Annotation of src/usr.bin/tmux/server.c, Revision 1.86
1.86 ! nicm 1: /* $OpenBSD: server.c,v 1.85 2010/04/06 21:35:44 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;
75: int fd, mode;
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:
89: mask = umask(S_IXUSR|S_IRWXG|S_IRWXO);
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");
1.1 nicm 96:
97: if ((mode = fcntl(fd, F_GETFL)) == -1)
98: fatal("fcntl failed");
99: if (fcntl(fd, F_SETFL, mode|O_NONBLOCK) == -1)
100: fatal("fcntl failed");
101: if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
102: fatal("fcntl failed");
103:
1.75 nicm 104: server_update_socket();
105:
1.60 nicm 106: return (fd);
107: }
108:
1.1 nicm 109: /* Fork new server. */
110: int
111: server_start(char *path)
112: {
1.82 nicm 113: struct window_pane *wp;
1.84 nicm 114: int pair[2];
1.83 nicm 115: char rpathbuf[MAXPATHLEN], *cause;
1.82 nicm 116: struct timeval tv;
117: u_int i;
1.1 nicm 118:
119: /* The first client is special and gets a socketpair; create it. */
120: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
121: fatal("socketpair failed");
122:
123: switch (fork()) {
124: case -1:
125: fatal("fork failed");
126: case 0:
127: break;
128: default:
129: close(pair[1]);
130: return (pair[0]);
131: }
132: close(pair[0]);
133:
1.86 ! nicm 134: /* event_init() was called by the parent, need to reinit. */
! 135: if (event_reinit(ev_base) != 0)
! 136: fatal("event_reinit failed");
! 137:
! 138: clear_signals();
! 139:
1.1 nicm 140: /*
141: * Must daemonise before loading configuration as the PID changes so
142: * $TMUX would be wrong for sessions created in the config file.
143: */
1.16 nicm 144: if (daemon(1, 0) != 0)
1.1 nicm 145: fatal("daemon failed");
146:
1.16 nicm 147: logfile("server");
148: log_debug("server started, pid %ld", (long) getpid());
149:
1.1 nicm 150: ARRAY_INIT(&windows);
151: ARRAY_INIT(&clients);
1.31 nicm 152: ARRAY_INIT(&dead_clients);
1.1 nicm 153: ARRAY_INIT(&sessions);
1.31 nicm 154: ARRAY_INIT(&dead_sessions);
1.47 nicm 155: TAILQ_INIT(&session_groups);
1.15 nicm 156: mode_key_init_trees();
1.1 nicm 157: key_bindings_init();
158: utf8_build();
159:
160: start_time = time(NULL);
161: socket_path = path;
162:
1.16 nicm 163: if (realpath(socket_path, rpathbuf) == NULL)
164: strlcpy(rpathbuf, socket_path, sizeof rpathbuf);
165: log_debug("socket path %s", socket_path);
166: setproctitle("server (%s)", rpathbuf);
167:
1.66 nicm 168: server_fd = server_create_socket();
1.60 nicm 169: server_client_create(pair[1]);
1.16 nicm 170:
1.82 nicm 171: if (access(SYSTEM_CFG, R_OK) == 0)
1.83 nicm 172: load_cfg(SYSTEM_CFG, NULL, &cfg_causes);
1.82 nicm 173: else if (errno != ENOENT) {
1.83 nicm 174: cfg_add_cause(
175: &cfg_causes, "%s: %s", strerror(errno), SYSTEM_CFG);
1.64 nicm 176: }
1.82 nicm 177: if (cfg_file != NULL)
1.83 nicm 178: load_cfg(cfg_file, NULL, &cfg_causes);
1.82 nicm 179:
180: /*
181: * If there is a session already, put the current window and pane into
182: * more mode.
183: */
1.83 nicm 184: if (!ARRAY_EMPTY(&sessions) && !ARRAY_EMPTY(&cfg_causes)) {
1.82 nicm 185: wp = ARRAY_FIRST(&sessions)->curw->window->active;
1.85 nicm 186: window_pane_set_mode(wp, &window_copy_mode);
187: window_copy_init_for_output(wp);
1.83 nicm 188: for (i = 0; i < ARRAY_LENGTH(&cfg_causes); i++) {
189: cause = ARRAY_ITEM(&cfg_causes, i);
1.85 nicm 190: window_copy_add(wp, "%s", cause);
1.83 nicm 191: xfree(cause);
1.82 nicm 192: }
1.83 nicm 193: ARRAY_FREE(&cfg_causes);
1.82 nicm 194: }
195: cfg_finished = 1;
1.66 nicm 196:
197: event_set(&server_ev_accept,
198: server_fd, EV_READ|EV_PERSIST, server_accept_callback, NULL);
199: event_add(&server_ev_accept, NULL);
200:
201: memset(&tv, 0, sizeof tv);
202: tv.tv_sec = 1;
203: evtimer_set(&server_ev_second, server_second_callback, NULL);
204: evtimer_add(&server_ev_second, &tv);
205:
1.86 ! nicm 206: set_signals(server_signal_callback);
1.66 nicm 207: server_loop();
208: exit(0);
1.1 nicm 209: }
210:
211: /* Main server loop. */
1.66 nicm 212: void
213: server_loop(void)
1.1 nicm 214: {
1.66 nicm 215: while (!server_should_shutdown()) {
216: event_loop(EVLOOP_ONCE);
1.1 nicm 217:
1.60 nicm 218: server_window_loop();
219: server_client_loop();
1.1 nicm 220:
1.8 nicm 221: key_bindings_clean();
1.66 nicm 222: server_clean_dead();
1.80 nicm 223: }
1.66 nicm 224: }
1.31 nicm 225:
1.66 nicm 226: /* Check if the server should be shutting down (no more clients or windows). */
227: int
228: server_should_shutdown(void)
229: {
230: u_int i;
1.1 nicm 231:
232: for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
233: if (ARRAY_ITEM(&sessions, i) != NULL)
1.66 nicm 234: return (0);
1.1 nicm 235: }
236: for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
237: if (ARRAY_ITEM(&clients, i) != NULL)
1.66 nicm 238: return (0);
1.1 nicm 239: }
1.66 nicm 240: return (1);
1.1 nicm 241: }
242:
1.66 nicm 243: /* Shutdown the server by killing all clients and windows. */
1.1 nicm 244: void
1.66 nicm 245: server_send_shutdown(void)
1.1 nicm 246: {
1.66 nicm 247: struct client *c;
1.1 nicm 248: struct session *s;
1.66 nicm 249: u_int i;
1.1 nicm 250:
1.42 nicm 251: for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
252: c = ARRAY_ITEM(&clients, i);
253: if (c != NULL) {
254: if (c->flags & (CLIENT_BAD|CLIENT_SUSPENDED))
1.60 nicm 255: server_client_lost(c);
1.42 nicm 256: else
257: server_write_client(c, MSG_SHUTDOWN, NULL, 0);
1.66 nicm 258: c->session = NULL;
1.42 nicm 259: }
260: }
261:
1.1 nicm 262: for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
1.66 nicm 263: if ((s = ARRAY_ITEM(&sessions, i)) != NULL)
1.1 nicm 264: session_destroy(s);
265: }
1.42 nicm 266: }
267:
1.66 nicm 268: /* Free dead, unreferenced clients and sessions. */
269: void
270: server_clean_dead(void)
271: {
272: struct session *s;
273: struct client *c;
274: u_int i;
275:
276: for (i = 0; i < ARRAY_LENGTH(&dead_sessions); i++) {
277: s = ARRAY_ITEM(&dead_sessions, i);
278: if (s == NULL || s->references != 0)
279: continue;
280: ARRAY_SET(&dead_sessions, i, NULL);
281: xfree(s);
282: }
283:
284: for (i = 0; i < ARRAY_LENGTH(&dead_clients); i++) {
285: c = ARRAY_ITEM(&dead_clients, i);
286: if (c == NULL || c->references != 0)
287: continue;
288: ARRAY_SET(&dead_clients, i, NULL);
289: xfree(c);
290: }
291: }
292:
293: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 294: void
1.66 nicm 295: server_update_socket(void)
1.42 nicm 296: {
1.66 nicm 297: struct session *s;
298: u_int i;
299: static int last = -1;
300: int n;
1.1 nicm 301:
1.66 nicm 302: n = 0;
1.42 nicm 303: for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
1.66 nicm 304: s = ARRAY_ITEM(&sessions, i);
305: if (s != NULL && !(s->flags & SESSION_UNATTACHED)) {
306: n++;
307: break;
308: }
309: }
310:
311: if (n != last) {
312: last = n;
313: if (n != 0)
314: chmod(socket_path, S_IRWXU);
315: else
316: chmod(socket_path, S_IRUSR|S_IWUSR);
317: }
318: }
319:
320: /* Callback for server socket. */
1.78 nicm 321: /* ARGSUSED */
1.66 nicm 322: void
323: server_accept_callback(int fd, short events, unused void *data)
324: {
325: struct sockaddr_storage sa;
326: socklen_t slen = sizeof sa;
327: int newfd;
328:
329: if (!(events & EV_READ))
330: return;
331:
332: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
333: if (newfd == -1) {
334: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
335: return;
336: fatal("accept failed");
337: }
338: if (server_shutdown) {
339: close(newfd);
340: return;
1.42 nicm 341: }
1.66 nicm 342: server_client_create(newfd);
343: }
344:
345: /* Signal handler. */
1.78 nicm 346: /* ARGSUSED */
1.66 nicm 347: void
348: server_signal_callback(int sig, unused short events, unused void *data)
349: {
350: switch (sig) {
351: case SIGTERM:
352: server_shutdown = 1;
353: server_send_shutdown();
354: break;
355: case SIGCHLD:
356: server_child_signal();
357: break;
358: case SIGUSR1:
359: event_del(&server_ev_accept);
360: close(server_fd);
361: server_fd = server_create_socket();
362: event_set(&server_ev_accept, server_fd,
363: EV_READ|EV_PERSIST, server_accept_callback, NULL);
364: event_add(&server_ev_accept, NULL);
365: break;
1.1 nicm 366: }
367: }
368:
369: /* Handle SIGCHLD. */
370: void
371: server_child_signal(void)
372: {
1.66 nicm 373: int status;
374: pid_t pid;
1.1 nicm 375:
376: for (;;) {
377: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
378: case -1:
379: if (errno == ECHILD)
380: return;
1.39 nicm 381: fatal("waitpid failed");
1.1 nicm 382: case 0:
383: return;
384: }
1.66 nicm 385: if (WIFSTOPPED(status))
386: server_child_stopped(pid, status);
1.79 nicm 387: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 388: server_child_exited(pid, status);
389: }
390: }
391:
392: /* Handle exited children. */
393: void
394: server_child_exited(pid_t pid, int status)
395: {
396: struct window *w;
397: struct window_pane *wp;
398: struct job *job;
399: u_int i;
400:
401: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
402: if ((w = ARRAY_ITEM(&windows, i)) == NULL)
403: continue;
404: TAILQ_FOREACH(wp, &w->panes, entry) {
405: if (wp->pid == pid) {
1.77 nicm 406: server_destroy_pane(wp);
407: break;
1.53 nicm 408: }
409: }
1.80 nicm 410: }
1.1 nicm 411:
1.66 nicm 412: SLIST_FOREACH(job, &all_jobs, lentry) {
413: if (pid == job->pid) {
1.67 nicm 414: job_died(job, status); /* might free job */
415: break;
1.1 nicm 416: }
1.53 nicm 417: }
418: }
419:
1.66 nicm 420: /* Handle stopped children. */
1.31 nicm 421: void
1.66 nicm 422: server_child_stopped(pid_t pid, int status)
1.31 nicm 423: {
1.66 nicm 424: struct window *w;
425: struct window_pane *wp;
426: u_int i;
1.31 nicm 427:
1.66 nicm 428: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
429: return;
1.31 nicm 430:
1.66 nicm 431: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
432: if ((w = ARRAY_ITEM(&windows, i)) == NULL)
1.31 nicm 433: continue;
1.66 nicm 434: TAILQ_FOREACH(wp, &w->panes, entry) {
435: if (wp->pid == pid) {
436: if (killpg(pid, SIGCONT) != 0)
437: kill(pid, SIGCONT);
438: }
439: }
1.31 nicm 440: }
1.1 nicm 441: }
442:
1.66 nicm 443: /* Handle once-per-second timer events. */
1.78 nicm 444: /* ARGSUSED */
1.1 nicm 445: void
1.66 nicm 446: server_second_callback(unused int fd, unused short events, unused void *arg)
1.1 nicm 447: {
1.60 nicm 448: struct window *w;
449: struct window_pane *wp;
1.66 nicm 450: struct timeval tv;
1.35 nicm 451: u_int i;
1.1 nicm 452:
1.60 nicm 453: if (options_get_number(&global_s_options, "lock-server"))
454: server_lock_server();
455: else
456: server_lock_sessions();
1.1 nicm 457:
1.60 nicm 458: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
459: w = ARRAY_ITEM(&windows, i);
460: if (w == NULL)
1.1 nicm 461: continue;
462:
1.60 nicm 463: TAILQ_FOREACH(wp, &w->panes, entry) {
464: if (wp->mode != NULL && wp->mode->timer != NULL)
465: wp->mode->timer(wp);
1.1 nicm 466: }
467: }
1.72 nicm 468:
469: server_client_status_timer();
1.66 nicm 470:
471: evtimer_del(&server_ev_second);
472: memset(&tv, 0, sizeof tv);
473: tv.tv_sec = 1;
474: evtimer_add(&server_ev_second, &tv);
1.1 nicm 475: }
476:
1.46 nicm 477: /* Lock the server if ALL sessions have hit the time limit. */
478: void
479: server_lock_server(void)
480: {
481: struct session *s;
482: u_int i;
483: int timeout;
484: time_t t;
485:
486: t = time(NULL);
487: for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
488: if ((s = ARRAY_ITEM(&sessions, i)) == NULL)
489: continue;
490:
1.59 nicm 491: if (s->flags & SESSION_UNATTACHED) {
1.65 nicm 492: if (gettimeofday(&s->activity_time, NULL) != 0)
493: fatal("gettimeofday failed");
1.59 nicm 494: continue;
495: }
496:
1.46 nicm 497: timeout = options_get_number(&s->options, "lock-after-time");
1.65 nicm 498: if (timeout <= 0 || t <= s->activity_time.tv_sec + timeout)
1.46 nicm 499: return; /* not timed out */
500: }
501:
502: server_lock();
503: recalculate_sizes();
504: }
505:
506: /* Lock any sessions which have timed out. */
507: void
508: server_lock_sessions(void)
509: {
1.80 nicm 510: struct session *s;
1.62 deraadt 511: u_int i;
1.46 nicm 512: int timeout;
1.62 deraadt 513: time_t t;
1.46 nicm 514:
1.62 deraadt 515: t = time(NULL);
516: for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
1.46 nicm 517: if ((s = ARRAY_ITEM(&sessions, i)) == NULL)
518: continue;
1.59 nicm 519:
520: if (s->flags & SESSION_UNATTACHED) {
1.65 nicm 521: if (gettimeofday(&s->activity_time, NULL) != 0)
522: fatal("gettimeofday failed");
1.59 nicm 523: continue;
524: }
1.46 nicm 525:
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: server_lock_session(s);
529: recalculate_sizes();
1.1 nicm 530: }
531: }
532: }
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