tmux.c revision 1.160 
1/* $OpenBSD: tmux.c,v 1.160 2015/11/24 22:27:22 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
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
42char		*shell_cmd;
43struct timeval	 start_time;
44const char	*socket_path;
45
46__dead void	 usage(void);
47static char	*make_label(const char *);
48
49__dead void
50usage(void)
51{
52	fprintf(stderr,
53	    "usage: %s [-2Cluv] [-c shell-command] [-f file] [-L socket-name]\n"
54	    "            [-S socket-path] [command [flags]]\n",
55	    __progname);
56	exit(1);
57}
58
59const char *
60getshell(void)
61{
62	struct passwd	*pw;
63	const char	*shell;
64
65	shell = getenv("SHELL");
66	if (checkshell(shell))
67		return (shell);
68
69	pw = getpwuid(getuid());
70	if (pw != NULL && checkshell(pw->pw_shell))
71		return (pw->pw_shell);
72
73	return (_PATH_BSHELL);
74}
75
76int
77checkshell(const char *shell)
78{
79	if (shell == NULL || *shell == '\0' || *shell != '/')
80		return (0);
81	if (areshell(shell))
82		return (0);
83	if (access(shell, X_OK) != 0)
84		return (0);
85	return (1);
86}
87
88int
89areshell(const char *shell)
90{
91	const char	*progname, *ptr;
92
93	if ((ptr = strrchr(shell, '/')) != NULL)
94		ptr++;
95	else
96		ptr = shell;
97	progname = __progname;
98	if (*progname == '-')
99		progname++;
100	if (strcmp(ptr, progname) == 0)
101		return (1);
102	return (0);
103}
104
105static char *
106make_label(const char *label)
107{
108	char		*base, resolved[PATH_MAX], *path, *s;
109	struct stat	 sb;
110	u_int		 uid;
111	int		 saved_errno;
112
113	if (label == NULL)
114		label = "default";
115
116	uid = getuid();
117
118	if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0')
119		xasprintf(&base, "%s/tmux-%u", s, uid);
120	else
121		xasprintf(&base, "%s/tmux-%u", _PATH_TMP, uid);
122
123	if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST)
124		goto fail;
125
126	if (lstat(base, &sb) != 0)
127		goto fail;
128	if (!S_ISDIR(sb.st_mode)) {
129		errno = ENOTDIR;
130		goto fail;
131	}
132	if (sb.st_uid != uid || (sb.st_mode & S_IRWXO) != 0) {
133		errno = EACCES;
134		goto fail;
135	}
136
137	if (realpath(base, resolved) == NULL)
138		strlcpy(resolved, base, sizeof resolved);
139	xasprintf(&path, "%s/%s", resolved, label);
140	return (path);
141
142fail:
143	saved_errno = errno;
144	free(base);
145	errno = saved_errno;
146	return (NULL);
147}
148
149void
150setblocking(int fd, int state)
151{
152	int mode;
153
154	if ((mode = fcntl(fd, F_GETFL)) != -1) {
155		if (!state)
156			mode |= O_NONBLOCK;
157		else
158			mode &= ~O_NONBLOCK;
159		fcntl(fd, F_SETFL, mode);
160	}
161}
162
163const char *
164find_home(void)
165{
166	struct passwd		*pw;
167	static const char	*home;
168
169	if (home != NULL)
170		return (home);
171
172	home = getenv("HOME");
173	if (home == NULL || *home == '\0') {
174		pw = getpwuid(getuid());
175		if (pw != NULL)
176			home = pw->pw_dir;
177		else
178			home = NULL;
179	}
180
181	return (home);
182}
183
184int
185main(int argc, char **argv)
186{
187	char		*path, *label, **var, tmp[PATH_MAX];
188	const char	*s;
189	int		 opt, flags, keys;
190
191	setlocale(LC_TIME, "");
192	tzset();
193
194	if (**argv == '-')
195		flags = CLIENT_LOGIN;
196	else
197		flags = 0;
198
199	label = path = NULL;
200	while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUv")) != -1) {
201		switch (opt) {
202		case '2':
203			flags |= CLIENT_256COLOURS;
204			break;
205		case 'c':
206			free(shell_cmd);
207			shell_cmd = xstrdup(optarg);
208			break;
209		case 'C':
210			if (flags & CLIENT_CONTROL)
211				flags |= CLIENT_CONTROLCONTROL;
212			else
213				flags |= CLIENT_CONTROL;
214			break;
215		case 'f':
216			set_cfg_file(optarg);
217			break;
218		case 'l':
219			flags |= CLIENT_LOGIN;
220			break;
221		case 'L':
222			free(label);
223			label = xstrdup(optarg);
224			break;
225		case 'q':
226			break;
227		case 'S':
228			free(path);
229			path = xstrdup(optarg);
230			break;
231		case 'u':
232			flags |= CLIENT_UTF8;
233			break;
234		case 'v':
235			log_add_level();
236			break;
237		default:
238			usage();
239		}
240	}
241	argc -= optind;
242	argv += optind;
243
244	if (shell_cmd != NULL && argc != 0)
245		usage();
246
247	if (pledge("stdio rpath wpath cpath flock fattr unix getpw sendfd "
248	    "recvfd proc exec tty ps", NULL) != 0)
249		err(1, "pledge");
250
251	/*
252	 * tmux is a UTF-8 terminal, so if TMUX is set, assume UTF-8.
253	 * Otherwise, if the user has set LC_ALL, LC_CTYPE or LANG to contain
254	 * UTF-8, it is a safe assumption that either they are using a UTF-8
255	 * terminal, or if not they know that output from UTF-8-capable
256	 * programs may be wrong.
257	 */
258	if (getenv("TMUX") != NULL)
259		flags |= CLIENT_UTF8;
260	else {
261		s = getenv("LC_ALL");
262		if (s == NULL || *s == '\0')
263			s = getenv("LC_CTYPE");
264		if (s == NULL || *s == '\0')
265			s = getenv("LANG");
266		if (s == NULL || *s == '\0')
267			s = "";
268		if (strcasestr(s, "UTF-8") != NULL ||
269		    strcasestr(s, "UTF8") != NULL)
270			flags |= CLIENT_UTF8;
271	}
272
273	global_environ = environ_create();
274	for (var = environ; *var != NULL; var++)
275		environ_put(global_environ, *var);
276	if (getcwd(tmp, sizeof tmp) != NULL)
277		environ_set(global_environ, "PWD", tmp);
278
279	global_options = options_create(NULL);
280	options_table_populate_tree(OPTIONS_TABLE_SERVER, global_options);
281
282	global_s_options = options_create(NULL);
283	options_table_populate_tree(OPTIONS_TABLE_SESSION, global_s_options);
284	options_set_string(global_s_options, "default-shell", "%s", getshell());
285
286	global_w_options = options_create(NULL);
287	options_table_populate_tree(OPTIONS_TABLE_WINDOW, global_w_options);
288
289	/* Override keys to vi if VISUAL or EDITOR are set. */
290	if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) {
291		if (strrchr(s, '/') != NULL)
292			s = strrchr(s, '/') + 1;
293		if (strstr(s, "vi") != NULL)
294			keys = MODEKEY_VI;
295		else
296			keys = MODEKEY_EMACS;
297		options_set_number(global_s_options, "status-keys", keys);
298		options_set_number(global_w_options, "mode-keys", keys);
299	}
300
301	/*
302	 * If socket is specified on the command-line with -S or -L, it is
303	 * used. Otherwise, $TMUX is checked and if that fails "default" is
304	 * used.
305	 */
306	if (path == NULL && label == NULL) {
307		s = getenv("TMUX");
308		if (s != NULL && *s != '\0' && *s != ',') {
309			path = xstrdup(s);
310			path[strcspn (path, ",")] = '\0';
311		}
312	}
313	if (path == NULL && (path = make_label(label)) == NULL) {
314		fprintf(stderr, "can't create socket: %s\n", strerror(errno));
315		exit(1);
316	}
317	socket_path = path;
318	free(label);
319
320	/* Pass control to the client. */
321	exit(client_main(event_init(), argc, argv, flags));
322}
323