1 /* $OpenBSD: tmux.c,v 1.98 2010/12/30 23:16:18 nicm 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 <paths.h> 26 #include <pwd.h> 27 #include <stdlib.h> 28 #include <string.h> 29 #include <unistd.h> 30 31 #include "tmux.h" 32 33 #ifdef DEBUG 34 extern char *malloc_options; 35 #endif 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 42 struct event_base *ev_base; 43 44 char *cfg_file; 45 char *shell_cmd; 46 int debug_level; 47 time_t start_time; 48 char socket_path[MAXPATHLEN]; 49 int login_shell; 50 char *environ_path; 51 pid_t environ_pid; 52 u_int environ_idx; 53 54 __dead void usage(void); 55 void parseenvironment(void); 56 char *makesocketpath(const char *); 57 58 __dead void 59 usage(void) 60 { 61 fprintf(stderr, 62 "usage: %s [-28lquv] [-c shell-command] [-f file] [-L socket-name]\n" 63 " [-S socket-path] [command [flags]]\n", 64 __progname); 65 exit(1); 66 } 67 68 void 69 logfile(const char *name) 70 { 71 char *path; 72 73 log_close(); 74 if (debug_level > 0) { 75 xasprintf(&path, "tmux-%s-%ld.log", name, (long) getpid()); 76 log_open_file(debug_level, path); 77 xfree(path); 78 } 79 } 80 81 const char * 82 getshell(void) 83 { 84 struct passwd *pw; 85 const char *shell; 86 87 shell = getenv("SHELL"); 88 if (checkshell(shell)) 89 return (shell); 90 91 pw = getpwuid(getuid()); 92 if (pw != NULL && checkshell(pw->pw_shell)) 93 return (pw->pw_shell); 94 95 return (_PATH_BSHELL); 96 } 97 98 int 99 checkshell(const char *shell) 100 { 101 if (shell == NULL || *shell == '\0' || areshell(shell)) 102 return (0); 103 if (access(shell, X_OK) != 0) 104 return (0); 105 return (1); 106 } 107 108 int 109 areshell(const char *shell) 110 { 111 const char *progname, *ptr; 112 113 if ((ptr = strrchr(shell, '/')) != NULL) 114 ptr++; 115 else 116 ptr = shell; 117 progname = __progname; 118 if (*progname == '-') 119 progname++; 120 if (strcmp(ptr, progname) == 0) 121 return (1); 122 return (0); 123 } 124 125 void 126 parseenvironment(void) 127 { 128 char *env, *path_pid, *pid_idx, buf[256]; 129 size_t len; 130 const char *errstr; 131 long long ll; 132 133 environ_pid = -1; 134 if ((env = getenv("TMUX")) == NULL) 135 return; 136 137 if ((path_pid = strchr(env, ',')) == NULL || path_pid == env) 138 return; 139 if ((pid_idx = strchr(path_pid + 1, ',')) == NULL) 140 return; 141 if ((pid_idx == path_pid + 1 || pid_idx[1] == '\0')) 142 return; 143 144 /* path */ 145 len = path_pid - env; 146 environ_path = xmalloc(len + 1); 147 memcpy(environ_path, env, len); 148 environ_path[len] = '\0'; 149 150 /* pid */ 151 len = pid_idx - path_pid - 1; 152 if (len > (sizeof buf) - 1) 153 return; 154 memcpy(buf, path_pid + 1, len); 155 buf[len] = '\0'; 156 157 ll = strtonum(buf, 0, LONG_MAX, &errstr); 158 if (errstr != NULL) 159 return; 160 environ_pid = ll; 161 162 /* idx */ 163 ll = strtonum(pid_idx + 1, 0, UINT_MAX, &errstr); 164 if (errstr != NULL) 165 return; 166 environ_idx = ll; 167 } 168 169 char * 170 makesocketpath(const char *label) 171 { 172 char base[MAXPATHLEN], *path; 173 struct stat sb; 174 u_int uid; 175 176 uid = getuid(); 177 xsnprintf(base, MAXPATHLEN, "%s/tmux-%d", _PATH_TMP, uid); 178 179 if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST) 180 return (NULL); 181 182 if (lstat(base, &sb) != 0) 183 return (NULL); 184 if (!S_ISDIR(sb.st_mode)) { 185 errno = ENOTDIR; 186 return (NULL); 187 } 188 if (sb.st_uid != uid || (sb.st_mode & (S_IRWXG|S_IRWXO)) != 0) { 189 errno = EACCES; 190 return (NULL); 191 } 192 193 xasprintf(&path, "%s/%s", base, label); 194 return (path); 195 } 196 197 __dead void 198 shell_exec(const char *shell, const char *shellcmd) 199 { 200 const char *shellname, *ptr; 201 char *argv0; 202 int mode; 203 204 ptr = strrchr(shell, '/'); 205 if (ptr != NULL && *(ptr + 1) != '\0') 206 shellname = ptr + 1; 207 else 208 shellname = shell; 209 if (login_shell) 210 xasprintf(&argv0, "-%s", shellname); 211 else 212 xasprintf(&argv0, "%s", shellname); 213 setenv("SHELL", shell, 1); 214 215 if ((mode = fcntl(STDIN_FILENO, F_GETFL)) != -1) 216 fcntl(STDIN_FILENO, F_SETFL, mode & ~O_NONBLOCK); 217 if ((mode = fcntl(STDOUT_FILENO, F_GETFL)) != -1) 218 fcntl(STDOUT_FILENO, F_SETFL, mode & ~O_NONBLOCK); 219 if ((mode = fcntl(STDERR_FILENO, F_GETFL)) != -1) 220 fcntl(STDERR_FILENO, F_SETFL, mode & ~O_NONBLOCK); 221 closefrom(STDERR_FILENO + 1); 222 223 execl(shell, argv0, "-c", shellcmd, (char *) NULL); 224 fatal("execl failed"); 225 } 226 227 int 228 main(int argc, char **argv) 229 { 230 struct passwd *pw; 231 struct options *oo, *so, *wo; 232 struct keylist *keylist; 233 char *s, *path, *label, *home, **var; 234 int opt, flags, quiet, keys; 235 236 #ifdef DEBUG 237 malloc_options = (char *) "AFGJPX"; 238 #endif 239 240 quiet = flags = 0; 241 label = path = NULL; 242 login_shell = (**argv == '-'); 243 while ((opt = getopt(argc, argv, "28c:df:lL:qS:uUv")) != -1) { 244 switch (opt) { 245 case '2': 246 flags |= IDENTIFY_256COLOURS; 247 flags &= ~IDENTIFY_88COLOURS; 248 break; 249 case '8': 250 flags |= IDENTIFY_88COLOURS; 251 flags &= ~IDENTIFY_256COLOURS; 252 break; 253 case 'c': 254 if (shell_cmd != NULL) 255 xfree(shell_cmd); 256 shell_cmd = xstrdup(optarg); 257 break; 258 case 'f': 259 if (cfg_file != NULL) 260 xfree(cfg_file); 261 cfg_file = xstrdup(optarg); 262 break; 263 case 'l': 264 login_shell = 1; 265 break; 266 case 'L': 267 if (label != NULL) 268 xfree(label); 269 label = xstrdup(optarg); 270 break; 271 case 'q': 272 quiet = 1; 273 break; 274 case 'S': 275 if (path != NULL) 276 xfree(path); 277 path = xstrdup(optarg); 278 break; 279 case 'u': 280 flags |= IDENTIFY_UTF8; 281 break; 282 case 'v': 283 debug_level++; 284 break; 285 default: 286 usage(); 287 } 288 } 289 argc -= optind; 290 argv += optind; 291 292 if (shell_cmd != NULL && argc != 0) 293 usage(); 294 295 log_open_tty(debug_level); 296 297 if (!(flags & IDENTIFY_UTF8)) { 298 /* 299 * If the user has set whichever of LC_ALL, LC_CTYPE or LANG 300 * exist (in that order) to contain UTF-8, it is a safe 301 * assumption that either they are using a UTF-8 terminal, or 302 * if not they know that output from UTF-8-capable programs may 303 * be wrong. 304 */ 305 if ((s = getenv("LC_ALL")) == NULL) { 306 if ((s = getenv("LC_CTYPE")) == NULL) 307 s = getenv("LANG"); 308 } 309 if (s != NULL && (strcasestr(s, "UTF-8") != NULL || 310 strcasestr(s, "UTF8") != NULL)) 311 flags |= IDENTIFY_UTF8; 312 } 313 314 environ_init(&global_environ); 315 for (var = environ; *var != NULL; var++) 316 environ_put(&global_environ, *var); 317 318 options_init(&global_options, NULL); 319 oo = &global_options; 320 options_set_number(oo, "quiet", quiet); 321 options_set_number(oo, "escape-time", 500); 322 options_set_number(oo, "exit-unattached", 0); 323 options_set_number(oo, "buffer-limit", 9); 324 325 options_init(&global_s_options, NULL); 326 so = &global_s_options; 327 options_set_number(so, "base-index", 0); 328 options_set_number(so, "bell-action", BELL_ANY); 329 options_set_string(so, "default-command", "%s", ""); 330 options_set_string(so, "default-path", "%s", ""); 331 options_set_string(so, "default-shell", "%s", getshell()); 332 options_set_string(so, "default-terminal", "screen"); 333 options_set_number(so, "destroy-unattached", 0); 334 options_set_number(so, "detach-on-destroy", 1); 335 options_set_number(so, "display-panes-active-colour", 1); 336 options_set_number(so, "display-panes-colour", 4); 337 options_set_number(so, "display-panes-time", 1000); 338 options_set_number(so, "display-time", 750); 339 options_set_number(so, "history-limit", 2000); 340 options_set_number(so, "lock-after-time", 0); 341 options_set_string(so, "lock-command", "lock -np"); 342 options_set_number(so, "lock-server", 1); 343 options_set_number(so, "message-attr", 0); 344 options_set_number(so, "message-bg", 3); 345 options_set_number(so, "message-fg", 0); 346 options_set_number(so, "message-limit", 20); 347 options_set_number(so, "mouse-select-pane", 0); 348 options_set_number(so, "pane-active-border-bg", 8); 349 options_set_number(so, "pane-active-border-fg", 2); 350 options_set_number(so, "pane-border-bg", 8); 351 options_set_number(so, "pane-border-fg", 8); 352 options_set_number(so, "repeat-time", 500); 353 options_set_number(so, "set-remain-on-exit", 0); 354 options_set_number(so, "set-titles", 0); 355 options_set_string(so, "set-titles-string", "#S:#I:#W - \"#T\""); 356 options_set_number(so, "status", 1); 357 options_set_number(so, "status-attr", 0); 358 options_set_number(so, "status-bg", 2); 359 options_set_number(so, "status-fg", 0); 360 options_set_number(so, "status-interval", 15); 361 options_set_number(so, "status-justify", 0); 362 options_set_string(so, "status-left", "[#S]"); 363 options_set_number(so, "status-left-attr", 0); 364 options_set_number(so, "status-left-bg", 8); 365 options_set_number(so, "status-left-fg", 8); 366 options_set_number(so, "status-left-length", 10); 367 options_set_string(so, "status-right", "\"#22T\" %%H:%%M %%d-%%b-%%y"); 368 options_set_number(so, "status-right-attr", 0); 369 options_set_number(so, "status-right-bg", 8); 370 options_set_number(so, "status-right-fg", 8); 371 options_set_number(so, "status-right-length", 40); 372 options_set_string(so, "terminal-overrides", 373 "*88col*:colors=88,*256col*:colors=256"); 374 options_set_string(so, "update-environment", 375 "DISPLAY " 376 "SSH_ASKPASS SSH_AUTH_SOCK SSH_AGENT_PID SSH_CONNECTION " 377 "WINDOWID " 378 "XAUTHORITY"); 379 options_set_number(so, "visual-activity", 0); 380 options_set_number(so, "visual-bell", 0); 381 options_set_number(so, "visual-content", 0); 382 options_set_number(so, "visual-silence", 0); 383 384 keylist = xmalloc(sizeof *keylist); 385 ARRAY_INIT(keylist); 386 ARRAY_ADD(keylist, '\002'); 387 options_set_data(so, "prefix", keylist, xfree); 388 389 options_init(&global_w_options, NULL); 390 wo = &global_w_options; 391 options_set_number(wo, "aggressive-resize", 0); 392 options_set_number(wo, "alternate-screen", 1); 393 options_set_number(wo, "automatic-rename", 1); 394 options_set_number(wo, "clock-mode-colour", 4); 395 options_set_number(wo, "clock-mode-style", 1); 396 options_set_number(wo, "force-height", 0); 397 options_set_number(wo, "force-width", 0); 398 options_set_number(wo, "main-pane-height", 24); 399 options_set_number(wo, "main-pane-width", 80); 400 options_set_number(wo, "mode-attr", 0); 401 options_set_number(wo, "mode-bg", 3); 402 options_set_number(wo, "mode-fg", 0); 403 options_set_number(wo, "mode-mouse", 0); 404 options_set_number(wo, "monitor-activity", 0); 405 options_set_string(wo, "monitor-content", "%s", ""); 406 options_set_number(wo, "monitor-silence", 0); 407 options_set_number(wo, "other-pane-height", 0); 408 options_set_number(wo, "other-pane-width", 0); 409 options_set_number(wo, "window-status-attr", 0); 410 options_set_number(wo, "window-status-bg", 8); 411 options_set_number(wo, "window-status-current-attr", 0); 412 options_set_number(wo, "window-status-current-bg", 8); 413 options_set_number(wo, "window-status-current-fg", 8); 414 options_set_number(wo, "window-status-fg", 8); 415 options_set_number(wo, "window-status-alert-attr", GRID_ATTR_REVERSE); 416 options_set_number(wo, "window-status-alert-bg", 8); 417 options_set_number(wo, "window-status-alert-fg", 8); 418 options_set_string(wo, "window-status-format", "#I:#W#F"); 419 options_set_string(wo, "window-status-current-format", "#I:#W#F"); 420 options_set_string(wo, "word-separators", " -_@"); 421 options_set_number(wo, "xterm-keys", 0); 422 options_set_number(wo, "remain-on-exit", 0); 423 options_set_number(wo, "synchronize-panes", 0); 424 425 if (flags & IDENTIFY_UTF8) { 426 options_set_number(so, "status-utf8", 1); 427 options_set_number(wo, "utf8", 1); 428 } else { 429 options_set_number(so, "status-utf8", 0); 430 options_set_number(wo, "utf8", 0); 431 } 432 433 keys = MODEKEY_EMACS; 434 if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) { 435 if (strrchr(s, '/') != NULL) 436 s = strrchr(s, '/') + 1; 437 if (strstr(s, "vi") != NULL) 438 keys = MODEKEY_VI; 439 } 440 options_set_number(so, "status-keys", keys); 441 options_set_number(wo, "mode-keys", keys); 442 443 /* Locate the configuration file. */ 444 if (cfg_file == NULL) { 445 home = getenv("HOME"); 446 if (home == NULL || *home == '\0') { 447 pw = getpwuid(getuid()); 448 if (pw != NULL) 449 home = pw->pw_dir; 450 } 451 xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG); 452 if (access(cfg_file, R_OK) != 0 && errno == ENOENT) { 453 xfree(cfg_file); 454 cfg_file = NULL; 455 } 456 } 457 458 /* 459 * Figure out the socket path. If specified on the command-line with -S 460 * or -L, use it, otherwise try $TMUX or assume -L default. 461 */ 462 parseenvironment(); 463 if (path == NULL) { 464 /* If no -L, use the environment. */ 465 if (label == NULL) { 466 if (environ_path != NULL) 467 path = xstrdup(environ_path); 468 else 469 label = xstrdup("default"); 470 } 471 472 /* -L or default set. */ 473 if (label != NULL) { 474 if ((path = makesocketpath(label)) == NULL) { 475 log_warn("can't create socket"); 476 exit(1); 477 } 478 } 479 } 480 if (label != NULL) 481 xfree(label); 482 if (realpath(path, socket_path) == NULL) 483 strlcpy(socket_path, path, sizeof socket_path); 484 xfree(path); 485 486 /* Set process title. */ 487 setproctitle("%s (%s)", __progname, socket_path); 488 489 /* Pass control to the client. */ 490 ev_base = event_init(); 491 exit(client_main(argc, argv, flags)); 492 } 493