1 /* $OpenBSD$ */ 2 3 /* 4 * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott (at) 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/ioctl.h> 21 #include <sys/socket.h> 22 #include <sys/stat.h> 23 #include <sys/un.h> 24 #include <sys/wait.h> 25 26 #include <errno.h> 27 #include <fcntl.h> 28 #include <signal.h> 29 #include <stdio.h> 30 #include <stdlib.h> 31 #include <string.h> 32 #include <termios.h> 33 #include <time.h> 34 #include <unistd.h> 35 36 #include "tmux.h" 37 38 /* 39 * Main server functions. 40 */ 41 42 struct clients clients; 43 44 struct tmuxproc *server_proc; 45 static int server_fd = -1; 46 static uint64_t server_client_flags; 47 static int server_exit; 48 static struct event server_ev_accept; 49 static struct event server_ev_tidy; 50 51 struct cmd_find_state marked_pane; 52 53 static u_int message_next; 54 struct message_list message_log; 55 56 time_t current_time; 57 58 static int server_loop(void); 59 static void server_send_exit(void); 60 static void server_accept(int, short, void *); 61 static void server_signal(int); 62 static void server_child_signal(void); 63 static void server_child_exited(pid_t, int); 64 static void server_child_stopped(pid_t, int); 65 66 /* Set marked pane. */ 67 void 68 server_set_marked(struct session *s, struct winlink *wl, struct window_pane *wp) 69 { 70 cmd_find_clear_state(&marked_pane, 0); 71 marked_pane.s = s; 72 marked_pane.wl = wl; 73 if (wl != NULL) 74 marked_pane.w = wl->window; 75 marked_pane.wp = wp; 76 } 77 78 /* Clear marked pane. */ 79 void 80 server_clear_marked(void) 81 { 82 cmd_find_clear_state(&marked_pane, 0); 83 } 84 85 /* Is this the marked pane? */ 86 int 87 server_is_marked(struct session *s, struct winlink *wl, struct window_pane *wp) 88 { 89 if (s == NULL || wl == NULL || wp == NULL) 90 return (0); 91 if (marked_pane.s != s || marked_pane.wl != wl) 92 return (0); 93 if (marked_pane.wp != wp) 94 return (0); 95 return (server_check_marked()); 96 } 97 98 /* Check if the marked pane is still valid. */ 99 int 100 server_check_marked(void) 101 { 102 return (cmd_find_valid_state(&marked_pane)); 103 } 104 105 /* Create server socket. */ 106 int 107 server_create_socket(uint64_t flags, char **cause) 108 { 109 struct sockaddr_un sa; 110 size_t size; 111 mode_t mask; 112 int fd, saved_errno; 113 114 memset(&sa, 0, sizeof sa); 115 sa.sun_family = AF_UNIX; 116 size = strlcpy(sa.sun_path, socket_path, sizeof sa.sun_path); 117 if (size >= sizeof sa.sun_path) { 118 errno = ENAMETOOLONG; 119 goto fail; 120 } 121 unlink(sa.sun_path); 122 123 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) 124 goto fail; 125 126 if (flags & CLIENT_DEFAULTSOCKET) 127 mask = umask(S_IXUSR|S_IXGRP|S_IRWXO); 128 else 129 mask = umask(S_IXUSR|S_IRWXG|S_IRWXO); 130 if (bind(fd, (struct sockaddr *)&sa, sizeof sa) == -1) { 131 saved_errno = errno; 132 close(fd); 133 errno = saved_errno; 134 goto fail; 135 } 136 umask(mask); 137 138 if (listen(fd, 128) == -1) { 139 saved_errno = errno; 140 close(fd); 141 errno = saved_errno; 142 goto fail; 143 } 144 setblocking(fd, 0); 145 146 return (fd); 147 148 fail: 149 if (cause != NULL) { 150 xasprintf(cause, "error creating %s (%s)", socket_path, 151 strerror(errno)); 152 } 153 return (-1); 154 } 155 156 /* Tidy up every hour. */ 157 static void 158 server_tidy_event(__unused int fd, __unused short events, __unused void *data) 159 { 160 struct timeval tv = { .tv_sec = 3600 }; 161 uint64_t t = get_timer(); 162 163 format_tidy_jobs(); 164 165 #ifdef HAVE_MALLOC_TRIM 166 malloc_trim(0); 167 #endif 168 169 log_debug("%s: took %ju milliseconds", __func__, (uintmax_t)get_timer() - t); 170 evtimer_add(&server_ev_tidy, &tv); 171 } 172 173 /* Fork new server. */ 174 int 175 server_start(struct tmuxproc *client, uint64_t flags, struct event_base *base, 176 int lockfd, char *lockfile) 177 { 178 int fd; 179 sigset_t set, oldset; 180 struct client *c = NULL; 181 char *cause = NULL; 182 struct timeval tv = { .tv_sec = 3600 }; 183 184 sigfillset(&set); 185 sigprocmask(SIG_BLOCK, &set, &oldset); 186 187 if (~flags & CLIENT_NOFORK) { 188 if (proc_fork_and_daemon(&fd) != 0) { 189 sigprocmask(SIG_SETMASK, &oldset, NULL); 190 return (fd); 191 } 192 } 193 proc_clear_signals(client, 0); 194 server_client_flags = flags; 195 196 if (event_reinit(base) != 0) 197 fatalx("event_reinit failed"); 198 server_proc = proc_start("server"); 199 200 proc_set_signals(server_proc, server_signal); 201 sigprocmask(SIG_SETMASK, &oldset, NULL); 202 203 if (log_get_level() > 1) 204 tty_create_log(); 205 if (pledge("stdio rpath wpath cpath fattr unix getpw recvfd proc exec " 206 "tty ps", NULL) != 0) 207 fatal("pledge failed"); 208 209 input_key_build(); 210 utf8_update_width_cache(); 211 RB_INIT(&windows); 212 RB_INIT(&all_window_panes); 213 TAILQ_INIT(&clients); 214 RB_INIT(&sessions); 215 key_bindings_init(); 216 TAILQ_INIT(&message_log); 217 gettimeofday(&start_time, NULL); 218 219 #ifdef HAVE_SYSTEMD 220 server_fd = systemd_create_socket(flags, &cause); 221 #else 222 server_fd = server_create_socket(flags, &cause); 223 #endif 224 if (server_fd != -1) 225 server_update_socket(); 226 if (~flags & CLIENT_NOFORK) 227 c = server_client_create(fd); 228 else 229 options_set_number(global_options, "exit-empty", 0); 230 231 if (lockfd >= 0) { 232 unlink(lockfile); 233 free(lockfile); 234 close(lockfd); 235 } 236 237 if (cause != NULL) { 238 if (c != NULL) { 239 c->exit_message = cause; 240 c->flags |= CLIENT_EXIT; 241 } else { 242 fprintf(stderr, "%s\n", cause); 243 exit(1); 244 } 245 } 246 247 evtimer_set(&server_ev_tidy, server_tidy_event, NULL); 248 evtimer_add(&server_ev_tidy, &tv); 249 250 server_acl_init(); 251 252 server_add_accept(0); 253 proc_loop(server_proc, server_loop); 254 255 job_kill_all(); 256 status_prompt_save_history(); 257 258 exit(0); 259 } 260 261 /* Server loop callback. */ 262 static int 263 server_loop(void) 264 { 265 struct client *c; 266 u_int items; 267 268 current_time = time(NULL); 269 270 do { 271 items = cmdq_next(NULL); 272 TAILQ_FOREACH(c, &clients, entry) { 273 if (c->flags & CLIENT_IDENTIFIED) 274 items += cmdq_next(c); 275 } 276 } while (items != 0); 277 278 server_client_loop(); 279 280 if (!options_get_number(global_options, "exit-empty") && !server_exit) 281 return (0); 282 283 if (!options_get_number(global_options, "exit-unattached")) { 284 if (!RB_EMPTY(&sessions)) 285 return (0); 286 } 287 288 TAILQ_FOREACH(c, &clients, entry) { 289 if (c->session != NULL) 290 return (0); 291 } 292 293 /* 294 * No attached clients therefore want to exit - flush any waiting 295 * clients but don't actually exit until they've gone. 296 */ 297 cmd_wait_for_flush(); 298 if (!TAILQ_EMPTY(&clients)) 299 return (0); 300 301 if (job_still_running()) 302 return (0); 303 304 return (1); 305 } 306 307 /* Exit the server by killing all clients and windows. */ 308 static void 309 server_send_exit(void) 310 { 311 struct client *c, *c1; 312 struct session *s, *s1; 313 314 cmd_wait_for_flush(); 315 316 TAILQ_FOREACH_SAFE(c, &clients, entry, c1) { 317 if (c->flags & CLIENT_SUSPENDED) 318 server_client_lost(c); 319 else { 320 c->flags |= CLIENT_EXIT; 321 c->exit_type = CLIENT_EXIT_SHUTDOWN; 322 } 323 c->session = NULL; 324 } 325 326 RB_FOREACH_SAFE(s, sessions, &sessions, s1) 327 session_destroy(s, 1, __func__); 328 } 329 330 /* Update socket execute permissions based on whether sessions are attached. */ 331 void 332 server_update_socket(void) 333 { 334 struct session *s; 335 static int last = -1; 336 int n, mode; 337 struct stat sb; 338 339 n = 0; 340 RB_FOREACH(s, sessions, &sessions) { 341 if (s->attached != 0) { 342 n++; 343 break; 344 } 345 } 346 347 if (n != last) { 348 last = n; 349 350 if (stat(socket_path, &sb) != 0) 351 return; 352 mode = sb.st_mode & ACCESSPERMS; 353 if (n != 0) { 354 if (mode & S_IRUSR) 355 mode |= S_IXUSR; 356 if (mode & S_IRGRP) 357 mode |= S_IXGRP; 358 if (mode & S_IROTH) 359 mode |= S_IXOTH; 360 } else 361 mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH); 362 chmod(socket_path, mode); 363 } 364 } 365 366 /* Callback for server socket. */ 367 static void 368 server_accept(int fd, short events, __unused void *data) 369 { 370 struct sockaddr_storage sa; 371 socklen_t slen = sizeof sa; 372 int newfd; 373 struct client *c; 374 375 server_add_accept(0); 376 if (!(events & EV_READ)) 377 return; 378 379 newfd = accept(fd, (struct sockaddr *) &sa, &slen); 380 if (newfd == -1) { 381 if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED) 382 return; 383 if (errno == ENFILE || errno == EMFILE) { 384 /* Delete and don't try again for 1 second. */ 385 server_add_accept(1); 386 return; 387 } 388 fatal("accept failed"); 389 } 390 391 if (server_exit) { 392 close(newfd); 393 return; 394 } 395 c = server_client_create(newfd); 396 if (!server_acl_join(c)) { 397 c->exit_message = xstrdup("access not allowed"); 398 c->flags |= CLIENT_EXIT; 399 } 400 } 401 402 /* 403 * Add accept event. If timeout is nonzero, add as a timeout instead of a read 404 * event - used to backoff when running out of file descriptors. 405 */ 406 void 407 server_add_accept(int timeout) 408 { 409 struct timeval tv = { timeout, 0 }; 410 411 if (server_fd == -1) 412 return; 413 414 if (event_initialized(&server_ev_accept)) 415 event_del(&server_ev_accept); 416 417 if (timeout == 0) { 418 event_set(&server_ev_accept, server_fd, EV_READ, server_accept, 419 NULL); 420 event_add(&server_ev_accept, NULL); 421 } else { 422 event_set(&server_ev_accept, server_fd, EV_TIMEOUT, 423 server_accept, NULL); 424 event_add(&server_ev_accept, &tv); 425 } 426 } 427 428 /* Signal handler. */ 429 static void 430 server_signal(int sig) 431 { 432 int fd; 433 434 log_debug("%s: %s", __func__, strsignal(sig)); 435 switch (sig) { 436 case SIGINT: 437 case SIGTERM: 438 server_exit = 1; 439 server_send_exit(); 440 break; 441 case SIGCHLD: 442 server_child_signal(); 443 break; 444 case SIGUSR1: 445 event_del(&server_ev_accept); 446 fd = server_create_socket(server_client_flags, NULL); 447 if (fd != -1) { 448 close(server_fd); 449 server_fd = fd; 450 server_update_socket(); 451 } 452 server_add_accept(0); 453 break; 454 case SIGUSR2: 455 proc_toggle_log(server_proc); 456 break; 457 } 458 } 459 460 /* Handle SIGCHLD. */ 461 static void 462 server_child_signal(void) 463 { 464 int status; 465 pid_t pid; 466 467 for (;;) { 468 switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) { 469 case -1: 470 if (errno == ECHILD) 471 return; 472 fatal("waitpid failed"); 473 case 0: 474 return; 475 } 476 if (WIFSTOPPED(status)) 477 server_child_stopped(pid, status); 478 else if (WIFEXITED(status) || WIFSIGNALED(status)) 479 server_child_exited(pid, status); 480 } 481 } 482 483 /* Handle exited children. */ 484 static void 485 server_child_exited(pid_t pid, int status) 486 { 487 struct window *w, *w1; 488 struct window_pane *wp; 489 490 RB_FOREACH_SAFE(w, windows, &windows, w1) { 491 TAILQ_FOREACH(wp, &w->panes, entry) { 492 if (wp->pid == pid) { 493 wp->status = status; 494 wp->flags |= PANE_STATUSREADY; 495 496 log_debug("%%%u exited", wp->id); 497 wp->flags |= PANE_EXITED; 498 499 if (window_pane_destroy_ready(wp)) 500 server_destroy_pane(wp, 1); 501 break; 502 } 503 } 504 } 505 job_check_died(pid, status); 506 } 507 508 /* Handle stopped children. */ 509 static void 510 server_child_stopped(pid_t pid, int status) 511 { 512 struct window *w; 513 struct window_pane *wp; 514 515 if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU) 516 return; 517 518 RB_FOREACH(w, windows, &windows) { 519 TAILQ_FOREACH(wp, &w->panes, entry) { 520 if (wp->pid == pid) { 521 if (killpg(pid, SIGCONT) != 0) 522 kill(pid, SIGCONT); 523 } 524 } 525 } 526 job_check_died(pid, status); 527 } 528 529 /* Add to message log. */ 530 void 531 server_add_message(const char *fmt, ...) 532 { 533 struct message_entry *msg, *msg1; 534 char *s; 535 va_list ap; 536 u_int limit; 537 538 va_start(ap, fmt); 539 xvasprintf(&s, fmt, ap); 540 va_end(ap); 541 542 log_debug("message: %s", s); 543 544 msg = xcalloc(1, sizeof *msg); 545 gettimeofday(&msg->msg_time, NULL); 546 msg->msg_num = message_next++; 547 msg->msg = s; 548 TAILQ_INSERT_TAIL(&message_log, msg, entry); 549 550 limit = options_get_number(global_options, "message-limit"); 551 TAILQ_FOREACH_SAFE(msg, &message_log, entry, msg1) { 552 if (msg->msg_num + limit >= message_next) 553 break; 554 free(msg->msg); 555 TAILQ_REMOVE(&message_log, msg, entry); 556 free(msg); 557 } 558 } 559
Indexes created Tue Feb 24 08:35:24 UTC 2026