1/* $Id: tmux.c,v 1.1.1.2 2011/08/17 18:40:05 jmmv 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 <pwd.h>
26#include <stdlib.h>
27#include <string.h>
28#include <unistd.h>
29
30#include "tmux.h"
31
32#if defined(DEBUG) && defined(__OpenBSD__)
33extern char	*malloc_options;
34#endif
35
36struct options	 global_options;	/* server options */
37struct options	 global_s_options;	/* session options */
38struct options	 global_w_options;	/* window options */
39struct environ	 global_environ;
40
41struct event_base *ev_base;
42
43char		*cfg_file;
44char		*shell_cmd;
45int		 debug_level;
46time_t		 start_time;
47char		 socket_path[MAXPATHLEN];
48int		 login_shell;
49char		*environ_path;
50pid_t		 environ_pid = -1;
51int		 environ_idx = -1;
52
53__dead void	 usage(void);
54void	 	 parseenvironment(void);
55char 		*makesocketpath(const char *);
56
57#ifndef HAVE___PROGNAME
58char      *__progname = (char *) "tmux";
59#endif
60
61__dead void
62usage(void)
63{
64	fprintf(stderr,
65	    "usage: %s [-28lquvV] [-c shell-command] [-f file] [-L socket-name]\n"
66	    "            [-S socket-path] [command [flags]]\n",
67	    __progname);
68	exit(1);
69}
70
71void
72logfile(const char *name)
73{
74	char	*path;
75
76	log_close();
77	if (debug_level > 0) {
78		xasprintf(&path, "tmux-%s-%ld.log", name, (long) getpid());
79		log_open_file(debug_level, path);
80		xfree(path);
81	}
82}
83
84const char *
85getshell(void)
86{
87	struct passwd	*pw;
88	const char	*shell;
89
90	shell = getenv("SHELL");
91	if (checkshell(shell))
92		return (shell);
93
94	pw = getpwuid(getuid());
95	if (pw != NULL && checkshell(pw->pw_shell))
96		return (pw->pw_shell);
97
98	return (_PATH_BSHELL);
99}
100
101int
102checkshell(const char *shell)
103{
104	if (shell == NULL || *shell == '\0' || areshell(shell))
105		return (0);
106	if (access(shell, X_OK) != 0)
107		return (0);
108	return (1);
109}
110
111int
112areshell(const char *shell)
113{
114	const char	*progname, *ptr;
115
116	if ((ptr = strrchr(shell, '/')) != NULL)
117		ptr++;
118	else
119		ptr = shell;
120	progname = __progname;
121	if (*progname == '-')
122		progname++;
123	if (strcmp(ptr, progname) == 0)
124		return (1);
125	return (0);
126}
127
128void
129parseenvironment(void)
130{
131	char	*env, path[256];
132	long	 pid;
133	int	 idx;
134
135	if ((env = getenv("TMUX")) == NULL)
136		return;
137
138	if (sscanf(env, "%255[^,],%ld,%d", path, &pid, &idx) != 3)
139		return;
140	environ_path = xstrdup(path);
141	environ_pid = pid;
142	environ_idx = idx;
143}
144
145char *
146makesocketpath(const char *label)
147{
148	char		base[MAXPATHLEN], *path, *s;
149	struct stat	sb;
150	u_int		uid;
151
152	uid = getuid();
153	if ((s = getenv("TMPDIR")) == NULL || *s == '\0')
154		xsnprintf(base, sizeof base, "%s/tmux-%u", _PATH_TMP, uid);
155	else
156		xsnprintf(base, sizeof base, "%s/tmux-%u", s, uid);
157
158	if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST)
159		return (NULL);
160
161	if (lstat(base, &sb) != 0)
162		return (NULL);
163	if (!S_ISDIR(sb.st_mode)) {
164		errno = ENOTDIR;
165		return (NULL);
166	}
167	if (sb.st_uid != uid || (sb.st_mode & (S_IRWXG|S_IRWXO)) != 0) {
168		errno = EACCES;
169		return (NULL);
170	}
171
172	xasprintf(&path, "%s/%s", base, label);
173	return (path);
174}
175
176void
177setblocking(int fd, int state)
178{
179	int mode;
180
181	if ((mode = fcntl(fd, F_GETFL)) != -1) {
182		if (!state)
183			mode |= O_NONBLOCK;
184		else
185			mode &= ~O_NONBLOCK;
186		fcntl(fd, F_SETFL, mode);
187	}
188}
189
190__dead void
191shell_exec(const char *shell, const char *shellcmd)
192{
193	const char	*shellname, *ptr;
194	char		*argv0;
195
196	ptr = strrchr(shell, '/');
197	if (ptr != NULL && *(ptr + 1) != '\0')
198		shellname = ptr + 1;
199	else
200		shellname = shell;
201	if (login_shell)
202		xasprintf(&argv0, "-%s", shellname);
203	else
204		xasprintf(&argv0, "%s", shellname);
205	setenv("SHELL", shell, 1);
206
207	setblocking(STDIN_FILENO, 1);
208	setblocking(STDOUT_FILENO, 1);
209	setblocking(STDERR_FILENO, 1);
210	closefrom(STDERR_FILENO + 1);
211
212	execl(shell, argv0, "-c", shellcmd, (char *) NULL);
213	fatal("execl failed");
214}
215
216int
217main(int argc, char **argv)
218{
219	struct passwd	*pw;
220	struct keylist	*keylist;
221	char		*s, *path, *label, *home, **var;
222	int	 	 opt, flags, quiet, keys;
223
224#if defined(DEBUG) && defined(__OpenBSD__)
225	malloc_options = (char *) "AFGJPX";
226#endif
227
228	quiet = flags = 0;
229	label = path = NULL;
230	login_shell = (**argv == '-');
231	while ((opt = getopt(argc, argv, "28c:df:lL:qS:uUvV")) != -1) {
232		switch (opt) {
233		case '2':
234			flags |= IDENTIFY_256COLOURS;
235			flags &= ~IDENTIFY_88COLOURS;
236			break;
237		case '8':
238			flags |= IDENTIFY_88COLOURS;
239			flags &= ~IDENTIFY_256COLOURS;
240			break;
241		case 'c':
242			if (shell_cmd != NULL)
243				xfree(shell_cmd);
244			shell_cmd = xstrdup(optarg);
245			break;
246		case 'V':
247			printf("%s %s\n", __progname, VERSION);
248			exit(0);
249		case 'f':
250			if (cfg_file != NULL)
251				xfree(cfg_file);
252			cfg_file = xstrdup(optarg);
253			break;
254		case 'l':
255			login_shell = 1;
256			break;
257		case 'L':
258			if (label != NULL)
259				xfree(label);
260			label = xstrdup(optarg);
261			break;
262		case 'q':
263			quiet = 1;
264			break;
265		case 'S':
266			if (path != NULL)
267				xfree(path);
268			path = xstrdup(optarg);
269			break;
270		case 'u':
271			flags |= IDENTIFY_UTF8;
272			break;
273		case 'v':
274			debug_level++;
275			break;
276		default:
277			usage();
278		}
279	}
280	argc -= optind;
281	argv += optind;
282
283	if (shell_cmd != NULL && argc != 0)
284		usage();
285
286	log_open_tty(debug_level);
287
288	if (!(flags & IDENTIFY_UTF8)) {
289		/*
290		 * If the user has set whichever of LC_ALL, LC_CTYPE or LANG
291		 * exist (in that order) to contain UTF-8, it is a safe
292		 * assumption that either they are using a UTF-8 terminal, or
293		 * if not they know that output from UTF-8-capable programs may
294		 * be wrong.
295		 */
296		if ((s = getenv("LC_ALL")) == NULL) {
297			if ((s = getenv("LC_CTYPE")) == NULL)
298				s = getenv("LANG");
299		}
300		if (s != NULL && (strcasestr(s, "UTF-8") != NULL ||
301		    strcasestr(s, "UTF8") != NULL))
302			flags |= IDENTIFY_UTF8;
303	}
304
305	environ_init(&global_environ);
306	for (var = environ; *var != NULL; var++)
307		environ_put(&global_environ, *var);
308
309	options_init(&global_options, NULL);
310	options_table_populate_tree(server_options_table, &global_options);
311	options_set_number(&global_options, "quiet", quiet);
312
313	options_init(&global_s_options, NULL);
314	options_table_populate_tree(session_options_table, &global_s_options);
315	options_set_string(&global_s_options, "default-shell", "%s", getshell());
316
317	options_init(&global_w_options, NULL);
318	options_table_populate_tree(window_options_table, &global_w_options);
319
320	/* Set the prefix option (its a list, so not in the table). */
321	keylist = xmalloc(sizeof *keylist);
322	ARRAY_INIT(keylist);
323	ARRAY_ADD(keylist, '\002');
324	options_set_data(&global_s_options, "prefix", keylist, xfree);
325
326	/* Enable UTF-8 if the first client is on UTF-8 terminal. */
327	if (flags & IDENTIFY_UTF8) {
328		options_set_number(&global_s_options, "status-utf8", 1);
329		options_set_number(&global_s_options, "mouse-utf8", 1);
330		options_set_number(&global_w_options, "utf8", 1);
331	}
332
333	/* Override keys to vi if VISUAL or EDITOR are set. */
334	if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) {
335		if (strrchr(s, '/') != NULL)
336			s = strrchr(s, '/') + 1;
337		if (strstr(s, "vi") != NULL)
338			keys = MODEKEY_VI;
339		else
340			keys = MODEKEY_EMACS;
341		options_set_number(&global_s_options, "status-keys", keys);
342		options_set_number(&global_w_options, "mode-keys", keys);
343	}
344
345	/* Locate the configuration file. */
346	if (cfg_file == NULL) {
347		home = getenv("HOME");
348		if (home == NULL || *home == '\0') {
349			pw = getpwuid(getuid());
350			if (pw != NULL)
351				home = pw->pw_dir;
352		}
353		xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG);
354		if (access(cfg_file, R_OK) != 0 && errno == ENOENT) {
355			xfree(cfg_file);
356			cfg_file = NULL;
357		}
358	}
359
360	/*
361	 * Figure out the socket path. If specified on the command-line with -S
362	 * or -L, use it, otherwise try $TMUX or assume -L default.
363	 */
364	parseenvironment();
365	if (path == NULL) {
366		/* If no -L, use the environment. */
367		if (label == NULL) {
368			if (environ_path != NULL)
369				path = xstrdup(environ_path);
370			else
371				label = xstrdup("default");
372		}
373
374		/* -L or default set. */
375		if (label != NULL) {
376			if ((path = makesocketpath(label)) == NULL) {
377				log_warn("can't create socket");
378				exit(1);
379			}
380		}
381	}
382	if (label != NULL)
383		xfree(label);
384	if (realpath(path, socket_path) == NULL)
385		strlcpy(socket_path, path, sizeof socket_path);
386	xfree(path);
387
388#ifdef HAVE_SETPROCTITLE
389	/* Set process title. */
390	setproctitle("%s (%s)", __progname, socket_path);
391#endif
392
393	/* Pass control to the client. */
394	ev_base = osdep_event_init();
395	exit(client_main(argc, argv, flags));
396}
397