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