Annotation of src/usr.bin/tmux/server.c, Revision 1.199
1.199 ! nicm 1: /* $OpenBSD: server.c,v 1.198 2021/06/10 07:45:43 nicm Exp $ */
1.1 nicm 2:
3: /*
1.157 nicm 4: * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
1.1 nicm 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 <termios.h>
35: #include <time.h>
36: #include <unistd.h>
37:
38: #include "tmux.h"
39:
40: /*
41: * Main server functions.
42: */
43:
1.155 nicm 44: struct clients clients;
1.1 nicm 45:
1.155 nicm 46: struct tmuxproc *server_proc;
1.186 nicm 47: static int server_fd = -1;
1.194 nicm 48: static uint64_t server_client_flags;
1.160 nicm 49: static int server_exit;
50: static struct event server_ev_accept;
1.197 nicm 51: static struct event server_ev_tidy;
1.155 nicm 52:
53: struct cmd_find_state marked_pane;
1.126 nicm 54:
1.190 nicm 55: static u_int message_next;
56: struct message_list message_log;
57:
1.160 nicm 58: static int server_loop(void);
59: static void server_send_exit(void);
60: static void server_accept(int, short, void *);
61: static void server_signal(int);
62: static void server_child_signal(void);
63: static void server_child_exited(pid_t, int);
64: static void server_child_stopped(pid_t, int);
1.126 nicm 65:
66: /* Set marked pane. */
67: void
68: server_set_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
69: {
1.169 nicm 70: cmd_find_clear_state(&marked_pane, 0);
1.155 nicm 71: marked_pane.s = s;
72: marked_pane.wl = wl;
73: marked_pane.w = wl->window;
74: marked_pane.wp = wp;
1.126 nicm 75: }
76:
77: /* Clear marked pane. */
78: void
79: server_clear_marked(void)
80: {
1.169 nicm 81: cmd_find_clear_state(&marked_pane, 0);
1.126 nicm 82: }
83:
84: /* Is this the marked pane? */
85: int
86: server_is_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
87: {
88: if (s == NULL || wl == NULL || wp == NULL)
89: return (0);
1.155 nicm 90: if (marked_pane.s != s || marked_pane.wl != wl)
1.126 nicm 91: return (0);
1.155 nicm 92: if (marked_pane.wp != wp)
1.126 nicm 93: return (0);
94: return (server_check_marked());
95: }
96:
97: /* Check if the marked pane is still valid. */
98: int
99: server_check_marked(void)
100: {
1.155 nicm 101: return (cmd_find_valid_state(&marked_pane));
1.126 nicm 102: }
1.45 nicm 103:
1.60 nicm 104: /* Create server socket. */
1.160 nicm 105: static int
1.188 nicm 106: server_create_socket(int flags, char **cause)
1.1 nicm 107: {
1.60 nicm 108: struct sockaddr_un sa;
109: size_t size;
110: mode_t mask;
1.178 nicm 111: int fd, saved_errno;
1.60 nicm 112:
113: memset(&sa, 0, sizeof sa);
114: sa.sun_family = AF_UNIX;
115: size = strlcpy(sa.sun_path, socket_path, sizeof sa.sun_path);
116: if (size >= sizeof sa.sun_path) {
117: errno = ENAMETOOLONG;
1.178 nicm 118: goto fail;
1.60 nicm 119: }
120: unlink(sa.sun_path);
121:
122: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.178 nicm 123: goto fail;
1.60 nicm 124:
1.188 nicm 125: if (flags & CLIENT_DEFAULTSOCKET)
126: mask = umask(S_IXUSR|S_IXGRP|S_IRWXO);
127: else
128: mask = umask(S_IXUSR|S_IRWXG|S_IRWXO);
1.178 nicm 129: if (bind(fd, (struct sockaddr *)&sa, sizeof sa) == -1) {
130: saved_errno = errno;
1.170 nicm 131: close(fd);
1.178 nicm 132: errno = saved_errno;
133: goto fail;
1.170 nicm 134: }
1.60 nicm 135: umask(mask);
136:
1.170 nicm 137: if (listen(fd, 128) == -1) {
1.178 nicm 138: saved_errno = errno;
1.170 nicm 139: close(fd);
1.178 nicm 140: errno = saved_errno;
141: goto fail;
1.170 nicm 142: }
1.100 nicm 143: setblocking(fd, 0);
1.1 nicm 144:
1.60 nicm 145: return (fd);
1.178 nicm 146:
147: fail:
148: if (cause != NULL) {
149: xasprintf(cause, "error creating %s (%s)", socket_path,
150: strerror(errno));
151: }
152: return (-1);
153: }
154:
1.197 nicm 155: /* Tidy up every hour. */
156: static void
157: server_tidy_event(__unused int fd, __unused short events, __unused void *data)
158: {
159: struct timeval tv = { .tv_sec = 3600 };
160: uint64_t t = get_timer();
161:
162: format_tidy_jobs();
163:
1.198 nicm 164: log_debug("%s: took %llu milliseconds", __func__,
165: (unsigned long long)(get_timer() - t));
1.197 nicm 166: evtimer_add(&server_ev_tidy, &tv);
167: }
168:
1.1 nicm 169: /* Fork new server. */
170: int
1.188 nicm 171: server_start(struct tmuxproc *client, int flags, struct event_base *base,
172: int lockfd, char *lockfile)
1.1 nicm 173: {
1.197 nicm 174: int fd;
175: sigset_t set, oldset;
176: struct client *c = NULL;
177: char *cause = NULL;
178: struct timeval tv = { .tv_sec = 3600 };
1.1 nicm 179:
1.175 nicm 180: sigfillset(&set);
181: sigprocmask(SIG_BLOCK, &set, &oldset);
1.191 nicm 182:
183: if (~flags & CLIENT_NOFORK) {
1.196 nicm 184: if (proc_fork_and_daemon(&fd) != 0) {
1.191 nicm 185: sigprocmask(SIG_SETMASK, &oldset, NULL);
1.196 nicm 186: return (fd);
1.191 nicm 187: }
188: }
1.196 nicm 189: proc_clear_signals(client, 0);
1.191 nicm 190: server_client_flags = flags;
191:
1.174 nicm 192: if (event_reinit(base) != 0)
193: fatalx("event_reinit failed");
194: server_proc = proc_start("server");
1.191 nicm 195:
1.174 nicm 196: proc_set_signals(server_proc, server_signal);
1.175 nicm 197: sigprocmask(SIG_SETMASK, &oldset, NULL);
1.143 nicm 198:
1.171 nicm 199: if (log_get_level() > 1)
1.146 nicm 200: tty_create_log();
1.151 nicm 201: if (pledge("stdio rpath wpath cpath fattr unix getpw recvfd proc exec "
202: "tty ps", NULL) != 0)
1.143 nicm 203: fatal("pledge failed");
1.1 nicm 204:
1.192 nicm 205: input_key_build();
1.121 nicm 206: RB_INIT(&windows);
1.102 nicm 207: RB_INIT(&all_window_panes);
1.122 nicm 208: TAILQ_INIT(&clients);
1.97 nicm 209: RB_INIT(&sessions);
1.1 nicm 210: key_bindings_init();
1.190 nicm 211: TAILQ_INIT(&message_log);
1.1 nicm 212:
1.153 nicm 213: gettimeofday(&start_time, NULL);
1.16 nicm 214:
1.188 nicm 215: server_fd = server_create_socket(flags, &cause);
1.178 nicm 216: if (server_fd != -1)
217: server_update_socket();
1.191 nicm 218: if (~flags & CLIENT_NOFORK)
1.196 nicm 219: c = server_client_create(fd);
1.191 nicm 220: else
221: options_set_number(global_options, "exit-empty", 0);
1.103 nicm 222:
1.154 nicm 223: if (lockfd >= 0) {
224: unlink(lockfile);
225: free(lockfile);
226: close(lockfd);
227: }
1.16 nicm 228:
1.178 nicm 229: if (cause != NULL) {
1.195 nicm 230: if (c != NULL) {
1.199 ! nicm 231: c->exit_message = cause;
1.195 nicm 232: c->flags |= CLIENT_EXIT;
1.199 ! nicm 233: } else
! 234: free(cause);
1.187 nicm 235: }
1.197 nicm 236:
237: evtimer_set(&server_ev_tidy, server_tidy_event, NULL);
238: evtimer_add(&server_ev_tidy, &tv);
1.178 nicm 239:
1.104 nicm 240: server_add_accept(0);
1.144 nicm 241: proc_loop(server_proc, server_loop);
1.167 nicm 242:
1.183 nicm 243: job_kill_all();
244: status_prompt_save_history();
1.167 nicm 245:
1.66 nicm 246: exit(0);
1.1 nicm 247: }
248:
1.144 nicm 249: /* Server loop callback. */
1.160 nicm 250: static int
1.66 nicm 251: server_loop(void)
1.1 nicm 252: {
1.144 nicm 253: struct client *c;
1.162 nicm 254: u_int items;
255:
256: do {
257: items = cmdq_next(NULL);
1.164 nicm 258: TAILQ_FOREACH(c, &clients, entry) {
259: if (c->flags & CLIENT_IDENTIFIED)
260: items += cmdq_next(c);
261: }
1.162 nicm 262: } while (items != 0);
1.31 nicm 263:
1.144 nicm 264: server_client_loop();
1.179 nicm 265:
266: if (!options_get_number(global_options, "exit-empty") && !server_exit)
267: return (0);
1.1 nicm 268:
1.145 nicm 269: if (!options_get_number(global_options, "exit-unattached")) {
1.97 nicm 270: if (!RB_EMPTY(&sessions))
271: return (0);
1.1 nicm 272: }
1.116 nicm 273:
1.122 nicm 274: TAILQ_FOREACH(c, &clients, entry) {
275: if (c->session != NULL)
1.116 nicm 276: return (0);
277: }
278:
279: /*
280: * No attached clients therefore want to exit - flush any waiting
281: * clients but don't actually exit until they've gone.
282: */
283: cmd_wait_for_flush();
1.122 nicm 284: if (!TAILQ_EMPTY(&clients))
285: return (0);
1.116 nicm 286:
1.183 nicm 287: if (job_still_running())
288: return (0);
1.180 nicm 289:
1.66 nicm 290: return (1);
1.1 nicm 291: }
292:
1.141 nicm 293: /* Exit the server by killing all clients and windows. */
1.160 nicm 294: static void
1.141 nicm 295: server_send_exit(void)
1.1 nicm 296: {
1.122 nicm 297: struct client *c, *c1;
298: struct session *s, *s1;
1.116 nicm 299:
300: cmd_wait_for_flush();
1.1 nicm 301:
1.122 nicm 302: TAILQ_FOREACH_SAFE(c, &clients, entry, c1) {
1.144 nicm 303: if (c->flags & CLIENT_SUSPENDED)
1.122 nicm 304: server_client_lost(c);
1.180 nicm 305: else {
1.193 nicm 306: c->flags |= CLIENT_EXIT;
307: c->exit_type = CLIENT_EXIT_SHUTDOWN;
1.180 nicm 308: }
1.122 nicm 309: c->session = NULL;
1.42 nicm 310: }
311:
1.122 nicm 312: RB_FOREACH_SAFE(s, sessions, &sessions, s1)
1.184 nicm 313: session_destroy(s, 1, __func__);
1.66 nicm 314: }
315:
316: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 317: void
1.66 nicm 318: server_update_socket(void)
1.42 nicm 319: {
1.66 nicm 320: struct session *s;
321: static int last = -1;
1.93 nicm 322: int n, mode;
323: struct stat sb;
1.1 nicm 324:
1.66 nicm 325: n = 0;
1.97 nicm 326: RB_FOREACH(s, sessions, &sessions) {
1.182 nicm 327: if (s->attached != 0) {
1.66 nicm 328: n++;
329: break;
330: }
331: }
332:
333: if (n != last) {
334: last = n;
1.93 nicm 335:
336: if (stat(socket_path, &sb) != 0)
337: return;
1.159 semarie 338: mode = sb.st_mode & ACCESSPERMS;
1.93 nicm 339: if (n != 0) {
340: if (mode & S_IRUSR)
341: mode |= S_IXUSR;
342: if (mode & S_IRGRP)
343: mode |= S_IXGRP;
344: if (mode & S_IROTH)
345: mode |= S_IXOTH;
346: } else
347: mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
348: chmod(socket_path, mode);
1.66 nicm 349: }
350: }
351:
352: /* Callback for server socket. */
1.160 nicm 353: static void
1.150 nicm 354: server_accept(int fd, short events, __unused void *data)
1.66 nicm 355: {
356: struct sockaddr_storage sa;
357: socklen_t slen = sizeof sa;
358: int newfd;
359:
1.104 nicm 360: server_add_accept(0);
1.66 nicm 361: if (!(events & EV_READ))
362: return;
363:
364: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
365: if (newfd == -1) {
366: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
367: return;
1.104 nicm 368: if (errno == ENFILE || errno == EMFILE) {
369: /* Delete and don't try again for 1 second. */
370: server_add_accept(1);
371: return;
372: }
1.66 nicm 373: fatal("accept failed");
374: }
1.141 nicm 375: if (server_exit) {
1.66 nicm 376: close(newfd);
377: return;
1.42 nicm 378: }
1.66 nicm 379: server_client_create(newfd);
380: }
381:
1.104 nicm 382: /*
383: * Add accept event. If timeout is nonzero, add as a timeout instead of a read
384: * event - used to backoff when running out of file descriptors.
385: */
386: void
387: server_add_accept(int timeout)
388: {
389: struct timeval tv = { timeout, 0 };
1.186 nicm 390:
391: if (server_fd == -1)
392: return;
1.104 nicm 393:
394: if (event_initialized(&server_ev_accept))
395: event_del(&server_ev_accept);
396:
397: if (timeout == 0) {
1.144 nicm 398: event_set(&server_ev_accept, server_fd, EV_READ, server_accept,
399: NULL);
1.104 nicm 400: event_add(&server_ev_accept, NULL);
401: } else {
1.144 nicm 402: event_set(&server_ev_accept, server_fd, EV_TIMEOUT,
403: server_accept, NULL);
1.104 nicm 404: event_add(&server_ev_accept, &tv);
405: }
406: }
407:
1.66 nicm 408: /* Signal handler. */
1.160 nicm 409: static void
1.144 nicm 410: server_signal(int sig)
1.66 nicm 411: {
1.119 nicm 412: int fd;
1.120 nicm 413:
1.173 nicm 414: log_debug("%s: %s", __func__, strsignal(sig));
1.66 nicm 415: switch (sig) {
1.191 nicm 416: case SIGINT:
1.66 nicm 417: case SIGTERM:
1.141 nicm 418: server_exit = 1;
419: server_send_exit();
1.66 nicm 420: break;
421: case SIGCHLD:
422: server_child_signal();
423: break;
424: case SIGUSR1:
425: event_del(&server_ev_accept);
1.188 nicm 426: fd = server_create_socket(server_client_flags, NULL);
1.119 nicm 427: if (fd != -1) {
428: close(server_fd);
429: server_fd = fd;
430: server_update_socket();
431: }
1.104 nicm 432: server_add_accept(0);
1.171 nicm 433: break;
434: case SIGUSR2:
435: proc_toggle_log(server_proc);
1.66 nicm 436: break;
1.1 nicm 437: }
438: }
439:
440: /* Handle SIGCHLD. */
1.160 nicm 441: static void
1.1 nicm 442: server_child_signal(void)
443: {
1.66 nicm 444: int status;
445: pid_t pid;
1.1 nicm 446:
447: for (;;) {
448: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
449: case -1:
450: if (errno == ECHILD)
451: return;
1.39 nicm 452: fatal("waitpid failed");
1.1 nicm 453: case 0:
454: return;
455: }
1.66 nicm 456: if (WIFSTOPPED(status))
457: server_child_stopped(pid, status);
1.79 nicm 458: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 459: server_child_exited(pid, status);
460: }
461: }
462:
463: /* Handle exited children. */
1.160 nicm 464: static void
1.66 nicm 465: server_child_exited(pid_t pid, int status)
466: {
1.121 nicm 467: struct window *w, *w1;
1.66 nicm 468: struct window_pane *wp;
469:
1.121 nicm 470: RB_FOREACH_SAFE(w, windows, &windows, w1) {
1.66 nicm 471: TAILQ_FOREACH(wp, &w->panes, entry) {
472: if (wp->pid == pid) {
1.118 nicm 473: wp->status = status;
1.177 nicm 474: wp->flags |= PANE_STATUSREADY;
1.172 nicm 475:
476: log_debug("%%%u exited", wp->id);
477: wp->flags |= PANE_EXITED;
478:
479: if (window_pane_destroy_ready(wp))
480: server_destroy_pane(wp, 1);
1.77 nicm 481: break;
1.53 nicm 482: }
483: }
1.80 nicm 484: }
1.183 nicm 485: job_check_died(pid, status);
1.53 nicm 486: }
487:
1.66 nicm 488: /* Handle stopped children. */
1.160 nicm 489: static void
1.66 nicm 490: server_child_stopped(pid_t pid, int status)
1.31 nicm 491: {
1.66 nicm 492: struct window *w;
493: struct window_pane *wp;
1.31 nicm 494:
1.66 nicm 495: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
496: return;
1.31 nicm 497:
1.121 nicm 498: RB_FOREACH(w, windows, &windows) {
1.66 nicm 499: TAILQ_FOREACH(wp, &w->panes, entry) {
500: if (wp->pid == pid) {
501: if (killpg(pid, SIGCONT) != 0)
502: kill(pid, SIGCONT);
503: }
1.1 nicm 504: }
505: }
1.189 nicm 506: job_check_died(pid, status);
1.190 nicm 507: }
508:
509: /* Add to message log. */
510: void
511: server_add_message(const char *fmt, ...)
512: {
513: struct message_entry *msg, *msg1;
514: char *s;
515: va_list ap;
516: u_int limit;
517:
518: va_start(ap, fmt);
519: xvasprintf(&s, fmt, ap);
520: va_end(ap);
521:
522: log_debug("message: %s", s);
523:
524: msg = xcalloc(1, sizeof *msg);
525: gettimeofday(&msg->msg_time, NULL);
526: msg->msg_num = message_next++;
527: msg->msg = s;
528: TAILQ_INSERT_TAIL(&message_log, msg, entry);
529:
530: limit = options_get_number(global_options, "message-limit");
531: TAILQ_FOREACH_SAFE(msg, &message_log, entry, msg1) {
532: if (msg->msg_num + limit >= message_next)
533: break;
534: free(msg->msg);
535: TAILQ_REMOVE(&message_log, msg, entry);
536: free(msg);
537: }
1.1 nicm 538: }
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