1 /* $OpenBSD: tmux.c,v 1.129 2014/02/16 12:45:17 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 53 __dead void usage(void); 54 char *makesocketpath(const char *); 55 56 __dead void 57 usage(void) 58 { 59 fprintf(stderr, 60 "usage: %s [-2lquv] [-c shell-command] [-f file] [-L socket-name]\n" 61 " [-S socket-path] [command [flags]]\n", 62 __progname); 63 exit(1); 64 } 65 66 void 67 logfile(const char *name) 68 { 69 char *path; 70 71 if (debug_level > 0) { 72 xasprintf(&path, "tmux-%s-%ld.log", name, (long) getpid()); 73 log_open(debug_level, path); 74 free(path); 75 } 76 } 77 78 const char * 79 getshell(void) 80 { 81 struct passwd *pw; 82 const char *shell; 83 84 shell = getenv("SHELL"); 85 if (checkshell(shell)) 86 return (shell); 87 88 pw = getpwuid(getuid()); 89 if (pw != NULL && checkshell(pw->pw_shell)) 90 return (pw->pw_shell); 91 92 return (_PATH_BSHELL); 93 } 94 95 int 96 checkshell(const char *shell) 97 { 98 if (shell == NULL || *shell == '\0' || *shell != '/') 99 return (0); 100 if (areshell(shell)) 101 return (0); 102 if (access(shell, X_OK) != 0) 103 return (0); 104 return (1); 105 } 106 107 int 108 areshell(const char *shell) 109 { 110 const char *progname, *ptr; 111 112 if ((ptr = strrchr(shell, '/')) != NULL) 113 ptr++; 114 else 115 ptr = shell; 116 progname = __progname; 117 if (*progname == '-') 118 progname++; 119 if (strcmp(ptr, progname) == 0) 120 return (1); 121 return (0); 122 } 123 124 char * 125 makesocketpath(const char *label) 126 { 127 char base[MAXPATHLEN], realbase[MAXPATHLEN], *path, *s; 128 struct stat sb; 129 u_int uid; 130 131 uid = getuid(); 132 if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0') 133 xsnprintf(base, sizeof base, "%s/", s); 134 else if ((s = getenv("TMPDIR")) != NULL && *s != '\0') 135 xsnprintf(base, sizeof base, "%s/tmux-%u", s, uid); 136 else 137 xsnprintf(base, sizeof base, "%s/tmux-%u", _PATH_TMP, uid); 138 139 if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST) 140 return (NULL); 141 142 if (lstat(base, &sb) != 0) 143 return (NULL); 144 if (!S_ISDIR(sb.st_mode)) { 145 errno = ENOTDIR; 146 return (NULL); 147 } 148 if (sb.st_uid != uid || (!S_ISDIR(sb.st_mode) && 149 sb.st_mode & (S_IRWXG|S_IRWXO)) != 0) { 150 errno = EACCES; 151 return (NULL); 152 } 153 154 if (realpath(base, realbase) == NULL) 155 strlcpy(realbase, base, sizeof realbase); 156 157 xasprintf(&path, "%s/%s", realbase, label); 158 return (path); 159 } 160 161 void 162 setblocking(int fd, int state) 163 { 164 int mode; 165 166 if ((mode = fcntl(fd, F_GETFL)) != -1) { 167 if (!state) 168 mode |= O_NONBLOCK; 169 else 170 mode &= ~O_NONBLOCK; 171 fcntl(fd, F_SETFL, mode); 172 } 173 } 174 175 __dead void 176 shell_exec(const char *shell, const char *shellcmd) 177 { 178 const char *shellname, *ptr; 179 char *argv0; 180 181 ptr = strrchr(shell, '/'); 182 if (ptr != NULL && *(ptr + 1) != '\0') 183 shellname = ptr + 1; 184 else 185 shellname = shell; 186 if (login_shell) 187 xasprintf(&argv0, "-%s", shellname); 188 else 189 xasprintf(&argv0, "%s", shellname); 190 setenv("SHELL", shell, 1); 191 192 setblocking(STDIN_FILENO, 1); 193 setblocking(STDOUT_FILENO, 1); 194 setblocking(STDERR_FILENO, 1); 195 closefrom(STDERR_FILENO + 1); 196 197 execl(shell, argv0, "-c", shellcmd, (char *) NULL); 198 fatal("execl failed"); 199 } 200 201 int 202 main(int argc, char **argv) 203 { 204 struct passwd *pw; 205 char *s, *path, *label, **var, tmp[MAXPATHLEN]; 206 char in[256]; 207 const char *home; 208 long long pid; 209 int opt, flags, quiet, keys, session; 210 211 #ifdef DEBUG 212 malloc_options = (char *) "AFGJPX"; 213 #endif 214 215 setlocale(LC_TIME, ""); 216 217 quiet = flags = 0; 218 label = path = NULL; 219 login_shell = (**argv == '-'); 220 while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUv")) != -1) { 221 switch (opt) { 222 case '2': 223 flags |= CLIENT_256COLOURS; 224 break; 225 case 'c': 226 free(shell_cmd); 227 shell_cmd = xstrdup(optarg); 228 break; 229 case 'C': 230 if (flags & CLIENT_CONTROL) 231 flags |= CLIENT_CONTROLCONTROL; 232 else 233 flags |= CLIENT_CONTROL; 234 break; 235 case 'f': 236 free(cfg_file); 237 cfg_file = xstrdup(optarg); 238 break; 239 case 'l': 240 login_shell = 1; 241 break; 242 case 'L': 243 free(label); 244 label = xstrdup(optarg); 245 break; 246 case 'q': 247 quiet = 1; 248 break; 249 case 'S': 250 free(path); 251 path = xstrdup(optarg); 252 break; 253 case 'u': 254 flags |= CLIENT_UTF8; 255 break; 256 case 'v': 257 debug_level++; 258 break; 259 default: 260 usage(); 261 } 262 } 263 argc -= optind; 264 argv += optind; 265 266 if (shell_cmd != NULL && argc != 0) 267 usage(); 268 269 if (!(flags & CLIENT_UTF8)) { 270 /* 271 * If the user has set whichever of LC_ALL, LC_CTYPE or LANG 272 * exist (in that order) to contain UTF-8, it is a safe 273 * assumption that either they are using a UTF-8 terminal, or 274 * if not they know that output from UTF-8-capable programs may 275 * be wrong. 276 */ 277 if ((s = getenv("LC_ALL")) == NULL || *s == '\0') { 278 if ((s = getenv("LC_CTYPE")) == NULL || *s == '\0') 279 s = getenv("LANG"); 280 } 281 if (s != NULL && (strcasestr(s, "UTF-8") != NULL || 282 strcasestr(s, "UTF8") != NULL)) 283 flags |= CLIENT_UTF8; 284 } 285 286 environ_init(&global_environ); 287 for (var = environ; *var != NULL; var++) 288 environ_put(&global_environ, *var); 289 if (getcwd(tmp, sizeof tmp) != NULL) 290 environ_set(&global_environ, "PWD", tmp); 291 292 options_init(&global_options, NULL); 293 options_table_populate_tree(server_options_table, &global_options); 294 options_set_number(&global_options, "quiet", quiet); 295 296 options_init(&global_s_options, NULL); 297 options_table_populate_tree(session_options_table, &global_s_options); 298 options_set_string(&global_s_options, "default-shell", "%s", getshell()); 299 300 options_init(&global_w_options, NULL); 301 options_table_populate_tree(window_options_table, &global_w_options); 302 303 /* Enable UTF-8 if the first client is on UTF-8 terminal. */ 304 if (flags & CLIENT_UTF8) { 305 options_set_number(&global_s_options, "status-utf8", 1); 306 options_set_number(&global_s_options, "mouse-utf8", 1); 307 options_set_number(&global_w_options, "utf8", 1); 308 } 309 310 /* Override keys to vi if VISUAL or EDITOR are set. */ 311 if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) { 312 if (strrchr(s, '/') != NULL) 313 s = strrchr(s, '/') + 1; 314 if (strstr(s, "vi") != NULL) 315 keys = MODEKEY_VI; 316 else 317 keys = MODEKEY_EMACS; 318 options_set_number(&global_s_options, "status-keys", keys); 319 options_set_number(&global_w_options, "mode-keys", keys); 320 } 321 322 /* Locate the configuration file. */ 323 if (cfg_file == NULL) { 324 home = getenv("HOME"); 325 if (home == NULL || *home == '\0') { 326 pw = getpwuid(getuid()); 327 if (pw != NULL) 328 home = pw->pw_dir; 329 else 330 home = NULL; 331 } 332 if (home != NULL) { 333 xasprintf(&cfg_file, "%s/.tmux.conf", home); 334 if (access(cfg_file, R_OK) != 0 && errno == ENOENT) { 335 free(cfg_file); 336 cfg_file = NULL; 337 } 338 } 339 } 340 341 /* Get path from environment. */ 342 s = getenv("TMUX"); 343 if (s != NULL && sscanf(s, "%255[^,],%lld,%d", in, &pid, &session) == 3) 344 environ_path = xstrdup(in); 345 346 /* 347 * Figure out the socket path. If specified on the command-line with -S 348 * or -L, use it, otherwise try $TMUX or assume -L default. 349 */ 350 if (path == NULL) { 351 /* If no -L, use the environment. */ 352 if (label == NULL) { 353 if (environ_path != NULL) 354 path = xstrdup(environ_path); 355 else 356 label = xstrdup("default"); 357 } 358 359 /* -L or default set. */ 360 if (label != NULL) { 361 if ((path = makesocketpath(label)) == NULL) { 362 fprintf(stderr, "can't create socket: %s\n", 363 strerror(errno)); 364 exit(1); 365 } 366 } 367 } 368 free(label); 369 370 if (strlcpy(socket_path, path, sizeof socket_path) >= sizeof socket_path) { 371 fprintf(stderr, "socket path too long: %s\n", path); 372 exit(1); 373 } 374 free(path); 375 376 /* Set process title. */ 377 setproctitle("%s (%s)", __progname, socket_path); 378 379 /* Pass control to the client. */ 380 ev_base = event_init(); 381 exit(client_main(argc, argv, flags)); 382 } 383