMINAL hasn't been set, then tty_init hasn't been called
109: * and tty_free might close an unrelated fd.
110: */
111: if (c->flags & CLIENT_TERMINAL)
112: tty_free(&c->tty);
113:
114: screen_free(&c->status);
115: job_tree_free(&c->status_jobs);
116:
117: if (c->title != NULL)
118: xfree(c->title);
119:
120: if (c->message_string != NULL)
121: xfree(c->message_string);
122:
123: if (c->prompt_string != NULL)
124: xfree(c->prompt_string);
125: if (c->prompt_buffer != NULL)
126: xfree(c->prompt_buffer);
127: for (i = 0; i < ARRAY_LENGTH(&c->prompt_hdata); i++)
128: xfree(ARRAY_ITEM(&c->prompt_hdata, i));
129: ARRAY_FREE(&c->prompt_hdata);
130:
131: if (c->cwd != NULL)
132: xfree(c->cwd);
133:
134: close(c->ibuf.fd);
135: imsg_clear(&c->ibuf);
136:
137: for (i = 0; i < ARRAY_LENGTH(&dead_clients); i++) {
138: if (ARRAY_ITEM(&dead_clients, i) == NULL) {
139: ARRAY_SET(&dead_clients, i, c);
140: break;
141: }
142: }
143: if (i == ARRAY_LENGTH(&dead_clients))
144: ARRAY_ADD(&dead_clients, c);
145: c->flags |= CLIENT_DEAD;
146:
147: recalculate_sizes();
148: }
149:
150: /* Process a single client event. */
151: void
152: server_client_callback(int fd, int events, void *data)
153: {
154: struct client *c = data;
155:
156: if (fd == c->ibuf.fd) {
157: if (events & (POLLERR|POLLNVAL|POLLHUP))
158: goto client_lost;
159:
160: if (events & POLLOUT && msgbuf_write(&c->ibuf.w) < 0)
161: goto client_lost;
162:
163: if (c->flags & CLIENT_BAD) {
164: if (c->ibuf.w.queued == 0)
165: goto client_lost;
166: return;
167: }
168:
169: if (events & POLLIN && server_client_msg_dispatch(c) != 0)
170: goto client_lost;
171: }
172:
173: if (c->tty.fd != -1 && fd == c->tty.fd) {
174: if (c->flags & CLIENT_SUSPENDED || c->session == NULL)
175: return;
176:
177: if (buffer_poll(fd, events, c->tty.in, c->tty.out) != 0)
178: goto client_lost;
179: }
180:
181: return;
182:
183: client_lost:
184: server_client_lost(c);
185: }
186:
1.2 nicm 187: /* Client functions that need to happen every loop. */
188: void
189: server_client_loop(void)
190: {
191: struct client *c;
192: struct window *w;
193: struct window_pane *wp;
194: u_int i;
195:
196: for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
197: c = ARRAY_ITEM(&clients, i);
198: if (c == NULL || c->session == NULL)
199: continue;
200:
1.3 nicm 201: server_client_handle_data(c);
202:
1.2 nicm 203: server_client_check_timers(c);
204: server_client_check_redraw(c);
205: }
206:
207: /*
208: * Any windows will have been redrawn as part of clients, so clear
209: * their flags now.
210: */
211: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
212: w = ARRAY_ITEM(&windows, i);
213: if (w == NULL)
214: continue;
215:
216: w->flags &= ~WINDOW_REDRAW;
217: TAILQ_FOREACH(wp, &w->panes, entry)
218: wp->flags &= ~PANE_REDRAW;
219: }
220: }
221:
222: /* Handle data input or output from client. */
1.1 nicm 223: void
224: server_client_handle_data(struct client *c)
225: {
226: struct window *w;
227: struct window_pane *wp;
228: struct screen *s;
229: struct options *oo;
230: struct timeval tv;
231: struct key_binding *bd;
232: struct keylist *keylist;
233: struct mouse_event mouse;
234: int key, status, xtimeout, mode, isprefix;
235: u_int i;
236:
237: xtimeout = options_get_number(&c->session->options, "repeat-time");
238: if (xtimeout != 0 && c->flags & CLIENT_REPEAT) {
239: if (gettimeofday(&tv, NULL) != 0)
240: fatal("gettimeofday failed");
241: if (timercmp(&tv, &c->repeat_timer, >))
242: c->flags &= ~(CLIENT_PREFIX|CLIENT_REPEAT);
243: }
244:
245: /* Process keys. */
246: keylist = options_get_data(&c->session->options, "prefix");
247: while (tty_keys_next(&c->tty, &key, &mouse) == 0) {
248: if (c->session == NULL)
249: return;
250:
251: c->session->activity = time(NULL);
252: w = c->session->curw->window;
253: wp = w->active; /* could die */
254: oo = &c->session->options;
255:
256: /* Special case: number keys jump to pane in identify mode. */
257: if (c->flags & CLIENT_IDENTIFY && key >= '0' && key <= '9') {
258: wp = window_pane_at_index(w, key - '0');
259: if (wp != NULL && window_pane_visible(wp))
260: window_set_active_pane(w, wp);
261: server_clear_identify(c);
262: continue;
263: }
264:
265: status_message_clear(c);
266: server_clear_identify(c);
267: if (c->prompt_string != NULL) {
268: status_prompt_key(c, key);
269: continue;
270: }
271:
272: /* Check for mouse keys. */
273: if (key == KEYC_MOUSE) {
274: if (options_get_number(oo, "mouse-select-pane")) {
275: window_set_active_at(w, mouse.x, mouse.y);
276: wp = w->active;
277: }
278: window_pane_mouse(wp, c, &mouse);
279: continue;
280: }
281:
282: /* Is this a prefix key? */
283: isprefix = 0;
284: for (i = 0; i < ARRAY_LENGTH(keylist); i++) {
285: if (key == ARRAY_ITEM(keylist, i)) {
286: isprefix = 1;
287: break;
288: }
289: }
290:
291: /* No previous prefix key. */
292: if (!(c->flags & CLIENT_PREFIX)) {
293: if (isprefix)
294: c->flags |= CLIENT_PREFIX;
295: else {
296: /* Try as a non-prefix key binding. */
297: if ((bd = key_bindings_lookup(key)) == NULL)
298: window_pane_key(wp, c, key);
299: else
300: key_bindings_dispatch(bd, c);
301: }
302: continue;
303: }
304:
305: /* Prefix key already pressed. Reset prefix and lookup key. */
306: c->flags &= ~CLIENT_PREFIX;
307: if ((bd = key_bindings_lookup(key | KEYC_PREFIX)) == NULL) {
308: /* If repeating, treat this as a key, else ignore. */
309: if (c->flags & CLIENT_REPEAT) {
310: c->flags &= ~CLIENT_REPEAT;
311: if (isprefix)
312: c->flags |= CLIENT_PREFIX;
313: else
314: window_pane_key(wp, c, key);
315: }
316: continue;
317: }
318:
319: /* If already repeating, but this key can't repeat, skip it. */
320: if (c->flags & CLIENT_REPEAT && !bd->can_repeat) {
321: c->flags &= ~CLIENT_REPEAT;
322: if (isprefix)
323: c->flags |= CLIENT_PREFIX;
324: else
325: window_pane_key(wp, c, key);
326: continue;
327: }
328:
329: /* If this key can repeat, reset the repeat flags and timer. */
330: if (xtimeout != 0 && bd->can_repeat) {
331: c->flags |= CLIENT_PREFIX|CLIENT_REPEAT;
332:
333: tv.tv_sec = xtimeout / 1000;
334: tv.tv_usec = (xtimeout % 1000) * 1000L;
335: if (gettimeofday(&c->repeat_timer, NULL) != 0)
336: fatal("gettimeofday failed");
337: timeradd(&c->repeat_timer, &tv, &c->repeat_timer);
338: }
339:
340: /* Dispatch the command. */
341: key_bindings_dispatch(bd, c);
342: }
343: if (c->session == NULL)
344: return;
345: w = c->session->curw->window;
346: wp = w->active;
347: oo = &c->session->options;
348: s = wp->screen;
349:
350: /*
351: * Update cursor position and mode settings. The scroll region and
352: * attributes are cleared across poll(2) as this is the most likely
353: * time a user may interrupt tmux, for example with ~^Z in ssh(1). This
354: * is a compromise between excessive resets and likelihood of an
355: * interrupt.
356: *
357: * tty_region/tty_reset/tty_update_mode already take care of not
358: * resetting things that are already in their default state.
359: */
360: tty_region(&c->tty, 0, c->tty.sy - 1);
361:
362: status = options_get_number(oo, "status");
363: if (!window_pane_visible(wp) || wp->yoff + s->cy >= c->tty.sy - status)
364: tty_cursor(&c->tty, 0, 0);
365: else
366: tty_cursor(&c->tty, wp->xoff + s->cx, wp->yoff + s->cy);
367:
368: mode = s->mode;
369: if (TAILQ_NEXT(TAILQ_FIRST(&w->panes), entry) != NULL &&
370: options_get_number(oo, "mouse-select-pane"))
371: mode |= MODE_MOUSE;
372: tty_update_mode(&c->tty, mode);
373: tty_reset(&c->tty);
374: }
375:
376: /* Check for client redraws. */
377: void
378: server_client_check_redraw(struct client *c)
379: {
380: struct session *s = c->session;
381: struct window_pane *wp;
382: int flags, redraw;
383:
384: flags = c->tty.flags & TTY_FREEZE;
385: c->tty.flags &= ~TTY_FREEZE;
386:
387: if (c->flags & (CLIENT_REDRAW|CLIENT_STATUS)) {
388: if (options_get_number(&s->options, "set-titles"))
389: server_client_set_title(c);
390:
391: if (c->message_string != NULL)
392: redraw = status_message_redraw(c);
393: else if (c->prompt_string != NULL)
394: redraw = status_prompt_redraw(c);
395: else
396: redraw = status_redraw(c);
397: if (!redraw)
398: c->flags &= ~CLIENT_STATUS;
399: }
400:
401: if (c->flags & CLIENT_REDRAW) {
402: screen_redraw_screen(c, 0);
403: c->flags &= ~CLIENT_STATUS;
404: } else {
405: TAILQ_FOREACH(wp, &c->session->curw->window->panes, entry) {
406: if (wp->flags & PANE_REDRAW)
407: screen_redraw_pane(c, wp);
408: }
409: }
410:
411: if (c->flags & CLIENT_STATUS)
412: screen_redraw_screen(c, 1);
413:
414: c->tty.flags |= flags;
415:
416: c->flags &= ~(CLIENT_REDRAW|CLIENT_STATUS);
417: }
418:
419: /* Set client title. */
420: void
421: server_client_set_title(struct client *c)
422: {
423: struct session *s = c->session;
424: const char *template;
425: char *title;
426:
427: template = options_get_string(&s->options, "set-titles-string");
428:
429: title = status_replace(c, template, time(NULL));
430: if (c->title == NULL || strcmp(title, c->title) != 0) {
431: if (c->title != NULL)
432: xfree(c->title);
433: c->title = xstrdup(title);
434: tty_set_title(&c->tty, c->title);
435: }
436: xfree(title);
437: }
438:
439: /* Check client timers. */
440: void
441: server_client_check_timers(struct client *c)
442: {
443: struct session *s = c->session;
444: struct job *job;
445: struct timeval tv;
446: u_int interval;
447:
448: if (gettimeofday(&tv, NULL) != 0)
449: fatal("gettimeofday failed");
450:
451: if (c->flags & CLIENT_IDENTIFY && timercmp(&tv, &c->identify_timer, >))
452: server_clear_identify(c);
453:
454: if (c->message_string != NULL && timercmp(&tv, &c->message_timer, >))
455: status_message_clear(c);
456:
457: if (c->message_string != NULL || c->prompt_string != NULL) {
458: /*
459: * Don't need timed redraw for messages/prompts so bail now.
460: * The status timer isn't reset when they are redrawn anyway.
461: */
462: return;
463:
464: }
465: if (!options_get_number(&s->options, "status"))
466: return;
467:
468: /* Check timer; resolution is only a second so don't be too clever. */
469: interval = options_get_number(&s->options, "status-interval");
470: if (interval == 0)
471: return;
472: if (tv.tv_sec < c->status_timer.tv_sec ||
473: ((u_int) tv.tv_sec) - c->status_timer.tv_sec >= interval) {
474: /* Run the jobs for this client and schedule for redraw. */
475: RB_FOREACH(job, jobs, &c->status_jobs)
476: job_run(job);
477: c->flags |= CLIENT_STATUS;
478: }
479: }
480:
481: /* Dispatch message from client. */
482: int
483: server_client_msg_dispatch(struct client *c)
484: {
485: struct imsg imsg;
486: struct msg_command_data commanddata;
487: struct msg_identify_data identifydata;
488: struct msg_environ_data environdata;
489: ssize_t n, datalen;
490:
491: if ((n = imsg_read(&c->ibuf)) == -1 || n == 0)
492: return (-1);
493:
494: for (;;) {
495: if ((n = imsg_get(&c->ibuf, &imsg)) == -1)
496: return (-1);
497: if (n == 0)
498: return (0);
499: datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
500:
501: if (imsg.hdr.peerid != PROTOCOL_VERSION) {
502: server_write_client(c, MSG_VERSION, NULL, 0);
503: c->flags |= CLIENT_BAD;
504: imsg_free(&imsg);
505: continue;
506: }
507:
508: log_debug("got %d from client %d", imsg.hdr.type, c->ibuf.fd);
509: switch (imsg.hdr.type) {
510: case MSG_COMMAND:
511: if (datalen != sizeof commanddata)
512: fatalx("bad MSG_COMMAND size");
513: memcpy(&commanddata, imsg.data, sizeof commanddata);
514:
515: server_client_msg_command(c, &commanddata);
516: break;
517: case MSG_IDENTIFY:
518: if (datalen != sizeof identifydata)
519: fatalx("bad MSG_IDENTIFY size");
520: if (imsg.fd == -1)
521: fatalx("MSG_IDENTIFY missing fd");
522: memcpy(&identifydata, imsg.data, sizeof identifydata);
523:
524: server_client_msg_identify(c, &identifydata, imsg.fd);
525: break;
526: case MSG_RESIZE:
527: if (datalen != 0)
528: fatalx("bad MSG_RESIZE size");
529:
530: tty_resize(&c->tty);
531: recalculate_sizes();
532: server_redraw_client(c);
533: break;
534: case MSG_EXITING:
535: if (datalen != 0)
536: fatalx("bad MSG_EXITING size");
537:
538: c->session = NULL;
539: tty_close(&c->tty);
540: server_write_client(c, MSG_EXITED, NULL, 0);
541: break;
542: case MSG_WAKEUP:
543: case MSG_UNLOCK:
544: if (datalen != 0)
545: fatalx("bad MSG_WAKEUP size");
546:
547: if (!(c->flags & CLIENT_SUSPENDED))
548: break;
549: c->flags &= ~CLIENT_SUSPENDED;
550: tty_start_tty(&c->tty);
551: server_redraw_client(c);
552: recalculate_sizes();
553: if (c->session != NULL)
554: c->session->activity = time(NULL);
555: break;
556: case MSG_ENVIRON:
557: if (datalen != sizeof environdata)
558: fatalx("bad MSG_ENVIRON size");
559: memcpy(&environdata, imsg.data, sizeof environdata);
560:
561: environdata.var[(sizeof environdata.var) - 1] = '\0';
562: if (strchr(environdata.var, '=') != NULL)
563: environ_put(&c->environ, environdata.var);
564: break;
565: case MSG_SHELL:
566: if (datalen != 0)
567: fatalx("bad MSG_SHELL size");
568:
569: server_client_msg_shell(c);
570: break;
571: default:
572: fatalx("unexpected message");
573: }
574:
575: imsg_free(&imsg);
576: }
577: }
578:
579: /* Callback to send error message to client. */
580: void printflike2
581: server_client_msg_error(struct cmd_ctx *ctx, const char *fmt, ...)
582: {
583: struct msg_print_data data;
584: va_list ap;
585:
586: va_start(ap, fmt);
587: xvsnprintf(data.msg, sizeof data.msg, fmt, ap);
588: va_end(ap);
589:
590: server_write_client(ctx->cmdclient, MSG_ERROR, &data, sizeof data);
591: }
592:
593: /* Callback to send print message to client. */
594: void printflike2
595: server_client_msg_print(struct cmd_ctx *ctx, const char *fmt, ...)
596: {
597: struct msg_print_data data;
598: va_list ap;
599:
600: va_start(ap, fmt);
601: xvsnprintf(data.msg, sizeof data.msg, fmt, ap);
602: va_end(ap);
603:
604: server_write_client(ctx->cmdclient, MSG_PRINT, &data, sizeof data);
605: }
606:
607: /* Callback to send print message to client, if not quiet. */
608: void printflike2
609: server_client_msg_info(struct cmd_ctx *ctx, const char *fmt, ...)
610: {
611: struct msg_print_data data;
612: va_list ap;
613:
614: if (be_quiet)
615: return;
616:
617: va_start(ap, fmt);
618: xvsnprintf(data.msg, sizeof data.msg, fmt, ap);
619: va_end(ap);
620:
621: server_write_client(ctx->cmdclient, MSG_PRINT, &data, sizeof data);
622: }
623:
624: /* Handle command message. */
625: void
626: server_client_msg_command(struct client *c, struct msg_command_data *data)
627: {
628: struct cmd_ctx ctx;
629: struct cmd_list *cmdlist = NULL;
630: struct cmd *cmd;
631: int argc;
632: char **argv, *cause;
633:
634: if (c->session != NULL)
635: c->session->activity = time(NULL);
636:
637: ctx.error = server_client_msg_error;
638: ctx.print = server_client_msg_print;
639: ctx.info = server_client_msg_info;
640:
641: ctx.msgdata = data;
642: ctx.curclient = NULL;
643:
644: ctx.cmdclient = c;
645:
646: argc = data->argc;
647: data->argv[(sizeof data->argv) - 1] = '\0';
648: if (cmd_unpack_argv(data->argv, sizeof data->argv, argc, &argv) != 0) {
649: server_client_msg_error(&ctx, "command too long");
650: goto error;
651: }
652:
653: if (argc == 0) {
654: argc = 1;
655: argv = xcalloc(1, sizeof *argv);
656: *argv = xstrdup("new-session");
657: }
658:
659: if ((cmdlist = cmd_list_parse(argc, argv, &cause)) == NULL) {
660: server_client_msg_error(&ctx, "%s", cause);
661: cmd_free_argv(argc, argv);
662: goto error;
663: }
664: cmd_free_argv(argc, argv);
665:
666: if (data->pid != -1) {
667: TAILQ_FOREACH(cmd, cmdlist, qentry) {
668: if (cmd->entry->flags & CMD_CANTNEST) {
669: server_client_msg_error(&ctx,
670: "sessions should be nested with care. "
671: "unset $TMUX to force");
672: goto error;
673: }
674: }
675: }
676:
677: if (cmd_list_exec(cmdlist, &ctx) != 1)
678: server_write_client(c, MSG_EXIT, NULL, 0);
679: cmd_list_free(cmdlist);
680: return;
681:
682: error:
683: if (cmdlist != NULL)
684: cmd_list_free(cmdlist);
685: server_write_client(c, MSG_EXIT, NULL, 0);
686: }
687:
688: /* Handle identify message. */
689: void
690: server_client_msg_identify(
691: struct client *c, struct msg_identify_data *data, int fd)
692: {
693: c->cwd = NULL;
694: data->cwd[(sizeof data->cwd) - 1] = '\0';
695: if (*data->cwd != '\0')
696: c->cwd = xstrdup(data->cwd);
697:
698: data->term[(sizeof data->term) - 1] = '\0';
699: tty_init(&c->tty, fd, data->term);
700: if (data->flags & IDENTIFY_UTF8)
701: c->tty.flags |= TTY_UTF8;
702: if (data->flags & IDENTIFY_256COLOURS)
703: c->tty.term_flags |= TERM_256COLOURS;
704: else if (data->flags & IDENTIFY_88COLOURS)
705: c->tty.term_flags |= TERM_88COLOURS;
706: if (data->flags & IDENTIFY_HASDEFAULTS)
707: c->tty.term_flags |= TERM_HASDEFAULTS;
708:
709: tty_resize(&c->tty);
710:
711: c->flags |= CLIENT_TERMINAL;
712: }
713:
714: /* Handle shell message. */
715: void
716: server_client_msg_shell(struct client *c)
717: {
718: struct msg_shell_data data;
719: const char *shell;
720:
721: shell = options_get_string(&global_s_options, "default-shell");
722:
723: if (*shell == '\0' || areshell(shell))
724: shell = _PATH_BSHELL;
725: if (strlcpy(data.shell, shell, sizeof data.shell) >= sizeof data.shell)
726: strlcpy(data.shell, _PATH_BSHELL, sizeof data.shell);
727:
728: server_write_client(c, MSG_SHELL, &data, sizeof data);
729: c->flags |= CLIENT_BAD; /* it will die after exec */
730: }