Annotation of src/usr.bin/tmux/server.c, Revision 1.125
1.125 ! nicm 1: /* $OpenBSD: server.c,v 1.124 2015/05/31 23:27:06 deraadt Exp $ */
1.1 nicm 2:
3: /*
4: * Copyright (c) 2007 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: #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>
1.66 nicm 27: #include <event.h>
1.1 nicm 28: #include <fcntl.h>
1.5 nicm 29: #include <paths.h>
1.1 nicm 30: #include <signal.h>
31: #include <stdio.h>
32: #include <stdlib.h>
33: #include <string.h>
34: #include <termios.h>
35: #include <time.h>
36: #include <unistd.h>
37:
38: #include "tmux.h"
39:
40: /*
41: * Main server functions.
42: */
43:
44: /* Client list. */
45: struct clients clients;
1.31 nicm 46: struct clients dead_clients;
1.1 nicm 47:
1.66 nicm 48: int server_fd;
49: int server_shutdown;
50: struct event server_ev_accept;
51: struct event server_ev_second;
1.45 nicm 52:
1.1 nicm 53: int server_create_socket(void);
1.66 nicm 54: void server_loop(void);
1.42 nicm 55: int server_should_shutdown(void);
1.66 nicm 56: void server_send_shutdown(void);
57: void server_clean_dead(void);
58: void server_accept_callback(int, short, void *);
59: void server_signal_callback(int, short, void *);
1.1 nicm 60: void server_child_signal(void);
1.66 nicm 61: void server_child_exited(pid_t, int);
62: void server_child_stopped(pid_t, int);
63: void server_second_callback(int, short, void *);
1.46 nicm 64: void server_lock_server(void);
65: void server_lock_sessions(void);
1.45 nicm 66:
1.60 nicm 67: /* Create server socket. */
68: int
69: server_create_socket(void)
1.1 nicm 70: {
1.60 nicm 71: struct sockaddr_un sa;
72: size_t size;
73: mode_t mask;
1.100 nicm 74: int fd;
1.60 nicm 75:
76: memset(&sa, 0, sizeof sa);
77: sa.sun_family = AF_UNIX;
78: size = strlcpy(sa.sun_path, socket_path, sizeof sa.sun_path);
79: if (size >= sizeof sa.sun_path) {
80: errno = ENAMETOOLONG;
1.119 nicm 81: return (-1);
1.60 nicm 82: }
83: unlink(sa.sun_path);
84:
85: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.119 nicm 86: return (-1);
1.60 nicm 87:
1.89 nicm 88: mask = umask(S_IXUSR|S_IXGRP|S_IRWXO);
1.60 nicm 89: if (bind(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1)
1.119 nicm 90: return (-1);
1.60 nicm 91: umask(mask);
92:
93: if (listen(fd, 16) == -1)
1.119 nicm 94: return (-1);
1.100 nicm 95: setblocking(fd, 0);
1.1 nicm 96:
1.60 nicm 97: return (fd);
98: }
99:
1.1 nicm 100: /* Fork new server. */
101: int
1.103 nicm 102: server_start(int lockfd, char *lockfile)
1.1 nicm 103: {
1.109 nicm 104: int pair[2];
105: struct timeval tv;
106: char *cause;
1.1 nicm 107:
108: /* The first client is special and gets a socketpair; create it. */
109: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
110: fatal("socketpair failed");
1.115 nicm 111: log_debug("starting server");
1.1 nicm 112:
113: switch (fork()) {
114: case -1:
115: fatal("fork failed");
116: case 0:
117: break;
118: default:
119: close(pair[1]);
120: return (pair[0]);
121: }
122: close(pair[0]);
123:
124: /*
125: * Must daemonise before loading configuration as the PID changes so
126: * $TMUX would be wrong for sessions created in the config file.
127: */
1.16 nicm 128: if (daemon(1, 0) != 0)
1.1 nicm 129: fatal("daemon failed");
130:
1.88 nicm 131: /* event_init() was called in our parent, need to reinit. */
1.125 ! nicm 132: clear_signals(0);
1.88 nicm 133: if (event_reinit(ev_base) != 0)
134: fatal("event_reinit failed");
135:
1.16 nicm 136: logfile("server");
137: log_debug("server started, pid %ld", (long) getpid());
138:
1.121 nicm 139: RB_INIT(&windows);
1.102 nicm 140: RB_INIT(&all_window_panes);
1.122 nicm 141: TAILQ_INIT(&clients);
142: TAILQ_INIT(&dead_clients);
1.97 nicm 143: RB_INIT(&sessions);
144: RB_INIT(&dead_sessions);
1.47 nicm 145: TAILQ_INIT(&session_groups);
1.15 nicm 146: mode_key_init_trees();
1.1 nicm 147: key_bindings_init();
148: utf8_build();
149:
150: start_time = time(NULL);
1.16 nicm 151: log_debug("socket path %s", socket_path);
1.96 nicm 152: setproctitle("server (%s)", socket_path);
1.16 nicm 153:
1.66 nicm 154: server_fd = server_create_socket();
1.119 nicm 155: if (server_fd == -1)
156: fatal("couldn't create socket");
157: server_update_socket();
1.60 nicm 158: server_client_create(pair[1]);
1.103 nicm 159:
160: unlink(lockfile);
1.105 nicm 161: free(lockfile);
1.103 nicm 162: close(lockfd);
1.16 nicm 163:
1.109 nicm 164: cfg_cmd_q = cmdq_new(NULL);
165: cfg_cmd_q->emptyfn = cfg_default_done;
166: cfg_finished = 0;
167: cfg_references = 1;
1.122 nicm 168: cfg_client = TAILQ_FIRST(&clients);
1.111 nicm 169: if (cfg_client != NULL)
170: cfg_client->references++;
1.109 nicm 171:
1.110 nicm 172: if (access(TMUX_CONF, R_OK) == 0) {
1.117 nicm 173: if (load_cfg(TMUX_CONF, cfg_cmd_q, &cause) == -1)
174: cfg_add_cause("%s: %s", TMUX_CONF, cause);
175: } else if (errno != ENOENT)
176: cfg_add_cause("%s: %s", TMUX_CONF, strerror(errno));
1.109 nicm 177: if (cfg_file != NULL) {
1.117 nicm 178: if (load_cfg(cfg_file, cfg_cmd_q, &cause) == -1)
179: cfg_add_cause("%s: %s", cfg_file, cause);
1.109 nicm 180: }
181: cmdq_continue(cfg_cmd_q);
1.66 nicm 182:
1.104 nicm 183: server_add_accept(0);
1.66 nicm 184:
185: memset(&tv, 0, sizeof tv);
186: tv.tv_sec = 1;
187: evtimer_set(&server_ev_second, server_second_callback, NULL);
188: evtimer_add(&server_ev_second, &tv);
189:
1.88 nicm 190: set_signals(server_signal_callback);
1.66 nicm 191: server_loop();
192: exit(0);
1.1 nicm 193: }
194:
195: /* Main server loop. */
1.66 nicm 196: void
197: server_loop(void)
1.1 nicm 198: {
1.66 nicm 199: while (!server_should_shutdown()) {
200: event_loop(EVLOOP_ONCE);
1.1 nicm 201:
1.60 nicm 202: server_window_loop();
203: server_client_loop();
1.1 nicm 204:
1.66 nicm 205: server_clean_dead();
1.80 nicm 206: }
1.66 nicm 207: }
1.31 nicm 208:
1.112 nicm 209: /* Check if the server should exit (no more clients or sessions). */
1.66 nicm 210: int
211: server_should_shutdown(void)
212: {
1.116 nicm 213: struct client *c;
1.1 nicm 214:
1.94 nicm 215: if (!options_get_number(&global_options, "exit-unattached")) {
1.97 nicm 216: if (!RB_EMPTY(&sessions))
217: return (0);
1.1 nicm 218: }
1.116 nicm 219:
1.122 nicm 220: TAILQ_FOREACH(c, &clients, entry) {
221: if (c->session != NULL)
1.116 nicm 222: return (0);
223: }
224:
225: /*
226: * No attached clients therefore want to exit - flush any waiting
227: * clients but don't actually exit until they've gone.
228: */
229: cmd_wait_for_flush();
1.122 nicm 230: if (!TAILQ_EMPTY(&clients))
231: return (0);
1.116 nicm 232:
1.66 nicm 233: return (1);
1.1 nicm 234: }
235:
1.66 nicm 236: /* Shutdown the server by killing all clients and windows. */
1.1 nicm 237: void
1.66 nicm 238: server_send_shutdown(void)
1.1 nicm 239: {
1.122 nicm 240: struct client *c, *c1;
241: struct session *s, *s1;
1.116 nicm 242:
243: cmd_wait_for_flush();
1.1 nicm 244:
1.122 nicm 245: TAILQ_FOREACH_SAFE(c, &clients, entry, c1) {
246: if (c->flags & (CLIENT_BAD|CLIENT_SUSPENDED))
247: server_client_lost(c);
248: else
249: server_write_client(c, MSG_SHUTDOWN, NULL, 0);
250: c->session = NULL;
1.42 nicm 251: }
252:
1.122 nicm 253: RB_FOREACH_SAFE(s, sessions, &sessions, s1)
1.97 nicm 254: session_destroy(s);
1.42 nicm 255: }
256:
1.66 nicm 257: /* Free dead, unreferenced clients and sessions. */
258: void
259: server_clean_dead(void)
260: {
1.122 nicm 261: struct session *s, *s1;
262: struct client *c, *c1;
1.66 nicm 263:
1.122 nicm 264: RB_FOREACH_SAFE(s, sessions, &dead_sessions, s1) {
265: if (s->references != 0)
266: continue;
267: RB_REMOVE(sessions, &dead_sessions, s);
268: free(s->name);
269: free(s);
1.66 nicm 270: }
271:
1.122 nicm 272: TAILQ_FOREACH_SAFE(c, &dead_clients, entry, c1) {
273: if (c->references != 0)
1.66 nicm 274: continue;
1.122 nicm 275: TAILQ_REMOVE(&dead_clients, c, entry);
1.105 nicm 276: free(c);
1.66 nicm 277: }
278: }
279:
280: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 281: void
1.66 nicm 282: server_update_socket(void)
1.42 nicm 283: {
1.66 nicm 284: struct session *s;
285: static int last = -1;
1.93 nicm 286: int n, mode;
287: struct stat sb;
1.1 nicm 288:
1.66 nicm 289: n = 0;
1.97 nicm 290: RB_FOREACH(s, sessions, &sessions) {
291: if (!(s->flags & SESSION_UNATTACHED)) {
1.66 nicm 292: n++;
293: break;
294: }
295: }
296:
297: if (n != last) {
298: last = n;
1.93 nicm 299:
300: if (stat(socket_path, &sb) != 0)
301: return;
302: mode = sb.st_mode;
303: if (n != 0) {
304: if (mode & S_IRUSR)
305: mode |= S_IXUSR;
306: if (mode & S_IRGRP)
307: mode |= S_IXGRP;
308: if (mode & S_IROTH)
309: mode |= S_IXOTH;
310: } else
311: mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
312: chmod(socket_path, mode);
1.66 nicm 313: }
314: }
315:
316: /* Callback for server socket. */
317: void
318: server_accept_callback(int fd, short events, unused void *data)
319: {
320: struct sockaddr_storage sa;
321: socklen_t slen = sizeof sa;
322: int newfd;
323:
1.104 nicm 324: server_add_accept(0);
1.66 nicm 325: if (!(events & EV_READ))
326: return;
327:
328: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
329: if (newfd == -1) {
330: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
331: return;
1.104 nicm 332: if (errno == ENFILE || errno == EMFILE) {
333: /* Delete and don't try again for 1 second. */
334: server_add_accept(1);
335: return;
336: }
1.66 nicm 337: fatal("accept failed");
338: }
339: if (server_shutdown) {
340: close(newfd);
341: return;
1.42 nicm 342: }
1.66 nicm 343: server_client_create(newfd);
344: }
345:
1.104 nicm 346: /*
347: * Add accept event. If timeout is nonzero, add as a timeout instead of a read
348: * event - used to backoff when running out of file descriptors.
349: */
350: void
351: server_add_accept(int timeout)
352: {
353: struct timeval tv = { timeout, 0 };
354:
355: if (event_initialized(&server_ev_accept))
356: event_del(&server_ev_accept);
357:
358: if (timeout == 0) {
359: event_set(&server_ev_accept,
360: server_fd, EV_READ, server_accept_callback, NULL);
361: event_add(&server_ev_accept, NULL);
362: } else {
363: event_set(&server_ev_accept,
364: server_fd, EV_TIMEOUT, server_accept_callback, NULL);
365: event_add(&server_ev_accept, &tv);
366: }
367: }
368:
1.66 nicm 369: /* Signal handler. */
370: void
371: server_signal_callback(int sig, unused short events, unused void *data)
372: {
1.119 nicm 373: int fd;
1.120 nicm 374:
1.66 nicm 375: switch (sig) {
376: case SIGTERM:
377: server_shutdown = 1;
378: server_send_shutdown();
379: break;
380: case SIGCHLD:
381: server_child_signal();
382: break;
383: case SIGUSR1:
384: event_del(&server_ev_accept);
1.119 nicm 385: fd = server_create_socket();
386: if (fd != -1) {
387: close(server_fd);
388: server_fd = fd;
389: server_update_socket();
390: }
1.104 nicm 391: server_add_accept(0);
1.66 nicm 392: break;
1.1 nicm 393: }
394: }
395:
396: /* Handle SIGCHLD. */
397: void
398: server_child_signal(void)
399: {
1.66 nicm 400: int status;
401: pid_t pid;
1.1 nicm 402:
403: for (;;) {
404: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
405: case -1:
406: if (errno == ECHILD)
407: return;
1.39 nicm 408: fatal("waitpid failed");
1.1 nicm 409: case 0:
410: return;
411: }
1.66 nicm 412: if (WIFSTOPPED(status))
413: server_child_stopped(pid, status);
1.79 nicm 414: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 415: server_child_exited(pid, status);
416: }
417: }
418:
419: /* Handle exited children. */
420: void
421: server_child_exited(pid_t pid, int status)
422: {
1.121 nicm 423: struct window *w, *w1;
1.66 nicm 424: struct window_pane *wp;
425: struct job *job;
426:
1.121 nicm 427: RB_FOREACH_SAFE(w, windows, &windows, w1) {
1.66 nicm 428: TAILQ_FOREACH(wp, &w->panes, entry) {
429: if (wp->pid == pid) {
1.118 nicm 430: wp->status = status;
1.77 nicm 431: server_destroy_pane(wp);
432: break;
1.53 nicm 433: }
434: }
1.80 nicm 435: }
1.1 nicm 436:
1.101 nicm 437: LIST_FOREACH(job, &all_jobs, lentry) {
1.66 nicm 438: if (pid == job->pid) {
1.67 nicm 439: job_died(job, status); /* might free job */
440: break;
1.1 nicm 441: }
1.53 nicm 442: }
443: }
444:
1.66 nicm 445: /* Handle stopped children. */
1.31 nicm 446: void
1.66 nicm 447: server_child_stopped(pid_t pid, int status)
1.31 nicm 448: {
1.66 nicm 449: struct window *w;
450: struct window_pane *wp;
1.31 nicm 451:
1.66 nicm 452: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
453: return;
1.31 nicm 454:
1.121 nicm 455: RB_FOREACH(w, windows, &windows) {
1.66 nicm 456: TAILQ_FOREACH(wp, &w->panes, entry) {
457: if (wp->pid == pid) {
458: if (killpg(pid, SIGCONT) != 0)
459: kill(pid, SIGCONT);
460: }
461: }
1.31 nicm 462: }
1.1 nicm 463: }
464:
1.66 nicm 465: /* Handle once-per-second timer events. */
1.1 nicm 466: void
1.66 nicm 467: server_second_callback(unused int fd, unused short events, unused void *arg)
1.1 nicm 468: {
1.60 nicm 469: struct window *w;
470: struct window_pane *wp;
1.66 nicm 471: struct timeval tv;
1.1 nicm 472:
1.60 nicm 473: if (options_get_number(&global_s_options, "lock-server"))
474: server_lock_server();
475: else
476: server_lock_sessions();
1.1 nicm 477:
1.121 nicm 478: RB_FOREACH(w, windows, &windows) {
1.60 nicm 479: TAILQ_FOREACH(wp, &w->panes, entry) {
480: if (wp->mode != NULL && wp->mode->timer != NULL)
481: wp->mode->timer(wp);
1.1 nicm 482: }
483: }
1.72 nicm 484:
485: server_client_status_timer();
1.123 nicm 486:
487: format_clean();
1.66 nicm 488:
489: evtimer_del(&server_ev_second);
490: memset(&tv, 0, sizeof tv);
491: tv.tv_sec = 1;
492: evtimer_add(&server_ev_second, &tv);
1.1 nicm 493: }
494:
1.46 nicm 495: /* Lock the server if ALL sessions have hit the time limit. */
496: void
497: server_lock_server(void)
498: {
499: struct session *s;
500: int timeout;
501: time_t t;
502:
503: t = time(NULL);
1.97 nicm 504: RB_FOREACH(s, sessions, &sessions) {
1.99 nicm 505: if (s->flags & SESSION_UNATTACHED)
1.59 nicm 506: continue;
1.46 nicm 507: timeout = options_get_number(&s->options, "lock-after-time");
1.65 nicm 508: if (timeout <= 0 || t <= s->activity_time.tv_sec + timeout)
1.46 nicm 509: return; /* not timed out */
510: }
511:
512: server_lock();
513: recalculate_sizes();
514: }
515:
516: /* Lock any sessions which have timed out. */
517: void
518: server_lock_sessions(void)
519: {
1.80 nicm 520: struct session *s;
1.46 nicm 521: int timeout;
1.62 deraadt 522: time_t t;
1.46 nicm 523:
1.62 deraadt 524: t = time(NULL);
1.97 nicm 525: RB_FOREACH(s, sessions, &sessions) {
1.99 nicm 526: if (s->flags & SESSION_UNATTACHED)
1.59 nicm 527: continue;
1.46 nicm 528: timeout = options_get_number(&s->options, "lock-after-time");
1.65 nicm 529: if (timeout > 0 && t > s->activity_time.tv_sec + timeout) {
1.46 nicm 530: server_lock_session(s);
531: recalculate_sizes();
1.1 nicm 532: }
533: }
534: }
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