tmux.c revision 1.31
1/* $OpenBSD: tmux.c,v 1.31 2009/08/11 17:18:35 nicm Exp $ */ 2 3/* 4 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net> 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 <paths.h> 24#include <pwd.h> 25#include <signal.h> 26#include <stdlib.h> 27#include <string.h> 28#include <syslog.h> 29#include <unistd.h> 30 31#include "tmux.h" 32 33#ifdef DEBUG 34const char *malloc_options = "AFGJPX"; 35#endif 36 37volatile sig_atomic_t sigwinch; 38volatile sig_atomic_t sigterm; 39volatile sig_atomic_t sigcont; 40volatile sig_atomic_t sigchld; 41volatile sig_atomic_t sigusr1; 42volatile sig_atomic_t sigusr2; 43 44char *cfg_file; 45struct options global_s_options; /* session options */ 46struct options global_w_options; /* window options */ 47struct environ global_environ; 48 49int server_locked; 50u_int password_failures; 51char *server_password; 52time_t server_activity; 53 54int debug_level; 55int be_quiet; 56time_t start_time; 57char *socket_path; 58 59__dead void usage(void); 60char *makesockpath(const char *); 61int prepare_unlock(enum msgtype *, void **, size_t *, int); 62int prepare_cmd(enum msgtype *, void **, size_t *, int, char **); 63int dispatch_imsg(struct client_ctx *, int *); 64 65__dead void 66usage(void) 67{ 68 fprintf(stderr, 69 "usage: %s [-28dqUuv] [-f file] [-L socket-name] [-S socket-path]\n" 70 " [command [flags]]\n", 71 __progname); 72 exit(1); 73} 74 75void 76logfile(const char *name) 77{ 78 char *path; 79 80 log_close(); 81 if (debug_level > 0) { 82 xasprintf( 83 &path, "%s-%s-%ld.log", __progname, name, (long) getpid()); 84 log_open_file(debug_level, path); 85 xfree(path); 86 } 87} 88 89void 90sighandler(int sig) 91{ 92 int saved_errno; 93 94 saved_errno = errno; 95 switch (sig) { 96 case SIGWINCH: 97 sigwinch = 1; 98 break; 99 case SIGTERM: 100 sigterm = 1; 101 break; 102 case SIGCHLD: 103 sigchld = 1; 104 break; 105 case SIGCONT: 106 sigcont = 1; 107 break; 108 case SIGUSR1: 109 sigusr1 = 1; 110 break; 111 case SIGUSR2: 112 sigusr2 = 1; 113 break; 114 } 115 errno = saved_errno; 116} 117 118void 119siginit(void) 120{ 121 struct sigaction act; 122 123 memset(&act, 0, sizeof act); 124 sigemptyset(&act.sa_mask); 125 act.sa_flags = SA_RESTART; 126 127 act.sa_handler = SIG_IGN; 128 if (sigaction(SIGPIPE, &act, NULL) != 0) 129 fatal("sigaction failed"); 130 if (sigaction(SIGINT, &act, NULL) != 0) 131 fatal("sigaction failed"); 132 if (sigaction(SIGTSTP, &act, NULL) != 0) 133 fatal("sigaction failed"); 134 if (sigaction(SIGQUIT, &act, NULL) != 0) 135 fatal("sigaction failed"); 136 137 act.sa_handler = sighandler; 138 if (sigaction(SIGWINCH, &act, NULL) != 0) 139 fatal("sigaction failed"); 140 if (sigaction(SIGTERM, &act, NULL) != 0) 141 fatal("sigaction failed"); 142 if (sigaction(SIGCHLD, &act, NULL) != 0) 143 fatal("sigaction failed"); 144 if (sigaction(SIGUSR1, &act, NULL) != 0) 145 fatal("sigaction failed"); 146 if (sigaction(SIGUSR2, &act, NULL) != 0) 147 fatal("sigaction failed"); 148} 149 150void 151sigreset(void) 152{ 153 struct sigaction act; 154 155 memset(&act, 0, sizeof act); 156 sigemptyset(&act.sa_mask); 157 158 act.sa_handler = SIG_DFL; 159 if (sigaction(SIGPIPE, &act, NULL) != 0) 160 fatal("sigaction failed"); 161 if (sigaction(SIGUSR1, &act, NULL) != 0) 162 fatal("sigaction failed"); 163 if (sigaction(SIGUSR2, &act, NULL) != 0) 164 fatal("sigaction failed"); 165 if (sigaction(SIGINT, &act, NULL) != 0) 166 fatal("sigaction failed"); 167 if (sigaction(SIGTSTP, &act, NULL) != 0) 168 fatal("sigaction failed"); 169 if (sigaction(SIGQUIT, &act, NULL) != 0) 170 fatal("sigaction failed"); 171 if (sigaction(SIGWINCH, &act, NULL) != 0) 172 fatal("sigaction failed"); 173 if (sigaction(SIGTERM, &act, NULL) != 0) 174 fatal("sigaction failed"); 175 if (sigaction(SIGCHLD, &act, NULL) != 0) 176 fatal("sigaction failed"); 177} 178 179char * 180makesockpath(const char *label) 181{ 182 char base[MAXPATHLEN], *path; 183 struct stat sb; 184 u_int uid; 185 186 uid = getuid(); 187 xsnprintf(base, MAXPATHLEN, "%s/%s-%d", _PATH_TMP, __progname, uid); 188 189 if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST) 190 return (NULL); 191 192 if (lstat(base, &sb) != 0) 193 return (NULL); 194 if (!S_ISDIR(sb.st_mode)) { 195 errno = ENOTDIR; 196 return (NULL); 197 } 198 if (sb.st_uid != uid || (sb.st_mode & (S_IRWXG|S_IRWXO)) != 0) { 199 errno = EACCES; 200 return (NULL); 201 } 202 203 xasprintf(&path, "%s/%s", base, label); 204 return (path); 205} 206 207int 208prepare_unlock(enum msgtype *msg, void **buf, size_t *len, int argc) 209{ 210 static struct msg_unlock_data unlockdata; 211 char *pass; 212 213 if (argc != 0) { 214 log_warnx("can't specify a command when unlocking"); 215 return (-1); 216 } 217 218 if ((pass = getpass("Password: ")) == NULL) 219 return (-1); 220 221 if (strlen(pass) >= sizeof unlockdata.pass) { 222 log_warnx("password too long"); 223 return (-1); 224 } 225 226 strlcpy(unlockdata.pass, pass, sizeof unlockdata.pass); 227 memset(pass, 0, strlen(pass)); 228 229 *buf = &unlockdata; 230 *len = sizeof unlockdata; 231 232 *msg = MSG_UNLOCK; 233 return (0); 234} 235 236int 237prepare_cmd(enum msgtype *msg, void **buf, size_t *len, int argc, char **argv) 238{ 239 static struct msg_command_data cmddata; 240 241 client_fill_session(&cmddata); 242 243 cmddata.argc = argc; 244 if (cmd_pack_argv(argc, argv, cmddata.argv, sizeof cmddata.argv) != 0) { 245 log_warnx("command too long"); 246 return (-1); 247 } 248 249 *buf = &cmddata; 250 *len = sizeof cmddata; 251 252 *msg = MSG_COMMAND; 253 return (0); 254} 255 256int 257main(int argc, char **argv) 258{ 259 struct client_ctx cctx; 260 struct cmd_list *cmdlist; 261 struct cmd *cmd; 262 struct pollfd pfd; 263 enum msgtype msg; 264 struct passwd *pw; 265 char *s, *path, *label, *home, *cause, **var; 266 char cwd[MAXPATHLEN]; 267 void *buf; 268 size_t len; 269 int retcode, opt, flags, unlock, cmdflags = 0; 270 int nfds; 271 272 unlock = flags = 0; 273 label = path = NULL; 274 while ((opt = getopt(argc, argv, "28df:L:qS:uUv")) != -1) { 275 switch (opt) { 276 case '2': 277 flags |= IDENTIFY_256COLOURS; 278 flags &= ~IDENTIFY_88COLOURS; 279 break; 280 case '8': 281 flags |= IDENTIFY_88COLOURS; 282 flags &= ~IDENTIFY_256COLOURS; 283 break; 284 case 'f': 285 if (cfg_file) 286 xfree(cfg_file); 287 cfg_file = xstrdup(optarg); 288 break; 289 case 'L': 290 if (label != NULL) 291 xfree(label); 292 label = xstrdup(optarg); 293 break; 294 case 'S': 295 if (path != NULL) 296 xfree(path); 297 path = xstrdup(optarg); 298 break; 299 case 'q': 300 be_quiet = 1; 301 break; 302 case 'u': 303 flags |= IDENTIFY_UTF8; 304 break; 305 case 'U': 306 unlock = 1; 307 break; 308 case 'd': 309 flags |= IDENTIFY_HASDEFAULTS; 310 break; 311 case 'v': 312 debug_level++; 313 break; 314 default: 315 usage(); 316 } 317 } 318 argc -= optind; 319 argv += optind; 320 321 log_open_tty(debug_level); 322 siginit(); 323 324 environ_init(&global_environ); 325 for (var = environ; *var != NULL; var++) 326 environ_put(&global_environ, *var); 327 328 if (!(flags & IDENTIFY_UTF8)) { 329 /* 330 * If the user has set whichever of LC_ALL, LC_CTYPE or LANG 331 * exist (in that order) to contain UTF-8, it is a safe 332 * assumption that either they are using a UTF-8 terminal, or 333 * if not they know that output from UTF-8-capable programs may 334 * be wrong. 335 */ 336 if ((s = getenv("LC_ALL")) == NULL) { 337 if ((s = getenv("LC_CTYPE")) == NULL) 338 s = getenv("LANG"); 339 } 340 if (s != NULL && (strcasestr(s, "UTF-8") != NULL || 341 strcasestr(s, "UTF8") != NULL)) 342 flags |= IDENTIFY_UTF8; 343 } 344 345 options_init(&global_s_options, NULL); 346 options_set_number(&global_s_options, "bell-action", BELL_ANY); 347 options_set_number(&global_s_options, "buffer-limit", 9); 348 options_set_string(&global_s_options, "default-command", "%s", ""); 349 options_set_string(&global_s_options, "default-terminal", "screen"); 350 options_set_number(&global_s_options, "display-time", 750); 351 options_set_number(&global_s_options, "history-limit", 2000); 352 options_set_number(&global_s_options, "lock-after-time", 0); 353 options_set_number(&global_s_options, "message-attr", 0); 354 options_set_number(&global_s_options, "message-bg", 3); 355 options_set_number(&global_s_options, "message-fg", 0); 356 options_set_number(&global_s_options, "prefix", '\002'); 357 options_set_number(&global_s_options, "repeat-time", 500); 358 options_set_number(&global_s_options, "set-remain-on-exit", 0); 359 options_set_number(&global_s_options, "set-titles", 0); 360 options_set_number(&global_s_options, "status", 1); 361 options_set_number(&global_s_options, "status-attr", 0); 362 options_set_number(&global_s_options, "status-bg", 2); 363 options_set_number(&global_s_options, "status-fg", 0); 364 options_set_number(&global_s_options, "status-interval", 15); 365 options_set_number(&global_s_options, "status-keys", MODEKEY_EMACS); 366 options_set_number(&global_s_options, "status-justify", 0); 367 options_set_string(&global_s_options, "status-left", "[#S]"); 368 options_set_number(&global_s_options, "status-left-attr", 0); 369 options_set_number(&global_s_options, "status-left-fg", 8); 370 options_set_number(&global_s_options, "status-left-bg", 8); 371 options_set_number(&global_s_options, "status-left-length", 10); 372 options_set_string( 373 &global_s_options, "status-right", "\"#22T\" %%H:%%M %%d-%%b-%%y"); 374 options_set_number(&global_s_options, "status-right-attr", 0); 375 options_set_number(&global_s_options, "status-right-fg", 8); 376 options_set_number(&global_s_options, "status-right-bg", 8); 377 options_set_number(&global_s_options, "status-right-length", 40); 378 if (flags & IDENTIFY_UTF8) 379 options_set_number(&global_s_options, "status-utf8", 1); 380 else 381 options_set_number(&global_s_options, "status-utf8", 0); 382 options_set_string(&global_s_options, 383 "terminal-overrides", "*88col*:colors=88,*256col*:colors=256"); 384 options_set_string(&global_s_options, "update-environment", "DISPLAY"); 385 options_set_number(&global_s_options, "visual-activity", 0); 386 options_set_number(&global_s_options, "visual-bell", 0); 387 options_set_number(&global_s_options, "visual-content", 0); 388 389 options_init(&global_w_options, NULL); 390 options_set_number(&global_w_options, "aggressive-resize", 0); 391 options_set_number(&global_w_options, "automatic-rename", 1); 392 options_set_number(&global_w_options, "clock-mode-colour", 4); 393 options_set_number(&global_w_options, "clock-mode-style", 1); 394 options_set_number(&global_w_options, "force-height", 0); 395 options_set_number(&global_w_options, "force-width", 0); 396 options_set_number(&global_w_options, "main-pane-width", 81); 397 options_set_number(&global_w_options, "main-pane-height", 24); 398 options_set_number(&global_w_options, "mode-attr", 0); 399 options_set_number(&global_w_options, "mode-bg", 3); 400 options_set_number(&global_w_options, "mode-fg", 0); 401 options_set_number(&global_w_options, "mode-keys", MODEKEY_EMACS); 402 options_set_number(&global_w_options, "mode-mouse", 1); 403 options_set_number(&global_w_options, "monitor-activity", 0); 404 options_set_string(&global_w_options, "monitor-content", "%s", ""); 405 if (flags & IDENTIFY_UTF8) 406 options_set_number(&global_w_options, "utf8", 1); 407 else 408 options_set_number(&global_w_options, "utf8", 0); 409 options_set_number(&global_w_options, "window-status-attr", 0); 410 options_set_number(&global_w_options, "window-status-bg", 8); 411 options_set_number(&global_w_options, "window-status-fg", 8); 412 options_set_number(&global_w_options, "window-status-current-attr", 0); 413 options_set_number(&global_w_options, "window-status-current-bg", 8); 414 options_set_number(&global_w_options, "window-status-current-fg", 8); 415 options_set_number(&global_w_options, "xterm-keys", 0); 416 options_set_number(&global_w_options, "remain-on-exit", 0); 417 418 if (cfg_file == NULL) { 419 home = getenv("HOME"); 420 if (home == NULL || *home == '\0') { 421 pw = getpwuid(getuid()); 422 if (pw != NULL) 423 home = pw->pw_dir; 424 } 425 xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG); 426 if (access(cfg_file, R_OK) != 0) { 427 xfree(cfg_file); 428 cfg_file = NULL; 429 } 430 } else { 431 if (access(cfg_file, R_OK) != 0) { 432 log_warn("%s", cfg_file); 433 exit(1); 434 } 435 } 436 437 if (label == NULL) 438 label = xstrdup("default"); 439 if (path == NULL && (path = makesockpath(label)) == NULL) { 440 log_warn("can't create socket"); 441 exit(1); 442 } 443 xfree(label); 444 445 if (getcwd(cwd, sizeof cwd) == NULL) { 446 pw = getpwuid(getuid()); 447 if (pw->pw_dir != NULL && *pw->pw_dir != '\0') 448 strlcpy(cwd, pw->pw_dir, sizeof cwd); 449 else 450 strlcpy(cwd, "/", sizeof cwd); 451 } 452 options_set_string(&global_s_options, "default-path", "%s", cwd); 453 454 if (unlock) { 455 if (prepare_unlock(&msg, &buf, &len, argc) != 0) 456 exit(1); 457 } else { 458 if (prepare_cmd(&msg, &buf, &len, argc, argv) != 0) 459 exit(1); 460 } 461 462 if (unlock) 463 cmdflags &= ~CMD_STARTSERVER; 464 else if (argc == 0) 465 cmdflags |= CMD_STARTSERVER|CMD_SENDENVIRON; 466 else { 467 /* 468 * It sucks parsing the command string twice (in client and 469 * later in server) but it is necessary to get the start server 470 * flag. 471 */ 472 if ((cmdlist = cmd_list_parse(argc, argv, &cause)) == NULL) { 473 log_warnx("%s", cause); 474 exit(1); 475 } 476 cmdflags &= ~CMD_STARTSERVER; 477 TAILQ_FOREACH(cmd, cmdlist, qentry) { 478 if (cmd->entry->flags & CMD_STARTSERVER) 479 cmdflags |= CMD_STARTSERVER; 480 if (cmd->entry->flags & CMD_SENDENVIRON) 481 cmdflags |= CMD_SENDENVIRON; 482 } 483 cmd_list_free(cmdlist); 484 } 485 486 memset(&cctx, 0, sizeof cctx); 487 if (client_init(path, &cctx, cmdflags, flags) != 0) 488 exit(1); 489 xfree(path); 490 491 client_write_server(&cctx, msg, buf, len); 492 memset(buf, 0, len); 493 494 retcode = 0; 495 for (;;) { 496 pfd.fd = cctx.ibuf.fd; 497 pfd.events = POLLIN; 498 if (cctx.ibuf.w.queued != 0) 499 pfd.events |= POLLOUT; 500 501 if ((nfds = poll(&pfd, 1, INFTIM)) == -1) { 502 if (errno == EAGAIN || errno == EINTR) 503 continue; 504 fatal("poll failed"); 505 } 506 if (nfds == 0) 507 continue; 508 509 if (pfd.revents & (POLLERR|POLLHUP|POLLNVAL)) 510 fatalx("socket error"); 511 512 if (pfd.revents & POLLIN) { 513 if (dispatch_imsg(&cctx, &retcode) != 0) 514 break; 515 } 516 517 if (pfd.revents & POLLOUT) { 518 if (msgbuf_write(&cctx.ibuf.w) < 0) 519 fatalx("msgbuf_write failed"); 520 } 521 } 522 523 options_free(&global_s_options); 524 options_free(&global_w_options); 525 526 return (retcode); 527} 528 529int 530dispatch_imsg(struct client_ctx *cctx, int *retcode) 531{ 532 struct imsg imsg; 533 ssize_t n, datalen; 534 struct msg_print_data printdata; 535 536 if ((n = imsg_read(&cctx->ibuf)) == -1 || n == 0) 537 fatalx("imsg_read failed"); 538 539 for (;;) { 540 if ((n = imsg_get(&cctx->ibuf, &imsg)) == -1) 541 fatalx("imsg_get failed"); 542 if (n == 0) 543 return (0); 544 datalen = imsg.hdr.len - IMSG_HEADER_SIZE; 545 546 switch (imsg.hdr.type) { 547 case MSG_EXIT: 548 case MSG_SHUTDOWN: 549 if (datalen != 0) 550 fatalx("bad MSG_EXIT size"); 551 552 return (-1); 553 case MSG_ERROR: 554 *retcode = 1; 555 /* FALLTHROUGH */ 556 case MSG_PRINT: 557 if (datalen != sizeof printdata) 558 fatalx("bad MSG_PRINT size"); 559 memcpy(&printdata, imsg.data, sizeof printdata); 560 printdata.msg[(sizeof printdata.msg) - 1] = '\0'; 561 562 log_info("%s", printdata.msg); 563 break; 564 case MSG_READY: 565 if (datalen != 0) 566 fatalx("bad MSG_READY size"); 567 568 *retcode = client_main(cctx); 569 return (-1); 570 case MSG_VERSION: 571 if (datalen != 0) 572 fatalx("bad MSG_VERSION size"); 573 574 log_warnx("protocol version mismatch (client %u, " 575 "server %u)", PROTOCOL_VERSION, imsg.hdr.peerid); 576 *retcode = 1; 577 return (-1); 578 default: 579 fatalx("unexpected message"); 580 } 581 582 imsg_free(&imsg); 583 } 584} 585