1 /* $OpenBSD: tmux.c,v 1.186 2018/01/12 10:22:02 nicm Exp $ */ 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 22 #include <err.h> 23 #include <errno.h> 24 #include <event.h> 25 #include <fcntl.h> 26 #include <langinfo.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 #include <util.h> 35 36 #include "tmux.h" 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 struct hooks *global_hooks; 43 44 struct timeval start_time; 45 const char *socket_path; 46 int ptm_fd = -1; 47 const char *shell_command; 48 49 static __dead void usage(void); 50 static char *make_label(const char *, char **); 51 52 static const char *getshell(void); 53 static int checkshell(const char *); 54 55 static __dead void 56 usage(void) 57 { 58 fprintf(stderr, 59 "usage: %s [-2Cluv] [-c shell-command] [-f file] [-L socket-name]\n" 60 " [-S socket-path] [command [flags]]\n", 61 getprogname()); 62 exit(1); 63 } 64 65 static const char * 66 getshell(void) 67 { 68 struct passwd *pw; 69 const char *shell; 70 71 shell = getenv("SHELL"); 72 if (checkshell(shell)) 73 return (shell); 74 75 pw = getpwuid(getuid()); 76 if (pw != NULL && checkshell(pw->pw_shell)) 77 return (pw->pw_shell); 78 79 return (_PATH_BSHELL); 80 } 81 82 static int 83 checkshell(const char *shell) 84 { 85 if (shell == NULL || *shell != '/') 86 return (0); 87 if (areshell(shell)) 88 return (0); 89 if (access(shell, X_OK) != 0) 90 return (0); 91 return (1); 92 } 93 94 int 95 areshell(const char *shell) 96 { 97 const char *progname, *ptr; 98 99 if ((ptr = strrchr(shell, '/')) != NULL) 100 ptr++; 101 else 102 ptr = shell; 103 progname = getprogname(); 104 if (*progname == '-') 105 progname++; 106 if (strcmp(ptr, progname) == 0) 107 return (1); 108 return (0); 109 } 110 111 static char * 112 make_label(const char *label, char **cause) 113 { 114 char *base, resolved[PATH_MAX], *path, *s; 115 struct stat sb; 116 uid_t uid; 117 118 *cause = NULL; 119 120 if (label == NULL) 121 label = "default"; 122 uid = getuid(); 123 124 if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0') 125 xasprintf(&base, "%s/tmux-%ld", s, (long)uid); 126 else 127 xasprintf(&base, "%s/tmux-%ld", _PATH_TMP, (long)uid); 128 if (realpath(base, resolved) == NULL && 129 strlcpy(resolved, base, sizeof resolved) >= sizeof resolved) { 130 errno = ERANGE; 131 free(base); 132 goto fail; 133 } 134 135 if (mkdir(resolved, S_IRWXU) != 0 && errno != EEXIST) 136 goto fail; 137 if (lstat(resolved, &sb) != 0) 138 goto fail; 139 if (!S_ISDIR(sb.st_mode)) { 140 errno = ENOTDIR; 141 goto fail; 142 } 143 if (sb.st_uid != uid || (sb.st_mode & S_IRWXO) != 0) { 144 errno = EACCES; 145 goto fail; 146 } 147 xasprintf(&path, "%s/%s", resolved, label); 148 return (path); 149 150 fail: 151 xasprintf(cause, "error creating %s (%s)", resolved, strerror(errno)); 152 return (NULL); 153 } 154 155 void 156 setblocking(int fd, int state) 157 { 158 int mode; 159 160 if ((mode = fcntl(fd, F_GETFL)) != -1) { 161 if (!state) 162 mode |= O_NONBLOCK; 163 else 164 mode &= ~O_NONBLOCK; 165 fcntl(fd, F_SETFL, mode); 166 } 167 } 168 169 const char * 170 find_home(void) 171 { 172 struct passwd *pw; 173 static const char *home; 174 175 if (home != NULL) 176 return (home); 177 178 home = getenv("HOME"); 179 if (home == NULL || *home == '\0') { 180 pw = getpwuid(getuid()); 181 if (pw != NULL) 182 home = pw->pw_dir; 183 else 184 home = NULL; 185 } 186 187 return (home); 188 } 189 190 int 191 main(int argc, char **argv) 192 { 193 char *path, *label, *cause, **var; 194 char tmp[PATH_MAX]; 195 const char *s, *shell, *cwd; 196 int opt, flags, keys; 197 const struct options_table_entry *oe; 198 199 if (setlocale(LC_CTYPE, "en_US.UTF-8") == NULL && 200 setlocale(LC_CTYPE, "C.UTF-8") == NULL) { 201 if (setlocale(LC_CTYPE, "") == NULL) 202 errx(1, "invalid LC_ALL, LC_CTYPE or LANG"); 203 s = nl_langinfo(CODESET); 204 if (strcasecmp(s, "UTF-8") != 0 && strcasecmp(s, "UTF8") != 0) 205 errx(1, "need UTF-8 locale (LC_CTYPE) but have %s", s); 206 } 207 208 setlocale(LC_TIME, ""); 209 tzset(); 210 211 if (**argv == '-') 212 flags = CLIENT_LOGIN; 213 else 214 flags = 0; 215 216 label = path = NULL; 217 while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUv")) != -1) { 218 switch (opt) { 219 case '2': 220 flags |= CLIENT_256COLOURS; 221 break; 222 case 'c': 223 shell_command = optarg; 224 break; 225 case 'C': 226 if (flags & CLIENT_CONTROL) 227 flags |= CLIENT_CONTROLCONTROL; 228 else 229 flags |= CLIENT_CONTROL; 230 break; 231 case 'f': 232 set_cfg_file(optarg); 233 break; 234 case 'l': 235 flags |= CLIENT_LOGIN; 236 break; 237 case 'L': 238 free(label); 239 label = xstrdup(optarg); 240 break; 241 case 'q': 242 break; 243 case 'S': 244 free(path); 245 path = xstrdup(optarg); 246 break; 247 case 'u': 248 flags |= CLIENT_UTF8; 249 break; 250 case 'v': 251 log_add_level(); 252 break; 253 default: 254 usage(); 255 } 256 } 257 argc -= optind; 258 argv += optind; 259 260 if (shell_command != NULL && argc != 0) 261 usage(); 262 263 if ((ptm_fd = getptmfd()) == -1) 264 err(1, "getptmfd"); 265 if (pledge("stdio rpath wpath cpath flock fattr unix getpw sendfd " 266 "recvfd proc exec tty ps", NULL) != 0) 267 err(1, "pledge"); 268 269 /* 270 * tmux is a UTF-8 terminal, so if TMUX is set, assume UTF-8. 271 * Otherwise, if the user has set LC_ALL, LC_CTYPE or LANG to contain 272 * UTF-8, it is a safe assumption that either they are using a UTF-8 273 * terminal, or if not they know that output from UTF-8-capable 274 * programs may be wrong. 275 */ 276 if (getenv("TMUX") != NULL) 277 flags |= CLIENT_UTF8; 278 else { 279 s = getenv("LC_ALL"); 280 if (s == NULL || *s == '\0') 281 s = getenv("LC_CTYPE"); 282 if (s == NULL || *s == '\0') 283 s = getenv("LANG"); 284 if (s == NULL || *s == '\0') 285 s = ""; 286 if (strcasestr(s, "UTF-8") != NULL || 287 strcasestr(s, "UTF8") != NULL) 288 flags |= CLIENT_UTF8; 289 } 290 291 global_hooks = hooks_create(NULL); 292 293 global_environ = environ_create(); 294 for (var = environ; *var != NULL; var++) 295 environ_put(global_environ, *var); 296 if ((cwd = getenv("PWD")) == NULL && 297 (cwd = getcwd(tmp, sizeof tmp)) != NULL) 298 environ_set(global_environ, "PWD", "%s", cwd); 299 300 global_options = options_create(NULL); 301 global_s_options = options_create(NULL); 302 global_w_options = options_create(NULL); 303 for (oe = options_table; oe->name != NULL; oe++) { 304 if (oe->scope == OPTIONS_TABLE_SERVER) 305 options_default(global_options, oe); 306 if (oe->scope == OPTIONS_TABLE_SESSION) 307 options_default(global_s_options, oe); 308 if (oe->scope == OPTIONS_TABLE_WINDOW) 309 options_default(global_w_options, oe); 310 } 311 312 /* 313 * The default shell comes from SHELL or from the user's passwd entry 314 * if available. 315 */ 316 shell = getshell(); 317 options_set_string(global_s_options, "default-shell", 0, "%s", shell); 318 319 /* Override keys to vi if VISUAL or EDITOR are set. */ 320 if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) { 321 if (strrchr(s, '/') != NULL) 322 s = strrchr(s, '/') + 1; 323 if (strstr(s, "vi") != NULL) 324 keys = MODEKEY_VI; 325 else 326 keys = MODEKEY_EMACS; 327 options_set_number(global_s_options, "status-keys", keys); 328 options_set_number(global_w_options, "mode-keys", keys); 329 } 330 331 /* 332 * If socket is specified on the command-line with -S or -L, it is 333 * used. Otherwise, $TMUX is checked and if that fails "default" is 334 * used. 335 */ 336 if (path == NULL && label == NULL) { 337 s = getenv("TMUX"); 338 if (s != NULL && *s != '\0' && *s != ',') { 339 path = xstrdup(s); 340 path[strcspn(path, ",")] = '\0'; 341 } 342 } 343 if (path == NULL && (path = make_label(label, &cause)) == NULL) { 344 if (cause != NULL) { 345 fprintf(stderr, "%s\n", cause); 346 free(cause); 347 } 348 exit(1); 349 } 350 socket_path = path; 351 free(label); 352 353 /* Pass control to the client. */ 354 exit(client_main(event_init(), argc, argv, flags)); 355 } 356