1 /* $OpenBSD: tmux.c,v 1.170 2016/05/27 17:05:42 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 __dead void usage(void); 48 static char *make_label(const char *); 49 50 __dead void 51 usage(void) 52 { 53 fprintf(stderr, 54 "usage: %s [-2Cluv] [-c shell-command] [-f file] [-L socket-name]\n" 55 " [-S socket-path] [command [flags]]\n", 56 getprogname()); 57 exit(1); 58 } 59 60 const char * 61 getshell(void) 62 { 63 struct passwd *pw; 64 const char *shell; 65 66 shell = getenv("SHELL"); 67 if (checkshell(shell)) 68 return (shell); 69 70 pw = getpwuid(getuid()); 71 if (pw != NULL && checkshell(pw->pw_shell)) 72 return (pw->pw_shell); 73 74 return (_PATH_BSHELL); 75 } 76 77 int 78 checkshell(const char *shell) 79 { 80 if (shell == NULL || *shell == '\0' || *shell != '/') 81 return (0); 82 if (areshell(shell)) 83 return (0); 84 if (access(shell, X_OK) != 0) 85 return (0); 86 return (1); 87 } 88 89 int 90 areshell(const char *shell) 91 { 92 const char *progname, *ptr; 93 94 if ((ptr = strrchr(shell, '/')) != NULL) 95 ptr++; 96 else 97 ptr = shell; 98 progname = getprogname(); 99 if (*progname == '-') 100 progname++; 101 if (strcmp(ptr, progname) == 0) 102 return (1); 103 return (0); 104 } 105 106 static char * 107 make_label(const char *label) 108 { 109 char *base, resolved[PATH_MAX], *path, *s; 110 struct stat sb; 111 u_int uid; 112 int saved_errno; 113 114 if (label == NULL) 115 label = "default"; 116 117 uid = getuid(); 118 119 if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0') 120 xasprintf(&base, "%s/tmux-%u", s, uid); 121 else 122 xasprintf(&base, "%s/tmux-%u", _PATH_TMP, uid); 123 124 if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST) 125 goto fail; 126 127 if (lstat(base, &sb) != 0) 128 goto fail; 129 if (!S_ISDIR(sb.st_mode)) { 130 errno = ENOTDIR; 131 goto fail; 132 } 133 if (sb.st_uid != uid || (sb.st_mode & S_IRWXO) != 0) { 134 errno = EACCES; 135 goto fail; 136 } 137 138 if (realpath(base, resolved) == NULL) 139 strlcpy(resolved, base, sizeof resolved); 140 xasprintf(&path, "%s/%s", resolved, label); 141 return (path); 142 143 fail: 144 saved_errno = errno; 145 free(base); 146 errno = saved_errno; 147 return (NULL); 148 } 149 150 void 151 setblocking(int fd, int state) 152 { 153 int mode; 154 155 if ((mode = fcntl(fd, F_GETFL)) != -1) { 156 if (!state) 157 mode |= O_NONBLOCK; 158 else 159 mode &= ~O_NONBLOCK; 160 fcntl(fd, F_SETFL, mode); 161 } 162 } 163 164 const char * 165 find_home(void) 166 { 167 struct passwd *pw; 168 static const char *home; 169 170 if (home != NULL) 171 return (home); 172 173 home = getenv("HOME"); 174 if (home == NULL || *home == '\0') { 175 pw = getpwuid(getuid()); 176 if (pw != NULL) 177 home = pw->pw_dir; 178 else 179 home = NULL; 180 } 181 182 return (home); 183 } 184 185 int 186 main(int argc, char **argv) 187 { 188 char *path, *label, **var, tmp[PATH_MAX], *shellcmd = NULL; 189 const char *s; 190 int opt, flags, keys; 191 192 if (setlocale(LC_CTYPE, "en_US.UTF-8") == NULL) { 193 if (setlocale(LC_CTYPE, "") == NULL) 194 errx(1, "invalid LC_ALL, LC_CTYPE or LANG"); 195 s = nl_langinfo(CODESET); 196 if (strcasecmp(s, "UTF-8") != 0 && strcasecmp(s, "UTF8") != 0) 197 errx(1, "need UTF-8 locale (LC_CTYPE) but have %s", s); 198 } 199 200 setlocale(LC_TIME, ""); 201 tzset(); 202 203 if (**argv == '-') 204 flags = CLIENT_LOGIN; 205 else 206 flags = 0; 207 208 label = path = NULL; 209 while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUv")) != -1) { 210 switch (opt) { 211 case '2': 212 flags |= CLIENT_256COLOURS; 213 break; 214 case 'c': 215 free(shellcmd); 216 shellcmd = xstrdup(optarg); 217 break; 218 case 'C': 219 if (flags & CLIENT_CONTROL) 220 flags |= CLIENT_CONTROLCONTROL; 221 else 222 flags |= CLIENT_CONTROL; 223 break; 224 case 'f': 225 set_cfg_file(optarg); 226 break; 227 case 'l': 228 flags |= CLIENT_LOGIN; 229 break; 230 case 'L': 231 free(label); 232 label = xstrdup(optarg); 233 break; 234 case 'q': 235 break; 236 case 'S': 237 free(path); 238 path = xstrdup(optarg); 239 break; 240 case 'u': 241 flags |= CLIENT_UTF8; 242 break; 243 case 'v': 244 log_add_level(); 245 break; 246 default: 247 usage(); 248 } 249 } 250 argc -= optind; 251 argv += optind; 252 253 if (shellcmd != NULL && argc != 0) 254 usage(); 255 256 if (pledge("stdio rpath wpath cpath flock fattr unix getpw sendfd " 257 "recvfd proc exec tty ps", NULL) != 0) 258 err(1, "pledge"); 259 260 /* 261 * tmux is a UTF-8 terminal, so if TMUX is set, assume UTF-8. 262 * Otherwise, if the user has set LC_ALL, LC_CTYPE or LANG to contain 263 * UTF-8, it is a safe assumption that either they are using a UTF-8 264 * terminal, or if not they know that output from UTF-8-capable 265 * programs may be wrong. 266 */ 267 if (getenv("TMUX") != NULL) 268 flags |= CLIENT_UTF8; 269 else { 270 s = getenv("LC_ALL"); 271 if (s == NULL || *s == '\0') 272 s = getenv("LC_CTYPE"); 273 if (s == NULL || *s == '\0') 274 s = getenv("LANG"); 275 if (s == NULL || *s == '\0') 276 s = ""; 277 if (strcasestr(s, "UTF-8") != NULL || 278 strcasestr(s, "UTF8") != NULL) 279 flags |= CLIENT_UTF8; 280 } 281 282 global_hooks = hooks_create(NULL); 283 284 global_environ = environ_create(); 285 for (var = environ; *var != NULL; var++) 286 environ_put(global_environ, *var); 287 if (getcwd(tmp, sizeof tmp) != NULL) 288 environ_set(global_environ, "PWD", "%s", tmp); 289 290 global_options = options_create(NULL); 291 options_table_populate_tree(OPTIONS_TABLE_SERVER, global_options); 292 293 global_s_options = options_create(NULL); 294 options_table_populate_tree(OPTIONS_TABLE_SESSION, global_s_options); 295 options_set_string(global_s_options, "default-shell", "%s", getshell()); 296 297 global_w_options = options_create(NULL); 298 options_table_populate_tree(OPTIONS_TABLE_WINDOW, global_w_options); 299 300 /* Override keys to vi if VISUAL or EDITOR are set. */ 301 if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) { 302 if (strrchr(s, '/') != NULL) 303 s = strrchr(s, '/') + 1; 304 if (strstr(s, "vi") != NULL) 305 keys = MODEKEY_VI; 306 else 307 keys = MODEKEY_EMACS; 308 options_set_number(global_s_options, "status-keys", keys); 309 options_set_number(global_w_options, "mode-keys", keys); 310 } 311 312 /* 313 * If socket is specified on the command-line with -S or -L, it is 314 * used. Otherwise, $TMUX is checked and if that fails "default" is 315 * used. 316 */ 317 if (path == NULL && label == NULL) { 318 s = getenv("TMUX"); 319 if (s != NULL && *s != '\0' && *s != ',') { 320 path = xstrdup(s); 321 path[strcspn (path, ",")] = '\0'; 322 } 323 } 324 if (path == NULL && (path = make_label(label)) == NULL) { 325 fprintf(stderr, "can't create socket: %s\n", strerror(errno)); 326 exit(1); 327 } 328 socket_path = path; 329 free(label); 330 331 /* Pass control to the client. */ 332 exit(client_main(event_init(), argc, argv, flags, shellcmd)); 333 } 334