Annotation of src/usr.bin/tmux/server.c, Revision 1.168
1.168 ! nicm 1: /* $OpenBSD: server.c,v 1.167 2017/04/20 09:20:22 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: {
1.155 nicm 66: cmd_find_clear_state(&marked_pane, NULL, 0);
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: {
1.155 nicm 77: cmd_find_clear_state(&marked_pane, NULL, 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);
1.140 guenther 122: if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) == -1)
1.119 nicm 123: return (-1);
1.60 nicm 124: umask(mask);
125:
1.158 nicm 126: if (listen(fd, 128) == -1)
1.119 nicm 127: return (-1);
1.100 nicm 128: setblocking(fd, 0);
1.1 nicm 129:
1.60 nicm 130: return (fd);
131: }
132:
1.1 nicm 133: /* Fork new server. */
134: int
1.138 nicm 135: server_start(struct event_base *base, int lockfd, char *lockfile)
1.1 nicm 136: {
1.167 nicm 137: int pair[2];
138: struct job *job;
1.1 nicm 139:
140: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
141: fatal("socketpair failed");
142:
1.144 nicm 143: server_proc = proc_start("server", base, 1, server_signal);
144: if (server_proc == NULL) {
1.1 nicm 145: close(pair[1]);
146: return (pair[0]);
147: }
148: close(pair[0]);
1.143 nicm 149:
1.152 nicm 150: if (log_get_level() > 3)
1.146 nicm 151: tty_create_log();
1.151 nicm 152: if (pledge("stdio rpath wpath cpath fattr unix getpw recvfd proc exec "
153: "tty ps", NULL) != 0)
1.143 nicm 154: fatal("pledge failed");
1.1 nicm 155:
1.121 nicm 156: RB_INIT(&windows);
1.102 nicm 157: RB_INIT(&all_window_panes);
1.122 nicm 158: TAILQ_INIT(&clients);
1.97 nicm 159: RB_INIT(&sessions);
1.166 nicm 160: RB_INIT(&session_groups);
1.1 nicm 161: key_bindings_init();
162:
1.153 nicm 163: gettimeofday(&start_time, NULL);
1.16 nicm 164:
1.66 nicm 165: server_fd = server_create_socket();
1.119 nicm 166: if (server_fd == -1)
167: fatal("couldn't create socket");
168: server_update_socket();
1.60 nicm 169: server_client_create(pair[1]);
1.103 nicm 170:
1.154 nicm 171: if (lockfd >= 0) {
172: unlink(lockfile);
173: free(lockfile);
174: close(lockfd);
175: }
1.16 nicm 176:
1.139 nicm 177: start_cfg();
1.66 nicm 178:
1.104 nicm 179: server_add_accept(0);
1.66 nicm 180:
1.144 nicm 181: proc_loop(server_proc, server_loop);
1.167 nicm 182:
183: LIST_FOREACH(job, &all_jobs, entry) {
184: if (job->pid != -1)
185: kill(job->pid, SIGTERM);
186: }
187:
1.129 nicm 188: status_prompt_save_history();
1.66 nicm 189: exit(0);
1.1 nicm 190: }
191:
1.144 nicm 192: /* Server loop callback. */
1.160 nicm 193: static int
1.66 nicm 194: server_loop(void)
1.1 nicm 195: {
1.144 nicm 196: struct client *c;
1.162 nicm 197: u_int items;
198:
199: do {
200: items = cmdq_next(NULL);
1.164 nicm 201: TAILQ_FOREACH(c, &clients, entry) {
202: if (c->flags & CLIENT_IDENTIFIED)
203: items += cmdq_next(c);
204: }
1.162 nicm 205: } while (items != 0);
1.31 nicm 206:
1.144 nicm 207: server_client_loop();
1.1 nicm 208:
1.145 nicm 209: if (!options_get_number(global_options, "exit-unattached")) {
1.97 nicm 210: if (!RB_EMPTY(&sessions))
211: return (0);
1.1 nicm 212: }
1.116 nicm 213:
1.122 nicm 214: TAILQ_FOREACH(c, &clients, entry) {
215: if (c->session != NULL)
1.116 nicm 216: return (0);
217: }
218:
219: /*
220: * No attached clients therefore want to exit - flush any waiting
221: * clients but don't actually exit until they've gone.
222: */
223: cmd_wait_for_flush();
1.122 nicm 224: if (!TAILQ_EMPTY(&clients))
225: return (0);
1.116 nicm 226:
1.66 nicm 227: return (1);
1.1 nicm 228: }
229:
1.141 nicm 230: /* Exit the server by killing all clients and windows. */
1.160 nicm 231: static void
1.141 nicm 232: server_send_exit(void)
1.1 nicm 233: {
1.122 nicm 234: struct client *c, *c1;
235: struct session *s, *s1;
1.116 nicm 236:
237: cmd_wait_for_flush();
1.1 nicm 238:
1.122 nicm 239: TAILQ_FOREACH_SAFE(c, &clients, entry, c1) {
1.144 nicm 240: if (c->flags & CLIENT_SUSPENDED)
1.122 nicm 241: server_client_lost(c);
242: else
1.144 nicm 243: proc_send(c->peer, MSG_SHUTDOWN, -1, NULL, 0);
1.122 nicm 244: c->session = NULL;
1.42 nicm 245: }
246:
1.122 nicm 247: RB_FOREACH_SAFE(s, sessions, &sessions, s1)
1.97 nicm 248: session_destroy(s);
1.66 nicm 249: }
250:
251: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 252: void
1.66 nicm 253: server_update_socket(void)
1.42 nicm 254: {
1.66 nicm 255: struct session *s;
256: static int last = -1;
1.93 nicm 257: int n, mode;
258: struct stat sb;
1.1 nicm 259:
1.66 nicm 260: n = 0;
1.97 nicm 261: RB_FOREACH(s, sessions, &sessions) {
262: if (!(s->flags & SESSION_UNATTACHED)) {
1.66 nicm 263: n++;
264: break;
265: }
266: }
267:
268: if (n != last) {
269: last = n;
1.93 nicm 270:
271: if (stat(socket_path, &sb) != 0)
272: return;
1.159 semarie 273: mode = sb.st_mode & ACCESSPERMS;
1.93 nicm 274: if (n != 0) {
275: if (mode & S_IRUSR)
276: mode |= S_IXUSR;
277: if (mode & S_IRGRP)
278: mode |= S_IXGRP;
279: if (mode & S_IROTH)
280: mode |= S_IXOTH;
281: } else
282: mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
283: chmod(socket_path, mode);
1.66 nicm 284: }
285: }
286:
287: /* Callback for server socket. */
1.160 nicm 288: static void
1.150 nicm 289: server_accept(int fd, short events, __unused void *data)
1.66 nicm 290: {
291: struct sockaddr_storage sa;
292: socklen_t slen = sizeof sa;
293: int newfd;
294:
1.104 nicm 295: server_add_accept(0);
1.66 nicm 296: if (!(events & EV_READ))
297: return;
298:
299: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
300: if (newfd == -1) {
301: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
302: return;
1.104 nicm 303: if (errno == ENFILE || errno == EMFILE) {
304: /* Delete and don't try again for 1 second. */
305: server_add_accept(1);
306: return;
307: }
1.66 nicm 308: fatal("accept failed");
309: }
1.141 nicm 310: if (server_exit) {
1.66 nicm 311: close(newfd);
312: return;
1.42 nicm 313: }
1.66 nicm 314: server_client_create(newfd);
315: }
316:
1.104 nicm 317: /*
318: * Add accept event. If timeout is nonzero, add as a timeout instead of a read
319: * event - used to backoff when running out of file descriptors.
320: */
321: void
322: server_add_accept(int timeout)
323: {
324: struct timeval tv = { timeout, 0 };
325:
326: if (event_initialized(&server_ev_accept))
327: event_del(&server_ev_accept);
328:
329: if (timeout == 0) {
1.144 nicm 330: event_set(&server_ev_accept, server_fd, EV_READ, server_accept,
331: NULL);
1.104 nicm 332: event_add(&server_ev_accept, NULL);
333: } else {
1.144 nicm 334: event_set(&server_ev_accept, server_fd, EV_TIMEOUT,
335: server_accept, NULL);
1.104 nicm 336: event_add(&server_ev_accept, &tv);
337: }
338: }
339:
1.66 nicm 340: /* Signal handler. */
1.160 nicm 341: static void
1.144 nicm 342: server_signal(int sig)
1.66 nicm 343: {
1.119 nicm 344: int fd;
1.120 nicm 345:
1.66 nicm 346: switch (sig) {
347: case SIGTERM:
1.141 nicm 348: server_exit = 1;
349: server_send_exit();
1.66 nicm 350: break;
351: case SIGCHLD:
352: server_child_signal();
353: break;
354: case SIGUSR1:
355: event_del(&server_ev_accept);
1.119 nicm 356: fd = server_create_socket();
357: if (fd != -1) {
358: close(server_fd);
359: server_fd = fd;
360: server_update_socket();
361: }
1.104 nicm 362: server_add_accept(0);
1.66 nicm 363: break;
1.1 nicm 364: }
365: }
366:
367: /* Handle SIGCHLD. */
1.160 nicm 368: static void
1.1 nicm 369: server_child_signal(void)
370: {
1.66 nicm 371: int status;
372: pid_t pid;
1.1 nicm 373:
374: for (;;) {
375: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
376: case -1:
377: if (errno == ECHILD)
378: return;
1.39 nicm 379: fatal("waitpid failed");
1.1 nicm 380: case 0:
381: return;
382: }
1.66 nicm 383: if (WIFSTOPPED(status))
384: server_child_stopped(pid, status);
1.79 nicm 385: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 386: server_child_exited(pid, status);
387: }
388: }
389:
390: /* Handle exited children. */
1.160 nicm 391: static void
1.66 nicm 392: server_child_exited(pid_t pid, int status)
393: {
1.121 nicm 394: struct window *w, *w1;
1.66 nicm 395: struct window_pane *wp;
396: struct job *job;
397:
1.121 nicm 398: RB_FOREACH_SAFE(w, windows, &windows, w1) {
1.66 nicm 399: TAILQ_FOREACH(wp, &w->panes, entry) {
400: if (wp->pid == pid) {
1.118 nicm 401: wp->status = status;
1.156 nicm 402: server_destroy_pane(wp, 1);
1.77 nicm 403: break;
1.53 nicm 404: }
405: }
1.80 nicm 406: }
1.1 nicm 407:
1.167 nicm 408: LIST_FOREACH(job, &all_jobs, entry) {
1.66 nicm 409: if (pid == job->pid) {
1.67 nicm 410: job_died(job, status); /* might free job */
411: break;
1.1 nicm 412: }
1.53 nicm 413: }
414: }
415:
1.66 nicm 416: /* Handle stopped children. */
1.160 nicm 417: static void
1.66 nicm 418: server_child_stopped(pid_t pid, int status)
1.31 nicm 419: {
1.66 nicm 420: struct window *w;
421: struct window_pane *wp;
1.31 nicm 422:
1.66 nicm 423: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
424: return;
1.31 nicm 425:
1.121 nicm 426: RB_FOREACH(w, windows, &windows) {
1.66 nicm 427: TAILQ_FOREACH(wp, &w->panes, entry) {
428: if (wp->pid == pid) {
429: if (killpg(pid, SIGCONT) != 0)
430: kill(pid, SIGCONT);
431: }
1.1 nicm 432: }
433: }
434: }
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