Annotation of src/usr.bin/tmux/server.c, Revision 1.178
1.178 ! nicm 1: /* $OpenBSD: server.c,v 1.177 2017/10/12 11:32:27 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:
! 147: /* Server error callback. */
! 148: static enum cmd_retval
! 149: server_start_error(struct cmdq_item *item, void *data)
! 150: {
! 151: char *error = data;
! 152:
! 153: cmdq_error(item, "%s", error);
! 154: free(error);
! 155:
! 156: return (CMD_RETURN_NORMAL);
1.60 nicm 157: }
158:
1.1 nicm 159: /* Fork new server. */
160: int
1.174 nicm 161: server_start(struct tmuxproc *client, struct event_base *base, int lockfd,
162: char *lockfile)
1.1 nicm 163: {
1.167 nicm 164: int pair[2];
165: struct job *job;
1.175 nicm 166: sigset_t set, oldset;
1.178 ! nicm 167: struct client *c;
! 168: char *cause = NULL;
1.1 nicm 169:
170: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
171: fatal("socketpair failed");
172:
1.175 nicm 173: sigfillset(&set);
174: sigprocmask(SIG_BLOCK, &set, &oldset);
1.174 nicm 175: switch (fork()) {
176: case -1:
177: fatal("fork failed");
178: case 0:
179: break;
180: default:
1.175 nicm 181: sigprocmask(SIG_SETMASK, &oldset, NULL);
1.1 nicm 182: close(pair[1]);
183: return (pair[0]);
184: }
185: close(pair[0]);
1.174 nicm 186: if (daemon(1, 0) != 0)
187: fatal("daemon failed");
1.176 nicm 188: proc_clear_signals(client, 0);
1.174 nicm 189: if (event_reinit(base) != 0)
190: fatalx("event_reinit failed");
191: server_proc = proc_start("server");
192: proc_set_signals(server_proc, server_signal);
1.175 nicm 193: sigprocmask(SIG_SETMASK, &oldset, NULL);
1.143 nicm 194:
1.171 nicm 195: if (log_get_level() > 1)
1.146 nicm 196: tty_create_log();
1.151 nicm 197: if (pledge("stdio rpath wpath cpath fattr unix getpw recvfd proc exec "
198: "tty ps", NULL) != 0)
1.143 nicm 199: fatal("pledge failed");
1.1 nicm 200:
1.121 nicm 201: RB_INIT(&windows);
1.102 nicm 202: RB_INIT(&all_window_panes);
1.122 nicm 203: TAILQ_INIT(&clients);
1.97 nicm 204: RB_INIT(&sessions);
1.166 nicm 205: RB_INIT(&session_groups);
1.1 nicm 206: key_bindings_init();
207:
1.153 nicm 208: gettimeofday(&start_time, NULL);
1.16 nicm 209:
1.178 ! nicm 210: server_fd = server_create_socket(&cause);
! 211: if (server_fd != -1)
! 212: server_update_socket();
! 213: c = server_client_create(pair[1]);
1.103 nicm 214:
1.154 nicm 215: if (lockfd >= 0) {
216: unlink(lockfile);
217: free(lockfile);
218: close(lockfd);
219: }
1.16 nicm 220:
1.178 ! nicm 221: if (cause != NULL) {
! 222: cmdq_append(c, cmdq_get_callback(server_start_error, cause));
! 223: c->flags |= CLIENT_EXIT;
! 224: }
! 225:
1.139 nicm 226: start_cfg();
1.66 nicm 227:
1.104 nicm 228: server_add_accept(0);
1.66 nicm 229:
1.144 nicm 230: proc_loop(server_proc, server_loop);
1.167 nicm 231:
232: LIST_FOREACH(job, &all_jobs, entry) {
233: if (job->pid != -1)
234: kill(job->pid, SIGTERM);
235: }
236:
1.129 nicm 237: status_prompt_save_history();
1.66 nicm 238: exit(0);
1.1 nicm 239: }
240:
1.144 nicm 241: /* Server loop callback. */
1.160 nicm 242: static int
1.66 nicm 243: server_loop(void)
1.1 nicm 244: {
1.144 nicm 245: struct client *c;
1.162 nicm 246: u_int items;
247:
248: do {
249: items = cmdq_next(NULL);
1.164 nicm 250: TAILQ_FOREACH(c, &clients, entry) {
251: if (c->flags & CLIENT_IDENTIFIED)
252: items += cmdq_next(c);
253: }
1.162 nicm 254: } while (items != 0);
1.31 nicm 255:
1.144 nicm 256: server_client_loop();
1.1 nicm 257:
1.145 nicm 258: if (!options_get_number(global_options, "exit-unattached")) {
1.97 nicm 259: if (!RB_EMPTY(&sessions))
260: return (0);
1.1 nicm 261: }
1.116 nicm 262:
1.122 nicm 263: TAILQ_FOREACH(c, &clients, entry) {
264: if (c->session != NULL)
1.116 nicm 265: return (0);
266: }
267:
268: /*
269: * No attached clients therefore want to exit - flush any waiting
270: * clients but don't actually exit until they've gone.
271: */
272: cmd_wait_for_flush();
1.122 nicm 273: if (!TAILQ_EMPTY(&clients))
274: return (0);
1.116 nicm 275:
1.66 nicm 276: return (1);
1.1 nicm 277: }
278:
1.141 nicm 279: /* Exit the server by killing all clients and windows. */
1.160 nicm 280: static void
1.141 nicm 281: server_send_exit(void)
1.1 nicm 282: {
1.122 nicm 283: struct client *c, *c1;
284: struct session *s, *s1;
1.116 nicm 285:
286: cmd_wait_for_flush();
1.1 nicm 287:
1.122 nicm 288: TAILQ_FOREACH_SAFE(c, &clients, entry, c1) {
1.144 nicm 289: if (c->flags & CLIENT_SUSPENDED)
1.122 nicm 290: server_client_lost(c);
291: else
1.144 nicm 292: proc_send(c->peer, MSG_SHUTDOWN, -1, NULL, 0);
1.122 nicm 293: c->session = NULL;
1.42 nicm 294: }
295:
1.122 nicm 296: RB_FOREACH_SAFE(s, sessions, &sessions, s1)
1.173 nicm 297: session_destroy(s, __func__);
1.66 nicm 298: }
299:
300: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 301: void
1.66 nicm 302: server_update_socket(void)
1.42 nicm 303: {
1.66 nicm 304: struct session *s;
305: static int last = -1;
1.93 nicm 306: int n, mode;
307: struct stat sb;
1.1 nicm 308:
1.66 nicm 309: n = 0;
1.97 nicm 310: RB_FOREACH(s, sessions, &sessions) {
311: if (!(s->flags & SESSION_UNATTACHED)) {
1.66 nicm 312: n++;
313: break;
314: }
315: }
316:
317: if (n != last) {
318: last = n;
1.93 nicm 319:
320: if (stat(socket_path, &sb) != 0)
321: return;
1.159 semarie 322: mode = sb.st_mode & ACCESSPERMS;
1.93 nicm 323: if (n != 0) {
324: if (mode & S_IRUSR)
325: mode |= S_IXUSR;
326: if (mode & S_IRGRP)
327: mode |= S_IXGRP;
328: if (mode & S_IROTH)
329: mode |= S_IXOTH;
330: } else
331: mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
332: chmod(socket_path, mode);
1.66 nicm 333: }
334: }
335:
336: /* Callback for server socket. */
1.160 nicm 337: static void
1.150 nicm 338: server_accept(int fd, short events, __unused void *data)
1.66 nicm 339: {
340: struct sockaddr_storage sa;
341: socklen_t slen = sizeof sa;
342: int newfd;
343:
1.104 nicm 344: server_add_accept(0);
1.66 nicm 345: if (!(events & EV_READ))
346: return;
347:
348: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
349: if (newfd == -1) {
350: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
351: return;
1.104 nicm 352: if (errno == ENFILE || errno == EMFILE) {
353: /* Delete and don't try again for 1 second. */
354: server_add_accept(1);
355: return;
356: }
1.66 nicm 357: fatal("accept failed");
358: }
1.141 nicm 359: if (server_exit) {
1.66 nicm 360: close(newfd);
361: return;
1.42 nicm 362: }
1.66 nicm 363: server_client_create(newfd);
364: }
365:
1.104 nicm 366: /*
367: * Add accept event. If timeout is nonzero, add as a timeout instead of a read
368: * event - used to backoff when running out of file descriptors.
369: */
370: void
371: server_add_accept(int timeout)
372: {
373: struct timeval tv = { timeout, 0 };
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) {
397: case SIGTERM:
1.141 nicm 398: server_exit = 1;
399: server_send_exit();
1.66 nicm 400: break;
401: case SIGCHLD:
402: server_child_signal();
403: break;
404: case SIGUSR1:
405: event_del(&server_ev_accept);
1.178 ! nicm 406: fd = server_create_socket(NULL);
1.119 nicm 407: if (fd != -1) {
408: close(server_fd);
409: server_fd = fd;
410: server_update_socket();
411: }
1.104 nicm 412: server_add_accept(0);
1.171 nicm 413: break;
414: case SIGUSR2:
415: proc_toggle_log(server_proc);
1.66 nicm 416: break;
1.1 nicm 417: }
418: }
419:
420: /* Handle SIGCHLD. */
1.160 nicm 421: static void
1.1 nicm 422: server_child_signal(void)
423: {
1.66 nicm 424: int status;
425: pid_t pid;
1.1 nicm 426:
427: for (;;) {
428: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
429: case -1:
430: if (errno == ECHILD)
431: return;
1.39 nicm 432: fatal("waitpid failed");
1.1 nicm 433: case 0:
434: return;
435: }
1.66 nicm 436: if (WIFSTOPPED(status))
437: server_child_stopped(pid, status);
1.79 nicm 438: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 439: server_child_exited(pid, status);
440: }
441: }
442:
443: /* Handle exited children. */
1.160 nicm 444: static void
1.66 nicm 445: server_child_exited(pid_t pid, int status)
446: {
1.121 nicm 447: struct window *w, *w1;
1.66 nicm 448: struct window_pane *wp;
449: struct job *job;
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: }
1.1 nicm 466:
1.167 nicm 467: LIST_FOREACH(job, &all_jobs, entry) {
1.66 nicm 468: if (pid == job->pid) {
1.67 nicm 469: job_died(job, status); /* might free job */
470: break;
1.1 nicm 471: }
1.53 nicm 472: }
473: }
474:
1.66 nicm 475: /* Handle stopped children. */
1.160 nicm 476: static void
1.66 nicm 477: server_child_stopped(pid_t pid, int status)
1.31 nicm 478: {
1.66 nicm 479: struct window *w;
480: struct window_pane *wp;
1.31 nicm 481:
1.66 nicm 482: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
483: return;
1.31 nicm 484:
1.121 nicm 485: RB_FOREACH(w, windows, &windows) {
1.66 nicm 486: TAILQ_FOREACH(wp, &w->panes, entry) {
487: if (wp->pid == pid) {
488: if (killpg(pid, SIGCONT) != 0)
489: kill(pid, SIGCONT);
490: }
1.1 nicm 491: }
492: }
493: }
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