1 /* $OpenBSD: tmux.c,v 1.178 2017/03/21 19:28:03 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 <getopt.h> 27 #include <langinfo.h> 28 #include <locale.h> 29 #include <paths.h> 30 #include <pwd.h> 31 #include <stdlib.h> 32 #include <string.h> 33 #include <time.h> 34 #include <unistd.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 48 static __dead void usage(void); 49 static char *make_label(const char *); 50 51 static const char *getshell(void); 52 static int checkshell(const char *); 53 54 static __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 getprogname()); 61 exit(1); 62 } 63 64 static const char * 65 getshell(void) 66 { 67 struct passwd *pw; 68 const char *shell; 69 70 shell = getenv("SHELL"); 71 if (checkshell(shell)) 72 return (shell); 73 74 pw = getpwuid(getuid()); 75 if (pw != NULL && checkshell(pw->pw_shell)) 76 return (pw->pw_shell); 77 78 return (_PATH_BSHELL); 79 } 80 81 static int 82 checkshell(const char *shell) 83 { 84 if (shell == NULL || *shell != '/') 85 return (0); 86 if (areshell(shell)) 87 return (0); 88 if (access(shell, X_OK) != 0) 89 return (0); 90 return (1); 91 } 92 93 int 94 areshell(const char *shell) 95 { 96 const char *progname, *ptr; 97 98 if ((ptr = strrchr(shell, '/')) != NULL) 99 ptr++; 100 else 101 ptr = shell; 102 progname = getprogname(); 103 if (*progname == '-') 104 progname++; 105 if (strcmp(ptr, progname) == 0) 106 return (1); 107 return (0); 108 } 109 110 static char * 111 make_label(const char *label) 112 { 113 char *base, resolved[PATH_MAX], *path, *s; 114 struct stat sb; 115 uid_t uid; 116 int saved_errno; 117 118 if (label == NULL) 119 label = "default"; 120 uid = getuid(); 121 122 if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0') 123 xasprintf(&base, "%s/tmux-%u", s, uid); 124 else 125 xasprintf(&base, "%s/tmux-%ld", _PATH_TMP, (long)uid); 126 127 if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST) 128 goto fail; 129 130 if (lstat(base, &sb) != 0) 131 goto fail; 132 if (!S_ISDIR(sb.st_mode)) { 133 errno = ENOTDIR; 134 goto fail; 135 } 136 if (sb.st_uid != uid || (sb.st_mode & S_IRWXO) != 0) { 137 errno = EACCES; 138 goto fail; 139 } 140 141 if (realpath(base, resolved) == NULL) 142 strlcpy(resolved, base, sizeof resolved); 143 xasprintf(&path, "%s/%s", resolved, label); 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, tmp[PATH_MAX]; 192 char *shellcmd = NULL, **var; 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 if (setlocale(LC_CTYPE, "") == NULL) 199 errx(1, "invalid LC_ALL, LC_CTYPE or LANG"); 200 s = nl_langinfo(CODESET); 201 if (strcasecmp(s, "UTF-8") != 0 && strcasecmp(s, "UTF8") != 0) 202 errx(1, "need UTF-8 locale (LC_CTYPE) but have %s", s); 203 } 204 205 setlocale(LC_TIME, ""); 206 tzset(); 207 208 if (**argv == '-') 209 flags = CLIENT_LOGIN; 210 else 211 flags = 0; 212 213 label = path = NULL; 214 while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUv")) != -1) { 215 switch (opt) { 216 case '2': 217 flags |= CLIENT_256COLOURS; 218 break; 219 case 'c': 220 free(shellcmd); 221 shellcmd = xstrdup(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 'f': 230 set_cfg_file(optarg); 231 break; 232 case 'l': 233 flags |= CLIENT_LOGIN; 234 break; 235 case 'L': 236 free(label); 237 label = xstrdup(optarg); 238 break; 239 case 'q': 240 break; 241 case 'S': 242 free(path); 243 path = xstrdup(optarg); 244 break; 245 case 'u': 246 flags |= CLIENT_UTF8; 247 break; 248 case 'v': 249 log_add_level(); 250 break; 251 default: 252 usage(); 253 } 254 } 255 argc -= optind; 256 argv += optind; 257 258 if (shellcmd != NULL && argc != 0) 259 usage(); 260 261 if (pty_open(&ptm_fd) != 0) 262 errx(1, "open(\"/dev/ptm\""); 263 if (pledge("stdio rpath wpath cpath flock fattr unix getpw sendfd " 264 "recvfd proc exec tty ps", NULL) != 0) 265 err(1, "pledge"); 266 267 /* 268 * tmux is a UTF-8 terminal, so if TMUX is set, assume UTF-8. 269 * Otherwise, if the user has set LC_ALL, LC_CTYPE or LANG to contain 270 * UTF-8, it is a safe assumption that either they are using a UTF-8 271 * terminal, or if not they know that output from UTF-8-capable 272 * programs may be wrong. 273 */ 274 if (getenv("TMUX") != NULL) 275 flags |= CLIENT_UTF8; 276 else { 277 s = getenv("LC_ALL"); 278 if (s == NULL || *s == '\0') 279 s = getenv("LC_CTYPE"); 280 if (s == NULL || *s == '\0') 281 s = getenv("LANG"); 282 if (s == NULL || *s == '\0') 283 s = ""; 284 if (strcasestr(s, "UTF-8") != NULL || 285 strcasestr(s, "UTF8") != NULL) 286 flags |= CLIENT_UTF8; 287 } 288 289 global_hooks = hooks_create(NULL); 290 291 global_environ = environ_create(); 292 for (var = environ; *var != NULL; var++) 293 environ_put(global_environ, *var); 294 if (getcwd(tmp, sizeof tmp) != NULL) 295 environ_set(global_environ, "PWD", "%s", tmp); 296 297 global_options = options_create(NULL); 298 global_s_options = options_create(NULL); 299 global_w_options = options_create(NULL); 300 for (oe = options_table; oe->name != NULL; oe++) { 301 if (oe->scope == OPTIONS_TABLE_SERVER) 302 options_default(global_options, oe); 303 if (oe->scope == OPTIONS_TABLE_SESSION) 304 options_default(global_s_options, oe); 305 if (oe->scope == OPTIONS_TABLE_WINDOW) 306 options_default(global_w_options, oe); 307 } 308 309 /* 310 * The default shell comes from SHELL or from the user's passwd entry 311 * if available. 312 */ 313 shell = getshell(); 314 options_set_string(global_s_options, "default-shell", 0, "%s", shell); 315 316 /* Override keys to vi if VISUAL or EDITOR are set. */ 317 if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) { 318 if (strrchr(s, '/') != NULL) 319 s = strrchr(s, '/') + 1; 320 if (strstr(s, "vi") != NULL) 321 keys = MODEKEY_VI; 322 else 323 keys = MODEKEY_EMACS; 324 options_set_number(global_s_options, "status-keys", keys); 325 options_set_number(global_w_options, "mode-keys", keys); 326 } 327 328 /* 329 * If socket is specified on the command-line with -S or -L, it is 330 * used. Otherwise, $TMUX is checked and if that fails "default" is 331 * used. 332 */ 333 if (path == NULL && label == NULL) { 334 s = getenv("TMUX"); 335 if (s != NULL && *s != '\0' && *s != ',') { 336 path = xstrdup(s); 337 path[strcspn(path, ",")] = '\0'; 338 } 339 } 340 if (path == NULL && (path = make_label(label)) == NULL) { 341 fprintf(stderr, "can't create socket: %s\n", strerror(errno)); 342 exit(1); 343 } 344 socket_path = path; 345 free(label); 346 347 /* Pass control to the client. */ 348 exit(client_main(event_init(), argc, argv, flags, shellcmd)); 349 } 350