Annotation of src/usr.bin/tmux/server.c, Revision 1.205
1.205 ! nicm 1: /* $OpenBSD: server.c,v 1.204 2023/09/01 14:29:11 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:
1.202 nicm 58: time_t current_time;
59:
1.160 nicm 60: static int server_loop(void);
61: static void server_send_exit(void);
62: static void server_accept(int, short, void *);
63: static void server_signal(int);
64: static void server_child_signal(void);
65: static void server_child_exited(pid_t, int);
66: static void server_child_stopped(pid_t, int);
1.126 nicm 67:
68: /* Set marked pane. */
69: void
70: server_set_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
71: {
1.169 nicm 72: cmd_find_clear_state(&marked_pane, 0);
1.155 nicm 73: marked_pane.s = s;
74: marked_pane.wl = wl;
75: marked_pane.w = wl->window;
76: marked_pane.wp = wp;
1.126 nicm 77: }
78:
79: /* Clear marked pane. */
80: void
81: server_clear_marked(void)
82: {
1.169 nicm 83: cmd_find_clear_state(&marked_pane, 0);
1.126 nicm 84: }
85:
86: /* Is this the marked pane? */
87: int
88: server_is_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
89: {
90: if (s == NULL || wl == NULL || wp == NULL)
91: return (0);
1.155 nicm 92: if (marked_pane.s != s || marked_pane.wl != wl)
1.126 nicm 93: return (0);
1.155 nicm 94: if (marked_pane.wp != wp)
1.126 nicm 95: return (0);
96: return (server_check_marked());
97: }
98:
99: /* Check if the marked pane is still valid. */
100: int
101: server_check_marked(void)
102: {
1.155 nicm 103: return (cmd_find_valid_state(&marked_pane));
1.126 nicm 104: }
1.45 nicm 105:
1.60 nicm 106: /* Create server socket. */
1.160 nicm 107: static int
1.188 nicm 108: server_create_socket(int flags, char **cause)
1.1 nicm 109: {
1.60 nicm 110: struct sockaddr_un sa;
111: size_t size;
112: mode_t mask;
1.178 nicm 113: int fd, saved_errno;
1.60 nicm 114:
115: memset(&sa, 0, sizeof sa);
116: sa.sun_family = AF_UNIX;
117: size = strlcpy(sa.sun_path, socket_path, sizeof sa.sun_path);
118: if (size >= sizeof sa.sun_path) {
119: errno = ENAMETOOLONG;
1.178 nicm 120: goto fail;
1.60 nicm 121: }
122: unlink(sa.sun_path);
123:
124: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.178 nicm 125: goto fail;
1.60 nicm 126:
1.188 nicm 127: if (flags & CLIENT_DEFAULTSOCKET)
128: mask = umask(S_IXUSR|S_IXGRP|S_IRWXO);
129: else
130: mask = umask(S_IXUSR|S_IRWXG|S_IRWXO);
1.178 nicm 131: if (bind(fd, (struct sockaddr *)&sa, sizeof sa) == -1) {
132: saved_errno = errno;
1.170 nicm 133: close(fd);
1.178 nicm 134: errno = saved_errno;
135: goto fail;
1.170 nicm 136: }
1.60 nicm 137: umask(mask);
138:
1.170 nicm 139: if (listen(fd, 128) == -1) {
1.178 nicm 140: saved_errno = errno;
1.170 nicm 141: close(fd);
1.178 nicm 142: errno = saved_errno;
143: goto fail;
1.170 nicm 144: }
1.100 nicm 145: setblocking(fd, 0);
1.1 nicm 146:
1.60 nicm 147: return (fd);
1.178 nicm 148:
149: fail:
150: if (cause != NULL) {
151: xasprintf(cause, "error creating %s (%s)", socket_path,
152: strerror(errno));
153: }
154: return (-1);
155: }
156:
1.197 nicm 157: /* Tidy up every hour. */
158: static void
159: server_tidy_event(__unused int fd, __unused short events, __unused void *data)
160: {
161: struct timeval tv = { .tv_sec = 3600 };
162: uint64_t t = get_timer();
163:
164: format_tidy_jobs();
165:
1.198 nicm 166: log_debug("%s: took %llu milliseconds", __func__,
167: (unsigned long long)(get_timer() - t));
1.197 nicm 168: evtimer_add(&server_ev_tidy, &tv);
169: }
170:
1.1 nicm 171: /* Fork new server. */
172: int
1.188 nicm 173: server_start(struct tmuxproc *client, int flags, struct event_base *base,
174: int lockfd, char *lockfile)
1.1 nicm 175: {
1.197 nicm 176: int fd;
177: sigset_t set, oldset;
178: struct client *c = NULL;
179: char *cause = NULL;
180: struct timeval tv = { .tv_sec = 3600 };
1.1 nicm 181:
1.175 nicm 182: sigfillset(&set);
183: sigprocmask(SIG_BLOCK, &set, &oldset);
1.191 nicm 184:
185: if (~flags & CLIENT_NOFORK) {
1.196 nicm 186: if (proc_fork_and_daemon(&fd) != 0) {
1.191 nicm 187: sigprocmask(SIG_SETMASK, &oldset, NULL);
1.196 nicm 188: return (fd);
1.191 nicm 189: }
190: }
1.196 nicm 191: proc_clear_signals(client, 0);
1.191 nicm 192: server_client_flags = flags;
193:
1.174 nicm 194: if (event_reinit(base) != 0)
195: fatalx("event_reinit failed");
196: server_proc = proc_start("server");
1.191 nicm 197:
1.174 nicm 198: proc_set_signals(server_proc, server_signal);
1.175 nicm 199: sigprocmask(SIG_SETMASK, &oldset, NULL);
1.143 nicm 200:
1.171 nicm 201: if (log_get_level() > 1)
1.146 nicm 202: tty_create_log();
1.151 nicm 203: if (pledge("stdio rpath wpath cpath fattr unix getpw recvfd proc exec "
204: "tty ps", NULL) != 0)
1.143 nicm 205: fatal("pledge failed");
1.1 nicm 206:
1.192 nicm 207: input_key_build();
1.121 nicm 208: RB_INIT(&windows);
1.102 nicm 209: RB_INIT(&all_window_panes);
1.122 nicm 210: TAILQ_INIT(&clients);
1.97 nicm 211: RB_INIT(&sessions);
1.1 nicm 212: key_bindings_init();
1.190 nicm 213: TAILQ_INIT(&message_log);
1.153 nicm 214: gettimeofday(&start_time, NULL);
1.16 nicm 215:
1.188 nicm 216: server_fd = server_create_socket(flags, &cause);
1.178 nicm 217: if (server_fd != -1)
218: server_update_socket();
1.191 nicm 219: if (~flags & CLIENT_NOFORK)
1.196 nicm 220: c = server_client_create(fd);
1.191 nicm 221: else
222: options_set_number(global_options, "exit-empty", 0);
1.103 nicm 223:
1.154 nicm 224: if (lockfd >= 0) {
225: unlink(lockfile);
226: free(lockfile);
227: close(lockfd);
228: }
1.16 nicm 229:
1.178 nicm 230: if (cause != NULL) {
1.195 nicm 231: if (c != NULL) {
1.199 nicm 232: c->exit_message = cause;
1.195 nicm 233: c->flags |= CLIENT_EXIT;
1.200 nicm 234: } else {
235: fprintf(stderr, "%s\n", cause);
236: exit(1);
237: }
1.187 nicm 238: }
1.197 nicm 239:
240: evtimer_set(&server_ev_tidy, server_tidy_event, NULL);
241: evtimer_add(&server_ev_tidy, &tv);
1.178 nicm 242:
1.201 nicm 243: server_acl_init();
244:
1.104 nicm 245: server_add_accept(0);
1.144 nicm 246: proc_loop(server_proc, server_loop);
1.167 nicm 247:
1.183 nicm 248: job_kill_all();
249: status_prompt_save_history();
1.167 nicm 250:
1.66 nicm 251: exit(0);
1.1 nicm 252: }
253:
1.144 nicm 254: /* Server loop callback. */
1.160 nicm 255: static int
1.66 nicm 256: server_loop(void)
1.1 nicm 257: {
1.144 nicm 258: struct client *c;
1.162 nicm 259: u_int items;
1.202 nicm 260:
261: current_time = time (NULL);
1.162 nicm 262:
263: do {
264: items = cmdq_next(NULL);
1.164 nicm 265: TAILQ_FOREACH(c, &clients, entry) {
266: if (c->flags & CLIENT_IDENTIFIED)
267: items += cmdq_next(c);
268: }
1.162 nicm 269: } while (items != 0);
1.31 nicm 270:
1.144 nicm 271: server_client_loop();
1.179 nicm 272:
273: if (!options_get_number(global_options, "exit-empty") && !server_exit)
274: return (0);
1.1 nicm 275:
1.145 nicm 276: if (!options_get_number(global_options, "exit-unattached")) {
1.97 nicm 277: if (!RB_EMPTY(&sessions))
278: return (0);
1.1 nicm 279: }
1.116 nicm 280:
1.122 nicm 281: TAILQ_FOREACH(c, &clients, entry) {
282: if (c->session != NULL)
1.116 nicm 283: return (0);
284: }
285:
286: /*
287: * No attached clients therefore want to exit - flush any waiting
288: * clients but don't actually exit until they've gone.
289: */
290: cmd_wait_for_flush();
1.122 nicm 291: if (!TAILQ_EMPTY(&clients))
292: return (0);
1.116 nicm 293:
1.183 nicm 294: if (job_still_running())
295: return (0);
1.180 nicm 296:
1.66 nicm 297: return (1);
1.1 nicm 298: }
299:
1.141 nicm 300: /* Exit the server by killing all clients and windows. */
1.160 nicm 301: static void
1.141 nicm 302: server_send_exit(void)
1.1 nicm 303: {
1.122 nicm 304: struct client *c, *c1;
305: struct session *s, *s1;
1.116 nicm 306:
307: cmd_wait_for_flush();
1.1 nicm 308:
1.122 nicm 309: TAILQ_FOREACH_SAFE(c, &clients, entry, c1) {
1.144 nicm 310: if (c->flags & CLIENT_SUSPENDED)
1.122 nicm 311: server_client_lost(c);
1.180 nicm 312: else {
1.193 nicm 313: c->flags |= CLIENT_EXIT;
314: c->exit_type = CLIENT_EXIT_SHUTDOWN;
1.180 nicm 315: }
1.122 nicm 316: c->session = NULL;
1.42 nicm 317: }
318:
1.122 nicm 319: RB_FOREACH_SAFE(s, sessions, &sessions, s1)
1.184 nicm 320: session_destroy(s, 1, __func__);
1.66 nicm 321: }
322:
323: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 324: void
1.66 nicm 325: server_update_socket(void)
1.42 nicm 326: {
1.66 nicm 327: struct session *s;
328: static int last = -1;
1.93 nicm 329: int n, mode;
330: struct stat sb;
1.1 nicm 331:
1.66 nicm 332: n = 0;
1.97 nicm 333: RB_FOREACH(s, sessions, &sessions) {
1.182 nicm 334: if (s->attached != 0) {
1.66 nicm 335: n++;
336: break;
337: }
338: }
339:
340: if (n != last) {
341: last = n;
1.93 nicm 342:
343: if (stat(socket_path, &sb) != 0)
344: return;
1.159 semarie 345: mode = sb.st_mode & ACCESSPERMS;
1.93 nicm 346: if (n != 0) {
347: if (mode & S_IRUSR)
348: mode |= S_IXUSR;
349: if (mode & S_IRGRP)
350: mode |= S_IXGRP;
351: if (mode & S_IROTH)
352: mode |= S_IXOTH;
353: } else
354: mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
355: chmod(socket_path, mode);
1.66 nicm 356: }
357: }
358:
359: /* Callback for server socket. */
1.160 nicm 360: static void
1.150 nicm 361: server_accept(int fd, short events, __unused void *data)
1.66 nicm 362: {
1.201 nicm 363: struct sockaddr_storage sa;
364: socklen_t slen = sizeof sa;
365: int newfd;
366: struct client *c;
1.66 nicm 367:
1.104 nicm 368: server_add_accept(0);
1.66 nicm 369: if (!(events & EV_READ))
370: return;
371:
372: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
373: if (newfd == -1) {
374: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
375: return;
1.104 nicm 376: if (errno == ENFILE || errno == EMFILE) {
377: /* Delete and don't try again for 1 second. */
378: server_add_accept(1);
379: return;
380: }
1.66 nicm 381: fatal("accept failed");
382: }
1.201 nicm 383:
1.141 nicm 384: if (server_exit) {
1.66 nicm 385: close(newfd);
386: return;
1.42 nicm 387: }
1.201 nicm 388: c = server_client_create(newfd);
389: if (!server_acl_join(c)) {
390: c->exit_message = xstrdup("access not allowed");
391: c->flags |= CLIENT_EXIT;
392: }
1.66 nicm 393: }
394:
1.104 nicm 395: /*
396: * Add accept event. If timeout is nonzero, add as a timeout instead of a read
397: * event - used to backoff when running out of file descriptors.
398: */
399: void
400: server_add_accept(int timeout)
401: {
402: struct timeval tv = { timeout, 0 };
1.186 nicm 403:
404: if (server_fd == -1)
405: return;
1.104 nicm 406:
407: if (event_initialized(&server_ev_accept))
408: event_del(&server_ev_accept);
409:
410: if (timeout == 0) {
1.144 nicm 411: event_set(&server_ev_accept, server_fd, EV_READ, server_accept,
412: NULL);
1.104 nicm 413: event_add(&server_ev_accept, NULL);
414: } else {
1.144 nicm 415: event_set(&server_ev_accept, server_fd, EV_TIMEOUT,
416: server_accept, NULL);
1.104 nicm 417: event_add(&server_ev_accept, &tv);
418: }
419: }
420:
1.66 nicm 421: /* Signal handler. */
1.160 nicm 422: static void
1.144 nicm 423: server_signal(int sig)
1.66 nicm 424: {
1.119 nicm 425: int fd;
1.120 nicm 426:
1.173 nicm 427: log_debug("%s: %s", __func__, strsignal(sig));
1.66 nicm 428: switch (sig) {
1.191 nicm 429: case SIGINT:
1.66 nicm 430: case SIGTERM:
1.141 nicm 431: server_exit = 1;
432: server_send_exit();
1.66 nicm 433: break;
434: case SIGCHLD:
435: server_child_signal();
436: break;
437: case SIGUSR1:
438: event_del(&server_ev_accept);
1.188 nicm 439: fd = server_create_socket(server_client_flags, NULL);
1.119 nicm 440: if (fd != -1) {
441: close(server_fd);
442: server_fd = fd;
443: server_update_socket();
444: }
1.104 nicm 445: server_add_accept(0);
1.171 nicm 446: break;
447: case SIGUSR2:
448: proc_toggle_log(server_proc);
1.66 nicm 449: break;
1.1 nicm 450: }
451: }
452:
453: /* Handle SIGCHLD. */
1.160 nicm 454: static void
1.1 nicm 455: server_child_signal(void)
456: {
1.66 nicm 457: int status;
458: pid_t pid;
1.1 nicm 459:
460: for (;;) {
461: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
462: case -1:
463: if (errno == ECHILD)
464: return;
1.39 nicm 465: fatal("waitpid failed");
1.1 nicm 466: case 0:
467: return;
468: }
1.66 nicm 469: if (WIFSTOPPED(status))
470: server_child_stopped(pid, status);
1.79 nicm 471: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 472: server_child_exited(pid, status);
473: }
474: }
475:
476: /* Handle exited children. */
1.160 nicm 477: static void
1.66 nicm 478: server_child_exited(pid_t pid, int status)
479: {
1.121 nicm 480: struct window *w, *w1;
1.66 nicm 481: struct window_pane *wp;
482:
1.121 nicm 483: RB_FOREACH_SAFE(w, windows, &windows, w1) {
1.66 nicm 484: TAILQ_FOREACH(wp, &w->panes, entry) {
485: if (wp->pid == pid) {
1.118 nicm 486: wp->status = status;
1.177 nicm 487: wp->flags |= PANE_STATUSREADY;
1.172 nicm 488:
489: log_debug("%%%u exited", wp->id);
490: wp->flags |= PANE_EXITED;
491:
492: if (window_pane_destroy_ready(wp))
493: server_destroy_pane(wp, 1);
1.77 nicm 494: break;
1.53 nicm 495: }
496: }
1.80 nicm 497: }
1.183 nicm 498: job_check_died(pid, status);
1.53 nicm 499: }
500:
1.66 nicm 501: /* Handle stopped children. */
1.160 nicm 502: static void
1.66 nicm 503: server_child_stopped(pid_t pid, int status)
1.31 nicm 504: {
1.66 nicm 505: struct window *w;
506: struct window_pane *wp;
1.31 nicm 507:
1.66 nicm 508: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
509: return;
1.31 nicm 510:
1.121 nicm 511: RB_FOREACH(w, windows, &windows) {
1.66 nicm 512: TAILQ_FOREACH(wp, &w->panes, entry) {
513: if (wp->pid == pid) {
514: if (killpg(pid, SIGCONT) != 0)
515: kill(pid, SIGCONT);
516: }
1.1 nicm 517: }
518: }
1.189 nicm 519: job_check_died(pid, status);
1.190 nicm 520: }
521:
522: /* Add to message log. */
523: void
524: server_add_message(const char *fmt, ...)
525: {
526: struct message_entry *msg, *msg1;
527: char *s;
528: va_list ap;
529: u_int limit;
530:
531: va_start(ap, fmt);
532: xvasprintf(&s, fmt, ap);
533: va_end(ap);
534:
535: log_debug("message: %s", s);
536:
537: msg = xcalloc(1, sizeof *msg);
538: gettimeofday(&msg->msg_time, NULL);
539: msg->msg_num = message_next++;
540: msg->msg = s;
541: TAILQ_INSERT_TAIL(&message_log, msg, entry);
542:
543: limit = options_get_number(global_options, "message-limit");
544: TAILQ_FOREACH_SAFE(msg, &message_log, entry, msg1) {
545: if (msg->msg_num + limit >= message_next)
546: break;
547: free(msg->msg);
548: TAILQ_REMOVE(&message_log, msg, entry);
549: free(msg);
550: }
1.1 nicm 551: }
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