1 /* $OpenBSD: main.c,v 1.55 2015/02/09 09:09:30 jsg 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, 2015 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 1.285.2.4 2015/04/19 19:18:20 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 * quitenv() may have reclaimed the memory 897 * used by source which will end badly when 898 * we jump to a function that expects it to 899 * be valid 900 */ 901 source = NULL; 902 } 903 } 904 } 905 906 void 907 newenv(int type) 908 { 909 struct env *ep; 910 char *cp; 911 912 /* 913 * struct env includes ALLOC_ITEM for alignment constraints 914 * so first get the actually used memory, then assign it 915 */ 916 cp = alloc(sizeof(struct env) - ALLOC_SIZE, ATEMP); 917 /* undo what alloc() did to the malloc result address */ 918 ep = (void *)(cp - ALLOC_SIZE); 919 /* initialise public members of struct env (not the ALLOC_ITEM) */ 920 ainit(&ep->area); 921 ep->oenv = e; 922 ep->loc = e->loc; 923 ep->savefd = NULL; 924 ep->temps = NULL; 925 ep->yyrecursive_statep = NULL; 926 ep->type = type; 927 ep->flags = 0; 928 /* jump buffer is invalid because flags == 0 */ 929 e = ep; 930 } 931 932 void 933 quitenv(struct shf *shf) 934 { 935 struct env *ep = e; 936 char *cp; 937 int fd; 938 939 yyrecursive_pop(true); 940 while (ep->oenv && ep->oenv->loc != ep->loc) 941 popblock(); 942 if (ep->savefd != NULL) { 943 for (fd = 0; fd < NUFILE; fd++) 944 /* if ep->savefd[fd] < 0, means fd was closed */ 945 if (ep->savefd[fd]) 946 restfd(fd, ep->savefd[fd]); 947 if (ep->savefd[2]) 948 /* Clear any write errors */ 949 shf_reopen(2, SHF_WR, shl_out); 950 } 951 /* 952 * Bottom of the stack. 953 * Either main shell is exiting or cleanup_parents_env() was called. 954 */ 955 if (ep->oenv == NULL) { 956 #ifdef DEBUG_LEAKS 957 int i; 958 #endif 959 960 if (ep->type == E_NONE) { 961 /* Main shell exiting? */ 962 #if HAVE_PERSISTENT_HISTORY 963 if (Flag(FTALKING)) 964 hist_finish(); 965 #endif 966 j_exit(); 967 if (ep->flags & EF_FAKE_SIGDIE) { 968 int sig = (exstat & 0xFF) - 128; 969 970 /* 971 * ham up our death a bit (AT&T ksh 972 * only seems to do this for SIGTERM) 973 * Don't do it for SIGQUIT, since we'd 974 * dump a core.. 975 */ 976 if ((sig == SIGINT || sig == SIGTERM) && 977 (kshpgrp == kshpid)) { 978 setsig(&sigtraps[sig], SIG_DFL, 979 SS_RESTORE_CURR | SS_FORCE); 980 kill(0, sig); 981 } 982 } 983 } 984 if (shf) 985 shf_close(shf); 986 reclaim(); 987 #ifdef DEBUG_LEAKS 988 #ifndef MKSH_NO_CMDLINE_EDITING 989 x_done(); 990 #endif 991 #ifndef MKSH_NOPROSPECTOFWORK 992 /* block at least SIGCHLD during/after afreeall */ 993 sigprocmask(SIG_BLOCK, &sm_sigchld, NULL); 994 #endif 995 afreeall(APERM); 996 for (fd = 3; fd < NUFILE; fd++) 997 if ((i = fcntl(fd, F_GETFD, 0)) != -1 && 998 (i & FD_CLOEXEC)) 999 close(fd); 1000 close(2); 1001 close(1); 1002 close(0); 1003 #endif 1004 exit(exstat & 0xFF); 1005 } 1006 if (shf) 1007 shf_close(shf); 1008 reclaim(); 1009 1010 e = e->oenv; 1011 1012 /* free the struct env - tricky due to the ALLOC_ITEM inside */ 1013 cp = (void *)ep; 1014 afree(cp + ALLOC_SIZE, ATEMP); 1015 } 1016 1017 /* Called after a fork to cleanup stuff left over from parents environment */ 1018 void 1019 cleanup_parents_env(void) 1020 { 1021 struct env *ep; 1022 int fd; 1023 1024 /* 1025 * Don't clean up temporary files - parent will probably need them. 1026 * Also, can't easily reclaim memory since variables, etc. could be 1027 * anywhere. 1028 */ 1029 1030 /* close all file descriptors hiding in savefd */ 1031 for (ep = e; ep; ep = ep->oenv) { 1032 if (ep->savefd) { 1033 for (fd = 0; fd < NUFILE; fd++) 1034 if (ep->savefd[fd] > 0) 1035 close(ep->savefd[fd]); 1036 afree(ep->savefd, &ep->area); 1037 ep->savefd = NULL; 1038 } 1039 #ifdef DEBUG_LEAKS 1040 if (ep->type != E_NONE) 1041 ep->type = E_GONE; 1042 #endif 1043 } 1044 #ifndef DEBUG_LEAKS 1045 e->oenv = NULL; 1046 #endif 1047 } 1048 1049 /* Called just before an execve cleanup stuff temporary files */ 1050 void 1051 cleanup_proc_env(void) 1052 { 1053 struct env *ep; 1054 1055 for (ep = e; ep; ep = ep->oenv) 1056 remove_temps(ep->temps); 1057 } 1058 1059 /* remove temp files and free ATEMP Area */ 1060 static void 1061 reclaim(void) 1062 { 1063 struct block *l; 1064 1065 while ((l = e->loc) && (!e->oenv || e->oenv->loc != l)) { 1066 e->loc = l->next; 1067 afreeall(&l->area); 1068 } 1069 1070 remove_temps(e->temps); 1071 e->temps = NULL; 1072 afreeall(&e->area); 1073 } 1074 1075 static void 1076 remove_temps(struct temp *tp) 1077 { 1078 for (; tp != NULL; tp = tp->next) 1079 if (tp->pid == procpid) 1080 unlink(tp->tffn); 1081 } 1082 1083 /* 1084 * Initialise tty_fd. Used for tracking the size of the terminal, 1085 * saving/resetting tty modes upon forground job completion, and 1086 * for setting up the tty process group. Return values: 1087 * 0 = got controlling tty 1088 * 1 = got terminal but no controlling tty 1089 * 2 = cannot find a terminal 1090 * 3 = cannot dup fd 1091 * 4 = cannot make fd close-on-exec 1092 * An existing tty_fd is cached if no "better" one could be found, 1093 * i.e. if tty_devtty was already set or the new would not set it. 1094 */ 1095 int 1096 tty_init_fd(void) 1097 { 1098 int fd, rv, eno = 0; 1099 bool do_close = false, is_devtty = true; 1100 1101 if (tty_devtty) { 1102 /* already got a tty which is /dev/tty */ 1103 return (0); 1104 } 1105 1106 #ifdef _UWIN 1107 /*XXX imake style */ 1108 if (isatty(3)) { 1109 /* fd 3 on UWIN _is_ /dev/tty (or our controlling tty) */ 1110 fd = 3; 1111 goto got_fd; 1112 } 1113 #endif 1114 if ((fd = open("/dev/tty", O_RDWR, 0)) >= 0) { 1115 do_close = true; 1116 goto got_fd; 1117 } 1118 eno = errno; 1119 1120 if (tty_fd >= 0) { 1121 /* already got a non-devtty one */ 1122 rv = 1; 1123 goto out; 1124 } 1125 is_devtty = false; 1126 1127 if (isatty((fd = 0)) || isatty((fd = 2))) 1128 goto got_fd; 1129 /* cannot find one */ 1130 rv = 2; 1131 /* assert: do_close == false */ 1132 goto out; 1133 1134 got_fd: 1135 if ((rv = fcntl(fd, F_DUPFD, FDBASE)) < 0) { 1136 eno = errno; 1137 rv = 3; 1138 goto out; 1139 } 1140 if (fcntl(rv, F_SETFD, FD_CLOEXEC) < 0) { 1141 eno = errno; 1142 close(rv); 1143 rv = 4; 1144 goto out; 1145 } 1146 tty_fd = rv; 1147 tty_devtty = is_devtty; 1148 rv = eno = 0; 1149 out: 1150 if (do_close) 1151 close(fd); 1152 errno = eno; 1153 return (rv); 1154 } 1155 1156 /* A shell error occurred (eg, syntax error, etc.) */ 1157 1158 #define VWARNINGF_ERRORPREFIX 1 1159 #define VWARNINGF_FILELINE 2 1160 #define VWARNINGF_BUILTIN 4 1161 #define VWARNINGF_INTERNAL 8 1162 1163 static void vwarningf(unsigned int, const char *, va_list) 1164 MKSH_A_FORMAT(__printf__, 2, 0); 1165 1166 static void 1167 vwarningf(unsigned int flags, const char *fmt, va_list ap) 1168 { 1169 if (fmt) { 1170 if (flags & VWARNINGF_INTERNAL) 1171 shf_fprintf(shl_out, "internal error: "); 1172 if (flags & VWARNINGF_ERRORPREFIX) 1173 error_prefix(tobool(flags & VWARNINGF_FILELINE)); 1174 if ((flags & VWARNINGF_BUILTIN) && 1175 /* not set when main() calls parse_args() */ 1176 builtin_argv0 && builtin_argv0 != kshname) 1177 shf_fprintf(shl_out, "%s: ", builtin_argv0); 1178 shf_vfprintf(shl_out, fmt, ap); 1179 shf_putchar('\n', shl_out); 1180 } 1181 shf_flush(shl_out); 1182 } 1183 1184 void 1185 errorfx(int rc, const char *fmt, ...) 1186 { 1187 va_list va; 1188 1189 exstat = rc; 1190 1191 /* debugging: note that stdout not valid */ 1192 shl_stdout_ok = false; 1193 1194 va_start(va, fmt); 1195 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va); 1196 va_end(va); 1197 unwind(LERROR); 1198 } 1199 1200 void 1201 errorf(const char *fmt, ...) 1202 { 1203 va_list va; 1204 1205 exstat = 1; 1206 1207 /* debugging: note that stdout not valid */ 1208 shl_stdout_ok = false; 1209 1210 va_start(va, fmt); 1211 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va); 1212 va_end(va); 1213 unwind(LERROR); 1214 } 1215 1216 /* like errorf(), but no unwind is done */ 1217 void 1218 warningf(bool fileline, const char *fmt, ...) 1219 { 1220 va_list va; 1221 1222 va_start(va, fmt); 1223 vwarningf(VWARNINGF_ERRORPREFIX | (fileline ? VWARNINGF_FILELINE : 0), 1224 fmt, va); 1225 va_end(va); 1226 } 1227 1228 /* 1229 * Used by built-in utilities to prefix shell and utility name to message 1230 * (also unwinds environments for special builtins). 1231 */ 1232 void 1233 bi_errorf(const char *fmt, ...) 1234 { 1235 va_list va; 1236 1237 /* debugging: note that stdout not valid */ 1238 shl_stdout_ok = false; 1239 1240 exstat = 1; 1241 1242 va_start(va, fmt); 1243 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE | 1244 VWARNINGF_BUILTIN, fmt, va); 1245 va_end(va); 1246 1247 /* 1248 * POSIX special builtins and ksh special builtins cause 1249 * non-interactive shells to exit. 1250 * XXX odd use of KEEPASN; also may not want LERROR here 1251 */ 1252 if (builtin_spec) { 1253 builtin_argv0 = NULL; 1254 unwind(LERROR); 1255 } 1256 } 1257 1258 /* Called when something that shouldn't happen does */ 1259 void 1260 internal_errorf(const char *fmt, ...) 1261 { 1262 va_list va; 1263 1264 va_start(va, fmt); 1265 vwarningf(VWARNINGF_INTERNAL, fmt, va); 1266 va_end(va); 1267 unwind(LERROR); 1268 } 1269 1270 void 1271 internal_warningf(const char *fmt, ...) 1272 { 1273 va_list va; 1274 1275 va_start(va, fmt); 1276 vwarningf(VWARNINGF_INTERNAL, fmt, va); 1277 va_end(va); 1278 } 1279 1280 /* used by error reporting functions to print "ksh: .kshrc[25]: " */ 1281 void 1282 error_prefix(bool fileline) 1283 { 1284 /* Avoid foo: foo[2]: ... */ 1285 if (!fileline || !source || !source->file || 1286 strcmp(source->file, kshname) != 0) 1287 shf_fprintf(shl_out, "%s: ", kshname + (*kshname == '-')); 1288 if (fileline && source && source->file != NULL) { 1289 shf_fprintf(shl_out, "%s[%lu]: ", source->file, 1290 (unsigned long)(source->errline ? 1291 source->errline : source->line)); 1292 source->errline = 0; 1293 } 1294 } 1295 1296 /* printf to shl_out (stderr) with flush */ 1297 void 1298 shellf(const char *fmt, ...) 1299 { 1300 va_list va; 1301 1302 if (!initio_done) 1303 /* shl_out may not be set up yet... */ 1304 return; 1305 va_start(va, fmt); 1306 shf_vfprintf(shl_out, fmt, va); 1307 va_end(va); 1308 shf_flush(shl_out); 1309 } 1310 1311 /* printf to shl_stdout (stdout) */ 1312 void 1313 shprintf(const char *fmt, ...) 1314 { 1315 va_list va; 1316 1317 if (!shl_stdout_ok) 1318 internal_errorf("shl_stdout not valid"); 1319 va_start(va, fmt); 1320 shf_vfprintf(shl_stdout, fmt, va); 1321 va_end(va); 1322 } 1323 1324 /* test if we can seek backwards fd (returns 0 or SHF_UNBUF) */ 1325 int 1326 can_seek(int fd) 1327 { 1328 struct stat statb; 1329 1330 return (fstat(fd, &statb) == 0 && !S_ISREG(statb.st_mode) ? 1331 SHF_UNBUF : 0); 1332 } 1333 1334 #ifdef DF 1335 int shl_dbg_fd; 1336 #define NSHF_IOB 4 1337 #else 1338 #define NSHF_IOB 3 1339 #endif 1340 struct shf shf_iob[NSHF_IOB]; 1341 1342 void 1343 initio(void) 1344 { 1345 #ifdef DF 1346 const char *lfp; 1347 #endif 1348 1349 /* force buffer allocation */ 1350 shf_fdopen(1, SHF_WR, shl_stdout); 1351 shf_fdopen(2, SHF_WR, shl_out); 1352 shf_fdopen(2, SHF_WR, shl_xtrace); 1353 #ifdef DF 1354 if ((lfp = getenv("SDMKSH_PATH")) == NULL) { 1355 if ((lfp = getenv("HOME")) == NULL || *lfp != '/') 1356 errorf("cannot get home directory"); 1357 lfp = shf_smprintf("%s/mksh-dbg.txt", lfp); 1358 } 1359 1360 if ((shl_dbg_fd = open(lfp, O_WRONLY | O_APPEND | O_CREAT, 0600)) < 0) 1361 errorf("cannot open debug output file %s", lfp); 1362 if (shl_dbg_fd < FDBASE) { 1363 int nfd; 1364 1365 nfd = fcntl(shl_dbg_fd, F_DUPFD, FDBASE); 1366 close(shl_dbg_fd); 1367 if ((shl_dbg_fd = nfd) == -1) 1368 errorf("cannot dup debug output file"); 1369 } 1370 fcntl(shl_dbg_fd, F_SETFD, FD_CLOEXEC); 1371 shf_fdopen(shl_dbg_fd, SHF_WR, shl_dbg); 1372 DF("=== open ==="); 1373 #endif 1374 initio_done = true; 1375 } 1376 1377 /* A dup2() with error checking */ 1378 int 1379 ksh_dup2(int ofd, int nfd, bool errok) 1380 { 1381 int rv; 1382 1383 if (((rv = dup2(ofd, nfd)) < 0) && !errok && (errno != EBADF)) 1384 errorf("too many files open in shell"); 1385 1386 #ifdef __ultrix 1387 /*XXX imake style */ 1388 if (rv >= 0) 1389 fcntl(nfd, F_SETFD, 0); 1390 #endif 1391 1392 return (rv); 1393 } 1394 1395 /* 1396 * Move fd from user space (0 <= fd < 10) to shell space (fd >= 10), 1397 * set close-on-exec flag. See FDBASE in sh.h, maybe 24 not 10 here. 1398 */ 1399 short 1400 savefd(int fd) 1401 { 1402 int nfd = fd; 1403 1404 if (fd < FDBASE && (nfd = fcntl(fd, F_DUPFD, FDBASE)) < 0 && 1405 errno == EBADF) 1406 return (-1); 1407 if (nfd < 0 || nfd > SHRT_MAX) 1408 errorf("too many files open in shell"); 1409 fcntl(nfd, F_SETFD, FD_CLOEXEC); 1410 return ((short)nfd); 1411 } 1412 1413 void 1414 restfd(int fd, int ofd) 1415 { 1416 if (fd == 2) 1417 shf_flush(&shf_iob[/* fd */ 2]); 1418 if (ofd < 0) 1419 /* original fd closed */ 1420 close(fd); 1421 else if (fd != ofd) { 1422 /*XXX: what to do if this dup fails? */ 1423 ksh_dup2(ofd, fd, true); 1424 close(ofd); 1425 } 1426 } 1427 1428 void 1429 openpipe(int *pv) 1430 { 1431 int lpv[2]; 1432 1433 if (pipe(lpv) < 0) 1434 errorf("can't create pipe - try again"); 1435 pv[0] = savefd(lpv[0]); 1436 if (pv[0] != lpv[0]) 1437 close(lpv[0]); 1438 pv[1] = savefd(lpv[1]); 1439 if (pv[1] != lpv[1]) 1440 close(lpv[1]); 1441 } 1442 1443 void 1444 closepipe(int *pv) 1445 { 1446 close(pv[0]); 1447 close(pv[1]); 1448 } 1449 1450 /* 1451 * Called by iosetup() (deals with 2>&4, etc.), c_read, c_print to turn 1452 * a string (the X in 2>&X, read -uX, print -uX) into a file descriptor. 1453 */ 1454 int 1455 check_fd(const char *name, int mode, const char **emsgp) 1456 { 1457 int fd = 0, fl; 1458 1459 if (name[0] == 'p' && !name[1]) 1460 return (coproc_getfd(mode, emsgp)); 1461 while (ksh_isdigit(*name)) { 1462 fd = (fd * 10) + *name - '0'; 1463 if (fd >= FDBASE) { 1464 if (emsgp) 1465 *emsgp = "file descriptor too large"; 1466 return (-1); 1467 } 1468 ++name; 1469 } 1470 if (*name) { 1471 if (emsgp) 1472 *emsgp = "illegal file descriptor name"; 1473 return (-1); 1474 } 1475 if ((fl = fcntl(fd, F_GETFL, 0)) < 0) { 1476 if (emsgp) 1477 *emsgp = "bad file descriptor"; 1478 return (-1); 1479 } 1480 fl &= O_ACCMODE; 1481 /* 1482 * X_OK is a kludge to disable this check for dups (x<&1): 1483 * historical shells never did this check (XXX don't know what 1484 * POSIX has to say). 1485 */ 1486 if (!(mode & X_OK) && fl != O_RDWR && ( 1487 ((mode & R_OK) && fl != O_RDONLY) || 1488 ((mode & W_OK) && fl != O_WRONLY))) { 1489 if (emsgp) 1490 *emsgp = (fl == O_WRONLY) ? 1491 "fd not open for reading" : 1492 "fd not open for writing"; 1493 return (-1); 1494 } 1495 return (fd); 1496 } 1497 1498 /* Called once from main */ 1499 void 1500 coproc_init(void) 1501 { 1502 coproc.read = coproc.readw = coproc.write = -1; 1503 coproc.njobs = 0; 1504 coproc.id = 0; 1505 } 1506 1507 /* Called by c_read() when eof is read - close fd if it is the co-process fd */ 1508 void 1509 coproc_read_close(int fd) 1510 { 1511 if (coproc.read >= 0 && fd == coproc.read) { 1512 coproc_readw_close(fd); 1513 close(coproc.read); 1514 coproc.read = -1; 1515 } 1516 } 1517 1518 /* 1519 * Called by c_read() and by iosetup() to close the other side of the 1520 * read pipe, so reads will actually terminate. 1521 */ 1522 void 1523 coproc_readw_close(int fd) 1524 { 1525 if (coproc.readw >= 0 && coproc.read >= 0 && fd == coproc.read) { 1526 close(coproc.readw); 1527 coproc.readw = -1; 1528 } 1529 } 1530 1531 /* 1532 * Called by c_print when a write to a fd fails with EPIPE and by iosetup 1533 * when co-process input is dup'd 1534 */ 1535 void 1536 coproc_write_close(int fd) 1537 { 1538 if (coproc.write >= 0 && fd == coproc.write) { 1539 close(coproc.write); 1540 coproc.write = -1; 1541 } 1542 } 1543 1544 /* 1545 * Called to check for existence of/value of the co-process file descriptor. 1546 * (Used by check_fd() and by c_read/c_print to deal with -p option). 1547 */ 1548 int 1549 coproc_getfd(int mode, const char **emsgp) 1550 { 1551 int fd = (mode & R_OK) ? coproc.read : coproc.write; 1552 1553 if (fd >= 0) 1554 return (fd); 1555 if (emsgp) 1556 *emsgp = "no coprocess"; 1557 return (-1); 1558 } 1559 1560 /* 1561 * called to close file descriptors related to the coprocess (if any) 1562 * Should be called with SIGCHLD blocked. 1563 */ 1564 void 1565 coproc_cleanup(int reuse) 1566 { 1567 /* This to allow co-processes to share output pipe */ 1568 if (!reuse || coproc.readw < 0 || coproc.read < 0) { 1569 if (coproc.read >= 0) { 1570 close(coproc.read); 1571 coproc.read = -1; 1572 } 1573 if (coproc.readw >= 0) { 1574 close(coproc.readw); 1575 coproc.readw = -1; 1576 } 1577 } 1578 if (coproc.write >= 0) { 1579 close(coproc.write); 1580 coproc.write = -1; 1581 } 1582 } 1583 1584 struct temp * 1585 maketemp(Area *ap, Temp_type type, struct temp **tlist) 1586 { 1587 char *cp; 1588 size_t len; 1589 int i, j; 1590 struct temp *tp; 1591 const char *dir; 1592 struct stat sb; 1593 1594 dir = tmpdir ? tmpdir : MKSH_DEFAULT_TMPDIR; 1595 /* add "/shXXXXXX.tmp" plus NUL */ 1596 len = strlen(dir); 1597 checkoktoadd(len, offsetof(struct temp, tffn[0]) + 14); 1598 tp = alloc(offsetof(struct temp, tffn[0]) + 14 + len, ap); 1599 1600 tp->shf = NULL; 1601 tp->pid = procpid; 1602 tp->type = type; 1603 1604 if (stat(dir, &sb) || !S_ISDIR(sb.st_mode)) { 1605 tp->tffn[0] = '\0'; 1606 goto maketemp_out; 1607 } 1608 1609 cp = (void *)tp; 1610 cp += offsetof(struct temp, tffn[0]); 1611 memcpy(cp, dir, len); 1612 cp += len; 1613 memcpy(cp, "/shXXXXXX.tmp", 14); 1614 /* point to the first of six Xes */ 1615 cp += 3; 1616 /* generate random part of filename */ 1617 len = -1; 1618 do { 1619 i = rndget() % 36; 1620 cp[++len] = i < 26 ? 'a' + i : '0' + i - 26; 1621 } while (len < 5); 1622 1623 /* cyclically attempt to open a temporary file */ 1624 while ((i = open(tp->tffn, O_CREAT | O_EXCL | O_RDWR | O_BINARY, 1625 0600)) < 0) { 1626 if (errno != EEXIST) 1627 goto maketemp_out; 1628 /* count down from z to a then from 9 to 0 */ 1629 while (cp[len] == '0') 1630 if (!len--) 1631 goto maketemp_out; 1632 if (cp[len] == 'a') 1633 cp[len] = '9'; 1634 else 1635 --cp[len]; 1636 /* do another cycle */ 1637 } 1638 1639 if (type == TT_FUNSUB) { 1640 /* map us high and mark as close-on-exec */ 1641 if ((j = savefd(i)) != i) { 1642 close(i); 1643 i = j; 1644 } 1645 1646 /* operation mode for the shf */ 1647 j = SHF_RD; 1648 } else 1649 j = SHF_WR; 1650 1651 /* shf_fdopen cannot fail, so no fd leak */ 1652 tp->shf = shf_fdopen(i, j, NULL); 1653 1654 maketemp_out: 1655 tp->next = *tlist; 1656 *tlist = tp; 1657 return (tp); 1658 } 1659 1660 /* 1661 * We use a similar collision resolution algorithm as Python 2.5.4 1662 * but with a slightly tweaked implementation written from scratch. 1663 */ 1664 1665 #define INIT_TBLSHIFT 3 /* initial table shift (2^3 = 8) */ 1666 #define PERTURB_SHIFT 5 /* see Python 2.5.4 Objects/dictobject.c */ 1667 1668 static void tgrow(struct table *); 1669 static int tnamecmp(const void *, const void *); 1670 1671 static void 1672 tgrow(struct table *tp) 1673 { 1674 size_t i, j, osize, mask, perturb; 1675 struct tbl *tblp, **pp; 1676 struct tbl **ntblp, **otblp = tp->tbls; 1677 1678 if (tp->tshift > 29) 1679 internal_errorf("hash table size limit reached"); 1680 1681 /* calculate old size, new shift and new size */ 1682 osize = (size_t)1 << (tp->tshift++); 1683 i = osize << 1; 1684 1685 ntblp = alloc2(i, sizeof(struct tbl *), tp->areap); 1686 /* multiplication cannot overflow: alloc2 checked that */ 1687 memset(ntblp, 0, i * sizeof(struct tbl *)); 1688 1689 /* table can get very full when reaching its size limit */ 1690 tp->nfree = (tp->tshift == 30) ? 0x3FFF0000UL : 1691 /* but otherwise, only 75% */ 1692 ((i * 3) / 4); 1693 tp->tbls = ntblp; 1694 if (otblp == NULL) 1695 return; 1696 1697 mask = i - 1; 1698 for (i = 0; i < osize; i++) 1699 if ((tblp = otblp[i]) != NULL) { 1700 if ((tblp->flag & DEFINED)) { 1701 /* search for free hash table slot */ 1702 j = perturb = tblp->ua.hval; 1703 goto find_first_empty_slot; 1704 find_next_empty_slot: 1705 j = (j << 2) + j + perturb + 1; 1706 perturb >>= PERTURB_SHIFT; 1707 find_first_empty_slot: 1708 pp = &ntblp[j & mask]; 1709 if (*pp != NULL) 1710 goto find_next_empty_slot; 1711 /* found an empty hash table slot */ 1712 *pp = tblp; 1713 tp->nfree--; 1714 } else if (!(tblp->flag & FINUSE)) { 1715 afree(tblp, tp->areap); 1716 } 1717 } 1718 afree(otblp, tp->areap); 1719 } 1720 1721 void 1722 ktinit(Area *ap, struct table *tp, uint8_t initshift) 1723 { 1724 tp->areap = ap; 1725 tp->tbls = NULL; 1726 tp->tshift = ((initshift > INIT_TBLSHIFT) ? 1727 initshift : INIT_TBLSHIFT) - 1; 1728 tgrow(tp); 1729 } 1730 1731 /* table, name (key) to search for, hash(name), rv pointer to tbl ptr */ 1732 struct tbl * 1733 ktscan(struct table *tp, const char *name, uint32_t h, struct tbl ***ppp) 1734 { 1735 size_t j, perturb, mask; 1736 struct tbl **pp, *p; 1737 1738 mask = ((size_t)1 << (tp->tshift)) - 1; 1739 /* search for hash table slot matching name */ 1740 j = perturb = h; 1741 goto find_first_slot; 1742 find_next_slot: 1743 j = (j << 2) + j + perturb + 1; 1744 perturb >>= PERTURB_SHIFT; 1745 find_first_slot: 1746 pp = &tp->tbls[j & mask]; 1747 if ((p = *pp) != NULL && (p->ua.hval != h || !(p->flag & DEFINED) || 1748 strcmp(p->name, name))) 1749 goto find_next_slot; 1750 /* p == NULL if not found, correct found entry otherwise */ 1751 if (ppp) 1752 *ppp = pp; 1753 return (p); 1754 } 1755 1756 /* table, name (key) to enter, hash(n) */ 1757 struct tbl * 1758 ktenter(struct table *tp, const char *n, uint32_t h) 1759 { 1760 struct tbl **pp, *p; 1761 size_t len; 1762 1763 Search: 1764 if ((p = ktscan(tp, n, h, &pp))) 1765 return (p); 1766 1767 if (tp->nfree == 0) { 1768 /* too full */ 1769 tgrow(tp); 1770 goto Search; 1771 } 1772 1773 /* create new tbl entry */ 1774 len = strlen(n); 1775 checkoktoadd(len, offsetof(struct tbl, name[0]) + 1); 1776 p = alloc(offsetof(struct tbl, name[0]) + ++len, tp->areap); 1777 p->flag = 0; 1778 p->type = 0; 1779 p->areap = tp->areap; 1780 p->ua.hval = h; 1781 p->u2.field = 0; 1782 p->u.array = NULL; 1783 memcpy(p->name, n, len); 1784 1785 /* enter in tp->tbls */ 1786 tp->nfree--; 1787 *pp = p; 1788 return (p); 1789 } 1790 1791 void 1792 ktwalk(struct tstate *ts, struct table *tp) 1793 { 1794 ts->left = (size_t)1 << (tp->tshift); 1795 ts->next = tp->tbls; 1796 } 1797 1798 struct tbl * 1799 ktnext(struct tstate *ts) 1800 { 1801 while (--ts->left >= 0) { 1802 struct tbl *p = *ts->next++; 1803 if (p != NULL && (p->flag & DEFINED)) 1804 return (p); 1805 } 1806 return (NULL); 1807 } 1808 1809 static int 1810 tnamecmp(const void *p1, const void *p2) 1811 { 1812 const struct tbl *a = *((const struct tbl * const *)p1); 1813 const struct tbl *b = *((const struct tbl * const *)p2); 1814 1815 return (strcmp(a->name, b->name)); 1816 } 1817 1818 struct tbl ** 1819 ktsort(struct table *tp) 1820 { 1821 size_t i; 1822 struct tbl **p, **sp, **dp; 1823 1824 /* 1825 * since the table is never entirely full, no need to reserve 1826 * additional space for the trailing NULL appended below 1827 */ 1828 i = (size_t)1 << (tp->tshift); 1829 p = alloc2(i, sizeof(struct tbl *), ATEMP); 1830 sp = tp->tbls; /* source */ 1831 dp = p; /* dest */ 1832 while (i--) 1833 if ((*dp = *sp++) != NULL && (((*dp)->flag & DEFINED) || 1834 ((*dp)->flag & ARRAY))) 1835 dp++; 1836 qsort(p, (i = dp - p), sizeof(struct tbl *), tnamecmp); 1837 p[i] = NULL; 1838 return (p); 1839 } 1840 1841 #ifdef SIGWINCH 1842 static void 1843 x_sigwinch(int sig MKSH_A_UNUSED) 1844 { 1845 /* this runs inside interrupt context, with errno saved */ 1846 1847 got_winch = 1; 1848 } 1849 #endif 1850 1851 #ifdef DF 1852 void 1853 DF(const char *fmt, ...) 1854 { 1855 va_list args; 1856 struct timeval tv; 1857 mirtime_mjd mjd; 1858 1859 mksh_lockfd(shl_dbg_fd); 1860 mksh_TIME(tv); 1861 timet2mjd(&mjd, tv.tv_sec); 1862 shf_fprintf(shl_dbg, "[%02u:%02u:%02u (%u) %u.%06u] ", 1863 (unsigned)mjd.sec / 3600, ((unsigned)mjd.sec / 60) % 60, 1864 (unsigned)mjd.sec % 60, (unsigned)getpid(), 1865 (unsigned)tv.tv_sec, (unsigned)tv.tv_usec); 1866 va_start(args, fmt); 1867 shf_vfprintf(shl_dbg, fmt, args); 1868 va_end(args); 1869 shf_putc('\n', shl_dbg); 1870 shf_flush(shl_dbg); 1871 mksh_unlkfd(shl_dbg_fd); 1872 } 1873 #endif 1874 1875 void 1876 x_mkraw(int fd, mksh_ttyst *ocb, bool forread) 1877 { 1878 mksh_ttyst cb; 1879 1880 if (ocb) 1881 mksh_tcget(fd, ocb); 1882 else 1883 ocb = &tty_state; 1884 1885 cb = *ocb; 1886 if (forread) { 1887 cb.c_iflag &= ~(ISTRIP); 1888 cb.c_lflag &= ~(ICANON) | ECHO; 1889 } else { 1890 cb.c_iflag &= ~(INLCR | ICRNL | ISTRIP); 1891 cb.c_lflag &= ~(ISIG | ICANON | ECHO); 1892 } 1893 #if defined(VLNEXT) && defined(_POSIX_VDISABLE) 1894 /* OSF/1 processes lnext when ~icanon */ 1895 cb.c_cc[VLNEXT] = _POSIX_VDISABLE; 1896 #endif 1897 /* SunOS 4.1.x & OSF/1 processes discard(flush) when ~icanon */ 1898 #if defined(VDISCARD) && defined(_POSIX_VDISABLE) 1899 cb.c_cc[VDISCARD] = _POSIX_VDISABLE; 1900 #endif 1901 cb.c_cc[VTIME] = 0; 1902 cb.c_cc[VMIN] = 1; 1903 1904 mksh_tcset(fd, &cb); 1905 } 1906
