1 /* $OpenBSD: main.c,v 1.54 2013/11/28 10:33:37 sobrado Exp $ */ 2 /* $OpenBSD: tty.c,v 1.10 2014/08/10 02:44:26 guenther Exp $ */ 3 /* $OpenBSD: io.c,v 1.25 2014/08/11 20:28:47 guenther Exp $ */ 4 /* $OpenBSD: table.c,v 1.15 2012/02/19 07:52:30 otto Exp $ */ 5 6 /*- 7 * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 8 * 2011, 2012, 2013, 2014 9 * Thorsten Glaser <tg (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 1.284 2014/10/03 17:19:27 tg Exp $"); 38 39 extern char **environ; 40 41 #ifndef MKSHRC_PATH 42 #define MKSHRC_PATH "~/.mkshrc" 43 #endif 44 45 #ifndef MKSH_DEFAULT_TMPDIR 46 #define MKSH_DEFAULT_TMPDIR "/tmp" 47 #endif 48 49 static uint8_t isuc(const char *); 50 static int main_init(int, const char *[], Source **, struct block **); 51 void chvt_reinit(void); 52 static void reclaim(void); 53 static void remove_temps(struct temp *); 54 static mksh_uari_t rndsetup(void); 55 #ifdef SIGWINCH 56 static void x_sigwinch(int); 57 #endif 58 59 static const char initifs[] = "IFS= \t\n"; 60 61 static const char initsubs[] = 62 "${PS2=> } ${PS3=#? } ${PS4=+ } ${SECONDS=0} ${TMOUT=0} ${EPOCHREALTIME=}"; 63 64 static const char *initcoms[] = { 65 Ttypeset, "-r", initvsn, NULL, 66 Ttypeset, "-x", "HOME", "PATH", "SHELL", NULL, 67 Ttypeset, "-i10", "COLUMNS", "LINES", "SECONDS", "TMOUT", NULL, 68 Talias, 69 "integer=typeset -i", 70 Tlocal_typeset, 71 /* not "alias -t --": hash -r needs to work */ 72 "hash=alias -t", 73 "type=whence -v", 74 #if !defined(ANDROID) && !defined(MKSH_UNEMPLOYED) 75 /* not in Android for political reasons */ 76 /* not in ARGE mksh due to no job control */ 77 "stop=kill -STOP", 78 #endif 79 "autoload=typeset -fu", 80 "functions=typeset -f", 81 "history=fc -l", 82 "nameref=typeset -n", 83 "nohup=nohup ", 84 Tr_fc_e_dash, 85 "source=PATH=$PATH:. command .", 86 "login=exec login", 87 NULL, 88 /* this is what AT&T ksh seems to track, with the addition of emacs */ 89 Talias, "-tU", 90 "cat", "cc", "chmod", "cp", "date", "ed", "emacs", "grep", "ls", 91 "make", "mv", "pr", "rm", "sed", "sh", "vi", "who", NULL, 92 NULL 93 }; 94 95 static const char *restr_com[] = { 96 Ttypeset, "-r", "PATH", "ENV", "SHELL", NULL 97 }; 98 99 static bool initio_done; 100 101 /* top-level parsing and execution environment */ 102 static struct env env; 103 struct env *e = &env; 104 105 static mksh_uari_t 106 rndsetup(void) 107 { 108 register uint32_t h; 109 struct { 110 ALLOC_ITEM alloc_INT; 111 void *dataptr, *stkptr, *mallocptr; 112 #if defined(__GLIBC__) && (__GLIBC__ >= 2) 113 sigjmp_buf jbuf; 114 #endif 115 struct timeval tv; 116 } *bufptr; 117 char *cp; 118 119 cp = alloc(sizeof(*bufptr) - ALLOC_SIZE, APERM); 120 #ifdef DEBUG 121 /* clear the allocated space, for valgrind */ 122 memset(cp, 0, sizeof(*bufptr) - ALLOC_SIZE); 123 #endif 124 /* undo what alloc() did to the malloc result address */ 125 bufptr = (void *)(cp - ALLOC_SIZE); 126 /* PIE or something similar provides us with deltas here */ 127 bufptr->dataptr = &rndsetupstate; 128 /* ASLR in at least Windows, Linux, some BSDs */ 129 bufptr->stkptr = &bufptr; 130 /* randomised malloc in BSD (and possibly others) */ 131 bufptr->mallocptr = bufptr; 132 #if defined(__GLIBC__) && (__GLIBC__ >= 2) 133 /* glibc pointer guard */ 134 sigsetjmp(bufptr->jbuf, 1); 135 #endif 136 /* introduce variation (and yes, second arg MBZ for portability) */ 137 mksh_TIME(bufptr->tv); 138 139 h = chvt_rndsetup(bufptr, sizeof(*bufptr)); 140 141 afree(cp, APERM); 142 return ((mksh_uari_t)h); 143 } 144 145 void 146 chvt_reinit(void) 147 { 148 kshpid = procpid = getpid(); 149 ksheuid = geteuid(); 150 kshpgrp = getpgrp(); 151 kshppid = getppid(); 152 } 153 154 static const char *empty_argv[] = { 155 "mksh", NULL 156 }; 157 158 static uint8_t 159 isuc(const char *cx) { 160 char *cp, *x; 161 uint8_t rv = 0; 162 163 if (!cx || !*cx) 164 return (0); 165 166 /* uppercase a string duplicate */ 167 strdupx(x, cx, ATEMP); 168 cp = x; 169 while ((*cp = ksh_toupper(*cp))) 170 ++cp; 171 172 /* check for UTF-8 */ 173 if (strstr(x, "UTF-8") || strstr(x, "UTF8")) 174 rv = 1; 175 176 /* free copy and out */ 177 afree(x, ATEMP); 178 return (rv); 179 } 180 181 static int 182 main_init(int argc, const char *argv[], Source **sp, struct block **lp) 183 { 184 int argi, i; 185 Source *s = NULL; 186 struct block *l; 187 unsigned char restricted_shell, errexit, utf_flag; 188 char *cp; 189 const char *ccp, **wp; 190 struct tbl *vp; 191 struct stat s_stdin; 192 #if !defined(_PATH_DEFPATH) && defined(_CS_PATH) 193 ssize_t k; 194 #endif 195 196 /* do things like getpgrp() et al. */ 197 chvt_reinit(); 198 199 /* make sure argv[] is sane */ 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 51 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")) { 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 = "/bin:/usr/bin:/sbin:/usr/sbin"; 322 #endif 323 324 /* 325 * Set PATH to def_path (will set the path global variable). 326 * (import of environment below will probably change this setting). 327 */ 328 vp = global("PATH"); 329 /* setstr can't fail here */ 330 setstr(vp, def_path, KSH_RETURN_ERROR); 331 332 #ifndef MKSH_NO_CMDLINE_EDITING 333 /* 334 * Set edit mode to emacs by default, may be overridden 335 * by the environment or the user. Also, we want tab completion 336 * on in vi by default. 337 */ 338 change_flag(FEMACS, OF_SPECIAL, true); 339 #if !MKSH_S_NOVI 340 Flag(FVITABCOMPLETE) = 1; 341 #endif 342 #endif 343 344 /* import environment */ 345 if (environ != NULL) { 346 wp = (const char **)environ; 347 while (*wp != NULL) { 348 rndpush(*wp); 349 typeset(*wp, IMPORT | EXPORT, 0, 0, 0); 350 ++wp; 351 } 352 } 353 354 /* for security */ 355 typeset(initifs, 0, 0, 0, 0); 356 357 /* assign default shell variable values */ 358 substitute(initsubs, 0); 359 360 /* Figure out the current working directory and set $PWD */ 361 vp = global("PWD"); 362 cp = str_val(vp); 363 /* Try to use existing $PWD if it is valid */ 364 set_current_wd((cp[0] == '/' && test_eval(NULL, TO_FILEQ, cp, ".", 365 true)) ? cp : NULL); 366 if (current_wd[0]) 367 simplify_path(current_wd); 368 /* Only set pwd if we know where we are or if it had a bogus value */ 369 if (current_wd[0] || *cp) 370 /* setstr can't fail here */ 371 setstr(vp, current_wd, KSH_RETURN_ERROR); 372 373 for (wp = initcoms; *wp != NULL; wp++) { 374 shcomexec(wp); 375 while (*wp != NULL) 376 wp++; 377 } 378 setint_n(global("OPTIND"), 1, 10); 379 380 kshuid = getuid(); 381 kshgid = getgid(); 382 kshegid = getegid(); 383 384 safe_prompt = ksheuid ? "$ " : "# "; 385 vp = global("PS1"); 386 /* Set PS1 if unset or we are root and prompt doesn't contain a # */ 387 if (!(vp->flag & ISSET) || 388 (!ksheuid && !strchr(str_val(vp), '#'))) 389 /* setstr can't fail here */ 390 setstr(vp, safe_prompt, KSH_RETURN_ERROR); 391 setint_n((vp = global("BASHPID")), 0, 10); 392 vp->flag |= INT_U; 393 setint_n((vp = global("PGRP")), (mksh_uari_t)kshpgrp, 10); 394 vp->flag |= INT_U; 395 setint_n((vp = global("PPID")), (mksh_uari_t)kshppid, 10); 396 vp->flag |= INT_U; 397 setint_n((vp = global("USER_ID")), (mksh_uari_t)ksheuid, 10); 398 vp->flag |= INT_U; 399 setint_n((vp = global("KSHUID")), (mksh_uari_t)kshuid, 10); 400 vp->flag |= INT_U; 401 setint_n((vp = global("KSHEGID")), (mksh_uari_t)kshegid, 10); 402 vp->flag |= INT_U; 403 setint_n((vp = global("KSHGID")), (mksh_uari_t)kshgid, 10); 404 vp->flag |= INT_U; 405 setint_n((vp = global("RANDOM")), rndsetup(), 10); 406 vp->flag |= INT_U; 407 setint_n((vp_pipest = global("PIPESTATUS")), 0, 10); 408 409 /* Set this before parsing arguments */ 410 Flag(FPRIVILEGED) = ( 411 #if HAVE_ISSETUGID 412 issetugid() || 413 #endif 414 kshuid != ksheuid || kshgid != kshegid) ? 2 : 0; 415 416 /* this to note if monitor is set on command line (see below) */ 417 #ifndef MKSH_UNEMPLOYED 418 Flag(FMONITOR) = 127; 419 #endif 420 /* this to note if utf-8 mode is set on command line (see below) */ 421 UTFMODE = 2; 422 423 if (!Flag(FAS_BUILTIN)) { 424 argi = parse_args(argv, OF_CMDLINE, NULL); 425 if (argi < 0) 426 return (1); 427 } 428 429 /* process this later only, default to off (hysterical raisins) */ 430 utf_flag = UTFMODE; 431 UTFMODE = 0; 432 433 if (Flag(FAS_BUILTIN)) { 434 /* auto-detect from environment variables, always */ 435 utf_flag = 3; 436 } else if (Flag(FCOMMAND)) { 437 s = pushs(SSTRINGCMDLINE, ATEMP); 438 if (!(s->start = s->str = argv[argi++])) 439 errorf("%s %s", "-c", "requires an argument"); 440 while (*s->str) { 441 if (*s->str != ' ' && ctype(*s->str, C_QUOTE)) 442 break; 443 s->str++; 444 } 445 if (!*s->str) 446 s->flags |= SF_MAYEXEC; 447 s->str = s->start; 448 #ifdef MKSH_MIDNIGHTBSD01ASH_COMPAT 449 /* compatibility to MidnightBSD 0.1 /bin/sh (kludge) */ 450 if (Flag(FSH) && argv[argi] && !strcmp(argv[argi], "--")) 451 ++argi; 452 #endif 453 if (argv[argi]) 454 kshname = argv[argi++]; 455 } else if (argi < argc && !Flag(FSTDIN)) { 456 s = pushs(SFILE, ATEMP); 457 s->file = argv[argi++]; 458 s->u.shf = shf_open(s->file, O_RDONLY, 0, 459 SHF_MAPHI | SHF_CLEXEC); 460 if (s->u.shf == NULL) { 461 shl_stdout_ok = false; 462 warningf(true, "%s: %s", s->file, cstrerror(errno)); 463 /* mandated by SUSv4 */ 464 exstat = 127; 465 unwind(LERROR); 466 } 467 kshname = s->file; 468 } else { 469 Flag(FSTDIN) = 1; 470 s = pushs(SSTDIN, ATEMP); 471 s->file = "<stdin>"; 472 s->u.shf = shf_fdopen(0, SHF_RD | can_seek(0), 473 NULL); 474 if (isatty(0) && isatty(2)) { 475 Flag(FTALKING) = Flag(FTALKING_I) = 1; 476 /* The following only if isatty(0) */ 477 s->flags |= SF_TTY; 478 s->u.shf->flags |= SHF_INTERRUPT; 479 s->file = NULL; 480 } 481 } 482 483 /* this bizarreness is mandated by POSIX */ 484 if (fstat(0, &s_stdin) >= 0 && S_ISCHR(s_stdin.st_mode) && 485 Flag(FTALKING)) 486 reset_nonblock(0); 487 488 /* initialise job control */ 489 j_init(); 490 /* do this after j_init() which calls tty_init_state() */ 491 if (Flag(FTALKING)) { 492 if (utf_flag == 2) { 493 #ifndef MKSH_ASSUME_UTF8 494 /* auto-detect from locale or environment */ 495 utf_flag = 4; 496 #else /* this may not be an #elif */ 497 #if MKSH_ASSUME_UTF8 498 utf_flag = 1; 499 #else 500 /* always disable UTF-8 (for interactive) */ 501 utf_flag = 0; 502 #endif 503 #endif 504 } 505 #ifndef MKSH_NO_CMDLINE_EDITING 506 x_init(); 507 #endif 508 } 509 510 #ifdef SIGWINCH 511 sigtraps[SIGWINCH].flags |= TF_SHELL_USES; 512 setsig(&sigtraps[SIGWINCH], x_sigwinch, 513 SS_RESTORE_ORIG|SS_FORCE|SS_SHTRAP); 514 #endif 515 516 l = e->loc; 517 if (Flag(FAS_BUILTIN)) { 518 l->argc = argc; 519 l->argv = argv; 520 l->argv[0] = ccp; 521 } else { 522 l->argc = argc - argi; 523 /* 524 * allocate a new array because otherwise, when we modify 525 * it in-place, ps(1) output changes; the meaning of argc 526 * here is slightly different as it excludes kshname, and 527 * we add a trailing NULL sentinel as well 528 */ 529 l->argv = alloc2(l->argc + 2, sizeof(void *), APERM); 530 l->argv[0] = kshname; 531 memcpy(&l->argv[1], &argv[argi], l->argc * sizeof(void *)); 532 l->argv[l->argc + 1] = NULL; 533 getopts_reset(1); 534 } 535 536 /* divine the initial state of the utf8-mode Flag */ 537 ccp = null; 538 switch (utf_flag) { 539 540 /* auto-detect from locale or environment */ 541 case 4: 542 #if HAVE_SETLOCALE_CTYPE 543 ccp = setlocale(LC_CTYPE, ""); 544 #if HAVE_LANGINFO_CODESET 545 if (!isuc(ccp)) 546 ccp = nl_langinfo(CODESET); 547 #endif 548 if (!isuc(ccp)) 549 ccp = null; 550 /* FALLTHROUGH */ 551 #endif 552 553 /* auto-detect from environment */ 554 case 3: 555 /* these were imported from environ earlier */ 556 if (ccp == null) 557 ccp = str_val(global("LC_ALL")); 558 if (ccp == null) 559 ccp = str_val(global("LC_CTYPE")); 560 if (ccp == null) 561 ccp = str_val(global("LANG")); 562 UTFMODE = isuc(ccp); 563 break; 564 565 /* not set on command line, not FTALKING */ 566 case 2: 567 /* unknown values */ 568 default: 569 utf_flag = 0; 570 /* FALLTHROUGH */ 571 572 /* known values */ 573 case 1: 574 case 0: 575 UTFMODE = utf_flag; 576 break; 577 } 578 579 /* Disable during .profile/ENV reading */ 580 restricted_shell = Flag(FRESTRICTED); 581 Flag(FRESTRICTED) = 0; 582 errexit = Flag(FERREXIT); 583 Flag(FERREXIT) = 0; 584 585 /* 586 * Do this before profile/$ENV so that if it causes problems in them, 587 * user will know why things broke. 588 */ 589 if (!current_wd[0] && Flag(FTALKING)) 590 warningf(false, "can't determine current directory"); 591 592 if (Flag(FLOGIN)) 593 include(MKSH_SYSTEM_PROFILE, 0, NULL, true); 594 if (!Flag(FPRIVILEGED)) { 595 if (Flag(FLOGIN)) 596 include(substitute("$HOME/.profile", 0), 0, NULL, true); 597 if (Flag(FTALKING)) { 598 cp = substitute(substitute("${ENV:-" MKSHRC_PATH "}", 599 0), DOTILDE); 600 if (cp[0] != '\0') 601 include(cp, 0, NULL, true); 602 } 603 } else { 604 include(MKSH_SUID_PROFILE, 0, NULL, true); 605 /* turn off -p if not set explicitly */ 606 if (Flag(FPRIVILEGED) != 1) 607 change_flag(FPRIVILEGED, OF_INTERNAL, false); 608 } 609 610 if (restricted_shell) { 611 shcomexec(restr_com); 612 /* After typeset command... */ 613 Flag(FRESTRICTED) = 1; 614 } 615 Flag(FERREXIT) = errexit; 616 617 if (Flag(FTALKING) && s) 618 hist_init(s); 619 else 620 /* set after ENV */ 621 Flag(FTRACKALL) = 1; 622 623 alarm_init(); 624 625 *sp = s; 626 *lp = l; 627 return (0); 628 } 629 630 /* this indirection barrier reduces stack usage during normal operation */ 631 632 int 633 main(int argc, const char *argv[]) 634 { 635 int rv; 636 Source *s; 637 struct block *l; 638 639 if ((rv = main_init(argc, argv, &s, &l)) == 0) { 640 if (Flag(FAS_BUILTIN)) { 641 rv = shcomexec(l->argv); 642 } else { 643 shell(s, true); 644 /* NOTREACHED */ 645 } 646 } 647 return (rv); 648 } 649 650 int 651 include(const char *name, int argc, const char **argv, bool intr_ok) 652 { 653 Source *volatile s = NULL; 654 struct shf *shf; 655 const char **volatile old_argv; 656 volatile int old_argc; 657 int i; 658 659 shf = shf_open(name, O_RDONLY, 0, SHF_MAPHI | SHF_CLEXEC); 660 if (shf == NULL) 661 return (-1); 662 663 if (argv) { 664 old_argv = e->loc->argv; 665 old_argc = e->loc->argc; 666 } else { 667 old_argv = NULL; 668 old_argc = 0; 669 } 670 newenv(E_INCL); 671 if ((i = kshsetjmp(e->jbuf))) { 672 quitenv(s ? s->u.shf : NULL); 673 if (old_argv) { 674 e->loc->argv = old_argv; 675 e->loc->argc = old_argc; 676 } 677 switch (i) { 678 case LRETURN: 679 case LERROR: 680 /* see below */ 681 return (exstat & 0xFF); 682 case LINTR: 683 /* 684 * intr_ok is set if we are including .profile or $ENV. 685 * If user ^Cs out, we don't want to kill the shell... 686 */ 687 if (intr_ok && ((exstat & 0xFF) - 128) != SIGTERM) 688 return (1); 689 /* FALLTHROUGH */ 690 case LEXIT: 691 case LLEAVE: 692 case LSHELL: 693 unwind(i); 694 /* NOTREACHED */ 695 default: 696 internal_errorf("%s %d", "include", i); 697 /* NOTREACHED */ 698 } 699 } 700 if (argv) { 701 e->loc->argv = argv; 702 e->loc->argc = argc; 703 } 704 s = pushs(SFILE, ATEMP); 705 s->u.shf = shf; 706 strdupx(s->file, name, ATEMP); 707 i = shell(s, false); 708 quitenv(s->u.shf); 709 if (old_argv) { 710 e->loc->argv = old_argv; 711 e->loc->argc = old_argc; 712 } 713 /* & 0xff to ensure value not -1 */ 714 return (i & 0xFF); 715 } 716 717 /* spawn a command into a shell optionally keeping track of the line number */ 718 int 719 command(const char *comm, int line) 720 { 721 Source *s; 722 723 s = pushs(SSTRING, ATEMP); 724 s->start = s->str = comm; 725 s->line = line; 726 return (shell(s, false)); 727 } 728 729 /* 730 * run the commands from the input source, returning status. 731 */ 732 int 733 shell(Source * volatile s, volatile bool toplevel) 734 { 735 struct op *t; 736 volatile bool wastty = tobool(s->flags & SF_TTY); 737 volatile uint8_t attempts = 13; 738 volatile bool interactive = Flag(FTALKING) && toplevel; 739 volatile bool sfirst = true; 740 Source *volatile old_source = source; 741 int i; 742 743 newenv(E_PARSE); 744 if (interactive) 745 really_exit = false; 746 switch ((i = kshsetjmp(e->jbuf))) { 747 case 0: 748 break; 749 case LINTR: 750 /* we get here if SIGINT not caught or ignored */ 751 case LERROR: 752 case LSHELL: 753 if (interactive) { 754 if (i == LINTR) 755 shellf("\n"); 756 /* 757 * Reset any eof that was read as part of a 758 * multiline command. 759 */ 760 if (Flag(FIGNOREEOF) && s->type == SEOF && wastty) 761 s->type = SSTDIN; 762 /* 763 * Used by exit command to get back to 764 * top level shell. Kind of strange since 765 * interactive is set if we are reading from 766 * a tty, but to have stopped jobs, one only 767 * needs FMONITOR set (not FTALKING/SF_TTY)... 768 */ 769 /* toss any input we have so far */ 770 yyrecursive_pop(true); 771 s->start = s->str = null; 772 retrace_info = NULL; 773 herep = heres; 774 break; 775 } 776 /* FALLTHROUGH */ 777 case LEXIT: 778 case LLEAVE: 779 case LRETURN: 780 source = old_source; 781 quitenv(NULL); 782 /* keep on going */ 783 unwind(i); 784 /* NOTREACHED */ 785 default: 786 source = old_source; 787 quitenv(NULL); 788 internal_errorf("%s %d", "shell", i); 789 /* NOTREACHED */ 790 } 791 while (/* CONSTCOND */ 1) { 792 if (trap) 793 runtraps(0); 794 795 if (s->next == NULL) { 796 if (Flag(FVERBOSE)) 797 s->flags |= SF_ECHO; 798 else 799 s->flags &= ~SF_ECHO; 800 } 801 if (interactive) { 802 j_notify(); 803 set_prompt(PS1, s); 804 } 805 t = compile(s, sfirst); 806 sfirst = false; 807 if (!t) 808 goto source_no_tree; 809 if (t->type == TEOF) { 810 if (wastty && Flag(FIGNOREEOF) && --attempts > 0) { 811 shellf("Use 'exit' to leave mksh\n"); 812 s->type = SSTDIN; 813 } else if (wastty && !really_exit && 814 j_stopped_running()) { 815 really_exit = true; 816 s->type = SSTDIN; 817 } else { 818 /* 819 * this for POSIX which says EXIT traps 820 * shall be taken in the environment 821 * immediately after the last command 822 * executed. 823 */ 824 if (toplevel) 825 unwind(LEXIT); 826 break; 827 } 828 } else if ((s->flags & SF_MAYEXEC) && t->type == TCOM) 829 t->u.evalflags |= DOTCOMEXEC; 830 if (!Flag(FNOEXEC) || (s->flags & SF_TTY)) 831 exstat = execute(t, 0, NULL) & 0xFF; 832 833 if (t->type != TEOF && interactive && really_exit) 834 really_exit = false; 835 836 source_no_tree: 837 reclaim(); 838 } 839 quitenv(NULL); 840 source = old_source; 841 return (exstat & 0xFF); 842 } 843 844 /* return to closest error handler or shell(), exit if none found */ 845 /* note: i MUST NOT be 0 */ 846 void 847 unwind(int i) 848 { 849 /* 850 * This is a kludge. We need to restore everything that was 851 * changed in the new environment, see cid 1005090337C7A669439 852 * and 10050903386452ACBF1, but fail to even save things most of 853 * the time. funcs.c:c_eval() changes FERREXIT temporarily to 0, 854 * which needs to be restored thus (related to Debian #696823). 855 * We did not save the shell flags, so we use a special or'd 856 * value here... this is mostly to clean up behind *other* 857 * callers of unwind(LERROR) here; exec.c has the regular case. 858 */ 859 if (Flag(FERREXIT) & 0x80) { 860 /* GNU bash does not run this trapsig */ 861 trapsig(ksh_SIGERR); 862 Flag(FERREXIT) &= ~0x80; 863 } 864 865 /* ordering for EXIT vs ERR is a bit odd (this is what AT&T ksh does) */ 866 if (i == LEXIT || ((i == LERROR || i == LINTR) && 867 sigtraps[ksh_SIGEXIT].trap && 868 (!Flag(FTALKING) || Flag(FERREXIT)))) { 869 ++trap_nested; 870 runtrap(&sigtraps[ksh_SIGEXIT], trap_nested == 1); 871 --trap_nested; 872 i = LLEAVE; 873 } else if (Flag(FERREXIT) == 1 && (i == LERROR || i == LINTR)) { 874 ++trap_nested; 875 runtrap(&sigtraps[ksh_SIGERR], trap_nested == 1); 876 --trap_nested; 877 i = LLEAVE; 878 } 879 880 while (/* CONSTCOND */ 1) { 881 switch (e->type) { 882 case E_PARSE: 883 case E_FUNC: 884 case E_INCL: 885 case E_LOOP: 886 case E_ERRH: 887 kshlongjmp(e->jbuf, i); 888 /* NOTREACHED */ 889 case E_NONE: 890 if (i == LINTR) 891 e->flags |= EF_FAKE_SIGDIE; 892 /* FALLTHROUGH */ 893 default: 894 quitenv(NULL); 895 } 896 } 897 } 898 899 void 900 newenv(int type) 901 { 902 struct env *ep; 903 char *cp; 904 905 /* 906 * struct env includes ALLOC_ITEM for alignment constraints 907 * so first get the actually used memory, then assign it 908 */ 909 cp = alloc(sizeof(struct env) - ALLOC_SIZE, ATEMP); 910 /* undo what alloc() did to the malloc result address */ 911 ep = (void *)(cp - ALLOC_SIZE); 912 /* initialise public members of struct env (not the ALLOC_ITEM) */ 913 ainit(&ep->area); 914 ep->oenv = e; 915 ep->loc = e->loc; 916 ep->savefd = NULL; 917 ep->temps = NULL; 918 ep->yyrecursive_statep = NULL; 919 ep->type = type; 920 ep->flags = 0; 921 /* jump buffer is invalid because flags == 0 */ 922 e = ep; 923 } 924 925 void 926 quitenv(struct shf *shf) 927 { 928 struct env *ep = e; 929 char *cp; 930 int fd; 931 932 yyrecursive_pop(true); 933 while (ep->oenv && ep->oenv->loc != ep->loc) 934 popblock(); 935 if (ep->savefd != NULL) { 936 for (fd = 0; fd < NUFILE; fd++) 937 /* if ep->savefd[fd] < 0, means fd was closed */ 938 if (ep->savefd[fd]) 939 restfd(fd, ep->savefd[fd]); 940 if (ep->savefd[2]) 941 /* Clear any write errors */ 942 shf_reopen(2, SHF_WR, shl_out); 943 } 944 /* 945 * Bottom of the stack. 946 * Either main shell is exiting or cleanup_parents_env() was called. 947 */ 948 if (ep->oenv == NULL) { 949 #ifdef DEBUG_LEAKS 950 int i; 951 #endif 952 953 if (ep->type == E_NONE) { 954 /* Main shell exiting? */ 955 #if HAVE_PERSISTENT_HISTORY 956 if (Flag(FTALKING)) 957 hist_finish(); 958 #endif 959 j_exit(); 960 if (ep->flags & EF_FAKE_SIGDIE) { 961 int sig = (exstat & 0xFF) - 128; 962 963 /* 964 * ham up our death a bit (AT&T ksh 965 * only seems to do this for SIGTERM) 966 * Don't do it for SIGQUIT, since we'd 967 * dump a core.. 968 */ 969 if ((sig == SIGINT || sig == SIGTERM) && 970 (kshpgrp == kshpid)) { 971 setsig(&sigtraps[sig], SIG_DFL, 972 SS_RESTORE_CURR | SS_FORCE); 973 kill(0, sig); 974 } 975 } 976 } 977 if (shf) 978 shf_close(shf); 979 reclaim(); 980 #ifdef DEBUG_LEAKS 981 #ifndef MKSH_NO_CMDLINE_EDITING 982 x_done(); 983 #endif 984 #ifndef MKSH_NOPROSPECTOFWORK 985 /* block at least SIGCHLD during/after afreeall */ 986 sigprocmask(SIG_BLOCK, &sm_sigchld, NULL); 987 #endif 988 afreeall(APERM); 989 for (fd = 3; fd < NUFILE; fd++) 990 if ((i = fcntl(fd, F_GETFD, 0)) != -1 && 991 (i & FD_CLOEXEC)) 992 close(fd); 993 close(2); 994 close(1); 995 close(0); 996 #endif 997 exit(exstat & 0xFF); 998 } 999 if (shf) 1000 shf_close(shf); 1001 reclaim(); 1002 1003 e = e->oenv; 1004 1005 /* free the struct env - tricky due to the ALLOC_ITEM inside */ 1006 cp = (void *)ep; 1007 afree(cp + ALLOC_SIZE, ATEMP); 1008 } 1009 1010 /* Called after a fork to cleanup stuff left over from parents environment */ 1011 void 1012 cleanup_parents_env(void) 1013 { 1014 struct env *ep; 1015 int fd; 1016 1017 mkssert(e != NULL); 1018 1019 /* 1020 * Don't clean up temporary files - parent will probably need them. 1021 * Also, can't easily reclaim memory since variables, etc. could be 1022 * anywhere. 1023 */ 1024 1025 /* close all file descriptors hiding in savefd */ 1026 for (ep = e; ep; ep = ep->oenv) { 1027 if (ep->savefd) { 1028 for (fd = 0; fd < NUFILE; fd++) 1029 if (ep->savefd[fd] > 0) 1030 close(ep->savefd[fd]); 1031 afree(ep->savefd, &ep->area); 1032 ep->savefd = NULL; 1033 } 1034 #ifdef DEBUG_LEAKS 1035 if (ep->type != E_NONE) 1036 ep->type = E_GONE; 1037 #endif 1038 } 1039 #ifndef DEBUG_LEAKS 1040 e->oenv = NULL; 1041 #endif 1042 } 1043 1044 /* Called just before an execve cleanup stuff temporary files */ 1045 void 1046 cleanup_proc_env(void) 1047 { 1048 struct env *ep; 1049 1050 for (ep = e; ep; ep = ep->oenv) 1051 remove_temps(ep->temps); 1052 } 1053 1054 /* remove temp files and free ATEMP Area */ 1055 static void 1056 reclaim(void) 1057 { 1058 struct block *l; 1059 1060 while ((l = e->loc) && (!e->oenv || e->oenv->loc != l)) { 1061 e->loc = l->next; 1062 afreeall(&l->area); 1063 } 1064 1065 remove_temps(e->temps); 1066 e->temps = NULL; 1067 afreeall(&e->area); 1068 } 1069 1070 static void 1071 remove_temps(struct temp *tp) 1072 { 1073 for (; tp != NULL; tp = tp->next) 1074 if (tp->pid == procpid) 1075 unlink(tp->tffn); 1076 } 1077 1078 /* 1079 * Initialise tty_fd. Used for tracking the size of the terminal, 1080 * saving/resetting tty modes upon forground job completion, and 1081 * for setting up the tty process group. Return values: 1082 * 0 = got controlling tty 1083 * 1 = got terminal but no controlling tty 1084 * 2 = cannot find a terminal 1085 * 3 = cannot dup fd 1086 * 4 = cannot make fd close-on-exec 1087 * An existing tty_fd is cached if no "better" one could be found, 1088 * i.e. if tty_devtty was already set or the new would not set it. 1089 */ 1090 int 1091 tty_init_fd(void) 1092 { 1093 int fd, rv, eno = 0; 1094 bool do_close = false, is_devtty = true; 1095 1096 if (tty_devtty) { 1097 /* already got a tty which is /dev/tty */ 1098 return (0); 1099 } 1100 1101 #ifdef _UWIN 1102 /*XXX imake style */ 1103 if (isatty(3)) { 1104 /* fd 3 on UWIN _is_ /dev/tty (or our controlling tty) */ 1105 fd = 3; 1106 goto got_fd; 1107 } 1108 #endif 1109 if ((fd = open("/dev/tty", O_RDWR, 0)) >= 0) { 1110 do_close = true; 1111 goto got_fd; 1112 } 1113 eno = errno; 1114 1115 if (tty_fd >= 0) { 1116 /* already got a non-devtty one */ 1117 rv = 1; 1118 goto out; 1119 } 1120 is_devtty = false; 1121 1122 if (isatty((fd = 0)) || isatty((fd = 2))) 1123 goto got_fd; 1124 /* cannot find one */ 1125 rv = 2; 1126 /* assert: do_close == false */ 1127 goto out; 1128 1129 got_fd: 1130 if ((rv = fcntl(fd, F_DUPFD, FDBASE)) < 0) { 1131 eno = errno; 1132 rv = 3; 1133 goto out; 1134 } 1135 if (fcntl(rv, F_SETFD, FD_CLOEXEC) < 0) { 1136 eno = errno; 1137 close(rv); 1138 rv = 4; 1139 goto out; 1140 } 1141 tty_fd = rv; 1142 tty_devtty = is_devtty; 1143 rv = eno = 0; 1144 out: 1145 if (do_close) 1146 close(fd); 1147 errno = eno; 1148 return (rv); 1149 } 1150 1151 /* A shell error occurred (eg, syntax error, etc.) */ 1152 1153 #define VWARNINGF_ERRORPREFIX 1 1154 #define VWARNINGF_FILELINE 2 1155 #define VWARNINGF_BUILTIN 4 1156 #define VWARNINGF_INTERNAL 8 1157 1158 static void vwarningf(unsigned int, const char *, va_list) 1159 MKSH_A_FORMAT(__printf__, 2, 0); 1160 1161 static void 1162 vwarningf(unsigned int flags, const char *fmt, va_list ap) 1163 { 1164 if (fmt) { 1165 if (flags & VWARNINGF_INTERNAL) 1166 shf_fprintf(shl_out, "internal error: "); 1167 if (flags & VWARNINGF_ERRORPREFIX) 1168 error_prefix(tobool(flags & VWARNINGF_FILELINE)); 1169 if ((flags & VWARNINGF_BUILTIN) && 1170 /* not set when main() calls parse_args() */ 1171 builtin_argv0 && builtin_argv0 != kshname) 1172 shf_fprintf(shl_out, "%s: ", builtin_argv0); 1173 shf_vfprintf(shl_out, fmt, ap); 1174 shf_putchar('\n', shl_out); 1175 } 1176 shf_flush(shl_out); 1177 } 1178 1179 void 1180 errorfx(int rc, const char *fmt, ...) 1181 { 1182 va_list va; 1183 1184 exstat = rc; 1185 1186 /* debugging: note that stdout not valid */ 1187 shl_stdout_ok = false; 1188 1189 va_start(va, fmt); 1190 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va); 1191 va_end(va); 1192 unwind(LERROR); 1193 } 1194 1195 void 1196 errorf(const char *fmt, ...) 1197 { 1198 va_list va; 1199 1200 exstat = 1; 1201 1202 /* debugging: note that stdout not valid */ 1203 shl_stdout_ok = false; 1204 1205 va_start(va, fmt); 1206 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va); 1207 va_end(va); 1208 unwind(LERROR); 1209 } 1210 1211 /* like errorf(), but no unwind is done */ 1212 void 1213 warningf(bool fileline, const char *fmt, ...) 1214 { 1215 va_list va; 1216 1217 va_start(va, fmt); 1218 vwarningf(VWARNINGF_ERRORPREFIX | (fileline ? VWARNINGF_FILELINE : 0), 1219 fmt, va); 1220 va_end(va); 1221 } 1222 1223 /* 1224 * Used by built-in utilities to prefix shell and utility name to message 1225 * (also unwinds environments for special builtins). 1226 */ 1227 void 1228 bi_errorf(const char *fmt, ...) 1229 { 1230 va_list va; 1231 1232 /* debugging: note that stdout not valid */ 1233 shl_stdout_ok = false; 1234 1235 exstat = 1; 1236 1237 va_start(va, fmt); 1238 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE | 1239 VWARNINGF_BUILTIN, fmt, va); 1240 va_end(va); 1241 1242 /* 1243 * POSIX special builtins and ksh special builtins cause 1244 * non-interactive shells to exit. 1245 * XXX odd use of KEEPASN; also may not want LERROR here 1246 */ 1247 if (builtin_flag & SPEC_BI) { 1248 builtin_argv0 = NULL; 1249 unwind(LERROR); 1250 } 1251 } 1252 1253 /* Called when something that shouldn't happen does */ 1254 void 1255 internal_errorf(const char *fmt, ...) 1256 { 1257 va_list va; 1258 1259 va_start(va, fmt); 1260 vwarningf(VWARNINGF_INTERNAL, fmt, va); 1261 va_end(va); 1262 unwind(LERROR); 1263 } 1264 1265 void 1266 internal_warningf(const char *fmt, ...) 1267 { 1268 va_list va; 1269 1270 va_start(va, fmt); 1271 vwarningf(VWARNINGF_INTERNAL, fmt, va); 1272 va_end(va); 1273 } 1274 1275 /* used by error reporting functions to print "ksh: .kshrc[25]: " */ 1276 void 1277 error_prefix(bool fileline) 1278 { 1279 /* Avoid foo: foo[2]: ... */ 1280 if (!fileline || !source || !source->file || 1281 strcmp(source->file, kshname) != 0) 1282 shf_fprintf(shl_out, "%s: ", kshname + (*kshname == '-')); 1283 if (fileline && source && source->file != NULL) { 1284 shf_fprintf(shl_out, "%s[%d]: ", source->file, 1285 source->errline > 0 ? source->errline : source->line); 1286 source->errline = 0; 1287 } 1288 } 1289 1290 /* printf to shl_out (stderr) with flush */ 1291 void 1292 shellf(const char *fmt, ...) 1293 { 1294 va_list va; 1295 1296 if (!initio_done) 1297 /* shl_out may not be set up yet... */ 1298 return; 1299 va_start(va, fmt); 1300 shf_vfprintf(shl_out, fmt, va); 1301 va_end(va); 1302 shf_flush(shl_out); 1303 } 1304 1305 /* printf to shl_stdout (stdout) */ 1306 void 1307 shprintf(const char *fmt, ...) 1308 { 1309 va_list va; 1310 1311 if (!shl_stdout_ok) 1312 internal_errorf("shl_stdout not valid"); 1313 va_start(va, fmt); 1314 shf_vfprintf(shl_stdout, fmt, va); 1315 va_end(va); 1316 } 1317 1318 /* test if we can seek backwards fd (returns 0 or SHF_UNBUF) */ 1319 int 1320 can_seek(int fd) 1321 { 1322 struct stat statb; 1323 1324 return (fstat(fd, &statb) == 0 && !S_ISREG(statb.st_mode) ? 1325 SHF_UNBUF : 0); 1326 } 1327 1328 #ifdef DF 1329 int shl_dbg_fd; 1330 #define NSHF_IOB 4 1331 #else 1332 #define NSHF_IOB 3 1333 #endif 1334 struct shf shf_iob[NSHF_IOB]; 1335 1336 void 1337 initio(void) 1338 { 1339 #ifdef DF 1340 const char *lfp; 1341 #endif 1342 1343 /* force buffer allocation */ 1344 shf_fdopen(1, SHF_WR, shl_stdout); 1345 shf_fdopen(2, SHF_WR, shl_out); 1346 shf_fdopen(2, SHF_WR, shl_xtrace); 1347 #ifdef DF 1348 if ((lfp = getenv("SDMKSH_PATH")) == NULL) { 1349 if ((lfp = getenv("HOME")) == NULL || *lfp != '/') 1350 errorf("cannot get home directory"); 1351 lfp = shf_smprintf("%s/mksh-dbg.txt", lfp); 1352 } 1353 1354 if ((shl_dbg_fd = open(lfp, O_WRONLY | O_APPEND | O_CREAT, 0600)) < 0) 1355 errorf("cannot open debug output file %s", lfp); 1356 if (shl_dbg_fd < FDBASE) { 1357 int nfd; 1358 1359 nfd = fcntl(shl_dbg_fd, F_DUPFD, FDBASE); 1360 close(shl_dbg_fd); 1361 if ((shl_dbg_fd = nfd) == -1) 1362 errorf("cannot dup debug output file"); 1363 } 1364 fcntl(shl_dbg_fd, F_SETFD, FD_CLOEXEC); 1365 shf_fdopen(shl_dbg_fd, SHF_WR, shl_dbg); 1366 DF("=== open ==="); 1367 #endif 1368 initio_done = true; 1369 } 1370 1371 /* A dup2() with error checking */ 1372 int 1373 ksh_dup2(int ofd, int nfd, bool errok) 1374 { 1375 int rv; 1376 1377 if (((rv = dup2(ofd, nfd)) < 0) && !errok && (errno != EBADF)) 1378 errorf("too many files open in shell"); 1379 1380 #ifdef __ultrix 1381 /*XXX imake style */ 1382 if (rv >= 0) 1383 fcntl(nfd, F_SETFD, 0); 1384 #endif 1385 1386 return (rv); 1387 } 1388 1389 /* 1390 * Move fd from user space (0 <= fd < 10) to shell space (fd >= 10), 1391 * set close-on-exec flag. See FDBASE in sh.h, maybe 24 not 10 here. 1392 */ 1393 short 1394 savefd(int fd) 1395 { 1396 int nfd = fd; 1397 1398 if (fd < FDBASE && (nfd = fcntl(fd, F_DUPFD, FDBASE)) < 0 && 1399 errno == EBADF) 1400 return (-1); 1401 if (nfd < 0 || nfd > SHRT_MAX) 1402 errorf("too many files open in shell"); 1403 fcntl(nfd, F_SETFD, FD_CLOEXEC); 1404 return ((short)nfd); 1405 } 1406 1407 void 1408 restfd(int fd, int ofd) 1409 { 1410 if (fd == 2) 1411 shf_flush(&shf_iob[/* fd */ 2]); 1412 if (ofd < 0) 1413 /* original fd closed */ 1414 close(fd); 1415 else if (fd != ofd) { 1416 /*XXX: what to do if this dup fails? */ 1417 ksh_dup2(ofd, fd, true); 1418 close(ofd); 1419 } 1420 } 1421 1422 void 1423 openpipe(int *pv) 1424 { 1425 int lpv[2]; 1426 1427 if (pipe(lpv) < 0) 1428 errorf("can't create pipe - try again"); 1429 pv[0] = savefd(lpv[0]); 1430 if (pv[0] != lpv[0]) 1431 close(lpv[0]); 1432 pv[1] = savefd(lpv[1]); 1433 if (pv[1] != lpv[1]) 1434 close(lpv[1]); 1435 } 1436 1437 void 1438 closepipe(int *pv) 1439 { 1440 close(pv[0]); 1441 close(pv[1]); 1442 } 1443 1444 /* 1445 * Called by iosetup() (deals with 2>&4, etc.), c_read, c_print to turn 1446 * a string (the X in 2>&X, read -uX, print -uX) into a file descriptor. 1447 */ 1448 int 1449 check_fd(const char *name, int mode, const char **emsgp) 1450 { 1451 int fd, fl; 1452 1453 if (name[0] == 'p' && !name[1]) 1454 return (coproc_getfd(mode, emsgp)); 1455 for (fd = 0; ksh_isdigit(*name); ++name) 1456 fd = (fd * 10) + *name - '0'; 1457 if (*name || fd >= FDBASE) { 1458 if (emsgp) 1459 *emsgp = "illegal file descriptor name"; 1460 return (-1); 1461 } 1462 if ((fl = fcntl(fd, F_GETFL, 0)) < 0) { 1463 if (emsgp) 1464 *emsgp = "bad file descriptor"; 1465 return (-1); 1466 } 1467 fl &= O_ACCMODE; 1468 /* 1469 * X_OK is a kludge to disable this check for dups (x<&1): 1470 * historical shells never did this check (XXX don't know what 1471 * POSIX has to say). 1472 */ 1473 if (!(mode & X_OK) && fl != O_RDWR && ( 1474 ((mode & R_OK) && fl != O_RDONLY) || 1475 ((mode & W_OK) && fl != O_WRONLY))) { 1476 if (emsgp) 1477 *emsgp = (fl == O_WRONLY) ? 1478 "fd not open for reading" : 1479 "fd not open for writing"; 1480 return (-1); 1481 } 1482 return (fd); 1483 } 1484 1485 /* Called once from main */ 1486 void 1487 coproc_init(void) 1488 { 1489 coproc.read = coproc.readw = coproc.write = -1; 1490 coproc.njobs = 0; 1491 coproc.id = 0; 1492 } 1493 1494 /* Called by c_read() when eof is read - close fd if it is the co-process fd */ 1495 void 1496 coproc_read_close(int fd) 1497 { 1498 if (coproc.read >= 0 && fd == coproc.read) { 1499 coproc_readw_close(fd); 1500 close(coproc.read); 1501 coproc.read = -1; 1502 } 1503 } 1504 1505 /* 1506 * Called by c_read() and by iosetup() to close the other side of the 1507 * read pipe, so reads will actually terminate. 1508 */ 1509 void 1510 coproc_readw_close(int fd) 1511 { 1512 if (coproc.readw >= 0 && coproc.read >= 0 && fd == coproc.read) { 1513 close(coproc.readw); 1514 coproc.readw = -1; 1515 } 1516 } 1517 1518 /* 1519 * Called by c_print when a write to a fd fails with EPIPE and by iosetup 1520 * when co-process input is dup'd 1521 */ 1522 void 1523 coproc_write_close(int fd) 1524 { 1525 if (coproc.write >= 0 && fd == coproc.write) { 1526 close(coproc.write); 1527 coproc.write = -1; 1528 } 1529 } 1530 1531 /* 1532 * Called to check for existence of/value of the co-process file descriptor. 1533 * (Used by check_fd() and by c_read/c_print to deal with -p option). 1534 */ 1535 int 1536 coproc_getfd(int mode, const char **emsgp) 1537 { 1538 int fd = (mode & R_OK) ? coproc.read : coproc.write; 1539 1540 if (fd >= 0) 1541 return (fd); 1542 if (emsgp) 1543 *emsgp = "no coprocess"; 1544 return (-1); 1545 } 1546 1547 /* 1548 * called to close file descriptors related to the coprocess (if any) 1549 * Should be called with SIGCHLD blocked. 1550 */ 1551 void 1552 coproc_cleanup(int reuse) 1553 { 1554 /* This to allow co-processes to share output pipe */ 1555 if (!reuse || coproc.readw < 0 || coproc.read < 0) { 1556 if (coproc.read >= 0) { 1557 close(coproc.read); 1558 coproc.read = -1; 1559 } 1560 if (coproc.readw >= 0) { 1561 close(coproc.readw); 1562 coproc.readw = -1; 1563 } 1564 } 1565 if (coproc.write >= 0) { 1566 close(coproc.write); 1567 coproc.write = -1; 1568 } 1569 } 1570 1571 struct temp * 1572 maketemp(Area *ap, Temp_type type, struct temp **tlist) 1573 { 1574 char *cp; 1575 size_t len; 1576 int i, j; 1577 struct temp *tp; 1578 const char *dir; 1579 struct stat sb; 1580 1581 dir = tmpdir ? tmpdir : MKSH_DEFAULT_TMPDIR; 1582 /* add "/shXXXXXX.tmp" plus NUL */ 1583 len = strlen(dir); 1584 checkoktoadd(len, offsetof(struct temp, tffn[0]) + 14); 1585 tp = alloc(offsetof(struct temp, tffn[0]) + 14 + len, ap); 1586 1587 tp->shf = NULL; 1588 tp->pid = procpid; 1589 tp->type = type; 1590 1591 if (stat(dir, &sb) || !S_ISDIR(sb.st_mode)) { 1592 tp->tffn[0] = '\0'; 1593 goto maketemp_out; 1594 } 1595 1596 cp = (void *)tp; 1597 cp += offsetof(struct temp, tffn[0]); 1598 memcpy(cp, dir, len); 1599 cp += len; 1600 memcpy(cp, "/shXXXXXX.tmp", 14); 1601 /* point to the first of six Xes */ 1602 cp += 3; 1603 /* generate random part of filename */ 1604 len = -1; 1605 do { 1606 i = rndget() % 36; 1607 cp[++len] = i < 26 ? 'a' + i : '0' + i - 26; 1608 } while (len < 5); 1609 1610 /* cyclically attempt to open a temporary file */ 1611 while ((i = open(tp->tffn, O_CREAT | O_EXCL | O_RDWR | O_BINARY, 1612 0600)) < 0) { 1613 if (errno != EEXIST) 1614 goto maketemp_out; 1615 /* count down from z to a then from 9 to 0 */ 1616 while (cp[len] == '0') 1617 if (!len--) 1618 goto maketemp_out; 1619 if (cp[len] == 'a') 1620 cp[len] = '9'; 1621 else 1622 --cp[len]; 1623 /* do another cycle */ 1624 } 1625 1626 if (type == TT_FUNSUB) { 1627 /* map us high and mark as close-on-exec */ 1628 if ((j = savefd(i)) != i) { 1629 close(i); 1630 i = j; 1631 } 1632 1633 /* operation mode for the shf */ 1634 j = SHF_RD; 1635 } else 1636 j = SHF_WR; 1637 1638 /* shf_fdopen cannot fail, so no fd leak */ 1639 tp->shf = shf_fdopen(i, j, NULL); 1640 1641 maketemp_out: 1642 tp->next = *tlist; 1643 *tlist = tp; 1644 return (tp); 1645 } 1646 1647 /* 1648 * We use a similar collision resolution algorithm as Python 2.5.4 1649 * but with a slightly tweaked implementation written from scratch. 1650 */ 1651 1652 #define INIT_TBLSHIFT 3 /* initial table shift (2^3 = 8) */ 1653 #define PERTURB_SHIFT 5 /* see Python 2.5.4 Objects/dictobject.c */ 1654 1655 static void tgrow(struct table *); 1656 static int tnamecmp(const void *, const void *); 1657 1658 static void 1659 tgrow(struct table *tp) 1660 { 1661 size_t i, j, osize, mask, perturb; 1662 struct tbl *tblp, **pp; 1663 struct tbl **ntblp, **otblp = tp->tbls; 1664 1665 if (tp->tshift > 29) 1666 internal_errorf("hash table size limit reached"); 1667 1668 /* calculate old size, new shift and new size */ 1669 osize = (size_t)1 << (tp->tshift++); 1670 i = osize << 1; 1671 1672 ntblp = alloc2(i, sizeof(struct tbl *), tp->areap); 1673 /* multiplication cannot overflow: alloc2 checked that */ 1674 memset(ntblp, 0, i * sizeof(struct tbl *)); 1675 1676 /* table can get very full when reaching its size limit */ 1677 tp->nfree = (tp->tshift == 30) ? 0x3FFF0000UL : 1678 /* but otherwise, only 75% */ 1679 ((i * 3) / 4); 1680 tp->tbls = ntblp; 1681 if (otblp == NULL) 1682 return; 1683 1684 mask = i - 1; 1685 for (i = 0; i < osize; i++) 1686 if ((tblp = otblp[i]) != NULL) { 1687 if ((tblp->flag & DEFINED)) { 1688 /* search for free hash table slot */ 1689 j = perturb = tblp->ua.hval; 1690 goto find_first_empty_slot; 1691 find_next_empty_slot: 1692 j = (j << 2) + j + perturb + 1; 1693 perturb >>= PERTURB_SHIFT; 1694 find_first_empty_slot: 1695 pp = &ntblp[j & mask]; 1696 if (*pp != NULL) 1697 goto find_next_empty_slot; 1698 /* found an empty hash table slot */ 1699 *pp = tblp; 1700 tp->nfree--; 1701 } else if (!(tblp->flag & FINUSE)) { 1702 afree(tblp, tp->areap); 1703 } 1704 } 1705 afree(otblp, tp->areap); 1706 } 1707 1708 void 1709 ktinit(Area *ap, struct table *tp, uint8_t initshift) 1710 { 1711 tp->areap = ap; 1712 tp->tbls = NULL; 1713 tp->tshift = ((initshift > INIT_TBLSHIFT) ? 1714 initshift : INIT_TBLSHIFT) - 1; 1715 tgrow(tp); 1716 } 1717 1718 /* table, name (key) to search for, hash(name), rv pointer to tbl ptr */ 1719 struct tbl * 1720 ktscan(struct table *tp, const char *name, uint32_t h, struct tbl ***ppp) 1721 { 1722 size_t j, perturb, mask; 1723 struct tbl **pp, *p; 1724 1725 mask = ((size_t)1 << (tp->tshift)) - 1; 1726 /* search for hash table slot matching name */ 1727 j = perturb = h; 1728 goto find_first_slot; 1729 find_next_slot: 1730 j = (j << 2) + j + perturb + 1; 1731 perturb >>= PERTURB_SHIFT; 1732 find_first_slot: 1733 pp = &tp->tbls[j & mask]; 1734 if ((p = *pp) != NULL && (p->ua.hval != h || !(p->flag & DEFINED) || 1735 strcmp(p->name, name))) 1736 goto find_next_slot; 1737 /* p == NULL if not found, correct found entry otherwise */ 1738 if (ppp) 1739 *ppp = pp; 1740 return (p); 1741 } 1742 1743 /* table, name (key) to enter, hash(n) */ 1744 struct tbl * 1745 ktenter(struct table *tp, const char *n, uint32_t h) 1746 { 1747 struct tbl **pp, *p; 1748 size_t len; 1749 1750 Search: 1751 if ((p = ktscan(tp, n, h, &pp))) 1752 return (p); 1753 1754 if (tp->nfree == 0) { 1755 /* too full */ 1756 tgrow(tp); 1757 goto Search; 1758 } 1759 1760 /* create new tbl entry */ 1761 len = strlen(n); 1762 checkoktoadd(len, offsetof(struct tbl, name[0]) + 1); 1763 p = alloc(offsetof(struct tbl, name[0]) + ++len, tp->areap); 1764 p->flag = 0; 1765 p->type = 0; 1766 p->areap = tp->areap; 1767 p->ua.hval = h; 1768 p->u2.field = 0; 1769 p->u.array = NULL; 1770 memcpy(p->name, n, len); 1771 1772 /* enter in tp->tbls */ 1773 tp->nfree--; 1774 *pp = p; 1775 return (p); 1776 } 1777 1778 void 1779 ktwalk(struct tstate *ts, struct table *tp) 1780 { 1781 ts->left = (size_t)1 << (tp->tshift); 1782 ts->next = tp->tbls; 1783 } 1784 1785 struct tbl * 1786 ktnext(struct tstate *ts) 1787 { 1788 while (--ts->left >= 0) { 1789 struct tbl *p = *ts->next++; 1790 if (p != NULL && (p->flag & DEFINED)) 1791 return (p); 1792 } 1793 return (NULL); 1794 } 1795 1796 static int 1797 tnamecmp(const void *p1, const void *p2) 1798 { 1799 const struct tbl *a = *((const struct tbl * const *)p1); 1800 const struct tbl *b = *((const struct tbl * const *)p2); 1801 1802 return (strcmp(a->name, b->name)); 1803 } 1804 1805 struct tbl ** 1806 ktsort(struct table *tp) 1807 { 1808 size_t i; 1809 struct tbl **p, **sp, **dp; 1810 1811 /* 1812 * since the table is never entirely full, no need to reserve 1813 * additional space for the trailing NULL appended below 1814 */ 1815 i = (size_t)1 << (tp->tshift); 1816 p = alloc2(i, sizeof(struct tbl *), ATEMP); 1817 sp = tp->tbls; /* source */ 1818 dp = p; /* dest */ 1819 while (i--) 1820 if ((*dp = *sp++) != NULL && (((*dp)->flag & DEFINED) || 1821 ((*dp)->flag & ARRAY))) 1822 dp++; 1823 qsort(p, (i = dp - p), sizeof(struct tbl *), tnamecmp); 1824 p[i] = NULL; 1825 return (p); 1826 } 1827 1828 #ifdef SIGWINCH 1829 static void 1830 x_sigwinch(int sig MKSH_A_UNUSED) 1831 { 1832 /* this runs inside interrupt context, with errno saved */ 1833 1834 got_winch = 1; 1835 } 1836 #endif 1837 1838 #ifdef DF 1839 void 1840 DF(const char *fmt, ...) 1841 { 1842 va_list args; 1843 struct timeval tv; 1844 mirtime_mjd mjd; 1845 1846 mksh_lockfd(shl_dbg_fd); 1847 mksh_TIME(tv); 1848 timet2mjd(&mjd, tv.tv_sec); 1849 shf_fprintf(shl_dbg, "[%02u:%02u:%02u (%u) %u.%06u] ", 1850 (unsigned)mjd.sec / 3600, ((unsigned)mjd.sec / 60) % 60, 1851 (unsigned)mjd.sec % 60, (unsigned)getpid(), 1852 (unsigned)tv.tv_sec, (unsigned)tv.tv_usec); 1853 va_start(args, fmt); 1854 shf_vfprintf(shl_dbg, fmt, args); 1855 va_end(args); 1856 shf_putc('\n', shl_dbg); 1857 shf_flush(shl_dbg); 1858 mksh_unlkfd(shl_dbg_fd); 1859 } 1860 #endif 1861 1862 void 1863 x_mkraw(int fd, mksh_ttyst *ocb, bool forread) 1864 { 1865 mksh_ttyst cb; 1866 1867 if (ocb) 1868 mksh_tcget(fd, ocb); 1869 else 1870 ocb = &tty_state; 1871 1872 cb = *ocb; 1873 if (forread) { 1874 cb.c_iflag &= ~(ISTRIP); 1875 cb.c_lflag &= ~(ICANON) | ECHO; 1876 } else { 1877 cb.c_iflag &= ~(INLCR | ICRNL | ISTRIP); 1878 cb.c_lflag &= ~(ISIG | ICANON | ECHO); 1879 } 1880 #if defined(VLNEXT) && defined(_POSIX_VDISABLE) 1881 /* OSF/1 processes lnext when ~icanon */ 1882 cb.c_cc[VLNEXT] = _POSIX_VDISABLE; 1883 #endif 1884 /* SunOS 4.1.x & OSF/1 processes discard(flush) when ~icanon */ 1885 #if defined(VDISCARD) && defined(_POSIX_VDISABLE) 1886 cb.c_cc[VDISCARD] = _POSIX_VDISABLE; 1887 #endif 1888 cb.c_cc[VTIME] = 0; 1889 cb.c_cc[VMIN] = 1; 1890 1891 mksh_tcset(fd, &cb); 1892 } 1893
