tmux.c revision 1.173 
1/* $OpenBSD: tmux.c,v 1.173 2016/12/09 21:39:27 nicm Exp $ */
2
3/*
4 * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
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 <langinfo.h>
28#include <locale.h>
29#include <paths.h>
30#include <pwd.h>
31#include <stdlib.h>
32#include <string.h>
33#include <time.h>
34#include <unistd.h>
35
36#include "tmux.h"
37
38struct options	*global_options;	/* server options */
39struct options	*global_s_options;	/* session options */
40struct options	*global_w_options;	/* window options */
41struct environ	*global_environ;
42struct hooks	*global_hooks;
43
44struct timeval	 start_time;
45const char	*socket_path;
46
47static __dead void	 usage(void);
48static char		*make_label(const char *);
49
50static const char	*getshell(void);
51static int		 checkshell(const char *);
52
53static __dead void
54usage(void)
55{
56	fprintf(stderr,
57	    "usage: %s [-2Cluv] [-c shell-command] [-f file] [-L socket-name]\n"
58	    "            [-S socket-path] [command [flags]]\n",
59	    getprogname());
60	exit(1);
61}
62
63static const char *
64getshell(void)
65{
66	struct passwd	*pw;
67	const char	*shell;
68
69	shell = getenv("SHELL");
70	if (checkshell(shell))
71		return (shell);
72
73	pw = getpwuid(getuid());
74	if (pw != NULL && checkshell(pw->pw_shell))
75		return (pw->pw_shell);
76
77	return (_PATH_BSHELL);
78}
79
80static int
81checkshell(const char *shell)
82{
83	if (shell == NULL || *shell == '\0' || *shell != '/')
84		return (0);
85	if (areshell(shell))
86		return (0);
87	if (access(shell, X_OK) != 0)
88		return (0);
89	return (1);
90}
91
92int
93areshell(const char *shell)
94{
95	const char	*progname, *ptr;
96
97	if ((ptr = strrchr(shell, '/')) != NULL)
98		ptr++;
99	else
100		ptr = shell;
101	progname = getprogname();
102	if (*progname == '-')
103		progname++;
104	if (strcmp(ptr, progname) == 0)
105		return (1);
106	return (0);
107}
108
109static char *
110make_label(const char *label)
111{
112	char		*base, resolved[PATH_MAX], *path, *s;
113	struct stat	 sb;
114	u_int		 uid;
115	int		 saved_errno;
116
117	if (label == NULL)
118		label = "default";
119
120	uid = getuid();
121
122	if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0')
123		xasprintf(&base, "%s/tmux-%u", s, uid);
124	else
125		xasprintf(&base, "%s/tmux-%u", _PATH_TMP, uid);
126
127	if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST)
128		goto fail;
129
130	if (lstat(base, &sb) != 0)
131		goto fail;
132	if (!S_ISDIR(sb.st_mode)) {
133		errno = ENOTDIR;
134		goto fail;
135	}
136	if (sb.st_uid != uid || (sb.st_mode & S_IRWXO) != 0) {
137		errno = EACCES;
138		goto fail;
139	}
140
141	if (realpath(base, resolved) == NULL)
142		strlcpy(resolved, base, sizeof resolved);
143	xasprintf(&path, "%s/%s", resolved, label);
144	return (path);
145
146fail:
147	saved_errno = errno;
148	free(base);
149	errno = saved_errno;
150	return (NULL);
151}
152
153void
154setblocking(int fd, int state)
155{
156	int mode;
157
158	if ((mode = fcntl(fd, F_GETFL)) != -1) {
159		if (!state)
160			mode |= O_NONBLOCK;
161		else
162			mode &= ~O_NONBLOCK;
163		fcntl(fd, F_SETFL, mode);
164	}
165}
166
167const char *
168find_home(void)
169{
170	struct passwd		*pw;
171	static const char	*home;
172
173	if (home != NULL)
174		return (home);
175
176	home = getenv("HOME");
177	if (home == NULL || *home == '\0') {
178		pw = getpwuid(getuid());
179		if (pw != NULL)
180			home = pw->pw_dir;
181		else
182			home = NULL;
183	}
184
185	return (home);
186}
187
188int
189main(int argc, char **argv)
190{
191	char		*path, *label, **var, tmp[PATH_MAX], *shellcmd = NULL;
192	const char	*s;
193	int		 opt, flags, keys;
194
195	if (setlocale(LC_CTYPE, "en_US.UTF-8") == NULL) {
196		if (setlocale(LC_CTYPE, "") == NULL)
197			errx(1, "invalid LC_ALL, LC_CTYPE or LANG");
198		s = nl_langinfo(CODESET);
199		if (strcasecmp(s, "UTF-8") != 0 && strcasecmp(s, "UTF8") != 0)
200			errx(1, "need UTF-8 locale (LC_CTYPE) but have %s", s);
201	}
202
203	setlocale(LC_TIME, "");
204	tzset();
205
206	if (**argv == '-')
207		flags = CLIENT_LOGIN;
208	else
209		flags = 0;
210
211	label = path = NULL;
212	while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUv")) != -1) {
213		switch (opt) {
214		case '2':
215			flags |= CLIENT_256COLOURS;
216			break;
217		case 'c':
218			free(shellcmd);
219			shellcmd = xstrdup(optarg);
220			break;
221		case 'C':
222			if (flags & CLIENT_CONTROL)
223				flags |= CLIENT_CONTROLCONTROL;
224			else
225				flags |= CLIENT_CONTROL;
226			break;
227		case 'f':
228			set_cfg_file(optarg);
229			break;
230		case 'l':
231			flags |= CLIENT_LOGIN;
232			break;
233		case 'L':
234			free(label);
235			label = xstrdup(optarg);
236			break;
237		case 'q':
238			break;
239		case 'S':
240			free(path);
241			path = xstrdup(optarg);
242			break;
243		case 'u':
244			flags |= CLIENT_UTF8;
245			break;
246		case 'v':
247			log_add_level();
248			break;
249		default:
250			usage();
251		}
252	}
253	argc -= optind;
254	argv += optind;
255
256	if (shellcmd != NULL && argc != 0)
257		usage();
258
259	if (pledge("stdio rpath wpath cpath flock fattr unix getpw sendfd "
260	    "recvfd proc exec tty ps", NULL) != 0)
261		err(1, "pledge");
262
263	/*
264	 * tmux is a UTF-8 terminal, so if TMUX is set, assume UTF-8.
265	 * Otherwise, if the user has set LC_ALL, LC_CTYPE or LANG to contain
266	 * UTF-8, it is a safe assumption that either they are using a UTF-8
267	 * terminal, or if not they know that output from UTF-8-capable
268	 * programs may be wrong.
269	 */
270	if (getenv("TMUX") != NULL)
271		flags |= CLIENT_UTF8;
272	else {
273		s = getenv("LC_ALL");
274		if (s == NULL || *s == '\0')
275			s = getenv("LC_CTYPE");
276		if (s == NULL || *s == '\0')
277			s = getenv("LANG");
278		if (s == NULL || *s == '\0')
279			s = "";
280		if (strcasestr(s, "UTF-8") != NULL ||
281		    strcasestr(s, "UTF8") != NULL)
282			flags |= CLIENT_UTF8;
283	}
284
285	global_hooks = hooks_create(NULL);
286
287	global_environ = environ_create();
288	for (var = environ; *var != NULL; var++)
289		environ_put(global_environ, *var);
290	if (getcwd(tmp, sizeof tmp) != NULL)
291		environ_set(global_environ, "PWD", "%s", tmp);
292
293	global_options = options_create(NULL);
294	options_table_populate_tree(OPTIONS_TABLE_SERVER, global_options);
295
296	global_s_options = options_create(NULL);
297	options_table_populate_tree(OPTIONS_TABLE_SESSION, global_s_options);
298	options_set_string(global_s_options, "default-shell", "%s", getshell());
299
300	global_w_options = options_create(NULL);
301	options_table_populate_tree(OPTIONS_TABLE_WINDOW, global_w_options);
302
303	/* Override keys to vi if VISUAL or EDITOR are set. */
304	if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) {
305		if (strrchr(s, '/') != NULL)
306			s = strrchr(s, '/') + 1;
307		if (strstr(s, "vi") != NULL)
308			keys = MODEKEY_VI;
309		else
310			keys = MODEKEY_EMACS;
311		options_set_number(global_s_options, "status-keys", keys);
312		options_set_number(global_w_options, "mode-keys", keys);
313	}
314
315	/*
316	 * If socket is specified on the command-line with -S or -L, it is
317	 * used. Otherwise, $TMUX is checked and if that fails "default" is
318	 * used.
319	 */
320	if (path == NULL && label == NULL) {
321		s = getenv("TMUX");
322		if (s != NULL && *s != '\0' && *s != ',') {
323			path = xstrdup(s);
324			path[strcspn(path, ",")] = '\0';
325		}
326	}
327	if (path == NULL && (path = make_label(label)) == NULL) {
328		fprintf(stderr, "can't create socket: %s\n", strerror(errno));
329		exit(1);
330	}
331	socket_path = path;
332	free(label);
333
334	/* Pass control to the client. */
335	exit(client_main(event_init(), argc, argv, flags, shellcmd));
336}
337