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 #include <sys/utsname.h>
22
23 #include <errno.h>
24 #include <fcntl.h>
25 #include <langinfo.h>
26 #include <locale.h>
27 #include <pwd.h>
28 #include <signal.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <time.h>
32 #include <unistd.h>
33
34 #include "tmux.h"
35
36 struct options *global_options; /* server options */
37 struct options *global_s_options; /* session options */
38 struct options *global_w_options; /* window options */
39 struct environ *global_environ;
40
41 struct timeval start_time;
42 const char *socket_path;
43 int ptm_fd = -1;
44 const char *shell_command;
45
46 static __dead void usage(void);
47 static char *make_label(const char *, char **);
48
49 static int areshell(const char *);
50 static const char *getshell(void);
51
52 static __dead void
usage(void)53 usage(void)
54 {
55 fprintf(stderr,
56 "usage: %s [-2CDlNuvV] [-c shell-command] [-f file] [-L socket-name]\n"
57 " [-S socket-path] [-T features] [command [flags]]\n",
58 getprogname());
59 exit(1);
60 }
61
62 static const char *
getshell(void)63 getshell(void)
64 {
65 struct passwd *pw;
66 const char *shell;
67
68 shell = getenv("SHELL");
69 if (checkshell(shell))
70 return (shell);
71
72 pw = getpwuid(getuid());
73 if (pw != NULL && checkshell(pw->pw_shell))
74 return (pw->pw_shell);
75
76 return (_PATH_BSHELL);
77 }
78
79 int
checkshell(const char * shell)80 checkshell(const char *shell)
81 {
82 if (shell == NULL || *shell != '/')
83 return (0);
84 if (areshell(shell))
85 return (0);
86 if (access(shell, X_OK) != 0)
87 return (0);
88 return (1);
89 }
90
91 static int
areshell(const char * shell)92 areshell(const char *shell)
93 {
94 const char *progname, *ptr;
95
96 if ((ptr = strrchr(shell, '/')) != NULL)
97 ptr++;
98 else
99 ptr = shell;
100 progname = getprogname();
101 if (*progname == '-')
102 progname++;
103 if (strcmp(ptr, progname) == 0)
104 return (1);
105 return (0);
106 }
107
108 static char *
expand_path(const char * path,const char * home)109 expand_path(const char *path, const char *home)
110 {
111 char *expanded, *name;
112 const char *end;
113 struct environ_entry *value;
114
115 if (strncmp(path, "~/", 2) == 0) {
116 if (home == NULL)
117 return (NULL);
118 xasprintf(&expanded, "%s%s", home, path + 1);
119 return (expanded);
120 }
121
122 if (*path == '$') {
123 end = strchr(path, '/');
124 if (end == NULL)
125 name = xstrdup(path + 1);
126 else
127 name = xstrndup(path + 1, end - path - 1);
128 value = environ_find(global_environ, name);
129 free(name);
130 if (value == NULL)
131 return (NULL);
132 if (end == NULL)
133 end = "";
134 xasprintf(&expanded, "%s%s", value->value, end);
135 return (expanded);
136 }
137
138 return (xstrdup(path));
139 }
140
141 static void
expand_paths(const char * s,char *** paths,u_int * n,int ignore_errors)142 expand_paths(const char *s, char ***paths, u_int *n, int ignore_errors)
143 {
144 const char *home = find_home();
145 char *copy, *next, *tmp, resolved[PATH_MAX], *expanded;
146 char *path;
147 u_int i;
148
149 *paths = NULL;
150 *n = 0;
151
152 copy = tmp = xstrdup(s);
153 while ((next = strsep(&tmp, ":")) != NULL) {
154 expanded = expand_path(next, home);
155 if (expanded == NULL) {
156 log_debug("%s: invalid path: %s", __func__, next);
157 continue;
158 }
159 if (realpath(expanded, resolved) == NULL) {
160 log_debug("%s: realpath(\"%s\") failed: %s", __func__,
161 expanded, strerror(errno));
162 if (ignore_errors) {
163 free(expanded);
164 continue;
165 }
166 path = expanded;
167 } else {
168 path = xstrdup(resolved);
169 free(expanded);
170 }
171 for (i = 0; i < *n; i++) {
172 if (strcmp(path, (*paths)[i]) == 0)
173 break;
174 }
175 if (i != *n) {
176 log_debug("%s: duplicate path: %s", __func__, path);
177 free(path);
178 continue;
179 }
180 *paths = xreallocarray(*paths, (*n) + 1, sizeof *paths);
181 (*paths)[(*n)++] = path;
182 }
183 free(copy);
184 }
185
186 static char *
make_label(const char * label,char ** cause)187 make_label(const char *label, char **cause)
188 {
189 char **paths, *path, *base;
190 u_int i, n;
191 struct stat sb;
192 uid_t uid;
193
194 *cause = NULL;
195 if (label == NULL)
196 label = "default";
197 uid = getuid();
198
199 expand_paths(TMUX_SOCK, &paths, &n, 1);
200 if (n == 0) {
201 xasprintf(cause, "no suitable socket path");
202 return (NULL);
203 }
204 path = paths[0]; /* can only have one socket! */
205 for (i = 1; i < n; i++)
206 free(paths[i]);
207 free(paths);
208
209 xasprintf(&base, "%s/tmux-%ld", path, (long)uid);
210 if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST)
211 goto fail;
212 if (lstat(base, &sb) != 0)
213 goto fail;
214 if (!S_ISDIR(sb.st_mode)) {
215 errno = ENOTDIR;
216 goto fail;
217 }
218 if (sb.st_uid != uid || (sb.st_mode & S_IRWXO) != 0) {
219 errno = EACCES;
220 goto fail;
221 }
222 xasprintf(&path, "%s/%s", base, label);
223 free(base);
224 return (path);
225
226 fail:
227 xasprintf(cause, "error creating %s (%s)", base, strerror(errno));
228 free(base);
229 return (NULL);
230 }
231
232 void
setblocking(int fd,int state)233 setblocking(int fd, int state)
234 {
235 int mode;
236
237 if ((mode = fcntl(fd, F_GETFL)) != -1) {
238 if (!state)
239 mode |= O_NONBLOCK;
240 else
241 mode &= ~O_NONBLOCK;
242 fcntl(fd, F_SETFL, mode);
243 }
244 }
245
246 uint64_t
get_timer(void)247 get_timer(void)
248 {
249 struct timespec ts;
250
251 /*
252 * We want a timestamp in milliseconds suitable for time measurement,
253 * so prefer the monotonic clock.
254 */
255 if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0)
256 clock_gettime(CLOCK_REALTIME, &ts);
257 return ((ts.tv_sec * 1000ULL) + (ts.tv_nsec / 1000000ULL));
258 }
259
260 const char *
sig2name(int signo)261 sig2name(int signo)
262 {
263 static char s[11];
264
265 #ifdef HAVE_SYS_SIGNAME
266 if (signo > 0 && signo < NSIG)
267 return (sys_signame[signo]);
268 #endif
269 xsnprintf(s, sizeof s, "%d", signo);
270 return (s);
271 }
272
273 const char *
find_cwd(void)274 find_cwd(void)
275 {
276 char resolved1[PATH_MAX], resolved2[PATH_MAX];
277 static char cwd[PATH_MAX];
278 const char *pwd;
279
280 if (getcwd(cwd, sizeof cwd) == NULL)
281 return (NULL);
282 if ((pwd = getenv("PWD")) == NULL || *pwd == '\0')
283 return (cwd);
284
285 /*
286 * We want to use PWD so that symbolic links are maintained,
287 * but only if it matches the actual working directory.
288 */
289 if (realpath(pwd, resolved1) == NULL)
290 return (cwd);
291 if (realpath(cwd, resolved2) == NULL)
292 return (cwd);
293 if (strcmp(resolved1, resolved2) != 0)
294 return (cwd);
295 return (pwd);
296 }
297
298 const char *
find_home(void)299 find_home(void)
300 {
301 struct passwd *pw;
302 static const char *home;
303
304 if (home != NULL)
305 return (home);
306
307 home = getenv("HOME");
308 if (home == NULL || *home == '\0') {
309 pw = getpwuid(getuid());
310 if (pw != NULL)
311 home = pw->pw_dir;
312 else
313 home = NULL;
314 }
315
316 return (home);
317 }
318
319 const char *
getversion(void)320 getversion(void)
321 {
322 return TMUX_VERSION;
323 }
324
325 int
main(int argc,char ** argv)326 main(int argc, char **argv)
327 {
328 char *path = NULL, *label = NULL;
329 char *cause, **var;
330 const char *s, *cwd;
331 int opt, keys, feat = 0, fflag = 0;
332 uint64_t flags = 0;
333 const struct options_table_entry *oe;
334 u_int i;
335
336 if (setlocale(LC_CTYPE, "en_US.UTF-8") == NULL &&
337 setlocale(LC_CTYPE, "C.UTF-8") == NULL) {
338 if (setlocale(LC_CTYPE, "") == NULL)
339 errx(1, "invalid LC_ALL, LC_CTYPE or LANG");
340 s = nl_langinfo(CODESET);
341 if (strcasecmp(s, "UTF-8") != 0 && strcasecmp(s, "UTF8") != 0)
342 errx(1, "need UTF-8 locale (LC_CTYPE) but have %s", s);
343 }
344
345 setlocale(LC_TIME, "");
346 tzset();
347
348 if (**argv == '-')
349 flags = CLIENT_LOGIN;
350
351 global_environ = environ_create();
352 for (var = environ; *var != NULL; var++)
353 environ_put(global_environ, *var, 0);
354 if ((cwd = find_cwd()) != NULL)
355 environ_set(global_environ, "PWD", 0, "%s", cwd);
356 expand_paths(TMUX_CONF, &cfg_files, &cfg_nfiles, 1);
357
358 while ((opt = getopt(argc, argv, "2c:CDdf:lL:NqS:T:uUvV")) != -1) {
359 switch (opt) {
360 case '2':
361 tty_add_features(&feat, "256", ":,");
362 break;
363 case 'c':
364 shell_command = optarg;
365 break;
366 case 'D':
367 flags |= CLIENT_NOFORK;
368 break;
369 case 'C':
370 if (flags & CLIENT_CONTROL)
371 flags |= CLIENT_CONTROLCONTROL;
372 else
373 flags |= CLIENT_CONTROL;
374 break;
375 case 'f':
376 if (!fflag) {
377 fflag = 1;
378 for (i = 0; i < cfg_nfiles; i++)
379 free(cfg_files[i]);
380 cfg_nfiles = 0;
381 }
382 cfg_files = xreallocarray(cfg_files, cfg_nfiles + 1,
383 sizeof *cfg_files);
384 cfg_files[cfg_nfiles++] = xstrdup(optarg);
385 cfg_quiet = 0;
386 break;
387 case 'V':
388 printf("%s %s\n", getprogname(), getversion());
389 exit(0);
390 case 'l':
391 flags |= CLIENT_LOGIN;
392 break;
393 case 'L':
394 free(label);
395 label = xstrdup(optarg);
396 break;
397 case 'N':
398 flags |= CLIENT_NOSTARTSERVER;
399 break;
400 case 'q':
401 break;
402 case 'S':
403 free(path);
404 path = xstrdup(optarg);
405 break;
406 case 'T':
407 tty_add_features(&feat, optarg, ":,");
408 break;
409 case 'u':
410 flags |= CLIENT_UTF8;
411 break;
412 case 'v':
413 log_add_level();
414 break;
415 default:
416 usage();
417 }
418 }
419 argc -= optind;
420 argv += optind;
421
422 if (shell_command != NULL && argc != 0)
423 usage();
424 if ((flags & CLIENT_NOFORK) && argc != 0)
425 usage();
426
427 if ((ptm_fd = getptmfd()) == -1)
428 err(1, "getptmfd");
429 if (pledge("stdio rpath wpath cpath flock fattr unix getpw sendfd "
430 "recvfd proc exec tty ps", NULL) != 0)
431 err(1, "pledge");
432
433 /*
434 * tmux is a UTF-8 terminal, so if TMUX is set, assume UTF-8.
435 * Otherwise, if the user has set LC_ALL, LC_CTYPE or LANG to contain
436 * UTF-8, it is a safe assumption that either they are using a UTF-8
437 * terminal, or if not they know that output from UTF-8-capable
438 * programs may be wrong.
439 */
440 if (getenv("TMUX") != NULL)
441 flags |= CLIENT_UTF8;
442 else {
443 s = getenv("LC_ALL");
444 if (s == NULL || *s == '\0')
445 s = getenv("LC_CTYPE");
446 if (s == NULL || *s == '\0')
447 s = getenv("LANG");
448 if (s == NULL || *s == '\0')
449 s = "";
450 if (strcasestr(s, "UTF-8") != NULL ||
451 strcasestr(s, "UTF8") != NULL)
452 flags |= CLIENT_UTF8;
453 }
454
455 global_options = options_create(NULL);
456 global_s_options = options_create(NULL);
457 global_w_options = options_create(NULL);
458 for (oe = options_table; oe->name != NULL; oe++) {
459 if (oe->scope & OPTIONS_TABLE_SERVER)
460 options_default(global_options, oe);
461 if (oe->scope & OPTIONS_TABLE_SESSION)
462 options_default(global_s_options, oe);
463 if (oe->scope & OPTIONS_TABLE_WINDOW)
464 options_default(global_w_options, oe);
465 }
466
467 /*
468 * The default shell comes from SHELL or from the user's passwd entry
469 * if available.
470 */
471 options_set_string(global_s_options, "default-shell", 0, "%s",
472 getshell());
473
474 /* Override keys to vi if VISUAL or EDITOR are set. */
475 if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) {
476 options_set_string(global_options, "editor", 0, "%s", s);
477 if (strrchr(s, '/') != NULL)
478 s = strrchr(s, '/') + 1;
479 if (strstr(s, "vi") != NULL)
480 keys = MODEKEY_VI;
481 else
482 keys = MODEKEY_EMACS;
483 options_set_number(global_s_options, "status-keys", keys);
484 options_set_number(global_w_options, "mode-keys", keys);
485 }
486
487 /*
488 * If socket is specified on the command-line with -S or -L, it is
489 * used. Otherwise, $TMUX is checked and if that fails "default" is
490 * used.
491 */
492 if (path == NULL && label == NULL) {
493 s = getenv("TMUX");
494 if (s != NULL && *s != '\0' && *s != ',') {
495 path = xstrdup(s);
496 path[strcspn(path, ",")] = '\0';
497 }
498 }
499 if (path == NULL) {
500 if ((path = make_label(label, &cause)) == NULL) {
501 if (cause != NULL) {
502 fprintf(stderr, "%s\n", cause);
503 free(cause);
504 }
505 exit(1);
506 }
507 flags |= CLIENT_DEFAULTSOCKET;
508 }
509 socket_path = path;
510 free(label);
511
512 /* Pass control to the client. */
513 exit(client_main(osdep_event_init(), argc, argv, flags, feat));
514 }
515