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 22 #include <errno.h> 23 #include <event.h> 24 #include <fcntl.h> 25 #include <langinfo.h> 26 #include <locale.h> 27 #include <pwd.h> 28 #include <stdlib.h> 29 #include <string.h> 30 #include <time.h> 31 #include <unistd.h> 32 33 #include "tmux.h" 34 35 struct options *global_options; /* server options */ 36 struct options *global_s_options; /* session options */ 37 struct options *global_w_options; /* window options */ 38 struct environ *global_environ; 39 struct hooks *global_hooks; 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 *); 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) 110 { 111 char *base, resolved[PATH_MAX], *path, *s; 112 struct stat sb; 113 uid_t uid; 114 int saved_errno; 115 116 if (label == NULL) 117 label = "default"; 118 uid = getuid(); 119 120 if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0') 121 xasprintf(&base, "%s/tmux-%ld", s, (long)uid); 122 else 123 xasprintf(&base, "%s/tmux-%ld", _PATH_TMP, (long)uid); 124 125 if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST) 126 goto fail; 127 128 if (lstat(base, &sb) != 0) 129 goto fail; 130 if (!S_ISDIR(sb.st_mode)) { 131 errno = ENOTDIR; 132 goto fail; 133 } 134 if (sb.st_uid != uid || (sb.st_mode & S_IRWXO) != 0) { 135 errno = EACCES; 136 goto fail; 137 } 138 139 if (realpath(base, resolved) == NULL) 140 strlcpy(resolved, base, sizeof resolved); 141 xasprintf(&path, "%s/%s", resolved, label); 142 143 free(base); 144 return (path); 145 146 fail: 147 saved_errno = errno; 148 free(base); 149 errno = saved_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_home(void) 169 { 170 struct passwd *pw; 171 static const char *home; 172 173 if (home != NULL) 174 return (home); 175 176 home = getenv("HOME"); 177 if (home == NULL || *home == '\0') { 178 pw = getpwuid(getuid()); 179 if (pw != NULL) 180 home = pw->pw_dir; 181 else 182 home = NULL; 183 } 184 185 return (home); 186 } 187 188 int 189 main(int argc, char **argv) 190 { 191 char *path, *label, **var; 192 char tmp[PATH_MAX]; 193 const char *s, *shell; 194 int opt, flags, keys; 195 const struct options_table_entry *oe; 196 197 if (setlocale(LC_CTYPE, "en_US.UTF-8") == NULL && 198 setlocale(LC_CTYPE, "C.UTF-8") == NULL) { 199 if (setlocale(LC_CTYPE, "") == NULL) 200 errx(1, "invalid LC_ALL, LC_CTYPE or LANG"); 201 s = nl_langinfo(CODESET); 202 if (strcasecmp(s, "UTF-8") != 0 && strcasecmp(s, "UTF8") != 0) 203 errx(1, "need UTF-8 locale (LC_CTYPE) but have %s", s); 204 } 205 206 setlocale(LC_TIME, ""); 207 tzset(); 208 209 if (**argv == '-') 210 flags = CLIENT_LOGIN; 211 else 212 flags = 0; 213 214 label = path = NULL; 215 while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUVv")) != -1) { 216 switch (opt) { 217 case '2': 218 flags |= CLIENT_256COLOURS; 219 break; 220 case 'c': 221 shell_command = optarg; 222 break; 223 case 'C': 224 if (flags & CLIENT_CONTROL) 225 flags |= CLIENT_CONTROLCONTROL; 226 else 227 flags |= CLIENT_CONTROL; 228 break; 229 case 'V': 230 printf("%s %s\n", getprogname(), VERSION); 231 exit(0); 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(osdep_event_init(), argc, argv, flags)); 352 } 353