Annotation of src/usr.bin/tmux/server.c, Revision 1.201
1.201 ! nicm 1: /* $OpenBSD: server.c,v 1.200 2022/03/28 07:40:57 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:
1.201 ! nicm 242: server_acl_init();
! 243:
1.104 nicm 244: server_add_accept(0);
1.144 nicm 245: proc_loop(server_proc, server_loop);
1.167 nicm 246:
1.183 nicm 247: job_kill_all();
248: status_prompt_save_history();
1.167 nicm 249:
1.66 nicm 250: exit(0);
1.1 nicm 251: }
252:
1.144 nicm 253: /* Server loop callback. */
1.160 nicm 254: static int
1.66 nicm 255: server_loop(void)
1.1 nicm 256: {
1.144 nicm 257: struct client *c;
1.162 nicm 258: u_int items;
259:
260: do {
261: items = cmdq_next(NULL);
1.164 nicm 262: TAILQ_FOREACH(c, &clients, entry) {
263: if (c->flags & CLIENT_IDENTIFIED)
264: items += cmdq_next(c);
265: }
1.162 nicm 266: } while (items != 0);
1.31 nicm 267:
1.144 nicm 268: server_client_loop();
1.179 nicm 269:
270: if (!options_get_number(global_options, "exit-empty") && !server_exit)
271: return (0);
1.1 nicm 272:
1.145 nicm 273: if (!options_get_number(global_options, "exit-unattached")) {
1.97 nicm 274: if (!RB_EMPTY(&sessions))
275: return (0);
1.1 nicm 276: }
1.116 nicm 277:
1.122 nicm 278: TAILQ_FOREACH(c, &clients, entry) {
279: if (c->session != NULL)
1.116 nicm 280: return (0);
281: }
282:
283: /*
284: * No attached clients therefore want to exit - flush any waiting
285: * clients but don't actually exit until they've gone.
286: */
287: cmd_wait_for_flush();
1.122 nicm 288: if (!TAILQ_EMPTY(&clients))
289: return (0);
1.116 nicm 290:
1.183 nicm 291: if (job_still_running())
292: return (0);
1.180 nicm 293:
1.66 nicm 294: return (1);
1.1 nicm 295: }
296:
1.141 nicm 297: /* Exit the server by killing all clients and windows. */
1.160 nicm 298: static void
1.141 nicm 299: server_send_exit(void)
1.1 nicm 300: {
1.122 nicm 301: struct client *c, *c1;
302: struct session *s, *s1;
1.116 nicm 303:
304: cmd_wait_for_flush();
1.1 nicm 305:
1.122 nicm 306: TAILQ_FOREACH_SAFE(c, &clients, entry, c1) {
1.144 nicm 307: if (c->flags & CLIENT_SUSPENDED)
1.122 nicm 308: server_client_lost(c);
1.180 nicm 309: else {
1.193 nicm 310: c->flags |= CLIENT_EXIT;
311: c->exit_type = CLIENT_EXIT_SHUTDOWN;
1.180 nicm 312: }
1.122 nicm 313: c->session = NULL;
1.42 nicm 314: }
315:
1.122 nicm 316: RB_FOREACH_SAFE(s, sessions, &sessions, s1)
1.184 nicm 317: session_destroy(s, 1, __func__);
1.66 nicm 318: }
319:
320: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 321: void
1.66 nicm 322: server_update_socket(void)
1.42 nicm 323: {
1.66 nicm 324: struct session *s;
325: static int last = -1;
1.93 nicm 326: int n, mode;
327: struct stat sb;
1.1 nicm 328:
1.66 nicm 329: n = 0;
1.97 nicm 330: RB_FOREACH(s, sessions, &sessions) {
1.182 nicm 331: if (s->attached != 0) {
1.66 nicm 332: n++;
333: break;
334: }
335: }
336:
337: if (n != last) {
338: last = n;
1.93 nicm 339:
340: if (stat(socket_path, &sb) != 0)
341: return;
1.159 semarie 342: mode = sb.st_mode & ACCESSPERMS;
1.93 nicm 343: if (n != 0) {
344: if (mode & S_IRUSR)
345: mode |= S_IXUSR;
346: if (mode & S_IRGRP)
347: mode |= S_IXGRP;
348: if (mode & S_IROTH)
349: mode |= S_IXOTH;
350: } else
351: mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
352: chmod(socket_path, mode);
1.66 nicm 353: }
354: }
355:
356: /* Callback for server socket. */
1.160 nicm 357: static void
1.150 nicm 358: server_accept(int fd, short events, __unused void *data)
1.66 nicm 359: {
1.201 ! nicm 360: struct sockaddr_storage sa;
! 361: socklen_t slen = sizeof sa;
! 362: int newfd;
! 363: struct client *c;
1.66 nicm 364:
1.104 nicm 365: server_add_accept(0);
1.66 nicm 366: if (!(events & EV_READ))
367: return;
368:
369: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
370: if (newfd == -1) {
371: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
372: return;
1.104 nicm 373: if (errno == ENFILE || errno == EMFILE) {
374: /* Delete and don't try again for 1 second. */
375: server_add_accept(1);
376: return;
377: }
1.66 nicm 378: fatal("accept failed");
379: }
1.201 ! nicm 380:
1.141 nicm 381: if (server_exit) {
1.66 nicm 382: close(newfd);
383: return;
1.42 nicm 384: }
1.201 ! nicm 385: c = server_client_create(newfd);
! 386: if (!server_acl_join(c)) {
! 387: c->exit_message = xstrdup("access not allowed");
! 388: c->flags |= CLIENT_EXIT;
! 389: }
1.66 nicm 390: }
391:
1.104 nicm 392: /*
393: * Add accept event. If timeout is nonzero, add as a timeout instead of a read
394: * event - used to backoff when running out of file descriptors.
395: */
396: void
397: server_add_accept(int timeout)
398: {
399: struct timeval tv = { timeout, 0 };
1.186 nicm 400:
401: if (server_fd == -1)
402: return;
1.104 nicm 403:
404: if (event_initialized(&server_ev_accept))
405: event_del(&server_ev_accept);
406:
407: if (timeout == 0) {
1.144 nicm 408: event_set(&server_ev_accept, server_fd, EV_READ, server_accept,
409: NULL);
1.104 nicm 410: event_add(&server_ev_accept, NULL);
411: } else {
1.144 nicm 412: event_set(&server_ev_accept, server_fd, EV_TIMEOUT,
413: server_accept, NULL);
1.104 nicm 414: event_add(&server_ev_accept, &tv);
415: }
416: }
417:
1.66 nicm 418: /* Signal handler. */
1.160 nicm 419: static void
1.144 nicm 420: server_signal(int sig)
1.66 nicm 421: {
1.119 nicm 422: int fd;
1.120 nicm 423:
1.173 nicm 424: log_debug("%s: %s", __func__, strsignal(sig));
1.66 nicm 425: switch (sig) {
1.191 nicm 426: case SIGINT:
1.66 nicm 427: case SIGTERM:
1.141 nicm 428: server_exit = 1;
429: server_send_exit();
1.66 nicm 430: break;
431: case SIGCHLD:
432: server_child_signal();
433: break;
434: case SIGUSR1:
435: event_del(&server_ev_accept);
1.188 nicm 436: fd = server_create_socket(server_client_flags, NULL);
1.119 nicm 437: if (fd != -1) {
438: close(server_fd);
439: server_fd = fd;
440: server_update_socket();
441: }
1.104 nicm 442: server_add_accept(0);
1.171 nicm 443: break;
444: case SIGUSR2:
445: proc_toggle_log(server_proc);
1.66 nicm 446: break;
1.1 nicm 447: }
448: }
449:
450: /* Handle SIGCHLD. */
1.160 nicm 451: static void
1.1 nicm 452: server_child_signal(void)
453: {
1.66 nicm 454: int status;
455: pid_t pid;
1.1 nicm 456:
457: for (;;) {
458: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
459: case -1:
460: if (errno == ECHILD)
461: return;
1.39 nicm 462: fatal("waitpid failed");
1.1 nicm 463: case 0:
464: return;
465: }
1.66 nicm 466: if (WIFSTOPPED(status))
467: server_child_stopped(pid, status);
1.79 nicm 468: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 469: server_child_exited(pid, status);
470: }
471: }
472:
473: /* Handle exited children. */
1.160 nicm 474: static void
1.66 nicm 475: server_child_exited(pid_t pid, int status)
476: {
1.121 nicm 477: struct window *w, *w1;
1.66 nicm 478: struct window_pane *wp;
479:
1.121 nicm 480: RB_FOREACH_SAFE(w, windows, &windows, w1) {
1.66 nicm 481: TAILQ_FOREACH(wp, &w->panes, entry) {
482: if (wp->pid == pid) {
1.118 nicm 483: wp->status = status;
1.177 nicm 484: wp->flags |= PANE_STATUSREADY;
1.172 nicm 485:
486: log_debug("%%%u exited", wp->id);
487: wp->flags |= PANE_EXITED;
488:
489: if (window_pane_destroy_ready(wp))
490: server_destroy_pane(wp, 1);
1.77 nicm 491: break;
1.53 nicm 492: }
493: }
1.80 nicm 494: }
1.183 nicm 495: job_check_died(pid, status);
1.53 nicm 496: }
497:
1.66 nicm 498: /* Handle stopped children. */
1.160 nicm 499: static void
1.66 nicm 500: server_child_stopped(pid_t pid, int status)
1.31 nicm 501: {
1.66 nicm 502: struct window *w;
503: struct window_pane *wp;
1.31 nicm 504:
1.66 nicm 505: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
506: return;
1.31 nicm 507:
1.121 nicm 508: RB_FOREACH(w, windows, &windows) {
1.66 nicm 509: TAILQ_FOREACH(wp, &w->panes, entry) {
510: if (wp->pid == pid) {
511: if (killpg(pid, SIGCONT) != 0)
512: kill(pid, SIGCONT);
513: }
1.1 nicm 514: }
515: }
1.189 nicm 516: job_check_died(pid, status);
1.190 nicm 517: }
518:
519: /* Add to message log. */
520: void
521: server_add_message(const char *fmt, ...)
522: {
523: struct message_entry *msg, *msg1;
524: char *s;
525: va_list ap;
526: u_int limit;
527:
528: va_start(ap, fmt);
529: xvasprintf(&s, fmt, ap);
530: va_end(ap);
531:
532: log_debug("message: %s", s);
533:
534: msg = xcalloc(1, sizeof *msg);
535: gettimeofday(&msg->msg_time, NULL);
536: msg->msg_num = message_next++;
537: msg->msg = s;
538: TAILQ_INSERT_TAIL(&message_log, msg, entry);
539:
540: limit = options_get_number(global_options, "message-limit");
541: TAILQ_FOREACH_SAFE(msg, &message_log, entry, msg1) {
542: if (msg->msg_num + limit >= message_next)
543: break;
544: free(msg->msg);
545: TAILQ_REMOVE(&message_log, msg, entry);
546: free(msg);
547: }
1.1 nicm 548: }
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