tmux.c revision 1.8 
1/* $OpenBSD: tmux.c,v 1.8 2009/06/05 07:22:23 nicm Exp $ */
2
3/*
4 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
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/stat.h>
21
22#include <errno.h>
23#include <paths.h>
24#include <pwd.h>
25#include <signal.h>
26#include <stdlib.h>
27#include <string.h>
28#include <syslog.h>
29#include <unistd.h>
30
31#include "tmux.h"
32
33#ifdef DEBUG
34const char	*malloc_options = "AFGJPX";
35#endif
36
37volatile sig_atomic_t sigwinch;
38volatile sig_atomic_t sigterm;
39volatile sig_atomic_t sigcont;
40volatile sig_atomic_t sigchld;
41volatile sig_atomic_t sigusr1;
42volatile sig_atomic_t sigusr2;
43
44char		*cfg_file;
45struct options	 global_options;
46struct options	 global_window_options;
47
48int		 server_locked;
49char		*server_password;
50time_t		 server_activity;
51
52int		 debug_level;
53int		 be_quiet;
54time_t		 start_time;
55char		*socket_path;
56
57__dead void	 usage(void);
58char 		*makesockpath(const char *);
59
60__dead void
61usage(void)
62{
63	fprintf(stderr,
64	    "usage: %s [-28dqUuv] [-f file] [-L socket-name] [-S socket-path]\n"
65	    "            [command [flags]]\n",
66	    __progname);
67	exit(1);
68}
69
70void
71logfile(const char *name)
72{
73	char	*path;
74
75	log_close();
76	if (debug_level > 0) {
77		xasprintf(
78		    &path, "%s-%s-%ld.log", __progname, name, (long) getpid());
79		log_open_file(debug_level, path);
80		xfree(path);
81	}
82}
83
84void
85sighandler(int sig)
86{
87	int	saved_errno;
88
89	saved_errno = errno;
90	switch (sig) {
91	case SIGWINCH:
92		sigwinch = 1;
93		break;
94	case SIGTERM:
95		sigterm = 1;
96		break;
97	case SIGCHLD:
98		sigchld = 1;
99		break;
100	case SIGCONT:
101		sigcont = 1;
102		break;
103	case SIGUSR1:
104		sigusr1 = 1;
105		break;
106	case SIGUSR2:
107		sigusr2 = 1;
108		break;
109	}
110	errno = saved_errno;
111}
112
113void
114siginit(void)
115{
116	struct sigaction	 act;
117
118	memset(&act, 0, sizeof act);
119	sigemptyset(&act.sa_mask);
120	act.sa_flags = SA_RESTART;
121
122	act.sa_handler = SIG_IGN;
123	if (sigaction(SIGPIPE, &act, NULL) != 0)
124		fatal("sigaction failed");
125	if (sigaction(SIGINT, &act, NULL) != 0)
126		fatal("sigaction failed");
127	if (sigaction(SIGTSTP, &act, NULL) != 0)
128		fatal("sigaction failed");
129	if (sigaction(SIGQUIT, &act, NULL) != 0)
130		fatal("sigaction failed");
131
132	act.sa_handler = sighandler;
133	if (sigaction(SIGWINCH, &act, NULL) != 0)
134		fatal("sigaction failed");
135	if (sigaction(SIGTERM, &act, NULL) != 0)
136		fatal("sigaction failed");
137	if (sigaction(SIGCHLD, &act, NULL) != 0)
138		fatal("sigaction failed");
139	if (sigaction(SIGUSR1, &act, NULL) != 0)
140		fatal("sigaction failed");
141	if (sigaction(SIGUSR2, &act, NULL) != 0)
142		fatal("sigaction failed");
143}
144
145void
146sigreset(void)
147{
148	struct sigaction act;
149
150	memset(&act, 0, sizeof act);
151	sigemptyset(&act.sa_mask);
152
153	act.sa_handler = SIG_DFL;
154	if (sigaction(SIGPIPE, &act, NULL) != 0)
155		fatal("sigaction failed");
156	if (sigaction(SIGUSR1, &act, NULL) != 0)
157		fatal("sigaction failed");
158	if (sigaction(SIGUSR2, &act, NULL) != 0)
159		fatal("sigaction failed");
160	if (sigaction(SIGINT, &act, NULL) != 0)
161		fatal("sigaction failed");
162	if (sigaction(SIGTSTP, &act, NULL) != 0)
163		fatal("sigaction failed");
164	if (sigaction(SIGQUIT, &act, NULL) != 0)
165		fatal("sigaction failed");
166	if (sigaction(SIGWINCH, &act, NULL) != 0)
167		fatal("sigaction failed");
168	if (sigaction(SIGTERM, &act, NULL) != 0)
169		fatal("sigaction failed");
170	if (sigaction(SIGCHLD, &act, NULL) != 0)
171		fatal("sigaction failed");
172}
173
174char *
175makesockpath(const char *label)
176{
177	char		base[MAXPATHLEN], *path;
178	struct stat	sb;
179	u_int		uid;
180
181	uid = getuid();
182	xsnprintf(base, MAXPATHLEN, "%s/%s-%d", _PATH_TMP, __progname, uid);
183
184	if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST)
185		return (NULL);
186
187	if (lstat(base, &sb) != 0)
188		return (NULL);
189	if (!S_ISDIR(sb.st_mode)) {
190		errno = ENOTDIR;
191		return (NULL);
192	}
193	if (sb.st_uid != uid || (sb.st_mode & (S_IRWXG|S_IRWXO)) != 0) {
194		errno = EACCES;
195		return (NULL);
196	}
197
198	xasprintf(&path, "%s/%s", base, label);
199	return (path);
200}
201
202int
203main(int argc, char **argv)
204{
205	struct client_ctx	 cctx;
206	struct msg_command_data	 cmddata;
207	struct buffer		*b;
208	struct cmd_list		*cmdlist;
209 	struct cmd		*cmd;
210	struct pollfd	 	 pfd;
211	struct hdr	 	 hdr;
212	const char		*shell;
213	struct passwd		*pw;
214	char			*s, *path, *label, *cause, *home, *pass = NULL;
215	char			 cwd[MAXPATHLEN];
216	int	 		 retcode, opt, flags, unlock, start_server;
217
218	unlock = flags = 0;
219	label = path = NULL;
220        while ((opt = getopt(argc, argv, "28df:L:qS:uUv")) != -1) {
221                switch (opt) {
222		case '2':
223			flags |= IDENTIFY_256COLOURS;
224			flags &= ~IDENTIFY_88COLOURS;
225			break;
226		case '8':
227			flags |= IDENTIFY_88COLOURS;
228			flags &= ~IDENTIFY_256COLOURS;
229			break;
230		case 'f':
231			if (cfg_file)
232				xfree(cfg_file);
233			cfg_file = xstrdup(optarg);
234			break;
235		case 'L':
236			if (path != NULL) {
237				log_warnx("-L and -S cannot be used together");
238				exit(1);
239			}
240			if (label != NULL)
241				xfree(label);
242			label = xstrdup(optarg);
243			break;
244		case 'S':
245			if (label != NULL) {
246				log_warnx("-L and -S cannot be used together");
247				exit(1);
248			}
249			if (path != NULL)
250				xfree(path);
251			path = xstrdup(optarg);
252			break;
253		case 'q':
254			be_quiet = 1;
255			break;
256		case 'u':
257			flags |= IDENTIFY_UTF8;
258			break;
259		case 'U':
260			unlock = 1;
261			break;
262		case 'd':
263			flags |= IDENTIFY_HASDEFAULTS;
264			break;
265		case 'v':
266			debug_level++;
267			break;
268                default:
269			usage();
270                }
271        }
272	argc -= optind;
273	argv += optind;
274
275	log_open_tty(debug_level);
276	siginit();
277
278	options_init(&global_options, NULL);
279	options_set_number(&global_options, "bell-action", BELL_ANY);
280	options_set_number(&global_options, "buffer-limit", 9);
281	options_set_number(&global_options, "display-time", 750);
282	options_set_number(&global_options, "history-limit", 2000);
283	options_set_number(&global_options, "lock-after-time", 0);
284	options_set_number(&global_options, "message-attr", GRID_ATTR_REVERSE);
285	options_set_number(&global_options, "message-bg", 3);
286	options_set_number(&global_options, "message-fg", 0);
287	options_set_number(&global_options, "prefix", '\002');
288	options_set_number(&global_options, "repeat-time", 500);
289	options_set_number(&global_options, "set-remain-on-exit", 0);
290	options_set_number(&global_options, "set-titles", 0);
291	options_set_number(&global_options, "status", 1);
292	options_set_number(&global_options, "status-attr", GRID_ATTR_REVERSE);
293	options_set_number(&global_options, "status-bg", 2);
294	options_set_number(&global_options, "status-fg", 0);
295	options_set_number(&global_options, "status-interval", 15);
296	options_set_number(&global_options, "status-keys", MODEKEY_EMACS);
297	options_set_number(&global_options, "status-left-length", 10);
298	options_set_number(&global_options, "status-right-length", 40);
299	options_set_string(&global_options, "status-left", "[#S]");
300	options_set_string(
301	    &global_options, "status-right", "\"#24T\" %%H:%%M %%d-%%b-%%y");
302	options_set_number(&global_options, "status-utf8", 0);
303
304	options_init(&global_window_options, NULL);
305	options_set_number(&global_window_options, "aggressive-resize", 0);
306	options_set_number(&global_window_options, "automatic-rename", 1);
307	options_set_number(&global_window_options, "clock-mode-colour", 4);
308	options_set_number(&global_window_options, "clock-mode-style", 1);
309	options_set_number(&global_window_options, "force-height", 0);
310	options_set_number(&global_window_options, "force-width", 0);
311	options_set_number(
312	    &global_window_options, "mode-attr", GRID_ATTR_REVERSE);
313	options_set_number(&global_window_options, "main-pane-width", 81);
314	options_set_number(&global_window_options, "main-pane-height", 24);
315	options_set_number(&global_window_options, "mode-bg", 3);
316	options_set_number(&global_window_options, "mode-fg", 0);
317	options_set_number(&global_window_options, "mode-keys", MODEKEY_EMACS);
318	options_set_number(&global_window_options, "monitor-activity", 0);
319	options_set_string(&global_window_options, "monitor-content", "%s", "");
320	options_set_number(&global_window_options, "utf8", 0);
321	options_set_number(&global_window_options, "window-status-attr", 0);
322	options_set_number(&global_window_options, "window-status-bg", 8);
323	options_set_number(&global_window_options, "window-status-fg", 8);
324	options_set_number(&global_window_options, "xterm-keys", 0);
325 	options_set_number(&global_window_options, "remain-on-exit", 0);
326
327	if (!(flags & IDENTIFY_UTF8)) {
328		/*
329		 * If the user has set whichever of LC_ALL, LC_CTYPE or LANG
330		 * exist (in that order) to contain UTF-8, it is a safe
331		 * assumption that either they are using a UTF-8 terminal, or
332		 * if not they know that output from UTF-8-capable programs may
333		 * be wrong.
334		 */
335		if ((s = getenv("LC_CTYPE")) == NULL) {
336			if ((s = getenv("LC_ALL")) == NULL)
337				s = getenv("LANG");
338		}
339		if (s != NULL && strcasestr(s, "UTF-8") != NULL)
340			flags |= IDENTIFY_UTF8;
341	}
342
343	if (cfg_file == NULL) {
344		home = getenv("HOME");
345		if (home == NULL || *home == '\0') {
346			pw = getpwuid(getuid());
347			if (pw != NULL)
348				home = pw->pw_dir;
349		}
350		xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG);
351		if (access(cfg_file, R_OK) != 0) {
352			xfree(cfg_file);
353			cfg_file = NULL;
354		}
355	} else {
356		if (access(cfg_file, R_OK) != 0) {
357			log_warn("%s", cfg_file);
358			exit(1);
359		}
360	}
361
362	if (label == NULL)
363		label = xstrdup("default");
364	if (path == NULL && (path = makesockpath(label)) == NULL) {
365		log_warn("can't create socket");
366		exit(1);
367	}
368	xfree(label);
369
370	shell = getenv("SHELL");
371	if (shell == NULL || *shell == '\0') {
372		pw = getpwuid(getuid());
373		if (pw != NULL)
374			shell = pw->pw_shell;
375		if (shell == NULL || *shell == '\0')
376			shell = _PATH_BSHELL;
377	}
378	options_set_string(
379	    &global_options, "default-command", "exec %s -l", shell);
380
381	if (getcwd(cwd, sizeof cwd) == NULL) {
382		log_warn("getcwd");
383		exit(1);
384	}
385	options_set_string(&global_options, "default-path", "%s", cwd);
386
387	if (unlock) {
388		if (argc != 0) {
389			log_warnx("can't specify a command when unlocking");
390			exit(1);
391		}
392		cmdlist = NULL;
393		if ((pass = getpass("Password: ")) == NULL)
394			exit(1);
395		start_server = 0;
396	} else {
397		if (argc == 0) {
398			cmd = xmalloc(sizeof *cmd);
399			cmd->entry = &cmd_new_session_entry;
400			cmd->entry->init(cmd, 0);
401
402			cmdlist = xmalloc(sizeof *cmdlist);
403			TAILQ_INIT(cmdlist);
404			TAILQ_INSERT_HEAD(cmdlist, cmd, qentry);
405		} else {
406			cmdlist = cmd_list_parse(argc, argv, &cause);
407			if (cmdlist == NULL) {
408				log_warnx("%s", cause);
409				exit(1);
410			}
411		}
412		start_server = 0;
413		TAILQ_FOREACH(cmd, cmdlist, qentry) {
414			if (cmd->entry->flags & CMD_STARTSERVER) {
415				start_server = 1;
416				break;
417			}
418		}
419	}
420
421 	memset(&cctx, 0, sizeof cctx);
422	if (client_init(path, &cctx, start_server, flags) != 0)
423		exit(1);
424	xfree(path);
425
426	b = buffer_create(BUFSIZ);
427	if (unlock) {
428		cmd_send_string(b, pass);
429		memset(pass, 0, strlen(pass));
430		client_write_server(
431		    &cctx, MSG_UNLOCK, BUFFER_OUT(b), BUFFER_USED(b));
432	} else {
433		cmd_list_send(cmdlist, b);
434		cmd_list_free(cmdlist);
435		client_fill_session(&cmddata);
436		client_write_server2(&cctx, MSG_COMMAND,
437		    &cmddata, sizeof cmddata, BUFFER_OUT(b), BUFFER_USED(b));
438	}
439	buffer_destroy(b);
440
441	retcode = 0;
442	for (;;) {
443		pfd.fd = cctx.srv_fd;
444		pfd.events = POLLIN;
445		if (BUFFER_USED(cctx.srv_out) > 0)
446			pfd.events |= POLLOUT;
447
448		if (poll(&pfd, 1, INFTIM) == -1) {
449			if (errno == EAGAIN || errno == EINTR)
450				continue;
451			fatal("poll failed");
452		}
453
454		if (buffer_poll(&pfd, cctx.srv_in, cctx.srv_out) != 0)
455			goto out;
456
457	restart:
458		if (BUFFER_USED(cctx.srv_in) < sizeof hdr)
459			continue;
460		memcpy(&hdr, BUFFER_OUT(cctx.srv_in), sizeof hdr);
461		if (BUFFER_USED(cctx.srv_in) < (sizeof hdr) + hdr.size)
462			continue;
463		buffer_remove(cctx.srv_in, sizeof hdr);
464
465		switch (hdr.type) {
466		case MSG_EXIT:
467		case MSG_SHUTDOWN:
468			goto out;
469		case MSG_ERROR:
470			retcode = 1;
471			/* FALLTHROUGH */
472		case MSG_PRINT:
473			if (hdr.size > INT_MAX - 1)
474				fatalx("bad MSG_PRINT size");
475			log_info("%.*s",
476			    (int) hdr.size, BUFFER_OUT(cctx.srv_in));
477			if (hdr.size != 0)
478				buffer_remove(cctx.srv_in, hdr.size);
479			goto restart;
480		case MSG_READY:
481			retcode = client_main(&cctx);
482			goto out;
483		default:
484			fatalx("unexpected command");
485		}
486	}
487
488out:
489	options_free(&global_options);
490	options_free(&global_window_options);
491
492	close(cctx.srv_fd);
493	buffer_destroy(cctx.srv_in);
494	buffer_destroy(cctx.srv_out);
495
496	return (retcode);
497}
498