1 /* $OpenBSD: tmux.c,v 1.63 2009/12/10 09:16:52 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, 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", 0); 320 321 options_init(&global_s_options, NULL); 322 so = &global_s_options; 323 options_set_number(so, "base-index", 0); 324 options_set_number(so, "bell-action", BELL_ANY); 325 options_set_number(so, "buffer-limit", 9); 326 options_set_string(so, "default-command", "%s", ""); 327 options_set_string(so, "default-shell", "%s", getshell()); 328 options_set_string(so, "default-terminal", "screen"); 329 options_set_number(so, "display-panes-colour", 4); 330 options_set_number(so, "display-panes-time", 1000); 331 options_set_number(so, "display-time", 750); 332 options_set_number(so, "history-limit", 2000); 333 options_set_number(so, "lock-after-time", 0); 334 options_set_string(so, "lock-command", "lock -np"); 335 options_set_number(so, "lock-server", 1); 336 options_set_number(so, "message-attr", 0); 337 options_set_number(so, "message-bg", 3); 338 options_set_number(so, "message-fg", 0); 339 options_set_number(so, "message-limit", 20); 340 options_set_number(so, "mouse-select-pane", 0); 341 options_set_number(so, "repeat-time", 500); 342 options_set_number(so, "set-remain-on-exit", 0); 343 options_set_number(so, "set-titles", 0); 344 options_set_string(so, "set-titles-string", "#S:#I:#W - \"#T\""); 345 options_set_number(so, "status", 1); 346 options_set_number(so, "status-attr", 0); 347 options_set_number(so, "status-bg", 2); 348 options_set_number(so, "status-fg", 0); 349 options_set_number(so, "status-interval", 15); 350 options_set_number(so, "status-justify", 0); 351 options_set_number(so, "status-keys", MODEKEY_EMACS); 352 options_set_string(so, "status-left", "[#S]"); 353 options_set_number(so, "status-left-attr", 0); 354 options_set_number(so, "status-left-bg", 8); 355 options_set_number(so, "status-left-fg", 8); 356 options_set_number(so, "status-left-length", 10); 357 options_set_string(so, "status-right", "\"#22T\" %%H:%%M %%d-%%b-%%y"); 358 options_set_number(so, "status-right-attr", 0); 359 options_set_number(so, "status-right-bg", 8); 360 options_set_number(so, "status-right-fg", 8); 361 options_set_number(so, "status-right-length", 40); 362 options_set_string(so, "terminal-overrides", 363 "*88col*:colors=88,*256col*:colors=256"); 364 options_set_string(so, "update-environment", "DISPLAY " 365 "WINDOWID SSH_ASKPASS SSH_AUTH_SOCK SSH_AGENT_PID SSH_CONNECTION"); 366 options_set_number(so, "visual-activity", 0); 367 options_set_number(so, "visual-bell", 0); 368 options_set_number(so, "visual-content", 0); 369 370 keylist = xmalloc(sizeof *keylist); 371 ARRAY_INIT(keylist); 372 ARRAY_ADD(keylist, '\002'); 373 options_set_data(so, "prefix", keylist, xfree); 374 375 options_init(&global_w_options, NULL); 376 wo = &global_w_options; 377 options_set_number(wo, "aggressive-resize", 0); 378 options_set_number(wo, "automatic-rename", 1); 379 options_set_number(wo, "clock-mode-colour", 4); 380 options_set_number(wo, "clock-mode-style", 1); 381 options_set_number(wo, "force-height", 0); 382 options_set_number(wo, "force-width", 0); 383 options_set_number(wo, "main-pane-height", 24); 384 options_set_number(wo, "main-pane-width", 81); 385 options_set_number(wo, "mode-attr", 0); 386 options_set_number(wo, "mode-bg", 3); 387 options_set_number(wo, "mode-fg", 0); 388 options_set_number(wo, "mode-keys", MODEKEY_EMACS); 389 options_set_number(wo, "mode-mouse", 0); 390 options_set_number(wo, "monitor-activity", 0); 391 options_set_string(wo, "monitor-content", "%s", ""); 392 options_set_number(wo, "window-status-attr", 0); 393 options_set_number(wo, "window-status-bg", 8); 394 options_set_number(wo, "window-status-current-attr", 0); 395 options_set_number(wo, "window-status-current-bg", 8); 396 options_set_number(wo, "window-status-current-fg", 8); 397 options_set_number(wo, "window-status-fg", 8); 398 options_set_string(wo, "window-status-format", "#I:#W#F"); 399 options_set_string(wo, "window-status-current-format", "#I:#W#F"); 400 options_set_number(wo, "xterm-keys", 0); 401 options_set_number(wo, "remain-on-exit", 0); 402 options_set_number(wo, "synchronize-panes", 0); 403 404 if (flags & IDENTIFY_UTF8) { 405 options_set_number(so, "status-utf8", 1); 406 options_set_number(wo, "utf8", 1); 407 } else { 408 options_set_number(so, "status-utf8", 0); 409 options_set_number(wo, "utf8", 0); 410 } 411 412 if (getcwd(cwd, sizeof cwd) == NULL) { 413 pw = getpwuid(getuid()); 414 if (pw->pw_dir != NULL && *pw->pw_dir != '\0') 415 strlcpy(cwd, pw->pw_dir, sizeof cwd); 416 else 417 strlcpy(cwd, "/", sizeof cwd); 418 } 419 options_set_string(so, "default-path", "%s", cwd); 420 421 if (cfg_file == NULL) { 422 home = getenv("HOME"); 423 if (home == NULL || *home == '\0') { 424 pw = getpwuid(getuid()); 425 if (pw != NULL) 426 home = pw->pw_dir; 427 } 428 xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG); 429 if (access(cfg_file, R_OK) != 0) { 430 xfree(cfg_file); 431 cfg_file = NULL; 432 } 433 } else { 434 if (access(cfg_file, R_OK) != 0) { 435 log_warn("%s", cfg_file); 436 exit(1); 437 } 438 } 439 440 if (label == NULL) 441 label = xstrdup("default"); 442 if (path == NULL && (path = makesockpath(label)) == NULL) { 443 log_warn("can't create socket"); 444 exit(1); 445 } 446 xfree(label); 447 448 if (shellcmd != NULL) { 449 msg = MSG_SHELL; 450 buf = NULL; 451 len = 0; 452 } else { 453 fill_session(&cmddata); 454 455 cmddata.argc = argc; 456 if (cmd_pack_argv( 457 argc, argv, cmddata.argv, sizeof cmddata.argv) != 0) { 458 log_warnx("command too long"); 459 exit(1); 460 } 461 462 msg = MSG_COMMAND; 463 buf = &cmddata; 464 len = sizeof cmddata; 465 } 466 467 if (shellcmd != NULL) 468 cmdflags |= CMD_STARTSERVER; 469 else if (argc == 0) /* new-session is the default */ 470 cmdflags |= CMD_STARTSERVER|CMD_SENDENVIRON; 471 else { 472 /* 473 * It sucks parsing the command string twice (in client and 474 * later in server) but it is necessary to get the start server 475 * flag. 476 */ 477 if ((cmdlist = cmd_list_parse(argc, argv, &cause)) == NULL) { 478 log_warnx("%s", cause); 479 exit(1); 480 } 481 cmdflags &= ~CMD_STARTSERVER; 482 TAILQ_FOREACH(cmd, cmdlist, qentry) { 483 if (cmd->entry->flags & CMD_STARTSERVER) 484 cmdflags |= CMD_STARTSERVER; 485 if (cmd->entry->flags & CMD_SENDENVIRON) 486 cmdflags |= CMD_SENDENVIRON; 487 } 488 cmd_list_free(cmdlist); 489 } 490 491 if ((main_ibuf = client_init(path, cmdflags, flags)) == NULL) 492 exit(1); 493 xfree(path); 494 495 event_init(); 496 497 imsg_compose(main_ibuf, msg, PROTOCOL_VERSION, -1, -1, buf, len); 498 499 main_set_signals(); 500 501 events = EV_READ; 502 if (main_ibuf->w.queued > 0) 503 events |= EV_WRITE; 504 event_once(main_ibuf->fd, events, main_callback, shellcmd, NULL); 505 506 main_exitval = 0; 507 event_dispatch(); 508 509 main_clear_signals(); 510 511 client_main(); /* doesn't return */ 512 } 513 514 void 515 main_set_signals(void) 516 { 517 struct sigaction sigact; 518 519 memset(&sigact, 0, sizeof sigact); 520 sigemptyset(&sigact.sa_mask); 521 sigact.sa_flags = SA_RESTART; 522 sigact.sa_handler = SIG_IGN; 523 if (sigaction(SIGINT, &sigact, NULL) != 0) 524 fatal("sigaction failed"); 525 if (sigaction(SIGPIPE, &sigact, NULL) != 0) 526 fatal("sigaction failed"); 527 if (sigaction(SIGUSR1, &sigact, NULL) != 0) 528 fatal("sigaction failed"); 529 if (sigaction(SIGUSR2, &sigact, NULL) != 0) 530 fatal("sigaction failed"); 531 if (sigaction(SIGTSTP, &sigact, NULL) != 0) 532 fatal("sigaction failed"); 533 534 signal_set(&main_ev_sigterm, SIGTERM, main_signal, NULL); 535 signal_add(&main_ev_sigterm, NULL); 536 } 537 538 void 539 main_clear_signals(void) 540 { 541 struct sigaction sigact; 542 543 memset(&sigact, 0, sizeof sigact); 544 sigemptyset(&sigact.sa_mask); 545 sigact.sa_flags = SA_RESTART; 546 sigact.sa_handler = SIG_DFL; 547 if (sigaction(SIGINT, &sigact, NULL) != 0) 548 fatal("sigaction failed"); 549 if (sigaction(SIGPIPE, &sigact, NULL) != 0) 550 fatal("sigaction failed"); 551 if (sigaction(SIGUSR1, &sigact, NULL) != 0) 552 fatal("sigaction failed"); 553 if (sigaction(SIGUSR2, &sigact, NULL) != 0) 554 fatal("sigaction failed"); 555 if (sigaction(SIGTSTP, &sigact, NULL) != 0) 556 fatal("sigaction failed"); 557 558 event_del(&main_ev_sigterm); 559 } 560 561 /* ARGSUSED */ 562 void 563 main_signal(int sig, unused short events, unused void *data) 564 { 565 switch (sig) { 566 case SIGTERM: 567 exit(1); 568 } 569 } 570 571 /* ARGSUSED */ 572 void 573 main_callback(unused int fd, short events, void *data) 574 { 575 char *shellcmd = data; 576 577 if (events & EV_READ) 578 main_dispatch(shellcmd); 579 580 if (events & EV_WRITE) { 581 if (msgbuf_write(&main_ibuf->w) < 0) 582 fatalx("msgbuf_write failed"); 583 } 584 585 events = EV_READ; 586 if (main_ibuf->w.queued > 0) 587 events |= EV_WRITE; 588 event_once(main_ibuf->fd, events, main_callback, shellcmd, NULL); 589 } 590 591 void 592 main_dispatch(const char *shellcmd) 593 { 594 struct imsg imsg; 595 ssize_t n, datalen; 596 struct msg_print_data printdata; 597 struct msg_shell_data shelldata; 598 599 if ((n = imsg_read(main_ibuf)) == -1 || n == 0) 600 fatalx("imsg_read failed"); 601 602 for (;;) { 603 if ((n = imsg_get(main_ibuf, &imsg)) == -1) 604 fatalx("imsg_get failed"); 605 if (n == 0) 606 return; 607 datalen = imsg.hdr.len - IMSG_HEADER_SIZE; 608 609 switch (imsg.hdr.type) { 610 case MSG_EXIT: 611 case MSG_SHUTDOWN: 612 if (datalen != 0) 613 fatalx("bad MSG_EXIT size"); 614 615 exit(main_exitval); 616 case MSG_ERROR: 617 case MSG_PRINT: 618 if (datalen != sizeof printdata) 619 fatalx("bad MSG_PRINT size"); 620 memcpy(&printdata, imsg.data, sizeof printdata); 621 printdata.msg[(sizeof printdata.msg) - 1] = '\0'; 622 623 log_info("%s", printdata.msg); 624 if (imsg.hdr.type == MSG_ERROR) 625 main_exitval = 1; 626 break; 627 case MSG_READY: 628 if (datalen != 0) 629 fatalx("bad MSG_READY size"); 630 631 event_loopexit(NULL); /* move to client_main() */ 632 break; 633 case MSG_VERSION: 634 if (datalen != 0) 635 fatalx("bad MSG_VERSION size"); 636 637 log_warnx("protocol version mismatch (client %u, " 638 "server %u)", PROTOCOL_VERSION, imsg.hdr.peerid); 639 exit(1); 640 case MSG_SHELL: 641 if (datalen != sizeof shelldata) 642 fatalx("bad MSG_SHELL size"); 643 memcpy(&shelldata, imsg.data, sizeof shelldata); 644 shelldata.shell[(sizeof shelldata.shell) - 1] = '\0'; 645 646 main_clear_signals(); 647 648 shell_exec(shelldata.shell, shellcmd); 649 default: 650 fatalx("unexpected message"); 651 } 652 653 imsg_free(&imsg); 654 } 655 } 656