Annotation of src/usr.bin/tmux/server.c, Revision 1.117
1.117 ! nicm 1: /* $OpenBSD: server.c,v 1.116 2014/09/01 21:58:41 nicm 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 <syslog.h>
35: #include <termios.h>
36: #include <time.h>
37: #include <unistd.h>
38:
39: #include "tmux.h"
40:
41: /*
42: * Main server functions.
43: */
44:
45: /* Client list. */
46: struct clients clients;
1.31 nicm 47: struct clients dead_clients;
1.1 nicm 48:
1.66 nicm 49: int server_fd;
50: int server_shutdown;
51: struct event server_ev_accept;
52: struct event server_ev_second;
1.45 nicm 53:
1.1 nicm 54: int server_create_socket(void);
1.66 nicm 55: void server_loop(void);
1.42 nicm 56: int server_should_shutdown(void);
1.66 nicm 57: void server_send_shutdown(void);
58: void server_clean_dead(void);
59: void server_accept_callback(int, short, void *);
60: void server_signal_callback(int, short, void *);
1.1 nicm 61: void server_child_signal(void);
1.66 nicm 62: void server_child_exited(pid_t, int);
63: void server_child_stopped(pid_t, int);
64: void server_second_callback(int, short, void *);
1.46 nicm 65: void server_lock_server(void);
66: void server_lock_sessions(void);
1.45 nicm 67:
1.60 nicm 68: /* Create server socket. */
69: int
70: server_create_socket(void)
1.1 nicm 71: {
1.60 nicm 72: struct sockaddr_un sa;
73: size_t size;
74: mode_t mask;
1.100 nicm 75: int fd;
1.60 nicm 76:
77: memset(&sa, 0, sizeof sa);
78: sa.sun_family = AF_UNIX;
79: size = strlcpy(sa.sun_path, socket_path, sizeof sa.sun_path);
80: if (size >= sizeof sa.sun_path) {
81: errno = ENAMETOOLONG;
82: fatal("socket failed");
83: }
84: unlink(sa.sun_path);
85:
86: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
87: fatal("socket failed");
88:
1.89 nicm 89: mask = umask(S_IXUSR|S_IXGRP|S_IRWXO);
1.60 nicm 90: if (bind(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1)
91: fatal("bind failed");
92: umask(mask);
93:
94: if (listen(fd, 16) == -1)
95: fatal("listen failed");
1.100 nicm 96: setblocking(fd, 0);
1.1 nicm 97:
1.75 nicm 98: server_update_socket();
99:
1.60 nicm 100: return (fd);
101: }
102:
1.1 nicm 103: /* Fork new server. */
104: int
1.103 nicm 105: server_start(int lockfd, char *lockfile)
1.1 nicm 106: {
1.109 nicm 107: int pair[2];
108: struct timeval tv;
109: char *cause;
1.1 nicm 110:
111: /* The first client is special and gets a socketpair; create it. */
112: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
113: fatal("socketpair failed");
1.115 nicm 114: log_debug("starting server");
1.1 nicm 115:
116: switch (fork()) {
117: case -1:
118: fatal("fork failed");
119: case 0:
120: break;
121: default:
122: close(pair[1]);
123: return (pair[0]);
124: }
125: close(pair[0]);
126:
127: /*
128: * Must daemonise before loading configuration as the PID changes so
129: * $TMUX would be wrong for sessions created in the config file.
130: */
1.16 nicm 131: if (daemon(1, 0) != 0)
1.1 nicm 132: fatal("daemon failed");
133:
1.88 nicm 134: /* event_init() was called in our parent, need to reinit. */
135: if (event_reinit(ev_base) != 0)
136: fatal("event_reinit failed");
1.92 nicm 137: clear_signals(0);
1.88 nicm 138:
1.16 nicm 139: logfile("server");
140: log_debug("server started, pid %ld", (long) getpid());
141:
1.1 nicm 142: ARRAY_INIT(&windows);
1.102 nicm 143: RB_INIT(&all_window_panes);
1.1 nicm 144: ARRAY_INIT(&clients);
1.31 nicm 145: ARRAY_INIT(&dead_clients);
1.97 nicm 146: RB_INIT(&sessions);
147: RB_INIT(&dead_sessions);
1.47 nicm 148: TAILQ_INIT(&session_groups);
1.15 nicm 149: mode_key_init_trees();
1.1 nicm 150: key_bindings_init();
151: utf8_build();
152:
153: start_time = time(NULL);
1.16 nicm 154: log_debug("socket path %s", socket_path);
1.96 nicm 155: setproctitle("server (%s)", socket_path);
1.16 nicm 156:
1.66 nicm 157: server_fd = server_create_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;
1.111 nicm 168: cfg_client = ARRAY_FIRST(&clients);
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;
214: u_int i;
1.1 nicm 215:
1.94 nicm 216: if (!options_get_number(&global_options, "exit-unattached")) {
1.97 nicm 217: if (!RB_EMPTY(&sessions))
218: return (0);
1.1 nicm 219: }
1.116 nicm 220:
221: for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
222: c = ARRAY_ITEM(&clients, i);
223: if (c != NULL && c->session != NULL)
224: return (0);
225: }
226:
227: /*
228: * No attached clients therefore want to exit - flush any waiting
229: * clients but don't actually exit until they've gone.
230: */
231: cmd_wait_for_flush();
1.1 nicm 232: for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
233: if (ARRAY_ITEM(&clients, i) != NULL)
1.66 nicm 234: return (0);
1.1 nicm 235: }
1.116 nicm 236:
1.66 nicm 237: return (1);
1.1 nicm 238: }
239:
1.66 nicm 240: /* Shutdown the server by killing all clients and windows. */
1.1 nicm 241: void
1.66 nicm 242: server_send_shutdown(void)
1.1 nicm 243: {
1.66 nicm 244: struct client *c;
1.97 nicm 245: struct session *s, *next_s;
1.66 nicm 246: u_int i;
1.116 nicm 247:
248: cmd_wait_for_flush();
1.1 nicm 249:
1.42 nicm 250: for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
251: c = ARRAY_ITEM(&clients, i);
252: if (c != NULL) {
253: if (c->flags & (CLIENT_BAD|CLIENT_SUSPENDED))
1.60 nicm 254: server_client_lost(c);
1.42 nicm 255: else
256: server_write_client(c, MSG_SHUTDOWN, NULL, 0);
1.66 nicm 257: c->session = NULL;
1.42 nicm 258: }
259: }
260:
1.97 nicm 261: s = RB_MIN(sessions, &sessions);
262: while (s != NULL) {
263: next_s = RB_NEXT(sessions, &sessions, s);
264: session_destroy(s);
265: s = next_s;
1.1 nicm 266: }
1.42 nicm 267: }
268:
1.66 nicm 269: /* Free dead, unreferenced clients and sessions. */
270: void
271: server_clean_dead(void)
272: {
1.97 nicm 273: struct session *s, *next_s;
1.66 nicm 274: struct client *c;
275: u_int i;
276:
1.97 nicm 277: s = RB_MIN(sessions, &dead_sessions);
278: while (s != NULL) {
279: next_s = RB_NEXT(sessions, &dead_sessions, s);
280: if (s->references == 0) {
281: RB_REMOVE(sessions, &dead_sessions, s);
1.105 nicm 282: free(s->name);
283: free(s);
1.97 nicm 284: }
285: s = next_s;
1.66 nicm 286: }
287:
288: for (i = 0; i < ARRAY_LENGTH(&dead_clients); i++) {
289: c = ARRAY_ITEM(&dead_clients, i);
290: if (c == NULL || c->references != 0)
291: continue;
292: ARRAY_SET(&dead_clients, i, NULL);
1.105 nicm 293: free(c);
1.66 nicm 294: }
295: }
296:
297: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 298: void
1.66 nicm 299: server_update_socket(void)
1.42 nicm 300: {
1.66 nicm 301: struct session *s;
302: static int last = -1;
1.93 nicm 303: int n, mode;
304: struct stat sb;
1.1 nicm 305:
1.66 nicm 306: n = 0;
1.97 nicm 307: RB_FOREACH(s, sessions, &sessions) {
308: if (!(s->flags & SESSION_UNATTACHED)) {
1.66 nicm 309: n++;
310: break;
311: }
312: }
313:
314: if (n != last) {
315: last = n;
1.93 nicm 316:
317: if (stat(socket_path, &sb) != 0)
318: return;
319: mode = sb.st_mode;
320: if (n != 0) {
321: if (mode & S_IRUSR)
322: mode |= S_IXUSR;
323: if (mode & S_IRGRP)
324: mode |= S_IXGRP;
325: if (mode & S_IROTH)
326: mode |= S_IXOTH;
327: } else
328: mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
329: chmod(socket_path, mode);
1.66 nicm 330: }
331: }
332:
333: /* Callback for server socket. */
334: void
335: server_accept_callback(int fd, short events, unused void *data)
336: {
337: struct sockaddr_storage sa;
338: socklen_t slen = sizeof sa;
339: int newfd;
340:
1.104 nicm 341: server_add_accept(0);
1.66 nicm 342: if (!(events & EV_READ))
343: return;
344:
345: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
346: if (newfd == -1) {
347: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
348: return;
1.104 nicm 349: if (errno == ENFILE || errno == EMFILE) {
350: /* Delete and don't try again for 1 second. */
351: server_add_accept(1);
352: return;
353: }
1.66 nicm 354: fatal("accept failed");
355: }
356: if (server_shutdown) {
357: close(newfd);
358: return;
1.42 nicm 359: }
1.66 nicm 360: server_client_create(newfd);
361: }
362:
1.104 nicm 363: /*
364: * Add accept event. If timeout is nonzero, add as a timeout instead of a read
365: * event - used to backoff when running out of file descriptors.
366: */
367: void
368: server_add_accept(int timeout)
369: {
370: struct timeval tv = { timeout, 0 };
371:
372: if (event_initialized(&server_ev_accept))
373: event_del(&server_ev_accept);
374:
375: if (timeout == 0) {
376: event_set(&server_ev_accept,
377: server_fd, EV_READ, server_accept_callback, NULL);
378: event_add(&server_ev_accept, NULL);
379: } else {
380: event_set(&server_ev_accept,
381: server_fd, EV_TIMEOUT, server_accept_callback, NULL);
382: event_add(&server_ev_accept, &tv);
383: }
384: }
385:
1.66 nicm 386: /* Signal handler. */
387: void
388: server_signal_callback(int sig, unused short events, unused void *data)
389: {
390: switch (sig) {
391: case SIGTERM:
392: server_shutdown = 1;
393: server_send_shutdown();
394: break;
395: case SIGCHLD:
396: server_child_signal();
397: break;
398: case SIGUSR1:
399: event_del(&server_ev_accept);
400: close(server_fd);
401: server_fd = server_create_socket();
1.104 nicm 402: server_add_accept(0);
1.66 nicm 403: break;
1.1 nicm 404: }
405: }
406:
407: /* Handle SIGCHLD. */
408: void
409: server_child_signal(void)
410: {
1.66 nicm 411: int status;
412: pid_t pid;
1.1 nicm 413:
414: for (;;) {
415: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
416: case -1:
417: if (errno == ECHILD)
418: return;
1.39 nicm 419: fatal("waitpid failed");
1.1 nicm 420: case 0:
421: return;
422: }
1.66 nicm 423: if (WIFSTOPPED(status))
424: server_child_stopped(pid, status);
1.79 nicm 425: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 426: server_child_exited(pid, status);
427: }
428: }
429:
430: /* Handle exited children. */
431: void
432: server_child_exited(pid_t pid, int status)
433: {
434: struct window *w;
435: struct window_pane *wp;
436: struct job *job;
437: u_int i;
438:
439: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
440: if ((w = ARRAY_ITEM(&windows, i)) == NULL)
441: continue;
442: TAILQ_FOREACH(wp, &w->panes, entry) {
443: if (wp->pid == pid) {
1.77 nicm 444: server_destroy_pane(wp);
445: break;
1.53 nicm 446: }
447: }
1.80 nicm 448: }
1.1 nicm 449:
1.101 nicm 450: LIST_FOREACH(job, &all_jobs, lentry) {
1.66 nicm 451: if (pid == job->pid) {
1.67 nicm 452: job_died(job, status); /* might free job */
453: break;
1.1 nicm 454: }
1.53 nicm 455: }
456: }
457:
1.66 nicm 458: /* Handle stopped children. */
1.31 nicm 459: void
1.66 nicm 460: server_child_stopped(pid_t pid, int status)
1.31 nicm 461: {
1.66 nicm 462: struct window *w;
463: struct window_pane *wp;
464: u_int i;
1.31 nicm 465:
1.66 nicm 466: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
467: return;
1.31 nicm 468:
1.66 nicm 469: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
470: if ((w = ARRAY_ITEM(&windows, i)) == NULL)
1.31 nicm 471: continue;
1.66 nicm 472: TAILQ_FOREACH(wp, &w->panes, entry) {
473: if (wp->pid == pid) {
474: if (killpg(pid, SIGCONT) != 0)
475: kill(pid, SIGCONT);
476: }
477: }
1.31 nicm 478: }
1.1 nicm 479: }
480:
1.66 nicm 481: /* Handle once-per-second timer events. */
1.1 nicm 482: void
1.66 nicm 483: server_second_callback(unused int fd, unused short events, unused void *arg)
1.1 nicm 484: {
1.60 nicm 485: struct window *w;
486: struct window_pane *wp;
1.66 nicm 487: struct timeval tv;
1.35 nicm 488: u_int i;
1.1 nicm 489:
1.60 nicm 490: if (options_get_number(&global_s_options, "lock-server"))
491: server_lock_server();
492: else
493: server_lock_sessions();
1.1 nicm 494:
1.60 nicm 495: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
496: w = ARRAY_ITEM(&windows, i);
497: if (w == NULL)
1.1 nicm 498: continue;
499:
1.60 nicm 500: TAILQ_FOREACH(wp, &w->panes, entry) {
501: if (wp->mode != NULL && wp->mode->timer != NULL)
502: wp->mode->timer(wp);
1.1 nicm 503: }
504: }
1.72 nicm 505:
506: server_client_status_timer();
1.66 nicm 507:
508: evtimer_del(&server_ev_second);
509: memset(&tv, 0, sizeof tv);
510: tv.tv_sec = 1;
511: evtimer_add(&server_ev_second, &tv);
1.1 nicm 512: }
513:
1.46 nicm 514: /* Lock the server if ALL sessions have hit the time limit. */
515: void
516: server_lock_server(void)
517: {
518: struct session *s;
519: int timeout;
520: time_t t;
521:
522: t = time(NULL);
1.97 nicm 523: RB_FOREACH(s, sessions, &sessions) {
1.99 nicm 524: if (s->flags & SESSION_UNATTACHED)
1.59 nicm 525: continue;
1.46 nicm 526: timeout = options_get_number(&s->options, "lock-after-time");
1.65 nicm 527: if (timeout <= 0 || t <= s->activity_time.tv_sec + timeout)
1.46 nicm 528: return; /* not timed out */
529: }
530:
531: server_lock();
532: recalculate_sizes();
533: }
534:
535: /* Lock any sessions which have timed out. */
536: void
537: server_lock_sessions(void)
538: {
1.80 nicm 539: struct session *s;
1.46 nicm 540: int timeout;
1.62 deraadt 541: time_t t;
1.46 nicm 542:
1.62 deraadt 543: t = time(NULL);
1.97 nicm 544: RB_FOREACH(s, sessions, &sessions) {
1.99 nicm 545: if (s->flags & SESSION_UNATTACHED)
1.59 nicm 546: continue;
1.46 nicm 547: timeout = options_get_number(&s->options, "lock-after-time");
1.65 nicm 548: if (timeout > 0 && t > s->activity_time.tv_sec + timeout) {
1.46 nicm 549: server_lock_session(s);
550: recalculate_sizes();
1.1 nicm 551: }
552: }
553: }
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