1 /* $OpenBSD: server-fn.c,v 1.121 2019/05/03 20:44:24 nicm Exp $ */ 2 3 /* 4 * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com> 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 #include <sys/queue.h> 21 #include <sys/wait.h> 22 #include <sys/uio.h> 23 24 #include <imsg.h> 25 #include <stdlib.h> 26 #include <string.h> 27 #include <time.h> 28 #include <unistd.h> 29 30 #include "tmux.h" 31 32 static struct session *server_next_session(struct session *); 33 static void server_destroy_session_group(struct session *); 34 35 void 36 server_redraw_client(struct client *c) 37 { 38 c->flags |= CLIENT_ALLREDRAWFLAGS; 39 } 40 41 void 42 server_status_client(struct client *c) 43 { 44 c->flags |= CLIENT_REDRAWSTATUS; 45 } 46 47 void 48 server_redraw_session(struct session *s) 49 { 50 struct client *c; 51 52 TAILQ_FOREACH(c, &clients, entry) { 53 if (c->session == s) 54 server_redraw_client(c); 55 } 56 } 57 58 void 59 server_redraw_session_group(struct session *s) 60 { 61 struct session_group *sg; 62 63 if ((sg = session_group_contains(s)) == NULL) 64 server_redraw_session(s); 65 else { 66 TAILQ_FOREACH(s, &sg->sessions, gentry) 67 server_redraw_session(s); 68 } 69 } 70 71 void 72 server_status_session(struct session *s) 73 { 74 struct client *c; 75 76 TAILQ_FOREACH(c, &clients, entry) { 77 if (c->session == s) 78 server_status_client(c); 79 } 80 } 81 82 void 83 server_status_session_group(struct session *s) 84 { 85 struct session_group *sg; 86 87 if ((sg = session_group_contains(s)) == NULL) 88 server_status_session(s); 89 else { 90 TAILQ_FOREACH(s, &sg->sessions, gentry) 91 server_status_session(s); 92 } 93 } 94 95 void 96 server_redraw_window(struct window *w) 97 { 98 struct client *c; 99 100 TAILQ_FOREACH(c, &clients, entry) { 101 if (c->session != NULL && c->session->curw->window == w) 102 server_redraw_client(c); 103 } 104 } 105 106 void 107 server_redraw_window_borders(struct window *w) 108 { 109 struct client *c; 110 111 TAILQ_FOREACH(c, &clients, entry) { 112 if (c->session != NULL && c->session->curw->window == w) 113 c->flags |= CLIENT_REDRAWBORDERS; 114 } 115 } 116 117 void 118 server_status_window(struct window *w) 119 { 120 struct session *s; 121 122 /* 123 * This is slightly different. We want to redraw the status line of any 124 * clients containing this window rather than anywhere it is the 125 * current window. 126 */ 127 128 RB_FOREACH(s, sessions, &sessions) { 129 if (session_has(s, w)) 130 server_status_session(s); 131 } 132 } 133 134 void 135 server_lock(void) 136 { 137 struct client *c; 138 139 TAILQ_FOREACH(c, &clients, entry) { 140 if (c->session != NULL) 141 server_lock_client(c); 142 } 143 } 144 145 void 146 server_lock_session(struct session *s) 147 { 148 struct client *c; 149 150 TAILQ_FOREACH(c, &clients, entry) { 151 if (c->session == s) 152 server_lock_client(c); 153 } 154 } 155 156 void 157 server_lock_client(struct client *c) 158 { 159 const char *cmd; 160 161 if (c->flags & CLIENT_CONTROL) 162 return; 163 164 if (c->flags & CLIENT_SUSPENDED) 165 return; 166 167 cmd = options_get_string(c->session->options, "lock-command"); 168 if (*cmd == '\0' || strlen(cmd) + 1 > MAX_IMSGSIZE - IMSG_HEADER_SIZE) 169 return; 170 171 tty_stop_tty(&c->tty); 172 tty_raw(&c->tty, tty_term_string(c->tty.term, TTYC_SMCUP)); 173 tty_raw(&c->tty, tty_term_string(c->tty.term, TTYC_CLEAR)); 174 tty_raw(&c->tty, tty_term_string(c->tty.term, TTYC_E3)); 175 176 c->flags |= CLIENT_SUSPENDED; 177 proc_send(c->peer, MSG_LOCK, -1, cmd, strlen(cmd) + 1); 178 } 179 180 void 181 server_kill_pane(struct window_pane *wp) 182 { 183 struct window *w = wp->window; 184 185 if (window_count_panes(w) == 1) { 186 server_kill_window(w); 187 recalculate_sizes(); 188 } else { 189 server_unzoom_window(w); 190 layout_close_pane(wp); 191 window_remove_pane(w, wp); 192 server_redraw_window(w); 193 } 194 } 195 196 void 197 server_kill_window(struct window *w) 198 { 199 struct session *s, *next_s, *target_s; 200 struct session_group *sg; 201 struct winlink *wl; 202 203 next_s = RB_MIN(sessions, &sessions); 204 while (next_s != NULL) { 205 s = next_s; 206 next_s = RB_NEXT(sessions, &sessions, s); 207 208 if (!session_has(s, w)) 209 continue; 210 server_unzoom_window(w); 211 while ((wl = winlink_find_by_window(&s->windows, w)) != NULL) { 212 if (session_detach(s, wl)) { 213 server_destroy_session_group(s); 214 break; 215 } else 216 server_redraw_session_group(s); 217 } 218 219 if (options_get_number(s->options, "renumber-windows")) { 220 if ((sg = session_group_contains(s)) != NULL) { 221 TAILQ_FOREACH(target_s, &sg->sessions, gentry) 222 session_renumber_windows(target_s); 223 } else 224 session_renumber_windows(s); 225 } 226 } 227 recalculate_sizes(); 228 } 229 230 int 231 server_link_window(struct session *src, struct winlink *srcwl, 232 struct session *dst, int dstidx, int killflag, int selectflag, 233 char **cause) 234 { 235 struct winlink *dstwl; 236 struct session_group *srcsg, *dstsg; 237 238 srcsg = session_group_contains(src); 239 dstsg = session_group_contains(dst); 240 if (src != dst && srcsg != NULL && dstsg != NULL && srcsg == dstsg) { 241 xasprintf(cause, "sessions are grouped"); 242 return (-1); 243 } 244 245 dstwl = NULL; 246 if (dstidx != -1) 247 dstwl = winlink_find_by_index(&dst->windows, dstidx); 248 if (dstwl != NULL) { 249 if (dstwl->window == srcwl->window) { 250 xasprintf(cause, "same index: %d", dstidx); 251 return (-1); 252 } 253 if (killflag) { 254 /* 255 * Can't use session_detach as it will destroy session 256 * if this makes it empty. 257 */ 258 notify_session_window("window-unlinked", dst, 259 dstwl->window); 260 dstwl->flags &= ~WINLINK_ALERTFLAGS; 261 winlink_stack_remove(&dst->lastw, dstwl); 262 winlink_remove(&dst->windows, dstwl); 263 264 /* Force select/redraw if current. */ 265 if (dstwl == dst->curw) { 266 selectflag = 1; 267 dst->curw = NULL; 268 } 269 } 270 } 271 272 if (dstidx == -1) 273 dstidx = -1 - options_get_number(dst->options, "base-index"); 274 dstwl = session_attach(dst, srcwl->window, dstidx, cause); 275 if (dstwl == NULL) 276 return (-1); 277 278 if (selectflag) 279 session_select(dst, dstwl->idx); 280 server_redraw_session_group(dst); 281 282 return (0); 283 } 284 285 void 286 server_unlink_window(struct session *s, struct winlink *wl) 287 { 288 if (session_detach(s, wl)) 289 server_destroy_session_group(s); 290 else 291 server_redraw_session_group(s); 292 } 293 294 void 295 server_destroy_pane(struct window_pane *wp, int notify) 296 { 297 struct window *w = wp->window; 298 struct screen_write_ctx ctx; 299 struct grid_cell gc; 300 time_t t; 301 char tim[26]; 302 303 if (wp->fd != -1) { 304 bufferevent_free(wp->event); 305 wp->event = NULL; 306 close(wp->fd); 307 wp->fd = -1; 308 } 309 310 if (options_get_number(w->options, "remain-on-exit")) { 311 if (~wp->flags & PANE_STATUSREADY) 312 return; 313 314 if (wp->flags & PANE_STATUSDRAWN) 315 return; 316 wp->flags |= PANE_STATUSDRAWN; 317 318 if (notify) 319 notify_pane("pane-died", wp); 320 321 screen_write_start(&ctx, wp, &wp->base); 322 screen_write_scrollregion(&ctx, 0, screen_size_y(ctx.s) - 1); 323 screen_write_cursormove(&ctx, 0, screen_size_y(ctx.s) - 1, 0); 324 screen_write_linefeed(&ctx, 1, 8); 325 memcpy(&gc, &grid_default_cell, sizeof gc); 326 327 time(&t); 328 ctime_r(&t, tim); 329 330 if (WIFEXITED(wp->status)) { 331 screen_write_nputs(&ctx, -1, &gc, 332 "Pane is dead (status %d, %s)", 333 WEXITSTATUS(wp->status), 334 tim); 335 } else if (WIFSIGNALED(wp->status)) { 336 screen_write_nputs(&ctx, -1, &gc, 337 "Pane is dead (signal %d, %s)", 338 WTERMSIG(wp->status), 339 tim); 340 } 341 342 screen_write_stop(&ctx); 343 wp->flags |= PANE_REDRAW; 344 return; 345 } 346 347 if (notify) 348 notify_pane("pane-exited", wp); 349 350 server_unzoom_window(w); 351 layout_close_pane(wp); 352 window_remove_pane(w, wp); 353 354 if (TAILQ_EMPTY(&w->panes)) 355 server_kill_window(w); 356 else 357 server_redraw_window(w); 358 } 359 360 static void 361 server_destroy_session_group(struct session *s) 362 { 363 struct session_group *sg; 364 struct session *s1; 365 366 if ((sg = session_group_contains(s)) == NULL) 367 server_destroy_session(s); 368 else { 369 TAILQ_FOREACH_SAFE(s, &sg->sessions, gentry, s1) { 370 server_destroy_session(s); 371 session_destroy(s, 1, __func__); 372 } 373 } 374 } 375 376 static struct session * 377 server_next_session(struct session *s) 378 { 379 struct session *s_loop, *s_out; 380 381 s_out = NULL; 382 RB_FOREACH(s_loop, sessions, &sessions) { 383 if (s_loop == s) 384 continue; 385 if (s_out == NULL || 386 timercmp(&s_loop->activity_time, &s_out->activity_time, <)) 387 s_out = s_loop; 388 } 389 return (s_out); 390 } 391 392 void 393 server_destroy_session(struct session *s) 394 { 395 struct client *c; 396 struct session *s_new; 397 398 if (!options_get_number(s->options, "detach-on-destroy")) 399 s_new = server_next_session(s); 400 else 401 s_new = NULL; 402 403 TAILQ_FOREACH(c, &clients, entry) { 404 if (c->session != s) 405 continue; 406 if (s_new == NULL) { 407 c->session = NULL; 408 c->flags |= CLIENT_EXIT; 409 } else { 410 c->last_session = NULL; 411 c->session = s_new; 412 server_client_set_key_table(c, NULL); 413 tty_update_client_offset(c); 414 status_timer_start(c); 415 notify_client("client-session-changed", c); 416 session_update_activity(s_new, NULL); 417 gettimeofday(&s_new->last_attached_time, NULL); 418 server_redraw_client(c); 419 alerts_check_session(s_new); 420 } 421 } 422 recalculate_sizes(); 423 } 424 425 void 426 server_check_unattached(void) 427 { 428 struct session *s; 429 430 /* 431 * If any sessions are no longer attached and have destroy-unattached 432 * set, collect them. 433 */ 434 RB_FOREACH(s, sessions, &sessions) { 435 if (s->attached != 0) 436 continue; 437 if (options_get_number (s->options, "destroy-unattached")) 438 session_destroy(s, 1, __func__); 439 } 440 } 441 442 int 443 server_set_stdin_callback(struct client *c, void (*cb)(struct client *, int, 444 void *), void *cb_data, char **cause) 445 { 446 if (c == NULL || c->session != NULL) { 447 *cause = xstrdup("no client with stdin"); 448 return (-1); 449 } 450 if (c->flags & CLIENT_TERMINAL) { 451 *cause = xstrdup("stdin is a tty"); 452 return (-1); 453 } 454 if (c->stdin_callback != NULL) { 455 *cause = xstrdup("stdin is in use"); 456 return (-1); 457 } 458 459 c->stdin_callback_data = cb_data; 460 c->stdin_callback = cb; 461 462 c->references++; 463 464 if (c->stdin_closed) 465 c->stdin_callback(c, 1, c->stdin_callback_data); 466 467 proc_send(c->peer, MSG_STDIN, -1, NULL, 0); 468 469 return (0); 470 } 471 472 void 473 server_unzoom_window(struct window *w) 474 { 475 if (window_unzoom(w) == 0) 476 server_redraw_window(w); 477 } 478