tmux.c revision 1.61
1/* $OpenBSD: tmux.c,v 1.61 2009/11/26 21:37:13 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 35extern char *malloc_options; 36#endif 37 38char *cfg_file; 39struct options global_s_options; /* session options */ 40struct options global_w_options; /* window options */ 41struct environ global_environ; 42 43int debug_level; 44int be_quiet; 45time_t start_time; 46char *socket_path; 47int login_shell; 48 49__dead void usage(void); 50void fill_session(struct msg_command_data *); 51char *makesockpath(const char *); 52__dead void shell_exec(const char *, const char *); 53 54struct imsgbuf *main_ibuf; 55struct event main_ev_sigterm; 56int main_exitval; 57 58void main_set_signals(void); 59void main_clear_signals(void); 60void main_signal(int, short, unused void *); 61void main_callback(int, short, void *); 62void main_dispatch(const char *); 63 64__dead void 65usage(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 74void 75logfile(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 87const char * 88getshell(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 104int 105checkshell(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 114int 115areshell(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 131void 132fill_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 169char * 170makesockpath(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 198shell_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 218int 219main(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 *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, 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 be_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_s_options, NULL); 318 so = &global_s_options; 319 options_set_number(so, "base-index", 0); 320 options_set_number(so, "bell-action", BELL_ANY); 321 options_set_number(so, "buffer-limit", 9); 322 options_set_string(so, "default-command", "%s", ""); 323 options_set_string(so, "default-shell", "%s", getshell()); 324 options_set_string(so, "default-terminal", "screen"); 325 options_set_number(so, "display-panes-colour", 4); 326 options_set_number(so, "display-panes-time", 1000); 327 options_set_number(so, "display-time", 750); 328 options_set_number(so, "history-limit", 2000); 329 options_set_number(so, "lock-after-time", 0); 330 options_set_string(so, "lock-command", "lock -np"); 331 options_set_number(so, "lock-server", 1); 332 options_set_number(so, "message-attr", 0); 333 options_set_number(so, "message-bg", 3); 334 options_set_number(so, "message-fg", 0); 335 options_set_number(so, "message-limit", 20); 336 options_set_number(so, "mouse-select-pane", 0); 337 options_set_number(so, "repeat-time", 500); 338 options_set_number(so, "set-remain-on-exit", 0); 339 options_set_number(so, "set-titles", 0); 340 options_set_string(so, "set-titles-string", "#S:#I:#W - \"#T\""); 341 options_set_number(so, "status", 1); 342 options_set_number(so, "status-attr", 0); 343 options_set_number(so, "status-bg", 2); 344 options_set_number(so, "status-fg", 0); 345 options_set_number(so, "status-interval", 15); 346 options_set_number(so, "status-justify", 0); 347 options_set_number(so, "status-keys", MODEKEY_EMACS); 348 options_set_string(so, "status-left", "[#S]"); 349 options_set_number(so, "status-left-attr", 0); 350 options_set_number(so, "status-left-bg", 8); 351 options_set_number(so, "status-left-fg", 8); 352 options_set_number(so, "status-left-length", 10); 353 options_set_string(so, "status-right", "\"#22T\" %%H:%%M %%d-%%b-%%y"); 354 options_set_number(so, "status-right-attr", 0); 355 options_set_number(so, "status-right-bg", 8); 356 options_set_number(so, "status-right-fg", 8); 357 options_set_number(so, "status-right-length", 40); 358 options_set_string(so, "terminal-overrides", 359 "*88col*:colors=88,*256col*:colors=256"); 360 options_set_string(so, "update-environment", "DISPLAY " 361 "WINDOWID SSH_ASKPASS SSH_AUTH_SOCK SSH_AGENT_PID SSH_CONNECTION"); 362 options_set_number(so, "visual-activity", 0); 363 options_set_number(so, "visual-bell", 0); 364 options_set_number(so, "visual-content", 0); 365 366 keylist = xmalloc(sizeof *keylist); 367 ARRAY_INIT(keylist); 368 ARRAY_ADD(keylist, '\002'); 369 options_set_data(so, "prefix", keylist, xfree); 370 371 options_init(&global_w_options, NULL); 372 wo = &global_w_options; 373 options_set_number(wo, "aggressive-resize", 0); 374 options_set_number(wo, "automatic-rename", 1); 375 options_set_number(wo, "clock-mode-colour", 4); 376 options_set_number(wo, "clock-mode-style", 1); 377 options_set_number(wo, "force-height", 0); 378 options_set_number(wo, "force-width", 0); 379 options_set_number(wo, "main-pane-height", 24); 380 options_set_number(wo, "main-pane-width", 81); 381 options_set_number(wo, "mode-attr", 0); 382 options_set_number(wo, "mode-bg", 3); 383 options_set_number(wo, "mode-fg", 0); 384 options_set_number(wo, "mode-keys", MODEKEY_EMACS); 385 options_set_number(wo, "mode-mouse", 0); 386 options_set_number(wo, "monitor-activity", 0); 387 options_set_string(wo, "monitor-content", "%s", ""); 388 options_set_number(wo, "window-status-attr", 0); 389 options_set_number(wo, "window-status-bg", 8); 390 options_set_number(wo, "window-status-current-attr", 0); 391 options_set_number(wo, "window-status-current-bg", 8); 392 options_set_number(wo, "window-status-current-fg", 8); 393 options_set_number(wo, "window-status-fg", 8); 394 options_set_string(wo, "window-status-format", "#I:#W#F"); 395 options_set_string(wo, "window-status-current-format", "#I:#W#F"); 396 options_set_number(wo, "xterm-keys", 0); 397 options_set_number(wo, "remain-on-exit", 0); 398 options_set_number(wo, "synchronize-panes", 0); 399 400 if (flags & IDENTIFY_UTF8) { 401 options_set_number(so, "status-utf8", 1); 402 options_set_number(wo, "utf8", 1); 403 } else { 404 options_set_number(so, "status-utf8", 0); 405 options_set_number(wo, "utf8", 0); 406 } 407 408 if (getcwd(cwd, sizeof cwd) == NULL) { 409 pw = getpwuid(getuid()); 410 if (pw->pw_dir != NULL && *pw->pw_dir != '\0') 411 strlcpy(cwd, pw->pw_dir, sizeof cwd); 412 else 413 strlcpy(cwd, "/", sizeof cwd); 414 } 415 options_set_string(so, "default-path", "%s", cwd); 416 417 if (cfg_file == NULL) { 418 home = getenv("HOME"); 419 if (home == NULL || *home == '\0') { 420 pw = getpwuid(getuid()); 421 if (pw != NULL) 422 home = pw->pw_dir; 423 } 424 xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG); 425 if (access(cfg_file, R_OK) != 0) { 426 xfree(cfg_file); 427 cfg_file = NULL; 428 } 429 } else { 430 if (access(cfg_file, R_OK) != 0) { 431 log_warn("%s", cfg_file); 432 exit(1); 433 } 434 } 435 436 if (label == NULL) 437 label = xstrdup("default"); 438 if (path == NULL && (path = makesockpath(label)) == NULL) { 439 log_warn("can't create socket"); 440 exit(1); 441 } 442 xfree(label); 443 444 if (shellcmd != NULL) { 445 msg = MSG_SHELL; 446 buf = NULL; 447 len = 0; 448 } else { 449 fill_session(&cmddata); 450 451 cmddata.argc = argc; 452 if (cmd_pack_argv( 453 argc, argv, cmddata.argv, sizeof cmddata.argv) != 0) { 454 log_warnx("command too long"); 455 exit(1); 456 } 457 458 msg = MSG_COMMAND; 459 buf = &cmddata; 460 len = sizeof cmddata; 461 } 462 463 if (shellcmd != NULL) 464 cmdflags |= CMD_STARTSERVER; 465 else if (argc == 0) /* new-session is the default */ 466 cmdflags |= CMD_STARTSERVER|CMD_SENDENVIRON; 467 else { 468 /* 469 * It sucks parsing the command string twice (in client and 470 * later in server) but it is necessary to get the start server 471 * flag. 472 */ 473 if ((cmdlist = cmd_list_parse(argc, argv, &cause)) == NULL) { 474 log_warnx("%s", cause); 475 exit(1); 476 } 477 cmdflags &= ~CMD_STARTSERVER; 478 TAILQ_FOREACH(cmd, cmdlist, qentry) { 479 if (cmd->entry->flags & CMD_STARTSERVER) 480 cmdflags |= CMD_STARTSERVER; 481 if (cmd->entry->flags & CMD_SENDENVIRON) 482 cmdflags |= CMD_SENDENVIRON; 483 } 484 cmd_list_free(cmdlist); 485 } 486 487 if ((main_ibuf = client_init(path, cmdflags, flags)) == NULL) 488 exit(1); 489 xfree(path); 490 491 event_init(); 492 493 imsg_compose(main_ibuf, msg, PROTOCOL_VERSION, -1, -1, buf, len); 494 495 main_set_signals(); 496 497 events = EV_READ; 498 if (main_ibuf->w.queued > 0) 499 events |= EV_WRITE; 500 event_once(main_ibuf->fd, events, main_callback, shellcmd, NULL); 501 502 main_exitval = 0; 503 event_dispatch(); 504 505 main_clear_signals(); 506 507 client_main(); /* doesn't return */ 508} 509 510void 511main_set_signals(void) 512{ 513 struct sigaction sigact; 514 515 memset(&sigact, 0, sizeof sigact); 516 sigemptyset(&sigact.sa_mask); 517 sigact.sa_flags = SA_RESTART; 518 sigact.sa_handler = SIG_IGN; 519 if (sigaction(SIGINT, &sigact, NULL) != 0) 520 fatal("sigaction failed"); 521 if (sigaction(SIGPIPE, &sigact, NULL) != 0) 522 fatal("sigaction failed"); 523 if (sigaction(SIGUSR1, &sigact, NULL) != 0) 524 fatal("sigaction failed"); 525 if (sigaction(SIGUSR2, &sigact, NULL) != 0) 526 fatal("sigaction failed"); 527 if (sigaction(SIGTSTP, &sigact, NULL) != 0) 528 fatal("sigaction failed"); 529 530 signal_set(&main_ev_sigterm, SIGTERM, main_signal, NULL); 531 signal_add(&main_ev_sigterm, NULL); 532} 533 534void 535main_clear_signals(void) 536{ 537 struct sigaction sigact; 538 539 memset(&sigact, 0, sizeof sigact); 540 sigemptyset(&sigact.sa_mask); 541 sigact.sa_flags = SA_RESTART; 542 sigact.sa_handler = SIG_DFL; 543 if (sigaction(SIGINT, &sigact, NULL) != 0) 544 fatal("sigaction failed"); 545 if (sigaction(SIGPIPE, &sigact, NULL) != 0) 546 fatal("sigaction failed"); 547 if (sigaction(SIGUSR1, &sigact, NULL) != 0) 548 fatal("sigaction failed"); 549 if (sigaction(SIGUSR2, &sigact, NULL) != 0) 550 fatal("sigaction failed"); 551 if (sigaction(SIGTSTP, &sigact, NULL) != 0) 552 fatal("sigaction failed"); 553 554 event_del(&main_ev_sigterm); 555} 556 557/* ARGSUSED */ 558void 559main_signal(int sig, unused short events, unused void *data) 560{ 561 switch (sig) { 562 case SIGTERM: 563 exit(1); 564 } 565} 566 567/* ARGSUSED */ 568void 569main_callback(unused int fd, short events, void *data) 570{ 571 char *shellcmd = data; 572 573 if (events & EV_READ) 574 main_dispatch(shellcmd); 575 576 if (events & EV_WRITE) { 577 if (msgbuf_write(&main_ibuf->w) < 0) 578 fatalx("msgbuf_write failed"); 579 } 580 581 events = EV_READ; 582 if (main_ibuf->w.queued > 0) 583 events |= EV_WRITE; 584 event_once(main_ibuf->fd, events, main_callback, shellcmd, NULL); 585} 586 587void 588main_dispatch(const char *shellcmd) 589{ 590 struct imsg imsg; 591 ssize_t n, datalen; 592 struct msg_print_data printdata; 593 struct msg_shell_data shelldata; 594 595 if ((n = imsg_read(main_ibuf)) == -1 || n == 0) 596 fatalx("imsg_read failed"); 597 598 for (;;) { 599 if ((n = imsg_get(main_ibuf, &imsg)) == -1) 600 fatalx("imsg_get failed"); 601 if (n == 0) 602 return; 603 datalen = imsg.hdr.len - IMSG_HEADER_SIZE; 604 605 switch (imsg.hdr.type) { 606 case MSG_EXIT: 607 case MSG_SHUTDOWN: 608 if (datalen != 0) 609 fatalx("bad MSG_EXIT size"); 610 611 exit(main_exitval); 612 case MSG_ERROR: 613 case MSG_PRINT: 614 if (datalen != sizeof printdata) 615 fatalx("bad MSG_PRINT size"); 616 memcpy(&printdata, imsg.data, sizeof printdata); 617 printdata.msg[(sizeof printdata.msg) - 1] = '\0'; 618 619 log_info("%s", printdata.msg); 620 if (imsg.hdr.type == MSG_ERROR) 621 main_exitval = 1; 622 break; 623 case MSG_READY: 624 if (datalen != 0) 625 fatalx("bad MSG_READY size"); 626 627 event_loopexit(NULL); /* move to client_main() */ 628 break; 629 case MSG_VERSION: 630 if (datalen != 0) 631 fatalx("bad MSG_VERSION size"); 632 633 log_warnx("protocol version mismatch (client %u, " 634 "server %u)", PROTOCOL_VERSION, imsg.hdr.peerid); 635 exit(1); 636 case MSG_SHELL: 637 if (datalen != sizeof shelldata) 638 fatalx("bad MSG_SHELL size"); 639 memcpy(&shelldata, imsg.data, sizeof shelldata); 640 shelldata.shell[(sizeof shelldata.shell) - 1] = '\0'; 641 642 main_clear_signals(); 643 644 shell_exec(shelldata.shell, shellcmd); 645 default: 646 fatalx("unexpected message"); 647 } 648 649 imsg_free(&imsg); 650 } 651} 652