1 /* $OpenBSD: tmux.c,v 1.118 2013/03/27 11:24:18 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 = -1; 52 int environ_session_id = -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 if (debug_level > 0) { 74 xasprintf(&path, "tmux-%s-%ld.log", name, (long) getpid()); 75 log_open(debug_level, path); 76 free(path); 77 } 78 } 79 80 const char * 81 getshell(void) 82 { 83 struct passwd *pw; 84 const char *shell; 85 86 shell = getenv("SHELL"); 87 if (checkshell(shell)) 88 return (shell); 89 90 pw = getpwuid(getuid()); 91 if (pw != NULL && checkshell(pw->pw_shell)) 92 return (pw->pw_shell); 93 94 return (_PATH_BSHELL); 95 } 96 97 int 98 checkshell(const char *shell) 99 { 100 if (shell == NULL || *shell == '\0' || *shell != '/') 101 return (0); 102 if (areshell(shell)) 103 return (0); 104 if (access(shell, X_OK) != 0) 105 return (0); 106 return (1); 107 } 108 109 int 110 areshell(const char *shell) 111 { 112 const char *progname, *ptr; 113 114 if ((ptr = strrchr(shell, '/')) != NULL) 115 ptr++; 116 else 117 ptr = shell; 118 progname = __progname; 119 if (*progname == '-') 120 progname++; 121 if (strcmp(ptr, progname) == 0) 122 return (1); 123 return (0); 124 } 125 126 const char* 127 get_full_path(const char *wd, const char *path) 128 { 129 static char newpath[MAXPATHLEN]; 130 char oldpath[MAXPATHLEN]; 131 132 if (getcwd(oldpath, sizeof oldpath) == NULL) 133 return (NULL); 134 if (chdir(wd) != 0) 135 return (NULL); 136 if (realpath(path, newpath) != 0) 137 return (NULL); 138 chdir(oldpath); 139 return (newpath); 140 } 141 142 void 143 parseenvironment(void) 144 { 145 char *env, path[256]; 146 long pid; 147 int id; 148 149 if ((env = getenv("TMUX")) == NULL) 150 return; 151 152 if (sscanf(env, "%255[^,],%ld,%d", path, &pid, &id) != 3) 153 return; 154 environ_path = xstrdup(path); 155 environ_pid = pid; 156 environ_session_id = id; 157 } 158 159 char * 160 makesocketpath(const char *label) 161 { 162 char base[MAXPATHLEN], realbase[MAXPATHLEN], *path, *s; 163 struct stat sb; 164 u_int uid; 165 166 uid = getuid(); 167 if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0') 168 xsnprintf(base, sizeof base, "%s/", s); 169 else if ((s = getenv("TMPDIR")) != NULL && *s != '\0') 170 xsnprintf(base, sizeof base, "%s/tmux-%u", s, uid); 171 else 172 xsnprintf(base, sizeof base, "%s/tmux-%u", _PATH_TMP, uid); 173 174 if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST) 175 return (NULL); 176 177 if (lstat(base, &sb) != 0) 178 return (NULL); 179 if (!S_ISDIR(sb.st_mode)) { 180 errno = ENOTDIR; 181 return (NULL); 182 } 183 if (sb.st_uid != uid || (sb.st_mode & (S_IRWXG|S_IRWXO)) != 0) { 184 errno = EACCES; 185 return (NULL); 186 } 187 188 if (realpath(base, realbase) == NULL) 189 strlcpy(realbase, base, sizeof realbase); 190 191 xasprintf(&path, "%s/%s", realbase, label); 192 return (path); 193 } 194 195 void 196 setblocking(int fd, int state) 197 { 198 int mode; 199 200 if ((mode = fcntl(fd, F_GETFL)) != -1) { 201 if (!state) 202 mode |= O_NONBLOCK; 203 else 204 mode &= ~O_NONBLOCK; 205 fcntl(fd, F_SETFL, mode); 206 } 207 } 208 209 __dead void 210 shell_exec(const char *shell, const char *shellcmd) 211 { 212 const char *shellname, *ptr; 213 char *argv0; 214 215 ptr = strrchr(shell, '/'); 216 if (ptr != NULL && *(ptr + 1) != '\0') 217 shellname = ptr + 1; 218 else 219 shellname = shell; 220 if (login_shell) 221 xasprintf(&argv0, "-%s", shellname); 222 else 223 xasprintf(&argv0, "%s", shellname); 224 setenv("SHELL", shell, 1); 225 226 setblocking(STDIN_FILENO, 1); 227 setblocking(STDOUT_FILENO, 1); 228 setblocking(STDERR_FILENO, 1); 229 closefrom(STDERR_FILENO + 1); 230 231 execl(shell, argv0, "-c", shellcmd, (char *) NULL); 232 fatal("execl failed"); 233 } 234 235 int 236 main(int argc, char **argv) 237 { 238 struct passwd *pw; 239 char *s, *path, *label, *home, **var; 240 int opt, flags, quiet, keys; 241 242 #ifdef DEBUG 243 malloc_options = (char *) "AFGJPX"; 244 #endif 245 246 quiet = flags = 0; 247 label = path = NULL; 248 login_shell = (**argv == '-'); 249 while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUv")) != -1) { 250 switch (opt) { 251 case '2': 252 flags |= IDENTIFY_256COLOURS; 253 break; 254 case 'c': 255 free(shell_cmd); 256 shell_cmd = xstrdup(optarg); 257 break; 258 case 'C': 259 if (flags & IDENTIFY_CONTROL) 260 flags |= IDENTIFY_TERMIOS; 261 else 262 flags |= IDENTIFY_CONTROL; 263 break; 264 case 'f': 265 free(cfg_file); 266 cfg_file = xstrdup(optarg); 267 break; 268 case 'l': 269 login_shell = 1; 270 break; 271 case 'L': 272 free(label); 273 label = xstrdup(optarg); 274 break; 275 case 'q': 276 quiet = 1; 277 break; 278 case 'S': 279 free(path); 280 path = xstrdup(optarg); 281 break; 282 case 'u': 283 flags |= IDENTIFY_UTF8; 284 break; 285 case 'v': 286 debug_level++; 287 break; 288 default: 289 usage(); 290 } 291 } 292 argc -= optind; 293 argv += optind; 294 295 if (shell_cmd != NULL && argc != 0) 296 usage(); 297 298 if (!(flags & IDENTIFY_UTF8)) { 299 /* 300 * If the user has set whichever of LC_ALL, LC_CTYPE or LANG 301 * exist (in that order) to contain UTF-8, it is a safe 302 * assumption that either they are using a UTF-8 terminal, or 303 * if not they know that output from UTF-8-capable programs may 304 * be wrong. 305 */ 306 if ((s = getenv("LC_ALL")) == NULL || *s == '\0') { 307 if ((s = getenv("LC_CTYPE")) == NULL || *s == '\0') 308 s = getenv("LANG"); 309 } 310 if (s != NULL && (strcasestr(s, "UTF-8") != NULL || 311 strcasestr(s, "UTF8") != NULL)) 312 flags |= IDENTIFY_UTF8; 313 } 314 315 environ_init(&global_environ); 316 for (var = environ; *var != NULL; var++) 317 environ_put(&global_environ, *var); 318 319 options_init(&global_options, NULL); 320 options_table_populate_tree(server_options_table, &global_options); 321 options_set_number(&global_options, "quiet", quiet); 322 323 options_init(&global_s_options, NULL); 324 options_table_populate_tree(session_options_table, &global_s_options); 325 options_set_string(&global_s_options, "default-shell", "%s", getshell()); 326 327 options_init(&global_w_options, NULL); 328 options_table_populate_tree(window_options_table, &global_w_options); 329 330 /* Enable UTF-8 if the first client is on UTF-8 terminal. */ 331 if (flags & IDENTIFY_UTF8) { 332 options_set_number(&global_s_options, "status-utf8", 1); 333 options_set_number(&global_s_options, "mouse-utf8", 1); 334 options_set_number(&global_w_options, "utf8", 1); 335 } 336 337 /* Override keys to vi if VISUAL or EDITOR are set. */ 338 if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) { 339 if (strrchr(s, '/') != NULL) 340 s = strrchr(s, '/') + 1; 341 if (strstr(s, "vi") != NULL) 342 keys = MODEKEY_VI; 343 else 344 keys = MODEKEY_EMACS; 345 options_set_number(&global_s_options, "status-keys", keys); 346 options_set_number(&global_w_options, "mode-keys", keys); 347 } 348 349 /* Locate the configuration file. */ 350 if (cfg_file == NULL) { 351 home = getenv("HOME"); 352 if (home == NULL || *home == '\0') { 353 pw = getpwuid(getuid()); 354 if (pw != NULL) 355 home = pw->pw_dir; 356 } 357 xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG); 358 if (access(cfg_file, R_OK) != 0 && errno == ENOENT) { 359 free(cfg_file); 360 cfg_file = NULL; 361 } 362 } 363 364 /* 365 * Figure out the socket path. If specified on the command-line with -S 366 * or -L, use it, otherwise try $TMUX or assume -L default. 367 */ 368 parseenvironment(); 369 if (path == NULL) { 370 /* If no -L, use the environment. */ 371 if (label == NULL) { 372 if (environ_path != NULL) 373 path = xstrdup(environ_path); 374 else 375 label = xstrdup("default"); 376 } 377 378 /* -L or default set. */ 379 if (label != NULL) { 380 if ((path = makesocketpath(label)) == NULL) { 381 fprintf(stderr, "can't create socket\n"); 382 exit(1); 383 } 384 } 385 } 386 free(label); 387 strlcpy(socket_path, path, sizeof socket_path); 388 free(path); 389 390 /* Set process title. */ 391 setproctitle("%s (%s)", __progname, socket_path); 392 393 /* Pass control to the client. */ 394 ev_base = event_init(); 395 exit(client_main(argc, argv, flags)); 396 } 397