1 /* $OpenBSD: tmux.c,v 1.147 2015/10/27 13:23:24 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 <err.h> 23 #include <errno.h> 24 #include <event.h> 25 #include <fcntl.h> 26 #include <getopt.h> 27 #include <locale.h> 28 #include <paths.h> 29 #include <pwd.h> 30 #include <stdlib.h> 31 #include <string.h> 32 #include <time.h> 33 #include <unistd.h> 34 35 #include "tmux.h" 36 37 #ifdef DEBUG 38 extern char *malloc_options; 39 #endif 40 41 struct options global_options; /* server options */ 42 struct options global_s_options; /* session options */ 43 struct options global_w_options; /* window options */ 44 struct environ global_environ; 45 46 char *shell_cmd; 47 int debug_level; 48 time_t start_time; 49 char socket_path[PATH_MAX]; 50 51 __dead void usage(void); 52 char *makesocketpath(const char *); 53 54 __dead void 55 usage(void) 56 { 57 fprintf(stderr, 58 "usage: %s [-2Cluv] [-c shell-command] [-f file] [-L socket-name]\n" 59 " [-S socket-path] [command [flags]]\n", 60 __progname); 61 exit(1); 62 } 63 64 void 65 logfile(const char *name) 66 { 67 char *path; 68 69 if (debug_level > 0) { 70 xasprintf(&path, "tmux-%s-%ld.log", name, (long) getpid()); 71 log_open(path); 72 free(path); 73 } 74 } 75 76 const char * 77 getshell(void) 78 { 79 struct passwd *pw; 80 const char *shell; 81 82 shell = getenv("SHELL"); 83 if (checkshell(shell)) 84 return (shell); 85 86 pw = getpwuid(getuid()); 87 if (pw != NULL && checkshell(pw->pw_shell)) 88 return (pw->pw_shell); 89 90 return (_PATH_BSHELL); 91 } 92 93 int 94 checkshell(const char *shell) 95 { 96 if (shell == NULL || *shell == '\0' || *shell != '/') 97 return (0); 98 if (areshell(shell)) 99 return (0); 100 if (access(shell, X_OK) != 0) 101 return (0); 102 return (1); 103 } 104 105 int 106 areshell(const char *shell) 107 { 108 const char *progname, *ptr; 109 110 if ((ptr = strrchr(shell, '/')) != NULL) 111 ptr++; 112 else 113 ptr = shell; 114 progname = __progname; 115 if (*progname == '-') 116 progname++; 117 if (strcmp(ptr, progname) == 0) 118 return (1); 119 return (0); 120 } 121 122 char * 123 makesocketpath(const char *label) 124 { 125 char base[PATH_MAX], realbase[PATH_MAX], *path, *s; 126 struct stat sb; 127 u_int uid; 128 129 uid = getuid(); 130 if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0') 131 xsnprintf(base, sizeof base, "%s/tmux-%u", s, uid); 132 else 133 xsnprintf(base, sizeof base, "%s/tmux-%u", _PATH_TMP, uid); 134 135 if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST) 136 return (NULL); 137 138 if (lstat(base, &sb) != 0) 139 return (NULL); 140 if (!S_ISDIR(sb.st_mode)) { 141 errno = ENOTDIR; 142 return (NULL); 143 } 144 if (sb.st_uid != uid || (sb.st_mode & S_IRWXO) != 0) { 145 errno = EACCES; 146 return (NULL); 147 } 148 149 if (realpath(base, realbase) == NULL) 150 strlcpy(realbase, base, sizeof realbase); 151 152 xasprintf(&path, "%s/%s", realbase, label); 153 return (path); 154 } 155 156 void 157 setblocking(int fd, int state) 158 { 159 int mode; 160 161 if ((mode = fcntl(fd, F_GETFL)) != -1) { 162 if (!state) 163 mode |= O_NONBLOCK; 164 else 165 mode &= ~O_NONBLOCK; 166 fcntl(fd, F_SETFL, mode); 167 } 168 } 169 170 const char * 171 find_home(void) 172 { 173 struct passwd *pw; 174 static const char *home; 175 176 if (home != NULL) 177 return (home); 178 179 home = getenv("HOME"); 180 if (home == NULL || *home == '\0') { 181 pw = getpwuid(getuid()); 182 if (pw != NULL) 183 home = pw->pw_dir; 184 else 185 home = NULL; 186 } 187 188 return (home); 189 } 190 191 int 192 main(int argc, char **argv) 193 { 194 char *s, *path, *label, **var, tmp[PATH_MAX]; 195 int opt, flags, keys; 196 197 #ifdef DEBUG 198 malloc_options = (char *) "AFGJPX"; 199 #endif 200 201 setlocale(LC_TIME, ""); 202 tzset(); 203 204 if (**argv == '-') 205 flags = CLIENT_LOGIN; 206 else 207 flags = 0; 208 209 label = path = NULL; 210 while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUv")) != -1) { 211 switch (opt) { 212 case '2': 213 flags |= CLIENT_256COLOURS; 214 break; 215 case 'c': 216 free(shell_cmd); 217 shell_cmd = xstrdup(optarg); 218 break; 219 case 'C': 220 if (flags & CLIENT_CONTROL) 221 flags |= CLIENT_CONTROLCONTROL; 222 else 223 flags |= CLIENT_CONTROL; 224 break; 225 case 'f': 226 set_cfg_file(optarg); 227 break; 228 case 'l': 229 flags |= CLIENT_LOGIN; 230 break; 231 case 'L': 232 free(label); 233 label = xstrdup(optarg); 234 break; 235 case 'q': 236 break; 237 case 'S': 238 free(path); 239 path = xstrdup(optarg); 240 break; 241 case 'u': 242 flags |= CLIENT_UTF8; 243 break; 244 case 'v': 245 debug_level++; 246 break; 247 default: 248 usage(); 249 } 250 } 251 argc -= optind; 252 argv += optind; 253 254 if (shell_cmd != NULL && argc != 0) 255 usage(); 256 257 if (pledge("stdio rpath wpath cpath flock fattr unix sendfd recvfd " 258 "proc exec tty ps", NULL) != 0) 259 err(1, "pledge"); 260 261 if (!(flags & CLIENT_UTF8)) { 262 /* 263 * If the user has set whichever of LC_ALL, LC_CTYPE or LANG 264 * exist (in that order) to contain UTF-8, it is a safe 265 * assumption that either they are using a UTF-8 terminal, or 266 * if not they know that output from UTF-8-capable programs may 267 * be wrong. 268 */ 269 if ((s = getenv("LC_ALL")) == NULL || *s == '\0') { 270 if ((s = getenv("LC_CTYPE")) == NULL || *s == '\0') 271 s = getenv("LANG"); 272 } 273 if (s != NULL && (strcasestr(s, "UTF-8") != NULL || 274 strcasestr(s, "UTF8") != NULL)) 275 flags |= CLIENT_UTF8; 276 } 277 278 environ_init(&global_environ); 279 for (var = environ; *var != NULL; var++) 280 environ_put(&global_environ, *var); 281 if (getcwd(tmp, sizeof tmp) != NULL) 282 environ_set(&global_environ, "PWD", tmp); 283 284 options_init(&global_options, NULL); 285 options_table_populate_tree(server_options_table, &global_options); 286 287 options_init(&global_s_options, NULL); 288 options_table_populate_tree(session_options_table, &global_s_options); 289 options_set_string(&global_s_options, "default-shell", "%s", 290 getshell()); 291 292 options_init(&global_w_options, NULL); 293 options_table_populate_tree(window_options_table, &global_w_options); 294 295 /* Enable UTF-8 if the first client is on UTF-8 terminal. */ 296 if (flags & CLIENT_UTF8) { 297 options_set_number(&global_s_options, "status-utf8", 1); 298 options_set_number(&global_s_options, "mouse-utf8", 1); 299 options_set_number(&global_w_options, "utf8", 1); 300 } 301 302 /* Override keys to vi if VISUAL or EDITOR are set. */ 303 if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) { 304 if (strrchr(s, '/') != NULL) 305 s = strrchr(s, '/') + 1; 306 if (strstr(s, "vi") != NULL) 307 keys = MODEKEY_VI; 308 else 309 keys = MODEKEY_EMACS; 310 options_set_number(&global_s_options, "status-keys", keys); 311 options_set_number(&global_w_options, "mode-keys", keys); 312 } 313 314 /* 315 * Figure out the socket path. If specified on the command-line with -S 316 * or -L, use it, otherwise try $TMUX or assume -L default. 317 */ 318 if (path == NULL) { 319 /* If no -L, use the environment. */ 320 if (label == NULL) { 321 s = getenv("TMUX"); 322 if (s != NULL) { 323 path = xstrdup(s); 324 path[strcspn (path, ",")] = '\0'; 325 if (*path == '\0') { 326 free(path); 327 label = xstrdup("default"); 328 } 329 } else 330 label = xstrdup("default"); 331 } 332 333 /* -L or default set. */ 334 if (label != NULL) { 335 if ((path = makesocketpath(label)) == NULL) { 336 fprintf(stderr, "can't create socket: %s\n", 337 strerror(errno)); 338 exit(1); 339 } 340 } 341 } 342 free(label); 343 344 if (strlcpy(socket_path, path, sizeof socket_path) >= 345 sizeof socket_path) { 346 fprintf(stderr, "socket path too long: %s\n", path); 347 exit(1); 348 } 349 free(path); 350 351 /* Pass control to the client. */ 352 exit(client_main(event_init(), argc, argv, flags)); 353 } 354