tmux.c revision 1.108 
1/* $OpenBSD: tmux.c,v 1.108 2012/01/21 08:40:09 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 <event.h>
24#include <fcntl.h>
25#include <paths.h>
26#include <pwd.h>
27#include <stdlib.h>
28#include <string.h>
29#include <unistd.h>
30
31#include "tmux.h"
32
33#ifdef DEBUG
34extern char	*malloc_options;
35#endif
36
37struct options	 global_options;	/* server options */
38struct options	 global_s_options;	/* session options */
39struct options	 global_w_options;	/* window options */
40struct environ	 global_environ;
41
42struct event_base *ev_base;
43
44char		*cfg_file;
45char		*shell_cmd;
46int		 debug_level;
47time_t		 start_time;
48char		 socket_path[MAXPATHLEN];
49int		 login_shell;
50char		*environ_path;
51pid_t		 environ_pid = -1;
52int		 environ_idx = -1;
53
54__dead void	 usage(void);
55void	 	 parseenvironment(void);
56char 		*makesocketpath(const char *);
57
58__dead void
59usage(void)
60{
61	fprintf(stderr,
62	    "usage: %s [-28lquv] [-c shell-command] [-f file] [-L socket-name]\n"
63	    "            [-S socket-path] [command [flags]]\n",
64	    __progname);
65	exit(1);
66}
67
68void
69logfile(const char *name)
70{
71	char	*path;
72
73	log_close();
74	if (debug_level > 0) {
75		xasprintf(&path, "tmux-%s-%ld.log", name, (long) getpid());
76		log_open_file(debug_level, path);
77		xfree(path);
78	}
79}
80
81const char *
82getshell(void)
83{
84	struct passwd	*pw;
85	const char	*shell;
86
87	shell = getenv("SHELL");
88	if (checkshell(shell))
89		return (shell);
90
91	pw = getpwuid(getuid());
92	if (pw != NULL && checkshell(pw->pw_shell))
93		return (pw->pw_shell);
94
95	return (_PATH_BSHELL);
96}
97
98int
99checkshell(const char *shell)
100{
101	if (shell == NULL || *shell == '\0' || *shell != '/')
102		return (0);
103	if (areshell(shell))
104		return (0);
105	if (access(shell, X_OK) != 0)
106		return (0);
107	return (1);
108}
109
110int
111areshell(const char *shell)
112{
113	const char	*progname, *ptr;
114
115	if ((ptr = strrchr(shell, '/')) != NULL)
116		ptr++;
117	else
118		ptr = shell;
119	progname = __progname;
120	if (*progname == '-')
121		progname++;
122	if (strcmp(ptr, progname) == 0)
123		return (1);
124	return (0);
125}
126
127const char*
128get_full_path(const char *wd, const char *path)
129{
130	static char	newpath[MAXPATHLEN];
131	char		oldpath[MAXPATHLEN];
132
133	if (getcwd(oldpath, sizeof oldpath) == NULL)
134		return (NULL);
135	if (chdir(wd) != 0)
136		return (NULL);
137	if (realpath(path, newpath) != 0)
138		return (NULL);
139	chdir(oldpath);
140	return (newpath);
141}
142
143void
144parseenvironment(void)
145{
146	char	*env, path[256];
147	long	 pid;
148	int	 idx;
149
150	if ((env = getenv("TMUX")) == NULL)
151		return;
152
153	if (sscanf(env, "%255[^,],%ld,%d", path, &pid, &idx) != 3)
154		return;
155	environ_path = xstrdup(path);
156	environ_pid = pid;
157	environ_idx = idx;
158}
159
160char *
161makesocketpath(const char *label)
162{
163	char		base[MAXPATHLEN], *path, *s;
164	struct stat	sb;
165	u_int		uid;
166
167	uid = getuid();
168	if ((s = getenv("TMPDIR")) == NULL || *s == '\0')
169		xsnprintf(base, sizeof base, "%s/tmux-%u", _PATH_TMP, uid);
170	else
171		xsnprintf(base, sizeof base, "%s/tmux-%u", s, uid);
172
173	if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST)
174		return (NULL);
175
176	if (lstat(base, &sb) != 0)
177		return (NULL);
178	if (!S_ISDIR(sb.st_mode)) {
179		errno = ENOTDIR;
180		return (NULL);
181	}
182	if (sb.st_uid != uid || (sb.st_mode & (S_IRWXG|S_IRWXO)) != 0) {
183		errno = EACCES;
184		return (NULL);
185	}
186
187	xasprintf(&path, "%s/%s", base, label);
188	return (path);
189}
190
191void
192setblocking(int fd, int state)
193{
194	int mode;
195
196	if ((mode = fcntl(fd, F_GETFL)) != -1) {
197		if (!state)
198			mode |= O_NONBLOCK;
199		else
200			mode &= ~O_NONBLOCK;
201		fcntl(fd, F_SETFL, mode);
202	}
203}
204
205__dead void
206shell_exec(const char *shell, const char *shellcmd)
207{
208	const char	*shellname, *ptr;
209	char		*argv0;
210
211	ptr = strrchr(shell, '/');
212	if (ptr != NULL && *(ptr + 1) != '\0')
213		shellname = ptr + 1;
214	else
215		shellname = shell;
216	if (login_shell)
217		xasprintf(&argv0, "-%s", shellname);
218	else
219		xasprintf(&argv0, "%s", shellname);
220	setenv("SHELL", shell, 1);
221
222	setblocking(STDIN_FILENO, 1);
223	setblocking(STDOUT_FILENO, 1);
224	setblocking(STDERR_FILENO, 1);
225	closefrom(STDERR_FILENO + 1);
226
227	execl(shell, argv0, "-c", shellcmd, (char *) NULL);
228	fatal("execl failed");
229}
230
231int
232main(int argc, char **argv)
233{
234	struct passwd	*pw;
235	char		*s, *path, *label, *home, **var;
236	int	 	 opt, flags, quiet, keys;
237
238#ifdef DEBUG
239	malloc_options = (char *) "AFGJPX";
240#endif
241
242	quiet = flags = 0;
243	label = path = NULL;
244	login_shell = (**argv == '-');
245	while ((opt = getopt(argc, argv, "28c:df:lL:qS:uUv")) != -1) {
246		switch (opt) {
247		case '2':
248			flags |= IDENTIFY_256COLOURS;
249			flags &= ~IDENTIFY_88COLOURS;
250			break;
251		case '8':
252			flags |= IDENTIFY_88COLOURS;
253			flags &= ~IDENTIFY_256COLOURS;
254			break;
255		case 'c':
256			if (shell_cmd != NULL)
257				xfree(shell_cmd);
258			shell_cmd = xstrdup(optarg);
259			break;
260		case 'f':
261			if (cfg_file != NULL)
262				xfree(cfg_file);
263			cfg_file = xstrdup(optarg);
264			break;
265		case 'l':
266			login_shell = 1;
267			break;
268		case 'L':
269			if (label != NULL)
270				xfree(label);
271			label = xstrdup(optarg);
272			break;
273		case 'q':
274			quiet = 1;
275			break;
276		case 'S':
277			if (path != NULL)
278				xfree(path);
279			path = xstrdup(optarg);
280			break;
281		case 'u':
282			flags |= IDENTIFY_UTF8;
283			break;
284		case 'v':
285			debug_level++;
286			break;
287		default:
288			usage();
289		}
290	}
291	argc -= optind;
292	argv += optind;
293
294	if (shell_cmd != NULL && argc != 0)
295		usage();
296
297	log_open_tty(debug_level);
298
299	if (!(flags & IDENTIFY_UTF8)) {
300		/*
301		 * If the user has set whichever of LC_ALL, LC_CTYPE or LANG
302		 * exist (in that order) to contain UTF-8, it is a safe
303		 * assumption that either they are using a UTF-8 terminal, or
304		 * if not they know that output from UTF-8-capable programs may
305		 * be wrong.
306		 */
307		if ((s = getenv("LC_ALL")) == NULL || *s == '\0') {
308			if ((s = getenv("LC_CTYPE")) == NULL || *s == '\0')
309				s = getenv("LANG");
310		}
311		if (s != NULL && (strcasestr(s, "UTF-8") != NULL ||
312		    strcasestr(s, "UTF8") != NULL))
313			flags |= IDENTIFY_UTF8;
314	}
315
316	environ_init(&global_environ);
317	for (var = environ; *var != NULL; var++)
318		environ_put(&global_environ, *var);
319
320	options_init(&global_options, NULL);
321	options_table_populate_tree(server_options_table, &global_options);
322	options_set_number(&global_options, "quiet", quiet);
323
324	options_init(&global_s_options, NULL);
325	options_table_populate_tree(session_options_table, &global_s_options);
326	options_set_string(&global_s_options, "default-shell", "%s", getshell());
327
328	options_init(&global_w_options, NULL);
329	options_table_populate_tree(window_options_table, &global_w_options);
330
331	/* Enable UTF-8 if the first client is on UTF-8 terminal. */
332	if (flags & IDENTIFY_UTF8) {
333		options_set_number(&global_s_options, "status-utf8", 1);
334		options_set_number(&global_s_options, "mouse-utf8", 1);
335		options_set_number(&global_w_options, "utf8", 1);
336	}
337
338	/* Override keys to vi if VISUAL or EDITOR are set. */
339	if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) {
340		if (strrchr(s, '/') != NULL)
341			s = strrchr(s, '/') + 1;
342		if (strstr(s, "vi") != NULL)
343			keys = MODEKEY_VI;
344		else
345			keys = MODEKEY_EMACS;
346		options_set_number(&global_s_options, "status-keys", keys);
347		options_set_number(&global_w_options, "mode-keys", keys);
348	}
349
350	/* Locate the configuration file. */
351	if (cfg_file == NULL) {
352		home = getenv("HOME");
353		if (home == NULL || *home == '\0') {
354			pw = getpwuid(getuid());
355			if (pw != NULL)
356				home = pw->pw_dir;
357		}
358		xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG);
359		if (access(cfg_file, R_OK) != 0 && errno == ENOENT) {
360			xfree(cfg_file);
361			cfg_file = NULL;
362		}
363	}
364
365	/*
366	 * Figure out the socket path. If specified on the command-line with -S
367	 * or -L, use it, otherwise try $TMUX or assume -L default.
368	 */
369	parseenvironment();
370	if (path == NULL) {
371		/* If no -L, use the environment. */
372		if (label == NULL) {
373			if (environ_path != NULL)
374				path = xstrdup(environ_path);
375			else
376				label = xstrdup("default");
377		}
378
379		/* -L or default set. */
380		if (label != NULL) {
381			if ((path = makesocketpath(label)) == NULL) {
382				log_warn("can't create socket");
383				exit(1);
384			}
385		}
386	}
387	if (label != NULL)
388		xfree(label);
389	if (realpath(path, socket_path) == NULL)
390		strlcpy(socket_path, path, sizeof socket_path);
391	xfree(path);
392
393	/* Set process title. */
394	setproctitle("%s (%s)", __progname, socket_path);
395
396	/* Pass control to the client. */
397	ev_base = event_init();
398	exit(client_main(argc, argv, flags));
399}
400