1 /* $Id: tmux.c,v 1.1.1.1 2011/03/10 09:15:39 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__) 33 extern char *malloc_options; 34 #endif 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 event_base *ev_base; 42 43 char *cfg_file; 44 char *shell_cmd; 45 int debug_level; 46 time_t start_time; 47 char socket_path[MAXPATHLEN]; 48 int login_shell; 49 char *environ_path; 50 pid_t environ_pid; 51 u_int environ_idx; 52 53 __dead void usage(void); 54 void parseenvironment(void); 55 char *makesocketpath(const char *); 56 57 #ifndef HAVE_PROGNAME 58 char *__progname = (char *) "tmux"; 59 #endif 60 61 __dead void 62 usage(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 71 void 72 logfile(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 84 const char * 85 getshell(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 } 100 101 int 102 checkshell(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 } 110 111 int 112 areshell(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 } 127 128 void 129 parseenvironment(void) 130 { 131 char *env, *path_pid, *pid_idx, buf[256]; 132 size_t len; 133 const char *errstr; 134 long long ll; 135 136 environ_pid = -1; 137 if ((env = getenv("TMUX")) == NULL) 138 return; 139 140 if ((path_pid = strchr(env, ',')) == NULL || path_pid == env) 141 return; 142 if ((pid_idx = strchr(path_pid + 1, ',')) == NULL) 143 return; 144 if ((pid_idx == path_pid + 1 || pid_idx[1] == '\0')) 145 return; 146 147 /* path */ 148 len = path_pid - env; 149 environ_path = xmalloc(len + 1); 150 memcpy(environ_path, env, len); 151 environ_path[len] = '\0'; 152 153 /* pid */ 154 len = pid_idx - path_pid - 1; 155 if (len > (sizeof buf) - 1) 156 return; 157 memcpy(buf, path_pid + 1, len); 158 buf[len] = '\0'; 159 160 ll = strtonum(buf, 0, LONG_MAX, &errstr); 161 if (errstr != NULL) 162 return; 163 environ_pid = ll; 164 165 /* idx */ 166 ll = strtonum(pid_idx + 1, 0, UINT_MAX, &errstr); 167 if (errstr != NULL) 168 return; 169 environ_idx = ll; 170 } 171 172 char * 173 makesocketpath(const char *label) 174 { 175 char base[MAXPATHLEN], *path; 176 struct stat sb; 177 u_int uid; 178 179 uid = getuid(); 180 xsnprintf(base, MAXPATHLEN, "%s/tmux-%d", _PATH_TMP, uid); 181 182 if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST) 183 return (NULL); 184 185 if (lstat(base, &sb) != 0) 186 return (NULL); 187 if (!S_ISDIR(sb.st_mode)) { 188 errno = ENOTDIR; 189 return (NULL); 190 } 191 if (sb.st_uid != uid || (sb.st_mode & (S_IRWXG|S_IRWXO)) != 0) { 192 errno = EACCES; 193 return (NULL); 194 } 195 196 xasprintf(&path, "%s/%s", base, label); 197 return (path); 198 } 199 200 __dead void 201 shell_exec(const char *shell, const char *shellcmd) 202 { 203 const char *shellname, *ptr; 204 char *argv0; 205 int mode; 206 207 ptr = strrchr(shell, '/'); 208 if (ptr != NULL && *(ptr + 1) != '\0') 209 shellname = ptr + 1; 210 else 211 shellname = shell; 212 if (login_shell) 213 xasprintf(&argv0, "-%s", shellname); 214 else 215 xasprintf(&argv0, "%s", shellname); 216 setenv("SHELL", shell, 1); 217 218 if ((mode = fcntl(STDIN_FILENO, F_GETFL)) != -1) 219 fcntl(STDIN_FILENO, F_SETFL, mode & ~O_NONBLOCK); 220 if ((mode = fcntl(STDOUT_FILENO, F_GETFL)) != -1) 221 fcntl(STDOUT_FILENO, F_SETFL, mode & ~O_NONBLOCK); 222 if ((mode = fcntl(STDERR_FILENO, F_GETFL)) != -1) 223 fcntl(STDERR_FILENO, F_SETFL, mode & ~O_NONBLOCK); 224 closefrom(STDERR_FILENO + 1); 225 226 execl(shell, argv0, "-c", shellcmd, (char *) NULL); 227 fatal("execl failed"); 228 } 229 230 int 231 main(int argc, char **argv) 232 { 233 struct passwd *pw; 234 struct options *oo, *so, *wo; 235 struct keylist *keylist; 236 char *s, *path, *label, *home, **var; 237 int opt, flags, quiet, keys; 238 239 #if defined(DEBUG) && defined(__OpenBSD__) 240 malloc_options = (char *) "AFGJPX"; 241 #endif 242 243 quiet = flags = 0; 244 label = path = NULL; 245 login_shell = (**argv == '-'); 246 while ((opt = getopt(argc, argv, "28c:df:lL:qS:uUvV")) != -1) { 247 switch (opt) { 248 case '2': 249 flags |= IDENTIFY_256COLOURS; 250 flags &= ~IDENTIFY_88COLOURS; 251 break; 252 case '8': 253 flags |= IDENTIFY_88COLOURS; 254 flags &= ~IDENTIFY_256COLOURS; 255 break; 256 case 'c': 257 if (shell_cmd != NULL) 258 xfree(shell_cmd); 259 shell_cmd = xstrdup(optarg); 260 break; 261 case 'V': 262 printf("%s %s\n", __progname, BUILD); 263 exit(0); 264 case 'f': 265 if (cfg_file != NULL) 266 xfree(cfg_file); 267 cfg_file = xstrdup(optarg); 268 break; 269 case 'l': 270 login_shell = 1; 271 break; 272 case 'L': 273 if (label != NULL) 274 xfree(label); 275 label = xstrdup(optarg); 276 break; 277 case 'q': 278 quiet = 1; 279 break; 280 case 'S': 281 if (path != NULL) 282 xfree(path); 283 path = xstrdup(optarg); 284 break; 285 case 'u': 286 flags |= IDENTIFY_UTF8; 287 break; 288 case 'v': 289 debug_level++; 290 break; 291 default: 292 usage(); 293 } 294 } 295 argc -= optind; 296 argv += optind; 297 298 if (shell_cmd != NULL && argc != 0) 299 usage(); 300 301 log_open_tty(debug_level); 302 303 if (!(flags & IDENTIFY_UTF8)) { 304 /* 305 * If the user has set whichever of LC_ALL, LC_CTYPE or LANG 306 * exist (in that order) to contain UTF-8, it is a safe 307 * assumption that either they are using a UTF-8 terminal, or 308 * if not they know that output from UTF-8-capable programs may 309 * be wrong. 310 */ 311 if ((s = getenv("LC_ALL")) == NULL) { 312 if ((s = getenv("LC_CTYPE")) == NULL) 313 s = getenv("LANG"); 314 } 315 if (s != NULL && (strcasestr(s, "UTF-8") != NULL || 316 strcasestr(s, "UTF8") != NULL)) 317 flags |= IDENTIFY_UTF8; 318 } 319 320 environ_init(&global_environ); 321 for (var = environ; *var != NULL; var++) 322 environ_put(&global_environ, *var); 323 324 options_init(&global_options, NULL); 325 oo = &global_options; 326 options_set_number(oo, "quiet", quiet); 327 options_set_number(oo, "escape-time", 500); 328 options_set_number(oo, "exit-unattached", 0); 329 330 options_init(&global_s_options, NULL); 331 so = &global_s_options; 332 options_set_number(so, "base-index", 0); 333 options_set_number(so, "bell-action", BELL_ANY); 334 options_set_number(so, "buffer-limit", 9); 335 options_set_string(so, "default-command", "%s", ""); 336 options_set_string(so, "default-path", "%s", ""); 337 options_set_string(so, "default-shell", "%s", getshell()); 338 options_set_string(so, "default-terminal", "screen"); 339 options_set_number(so, "destroy-unattached", 0); 340 options_set_number(so, "detach-on-destroy", 1); 341 options_set_number(so, "display-panes-active-colour", 1); 342 options_set_number(so, "display-panes-colour", 4); 343 options_set_number(so, "display-panes-time", 1000); 344 options_set_number(so, "display-time", 750); 345 options_set_number(so, "history-limit", 2000); 346 options_set_number(so, "lock-after-time", 0); 347 options_set_string(so, "lock-command", "lock -np"); 348 options_set_number(so, "lock-server", 1); 349 options_set_number(so, "message-attr", 0); 350 options_set_number(so, "message-bg", 3); 351 options_set_number(so, "message-fg", 0); 352 options_set_number(so, "message-limit", 20); 353 options_set_number(so, "mouse-select-pane", 0); 354 options_set_number(so, "pane-active-border-bg", 8); 355 options_set_number(so, "pane-active-border-fg", 2); 356 options_set_number(so, "pane-border-bg", 8); 357 options_set_number(so, "pane-border-fg", 8); 358 options_set_number(so, "repeat-time", 500); 359 options_set_number(so, "set-remain-on-exit", 0); 360 options_set_number(so, "set-titles", 0); 361 options_set_string(so, "set-titles-string", "#S:#I:#W - \"#T\""); 362 options_set_number(so, "status", 1); 363 options_set_number(so, "status-attr", 0); 364 options_set_number(so, "status-bg", 2); 365 options_set_number(so, "status-fg", 0); 366 options_set_number(so, "status-interval", 15); 367 options_set_number(so, "status-justify", 0); 368 options_set_string(so, "status-left", "[#S]"); 369 options_set_number(so, "status-left-attr", 0); 370 options_set_number(so, "status-left-bg", 8); 371 options_set_number(so, "status-left-fg", 8); 372 options_set_number(so, "status-left-length", 10); 373 options_set_string(so, "status-right", "\"#22T\" %%H:%%M %%d-%%b-%%y"); 374 options_set_number(so, "status-right-attr", 0); 375 options_set_number(so, "status-right-bg", 8); 376 options_set_number(so, "status-right-fg", 8); 377 options_set_number(so, "status-right-length", 40); 378 options_set_string(so, "terminal-overrides", 379 "*88col*:colors=88,*256col*:colors=256"); 380 options_set_string(so, "update-environment", 381 "DISPLAY " 382 "SSH_ASKPASS SSH_AUTH_SOCK SSH_AGENT_PID SSH_CONNECTION " 383 "WINDOWID " 384 "XAUTHORITY"); 385 options_set_number(so, "visual-activity", 0); 386 options_set_number(so, "visual-bell", 0); 387 options_set_number(so, "visual-content", 0); 388 options_set_number(so, "visual-silence", 0); 389 390 keylist = xmalloc(sizeof *keylist); 391 ARRAY_INIT(keylist); 392 ARRAY_ADD(keylist, '\002'); 393 options_set_data(so, "prefix", keylist, xfree); 394 395 options_init(&global_w_options, NULL); 396 wo = &global_w_options; 397 options_set_number(wo, "aggressive-resize", 0); 398 options_set_number(wo, "alternate-screen", 1); 399 options_set_number(wo, "automatic-rename", 1); 400 options_set_number(wo, "clock-mode-colour", 4); 401 options_set_number(wo, "clock-mode-style", 1); 402 options_set_number(wo, "force-height", 0); 403 options_set_number(wo, "force-width", 0); 404 options_set_number(wo, "main-pane-height", 24); 405 options_set_number(wo, "main-pane-width", 80); 406 options_set_number(wo, "mode-attr", 0); 407 options_set_number(wo, "mode-bg", 3); 408 options_set_number(wo, "mode-fg", 0); 409 options_set_number(wo, "mode-mouse", 0); 410 options_set_number(wo, "monitor-activity", 0); 411 options_set_string(wo, "monitor-content", "%s", ""); 412 options_set_number(wo, "monitor-silence", 0); 413 options_set_number(wo, "other-pane-height", 0); 414 options_set_number(wo, "other-pane-width", 0); 415 options_set_number(wo, "window-status-attr", 0); 416 options_set_number(wo, "window-status-bg", 8); 417 options_set_number(wo, "window-status-current-attr", 0); 418 options_set_number(wo, "window-status-current-bg", 8); 419 options_set_number(wo, "window-status-current-fg", 8); 420 options_set_number(wo, "window-status-fg", 8); 421 options_set_number(wo, "window-status-alert-attr", GRID_ATTR_REVERSE); 422 options_set_number(wo, "window-status-alert-bg", 8); 423 options_set_number(wo, "window-status-alert-fg", 8); 424 options_set_string(wo, "window-status-format", "#I:#W#F"); 425 options_set_string(wo, "window-status-current-format", "#I:#W#F"); 426 options_set_string(wo, "word-separators", " -_@"); 427 options_set_number(wo, "xterm-keys", 0); 428 options_set_number(wo, "remain-on-exit", 0); 429 options_set_number(wo, "synchronize-panes", 0); 430 431 if (flags & IDENTIFY_UTF8) { 432 options_set_number(so, "status-utf8", 1); 433 options_set_number(wo, "utf8", 1); 434 } else { 435 options_set_number(so, "status-utf8", 0); 436 options_set_number(wo, "utf8", 0); 437 } 438 439 keys = MODEKEY_EMACS; 440 if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) { 441 if (strrchr(s, '/') != NULL) 442 s = strrchr(s, '/') + 1; 443 if (strstr(s, "vi") != NULL) 444 keys = MODEKEY_VI; 445 } 446 options_set_number(so, "status-keys", keys); 447 options_set_number(wo, "mode-keys", keys); 448 449 /* Locate the configuration file. */ 450 if (cfg_file == NULL) { 451 home = getenv("HOME"); 452 if (home == NULL || *home == '\0') { 453 pw = getpwuid(getuid()); 454 if (pw != NULL) 455 home = pw->pw_dir; 456 } 457 xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG); 458 if (access(cfg_file, R_OK) != 0 && errno == ENOENT) { 459 xfree(cfg_file); 460 cfg_file = NULL; 461 } 462 } 463 464 /* 465 * Figure out the socket path. If specified on the command-line with -S 466 * or -L, use it, otherwise try $TMUX or assume -L default. 467 */ 468 parseenvironment(); 469 if (path == NULL) { 470 /* If no -L, use the environment. */ 471 if (label == NULL) { 472 if (environ_path != NULL) 473 path = xstrdup(environ_path); 474 else 475 label = xstrdup("default"); 476 } 477 478 /* -L or default set. */ 479 if (label != NULL) { 480 if ((path = makesocketpath(label)) == NULL) { 481 log_warn("can't create socket"); 482 exit(1); 483 } 484 } 485 } 486 if (label != NULL) 487 xfree(label); 488 if (realpath(path, socket_path) == NULL) 489 strlcpy(socket_path, path, sizeof socket_path); 490 xfree(path); 491 492 #ifdef HAVE_SETPROCTITLE 493 /* Set process title. */ 494 setproctitle("%s (%s)", __progname, socket_path); 495 #endif 496 497 /* Pass control to the client. */ 498 #ifdef HAVE_BROKEN_KQUEUE 499 if (setenv("EVENT_NOKQUEUE", "1", 1) != 0) 500 fatal("setenv failed"); 501 #endif 502 #ifdef HAVE_BROKEN_POLL 503 if (setenv("EVENT_NOPOLL", "1", 1) != 0) 504 fatal("setenv failed"); 505 #endif 506 ev_base = event_init(); 507 #ifdef HAVE_BROKEN_KQUEUE 508 unsetenv("EVENT_NOKQUEUE"); 509 #endif 510 #ifdef HAVE_BROKEN_POLL 511 unsetenv("EVENT_NOPOLL"); 512 #endif 513 exit(client_main(argc, argv, flags)); 514 } 515