1 /* $OpenBSD: tmux.c,v 1.108 2012/01/21 08:40:09 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 = -1; 52 int environ_idx = -1; 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' || *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 const char* 128 get_full_path(const char *wd, const char *path) 129 { 130 static char newpath[MAXPATHLEN]; 131 char oldpath[MAXPATHLEN]; 132 133 if (getcwd(oldpath, sizeof oldpath) == NULL) 134 return (NULL); 135 if (chdir(wd) != 0) 136 return (NULL); 137 if (realpath(path, newpath) != 0) 138 return (NULL); 139 chdir(oldpath); 140 return (newpath); 141 } 142 143 void 144 parseenvironment(void) 145 { 146 char *env, path[256]; 147 long pid; 148 int idx; 149 150 if ((env = getenv("TMUX")) == NULL) 151 return; 152 153 if (sscanf(env, "%255[^,],%ld,%d", path, &pid, &idx) != 3) 154 return; 155 environ_path = xstrdup(path); 156 environ_pid = pid; 157 environ_idx = idx; 158 } 159 160 char * 161 makesocketpath(const char *label) 162 { 163 char base[MAXPATHLEN], *path, *s; 164 struct stat sb; 165 u_int uid; 166 167 uid = getuid(); 168 if ((s = getenv("TMPDIR")) == NULL || *s == '\0') 169 xsnprintf(base, sizeof base, "%s/tmux-%u", _PATH_TMP, uid); 170 else 171 xsnprintf(base, sizeof base, "%s/tmux-%u", s, uid); 172 173 if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST) 174 return (NULL); 175 176 if (lstat(base, &sb) != 0) 177 return (NULL); 178 if (!S_ISDIR(sb.st_mode)) { 179 errno = ENOTDIR; 180 return (NULL); 181 } 182 if (sb.st_uid != uid || (sb.st_mode & (S_IRWXG|S_IRWXO)) != 0) { 183 errno = EACCES; 184 return (NULL); 185 } 186 187 xasprintf(&path, "%s/%s", base, label); 188 return (path); 189 } 190 191 void 192 setblocking(int fd, int state) 193 { 194 int mode; 195 196 if ((mode = fcntl(fd, F_GETFL)) != -1) { 197 if (!state) 198 mode |= O_NONBLOCK; 199 else 200 mode &= ~O_NONBLOCK; 201 fcntl(fd, F_SETFL, mode); 202 } 203 } 204 205 __dead void 206 shell_exec(const char *shell, const char *shellcmd) 207 { 208 const char *shellname, *ptr; 209 char *argv0; 210 211 ptr = strrchr(shell, '/'); 212 if (ptr != NULL && *(ptr + 1) != '\0') 213 shellname = ptr + 1; 214 else 215 shellname = shell; 216 if (login_shell) 217 xasprintf(&argv0, "-%s", shellname); 218 else 219 xasprintf(&argv0, "%s", shellname); 220 setenv("SHELL", shell, 1); 221 222 setblocking(STDIN_FILENO, 1); 223 setblocking(STDOUT_FILENO, 1); 224 setblocking(STDERR_FILENO, 1); 225 closefrom(STDERR_FILENO + 1); 226 227 execl(shell, argv0, "-c", shellcmd, (char *) NULL); 228 fatal("execl failed"); 229 } 230 231 int 232 main(int argc, char **argv) 233 { 234 struct passwd *pw; 235 char *s, *path, *label, *home, **var; 236 int opt, flags, quiet, keys; 237 238 #ifdef DEBUG 239 malloc_options = (char *) "AFGJPX"; 240 #endif 241 242 quiet = flags = 0; 243 label = path = NULL; 244 login_shell = (**argv == '-'); 245 while ((opt = getopt(argc, argv, "28c:df:lL:qS:uUv")) != -1) { 246 switch (opt) { 247 case '2': 248 flags |= IDENTIFY_256COLOURS; 249 flags &= ~IDENTIFY_88COLOURS; 250 break; 251 case '8': 252 flags |= IDENTIFY_88COLOURS; 253 flags &= ~IDENTIFY_256COLOURS; 254 break; 255 case 'c': 256 if (shell_cmd != NULL) 257 xfree(shell_cmd); 258 shell_cmd = xstrdup(optarg); 259 break; 260 case 'f': 261 if (cfg_file != NULL) 262 xfree(cfg_file); 263 cfg_file = xstrdup(optarg); 264 break; 265 case 'l': 266 login_shell = 1; 267 break; 268 case 'L': 269 if (label != NULL) 270 xfree(label); 271 label = xstrdup(optarg); 272 break; 273 case 'q': 274 quiet = 1; 275 break; 276 case 'S': 277 if (path != NULL) 278 xfree(path); 279 path = xstrdup(optarg); 280 break; 281 case 'u': 282 flags |= IDENTIFY_UTF8; 283 break; 284 case 'v': 285 debug_level++; 286 break; 287 default: 288 usage(); 289 } 290 } 291 argc -= optind; 292 argv += optind; 293 294 if (shell_cmd != NULL && argc != 0) 295 usage(); 296 297 log_open_tty(debug_level); 298 299 if (!(flags & IDENTIFY_UTF8)) { 300 /* 301 * If the user has set whichever of LC_ALL, LC_CTYPE or LANG 302 * exist (in that order) to contain UTF-8, it is a safe 303 * assumption that either they are using a UTF-8 terminal, or 304 * if not they know that output from UTF-8-capable programs may 305 * be wrong. 306 */ 307 if ((s = getenv("LC_ALL")) == NULL || *s == '\0') { 308 if ((s = getenv("LC_CTYPE")) == NULL || *s == '\0') 309 s = getenv("LANG"); 310 } 311 if (s != NULL && (strcasestr(s, "UTF-8") != NULL || 312 strcasestr(s, "UTF8") != NULL)) 313 flags |= IDENTIFY_UTF8; 314 } 315 316 environ_init(&global_environ); 317 for (var = environ; *var != NULL; var++) 318 environ_put(&global_environ, *var); 319 320 options_init(&global_options, NULL); 321 options_table_populate_tree(server_options_table, &global_options); 322 options_set_number(&global_options, "quiet", quiet); 323 324 options_init(&global_s_options, NULL); 325 options_table_populate_tree(session_options_table, &global_s_options); 326 options_set_string(&global_s_options, "default-shell", "%s", getshell()); 327 328 options_init(&global_w_options, NULL); 329 options_table_populate_tree(window_options_table, &global_w_options); 330 331 /* Enable UTF-8 if the first client is on UTF-8 terminal. */ 332 if (flags & IDENTIFY_UTF8) { 333 options_set_number(&global_s_options, "status-utf8", 1); 334 options_set_number(&global_s_options, "mouse-utf8", 1); 335 options_set_number(&global_w_options, "utf8", 1); 336 } 337 338 /* Override keys to vi if VISUAL or EDITOR are set. */ 339 if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) { 340 if (strrchr(s, '/') != NULL) 341 s = strrchr(s, '/') + 1; 342 if (strstr(s, "vi") != NULL) 343 keys = MODEKEY_VI; 344 else 345 keys = MODEKEY_EMACS; 346 options_set_number(&global_s_options, "status-keys", keys); 347 options_set_number(&global_w_options, "mode-keys", keys); 348 } 349 350 /* Locate the configuration file. */ 351 if (cfg_file == NULL) { 352 home = getenv("HOME"); 353 if (home == NULL || *home == '\0') { 354 pw = getpwuid(getuid()); 355 if (pw != NULL) 356 home = pw->pw_dir; 357 } 358 xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG); 359 if (access(cfg_file, R_OK) != 0 && errno == ENOENT) { 360 xfree(cfg_file); 361 cfg_file = NULL; 362 } 363 } 364 365 /* 366 * Figure out the socket path. If specified on the command-line with -S 367 * or -L, use it, otherwise try $TMUX or assume -L default. 368 */ 369 parseenvironment(); 370 if (path == NULL) { 371 /* If no -L, use the environment. */ 372 if (label == NULL) { 373 if (environ_path != NULL) 374 path = xstrdup(environ_path); 375 else 376 label = xstrdup("default"); 377 } 378 379 /* -L or default set. */ 380 if (label != NULL) { 381 if ((path = makesocketpath(label)) == NULL) { 382 log_warn("can't create socket"); 383 exit(1); 384 } 385 } 386 } 387 if (label != NULL) 388 xfree(label); 389 if (realpath(path, socket_path) == NULL) 390 strlcpy(socket_path, path, sizeof socket_path); 391 xfree(path); 392 393 /* Set process title. */ 394 setproctitle("%s (%s)", __progname, socket_path); 395 396 /* Pass control to the client. */ 397 ev_base = event_init(); 398 exit(client_main(argc, argv, flags)); 399 } 400