tmux.c revision 1.15.2.1
1 /* $OpenBSD$ */ 2 3 /* 4 * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott (at) 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 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 * 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 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 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 * 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 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 * 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 free(path); 211 if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST) { 212 xasprintf(cause, "couldn't create directory %s (%s)", base, 213 strerror(errno)); 214 goto fail; 215 } 216 if (lstat(base, &sb) != 0) { 217 xasprintf(cause, "couldn't read directory %s (%s)", base, 218 strerror(errno)); 219 goto fail; 220 } 221 if (!S_ISDIR(sb.st_mode)) { 222 xasprintf(cause, "%s is not a directory", base); 223 goto fail; 224 } 225 if (sb.st_uid != uid || (sb.st_mode & S_IRWXO) != 0) { 226 xasprintf(cause, "directory %s has unsafe permissions", base); 227 goto fail; 228 } 229 xasprintf(&path, "%s/%s", base, label); 230 free(base); 231 return (path); 232 233 fail: 234 free(base); 235 return (NULL); 236 } 237 238 char * 239 shell_argv0(const char *shell, int is_login) 240 { 241 const char *slash, *name; 242 char *argv0; 243 244 slash = strrchr(shell, '/'); 245 if (slash != NULL && slash[1] != '\0') 246 name = slash + 1; 247 else 248 name = shell; 249 if (is_login) 250 xasprintf(&argv0, "-%s", name); 251 else 252 xasprintf(&argv0, "%s", name); 253 return (argv0); 254 } 255 256 void 257 setblocking(int fd, int state) 258 { 259 int mode; 260 261 if ((mode = fcntl(fd, F_GETFL)) != -1) { 262 if (!state) 263 mode |= O_NONBLOCK; 264 else 265 mode &= ~O_NONBLOCK; 266 fcntl(fd, F_SETFL, mode); 267 } 268 } 269 270 uint64_t 271 get_timer(void) 272 { 273 struct timespec ts; 274 275 /* 276 * We want a timestamp in milliseconds suitable for time measurement, 277 * so prefer the monotonic clock. 278 */ 279 if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0) 280 clock_gettime(CLOCK_REALTIME, &ts); 281 return ((ts.tv_sec * 1000ULL) + (ts.tv_nsec / 1000000ULL)); 282 } 283 284 const char * 285 sig2name(int signo) 286 { 287 static char s[11]; 288 289 #ifdef HAVE_SYS_SIGNAME 290 if (signo > 0 && signo < NSIG) 291 return (sys_signame[signo]); 292 #endif 293 xsnprintf(s, sizeof s, "%d", signo); 294 return (s); 295 } 296 297 const char * 298 find_cwd(void) 299 { 300 char resolved1[PATH_MAX], resolved2[PATH_MAX]; 301 static char cwd[PATH_MAX]; 302 const char *pwd; 303 304 if (getcwd(cwd, sizeof cwd) == NULL) 305 return (NULL); 306 if ((pwd = getenv("PWD")) == NULL || *pwd == '\0') 307 return (cwd); 308 309 /* 310 * We want to use PWD so that symbolic links are maintained, 311 * but only if it matches the actual working directory. 312 */ 313 if (realpath(pwd, resolved1) == NULL) 314 return (cwd); 315 if (realpath(cwd, resolved2) == NULL) 316 return (cwd); 317 if (strcmp(resolved1, resolved2) != 0) 318 return (cwd); 319 return (pwd); 320 } 321 322 const char * 323 find_home(void) 324 { 325 struct passwd *pw; 326 static const char *home; 327 328 if (home != NULL) 329 return (home); 330 331 home = getenv("HOME"); 332 if (home == NULL || *home == '\0') { 333 pw = getpwuid(getuid()); 334 if (pw != NULL) 335 home = pw->pw_dir; 336 else 337 home = NULL; 338 } 339 340 return (home); 341 } 342 343 const char * 344 getversion(void) 345 { 346 return (TMUX_VERSION); 347 } 348 349 int 350 main(int argc, char **argv) 351 { 352 char *path = NULL, *label = NULL; 353 char *cause, **var; 354 const char *s, *cwd; 355 int opt, keys, feat = 0, fflag = 0; 356 uint64_t flags = 0; 357 const struct options_table_entry *oe; 358 u_int i; 359 360 if (setlocale(LC_CTYPE, "en_US.UTF-8") == NULL && 361 setlocale(LC_CTYPE, "C.UTF-8") == NULL) { 362 if (setlocale(LC_CTYPE, "") == NULL) 363 errx(1, "invalid LC_ALL, LC_CTYPE or LANG"); 364 s = nl_langinfo(CODESET); 365 if (strcasecmp(s, "UTF-8") != 0 && strcasecmp(s, "UTF8") != 0) 366 errx(1, "need UTF-8 locale (LC_CTYPE) but have %s", s); 367 } 368 369 setlocale(LC_TIME, ""); 370 tzset(); 371 372 if (**argv == '-') 373 flags = CLIENT_LOGIN; 374 375 global_environ = environ_create(); 376 for (var = environ; *var != NULL; var++) 377 environ_put(global_environ, *var, 0); 378 if ((cwd = find_cwd()) != NULL) 379 environ_set(global_environ, "PWD", 0, "%s", cwd); 380 expand_paths(TMUX_CONF, &cfg_files, &cfg_nfiles, 1); 381 382 while ((opt = getopt(argc, argv, "2c:CDdf:lL:NqS:T:uUvV")) != -1) { 383 switch (opt) { 384 case '2': 385 tty_add_features(&feat, "256", ":,"); 386 break; 387 case 'c': 388 shell_command = optarg; 389 break; 390 case 'D': 391 flags |= CLIENT_NOFORK; 392 break; 393 case 'C': 394 if (flags & CLIENT_CONTROL) 395 flags |= CLIENT_CONTROLCONTROL; 396 else 397 flags |= CLIENT_CONTROL; 398 break; 399 case 'f': 400 if (!fflag) { 401 fflag = 1; 402 for (i = 0; i < cfg_nfiles; i++) 403 free(cfg_files[i]); 404 cfg_nfiles = 0; 405 } 406 cfg_files = xreallocarray(cfg_files, cfg_nfiles + 1, 407 sizeof *cfg_files); 408 cfg_files[cfg_nfiles++] = xstrdup(optarg); 409 cfg_quiet = 0; 410 break; 411 case 'V': 412 printf("tmux %s\n", getversion()); 413 exit(0); 414 case 'l': 415 flags |= CLIENT_LOGIN; 416 break; 417 case 'L': 418 free(label); 419 label = xstrdup(optarg); 420 break; 421 case 'N': 422 flags |= CLIENT_NOSTARTSERVER; 423 break; 424 case 'q': 425 break; 426 case 'S': 427 free(path); 428 path = xstrdup(optarg); 429 break; 430 case 'T': 431 tty_add_features(&feat, optarg, ":,"); 432 break; 433 case 'u': 434 flags |= CLIENT_UTF8; 435 break; 436 case 'v': 437 log_add_level(); 438 break; 439 default: 440 usage(); 441 } 442 } 443 argc -= optind; 444 argv += optind; 445 446 if (shell_command != NULL && argc != 0) 447 usage(); 448 if ((flags & CLIENT_NOFORK) && argc != 0) 449 usage(); 450 451 if ((ptm_fd = getptmfd()) == -1) 452 err(1, "getptmfd"); 453 if (pledge("stdio rpath wpath cpath flock fattr unix getpw sendfd " 454 "recvfd proc exec tty ps", NULL) != 0) 455 err(1, "pledge"); 456 457 /* 458 * tmux is a UTF-8 terminal, so if TMUX is set, assume UTF-8. 459 * Otherwise, if the user has set LC_ALL, LC_CTYPE or LANG to contain 460 * UTF-8, it is a safe assumption that either they are using a UTF-8 461 * terminal, or if not they know that output from UTF-8-capable 462 * programs may be wrong. 463 */ 464 if (getenv("TMUX") != NULL) 465 flags |= CLIENT_UTF8; 466 else { 467 s = getenv("LC_ALL"); 468 if (s == NULL || *s == '\0') 469 s = getenv("LC_CTYPE"); 470 if (s == NULL || *s == '\0') 471 s = getenv("LANG"); 472 if (s == NULL || *s == '\0') 473 s = ""; 474 if (strcasestr(s, "UTF-8") != NULL || 475 strcasestr(s, "UTF8") != NULL) 476 flags |= CLIENT_UTF8; 477 } 478 479 global_options = options_create(NULL); 480 global_s_options = options_create(NULL); 481 global_w_options = options_create(NULL); 482 for (oe = options_table; oe->name != NULL; oe++) { 483 if (oe->scope & OPTIONS_TABLE_SERVER) 484 options_default(global_options, oe); 485 if (oe->scope & OPTIONS_TABLE_SESSION) 486 options_default(global_s_options, oe); 487 if (oe->scope & OPTIONS_TABLE_WINDOW) 488 options_default(global_w_options, oe); 489 } 490 491 /* 492 * The default shell comes from SHELL or from the user's passwd entry 493 * if available. 494 */ 495 options_set_string(global_s_options, "default-shell", 0, "%s", 496 getshell()); 497 498 /* Override keys to vi if VISUAL or EDITOR are set. */ 499 if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) { 500 options_set_string(global_options, "editor", 0, "%s", s); 501 if (strrchr(s, '/') != NULL) 502 s = strrchr(s, '/') + 1; 503 if (strstr(s, "vi") != NULL) 504 keys = MODEKEY_VI; 505 else 506 keys = MODEKEY_EMACS; 507 options_set_number(global_s_options, "status-keys", keys); 508 options_set_number(global_w_options, "mode-keys", keys); 509 } 510 511 /* 512 * If socket is specified on the command-line with -S or -L, it is 513 * used. Otherwise, $TMUX is checked and if that fails "default" is 514 * used. 515 */ 516 if (path == NULL && label == NULL) { 517 s = getenv("TMUX"); 518 if (s != NULL && *s != '\0' && *s != ',') { 519 path = xstrdup(s); 520 path[strcspn(path, ",")] = '\0'; 521 } 522 } 523 if (path == NULL) { 524 if ((path = make_label(label, &cause)) == NULL) { 525 if (cause != NULL) { 526 fprintf(stderr, "%s\n", cause); 527 free(cause); 528 } 529 exit(1); 530 } 531 flags |= CLIENT_DEFAULTSOCKET; 532 } 533 socket_path = path; 534 free(label); 535 536 /* Pass control to the client. */ 537 exit(client_main(osdep_event_init(), argc, argv, flags, feat)); 538 } 539
Indexes created Thu Apr 09 00:23:28 UTC 2026