1 /* $OpenBSD: tmux.c,v 1.173 2016/12/09 21:39:27 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 47 static __dead void usage(void); 48 static char *make_label(const char *); 49 50 static const char *getshell(void); 51 static int checkshell(const char *); 52 53 static __dead void 54 usage(void) 55 { 56 fprintf(stderr, 57 "usage: %s [-2Cluv] [-c shell-command] [-f file] [-L socket-name]\n" 58 " [-S socket-path] [command [flags]]\n", 59 getprogname()); 60 exit(1); 61 } 62 63 static const char * 64 getshell(void) 65 { 66 struct passwd *pw; 67 const char *shell; 68 69 shell = getenv("SHELL"); 70 if (checkshell(shell)) 71 return (shell); 72 73 pw = getpwuid(getuid()); 74 if (pw != NULL && checkshell(pw->pw_shell)) 75 return (pw->pw_shell); 76 77 return (_PATH_BSHELL); 78 } 79 80 static int 81 checkshell(const char *shell) 82 { 83 if (shell == NULL || *shell == '\0' || *shell != '/') 84 return (0); 85 if (areshell(shell)) 86 return (0); 87 if (access(shell, X_OK) != 0) 88 return (0); 89 return (1); 90 } 91 92 int 93 areshell(const char *shell) 94 { 95 const char *progname, *ptr; 96 97 if ((ptr = strrchr(shell, '/')) != NULL) 98 ptr++; 99 else 100 ptr = shell; 101 progname = getprogname(); 102 if (*progname == '-') 103 progname++; 104 if (strcmp(ptr, progname) == 0) 105 return (1); 106 return (0); 107 } 108 109 static char * 110 make_label(const char *label) 111 { 112 char *base, resolved[PATH_MAX], *path, *s; 113 struct stat sb; 114 u_int uid; 115 int saved_errno; 116 117 if (label == NULL) 118 label = "default"; 119 120 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-%u", _PATH_TMP, 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, **var, tmp[PATH_MAX], *shellcmd = NULL; 192 const char *s; 193 int opt, flags, keys; 194 195 if (setlocale(LC_CTYPE, "en_US.UTF-8") == NULL) { 196 if (setlocale(LC_CTYPE, "") == NULL) 197 errx(1, "invalid LC_ALL, LC_CTYPE or LANG"); 198 s = nl_langinfo(CODESET); 199 if (strcasecmp(s, "UTF-8") != 0 && strcasecmp(s, "UTF8") != 0) 200 errx(1, "need UTF-8 locale (LC_CTYPE) but have %s", s); 201 } 202 203 setlocale(LC_TIME, ""); 204 tzset(); 205 206 if (**argv == '-') 207 flags = CLIENT_LOGIN; 208 else 209 flags = 0; 210 211 label = path = NULL; 212 while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUv")) != -1) { 213 switch (opt) { 214 case '2': 215 flags |= CLIENT_256COLOURS; 216 break; 217 case 'c': 218 free(shellcmd); 219 shellcmd = xstrdup(optarg); 220 break; 221 case 'C': 222 if (flags & CLIENT_CONTROL) 223 flags |= CLIENT_CONTROLCONTROL; 224 else 225 flags |= CLIENT_CONTROL; 226 break; 227 case 'f': 228 set_cfg_file(optarg); 229 break; 230 case 'l': 231 flags |= CLIENT_LOGIN; 232 break; 233 case 'L': 234 free(label); 235 label = xstrdup(optarg); 236 break; 237 case 'q': 238 break; 239 case 'S': 240 free(path); 241 path = xstrdup(optarg); 242 break; 243 case 'u': 244 flags |= CLIENT_UTF8; 245 break; 246 case 'v': 247 log_add_level(); 248 break; 249 default: 250 usage(); 251 } 252 } 253 argc -= optind; 254 argv += optind; 255 256 if (shellcmd != NULL && argc != 0) 257 usage(); 258 259 if (pledge("stdio rpath wpath cpath flock fattr unix getpw sendfd " 260 "recvfd proc exec tty ps", NULL) != 0) 261 err(1, "pledge"); 262 263 /* 264 * tmux is a UTF-8 terminal, so if TMUX is set, assume UTF-8. 265 * Otherwise, if the user has set LC_ALL, LC_CTYPE or LANG to contain 266 * UTF-8, it is a safe assumption that either they are using a UTF-8 267 * terminal, or if not they know that output from UTF-8-capable 268 * programs may be wrong. 269 */ 270 if (getenv("TMUX") != NULL) 271 flags |= CLIENT_UTF8; 272 else { 273 s = getenv("LC_ALL"); 274 if (s == NULL || *s == '\0') 275 s = getenv("LC_CTYPE"); 276 if (s == NULL || *s == '\0') 277 s = getenv("LANG"); 278 if (s == NULL || *s == '\0') 279 s = ""; 280 if (strcasestr(s, "UTF-8") != NULL || 281 strcasestr(s, "UTF8") != NULL) 282 flags |= CLIENT_UTF8; 283 } 284 285 global_hooks = hooks_create(NULL); 286 287 global_environ = environ_create(); 288 for (var = environ; *var != NULL; var++) 289 environ_put(global_environ, *var); 290 if (getcwd(tmp, sizeof tmp) != NULL) 291 environ_set(global_environ, "PWD", "%s", tmp); 292 293 global_options = options_create(NULL); 294 options_table_populate_tree(OPTIONS_TABLE_SERVER, global_options); 295 296 global_s_options = options_create(NULL); 297 options_table_populate_tree(OPTIONS_TABLE_SESSION, global_s_options); 298 options_set_string(global_s_options, "default-shell", "%s", getshell()); 299 300 global_w_options = options_create(NULL); 301 options_table_populate_tree(OPTIONS_TABLE_WINDOW, global_w_options); 302 303 /* Override keys to vi if VISUAL or EDITOR are set. */ 304 if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) { 305 if (strrchr(s, '/') != NULL) 306 s = strrchr(s, '/') + 1; 307 if (strstr(s, "vi") != NULL) 308 keys = MODEKEY_VI; 309 else 310 keys = MODEKEY_EMACS; 311 options_set_number(global_s_options, "status-keys", keys); 312 options_set_number(global_w_options, "mode-keys", keys); 313 } 314 315 /* 316 * If socket is specified on the command-line with -S or -L, it is 317 * used. Otherwise, $TMUX is checked and if that fails "default" is 318 * used. 319 */ 320 if (path == NULL && label == NULL) { 321 s = getenv("TMUX"); 322 if (s != NULL && *s != '\0' && *s != ',') { 323 path = xstrdup(s); 324 path[strcspn(path, ",")] = '\0'; 325 } 326 } 327 if (path == NULL && (path = make_label(label)) == NULL) { 328 fprintf(stderr, "can't create socket: %s\n", strerror(errno)); 329 exit(1); 330 } 331 socket_path = path; 332 free(label); 333 334 /* Pass control to the client. */ 335 exit(client_main(event_init(), argc, argv, flags, shellcmd)); 336 } 337