1 /* $OpenBSD$ */
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 <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 struct options *global_options; /* server options */
38 struct options *global_s_options; /* session options */
39 struct options *global_w_options; /* window options */
40 struct environ *global_environ;
41 struct hooks *global_hooks;
42
43 struct timeval start_time;
44 const char *socket_path;
45
46 __dead void usage(void);
47 static char *make_label(const char *);
48
49 __dead void
usage(void)50 usage(void)
51 {
52 fprintf(stderr,
53 "usage: %s [-2CluvV] [-c shell-command] [-f file] [-L socket-name]\n"
54 " [-S socket-path] [command [flags]]\n",
55 getprogname());
56 exit(1);
57 }
58
59 const char *
getshell(void)60 getshell(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
76 int
checkshell(const char * shell)77 checkshell(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
88 int
areshell(const char * shell)89 areshell(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 = getprogname();
98 if (*progname == '-')
99 progname++;
100 if (strcmp(ptr, progname) == 0)
101 return (1);
102 return (0);
103 }
104
105 static char *
make_label(const char * label)106 make_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
142 fail:
143 saved_errno = errno;
144 free(base);
145 errno = saved_errno;
146 return (NULL);
147 }
148
149 void
setblocking(int fd,int state)150 setblocking(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
163 const char *
find_home(void)164 find_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
184 int
main(int argc,char ** argv)185 main(int argc, char **argv)
186 {
187 char *path, *label, **var, tmp[PATH_MAX], *shellcmd = NULL;
188 const char *s;
189 int opt, flags, keys;
190
191 if (setlocale(LC_CTYPE, "en_US.UTF-8") == NULL) {
192 if (setlocale(LC_CTYPE, "") == NULL)
193 errx(1, "invalid LC_ALL, LC_CTYPE or LANG");
194 s = nl_langinfo(CODESET);
195 if (strcasecmp(s, "UTF-8") != 0 && strcasecmp(s, "UTF8") != 0)
196 errx(1, "need UTF-8 locale (LC_CTYPE) but have %s", s);
197 }
198
199 setlocale(LC_TIME, "");
200 tzset();
201
202 if (**argv == '-')
203 flags = CLIENT_LOGIN;
204 else
205 flags = 0;
206
207 label = path = NULL;
208 while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUVv")) != -1) {
209 switch (opt) {
210 case '2':
211 flags |= CLIENT_256COLOURS;
212 break;
213 case 'c':
214 free(shellcmd);
215 shellcmd = xstrdup(optarg);
216 break;
217 case 'C':
218 if (flags & CLIENT_CONTROL)
219 flags |= CLIENT_CONTROLCONTROL;
220 else
221 flags |= CLIENT_CONTROL;
222 break;
223 case 'V':
224 printf("%s %s\n", getprogname(), VERSION);
225 exit(0);
226 case 'f':
227 set_cfg_file(optarg);
228 break;
229 case 'l':
230 flags |= CLIENT_LOGIN;
231 break;
232 case 'L':
233 free(label);
234 label = xstrdup(optarg);
235 break;
236 case 'q':
237 break;
238 case 'S':
239 free(path);
240 path = xstrdup(optarg);
241 break;
242 case 'u':
243 flags |= CLIENT_UTF8;
244 break;
245 case 'v':
246 log_add_level();
247 break;
248 default:
249 usage();
250 }
251 }
252 argc -= optind;
253 argv += optind;
254
255 if (shellcmd != NULL && argc != 0)
256 usage();
257
258 #ifdef __OpenBSD__
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 #endif
263
264 /*
265 * tmux is a UTF-8 terminal, so if TMUX is set, assume UTF-8.
266 * Otherwise, if the user has set LC_ALL, LC_CTYPE or LANG to contain
267 * UTF-8, it is a safe assumption that either they are using a UTF-8
268 * terminal, or if not they know that output from UTF-8-capable
269 * programs may be wrong.
270 */
271 if (getenv("TMUX") != NULL)
272 flags |= CLIENT_UTF8;
273 else {
274 s = getenv("LC_ALL");
275 if (s == NULL || *s == '\0')
276 s = getenv("LC_CTYPE");
277 if (s == NULL || *s == '\0')
278 s = getenv("LANG");
279 if (s == NULL || *s == '\0')
280 s = "";
281 if (strcasestr(s, "UTF-8") != NULL ||
282 strcasestr(s, "UTF8") != NULL)
283 flags |= CLIENT_UTF8;
284 }
285
286 global_hooks = hooks_create(NULL);
287
288 global_environ = environ_create();
289 for (var = environ; *var != NULL; var++)
290 environ_put(global_environ, *var);
291 if (getcwd(tmp, sizeof tmp) != NULL)
292 environ_set(global_environ, "PWD", "%s", tmp);
293
294 global_options = options_create(NULL);
295 options_table_populate_tree(OPTIONS_TABLE_SERVER, global_options);
296
297 global_s_options = options_create(NULL);
298 options_table_populate_tree(OPTIONS_TABLE_SESSION, global_s_options);
299 options_set_string(global_s_options, "default-shell", "%s", getshell());
300
301 global_w_options = options_create(NULL);
302 options_table_populate_tree(OPTIONS_TABLE_WINDOW, global_w_options);
303
304 /* Override keys to vi if VISUAL or EDITOR are set. */
305 if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) {
306 if (strrchr(s, '/') != NULL)
307 s = strrchr(s, '/') + 1;
308 if (strstr(s, "vi") != NULL)
309 keys = MODEKEY_VI;
310 else
311 keys = MODEKEY_EMACS;
312 options_set_number(global_s_options, "status-keys", keys);
313 options_set_number(global_w_options, "mode-keys", keys);
314 }
315
316 /*
317 * If socket is specified on the command-line with -S or -L, it is
318 * used. Otherwise, $TMUX is checked and if that fails "default" is
319 * used.
320 */
321 if (path == NULL && label == NULL) {
322 s = getenv("TMUX");
323 if (s != NULL && *s != '\0' && *s != ',') {
324 path = xstrdup(s);
325 path[strcspn (path, ",")] = '\0';
326 }
327 }
328 if (path == NULL && (path = make_label(label)) == NULL) {
329 fprintf(stderr, "can't create socket: %s\n", strerror(errno));
330 exit(1);
331 }
332 socket_path = path;
333 free(label);
334
335 /* Pass control to the client. */
336 exit(client_main(osdep_event_init(), argc, argv, flags, shellcmd));
337 }
338