1 /* $OpenBSD: tmux.c,v 1.125 2013/10/10 12:26:36 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 void 128 parseenvironment(void) 129 { 130 char *env, path[256]; 131 long pid; 132 int id; 133 134 if ((env = getenv("TMUX")) == NULL) 135 return; 136 137 if (sscanf(env, "%255[^,],%ld,%d", path, &pid, &id) != 3) 138 return; 139 environ_path = xstrdup(path); 140 environ_pid = pid; 141 environ_session_id = id; 142 } 143 144 char * 145 makesocketpath(const char *label) 146 { 147 char base[MAXPATHLEN], realbase[MAXPATHLEN], *path, *s; 148 struct stat sb; 149 u_int uid; 150 151 uid = getuid(); 152 if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0') 153 xsnprintf(base, sizeof base, "%s/", s); 154 else if ((s = getenv("TMPDIR")) != NULL && *s != '\0') 155 xsnprintf(base, sizeof base, "%s/tmux-%u", s, uid); 156 else 157 xsnprintf(base, sizeof base, "%s/tmux-%u", _PATH_TMP, uid); 158 159 if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST) 160 return (NULL); 161 162 if (lstat(base, &sb) != 0) 163 return (NULL); 164 if (!S_ISDIR(sb.st_mode)) { 165 errno = ENOTDIR; 166 return (NULL); 167 } 168 if (sb.st_uid != uid || (!S_ISDIR(sb.st_mode) && 169 sb.st_mode & (S_IRWXG|S_IRWXO)) != 0) { 170 errno = EACCES; 171 return (NULL); 172 } 173 174 if (realpath(base, realbase) == NULL) 175 strlcpy(realbase, base, sizeof realbase); 176 177 xasprintf(&path, "%s/%s", realbase, label); 178 return (path); 179 } 180 181 void 182 setblocking(int fd, int state) 183 { 184 int mode; 185 186 if ((mode = fcntl(fd, F_GETFL)) != -1) { 187 if (!state) 188 mode |= O_NONBLOCK; 189 else 190 mode &= ~O_NONBLOCK; 191 fcntl(fd, F_SETFL, mode); 192 } 193 } 194 195 __dead void 196 shell_exec(const char *shell, const char *shellcmd) 197 { 198 const char *shellname, *ptr; 199 char *argv0; 200 201 ptr = strrchr(shell, '/'); 202 if (ptr != NULL && *(ptr + 1) != '\0') 203 shellname = ptr + 1; 204 else 205 shellname = shell; 206 if (login_shell) 207 xasprintf(&argv0, "-%s", shellname); 208 else 209 xasprintf(&argv0, "%s", shellname); 210 setenv("SHELL", shell, 1); 211 212 setblocking(STDIN_FILENO, 1); 213 setblocking(STDOUT_FILENO, 1); 214 setblocking(STDERR_FILENO, 1); 215 closefrom(STDERR_FILENO + 1); 216 217 execl(shell, argv0, "-c", shellcmd, (char *) NULL); 218 fatal("execl failed"); 219 } 220 221 int 222 main(int argc, char **argv) 223 { 224 struct passwd *pw; 225 char *s, *path, *label, *home, **var, tmp[MAXPATHLEN]; 226 int opt, flags, quiet, keys; 227 228 #ifdef DEBUG 229 malloc_options = (char *) "AFGJPX"; 230 #endif 231 232 setlocale(LC_TIME, ""); 233 234 quiet = flags = 0; 235 label = path = NULL; 236 login_shell = (**argv == '-'); 237 while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUv")) != -1) { 238 switch (opt) { 239 case '2': 240 flags |= CLIENT_256COLOURS; 241 break; 242 case 'c': 243 free(shell_cmd); 244 shell_cmd = xstrdup(optarg); 245 break; 246 case 'C': 247 if (flags & CLIENT_CONTROL) 248 flags |= CLIENT_CONTROLCONTROL; 249 else 250 flags |= CLIENT_CONTROL; 251 break; 252 case 'f': 253 free(cfg_file); 254 cfg_file = xstrdup(optarg); 255 break; 256 case 'l': 257 login_shell = 1; 258 break; 259 case 'L': 260 free(label); 261 label = xstrdup(optarg); 262 break; 263 case 'q': 264 quiet = 1; 265 break; 266 case 'S': 267 free(path); 268 path = xstrdup(optarg); 269 break; 270 case 'u': 271 flags |= CLIENT_UTF8; 272 break; 273 case 'v': 274 debug_level++; 275 break; 276 default: 277 usage(); 278 } 279 } 280 argc -= optind; 281 argv += optind; 282 283 if (shell_cmd != NULL && argc != 0) 284 usage(); 285 286 if (!(flags & CLIENT_UTF8)) { 287 /* 288 * If the user has set whichever of LC_ALL, LC_CTYPE or LANG 289 * exist (in that order) to contain UTF-8, it is a safe 290 * assumption that either they are using a UTF-8 terminal, or 291 * if not they know that output from UTF-8-capable programs may 292 * be wrong. 293 */ 294 if ((s = getenv("LC_ALL")) == NULL || *s == '\0') { 295 if ((s = getenv("LC_CTYPE")) == NULL || *s == '\0') 296 s = getenv("LANG"); 297 } 298 if (s != NULL && (strcasestr(s, "UTF-8") != NULL || 299 strcasestr(s, "UTF8") != NULL)) 300 flags |= CLIENT_UTF8; 301 } 302 303 environ_init(&global_environ); 304 for (var = environ; *var != NULL; var++) 305 environ_put(&global_environ, *var); 306 if (getcwd(tmp, sizeof tmp) != NULL) 307 environ_set(&global_environ, "PWD", tmp); 308 309 options_init(&global_options, NULL); 310 options_table_populate_tree(server_options_table, &global_options); 311 options_set_number(&global_options, "quiet", quiet); 312 313 options_init(&global_s_options, NULL); 314 options_table_populate_tree(session_options_table, &global_s_options); 315 options_set_string(&global_s_options, "default-shell", "%s", getshell()); 316 317 options_init(&global_w_options, NULL); 318 options_table_populate_tree(window_options_table, &global_w_options); 319 320 /* Enable UTF-8 if the first client is on UTF-8 terminal. */ 321 if (flags & CLIENT_UTF8) { 322 options_set_number(&global_s_options, "status-utf8", 1); 323 options_set_number(&global_s_options, "mouse-utf8", 1); 324 options_set_number(&global_w_options, "utf8", 1); 325 } 326 327 /* Override keys to vi if VISUAL or EDITOR are set. */ 328 if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) { 329 if (strrchr(s, '/') != NULL) 330 s = strrchr(s, '/') + 1; 331 if (strstr(s, "vi") != NULL) 332 keys = MODEKEY_VI; 333 else 334 keys = MODEKEY_EMACS; 335 options_set_number(&global_s_options, "status-keys", keys); 336 options_set_number(&global_w_options, "mode-keys", keys); 337 } 338 339 /* Locate the configuration file. */ 340 if (cfg_file == NULL) { 341 home = getenv("HOME"); 342 if (home == NULL || *home == '\0') { 343 pw = getpwuid(getuid()); 344 if (pw != NULL) 345 home = pw->pw_dir; 346 } 347 xasprintf(&cfg_file, "%s/.tmux.conf", home); 348 if (access(cfg_file, R_OK) != 0 && errno == ENOENT) { 349 free(cfg_file); 350 cfg_file = NULL; 351 } 352 } 353 354 /* 355 * Figure out the socket path. If specified on the command-line with -S 356 * or -L, use it, otherwise try $TMUX or assume -L default. 357 */ 358 parseenvironment(); 359 if (path == NULL) { 360 /* If no -L, use the environment. */ 361 if (label == NULL) { 362 if (environ_path != NULL) 363 path = xstrdup(environ_path); 364 else 365 label = xstrdup("default"); 366 } 367 368 /* -L or default set. */ 369 if (label != NULL) { 370 if ((path = makesocketpath(label)) == NULL) { 371 fprintf(stderr, "can't create socket: %s\n", 372 strerror(errno)); 373 exit(1); 374 } 375 } 376 } 377 free(label); 378 strlcpy(socket_path, path, sizeof socket_path); 379 free(path); 380 381 /* Set process title. */ 382 setproctitle("%s (%s)", __progname, socket_path); 383 384 /* Pass control to the client. */ 385 ev_base = event_init(); 386 exit(client_main(argc, argv, flags)); 387 } 388