Annotation of src/usr.bin/tmux/server.c, Revision 1.175
1.175 ! nicm 1: /* $OpenBSD: server.c,v 1.174 2017/07/12 09:24:17 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_create_socket(void);
54: static int server_loop(void);
55: static void server_send_exit(void);
56: static void server_accept(int, short, void *);
57: static void server_signal(int);
58: static void server_child_signal(void);
59: static void server_child_exited(pid_t, int);
60: static void server_child_stopped(pid_t, int);
1.126 nicm 61:
62: /* Set marked pane. */
63: void
64: server_set_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
65: {
1.169 nicm 66: cmd_find_clear_state(&marked_pane, 0);
1.155 nicm 67: marked_pane.s = s;
68: marked_pane.wl = wl;
69: marked_pane.w = wl->window;
70: marked_pane.wp = wp;
1.126 nicm 71: }
72:
73: /* Clear marked pane. */
74: void
75: server_clear_marked(void)
76: {
1.169 nicm 77: cmd_find_clear_state(&marked_pane, 0);
1.126 nicm 78: }
79:
80: /* Is this the marked pane? */
81: int
82: server_is_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
83: {
84: if (s == NULL || wl == NULL || wp == NULL)
85: return (0);
1.155 nicm 86: if (marked_pane.s != s || marked_pane.wl != wl)
1.126 nicm 87: return (0);
1.155 nicm 88: if (marked_pane.wp != wp)
1.126 nicm 89: return (0);
90: return (server_check_marked());
91: }
92:
93: /* Check if the marked pane is still valid. */
94: int
95: server_check_marked(void)
96: {
1.155 nicm 97: return (cmd_find_valid_state(&marked_pane));
1.126 nicm 98: }
1.45 nicm 99:
1.60 nicm 100: /* Create server socket. */
1.160 nicm 101: static int
1.60 nicm 102: server_create_socket(void)
1.1 nicm 103: {
1.60 nicm 104: struct sockaddr_un sa;
105: size_t size;
106: mode_t mask;
1.100 nicm 107: int fd;
1.60 nicm 108:
109: memset(&sa, 0, sizeof sa);
110: sa.sun_family = AF_UNIX;
111: size = strlcpy(sa.sun_path, socket_path, sizeof sa.sun_path);
112: if (size >= sizeof sa.sun_path) {
113: errno = ENAMETOOLONG;
1.119 nicm 114: return (-1);
1.60 nicm 115: }
116: unlink(sa.sun_path);
117:
118: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.119 nicm 119: return (-1);
1.60 nicm 120:
1.89 nicm 121: mask = umask(S_IXUSR|S_IXGRP|S_IRWXO);
1.170 nicm 122: if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) == -1) {
123: close(fd);
1.119 nicm 124: return (-1);
1.170 nicm 125: }
1.60 nicm 126: umask(mask);
127:
1.170 nicm 128: if (listen(fd, 128) == -1) {
129: close(fd);
1.119 nicm 130: return (-1);
1.170 nicm 131: }
1.100 nicm 132: setblocking(fd, 0);
1.1 nicm 133:
1.60 nicm 134: return (fd);
135: }
136:
1.1 nicm 137: /* Fork new server. */
138: int
1.174 nicm 139: server_start(struct tmuxproc *client, struct event_base *base, int lockfd,
140: char *lockfile)
1.1 nicm 141: {
1.167 nicm 142: int pair[2];
143: struct job *job;
1.175 ! nicm 144: sigset_t set, oldset;
1.1 nicm 145:
146: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
147: fatal("socketpair failed");
148:
1.175 ! nicm 149: sigfillset(&set);
! 150: sigprocmask(SIG_BLOCK, &set, &oldset);
1.174 nicm 151: switch (fork()) {
152: case -1:
153: fatal("fork failed");
154: case 0:
155: break;
156: default:
1.175 ! nicm 157: sigprocmask(SIG_SETMASK, &oldset, NULL);
1.1 nicm 158: close(pair[1]);
159: return (pair[0]);
160: }
161: close(pair[0]);
1.174 nicm 162: if (daemon(1, 0) != 0)
163: fatal("daemon failed");
164: proc_clear_signals(client);
165: if (event_reinit(base) != 0)
166: fatalx("event_reinit failed");
167: server_proc = proc_start("server");
168: proc_set_signals(server_proc, server_signal);
1.175 ! nicm 169: sigprocmask(SIG_SETMASK, &oldset, NULL);
1.143 nicm 170:
1.171 nicm 171: if (log_get_level() > 1)
1.146 nicm 172: tty_create_log();
1.151 nicm 173: if (pledge("stdio rpath wpath cpath fattr unix getpw recvfd proc exec "
174: "tty ps", NULL) != 0)
1.143 nicm 175: fatal("pledge failed");
1.1 nicm 176:
1.121 nicm 177: RB_INIT(&windows);
1.102 nicm 178: RB_INIT(&all_window_panes);
1.122 nicm 179: TAILQ_INIT(&clients);
1.97 nicm 180: RB_INIT(&sessions);
1.166 nicm 181: RB_INIT(&session_groups);
1.1 nicm 182: key_bindings_init();
183:
1.153 nicm 184: gettimeofday(&start_time, NULL);
1.16 nicm 185:
1.66 nicm 186: server_fd = server_create_socket();
1.119 nicm 187: if (server_fd == -1)
188: fatal("couldn't create socket");
189: server_update_socket();
1.60 nicm 190: server_client_create(pair[1]);
1.103 nicm 191:
1.154 nicm 192: if (lockfd >= 0) {
193: unlink(lockfile);
194: free(lockfile);
195: close(lockfd);
196: }
1.16 nicm 197:
1.139 nicm 198: start_cfg();
1.66 nicm 199:
1.104 nicm 200: server_add_accept(0);
1.66 nicm 201:
1.144 nicm 202: proc_loop(server_proc, server_loop);
1.167 nicm 203:
204: LIST_FOREACH(job, &all_jobs, entry) {
205: if (job->pid != -1)
206: kill(job->pid, SIGTERM);
207: }
208:
1.129 nicm 209: status_prompt_save_history();
1.66 nicm 210: exit(0);
1.1 nicm 211: }
212:
1.144 nicm 213: /* Server loop callback. */
1.160 nicm 214: static int
1.66 nicm 215: server_loop(void)
1.1 nicm 216: {
1.144 nicm 217: struct client *c;
1.162 nicm 218: u_int items;
219:
220: do {
221: items = cmdq_next(NULL);
1.164 nicm 222: TAILQ_FOREACH(c, &clients, entry) {
223: if (c->flags & CLIENT_IDENTIFIED)
224: items += cmdq_next(c);
225: }
1.162 nicm 226: } while (items != 0);
1.31 nicm 227:
1.144 nicm 228: server_client_loop();
1.1 nicm 229:
1.145 nicm 230: if (!options_get_number(global_options, "exit-unattached")) {
1.97 nicm 231: if (!RB_EMPTY(&sessions))
232: return (0);
1.1 nicm 233: }
1.116 nicm 234:
1.122 nicm 235: TAILQ_FOREACH(c, &clients, entry) {
236: if (c->session != NULL)
1.116 nicm 237: return (0);
238: }
239:
240: /*
241: * No attached clients therefore want to exit - flush any waiting
242: * clients but don't actually exit until they've gone.
243: */
244: cmd_wait_for_flush();
1.122 nicm 245: if (!TAILQ_EMPTY(&clients))
246: return (0);
1.116 nicm 247:
1.66 nicm 248: return (1);
1.1 nicm 249: }
250:
1.141 nicm 251: /* Exit the server by killing all clients and windows. */
1.160 nicm 252: static void
1.141 nicm 253: server_send_exit(void)
1.1 nicm 254: {
1.122 nicm 255: struct client *c, *c1;
256: struct session *s, *s1;
1.116 nicm 257:
258: cmd_wait_for_flush();
1.1 nicm 259:
1.122 nicm 260: TAILQ_FOREACH_SAFE(c, &clients, entry, c1) {
1.144 nicm 261: if (c->flags & CLIENT_SUSPENDED)
1.122 nicm 262: server_client_lost(c);
263: else
1.144 nicm 264: proc_send(c->peer, MSG_SHUTDOWN, -1, NULL, 0);
1.122 nicm 265: c->session = NULL;
1.42 nicm 266: }
267:
1.122 nicm 268: RB_FOREACH_SAFE(s, sessions, &sessions, s1)
1.173 nicm 269: session_destroy(s, __func__);
1.66 nicm 270: }
271:
272: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 273: void
1.66 nicm 274: server_update_socket(void)
1.42 nicm 275: {
1.66 nicm 276: struct session *s;
277: static int last = -1;
1.93 nicm 278: int n, mode;
279: struct stat sb;
1.1 nicm 280:
1.66 nicm 281: n = 0;
1.97 nicm 282: RB_FOREACH(s, sessions, &sessions) {
283: if (!(s->flags & SESSION_UNATTACHED)) {
1.66 nicm 284: n++;
285: break;
286: }
287: }
288:
289: if (n != last) {
290: last = n;
1.93 nicm 291:
292: if (stat(socket_path, &sb) != 0)
293: return;
1.159 semarie 294: mode = sb.st_mode & ACCESSPERMS;
1.93 nicm 295: if (n != 0) {
296: if (mode & S_IRUSR)
297: mode |= S_IXUSR;
298: if (mode & S_IRGRP)
299: mode |= S_IXGRP;
300: if (mode & S_IROTH)
301: mode |= S_IXOTH;
302: } else
303: mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
304: chmod(socket_path, mode);
1.66 nicm 305: }
306: }
307:
308: /* Callback for server socket. */
1.160 nicm 309: static void
1.150 nicm 310: server_accept(int fd, short events, __unused void *data)
1.66 nicm 311: {
312: struct sockaddr_storage sa;
313: socklen_t slen = sizeof sa;
314: int newfd;
315:
1.104 nicm 316: server_add_accept(0);
1.66 nicm 317: if (!(events & EV_READ))
318: return;
319:
320: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
321: if (newfd == -1) {
322: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
323: return;
1.104 nicm 324: if (errno == ENFILE || errno == EMFILE) {
325: /* Delete and don't try again for 1 second. */
326: server_add_accept(1);
327: return;
328: }
1.66 nicm 329: fatal("accept failed");
330: }
1.141 nicm 331: if (server_exit) {
1.66 nicm 332: close(newfd);
333: return;
1.42 nicm 334: }
1.66 nicm 335: server_client_create(newfd);
336: }
337:
1.104 nicm 338: /*
339: * Add accept event. If timeout is nonzero, add as a timeout instead of a read
340: * event - used to backoff when running out of file descriptors.
341: */
342: void
343: server_add_accept(int timeout)
344: {
345: struct timeval tv = { timeout, 0 };
346:
347: if (event_initialized(&server_ev_accept))
348: event_del(&server_ev_accept);
349:
350: if (timeout == 0) {
1.144 nicm 351: event_set(&server_ev_accept, server_fd, EV_READ, server_accept,
352: NULL);
1.104 nicm 353: event_add(&server_ev_accept, NULL);
354: } else {
1.144 nicm 355: event_set(&server_ev_accept, server_fd, EV_TIMEOUT,
356: server_accept, NULL);
1.104 nicm 357: event_add(&server_ev_accept, &tv);
358: }
359: }
360:
1.66 nicm 361: /* Signal handler. */
1.160 nicm 362: static void
1.144 nicm 363: server_signal(int sig)
1.66 nicm 364: {
1.119 nicm 365: int fd;
1.120 nicm 366:
1.173 nicm 367: log_debug("%s: %s", __func__, strsignal(sig));
1.66 nicm 368: switch (sig) {
369: case SIGTERM:
1.141 nicm 370: server_exit = 1;
371: server_send_exit();
1.66 nicm 372: break;
373: case SIGCHLD:
374: server_child_signal();
375: break;
376: case SIGUSR1:
377: event_del(&server_ev_accept);
1.119 nicm 378: fd = server_create_socket();
379: if (fd != -1) {
380: close(server_fd);
381: server_fd = fd;
382: server_update_socket();
383: }
1.104 nicm 384: server_add_accept(0);
1.171 nicm 385: break;
386: case SIGUSR2:
387: proc_toggle_log(server_proc);
1.66 nicm 388: break;
1.1 nicm 389: }
390: }
391:
392: /* Handle SIGCHLD. */
1.160 nicm 393: static void
1.1 nicm 394: server_child_signal(void)
395: {
1.66 nicm 396: int status;
397: pid_t pid;
1.1 nicm 398:
399: for (;;) {
400: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
401: case -1:
402: if (errno == ECHILD)
403: return;
1.39 nicm 404: fatal("waitpid failed");
1.1 nicm 405: case 0:
406: return;
407: }
1.66 nicm 408: if (WIFSTOPPED(status))
409: server_child_stopped(pid, status);
1.79 nicm 410: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 411: server_child_exited(pid, status);
412: }
413: }
414:
415: /* Handle exited children. */
1.160 nicm 416: static void
1.66 nicm 417: server_child_exited(pid_t pid, int status)
418: {
1.121 nicm 419: struct window *w, *w1;
1.66 nicm 420: struct window_pane *wp;
421: struct job *job;
422:
1.121 nicm 423: RB_FOREACH_SAFE(w, windows, &windows, w1) {
1.66 nicm 424: TAILQ_FOREACH(wp, &w->panes, entry) {
425: if (wp->pid == pid) {
1.118 nicm 426: wp->status = status;
1.172 nicm 427:
428: log_debug("%%%u exited", wp->id);
429: wp->flags |= PANE_EXITED;
430:
431: if (window_pane_destroy_ready(wp))
432: server_destroy_pane(wp, 1);
1.77 nicm 433: break;
1.53 nicm 434: }
435: }
1.80 nicm 436: }
1.1 nicm 437:
1.167 nicm 438: LIST_FOREACH(job, &all_jobs, entry) {
1.66 nicm 439: if (pid == job->pid) {
1.67 nicm 440: job_died(job, status); /* might free job */
441: break;
1.1 nicm 442: }
1.53 nicm 443: }
444: }
445:
1.66 nicm 446: /* Handle stopped children. */
1.160 nicm 447: static void
1.66 nicm 448: server_child_stopped(pid_t pid, int status)
1.31 nicm 449: {
1.66 nicm 450: struct window *w;
451: struct window_pane *wp;
1.31 nicm 452:
1.66 nicm 453: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
454: return;
1.31 nicm 455:
1.121 nicm 456: RB_FOREACH(w, windows, &windows) {
1.66 nicm 457: TAILQ_FOREACH(wp, &w->panes, entry) {
458: if (wp->pid == pid) {
459: if (killpg(pid, SIGCONT) != 0)
460: kill(pid, SIGCONT);
461: }
1.1 nicm 462: }
463: }
464: }
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