1 /* $OpenBSD: main.c,v 1.57 2015/09/10 22:48:58 nicm Exp $ */ 2 /* $OpenBSD: tty.c,v 1.10 2014/08/10 02:44:26 guenther Exp $ */ 3 /* $OpenBSD: io.c,v 1.26 2015/09/11 08:00:27 guenther Exp $ */ 4 /* $OpenBSD: table.c,v 1.16 2015/09/01 13:12:31 tedu Exp $ */ 5 6 /*- 7 * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 8 * 2011, 2012, 2013, 2014, 2015 9 * mirabilos <m (at) mirbsd.org> 10 * 11 * Provided that these terms and disclaimer and all copyright notices 12 * are retained or reproduced in an accompanying document, permission 13 * is granted to deal in this work without restriction, including un- 14 * limited rights to use, publicly perform, distribute, sell, modify, 15 * merge, give away, or sublicence. 16 * 17 * This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to 18 * the utmost extent permitted by applicable law, neither express nor 19 * implied; without malicious intent or gross negligence. In no event 20 * may a licensor, author or contributor be held liable for indirect, 21 * direct, other damage, loss, or other issues arising in any way out 22 * of dealing in the work, even if advised of the possibility of such 23 * damage or existence of a defect, except proven that it results out 24 * of said person's immediate fault when using the work as intended. 25 */ 26 27 #define EXTERN 28 #include "sh.h" 29 30 #if HAVE_LANGINFO_CODESET 31 #include <langinfo.h> 32 #endif 33 #if HAVE_SETLOCALE_CTYPE 34 #include <locale.h> 35 #endif 36 37 __RCSID("$MirOS: src/bin/mksh/main.c,v 1.306 2015/10/09 21:36:57 tg Exp $"); 38 39 extern char **environ; 40 41 #ifndef MKSHRC_PATH 42 #define MKSHRC_PATH "~/.mkshrc" 43 #endif 44 45 #ifndef MKSH_DEFAULT_TMPDIR 46 #define MKSH_DEFAULT_TMPDIR MKSH_UNIXROOT "/tmp" 47 #endif 48 49 static uint8_t isuc(const char *); 50 static int main_init(int, const char *[], Source **, struct block **); 51 void chvt_reinit(void); 52 static void reclaim(void); 53 static void remove_temps(struct temp *); 54 static mksh_uari_t rndsetup(void); 55 #ifdef SIGWINCH 56 static void x_sigwinch(int); 57 #endif 58 59 static const char initifs[] = "IFS= \t\n"; 60 61 static const char initsubs[] = 62 "${PS2=> } ${PS3=#? } ${PS4=+ } ${SECONDS=0} ${TMOUT=0} ${EPOCHREALTIME=}"; 63 64 static const char *initcoms[] = { 65 Ttypeset, "-r", initvsn, NULL, 66 Ttypeset, "-x", "HOME", "PATH", "SHELL", NULL, 67 Ttypeset, "-i10", "COLUMNS", "LINES", "SECONDS", "TMOUT", NULL, 68 Talias, 69 "integer=\\typeset -i", 70 "local=\\typeset", 71 /* not "alias -t --": hash -r needs to work */ 72 "hash=\\builtin alias -t", 73 "type=\\builtin whence -v", 74 "autoload=\\typeset -fu", 75 "functions=\\typeset -f", 76 "history=\\builtin fc -l", 77 "nameref=\\typeset -n", 78 "nohup=nohup ", 79 "r=\\builtin fc -e -", 80 "login=\\exec login", 81 NULL, 82 /* this is what AT&T ksh seems to track, with the addition of emacs */ 83 Talias, "-tU", 84 Tcat, "cc", "chmod", "cp", "date", "ed", "emacs", "grep", "ls", 85 "make", "mv", "pr", "rm", "sed", "sh", "vi", "who", NULL, 86 NULL 87 }; 88 89 static const char *restr_com[] = { 90 Ttypeset, "-r", "PATH", "ENV", "SHELL", NULL 91 }; 92 93 static bool initio_done; 94 95 /* top-level parsing and execution environment */ 96 static struct env env; 97 struct env *e = &env; 98 99 static mksh_uari_t 100 rndsetup(void) 101 { 102 register uint32_t h; 103 struct { 104 ALLOC_ITEM alloc_INT; 105 void *dataptr, *stkptr, *mallocptr; 106 #if defined(__GLIBC__) && (__GLIBC__ >= 2) 107 sigjmp_buf jbuf; 108 #endif 109 struct timeval tv; 110 } *bufptr; 111 char *cp; 112 113 cp = alloc(sizeof(*bufptr) - ALLOC_SIZE, APERM); 114 #ifdef DEBUG 115 /* clear the allocated space, for valgrind */ 116 memset(cp, 0, sizeof(*bufptr) - ALLOC_SIZE); 117 #endif 118 /* undo what alloc() did to the malloc result address */ 119 bufptr = (void *)(cp - ALLOC_SIZE); 120 /* PIE or something similar provides us with deltas here */ 121 bufptr->dataptr = &rndsetupstate; 122 /* ASLR in at least Windows, Linux, some BSDs */ 123 bufptr->stkptr = &bufptr; 124 /* randomised malloc in BSD (and possibly others) */ 125 bufptr->mallocptr = bufptr; 126 #if defined(__GLIBC__) && (__GLIBC__ >= 2) 127 /* glibc pointer guard */ 128 sigsetjmp(bufptr->jbuf, 1); 129 #endif 130 /* introduce variation (and yes, second arg MBZ for portability) */ 131 mksh_TIME(bufptr->tv); 132 133 h = chvt_rndsetup(bufptr, sizeof(*bufptr)); 134 135 afree(cp, APERM); 136 return ((mksh_uari_t)h); 137 } 138 139 void 140 chvt_reinit(void) 141 { 142 kshpid = procpid = getpid(); 143 ksheuid = geteuid(); 144 kshpgrp = getpgrp(); 145 kshppid = getppid(); 146 } 147 148 static const char *empty_argv[] = { 149 "mksh", NULL 150 }; 151 152 static uint8_t 153 isuc(const char *cx) { 154 char *cp, *x; 155 uint8_t rv = 0; 156 157 if (!cx || !*cx) 158 return (0); 159 160 /* uppercase a string duplicate */ 161 strdupx(x, cx, ATEMP); 162 cp = x; 163 while ((*cp = ksh_toupper(*cp))) 164 ++cp; 165 166 /* check for UTF-8 */ 167 if (strstr(x, "UTF-8") || strstr(x, "UTF8")) 168 rv = 1; 169 170 /* free copy and out */ 171 afree(x, ATEMP); 172 return (rv); 173 } 174 175 static int 176 main_init(int argc, const char *argv[], Source **sp, struct block **lp) 177 { 178 int argi, i; 179 Source *s = NULL; 180 struct block *l; 181 unsigned char restricted_shell, errexit, utf_flag; 182 char *cp; 183 const char *ccp, **wp; 184 struct tbl *vp; 185 struct stat s_stdin; 186 #if !defined(_PATH_DEFPATH) && defined(_CS_PATH) 187 ssize_t k; 188 #endif 189 190 #ifdef __OS2__ 191 for (i = 0; i < 3; ++i) 192 if (!isatty(i)) 193 setmode(i, O_BINARY); 194 #endif 195 196 /* do things like getpgrp() et al. */ 197 chvt_reinit(); 198 199 /* make sure argv[] is sane, for weird OSes */ 200 if (!*argv) { 201 argv = empty_argv; 202 argc = 1; 203 } 204 kshname = argv[0]; 205 206 /* initialise permanent Area */ 207 ainit(&aperm); 208 209 /* set up base environment */ 210 env.type = E_NONE; 211 ainit(&env.area); 212 /* set up global l->vars and l->funs */ 213 newblock(); 214 215 /* Do this first so output routines (eg, errorf, shellf) can work */ 216 initio(); 217 218 /* determine the basename (without '-' or path) of the executable */ 219 ccp = kshname; 220 goto begin_parse_kshname; 221 while ((i = ccp[argi++])) { 222 if (i == '/') { 223 ccp += argi; 224 begin_parse_kshname: 225 argi = 0; 226 if (*ccp == '-') 227 ++ccp; 228 } 229 } 230 if (!*ccp) 231 ccp = empty_argv[0]; 232 233 /* 234 * Turn on nohup by default. (AT&T ksh does not have a nohup 235 * option - it always sends the hup). 236 */ 237 Flag(FNOHUP) = 1; 238 239 /* 240 * Turn on brace expansion by default. AT&T kshs that have 241 * alternation always have it on. 242 */ 243 Flag(FBRACEEXPAND) = 1; 244 245 /* 246 * Turn on "set -x" inheritance by default. 247 */ 248 Flag(FXTRACEREC) = 1; 249 250 /* define built-in commands and see if we were called as one */ 251 ktinit(APERM, &builtins, 252 /* currently up to 54 builtins: 75% of 128 = 2^7 */ 253 7); 254 for (i = 0; mkshbuiltins[i].name != NULL; i++) 255 if (!strcmp(ccp, builtin(mkshbuiltins[i].name, 256 mkshbuiltins[i].func))) 257 Flag(FAS_BUILTIN) = 1; 258 259 if (!Flag(FAS_BUILTIN)) { 260 /* check for -T option early */ 261 argi = parse_args(argv, OF_FIRSTTIME, NULL); 262 if (argi < 0) 263 return (1); 264 265 #if defined(MKSH_BINSHPOSIX) || defined(MKSH_BINSHREDUCED) 266 /* are we called as -sh or /bin/sh or so? */ 267 if (!strcmp(ccp, "sh" MKSH_EXE_EXT)) { 268 /* either also turns off braceexpand */ 269 #ifdef MKSH_BINSHPOSIX 270 /* enable better POSIX conformance */ 271 change_flag(FPOSIX, OF_FIRSTTIME, true); 272 #endif 273 #ifdef MKSH_BINSHREDUCED 274 /* enable kludge/compat mode */ 275 change_flag(FSH, OF_FIRSTTIME, true); 276 #endif 277 } 278 #endif 279 } 280 281 initvar(); 282 283 initctypes(); 284 285 inittraps(); 286 287 coproc_init(); 288 289 /* set up variable and command dictionaries */ 290 ktinit(APERM, &taliases, 0); 291 ktinit(APERM, &aliases, 0); 292 #ifndef MKSH_NOPWNAM 293 ktinit(APERM, &homedirs, 0); 294 #endif 295 296 /* define shell keywords */ 297 initkeywords(); 298 299 init_histvec(); 300 301 /* initialise tty size before importing environment */ 302 change_winsz(); 303 304 #ifdef _PATH_DEFPATH 305 def_path = _PATH_DEFPATH; 306 #else 307 #ifdef _CS_PATH 308 if ((k = confstr(_CS_PATH, NULL, 0)) > 0 && 309 confstr(_CS_PATH, cp = alloc(k + 1, APERM), k + 1) == k + 1) 310 def_path = cp; 311 else 312 #endif 313 /* 314 * this is uniform across all OSes unless it 315 * breaks somewhere; don't try to optimise, 316 * e.g. add stuff for Interix or remove /usr 317 * for HURD, because e.g. Debian GNU/HURD is 318 * "keeping a regular /usr"; this is supposed 319 * to be a sane 'basic' default PATH 320 */ 321 def_path = MKSH_UNIXROOT "/bin" MKSH_PATHSEPS 322 MKSH_UNIXROOT "/usr/bin" MKSH_PATHSEPS 323 MKSH_UNIXROOT "/sbin" MKSH_PATHSEPS 324 MKSH_UNIXROOT "/usr/sbin"; 325 #endif 326 327 /* 328 * Set PATH to def_path (will set the path global variable). 329 * (import of environment below will probably change this setting). 330 */ 331 vp = global("PATH"); 332 /* setstr can't fail here */ 333 setstr(vp, def_path, KSH_RETURN_ERROR); 334 335 #ifndef MKSH_NO_CMDLINE_EDITING 336 /* 337 * Set edit mode to emacs by default, may be overridden 338 * by the environment or the user. Also, we want tab completion 339 * on in vi by default. 340 */ 341 change_flag(FEMACS, OF_SPECIAL, true); 342 #if !MKSH_S_NOVI 343 Flag(FVITABCOMPLETE) = 1; 344 #endif 345 #endif 346 347 /* import environment */ 348 if (environ != NULL) { 349 wp = (const char **)environ; 350 while (*wp != NULL) { 351 rndpush(*wp); 352 typeset(*wp, IMPORT | EXPORT, 0, 0, 0); 353 ++wp; 354 } 355 } 356 357 /* for security */ 358 typeset(initifs, 0, 0, 0, 0); 359 360 /* assign default shell variable values */ 361 substitute(initsubs, 0); 362 363 /* Figure out the current working directory and set $PWD */ 364 vp = global("PWD"); 365 cp = str_val(vp); 366 /* Try to use existing $PWD if it is valid */ 367 set_current_wd((mksh_abspath(cp) && test_eval(NULL, TO_FILEQ, cp, ".", 368 true)) ? cp : NULL); 369 if (current_wd[0]) 370 simplify_path(current_wd); 371 /* Only set pwd if we know where we are or if it had a bogus value */ 372 if (current_wd[0] || *cp) 373 /* setstr can't fail here */ 374 setstr(vp, current_wd, KSH_RETURN_ERROR); 375 376 for (wp = initcoms; *wp != NULL; wp++) { 377 shcomexec(wp); 378 while (*wp != NULL) 379 wp++; 380 } 381 setint_n(global("OPTIND"), 1, 10); 382 383 kshuid = getuid(); 384 kshgid = getgid(); 385 kshegid = getegid(); 386 387 safe_prompt = ksheuid ? "$ " : "# "; 388 vp = global("PS1"); 389 /* Set PS1 if unset or we are root and prompt doesn't contain a # */ 390 if (!(vp->flag & ISSET) || 391 (!ksheuid && !strchr(str_val(vp), '#'))) 392 /* setstr can't fail here */ 393 setstr(vp, safe_prompt, KSH_RETURN_ERROR); 394 setint_n((vp = global("BASHPID")), 0, 10); 395 vp->flag |= INT_U; 396 setint_n((vp = global("PGRP")), (mksh_uari_t)kshpgrp, 10); 397 vp->flag |= INT_U; 398 setint_n((vp = global("PPID")), (mksh_uari_t)kshppid, 10); 399 vp->flag |= INT_U; 400 setint_n((vp = global("USER_ID")), (mksh_uari_t)ksheuid, 10); 401 vp->flag |= INT_U; 402 setint_n((vp = global("KSHUID")), (mksh_uari_t)kshuid, 10); 403 vp->flag |= INT_U; 404 setint_n((vp = global("KSHEGID")), (mksh_uari_t)kshegid, 10); 405 vp->flag |= INT_U; 406 setint_n((vp = global("KSHGID")), (mksh_uari_t)kshgid, 10); 407 vp->flag |= INT_U; 408 setint_n((vp = global("RANDOM")), rndsetup(), 10); 409 vp->flag |= INT_U; 410 setint_n((vp_pipest = global("PIPESTATUS")), 0, 10); 411 412 /* Set this before parsing arguments */ 413 Flag(FPRIVILEGED) = (kshuid != ksheuid || kshgid != kshegid) ? 2 : 0; 414 415 /* this to note if monitor is set on command line (see below) */ 416 #ifndef MKSH_UNEMPLOYED 417 Flag(FMONITOR) = 127; 418 #endif 419 /* this to note if utf-8 mode is set on command line (see below) */ 420 UTFMODE = 2; 421 422 if (!Flag(FAS_BUILTIN)) { 423 argi = parse_args(argv, OF_CMDLINE, NULL); 424 if (argi < 0) 425 return (1); 426 } 427 428 /* process this later only, default to off (hysterical raisins) */ 429 utf_flag = UTFMODE; 430 UTFMODE = 0; 431 432 if (Flag(FAS_BUILTIN)) { 433 /* auto-detect from environment variables, always */ 434 utf_flag = 3; 435 } else if (Flag(FCOMMAND)) { 436 s = pushs(SSTRINGCMDLINE, ATEMP); 437 if (!(s->start = s->str = argv[argi++])) 438 errorf("%s %s", "-c", "requires an argument"); 439 while (*s->str) { 440 if (*s->str != ' ' && ctype(*s->str, C_QUOTE)) 441 break; 442 s->str++; 443 } 444 if (!*s->str) 445 s->flags |= SF_MAYEXEC; 446 s->str = s->start; 447 #ifdef MKSH_MIDNIGHTBSD01ASH_COMPAT 448 /* compatibility to MidnightBSD 0.1 /bin/sh (kludge) */ 449 if (Flag(FSH) && argv[argi] && !strcmp(argv[argi], "--")) 450 ++argi; 451 #endif 452 if (argv[argi]) 453 kshname = argv[argi++]; 454 } else if (argi < argc && !Flag(FSTDIN)) { 455 s = pushs(SFILE, ATEMP); 456 #ifdef __OS2__ 457 /* 458 * A bug in OS/2 extproc (like shebang) handling makes 459 * it not pass the full pathname of a script, so we need 460 * to search for it. This changes the behaviour of a 461 * simple "mksh foo", but can't be helped. 462 */ 463 s->file = search_path(argv[argi++], path, X_OK, NULL); 464 if (!s->file || !*s->file) 465 s->file = argv[argi - 1]; 466 #else 467 s->file = argv[argi++]; 468 #endif 469 s->u.shf = shf_open(s->file, O_RDONLY, 0, 470 SHF_MAPHI | SHF_CLEXEC); 471 if (s->u.shf == NULL) { 472 shl_stdout_ok = false; 473 warningf(true, "%s: %s", s->file, cstrerror(errno)); 474 /* mandated by SUSv4 */ 475 exstat = 127; 476 unwind(LERROR); 477 } 478 kshname = s->file; 479 } else { 480 Flag(FSTDIN) = 1; 481 s = pushs(SSTDIN, ATEMP); 482 s->file = "<stdin>"; 483 s->u.shf = shf_fdopen(0, SHF_RD | can_seek(0), 484 NULL); 485 if (isatty(0) && isatty(2)) { 486 Flag(FTALKING) = Flag(FTALKING_I) = 1; 487 /* The following only if isatty(0) */ 488 s->flags |= SF_TTY; 489 s->u.shf->flags |= SHF_INTERRUPT; 490 s->file = NULL; 491 } 492 } 493 494 /* this bizarreness is mandated by POSIX */ 495 if (fstat(0, &s_stdin) >= 0 && S_ISCHR(s_stdin.st_mode) && 496 Flag(FTALKING)) 497 reset_nonblock(0); 498 499 /* initialise job control */ 500 j_init(); 501 /* do this after j_init() which calls tty_init_state() */ 502 if (Flag(FTALKING)) { 503 if (utf_flag == 2) { 504 #ifndef MKSH_ASSUME_UTF8 505 /* auto-detect from locale or environment */ 506 utf_flag = 4; 507 #else /* this may not be an #elif */ 508 #if MKSH_ASSUME_UTF8 509 utf_flag = 1; 510 #else 511 /* always disable UTF-8 (for interactive) */ 512 utf_flag = 0; 513 #endif 514 #endif 515 } 516 #ifndef MKSH_NO_CMDLINE_EDITING 517 x_init(); 518 #endif 519 } 520 521 #ifdef SIGWINCH 522 sigtraps[SIGWINCH].flags |= TF_SHELL_USES; 523 setsig(&sigtraps[SIGWINCH], x_sigwinch, 524 SS_RESTORE_ORIG|SS_FORCE|SS_SHTRAP); 525 #endif 526 527 l = e->loc; 528 if (Flag(FAS_BUILTIN)) { 529 l->argc = argc; 530 l->argv = argv; 531 l->argv[0] = ccp; 532 } else { 533 l->argc = argc - argi; 534 /* 535 * allocate a new array because otherwise, when we modify 536 * it in-place, ps(1) output changes; the meaning of argc 537 * here is slightly different as it excludes kshname, and 538 * we add a trailing NULL sentinel as well 539 */ 540 l->argv = alloc2(l->argc + 2, sizeof(void *), APERM); 541 l->argv[0] = kshname; 542 memcpy(&l->argv[1], &argv[argi], l->argc * sizeof(void *)); 543 l->argv[l->argc + 1] = NULL; 544 getopts_reset(1); 545 } 546 547 /* divine the initial state of the utf8-mode Flag */ 548 ccp = null; 549 switch (utf_flag) { 550 551 /* auto-detect from locale or environment */ 552 case 4: 553 #if HAVE_SETLOCALE_CTYPE 554 ccp = setlocale(LC_CTYPE, ""); 555 #if HAVE_LANGINFO_CODESET 556 if (!isuc(ccp)) 557 ccp = nl_langinfo(CODESET); 558 #endif 559 if (!isuc(ccp)) 560 ccp = null; 561 /* FALLTHROUGH */ 562 #endif 563 564 /* auto-detect from environment */ 565 case 3: 566 /* these were imported from environ earlier */ 567 if (ccp == null) 568 ccp = str_val(global("LC_ALL")); 569 if (ccp == null) 570 ccp = str_val(global("LC_CTYPE")); 571 if (ccp == null) 572 ccp = str_val(global("LANG")); 573 UTFMODE = isuc(ccp); 574 break; 575 576 /* not set on command line, not FTALKING */ 577 case 2: 578 /* unknown values */ 579 default: 580 utf_flag = 0; 581 /* FALLTHROUGH */ 582 583 /* known values */ 584 case 1: 585 case 0: 586 UTFMODE = utf_flag; 587 break; 588 } 589 590 /* Disable during .profile/ENV reading */ 591 restricted_shell = Flag(FRESTRICTED); 592 Flag(FRESTRICTED) = 0; 593 errexit = Flag(FERREXIT); 594 Flag(FERREXIT) = 0; 595 596 /* 597 * Do this before profile/$ENV so that if it causes problems in them, 598 * user will know why things broke. 599 */ 600 if (!current_wd[0] && Flag(FTALKING)) 601 warningf(false, "can't determine current directory"); 602 603 if (Flag(FLOGIN)) 604 include(MKSH_SYSTEM_PROFILE, 0, NULL, true); 605 if (!Flag(FPRIVILEGED)) { 606 if (Flag(FLOGIN)) 607 include(substitute("$HOME/.profile", 0), 0, NULL, true); 608 if (Flag(FTALKING)) { 609 cp = substitute(substitute("${ENV:-" MKSHRC_PATH "}", 610 0), DOTILDE); 611 if (cp[0] != '\0') 612 include(cp, 0, NULL, true); 613 } 614 } else { 615 include(MKSH_SUID_PROFILE, 0, NULL, true); 616 /* turn off -p if not set explicitly */ 617 if (Flag(FPRIVILEGED) != 1) 618 change_flag(FPRIVILEGED, OF_INTERNAL, false); 619 } 620 621 if (restricted_shell) { 622 shcomexec(restr_com); 623 /* After typeset command... */ 624 Flag(FRESTRICTED) = 1; 625 } 626 Flag(FERREXIT) = errexit; 627 628 if (Flag(FTALKING) && s) 629 hist_init(s); 630 else 631 /* set after ENV */ 632 Flag(FTRACKALL) = 1; 633 634 alarm_init(); 635 636 *sp = s; 637 *lp = l; 638 return (0); 639 } 640 641 /* this indirection barrier reduces stack usage during normal operation */ 642 643 int 644 main(int argc, const char *argv[]) 645 { 646 int rv; 647 Source *s; 648 struct block *l; 649 650 if ((rv = main_init(argc, argv, &s, &l)) == 0) { 651 if (Flag(FAS_BUILTIN)) { 652 rv = shcomexec(l->argv); 653 } else { 654 shell(s, true); 655 /* NOTREACHED */ 656 } 657 } 658 return (rv); 659 } 660 661 int 662 include(const char *name, int argc, const char **argv, bool intr_ok) 663 { 664 Source *volatile s = NULL; 665 struct shf *shf; 666 const char **volatile old_argv; 667 volatile int old_argc; 668 int i; 669 670 shf = shf_open(name, O_RDONLY, 0, SHF_MAPHI | SHF_CLEXEC); 671 if (shf == NULL) 672 return (-1); 673 674 if (argv) { 675 old_argv = e->loc->argv; 676 old_argc = e->loc->argc; 677 } else { 678 old_argv = NULL; 679 old_argc = 0; 680 } 681 newenv(E_INCL); 682 if ((i = kshsetjmp(e->jbuf))) { 683 quitenv(s ? s->u.shf : NULL); 684 if (old_argv) { 685 e->loc->argv = old_argv; 686 e->loc->argc = old_argc; 687 } 688 switch (i) { 689 case LRETURN: 690 case LERROR: 691 /* see below */ 692 return (exstat & 0xFF); 693 case LINTR: 694 /* 695 * intr_ok is set if we are including .profile or $ENV. 696 * If user ^Cs out, we don't want to kill the shell... 697 */ 698 if (intr_ok && ((exstat & 0xFF) - 128) != SIGTERM) 699 return (1); 700 /* FALLTHROUGH */ 701 case LEXIT: 702 case LLEAVE: 703 case LSHELL: 704 unwind(i); 705 /* NOTREACHED */ 706 default: 707 internal_errorf("%s %d", "include", i); 708 /* NOTREACHED */ 709 } 710 } 711 if (argv) { 712 e->loc->argv = argv; 713 e->loc->argc = argc; 714 } 715 s = pushs(SFILE, ATEMP); 716 s->u.shf = shf; 717 strdupx(s->file, name, ATEMP); 718 i = shell(s, false); 719 quitenv(s->u.shf); 720 if (old_argv) { 721 e->loc->argv = old_argv; 722 e->loc->argc = old_argc; 723 } 724 /* & 0xff to ensure value not -1 */ 725 return (i & 0xFF); 726 } 727 728 /* spawn a command into a shell optionally keeping track of the line number */ 729 int 730 command(const char *comm, int line) 731 { 732 Source *s; 733 734 s = pushs(SSTRING, ATEMP); 735 s->start = s->str = comm; 736 s->line = line; 737 return (shell(s, false)); 738 } 739 740 /* 741 * run the commands from the input source, returning status. 742 */ 743 int 744 shell(Source * volatile s, volatile bool toplevel) 745 { 746 struct op *t; 747 volatile bool wastty = tobool(s->flags & SF_TTY); 748 volatile uint8_t attempts = 13; 749 volatile bool interactive = Flag(FTALKING) && toplevel; 750 volatile bool sfirst = true; 751 Source *volatile old_source = source; 752 int i; 753 754 newenv(E_PARSE); 755 if (interactive) 756 really_exit = false; 757 switch ((i = kshsetjmp(e->jbuf))) { 758 case 0: 759 break; 760 case LINTR: 761 /* we get here if SIGINT not caught or ignored */ 762 case LERROR: 763 case LSHELL: 764 if (interactive) { 765 if (i == LINTR) 766 shellf("\n"); 767 /* 768 * Reset any eof that was read as part of a 769 * multiline command. 770 */ 771 if (Flag(FIGNOREEOF) && s->type == SEOF && wastty) 772 s->type = SSTDIN; 773 /* 774 * Used by exit command to get back to 775 * top level shell. Kind of strange since 776 * interactive is set if we are reading from 777 * a tty, but to have stopped jobs, one only 778 * needs FMONITOR set (not FTALKING/SF_TTY)... 779 */ 780 /* toss any input we have so far */ 781 yyrecursive_pop(true); 782 s->start = s->str = null; 783 retrace_info = NULL; 784 herep = heres; 785 break; 786 } 787 /* FALLTHROUGH */ 788 case LEXIT: 789 case LLEAVE: 790 case LRETURN: 791 source = old_source; 792 quitenv(NULL); 793 /* keep on going */ 794 unwind(i); 795 /* NOTREACHED */ 796 default: 797 source = old_source; 798 quitenv(NULL); 799 internal_errorf("%s %d", "shell", i); 800 /* NOTREACHED */ 801 } 802 while (/* CONSTCOND */ 1) { 803 if (trap) 804 runtraps(0); 805 806 if (s->next == NULL) { 807 if (Flag(FVERBOSE)) 808 s->flags |= SF_ECHO; 809 else 810 s->flags &= ~SF_ECHO; 811 } 812 if (interactive) { 813 j_notify(); 814 set_prompt(PS1, s); 815 } 816 t = compile(s, sfirst); 817 if (interactive) 818 histsave(&s->line, NULL, HIST_FLUSH, true); 819 sfirst = false; 820 if (!t) 821 goto source_no_tree; 822 if (t->type == TEOF) { 823 if (wastty && Flag(FIGNOREEOF) && --attempts > 0) { 824 shellf("Use 'exit' to leave mksh\n"); 825 s->type = SSTDIN; 826 } else if (wastty && !really_exit && 827 j_stopped_running()) { 828 really_exit = true; 829 s->type = SSTDIN; 830 } else { 831 /* 832 * this for POSIX which says EXIT traps 833 * shall be taken in the environment 834 * immediately after the last command 835 * executed. 836 */ 837 if (toplevel) 838 unwind(LEXIT); 839 break; 840 } 841 } else if ((s->flags & SF_MAYEXEC) && t->type == TCOM) 842 t->u.evalflags |= DOTCOMEXEC; 843 if (!Flag(FNOEXEC) || (s->flags & SF_TTY)) 844 exstat = execute(t, 0, NULL) & 0xFF; 845 846 if (t->type != TEOF && interactive && really_exit) 847 really_exit = false; 848 849 source_no_tree: 850 reclaim(); 851 } 852 quitenv(NULL); 853 source = old_source; 854 return (exstat & 0xFF); 855 } 856 857 /* return to closest error handler or shell(), exit if none found */ 858 /* note: i MUST NOT be 0 */ 859 void 860 unwind(int i) 861 { 862 /* 863 * This is a kludge. We need to restore everything that was 864 * changed in the new environment, see cid 1005090337C7A669439 865 * and 10050903386452ACBF1, but fail to even save things most of 866 * the time. funcs.c:c_eval() changes FERREXIT temporarily to 0, 867 * which needs to be restored thus (related to Debian #696823). 868 * We did not save the shell flags, so we use a special or'd 869 * value here... this is mostly to clean up behind *other* 870 * callers of unwind(LERROR) here; exec.c has the regular case. 871 */ 872 if (Flag(FERREXIT) & 0x80) { 873 /* GNU bash does not run this trapsig */ 874 trapsig(ksh_SIGERR); 875 Flag(FERREXIT) &= ~0x80; 876 } 877 878 /* ordering for EXIT vs ERR is a bit odd (this is what AT&T ksh does) */ 879 if (i == LEXIT || ((i == LERROR || i == LINTR) && 880 sigtraps[ksh_SIGEXIT].trap && 881 (!Flag(FTALKING) || Flag(FERREXIT)))) { 882 ++trap_nested; 883 runtrap(&sigtraps[ksh_SIGEXIT], trap_nested == 1); 884 --trap_nested; 885 i = LLEAVE; 886 } else if (Flag(FERREXIT) == 1 && (i == LERROR || i == LINTR)) { 887 ++trap_nested; 888 runtrap(&sigtraps[ksh_SIGERR], trap_nested == 1); 889 --trap_nested; 890 i = LLEAVE; 891 } 892 893 while (/* CONSTCOND */ 1) { 894 switch (e->type) { 895 case E_PARSE: 896 case E_FUNC: 897 case E_INCL: 898 case E_LOOP: 899 case E_ERRH: 900 kshlongjmp(e->jbuf, i); 901 /* NOTREACHED */ 902 case E_NONE: 903 if (i == LINTR) 904 e->flags |= EF_FAKE_SIGDIE; 905 /* FALLTHROUGH */ 906 default: 907 quitenv(NULL); 908 /* 909 * quitenv() may have reclaimed the memory 910 * used by source which will end badly when 911 * we jump to a function that expects it to 912 * be valid 913 */ 914 source = NULL; 915 } 916 } 917 } 918 919 void 920 newenv(int type) 921 { 922 struct env *ep; 923 char *cp; 924 925 /* 926 * struct env includes ALLOC_ITEM for alignment constraints 927 * so first get the actually used memory, then assign it 928 */ 929 cp = alloc(sizeof(struct env) - ALLOC_SIZE, ATEMP); 930 /* undo what alloc() did to the malloc result address */ 931 ep = (void *)(cp - ALLOC_SIZE); 932 /* initialise public members of struct env (not the ALLOC_ITEM) */ 933 ainit(&ep->area); 934 ep->oenv = e; 935 ep->loc = e->loc; 936 ep->savefd = NULL; 937 ep->temps = NULL; 938 ep->yyrecursive_statep = NULL; 939 ep->type = type; 940 ep->flags = 0; 941 /* jump buffer is invalid because flags == 0 */ 942 e = ep; 943 } 944 945 void 946 quitenv(struct shf *shf) 947 { 948 struct env *ep = e; 949 char *cp; 950 int fd; 951 952 yyrecursive_pop(true); 953 while (ep->oenv && ep->oenv->loc != ep->loc) 954 popblock(); 955 if (ep->savefd != NULL) { 956 for (fd = 0; fd < NUFILE; fd++) 957 /* if ep->savefd[fd] < 0, means fd was closed */ 958 if (ep->savefd[fd]) 959 restfd(fd, ep->savefd[fd]); 960 if (ep->savefd[2]) 961 /* Clear any write errors */ 962 shf_reopen(2, SHF_WR, shl_out); 963 } 964 /* 965 * Bottom of the stack. 966 * Either main shell is exiting or cleanup_parents_env() was called. 967 */ 968 if (ep->oenv == NULL) { 969 #ifdef DEBUG_LEAKS 970 int i; 971 #endif 972 973 if (ep->type == E_NONE) { 974 /* Main shell exiting? */ 975 #if HAVE_PERSISTENT_HISTORY 976 if (Flag(FTALKING)) 977 hist_finish(); 978 #endif 979 j_exit(); 980 if (ep->flags & EF_FAKE_SIGDIE) { 981 int sig = (exstat & 0xFF) - 128; 982 983 /* 984 * ham up our death a bit (AT&T ksh 985 * only seems to do this for SIGTERM) 986 * Don't do it for SIGQUIT, since we'd 987 * dump a core.. 988 */ 989 if ((sig == SIGINT || sig == SIGTERM) && 990 (kshpgrp == kshpid)) { 991 setsig(&sigtraps[sig], SIG_DFL, 992 SS_RESTORE_CURR | SS_FORCE); 993 kill(0, sig); 994 } 995 } 996 } 997 if (shf) 998 shf_close(shf); 999 reclaim(); 1000 #ifdef DEBUG_LEAKS 1001 #ifndef MKSH_NO_CMDLINE_EDITING 1002 x_done(); 1003 #endif 1004 #ifndef MKSH_NOPROSPECTOFWORK 1005 /* block at least SIGCHLD during/after afreeall */ 1006 sigprocmask(SIG_BLOCK, &sm_sigchld, NULL); 1007 #endif 1008 afreeall(APERM); 1009 for (fd = 3; fd < NUFILE; fd++) 1010 if ((i = fcntl(fd, F_GETFD, 0)) != -1 && 1011 (i & FD_CLOEXEC)) 1012 close(fd); 1013 close(2); 1014 close(1); 1015 close(0); 1016 #endif 1017 exit(exstat & 0xFF); 1018 } 1019 if (shf) 1020 shf_close(shf); 1021 reclaim(); 1022 1023 e = e->oenv; 1024 1025 /* free the struct env - tricky due to the ALLOC_ITEM inside */ 1026 cp = (void *)ep; 1027 afree(cp + ALLOC_SIZE, ATEMP); 1028 } 1029 1030 /* Called after a fork to cleanup stuff left over from parents environment */ 1031 void 1032 cleanup_parents_env(void) 1033 { 1034 struct env *ep; 1035 int fd; 1036 1037 /* 1038 * Don't clean up temporary files - parent will probably need them. 1039 * Also, can't easily reclaim memory since variables, etc. could be 1040 * anywhere. 1041 */ 1042 1043 /* close all file descriptors hiding in savefd */ 1044 for (ep = e; ep; ep = ep->oenv) { 1045 if (ep->savefd) { 1046 for (fd = 0; fd < NUFILE; fd++) 1047 if (ep->savefd[fd] > 0) 1048 close(ep->savefd[fd]); 1049 afree(ep->savefd, &ep->area); 1050 ep->savefd = NULL; 1051 } 1052 #ifdef DEBUG_LEAKS 1053 if (ep->type != E_NONE) 1054 ep->type = E_GONE; 1055 #endif 1056 } 1057 #ifndef DEBUG_LEAKS 1058 e->oenv = NULL; 1059 #endif 1060 } 1061 1062 /* Called just before an execve cleanup stuff temporary files */ 1063 void 1064 cleanup_proc_env(void) 1065 { 1066 struct env *ep; 1067 1068 for (ep = e; ep; ep = ep->oenv) 1069 remove_temps(ep->temps); 1070 } 1071 1072 /* remove temp files and free ATEMP Area */ 1073 static void 1074 reclaim(void) 1075 { 1076 struct block *l; 1077 1078 while ((l = e->loc) && (!e->oenv || e->oenv->loc != l)) { 1079 e->loc = l->next; 1080 afreeall(&l->area); 1081 } 1082 1083 remove_temps(e->temps); 1084 e->temps = NULL; 1085 afreeall(&e->area); 1086 } 1087 1088 static void 1089 remove_temps(struct temp *tp) 1090 { 1091 for (; tp != NULL; tp = tp->next) 1092 if (tp->pid == procpid) 1093 unlink(tp->tffn); 1094 } 1095 1096 /* 1097 * Initialise tty_fd. Used for tracking the size of the terminal, 1098 * saving/resetting tty modes upon forground job completion, and 1099 * for setting up the tty process group. Return values: 1100 * 0 = got controlling tty 1101 * 1 = got terminal but no controlling tty 1102 * 2 = cannot find a terminal 1103 * 3 = cannot dup fd 1104 * 4 = cannot make fd close-on-exec 1105 * An existing tty_fd is cached if no "better" one could be found, 1106 * i.e. if tty_devtty was already set or the new would not set it. 1107 */ 1108 int 1109 tty_init_fd(void) 1110 { 1111 int fd, rv, eno = 0; 1112 bool do_close = false, is_devtty = true; 1113 1114 if (tty_devtty) { 1115 /* already got a tty which is /dev/tty */ 1116 return (0); 1117 } 1118 1119 #ifdef _UWIN 1120 /*XXX imake style */ 1121 if (isatty(3)) { 1122 /* fd 3 on UWIN _is_ /dev/tty (or our controlling tty) */ 1123 fd = 3; 1124 goto got_fd; 1125 } 1126 #endif 1127 if ((fd = open("/dev/tty", O_RDWR, 0)) >= 0) { 1128 do_close = true; 1129 goto got_fd; 1130 } 1131 eno = errno; 1132 1133 if (tty_fd >= 0) { 1134 /* already got a non-devtty one */ 1135 rv = 1; 1136 goto out; 1137 } 1138 is_devtty = false; 1139 1140 if (isatty((fd = 0)) || isatty((fd = 2))) 1141 goto got_fd; 1142 /* cannot find one */ 1143 rv = 2; 1144 /* assert: do_close == false */ 1145 goto out; 1146 1147 got_fd: 1148 if ((rv = fcntl(fd, F_DUPFD, FDBASE)) < 0) { 1149 eno = errno; 1150 rv = 3; 1151 goto out; 1152 } 1153 if (fcntl(rv, F_SETFD, FD_CLOEXEC) < 0) { 1154 eno = errno; 1155 close(rv); 1156 rv = 4; 1157 goto out; 1158 } 1159 tty_fd = rv; 1160 tty_devtty = is_devtty; 1161 rv = eno = 0; 1162 out: 1163 if (do_close) 1164 close(fd); 1165 errno = eno; 1166 return (rv); 1167 } 1168 1169 /* A shell error occurred (eg, syntax error, etc.) */ 1170 1171 #define VWARNINGF_ERRORPREFIX 1 1172 #define VWARNINGF_FILELINE 2 1173 #define VWARNINGF_BUILTIN 4 1174 #define VWARNINGF_INTERNAL 8 1175 1176 static void vwarningf(unsigned int, const char *, va_list) 1177 MKSH_A_FORMAT(__printf__, 2, 0); 1178 1179 static void 1180 vwarningf(unsigned int flags, const char *fmt, va_list ap) 1181 { 1182 if (fmt) { 1183 if (flags & VWARNINGF_INTERNAL) 1184 shf_fprintf(shl_out, "internal error: "); 1185 if (flags & VWARNINGF_ERRORPREFIX) 1186 error_prefix(tobool(flags & VWARNINGF_FILELINE)); 1187 if ((flags & VWARNINGF_BUILTIN) && 1188 /* not set when main() calls parse_args() */ 1189 builtin_argv0 && builtin_argv0 != kshname) 1190 shf_fprintf(shl_out, "%s: ", builtin_argv0); 1191 shf_vfprintf(shl_out, fmt, ap); 1192 shf_putchar('\n', shl_out); 1193 } 1194 shf_flush(shl_out); 1195 } 1196 1197 void 1198 errorfx(int rc, const char *fmt, ...) 1199 { 1200 va_list va; 1201 1202 exstat = rc; 1203 1204 /* debugging: note that stdout not valid */ 1205 shl_stdout_ok = false; 1206 1207 va_start(va, fmt); 1208 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va); 1209 va_end(va); 1210 unwind(LERROR); 1211 } 1212 1213 void 1214 errorf(const char *fmt, ...) 1215 { 1216 va_list va; 1217 1218 exstat = 1; 1219 1220 /* debugging: note that stdout not valid */ 1221 shl_stdout_ok = false; 1222 1223 va_start(va, fmt); 1224 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va); 1225 va_end(va); 1226 unwind(LERROR); 1227 } 1228 1229 /* like errorf(), but no unwind is done */ 1230 void 1231 warningf(bool fileline, const char *fmt, ...) 1232 { 1233 va_list va; 1234 1235 va_start(va, fmt); 1236 vwarningf(VWARNINGF_ERRORPREFIX | (fileline ? VWARNINGF_FILELINE : 0), 1237 fmt, va); 1238 va_end(va); 1239 } 1240 1241 /* 1242 * Used by built-in utilities to prefix shell and utility name to message 1243 * (also unwinds environments for special builtins). 1244 */ 1245 void 1246 bi_errorf(const char *fmt, ...) 1247 { 1248 va_list va; 1249 1250 /* debugging: note that stdout not valid */ 1251 shl_stdout_ok = false; 1252 1253 exstat = 1; 1254 1255 va_start(va, fmt); 1256 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE | 1257 VWARNINGF_BUILTIN, fmt, va); 1258 va_end(va); 1259 1260 /* 1261 * POSIX special builtins and ksh special builtins cause 1262 * non-interactive shells to exit. XXX may not want LERROR here 1263 */ 1264 if (builtin_spec) { 1265 builtin_argv0 = NULL; 1266 unwind(LERROR); 1267 } 1268 } 1269 1270 /* Called when something that shouldn't happen does */ 1271 void 1272 internal_errorf(const char *fmt, ...) 1273 { 1274 va_list va; 1275 1276 va_start(va, fmt); 1277 vwarningf(VWARNINGF_INTERNAL, fmt, va); 1278 va_end(va); 1279 unwind(LERROR); 1280 } 1281 1282 void 1283 internal_warningf(const char *fmt, ...) 1284 { 1285 va_list va; 1286 1287 va_start(va, fmt); 1288 vwarningf(VWARNINGF_INTERNAL, fmt, va); 1289 va_end(va); 1290 } 1291 1292 /* used by error reporting functions to print "ksh: .kshrc[25]: " */ 1293 void 1294 error_prefix(bool fileline) 1295 { 1296 /* Avoid foo: foo[2]: ... */ 1297 if (!fileline || !source || !source->file || 1298 strcmp(source->file, kshname) != 0) 1299 shf_fprintf(shl_out, "%s: ", kshname + (*kshname == '-')); 1300 if (fileline && source && source->file != NULL) { 1301 shf_fprintf(shl_out, "%s[%lu]: ", source->file, 1302 (unsigned long)(source->errline ? 1303 source->errline : source->line)); 1304 source->errline = 0; 1305 } 1306 } 1307 1308 /* printf to shl_out (stderr) with flush */ 1309 void 1310 shellf(const char *fmt, ...) 1311 { 1312 va_list va; 1313 1314 if (!initio_done) 1315 /* shl_out may not be set up yet... */ 1316 return; 1317 va_start(va, fmt); 1318 shf_vfprintf(shl_out, fmt, va); 1319 va_end(va); 1320 shf_flush(shl_out); 1321 } 1322 1323 /* printf to shl_stdout (stdout) */ 1324 void 1325 shprintf(const char *fmt, ...) 1326 { 1327 va_list va; 1328 1329 if (!shl_stdout_ok) 1330 internal_errorf("shl_stdout not valid"); 1331 va_start(va, fmt); 1332 shf_vfprintf(shl_stdout, fmt, va); 1333 va_end(va); 1334 } 1335 1336 /* test if we can seek backwards fd (returns 0 or SHF_UNBUF) */ 1337 int 1338 can_seek(int fd) 1339 { 1340 struct stat statb; 1341 1342 return (fstat(fd, &statb) == 0 && !S_ISREG(statb.st_mode) ? 1343 SHF_UNBUF : 0); 1344 } 1345 1346 #ifdef DF 1347 int shl_dbg_fd; 1348 #define NSHF_IOB 4 1349 #else 1350 #define NSHF_IOB 3 1351 #endif 1352 struct shf shf_iob[NSHF_IOB]; 1353 1354 void 1355 initio(void) 1356 { 1357 #ifdef DF 1358 const char *lfp; 1359 #endif 1360 1361 /* force buffer allocation */ 1362 shf_fdopen(1, SHF_WR, shl_stdout); 1363 shf_fdopen(2, SHF_WR, shl_out); 1364 shf_fdopen(2, SHF_WR, shl_xtrace); 1365 #ifdef DF 1366 if ((lfp = getenv("SDMKSH_PATH")) == NULL) { 1367 if ((lfp = getenv("HOME")) == NULL || !mksh_abspath(lfp)) 1368 errorf("cannot get home directory"); 1369 lfp = shf_smprintf("%s/mksh-dbg.txt", lfp); 1370 } 1371 1372 if ((shl_dbg_fd = open(lfp, O_WRONLY | O_APPEND | O_CREAT, 0600)) < 0) 1373 errorf("cannot open debug output file %s", lfp); 1374 if (shl_dbg_fd < FDBASE) { 1375 int nfd; 1376 1377 nfd = fcntl(shl_dbg_fd, F_DUPFD, FDBASE); 1378 close(shl_dbg_fd); 1379 if ((shl_dbg_fd = nfd) == -1) 1380 errorf("cannot dup debug output file"); 1381 } 1382 fcntl(shl_dbg_fd, F_SETFD, FD_CLOEXEC); 1383 shf_fdopen(shl_dbg_fd, SHF_WR, shl_dbg); 1384 DF("=== open ==="); 1385 #endif 1386 initio_done = true; 1387 } 1388 1389 /* A dup2() with error checking */ 1390 int 1391 ksh_dup2(int ofd, int nfd, bool errok) 1392 { 1393 int rv; 1394 1395 if (((rv = dup2(ofd, nfd)) < 0) && !errok && (errno != EBADF)) 1396 errorf("too many files open in shell"); 1397 1398 #ifdef __ultrix 1399 /*XXX imake style */ 1400 if (rv >= 0) 1401 fcntl(nfd, F_SETFD, 0); 1402 #endif 1403 1404 return (rv); 1405 } 1406 1407 /* 1408 * Move fd from user space (0 <= fd < 10) to shell space (fd >= 10), 1409 * set close-on-exec flag. See FDBASE in sh.h, maybe 24 not 10 here. 1410 */ 1411 short 1412 savefd(int fd) 1413 { 1414 int nfd = fd; 1415 1416 if (fd < FDBASE && (nfd = fcntl(fd, F_DUPFD, FDBASE)) < 0 && 1417 (errno == EBADF || errno == EPERM)) 1418 return (-1); 1419 if (nfd < 0 || nfd > SHRT_MAX) 1420 errorf("too many files open in shell"); 1421 fcntl(nfd, F_SETFD, FD_CLOEXEC); 1422 return ((short)nfd); 1423 } 1424 1425 void 1426 restfd(int fd, int ofd) 1427 { 1428 if (fd == 2) 1429 shf_flush(&shf_iob[/* fd */ 2]); 1430 if (ofd < 0) 1431 /* original fd closed */ 1432 close(fd); 1433 else if (fd != ofd) { 1434 /*XXX: what to do if this dup fails? */ 1435 ksh_dup2(ofd, fd, true); 1436 close(ofd); 1437 } 1438 } 1439 1440 void 1441 openpipe(int *pv) 1442 { 1443 int lpv[2]; 1444 1445 if (pipe(lpv) < 0) 1446 errorf("can't create pipe - try again"); 1447 pv[0] = savefd(lpv[0]); 1448 if (pv[0] != lpv[0]) 1449 close(lpv[0]); 1450 pv[1] = savefd(lpv[1]); 1451 if (pv[1] != lpv[1]) 1452 close(lpv[1]); 1453 } 1454 1455 void 1456 closepipe(int *pv) 1457 { 1458 close(pv[0]); 1459 close(pv[1]); 1460 } 1461 1462 /* 1463 * Called by iosetup() (deals with 2>&4, etc.), c_read, c_print to turn 1464 * a string (the X in 2>&X, read -uX, print -uX) into a file descriptor. 1465 */ 1466 int 1467 check_fd(const char *name, int mode, const char **emsgp) 1468 { 1469 int fd = 0, fl; 1470 1471 if (name[0] == 'p' && !name[1]) 1472 return (coproc_getfd(mode, emsgp)); 1473 while (ksh_isdigit(*name)) { 1474 fd = fd * 10 + ksh_numdig(*name); 1475 if (fd >= FDBASE) { 1476 if (emsgp) 1477 *emsgp = "file descriptor too large"; 1478 return (-1); 1479 } 1480 ++name; 1481 } 1482 if (*name) { 1483 if (emsgp) 1484 *emsgp = "illegal file descriptor name"; 1485 return (-1); 1486 } 1487 if ((fl = fcntl(fd, F_GETFL, 0)) < 0) { 1488 if (emsgp) 1489 *emsgp = "bad file descriptor"; 1490 return (-1); 1491 } 1492 fl &= O_ACCMODE; 1493 /* 1494 * X_OK is a kludge to disable this check for dups (x<&1): 1495 * historical shells never did this check (XXX don't know what 1496 * POSIX has to say). 1497 */ 1498 if (!(mode & X_OK) && fl != O_RDWR && ( 1499 ((mode & R_OK) && fl != O_RDONLY) || 1500 ((mode & W_OK) && fl != O_WRONLY))) { 1501 if (emsgp) 1502 *emsgp = (fl == O_WRONLY) ? 1503 "fd not open for reading" : 1504 "fd not open for writing"; 1505 return (-1); 1506 } 1507 return (fd); 1508 } 1509 1510 /* Called once from main */ 1511 void 1512 coproc_init(void) 1513 { 1514 coproc.read = coproc.readw = coproc.write = -1; 1515 coproc.njobs = 0; 1516 coproc.id = 0; 1517 } 1518 1519 /* Called by c_read() when eof is read - close fd if it is the co-process fd */ 1520 void 1521 coproc_read_close(int fd) 1522 { 1523 if (coproc.read >= 0 && fd == coproc.read) { 1524 coproc_readw_close(fd); 1525 close(coproc.read); 1526 coproc.read = -1; 1527 } 1528 } 1529 1530 /* 1531 * Called by c_read() and by iosetup() to close the other side of the 1532 * read pipe, so reads will actually terminate. 1533 */ 1534 void 1535 coproc_readw_close(int fd) 1536 { 1537 if (coproc.readw >= 0 && coproc.read >= 0 && fd == coproc.read) { 1538 close(coproc.readw); 1539 coproc.readw = -1; 1540 } 1541 } 1542 1543 /* 1544 * Called by c_print when a write to a fd fails with EPIPE and by iosetup 1545 * when co-process input is dup'd 1546 */ 1547 void 1548 coproc_write_close(int fd) 1549 { 1550 if (coproc.write >= 0 && fd == coproc.write) { 1551 close(coproc.write); 1552 coproc.write = -1; 1553 } 1554 } 1555 1556 /* 1557 * Called to check for existence of/value of the co-process file descriptor. 1558 * (Used by check_fd() and by c_read/c_print to deal with -p option). 1559 */ 1560 int 1561 coproc_getfd(int mode, const char **emsgp) 1562 { 1563 int fd = (mode & R_OK) ? coproc.read : coproc.write; 1564 1565 if (fd >= 0) 1566 return (fd); 1567 if (emsgp) 1568 *emsgp = "no coprocess"; 1569 return (-1); 1570 } 1571 1572 /* 1573 * called to close file descriptors related to the coprocess (if any) 1574 * Should be called with SIGCHLD blocked. 1575 */ 1576 void 1577 coproc_cleanup(int reuse) 1578 { 1579 /* This to allow co-processes to share output pipe */ 1580 if (!reuse || coproc.readw < 0 || coproc.read < 0) { 1581 if (coproc.read >= 0) { 1582 close(coproc.read); 1583 coproc.read = -1; 1584 } 1585 if (coproc.readw >= 0) { 1586 close(coproc.readw); 1587 coproc.readw = -1; 1588 } 1589 } 1590 if (coproc.write >= 0) { 1591 close(coproc.write); 1592 coproc.write = -1; 1593 } 1594 } 1595 1596 struct temp * 1597 maketemp(Area *ap, Temp_type type, struct temp **tlist) 1598 { 1599 char *cp; 1600 size_t len; 1601 int i, j; 1602 struct temp *tp; 1603 const char *dir; 1604 struct stat sb; 1605 1606 dir = tmpdir ? tmpdir : MKSH_DEFAULT_TMPDIR; 1607 /* add "/shXXXXXX.tmp" plus NUL */ 1608 len = strlen(dir); 1609 checkoktoadd(len, offsetof(struct temp, tffn[0]) + 14); 1610 tp = alloc(offsetof(struct temp, tffn[0]) + 14 + len, ap); 1611 1612 tp->shf = NULL; 1613 tp->pid = procpid; 1614 tp->type = type; 1615 1616 if (stat(dir, &sb) || !S_ISDIR(sb.st_mode)) { 1617 tp->tffn[0] = '\0'; 1618 goto maketemp_out; 1619 } 1620 1621 cp = (void *)tp; 1622 cp += offsetof(struct temp, tffn[0]); 1623 memcpy(cp, dir, len); 1624 cp += len; 1625 memcpy(cp, "/shXXXXXX.tmp", 14); 1626 /* point to the first of six Xes */ 1627 cp += 3; 1628 1629 /* cyclically attempt to open a temporary file */ 1630 do { 1631 /* generate random part of filename */ 1632 len = 0; 1633 do { 1634 cp[len++] = digits_lc[rndget() % 36]; 1635 } while (len < 6); 1636 1637 /* check if this one works */ 1638 if ((i = binopen3(tp->tffn, O_CREAT | O_EXCL | O_RDWR, 1639 0600)) < 0 && errno != EEXIST) 1640 goto maketemp_out; 1641 } while (i < 0); 1642 1643 if (type == TT_FUNSUB) { 1644 /* map us high and mark as close-on-exec */ 1645 if ((j = savefd(i)) != i) { 1646 close(i); 1647 i = j; 1648 } 1649 1650 /* operation mode for the shf */ 1651 j = SHF_RD; 1652 } else 1653 j = SHF_WR; 1654 1655 /* shf_fdopen cannot fail, so no fd leak */ 1656 tp->shf = shf_fdopen(i, j, NULL); 1657 1658 maketemp_out: 1659 tp->next = *tlist; 1660 *tlist = tp; 1661 return (tp); 1662 } 1663 1664 /* 1665 * We use a similar collision resolution algorithm as Python 2.5.4 1666 * but with a slightly tweaked implementation written from scratch. 1667 */ 1668 1669 #define INIT_TBLSHIFT 3 /* initial table shift (2^3 = 8) */ 1670 #define PERTURB_SHIFT 5 /* see Python 2.5.4 Objects/dictobject.c */ 1671 1672 static void tgrow(struct table *); 1673 static int tnamecmp(const void *, const void *); 1674 1675 static void 1676 tgrow(struct table *tp) 1677 { 1678 size_t i, j, osize, mask, perturb; 1679 struct tbl *tblp, **pp; 1680 struct tbl **ntblp, **otblp = tp->tbls; 1681 1682 if (tp->tshift > 29) 1683 internal_errorf("hash table size limit reached"); 1684 1685 /* calculate old size, new shift and new size */ 1686 osize = (size_t)1 << (tp->tshift++); 1687 i = osize << 1; 1688 1689 ntblp = alloc2(i, sizeof(struct tbl *), tp->areap); 1690 /* multiplication cannot overflow: alloc2 checked that */ 1691 memset(ntblp, 0, i * sizeof(struct tbl *)); 1692 1693 /* table can get very full when reaching its size limit */ 1694 tp->nfree = (tp->tshift == 30) ? 0x3FFF0000UL : 1695 /* but otherwise, only 75% */ 1696 ((i * 3) / 4); 1697 tp->tbls = ntblp; 1698 if (otblp == NULL) 1699 return; 1700 1701 mask = i - 1; 1702 for (i = 0; i < osize; i++) 1703 if ((tblp = otblp[i]) != NULL) { 1704 if ((tblp->flag & DEFINED)) { 1705 /* search for free hash table slot */ 1706 j = perturb = tblp->ua.hval; 1707 goto find_first_empty_slot; 1708 find_next_empty_slot: 1709 j = (j << 2) + j + perturb + 1; 1710 perturb >>= PERTURB_SHIFT; 1711 find_first_empty_slot: 1712 pp = &ntblp[j & mask]; 1713 if (*pp != NULL) 1714 goto find_next_empty_slot; 1715 /* found an empty hash table slot */ 1716 *pp = tblp; 1717 tp->nfree--; 1718 } else if (!(tblp->flag & FINUSE)) { 1719 afree(tblp, tp->areap); 1720 } 1721 } 1722 afree(otblp, tp->areap); 1723 } 1724 1725 void 1726 ktinit(Area *ap, struct table *tp, uint8_t initshift) 1727 { 1728 tp->areap = ap; 1729 tp->tbls = NULL; 1730 tp->tshift = ((initshift > INIT_TBLSHIFT) ? 1731 initshift : INIT_TBLSHIFT) - 1; 1732 tgrow(tp); 1733 } 1734 1735 /* table, name (key) to search for, hash(name), rv pointer to tbl ptr */ 1736 struct tbl * 1737 ktscan(struct table *tp, const char *name, uint32_t h, struct tbl ***ppp) 1738 { 1739 size_t j, perturb, mask; 1740 struct tbl **pp, *p; 1741 1742 mask = ((size_t)1 << (tp->tshift)) - 1; 1743 /* search for hash table slot matching name */ 1744 j = perturb = h; 1745 goto find_first_slot; 1746 find_next_slot: 1747 j = (j << 2) + j + perturb + 1; 1748 perturb >>= PERTURB_SHIFT; 1749 find_first_slot: 1750 pp = &tp->tbls[j & mask]; 1751 if ((p = *pp) != NULL && (p->ua.hval != h || !(p->flag & DEFINED) || 1752 strcmp(p->name, name))) 1753 goto find_next_slot; 1754 /* p == NULL if not found, correct found entry otherwise */ 1755 if (ppp) 1756 *ppp = pp; 1757 return (p); 1758 } 1759 1760 /* table, name (key) to enter, hash(n) */ 1761 struct tbl * 1762 ktenter(struct table *tp, const char *n, uint32_t h) 1763 { 1764 struct tbl **pp, *p; 1765 size_t len; 1766 1767 Search: 1768 if ((p = ktscan(tp, n, h, &pp))) 1769 return (p); 1770 1771 if (tp->nfree == 0) { 1772 /* too full */ 1773 tgrow(tp); 1774 goto Search; 1775 } 1776 1777 /* create new tbl entry */ 1778 len = strlen(n); 1779 checkoktoadd(len, offsetof(struct tbl, name[0]) + 1); 1780 p = alloc(offsetof(struct tbl, name[0]) + ++len, tp->areap); 1781 p->flag = 0; 1782 p->type = 0; 1783 p->areap = tp->areap; 1784 p->ua.hval = h; 1785 p->u2.field = 0; 1786 p->u.array = NULL; 1787 memcpy(p->name, n, len); 1788 1789 /* enter in tp->tbls */ 1790 tp->nfree--; 1791 *pp = p; 1792 return (p); 1793 } 1794 1795 void 1796 ktwalk(struct tstate *ts, struct table *tp) 1797 { 1798 ts->left = (size_t)1 << (tp->tshift); 1799 ts->next = tp->tbls; 1800 } 1801 1802 struct tbl * 1803 ktnext(struct tstate *ts) 1804 { 1805 while (--ts->left >= 0) { 1806 struct tbl *p = *ts->next++; 1807 if (p != NULL && (p->flag & DEFINED)) 1808 return (p); 1809 } 1810 return (NULL); 1811 } 1812 1813 static int 1814 tnamecmp(const void *p1, const void *p2) 1815 { 1816 const struct tbl *a = *((const struct tbl * const *)p1); 1817 const struct tbl *b = *((const struct tbl * const *)p2); 1818 1819 return (strcmp(a->name, b->name)); 1820 } 1821 1822 struct tbl ** 1823 ktsort(struct table *tp) 1824 { 1825 size_t i; 1826 struct tbl **p, **sp, **dp; 1827 1828 /* 1829 * since the table is never entirely full, no need to reserve 1830 * additional space for the trailing NULL appended below 1831 */ 1832 i = (size_t)1 << (tp->tshift); 1833 p = alloc2(i, sizeof(struct tbl *), ATEMP); 1834 sp = tp->tbls; /* source */ 1835 dp = p; /* dest */ 1836 while (i--) 1837 if ((*dp = *sp++) != NULL && (((*dp)->flag & DEFINED) || 1838 ((*dp)->flag & ARRAY))) 1839 dp++; 1840 qsort(p, (i = dp - p), sizeof(struct tbl *), tnamecmp); 1841 p[i] = NULL; 1842 return (p); 1843 } 1844 1845 #ifdef SIGWINCH 1846 static void 1847 x_sigwinch(int sig MKSH_A_UNUSED) 1848 { 1849 /* this runs inside interrupt context, with errno saved */ 1850 1851 got_winch = 1; 1852 } 1853 #endif 1854 1855 #ifdef DF 1856 void 1857 DF(const char *fmt, ...) 1858 { 1859 va_list args; 1860 struct timeval tv; 1861 mirtime_mjd mjd; 1862 1863 mksh_lockfd(shl_dbg_fd); 1864 mksh_TIME(tv); 1865 timet2mjd(&mjd, tv.tv_sec); 1866 shf_fprintf(shl_dbg, "[%02u:%02u:%02u (%u) %u.%06u] ", 1867 (unsigned)mjd.sec / 3600, ((unsigned)mjd.sec / 60) % 60, 1868 (unsigned)mjd.sec % 60, (unsigned)getpid(), 1869 (unsigned)tv.tv_sec, (unsigned)tv.tv_usec); 1870 va_start(args, fmt); 1871 shf_vfprintf(shl_dbg, fmt, args); 1872 va_end(args); 1873 shf_putc('\n', shl_dbg); 1874 shf_flush(shl_dbg); 1875 mksh_unlkfd(shl_dbg_fd); 1876 } 1877 #endif 1878 1879 void 1880 x_mkraw(int fd, mksh_ttyst *ocb, bool forread) 1881 { 1882 mksh_ttyst cb; 1883 1884 if (ocb) 1885 mksh_tcget(fd, ocb); 1886 else 1887 ocb = &tty_state; 1888 1889 cb = *ocb; 1890 if (forread) { 1891 cb.c_iflag &= ~(ISTRIP); 1892 cb.c_lflag &= ~(ICANON) | ECHO; 1893 } else { 1894 cb.c_iflag &= ~(INLCR | ICRNL | ISTRIP); 1895 cb.c_lflag &= ~(ISIG | ICANON | ECHO); 1896 } 1897 #if defined(VLNEXT) && defined(_POSIX_VDISABLE) 1898 /* OSF/1 processes lnext when ~icanon */ 1899 cb.c_cc[VLNEXT] = _POSIX_VDISABLE; 1900 #endif 1901 /* SunOS 4.1.x & OSF/1 processes discard(flush) when ~icanon */ 1902 #if defined(VDISCARD) && defined(_POSIX_VDISABLE) 1903 cb.c_cc[VDISCARD] = _POSIX_VDISABLE; 1904 #endif 1905 cb.c_cc[VTIME] = 0; 1906 cb.c_cc[VMIN] = 1; 1907 1908 mksh_tcset(fd, &cb); 1909 } 1910
