1 /* $OpenBSD: tmux.c,v 1.69 2010/02/06 17:15:33 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 <event.h> 24 #include <paths.h> 25 #include <pwd.h> 26 #include <signal.h> 27 #include <stdlib.h> 28 #include <string.h> 29 #include <syslog.h> 30 #include <unistd.h> 31 32 #include "tmux.h" 33 34 #ifdef DEBUG 35 extern char *malloc_options; 36 #endif 37 38 char *cfg_file; 39 struct options global_options; /* server options */ 40 struct options global_s_options; /* session options */ 41 struct options global_w_options; /* window options */ 42 struct environ global_environ; 43 44 int debug_level; 45 time_t start_time; 46 char *socket_path; 47 int login_shell; 48 49 __dead void usage(void); 50 void fill_session(struct msg_command_data *); 51 char *makesockpath(const char *); 52 __dead void shell_exec(const char *, const char *); 53 54 struct imsgbuf *main_ibuf; 55 struct event main_ev_sigterm; 56 int main_exitval; 57 58 void main_set_signals(void); 59 void main_clear_signals(void); 60 void main_signal(int, short, unused void *); 61 void main_callback(int, short, void *); 62 void main_dispatch(const char *); 63 64 __dead void 65 usage(void) 66 { 67 fprintf(stderr, 68 "usage: %s [-28lquv] [-c shell-command] [-f file] [-L socket-name]\n" 69 " [-S socket-path] [command [flags]]\n", 70 __progname); 71 exit(1); 72 } 73 74 void 75 logfile(const char *name) 76 { 77 char *path; 78 79 log_close(); 80 if (debug_level > 0) { 81 xasprintf(&path, "tmux-%s-%ld.log", name, (long) getpid()); 82 log_open_file(debug_level, path); 83 xfree(path); 84 } 85 } 86 87 const char * 88 getshell(void) 89 { 90 struct passwd *pw; 91 const char *shell; 92 93 shell = getenv("SHELL"); 94 if (checkshell(shell)) 95 return (shell); 96 97 pw = getpwuid(getuid()); 98 if (pw != NULL && checkshell(pw->pw_shell)) 99 return (pw->pw_shell); 100 101 return (_PATH_BSHELL); 102 } 103 104 int 105 checkshell(const char *shell) 106 { 107 if (shell == NULL || *shell == '\0' || areshell(shell)) 108 return (0); 109 if (access(shell, X_OK) != 0) 110 return (0); 111 return (1); 112 } 113 114 int 115 areshell(const char *shell) 116 { 117 const char *progname, *ptr; 118 119 if ((ptr = strrchr(shell, '/')) != NULL) 120 ptr++; 121 else 122 ptr = shell; 123 progname = __progname; 124 if (*progname == '-') 125 progname++; 126 if (strcmp(ptr, progname) == 0) 127 return (1); 128 return (0); 129 } 130 131 void 132 fill_session(struct msg_command_data *data) 133 { 134 char *env, *ptr1, *ptr2, buf[256]; 135 size_t len; 136 const char *errstr; 137 long long ll; 138 139 data->pid = -1; 140 if ((env = getenv("TMUX")) == NULL) 141 return; 142 143 if ((ptr2 = strrchr(env, ',')) == NULL || ptr2 == env) 144 return; 145 for (ptr1 = ptr2 - 1; ptr1 > env && *ptr1 != ','; ptr1--) 146 ; 147 if (*ptr1 != ',') 148 return; 149 ptr1++; 150 ptr2++; 151 152 len = ptr2 - ptr1 - 1; 153 if (len > (sizeof buf) - 1) 154 return; 155 memcpy(buf, ptr1, len); 156 buf[len] = '\0'; 157 158 ll = strtonum(buf, 0, LONG_MAX, &errstr); 159 if (errstr != NULL) 160 return; 161 data->pid = ll; 162 163 ll = strtonum(ptr2, 0, UINT_MAX, &errstr); 164 if (errstr != NULL) 165 return; 166 data->idx = ll; 167 } 168 169 char * 170 makesockpath(const char *label) 171 { 172 char base[MAXPATHLEN], *path; 173 struct stat sb; 174 u_int uid; 175 176 uid = getuid(); 177 xsnprintf(base, MAXPATHLEN, "%s/tmux-%d", _PATH_TMP, uid); 178 179 if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST) 180 return (NULL); 181 182 if (lstat(base, &sb) != 0) 183 return (NULL); 184 if (!S_ISDIR(sb.st_mode)) { 185 errno = ENOTDIR; 186 return (NULL); 187 } 188 if (sb.st_uid != uid || (sb.st_mode & (S_IRWXG|S_IRWXO)) != 0) { 189 errno = EACCES; 190 return (NULL); 191 } 192 193 xasprintf(&path, "%s/%s", base, label); 194 return (path); 195 } 196 197 __dead void 198 shell_exec(const char *shell, const char *shellcmd) 199 { 200 const char *shellname, *ptr; 201 char *argv0; 202 203 ptr = strrchr(shell, '/'); 204 if (ptr != NULL && *(ptr + 1) != '\0') 205 shellname = ptr + 1; 206 else 207 shellname = shell; 208 if (login_shell) 209 xasprintf(&argv0, "-%s", shellname); 210 else 211 xasprintf(&argv0, "%s", shellname); 212 setenv("SHELL", shell, 1); 213 214 execl(shell, argv0, "-c", shellcmd, (char *) NULL); 215 fatal("execl failed"); 216 } 217 218 int 219 main(int argc, char **argv) 220 { 221 struct cmd_list *cmdlist; 222 struct cmd *cmd; 223 enum msgtype msg; 224 struct passwd *pw; 225 struct options *oo, *so, *wo; 226 struct keylist *keylist; 227 struct msg_command_data cmddata; 228 char *s, *shellcmd, *path, *label, *home, *cause; 229 char cwd[MAXPATHLEN], **var; 230 void *buf; 231 size_t len; 232 int opt, flags, quiet = 0, cmdflags = 0; 233 short events; 234 235 #ifdef DEBUG 236 malloc_options = (char *) "AFGJPX"; 237 #endif 238 239 flags = 0; 240 shellcmd = label = path = NULL; 241 login_shell = (**argv == '-'); 242 while ((opt = getopt(argc, argv, "28c:df:lL:qS:uUv")) != -1) { 243 switch (opt) { 244 case '2': 245 flags |= IDENTIFY_256COLOURS; 246 flags &= ~IDENTIFY_88COLOURS; 247 break; 248 case '8': 249 flags |= IDENTIFY_88COLOURS; 250 flags &= ~IDENTIFY_256COLOURS; 251 break; 252 case 'c': 253 if (shellcmd != NULL) 254 xfree(shellcmd); 255 shellcmd = xstrdup(optarg); 256 break; 257 case 'f': 258 if (cfg_file != NULL) 259 xfree(cfg_file); 260 cfg_file = xstrdup(optarg); 261 break; 262 case 'l': 263 login_shell = 1; 264 break; 265 case 'L': 266 if (label != NULL) 267 xfree(label); 268 label = xstrdup(optarg); 269 break; 270 case 'q': 271 quiet = 1; 272 break; 273 case 'S': 274 if (path != NULL) 275 xfree(path); 276 path = xstrdup(optarg); 277 break; 278 case 'u': 279 flags |= IDENTIFY_UTF8; 280 break; 281 case 'v': 282 debug_level++; 283 break; 284 default: 285 usage(); 286 } 287 } 288 argc -= optind; 289 argv += optind; 290 291 if (shellcmd != NULL && argc != 0) 292 usage(); 293 294 log_open_tty(debug_level); 295 296 if (!(flags & IDENTIFY_UTF8)) { 297 /* 298 * If the user has set whichever of LC_ALL, LC_CTYPE or LANG 299 * exist (in that order) to contain UTF-8, it is a safe 300 * assumption that either they are using a UTF-8 terminal, or 301 * if not they know that output from UTF-8-capable programs may 302 * be wrong. 303 */ 304 if ((s = getenv("LC_ALL")) == NULL) { 305 if ((s = getenv("LC_CTYPE")) == NULL) 306 s = getenv("LANG"); 307 } 308 if (s != NULL && (strcasestr(s, "UTF-8") != NULL || 309 strcasestr(s, "UTF8") != NULL)) 310 flags |= IDENTIFY_UTF8; 311 } 312 313 environ_init(&global_environ); 314 for (var = environ; *var != NULL; var++) 315 environ_put(&global_environ, *var); 316 317 options_init(&global_options, NULL); 318 oo = &global_options; 319 options_set_number(oo, "quiet", quiet); 320 options_set_number(oo, "escape-time", 500); 321 322 options_init(&global_s_options, NULL); 323 so = &global_s_options; 324 options_set_number(so, "base-index", 0); 325 options_set_number(so, "bell-action", BELL_ANY); 326 options_set_number(so, "buffer-limit", 9); 327 options_set_string(so, "default-command", "%s", ""); 328 options_set_string(so, "default-shell", "%s", getshell()); 329 options_set_string(so, "default-terminal", "screen"); 330 options_set_number(so, "display-panes-colour", 4); 331 options_set_number(so, "display-panes-active-colour", 1); 332 options_set_number(so, "display-panes-time", 1000); 333 options_set_number(so, "display-time", 750); 334 options_set_number(so, "history-limit", 2000); 335 options_set_number(so, "lock-after-time", 0); 336 options_set_string(so, "lock-command", "lock -np"); 337 options_set_number(so, "lock-server", 1); 338 options_set_number(so, "message-attr", 0); 339 options_set_number(so, "message-bg", 3); 340 options_set_number(so, "message-fg", 0); 341 options_set_number(so, "message-limit", 20); 342 options_set_number(so, "mouse-select-pane", 0); 343 options_set_number(so, "pane-active-border-bg", 2); 344 options_set_number(so, "pane-active-border-fg", 8); 345 options_set_number(so, "pane-border-bg", 8); 346 options_set_number(so, "pane-border-fg", 8); 347 options_set_number(so, "repeat-time", 500); 348 options_set_number(so, "set-remain-on-exit", 0); 349 options_set_number(so, "set-titles", 0); 350 options_set_string(so, "set-titles-string", "#S:#I:#W - \"#T\""); 351 options_set_number(so, "status", 1); 352 options_set_number(so, "status-attr", 0); 353 options_set_number(so, "status-bg", 2); 354 options_set_number(so, "status-fg", 0); 355 options_set_number(so, "status-interval", 15); 356 options_set_number(so, "status-justify", 0); 357 options_set_number(so, "status-keys", MODEKEY_EMACS); 358 options_set_string(so, "status-left", "[#S]"); 359 options_set_number(so, "status-left-attr", 0); 360 options_set_number(so, "status-left-bg", 8); 361 options_set_number(so, "status-left-fg", 8); 362 options_set_number(so, "status-left-length", 10); 363 options_set_string(so, "status-right", "\"#22T\" %%H:%%M %%d-%%b-%%y"); 364 options_set_number(so, "status-right-attr", 0); 365 options_set_number(so, "status-right-bg", 8); 366 options_set_number(so, "status-right-fg", 8); 367 options_set_number(so, "status-right-length", 40); 368 options_set_string(so, "terminal-overrides", 369 "*88col*:colors=88,*256col*:colors=256"); 370 options_set_string(so, "update-environment", "DISPLAY " 371 "WINDOWID SSH_ASKPASS SSH_AUTH_SOCK SSH_AGENT_PID SSH_CONNECTION"); 372 options_set_number(so, "visual-activity", 0); 373 options_set_number(so, "visual-bell", 0); 374 options_set_number(so, "visual-content", 0); 375 376 keylist = xmalloc(sizeof *keylist); 377 ARRAY_INIT(keylist); 378 ARRAY_ADD(keylist, '\002'); 379 options_set_data(so, "prefix", keylist, xfree); 380 381 options_init(&global_w_options, NULL); 382 wo = &global_w_options; 383 options_set_number(wo, "aggressive-resize", 0); 384 options_set_number(wo, "automatic-rename", 1); 385 options_set_number(wo, "clock-mode-colour", 4); 386 options_set_number(wo, "clock-mode-style", 1); 387 options_set_number(wo, "force-height", 0); 388 options_set_number(wo, "force-width", 0); 389 options_set_number(wo, "main-pane-height", 24); 390 options_set_number(wo, "main-pane-width", 81); 391 options_set_number(wo, "mode-attr", 0); 392 options_set_number(wo, "mode-bg", 3); 393 options_set_number(wo, "mode-fg", 0); 394 options_set_number(wo, "mode-keys", MODEKEY_EMACS); 395 options_set_number(wo, "mode-mouse", 0); 396 options_set_number(wo, "monitor-activity", 0); 397 options_set_string(wo, "monitor-content", "%s", ""); 398 options_set_number(wo, "window-status-attr", 0); 399 options_set_number(wo, "window-status-bg", 8); 400 options_set_number(wo, "window-status-current-attr", 0); 401 options_set_number(wo, "window-status-current-bg", 8); 402 options_set_number(wo, "window-status-current-fg", 8); 403 options_set_number(wo, "window-status-fg", 8); 404 options_set_string(wo, "window-status-format", "#I:#W#F"); 405 options_set_string(wo, "window-status-current-format", "#I:#W#F"); 406 options_set_number(wo, "xterm-keys", 0); 407 options_set_number(wo, "remain-on-exit", 0); 408 options_set_number(wo, "synchronize-panes", 0); 409 410 if (flags & IDENTIFY_UTF8) { 411 options_set_number(so, "status-utf8", 1); 412 options_set_number(wo, "utf8", 1); 413 } else { 414 options_set_number(so, "status-utf8", 0); 415 options_set_number(wo, "utf8", 0); 416 } 417 418 if (getcwd(cwd, sizeof cwd) == NULL) { 419 pw = getpwuid(getuid()); 420 if (pw->pw_dir != NULL && *pw->pw_dir != '\0') 421 strlcpy(cwd, pw->pw_dir, sizeof cwd); 422 else 423 strlcpy(cwd, "/", sizeof cwd); 424 } 425 options_set_string(so, "default-path", "%s", cwd); 426 427 if (cfg_file == NULL) { 428 home = getenv("HOME"); 429 if (home == NULL || *home == '\0') { 430 pw = getpwuid(getuid()); 431 if (pw != NULL) 432 home = pw->pw_dir; 433 } 434 xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG); 435 if (access(cfg_file, R_OK) != 0 && errno == ENOENT) { 436 xfree(cfg_file); 437 cfg_file = NULL; 438 } 439 } 440 441 /* 442 * Figure out the socket path. If specified on the command-line with 443 * -S or -L, use it, otherwise try $TMUX or assume -L default. 444 */ 445 if (path == NULL) { 446 /* No -L. Try $TMUX, or default. */ 447 if (label == NULL) { 448 if ((path = getenv("TMUX")) != NULL) { 449 path = xstrdup(path); 450 path[strcspn(path, ",")] = '\0'; 451 } else 452 label = xstrdup("default"); 453 } 454 455 /* -L or default set. */ 456 if (label != NULL) { 457 if ((path = makesockpath(label)) == NULL) { 458 log_warn("can't create socket"); 459 exit(1); 460 } 461 } 462 } 463 if (label != NULL) 464 xfree(label); 465 466 if (shellcmd != NULL) { 467 msg = MSG_SHELL; 468 buf = NULL; 469 len = 0; 470 } else { 471 fill_session(&cmddata); 472 473 cmddata.argc = argc; 474 if (cmd_pack_argv( 475 argc, argv, cmddata.argv, sizeof cmddata.argv) != 0) { 476 log_warnx("command too long"); 477 exit(1); 478 } 479 480 msg = MSG_COMMAND; 481 buf = &cmddata; 482 len = sizeof cmddata; 483 } 484 485 if (shellcmd != NULL) 486 cmdflags |= CMD_STARTSERVER; 487 else if (argc == 0) /* new-session is the default */ 488 cmdflags |= CMD_STARTSERVER|CMD_SENDENVIRON; 489 else { 490 /* 491 * It sucks parsing the command string twice (in client and 492 * later in server) but it is necessary to get the start server 493 * flag. 494 */ 495 if ((cmdlist = cmd_list_parse(argc, argv, &cause)) == NULL) { 496 log_warnx("%s", cause); 497 exit(1); 498 } 499 cmdflags &= ~CMD_STARTSERVER; 500 TAILQ_FOREACH(cmd, cmdlist, qentry) { 501 if (cmd->entry->flags & CMD_STARTSERVER) 502 cmdflags |= CMD_STARTSERVER; 503 if (cmd->entry->flags & CMD_SENDENVIRON) 504 cmdflags |= CMD_SENDENVIRON; 505 } 506 cmd_list_free(cmdlist); 507 } 508 509 if ((main_ibuf = client_init(path, cmdflags, flags)) == NULL) 510 exit(1); 511 xfree(path); 512 513 event_init(); 514 515 imsg_compose(main_ibuf, msg, PROTOCOL_VERSION, -1, -1, buf, len); 516 517 main_set_signals(); 518 519 events = EV_READ; 520 if (main_ibuf->w.queued > 0) 521 events |= EV_WRITE; 522 event_once(main_ibuf->fd, events, main_callback, shellcmd, NULL); 523 524 main_exitval = 0; 525 event_dispatch(); 526 527 main_clear_signals(); 528 529 client_main(); /* doesn't return */ 530 } 531 532 void 533 main_set_signals(void) 534 { 535 struct sigaction sigact; 536 537 memset(&sigact, 0, sizeof sigact); 538 sigemptyset(&sigact.sa_mask); 539 sigact.sa_flags = SA_RESTART; 540 sigact.sa_handler = SIG_IGN; 541 if (sigaction(SIGINT, &sigact, NULL) != 0) 542 fatal("sigaction failed"); 543 if (sigaction(SIGPIPE, &sigact, NULL) != 0) 544 fatal("sigaction failed"); 545 if (sigaction(SIGUSR1, &sigact, NULL) != 0) 546 fatal("sigaction failed"); 547 if (sigaction(SIGUSR2, &sigact, NULL) != 0) 548 fatal("sigaction failed"); 549 if (sigaction(SIGTSTP, &sigact, NULL) != 0) 550 fatal("sigaction failed"); 551 552 signal_set(&main_ev_sigterm, SIGTERM, main_signal, NULL); 553 signal_add(&main_ev_sigterm, NULL); 554 } 555 556 void 557 main_clear_signals(void) 558 { 559 struct sigaction sigact; 560 561 memset(&sigact, 0, sizeof sigact); 562 sigemptyset(&sigact.sa_mask); 563 sigact.sa_flags = SA_RESTART; 564 sigact.sa_handler = SIG_DFL; 565 if (sigaction(SIGINT, &sigact, NULL) != 0) 566 fatal("sigaction failed"); 567 if (sigaction(SIGPIPE, &sigact, NULL) != 0) 568 fatal("sigaction failed"); 569 if (sigaction(SIGUSR1, &sigact, NULL) != 0) 570 fatal("sigaction failed"); 571 if (sigaction(SIGUSR2, &sigact, NULL) != 0) 572 fatal("sigaction failed"); 573 if (sigaction(SIGTSTP, &sigact, NULL) != 0) 574 fatal("sigaction failed"); 575 576 event_del(&main_ev_sigterm); 577 } 578 579 /* ARGSUSED */ 580 void 581 main_signal(int sig, unused short events, unused void *data) 582 { 583 switch (sig) { 584 case SIGTERM: 585 exit(1); 586 } 587 } 588 589 /* ARGSUSED */ 590 void 591 main_callback(unused int fd, short events, void *data) 592 { 593 char *shellcmd = data; 594 595 if (events & EV_READ) 596 main_dispatch(shellcmd); 597 598 if (events & EV_WRITE) { 599 if (msgbuf_write(&main_ibuf->w) < 0) 600 fatalx("msgbuf_write failed"); 601 } 602 603 events = EV_READ; 604 if (main_ibuf->w.queued > 0) 605 events |= EV_WRITE; 606 event_once(main_ibuf->fd, events, main_callback, shellcmd, NULL); 607 } 608 609 void 610 main_dispatch(const char *shellcmd) 611 { 612 struct imsg imsg; 613 ssize_t n, datalen; 614 struct msg_print_data printdata; 615 struct msg_shell_data shelldata; 616 617 if ((n = imsg_read(main_ibuf)) == -1 || n == 0) 618 fatalx("imsg_read failed"); 619 620 for (;;) { 621 if ((n = imsg_get(main_ibuf, &imsg)) == -1) 622 fatalx("imsg_get failed"); 623 if (n == 0) 624 return; 625 datalen = imsg.hdr.len - IMSG_HEADER_SIZE; 626 627 switch (imsg.hdr.type) { 628 case MSG_EXIT: 629 case MSG_SHUTDOWN: 630 if (datalen != 0) 631 fatalx("bad MSG_EXIT size"); 632 633 exit(main_exitval); 634 case MSG_ERROR: 635 case MSG_PRINT: 636 if (datalen != sizeof printdata) 637 fatalx("bad MSG_PRINT size"); 638 memcpy(&printdata, imsg.data, sizeof printdata); 639 printdata.msg[(sizeof printdata.msg) - 1] = '\0'; 640 641 log_info("%s", printdata.msg); 642 if (imsg.hdr.type == MSG_ERROR) 643 main_exitval = 1; 644 break; 645 case MSG_READY: 646 if (datalen != 0) 647 fatalx("bad MSG_READY size"); 648 649 event_loopexit(NULL); /* move to client_main() */ 650 break; 651 case MSG_VERSION: 652 if (datalen != 0) 653 fatalx("bad MSG_VERSION size"); 654 655 log_warnx("protocol version mismatch (client %u, " 656 "server %u)", PROTOCOL_VERSION, imsg.hdr.peerid); 657 exit(1); 658 case MSG_SHELL: 659 if (datalen != sizeof shelldata) 660 fatalx("bad MSG_SHELL size"); 661 memcpy(&shelldata, imsg.data, sizeof shelldata); 662 shelldata.shell[(sizeof shelldata.shell) - 1] = '\0'; 663 664 main_clear_signals(); 665 666 shell_exec(shelldata.shell, shellcmd); 667 default: 668 fatalx("unexpected message"); 669 } 670 671 imsg_free(&imsg); 672 } 673 } 674