Annotation of src/usr.bin/tmux/server.c, Revision 1.77
1.77 ! nicm 1: /* $OpenBSD: server.c,v 1.76 2009/11/11 13:24:42 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_sigterm;
53: struct event server_ev_sigusr1;
54: struct event server_ev_sigchld;
55: struct event server_ev_second;
1.45 nicm 56:
1.1 nicm 57: int server_create_socket(void);
1.66 nicm 58: void server_loop(void);
1.42 nicm 59: int server_should_shutdown(void);
1.66 nicm 60: void server_send_shutdown(void);
61: void server_clean_dead(void);
62: void server_accept_callback(int, short, void *);
63: void server_signal_callback(int, short, void *);
1.1 nicm 64: void server_child_signal(void);
1.66 nicm 65: void server_child_exited(pid_t, int);
66: void server_child_stopped(pid_t, int);
67: void server_second_callback(int, short, void *);
1.46 nicm 68: void server_lock_server(void);
69: void server_lock_sessions(void);
1.45 nicm 70:
1.60 nicm 71: /* Create server socket. */
72: int
73: server_create_socket(void)
1.1 nicm 74: {
1.60 nicm 75: struct sockaddr_un sa;
76: size_t size;
77: mode_t mask;
78: int fd, mode;
79:
80: memset(&sa, 0, sizeof sa);
81: sa.sun_family = AF_UNIX;
82: size = strlcpy(sa.sun_path, socket_path, sizeof sa.sun_path);
83: if (size >= sizeof sa.sun_path) {
84: errno = ENAMETOOLONG;
85: fatal("socket failed");
86: }
87: unlink(sa.sun_path);
88:
89: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
90: fatal("socket failed");
91:
92: mask = umask(S_IXUSR|S_IRWXG|S_IRWXO);
93: if (bind(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1)
94: fatal("bind failed");
95: umask(mask);
96:
97: if (listen(fd, 16) == -1)
98: fatal("listen failed");
1.1 nicm 99:
100: if ((mode = fcntl(fd, F_GETFL)) == -1)
101: fatal("fcntl failed");
102: if (fcntl(fd, F_SETFL, mode|O_NONBLOCK) == -1)
103: fatal("fcntl failed");
104: if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
105: fatal("fcntl failed");
106:
1.75 nicm 107: server_update_socket();
108:
1.60 nicm 109: return (fd);
110: }
111:
1.1 nicm 112: /* Fork new server. */
113: int
114: server_start(char *path)
115: {
1.16 nicm 116: struct client *c;
1.66 nicm 117: int pair[2];
118: char *cause, rpathbuf[MAXPATHLEN];
119: struct timeval tv;
1.1 nicm 120:
121: /* The first client is special and gets a socketpair; create it. */
122: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
123: fatal("socketpair failed");
124:
125: switch (fork()) {
126: case -1:
127: fatal("fork failed");
128: case 0:
129: break;
130: default:
131: close(pair[1]);
132: return (pair[0]);
133: }
134: close(pair[0]);
135:
136: /*
137: * Must daemonise before loading configuration as the PID changes so
138: * $TMUX would be wrong for sessions created in the config file.
139: */
1.16 nicm 140: if (daemon(1, 0) != 0)
1.1 nicm 141: fatal("daemon failed");
142:
1.16 nicm 143: logfile("server");
144: log_debug("server started, pid %ld", (long) getpid());
145:
1.1 nicm 146: ARRAY_INIT(&windows);
147: ARRAY_INIT(&clients);
1.31 nicm 148: ARRAY_INIT(&dead_clients);
1.1 nicm 149: ARRAY_INIT(&sessions);
1.31 nicm 150: ARRAY_INIT(&dead_sessions);
1.47 nicm 151: TAILQ_INIT(&session_groups);
1.15 nicm 152: mode_key_init_trees();
1.1 nicm 153: key_bindings_init();
154: utf8_build();
155:
156: start_time = time(NULL);
157: socket_path = path;
158:
1.16 nicm 159: if (realpath(socket_path, rpathbuf) == NULL)
160: strlcpy(rpathbuf, socket_path, sizeof rpathbuf);
161: log_debug("socket path %s", socket_path);
162: setproctitle("server (%s)", rpathbuf);
163:
1.71 nicm 164: event_init();
165:
1.66 nicm 166: server_fd = server_create_socket();
1.60 nicm 167: server_client_create(pair[1]);
1.16 nicm 168:
1.64 nicm 169: if (access(SYSTEM_CFG, R_OK) == 0) {
170: if (load_cfg(SYSTEM_CFG, NULL, &cause) != 0)
1.16 nicm 171: goto error;
1.64 nicm 172: } else if (errno != ENOENT) {
173: xasprintf(&cause, "%s: %s", strerror(errno), SYSTEM_CFG);
1.16 nicm 174: goto error;
1.64 nicm 175: }
1.24 nicm 176: if (cfg_file != NULL && load_cfg(cfg_file, NULL, &cause) != 0)
1.16 nicm 177: goto error;
1.66 nicm 178:
179: event_set(&server_ev_accept,
180: server_fd, EV_READ|EV_PERSIST, server_accept_callback, NULL);
181: event_add(&server_ev_accept, NULL);
182:
183: memset(&tv, 0, sizeof tv);
184: tv.tv_sec = 1;
185: evtimer_set(&server_ev_second, server_second_callback, NULL);
186: evtimer_add(&server_ev_second, &tv);
187:
188: server_signal_set();
189: server_loop();
190: exit(0);
1.1 nicm 191:
1.16 nicm 192: error:
193: /* Write the error and shutdown the server. */
194: c = ARRAY_FIRST(&clients);
1.1 nicm 195:
1.16 nicm 196: server_write_error(c, cause);
1.70 nicm 197: server_write_client(c, MSG_EXIT, NULL, 0);
1.16 nicm 198: xfree(cause);
1.1 nicm 199:
1.66 nicm 200: server_shutdown = 1;
1.1 nicm 201:
1.66 nicm 202: server_signal_set();
203: server_loop();
204: exit(1);
1.1 nicm 205: }
206:
207: /* Main server loop. */
1.66 nicm 208: void
209: server_loop(void)
1.1 nicm 210: {
1.66 nicm 211: while (!server_should_shutdown()) {
212: event_loop(EVLOOP_ONCE);
1.1 nicm 213:
1.60 nicm 214: server_window_loop();
215: server_client_loop();
1.1 nicm 216:
1.8 nicm 217: key_bindings_clean();
1.66 nicm 218: server_clean_dead();
219: }
220: }
1.31 nicm 221:
1.66 nicm 222: /* Check if the server should be shutting down (no more clients or windows). */
223: int
224: server_should_shutdown(void)
225: {
226: u_int i;
1.1 nicm 227:
228: for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
229: if (ARRAY_ITEM(&sessions, i) != NULL)
1.66 nicm 230: return (0);
1.1 nicm 231: }
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: }
1.66 nicm 236: return (1);
1.1 nicm 237: }
238:
1.66 nicm 239: /* Shutdown the server by killing all clients and windows. */
1.1 nicm 240: void
1.66 nicm 241: server_send_shutdown(void)
1.1 nicm 242: {
1.66 nicm 243: struct client *c;
1.1 nicm 244: struct session *s;
1.66 nicm 245: u_int i;
1.1 nicm 246:
1.42 nicm 247: for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
248: c = ARRAY_ITEM(&clients, i);
249: if (c != NULL) {
250: if (c->flags & (CLIENT_BAD|CLIENT_SUSPENDED))
1.60 nicm 251: server_client_lost(c);
1.42 nicm 252: else
253: server_write_client(c, MSG_SHUTDOWN, NULL, 0);
1.66 nicm 254: c->session = NULL;
1.42 nicm 255: }
256: }
257:
1.1 nicm 258: for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
1.66 nicm 259: if ((s = ARRAY_ITEM(&sessions, i)) != NULL)
1.1 nicm 260: session_destroy(s);
261: }
1.42 nicm 262: }
263:
1.66 nicm 264: /* Free dead, unreferenced clients and sessions. */
265: void
266: server_clean_dead(void)
267: {
268: struct session *s;
269: struct client *c;
270: u_int i;
271:
272: for (i = 0; i < ARRAY_LENGTH(&dead_sessions); i++) {
273: s = ARRAY_ITEM(&dead_sessions, i);
274: if (s == NULL || s->references != 0)
275: continue;
276: ARRAY_SET(&dead_sessions, i, NULL);
277: xfree(s);
278: }
279:
280: for (i = 0; i < ARRAY_LENGTH(&dead_clients); i++) {
281: c = ARRAY_ITEM(&dead_clients, i);
282: if (c == NULL || c->references != 0)
283: continue;
284: ARRAY_SET(&dead_clients, i, NULL);
285: xfree(c);
286: }
287: }
288:
289: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 290: void
1.66 nicm 291: server_update_socket(void)
1.42 nicm 292: {
1.66 nicm 293: struct session *s;
294: u_int i;
295: static int last = -1;
296: int n;
1.1 nicm 297:
1.66 nicm 298: n = 0;
1.42 nicm 299: for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
1.66 nicm 300: s = ARRAY_ITEM(&sessions, i);
301: if (s != NULL && !(s->flags & SESSION_UNATTACHED)) {
302: n++;
303: break;
304: }
305: }
306:
307: if (n != last) {
308: last = n;
309: if (n != 0)
310: chmod(socket_path, S_IRWXU);
311: else
312: chmod(socket_path, S_IRUSR|S_IWUSR);
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:
324: if (!(events & EV_READ))
325: return;
326:
327: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
328: if (newfd == -1) {
329: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
330: return;
331: fatal("accept failed");
332: }
333: if (server_shutdown) {
334: close(newfd);
335: return;
1.42 nicm 336: }
1.66 nicm 337: server_client_create(newfd);
338: }
339:
340: /* Set up server signal handling. */
341: void
342: server_signal_set(void)
343: {
344: struct sigaction sigact;
345:
346: memset(&sigact, 0, sizeof sigact);
347: sigemptyset(&sigact.sa_mask);
348: sigact.sa_flags = SA_RESTART;
349: sigact.sa_handler = SIG_IGN;
350: if (sigaction(SIGINT, &sigact, NULL) != 0)
351: fatal("sigaction failed");
352: if (sigaction(SIGPIPE, &sigact, NULL) != 0)
353: fatal("sigaction failed");
354: if (sigaction(SIGUSR2, &sigact, NULL) != 0)
355: fatal("sigaction failed");
356: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
357: fatal("sigaction failed");
358:
359: signal_set(&server_ev_sigchld, SIGCHLD, server_signal_callback, NULL);
360: signal_add(&server_ev_sigchld, NULL);
361: signal_set(&server_ev_sigterm, SIGTERM, server_signal_callback, NULL);
362: signal_add(&server_ev_sigterm, NULL);
363: signal_set(&server_ev_sigusr1, SIGUSR1, server_signal_callback, NULL);
364: signal_add(&server_ev_sigusr1, NULL);
365: }
366:
367: /* Destroy server signal events. */
368: void
369: server_signal_clear(void)
370: {
371: struct sigaction sigact;
372:
373: memset(&sigact, 0, sizeof sigact);
374: sigemptyset(&sigact.sa_mask);
375: sigact.sa_flags = SA_RESTART;
376: sigact.sa_handler = SIG_DFL;
377: if (sigaction(SIGINT, &sigact, NULL) != 0)
378: fatal("sigaction failed");
379: if (sigaction(SIGPIPE, &sigact, NULL) != 0)
380: fatal("sigaction failed");
381: if (sigaction(SIGUSR2, &sigact, NULL) != 0)
382: fatal("sigaction failed");
383: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
384: fatal("sigaction failed");
385:
386: signal_del(&server_ev_sigchld);
387: signal_del(&server_ev_sigterm);
388: signal_del(&server_ev_sigusr1);
389: }
390:
391: /* Signal handler. */
392: void
393: server_signal_callback(int sig, unused short events, unused void *data)
394: {
395: switch (sig) {
396: case SIGTERM:
397: server_shutdown = 1;
398: server_send_shutdown();
399: break;
400: case SIGCHLD:
401: server_child_signal();
402: break;
403: case SIGUSR1:
404: event_del(&server_ev_accept);
405: close(server_fd);
406: server_fd = server_create_socket();
407: event_set(&server_ev_accept, server_fd,
408: EV_READ|EV_PERSIST, server_accept_callback, NULL);
409: event_add(&server_ev_accept, NULL);
410: break;
1.1 nicm 411: }
412: }
413:
414: /* Handle SIGCHLD. */
415: void
416: server_child_signal(void)
417: {
1.66 nicm 418: int status;
419: pid_t pid;
1.1 nicm 420:
421: for (;;) {
422: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
423: case -1:
424: if (errno == ECHILD)
425: return;
1.39 nicm 426: fatal("waitpid failed");
1.1 nicm 427: case 0:
428: return;
429: }
1.66 nicm 430: if (WIFSTOPPED(status))
431: server_child_stopped(pid, status);
432: else if (WIFEXITED(status))
433: server_child_exited(pid, status);
434: }
435: }
436:
437: /* Handle exited children. */
438: void
439: server_child_exited(pid_t pid, int status)
440: {
441: struct window *w;
442: struct window_pane *wp;
443: struct job *job;
444: u_int i;
445:
446: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
447: if ((w = ARRAY_ITEM(&windows, i)) == NULL)
448: continue;
449: TAILQ_FOREACH(wp, &w->panes, entry) {
450: if (wp->pid == pid) {
1.77 ! nicm 451: server_destroy_pane(wp);
! 452: break;
1.53 nicm 453: }
454: }
1.66 nicm 455: }
1.1 nicm 456:
1.66 nicm 457: SLIST_FOREACH(job, &all_jobs, lentry) {
458: if (pid == job->pid) {
1.67 nicm 459: job_died(job, status); /* might free job */
460: break;
1.1 nicm 461: }
1.53 nicm 462: }
463: }
464:
1.66 nicm 465: /* Handle stopped children. */
1.31 nicm 466: void
1.66 nicm 467: server_child_stopped(pid_t pid, int status)
1.31 nicm 468: {
1.66 nicm 469: struct window *w;
470: struct window_pane *wp;
471: u_int i;
1.31 nicm 472:
1.66 nicm 473: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
474: return;
1.31 nicm 475:
1.66 nicm 476: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
477: if ((w = ARRAY_ITEM(&windows, i)) == NULL)
1.31 nicm 478: continue;
1.66 nicm 479: TAILQ_FOREACH(wp, &w->panes, entry) {
480: if (wp->pid == pid) {
481: if (killpg(pid, SIGCONT) != 0)
482: kill(pid, SIGCONT);
483: }
484: }
1.31 nicm 485: }
1.1 nicm 486: }
487:
1.66 nicm 488: /* Handle once-per-second timer events. */
1.1 nicm 489: void
1.66 nicm 490: server_second_callback(unused int fd, unused short events, unused void *arg)
1.1 nicm 491: {
1.60 nicm 492: struct window *w;
493: struct window_pane *wp;
1.66 nicm 494: struct timeval tv;
1.35 nicm 495: u_int i;
1.1 nicm 496:
1.60 nicm 497: if (options_get_number(&global_s_options, "lock-server"))
498: server_lock_server();
499: else
500: server_lock_sessions();
1.1 nicm 501:
1.60 nicm 502: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
503: w = ARRAY_ITEM(&windows, i);
504: if (w == NULL)
1.1 nicm 505: continue;
506:
1.60 nicm 507: TAILQ_FOREACH(wp, &w->panes, entry) {
508: if (wp->mode != NULL && wp->mode->timer != NULL)
509: wp->mode->timer(wp);
1.1 nicm 510: }
511: }
1.72 nicm 512:
513: server_client_status_timer();
1.66 nicm 514:
515: evtimer_del(&server_ev_second);
516: memset(&tv, 0, sizeof tv);
517: tv.tv_sec = 1;
518: evtimer_add(&server_ev_second, &tv);
1.1 nicm 519: }
520:
1.46 nicm 521: /* Lock the server if ALL sessions have hit the time limit. */
522: void
523: server_lock_server(void)
524: {
525: struct session *s;
526: u_int i;
527: int timeout;
528: time_t t;
529:
530: t = time(NULL);
531: for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
532: if ((s = ARRAY_ITEM(&sessions, i)) == NULL)
533: continue;
534:
1.59 nicm 535: if (s->flags & SESSION_UNATTACHED) {
1.65 nicm 536: if (gettimeofday(&s->activity_time, NULL) != 0)
537: fatal("gettimeofday failed");
1.59 nicm 538: continue;
539: }
540:
1.46 nicm 541: timeout = options_get_number(&s->options, "lock-after-time");
1.65 nicm 542: if (timeout <= 0 || t <= s->activity_time.tv_sec + timeout)
1.46 nicm 543: return; /* not timed out */
544: }
545:
546: server_lock();
547: recalculate_sizes();
548: }
549:
550: /* Lock any sessions which have timed out. */
551: void
552: server_lock_sessions(void)
553: {
554: struct session *s;
1.62 deraadt 555: u_int i;
1.46 nicm 556: int timeout;
1.62 deraadt 557: time_t t;
1.46 nicm 558:
1.62 deraadt 559: t = time(NULL);
560: for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
1.46 nicm 561: if ((s = ARRAY_ITEM(&sessions, i)) == NULL)
562: continue;
1.59 nicm 563:
564: if (s->flags & SESSION_UNATTACHED) {
1.65 nicm 565: if (gettimeofday(&s->activity_time, NULL) != 0)
566: fatal("gettimeofday failed");
1.59 nicm 567: continue;
568: }
1.46 nicm 569:
570: timeout = options_get_number(&s->options, "lock-after-time");
1.65 nicm 571: if (timeout > 0 && t > s->activity_time.tv_sec + timeout) {
1.46 nicm 572: server_lock_session(s);
573: recalculate_sizes();
1.1 nicm 574: }
575: }
576: }
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