Annotation of src/usr.bin/tmux/server.c, Revision 1.185
1.185 ! nicm 1: /* $OpenBSD: server.c,v 1.184 2019/04/17 14:37:48 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;
1.160 nicm 47: static int server_fd;
48: static int server_exit;
49: static struct event server_ev_accept;
1.155 nicm 50:
51: struct cmd_find_state marked_pane;
1.126 nicm 52:
1.160 nicm 53: static int server_loop(void);
54: static void server_send_exit(void);
55: static void server_accept(int, short, void *);
56: static void server_signal(int);
57: static void server_child_signal(void);
58: static void server_child_exited(pid_t, int);
59: static void server_child_stopped(pid_t, int);
1.126 nicm 60:
61: /* Set marked pane. */
62: void
63: server_set_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
64: {
1.169 nicm 65: cmd_find_clear_state(&marked_pane, 0);
1.155 nicm 66: marked_pane.s = s;
67: marked_pane.wl = wl;
68: marked_pane.w = wl->window;
69: marked_pane.wp = wp;
1.126 nicm 70: }
71:
72: /* Clear marked pane. */
73: void
74: server_clear_marked(void)
75: {
1.169 nicm 76: cmd_find_clear_state(&marked_pane, 0);
1.126 nicm 77: }
78:
79: /* Is this the marked pane? */
80: int
81: server_is_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
82: {
83: if (s == NULL || wl == NULL || wp == NULL)
84: return (0);
1.155 nicm 85: if (marked_pane.s != s || marked_pane.wl != wl)
1.126 nicm 86: return (0);
1.155 nicm 87: if (marked_pane.wp != wp)
1.126 nicm 88: return (0);
89: return (server_check_marked());
90: }
91:
92: /* Check if the marked pane is still valid. */
93: int
94: server_check_marked(void)
95: {
1.155 nicm 96: return (cmd_find_valid_state(&marked_pane));
1.126 nicm 97: }
1.45 nicm 98:
1.60 nicm 99: /* Create server socket. */
1.160 nicm 100: static int
1.178 nicm 101: server_create_socket(char **cause)
1.1 nicm 102: {
1.60 nicm 103: struct sockaddr_un sa;
104: size_t size;
105: mode_t mask;
1.178 nicm 106: int fd, saved_errno;
1.60 nicm 107:
108: memset(&sa, 0, sizeof sa);
109: sa.sun_family = AF_UNIX;
110: size = strlcpy(sa.sun_path, socket_path, sizeof sa.sun_path);
111: if (size >= sizeof sa.sun_path) {
112: errno = ENAMETOOLONG;
1.178 nicm 113: goto fail;
1.60 nicm 114: }
115: unlink(sa.sun_path);
116:
117: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.178 nicm 118: goto fail;
1.60 nicm 119:
1.89 nicm 120: mask = umask(S_IXUSR|S_IXGRP|S_IRWXO);
1.178 nicm 121: if (bind(fd, (struct sockaddr *)&sa, sizeof sa) == -1) {
122: saved_errno = errno;
1.170 nicm 123: close(fd);
1.178 nicm 124: errno = saved_errno;
125: goto fail;
1.170 nicm 126: }
1.60 nicm 127: umask(mask);
128:
1.170 nicm 129: if (listen(fd, 128) == -1) {
1.178 nicm 130: saved_errno = errno;
1.170 nicm 131: close(fd);
1.178 nicm 132: errno = saved_errno;
133: goto fail;
1.170 nicm 134: }
1.100 nicm 135: setblocking(fd, 0);
1.1 nicm 136:
1.60 nicm 137: return (fd);
1.178 nicm 138:
139: fail:
140: if (cause != NULL) {
141: xasprintf(cause, "error creating %s (%s)", socket_path,
142: strerror(errno));
143: }
144: return (-1);
145: }
146:
1.1 nicm 147: /* Fork new server. */
148: int
1.174 nicm 149: server_start(struct tmuxproc *client, struct event_base *base, int lockfd,
150: char *lockfile)
1.1 nicm 151: {
1.167 nicm 152: int pair[2];
1.175 nicm 153: sigset_t set, oldset;
1.178 nicm 154: struct client *c;
155: char *cause = NULL;
1.1 nicm 156:
157: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
158: fatal("socketpair failed");
159:
1.175 nicm 160: sigfillset(&set);
161: sigprocmask(SIG_BLOCK, &set, &oldset);
1.174 nicm 162: switch (fork()) {
163: case -1:
164: fatal("fork failed");
165: case 0:
166: break;
167: default:
1.175 nicm 168: sigprocmask(SIG_SETMASK, &oldset, NULL);
1.1 nicm 169: close(pair[1]);
170: return (pair[0]);
171: }
172: close(pair[0]);
1.174 nicm 173: if (daemon(1, 0) != 0)
174: fatal("daemon failed");
1.176 nicm 175: proc_clear_signals(client, 0);
1.174 nicm 176: if (event_reinit(base) != 0)
177: fatalx("event_reinit failed");
178: server_proc = proc_start("server");
179: proc_set_signals(server_proc, server_signal);
1.175 nicm 180: sigprocmask(SIG_SETMASK, &oldset, NULL);
1.143 nicm 181:
1.171 nicm 182: if (log_get_level() > 1)
1.146 nicm 183: tty_create_log();
1.151 nicm 184: if (pledge("stdio rpath wpath cpath fattr unix getpw recvfd proc exec "
185: "tty ps", NULL) != 0)
1.143 nicm 186: fatal("pledge failed");
1.1 nicm 187:
1.121 nicm 188: RB_INIT(&windows);
1.102 nicm 189: RB_INIT(&all_window_panes);
1.122 nicm 190: TAILQ_INIT(&clients);
1.97 nicm 191: RB_INIT(&sessions);
1.1 nicm 192: key_bindings_init();
193:
1.153 nicm 194: gettimeofday(&start_time, NULL);
1.16 nicm 195:
1.178 nicm 196: server_fd = server_create_socket(&cause);
197: if (server_fd != -1)
198: server_update_socket();
199: c = server_client_create(pair[1]);
1.103 nicm 200:
1.154 nicm 201: if (lockfd >= 0) {
202: unlink(lockfile);
203: free(lockfile);
204: close(lockfd);
205: }
1.16 nicm 206:
1.178 nicm 207: if (cause != NULL) {
1.185 ! nicm 208: cmdq_append(c, cmdq_get_error(cause));
! 209: free(cause);
1.178 nicm 210: c->flags |= CLIENT_EXIT;
211: }
212:
1.139 nicm 213: start_cfg();
1.104 nicm 214: server_add_accept(0);
1.66 nicm 215:
1.144 nicm 216: proc_loop(server_proc, server_loop);
1.167 nicm 217:
1.183 nicm 218: job_kill_all();
219: status_prompt_save_history();
1.167 nicm 220:
1.66 nicm 221: exit(0);
1.1 nicm 222: }
223:
1.144 nicm 224: /* Server loop callback. */
1.160 nicm 225: static int
1.66 nicm 226: server_loop(void)
1.1 nicm 227: {
1.144 nicm 228: struct client *c;
1.162 nicm 229: u_int items;
230:
231: do {
232: items = cmdq_next(NULL);
1.164 nicm 233: TAILQ_FOREACH(c, &clients, entry) {
234: if (c->flags & CLIENT_IDENTIFIED)
235: items += cmdq_next(c);
236: }
1.162 nicm 237: } while (items != 0);
1.31 nicm 238:
1.144 nicm 239: server_client_loop();
1.179 nicm 240:
241: if (!options_get_number(global_options, "exit-empty") && !server_exit)
242: return (0);
1.1 nicm 243:
1.145 nicm 244: if (!options_get_number(global_options, "exit-unattached")) {
1.97 nicm 245: if (!RB_EMPTY(&sessions))
246: return (0);
1.1 nicm 247: }
1.116 nicm 248:
1.122 nicm 249: TAILQ_FOREACH(c, &clients, entry) {
250: if (c->session != NULL)
1.116 nicm 251: return (0);
252: }
253:
254: /*
255: * No attached clients therefore want to exit - flush any waiting
256: * clients but don't actually exit until they've gone.
257: */
258: cmd_wait_for_flush();
1.122 nicm 259: if (!TAILQ_EMPTY(&clients))
260: return (0);
1.116 nicm 261:
1.183 nicm 262: if (job_still_running())
263: return (0);
1.180 nicm 264:
1.66 nicm 265: return (1);
1.1 nicm 266: }
267:
1.141 nicm 268: /* Exit the server by killing all clients and windows. */
1.160 nicm 269: static void
1.141 nicm 270: server_send_exit(void)
1.1 nicm 271: {
1.122 nicm 272: struct client *c, *c1;
273: struct session *s, *s1;
1.116 nicm 274:
275: cmd_wait_for_flush();
1.1 nicm 276:
1.122 nicm 277: TAILQ_FOREACH_SAFE(c, &clients, entry, c1) {
1.144 nicm 278: if (c->flags & CLIENT_SUSPENDED)
1.122 nicm 279: server_client_lost(c);
1.180 nicm 280: else {
281: if (c->flags & CLIENT_ATTACHED)
282: notify_client("client-detached", c);
1.144 nicm 283: proc_send(c->peer, MSG_SHUTDOWN, -1, NULL, 0);
1.180 nicm 284: }
1.122 nicm 285: c->session = NULL;
1.42 nicm 286: }
287:
1.122 nicm 288: RB_FOREACH_SAFE(s, sessions, &sessions, s1)
1.184 nicm 289: session_destroy(s, 1, __func__);
1.66 nicm 290: }
291:
292: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 293: void
1.66 nicm 294: server_update_socket(void)
1.42 nicm 295: {
1.66 nicm 296: struct session *s;
297: static int last = -1;
1.93 nicm 298: int n, mode;
299: struct stat sb;
1.1 nicm 300:
1.66 nicm 301: n = 0;
1.97 nicm 302: RB_FOREACH(s, sessions, &sessions) {
1.182 nicm 303: if (s->attached != 0) {
1.66 nicm 304: n++;
305: break;
306: }
307: }
308:
309: if (n != last) {
310: last = n;
1.93 nicm 311:
312: if (stat(socket_path, &sb) != 0)
313: return;
1.159 semarie 314: mode = sb.st_mode & ACCESSPERMS;
1.93 nicm 315: if (n != 0) {
316: if (mode & S_IRUSR)
317: mode |= S_IXUSR;
318: if (mode & S_IRGRP)
319: mode |= S_IXGRP;
320: if (mode & S_IROTH)
321: mode |= S_IXOTH;
322: } else
323: mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
324: chmod(socket_path, mode);
1.66 nicm 325: }
326: }
327:
328: /* Callback for server socket. */
1.160 nicm 329: static void
1.150 nicm 330: server_accept(int fd, short events, __unused void *data)
1.66 nicm 331: {
332: struct sockaddr_storage sa;
333: socklen_t slen = sizeof sa;
334: int newfd;
335:
1.104 nicm 336: server_add_accept(0);
1.66 nicm 337: if (!(events & EV_READ))
338: return;
339:
340: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
341: if (newfd == -1) {
342: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
343: return;
1.104 nicm 344: if (errno == ENFILE || errno == EMFILE) {
345: /* Delete and don't try again for 1 second. */
346: server_add_accept(1);
347: return;
348: }
1.66 nicm 349: fatal("accept failed");
350: }
1.141 nicm 351: if (server_exit) {
1.66 nicm 352: close(newfd);
353: return;
1.42 nicm 354: }
1.66 nicm 355: server_client_create(newfd);
356: }
357:
1.104 nicm 358: /*
359: * Add accept event. If timeout is nonzero, add as a timeout instead of a read
360: * event - used to backoff when running out of file descriptors.
361: */
362: void
363: server_add_accept(int timeout)
364: {
365: struct timeval tv = { timeout, 0 };
366:
367: if (event_initialized(&server_ev_accept))
368: event_del(&server_ev_accept);
369:
370: if (timeout == 0) {
1.144 nicm 371: event_set(&server_ev_accept, server_fd, EV_READ, server_accept,
372: NULL);
1.104 nicm 373: event_add(&server_ev_accept, NULL);
374: } else {
1.144 nicm 375: event_set(&server_ev_accept, server_fd, EV_TIMEOUT,
376: server_accept, NULL);
1.104 nicm 377: event_add(&server_ev_accept, &tv);
378: }
379: }
380:
1.66 nicm 381: /* Signal handler. */
1.160 nicm 382: static void
1.144 nicm 383: server_signal(int sig)
1.66 nicm 384: {
1.119 nicm 385: int fd;
1.120 nicm 386:
1.173 nicm 387: log_debug("%s: %s", __func__, strsignal(sig));
1.66 nicm 388: switch (sig) {
389: case SIGTERM:
1.141 nicm 390: server_exit = 1;
391: server_send_exit();
1.66 nicm 392: break;
393: case SIGCHLD:
394: server_child_signal();
395: break;
396: case SIGUSR1:
397: event_del(&server_ev_accept);
1.178 nicm 398: fd = server_create_socket(NULL);
1.119 nicm 399: if (fd != -1) {
400: close(server_fd);
401: server_fd = fd;
402: server_update_socket();
403: }
1.104 nicm 404: server_add_accept(0);
1.171 nicm 405: break;
406: case SIGUSR2:
407: proc_toggle_log(server_proc);
1.66 nicm 408: break;
1.1 nicm 409: }
410: }
411:
412: /* Handle SIGCHLD. */
1.160 nicm 413: static void
1.1 nicm 414: server_child_signal(void)
415: {
1.66 nicm 416: int status;
417: pid_t pid;
1.1 nicm 418:
419: for (;;) {
420: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
421: case -1:
422: if (errno == ECHILD)
423: return;
1.39 nicm 424: fatal("waitpid failed");
1.1 nicm 425: case 0:
426: return;
427: }
1.66 nicm 428: if (WIFSTOPPED(status))
429: server_child_stopped(pid, status);
1.79 nicm 430: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 431: server_child_exited(pid, status);
432: }
433: }
434:
435: /* Handle exited children. */
1.160 nicm 436: static void
1.66 nicm 437: server_child_exited(pid_t pid, int status)
438: {
1.121 nicm 439: struct window *w, *w1;
1.66 nicm 440: struct window_pane *wp;
441:
1.121 nicm 442: RB_FOREACH_SAFE(w, windows, &windows, w1) {
1.66 nicm 443: TAILQ_FOREACH(wp, &w->panes, entry) {
444: if (wp->pid == pid) {
1.118 nicm 445: wp->status = status;
1.177 nicm 446: wp->flags |= PANE_STATUSREADY;
1.172 nicm 447:
448: log_debug("%%%u exited", wp->id);
449: wp->flags |= PANE_EXITED;
450:
451: if (window_pane_destroy_ready(wp))
452: server_destroy_pane(wp, 1);
1.77 nicm 453: break;
1.53 nicm 454: }
455: }
1.80 nicm 456: }
1.183 nicm 457: job_check_died(pid, status);
1.53 nicm 458: }
459:
1.66 nicm 460: /* Handle stopped children. */
1.160 nicm 461: static void
1.66 nicm 462: server_child_stopped(pid_t pid, int status)
1.31 nicm 463: {
1.66 nicm 464: struct window *w;
465: struct window_pane *wp;
1.31 nicm 466:
1.66 nicm 467: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
468: return;
1.31 nicm 469:
1.121 nicm 470: RB_FOREACH(w, windows, &windows) {
1.66 nicm 471: TAILQ_FOREACH(wp, &w->panes, entry) {
472: if (wp->pid == pid) {
473: if (killpg(pid, SIGCONT) != 0)
474: kill(pid, SIGCONT);
475: }
1.1 nicm 476: }
477: }
478: }