1 /* $OpenBSD: tmux.c,v 1.184 2017/07/12 09:21:25 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 *); 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) 113 { 114 char *base, resolved[PATH_MAX], *path, *s; 115 struct stat sb; 116 uid_t uid; 117 int saved_errno; 118 119 if (label == NULL) 120 label = "default"; 121 uid = getuid(); 122 123 if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0') 124 xasprintf(&base, "%s/tmux-%ld", s, (long)uid); 125 else 126 xasprintf(&base, "%s/tmux-%ld", _PATH_TMP, (long)uid); 127 128 if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST) 129 goto fail; 130 131 if (lstat(base, &sb) != 0) 132 goto fail; 133 if (!S_ISDIR(sb.st_mode)) { 134 errno = ENOTDIR; 135 goto fail; 136 } 137 if (sb.st_uid != uid || (sb.st_mode & S_IRWXO) != 0) { 138 errno = EACCES; 139 goto fail; 140 } 141 142 if (realpath(base, resolved) == NULL) 143 strlcpy(resolved, base, sizeof resolved); 144 xasprintf(&path, "%s/%s", resolved, label); 145 146 free(base); 147 return (path); 148 149 fail: 150 saved_errno = errno; 151 free(base); 152 errno = saved_errno; 153 return (NULL); 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 *path, *label, **var; 195 char tmp[PATH_MAX]; 196 const char *s, *shell; 197 int opt, flags, keys; 198 const struct options_table_entry *oe; 199 200 if (setlocale(LC_CTYPE, "en_US.UTF-8") == NULL && 201 setlocale(LC_CTYPE, "C.UTF-8") == NULL) { 202 if (setlocale(LC_CTYPE, "") == NULL) 203 errx(1, "invalid LC_ALL, LC_CTYPE or LANG"); 204 s = nl_langinfo(CODESET); 205 if (strcasecmp(s, "UTF-8") != 0 && strcasecmp(s, "UTF8") != 0) 206 errx(1, "need UTF-8 locale (LC_CTYPE) but have %s", s); 207 } 208 209 setlocale(LC_TIME, ""); 210 tzset(); 211 212 if (**argv == '-') 213 flags = CLIENT_LOGIN; 214 else 215 flags = 0; 216 217 label = path = NULL; 218 while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUv")) != -1) { 219 switch (opt) { 220 case '2': 221 flags |= CLIENT_256COLOURS; 222 break; 223 case 'c': 224 shell_command = optarg; 225 break; 226 case 'C': 227 if (flags & CLIENT_CONTROL) 228 flags |= CLIENT_CONTROLCONTROL; 229 else 230 flags |= CLIENT_CONTROL; 231 break; 232 case 'f': 233 set_cfg_file(optarg); 234 break; 235 case 'l': 236 flags |= CLIENT_LOGIN; 237 break; 238 case 'L': 239 free(label); 240 label = xstrdup(optarg); 241 break; 242 case 'q': 243 break; 244 case 'S': 245 free(path); 246 path = xstrdup(optarg); 247 break; 248 case 'u': 249 flags |= CLIENT_UTF8; 250 break; 251 case 'v': 252 log_add_level(); 253 break; 254 default: 255 usage(); 256 } 257 } 258 argc -= optind; 259 argv += optind; 260 261 if (shell_command != NULL && argc != 0) 262 usage(); 263 264 if ((ptm_fd = getptmfd()) == -1) 265 err(1, "getptmfd"); 266 if (pledge("stdio rpath wpath cpath flock fattr unix getpw sendfd " 267 "recvfd proc exec tty ps", NULL) != 0) 268 err(1, "pledge"); 269 270 /* 271 * tmux is a UTF-8 terminal, so if TMUX is set, assume UTF-8. 272 * Otherwise, if the user has set LC_ALL, LC_CTYPE or LANG to contain 273 * UTF-8, it is a safe assumption that either they are using a UTF-8 274 * terminal, or if not they know that output from UTF-8-capable 275 * programs may be wrong. 276 */ 277 if (getenv("TMUX") != NULL) 278 flags |= CLIENT_UTF8; 279 else { 280 s = getenv("LC_ALL"); 281 if (s == NULL || *s == '\0') 282 s = getenv("LC_CTYPE"); 283 if (s == NULL || *s == '\0') 284 s = getenv("LANG"); 285 if (s == NULL || *s == '\0') 286 s = ""; 287 if (strcasestr(s, "UTF-8") != NULL || 288 strcasestr(s, "UTF8") != NULL) 289 flags |= CLIENT_UTF8; 290 } 291 292 global_hooks = hooks_create(NULL); 293 294 global_environ = environ_create(); 295 for (var = environ; *var != NULL; var++) 296 environ_put(global_environ, *var); 297 if (getcwd(tmp, sizeof tmp) != NULL) 298 environ_set(global_environ, "PWD", "%s", tmp); 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)) == NULL) { 344 fprintf(stderr, "can't create socket: %s\n", strerror(errno)); 345 exit(1); 346 } 347 socket_path = path; 348 free(label); 349 350 /* Pass control to the client. */ 351 exit(client_main(event_init(), argc, argv, flags)); 352 } 353