tmux.c revision 1.119 
1/* $OpenBSD: tmux.c,v 1.119 2013/04/11 21:52:18 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 <locale.h>
26#include <paths.h>
27#include <pwd.h>
28#include <stdlib.h>
29#include <string.h>
30#include <unistd.h>
31
32#include "tmux.h"
33
34#ifdef DEBUG
35extern char	*malloc_options;
36#endif
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;
42
43struct event_base *ev_base;
44
45char		*cfg_file;
46char		*shell_cmd;
47int		 debug_level;
48time_t		 start_time;
49char		 socket_path[MAXPATHLEN];
50int		 login_shell;
51char		*environ_path;
52pid_t		 environ_pid = -1;
53int		 environ_session_id = -1;
54
55__dead void	 usage(void);
56void	 	 parseenvironment(void);
57char 		*makesocketpath(const char *);
58
59__dead void
60usage(void)
61{
62	fprintf(stderr,
63	    "usage: %s [-28lquv] [-c shell-command] [-f file] [-L socket-name]\n"
64	    "            [-S socket-path] [command [flags]]\n",
65	    __progname);
66	exit(1);
67}
68
69void
70logfile(const char *name)
71{
72	char	*path;
73
74	if (debug_level > 0) {
75		xasprintf(&path, "tmux-%s-%ld.log", name, (long) getpid());
76		log_open(debug_level, path);
77		free(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	 id;
149
150	if ((env = getenv("TMUX")) == NULL)
151		return;
152
153	if (sscanf(env, "%255[^,],%ld,%d", path, &pid, &id) != 3)
154		return;
155	environ_path = xstrdup(path);
156	environ_pid = pid;
157	environ_session_id = id;
158}
159
160char *
161makesocketpath(const char *label)
162{
163	char		base[MAXPATHLEN], realbase[MAXPATHLEN], *path, *s;
164	struct stat	sb;
165	u_int		uid;
166
167	uid = getuid();
168	if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0')
169		xsnprintf(base, sizeof base, "%s/", s);
170	else if ((s = getenv("TMPDIR")) != NULL && *s != '\0')
171		xsnprintf(base, sizeof base, "%s/tmux-%u", s, uid);
172	else
173		xsnprintf(base, sizeof base, "%s/tmux-%u", _PATH_TMP, uid);
174
175	if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST)
176		return (NULL);
177
178	if (lstat(base, &sb) != 0)
179		return (NULL);
180	if (!S_ISDIR(sb.st_mode)) {
181		errno = ENOTDIR;
182		return (NULL);
183	}
184	if (sb.st_uid != uid || (sb.st_mode & (S_IRWXG|S_IRWXO)) != 0) {
185		errno = EACCES;
186		return (NULL);
187	}
188
189	if (realpath(base, realbase) == NULL)
190		strlcpy(realbase, base, sizeof realbase);
191
192	xasprintf(&path, "%s/%s", realbase, label);
193	return (path);
194}
195
196void
197setblocking(int fd, int state)
198{
199	int mode;
200
201	if ((mode = fcntl(fd, F_GETFL)) != -1) {
202		if (!state)
203			mode |= O_NONBLOCK;
204		else
205			mode &= ~O_NONBLOCK;
206		fcntl(fd, F_SETFL, mode);
207	}
208}
209
210__dead void
211shell_exec(const char *shell, const char *shellcmd)
212{
213	const char	*shellname, *ptr;
214	char		*argv0;
215
216	ptr = strrchr(shell, '/');
217	if (ptr != NULL && *(ptr + 1) != '\0')
218		shellname = ptr + 1;
219	else
220		shellname = shell;
221	if (login_shell)
222		xasprintf(&argv0, "-%s", shellname);
223	else
224		xasprintf(&argv0, "%s", shellname);
225	setenv("SHELL", shell, 1);
226
227	setblocking(STDIN_FILENO, 1);
228	setblocking(STDOUT_FILENO, 1);
229	setblocking(STDERR_FILENO, 1);
230	closefrom(STDERR_FILENO + 1);
231
232	execl(shell, argv0, "-c", shellcmd, (char *) NULL);
233	fatal("execl failed");
234}
235
236int
237main(int argc, char **argv)
238{
239	struct passwd	*pw;
240	char		*s, *path, *label, *home, **var;
241	int	 	 opt, flags, quiet, keys;
242
243#ifdef DEBUG
244	malloc_options = (char *) "AFGJPX";
245#endif
246
247	setlocale(LC_TIME, "");
248
249	quiet = flags = 0;
250	label = path = NULL;
251	login_shell = (**argv == '-');
252	while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUv")) != -1) {
253		switch (opt) {
254		case '2':
255			flags |= IDENTIFY_256COLOURS;
256			break;
257		case 'c':
258			free(shell_cmd);
259			shell_cmd = xstrdup(optarg);
260			break;
261		case 'C':
262			if (flags & IDENTIFY_CONTROL)
263				flags |= IDENTIFY_TERMIOS;
264			else
265				flags |= IDENTIFY_CONTROL;
266			break;
267		case 'f':
268			free(cfg_file);
269			cfg_file = xstrdup(optarg);
270			break;
271		case 'l':
272			login_shell = 1;
273			break;
274		case 'L':
275			free(label);
276			label = xstrdup(optarg);
277			break;
278		case 'q':
279			quiet = 1;
280			break;
281		case 'S':
282			free(path);
283			path = xstrdup(optarg);
284			break;
285		case 'u':
286			flags |= IDENTIFY_UTF8;
287			break;
288		case 'v':
289			debug_level++;
290			break;
291		default:
292			usage();
293		}
294	}
295	argc -= optind;
296	argv += optind;
297
298	if (shell_cmd != NULL && argc != 0)
299		usage();
300
301	if (!(flags & IDENTIFY_UTF8)) {
302		/*
303		 * If the user has set whichever of LC_ALL, LC_CTYPE or LANG
304		 * exist (in that order) to contain UTF-8, it is a safe
305		 * assumption that either they are using a UTF-8 terminal, or
306		 * if not they know that output from UTF-8-capable programs may
307		 * be wrong.
308		 */
309		if ((s = getenv("LC_ALL")) == NULL || *s == '\0') {
310			if ((s = getenv("LC_CTYPE")) == NULL || *s == '\0')
311				s = getenv("LANG");
312		}
313		if (s != NULL && (strcasestr(s, "UTF-8") != NULL ||
314		    strcasestr(s, "UTF8") != NULL))
315			flags |= IDENTIFY_UTF8;
316	}
317
318	environ_init(&global_environ);
319	for (var = environ; *var != NULL; var++)
320		environ_put(&global_environ, *var);
321
322	options_init(&global_options, NULL);
323	options_table_populate_tree(server_options_table, &global_options);
324	options_set_number(&global_options, "quiet", quiet);
325
326	options_init(&global_s_options, NULL);
327	options_table_populate_tree(session_options_table, &global_s_options);
328	options_set_string(&global_s_options, "default-shell", "%s", getshell());
329
330	options_init(&global_w_options, NULL);
331	options_table_populate_tree(window_options_table, &global_w_options);
332
333	/* Enable UTF-8 if the first client is on UTF-8 terminal. */
334	if (flags & IDENTIFY_UTF8) {
335		options_set_number(&global_s_options, "status-utf8", 1);
336		options_set_number(&global_s_options, "mouse-utf8", 1);
337		options_set_number(&global_w_options, "utf8", 1);
338	}
339
340	/* Override keys to vi if VISUAL or EDITOR are set. */
341	if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) {
342		if (strrchr(s, '/') != NULL)
343			s = strrchr(s, '/') + 1;
344		if (strstr(s, "vi") != NULL)
345			keys = MODEKEY_VI;
346		else
347			keys = MODEKEY_EMACS;
348		options_set_number(&global_s_options, "status-keys", keys);
349		options_set_number(&global_w_options, "mode-keys", keys);
350	}
351
352	/* Locate the configuration file. */
353	if (cfg_file == NULL) {
354		home = getenv("HOME");
355		if (home == NULL || *home == '\0') {
356			pw = getpwuid(getuid());
357			if (pw != NULL)
358				home = pw->pw_dir;
359		}
360		xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG);
361		if (access(cfg_file, R_OK) != 0 && errno == ENOENT) {
362			free(cfg_file);
363			cfg_file = NULL;
364		}
365	}
366
367	/*
368	 * Figure out the socket path. If specified on the command-line with -S
369	 * or -L, use it, otherwise try $TMUX or assume -L default.
370	 */
371	parseenvironment();
372	if (path == NULL) {
373		/* If no -L, use the environment. */
374		if (label == NULL) {
375			if (environ_path != NULL)
376				path = xstrdup(environ_path);
377			else
378				label = xstrdup("default");
379		}
380
381		/* -L or default set. */
382		if (label != NULL) {
383			if ((path = makesocketpath(label)) == NULL) {
384				fprintf(stderr, "can't create socket\n");
385				exit(1);
386			}
387		}
388	}
389	free(label);
390	strlcpy(socket_path, path, sizeof socket_path);
391	free(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