1 /* Id */ 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 <locale.h> 26 #include <pwd.h> 27 #include <stdlib.h> 28 #include <string.h> 29 #include <unistd.h> 30 31 #include "tmux.h" 32 33 #if defined(DEBUG) && defined(__OpenBSD__) 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 52 __dead void usage(void); 53 char *makesocketpath(const char *); 54 55 #ifndef HAVE___PROGNAME 56 char *__progname = (char *) "tmux"; 57 #endif 58 59 __dead void 60 usage(void) 61 { 62 fprintf(stderr, 63 "usage: %s [-2lquvV] [-c shell-command] [-f file] [-L socket-name]\n" 64 " [-S socket-path] [command [flags]]\n", 65 __progname); 66 exit(1); 67 } 68 69 void 70 logfile(const char *name) 71 { 72 char *path; 73 74 if (debug_level > 0) { 75 xasprintf(&path, "tmux-%s-%ld.log", name, (long) getpid()); 76 log_open(debug_level, path); 77 free(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' || *shell != '/') 102 return (0); 103 if (areshell(shell)) 104 return (0); 105 if (access(shell, X_OK) != 0) 106 return (0); 107 return (1); 108 } 109 110 int 111 areshell(const char *shell) 112 { 113 const char *progname, *ptr; 114 115 if ((ptr = strrchr(shell, '/')) != NULL) 116 ptr++; 117 else 118 ptr = shell; 119 progname = __progname; 120 if (*progname == '-') 121 progname++; 122 if (strcmp(ptr, progname) == 0) 123 return (1); 124 return (0); 125 } 126 127 char * 128 makesocketpath(const char *label) 129 { 130 char base[MAXPATHLEN], realbase[MAXPATHLEN], *path, *s; 131 struct stat sb; 132 u_int uid; 133 134 uid = getuid(); 135 if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0') 136 xsnprintf(base, sizeof base, "%s/", s); 137 else if ((s = getenv("TMPDIR")) != NULL && *s != '\0') 138 xsnprintf(base, sizeof base, "%s/tmux-%u", s, uid); 139 else 140 xsnprintf(base, sizeof base, "%s/tmux-%u", _PATH_TMP, uid); 141 142 if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST) 143 return (NULL); 144 145 if (lstat(base, &sb) != 0) 146 return (NULL); 147 if (!S_ISDIR(sb.st_mode)) { 148 errno = ENOTDIR; 149 return (NULL); 150 } 151 if (sb.st_uid != uid || (!S_ISDIR(sb.st_mode) && 152 sb.st_mode & (S_IRWXG|S_IRWXO)) != 0) { 153 errno = EACCES; 154 return (NULL); 155 } 156 157 if (realpath(base, realbase) == NULL) 158 strlcpy(realbase, base, sizeof realbase); 159 160 xasprintf(&path, "%s/%s", realbase, label); 161 return (path); 162 } 163 164 void 165 setblocking(int fd, int state) 166 { 167 int mode; 168 169 if ((mode = fcntl(fd, F_GETFL)) != -1) { 170 if (!state) 171 mode |= O_NONBLOCK; 172 else 173 mode &= ~O_NONBLOCK; 174 fcntl(fd, F_SETFL, mode); 175 } 176 } 177 178 __dead void 179 shell_exec(const char *shell, const char *shellcmd) 180 { 181 const char *shellname, *ptr; 182 char *argv0; 183 184 ptr = strrchr(shell, '/'); 185 if (ptr != NULL && *(ptr + 1) != '\0') 186 shellname = ptr + 1; 187 else 188 shellname = shell; 189 if (login_shell) 190 xasprintf(&argv0, "-%s", shellname); 191 else 192 xasprintf(&argv0, "%s", shellname); 193 setenv("SHELL", shell, 1); 194 195 setblocking(STDIN_FILENO, 1); 196 setblocking(STDOUT_FILENO, 1); 197 setblocking(STDERR_FILENO, 1); 198 closefrom(STDERR_FILENO + 1); 199 200 execl(shell, argv0, "-c", shellcmd, (char *) NULL); 201 fatal("execl failed"); 202 } 203 204 static void 205 init_std_fds(void) 206 { 207 int fd; 208 209 /* 210 * Make sure the standard file descriptors are populated, so we 211 * don't end up forwarding (for example) the event descriptor 212 * instead of stdin to the server. 213 */ 214 215 while ((fd = open("/dev/null", O_RDWR)) <= 2) 216 ; 217 close(fd); 218 } 219 220 int 221 main(int argc, char **argv) 222 { 223 struct passwd *pw; 224 char *s, *path, *label, **var, tmp[MAXPATHLEN]; 225 char in[256]; 226 const char *home; 227 long long pid; 228 int opt, flags, quiet, keys, session; 229 230 #if defined(DEBUG) && defined(__OpenBSD__) 231 malloc_options = (char *) "AFGJPX"; 232 #endif 233 234 setlocale(LC_TIME, ""); 235 236 quiet = flags = 0; 237 label = path = NULL; 238 login_shell = (**argv == '-'); 239 while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUVv")) != -1) { 240 switch (opt) { 241 case '2': 242 flags |= CLIENT_256COLOURS; 243 break; 244 case 'c': 245 free(shell_cmd); 246 shell_cmd = xstrdup(optarg); 247 break; 248 case 'C': 249 if (flags & CLIENT_CONTROL) 250 flags |= CLIENT_CONTROLCONTROL; 251 else 252 flags |= CLIENT_CONTROL; 253 break; 254 case 'V': 255 printf("%s %s\n", __progname, VERSION); 256 exit(0); 257 case 'f': 258 free(cfg_file); 259 cfg_file = xstrdup(optarg); 260 break; 261 case 'l': 262 login_shell = 1; 263 break; 264 case 'L': 265 free(label); 266 label = xstrdup(optarg); 267 break; 268 case 'q': 269 quiet = 1; 270 break; 271 case 'S': 272 free(path); 273 path = xstrdup(optarg); 274 break; 275 case 'u': 276 flags |= CLIENT_UTF8; 277 break; 278 case 'v': 279 debug_level++; 280 break; 281 default: 282 usage(); 283 } 284 } 285 argc -= optind; 286 argv += optind; 287 288 if (shell_cmd != NULL && argc != 0) 289 usage(); 290 291 init_std_fds(); 292 293 if (!(flags & CLIENT_UTF8)) { 294 /* 295 * If the user has set whichever of LC_ALL, LC_CTYPE or LANG 296 * exist (in that order) to contain UTF-8, it is a safe 297 * assumption that either they are using a UTF-8 terminal, or 298 * if not they know that output from UTF-8-capable programs may 299 * be wrong. 300 */ 301 if ((s = getenv("LC_ALL")) == NULL || *s == '\0') { 302 if ((s = getenv("LC_CTYPE")) == NULL || *s == '\0') 303 s = getenv("LANG"); 304 } 305 if (s != NULL && (strcasestr(s, "UTF-8") != NULL || 306 strcasestr(s, "UTF8") != NULL)) 307 flags |= CLIENT_UTF8; 308 } 309 310 environ_init(&global_environ); 311 for (var = environ; *var != NULL; var++) 312 environ_put(&global_environ, *var); 313 if (getcwd(tmp, sizeof tmp) != NULL) 314 environ_set(&global_environ, "PWD", tmp); 315 316 options_init(&global_options, NULL); 317 options_table_populate_tree(server_options_table, &global_options); 318 options_set_number(&global_options, "quiet", quiet); 319 320 options_init(&global_s_options, NULL); 321 options_table_populate_tree(session_options_table, &global_s_options); 322 options_set_string(&global_s_options, "default-shell", "%s", getshell()); 323 324 options_init(&global_w_options, NULL); 325 options_table_populate_tree(window_options_table, &global_w_options); 326 327 /* Enable UTF-8 if the first client is on UTF-8 terminal. */ 328 if (flags & CLIENT_UTF8) { 329 options_set_number(&global_s_options, "status-utf8", 1); 330 options_set_number(&global_s_options, "mouse-utf8", 1); 331 options_set_number(&global_w_options, "utf8", 1); 332 } 333 334 /* Override keys to vi if VISUAL or EDITOR are set. */ 335 if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) { 336 if (strrchr(s, '/') != NULL) 337 s = strrchr(s, '/') + 1; 338 if (strstr(s, "vi") != NULL) 339 keys = MODEKEY_VI; 340 else 341 keys = MODEKEY_EMACS; 342 options_set_number(&global_s_options, "status-keys", keys); 343 options_set_number(&global_w_options, "mode-keys", keys); 344 } 345 346 /* Locate the configuration file. */ 347 if (cfg_file == NULL) { 348 home = getenv("HOME"); 349 if (home == NULL || *home == '\0') { 350 pw = getpwuid(getuid()); 351 if (pw != NULL) 352 home = pw->pw_dir; 353 else 354 home = NULL; 355 } 356 if (home != NULL) { 357 xasprintf(&cfg_file, "%s/.tmux.conf", home); 358 if (access(cfg_file, R_OK) != 0 && errno == ENOENT) { 359 free(cfg_file); 360 cfg_file = NULL; 361 } 362 } 363 } 364 365 /* Get path from environment. */ 366 s = getenv("TMUX"); 367 if (s != NULL && sscanf(s, "%255[^,],%lld,%d", in, &pid, &session) == 3) 368 environ_path = xstrdup(in); 369 370 /* 371 * Figure out the socket path. If specified on the command-line with -S 372 * or -L, use it, otherwise try $TMUX or assume -L default. 373 */ 374 if (path == NULL) { 375 /* If no -L, use the environment. */ 376 if (label == NULL) { 377 if (environ_path != NULL) 378 path = xstrdup(environ_path); 379 else 380 label = xstrdup("default"); 381 } 382 383 /* -L or default set. */ 384 if (label != NULL) { 385 if ((path = makesocketpath(label)) == NULL) { 386 fprintf(stderr, "can't create socket: %s\n", 387 strerror(errno)); 388 exit(1); 389 } 390 } 391 } 392 free(label); 393 394 if (strlcpy(socket_path, path, sizeof socket_path) >= sizeof socket_path) { 395 fprintf(stderr, "socket path too long: %s\n", path); 396 exit(1); 397 } 398 free(path); 399 400 #ifdef HAVE_SETPROCTITLE 401 /* Set process title. */ 402 setproctitle("%s (%s)", __progname, socket_path); 403 #endif 404 405 /* Pass control to the client. */ 406 ev_base = osdep_event_init(); 407 exit(client_main(argc, argv, flags)); 408 } 409