1 /* $OpenBSD$ */ 2 3 /* 4 * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com> 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 #include <sys/utsname.h> 22 23 #include <errno.h> 24 #include <event.h> 25 #include <fcntl.h> 26 #include <langinfo.h> 27 #include <locale.h> 28 #include <pwd.h> 29 #include <stdlib.h> 30 #include <string.h> 31 #include <time.h> 32 #include <unistd.h> 33 34 #include "tmux.h" 35 36 struct options *global_options; /* server options */ 37 struct options *global_s_options; /* session options */ 38 struct options *global_w_options; /* window options */ 39 struct environ *global_environ; 40 41 struct timeval start_time; 42 const char *socket_path; 43 int ptm_fd = -1; 44 const char *shell_command; 45 46 static __dead void usage(void); 47 static char *make_label(const char *, char **); 48 49 static const char *getshell(void); 50 static int checkshell(const char *); 51 52 static __dead void 53 usage(void) 54 { 55 fprintf(stderr, 56 "usage: %s [-2CluvV] [-c shell-command] [-f file] [-L socket-name]\n" 57 " [-S socket-path] [command [flags]]\n", 58 getprogname()); 59 exit(1); 60 } 61 62 static const char * 63 getshell(void) 64 { 65 struct passwd *pw; 66 const char *shell; 67 68 shell = getenv("SHELL"); 69 if (checkshell(shell)) 70 return (shell); 71 72 pw = getpwuid(getuid()); 73 if (pw != NULL && checkshell(pw->pw_shell)) 74 return (pw->pw_shell); 75 76 return (_PATH_BSHELL); 77 } 78 79 static int 80 checkshell(const char *shell) 81 { 82 if (shell == NULL || *shell != '/') 83 return (0); 84 if (areshell(shell)) 85 return (0); 86 if (access(shell, X_OK) != 0) 87 return (0); 88 return (1); 89 } 90 91 int 92 areshell(const char *shell) 93 { 94 const char *progname, *ptr; 95 96 if ((ptr = strrchr(shell, '/')) != NULL) 97 ptr++; 98 else 99 ptr = shell; 100 progname = getprogname(); 101 if (*progname == '-') 102 progname++; 103 if (strcmp(ptr, progname) == 0) 104 return (1); 105 return (0); 106 } 107 108 static char * 109 make_label(const char *label, char **cause) 110 { 111 char *base, resolved[PATH_MAX], *path, *s; 112 struct stat sb; 113 uid_t uid; 114 115 *cause = NULL; 116 117 if (label == NULL) 118 label = "default"; 119 uid = getuid(); 120 121 if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0') 122 xasprintf(&base, "%s/tmux-%ld", s, (long)uid); 123 else 124 xasprintf(&base, "%s/tmux-%ld", _PATH_TMP, (long)uid); 125 if (realpath(base, resolved) == NULL && 126 strlcpy(resolved, base, sizeof resolved) >= sizeof resolved) { 127 errno = ERANGE; 128 free(base); 129 goto fail; 130 } 131 free(base); 132 133 if (mkdir(resolved, S_IRWXU) != 0 && errno != EEXIST) 134 goto fail; 135 if (lstat(resolved, &sb) != 0) 136 goto fail; 137 if (!S_ISDIR(sb.st_mode)) { 138 errno = ENOTDIR; 139 goto fail; 140 } 141 if (sb.st_uid != uid || (sb.st_mode & S_IRWXO) != 0) { 142 errno = EACCES; 143 goto fail; 144 } 145 xasprintf(&path, "%s/%s", resolved, label); 146 return (path); 147 148 fail: 149 xasprintf(cause, "error creating %s (%s)", resolved, strerror(errno)); 150 return (NULL); 151 } 152 153 void 154 setblocking(int fd, int state) 155 { 156 int mode; 157 158 if ((mode = fcntl(fd, F_GETFL)) != -1) { 159 if (!state) 160 mode |= O_NONBLOCK; 161 else 162 mode &= ~O_NONBLOCK; 163 fcntl(fd, F_SETFL, mode); 164 } 165 } 166 167 const char * 168 find_cwd(void) 169 { 170 char resolved1[PATH_MAX], resolved2[PATH_MAX]; 171 static char cwd[PATH_MAX]; 172 const char *pwd; 173 174 if (getcwd(cwd, sizeof cwd) == NULL) 175 return (NULL); 176 if ((pwd = getenv("PWD")) == NULL || *pwd == '\0') 177 return (cwd); 178 179 /* 180 * We want to use PWD so that symbolic links are maintained, 181 * but only if it matches the actual working directory. 182 */ 183 if (realpath(pwd, resolved1) == NULL) 184 return (cwd); 185 if (realpath(cwd, resolved2) == NULL) 186 return (cwd); 187 if (strcmp(resolved1, resolved2) != 0) 188 return (cwd); 189 return (pwd); 190 } 191 192 const char * 193 find_home(void) 194 { 195 struct passwd *pw; 196 static const char *home; 197 198 if (home != NULL) 199 return (home); 200 201 home = getenv("HOME"); 202 if (home == NULL || *home == '\0') { 203 pw = getpwuid(getuid()); 204 if (pw != NULL) 205 home = pw->pw_dir; 206 else 207 home = NULL; 208 } 209 210 return (home); 211 } 212 213 const char * 214 getversion(void) 215 { 216 return TMUX_VERSION; 217 } 218 219 int 220 main(int argc, char **argv) 221 { 222 char *path, *label, *cause, **var; 223 const char *s, *shell, *cwd; 224 int opt, flags, keys; 225 const struct options_table_entry *oe; 226 227 if (setlocale(LC_CTYPE, "en_US.UTF-8") == NULL && 228 setlocale(LC_CTYPE, "C.UTF-8") == NULL) { 229 if (setlocale(LC_CTYPE, "") == NULL) 230 errx(1, "invalid LC_ALL, LC_CTYPE or LANG"); 231 s = nl_langinfo(CODESET); 232 if (strcasecmp(s, "UTF-8") != 0 && strcasecmp(s, "UTF8") != 0) 233 errx(1, "need UTF-8 locale (LC_CTYPE) but have %s", s); 234 } 235 236 setlocale(LC_TIME, ""); 237 tzset(); 238 239 if (**argv == '-') 240 flags = CLIENT_LOGIN; 241 else 242 flags = 0; 243 244 label = path = NULL; 245 while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUvV")) != -1) { 246 switch (opt) { 247 case '2': 248 flags |= CLIENT_256COLOURS; 249 break; 250 case 'c': 251 shell_command = optarg; 252 break; 253 case 'C': 254 if (flags & CLIENT_CONTROL) 255 flags |= CLIENT_CONTROLCONTROL; 256 else 257 flags |= CLIENT_CONTROL; 258 break; 259 case 'f': 260 set_cfg_file(optarg); 261 break; 262 case 'V': 263 printf("%s %s\n", getprogname(), getversion()); 264 exit(0); 265 case 'l': 266 flags |= CLIENT_LOGIN; 267 break; 268 case 'L': 269 free(label); 270 label = xstrdup(optarg); 271 break; 272 case 'q': 273 break; 274 case 'S': 275 free(path); 276 path = xstrdup(optarg); 277 break; 278 case 'u': 279 flags |= CLIENT_UTF8; 280 break; 281 case 'v': 282 log_add_level(); 283 break; 284 default: 285 usage(); 286 } 287 } 288 argc -= optind; 289 argv += optind; 290 291 if (shell_command != NULL && argc != 0) 292 usage(); 293 294 if ((ptm_fd = getptmfd()) == -1) 295 err(1, "getptmfd"); 296 if (pledge("stdio rpath wpath cpath flock fattr unix getpw sendfd " 297 "recvfd proc exec tty ps", NULL) != 0) 298 err(1, "pledge"); 299 300 /* 301 * tmux is a UTF-8 terminal, so if TMUX is set, assume UTF-8. 302 * Otherwise, if the user has set LC_ALL, LC_CTYPE or LANG to contain 303 * UTF-8, it is a safe assumption that either they are using a UTF-8 304 * terminal, or if not they know that output from UTF-8-capable 305 * programs may be wrong. 306 */ 307 if (getenv("TMUX") != NULL) 308 flags |= CLIENT_UTF8; 309 else { 310 s = getenv("LC_ALL"); 311 if (s == NULL || *s == '\0') 312 s = getenv("LC_CTYPE"); 313 if (s == NULL || *s == '\0') 314 s = getenv("LANG"); 315 if (s == NULL || *s == '\0') 316 s = ""; 317 if (strcasestr(s, "UTF-8") != NULL || 318 strcasestr(s, "UTF8") != NULL) 319 flags |= CLIENT_UTF8; 320 } 321 322 global_environ = environ_create(); 323 for (var = environ; *var != NULL; var++) 324 environ_put(global_environ, *var); 325 if ((cwd = find_cwd()) != NULL) 326 environ_set(global_environ, "PWD", "%s", cwd); 327 328 global_options = options_create(NULL); 329 global_s_options = options_create(NULL); 330 global_w_options = options_create(NULL); 331 for (oe = options_table; oe->name != NULL; oe++) { 332 if (oe->scope & OPTIONS_TABLE_SERVER) 333 options_default(global_options, oe); 334 if (oe->scope & OPTIONS_TABLE_SESSION) 335 options_default(global_s_options, oe); 336 if (oe->scope & OPTIONS_TABLE_WINDOW) 337 options_default(global_w_options, oe); 338 } 339 340 /* 341 * The default shell comes from SHELL or from the user's passwd entry 342 * if available. 343 */ 344 shell = getshell(); 345 options_set_string(global_s_options, "default-shell", 0, "%s", shell); 346 347 /* Override keys to vi if VISUAL or EDITOR are set. */ 348 if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) { 349 if (strrchr(s, '/') != NULL) 350 s = strrchr(s, '/') + 1; 351 if (strstr(s, "vi") != NULL) 352 keys = MODEKEY_VI; 353 else 354 keys = MODEKEY_EMACS; 355 options_set_number(global_s_options, "status-keys", keys); 356 options_set_number(global_w_options, "mode-keys", keys); 357 } 358 359 /* 360 * If socket is specified on the command-line with -S or -L, it is 361 * used. Otherwise, $TMUX is checked and if that fails "default" is 362 * used. 363 */ 364 if (path == NULL && label == NULL) { 365 s = getenv("TMUX"); 366 if (s != NULL && *s != '\0' && *s != ',') { 367 path = xstrdup(s); 368 path[strcspn(path, ",")] = '\0'; 369 } 370 } 371 if (path == NULL && (path = make_label(label, &cause)) == NULL) { 372 if (cause != NULL) { 373 fprintf(stderr, "%s\n", cause); 374 free(cause); 375 } 376 exit(1); 377 } 378 socket_path = path; 379 free(label); 380 381 /* Pass control to the client. */ 382 exit(client_main(osdep_event_init(), argc, argv, flags)); 383 } 384