Annotation of src/usr.bin/tmux/server.c, Revision 1.114
1.114 ! nicm 1: /* $OpenBSD: server.c,v 1.113 2014/04/24 09:14:43 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");
114:
115: switch (fork()) {
116: case -1:
117: fatal("fork failed");
118: case 0:
119: break;
120: default:
121: close(pair[1]);
122: return (pair[0]);
123: }
124: close(pair[0]);
125:
126: /*
127: * Must daemonise before loading configuration as the PID changes so
128: * $TMUX would be wrong for sessions created in the config file.
129: */
1.16 nicm 130: if (daemon(1, 0) != 0)
1.1 nicm 131: fatal("daemon failed");
132:
1.88 nicm 133: /* event_init() was called in our parent, need to reinit. */
134: if (event_reinit(ev_base) != 0)
135: fatal("event_reinit failed");
1.92 nicm 136: clear_signals(0);
1.88 nicm 137:
1.16 nicm 138: logfile("server");
139: log_debug("server started, pid %ld", (long) getpid());
140:
1.1 nicm 141: ARRAY_INIT(&windows);
1.102 nicm 142: RB_INIT(&all_window_panes);
1.1 nicm 143: ARRAY_INIT(&clients);
1.31 nicm 144: ARRAY_INIT(&dead_clients);
1.97 nicm 145: RB_INIT(&sessions);
146: RB_INIT(&dead_sessions);
1.47 nicm 147: TAILQ_INIT(&session_groups);
1.15 nicm 148: mode_key_init_trees();
1.1 nicm 149: key_bindings_init();
150: utf8_build();
151:
152: start_time = time(NULL);
1.16 nicm 153: log_debug("socket path %s", socket_path);
1.96 nicm 154: setproctitle("server (%s)", socket_path);
1.16 nicm 155:
1.66 nicm 156: server_fd = server_create_socket();
1.60 nicm 157: server_client_create(pair[1]);
1.103 nicm 158:
159: unlink(lockfile);
1.105 nicm 160: free(lockfile);
1.103 nicm 161: close(lockfd);
1.16 nicm 162:
1.109 nicm 163: cfg_cmd_q = cmdq_new(NULL);
164: cfg_cmd_q->emptyfn = cfg_default_done;
165: cfg_finished = 0;
166: cfg_references = 1;
167: ARRAY_INIT(&cfg_causes);
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) {
173: if (load_cfg(TMUX_CONF, cfg_cmd_q, &cause) == -1) {
174: xasprintf(&cause, "%s: %s", TMUX_CONF, cause);
1.109 nicm 175: ARRAY_ADD(&cfg_causes, cause);
176: }
177: } else if (errno != ENOENT) {
1.110 nicm 178: xasprintf(&cause, "%s: %s", TMUX_CONF, strerror(errno));
1.109 nicm 179: ARRAY_ADD(&cfg_causes, cause);
1.64 nicm 180: }
1.109 nicm 181: if (cfg_file != NULL) {
182: if (load_cfg(cfg_file, cfg_cmd_q, &cause) == -1) {
183: xasprintf(&cause, "%s: %s", cfg_file, cause);
184: ARRAY_ADD(&cfg_causes, cause);
185: }
186: }
187: cmdq_continue(cfg_cmd_q);
1.66 nicm 188:
1.104 nicm 189: server_add_accept(0);
1.66 nicm 190:
191: memset(&tv, 0, sizeof tv);
192: tv.tv_sec = 1;
193: evtimer_set(&server_ev_second, server_second_callback, NULL);
194: evtimer_add(&server_ev_second, &tv);
195:
1.88 nicm 196: set_signals(server_signal_callback);
1.66 nicm 197: server_loop();
198: exit(0);
1.1 nicm 199: }
200:
201: /* Main server loop. */
1.66 nicm 202: void
203: server_loop(void)
1.1 nicm 204: {
1.66 nicm 205: while (!server_should_shutdown()) {
206: event_loop(EVLOOP_ONCE);
1.1 nicm 207:
1.60 nicm 208: server_window_loop();
209: server_client_loop();
1.1 nicm 210:
1.66 nicm 211: server_clean_dead();
1.80 nicm 212: }
1.66 nicm 213: }
1.31 nicm 214:
1.112 nicm 215: /* Check if the server should exit (no more clients or sessions). */
1.66 nicm 216: int
217: server_should_shutdown(void)
218: {
219: u_int i;
1.1 nicm 220:
1.94 nicm 221: if (!options_get_number(&global_options, "exit-unattached")) {
1.97 nicm 222: if (!RB_EMPTY(&sessions))
223: return (0);
1.1 nicm 224: }
225: for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
226: if (ARRAY_ITEM(&clients, i) != NULL)
1.66 nicm 227: return (0);
1.1 nicm 228: }
1.66 nicm 229: return (1);
1.1 nicm 230: }
231:
1.66 nicm 232: /* Shutdown the server by killing all clients and windows. */
1.1 nicm 233: void
1.66 nicm 234: server_send_shutdown(void)
1.1 nicm 235: {
1.66 nicm 236: struct client *c;
1.97 nicm 237: struct session *s, *next_s;
1.66 nicm 238: u_int i;
1.1 nicm 239:
1.42 nicm 240: for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
241: c = ARRAY_ITEM(&clients, i);
242: if (c != NULL) {
243: if (c->flags & (CLIENT_BAD|CLIENT_SUSPENDED))
1.60 nicm 244: server_client_lost(c);
1.42 nicm 245: else
246: server_write_client(c, MSG_SHUTDOWN, NULL, 0);
1.66 nicm 247: c->session = NULL;
1.42 nicm 248: }
249: }
250:
1.97 nicm 251: s = RB_MIN(sessions, &sessions);
252: while (s != NULL) {
253: next_s = RB_NEXT(sessions, &sessions, s);
254: session_destroy(s);
255: s = next_s;
1.1 nicm 256: }
1.42 nicm 257: }
258:
1.66 nicm 259: /* Free dead, unreferenced clients and sessions. */
260: void
261: server_clean_dead(void)
262: {
1.97 nicm 263: struct session *s, *next_s;
1.66 nicm 264: struct client *c;
265: u_int i;
266:
1.97 nicm 267: s = RB_MIN(sessions, &dead_sessions);
268: while (s != NULL) {
269: next_s = RB_NEXT(sessions, &dead_sessions, s);
270: if (s->references == 0) {
271: RB_REMOVE(sessions, &dead_sessions, s);
1.105 nicm 272: free(s->name);
273: free(s);
1.97 nicm 274: }
275: s = next_s;
1.66 nicm 276: }
277:
278: for (i = 0; i < ARRAY_LENGTH(&dead_clients); i++) {
279: c = ARRAY_ITEM(&dead_clients, i);
280: if (c == NULL || c->references != 0)
281: continue;
282: ARRAY_SET(&dead_clients, i, NULL);
1.105 nicm 283: free(c);
1.66 nicm 284: }
285: }
286:
287: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 288: void
1.66 nicm 289: server_update_socket(void)
1.42 nicm 290: {
1.66 nicm 291: struct session *s;
292: static int last = -1;
1.93 nicm 293: int n, mode;
294: struct stat sb;
1.1 nicm 295:
1.66 nicm 296: n = 0;
1.97 nicm 297: RB_FOREACH(s, sessions, &sessions) {
298: if (!(s->flags & SESSION_UNATTACHED)) {
1.66 nicm 299: n++;
300: break;
301: }
302: }
303:
304: if (n != last) {
305: last = n;
1.93 nicm 306:
307: if (stat(socket_path, &sb) != 0)
308: return;
309: mode = sb.st_mode;
310: if (n != 0) {
311: if (mode & S_IRUSR)
312: mode |= S_IXUSR;
313: if (mode & S_IRGRP)
314: mode |= S_IXGRP;
315: if (mode & S_IROTH)
316: mode |= S_IXOTH;
317: } else
318: mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
319: chmod(socket_path, mode);
1.66 nicm 320: }
321: }
322:
323: /* Callback for server socket. */
324: void
325: server_accept_callback(int fd, short events, unused void *data)
326: {
327: struct sockaddr_storage sa;
328: socklen_t slen = sizeof sa;
329: int newfd;
330:
1.104 nicm 331: server_add_accept(0);
1.66 nicm 332: if (!(events & EV_READ))
333: return;
334:
335: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
336: if (newfd == -1) {
337: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
338: return;
1.104 nicm 339: if (errno == ENFILE || errno == EMFILE) {
340: /* Delete and don't try again for 1 second. */
341: server_add_accept(1);
342: return;
343: }
1.66 nicm 344: fatal("accept failed");
345: }
346: if (server_shutdown) {
347: close(newfd);
348: return;
1.42 nicm 349: }
1.66 nicm 350: server_client_create(newfd);
351: }
352:
1.104 nicm 353: /*
354: * Add accept event. If timeout is nonzero, add as a timeout instead of a read
355: * event - used to backoff when running out of file descriptors.
356: */
357: void
358: server_add_accept(int timeout)
359: {
360: struct timeval tv = { timeout, 0 };
361:
362: if (event_initialized(&server_ev_accept))
363: event_del(&server_ev_accept);
364:
365: if (timeout == 0) {
366: event_set(&server_ev_accept,
367: server_fd, EV_READ, server_accept_callback, NULL);
368: event_add(&server_ev_accept, NULL);
369: } else {
370: event_set(&server_ev_accept,
371: server_fd, EV_TIMEOUT, server_accept_callback, NULL);
372: event_add(&server_ev_accept, &tv);
373: }
374: }
375:
1.66 nicm 376: /* Signal handler. */
377: void
378: server_signal_callback(int sig, unused short events, unused void *data)
379: {
380: switch (sig) {
381: case SIGTERM:
382: server_shutdown = 1;
383: server_send_shutdown();
384: break;
385: case SIGCHLD:
386: server_child_signal();
387: break;
388: case SIGUSR1:
389: event_del(&server_ev_accept);
390: close(server_fd);
391: server_fd = server_create_socket();
1.104 nicm 392: server_add_accept(0);
1.66 nicm 393: break;
1.1 nicm 394: }
395: }
396:
397: /* Handle SIGCHLD. */
398: void
399: server_child_signal(void)
400: {
1.66 nicm 401: int status;
402: pid_t pid;
1.1 nicm 403:
404: for (;;) {
405: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
406: case -1:
407: if (errno == ECHILD)
408: return;
1.39 nicm 409: fatal("waitpid failed");
1.1 nicm 410: case 0:
411: return;
412: }
1.66 nicm 413: if (WIFSTOPPED(status))
414: server_child_stopped(pid, status);
1.79 nicm 415: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 416: server_child_exited(pid, status);
417: }
418: }
419:
420: /* Handle exited children. */
421: void
422: server_child_exited(pid_t pid, int status)
423: {
424: struct window *w;
425: struct window_pane *wp;
426: struct job *job;
427: u_int i;
428:
429: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
430: if ((w = ARRAY_ITEM(&windows, i)) == NULL)
431: continue;
432: TAILQ_FOREACH(wp, &w->panes, entry) {
433: if (wp->pid == pid) {
1.77 nicm 434: server_destroy_pane(wp);
435: break;
1.53 nicm 436: }
437: }
1.80 nicm 438: }
1.1 nicm 439:
1.101 nicm 440: LIST_FOREACH(job, &all_jobs, lentry) {
1.66 nicm 441: if (pid == job->pid) {
1.67 nicm 442: job_died(job, status); /* might free job */
443: break;
1.1 nicm 444: }
1.53 nicm 445: }
446: }
447:
1.66 nicm 448: /* Handle stopped children. */
1.31 nicm 449: void
1.66 nicm 450: server_child_stopped(pid_t pid, int status)
1.31 nicm 451: {
1.66 nicm 452: struct window *w;
453: struct window_pane *wp;
454: u_int i;
1.31 nicm 455:
1.66 nicm 456: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
457: return;
1.31 nicm 458:
1.66 nicm 459: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
460: if ((w = ARRAY_ITEM(&windows, i)) == NULL)
1.31 nicm 461: continue;
1.66 nicm 462: TAILQ_FOREACH(wp, &w->panes, entry) {
463: if (wp->pid == pid) {
464: if (killpg(pid, SIGCONT) != 0)
465: kill(pid, SIGCONT);
466: }
467: }
1.31 nicm 468: }
1.1 nicm 469: }
470:
1.66 nicm 471: /* Handle once-per-second timer events. */
1.1 nicm 472: void
1.66 nicm 473: server_second_callback(unused int fd, unused short events, unused void *arg)
1.1 nicm 474: {
1.60 nicm 475: struct window *w;
476: struct window_pane *wp;
1.66 nicm 477: struct timeval tv;
1.35 nicm 478: u_int i;
1.1 nicm 479:
1.60 nicm 480: if (options_get_number(&global_s_options, "lock-server"))
481: server_lock_server();
482: else
483: server_lock_sessions();
1.1 nicm 484:
1.60 nicm 485: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
486: w = ARRAY_ITEM(&windows, i);
487: if (w == NULL)
1.1 nicm 488: continue;
489:
1.60 nicm 490: TAILQ_FOREACH(wp, &w->panes, entry) {
491: if (wp->mode != NULL && wp->mode->timer != NULL)
492: wp->mode->timer(wp);
1.1 nicm 493: }
494: }
1.72 nicm 495:
496: server_client_status_timer();
1.66 nicm 497:
498: evtimer_del(&server_ev_second);
499: memset(&tv, 0, sizeof tv);
500: tv.tv_sec = 1;
501: evtimer_add(&server_ev_second, &tv);
1.1 nicm 502: }
503:
1.46 nicm 504: /* Lock the server if ALL sessions have hit the time limit. */
505: void
506: server_lock_server(void)
507: {
508: struct session *s;
509: int timeout;
510: time_t t;
511:
512: t = time(NULL);
1.97 nicm 513: RB_FOREACH(s, sessions, &sessions) {
1.99 nicm 514: if (s->flags & SESSION_UNATTACHED)
1.59 nicm 515: continue;
1.46 nicm 516: timeout = options_get_number(&s->options, "lock-after-time");
1.65 nicm 517: if (timeout <= 0 || t <= s->activity_time.tv_sec + timeout)
1.46 nicm 518: return; /* not timed out */
519: }
520:
521: server_lock();
522: recalculate_sizes();
523: }
524:
525: /* Lock any sessions which have timed out. */
526: void
527: server_lock_sessions(void)
528: {
1.80 nicm 529: struct session *s;
1.46 nicm 530: int timeout;
1.62 deraadt 531: time_t t;
1.46 nicm 532:
1.62 deraadt 533: t = time(NULL);
1.97 nicm 534: RB_FOREACH(s, sessions, &sessions) {
1.99 nicm 535: if (s->flags & SESSION_UNATTACHED)
1.59 nicm 536: continue;
1.46 nicm 537: timeout = options_get_number(&s->options, "lock-after-time");
1.65 nicm 538: if (timeout > 0 && t > s->activity_time.tv_sec + timeout) {
1.46 nicm 539: server_lock_session(s);
540: recalculate_sizes();
1.1 nicm 541: }
542: }
543: }
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