tmux.c revision 1.149 
1/* $OpenBSD: tmux.c,v 1.149 2015/10/28 09:51:55 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 <err.h>
23#include <errno.h>
24#include <event.h>
25#include <fcntl.h>
26#include <getopt.h>
27#include <locale.h>
28#include <paths.h>
29#include <pwd.h>
30#include <stdlib.h>
31#include <string.h>
32#include <time.h>
33#include <unistd.h>
34
35#include "tmux.h"
36
37#ifdef DEBUG
38extern char	*malloc_options;
39#endif
40
41struct options	*global_options;	/* server options */
42struct options	*global_s_options;	/* session options */
43struct options	*global_w_options;	/* window options */
44struct environ	*global_environ;
45
46char		*shell_cmd;
47int		 debug_level;
48time_t		 start_time;
49char		 socket_path[PATH_MAX];
50
51__dead void	 usage(void);
52char 		*makesocketpath(const char *);
53
54__dead void
55usage(void)
56{
57	fprintf(stderr,
58	    "usage: %s [-2Cluv] [-c shell-command] [-f file] [-L socket-name]\n"
59	    "            [-S socket-path] [command [flags]]\n",
60	    __progname);
61	exit(1);
62}
63
64void
65logfile(const char *name)
66{
67	char	*path;
68
69	if (debug_level > 0) {
70		xasprintf(&path, "tmux-%s-%ld.log", name, (long) getpid());
71		log_open(path);
72		free(path);
73	}
74}
75
76const char *
77getshell(void)
78{
79	struct passwd	*pw;
80	const char	*shell;
81
82	shell = getenv("SHELL");
83	if (checkshell(shell))
84		return (shell);
85
86	pw = getpwuid(getuid());
87	if (pw != NULL && checkshell(pw->pw_shell))
88		return (pw->pw_shell);
89
90	return (_PATH_BSHELL);
91}
92
93int
94checkshell(const char *shell)
95{
96	if (shell == NULL || *shell == '\0' || *shell != '/')
97		return (0);
98	if (areshell(shell))
99		return (0);
100	if (access(shell, X_OK) != 0)
101		return (0);
102	return (1);
103}
104
105int
106areshell(const char *shell)
107{
108	const char	*progname, *ptr;
109
110	if ((ptr = strrchr(shell, '/')) != NULL)
111		ptr++;
112	else
113		ptr = shell;
114	progname = __progname;
115	if (*progname == '-')
116		progname++;
117	if (strcmp(ptr, progname) == 0)
118		return (1);
119	return (0);
120}
121
122char *
123makesocketpath(const char *label)
124{
125	char		base[PATH_MAX], realbase[PATH_MAX], *path, *s;
126	struct stat	sb;
127	u_int		uid;
128
129	uid = getuid();
130	if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0')
131		xsnprintf(base, sizeof base, "%s/tmux-%u", s, uid);
132	else
133		xsnprintf(base, sizeof base, "%s/tmux-%u", _PATH_TMP, uid);
134
135	if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST)
136		return (NULL);
137
138	if (lstat(base, &sb) != 0)
139		return (NULL);
140	if (!S_ISDIR(sb.st_mode)) {
141		errno = ENOTDIR;
142		return (NULL);
143	}
144	if (sb.st_uid != uid || (sb.st_mode & S_IRWXO) != 0) {
145		errno = EACCES;
146		return (NULL);
147	}
148
149	if (realpath(base, realbase) == NULL)
150		strlcpy(realbase, base, sizeof realbase);
151
152	xasprintf(&path, "%s/%s", realbase, label);
153	return (path);
154}
155
156void
157setblocking(int fd, int state)
158{
159	int mode;
160
161	if ((mode = fcntl(fd, F_GETFL)) != -1) {
162		if (!state)
163			mode |= O_NONBLOCK;
164		else
165			mode &= ~O_NONBLOCK;
166		fcntl(fd, F_SETFL, mode);
167	}
168}
169
170const char *
171find_home(void)
172{
173	struct passwd		*pw;
174	static const char	*home;
175
176	if (home != NULL)
177		return (home);
178
179	home = getenv("HOME");
180	if (home == NULL || *home == '\0') {
181		pw = getpwuid(getuid());
182		if (pw != NULL)
183			home = pw->pw_dir;
184		else
185			home = NULL;
186	}
187
188	return (home);
189}
190
191int
192main(int argc, char **argv)
193{
194	char	*s, *path, *label, **var, tmp[PATH_MAX];
195	int	 opt, flags, keys;
196
197#ifdef DEBUG
198	malloc_options = (char *) "AFGJPX";
199#endif
200
201	setlocale(LC_TIME, "");
202	tzset();
203
204	if (**argv == '-')
205		flags = CLIENT_LOGIN;
206	else
207		flags = 0;
208
209	label = path = NULL;
210	while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUv")) != -1) {
211		switch (opt) {
212		case '2':
213			flags |= CLIENT_256COLOURS;
214			break;
215		case 'c':
216			free(shell_cmd);
217			shell_cmd = xstrdup(optarg);
218			break;
219		case 'C':
220			if (flags & CLIENT_CONTROL)
221				flags |= CLIENT_CONTROLCONTROL;
222			else
223				flags |= CLIENT_CONTROL;
224			break;
225		case 'f':
226			set_cfg_file(optarg);
227			break;
228		case 'l':
229			flags |= CLIENT_LOGIN;
230			break;
231		case 'L':
232			free(label);
233			label = xstrdup(optarg);
234			break;
235		case 'q':
236			break;
237		case 'S':
238			free(path);
239			path = xstrdup(optarg);
240			break;
241		case 'u':
242			flags |= CLIENT_UTF8;
243			break;
244		case 'v':
245			debug_level++;
246			break;
247		default:
248			usage();
249		}
250	}
251	argc -= optind;
252	argv += optind;
253
254	if (shell_cmd != NULL && argc != 0)
255		usage();
256
257	if (pledge("stdio rpath wpath cpath flock fattr unix sendfd recvfd "
258	    "proc exec tty ps", NULL) != 0)
259		err(1, "pledge");
260
261	if (!(flags & CLIENT_UTF8)) {
262		/*
263		 * If the user has set whichever of LC_ALL, LC_CTYPE or LANG
264		 * exist (in that order) to contain UTF-8, it is a safe
265		 * assumption that either they are using a UTF-8 terminal, or
266		 * if not they know that output from UTF-8-capable programs may
267		 * be wrong.
268		 */
269		if ((s = getenv("LC_ALL")) == NULL || *s == '\0') {
270			if ((s = getenv("LC_CTYPE")) == NULL || *s == '\0')
271				s = getenv("LANG");
272		}
273		if (s != NULL && (strcasestr(s, "UTF-8") != NULL ||
274		    strcasestr(s, "UTF8") != NULL))
275			flags |= CLIENT_UTF8;
276	}
277
278	global_environ = environ_create();
279	for (var = environ; *var != NULL; var++)
280		environ_put(global_environ, *var);
281	if (getcwd(tmp, sizeof tmp) != NULL)
282		environ_set(global_environ, "PWD", tmp);
283
284	global_options = options_create(NULL);
285	options_table_populate_tree(server_options_table, global_options);
286
287	global_s_options = options_create(NULL);
288	options_table_populate_tree(session_options_table, global_s_options);
289	options_set_string(global_s_options, "default-shell", "%s", getshell());
290
291	global_w_options = options_create(NULL);
292	options_table_populate_tree(window_options_table, global_w_options);
293
294	/* Enable UTF-8 if the first client is on UTF-8 terminal. */
295	if (flags & CLIENT_UTF8) {
296		options_set_number(global_s_options, "status-utf8", 1);
297		options_set_number(global_s_options, "mouse-utf8", 1);
298		options_set_number(global_w_options, "utf8", 1);
299	}
300
301	/* Override keys to vi if VISUAL or EDITOR are set. */
302	if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) {
303		if (strrchr(s, '/') != NULL)
304			s = strrchr(s, '/') + 1;
305		if (strstr(s, "vi") != NULL)
306			keys = MODEKEY_VI;
307		else
308			keys = MODEKEY_EMACS;
309		options_set_number(global_s_options, "status-keys", keys);
310		options_set_number(global_w_options, "mode-keys", keys);
311	}
312
313	/*
314	 * Figure out the socket path. If specified on the command-line with -S
315	 * or -L, use it, otherwise try $TMUX or assume -L default.
316	 */
317	if (path == NULL) {
318		/* If no -L, use the environment. */
319		if (label == NULL) {
320			s = getenv("TMUX");
321			if (s != NULL) {
322				path = xstrdup(s);
323				path[strcspn (path, ",")] = '\0';
324				if (*path == '\0') {
325					free(path);
326					label = xstrdup("default");
327				}
328			} else
329				label = xstrdup("default");
330		}
331
332		/* -L or default set. */
333		if (label != NULL) {
334			if ((path = makesocketpath(label)) == NULL) {
335				fprintf(stderr, "can't create socket: %s\n",
336				    strerror(errno));
337				exit(1);
338			}
339		}
340	}
341	free(label);
342
343	if (strlcpy(socket_path, path, sizeof socket_path) >=
344	    sizeof socket_path) {
345		fprintf(stderr, "socket path too long: %s\n", path);
346		exit(1);
347	}
348	free(path);
349
350	/* Pass control to the client. */
351	exit(client_main(event_init(), argc, argv, flags));
352}
353