1 /* $OpenBSD: tmux.c,v 1.124 2013/10/10 12:12:08 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 <locale.h> 26 #include <paths.h> 27 #include <pwd.h> 28 #include <stdlib.h> 29 #include <string.h> 30 #include <unistd.h> 31 32 #include "tmux.h" 33 34 #ifdef DEBUG 35 extern char *malloc_options; 36 #endif 37 38 struct options global_options; /* server options */ 39 struct options global_s_options; /* session options */ 40 struct options global_w_options; /* window options */ 41 struct environ global_environ; 42 43 struct event_base *ev_base; 44 45 char *cfg_file; 46 char *shell_cmd; 47 int debug_level; 48 time_t start_time; 49 char socket_path[MAXPATHLEN]; 50 int login_shell; 51 char *environ_path; 52 pid_t environ_pid = -1; 53 int environ_session_id = -1; 54 55 __dead void usage(void); 56 void parseenvironment(void); 57 char *makesocketpath(const char *); 58 59 __dead void 60 usage(void) 61 { 62 fprintf(stderr, 63 "usage: %s [-28lquv] [-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 const char* 128 get_full_path(const char *wd, const char *path) 129 { 130 int fd; 131 static char newpath[MAXPATHLEN]; 132 const char *retval; 133 134 fd = open(".", O_RDONLY); 135 if (fd == -1) 136 return (NULL); 137 138 retval = NULL; 139 if (chdir(wd) == 0) { 140 if (realpath(path, newpath) == 0) 141 retval = newpath; 142 } 143 144 if (fchdir(fd) != 0) 145 chdir("/"); 146 close(fd); 147 148 return (retval); 149 } 150 151 void 152 parseenvironment(void) 153 { 154 char *env, path[256]; 155 long pid; 156 int id; 157 158 if ((env = getenv("TMUX")) == NULL) 159 return; 160 161 if (sscanf(env, "%255[^,],%ld,%d", path, &pid, &id) != 3) 162 return; 163 environ_path = xstrdup(path); 164 environ_pid = pid; 165 environ_session_id = id; 166 } 167 168 char * 169 makesocketpath(const char *label) 170 { 171 char base[MAXPATHLEN], realbase[MAXPATHLEN], *path, *s; 172 struct stat sb; 173 u_int uid; 174 175 uid = getuid(); 176 if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0') 177 xsnprintf(base, sizeof base, "%s/", s); 178 else if ((s = getenv("TMPDIR")) != NULL && *s != '\0') 179 xsnprintf(base, sizeof base, "%s/tmux-%u", s, uid); 180 else 181 xsnprintf(base, sizeof base, "%s/tmux-%u", _PATH_TMP, uid); 182 183 if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST) 184 return (NULL); 185 186 if (lstat(base, &sb) != 0) 187 return (NULL); 188 if (!S_ISDIR(sb.st_mode)) { 189 errno = ENOTDIR; 190 return (NULL); 191 } 192 if (sb.st_uid != uid || (!S_ISDIR(sb.st_mode) && 193 sb.st_mode & (S_IRWXG|S_IRWXO)) != 0) { 194 errno = EACCES; 195 return (NULL); 196 } 197 198 if (realpath(base, realbase) == NULL) 199 strlcpy(realbase, base, sizeof realbase); 200 201 xasprintf(&path, "%s/%s", realbase, label); 202 return (path); 203 } 204 205 void 206 setblocking(int fd, int state) 207 { 208 int mode; 209 210 if ((mode = fcntl(fd, F_GETFL)) != -1) { 211 if (!state) 212 mode |= O_NONBLOCK; 213 else 214 mode &= ~O_NONBLOCK; 215 fcntl(fd, F_SETFL, mode); 216 } 217 } 218 219 __dead void 220 shell_exec(const char *shell, const char *shellcmd) 221 { 222 const char *shellname, *ptr; 223 char *argv0; 224 225 ptr = strrchr(shell, '/'); 226 if (ptr != NULL && *(ptr + 1) != '\0') 227 shellname = ptr + 1; 228 else 229 shellname = shell; 230 if (login_shell) 231 xasprintf(&argv0, "-%s", shellname); 232 else 233 xasprintf(&argv0, "%s", shellname); 234 setenv("SHELL", shell, 1); 235 236 setblocking(STDIN_FILENO, 1); 237 setblocking(STDOUT_FILENO, 1); 238 setblocking(STDERR_FILENO, 1); 239 closefrom(STDERR_FILENO + 1); 240 241 execl(shell, argv0, "-c", shellcmd, (char *) NULL); 242 fatal("execl failed"); 243 } 244 245 int 246 main(int argc, char **argv) 247 { 248 struct passwd *pw; 249 char *s, *path, *label, *home, **var; 250 int opt, flags, quiet, keys; 251 252 #ifdef DEBUG 253 malloc_options = (char *) "AFGJPX"; 254 #endif 255 256 setlocale(LC_TIME, ""); 257 258 quiet = flags = 0; 259 label = path = NULL; 260 login_shell = (**argv == '-'); 261 while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUv")) != -1) { 262 switch (opt) { 263 case '2': 264 flags |= CLIENT_256COLOURS; 265 break; 266 case 'c': 267 free(shell_cmd); 268 shell_cmd = xstrdup(optarg); 269 break; 270 case 'C': 271 if (flags & CLIENT_CONTROL) 272 flags |= CLIENT_CONTROLCONTROL; 273 else 274 flags |= CLIENT_CONTROL; 275 break; 276 case 'f': 277 free(cfg_file); 278 cfg_file = xstrdup(optarg); 279 break; 280 case 'l': 281 login_shell = 1; 282 break; 283 case 'L': 284 free(label); 285 label = xstrdup(optarg); 286 break; 287 case 'q': 288 quiet = 1; 289 break; 290 case 'S': 291 free(path); 292 path = xstrdup(optarg); 293 break; 294 case 'u': 295 flags |= CLIENT_UTF8; 296 break; 297 case 'v': 298 debug_level++; 299 break; 300 default: 301 usage(); 302 } 303 } 304 argc -= optind; 305 argv += optind; 306 307 if (shell_cmd != NULL && argc != 0) 308 usage(); 309 310 if (!(flags & CLIENT_UTF8)) { 311 /* 312 * If the user has set whichever of LC_ALL, LC_CTYPE or LANG 313 * exist (in that order) to contain UTF-8, it is a safe 314 * assumption that either they are using a UTF-8 terminal, or 315 * if not they know that output from UTF-8-capable programs may 316 * be wrong. 317 */ 318 if ((s = getenv("LC_ALL")) == NULL || *s == '\0') { 319 if ((s = getenv("LC_CTYPE")) == NULL || *s == '\0') 320 s = getenv("LANG"); 321 } 322 if (s != NULL && (strcasestr(s, "UTF-8") != NULL || 323 strcasestr(s, "UTF8") != NULL)) 324 flags |= CLIENT_UTF8; 325 } 326 327 environ_init(&global_environ); 328 for (var = environ; *var != NULL; var++) 329 environ_put(&global_environ, *var); 330 331 options_init(&global_options, NULL); 332 options_table_populate_tree(server_options_table, &global_options); 333 options_set_number(&global_options, "quiet", quiet); 334 335 options_init(&global_s_options, NULL); 336 options_table_populate_tree(session_options_table, &global_s_options); 337 options_set_string(&global_s_options, "default-shell", "%s", getshell()); 338 339 options_init(&global_w_options, NULL); 340 options_table_populate_tree(window_options_table, &global_w_options); 341 342 /* Enable UTF-8 if the first client is on UTF-8 terminal. */ 343 if (flags & CLIENT_UTF8) { 344 options_set_number(&global_s_options, "status-utf8", 1); 345 options_set_number(&global_s_options, "mouse-utf8", 1); 346 options_set_number(&global_w_options, "utf8", 1); 347 } 348 349 /* Override keys to vi if VISUAL or EDITOR are set. */ 350 if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) { 351 if (strrchr(s, '/') != NULL) 352 s = strrchr(s, '/') + 1; 353 if (strstr(s, "vi") != NULL) 354 keys = MODEKEY_VI; 355 else 356 keys = MODEKEY_EMACS; 357 options_set_number(&global_s_options, "status-keys", keys); 358 options_set_number(&global_w_options, "mode-keys", keys); 359 } 360 361 /* Locate the configuration file. */ 362 if (cfg_file == NULL) { 363 home = getenv("HOME"); 364 if (home == NULL || *home == '\0') { 365 pw = getpwuid(getuid()); 366 if (pw != NULL) 367 home = pw->pw_dir; 368 } 369 xasprintf(&cfg_file, "%s/.tmux.conf", home); 370 if (access(cfg_file, R_OK) != 0 && errno == ENOENT) { 371 free(cfg_file); 372 cfg_file = NULL; 373 } 374 } 375 376 /* 377 * Figure out the socket path. If specified on the command-line with -S 378 * or -L, use it, otherwise try $TMUX or assume -L default. 379 */ 380 parseenvironment(); 381 if (path == NULL) { 382 /* If no -L, use the environment. */ 383 if (label == NULL) { 384 if (environ_path != NULL) 385 path = xstrdup(environ_path); 386 else 387 label = xstrdup("default"); 388 } 389 390 /* -L or default set. */ 391 if (label != NULL) { 392 if ((path = makesocketpath(label)) == NULL) { 393 fprintf(stderr, "can't create socket: %s\n", 394 strerror(errno)); 395 exit(1); 396 } 397 } 398 } 399 free(label); 400 strlcpy(socket_path, path, sizeof socket_path); 401 free(path); 402 403 /* Set process title. */ 404 setproctitle("%s (%s)", __progname, socket_path); 405 406 /* Pass control to the client. */ 407 ev_base = event_init(); 408 exit(client_main(argc, argv, flags)); 409 } 410