Annotation of src/usr.bin/tmux/server.c, Revision 1.196
1.196 ! nicm 1: /* $OpenBSD: server.c,v 1.195 2020/09/16 18:37:55 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;
1.155 nicm 51:
52: struct cmd_find_state marked_pane;
1.126 nicm 53:
1.190 nicm 54: static u_int message_next;
55: struct message_list message_log;
56:
1.160 nicm 57: static int server_loop(void);
58: static void server_send_exit(void);
59: static void server_accept(int, short, void *);
60: static void server_signal(int);
61: static void server_child_signal(void);
62: static void server_child_exited(pid_t, int);
63: static void server_child_stopped(pid_t, int);
1.126 nicm 64:
65: /* Set marked pane. */
66: void
67: server_set_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
68: {
1.169 nicm 69: cmd_find_clear_state(&marked_pane, 0);
1.155 nicm 70: marked_pane.s = s;
71: marked_pane.wl = wl;
72: marked_pane.w = wl->window;
73: marked_pane.wp = wp;
1.126 nicm 74: }
75:
76: /* Clear marked pane. */
77: void
78: server_clear_marked(void)
79: {
1.169 nicm 80: cmd_find_clear_state(&marked_pane, 0);
1.126 nicm 81: }
82:
83: /* Is this the marked pane? */
84: int
85: server_is_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
86: {
87: if (s == NULL || wl == NULL || wp == NULL)
88: return (0);
1.155 nicm 89: if (marked_pane.s != s || marked_pane.wl != wl)
1.126 nicm 90: return (0);
1.155 nicm 91: if (marked_pane.wp != wp)
1.126 nicm 92: return (0);
93: return (server_check_marked());
94: }
95:
96: /* Check if the marked pane is still valid. */
97: int
98: server_check_marked(void)
99: {
1.155 nicm 100: return (cmd_find_valid_state(&marked_pane));
1.126 nicm 101: }
1.45 nicm 102:
1.60 nicm 103: /* Create server socket. */
1.160 nicm 104: static int
1.188 nicm 105: server_create_socket(int flags, char **cause)
1.1 nicm 106: {
1.60 nicm 107: struct sockaddr_un sa;
108: size_t size;
109: mode_t mask;
1.178 nicm 110: int fd, saved_errno;
1.60 nicm 111:
112: memset(&sa, 0, sizeof sa);
113: sa.sun_family = AF_UNIX;
114: size = strlcpy(sa.sun_path, socket_path, sizeof sa.sun_path);
115: if (size >= sizeof sa.sun_path) {
116: errno = ENAMETOOLONG;
1.178 nicm 117: goto fail;
1.60 nicm 118: }
119: unlink(sa.sun_path);
120:
121: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.178 nicm 122: goto fail;
1.60 nicm 123:
1.188 nicm 124: if (flags & CLIENT_DEFAULTSOCKET)
125: mask = umask(S_IXUSR|S_IXGRP|S_IRWXO);
126: else
127: mask = umask(S_IXUSR|S_IRWXG|S_IRWXO);
1.178 nicm 128: if (bind(fd, (struct sockaddr *)&sa, sizeof sa) == -1) {
129: saved_errno = errno;
1.170 nicm 130: close(fd);
1.178 nicm 131: errno = saved_errno;
132: goto fail;
1.170 nicm 133: }
1.60 nicm 134: umask(mask);
135:
1.170 nicm 136: if (listen(fd, 128) == -1) {
1.178 nicm 137: saved_errno = errno;
1.170 nicm 138: close(fd);
1.178 nicm 139: errno = saved_errno;
140: goto fail;
1.170 nicm 141: }
1.100 nicm 142: setblocking(fd, 0);
1.1 nicm 143:
1.60 nicm 144: return (fd);
1.178 nicm 145:
146: fail:
147: if (cause != NULL) {
148: xasprintf(cause, "error creating %s (%s)", socket_path,
149: strerror(errno));
150: }
151: return (-1);
152: }
153:
1.1 nicm 154: /* Fork new server. */
155: int
1.188 nicm 156: server_start(struct tmuxproc *client, int flags, struct event_base *base,
157: int lockfd, char *lockfile)
1.1 nicm 158: {
1.196 ! nicm 159: int fd;
! 160: sigset_t set, oldset;
! 161: struct client *c = NULL;
! 162: char *cause = NULL;
1.1 nicm 163:
1.175 nicm 164: sigfillset(&set);
165: sigprocmask(SIG_BLOCK, &set, &oldset);
1.191 nicm 166:
167: if (~flags & CLIENT_NOFORK) {
1.196 ! nicm 168: if (proc_fork_and_daemon(&fd) != 0) {
1.191 nicm 169: sigprocmask(SIG_SETMASK, &oldset, NULL);
1.196 ! nicm 170: return (fd);
1.191 nicm 171: }
172: }
1.196 ! nicm 173: proc_clear_signals(client, 0);
1.191 nicm 174: server_client_flags = flags;
175:
1.174 nicm 176: if (event_reinit(base) != 0)
177: fatalx("event_reinit failed");
178: server_proc = proc_start("server");
1.191 nicm 179:
1.174 nicm 180: proc_set_signals(server_proc, server_signal);
1.175 nicm 181: sigprocmask(SIG_SETMASK, &oldset, NULL);
1.143 nicm 182:
1.171 nicm 183: if (log_get_level() > 1)
1.146 nicm 184: tty_create_log();
1.151 nicm 185: if (pledge("stdio rpath wpath cpath fattr unix getpw recvfd proc exec "
186: "tty ps", NULL) != 0)
1.143 nicm 187: fatal("pledge failed");
1.1 nicm 188:
1.192 nicm 189: input_key_build();
1.121 nicm 190: RB_INIT(&windows);
1.102 nicm 191: RB_INIT(&all_window_panes);
1.122 nicm 192: TAILQ_INIT(&clients);
1.97 nicm 193: RB_INIT(&sessions);
1.1 nicm 194: key_bindings_init();
1.190 nicm 195: TAILQ_INIT(&message_log);
1.1 nicm 196:
1.153 nicm 197: gettimeofday(&start_time, NULL);
1.16 nicm 198:
1.188 nicm 199: server_fd = server_create_socket(flags, &cause);
1.178 nicm 200: if (server_fd != -1)
201: server_update_socket();
1.191 nicm 202: if (~flags & CLIENT_NOFORK)
1.196 ! nicm 203: c = server_client_create(fd);
1.191 nicm 204: else
205: options_set_number(global_options, "exit-empty", 0);
1.103 nicm 206:
1.154 nicm 207: if (lockfd >= 0) {
208: unlink(lockfile);
209: free(lockfile);
210: close(lockfd);
211: }
1.16 nicm 212:
1.178 nicm 213: if (cause != NULL) {
1.195 nicm 214: if (c != NULL) {
215: cmdq_append(c, cmdq_get_error(cause));
216: c->flags |= CLIENT_EXIT;
217: }
1.185 nicm 218: free(cause);
1.187 nicm 219: }
1.178 nicm 220:
1.104 nicm 221: server_add_accept(0);
1.144 nicm 222: proc_loop(server_proc, server_loop);
1.167 nicm 223:
1.183 nicm 224: job_kill_all();
225: status_prompt_save_history();
1.167 nicm 226:
1.66 nicm 227: exit(0);
1.1 nicm 228: }
229:
1.144 nicm 230: /* Server loop callback. */
1.160 nicm 231: static int
1.66 nicm 232: server_loop(void)
1.1 nicm 233: {
1.144 nicm 234: struct client *c;
1.162 nicm 235: u_int items;
236:
237: do {
238: items = cmdq_next(NULL);
1.164 nicm 239: TAILQ_FOREACH(c, &clients, entry) {
240: if (c->flags & CLIENT_IDENTIFIED)
241: items += cmdq_next(c);
242: }
1.162 nicm 243: } while (items != 0);
1.31 nicm 244:
1.144 nicm 245: server_client_loop();
1.179 nicm 246:
247: if (!options_get_number(global_options, "exit-empty") && !server_exit)
248: return (0);
1.1 nicm 249:
1.145 nicm 250: if (!options_get_number(global_options, "exit-unattached")) {
1.97 nicm 251: if (!RB_EMPTY(&sessions))
252: return (0);
1.1 nicm 253: }
1.116 nicm 254:
1.122 nicm 255: TAILQ_FOREACH(c, &clients, entry) {
256: if (c->session != NULL)
1.116 nicm 257: return (0);
258: }
259:
260: /*
261: * No attached clients therefore want to exit - flush any waiting
262: * clients but don't actually exit until they've gone.
263: */
264: cmd_wait_for_flush();
1.122 nicm 265: if (!TAILQ_EMPTY(&clients))
266: return (0);
1.116 nicm 267:
1.183 nicm 268: if (job_still_running())
269: return (0);
1.180 nicm 270:
1.66 nicm 271: return (1);
1.1 nicm 272: }
273:
1.141 nicm 274: /* Exit the server by killing all clients and windows. */
1.160 nicm 275: static void
1.141 nicm 276: server_send_exit(void)
1.1 nicm 277: {
1.122 nicm 278: struct client *c, *c1;
279: struct session *s, *s1;
1.116 nicm 280:
281: cmd_wait_for_flush();
1.1 nicm 282:
1.122 nicm 283: TAILQ_FOREACH_SAFE(c, &clients, entry, c1) {
1.144 nicm 284: if (c->flags & CLIENT_SUSPENDED)
1.122 nicm 285: server_client_lost(c);
1.180 nicm 286: else {
1.193 nicm 287: c->flags |= CLIENT_EXIT;
288: c->exit_type = CLIENT_EXIT_SHUTDOWN;
1.180 nicm 289: }
1.122 nicm 290: c->session = NULL;
1.42 nicm 291: }
292:
1.122 nicm 293: RB_FOREACH_SAFE(s, sessions, &sessions, s1)
1.184 nicm 294: session_destroy(s, 1, __func__);
1.66 nicm 295: }
296:
297: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 298: void
1.66 nicm 299: server_update_socket(void)
1.42 nicm 300: {
1.66 nicm 301: struct session *s;
302: static int last = -1;
1.93 nicm 303: int n, mode;
304: struct stat sb;
1.1 nicm 305:
1.66 nicm 306: n = 0;
1.97 nicm 307: RB_FOREACH(s, sessions, &sessions) {
1.182 nicm 308: if (s->attached != 0) {
1.66 nicm 309: n++;
310: break;
311: }
312: }
313:
314: if (n != last) {
315: last = n;
1.93 nicm 316:
317: if (stat(socket_path, &sb) != 0)
318: return;
1.159 semarie 319: mode = sb.st_mode & ACCESSPERMS;
1.93 nicm 320: if (n != 0) {
321: if (mode & S_IRUSR)
322: mode |= S_IXUSR;
323: if (mode & S_IRGRP)
324: mode |= S_IXGRP;
325: if (mode & S_IROTH)
326: mode |= S_IXOTH;
327: } else
328: mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
329: chmod(socket_path, mode);
1.66 nicm 330: }
331: }
332:
333: /* Callback for server socket. */
1.160 nicm 334: static void
1.150 nicm 335: server_accept(int fd, short events, __unused void *data)
1.66 nicm 336: {
337: struct sockaddr_storage sa;
338: socklen_t slen = sizeof sa;
339: int newfd;
340:
1.104 nicm 341: server_add_accept(0);
1.66 nicm 342: if (!(events & EV_READ))
343: return;
344:
345: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
346: if (newfd == -1) {
347: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
348: return;
1.104 nicm 349: if (errno == ENFILE || errno == EMFILE) {
350: /* Delete and don't try again for 1 second. */
351: server_add_accept(1);
352: return;
353: }
1.66 nicm 354: fatal("accept failed");
355: }
1.141 nicm 356: if (server_exit) {
1.66 nicm 357: close(newfd);
358: return;
1.42 nicm 359: }
1.66 nicm 360: server_client_create(newfd);
361: }
362:
1.104 nicm 363: /*
364: * Add accept event. If timeout is nonzero, add as a timeout instead of a read
365: * event - used to backoff when running out of file descriptors.
366: */
367: void
368: server_add_accept(int timeout)
369: {
370: struct timeval tv = { timeout, 0 };
1.186 nicm 371:
372: if (server_fd == -1)
373: return;
1.104 nicm 374:
375: if (event_initialized(&server_ev_accept))
376: event_del(&server_ev_accept);
377:
378: if (timeout == 0) {
1.144 nicm 379: event_set(&server_ev_accept, server_fd, EV_READ, server_accept,
380: NULL);
1.104 nicm 381: event_add(&server_ev_accept, NULL);
382: } else {
1.144 nicm 383: event_set(&server_ev_accept, server_fd, EV_TIMEOUT,
384: server_accept, NULL);
1.104 nicm 385: event_add(&server_ev_accept, &tv);
386: }
387: }
388:
1.66 nicm 389: /* Signal handler. */
1.160 nicm 390: static void
1.144 nicm 391: server_signal(int sig)
1.66 nicm 392: {
1.119 nicm 393: int fd;
1.120 nicm 394:
1.173 nicm 395: log_debug("%s: %s", __func__, strsignal(sig));
1.66 nicm 396: switch (sig) {
1.191 nicm 397: case SIGINT:
1.66 nicm 398: case SIGTERM:
1.141 nicm 399: server_exit = 1;
400: server_send_exit();
1.66 nicm 401: break;
402: case SIGCHLD:
403: server_child_signal();
404: break;
405: case SIGUSR1:
406: event_del(&server_ev_accept);
1.188 nicm 407: fd = server_create_socket(server_client_flags, NULL);
1.119 nicm 408: if (fd != -1) {
409: close(server_fd);
410: server_fd = fd;
411: server_update_socket();
412: }
1.104 nicm 413: server_add_accept(0);
1.171 nicm 414: break;
415: case SIGUSR2:
416: proc_toggle_log(server_proc);
1.66 nicm 417: break;
1.1 nicm 418: }
419: }
420:
421: /* Handle SIGCHLD. */
1.160 nicm 422: static void
1.1 nicm 423: server_child_signal(void)
424: {
1.66 nicm 425: int status;
426: pid_t pid;
1.1 nicm 427:
428: for (;;) {
429: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
430: case -1:
431: if (errno == ECHILD)
432: return;
1.39 nicm 433: fatal("waitpid failed");
1.1 nicm 434: case 0:
435: return;
436: }
1.66 nicm 437: if (WIFSTOPPED(status))
438: server_child_stopped(pid, status);
1.79 nicm 439: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 440: server_child_exited(pid, status);
441: }
442: }
443:
444: /* Handle exited children. */
1.160 nicm 445: static void
1.66 nicm 446: server_child_exited(pid_t pid, int status)
447: {
1.121 nicm 448: struct window *w, *w1;
1.66 nicm 449: struct window_pane *wp;
450:
1.121 nicm 451: RB_FOREACH_SAFE(w, windows, &windows, w1) {
1.66 nicm 452: TAILQ_FOREACH(wp, &w->panes, entry) {
453: if (wp->pid == pid) {
1.118 nicm 454: wp->status = status;
1.177 nicm 455: wp->flags |= PANE_STATUSREADY;
1.172 nicm 456:
457: log_debug("%%%u exited", wp->id);
458: wp->flags |= PANE_EXITED;
459:
460: if (window_pane_destroy_ready(wp))
461: server_destroy_pane(wp, 1);
1.77 nicm 462: break;
1.53 nicm 463: }
464: }
1.80 nicm 465: }
1.183 nicm 466: job_check_died(pid, status);
1.53 nicm 467: }
468:
1.66 nicm 469: /* Handle stopped children. */
1.160 nicm 470: static void
1.66 nicm 471: server_child_stopped(pid_t pid, int status)
1.31 nicm 472: {
1.66 nicm 473: struct window *w;
474: struct window_pane *wp;
1.31 nicm 475:
1.66 nicm 476: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
477: return;
1.31 nicm 478:
1.121 nicm 479: RB_FOREACH(w, windows, &windows) {
1.66 nicm 480: TAILQ_FOREACH(wp, &w->panes, entry) {
481: if (wp->pid == pid) {
482: if (killpg(pid, SIGCONT) != 0)
483: kill(pid, SIGCONT);
484: }
1.1 nicm 485: }
486: }
1.189 nicm 487: job_check_died(pid, status);
1.190 nicm 488: }
489:
490: /* Add to message log. */
491: void
492: server_add_message(const char *fmt, ...)
493: {
494: struct message_entry *msg, *msg1;
495: char *s;
496: va_list ap;
497: u_int limit;
498:
499: va_start(ap, fmt);
500: xvasprintf(&s, fmt, ap);
501: va_end(ap);
502:
503: log_debug("message: %s", s);
504:
505: msg = xcalloc(1, sizeof *msg);
506: gettimeofday(&msg->msg_time, NULL);
507: msg->msg_num = message_next++;
508: msg->msg = s;
509: TAILQ_INSERT_TAIL(&message_log, msg, entry);
510:
511: limit = options_get_number(global_options, "message-limit");
512: TAILQ_FOREACH_SAFE(msg, &message_log, entry, msg1) {
513: if (msg->msg_num + limit >= message_next)
514: break;
515: free(msg->msg);
516: TAILQ_REMOVE(&message_log, msg, entry);
517: free(msg);
518: }
1.1 nicm 519: }
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