Annotation of src/usr.bin/tmux/server.c, Revision 1.103
1.103 ! nicm 1: /* $OpenBSD: server.c,v 1.102 2011/03/27 20:27:26 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:
1.98 nicm 54: struct paste_stack global_buffers;
55:
1.1 nicm 56: int server_create_socket(void);
1.66 nicm 57: void server_loop(void);
1.42 nicm 58: int server_should_shutdown(void);
1.66 nicm 59: void server_send_shutdown(void);
60: void server_clean_dead(void);
61: void server_accept_callback(int, short, void *);
62: void server_signal_callback(int, short, void *);
1.1 nicm 63: void server_child_signal(void);
1.66 nicm 64: void server_child_exited(pid_t, int);
65: void server_child_stopped(pid_t, int);
66: void server_second_callback(int, short, void *);
1.46 nicm 67: void server_lock_server(void);
68: void server_lock_sessions(void);
1.45 nicm 69:
1.60 nicm 70: /* Create server socket. */
71: int
72: server_create_socket(void)
1.1 nicm 73: {
1.60 nicm 74: struct sockaddr_un sa;
75: size_t size;
76: mode_t mask;
1.100 nicm 77: int fd;
1.60 nicm 78:
79: memset(&sa, 0, sizeof sa);
80: sa.sun_family = AF_UNIX;
81: size = strlcpy(sa.sun_path, socket_path, sizeof sa.sun_path);
82: if (size >= sizeof sa.sun_path) {
83: errno = ENAMETOOLONG;
84: fatal("socket failed");
85: }
86: unlink(sa.sun_path);
87:
88: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
89: fatal("socket failed");
90:
1.89 nicm 91: mask = umask(S_IXUSR|S_IXGRP|S_IRWXO);
1.60 nicm 92: if (bind(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1)
93: fatal("bind failed");
94: umask(mask);
95:
96: if (listen(fd, 16) == -1)
97: fatal("listen failed");
1.100 nicm 98: setblocking(fd, 0);
1.1 nicm 99:
1.75 nicm 100: server_update_socket();
101:
1.60 nicm 102: return (fd);
103: }
104:
1.1 nicm 105: /* Fork new server. */
106: int
1.103 ! nicm 107: server_start(int lockfd, char *lockfile)
1.1 nicm 108: {
1.82 nicm 109: struct window_pane *wp;
1.84 nicm 110: int pair[2];
1.96 nicm 111: char *cause;
1.82 nicm 112: struct timeval tv;
113: u_int i;
1.1 nicm 114:
115: /* The first client is special and gets a socketpair; create it. */
116: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
117: fatal("socketpair failed");
118:
119: switch (fork()) {
120: case -1:
121: fatal("fork failed");
122: case 0:
123: break;
124: default:
125: close(pair[1]);
126: return (pair[0]);
127: }
128: close(pair[0]);
129:
130: /*
131: * Must daemonise before loading configuration as the PID changes so
132: * $TMUX would be wrong for sessions created in the config file.
133: */
1.16 nicm 134: if (daemon(1, 0) != 0)
1.1 nicm 135: fatal("daemon failed");
136:
1.88 nicm 137: /* event_init() was called in our parent, need to reinit. */
138: if (event_reinit(ev_base) != 0)
139: fatal("event_reinit failed");
1.92 nicm 140: clear_signals(0);
1.88 nicm 141:
1.16 nicm 142: logfile("server");
143: log_debug("server started, pid %ld", (long) getpid());
144:
1.1 nicm 145: ARRAY_INIT(&windows);
1.102 nicm 146: RB_INIT(&all_window_panes);
1.1 nicm 147: ARRAY_INIT(&clients);
1.31 nicm 148: ARRAY_INIT(&dead_clients);
1.97 nicm 149: RB_INIT(&sessions);
150: RB_INIT(&dead_sessions);
1.47 nicm 151: TAILQ_INIT(&session_groups);
1.98 nicm 152: ARRAY_INIT(&global_buffers);
1.15 nicm 153: mode_key_init_trees();
1.1 nicm 154: key_bindings_init();
155: utf8_build();
156:
157: start_time = time(NULL);
1.16 nicm 158: log_debug("socket path %s", socket_path);
1.96 nicm 159: setproctitle("server (%s)", socket_path);
1.16 nicm 160:
1.66 nicm 161: server_fd = server_create_socket();
1.60 nicm 162: server_client_create(pair[1]);
1.103 ! nicm 163:
! 164: unlink(lockfile);
! 165: xfree(lockfile);
! 166: close(lockfd);
1.16 nicm 167:
1.82 nicm 168: if (access(SYSTEM_CFG, R_OK) == 0)
1.83 nicm 169: load_cfg(SYSTEM_CFG, NULL, &cfg_causes);
1.82 nicm 170: else if (errno != ENOENT) {
1.83 nicm 171: cfg_add_cause(
172: &cfg_causes, "%s: %s", strerror(errno), SYSTEM_CFG);
1.64 nicm 173: }
1.82 nicm 174: if (cfg_file != NULL)
1.83 nicm 175: load_cfg(cfg_file, NULL, &cfg_causes);
1.82 nicm 176:
177: /*
178: * If there is a session already, put the current window and pane into
179: * more mode.
180: */
1.97 nicm 181: if (!RB_EMPTY(&sessions) && !ARRAY_EMPTY(&cfg_causes)) {
182: wp = RB_MIN(sessions, &sessions)->curw->window->active;
1.85 nicm 183: window_pane_set_mode(wp, &window_copy_mode);
184: window_copy_init_for_output(wp);
1.83 nicm 185: for (i = 0; i < ARRAY_LENGTH(&cfg_causes); i++) {
186: cause = ARRAY_ITEM(&cfg_causes, i);
1.85 nicm 187: window_copy_add(wp, "%s", cause);
1.83 nicm 188: xfree(cause);
1.82 nicm 189: }
1.83 nicm 190: ARRAY_FREE(&cfg_causes);
1.82 nicm 191: }
192: cfg_finished = 1;
1.66 nicm 193:
194: event_set(&server_ev_accept,
195: server_fd, EV_READ|EV_PERSIST, server_accept_callback, NULL);
196: event_add(&server_ev_accept, NULL);
197:
198: memset(&tv, 0, sizeof tv);
199: tv.tv_sec = 1;
200: evtimer_set(&server_ev_second, server_second_callback, NULL);
201: evtimer_add(&server_ev_second, &tv);
202:
1.88 nicm 203: set_signals(server_signal_callback);
1.66 nicm 204: server_loop();
205: exit(0);
1.1 nicm 206: }
207:
208: /* Main server loop. */
1.66 nicm 209: void
210: server_loop(void)
1.1 nicm 211: {
1.66 nicm 212: while (!server_should_shutdown()) {
213: event_loop(EVLOOP_ONCE);
1.1 nicm 214:
1.60 nicm 215: server_window_loop();
216: server_client_loop();
1.1 nicm 217:
1.8 nicm 218: key_bindings_clean();
1.66 nicm 219: server_clean_dead();
1.80 nicm 220: }
1.66 nicm 221: }
1.31 nicm 222:
1.94 nicm 223: /* Check if the server should be shutting down (no more clients or sessions). */
1.66 nicm 224: int
225: server_should_shutdown(void)
226: {
227: u_int i;
1.1 nicm 228:
1.94 nicm 229: if (!options_get_number(&global_options, "exit-unattached")) {
1.97 nicm 230: if (!RB_EMPTY(&sessions))
231: return (0);
1.1 nicm 232: }
233: for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
234: if (ARRAY_ITEM(&clients, i) != NULL)
1.66 nicm 235: return (0);
1.1 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;
1.1 nicm 247:
1.42 nicm 248: for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
249: c = ARRAY_ITEM(&clients, i);
250: if (c != NULL) {
251: if (c->flags & (CLIENT_BAD|CLIENT_SUSPENDED))
1.60 nicm 252: server_client_lost(c);
1.42 nicm 253: else
254: server_write_client(c, MSG_SHUTDOWN, NULL, 0);
1.66 nicm 255: c->session = NULL;
1.42 nicm 256: }
257: }
258:
1.97 nicm 259: s = RB_MIN(sessions, &sessions);
260: while (s != NULL) {
261: next_s = RB_NEXT(sessions, &sessions, s);
262: session_destroy(s);
263: s = next_s;
1.1 nicm 264: }
1.42 nicm 265: }
266:
1.66 nicm 267: /* Free dead, unreferenced clients and sessions. */
268: void
269: server_clean_dead(void)
270: {
1.97 nicm 271: struct session *s, *next_s;
1.66 nicm 272: struct client *c;
273: u_int i;
274:
1.97 nicm 275: s = RB_MIN(sessions, &dead_sessions);
276: while (s != NULL) {
277: next_s = RB_NEXT(sessions, &dead_sessions, s);
278: if (s->references == 0) {
279: RB_REMOVE(sessions, &dead_sessions, s);
280: xfree(s->name);
281: xfree(s);
282: }
283: s = next_s;
1.66 nicm 284: }
285:
286: for (i = 0; i < ARRAY_LENGTH(&dead_clients); i++) {
287: c = ARRAY_ITEM(&dead_clients, i);
288: if (c == NULL || c->references != 0)
289: continue;
290: ARRAY_SET(&dead_clients, i, NULL);
291: xfree(c);
292: }
293: }
294:
295: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 296: void
1.66 nicm 297: server_update_socket(void)
1.42 nicm 298: {
1.66 nicm 299: struct session *s;
300: static int last = -1;
1.93 nicm 301: int n, mode;
302: struct stat sb;
1.1 nicm 303:
1.66 nicm 304: n = 0;
1.97 nicm 305: RB_FOREACH(s, sessions, &sessions) {
306: if (!(s->flags & SESSION_UNATTACHED)) {
1.66 nicm 307: n++;
308: break;
309: }
310: }
311:
312: if (n != last) {
313: last = n;
1.93 nicm 314:
315: if (stat(socket_path, &sb) != 0)
316: return;
317: mode = sb.st_mode;
318: if (n != 0) {
319: if (mode & S_IRUSR)
320: mode |= S_IXUSR;
321: if (mode & S_IRGRP)
322: mode |= S_IXGRP;
323: if (mode & S_IROTH)
324: mode |= S_IXOTH;
325: } else
326: mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
327: chmod(socket_path, mode);
1.66 nicm 328: }
329: }
330:
331: /* Callback for server socket. */
1.78 nicm 332: /* ARGSUSED */
1.66 nicm 333: void
334: server_accept_callback(int fd, short events, unused void *data)
335: {
336: struct sockaddr_storage sa;
337: socklen_t slen = sizeof sa;
338: int newfd;
339:
340: if (!(events & EV_READ))
341: return;
342:
343: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
344: if (newfd == -1) {
345: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
346: return;
347: fatal("accept failed");
348: }
349: if (server_shutdown) {
350: close(newfd);
351: return;
1.42 nicm 352: }
1.66 nicm 353: server_client_create(newfd);
354: }
355:
356: /* Signal handler. */
1.78 nicm 357: /* ARGSUSED */
1.66 nicm 358: void
359: server_signal_callback(int sig, unused short events, unused void *data)
360: {
361: switch (sig) {
362: case SIGTERM:
363: server_shutdown = 1;
364: server_send_shutdown();
365: break;
366: case SIGCHLD:
367: server_child_signal();
368: break;
369: case SIGUSR1:
370: event_del(&server_ev_accept);
371: close(server_fd);
372: server_fd = server_create_socket();
373: event_set(&server_ev_accept, server_fd,
374: EV_READ|EV_PERSIST, server_accept_callback, NULL);
375: event_add(&server_ev_accept, NULL);
376: break;
1.1 nicm 377: }
378: }
379:
380: /* Handle SIGCHLD. */
381: void
382: server_child_signal(void)
383: {
1.66 nicm 384: int status;
385: pid_t pid;
1.1 nicm 386:
387: for (;;) {
388: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
389: case -1:
390: if (errno == ECHILD)
391: return;
1.39 nicm 392: fatal("waitpid failed");
1.1 nicm 393: case 0:
394: return;
395: }
1.66 nicm 396: if (WIFSTOPPED(status))
397: server_child_stopped(pid, status);
1.79 nicm 398: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 399: server_child_exited(pid, status);
400: }
401: }
402:
403: /* Handle exited children. */
404: void
405: server_child_exited(pid_t pid, int status)
406: {
407: struct window *w;
408: struct window_pane *wp;
409: struct job *job;
410: u_int i;
411:
412: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
413: if ((w = ARRAY_ITEM(&windows, i)) == NULL)
414: continue;
415: TAILQ_FOREACH(wp, &w->panes, entry) {
416: if (wp->pid == pid) {
1.77 nicm 417: server_destroy_pane(wp);
418: break;
1.53 nicm 419: }
420: }
1.80 nicm 421: }
1.1 nicm 422:
1.101 nicm 423: LIST_FOREACH(job, &all_jobs, lentry) {
1.66 nicm 424: if (pid == job->pid) {
1.67 nicm 425: job_died(job, status); /* might free job */
426: break;
1.1 nicm 427: }
1.53 nicm 428: }
429: }
430:
1.66 nicm 431: /* Handle stopped children. */
1.31 nicm 432: void
1.66 nicm 433: server_child_stopped(pid_t pid, int status)
1.31 nicm 434: {
1.66 nicm 435: struct window *w;
436: struct window_pane *wp;
437: u_int i;
1.31 nicm 438:
1.66 nicm 439: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
440: return;
1.31 nicm 441:
1.66 nicm 442: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
443: if ((w = ARRAY_ITEM(&windows, i)) == NULL)
1.31 nicm 444: continue;
1.66 nicm 445: TAILQ_FOREACH(wp, &w->panes, entry) {
446: if (wp->pid == pid) {
447: if (killpg(pid, SIGCONT) != 0)
448: kill(pid, SIGCONT);
449: }
450: }
1.31 nicm 451: }
1.1 nicm 452: }
453:
1.66 nicm 454: /* Handle once-per-second timer events. */
1.78 nicm 455: /* ARGSUSED */
1.1 nicm 456: void
1.66 nicm 457: server_second_callback(unused int fd, unused short events, unused void *arg)
1.1 nicm 458: {
1.60 nicm 459: struct window *w;
460: struct window_pane *wp;
1.66 nicm 461: struct timeval tv;
1.35 nicm 462: u_int i;
1.1 nicm 463:
1.60 nicm 464: if (options_get_number(&global_s_options, "lock-server"))
465: server_lock_server();
466: else
467: server_lock_sessions();
1.1 nicm 468:
1.60 nicm 469: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
470: w = ARRAY_ITEM(&windows, i);
471: if (w == NULL)
1.1 nicm 472: continue;
473:
1.60 nicm 474: TAILQ_FOREACH(wp, &w->panes, entry) {
475: if (wp->mode != NULL && wp->mode->timer != NULL)
476: wp->mode->timer(wp);
1.1 nicm 477: }
478: }
1.72 nicm 479:
480: server_client_status_timer();
1.66 nicm 481:
482: evtimer_del(&server_ev_second);
483: memset(&tv, 0, sizeof tv);
484: tv.tv_sec = 1;
485: evtimer_add(&server_ev_second, &tv);
1.1 nicm 486: }
487:
1.46 nicm 488: /* Lock the server if ALL sessions have hit the time limit. */
489: void
490: server_lock_server(void)
491: {
492: struct session *s;
493: int timeout;
494: time_t t;
495:
496: t = time(NULL);
1.97 nicm 497: RB_FOREACH(s, sessions, &sessions) {
1.99 nicm 498: if (s->flags & SESSION_UNATTACHED)
1.59 nicm 499: continue;
1.46 nicm 500: timeout = options_get_number(&s->options, "lock-after-time");
1.65 nicm 501: if (timeout <= 0 || t <= s->activity_time.tv_sec + timeout)
1.46 nicm 502: return; /* not timed out */
503: }
504:
505: server_lock();
506: recalculate_sizes();
507: }
508:
509: /* Lock any sessions which have timed out. */
510: void
511: server_lock_sessions(void)
512: {
1.80 nicm 513: struct session *s;
1.46 nicm 514: int timeout;
1.62 deraadt 515: time_t t;
1.46 nicm 516:
1.62 deraadt 517: t = time(NULL);
1.97 nicm 518: RB_FOREACH(s, sessions, &sessions) {
1.99 nicm 519: if (s->flags & SESSION_UNATTACHED)
1.59 nicm 520: continue;
1.46 nicm 521: timeout = options_get_number(&s->options, "lock-after-time");
1.65 nicm 522: if (timeout > 0 && t > s->activity_time.tv_sec + timeout) {
1.46 nicm 523: server_lock_session(s);
524: recalculate_sizes();
1.1 nicm 525: }
526: }
527: }
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