Annotation of src/usr.bin/tmux/server.c, Revision 1.200
1.200 ! nicm 1: /* $OpenBSD: server.c,v 1.199 2022/03/25 06:14:42 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;
1.200 ! nicm 233: } else {
! 234: fprintf(stderr, "%s\n", cause);
! 235: exit(1);
! 236: }
1.187 nicm 237: }
1.197 nicm 238:
239: evtimer_set(&server_ev_tidy, server_tidy_event, NULL);
240: evtimer_add(&server_ev_tidy, &tv);
1.178 nicm 241:
1.104 nicm 242: server_add_accept(0);
1.144 nicm 243: proc_loop(server_proc, server_loop);
1.167 nicm 244:
1.183 nicm 245: job_kill_all();
246: status_prompt_save_history();
1.167 nicm 247:
1.66 nicm 248: exit(0);
1.1 nicm 249: }
250:
1.144 nicm 251: /* Server loop callback. */
1.160 nicm 252: static int
1.66 nicm 253: server_loop(void)
1.1 nicm 254: {
1.144 nicm 255: struct client *c;
1.162 nicm 256: u_int items;
257:
258: do {
259: items = cmdq_next(NULL);
1.164 nicm 260: TAILQ_FOREACH(c, &clients, entry) {
261: if (c->flags & CLIENT_IDENTIFIED)
262: items += cmdq_next(c);
263: }
1.162 nicm 264: } while (items != 0);
1.31 nicm 265:
1.144 nicm 266: server_client_loop();
1.179 nicm 267:
268: if (!options_get_number(global_options, "exit-empty") && !server_exit)
269: return (0);
1.1 nicm 270:
1.145 nicm 271: if (!options_get_number(global_options, "exit-unattached")) {
1.97 nicm 272: if (!RB_EMPTY(&sessions))
273: return (0);
1.1 nicm 274: }
1.116 nicm 275:
1.122 nicm 276: TAILQ_FOREACH(c, &clients, entry) {
277: if (c->session != NULL)
1.116 nicm 278: return (0);
279: }
280:
281: /*
282: * No attached clients therefore want to exit - flush any waiting
283: * clients but don't actually exit until they've gone.
284: */
285: cmd_wait_for_flush();
1.122 nicm 286: if (!TAILQ_EMPTY(&clients))
287: return (0);
1.116 nicm 288:
1.183 nicm 289: if (job_still_running())
290: return (0);
1.180 nicm 291:
1.66 nicm 292: return (1);
1.1 nicm 293: }
294:
1.141 nicm 295: /* Exit the server by killing all clients and windows. */
1.160 nicm 296: static void
1.141 nicm 297: server_send_exit(void)
1.1 nicm 298: {
1.122 nicm 299: struct client *c, *c1;
300: struct session *s, *s1;
1.116 nicm 301:
302: cmd_wait_for_flush();
1.1 nicm 303:
1.122 nicm 304: TAILQ_FOREACH_SAFE(c, &clients, entry, c1) {
1.144 nicm 305: if (c->flags & CLIENT_SUSPENDED)
1.122 nicm 306: server_client_lost(c);
1.180 nicm 307: else {
1.193 nicm 308: c->flags |= CLIENT_EXIT;
309: c->exit_type = CLIENT_EXIT_SHUTDOWN;
1.180 nicm 310: }
1.122 nicm 311: c->session = NULL;
1.42 nicm 312: }
313:
1.122 nicm 314: RB_FOREACH_SAFE(s, sessions, &sessions, s1)
1.184 nicm 315: session_destroy(s, 1, __func__);
1.66 nicm 316: }
317:
318: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 319: void
1.66 nicm 320: server_update_socket(void)
1.42 nicm 321: {
1.66 nicm 322: struct session *s;
323: static int last = -1;
1.93 nicm 324: int n, mode;
325: struct stat sb;
1.1 nicm 326:
1.66 nicm 327: n = 0;
1.97 nicm 328: RB_FOREACH(s, sessions, &sessions) {
1.182 nicm 329: if (s->attached != 0) {
1.66 nicm 330: n++;
331: break;
332: }
333: }
334:
335: if (n != last) {
336: last = n;
1.93 nicm 337:
338: if (stat(socket_path, &sb) != 0)
339: return;
1.159 semarie 340: mode = sb.st_mode & ACCESSPERMS;
1.93 nicm 341: if (n != 0) {
342: if (mode & S_IRUSR)
343: mode |= S_IXUSR;
344: if (mode & S_IRGRP)
345: mode |= S_IXGRP;
346: if (mode & S_IROTH)
347: mode |= S_IXOTH;
348: } else
349: mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
350: chmod(socket_path, mode);
1.66 nicm 351: }
352: }
353:
354: /* Callback for server socket. */
1.160 nicm 355: static void
1.150 nicm 356: server_accept(int fd, short events, __unused void *data)
1.66 nicm 357: {
358: struct sockaddr_storage sa;
359: socklen_t slen = sizeof sa;
360: int newfd;
361:
1.104 nicm 362: server_add_accept(0);
1.66 nicm 363: if (!(events & EV_READ))
364: return;
365:
366: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
367: if (newfd == -1) {
368: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
369: return;
1.104 nicm 370: if (errno == ENFILE || errno == EMFILE) {
371: /* Delete and don't try again for 1 second. */
372: server_add_accept(1);
373: return;
374: }
1.66 nicm 375: fatal("accept failed");
376: }
1.141 nicm 377: if (server_exit) {
1.66 nicm 378: close(newfd);
379: return;
1.42 nicm 380: }
1.66 nicm 381: server_client_create(newfd);
382: }
383:
1.104 nicm 384: /*
385: * Add accept event. If timeout is nonzero, add as a timeout instead of a read
386: * event - used to backoff when running out of file descriptors.
387: */
388: void
389: server_add_accept(int timeout)
390: {
391: struct timeval tv = { timeout, 0 };
1.186 nicm 392:
393: if (server_fd == -1)
394: return;
1.104 nicm 395:
396: if (event_initialized(&server_ev_accept))
397: event_del(&server_ev_accept);
398:
399: if (timeout == 0) {
1.144 nicm 400: event_set(&server_ev_accept, server_fd, EV_READ, server_accept,
401: NULL);
1.104 nicm 402: event_add(&server_ev_accept, NULL);
403: } else {
1.144 nicm 404: event_set(&server_ev_accept, server_fd, EV_TIMEOUT,
405: server_accept, NULL);
1.104 nicm 406: event_add(&server_ev_accept, &tv);
407: }
408: }
409:
1.66 nicm 410: /* Signal handler. */
1.160 nicm 411: static void
1.144 nicm 412: server_signal(int sig)
1.66 nicm 413: {
1.119 nicm 414: int fd;
1.120 nicm 415:
1.173 nicm 416: log_debug("%s: %s", __func__, strsignal(sig));
1.66 nicm 417: switch (sig) {
1.191 nicm 418: case SIGINT:
1.66 nicm 419: case SIGTERM:
1.141 nicm 420: server_exit = 1;
421: server_send_exit();
1.66 nicm 422: break;
423: case SIGCHLD:
424: server_child_signal();
425: break;
426: case SIGUSR1:
427: event_del(&server_ev_accept);
1.188 nicm 428: fd = server_create_socket(server_client_flags, NULL);
1.119 nicm 429: if (fd != -1) {
430: close(server_fd);
431: server_fd = fd;
432: server_update_socket();
433: }
1.104 nicm 434: server_add_accept(0);
1.171 nicm 435: break;
436: case SIGUSR2:
437: proc_toggle_log(server_proc);
1.66 nicm 438: break;
1.1 nicm 439: }
440: }
441:
442: /* Handle SIGCHLD. */
1.160 nicm 443: static void
1.1 nicm 444: server_child_signal(void)
445: {
1.66 nicm 446: int status;
447: pid_t pid;
1.1 nicm 448:
449: for (;;) {
450: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
451: case -1:
452: if (errno == ECHILD)
453: return;
1.39 nicm 454: fatal("waitpid failed");
1.1 nicm 455: case 0:
456: return;
457: }
1.66 nicm 458: if (WIFSTOPPED(status))
459: server_child_stopped(pid, status);
1.79 nicm 460: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 461: server_child_exited(pid, status);
462: }
463: }
464:
465: /* Handle exited children. */
1.160 nicm 466: static void
1.66 nicm 467: server_child_exited(pid_t pid, int status)
468: {
1.121 nicm 469: struct window *w, *w1;
1.66 nicm 470: struct window_pane *wp;
471:
1.121 nicm 472: RB_FOREACH_SAFE(w, windows, &windows, w1) {
1.66 nicm 473: TAILQ_FOREACH(wp, &w->panes, entry) {
474: if (wp->pid == pid) {
1.118 nicm 475: wp->status = status;
1.177 nicm 476: wp->flags |= PANE_STATUSREADY;
1.172 nicm 477:
478: log_debug("%%%u exited", wp->id);
479: wp->flags |= PANE_EXITED;
480:
481: if (window_pane_destroy_ready(wp))
482: server_destroy_pane(wp, 1);
1.77 nicm 483: break;
1.53 nicm 484: }
485: }
1.80 nicm 486: }
1.183 nicm 487: job_check_died(pid, status);
1.53 nicm 488: }
489:
1.66 nicm 490: /* Handle stopped children. */
1.160 nicm 491: static void
1.66 nicm 492: server_child_stopped(pid_t pid, int status)
1.31 nicm 493: {
1.66 nicm 494: struct window *w;
495: struct window_pane *wp;
1.31 nicm 496:
1.66 nicm 497: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
498: return;
1.31 nicm 499:
1.121 nicm 500: RB_FOREACH(w, windows, &windows) {
1.66 nicm 501: TAILQ_FOREACH(wp, &w->panes, entry) {
502: if (wp->pid == pid) {
503: if (killpg(pid, SIGCONT) != 0)
504: kill(pid, SIGCONT);
505: }
1.1 nicm 506: }
507: }
1.189 nicm 508: job_check_died(pid, status);
1.190 nicm 509: }
510:
511: /* Add to message log. */
512: void
513: server_add_message(const char *fmt, ...)
514: {
515: struct message_entry *msg, *msg1;
516: char *s;
517: va_list ap;
518: u_int limit;
519:
520: va_start(ap, fmt);
521: xvasprintf(&s, fmt, ap);
522: va_end(ap);
523:
524: log_debug("message: %s", s);
525:
526: msg = xcalloc(1, sizeof *msg);
527: gettimeofday(&msg->msg_time, NULL);
528: msg->msg_num = message_next++;
529: msg->msg = s;
530: TAILQ_INSERT_TAIL(&message_log, msg, entry);
531:
532: limit = options_get_number(global_options, "message-limit");
533: TAILQ_FOREACH_SAFE(msg, &message_log, entry, msg1) {
534: if (msg->msg_num + limit >= message_next)
535: break;
536: free(msg->msg);
537: TAILQ_REMOVE(&message_log, msg, entry);
538: free(msg);
539: }
1.1 nicm 540: }
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