1 /* $OpenBSD: tmux.c,v 1.141 2015/08/30 22:56:36 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 <getopt.h> 26 #include <locale.h> 27 #include <paths.h> 28 #include <pwd.h> 29 #include <stdlib.h> 30 #include <string.h> 31 #include <unistd.h> 32 33 #include "tmux.h" 34 35 #ifdef DEBUG 36 extern char *malloc_options; 37 #endif 38 39 struct options global_options; /* server options */ 40 struct options global_s_options; /* session options */ 41 struct options global_w_options; /* window options */ 42 struct environ global_environ; 43 44 char *cfg_file; 45 char *shell_cmd; 46 int debug_level; 47 time_t start_time; 48 char socket_path[PATH_MAX]; 49 50 __dead void usage(void); 51 char *makesocketpath(const char *); 52 53 __dead void 54 usage(void) 55 { 56 fprintf(stderr, 57 "usage: %s [-2Cluv] [-c shell-command] [-f file] [-L socket-name]\n" 58 " [-S socket-path] [command [flags]]\n", 59 __progname); 60 exit(1); 61 } 62 63 void 64 logfile(const char *name) 65 { 66 char *path; 67 68 if (debug_level > 0) { 69 xasprintf(&path, "tmux-%s-%ld.log", name, (long) getpid()); 70 log_open(path); 71 free(path); 72 } 73 } 74 75 const char * 76 getshell(void) 77 { 78 struct passwd *pw; 79 const char *shell; 80 81 shell = getenv("SHELL"); 82 if (checkshell(shell)) 83 return (shell); 84 85 pw = getpwuid(getuid()); 86 if (pw != NULL && checkshell(pw->pw_shell)) 87 return (pw->pw_shell); 88 89 return (_PATH_BSHELL); 90 } 91 92 int 93 checkshell(const char *shell) 94 { 95 if (shell == NULL || *shell == '\0' || *shell != '/') 96 return (0); 97 if (areshell(shell)) 98 return (0); 99 if (access(shell, X_OK) != 0) 100 return (0); 101 return (1); 102 } 103 104 int 105 areshell(const char *shell) 106 { 107 const char *progname, *ptr; 108 109 if ((ptr = strrchr(shell, '/')) != NULL) 110 ptr++; 111 else 112 ptr = shell; 113 progname = __progname; 114 if (*progname == '-') 115 progname++; 116 if (strcmp(ptr, progname) == 0) 117 return (1); 118 return (0); 119 } 120 121 char * 122 makesocketpath(const char *label) 123 { 124 char base[PATH_MAX], realbase[PATH_MAX], *path, *s; 125 struct stat sb; 126 u_int uid; 127 128 uid = getuid(); 129 if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0') 130 xsnprintf(base, sizeof base, "%s/tmux-%u", s, uid); 131 else if ((s = getenv("TMPDIR")) != NULL && *s != '\0') 132 xsnprintf(base, sizeof base, "%s/tmux-%u", s, uid); 133 else 134 xsnprintf(base, sizeof base, "%s/tmux-%u", _PATH_TMP, uid); 135 136 if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST) 137 return (NULL); 138 139 if (lstat(base, &sb) != 0) 140 return (NULL); 141 if (!S_ISDIR(sb.st_mode)) { 142 errno = ENOTDIR; 143 return (NULL); 144 } 145 if (sb.st_uid != uid || (sb.st_mode & S_IRWXO) != 0) { 146 errno = EACCES; 147 return (NULL); 148 } 149 150 if (realpath(base, realbase) == NULL) 151 strlcpy(realbase, base, sizeof realbase); 152 153 xasprintf(&path, "%s/%s", realbase, label); 154 return (path); 155 } 156 157 void 158 setblocking(int fd, int state) 159 { 160 int mode; 161 162 if ((mode = fcntl(fd, F_GETFL)) != -1) { 163 if (!state) 164 mode |= O_NONBLOCK; 165 else 166 mode &= ~O_NONBLOCK; 167 fcntl(fd, F_SETFL, mode); 168 } 169 } 170 171 const char * 172 find_home(void) 173 { 174 struct passwd *pw; 175 const char *home; 176 177 home = getenv("HOME"); 178 if (home == NULL || *home == '\0') { 179 pw = getpwuid(getuid()); 180 if (pw != NULL) 181 home = pw->pw_dir; 182 else 183 home = NULL; 184 } 185 186 return (home); 187 } 188 189 int 190 main(int argc, char **argv) 191 { 192 char *s, *path, *label, **var, tmp[PATH_MAX]; 193 const char *home; 194 int opt, flags, keys; 195 196 #ifdef DEBUG 197 malloc_options = (char *) "AFGJPX"; 198 #endif 199 200 setlocale(LC_TIME, ""); 201 202 if (**argv == '-') 203 flags = CLIENT_LOGIN; 204 else 205 flags = 0; 206 207 label = path = NULL; 208 while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUv")) != -1) { 209 switch (opt) { 210 case '2': 211 flags |= CLIENT_256COLOURS; 212 break; 213 case 'c': 214 free(shell_cmd); 215 shell_cmd = xstrdup(optarg); 216 break; 217 case 'C': 218 if (flags & CLIENT_CONTROL) 219 flags |= CLIENT_CONTROLCONTROL; 220 else 221 flags |= CLIENT_CONTROL; 222 break; 223 case 'f': 224 free(cfg_file); 225 cfg_file = xstrdup(optarg); 226 break; 227 case 'l': 228 flags |= CLIENT_LOGIN; 229 break; 230 case 'L': 231 free(label); 232 label = xstrdup(optarg); 233 break; 234 case 'q': 235 break; 236 case 'S': 237 free(path); 238 path = xstrdup(optarg); 239 break; 240 case 'u': 241 flags |= CLIENT_UTF8; 242 break; 243 case 'v': 244 debug_level++; 245 break; 246 default: 247 usage(); 248 } 249 } 250 argc -= optind; 251 argv += optind; 252 253 if (shell_cmd != NULL && argc != 0) 254 usage(); 255 256 if (!(flags & CLIENT_UTF8)) { 257 /* 258 * If the user has set whichever of LC_ALL, LC_CTYPE or LANG 259 * exist (in that order) to contain UTF-8, it is a safe 260 * assumption that either they are using a UTF-8 terminal, or 261 * if not they know that output from UTF-8-capable programs may 262 * be wrong. 263 */ 264 if ((s = getenv("LC_ALL")) == NULL || *s == '\0') { 265 if ((s = getenv("LC_CTYPE")) == NULL || *s == '\0') 266 s = getenv("LANG"); 267 } 268 if (s != NULL && (strcasestr(s, "UTF-8") != NULL || 269 strcasestr(s, "UTF8") != NULL)) 270 flags |= CLIENT_UTF8; 271 } 272 273 environ_init(&global_environ); 274 for (var = environ; *var != NULL; var++) 275 environ_put(&global_environ, *var); 276 if (getcwd(tmp, sizeof tmp) != NULL) 277 environ_set(&global_environ, "PWD", tmp); 278 279 options_init(&global_options, NULL); 280 options_table_populate_tree(server_options_table, &global_options); 281 282 options_init(&global_s_options, NULL); 283 options_table_populate_tree(session_options_table, &global_s_options); 284 options_set_string(&global_s_options, "default-shell", "%s", 285 getshell()); 286 287 options_init(&global_w_options, NULL); 288 options_table_populate_tree(window_options_table, &global_w_options); 289 290 /* Enable UTF-8 if the first client is on UTF-8 terminal. */ 291 if (flags & CLIENT_UTF8) { 292 options_set_number(&global_s_options, "status-utf8", 1); 293 options_set_number(&global_s_options, "mouse-utf8", 1); 294 options_set_number(&global_w_options, "utf8", 1); 295 } 296 297 /* Override keys to vi if VISUAL or EDITOR are set. */ 298 if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) { 299 if (strrchr(s, '/') != NULL) 300 s = strrchr(s, '/') + 1; 301 if (strstr(s, "vi") != NULL) 302 keys = MODEKEY_VI; 303 else 304 keys = MODEKEY_EMACS; 305 options_set_number(&global_s_options, "status-keys", keys); 306 options_set_number(&global_w_options, "mode-keys", keys); 307 } 308 309 /* Locate the configuration file. */ 310 if (cfg_file == NULL) { 311 home = find_home(); 312 if (home != NULL) { 313 xasprintf(&cfg_file, "%s/.tmux.conf", home); 314 if (access(cfg_file, R_OK) != 0 && errno == ENOENT) { 315 free(cfg_file); 316 cfg_file = NULL; 317 } 318 } 319 } 320 321 /* 322 * Figure out the socket path. If specified on the command-line with -S 323 * or -L, use it, otherwise try $TMUX or assume -L default. 324 */ 325 if (path == NULL) { 326 /* If no -L, use the environment. */ 327 if (label == NULL) { 328 s = getenv("TMUX"); 329 if (s != NULL) { 330 path = xstrdup(s); 331 path[strcspn (path, ",")] = '\0'; 332 if (*path == '\0') { 333 free(path); 334 label = xstrdup("default"); 335 } 336 } 337 else 338 label = xstrdup("default"); 339 } 340 341 /* -L or default set. */ 342 if (label != NULL) { 343 if ((path = makesocketpath(label)) == NULL) { 344 fprintf(stderr, "can't create socket: %s\n", 345 strerror(errno)); 346 exit(1); 347 } 348 } 349 } 350 free(label); 351 352 if (strlcpy(socket_path, path, sizeof socket_path) >= 353 sizeof socket_path) { 354 fprintf(stderr, "socket path too long: %s\n", path); 355 exit(1); 356 } 357 free(path); 358 359 /* Set process title. */ 360 setproctitle("%s (%s)", __progname, socket_path); 361 362 /* Pass control to the client. */ 363 exit(client_main(event_init(), argc, argv, flags)); 364 } 365