Annotation of src/usr.bin/tmux/server.c, Revision 1.174
1.174 ! nicm 1: /* $OpenBSD: server.c,v 1.173 2017/07/09 22:33:09 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;
1.1 nicm 144:
145: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
146: fatal("socketpair failed");
147:
1.174 ! nicm 148: switch (fork()) {
! 149: case -1:
! 150: fatal("fork failed");
! 151: case 0:
! 152: break;
! 153: default:
1.1 nicm 154: close(pair[1]);
155: return (pair[0]);
156: }
157: close(pair[0]);
1.174 ! nicm 158:
! 159: if (daemon(1, 0) != 0)
! 160: fatal("daemon failed");
! 161: proc_clear_signals(client);
! 162: if (event_reinit(base) != 0)
! 163: fatalx("event_reinit failed");
! 164: server_proc = proc_start("server");
! 165: proc_set_signals(server_proc, server_signal);
1.143 nicm 166:
1.171 nicm 167: if (log_get_level() > 1)
1.146 nicm 168: tty_create_log();
1.151 nicm 169: if (pledge("stdio rpath wpath cpath fattr unix getpw recvfd proc exec "
170: "tty ps", NULL) != 0)
1.143 nicm 171: fatal("pledge failed");
1.1 nicm 172:
1.121 nicm 173: RB_INIT(&windows);
1.102 nicm 174: RB_INIT(&all_window_panes);
1.122 nicm 175: TAILQ_INIT(&clients);
1.97 nicm 176: RB_INIT(&sessions);
1.166 nicm 177: RB_INIT(&session_groups);
1.1 nicm 178: key_bindings_init();
179:
1.153 nicm 180: gettimeofday(&start_time, NULL);
1.16 nicm 181:
1.66 nicm 182: server_fd = server_create_socket();
1.119 nicm 183: if (server_fd == -1)
184: fatal("couldn't create socket");
185: server_update_socket();
1.60 nicm 186: server_client_create(pair[1]);
1.103 nicm 187:
1.154 nicm 188: if (lockfd >= 0) {
189: unlink(lockfile);
190: free(lockfile);
191: close(lockfd);
192: }
1.16 nicm 193:
1.139 nicm 194: start_cfg();
1.66 nicm 195:
1.104 nicm 196: server_add_accept(0);
1.66 nicm 197:
1.144 nicm 198: proc_loop(server_proc, server_loop);
1.167 nicm 199:
200: LIST_FOREACH(job, &all_jobs, entry) {
201: if (job->pid != -1)
202: kill(job->pid, SIGTERM);
203: }
204:
1.129 nicm 205: status_prompt_save_history();
1.66 nicm 206: exit(0);
1.1 nicm 207: }
208:
1.144 nicm 209: /* Server loop callback. */
1.160 nicm 210: static int
1.66 nicm 211: server_loop(void)
1.1 nicm 212: {
1.144 nicm 213: struct client *c;
1.162 nicm 214: u_int items;
215:
216: do {
217: items = cmdq_next(NULL);
1.164 nicm 218: TAILQ_FOREACH(c, &clients, entry) {
219: if (c->flags & CLIENT_IDENTIFIED)
220: items += cmdq_next(c);
221: }
1.162 nicm 222: } while (items != 0);
1.31 nicm 223:
1.144 nicm 224: server_client_loop();
1.1 nicm 225:
1.145 nicm 226: if (!options_get_number(global_options, "exit-unattached")) {
1.97 nicm 227: if (!RB_EMPTY(&sessions))
228: return (0);
1.1 nicm 229: }
1.116 nicm 230:
1.122 nicm 231: TAILQ_FOREACH(c, &clients, entry) {
232: if (c->session != NULL)
1.116 nicm 233: return (0);
234: }
235:
236: /*
237: * No attached clients therefore want to exit - flush any waiting
238: * clients but don't actually exit until they've gone.
239: */
240: cmd_wait_for_flush();
1.122 nicm 241: if (!TAILQ_EMPTY(&clients))
242: return (0);
1.116 nicm 243:
1.66 nicm 244: return (1);
1.1 nicm 245: }
246:
1.141 nicm 247: /* Exit the server by killing all clients and windows. */
1.160 nicm 248: static void
1.141 nicm 249: server_send_exit(void)
1.1 nicm 250: {
1.122 nicm 251: struct client *c, *c1;
252: struct session *s, *s1;
1.116 nicm 253:
254: cmd_wait_for_flush();
1.1 nicm 255:
1.122 nicm 256: TAILQ_FOREACH_SAFE(c, &clients, entry, c1) {
1.144 nicm 257: if (c->flags & CLIENT_SUSPENDED)
1.122 nicm 258: server_client_lost(c);
259: else
1.144 nicm 260: proc_send(c->peer, MSG_SHUTDOWN, -1, NULL, 0);
1.122 nicm 261: c->session = NULL;
1.42 nicm 262: }
263:
1.122 nicm 264: RB_FOREACH_SAFE(s, sessions, &sessions, s1)
1.173 nicm 265: session_destroy(s, __func__);
1.66 nicm 266: }
267:
268: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 269: void
1.66 nicm 270: server_update_socket(void)
1.42 nicm 271: {
1.66 nicm 272: struct session *s;
273: static int last = -1;
1.93 nicm 274: int n, mode;
275: struct stat sb;
1.1 nicm 276:
1.66 nicm 277: n = 0;
1.97 nicm 278: RB_FOREACH(s, sessions, &sessions) {
279: if (!(s->flags & SESSION_UNATTACHED)) {
1.66 nicm 280: n++;
281: break;
282: }
283: }
284:
285: if (n != last) {
286: last = n;
1.93 nicm 287:
288: if (stat(socket_path, &sb) != 0)
289: return;
1.159 semarie 290: mode = sb.st_mode & ACCESSPERMS;
1.93 nicm 291: if (n != 0) {
292: if (mode & S_IRUSR)
293: mode |= S_IXUSR;
294: if (mode & S_IRGRP)
295: mode |= S_IXGRP;
296: if (mode & S_IROTH)
297: mode |= S_IXOTH;
298: } else
299: mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
300: chmod(socket_path, mode);
1.66 nicm 301: }
302: }
303:
304: /* Callback for server socket. */
1.160 nicm 305: static void
1.150 nicm 306: server_accept(int fd, short events, __unused void *data)
1.66 nicm 307: {
308: struct sockaddr_storage sa;
309: socklen_t slen = sizeof sa;
310: int newfd;
311:
1.104 nicm 312: server_add_accept(0);
1.66 nicm 313: if (!(events & EV_READ))
314: return;
315:
316: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
317: if (newfd == -1) {
318: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
319: return;
1.104 nicm 320: if (errno == ENFILE || errno == EMFILE) {
321: /* Delete and don't try again for 1 second. */
322: server_add_accept(1);
323: return;
324: }
1.66 nicm 325: fatal("accept failed");
326: }
1.141 nicm 327: if (server_exit) {
1.66 nicm 328: close(newfd);
329: return;
1.42 nicm 330: }
1.66 nicm 331: server_client_create(newfd);
332: }
333:
1.104 nicm 334: /*
335: * Add accept event. If timeout is nonzero, add as a timeout instead of a read
336: * event - used to backoff when running out of file descriptors.
337: */
338: void
339: server_add_accept(int timeout)
340: {
341: struct timeval tv = { timeout, 0 };
342:
343: if (event_initialized(&server_ev_accept))
344: event_del(&server_ev_accept);
345:
346: if (timeout == 0) {
1.144 nicm 347: event_set(&server_ev_accept, server_fd, EV_READ, server_accept,
348: NULL);
1.104 nicm 349: event_add(&server_ev_accept, NULL);
350: } else {
1.144 nicm 351: event_set(&server_ev_accept, server_fd, EV_TIMEOUT,
352: server_accept, NULL);
1.104 nicm 353: event_add(&server_ev_accept, &tv);
354: }
355: }
356:
1.66 nicm 357: /* Signal handler. */
1.160 nicm 358: static void
1.144 nicm 359: server_signal(int sig)
1.66 nicm 360: {
1.119 nicm 361: int fd;
1.120 nicm 362:
1.173 nicm 363: log_debug("%s: %s", __func__, strsignal(sig));
1.66 nicm 364: switch (sig) {
365: case SIGTERM:
1.141 nicm 366: server_exit = 1;
367: server_send_exit();
1.66 nicm 368: break;
369: case SIGCHLD:
370: server_child_signal();
371: break;
372: case SIGUSR1:
373: event_del(&server_ev_accept);
1.119 nicm 374: fd = server_create_socket();
375: if (fd != -1) {
376: close(server_fd);
377: server_fd = fd;
378: server_update_socket();
379: }
1.104 nicm 380: server_add_accept(0);
1.171 nicm 381: break;
382: case SIGUSR2:
383: proc_toggle_log(server_proc);
1.66 nicm 384: break;
1.1 nicm 385: }
386: }
387:
388: /* Handle SIGCHLD. */
1.160 nicm 389: static void
1.1 nicm 390: server_child_signal(void)
391: {
1.66 nicm 392: int status;
393: pid_t pid;
1.1 nicm 394:
395: for (;;) {
396: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
397: case -1:
398: if (errno == ECHILD)
399: return;
1.39 nicm 400: fatal("waitpid failed");
1.1 nicm 401: case 0:
402: return;
403: }
1.66 nicm 404: if (WIFSTOPPED(status))
405: server_child_stopped(pid, status);
1.79 nicm 406: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 407: server_child_exited(pid, status);
408: }
409: }
410:
411: /* Handle exited children. */
1.160 nicm 412: static void
1.66 nicm 413: server_child_exited(pid_t pid, int status)
414: {
1.121 nicm 415: struct window *w, *w1;
1.66 nicm 416: struct window_pane *wp;
417: struct job *job;
418:
1.121 nicm 419: RB_FOREACH_SAFE(w, windows, &windows, w1) {
1.66 nicm 420: TAILQ_FOREACH(wp, &w->panes, entry) {
421: if (wp->pid == pid) {
1.118 nicm 422: wp->status = status;
1.172 nicm 423:
424: log_debug("%%%u exited", wp->id);
425: wp->flags |= PANE_EXITED;
426:
427: if (window_pane_destroy_ready(wp))
428: server_destroy_pane(wp, 1);
1.77 nicm 429: break;
1.53 nicm 430: }
431: }
1.80 nicm 432: }
1.1 nicm 433:
1.167 nicm 434: LIST_FOREACH(job, &all_jobs, entry) {
1.66 nicm 435: if (pid == job->pid) {
1.67 nicm 436: job_died(job, status); /* might free job */
437: break;
1.1 nicm 438: }
1.53 nicm 439: }
440: }
441:
1.66 nicm 442: /* Handle stopped children. */
1.160 nicm 443: static void
1.66 nicm 444: server_child_stopped(pid_t pid, int status)
1.31 nicm 445: {
1.66 nicm 446: struct window *w;
447: struct window_pane *wp;
1.31 nicm 448:
1.66 nicm 449: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
450: return;
1.31 nicm 451:
1.121 nicm 452: RB_FOREACH(w, windows, &windows) {
1.66 nicm 453: TAILQ_FOREACH(wp, &w->panes, entry) {
454: if (wp->pid == pid) {
455: if (killpg(pid, SIGCONT) != 0)
456: kill(pid, SIGCONT);
457: }
1.1 nicm 458: }
459: }
460: }
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