tmux.c revision 1.182
1/* $OpenBSD: tmux.c,v 1.182 2017/04/22 12:08:41 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 38struct options *global_options; /* server options */ 39struct options *global_s_options; /* session options */ 40struct options *global_w_options; /* window options */ 41struct environ *global_environ; 42struct hooks *global_hooks; 43 44struct timeval start_time; 45const char *socket_path; 46int ptm_fd = -1; 47 48static __dead void usage(void); 49static char *make_label(const char *); 50 51static const char *getshell(void); 52static int checkshell(const char *); 53 54static __dead void 55usage(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 64static const char * 65getshell(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 81static int 82checkshell(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 93int 94areshell(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 110static char * 111make_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-%ld", s, (long)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); 144 145 free(base); 146 return (path); 147 148fail: 149 saved_errno = errno; 150 free(base); 151 errno = saved_errno; 152 return (NULL); 153} 154 155void 156setblocking(int fd, int state) 157{ 158 int mode; 159 160 if ((mode = fcntl(fd, F_GETFL)) != -1) { 161 if (!state) 162 mode |= O_NONBLOCK; 163 else 164 mode &= ~O_NONBLOCK; 165 fcntl(fd, F_SETFL, mode); 166 } 167} 168 169const char * 170find_home(void) 171{ 172 struct passwd *pw; 173 static const char *home; 174 175 if (home != NULL) 176 return (home); 177 178 home = getenv("HOME"); 179 if (home == NULL || *home == '\0') { 180 pw = getpwuid(getuid()); 181 if (pw != NULL) 182 home = pw->pw_dir; 183 else 184 home = NULL; 185 } 186 187 return (home); 188} 189 190int 191main(int argc, char **argv) 192{ 193 char *path, *label, tmp[PATH_MAX]; 194 char *shellcmd = NULL, **var; 195 const char *s, *shell; 196 int opt, flags, keys; 197 const struct options_table_entry *oe; 198 199 if (setlocale(LC_CTYPE, "en_US.UTF-8") == NULL) { 200 if (setlocale(LC_CTYPE, "") == NULL) 201 errx(1, "invalid LC_ALL, LC_CTYPE or LANG"); 202 s = nl_langinfo(CODESET); 203 if (strcasecmp(s, "UTF-8") != 0 && strcasecmp(s, "UTF8") != 0) 204 errx(1, "need UTF-8 locale (LC_CTYPE) but have %s", s); 205 } 206 207 setlocale(LC_TIME, ""); 208 tzset(); 209 210 if (**argv == '-') 211 flags = CLIENT_LOGIN; 212 else 213 flags = 0; 214 215 label = path = NULL; 216 while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUv")) != -1) { 217 switch (opt) { 218 case '2': 219 flags |= CLIENT_256COLOURS; 220 break; 221 case 'c': 222 free(shellcmd); 223 shellcmd = xstrdup(optarg); 224 break; 225 case 'C': 226 if (flags & CLIENT_CONTROL) 227 flags |= CLIENT_CONTROLCONTROL; 228 else 229 flags |= CLIENT_CONTROL; 230 break; 231 case 'f': 232 set_cfg_file(optarg); 233 break; 234 case 'l': 235 flags |= CLIENT_LOGIN; 236 break; 237 case 'L': 238 free(label); 239 label = xstrdup(optarg); 240 break; 241 case 'q': 242 break; 243 case 'S': 244 free(path); 245 path = xstrdup(optarg); 246 break; 247 case 'u': 248 flags |= CLIENT_UTF8; 249 break; 250 case 'v': 251 log_add_level(); 252 break; 253 default: 254 usage(); 255 } 256 } 257 argc -= optind; 258 argv += optind; 259 260 if (shellcmd != NULL && argc != 0) 261 usage(); 262 263 if ((ptm_fd = getptmfd()) == -1) 264 err(1, "getptmfd"); 265 if (pledge("stdio rpath wpath cpath flock fattr unix getpw sendfd " 266 "recvfd proc exec tty ps", NULL) != 0) 267 err(1, "pledge"); 268 269 /* 270 * tmux is a UTF-8 terminal, so if TMUX is set, assume UTF-8. 271 * Otherwise, if the user has set LC_ALL, LC_CTYPE or LANG to contain 272 * UTF-8, it is a safe assumption that either they are using a UTF-8 273 * terminal, or if not they know that output from UTF-8-capable 274 * programs may be wrong. 275 */ 276 if (getenv("TMUX") != NULL) 277 flags |= CLIENT_UTF8; 278 else { 279 s = getenv("LC_ALL"); 280 if (s == NULL || *s == '\0') 281 s = getenv("LC_CTYPE"); 282 if (s == NULL || *s == '\0') 283 s = getenv("LANG"); 284 if (s == NULL || *s == '\0') 285 s = ""; 286 if (strcasestr(s, "UTF-8") != NULL || 287 strcasestr(s, "UTF8") != NULL) 288 flags |= CLIENT_UTF8; 289 } 290 291 global_hooks = hooks_create(NULL); 292 293 global_environ = environ_create(); 294 for (var = environ; *var != NULL; var++) 295 environ_put(global_environ, *var); 296 if (getcwd(tmp, sizeof tmp) != NULL) 297 environ_set(global_environ, "PWD", "%s", tmp); 298 299 global_options = options_create(NULL); 300 global_s_options = options_create(NULL); 301 global_w_options = options_create(NULL); 302 for (oe = options_table; oe->name != NULL; oe++) { 303 if (oe->scope == OPTIONS_TABLE_SERVER) 304 options_default(global_options, oe); 305 if (oe->scope == OPTIONS_TABLE_SESSION) 306 options_default(global_s_options, oe); 307 if (oe->scope == OPTIONS_TABLE_WINDOW) 308 options_default(global_w_options, oe); 309 } 310 311 /* 312 * The default shell comes from SHELL or from the user's passwd entry 313 * if available. 314 */ 315 shell = getshell(); 316 options_set_string(global_s_options, "default-shell", 0, "%s", shell); 317 318 /* Override keys to vi if VISUAL or EDITOR are set. */ 319 if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) { 320 if (strrchr(s, '/') != NULL) 321 s = strrchr(s, '/') + 1; 322 if (strstr(s, "vi") != NULL) 323 keys = MODEKEY_VI; 324 else 325 keys = MODEKEY_EMACS; 326 options_set_number(global_s_options, "status-keys", keys); 327 options_set_number(global_w_options, "mode-keys", keys); 328 } 329 330 /* 331 * If socket is specified on the command-line with -S or -L, it is 332 * used. Otherwise, $TMUX is checked and if that fails "default" is 333 * used. 334 */ 335 if (path == NULL && label == NULL) { 336 s = getenv("TMUX"); 337 if (s != NULL && *s != '\0' && *s != ',') { 338 path = xstrdup(s); 339 path[strcspn(path, ",")] = '\0'; 340 } 341 } 342 if (path == NULL && (path = make_label(label)) == NULL) { 343 fprintf(stderr, "can't create socket: %s\n", strerror(errno)); 344 exit(1); 345 } 346 socket_path = path; 347 free(label); 348 349 /* Pass control to the client. */ 350 exit(client_main(event_init(), argc, argv, flags, shellcmd)); 351} 352