1 /* $OpenBSD: tmux.c,v 1.102 2011/01/12 22:23:58 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, *s; 173 struct stat sb; 174 u_int uid; 175 176 uid = getuid(); 177 if ((s = getenv("TMPDIR")) == NULL || *s == '\0') 178 xsnprintf(base, sizeof base, "%s/tmux-%u", _PATH_TMP, uid); 179 else 180 xsnprintf(base, sizeof base, "%s/tmux-%u", s, 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 void 201 setblocking(int fd, int state) 202 { 203 int mode; 204 205 if ((mode = fcntl(fd, F_GETFL)) != -1) { 206 if (!state) 207 mode |= O_NONBLOCK; 208 else 209 mode &= ~O_NONBLOCK; 210 fcntl(fd, F_SETFL, mode); 211 } 212 } 213 214 __dead void 215 shell_exec(const char *shell, const char *shellcmd) 216 { 217 const char *shellname, *ptr; 218 char *argv0; 219 220 ptr = strrchr(shell, '/'); 221 if (ptr != NULL && *(ptr + 1) != '\0') 222 shellname = ptr + 1; 223 else 224 shellname = shell; 225 if (login_shell) 226 xasprintf(&argv0, "-%s", shellname); 227 else 228 xasprintf(&argv0, "%s", shellname); 229 setenv("SHELL", shell, 1); 230 231 setblocking(STDIN_FILENO, 1); 232 setblocking(STDOUT_FILENO, 1); 233 setblocking(STDERR_FILENO, 1); 234 closefrom(STDERR_FILENO + 1); 235 236 execl(shell, argv0, "-c", shellcmd, (char *) NULL); 237 fatal("execl failed"); 238 } 239 240 int 241 main(int argc, char **argv) 242 { 243 struct passwd *pw; 244 struct keylist *keylist; 245 char *s, *path, *label, *home, **var; 246 int opt, flags, quiet, keys; 247 248 #ifdef DEBUG 249 malloc_options = (char *) "AFGJPX"; 250 #endif 251 252 quiet = flags = 0; 253 label = path = NULL; 254 login_shell = (**argv == '-'); 255 while ((opt = getopt(argc, argv, "28c:df:lL:qS:uUv")) != -1) { 256 switch (opt) { 257 case '2': 258 flags |= IDENTIFY_256COLOURS; 259 flags &= ~IDENTIFY_88COLOURS; 260 break; 261 case '8': 262 flags |= IDENTIFY_88COLOURS; 263 flags &= ~IDENTIFY_256COLOURS; 264 break; 265 case 'c': 266 if (shell_cmd != NULL) 267 xfree(shell_cmd); 268 shell_cmd = xstrdup(optarg); 269 break; 270 case 'f': 271 if (cfg_file != NULL) 272 xfree(cfg_file); 273 cfg_file = xstrdup(optarg); 274 break; 275 case 'l': 276 login_shell = 1; 277 break; 278 case 'L': 279 if (label != NULL) 280 xfree(label); 281 label = xstrdup(optarg); 282 break; 283 case 'q': 284 quiet = 1; 285 break; 286 case 'S': 287 if (path != NULL) 288 xfree(path); 289 path = xstrdup(optarg); 290 break; 291 case 'u': 292 flags |= IDENTIFY_UTF8; 293 break; 294 case 'v': 295 debug_level++; 296 break; 297 default: 298 usage(); 299 } 300 } 301 argc -= optind; 302 argv += optind; 303 304 if (shell_cmd != NULL && argc != 0) 305 usage(); 306 307 log_open_tty(debug_level); 308 309 if (!(flags & IDENTIFY_UTF8)) { 310 /* 311 * If the user has set whichever of LC_ALL, LC_CTYPE or LANG 312 * exist (in that order) to contain UTF-8, it is a safe 313 * assumption that either they are using a UTF-8 terminal, or 314 * if not they know that output from UTF-8-capable programs may 315 * be wrong. 316 */ 317 if ((s = getenv("LC_ALL")) == NULL) { 318 if ((s = getenv("LC_CTYPE")) == NULL) 319 s = getenv("LANG"); 320 } 321 if (s != NULL && (strcasestr(s, "UTF-8") != NULL || 322 strcasestr(s, "UTF8") != NULL)) 323 flags |= IDENTIFY_UTF8; 324 } 325 326 environ_init(&global_environ); 327 for (var = environ; *var != NULL; var++) 328 environ_put(&global_environ, *var); 329 330 options_init(&global_options, NULL); 331 options_table_populate_tree(server_options_table, &global_options); 332 options_set_number(&global_options, "quiet", quiet); 333 334 options_init(&global_s_options, NULL); 335 options_table_populate_tree(session_options_table, &global_s_options); 336 options_set_string(&global_s_options, "default-shell", "%s", getshell()); 337 338 options_init(&global_w_options, NULL); 339 options_table_populate_tree(window_options_table, &global_w_options); 340 341 /* Set the prefix option (its a list, so not in the table). */ 342 keylist = xmalloc(sizeof *keylist); 343 ARRAY_INIT(keylist); 344 ARRAY_ADD(keylist, '\002'); 345 options_set_data(&global_s_options, "prefix", keylist, xfree); 346 347 /* Enable UTF-8 if the first client is on UTF-8 terminal. */ 348 if (flags & IDENTIFY_UTF8) { 349 options_set_number(&global_s_options, "status-utf8", 1); 350 options_set_number(&global_s_options, "mouse-utf8", 1); 351 options_set_number(&global_w_options, "utf8", 1); 352 } 353 354 /* Override keys to vi if VISUAL or EDITOR are set. */ 355 if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) { 356 if (strrchr(s, '/') != NULL) 357 s = strrchr(s, '/') + 1; 358 if (strstr(s, "vi") != NULL) 359 keys = MODEKEY_VI; 360 else 361 keys = MODEKEY_EMACS; 362 options_set_number(&global_s_options, "status-keys", keys); 363 options_set_number(&global_w_options, "mode-keys", keys); 364 } 365 366 /* Locate the configuration file. */ 367 if (cfg_file == NULL) { 368 home = getenv("HOME"); 369 if (home == NULL || *home == '\0') { 370 pw = getpwuid(getuid()); 371 if (pw != NULL) 372 home = pw->pw_dir; 373 } 374 xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG); 375 if (access(cfg_file, R_OK) != 0 && errno == ENOENT) { 376 xfree(cfg_file); 377 cfg_file = NULL; 378 } 379 } 380 381 /* 382 * Figure out the socket path. If specified on the command-line with -S 383 * or -L, use it, otherwise try $TMUX or assume -L default. 384 */ 385 parseenvironment(); 386 if (path == NULL) { 387 /* If no -L, use the environment. */ 388 if (label == NULL) { 389 if (environ_path != NULL) 390 path = xstrdup(environ_path); 391 else 392 label = xstrdup("default"); 393 } 394 395 /* -L or default set. */ 396 if (label != NULL) { 397 if ((path = makesocketpath(label)) == NULL) { 398 log_warn("can't create socket"); 399 exit(1); 400 } 401 } 402 } 403 if (label != NULL) 404 xfree(label); 405 if (realpath(path, socket_path) == NULL) 406 strlcpy(socket_path, path, sizeof socket_path); 407 xfree(path); 408 409 /* Set process title. */ 410 setproctitle("%s (%s)", __progname, socket_path); 411 412 /* Pass control to the client. */ 413 ev_base = event_init(); 414 exit(client_main(argc, argv, flags)); 415 } 416