1 /* $OpenBSD: tmux.c,v 1.88 2010/09/26 20:43:30 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 #include <sys/wait.h> 22 23 #include <errno.h> 24 #include <event.h> 25 #include <paths.h> 26 #include <pwd.h> 27 #include <signal.h> 28 #include <stdlib.h> 29 #include <string.h> 30 #include <syslog.h> 31 #include <unistd.h> 32 33 #include "tmux.h" 34 35 #ifdef DEBUG 36 extern char *malloc_options; 37 #endif 38 39 char *cfg_file; 40 struct options global_options; /* server options */ 41 struct options global_s_options; /* session options */ 42 struct options global_w_options; /* window options */ 43 struct environ global_environ; 44 45 struct event_base *ev_base; 46 47 int debug_level; 48 time_t start_time; 49 char *socket_path; 50 int login_shell; 51 52 struct env_data { 53 char *path; 54 pid_t pid; 55 u_int idx; 56 }; 57 58 __dead void usage(void); 59 void parse_env(struct env_data *); 60 char *makesockpath(const char *); 61 __dead void shell_exec(const char *, const char *); 62 63 struct imsgbuf *main_ibuf; 64 65 void main_signal(int, short, unused void *); 66 void main_callback(int, short, void *); 67 void main_dispatch(const char *); 68 69 __dead void 70 usage(void) 71 { 72 fprintf(stderr, 73 "usage: %s [-28lquv] [-c shell-command] [-f file] [-L socket-name]\n" 74 " [-S socket-path] [command [flags]]\n", 75 __progname); 76 exit(1); 77 } 78 79 void 80 logfile(const char *name) 81 { 82 char *path; 83 84 log_close(); 85 if (debug_level > 0) { 86 xasprintf(&path, "tmux-%s-%ld.log", name, (long) getpid()); 87 log_open_file(debug_level, path); 88 xfree(path); 89 } 90 } 91 92 const char * 93 getshell(void) 94 { 95 struct passwd *pw; 96 const char *shell; 97 98 shell = getenv("SHELL"); 99 if (checkshell(shell)) 100 return (shell); 101 102 pw = getpwuid(getuid()); 103 if (pw != NULL && checkshell(pw->pw_shell)) 104 return (pw->pw_shell); 105 106 return (_PATH_BSHELL); 107 } 108 109 int 110 checkshell(const char *shell) 111 { 112 if (shell == NULL || *shell == '\0' || areshell(shell)) 113 return (0); 114 if (access(shell, X_OK) != 0) 115 return (0); 116 return (1); 117 } 118 119 int 120 areshell(const char *shell) 121 { 122 const char *progname, *ptr; 123 124 if ((ptr = strrchr(shell, '/')) != NULL) 125 ptr++; 126 else 127 ptr = shell; 128 progname = __progname; 129 if (*progname == '-') 130 progname++; 131 if (strcmp(ptr, progname) == 0) 132 return (1); 133 return (0); 134 } 135 136 void 137 parse_env(struct env_data *data) 138 { 139 char *env, *path_pid, *pid_idx, buf[256]; 140 size_t len; 141 const char *errstr; 142 long long ll; 143 144 data->pid = -1; 145 if ((env = getenv("TMUX")) == NULL) 146 return; 147 148 if ((path_pid = strchr(env, ',')) == NULL || path_pid == env) 149 return; 150 if ((pid_idx = strchr(path_pid + 1, ',')) == NULL) 151 return; 152 if ((pid_idx == path_pid + 1 || pid_idx[1] == '\0')) 153 return; 154 155 /* path */ 156 len = path_pid - env; 157 data->path = xmalloc (len + 1); 158 memcpy(data->path, env, len); 159 data->path[len] = '\0'; 160 161 /* pid */ 162 len = pid_idx - path_pid - 1; 163 if (len > (sizeof buf) - 1) 164 return; 165 memcpy(buf, path_pid + 1, len); 166 buf[len] = '\0'; 167 168 ll = strtonum(buf, 0, LONG_MAX, &errstr); 169 if (errstr != NULL) 170 return; 171 data->pid = ll; 172 173 /* idx */ 174 ll = strtonum(pid_idx+1, 0, UINT_MAX, &errstr); 175 if (errstr != NULL) 176 return; 177 data->idx = ll; 178 } 179 180 char * 181 makesockpath(const char *label) 182 { 183 char base[MAXPATHLEN], *path; 184 struct stat sb; 185 u_int uid; 186 187 uid = getuid(); 188 xsnprintf(base, MAXPATHLEN, "%s/tmux-%d", _PATH_TMP, uid); 189 190 if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST) 191 return (NULL); 192 193 if (lstat(base, &sb) != 0) 194 return (NULL); 195 if (!S_ISDIR(sb.st_mode)) { 196 errno = ENOTDIR; 197 return (NULL); 198 } 199 if (sb.st_uid != uid || (sb.st_mode & (S_IRWXG|S_IRWXO)) != 0) { 200 errno = EACCES; 201 return (NULL); 202 } 203 204 xasprintf(&path, "%s/%s", base, label); 205 return (path); 206 } 207 208 __dead void 209 shell_exec(const char *shell, const char *shellcmd) 210 { 211 const char *shellname, *ptr; 212 char *argv0; 213 214 ptr = strrchr(shell, '/'); 215 if (ptr != NULL && *(ptr + 1) != '\0') 216 shellname = ptr + 1; 217 else 218 shellname = shell; 219 if (login_shell) 220 xasprintf(&argv0, "-%s", shellname); 221 else 222 xasprintf(&argv0, "%s", shellname); 223 setenv("SHELL", shell, 1); 224 225 execl(shell, argv0, "-c", shellcmd, (char *) NULL); 226 fatal("execl failed"); 227 } 228 229 int 230 main(int argc, char **argv) 231 { 232 struct cmd_list *cmdlist; 233 struct cmd *cmd; 234 enum msgtype msg; 235 struct passwd *pw; 236 struct options *oo, *so, *wo; 237 struct keylist *keylist; 238 struct env_data envdata; 239 struct msg_command_data cmddata; 240 char *s, *shellcmd, *path, *label, *home, *cause; 241 char **var; 242 void *buf; 243 size_t len; 244 int opt, flags, quiet = 0, cmdflags = 0; 245 short events; 246 247 #ifdef DEBUG 248 malloc_options = (char *) "AFGJPX"; 249 #endif 250 251 flags = 0; 252 shellcmd = label = path = NULL; 253 envdata.path = NULL; 254 login_shell = (**argv == '-'); 255 while ((opt = getopt(argc, argv, "28c:df:lL:qS:uUv")) != -1) { 256 switch (opt) { 257 case '2': 258 flags |= IDENTIFY_256COLOURS; 259 flags &= ~IDENTIFY_88COLOURS; 260 break; 261 case '8': 262 flags |= IDENTIFY_88COLOURS; 263 flags &= ~IDENTIFY_256COLOURS; 264 break; 265 case 'c': 266 if (shellcmd != NULL) 267 xfree(shellcmd); 268 shellcmd = xstrdup(optarg); 269 break; 270 case 'f': 271 if (cfg_file != NULL) 272 xfree(cfg_file); 273 cfg_file = xstrdup(optarg); 274 break; 275 case 'l': 276 login_shell = 1; 277 break; 278 case 'L': 279 if (label != NULL) 280 xfree(label); 281 label = xstrdup(optarg); 282 break; 283 case 'q': 284 quiet = 1; 285 break; 286 case 'S': 287 if (path != NULL) 288 xfree(path); 289 path = xstrdup(optarg); 290 break; 291 case 'u': 292 flags |= IDENTIFY_UTF8; 293 break; 294 case 'v': 295 debug_level++; 296 break; 297 default: 298 usage(); 299 } 300 } 301 argc -= optind; 302 argv += optind; 303 304 if (shellcmd != NULL && argc != 0) 305 usage(); 306 307 log_open_tty(debug_level); 308 309 if (!(flags & IDENTIFY_UTF8)) { 310 /* 311 * If the user has set whichever of LC_ALL, LC_CTYPE or LANG 312 * exist (in that order) to contain UTF-8, it is a safe 313 * assumption that either they are using a UTF-8 terminal, or 314 * if not they know that output from UTF-8-capable programs may 315 * be wrong. 316 */ 317 if ((s = getenv("LC_ALL")) == NULL) { 318 if ((s = getenv("LC_CTYPE")) == NULL) 319 s = getenv("LANG"); 320 } 321 if (s != NULL && (strcasestr(s, "UTF-8") != NULL || 322 strcasestr(s, "UTF8") != NULL)) 323 flags |= IDENTIFY_UTF8; 324 } 325 326 environ_init(&global_environ); 327 for (var = environ; *var != NULL; var++) 328 environ_put(&global_environ, *var); 329 330 options_init(&global_options, NULL); 331 oo = &global_options; 332 options_set_number(oo, "quiet", quiet); 333 options_set_number(oo, "escape-time", 500); 334 options_set_number(oo, "exit-unattached", 0); 335 336 options_init(&global_s_options, NULL); 337 so = &global_s_options; 338 options_set_number(so, "base-index", 0); 339 options_set_number(so, "bell-action", BELL_ANY); 340 options_set_number(so, "buffer-limit", 9); 341 options_set_string(so, "default-command", "%s", ""); 342 options_set_string(so, "default-path", "%s", ""); 343 options_set_string(so, "default-shell", "%s", getshell()); 344 options_set_string(so, "default-terminal", "screen"); 345 options_set_number(so, "destroy-unattached", 0); 346 options_set_number(so, "detach-on-destroy", 1); 347 options_set_number(so, "display-panes-active-colour", 1); 348 options_set_number(so, "display-panes-colour", 4); 349 options_set_number(so, "display-panes-time", 1000); 350 options_set_number(so, "display-time", 750); 351 options_set_number(so, "history-limit", 2000); 352 options_set_number(so, "lock-after-time", 0); 353 options_set_string(so, "lock-command", "lock -np"); 354 options_set_number(so, "lock-server", 1); 355 options_set_number(so, "message-attr", 0); 356 options_set_number(so, "message-bg", 3); 357 options_set_number(so, "message-fg", 0); 358 options_set_number(so, "message-limit", 20); 359 options_set_number(so, "mouse-select-pane", 0); 360 options_set_number(so, "pane-active-border-bg", 8); 361 options_set_number(so, "pane-active-border-fg", 2); 362 options_set_number(so, "pane-border-bg", 8); 363 options_set_number(so, "pane-border-fg", 8); 364 options_set_number(so, "repeat-time", 500); 365 options_set_number(so, "set-remain-on-exit", 0); 366 options_set_number(so, "set-titles", 0); 367 options_set_string(so, "set-titles-string", "#S:#I:#W - \"#T\""); 368 options_set_number(so, "status", 1); 369 options_set_number(so, "status-attr", 0); 370 options_set_number(so, "status-bg", 2); 371 options_set_number(so, "status-fg", 0); 372 options_set_number(so, "status-interval", 15); 373 options_set_number(so, "status-justify", 0); 374 options_set_number(so, "status-keys", MODEKEY_EMACS); 375 options_set_string(so, "status-left", "[#S]"); 376 options_set_number(so, "status-left-attr", 0); 377 options_set_number(so, "status-left-bg", 8); 378 options_set_number(so, "status-left-fg", 8); 379 options_set_number(so, "status-left-length", 10); 380 options_set_string(so, "status-right", "\"#22T\" %%H:%%M %%d-%%b-%%y"); 381 options_set_number(so, "status-right-attr", 0); 382 options_set_number(so, "status-right-bg", 8); 383 options_set_number(so, "status-right-fg", 8); 384 options_set_number(so, "status-right-length", 40); 385 options_set_string(so, "terminal-overrides", 386 "*88col*:colors=88,*256col*:colors=256"); 387 options_set_string(so, "update-environment", "DISPLAY " 388 "WINDOWID SSH_ASKPASS SSH_AUTH_SOCK SSH_AGENT_PID SSH_CONNECTION"); 389 options_set_number(so, "visual-activity", 0); 390 options_set_number(so, "visual-bell", 0); 391 options_set_number(so, "visual-content", 0); 392 393 keylist = xmalloc(sizeof *keylist); 394 ARRAY_INIT(keylist); 395 ARRAY_ADD(keylist, '\002'); 396 options_set_data(so, "prefix", keylist, xfree); 397 398 options_init(&global_w_options, NULL); 399 wo = &global_w_options; 400 options_set_number(wo, "aggressive-resize", 0); 401 options_set_number(wo, "alternate-screen", 1); 402 options_set_number(wo, "automatic-rename", 1); 403 options_set_number(wo, "clock-mode-colour", 4); 404 options_set_number(wo, "clock-mode-style", 1); 405 options_set_number(wo, "force-height", 0); 406 options_set_number(wo, "force-width", 0); 407 options_set_number(wo, "main-pane-height", 24); 408 options_set_number(wo, "main-pane-width", 81); 409 options_set_number(wo, "mode-attr", 0); 410 options_set_number(wo, "mode-bg", 3); 411 options_set_number(wo, "mode-fg", 0); 412 options_set_number(wo, "mode-keys", MODEKEY_EMACS); 413 options_set_number(wo, "mode-mouse", 0); 414 options_set_number(wo, "monitor-activity", 0); 415 options_set_string(wo, "monitor-content", "%s", ""); 416 options_set_number(wo, "window-status-attr", 0); 417 options_set_number(wo, "window-status-bg", 8); 418 options_set_number(wo, "window-status-current-attr", 0); 419 options_set_number(wo, "window-status-current-bg", 8); 420 options_set_number(wo, "window-status-current-fg", 8); 421 options_set_number(wo, "window-status-fg", 8); 422 options_set_number(wo, "window-status-alert-attr", GRID_ATTR_REVERSE); 423 options_set_number(wo, "window-status-alert-bg", 8); 424 options_set_number(wo, "window-status-alert-fg", 8); 425 options_set_string(wo, "window-status-format", "#I:#W#F"); 426 options_set_string(wo, "window-status-current-format", "#I:#W#F"); 427 options_set_string(wo, "word-separators", " -_@"); 428 options_set_number(wo, "xterm-keys", 0); 429 options_set_number(wo, "remain-on-exit", 0); 430 options_set_number(wo, "synchronize-panes", 0); 431 432 if (flags & IDENTIFY_UTF8) { 433 options_set_number(so, "status-utf8", 1); 434 options_set_number(wo, "utf8", 1); 435 } else { 436 options_set_number(so, "status-utf8", 0); 437 options_set_number(wo, "utf8", 0); 438 } 439 440 if (cfg_file == NULL) { 441 home = getenv("HOME"); 442 if (home == NULL || *home == '\0') { 443 pw = getpwuid(getuid()); 444 if (pw != NULL) 445 home = pw->pw_dir; 446 } 447 xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG); 448 if (access(cfg_file, R_OK) != 0 && errno == ENOENT) { 449 xfree(cfg_file); 450 cfg_file = NULL; 451 } 452 } 453 454 /* 455 * Figure out the socket path. If specified on the command-line with 456 * -S or -L, use it, otherwise try $TMUX or assume -L default. 457 */ 458 parse_env(&envdata); 459 if (path == NULL) { 460 /* No -L. Try $TMUX, or default. */ 461 if (label == NULL) { 462 path = envdata.path; 463 if (path == NULL) 464 label = xstrdup("default"); 465 } 466 467 /* -L or default set. */ 468 if (label != NULL) { 469 if ((path = makesockpath(label)) == NULL) { 470 log_warn("can't create socket"); 471 exit(1); 472 } 473 } 474 } 475 if (label != NULL) 476 xfree(label); 477 478 if (shellcmd != NULL) { 479 msg = MSG_SHELL; 480 buf = NULL; 481 len = 0; 482 } else { 483 cmddata.pid = envdata.pid; 484 cmddata.idx = envdata.idx; 485 486 /* Prepare command for server. */ 487 cmddata.argc = argc; 488 if (cmd_pack_argv( 489 argc, argv, cmddata.argv, sizeof cmddata.argv) != 0) { 490 log_warnx("command too long"); 491 exit(1); 492 } 493 494 msg = MSG_COMMAND; 495 buf = &cmddata; 496 len = sizeof cmddata; 497 } 498 499 if (shellcmd != NULL) 500 cmdflags |= CMD_STARTSERVER; 501 else if (argc == 0) /* new-session is the default */ 502 cmdflags |= CMD_STARTSERVER|CMD_SENDENVIRON|CMD_CANTNEST; 503 else { 504 /* 505 * It sucks parsing the command string twice (in client and 506 * later in server) but it is necessary to get the start server 507 * flag. 508 */ 509 if ((cmdlist = cmd_list_parse(argc, argv, &cause)) == NULL) { 510 log_warnx("%s", cause); 511 exit(1); 512 } 513 cmdflags &= ~CMD_STARTSERVER; 514 TAILQ_FOREACH(cmd, &cmdlist->list, qentry) { 515 if (cmd->entry->flags & CMD_STARTSERVER) 516 cmdflags |= CMD_STARTSERVER; 517 if (cmd->entry->flags & CMD_SENDENVIRON) 518 cmdflags |= CMD_SENDENVIRON; 519 if (cmd->entry->flags & CMD_CANTNEST) 520 cmdflags |= CMD_CANTNEST; 521 } 522 cmd_list_free(cmdlist); 523 } 524 525 /* 526 * Check if this could be a nested session, if the command can't nest: 527 * if the socket path matches $TMUX, this is probably the same server. 528 */ 529 if (shellcmd == NULL && envdata.path != NULL && 530 cmdflags & CMD_CANTNEST && 531 (path == envdata.path || strcmp(path, envdata.path) == 0)) { 532 log_warnx("sessions should be nested with care. " 533 "unset $TMUX to force."); 534 exit(1); 535 } 536 537 ev_base = event_init(); 538 set_signals(main_signal); 539 540 /* Initialise the client socket/start the server. */ 541 if ((main_ibuf = client_init(path, cmdflags, flags)) == NULL) 542 exit(1); 543 xfree(path); 544 545 imsg_compose(main_ibuf, msg, PROTOCOL_VERSION, -1, -1, buf, len); 546 547 events = EV_READ; 548 if (main_ibuf->w.queued > 0) 549 events |= EV_WRITE; 550 event_once(main_ibuf->fd, events, main_callback, shellcmd, NULL); 551 552 event_dispatch(); 553 554 clear_signals(0); 555 556 client_main(); /* doesn't return */ 557 } 558 559 /* ARGSUSED */ 560 void 561 main_signal(int sig, unused short events, unused void *data) 562 { 563 int status; 564 565 switch (sig) { 566 case SIGTERM: 567 exit(1); 568 case SIGCHLD: 569 waitpid(WAIT_ANY, &status, WNOHANG); 570 break; 571 } 572 } 573 574 /* ARGSUSED */ 575 void 576 main_callback(unused int fd, short events, void *data) 577 { 578 char *shellcmd = data; 579 580 if (events & EV_READ) 581 main_dispatch(shellcmd); 582 583 if (events & EV_WRITE) { 584 if (msgbuf_write(&main_ibuf->w) < 0) 585 fatalx("msgbuf_write failed"); 586 } 587 588 events = EV_READ; 589 if (main_ibuf->w.queued > 0) 590 events |= EV_WRITE; 591 event_once(main_ibuf->fd, events, main_callback, shellcmd, NULL); 592 } 593 594 void 595 main_dispatch(const char *shellcmd) 596 { 597 struct imsg imsg; 598 ssize_t n, datalen; 599 struct msg_shell_data shelldata; 600 struct msg_exit_data exitdata; 601 602 if ((n = imsg_read(main_ibuf)) == -1 || n == 0) 603 fatalx("imsg_read failed"); 604 605 for (;;) { 606 if ((n = imsg_get(main_ibuf, &imsg)) == -1) 607 fatalx("imsg_get failed"); 608 if (n == 0) 609 return; 610 datalen = imsg.hdr.len - IMSG_HEADER_SIZE; 611 612 switch (imsg.hdr.type) { 613 case MSG_EXIT: 614 case MSG_SHUTDOWN: 615 if (datalen != sizeof exitdata) { 616 if (datalen != 0) 617 fatalx("bad MSG_EXIT size"); 618 exit(0); 619 } 620 memcpy(&exitdata, imsg.data, sizeof exitdata); 621 exit(exitdata.retcode); 622 case MSG_READY: 623 if (datalen != 0) 624 fatalx("bad MSG_READY size"); 625 626 event_loopexit(NULL); /* move to client_main() */ 627 break; 628 case MSG_VERSION: 629 if (datalen != 0) 630 fatalx("bad MSG_VERSION size"); 631 632 log_warnx("protocol version mismatch (client %u, " 633 "server %u)", PROTOCOL_VERSION, imsg.hdr.peerid); 634 exit(1); 635 case MSG_SHELL: 636 if (datalen != sizeof shelldata) 637 fatalx("bad MSG_SHELL size"); 638 memcpy(&shelldata, imsg.data, sizeof shelldata); 639 shelldata.shell[(sizeof shelldata.shell) - 1] = '\0'; 640 641 clear_signals(0); 642 643 shell_exec(shelldata.shell, shellcmd); 644 default: 645 fatalx("unexpected message"); 646 } 647 648 imsg_free(&imsg); 649 } 650 } 651