1 /* $OpenBSD: main.c,v 1.57 2015/09/10 22:48:58 nicm Exp $ */ 2 /* $OpenBSD: tty.c,v 1.10 2014/08/10 02:44:26 guenther Exp $ */ 3 /* $OpenBSD: io.c,v 1.26 2015/09/11 08:00:27 guenther Exp $ */ 4 /* $OpenBSD: table.c,v 1.16 2015/09/01 13:12:31 tedu Exp $ */ 5 6 /*- 7 * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 8 * 2011, 2012, 2013, 2014, 2015, 2016, 2017 9 * mirabilos <m (at) mirbsd.org> 10 * 11 * Provided that these terms and disclaimer and all copyright notices 12 * are retained or reproduced in an accompanying document, permission 13 * is granted to deal in this work without restriction, including un- 14 * limited rights to use, publicly perform, distribute, sell, modify, 15 * merge, give away, or sublicence. 16 * 17 * This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to 18 * the utmost extent permitted by applicable law, neither express nor 19 * implied; without malicious intent or gross negligence. In no event 20 * may a licensor, author or contributor be held liable for indirect, 21 * direct, other damage, loss, or other issues arising in any way out 22 * of dealing in the work, even if advised of the possibility of such 23 * damage or existence of a defect, except proven that it results out 24 * of said person's immediate fault when using the work as intended. 25 */ 26 27 #define EXTERN 28 #include "sh.h" 29 30 #if HAVE_LANGINFO_CODESET 31 #include <langinfo.h> 32 #endif 33 #if HAVE_SETLOCALE_CTYPE 34 #include <locale.h> 35 #endif 36 37 __RCSID("$MirOS: src/bin/mksh/main.c,v 1.332 2017/04/12 16:01:45 tg Exp $"); 38 39 extern char **environ; 40 41 #ifndef MKSHRC_PATH 42 #define MKSHRC_PATH "~/.mkshrc" 43 #endif 44 45 #ifndef MKSH_DEFAULT_TMPDIR 46 #define MKSH_DEFAULT_TMPDIR MKSH_UNIXROOT "/tmp" 47 #endif 48 49 static uint8_t isuc(const char *); 50 static int main_init(int, const char *[], Source **, struct block **); 51 void chvt_reinit(void); 52 static void reclaim(void); 53 static void remove_temps(struct temp *); 54 static mksh_uari_t rndsetup(void); 55 #ifdef SIGWINCH 56 static void x_sigwinch(int); 57 #endif 58 59 static const char initsubs[] = 60 "${PS2=> }" 61 "${PS3=#? }" 62 "${PS4=+ }" 63 "${SECONDS=0}" 64 "${TMOUT=0}" 65 "${EPOCHREALTIME=}"; 66 67 static const char *initcoms[] = { 68 Ttypeset, "-r", initvsn, NULL, 69 Ttypeset, "-x", "HOME", TPATH, TSHELL, NULL, 70 Ttypeset, "-i10", "COLUMNS", "LINES", "SECONDS", "TMOUT", NULL, 71 Talias, 72 "integer=\\\\builtin typeset -i", 73 "local=\\\\builtin typeset", 74 /* not "alias -t --": hash -r needs to work */ 75 "hash=\\\\builtin alias -t", 76 "type=\\\\builtin whence -v", 77 "autoload=\\\\builtin typeset -fu", 78 "functions=\\\\builtin typeset -f", 79 "history=\\\\builtin fc -l", 80 "nameref=\\\\builtin typeset -n", 81 "nohup=nohup ", 82 "r=\\\\builtin fc -e -", 83 "login=\\\\builtin exec login", 84 NULL, 85 /* this is what AT&T ksh seems to track, with the addition of emacs */ 86 Talias, "-tU", 87 Tcat, "cc", "chmod", "cp", "date", "ed", "emacs", "grep", "ls", 88 "make", "mv", "pr", "rm", "sed", Tsh, "vi", "who", NULL, 89 NULL 90 }; 91 92 static const char *restr_com[] = { 93 Ttypeset, "-r", TPATH, "ENV", TSHELL, NULL 94 }; 95 96 static bool initio_done; 97 98 /* top-level parsing and execution environment */ 99 static struct env env; 100 struct env *e = &env; 101 102 /* compile-time assertions */ 103 #define cta(name, expr) struct cta_ ## name { char t[(expr) ? 1 : -1]; } 104 105 /* this one should be defined by the standard */ 106 cta(char_is_1_char, (sizeof(char) == 1) && (sizeof(signed char) == 1) && 107 (sizeof(unsigned char) == 1)); 108 cta(char_is_8_bits, ((CHAR_BIT) == 8) && ((int)(unsigned char)0xFF == 0xFF) && 109 ((int)(unsigned char)0x100 == 0) && ((int)(unsigned char)(int)-1 == 0xFF)); 110 /* the next assertion is probably not really needed */ 111 cta(short_is_2_char, sizeof(short) == 2); 112 cta(short_size_no_matter_of_signedness, sizeof(short) == sizeof(unsigned short)); 113 /* the next assertion is probably not really needed */ 114 cta(int_is_4_char, sizeof(int) == 4); 115 cta(int_size_no_matter_of_signedness, sizeof(int) == sizeof(unsigned int)); 116 117 cta(long_ge_int, sizeof(long) >= sizeof(int)); 118 cta(long_size_no_matter_of_signedness, sizeof(long) == sizeof(unsigned long)); 119 120 #ifndef MKSH_LEGACY_MODE 121 /* the next assertion is probably not really needed */ 122 cta(ari_is_4_char, sizeof(mksh_ari_t) == 4); 123 /* but this is */ 124 cta(ari_has_31_bit, 0 < (mksh_ari_t)(((((mksh_ari_t)1 << 15) << 15) - 1) * 2 + 1)); 125 /* the next assertion is probably not really needed */ 126 cta(uari_is_4_char, sizeof(mksh_uari_t) == 4); 127 /* but the next three are; we REQUIRE unsigned integer wraparound */ 128 cta(uari_has_31_bit, 0 < (mksh_uari_t)(((((mksh_uari_t)1 << 15) << 15) - 1) * 2 + 1)); 129 cta(uari_has_32_bit, 0 < (mksh_uari_t)(((((mksh_uari_t)1 << 15) << 15) - 1) * 4 + 3)); 130 cta(uari_wrap_32_bit, 131 (mksh_uari_t)(((((mksh_uari_t)1 << 15) << 15) - 1) * 4 + 3) > 132 (mksh_uari_t)(((((mksh_uari_t)1 << 15) << 15) - 1) * 4 + 4)); 133 #endif 134 /* these are always required */ 135 cta(ari_is_signed, (mksh_ari_t)-1 < (mksh_ari_t)0); 136 cta(uari_is_unsigned, (mksh_uari_t)-1 > (mksh_uari_t)0); 137 /* we require these to have the precisely same size and assume 2s complement */ 138 cta(ari_size_no_matter_of_signedness, sizeof(mksh_ari_t) == sizeof(mksh_uari_t)); 139 140 cta(sizet_size_no_matter_of_signedness, sizeof(ssize_t) == sizeof(size_t)); 141 cta(sizet_voidptr_same_size, sizeof(size_t) == sizeof(void *)); 142 cta(sizet_funcptr_same_size, sizeof(size_t) == sizeof(void (*)(void))); 143 /* our formatting routines assume this */ 144 cta(ptr_fits_in_long, sizeof(size_t) <= sizeof(long)); 145 cta(ari_fits_in_long, sizeof(mksh_ari_t) <= sizeof(long)); 146 147 static mksh_uari_t 148 rndsetup(void) 149 { 150 register uint32_t h; 151 struct { 152 ALLOC_ITEM alloc_INT; 153 void *dataptr, *stkptr, *mallocptr; 154 #if defined(__GLIBC__) && (__GLIBC__ >= 2) 155 sigjmp_buf jbuf; 156 #endif 157 struct timeval tv; 158 } *bufptr; 159 char *cp; 160 161 cp = alloc(sizeof(*bufptr) - sizeof(ALLOC_ITEM), APERM); 162 /* clear the allocated space, for valgrind and to avoid UB */ 163 memset(cp, 0, sizeof(*bufptr) - sizeof(ALLOC_ITEM)); 164 /* undo what alloc() did to the malloc result address */ 165 bufptr = (void *)(cp - sizeof(ALLOC_ITEM)); 166 /* PIE or something similar provides us with deltas here */ 167 bufptr->dataptr = &rndsetupstate; 168 /* ASLR in at least Windows, Linux, some BSDs */ 169 bufptr->stkptr = &bufptr; 170 /* randomised malloc in BSD (and possibly others) */ 171 bufptr->mallocptr = bufptr; 172 #if defined(__GLIBC__) && (__GLIBC__ >= 2) 173 /* glibc pointer guard */ 174 sigsetjmp(bufptr->jbuf, 1); 175 #endif 176 /* introduce variation (and yes, second arg MBZ for portability) */ 177 mksh_TIME(bufptr->tv); 178 179 #ifdef MKSH_ALLOC_CATCH_UNDERRUNS 180 mprotect(((char *)bufptr) + 4096, 4096, PROT_READ | PROT_WRITE); 181 #endif 182 h = chvt_rndsetup(bufptr, sizeof(*bufptr)); 183 184 afree(cp, APERM); 185 return ((mksh_uari_t)h); 186 } 187 188 void 189 chvt_reinit(void) 190 { 191 kshpid = procpid = getpid(); 192 ksheuid = geteuid(); 193 kshpgrp = getpgrp(); 194 kshppid = getppid(); 195 } 196 197 static const char *empty_argv[] = { 198 Tmksh, NULL 199 }; 200 201 static uint8_t 202 isuc(const char *cx) { 203 char *cp, *x; 204 uint8_t rv = 0; 205 206 if (!cx || !*cx) 207 return (0); 208 209 /* uppercase a string duplicate */ 210 strdupx(x, cx, ATEMP); 211 cp = x; 212 while ((*cp = ksh_toupper(*cp))) 213 ++cp; 214 215 /* check for UTF-8 */ 216 if (strstr(x, "UTF-8") || strstr(x, "UTF8")) 217 rv = 1; 218 219 /* free copy and out */ 220 afree(x, ATEMP); 221 return (rv); 222 } 223 224 static int 225 main_init(int argc, const char *argv[], Source **sp, struct block **lp) 226 { 227 int argi, i; 228 Source *s = NULL; 229 struct block *l; 230 unsigned char restricted_shell, errexit, utf_flag; 231 char *cp; 232 const char *ccp, **wp; 233 struct tbl *vp; 234 struct stat s_stdin; 235 #if !defined(_PATH_DEFPATH) && defined(_CS_PATH) 236 ssize_t k; 237 #endif 238 239 #ifdef __OS2__ 240 for (i = 0; i < 3; ++i) 241 if (!isatty(i)) 242 setmode(i, O_BINARY); 243 244 os2_init(&argc, &argv); 245 #endif 246 247 /* do things like getpgrp() et al. */ 248 chvt_reinit(); 249 250 /* make sure argv[] is sane, for weird OSes */ 251 if (!*argv) { 252 argv = empty_argv; 253 argc = 1; 254 } 255 kshname = argv[0]; 256 257 /* initialise permanent Area */ 258 ainit(&aperm); 259 /* max. name length: -2147483648 = 11 (+ NUL) */ 260 vtemp = alloc(offsetof(struct tbl, name[0]) + 12, APERM); 261 262 /* set up base environment */ 263 env.type = E_NONE; 264 ainit(&env.area); 265 /* set up global l->vars and l->funs */ 266 newblock(); 267 268 /* Do this first so output routines (eg, errorf, shellf) can work */ 269 initio(); 270 271 /* determine the basename (without '-' or path) of the executable */ 272 ccp = kshname; 273 goto begin_parsing_kshname; 274 while ((i = ccp[argi++])) { 275 if (mksh_cdirsep(i)) { 276 ccp += argi; 277 begin_parsing_kshname: 278 argi = 0; 279 if (*ccp == '-') 280 ++ccp; 281 } 282 } 283 if (!*ccp) 284 ccp = empty_argv[0]; 285 286 /* 287 * Turn on nohup by default. (AT&T ksh does not have a nohup 288 * option - it always sends the hup). 289 */ 290 Flag(FNOHUP) = 1; 291 292 /* 293 * Turn on brace expansion by default. AT&T kshs that have 294 * alternation always have it on. 295 */ 296 Flag(FBRACEEXPAND) = 1; 297 298 /* 299 * Turn on "set -x" inheritance by default. 300 */ 301 Flag(FXTRACEREC) = 1; 302 303 /* define built-in commands and see if we were called as one */ 304 ktinit(APERM, &builtins, 305 /* currently up to 54 builtins: 75% of 128 = 2^7 */ 306 7); 307 for (i = 0; mkshbuiltins[i].name != NULL; i++) 308 if (!strcmp(ccp, builtin(mkshbuiltins[i].name, 309 mkshbuiltins[i].func))) 310 Flag(FAS_BUILTIN) = 1; 311 312 if (!Flag(FAS_BUILTIN)) { 313 /* check for -T option early */ 314 argi = parse_args(argv, OF_FIRSTTIME, NULL); 315 if (argi < 0) 316 return (1); 317 318 #if defined(MKSH_BINSHPOSIX) || defined(MKSH_BINSHREDUCED) 319 /* are we called as -sh or /bin/sh or so? */ 320 if (!strcmp(ccp, "sh" MKSH_EXE_EXT)) { 321 /* either also turns off braceexpand */ 322 #ifdef MKSH_BINSHPOSIX 323 /* enable better POSIX conformance */ 324 change_flag(FPOSIX, OF_FIRSTTIME, true); 325 #endif 326 #ifdef MKSH_BINSHREDUCED 327 /* enable kludge/compat mode */ 328 change_flag(FSH, OF_FIRSTTIME, true); 329 #endif 330 } 331 #endif 332 } 333 334 initvar(); 335 336 initctypes(); 337 338 inittraps(); 339 340 coproc_init(); 341 342 /* set up variable and command dictionaries */ 343 ktinit(APERM, &taliases, 0); 344 ktinit(APERM, &aliases, 0); 345 #ifndef MKSH_NOPWNAM 346 ktinit(APERM, &homedirs, 0); 347 #endif 348 349 /* define shell keywords */ 350 initkeywords(); 351 352 init_histvec(); 353 354 /* initialise tty size before importing environment */ 355 change_winsz(); 356 357 #ifdef _PATH_DEFPATH 358 def_path = _PATH_DEFPATH; 359 #else 360 #ifdef _CS_PATH 361 if ((k = confstr(_CS_PATH, NULL, 0)) > 0 && 362 confstr(_CS_PATH, cp = alloc(k + 1, APERM), k + 1) == k + 1) 363 def_path = cp; 364 else 365 #endif 366 /* 367 * this is uniform across all OSes unless it 368 * breaks somewhere hard; don't try to optimise, 369 * e.g. add stuff for Interix or remove /usr 370 * for HURD, because e.g. Debian GNU/HURD is 371 * "keeping a regular /usr"; this is supposed 372 * to be a sane 'basic' default PATH 373 */ 374 def_path = MKSH_UNIXROOT "/bin" MKSH_PATHSEPS 375 MKSH_UNIXROOT "/usr/bin" MKSH_PATHSEPS 376 MKSH_UNIXROOT "/sbin" MKSH_PATHSEPS 377 MKSH_UNIXROOT "/usr/sbin"; 378 #endif 379 380 /* 381 * Set PATH to def_path (will set the path global variable). 382 * (import of environment below will probably change this setting). 383 */ 384 vp = global(TPATH); 385 /* setstr can't fail here */ 386 setstr(vp, def_path, KSH_RETURN_ERROR); 387 388 #ifndef MKSH_NO_CMDLINE_EDITING 389 /* 390 * Set edit mode to emacs by default, may be overridden 391 * by the environment or the user. Also, we want tab completion 392 * on in vi by default. 393 */ 394 change_flag(FEMACS, OF_SPECIAL, true); 395 #if !MKSH_S_NOVI 396 Flag(FVITABCOMPLETE) = 1; 397 #endif 398 #endif 399 400 /* import environment */ 401 if (environ != NULL) { 402 wp = (const char **)environ; 403 while (*wp != NULL) { 404 rndpush(*wp); 405 typeset(*wp, IMPORT | EXPORT, 0, 0, 0); 406 ++wp; 407 } 408 } 409 410 /* override default PATH regardless of environment */ 411 #ifdef MKSH_DEFPATH_OVERRIDE 412 vp = global(TPATH); 413 setstr(vp, MKSH_DEFPATH_OVERRIDE, KSH_RETURN_ERROR); 414 #endif 415 416 /* for security */ 417 typeset("IFS= \t\n", 0, 0, 0, 0); 418 419 /* assign default shell variable values */ 420 typeset("PATHSEP=" MKSH_PATHSEPS, 0, 0, 0, 0); 421 substitute(initsubs, 0); 422 423 /* Figure out the current working directory and set $PWD */ 424 vp = global(TPWD); 425 cp = str_val(vp); 426 /* Try to use existing $PWD if it is valid */ 427 set_current_wd((mksh_abspath(cp) && test_eval(NULL, TO_FILEQ, cp, 428 Tdot, true)) ? cp : NULL); 429 if (current_wd[0]) 430 simplify_path(current_wd); 431 /* Only set pwd if we know where we are or if it had a bogus value */ 432 if (current_wd[0] || *cp) 433 /* setstr can't fail here */ 434 setstr(vp, current_wd, KSH_RETURN_ERROR); 435 436 for (wp = initcoms; *wp != NULL; wp++) { 437 c_builtin(wp); 438 while (*wp != NULL) 439 wp++; 440 } 441 setint_n(global("OPTIND"), 1, 10); 442 443 kshuid = getuid(); 444 kshgid = getgid(); 445 kshegid = getegid(); 446 447 safe_prompt = ksheuid ? "$ " : "# "; 448 vp = global("PS1"); 449 /* Set PS1 if unset or we are root and prompt doesn't contain a # */ 450 if (!(vp->flag & ISSET) || 451 (!ksheuid && !strchr(str_val(vp), '#'))) 452 /* setstr can't fail here */ 453 setstr(vp, safe_prompt, KSH_RETURN_ERROR); 454 setint_n((vp = global("BASHPID")), 0, 10); 455 vp->flag |= INT_U; 456 setint_n((vp = global("PGRP")), (mksh_uari_t)kshpgrp, 10); 457 vp->flag |= INT_U; 458 setint_n((vp = global("PPID")), (mksh_uari_t)kshppid, 10); 459 vp->flag |= INT_U; 460 setint_n((vp = global("USER_ID")), (mksh_uari_t)ksheuid, 10); 461 vp->flag |= INT_U; 462 setint_n((vp = global("KSHUID")), (mksh_uari_t)kshuid, 10); 463 vp->flag |= INT_U; 464 setint_n((vp = global("KSHEGID")), (mksh_uari_t)kshegid, 10); 465 vp->flag |= INT_U; 466 setint_n((vp = global("KSHGID")), (mksh_uari_t)kshgid, 10); 467 vp->flag |= INT_U; 468 setint_n((vp = global("RANDOM")), rndsetup(), 10); 469 vp->flag |= INT_U; 470 setint_n((vp_pipest = global("PIPESTATUS")), 0, 10); 471 472 /* Set this before parsing arguments */ 473 Flag(FPRIVILEGED) = (kshuid != ksheuid || kshgid != kshegid) ? 2 : 0; 474 475 /* this to note if monitor is set on command line (see below) */ 476 #ifndef MKSH_UNEMPLOYED 477 Flag(FMONITOR) = 127; 478 #endif 479 /* this to note if utf-8 mode is set on command line (see below) */ 480 UTFMODE = 2; 481 482 if (!Flag(FAS_BUILTIN)) { 483 argi = parse_args(argv, OF_CMDLINE, NULL); 484 if (argi < 0) 485 return (1); 486 } 487 488 /* process this later only, default to off (hysterical raisins) */ 489 utf_flag = UTFMODE; 490 UTFMODE = 0; 491 492 if (Flag(FAS_BUILTIN)) { 493 /* auto-detect from environment variables, always */ 494 utf_flag = 3; 495 } else if (Flag(FCOMMAND)) { 496 s = pushs(SSTRINGCMDLINE, ATEMP); 497 if (!(s->start = s->str = argv[argi++])) 498 errorf(Tf_optfoo, "", "", 'c', Treq_arg); 499 while (*s->str) { 500 if (*s->str != ' ' && ctype(*s->str, C_QUOTE)) 501 break; 502 s->str++; 503 } 504 if (!*s->str) 505 s->flags |= SF_MAYEXEC; 506 s->str = s->start; 507 #ifdef MKSH_MIDNIGHTBSD01ASH_COMPAT 508 /* compatibility to MidnightBSD 0.1 /bin/sh (kludge) */ 509 if (Flag(FSH) && argv[argi] && !strcmp(argv[argi], "--")) 510 ++argi; 511 #endif 512 if (argv[argi]) 513 kshname = argv[argi++]; 514 } else if (argi < argc && !Flag(FSTDIN)) { 515 s = pushs(SFILE, ATEMP); 516 #ifdef __OS2__ 517 /* 518 * A bug in OS/2 extproc (like shebang) handling makes 519 * it not pass the full pathname of a script, so we need 520 * to search for it. This changes the behaviour of a 521 * simple "mksh foo", but can't be helped. 522 */ 523 s->file = argv[argi++]; 524 if (search_access(s->file, X_OK) != 0) 525 s->file = search_path(s->file, path, X_OK, NULL); 526 if (!s->file || !*s->file) 527 s->file = argv[argi - 1]; 528 #else 529 s->file = argv[argi++]; 530 #endif 531 s->u.shf = shf_open(s->file, O_RDONLY, 0, 532 SHF_MAPHI | SHF_CLEXEC); 533 if (s->u.shf == NULL) { 534 shl_stdout_ok = false; 535 warningf(true, Tf_sD_s, s->file, cstrerror(errno)); 536 /* mandated by SUSv4 */ 537 exstat = 127; 538 unwind(LERROR); 539 } 540 kshname = s->file; 541 } else { 542 Flag(FSTDIN) = 1; 543 s = pushs(SSTDIN, ATEMP); 544 s->file = "<stdin>"; 545 s->u.shf = shf_fdopen(0, SHF_RD | can_seek(0), 546 NULL); 547 if (isatty(0) && isatty(2)) { 548 Flag(FTALKING) = Flag(FTALKING_I) = 1; 549 /* The following only if isatty(0) */ 550 s->flags |= SF_TTY; 551 s->u.shf->flags |= SHF_INTERRUPT; 552 s->file = NULL; 553 } 554 } 555 556 /* this bizarreness is mandated by POSIX */ 557 if (fstat(0, &s_stdin) >= 0 && S_ISCHR(s_stdin.st_mode) && 558 Flag(FTALKING)) 559 reset_nonblock(0); 560 561 /* initialise job control */ 562 j_init(); 563 /* do this after j_init() which calls tty_init_state() */ 564 if (Flag(FTALKING)) { 565 if (utf_flag == 2) { 566 #ifndef MKSH_ASSUME_UTF8 567 /* auto-detect from locale or environment */ 568 utf_flag = 4; 569 #else /* this may not be an #elif */ 570 #if MKSH_ASSUME_UTF8 571 utf_flag = 1; 572 #else 573 /* always disable UTF-8 (for interactive) */ 574 utf_flag = 0; 575 #endif 576 #endif 577 } 578 #ifndef MKSH_NO_CMDLINE_EDITING 579 x_init(); 580 #endif 581 } 582 583 #ifdef SIGWINCH 584 sigtraps[SIGWINCH].flags |= TF_SHELL_USES; 585 setsig(&sigtraps[SIGWINCH], x_sigwinch, 586 SS_RESTORE_ORIG|SS_FORCE|SS_SHTRAP); 587 #endif 588 589 l = e->loc; 590 if (Flag(FAS_BUILTIN)) { 591 l->argc = argc; 592 l->argv = argv; 593 l->argv[0] = ccp; 594 } else { 595 l->argc = argc - argi; 596 /* 597 * allocate a new array because otherwise, when we modify 598 * it in-place, ps(1) output changes; the meaning of argc 599 * here is slightly different as it excludes kshname, and 600 * we add a trailing NULL sentinel as well 601 */ 602 l->argv = alloc2(l->argc + 2, sizeof(void *), APERM); 603 l->argv[0] = kshname; 604 memcpy(&l->argv[1], &argv[argi], l->argc * sizeof(void *)); 605 l->argv[l->argc + 1] = NULL; 606 getopts_reset(1); 607 } 608 609 /* divine the initial state of the utf8-mode Flag */ 610 ccp = null; 611 switch (utf_flag) { 612 613 /* auto-detect from locale or environment */ 614 case 4: 615 #if HAVE_SETLOCALE_CTYPE 616 ccp = setlocale(LC_CTYPE, ""); 617 #if HAVE_LANGINFO_CODESET 618 if (!isuc(ccp)) 619 ccp = nl_langinfo(CODESET); 620 #endif 621 if (!isuc(ccp)) 622 ccp = null; 623 #endif 624 /* FALLTHROUGH */ 625 626 /* auto-detect from environment */ 627 case 3: 628 /* these were imported from environ earlier */ 629 if (ccp == null) 630 ccp = str_val(global("LC_ALL")); 631 if (ccp == null) 632 ccp = str_val(global("LC_CTYPE")); 633 if (ccp == null) 634 ccp = str_val(global("LANG")); 635 UTFMODE = isuc(ccp); 636 break; 637 638 /* not set on command line, not FTALKING */ 639 case 2: 640 /* unknown values */ 641 default: 642 utf_flag = 0; 643 /* FALLTHROUGH */ 644 645 /* known values */ 646 case 1: 647 case 0: 648 UTFMODE = utf_flag; 649 break; 650 } 651 652 /* Disable during .profile/ENV reading */ 653 restricted_shell = Flag(FRESTRICTED); 654 Flag(FRESTRICTED) = 0; 655 errexit = Flag(FERREXIT); 656 Flag(FERREXIT) = 0; 657 658 /* 659 * Do this before profile/$ENV so that if it causes problems in them, 660 * user will know why things broke. 661 */ 662 if (!current_wd[0] && Flag(FTALKING)) 663 warningf(false, "can't determine current directory"); 664 665 if (Flag(FLOGIN)) 666 include(MKSH_SYSTEM_PROFILE, 0, NULL, true); 667 if (!Flag(FPRIVILEGED)) { 668 if (Flag(FLOGIN)) 669 include(substitute("$HOME/.profile", 0), 0, NULL, true); 670 if (Flag(FTALKING)) { 671 cp = substitute(substitute("${ENV:-" MKSHRC_PATH "}", 672 0), DOTILDE); 673 if (cp[0] != '\0') 674 include(cp, 0, NULL, true); 675 } 676 } else { 677 include(MKSH_SUID_PROFILE, 0, NULL, true); 678 /* turn off -p if not set explicitly */ 679 if (Flag(FPRIVILEGED) != 1) 680 change_flag(FPRIVILEGED, OF_INTERNAL, false); 681 } 682 683 if (restricted_shell) { 684 c_builtin(restr_com); 685 /* After typeset command... */ 686 Flag(FRESTRICTED) = 1; 687 } 688 Flag(FERREXIT) = errexit; 689 690 if (Flag(FTALKING) && s) 691 hist_init(s); 692 else 693 /* set after ENV */ 694 Flag(FTRACKALL) = 1; 695 696 alarm_init(); 697 698 *sp = s; 699 *lp = l; 700 return (0); 701 } 702 703 /* this indirection barrier reduces stack usage during normal operation */ 704 705 int 706 main(int argc, const char *argv[]) 707 { 708 int rv; 709 Source *s; 710 struct block *l; 711 712 if ((rv = main_init(argc, argv, &s, &l)) == 0) { 713 if (Flag(FAS_BUILTIN)) { 714 rv = c_builtin(l->argv); 715 } else { 716 shell(s, 0); 717 /* NOTREACHED */ 718 } 719 } 720 return (rv); 721 } 722 723 int 724 include(const char *name, int argc, const char **argv, bool intr_ok) 725 { 726 Source *volatile s = NULL; 727 struct shf *shf; 728 const char **volatile old_argv; 729 volatile int old_argc; 730 int i; 731 732 shf = shf_open(name, O_RDONLY, 0, SHF_MAPHI | SHF_CLEXEC); 733 if (shf == NULL) 734 return (-1); 735 736 if (argv) { 737 old_argv = e->loc->argv; 738 old_argc = e->loc->argc; 739 } else { 740 old_argv = NULL; 741 old_argc = 0; 742 } 743 newenv(E_INCL); 744 if ((i = kshsetjmp(e->jbuf))) { 745 quitenv(s ? s->u.shf : NULL); 746 if (old_argv) { 747 e->loc->argv = old_argv; 748 e->loc->argc = old_argc; 749 } 750 switch (i) { 751 case LRETURN: 752 case LERROR: 753 /* see below */ 754 return (exstat & 0xFF); 755 case LINTR: 756 /* 757 * intr_ok is set if we are including .profile or $ENV. 758 * If user ^Cs out, we don't want to kill the shell... 759 */ 760 if (intr_ok && ((exstat & 0xFF) - 128) != SIGTERM) 761 return (1); 762 /* FALLTHROUGH */ 763 case LEXIT: 764 case LLEAVE: 765 case LSHELL: 766 unwind(i); 767 /* NOTREACHED */ 768 default: 769 internal_errorf(Tunexpected_type, Tunwind, Tsource, i); 770 /* NOTREACHED */ 771 } 772 } 773 if (argv) { 774 e->loc->argv = argv; 775 e->loc->argc = argc; 776 } 777 s = pushs(SFILE, ATEMP); 778 s->u.shf = shf; 779 strdupx(s->file, name, ATEMP); 780 i = shell(s, 1); 781 quitenv(s->u.shf); 782 if (old_argv) { 783 e->loc->argv = old_argv; 784 e->loc->argc = old_argc; 785 } 786 /* & 0xff to ensure value not -1 */ 787 return (i & 0xFF); 788 } 789 790 /* spawn a command into a shell optionally keeping track of the line number */ 791 int 792 command(const char *comm, int line) 793 { 794 Source *s, *sold = source; 795 int rv; 796 797 s = pushs(SSTRING, ATEMP); 798 s->start = s->str = comm; 799 s->line = line; 800 rv = shell(s, 1); 801 source = sold; 802 return (rv); 803 } 804 805 /* 806 * run the commands from the input source, returning status. 807 */ 808 int 809 shell(Source * volatile s, volatile int level) 810 { 811 struct op *t; 812 volatile bool wastty = tobool(s->flags & SF_TTY); 813 volatile uint8_t attempts = 13; 814 volatile bool interactive = (level == 0) && Flag(FTALKING); 815 volatile bool sfirst = true; 816 Source *volatile old_source = source; 817 int i; 818 819 newenv(level == 2 ? E_EVAL : E_PARSE); 820 if (interactive) 821 really_exit = false; 822 switch ((i = kshsetjmp(e->jbuf))) { 823 case 0: 824 break; 825 case LBREAK: 826 case LCONTIN: 827 if (level != 2) { 828 source = old_source; 829 quitenv(NULL); 830 internal_errorf(Tf_cant_s, Tshell, 831 i == LBREAK ? Tbreak : Tcontinue); 832 /* NOTREACHED */ 833 } 834 /* assert: interactive == false */ 835 /* FALLTHROUGH */ 836 case LINTR: 837 /* we get here if SIGINT not caught or ignored */ 838 case LERROR: 839 case LSHELL: 840 if (interactive) { 841 if (i == LINTR) 842 shellf("\n"); 843 /* 844 * Reset any eof that was read as part of a 845 * multiline command. 846 */ 847 if (Flag(FIGNOREEOF) && s->type == SEOF && wastty) 848 s->type = SSTDIN; 849 /* 850 * Used by exit command to get back to 851 * top level shell. Kind of strange since 852 * interactive is set if we are reading from 853 * a tty, but to have stopped jobs, one only 854 * needs FMONITOR set (not FTALKING/SF_TTY)... 855 */ 856 /* toss any input we have so far */ 857 yyrecursive_pop(true); 858 s->start = s->str = null; 859 retrace_info = NULL; 860 herep = heres; 861 break; 862 } 863 /* FALLTHROUGH */ 864 case LEXIT: 865 case LLEAVE: 866 case LRETURN: 867 source = old_source; 868 quitenv(NULL); 869 /* keep on going */ 870 unwind(i); 871 /* NOTREACHED */ 872 default: 873 source = old_source; 874 quitenv(NULL); 875 internal_errorf(Tunexpected_type, Tunwind, Tshell, i); 876 /* NOTREACHED */ 877 } 878 while (/* CONSTCOND */ 1) { 879 if (trap) 880 runtraps(0); 881 882 if (s->next == NULL) { 883 if (Flag(FVERBOSE)) 884 s->flags |= SF_ECHO; 885 else 886 s->flags &= ~SF_ECHO; 887 } 888 if (interactive) { 889 j_notify(); 890 set_prompt(PS1, s); 891 } 892 t = compile(s, sfirst, true); 893 if (interactive) 894 histsave(&s->line, NULL, HIST_FLUSH, true); 895 sfirst = false; 896 if (!t) 897 goto source_no_tree; 898 if (t->type == TEOF) { 899 if (wastty && Flag(FIGNOREEOF) && --attempts > 0) { 900 shellf("Use 'exit' to leave mksh\n"); 901 s->type = SSTDIN; 902 } else if (wastty && !really_exit && 903 j_stopped_running()) { 904 really_exit = true; 905 s->type = SSTDIN; 906 } else { 907 /* 908 * this for POSIX which says EXIT traps 909 * shall be taken in the environment 910 * immediately after the last command 911 * executed. 912 */ 913 if (level == 0) 914 unwind(LEXIT); 915 break; 916 } 917 } else if ((s->flags & SF_MAYEXEC) && t->type == TCOM) 918 t->u.evalflags |= DOTCOMEXEC; 919 if (!Flag(FNOEXEC) || (s->flags & SF_TTY)) 920 exstat = execute(t, 0, NULL) & 0xFF; 921 922 if (t->type != TEOF && interactive && really_exit) 923 really_exit = false; 924 925 source_no_tree: 926 reclaim(); 927 } 928 quitenv(NULL); 929 source = old_source; 930 return (exstat & 0xFF); 931 } 932 933 /* return to closest error handler or shell(), exit if none found */ 934 /* note: i MUST NOT be 0 */ 935 void 936 unwind(int i) 937 { 938 /* 939 * This is a kludge. We need to restore everything that was 940 * changed in the new environment, see cid 1005090337C7A669439 941 * and 10050903386452ACBF1, but fail to even save things most of 942 * the time. funcs.c:c_eval() changes FERREXIT temporarily to 0, 943 * which needs to be restored thus (related to Debian #696823). 944 * We did not save the shell flags, so we use a special or'd 945 * value here... this is mostly to clean up behind *other* 946 * callers of unwind(LERROR) here; exec.c has the regular case. 947 */ 948 if (Flag(FERREXIT) & 0x80) { 949 /* GNU bash does not run this trapsig */ 950 trapsig(ksh_SIGERR); 951 Flag(FERREXIT) &= ~0x80; 952 } 953 954 /* ordering for EXIT vs ERR is a bit odd (this is what AT&T ksh does) */ 955 if (i == LEXIT || ((i == LERROR || i == LINTR) && 956 sigtraps[ksh_SIGEXIT].trap && 957 (!Flag(FTALKING) || Flag(FERREXIT)))) { 958 ++trap_nested; 959 runtrap(&sigtraps[ksh_SIGEXIT], trap_nested == 1); 960 --trap_nested; 961 i = LLEAVE; 962 } else if (Flag(FERREXIT) == 1 && (i == LERROR || i == LINTR)) { 963 ++trap_nested; 964 runtrap(&sigtraps[ksh_SIGERR], trap_nested == 1); 965 --trap_nested; 966 i = LLEAVE; 967 } 968 969 while (/* CONSTCOND */ 1) { 970 switch (e->type) { 971 case E_PARSE: 972 case E_FUNC: 973 case E_INCL: 974 case E_LOOP: 975 case E_ERRH: 976 case E_EVAL: 977 kshlongjmp(e->jbuf, i); 978 /* NOTREACHED */ 979 case E_NONE: 980 if (i == LINTR) 981 e->flags |= EF_FAKE_SIGDIE; 982 /* FALLTHROUGH */ 983 default: 984 quitenv(NULL); 985 } 986 } 987 } 988 989 void 990 newenv(int type) 991 { 992 struct env *ep; 993 char *cp; 994 995 /* 996 * struct env includes ALLOC_ITEM for alignment constraints 997 * so first get the actually used memory, then assign it 998 */ 999 cp = alloc(sizeof(struct env) - sizeof(ALLOC_ITEM), ATEMP); 1000 /* undo what alloc() did to the malloc result address */ 1001 ep = (void *)(cp - sizeof(ALLOC_ITEM)); 1002 /* initialise public members of struct env (not the ALLOC_ITEM) */ 1003 ainit(&ep->area); 1004 ep->oenv = e; 1005 ep->loc = e->loc; 1006 ep->savefd = NULL; 1007 ep->temps = NULL; 1008 ep->yyrecursive_statep = NULL; 1009 ep->type = type; 1010 ep->flags = 0; 1011 /* jump buffer is invalid because flags == 0 */ 1012 e = ep; 1013 } 1014 1015 void 1016 quitenv(struct shf *shf) 1017 { 1018 struct env *ep = e; 1019 char *cp; 1020 int fd; 1021 1022 yyrecursive_pop(true); 1023 while (ep->oenv && ep->oenv->loc != ep->loc) 1024 popblock(); 1025 if (ep->savefd != NULL) { 1026 for (fd = 0; fd < NUFILE; fd++) 1027 /* if ep->savefd[fd] < 0, means fd was closed */ 1028 if (ep->savefd[fd]) 1029 restfd(fd, ep->savefd[fd]); 1030 if (ep->savefd[2]) 1031 /* Clear any write errors */ 1032 shf_reopen(2, SHF_WR, shl_out); 1033 } 1034 /* 1035 * Bottom of the stack. 1036 * Either main shell is exiting or cleanup_parents_env() was called. 1037 */ 1038 if (ep->oenv == NULL) { 1039 #ifdef DEBUG_LEAKS 1040 int i; 1041 #endif 1042 1043 if (ep->type == E_NONE) { 1044 /* Main shell exiting? */ 1045 #if HAVE_PERSISTENT_HISTORY 1046 if (Flag(FTALKING)) 1047 hist_finish(); 1048 #endif 1049 j_exit(); 1050 if (ep->flags & EF_FAKE_SIGDIE) { 1051 int sig = (exstat & 0xFF) - 128; 1052 1053 /* 1054 * ham up our death a bit (AT&T ksh 1055 * only seems to do this for SIGTERM) 1056 * Don't do it for SIGQUIT, since we'd 1057 * dump a core.. 1058 */ 1059 if ((sig == SIGINT || sig == SIGTERM) && 1060 (kshpgrp == kshpid)) { 1061 setsig(&sigtraps[sig], SIG_DFL, 1062 SS_RESTORE_CURR | SS_FORCE); 1063 kill(0, sig); 1064 } 1065 } 1066 } 1067 if (shf) 1068 shf_close(shf); 1069 reclaim(); 1070 #ifdef DEBUG_LEAKS 1071 #ifndef MKSH_NO_CMDLINE_EDITING 1072 x_done(); 1073 #endif 1074 #ifndef MKSH_NOPROSPECTOFWORK 1075 /* block at least SIGCHLD during/after afreeall */ 1076 sigprocmask(SIG_BLOCK, &sm_sigchld, NULL); 1077 #endif 1078 afreeall(APERM); 1079 for (fd = 3; fd < NUFILE; fd++) 1080 if ((i = fcntl(fd, F_GETFD, 0)) != -1 && 1081 (i & FD_CLOEXEC)) 1082 close(fd); 1083 close(2); 1084 close(1); 1085 close(0); 1086 #endif 1087 exit(exstat & 0xFF); 1088 } 1089 if (shf) 1090 shf_close(shf); 1091 reclaim(); 1092 1093 e = e->oenv; 1094 1095 /* free the struct env - tricky due to the ALLOC_ITEM inside */ 1096 cp = (void *)ep; 1097 afree(cp + sizeof(ALLOC_ITEM), ATEMP); 1098 } 1099 1100 /* Called after a fork to cleanup stuff left over from parents environment */ 1101 void 1102 cleanup_parents_env(void) 1103 { 1104 struct env *ep; 1105 int fd; 1106 1107 /* 1108 * Don't clean up temporary files - parent will probably need them. 1109 * Also, can't easily reclaim memory since variables, etc. could be 1110 * anywhere. 1111 */ 1112 1113 /* close all file descriptors hiding in savefd */ 1114 for (ep = e; ep; ep = ep->oenv) { 1115 if (ep->savefd) { 1116 for (fd = 0; fd < NUFILE; fd++) 1117 if (ep->savefd[fd] > 0) 1118 close(ep->savefd[fd]); 1119 afree(ep->savefd, &ep->area); 1120 ep->savefd = NULL; 1121 } 1122 #ifdef DEBUG_LEAKS 1123 if (ep->type != E_NONE) 1124 ep->type = E_GONE; 1125 #endif 1126 } 1127 #ifndef DEBUG_LEAKS 1128 e->oenv = NULL; 1129 #endif 1130 } 1131 1132 /* Called just before an execve cleanup stuff temporary files */ 1133 void 1134 cleanup_proc_env(void) 1135 { 1136 struct env *ep; 1137 1138 for (ep = e; ep; ep = ep->oenv) 1139 remove_temps(ep->temps); 1140 } 1141 1142 /* remove temp files and free ATEMP Area */ 1143 static void 1144 reclaim(void) 1145 { 1146 struct block *l; 1147 1148 while ((l = e->loc) && (!e->oenv || e->oenv->loc != l)) { 1149 e->loc = l->next; 1150 afreeall(&l->area); 1151 } 1152 1153 remove_temps(e->temps); 1154 e->temps = NULL; 1155 1156 /* 1157 * if the memory backing source is reclaimed, things 1158 * will end up badly when a function expecting it to 1159 * be valid is run; a NULL pointer is easily debugged 1160 */ 1161 if (source && source->areap == &e->area) 1162 source = NULL; 1163 afreeall(&e->area); 1164 } 1165 1166 static void 1167 remove_temps(struct temp *tp) 1168 { 1169 while (tp) { 1170 if (tp->pid == procpid) 1171 unlink(tp->tffn); 1172 tp = tp->next; 1173 } 1174 } 1175 1176 /* 1177 * Initialise tty_fd. Used for tracking the size of the terminal, 1178 * saving/resetting tty modes upon forground job completion, and 1179 * for setting up the tty process group. Return values: 1180 * 0 = got controlling tty 1181 * 1 = got terminal but no controlling tty 1182 * 2 = cannot find a terminal 1183 * 3 = cannot dup fd 1184 * 4 = cannot make fd close-on-exec 1185 * An existing tty_fd is cached if no "better" one could be found, 1186 * i.e. if tty_devtty was already set or the new would not set it. 1187 */ 1188 int 1189 tty_init_fd(void) 1190 { 1191 int fd, rv, eno = 0; 1192 bool do_close = false, is_devtty = true; 1193 1194 if (tty_devtty) { 1195 /* already got a tty which is /dev/tty */ 1196 return (0); 1197 } 1198 1199 #ifdef _UWIN 1200 /*XXX imake style */ 1201 if (isatty(3)) { 1202 /* fd 3 on UWIN _is_ /dev/tty (or our controlling tty) */ 1203 fd = 3; 1204 goto got_fd; 1205 } 1206 #endif 1207 if ((fd = open(T_devtty, O_RDWR, 0)) >= 0) { 1208 do_close = true; 1209 goto got_fd; 1210 } 1211 eno = errno; 1212 1213 if (tty_fd >= 0) { 1214 /* already got a non-devtty one */ 1215 rv = 1; 1216 goto out; 1217 } 1218 is_devtty = false; 1219 1220 if (isatty((fd = 0)) || isatty((fd = 2))) 1221 goto got_fd; 1222 /* cannot find one */ 1223 rv = 2; 1224 /* assert: do_close == false */ 1225 goto out; 1226 1227 got_fd: 1228 if ((rv = fcntl(fd, F_DUPFD, FDBASE)) < 0) { 1229 eno = errno; 1230 rv = 3; 1231 goto out; 1232 } 1233 if (fcntl(rv, F_SETFD, FD_CLOEXEC) < 0) { 1234 eno = errno; 1235 close(rv); 1236 rv = 4; 1237 goto out; 1238 } 1239 tty_fd = rv; 1240 tty_devtty = is_devtty; 1241 rv = eno = 0; 1242 out: 1243 if (do_close) 1244 close(fd); 1245 errno = eno; 1246 return (rv); 1247 } 1248 1249 /* A shell error occurred (eg, syntax error, etc.) */ 1250 1251 #define VWARNINGF_ERRORPREFIX 1 1252 #define VWARNINGF_FILELINE 2 1253 #define VWARNINGF_BUILTIN 4 1254 #define VWARNINGF_INTERNAL 8 1255 1256 static void vwarningf(unsigned int, const char *, va_list) 1257 MKSH_A_FORMAT(__printf__, 2, 0); 1258 1259 static void 1260 vwarningf(unsigned int flags, const char *fmt, va_list ap) 1261 { 1262 if (fmt) { 1263 if (flags & VWARNINGF_INTERNAL) 1264 shf_fprintf(shl_out, Tf_sD_, "internal error"); 1265 if (flags & VWARNINGF_ERRORPREFIX) 1266 error_prefix(tobool(flags & VWARNINGF_FILELINE)); 1267 if ((flags & VWARNINGF_BUILTIN) && 1268 /* not set when main() calls parse_args() */ 1269 builtin_argv0 && builtin_argv0 != kshname) 1270 shf_fprintf(shl_out, Tf_sD_, builtin_argv0); 1271 shf_vfprintf(shl_out, fmt, ap); 1272 shf_putchar('\n', shl_out); 1273 } 1274 shf_flush(shl_out); 1275 } 1276 1277 void 1278 errorfx(int rc, const char *fmt, ...) 1279 { 1280 va_list va; 1281 1282 exstat = rc; 1283 1284 /* debugging: note that stdout not valid */ 1285 shl_stdout_ok = false; 1286 1287 va_start(va, fmt); 1288 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va); 1289 va_end(va); 1290 unwind(LERROR); 1291 } 1292 1293 void 1294 errorf(const char *fmt, ...) 1295 { 1296 va_list va; 1297 1298 exstat = 1; 1299 1300 /* debugging: note that stdout not valid */ 1301 shl_stdout_ok = false; 1302 1303 va_start(va, fmt); 1304 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va); 1305 va_end(va); 1306 unwind(LERROR); 1307 } 1308 1309 /* like errorf(), but no unwind is done */ 1310 void 1311 warningf(bool fileline, const char *fmt, ...) 1312 { 1313 va_list va; 1314 1315 va_start(va, fmt); 1316 vwarningf(VWARNINGF_ERRORPREFIX | (fileline ? VWARNINGF_FILELINE : 0), 1317 fmt, va); 1318 va_end(va); 1319 } 1320 1321 /* 1322 * Used by built-in utilities to prefix shell and utility name to message 1323 * (also unwinds environments for special builtins). 1324 */ 1325 void 1326 bi_errorf(const char *fmt, ...) 1327 { 1328 va_list va; 1329 1330 /* debugging: note that stdout not valid */ 1331 shl_stdout_ok = false; 1332 1333 exstat = 1; 1334 1335 va_start(va, fmt); 1336 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE | 1337 VWARNINGF_BUILTIN, fmt, va); 1338 va_end(va); 1339 1340 /* POSIX special builtins cause non-interactive shells to exit */ 1341 if (builtin_spec) { 1342 builtin_argv0 = NULL; 1343 /* may not want to use LERROR here */ 1344 unwind(LERROR); 1345 } 1346 } 1347 1348 /* Called when something that shouldn't happen does */ 1349 void 1350 internal_errorf(const char *fmt, ...) 1351 { 1352 va_list va; 1353 1354 va_start(va, fmt); 1355 vwarningf(VWARNINGF_INTERNAL, fmt, va); 1356 va_end(va); 1357 unwind(LERROR); 1358 } 1359 1360 void 1361 internal_warningf(const char *fmt, ...) 1362 { 1363 va_list va; 1364 1365 va_start(va, fmt); 1366 vwarningf(VWARNINGF_INTERNAL, fmt, va); 1367 va_end(va); 1368 } 1369 1370 /* used by error reporting functions to print "ksh: .kshrc[25]: " */ 1371 void 1372 error_prefix(bool fileline) 1373 { 1374 /* Avoid foo: foo[2]: ... */ 1375 if (!fileline || !source || !source->file || 1376 strcmp(source->file, kshname) != 0) 1377 shf_fprintf(shl_out, Tf_sD_, kshname + (*kshname == '-')); 1378 if (fileline && source && source->file != NULL) { 1379 shf_fprintf(shl_out, "%s[%lu]: ", source->file, 1380 (unsigned long)(source->errline ? 1381 source->errline : source->line)); 1382 source->errline = 0; 1383 } 1384 } 1385 1386 /* printf to shl_out (stderr) with flush */ 1387 void 1388 shellf(const char *fmt, ...) 1389 { 1390 va_list va; 1391 1392 if (!initio_done) 1393 /* shl_out may not be set up yet... */ 1394 return; 1395 va_start(va, fmt); 1396 shf_vfprintf(shl_out, fmt, va); 1397 va_end(va); 1398 shf_flush(shl_out); 1399 } 1400 1401 /* printf to shl_stdout (stdout) */ 1402 void 1403 shprintf(const char *fmt, ...) 1404 { 1405 va_list va; 1406 1407 if (!shl_stdout_ok) 1408 internal_errorf("shl_stdout not valid"); 1409 va_start(va, fmt); 1410 shf_vfprintf(shl_stdout, fmt, va); 1411 va_end(va); 1412 } 1413 1414 /* test if we can seek backwards fd (returns 0 or SHF_UNBUF) */ 1415 int 1416 can_seek(int fd) 1417 { 1418 struct stat statb; 1419 1420 return (fstat(fd, &statb) == 0 && !S_ISREG(statb.st_mode) ? 1421 SHF_UNBUF : 0); 1422 } 1423 1424 #ifdef DF 1425 int shl_dbg_fd; 1426 #define NSHF_IOB 4 1427 #else 1428 #define NSHF_IOB 3 1429 #endif 1430 struct shf shf_iob[NSHF_IOB]; 1431 1432 void 1433 initio(void) 1434 { 1435 #ifdef DF 1436 const char *lfp; 1437 #endif 1438 1439 /* force buffer allocation */ 1440 shf_fdopen(1, SHF_WR, shl_stdout); 1441 shf_fdopen(2, SHF_WR, shl_out); 1442 shf_fdopen(2, SHF_WR, shl_xtrace); 1443 #ifdef DF 1444 if ((lfp = getenv("SDMKSH_PATH")) == NULL) { 1445 if ((lfp = getenv("HOME")) == NULL || !mksh_abspath(lfp)) 1446 errorf("can't get home directory"); 1447 lfp = shf_smprintf(Tf_sSs, lfp, "mksh-dbg.txt"); 1448 } 1449 1450 if ((shl_dbg_fd = open(lfp, O_WRONLY | O_APPEND | O_CREAT, 0600)) < 0) 1451 errorf("can't open debug output file %s", lfp); 1452 if (shl_dbg_fd < FDBASE) { 1453 int nfd; 1454 1455 nfd = fcntl(shl_dbg_fd, F_DUPFD, FDBASE); 1456 close(shl_dbg_fd); 1457 if ((shl_dbg_fd = nfd) == -1) 1458 errorf("can't dup debug output file"); 1459 } 1460 fcntl(shl_dbg_fd, F_SETFD, FD_CLOEXEC); 1461 shf_fdopen(shl_dbg_fd, SHF_WR, shl_dbg); 1462 DF("=== open ==="); 1463 #endif 1464 initio_done = true; 1465 } 1466 1467 /* A dup2() with error checking */ 1468 int 1469 ksh_dup2(int ofd, int nfd, bool errok) 1470 { 1471 int rv; 1472 1473 if (((rv = dup2(ofd, nfd)) < 0) && !errok && (errno != EBADF)) 1474 errorf(Ttoo_many_files); 1475 1476 #ifdef __ultrix 1477 /*XXX imake style */ 1478 if (rv >= 0) 1479 fcntl(nfd, F_SETFD, 0); 1480 #endif 1481 1482 return (rv); 1483 } 1484 1485 /* 1486 * Move fd from user space (0 <= fd < 10) to shell space (fd >= 10), 1487 * set close-on-exec flag. See FDBASE in sh.h, maybe 24 not 10 here. 1488 */ 1489 short 1490 savefd(int fd) 1491 { 1492 int nfd = fd; 1493 1494 if (fd < FDBASE && (nfd = fcntl(fd, F_DUPFD, FDBASE)) < 0 && 1495 (errno == EBADF || errno == EPERM)) 1496 return (-1); 1497 if (nfd < 0 || nfd > SHRT_MAX) 1498 errorf(Ttoo_many_files); 1499 fcntl(nfd, F_SETFD, FD_CLOEXEC); 1500 return ((short)nfd); 1501 } 1502 1503 void 1504 restfd(int fd, int ofd) 1505 { 1506 if (fd == 2) 1507 shf_flush(&shf_iob[/* fd */ 2]); 1508 if (ofd < 0) 1509 /* original fd closed */ 1510 close(fd); 1511 else if (fd != ofd) { 1512 /*XXX: what to do if this dup fails? */ 1513 ksh_dup2(ofd, fd, true); 1514 close(ofd); 1515 } 1516 } 1517 1518 void 1519 openpipe(int *pv) 1520 { 1521 int lpv[2]; 1522 1523 if (pipe(lpv) < 0) 1524 errorf("can't create pipe - try again"); 1525 pv[0] = savefd(lpv[0]); 1526 if (pv[0] != lpv[0]) 1527 close(lpv[0]); 1528 pv[1] = savefd(lpv[1]); 1529 if (pv[1] != lpv[1]) 1530 close(lpv[1]); 1531 #ifdef __OS2__ 1532 setmode(pv[0], O_BINARY); 1533 setmode(pv[1], O_BINARY); 1534 #endif 1535 } 1536 1537 void 1538 closepipe(int *pv) 1539 { 1540 close(pv[0]); 1541 close(pv[1]); 1542 } 1543 1544 /* 1545 * Called by iosetup() (deals with 2>&4, etc.), c_read, c_print to turn 1546 * a string (the X in 2>&X, read -uX, print -uX) into a file descriptor. 1547 */ 1548 int 1549 check_fd(const char *name, int mode, const char **emsgp) 1550 { 1551 int fd, fl; 1552 1553 if (!name[0] || name[1]) 1554 goto illegal_fd_name; 1555 if (name[0] == 'p') 1556 return (coproc_getfd(mode, emsgp)); 1557 if (!ksh_isdigit(name[0])) { 1558 illegal_fd_name: 1559 if (emsgp) 1560 *emsgp = "illegal file descriptor name"; 1561 return (-1); 1562 } 1563 1564 if ((fl = fcntl((fd = ksh_numdig(name[0])), F_GETFL, 0)) < 0) { 1565 if (emsgp) 1566 *emsgp = "bad file descriptor"; 1567 return (-1); 1568 } 1569 fl &= O_ACCMODE; 1570 /* 1571 * X_OK is a kludge to disable this check for dups (x<&1): 1572 * historical shells never did this check (XXX don't know what 1573 * POSIX has to say). 1574 */ 1575 if (!(mode & X_OK) && fl != O_RDWR && ( 1576 ((mode & R_OK) && fl != O_RDONLY) || 1577 ((mode & W_OK) && fl != O_WRONLY))) { 1578 if (emsgp) 1579 *emsgp = (fl == O_WRONLY) ? 1580 "fd not open for reading" : 1581 "fd not open for writing"; 1582 return (-1); 1583 } 1584 return (fd); 1585 } 1586 1587 /* Called once from main */ 1588 void 1589 coproc_init(void) 1590 { 1591 coproc.read = coproc.readw = coproc.write = -1; 1592 coproc.njobs = 0; 1593 coproc.id = 0; 1594 } 1595 1596 /* Called by c_read() when eof is read - close fd if it is the co-process fd */ 1597 void 1598 coproc_read_close(int fd) 1599 { 1600 if (coproc.read >= 0 && fd == coproc.read) { 1601 coproc_readw_close(fd); 1602 close(coproc.read); 1603 coproc.read = -1; 1604 } 1605 } 1606 1607 /* 1608 * Called by c_read() and by iosetup() to close the other side of the 1609 * read pipe, so reads will actually terminate. 1610 */ 1611 void 1612 coproc_readw_close(int fd) 1613 { 1614 if (coproc.readw >= 0 && coproc.read >= 0 && fd == coproc.read) { 1615 close(coproc.readw); 1616 coproc.readw = -1; 1617 } 1618 } 1619 1620 /* 1621 * Called by c_print when a write to a fd fails with EPIPE and by iosetup 1622 * when co-process input is dup'd 1623 */ 1624 void 1625 coproc_write_close(int fd) 1626 { 1627 if (coproc.write >= 0 && fd == coproc.write) { 1628 close(coproc.write); 1629 coproc.write = -1; 1630 } 1631 } 1632 1633 /* 1634 * Called to check for existence of/value of the co-process file descriptor. 1635 * (Used by check_fd() and by c_read/c_print to deal with -p option). 1636 */ 1637 int 1638 coproc_getfd(int mode, const char **emsgp) 1639 { 1640 int fd = (mode & R_OK) ? coproc.read : coproc.write; 1641 1642 if (fd >= 0) 1643 return (fd); 1644 if (emsgp) 1645 *emsgp = "no coprocess"; 1646 return (-1); 1647 } 1648 1649 /* 1650 * called to close file descriptors related to the coprocess (if any) 1651 * Should be called with SIGCHLD blocked. 1652 */ 1653 void 1654 coproc_cleanup(int reuse) 1655 { 1656 /* This to allow co-processes to share output pipe */ 1657 if (!reuse || coproc.readw < 0 || coproc.read < 0) { 1658 if (coproc.read >= 0) { 1659 close(coproc.read); 1660 coproc.read = -1; 1661 } 1662 if (coproc.readw >= 0) { 1663 close(coproc.readw); 1664 coproc.readw = -1; 1665 } 1666 } 1667 if (coproc.write >= 0) { 1668 close(coproc.write); 1669 coproc.write = -1; 1670 } 1671 } 1672 1673 struct temp * 1674 maketemp(Area *ap, Temp_type type, struct temp **tlist) 1675 { 1676 char *cp; 1677 size_t len; 1678 int i, j; 1679 struct temp *tp; 1680 const char *dir; 1681 struct stat sb; 1682 1683 dir = tmpdir ? tmpdir : MKSH_DEFAULT_TMPDIR; 1684 /* add "/shXXXXXX.tmp" plus NUL */ 1685 len = strlen(dir); 1686 checkoktoadd(len, offsetof(struct temp, tffn[0]) + 14); 1687 tp = alloc(offsetof(struct temp, tffn[0]) + 14 + len, ap); 1688 1689 tp->shf = NULL; 1690 tp->pid = procpid; 1691 tp->type = type; 1692 1693 if (stat(dir, &sb) || !S_ISDIR(sb.st_mode)) { 1694 tp->tffn[0] = '\0'; 1695 goto maketemp_out; 1696 } 1697 1698 cp = (void *)tp; 1699 cp += offsetof(struct temp, tffn[0]); 1700 memcpy(cp, dir, len); 1701 cp += len; 1702 memcpy(cp, "/shXXXXXX.tmp", 14); 1703 /* point to the first of six Xes */ 1704 cp += 3; 1705 1706 /* cyclically attempt to open a temporary file */ 1707 do { 1708 /* generate random part of filename */ 1709 len = 0; 1710 do { 1711 cp[len++] = digits_lc[rndget() % 36]; 1712 } while (len < 6); 1713 1714 /* check if this one works */ 1715 if ((i = binopen3(tp->tffn, O_CREAT | O_EXCL | O_RDWR, 1716 0600)) < 0 && errno != EEXIST) 1717 goto maketemp_out; 1718 } while (i < 0); 1719 1720 if (type == TT_FUNSUB) { 1721 /* map us high and mark as close-on-exec */ 1722 if ((j = savefd(i)) != i) { 1723 close(i); 1724 i = j; 1725 } 1726 1727 /* operation mode for the shf */ 1728 j = SHF_RD; 1729 } else 1730 j = SHF_WR; 1731 1732 /* shf_fdopen cannot fail, so no fd leak */ 1733 tp->shf = shf_fdopen(i, j, NULL); 1734 1735 maketemp_out: 1736 tp->next = *tlist; 1737 *tlist = tp; 1738 return (tp); 1739 } 1740 1741 /* 1742 * We use a similar collision resolution algorithm as Python 2.5.4 1743 * but with a slightly tweaked implementation written from scratch. 1744 */ 1745 1746 #define INIT_TBLSHIFT 3 /* initial table shift (2^3 = 8) */ 1747 #define PERTURB_SHIFT 5 /* see Python 2.5.4 Objects/dictobject.c */ 1748 1749 static void tgrow(struct table *); 1750 static int tnamecmp(const void *, const void *); 1751 1752 static void 1753 tgrow(struct table *tp) 1754 { 1755 size_t i, j, osize, mask, perturb; 1756 struct tbl *tblp, **pp; 1757 struct tbl **ntblp, **otblp = tp->tbls; 1758 1759 if (tp->tshift > 29) 1760 internal_errorf("hash table size limit reached"); 1761 1762 /* calculate old size, new shift and new size */ 1763 osize = (size_t)1 << (tp->tshift++); 1764 i = osize << 1; 1765 1766 ntblp = alloc2(i, sizeof(struct tbl *), tp->areap); 1767 /* multiplication cannot overflow: alloc2 checked that */ 1768 memset(ntblp, 0, i * sizeof(struct tbl *)); 1769 1770 /* table can get very full when reaching its size limit */ 1771 tp->nfree = (tp->tshift == 30) ? 0x3FFF0000UL : 1772 /* but otherwise, only 75% */ 1773 ((i * 3) / 4); 1774 tp->tbls = ntblp; 1775 if (otblp == NULL) 1776 return; 1777 1778 mask = i - 1; 1779 for (i = 0; i < osize; i++) 1780 if ((tblp = otblp[i]) != NULL) { 1781 if ((tblp->flag & DEFINED)) { 1782 /* search for free hash table slot */ 1783 j = perturb = tblp->ua.hval; 1784 goto find_first_empty_slot; 1785 find_next_empty_slot: 1786 j = (j << 2) + j + perturb + 1; 1787 perturb >>= PERTURB_SHIFT; 1788 find_first_empty_slot: 1789 pp = &ntblp[j & mask]; 1790 if (*pp != NULL) 1791 goto find_next_empty_slot; 1792 /* found an empty hash table slot */ 1793 *pp = tblp; 1794 tp->nfree--; 1795 } else if (!(tblp->flag & FINUSE)) { 1796 afree(tblp, tp->areap); 1797 } 1798 } 1799 afree(otblp, tp->areap); 1800 } 1801 1802 void 1803 ktinit(Area *ap, struct table *tp, uint8_t initshift) 1804 { 1805 tp->areap = ap; 1806 tp->tbls = NULL; 1807 tp->tshift = ((initshift > INIT_TBLSHIFT) ? 1808 initshift : INIT_TBLSHIFT) - 1; 1809 tgrow(tp); 1810 } 1811 1812 /* table, name (key) to search for, hash(name), rv pointer to tbl ptr */ 1813 struct tbl * 1814 ktscan(struct table *tp, const char *name, uint32_t h, struct tbl ***ppp) 1815 { 1816 size_t j, perturb, mask; 1817 struct tbl **pp, *p; 1818 1819 mask = ((size_t)1 << (tp->tshift)) - 1; 1820 /* search for hash table slot matching name */ 1821 j = perturb = h; 1822 goto find_first_slot; 1823 find_next_slot: 1824 j = (j << 2) + j + perturb + 1; 1825 perturb >>= PERTURB_SHIFT; 1826 find_first_slot: 1827 pp = &tp->tbls[j & mask]; 1828 if ((p = *pp) != NULL && (p->ua.hval != h || !(p->flag & DEFINED) || 1829 strcmp(p->name, name))) 1830 goto find_next_slot; 1831 /* p == NULL if not found, correct found entry otherwise */ 1832 if (ppp) 1833 *ppp = pp; 1834 return (p); 1835 } 1836 1837 /* table, name (key) to enter, hash(n) */ 1838 struct tbl * 1839 ktenter(struct table *tp, const char *n, uint32_t h) 1840 { 1841 struct tbl **pp, *p; 1842 size_t len; 1843 1844 Search: 1845 if ((p = ktscan(tp, n, h, &pp))) 1846 return (p); 1847 1848 if (tp->nfree == 0) { 1849 /* too full */ 1850 tgrow(tp); 1851 goto Search; 1852 } 1853 1854 /* create new tbl entry */ 1855 len = strlen(n); 1856 checkoktoadd(len, offsetof(struct tbl, name[0]) + 1); 1857 p = alloc(offsetof(struct tbl, name[0]) + ++len, tp->areap); 1858 p->flag = 0; 1859 p->type = 0; 1860 p->areap = tp->areap; 1861 p->ua.hval = h; 1862 p->u2.field = 0; 1863 p->u.array = NULL; 1864 memcpy(p->name, n, len); 1865 1866 /* enter in tp->tbls */ 1867 tp->nfree--; 1868 *pp = p; 1869 return (p); 1870 } 1871 1872 void 1873 ktwalk(struct tstate *ts, struct table *tp) 1874 { 1875 ts->left = (size_t)1 << (tp->tshift); 1876 ts->next = tp->tbls; 1877 } 1878 1879 struct tbl * 1880 ktnext(struct tstate *ts) 1881 { 1882 while (--ts->left >= 0) { 1883 struct tbl *p = *ts->next++; 1884 if (p != NULL && (p->flag & DEFINED)) 1885 return (p); 1886 } 1887 return (NULL); 1888 } 1889 1890 static int 1891 tnamecmp(const void *p1, const void *p2) 1892 { 1893 const struct tbl *a = *((const struct tbl * const *)p1); 1894 const struct tbl *b = *((const struct tbl * const *)p2); 1895 1896 return (strcmp(a->name, b->name)); 1897 } 1898 1899 struct tbl ** 1900 ktsort(struct table *tp) 1901 { 1902 size_t i; 1903 struct tbl **p, **sp, **dp; 1904 1905 /* 1906 * since the table is never entirely full, no need to reserve 1907 * additional space for the trailing NULL appended below 1908 */ 1909 i = (size_t)1 << (tp->tshift); 1910 p = alloc2(i, sizeof(struct tbl *), ATEMP); 1911 sp = tp->tbls; /* source */ 1912 dp = p; /* dest */ 1913 while (i--) 1914 if ((*dp = *sp++) != NULL && (((*dp)->flag & DEFINED) || 1915 ((*dp)->flag & ARRAY))) 1916 dp++; 1917 qsort(p, (i = dp - p), sizeof(struct tbl *), tnamecmp); 1918 p[i] = NULL; 1919 return (p); 1920 } 1921 1922 #ifdef SIGWINCH 1923 static void 1924 x_sigwinch(int sig MKSH_A_UNUSED) 1925 { 1926 /* this runs inside interrupt context, with errno saved */ 1927 1928 got_winch = 1; 1929 } 1930 #endif 1931 1932 #ifdef DF 1933 void 1934 DF(const char *fmt, ...) 1935 { 1936 va_list args; 1937 struct timeval tv; 1938 mirtime_mjd mjd; 1939 1940 mksh_lockfd(shl_dbg_fd); 1941 mksh_TIME(tv); 1942 timet2mjd(&mjd, tv.tv_sec); 1943 shf_fprintf(shl_dbg, "[%02u:%02u:%02u (%u) %u.%06u] ", 1944 (unsigned)mjd.sec / 3600, ((unsigned)mjd.sec / 60) % 60, 1945 (unsigned)mjd.sec % 60, (unsigned)getpid(), 1946 (unsigned)tv.tv_sec, (unsigned)tv.tv_usec); 1947 va_start(args, fmt); 1948 shf_vfprintf(shl_dbg, fmt, args); 1949 va_end(args); 1950 shf_putc('\n', shl_dbg); 1951 shf_flush(shl_dbg); 1952 mksh_unlkfd(shl_dbg_fd); 1953 } 1954 #endif 1955 1956 void 1957 x_mkraw(int fd, mksh_ttyst *ocb, bool forread) 1958 { 1959 mksh_ttyst cb; 1960 1961 if (ocb) 1962 mksh_tcget(fd, ocb); 1963 else 1964 ocb = &tty_state; 1965 1966 cb = *ocb; 1967 if (forread) { 1968 cb.c_iflag &= ~(ISTRIP); 1969 cb.c_lflag &= ~(ICANON) | ECHO; 1970 } else { 1971 cb.c_iflag &= ~(INLCR | ICRNL | ISTRIP); 1972 cb.c_lflag &= ~(ISIG | ICANON | ECHO); 1973 } 1974 #if defined(VLNEXT) && defined(_POSIX_VDISABLE) 1975 /* OSF/1 processes lnext when ~icanon */ 1976 cb.c_cc[VLNEXT] = _POSIX_VDISABLE; 1977 #endif 1978 /* SunOS 4.1.x & OSF/1 processes discard(flush) when ~icanon */ 1979 #if defined(VDISCARD) && defined(_POSIX_VDISABLE) 1980 cb.c_cc[VDISCARD] = _POSIX_VDISABLE; 1981 #endif 1982 cb.c_cc[VTIME] = 0; 1983 cb.c_cc[VMIN] = 1; 1984 1985 mksh_tcset(fd, &cb); 1986 } 1987
