tmux.c revision 1.45
1/* $OpenBSD: tmux.c,v 1.45 2009/09/23 06:18:48 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 49time_t server_activity; 50 51int debug_level; 52int be_quiet; 53time_t start_time; 54char *socket_path; 55int login_shell; 56 57__dead void usage(void); 58char *makesockpath(const char *); 59int prepare_cmd(enum msgtype *, void **, size_t *, int, char **); 60int dispatch_imsg(struct client_ctx *, int *); 61 62__dead void 63usage(void) 64{ 65 fprintf(stderr, 66 "usage: %s [-28dlquv] [-f file] [-L socket-name]\n" 67 " [-S socket-path] [command [flags]]\n", 68 __progname); 69 exit(1); 70} 71 72void 73logfile(const char *name) 74{ 75 char *path; 76 77 log_close(); 78 if (debug_level > 0) { 79 xasprintf(&path, "tmux-%s-%ld.log", name, (long) getpid()); 80 log_open_file(debug_level, path); 81 xfree(path); 82 } 83} 84 85void 86sighandler(int sig) 87{ 88 int saved_errno; 89 90 saved_errno = errno; 91 switch (sig) { 92 case SIGWINCH: 93 sigwinch = 1; 94 break; 95 case SIGTERM: 96 sigterm = 1; 97 break; 98 case SIGCHLD: 99 sigchld = 1; 100 break; 101 case SIGCONT: 102 sigcont = 1; 103 break; 104 case SIGUSR1: 105 sigusr1 = 1; 106 break; 107 case SIGUSR2: 108 sigusr2 = 1; 109 break; 110 } 111 errno = saved_errno; 112} 113 114void 115siginit(void) 116{ 117 struct sigaction act; 118 119 memset(&act, 0, sizeof act); 120 sigemptyset(&act.sa_mask); 121 act.sa_flags = SA_RESTART; 122 123 act.sa_handler = SIG_IGN; 124 if (sigaction(SIGPIPE, &act, NULL) != 0) 125 fatal("sigaction failed"); 126 if (sigaction(SIGINT, &act, NULL) != 0) 127 fatal("sigaction failed"); 128 if (sigaction(SIGTSTP, &act, NULL) != 0) 129 fatal("sigaction failed"); 130 if (sigaction(SIGQUIT, &act, NULL) != 0) 131 fatal("sigaction failed"); 132 133 act.sa_handler = sighandler; 134 if (sigaction(SIGWINCH, &act, NULL) != 0) 135 fatal("sigaction failed"); 136 if (sigaction(SIGTERM, &act, NULL) != 0) 137 fatal("sigaction failed"); 138 if (sigaction(SIGCHLD, &act, NULL) != 0) 139 fatal("sigaction failed"); 140 if (sigaction(SIGUSR1, &act, NULL) != 0) 141 fatal("sigaction failed"); 142 if (sigaction(SIGUSR2, &act, NULL) != 0) 143 fatal("sigaction failed"); 144} 145 146void 147sigreset(void) 148{ 149 struct sigaction act; 150 151 memset(&act, 0, sizeof act); 152 sigemptyset(&act.sa_mask); 153 154 act.sa_handler = SIG_DFL; 155 if (sigaction(SIGPIPE, &act, NULL) != 0) 156 fatal("sigaction failed"); 157 if (sigaction(SIGUSR1, &act, NULL) != 0) 158 fatal("sigaction failed"); 159 if (sigaction(SIGUSR2, &act, NULL) != 0) 160 fatal("sigaction failed"); 161 if (sigaction(SIGINT, &act, NULL) != 0) 162 fatal("sigaction failed"); 163 if (sigaction(SIGTSTP, &act, NULL) != 0) 164 fatal("sigaction failed"); 165 if (sigaction(SIGQUIT, &act, NULL) != 0) 166 fatal("sigaction failed"); 167 if (sigaction(SIGWINCH, &act, NULL) != 0) 168 fatal("sigaction failed"); 169 if (sigaction(SIGTERM, &act, NULL) != 0) 170 fatal("sigaction failed"); 171 if (sigaction(SIGCHLD, &act, NULL) != 0) 172 fatal("sigaction failed"); 173} 174 175const char * 176getshell(void) 177{ 178 struct passwd *pw; 179 const char *shell; 180 181 shell = getenv("SHELL"); 182 if (checkshell(shell)) 183 return (shell); 184 185 pw = getpwuid(getuid()); 186 if (pw != NULL && checkshell(pw->pw_shell)) 187 return (pw->pw_shell); 188 189 return (_PATH_BSHELL); 190} 191 192int 193checkshell(const char *shell) 194{ 195 if (shell == NULL || *shell == '\0' || areshell(shell)) 196 return (0); 197 if (access(shell, X_OK) != 0) 198 return (0); 199 return (1); 200} 201 202int 203areshell(const char *shell) 204{ 205 const char *progname, *ptr; 206 207 if ((ptr = strrchr(shell, '/')) != NULL) 208 ptr++; 209 else 210 ptr = shell; 211 progname = __progname; 212 if (*progname == '-') 213 progname++; 214 if (strcmp(ptr, progname) == 0) 215 return (1); 216 return (0); 217} 218 219char * 220makesockpath(const char *label) 221{ 222 char base[MAXPATHLEN], *path; 223 struct stat sb; 224 u_int uid; 225 226 uid = getuid(); 227 xsnprintf(base, MAXPATHLEN, "%s/tmux-%d", _PATH_TMP, uid); 228 229 if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST) 230 return (NULL); 231 232 if (lstat(base, &sb) != 0) 233 return (NULL); 234 if (!S_ISDIR(sb.st_mode)) { 235 errno = ENOTDIR; 236 return (NULL); 237 } 238 if (sb.st_uid != uid || (sb.st_mode & (S_IRWXG|S_IRWXO)) != 0) { 239 errno = EACCES; 240 return (NULL); 241 } 242 243 xasprintf(&path, "%s/%s", base, label); 244 return (path); 245} 246 247int 248prepare_cmd(enum msgtype *msg, void **buf, size_t *len, int argc, char **argv) 249{ 250 static struct msg_command_data cmddata; 251 252 client_fill_session(&cmddata); 253 254 cmddata.argc = argc; 255 if (cmd_pack_argv(argc, argv, cmddata.argv, sizeof cmddata.argv) != 0) { 256 log_warnx("command too long"); 257 return (-1); 258 } 259 260 *buf = &cmddata; 261 *len = sizeof cmddata; 262 263 *msg = MSG_COMMAND; 264 return (0); 265} 266 267int 268main(int argc, char **argv) 269{ 270 struct client_ctx cctx; 271 struct cmd_list *cmdlist; 272 struct cmd *cmd; 273 struct pollfd pfd; 274 enum msgtype msg; 275 struct passwd *pw; 276 struct options *so, *wo; 277 struct keylist *keylist; 278 char *s, *path, *label, *home, *cause, **var; 279 char cwd[MAXPATHLEN]; 280 void *buf; 281 size_t len; 282 int retcode, opt, flags, cmdflags = 0; 283 int nfds; 284 285 flags = 0; 286 label = path = NULL; 287 login_shell = (**argv == '-'); 288 while ((opt = getopt(argc, argv, "28df:lL:qS:uUv")) != -1) { 289 switch (opt) { 290 case '2': 291 flags |= IDENTIFY_256COLOURS; 292 flags &= ~IDENTIFY_88COLOURS; 293 break; 294 case '8': 295 flags |= IDENTIFY_88COLOURS; 296 flags &= ~IDENTIFY_256COLOURS; 297 break; 298 case 'd': 299 flags |= IDENTIFY_HASDEFAULTS; 300 break; 301 case 'f': 302 if (cfg_file != NULL) 303 xfree(cfg_file); 304 cfg_file = xstrdup(optarg); 305 break; 306 case 'l': 307 login_shell = 1; 308 break; 309 case 'L': 310 if (label != NULL) 311 xfree(label); 312 label = xstrdup(optarg); 313 break; 314 case 'q': 315 be_quiet = 1; 316 break; 317 case 'S': 318 if (path != NULL) 319 xfree(path); 320 path = xstrdup(optarg); 321 break; 322 case 'u': 323 flags |= IDENTIFY_UTF8; 324 break; 325 case 'v': 326 debug_level++; 327 break; 328 default: 329 usage(); 330 } 331 } 332 argc -= optind; 333 argv += optind; 334 335 log_open_tty(debug_level); 336 siginit(); 337 338 if (!(flags & IDENTIFY_UTF8)) { 339 /* 340 * If the user has set whichever of LC_ALL, LC_CTYPE or LANG 341 * exist (in that order) to contain UTF-8, it is a safe 342 * assumption that either they are using a UTF-8 terminal, or 343 * if not they know that output from UTF-8-capable programs may 344 * be wrong. 345 */ 346 if ((s = getenv("LC_ALL")) == NULL) { 347 if ((s = getenv("LC_CTYPE")) == NULL) 348 s = getenv("LANG"); 349 } 350 if (s != NULL && (strcasestr(s, "UTF-8") != NULL || 351 strcasestr(s, "UTF8") != NULL)) 352 flags |= IDENTIFY_UTF8; 353 } 354 355 environ_init(&global_environ); 356 for (var = environ; *var != NULL; var++) 357 environ_put(&global_environ, *var); 358 359 options_init(&global_s_options, NULL); 360 so = &global_s_options; 361 options_set_number(so, "base-index", 0); 362 options_set_number(so, "bell-action", BELL_ANY); 363 options_set_number(so, "buffer-limit", 9); 364 options_set_string(so, "default-command", "%s", ""); 365 options_set_string(so, "default-shell", "%s", getshell()); 366 options_set_string(so, "default-terminal", "screen"); 367 options_set_number(so, "display-panes-colour", 4); 368 options_set_number(so, "display-panes-time", 1000); 369 options_set_number(so, "display-time", 750); 370 options_set_number(so, "history-limit", 2000); 371 options_set_number(so, "lock-after-time", 0); 372 options_set_string(so, "lock-command", "lock -np"); 373 options_set_number(so, "message-attr", 0); 374 options_set_number(so, "message-bg", 3); 375 options_set_number(so, "message-fg", 0); 376 options_set_number(so, "repeat-time", 500); 377 options_set_number(so, "set-remain-on-exit", 0); 378 options_set_number(so, "set-titles", 0); 379 options_set_string(so, "set-titles-string", "#S:#I:#W - \"#T\""); 380 options_set_number(so, "status", 1); 381 options_set_number(so, "status-attr", 0); 382 options_set_number(so, "status-bg", 2); 383 options_set_number(so, "status-fg", 0); 384 options_set_number(so, "status-interval", 15); 385 options_set_number(so, "status-justify", 0); 386 options_set_number(so, "status-keys", MODEKEY_EMACS); 387 options_set_string(so, "status-left", "[#S]"); 388 options_set_number(so, "status-left-attr", 0); 389 options_set_number(so, "status-left-bg", 8); 390 options_set_number(so, "status-left-fg", 8); 391 options_set_number(so, "status-left-length", 10); 392 options_set_string(so, "status-right", "\"#22T\" %%H:%%M %%d-%%b-%%y"); 393 options_set_number(so, "status-right-attr", 0); 394 options_set_number(so, "status-right-bg", 8); 395 options_set_number(so, "status-right-fg", 8); 396 options_set_number(so, "status-right-length", 40); 397 options_set_string(so, "terminal-overrides", 398 "*88col*:colors=88,*256col*:colors=256"); 399 options_set_string(so, "update-environment", "DISPLAY " 400 "WINDOWID SSH_ASKPASS SSH_AUTH_SOCK SSH_AGENT_PID SSH_CONNECTION"); 401 options_set_number(so, "visual-activity", 0); 402 options_set_number(so, "visual-bell", 0); 403 options_set_number(so, "visual-content", 0); 404 405 keylist = xmalloc(sizeof *keylist); 406 ARRAY_INIT(keylist); 407 ARRAY_ADD(keylist, '\002'); 408 options_set_data(so, "prefix", keylist, xfree); 409 410 options_init(&global_w_options, NULL); 411 wo = &global_w_options; 412 options_set_number(wo, "aggressive-resize", 0); 413 options_set_number(wo, "automatic-rename", 1); 414 options_set_number(wo, "clock-mode-colour", 4); 415 options_set_number(wo, "clock-mode-style", 1); 416 options_set_number(wo, "force-height", 0); 417 options_set_number(wo, "force-width", 0); 418 options_set_number(wo, "main-pane-height", 24); 419 options_set_number(wo, "main-pane-width", 81); 420 options_set_number(wo, "mode-attr", 0); 421 options_set_number(wo, "mode-bg", 3); 422 options_set_number(wo, "mode-fg", 0); 423 options_set_number(wo, "mode-keys", MODEKEY_EMACS); 424 options_set_number(wo, "mode-mouse", 0); 425 options_set_number(wo, "monitor-activity", 0); 426 options_set_string(wo, "monitor-content", "%s", ""); 427 options_set_number(wo, "window-status-attr", 0); 428 options_set_number(wo, "window-status-bg", 8); 429 options_set_number(wo, "window-status-current-attr", 0); 430 options_set_number(wo, "window-status-current-bg", 8); 431 options_set_number(wo, "window-status-current-fg", 8); 432 options_set_number(wo, "window-status-fg", 8); 433 options_set_number(wo, "xterm-keys", 0); 434 options_set_number(wo, "remain-on-exit", 0); 435 436 if (flags & IDENTIFY_UTF8) { 437 options_set_number(so, "status-utf8", 1); 438 options_set_number(wo, "utf8", 1); 439 } else { 440 options_set_number(so, "status-utf8", 0); 441 options_set_number(wo, "utf8", 0); 442 } 443 444 if (getcwd(cwd, sizeof cwd) == NULL) { 445 pw = getpwuid(getuid()); 446 if (pw->pw_dir != NULL && *pw->pw_dir != '\0') 447 strlcpy(cwd, pw->pw_dir, sizeof cwd); 448 else 449 strlcpy(cwd, "/", sizeof cwd); 450 } 451 options_set_string(so, "default-path", "%s", cwd); 452 453 if (cfg_file == NULL) { 454 home = getenv("HOME"); 455 if (home == NULL || *home == '\0') { 456 pw = getpwuid(getuid()); 457 if (pw != NULL) 458 home = pw->pw_dir; 459 } 460 xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG); 461 if (access(cfg_file, R_OK) != 0) { 462 xfree(cfg_file); 463 cfg_file = NULL; 464 } 465 } else { 466 if (access(cfg_file, R_OK) != 0) { 467 log_warn("%s", cfg_file); 468 exit(1); 469 } 470 } 471 472 if (label == NULL) 473 label = xstrdup("default"); 474 if (path == NULL && (path = makesockpath(label)) == NULL) { 475 log_warn("can't create socket"); 476 exit(1); 477 } 478 xfree(label); 479 480 if (prepare_cmd(&msg, &buf, &len, argc, argv) != 0) 481 exit(1); 482 483 if (argc == 0) /* new-session is the default */ 484 cmdflags |= CMD_STARTSERVER|CMD_SENDENVIRON; 485 else { 486 /* 487 * It sucks parsing the command string twice (in client and 488 * later in server) but it is necessary to get the start server 489 * flag. 490 */ 491 if ((cmdlist = cmd_list_parse(argc, argv, &cause)) == NULL) { 492 log_warnx("%s", cause); 493 exit(1); 494 } 495 cmdflags &= ~CMD_STARTSERVER; 496 TAILQ_FOREACH(cmd, cmdlist, qentry) { 497 if (cmd->entry->flags & CMD_STARTSERVER) 498 cmdflags |= CMD_STARTSERVER; 499 if (cmd->entry->flags & CMD_SENDENVIRON) 500 cmdflags |= CMD_SENDENVIRON; 501 } 502 cmd_list_free(cmdlist); 503 } 504 505 memset(&cctx, 0, sizeof cctx); 506 if (client_init(path, &cctx, cmdflags, flags) != 0) 507 exit(1); 508 xfree(path); 509 510 client_write_server(&cctx, msg, buf, len); 511 memset(buf, 0, len); 512 513 retcode = 0; 514 for (;;) { 515 pfd.fd = cctx.ibuf.fd; 516 pfd.events = POLLIN; 517 if (cctx.ibuf.w.queued != 0) 518 pfd.events |= POLLOUT; 519 520 if ((nfds = poll(&pfd, 1, INFTIM)) == -1) { 521 if (errno == EAGAIN || errno == EINTR) 522 continue; 523 fatal("poll failed"); 524 } 525 if (nfds == 0) 526 continue; 527 528 if (pfd.revents & (POLLERR|POLLHUP|POLLNVAL)) 529 fatalx("socket error"); 530 531 if (pfd.revents & POLLIN) { 532 if (dispatch_imsg(&cctx, &retcode) != 0) 533 break; 534 } 535 536 if (pfd.revents & POLLOUT) { 537 if (msgbuf_write(&cctx.ibuf.w) < 0) 538 fatalx("msgbuf_write failed"); 539 } 540 } 541 542 options_free(&global_s_options); 543 options_free(&global_w_options); 544 545 return (retcode); 546} 547 548int 549dispatch_imsg(struct client_ctx *cctx, int *retcode) 550{ 551 struct imsg imsg; 552 ssize_t n, datalen; 553 struct msg_print_data printdata; 554 555 if ((n = imsg_read(&cctx->ibuf)) == -1 || n == 0) 556 fatalx("imsg_read failed"); 557 558 for (;;) { 559 if ((n = imsg_get(&cctx->ibuf, &imsg)) == -1) 560 fatalx("imsg_get failed"); 561 if (n == 0) 562 return (0); 563 datalen = imsg.hdr.len - IMSG_HEADER_SIZE; 564 565 switch (imsg.hdr.type) { 566 case MSG_EXIT: 567 case MSG_SHUTDOWN: 568 if (datalen != 0) 569 fatalx("bad MSG_EXIT size"); 570 571 return (-1); 572 case MSG_ERROR: 573 *retcode = 1; 574 /* FALLTHROUGH */ 575 case MSG_PRINT: 576 if (datalen != sizeof printdata) 577 fatalx("bad MSG_PRINT size"); 578 memcpy(&printdata, imsg.data, sizeof printdata); 579 printdata.msg[(sizeof printdata.msg) - 1] = '\0'; 580 581 log_info("%s", printdata.msg); 582 break; 583 case MSG_READY: 584 if (datalen != 0) 585 fatalx("bad MSG_READY size"); 586 587 *retcode = client_main(cctx); 588 return (-1); 589 case MSG_VERSION: 590 if (datalen != 0) 591 fatalx("bad MSG_VERSION size"); 592 593 log_warnx("protocol version mismatch (client %u, " 594 "server %u)", PROTOCOL_VERSION, imsg.hdr.peerid); 595 *retcode = 1; 596 return (-1); 597 default: 598 fatalx("unexpected message"); 599 } 600 601 imsg_free(&imsg); 602 } 603} 604