Annotation of src/usr.bin/tmux/server.c, Revision 1.89
1.89 ! nicm 1: /* $OpenBSD: server.c,v 1.88 2010/05/04 17:28:16 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:
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");
1.1 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:
134: /*
135: * Must daemonise before loading configuration as the PID changes so
136: * $TMUX would be wrong for sessions created in the config file.
137: */
1.16 nicm 138: if (daemon(1, 0) != 0)
1.1 nicm 139: fatal("daemon failed");
140:
1.88 nicm 141: /* event_init() was called in our parent, need to reinit. */
142: if (event_reinit(ev_base) != 0)
143: fatal("event_reinit failed");
144: clear_signals();
145:
1.16 nicm 146: logfile("server");
147: log_debug("server started, pid %ld", (long) getpid());
148:
1.1 nicm 149: ARRAY_INIT(&windows);
150: ARRAY_INIT(&clients);
1.31 nicm 151: ARRAY_INIT(&dead_clients);
1.1 nicm 152: ARRAY_INIT(&sessions);
1.31 nicm 153: ARRAY_INIT(&dead_sessions);
1.47 nicm 154: TAILQ_INIT(&session_groups);
1.15 nicm 155: mode_key_init_trees();
1.1 nicm 156: key_bindings_init();
157: utf8_build();
158:
159: start_time = time(NULL);
160: socket_path = path;
161:
1.16 nicm 162: if (realpath(socket_path, rpathbuf) == NULL)
163: strlcpy(rpathbuf, socket_path, sizeof rpathbuf);
164: log_debug("socket path %s", socket_path);
165: setproctitle("server (%s)", rpathbuf);
166:
1.66 nicm 167: server_fd = server_create_socket();
1.60 nicm 168: server_client_create(pair[1]);
1.16 nicm 169:
1.82 nicm 170: if (access(SYSTEM_CFG, R_OK) == 0)
1.83 nicm 171: load_cfg(SYSTEM_CFG, NULL, &cfg_causes);
1.82 nicm 172: else if (errno != ENOENT) {
1.83 nicm 173: cfg_add_cause(
174: &cfg_causes, "%s: %s", strerror(errno), SYSTEM_CFG);
1.64 nicm 175: }
1.82 nicm 176: if (cfg_file != NULL)
1.83 nicm 177: load_cfg(cfg_file, NULL, &cfg_causes);
1.82 nicm 178:
179: /*
180: * If there is a session already, put the current window and pane into
181: * more mode.
182: */
1.83 nicm 183: if (!ARRAY_EMPTY(&sessions) && !ARRAY_EMPTY(&cfg_causes)) {
1.82 nicm 184: wp = ARRAY_FIRST(&sessions)->curw->window->active;
1.85 nicm 185: window_pane_set_mode(wp, &window_copy_mode);
186: window_copy_init_for_output(wp);
1.83 nicm 187: for (i = 0; i < ARRAY_LENGTH(&cfg_causes); i++) {
188: cause = ARRAY_ITEM(&cfg_causes, i);
1.85 nicm 189: window_copy_add(wp, "%s", cause);
1.83 nicm 190: xfree(cause);
1.82 nicm 191: }
1.83 nicm 192: ARRAY_FREE(&cfg_causes);
1.82 nicm 193: }
194: cfg_finished = 1;
1.66 nicm 195:
196: event_set(&server_ev_accept,
197: server_fd, EV_READ|EV_PERSIST, server_accept_callback, NULL);
198: event_add(&server_ev_accept, NULL);
199:
200: memset(&tv, 0, sizeof tv);
201: tv.tv_sec = 1;
202: evtimer_set(&server_ev_second, server_second_callback, NULL);
203: evtimer_add(&server_ev_second, &tv);
204:
1.88 nicm 205: set_signals(server_signal_callback);
1.66 nicm 206: server_loop();
207: exit(0);
1.1 nicm 208: }
209:
210: /* Main server loop. */
1.66 nicm 211: void
212: server_loop(void)
1.1 nicm 213: {
1.66 nicm 214: while (!server_should_shutdown()) {
215: event_loop(EVLOOP_ONCE);
1.1 nicm 216:
1.60 nicm 217: server_window_loop();
218: server_client_loop();
1.1 nicm 219:
1.8 nicm 220: key_bindings_clean();
1.66 nicm 221: server_clean_dead();
1.80 nicm 222: }
1.66 nicm 223: }
1.31 nicm 224:
1.66 nicm 225: /* Check if the server should be shutting down (no more clients or windows). */
226: int
227: server_should_shutdown(void)
228: {
229: u_int i;
1.1 nicm 230:
231: for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
232: if (ARRAY_ITEM(&sessions, i) != NULL)
1.66 nicm 233: return (0);
1.1 nicm 234: }
235: for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
236: if (ARRAY_ITEM(&clients, i) != NULL)
1.66 nicm 237: return (0);
1.1 nicm 238: }
1.66 nicm 239: return (1);
1.1 nicm 240: }
241:
1.66 nicm 242: /* Shutdown the server by killing all clients and windows. */
1.1 nicm 243: void
1.66 nicm 244: server_send_shutdown(void)
1.1 nicm 245: {
1.66 nicm 246: struct client *c;
1.1 nicm 247: struct session *s;
1.66 nicm 248: u_int i;
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:
1.1 nicm 261: for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
1.66 nicm 262: if ((s = ARRAY_ITEM(&sessions, i)) != NULL)
1.1 nicm 263: session_destroy(s);
264: }
1.42 nicm 265: }
266:
1.66 nicm 267: /* Free dead, unreferenced clients and sessions. */
268: void
269: server_clean_dead(void)
270: {
271: struct session *s;
272: struct client *c;
273: u_int i;
274:
275: for (i = 0; i < ARRAY_LENGTH(&dead_sessions); i++) {
276: s = ARRAY_ITEM(&dead_sessions, i);
277: if (s == NULL || s->references != 0)
278: continue;
279: ARRAY_SET(&dead_sessions, i, NULL);
280: xfree(s);
281: }
282:
283: for (i = 0; i < ARRAY_LENGTH(&dead_clients); i++) {
284: c = ARRAY_ITEM(&dead_clients, i);
285: if (c == NULL || c->references != 0)
286: continue;
287: ARRAY_SET(&dead_clients, i, NULL);
288: xfree(c);
289: }
290: }
291:
292: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 293: void
1.66 nicm 294: server_update_socket(void)
1.42 nicm 295: {
1.66 nicm 296: struct session *s;
297: u_int i;
298: static int last = -1;
299: int n;
1.1 nicm 300:
1.66 nicm 301: n = 0;
1.42 nicm 302: for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
1.66 nicm 303: s = ARRAY_ITEM(&sessions, i);
304: if (s != NULL && !(s->flags & SESSION_UNATTACHED)) {
305: n++;
306: break;
307: }
308: }
309:
310: if (n != last) {
311: last = n;
312: if (n != 0)
1.89 ! nicm 313: chmod(socket_path, S_IRWXU|S_IRWXG);
1.66 nicm 314: else
1.89 ! nicm 315: chmod(socket_path, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP);
1.66 nicm 316: }
317: }
318:
319: /* Callback for server socket. */
1.78 nicm 320: /* ARGSUSED */
1.66 nicm 321: void
322: server_accept_callback(int fd, short events, unused void *data)
323: {
324: struct sockaddr_storage sa;
325: socklen_t slen = sizeof sa;
326: int newfd;
327:
328: if (!(events & EV_READ))
329: return;
330:
331: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
332: if (newfd == -1) {
333: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
334: return;
335: fatal("accept failed");
336: }
337: if (server_shutdown) {
338: close(newfd);
339: return;
1.42 nicm 340: }
1.66 nicm 341: server_client_create(newfd);
342: }
343:
344: /* Signal handler. */
1.78 nicm 345: /* ARGSUSED */
1.66 nicm 346: void
347: server_signal_callback(int sig, unused short events, unused void *data)
348: {
349: switch (sig) {
350: case SIGTERM:
351: server_shutdown = 1;
352: server_send_shutdown();
353: break;
354: case SIGCHLD:
355: server_child_signal();
356: break;
357: case SIGUSR1:
358: event_del(&server_ev_accept);
359: close(server_fd);
360: server_fd = server_create_socket();
361: event_set(&server_ev_accept, server_fd,
362: EV_READ|EV_PERSIST, server_accept_callback, NULL);
363: event_add(&server_ev_accept, NULL);
364: break;
1.1 nicm 365: }
366: }
367:
368: /* Handle SIGCHLD. */
369: void
370: server_child_signal(void)
371: {
1.66 nicm 372: int status;
373: pid_t pid;
1.1 nicm 374:
375: for (;;) {
376: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
377: case -1:
378: if (errno == ECHILD)
379: return;
1.39 nicm 380: fatal("waitpid failed");
1.1 nicm 381: case 0:
382: return;
383: }
1.66 nicm 384: if (WIFSTOPPED(status))
385: server_child_stopped(pid, status);
1.79 nicm 386: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 387: server_child_exited(pid, status);
388: }
389: }
390:
391: /* Handle exited children. */
392: void
393: server_child_exited(pid_t pid, int status)
394: {
395: struct window *w;
396: struct window_pane *wp;
397: struct job *job;
398: u_int i;
399:
400: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
401: if ((w = ARRAY_ITEM(&windows, i)) == NULL)
402: continue;
403: TAILQ_FOREACH(wp, &w->panes, entry) {
404: if (wp->pid == pid) {
1.77 nicm 405: server_destroy_pane(wp);
406: break;
1.53 nicm 407: }
408: }
1.80 nicm 409: }
1.1 nicm 410:
1.66 nicm 411: SLIST_FOREACH(job, &all_jobs, lentry) {
412: if (pid == job->pid) {
1.67 nicm 413: job_died(job, status); /* might free job */
414: break;
1.1 nicm 415: }
1.53 nicm 416: }
417: }
418:
1.66 nicm 419: /* Handle stopped children. */
1.31 nicm 420: void
1.66 nicm 421: server_child_stopped(pid_t pid, int status)
1.31 nicm 422: {
1.66 nicm 423: struct window *w;
424: struct window_pane *wp;
425: u_int i;
1.31 nicm 426:
1.66 nicm 427: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
428: return;
1.31 nicm 429:
1.66 nicm 430: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
431: if ((w = ARRAY_ITEM(&windows, i)) == NULL)
1.31 nicm 432: continue;
1.66 nicm 433: TAILQ_FOREACH(wp, &w->panes, entry) {
434: if (wp->pid == pid) {
435: if (killpg(pid, SIGCONT) != 0)
436: kill(pid, SIGCONT);
437: }
438: }
1.31 nicm 439: }
1.1 nicm 440: }
441:
1.66 nicm 442: /* Handle once-per-second timer events. */
1.78 nicm 443: /* ARGSUSED */
1.1 nicm 444: void
1.66 nicm 445: server_second_callback(unused int fd, unused short events, unused void *arg)
1.1 nicm 446: {
1.60 nicm 447: struct window *w;
448: struct window_pane *wp;
1.66 nicm 449: struct timeval tv;
1.35 nicm 450: u_int i;
1.1 nicm 451:
1.60 nicm 452: if (options_get_number(&global_s_options, "lock-server"))
453: server_lock_server();
454: else
455: server_lock_sessions();
1.1 nicm 456:
1.60 nicm 457: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
458: w = ARRAY_ITEM(&windows, i);
459: if (w == NULL)
1.1 nicm 460: continue;
461:
1.60 nicm 462: TAILQ_FOREACH(wp, &w->panes, entry) {
463: if (wp->mode != NULL && wp->mode->timer != NULL)
464: wp->mode->timer(wp);
1.1 nicm 465: }
466: }
1.72 nicm 467:
468: server_client_status_timer();
1.66 nicm 469:
470: evtimer_del(&server_ev_second);
471: memset(&tv, 0, sizeof tv);
472: tv.tv_sec = 1;
473: evtimer_add(&server_ev_second, &tv);
1.1 nicm 474: }
475:
1.46 nicm 476: /* Lock the server if ALL sessions have hit the time limit. */
477: void
478: server_lock_server(void)
479: {
480: struct session *s;
481: u_int i;
482: int timeout;
483: time_t t;
484:
485: t = time(NULL);
486: for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
487: if ((s = ARRAY_ITEM(&sessions, i)) == NULL)
488: continue;
489:
1.59 nicm 490: if (s->flags & SESSION_UNATTACHED) {
1.65 nicm 491: if (gettimeofday(&s->activity_time, NULL) != 0)
492: fatal("gettimeofday failed");
1.59 nicm 493: continue;
494: }
495:
1.46 nicm 496: timeout = options_get_number(&s->options, "lock-after-time");
1.65 nicm 497: if (timeout <= 0 || t <= s->activity_time.tv_sec + timeout)
1.46 nicm 498: return; /* not timed out */
499: }
500:
501: server_lock();
502: recalculate_sizes();
503: }
504:
505: /* Lock any sessions which have timed out. */
506: void
507: server_lock_sessions(void)
508: {
1.80 nicm 509: struct session *s;
1.62 deraadt 510: u_int i;
1.46 nicm 511: int timeout;
1.62 deraadt 512: time_t t;
1.46 nicm 513:
1.62 deraadt 514: t = time(NULL);
515: for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
1.46 nicm 516: if ((s = ARRAY_ITEM(&sessions, i)) == NULL)
517: continue;
1.59 nicm 518:
519: if (s->flags & SESSION_UNATTACHED) {
1.65 nicm 520: if (gettimeofday(&s->activity_time, NULL) != 0)
521: fatal("gettimeofday failed");
1.59 nicm 522: continue;
523: }
1.46 nicm 524:
525: timeout = options_get_number(&s->options, "lock-after-time");
1.65 nicm 526: if (timeout > 0 && t > s->activity_time.tv_sec + timeout) {
1.46 nicm 527: server_lock_session(s);
528: recalculate_sizes();
1.1 nicm 529: }
530: }
531: }
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