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, 2018 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 1.347 2018/01/13 21:45:07 tg Exp $"); 38 39 #ifndef MKSHRC_PATH 40 #define MKSHRC_PATH "~/.mkshrc" 41 #endif 42 43 #ifndef MKSH_DEFAULT_TMPDIR 44 #define MKSH_DEFAULT_TMPDIR MKSH_UNIXROOT "/tmp" 45 #endif 46 47 static uint8_t isuc(const char *); 48 static int main_init(int, const char *[], Source **, struct block **); 49 void chvt_reinit(void); 50 static void reclaim(void); 51 static void remove_temps(struct temp *); 52 static mksh_uari_t rndsetup(void); 53 static void init_environ(void); 54 #ifdef SIGWINCH 55 static void x_sigwinch(int); 56 #endif 57 58 static const char initsubs[] = 59 "${PS2=> }" 60 "${PS3=#? }" 61 "${PS4=+ }" 62 "${SECONDS=0}" 63 "${TMOUT=0}" 64 "${EPOCHREALTIME=}"; 65 66 static const char *initcoms[] = { 67 Ttypeset, "-r", initvsn, NULL, 68 Ttypeset, "-x", "HOME", TPATH, TSHELL, NULL, 69 Ttypeset, "-i10", "COLUMNS", "LINES", "SECONDS", "TMOUT", NULL, 70 Talias, 71 "integer=\\\\builtin typeset -i", 72 "local=\\\\builtin typeset", 73 /* not "alias -t --": hash -r needs to work */ 74 "hash=\\\\builtin alias -t", 75 "type=\\\\builtin whence -v", 76 "autoload=\\\\builtin typeset -fu", 77 "functions=\\\\builtin typeset -f", 78 "history=\\\\builtin fc -l", 79 "nameref=\\\\builtin typeset -n", 80 "nohup=nohup ", 81 "r=\\\\builtin fc -e -", 82 "login=\\\\builtin exec login", 83 NULL, 84 /* this is what AT&T ksh seems to track, with the addition of emacs */ 85 Talias, "-tU", 86 Tcat, "cc", "chmod", "cp", "date", "ed", "emacs", "grep", "ls", 87 "make", "mv", "pr", "rm", "sed", Tsh, "vi", "who", NULL, 88 NULL 89 }; 90 91 static const char *restr_com[] = { 92 Ttypeset, "-r", TPATH, "ENV", TSHELL, NULL 93 }; 94 95 static bool initio_done; 96 97 /* top-level parsing and execution environment */ 98 static struct env env; 99 struct env *e = &env; 100 101 /* compile-time assertions */ 102 #define cta(name, expr) struct cta_ ## name { char t[(expr) ? 1 : -1]; } 103 104 /* this one should be defined by the standard */ 105 cta(char_is_1_char, (sizeof(char) == 1) && (sizeof(signed char) == 1) && 106 (sizeof(unsigned char) == 1)); 107 cta(char_is_8_bits, ((CHAR_BIT) == 8) && ((int)(unsigned char)0xFF == 0xFF) && 108 ((int)(unsigned char)0x100 == 0) && ((int)(unsigned char)(int)-1 == 0xFF)); 109 /* the next assertion is probably not really needed */ 110 cta(short_is_2_char, sizeof(short) == 2); 111 cta(short_size_no_matter_of_signedness, sizeof(short) == sizeof(unsigned short)); 112 /* the next assertion is probably not really needed */ 113 cta(int_is_4_char, sizeof(int) == 4); 114 cta(int_size_no_matter_of_signedness, sizeof(int) == sizeof(unsigned int)); 115 116 cta(long_ge_int, sizeof(long) >= sizeof(int)); 117 cta(long_size_no_matter_of_signedness, sizeof(long) == sizeof(unsigned long)); 118 119 #ifndef MKSH_LEGACY_MODE 120 /* the next assertion is probably not really needed */ 121 cta(ari_is_4_char, sizeof(mksh_ari_t) == 4); 122 /* but this is */ 123 cta(ari_has_31_bit, 0 < (mksh_ari_t)(((((mksh_ari_t)1 << 15) << 15) - 1) * 2 + 1)); 124 /* the next assertion is probably not really needed */ 125 cta(uari_is_4_char, sizeof(mksh_uari_t) == 4); 126 /* but the next three are; we REQUIRE unsigned integer wraparound */ 127 cta(uari_has_31_bit, 0 < (mksh_uari_t)(((((mksh_uari_t)1 << 15) << 15) - 1) * 2 + 1)); 128 cta(uari_has_32_bit, 0 < (mksh_uari_t)(((((mksh_uari_t)1 << 15) << 15) - 1) * 4 + 3)); 129 cta(uari_wrap_32_bit, 130 (mksh_uari_t)(((((mksh_uari_t)1 << 15) << 15) - 1) * 4 + 3) > 131 (mksh_uari_t)(((((mksh_uari_t)1 << 15) << 15) - 1) * 4 + 4)); 132 #endif 133 /* these are always required */ 134 cta(ari_is_signed, (mksh_ari_t)-1 < (mksh_ari_t)0); 135 cta(uari_is_unsigned, (mksh_uari_t)-1 > (mksh_uari_t)0); 136 /* we require these to have the precisely same size and assume 2s complement */ 137 cta(ari_size_no_matter_of_signedness, sizeof(mksh_ari_t) == sizeof(mksh_uari_t)); 138 139 cta(sizet_size_no_matter_of_signedness, sizeof(ssize_t) == sizeof(size_t)); 140 cta(sizet_voidptr_same_size, sizeof(size_t) == sizeof(void *)); 141 cta(sizet_funcptr_same_size, sizeof(size_t) == sizeof(void (*)(void))); 142 /* our formatting routines assume this */ 143 cta(ptr_fits_in_long, sizeof(size_t) <= sizeof(long)); 144 cta(ari_fits_in_long, sizeof(mksh_ari_t) <= sizeof(long)); 145 146 static mksh_uari_t 147 rndsetup(void) 148 { 149 register uint32_t h; 150 struct { 151 ALLOC_ITEM alloc_INT; 152 void *dataptr, *stkptr, *mallocptr; 153 #if defined(__GLIBC__) && (__GLIBC__ >= 2) 154 sigjmp_buf jbuf; 155 #endif 156 struct timeval tv; 157 } *bufptr; 158 char *cp; 159 160 cp = alloc(sizeof(*bufptr) - sizeof(ALLOC_ITEM), APERM); 161 /* clear the allocated space, for valgrind and to avoid UB */ 162 memset(cp, 0, sizeof(*bufptr) - sizeof(ALLOC_ITEM)); 163 /* undo what alloc() did to the malloc result address */ 164 bufptr = (void *)(cp - sizeof(ALLOC_ITEM)); 165 /* PIE or something similar provides us with deltas here */ 166 bufptr->dataptr = &rndsetupstate; 167 /* ASLR in at least Windows, Linux, some BSDs */ 168 bufptr->stkptr = &bufptr; 169 /* randomised malloc in BSD (and possibly others) */ 170 bufptr->mallocptr = bufptr; 171 #if defined(__GLIBC__) && (__GLIBC__ >= 2) 172 /* glibc pointer guard */ 173 sigsetjmp(bufptr->jbuf, 1); 174 #endif 175 /* introduce variation (and yes, second arg MBZ for portability) */ 176 mksh_TIME(bufptr->tv); 177 178 #ifdef MKSH_ALLOC_CATCH_UNDERRUNS 179 mprotect(((char *)bufptr) + 4096, 4096, PROT_READ | PROT_WRITE); 180 #endif 181 h = chvt_rndsetup(bufptr, sizeof(*bufptr)); 182 183 afree(cp, APERM); 184 return ((mksh_uari_t)h); 185 } 186 187 void 188 chvt_reinit(void) 189 { 190 kshpid = procpid = getpid(); 191 ksheuid = geteuid(); 192 kshpgrp = getpgrp(); 193 kshppid = getppid(); 194 } 195 196 static const char *empty_argv[] = { 197 Tmksh, NULL 198 }; 199 200 static uint8_t 201 isuc(const char *cx) { 202 char *cp, *x; 203 uint8_t rv = 0; 204 205 if (!cx || !*cx) 206 return (0); 207 208 /* uppercase a string duplicate */ 209 strdupx(x, cx, ATEMP); 210 cp = x; 211 while ((*cp = ksh_toupper(*cp))) 212 ++cp; 213 214 /* check for UTF-8 */ 215 if (strstr(x, "UTF-8") || strstr(x, "UTF8")) 216 rv = 1; 217 218 /* free copy and out */ 219 afree(x, ATEMP); 220 return (rv); 221 } 222 223 static int 224 main_init(int argc, const char *argv[], Source **sp, struct block **lp) 225 { 226 int argi, i; 227 Source *s = NULL; 228 struct block *l; 229 unsigned char restricted_shell, errexit, utf_flag; 230 char *cp; 231 const char *ccp, **wp; 232 struct tbl *vp; 233 struct stat s_stdin; 234 #if !defined(_PATH_DEFPATH) && defined(_CS_PATH) 235 ssize_t k; 236 #endif 237 238 #if defined(MKSH_EBCDIC) || defined(MKSH_FAUX_EBCDIC) 239 ebcdic_init(); 240 #endif 241 set_ifs(TC_IFSWS); 242 243 #ifdef __OS2__ 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 inittraps(); 337 338 coproc_init(); 339 340 /* set up variable and command dictionaries */ 341 ktinit(APERM, &taliases, 0); 342 ktinit(APERM, &aliases, 0); 343 #ifndef MKSH_NOPWNAM 344 ktinit(APERM, &homedirs, 0); 345 #endif 346 347 /* define shell keywords */ 348 initkeywords(); 349 350 init_histvec(); 351 352 /* initialise tty size before importing environment */ 353 change_winsz(); 354 355 #ifdef _PATH_DEFPATH 356 def_path = _PATH_DEFPATH; 357 #else 358 #ifdef _CS_PATH 359 if ((k = confstr(_CS_PATH, NULL, 0)) > 0 && 360 confstr(_CS_PATH, cp = alloc(k + 1, APERM), k + 1) == k + 1) 361 def_path = cp; 362 else 363 #endif 364 /* 365 * this is uniform across all OSes unless it 366 * breaks somewhere hard; don't try to optimise, 367 * e.g. add stuff for Interix or remove /usr 368 * for HURD, because e.g. Debian GNU/HURD is 369 * "keeping a regular /usr"; this is supposed 370 * to be a sane 'basic' default PATH 371 */ 372 def_path = MKSH_UNIXROOT "/bin" MKSH_PATHSEPS 373 MKSH_UNIXROOT "/usr/bin" MKSH_PATHSEPS 374 MKSH_UNIXROOT "/sbin" MKSH_PATHSEPS 375 MKSH_UNIXROOT "/usr/sbin"; 376 #endif 377 378 /* 379 * Set PATH to def_path (will set the path global variable). 380 * (import of environment below will probably change this setting). 381 */ 382 vp = global(TPATH); 383 /* setstr can't fail here */ 384 setstr(vp, def_path, KSH_RETURN_ERROR); 385 386 #ifndef MKSH_NO_CMDLINE_EDITING 387 /* 388 * Set edit mode to emacs by default, may be overridden 389 * by the environment or the user. Also, we want tab completion 390 * on in vi by default. 391 */ 392 change_flag(FEMACS, OF_SPECIAL, true); 393 #if !MKSH_S_NOVI 394 Flag(FVITABCOMPLETE) = 1; 395 #endif 396 #endif 397 398 /* import environment */ 399 init_environ(); 400 401 /* override default PATH regardless of environment */ 402 #ifdef MKSH_DEFPATH_OVERRIDE 403 vp = global(TPATH); 404 setstr(vp, MKSH_DEFPATH_OVERRIDE, KSH_RETURN_ERROR); 405 #endif 406 407 /* for security */ 408 typeset(TinitIFS, 0, 0, 0, 0); 409 410 /* assign default shell variable values */ 411 typeset("PATHSEP=" MKSH_PATHSEPS, 0, 0, 0, 0); 412 substitute(initsubs, 0); 413 414 /* Figure out the current working directory and set $PWD */ 415 vp = global(TPWD); 416 cp = str_val(vp); 417 /* Try to use existing $PWD if it is valid */ 418 set_current_wd((mksh_abspath(cp) && test_eval(NULL, TO_FILEQ, cp, 419 Tdot, true)) ? cp : NULL); 420 if (current_wd[0]) 421 simplify_path(current_wd); 422 /* Only set pwd if we know where we are or if it had a bogus value */ 423 if (current_wd[0] || *cp) 424 /* setstr can't fail here */ 425 setstr(vp, current_wd, KSH_RETURN_ERROR); 426 427 for (wp = initcoms; *wp != NULL; wp++) { 428 c_builtin(wp); 429 while (*wp != NULL) 430 wp++; 431 } 432 setint_n(global("OPTIND"), 1, 10); 433 434 kshuid = getuid(); 435 kshgid = getgid(); 436 kshegid = getegid(); 437 438 safe_prompt = ksheuid ? "$ " : "# "; 439 vp = global("PS1"); 440 /* Set PS1 if unset or we are root and prompt doesn't contain a # */ 441 if (!(vp->flag & ISSET) || 442 (!ksheuid && !strchr(str_val(vp), '#'))) 443 /* setstr can't fail here */ 444 setstr(vp, safe_prompt, KSH_RETURN_ERROR); 445 setint_n((vp = global("BASHPID")), 0, 10); 446 vp->flag |= INT_U; 447 setint_n((vp = global("PGRP")), (mksh_uari_t)kshpgrp, 10); 448 vp->flag |= INT_U; 449 setint_n((vp = global("PPID")), (mksh_uari_t)kshppid, 10); 450 vp->flag |= INT_U; 451 setint_n((vp = global("USER_ID")), (mksh_uari_t)ksheuid, 10); 452 vp->flag |= INT_U; 453 setint_n((vp = global("KSHUID")), (mksh_uari_t)kshuid, 10); 454 vp->flag |= INT_U; 455 setint_n((vp = global("KSHEGID")), (mksh_uari_t)kshegid, 10); 456 vp->flag |= INT_U; 457 setint_n((vp = global("KSHGID")), (mksh_uari_t)kshgid, 10); 458 vp->flag |= INT_U; 459 setint_n((vp = global("RANDOM")), rndsetup(), 10); 460 vp->flag |= INT_U; 461 setint_n((vp_pipest = global("PIPESTATUS")), 0, 10); 462 463 /* Set this before parsing arguments */ 464 Flag(FPRIVILEGED) = (kshuid != ksheuid || kshgid != kshegid) ? 2 : 0; 465 466 /* this to note if monitor is set on command line (see below) */ 467 #ifndef MKSH_UNEMPLOYED 468 Flag(FMONITOR) = 127; 469 #endif 470 /* this to note if utf-8 mode is set on command line (see below) */ 471 UTFMODE = 2; 472 473 if (!Flag(FAS_BUILTIN)) { 474 argi = parse_args(argv, OF_CMDLINE, NULL); 475 if (argi < 0) 476 return (1); 477 } 478 479 /* process this later only, default to off (hysterical raisins) */ 480 utf_flag = UTFMODE; 481 UTFMODE = 0; 482 483 if (Flag(FAS_BUILTIN)) { 484 /* auto-detect from environment variables, always */ 485 utf_flag = 3; 486 } else if (Flag(FCOMMAND)) { 487 s = pushs(SSTRINGCMDLINE, ATEMP); 488 if (!(s->start = s->str = argv[argi++])) 489 errorf(Tf_optfoo, "", "", 'c', Treq_arg); 490 while (*s->str) { 491 if (ctype(*s->str, C_QUOTE)) 492 break; 493 s->str++; 494 } 495 if (!*s->str) 496 s->flags |= SF_MAYEXEC; 497 s->str = s->start; 498 #ifdef MKSH_MIDNIGHTBSD01ASH_COMPAT 499 /* compatibility to MidnightBSD 0.1 /bin/sh (kludge) */ 500 if (Flag(FSH) && argv[argi] && !strcmp(argv[argi], "--")) 501 ++argi; 502 #endif 503 if (argv[argi]) 504 kshname = argv[argi++]; 505 } else if (argi < argc && !Flag(FSTDIN)) { 506 s = pushs(SFILE, ATEMP); 507 #ifdef __OS2__ 508 /* 509 * A bug in OS/2 extproc (like shebang) handling makes 510 * it not pass the full pathname of a script, so we need 511 * to search for it. This changes the behaviour of a 512 * simple "mksh foo", but can't be helped. 513 */ 514 s->file = argv[argi++]; 515 if (search_access(s->file, X_OK) != 0) 516 s->file = search_path(s->file, path, X_OK, NULL); 517 if (!s->file || !*s->file) 518 s->file = argv[argi - 1]; 519 #else 520 s->file = argv[argi++]; 521 #endif 522 s->u.shf = shf_open(s->file, O_RDONLY, 0, 523 SHF_MAPHI | SHF_CLEXEC); 524 if (s->u.shf == NULL) { 525 shl_stdout_ok = false; 526 warningf(true, Tf_sD_s, s->file, cstrerror(errno)); 527 /* mandated by SUSv4 */ 528 exstat = 127; 529 unwind(LERROR); 530 } 531 kshname = s->file; 532 } else { 533 Flag(FSTDIN) = 1; 534 s = pushs(SSTDIN, ATEMP); 535 s->file = "<stdin>"; 536 s->u.shf = shf_fdopen(0, SHF_RD | can_seek(0), 537 NULL); 538 if (isatty(0) && isatty(2)) { 539 Flag(FTALKING) = Flag(FTALKING_I) = 1; 540 /* The following only if isatty(0) */ 541 s->flags |= SF_TTY; 542 s->u.shf->flags |= SHF_INTERRUPT; 543 s->file = NULL; 544 } 545 } 546 547 /* this bizarreness is mandated by POSIX */ 548 if (fstat(0, &s_stdin) >= 0 && S_ISCHR(s_stdin.st_mode) && 549 Flag(FTALKING)) 550 reset_nonblock(0); 551 552 /* initialise job control */ 553 j_init(); 554 /* do this after j_init() which calls tty_init_state() */ 555 if (Flag(FTALKING)) { 556 if (utf_flag == 2) { 557 #ifndef MKSH_ASSUME_UTF8 558 /* auto-detect from locale or environment */ 559 utf_flag = 4; 560 #else /* this may not be an #elif */ 561 #if MKSH_ASSUME_UTF8 562 utf_flag = 1; 563 #else 564 /* always disable UTF-8 (for interactive) */ 565 utf_flag = 0; 566 #endif 567 #endif 568 } 569 #ifndef MKSH_NO_CMDLINE_EDITING 570 x_init(); 571 #endif 572 } 573 574 #ifdef SIGWINCH 575 sigtraps[SIGWINCH].flags |= TF_SHELL_USES; 576 setsig(&sigtraps[SIGWINCH], x_sigwinch, 577 SS_RESTORE_ORIG|SS_FORCE|SS_SHTRAP); 578 #endif 579 580 l = e->loc; 581 if (Flag(FAS_BUILTIN)) { 582 l->argc = argc; 583 l->argv = argv; 584 l->argv[0] = ccp; 585 } else { 586 l->argc = argc - argi; 587 /* 588 * allocate a new array because otherwise, when we modify 589 * it in-place, ps(1) output changes; the meaning of argc 590 * here is slightly different as it excludes kshname, and 591 * we add a trailing NULL sentinel as well 592 */ 593 l->argv = alloc2(l->argc + 2, sizeof(void *), APERM); 594 l->argv[0] = kshname; 595 memcpy(&l->argv[1], &argv[argi], l->argc * sizeof(void *)); 596 l->argv[l->argc + 1] = NULL; 597 getopts_reset(1); 598 } 599 600 /* divine the initial state of the utf8-mode Flag */ 601 ccp = null; 602 switch (utf_flag) { 603 604 /* auto-detect from locale or environment */ 605 case 4: 606 #if HAVE_SETLOCALE_CTYPE 607 ccp = setlocale(LC_CTYPE, ""); 608 #if HAVE_LANGINFO_CODESET 609 if (!isuc(ccp)) 610 ccp = nl_langinfo(CODESET); 611 #endif 612 if (!isuc(ccp)) 613 ccp = null; 614 #endif 615 /* FALLTHROUGH */ 616 617 /* auto-detect from environment */ 618 case 3: 619 /* these were imported from environ earlier */ 620 if (ccp == null) 621 ccp = str_val(global("LC_ALL")); 622 if (ccp == null) 623 ccp = str_val(global("LC_CTYPE")); 624 if (ccp == null) 625 ccp = str_val(global("LANG")); 626 UTFMODE = isuc(ccp); 627 break; 628 629 /* not set on command line, not FTALKING */ 630 case 2: 631 /* unknown values */ 632 default: 633 utf_flag = 0; 634 /* FALLTHROUGH */ 635 636 /* known values */ 637 case 1: 638 case 0: 639 UTFMODE = utf_flag; 640 break; 641 } 642 643 /* Disable during .profile/ENV reading */ 644 restricted_shell = Flag(FRESTRICTED); 645 Flag(FRESTRICTED) = 0; 646 errexit = Flag(FERREXIT); 647 Flag(FERREXIT) = 0; 648 649 /* 650 * Do this before profile/$ENV so that if it causes problems in them, 651 * user will know why things broke. 652 */ 653 if (!current_wd[0] && Flag(FTALKING)) 654 warningf(false, "can't determine current directory"); 655 656 if (Flag(FLOGIN)) 657 include(MKSH_SYSTEM_PROFILE, 0, NULL, true); 658 if (!Flag(FPRIVILEGED)) { 659 if (Flag(FLOGIN)) 660 include(substitute("$HOME/.profile", 0), 0, NULL, true); 661 if (Flag(FTALKING)) { 662 cp = substitute("${ENV:-" MKSHRC_PATH "}", DOTILDE); 663 if (cp[0] != '\0') 664 include(cp, 0, NULL, true); 665 } 666 } else { 667 include(MKSH_SUID_PROFILE, 0, NULL, true); 668 /* turn off -p if not set explicitly */ 669 if (Flag(FPRIVILEGED) != 1) 670 change_flag(FPRIVILEGED, OF_INTERNAL, false); 671 } 672 673 if (restricted_shell) { 674 c_builtin(restr_com); 675 /* After typeset command... */ 676 Flag(FRESTRICTED) = 1; 677 } 678 Flag(FERREXIT) = errexit; 679 680 if (Flag(FTALKING) && s) 681 hist_init(s); 682 else 683 /* set after ENV */ 684 Flag(FTRACKALL) = 1; 685 686 alarm_init(); 687 688 *sp = s; 689 *lp = l; 690 return (0); 691 } 692 693 /* this indirection barrier reduces stack usage during normal operation */ 694 695 int 696 main(int argc, const char *argv[]) 697 { 698 int rv; 699 Source *s; 700 struct block *l; 701 702 if ((rv = main_init(argc, argv, &s, &l)) == 0) { 703 if (Flag(FAS_BUILTIN)) { 704 rv = c_builtin(l->argv); 705 } else { 706 shell(s, 0); 707 /* NOTREACHED */ 708 } 709 } 710 return (rv); 711 } 712 713 int 714 include(const char *name, int argc, const char **argv, bool intr_ok) 715 { 716 Source *volatile s = NULL; 717 struct shf *shf; 718 const char **volatile old_argv; 719 volatile int old_argc; 720 int i; 721 722 shf = shf_open(name, O_RDONLY, 0, SHF_MAPHI | SHF_CLEXEC); 723 if (shf == NULL) 724 return (-1); 725 726 if (argv) { 727 old_argv = e->loc->argv; 728 old_argc = e->loc->argc; 729 } else { 730 old_argv = NULL; 731 old_argc = 0; 732 } 733 newenv(E_INCL); 734 if ((i = kshsetjmp(e->jbuf))) { 735 quitenv(s ? s->u.shf : NULL); 736 if (old_argv) { 737 e->loc->argv = old_argv; 738 e->loc->argc = old_argc; 739 } 740 switch (i) { 741 case LRETURN: 742 case LERROR: 743 /* see below */ 744 return (exstat & 0xFF); 745 case LINTR: 746 /* 747 * intr_ok is set if we are including .profile or $ENV. 748 * If user ^Cs out, we don't want to kill the shell... 749 */ 750 if (intr_ok && ((exstat & 0xFF) - 128) != SIGTERM) 751 return (1); 752 /* FALLTHROUGH */ 753 case LEXIT: 754 case LLEAVE: 755 case LSHELL: 756 unwind(i); 757 /* NOTREACHED */ 758 default: 759 internal_errorf(Tunexpected_type, Tunwind, Tsource, i); 760 /* NOTREACHED */ 761 } 762 } 763 if (argv) { 764 e->loc->argv = argv; 765 e->loc->argc = argc; 766 } 767 s = pushs(SFILE, ATEMP); 768 s->u.shf = shf; 769 strdupx(s->file, name, ATEMP); 770 i = shell(s, 1); 771 quitenv(s->u.shf); 772 if (old_argv) { 773 e->loc->argv = old_argv; 774 e->loc->argc = old_argc; 775 } 776 /* & 0xff to ensure value not -1 */ 777 return (i & 0xFF); 778 } 779 780 /* spawn a command into a shell optionally keeping track of the line number */ 781 int 782 command(const char *comm, int line) 783 { 784 Source *s, *sold = source; 785 int rv; 786 787 s = pushs(SSTRING, ATEMP); 788 s->start = s->str = comm; 789 s->line = line; 790 rv = shell(s, 1); 791 source = sold; 792 return (rv); 793 } 794 795 /* 796 * run the commands from the input source, returning status. 797 */ 798 int 799 shell(Source * volatile s, volatile int level) 800 { 801 struct op *t; 802 volatile bool wastty = tobool(s->flags & SF_TTY); 803 volatile uint8_t attempts = 13; 804 volatile bool interactive = (level == 0) && Flag(FTALKING); 805 volatile bool sfirst = true; 806 Source *volatile old_source = source; 807 int i; 808 809 newenv(level == 2 ? E_EVAL : E_PARSE); 810 if (interactive) 811 really_exit = false; 812 switch ((i = kshsetjmp(e->jbuf))) { 813 case 0: 814 break; 815 case LBREAK: 816 case LCONTIN: 817 if (level != 2) { 818 source = old_source; 819 quitenv(NULL); 820 internal_errorf(Tf_cant_s, Tshell, 821 i == LBREAK ? Tbreak : Tcontinue); 822 /* NOTREACHED */ 823 } 824 /* assert: interactive == false */ 825 /* FALLTHROUGH */ 826 case LINTR: 827 /* we get here if SIGINT not caught or ignored */ 828 case LERROR: 829 case LSHELL: 830 if (interactive) { 831 if (i == LINTR) 832 shellf("\n"); 833 /* 834 * Reset any eof that was read as part of a 835 * multiline command. 836 */ 837 if (Flag(FIGNOREEOF) && s->type == SEOF && wastty) 838 s->type = SSTDIN; 839 /* 840 * Used by exit command to get back to 841 * top level shell. Kind of strange since 842 * interactive is set if we are reading from 843 * a tty, but to have stopped jobs, one only 844 * needs FMONITOR set (not FTALKING/SF_TTY)... 845 */ 846 /* toss any input we have so far */ 847 yyrecursive_pop(true); 848 s->start = s->str = null; 849 retrace_info = NULL; 850 herep = heres; 851 break; 852 } 853 /* FALLTHROUGH */ 854 case LEXIT: 855 case LLEAVE: 856 case LRETURN: 857 source = old_source; 858 quitenv(NULL); 859 /* keep on going */ 860 unwind(i); 861 /* NOTREACHED */ 862 default: 863 source = old_source; 864 quitenv(NULL); 865 internal_errorf(Tunexpected_type, Tunwind, Tshell, i); 866 /* NOTREACHED */ 867 } 868 while (/* CONSTCOND */ 1) { 869 if (trap) 870 runtraps(0); 871 872 if (s->next == NULL) { 873 if (Flag(FVERBOSE)) 874 s->flags |= SF_ECHO; 875 else 876 s->flags &= ~SF_ECHO; 877 } 878 if (interactive) { 879 j_notify(); 880 set_prompt(PS1, s); 881 } 882 t = compile(s, sfirst, true); 883 if (interactive) 884 histsave(&s->line, NULL, HIST_FLUSH, true); 885 sfirst = false; 886 if (!t) 887 goto source_no_tree; 888 if (t->type == TEOF) { 889 if (wastty && Flag(FIGNOREEOF) && --attempts > 0) { 890 shellf("Use 'exit' to leave mksh\n"); 891 s->type = SSTDIN; 892 } else if (wastty && !really_exit && 893 j_stopped_running()) { 894 really_exit = true; 895 s->type = SSTDIN; 896 } else { 897 /* 898 * this for POSIX which says EXIT traps 899 * shall be taken in the environment 900 * immediately after the last command 901 * executed. 902 */ 903 if (level == 0) 904 unwind(LEXIT); 905 break; 906 } 907 } else if ((s->flags & SF_MAYEXEC) && t->type == TCOM) 908 t->u.evalflags |= DOTCOMEXEC; 909 if (!Flag(FNOEXEC) || (s->flags & SF_TTY)) 910 exstat = execute(t, 0, NULL) & 0xFF; 911 912 if (t->type != TEOF && interactive && really_exit) 913 really_exit = false; 914 915 source_no_tree: 916 reclaim(); 917 } 918 quitenv(NULL); 919 source = old_source; 920 return (exstat & 0xFF); 921 } 922 923 /* return to closest error handler or shell(), exit if none found */ 924 /* note: i MUST NOT be 0 */ 925 void 926 unwind(int i) 927 { 928 /* 929 * This is a kludge. We need to restore everything that was 930 * changed in the new environment, see cid 1005090337C7A669439 931 * and 10050903386452ACBF1, but fail to even save things most of 932 * the time. funcs.c:c_eval() changes FERREXIT temporarily to 0, 933 * which needs to be restored thus (related to Debian #696823). 934 * We did not save the shell flags, so we use a special or'd 935 * value here... this is mostly to clean up behind *other* 936 * callers of unwind(LERROR) here; exec.c has the regular case. 937 */ 938 if (Flag(FERREXIT) & 0x80) { 939 /* GNU bash does not run this trapsig */ 940 trapsig(ksh_SIGERR); 941 Flag(FERREXIT) &= ~0x80; 942 } 943 944 /* ordering for EXIT vs ERR is a bit odd (this is what AT&T ksh does) */ 945 if (i == LEXIT || ((i == LERROR || i == LINTR) && 946 sigtraps[ksh_SIGEXIT].trap && 947 (!Flag(FTALKING) || Flag(FERREXIT)))) { 948 ++trap_nested; 949 runtrap(&sigtraps[ksh_SIGEXIT], trap_nested == 1); 950 --trap_nested; 951 i = LLEAVE; 952 } else if (Flag(FERREXIT) == 1 && (i == LERROR || i == LINTR)) { 953 ++trap_nested; 954 runtrap(&sigtraps[ksh_SIGERR], trap_nested == 1); 955 --trap_nested; 956 i = LLEAVE; 957 } 958 959 while (/* CONSTCOND */ 1) { 960 switch (e->type) { 961 case E_PARSE: 962 case E_FUNC: 963 case E_INCL: 964 case E_LOOP: 965 case E_ERRH: 966 case E_EVAL: 967 kshlongjmp(e->jbuf, i); 968 /* NOTREACHED */ 969 case E_NONE: 970 if (i == LINTR) 971 e->flags |= EF_FAKE_SIGDIE; 972 /* FALLTHROUGH */ 973 default: 974 quitenv(NULL); 975 } 976 } 977 } 978 979 void 980 newenv(int type) 981 { 982 struct env *ep; 983 char *cp; 984 985 /* 986 * struct env includes ALLOC_ITEM for alignment constraints 987 * so first get the actually used memory, then assign it 988 */ 989 cp = alloc(sizeof(struct env) - sizeof(ALLOC_ITEM), ATEMP); 990 /* undo what alloc() did to the malloc result address */ 991 ep = (void *)(cp - sizeof(ALLOC_ITEM)); 992 /* initialise public members of struct env (not the ALLOC_ITEM) */ 993 ainit(&ep->area); 994 ep->oenv = e; 995 ep->loc = e->loc; 996 ep->savefd = NULL; 997 ep->temps = NULL; 998 ep->yyrecursive_statep = NULL; 999 ep->type = type; 1000 ep->flags = 0; 1001 /* jump buffer is invalid because flags == 0 */ 1002 e = ep; 1003 } 1004 1005 void 1006 quitenv(struct shf *shf) 1007 { 1008 struct env *ep = e; 1009 char *cp; 1010 int fd; 1011 1012 yyrecursive_pop(true); 1013 while (ep->oenv && ep->oenv->loc != ep->loc) 1014 popblock(); 1015 if (ep->savefd != NULL) { 1016 for (fd = 0; fd < NUFILE; fd++) 1017 /* if ep->savefd[fd] < 0, means fd was closed */ 1018 if (ep->savefd[fd]) 1019 restfd(fd, ep->savefd[fd]); 1020 if (ep->savefd[2]) 1021 /* Clear any write errors */ 1022 shf_reopen(2, SHF_WR, shl_out); 1023 } 1024 /* 1025 * Bottom of the stack. 1026 * Either main shell is exiting or cleanup_parents_env() was called. 1027 */ 1028 if (ep->oenv == NULL) { 1029 #ifdef DEBUG_LEAKS 1030 int i; 1031 #endif 1032 1033 if (ep->type == E_NONE) { 1034 /* Main shell exiting? */ 1035 #if HAVE_PERSISTENT_HISTORY 1036 if (Flag(FTALKING)) 1037 hist_finish(); 1038 #endif 1039 j_exit(); 1040 if (ep->flags & EF_FAKE_SIGDIE) { 1041 int sig = (exstat & 0xFF) - 128; 1042 1043 /* 1044 * ham up our death a bit (AT&T ksh 1045 * only seems to do this for SIGTERM) 1046 * Don't do it for SIGQUIT, since we'd 1047 * dump a core.. 1048 */ 1049 if ((sig == SIGINT || sig == SIGTERM) && 1050 (kshpgrp == kshpid)) { 1051 setsig(&sigtraps[sig], SIG_DFL, 1052 SS_RESTORE_CURR | SS_FORCE); 1053 kill(0, sig); 1054 } 1055 } 1056 } 1057 if (shf) 1058 shf_close(shf); 1059 reclaim(); 1060 #ifdef DEBUG_LEAKS 1061 #ifndef MKSH_NO_CMDLINE_EDITING 1062 x_done(); 1063 #endif 1064 #ifndef MKSH_NOPROSPECTOFWORK 1065 /* block at least SIGCHLD during/after afreeall */ 1066 sigprocmask(SIG_BLOCK, &sm_sigchld, NULL); 1067 #endif 1068 afreeall(APERM); 1069 for (fd = 3; fd < NUFILE; fd++) 1070 if ((i = fcntl(fd, F_GETFD, 0)) != -1 && 1071 (i & FD_CLOEXEC)) 1072 close(fd); 1073 close(2); 1074 close(1); 1075 close(0); 1076 #endif 1077 exit(exstat & 0xFF); 1078 } 1079 if (shf) 1080 shf_close(shf); 1081 reclaim(); 1082 1083 e = e->oenv; 1084 1085 /* free the struct env - tricky due to the ALLOC_ITEM inside */ 1086 cp = (void *)ep; 1087 afree(cp + sizeof(ALLOC_ITEM), ATEMP); 1088 } 1089 1090 /* Called after a fork to cleanup stuff left over from parents environment */ 1091 void 1092 cleanup_parents_env(void) 1093 { 1094 struct env *ep; 1095 int fd; 1096 1097 /* 1098 * Don't clean up temporary files - parent will probably need them. 1099 * Also, can't easily reclaim memory since variables, etc. could be 1100 * anywhere. 1101 */ 1102 1103 /* close all file descriptors hiding in savefd */ 1104 for (ep = e; ep; ep = ep->oenv) { 1105 if (ep->savefd) { 1106 for (fd = 0; fd < NUFILE; fd++) 1107 if (ep->savefd[fd] > 0) 1108 close(ep->savefd[fd]); 1109 afree(ep->savefd, &ep->area); 1110 ep->savefd = NULL; 1111 } 1112 #ifdef DEBUG_LEAKS 1113 if (ep->type != E_NONE) 1114 ep->type = E_GONE; 1115 #endif 1116 } 1117 #ifndef DEBUG_LEAKS 1118 e->oenv = NULL; 1119 #endif 1120 } 1121 1122 /* Called just before an execve cleanup stuff temporary files */ 1123 void 1124 cleanup_proc_env(void) 1125 { 1126 struct env *ep; 1127 1128 for (ep = e; ep; ep = ep->oenv) 1129 remove_temps(ep->temps); 1130 } 1131 1132 /* remove temp files and free ATEMP Area */ 1133 static void 1134 reclaim(void) 1135 { 1136 struct block *l; 1137 1138 while ((l = e->loc) && (!e->oenv || e->oenv->loc != l)) { 1139 e->loc = l->next; 1140 afreeall(&l->area); 1141 } 1142 1143 remove_temps(e->temps); 1144 e->temps = NULL; 1145 1146 /* 1147 * if the memory backing source is reclaimed, things 1148 * will end up badly when a function expecting it to 1149 * be valid is run; a NULL pointer is easily debugged 1150 */ 1151 if (source && source->areap == &e->area) 1152 source = NULL; 1153 afreeall(&e->area); 1154 } 1155 1156 static void 1157 remove_temps(struct temp *tp) 1158 { 1159 while (tp) { 1160 if (tp->pid == procpid) 1161 unlink(tp->tffn); 1162 tp = tp->next; 1163 } 1164 } 1165 1166 /* 1167 * Initialise tty_fd. Used for tracking the size of the terminal, 1168 * saving/resetting tty modes upon forground job completion, and 1169 * for setting up the tty process group. Return values: 1170 * 0 = got controlling tty 1171 * 1 = got terminal but no controlling tty 1172 * 2 = cannot find a terminal 1173 * 3 = cannot dup fd 1174 * 4 = cannot make fd close-on-exec 1175 * An existing tty_fd is cached if no "better" one could be found, 1176 * i.e. if tty_devtty was already set or the new would not set it. 1177 */ 1178 int 1179 tty_init_fd(void) 1180 { 1181 int fd, rv, eno = 0; 1182 bool do_close = false, is_devtty = true; 1183 1184 if (tty_devtty) { 1185 /* already got a tty which is /dev/tty */ 1186 return (0); 1187 } 1188 1189 #ifdef _UWIN 1190 /*XXX imake style */ 1191 if (isatty(3)) { 1192 /* fd 3 on UWIN _is_ /dev/tty (or our controlling tty) */ 1193 fd = 3; 1194 goto got_fd; 1195 } 1196 #endif 1197 if ((fd = open(T_devtty, O_RDWR, 0)) >= 0) { 1198 do_close = true; 1199 goto got_fd; 1200 } 1201 eno = errno; 1202 1203 if (tty_fd >= 0) { 1204 /* already got a non-devtty one */ 1205 rv = 1; 1206 goto out; 1207 } 1208 is_devtty = false; 1209 1210 if (isatty((fd = 0)) || isatty((fd = 2))) 1211 goto got_fd; 1212 /* cannot find one */ 1213 rv = 2; 1214 /* assert: do_close == false */ 1215 goto out; 1216 1217 got_fd: 1218 if ((rv = fcntl(fd, F_DUPFD, FDBASE)) < 0) { 1219 eno = errno; 1220 rv = 3; 1221 goto out; 1222 } 1223 if (fcntl(rv, F_SETFD, FD_CLOEXEC) < 0) { 1224 eno = errno; 1225 close(rv); 1226 rv = 4; 1227 goto out; 1228 } 1229 tty_fd = rv; 1230 tty_devtty = is_devtty; 1231 rv = eno = 0; 1232 out: 1233 if (do_close) 1234 close(fd); 1235 errno = eno; 1236 return (rv); 1237 } 1238 1239 /* A shell error occurred (eg, syntax error, etc.) */ 1240 1241 #define VWARNINGF_ERRORPREFIX 1 1242 #define VWARNINGF_FILELINE 2 1243 #define VWARNINGF_BUILTIN 4 1244 #define VWARNINGF_INTERNAL 8 1245 1246 static void vwarningf(unsigned int, const char *, va_list) 1247 MKSH_A_FORMAT(__printf__, 2, 0); 1248 1249 static void 1250 vwarningf(unsigned int flags, const char *fmt, va_list ap) 1251 { 1252 if (fmt) { 1253 if (flags & VWARNINGF_INTERNAL) 1254 shf_fprintf(shl_out, Tf_sD_, "internal error"); 1255 if (flags & VWARNINGF_ERRORPREFIX) 1256 error_prefix(tobool(flags & VWARNINGF_FILELINE)); 1257 if ((flags & VWARNINGF_BUILTIN) && 1258 /* not set when main() calls parse_args() */ 1259 builtin_argv0 && builtin_argv0 != kshname) 1260 shf_fprintf(shl_out, Tf_sD_, builtin_argv0); 1261 shf_vfprintf(shl_out, fmt, ap); 1262 shf_putchar('\n', shl_out); 1263 } 1264 shf_flush(shl_out); 1265 } 1266 1267 void 1268 errorfx(int rc, const char *fmt, ...) 1269 { 1270 va_list va; 1271 1272 exstat = rc; 1273 1274 /* debugging: note that stdout not valid */ 1275 shl_stdout_ok = false; 1276 1277 va_start(va, fmt); 1278 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va); 1279 va_end(va); 1280 unwind(LERROR); 1281 } 1282 1283 void 1284 errorf(const char *fmt, ...) 1285 { 1286 va_list va; 1287 1288 exstat = 1; 1289 1290 /* debugging: note that stdout not valid */ 1291 shl_stdout_ok = false; 1292 1293 va_start(va, fmt); 1294 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va); 1295 va_end(va); 1296 unwind(LERROR); 1297 } 1298 1299 /* like errorf(), but no unwind is done */ 1300 void 1301 warningf(bool fileline, const char *fmt, ...) 1302 { 1303 va_list va; 1304 1305 va_start(va, fmt); 1306 vwarningf(VWARNINGF_ERRORPREFIX | (fileline ? VWARNINGF_FILELINE : 0), 1307 fmt, va); 1308 va_end(va); 1309 } 1310 1311 /* 1312 * Used by built-in utilities to prefix shell and utility name to message 1313 * (also unwinds environments for special builtins). 1314 */ 1315 void 1316 bi_errorf(const char *fmt, ...) 1317 { 1318 va_list va; 1319 1320 /* debugging: note that stdout not valid */ 1321 shl_stdout_ok = false; 1322 1323 exstat = 1; 1324 1325 va_start(va, fmt); 1326 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE | 1327 VWARNINGF_BUILTIN, fmt, va); 1328 va_end(va); 1329 1330 /* POSIX special builtins cause non-interactive shells to exit */ 1331 if (builtin_spec) { 1332 builtin_argv0 = NULL; 1333 /* may not want to use LERROR here */ 1334 unwind(LERROR); 1335 } 1336 } 1337 1338 /* Called when something that shouldn't happen does */ 1339 void 1340 internal_errorf(const char *fmt, ...) 1341 { 1342 va_list va; 1343 1344 va_start(va, fmt); 1345 vwarningf(VWARNINGF_INTERNAL, fmt, va); 1346 va_end(va); 1347 unwind(LERROR); 1348 } 1349 1350 void 1351 internal_warningf(const char *fmt, ...) 1352 { 1353 va_list va; 1354 1355 va_start(va, fmt); 1356 vwarningf(VWARNINGF_INTERNAL, fmt, va); 1357 va_end(va); 1358 } 1359 1360 /* used by error reporting functions to print "ksh: .kshrc[25]: " */ 1361 void 1362 error_prefix(bool fileline) 1363 { 1364 /* Avoid foo: foo[2]: ... */ 1365 if (!fileline || !source || !source->file || 1366 strcmp(source->file, kshname) != 0) 1367 shf_fprintf(shl_out, Tf_sD_, kshname + (*kshname == '-')); 1368 if (fileline && source && source->file != NULL) { 1369 shf_fprintf(shl_out, "%s[%lu]: ", source->file, 1370 (unsigned long)(source->errline ? 1371 source->errline : source->line)); 1372 source->errline = 0; 1373 } 1374 } 1375 1376 /* printf to shl_out (stderr) with flush */ 1377 void 1378 shellf(const char *fmt, ...) 1379 { 1380 va_list va; 1381 1382 if (!initio_done) 1383 /* shl_out may not be set up yet... */ 1384 return; 1385 va_start(va, fmt); 1386 shf_vfprintf(shl_out, fmt, va); 1387 va_end(va); 1388 shf_flush(shl_out); 1389 } 1390 1391 /* printf to shl_stdout (stdout) */ 1392 void 1393 shprintf(const char *fmt, ...) 1394 { 1395 va_list va; 1396 1397 if (!shl_stdout_ok) 1398 internal_errorf("shl_stdout not valid"); 1399 va_start(va, fmt); 1400 shf_vfprintf(shl_stdout, fmt, va); 1401 va_end(va); 1402 } 1403 1404 /* test if we can seek backwards fd (returns 0 or SHF_UNBUF) */ 1405 int 1406 can_seek(int fd) 1407 { 1408 struct stat statb; 1409 1410 return (fstat(fd, &statb) == 0 && !S_ISREG(statb.st_mode) ? 1411 SHF_UNBUF : 0); 1412 } 1413 1414 #ifdef DF 1415 int shl_dbg_fd; 1416 #define NSHF_IOB 4 1417 #else 1418 #define NSHF_IOB 3 1419 #endif 1420 struct shf shf_iob[NSHF_IOB]; 1421 1422 void 1423 initio(void) 1424 { 1425 #ifdef DF 1426 const char *lfp; 1427 #endif 1428 1429 /* force buffer allocation */ 1430 shf_fdopen(1, SHF_WR, shl_stdout); 1431 shf_fdopen(2, SHF_WR, shl_out); 1432 shf_fdopen(2, SHF_WR, shl_xtrace); 1433 #ifdef DF 1434 if ((lfp = getenv("SDMKSH_PATH")) == NULL) { 1435 if ((lfp = getenv("HOME")) == NULL || !mksh_abspath(lfp)) 1436 errorf("can't get home directory"); 1437 lfp = shf_smprintf(Tf_sSs, lfp, "mksh-dbg.txt"); 1438 } 1439 1440 if ((shl_dbg_fd = open(lfp, O_WRONLY | O_APPEND | O_CREAT, 0600)) < 0) 1441 errorf("can't open debug output file %s", lfp); 1442 if (shl_dbg_fd < FDBASE) { 1443 int nfd; 1444 1445 nfd = fcntl(shl_dbg_fd, F_DUPFD, FDBASE); 1446 close(shl_dbg_fd); 1447 if ((shl_dbg_fd = nfd) == -1) 1448 errorf("can't dup debug output file"); 1449 } 1450 fcntl(shl_dbg_fd, F_SETFD, FD_CLOEXEC); 1451 shf_fdopen(shl_dbg_fd, SHF_WR, shl_dbg); 1452 DF("=== open ==="); 1453 #endif 1454 initio_done = true; 1455 } 1456 1457 /* A dup2() with error checking */ 1458 int 1459 ksh_dup2(int ofd, int nfd, bool errok) 1460 { 1461 int rv; 1462 1463 if (((rv = dup2(ofd, nfd)) < 0) && !errok && (errno != EBADF)) 1464 errorf(Ttoo_many_files); 1465 1466 #ifdef __ultrix 1467 /*XXX imake style */ 1468 if (rv >= 0) 1469 fcntl(nfd, F_SETFD, 0); 1470 #endif 1471 1472 return (rv); 1473 } 1474 1475 /* 1476 * Move fd from user space (0 <= fd < 10) to shell space (fd >= 10), 1477 * set close-on-exec flag. See FDBASE in sh.h, maybe 24 not 10 here. 1478 */ 1479 short 1480 savefd(int fd) 1481 { 1482 int nfd = fd; 1483 1484 if (fd < FDBASE && (nfd = fcntl(fd, F_DUPFD, FDBASE)) < 0 && 1485 (errno == EBADF || errno == EPERM)) 1486 return (-1); 1487 if (nfd < 0 || nfd > SHRT_MAX) 1488 errorf(Ttoo_many_files); 1489 fcntl(nfd, F_SETFD, FD_CLOEXEC); 1490 return ((short)nfd); 1491 } 1492 1493 void 1494 restfd(int fd, int ofd) 1495 { 1496 if (fd == 2) 1497 shf_flush(&shf_iob[/* fd */ 2]); 1498 if (ofd < 0) 1499 /* original fd closed */ 1500 close(fd); 1501 else if (fd != ofd) { 1502 /*XXX: what to do if this dup fails? */ 1503 ksh_dup2(ofd, fd, true); 1504 close(ofd); 1505 } 1506 } 1507 1508 void 1509 openpipe(int *pv) 1510 { 1511 int lpv[2]; 1512 1513 if (pipe(lpv) < 0) 1514 errorf("can't create pipe - try again"); 1515 pv[0] = savefd(lpv[0]); 1516 if (pv[0] != lpv[0]) 1517 close(lpv[0]); 1518 pv[1] = savefd(lpv[1]); 1519 if (pv[1] != lpv[1]) 1520 close(lpv[1]); 1521 #ifdef __OS2__ 1522 setmode(pv[0], O_BINARY); 1523 setmode(pv[1], O_BINARY); 1524 #endif 1525 } 1526 1527 void 1528 closepipe(int *pv) 1529 { 1530 close(pv[0]); 1531 close(pv[1]); 1532 } 1533 1534 /* 1535 * Called by iosetup() (deals with 2>&4, etc.), c_read, c_print to turn 1536 * a string (the X in 2>&X, read -uX, print -uX) into a file descriptor. 1537 */ 1538 int 1539 check_fd(const char *name, int mode, const char **emsgp) 1540 { 1541 int fd, fl; 1542 1543 if (!name[0] || name[1]) 1544 goto illegal_fd_name; 1545 if (name[0] == 'p') 1546 return (coproc_getfd(mode, emsgp)); 1547 if (!ctype(name[0], C_DIGIT)) { 1548 illegal_fd_name: 1549 if (emsgp) 1550 *emsgp = "illegal file descriptor name"; 1551 return (-1); 1552 } 1553 1554 if ((fl = fcntl((fd = ksh_numdig(name[0])), F_GETFL, 0)) < 0) { 1555 if (emsgp) 1556 *emsgp = "bad file descriptor"; 1557 return (-1); 1558 } 1559 fl &= O_ACCMODE; 1560 /* 1561 * X_OK is a kludge to disable this check for dups (x<&1): 1562 * historical shells never did this check (XXX don't know what 1563 * POSIX has to say). 1564 */ 1565 if (!(mode & X_OK) && fl != O_RDWR && ( 1566 ((mode & R_OK) && fl != O_RDONLY) || 1567 ((mode & W_OK) && fl != O_WRONLY))) { 1568 if (emsgp) 1569 *emsgp = (fl == O_WRONLY) ? 1570 "fd not open for reading" : 1571 "fd not open for writing"; 1572 return (-1); 1573 } 1574 return (fd); 1575 } 1576 1577 /* Called once from main */ 1578 void 1579 coproc_init(void) 1580 { 1581 coproc.read = coproc.readw = coproc.write = -1; 1582 coproc.njobs = 0; 1583 coproc.id = 0; 1584 } 1585 1586 /* Called by c_read() when eof is read - close fd if it is the co-process fd */ 1587 void 1588 coproc_read_close(int fd) 1589 { 1590 if (coproc.read >= 0 && fd == coproc.read) { 1591 coproc_readw_close(fd); 1592 close(coproc.read); 1593 coproc.read = -1; 1594 } 1595 } 1596 1597 /* 1598 * Called by c_read() and by iosetup() to close the other side of the 1599 * read pipe, so reads will actually terminate. 1600 */ 1601 void 1602 coproc_readw_close(int fd) 1603 { 1604 if (coproc.readw >= 0 && coproc.read >= 0 && fd == coproc.read) { 1605 close(coproc.readw); 1606 coproc.readw = -1; 1607 } 1608 } 1609 1610 /* 1611 * Called by c_print when a write to a fd fails with EPIPE and by iosetup 1612 * when co-process input is dup'd 1613 */ 1614 void 1615 coproc_write_close(int fd) 1616 { 1617 if (coproc.write >= 0 && fd == coproc.write) { 1618 close(coproc.write); 1619 coproc.write = -1; 1620 } 1621 } 1622 1623 /* 1624 * Called to check for existence of/value of the co-process file descriptor. 1625 * (Used by check_fd() and by c_read/c_print to deal with -p option). 1626 */ 1627 int 1628 coproc_getfd(int mode, const char **emsgp) 1629 { 1630 int fd = (mode & R_OK) ? coproc.read : coproc.write; 1631 1632 if (fd >= 0) 1633 return (fd); 1634 if (emsgp) 1635 *emsgp = "no coprocess"; 1636 return (-1); 1637 } 1638 1639 /* 1640 * called to close file descriptors related to the coprocess (if any) 1641 * Should be called with SIGCHLD blocked. 1642 */ 1643 void 1644 coproc_cleanup(int reuse) 1645 { 1646 /* This to allow co-processes to share output pipe */ 1647 if (!reuse || coproc.readw < 0 || coproc.read < 0) { 1648 if (coproc.read >= 0) { 1649 close(coproc.read); 1650 coproc.read = -1; 1651 } 1652 if (coproc.readw >= 0) { 1653 close(coproc.readw); 1654 coproc.readw = -1; 1655 } 1656 } 1657 if (coproc.write >= 0) { 1658 close(coproc.write); 1659 coproc.write = -1; 1660 } 1661 } 1662 1663 struct temp * 1664 maketemp(Area *ap, Temp_type type, struct temp **tlist) 1665 { 1666 char *cp; 1667 size_t len; 1668 int i, j; 1669 struct temp *tp; 1670 const char *dir; 1671 struct stat sb; 1672 1673 dir = tmpdir ? tmpdir : MKSH_DEFAULT_TMPDIR; 1674 /* add "/shXXXXXX.tmp" plus NUL */ 1675 len = strlen(dir); 1676 checkoktoadd(len, offsetof(struct temp, tffn[0]) + 14); 1677 tp = alloc(offsetof(struct temp, tffn[0]) + 14 + len, ap); 1678 1679 tp->shf = NULL; 1680 tp->pid = procpid; 1681 tp->type = type; 1682 1683 if (stat(dir, &sb) || !S_ISDIR(sb.st_mode)) { 1684 tp->tffn[0] = '\0'; 1685 goto maketemp_out; 1686 } 1687 1688 cp = (void *)tp; 1689 cp += offsetof(struct temp, tffn[0]); 1690 memcpy(cp, dir, len); 1691 cp += len; 1692 memcpy(cp, "/shXXXXXX.tmp", 14); 1693 /* point to the first of six Xes */ 1694 cp += 3; 1695 1696 /* cyclically attempt to open a temporary file */ 1697 do { 1698 /* generate random part of filename */ 1699 len = 0; 1700 do { 1701 cp[len++] = digits_lc[rndget() % 36]; 1702 } while (len < 6); 1703 1704 /* check if this one works */ 1705 if ((i = binopen3(tp->tffn, O_CREAT | O_EXCL | O_RDWR, 1706 0600)) < 0 && errno != EEXIST) 1707 goto maketemp_out; 1708 } while (i < 0); 1709 1710 if (type == TT_FUNSUB) { 1711 /* map us high and mark as close-on-exec */ 1712 if ((j = savefd(i)) != i) { 1713 close(i); 1714 i = j; 1715 } 1716 1717 /* operation mode for the shf */ 1718 j = SHF_RD; 1719 } else 1720 j = SHF_WR; 1721 1722 /* shf_fdopen cannot fail, so no fd leak */ 1723 tp->shf = shf_fdopen(i, j, NULL); 1724 1725 maketemp_out: 1726 tp->next = *tlist; 1727 *tlist = tp; 1728 return (tp); 1729 } 1730 1731 /* 1732 * We use a similar collision resolution algorithm as Python 2.5.4 1733 * but with a slightly tweaked implementation written from scratch. 1734 */ 1735 1736 #define INIT_TBLSHIFT 3 /* initial table shift (2^3 = 8) */ 1737 #define PERTURB_SHIFT 5 /* see Python 2.5.4 Objects/dictobject.c */ 1738 1739 static void tgrow(struct table *); 1740 static int tnamecmp(const void *, const void *); 1741 1742 static void 1743 tgrow(struct table *tp) 1744 { 1745 size_t i, j, osize, mask, perturb; 1746 struct tbl *tblp, **pp; 1747 struct tbl **ntblp, **otblp = tp->tbls; 1748 1749 if (tp->tshift > 29) 1750 internal_errorf("hash table size limit reached"); 1751 1752 /* calculate old size, new shift and new size */ 1753 osize = (size_t)1 << (tp->tshift++); 1754 i = osize << 1; 1755 1756 ntblp = alloc2(i, sizeof(struct tbl *), tp->areap); 1757 /* multiplication cannot overflow: alloc2 checked that */ 1758 memset(ntblp, 0, i * sizeof(struct tbl *)); 1759 1760 /* table can get very full when reaching its size limit */ 1761 tp->nfree = (tp->tshift == 30) ? 0x3FFF0000UL : 1762 /* but otherwise, only 75% */ 1763 ((i * 3) / 4); 1764 tp->tbls = ntblp; 1765 if (otblp == NULL) 1766 return; 1767 1768 mask = i - 1; 1769 for (i = 0; i < osize; i++) 1770 if ((tblp = otblp[i]) != NULL) { 1771 if ((tblp->flag & DEFINED)) { 1772 /* search for free hash table slot */ 1773 j = perturb = tblp->ua.hval; 1774 goto find_first_empty_slot; 1775 find_next_empty_slot: 1776 j = (j << 2) + j + perturb + 1; 1777 perturb >>= PERTURB_SHIFT; 1778 find_first_empty_slot: 1779 pp = &ntblp[j & mask]; 1780 if (*pp != NULL) 1781 goto find_next_empty_slot; 1782 /* found an empty hash table slot */ 1783 *pp = tblp; 1784 tp->nfree--; 1785 } else if (!(tblp->flag & FINUSE)) { 1786 afree(tblp, tp->areap); 1787 } 1788 } 1789 afree(otblp, tp->areap); 1790 } 1791 1792 void 1793 ktinit(Area *ap, struct table *tp, uint8_t initshift) 1794 { 1795 tp->areap = ap; 1796 tp->tbls = NULL; 1797 tp->tshift = ((initshift > INIT_TBLSHIFT) ? 1798 initshift : INIT_TBLSHIFT) - 1; 1799 tgrow(tp); 1800 } 1801 1802 /* table, name (key) to search for, hash(name), rv pointer to tbl ptr */ 1803 struct tbl * 1804 ktscan(struct table *tp, const char *name, uint32_t h, struct tbl ***ppp) 1805 { 1806 size_t j, perturb, mask; 1807 struct tbl **pp, *p; 1808 1809 mask = ((size_t)1 << (tp->tshift)) - 1; 1810 /* search for hash table slot matching name */ 1811 j = perturb = h; 1812 goto find_first_slot; 1813 find_next_slot: 1814 j = (j << 2) + j + perturb + 1; 1815 perturb >>= PERTURB_SHIFT; 1816 find_first_slot: 1817 pp = &tp->tbls[j & mask]; 1818 if ((p = *pp) != NULL && (p->ua.hval != h || !(p->flag & DEFINED) || 1819 strcmp(p->name, name))) 1820 goto find_next_slot; 1821 /* p == NULL if not found, correct found entry otherwise */ 1822 if (ppp) 1823 *ppp = pp; 1824 return (p); 1825 } 1826 1827 /* table, name (key) to enter, hash(n) */ 1828 struct tbl * 1829 ktenter(struct table *tp, const char *n, uint32_t h) 1830 { 1831 struct tbl **pp, *p; 1832 size_t len; 1833 1834 Search: 1835 if ((p = ktscan(tp, n, h, &pp))) 1836 return (p); 1837 1838 if (tp->nfree == 0) { 1839 /* too full */ 1840 tgrow(tp); 1841 goto Search; 1842 } 1843 1844 /* create new tbl entry */ 1845 len = strlen(n); 1846 checkoktoadd(len, offsetof(struct tbl, name[0]) + 1); 1847 p = alloc(offsetof(struct tbl, name[0]) + ++len, tp->areap); 1848 p->flag = 0; 1849 p->type = 0; 1850 p->areap = tp->areap; 1851 p->ua.hval = h; 1852 p->u2.field = 0; 1853 p->u.array = NULL; 1854 memcpy(p->name, n, len); 1855 1856 /* enter in tp->tbls */ 1857 tp->nfree--; 1858 *pp = p; 1859 return (p); 1860 } 1861 1862 void 1863 ktwalk(struct tstate *ts, struct table *tp) 1864 { 1865 ts->left = (size_t)1 << (tp->tshift); 1866 ts->next = tp->tbls; 1867 } 1868 1869 struct tbl * 1870 ktnext(struct tstate *ts) 1871 { 1872 while (--ts->left >= 0) { 1873 struct tbl *p = *ts->next++; 1874 if (p != NULL && (p->flag & DEFINED)) 1875 return (p); 1876 } 1877 return (NULL); 1878 } 1879 1880 static int 1881 tnamecmp(const void *p1, const void *p2) 1882 { 1883 const struct tbl *a = *((const struct tbl * const *)p1); 1884 const struct tbl *b = *((const struct tbl * const *)p2); 1885 1886 return (ascstrcmp(a->name, b->name)); 1887 } 1888 1889 struct tbl ** 1890 ktsort(struct table *tp) 1891 { 1892 size_t i; 1893 struct tbl **p, **sp, **dp; 1894 1895 /* 1896 * since the table is never entirely full, no need to reserve 1897 * additional space for the trailing NULL appended below 1898 */ 1899 i = (size_t)1 << (tp->tshift); 1900 p = alloc2(i, sizeof(struct tbl *), ATEMP); 1901 sp = tp->tbls; /* source */ 1902 dp = p; /* dest */ 1903 while (i--) 1904 if ((*dp = *sp++) != NULL && (((*dp)->flag & DEFINED) || 1905 ((*dp)->flag & ARRAY))) 1906 dp++; 1907 qsort(p, (i = dp - p), sizeof(struct tbl *), tnamecmp); 1908 p[i] = NULL; 1909 return (p); 1910 } 1911 1912 #ifdef SIGWINCH 1913 static void 1914 x_sigwinch(int sig MKSH_A_UNUSED) 1915 { 1916 /* this runs inside interrupt context, with errno saved */ 1917 1918 got_winch = 1; 1919 } 1920 #endif 1921 1922 #ifdef DF 1923 void 1924 DF(const char *fmt, ...) 1925 { 1926 va_list args; 1927 struct timeval tv; 1928 mirtime_mjd mjd; 1929 1930 mksh_lockfd(shl_dbg_fd); 1931 mksh_TIME(tv); 1932 timet2mjd(&mjd, tv.tv_sec); 1933 shf_fprintf(shl_dbg, "[%02u:%02u:%02u (%u) %u.%06u] ", 1934 (unsigned)mjd.sec / 3600, ((unsigned)mjd.sec / 60) % 60, 1935 (unsigned)mjd.sec % 60, (unsigned)getpid(), 1936 (unsigned)tv.tv_sec, (unsigned)tv.tv_usec); 1937 va_start(args, fmt); 1938 shf_vfprintf(shl_dbg, fmt, args); 1939 va_end(args); 1940 shf_putc('\n', shl_dbg); 1941 shf_flush(shl_dbg); 1942 mksh_unlkfd(shl_dbg_fd); 1943 } 1944 #endif 1945 1946 void 1947 x_mkraw(int fd, mksh_ttyst *ocb, bool forread) 1948 { 1949 mksh_ttyst cb; 1950 1951 if (ocb) 1952 mksh_tcget(fd, ocb); 1953 else 1954 ocb = &tty_state; 1955 1956 cb = *ocb; 1957 if (forread) { 1958 cb.c_iflag &= ~(ISTRIP); 1959 cb.c_lflag &= ~(ICANON) | ECHO; 1960 } else { 1961 cb.c_iflag &= ~(INLCR | ICRNL | ISTRIP); 1962 cb.c_lflag &= ~(ISIG | ICANON | ECHO); 1963 } 1964 #if defined(VLNEXT) && defined(_POSIX_VDISABLE) 1965 /* OSF/1 processes lnext when ~icanon */ 1966 cb.c_cc[VLNEXT] = _POSIX_VDISABLE; 1967 #endif 1968 /* SunOS 4.1.x & OSF/1 processes discard(flush) when ~icanon */ 1969 #if defined(VDISCARD) && defined(_POSIX_VDISABLE) 1970 cb.c_cc[VDISCARD] = _POSIX_VDISABLE; 1971 #endif 1972 cb.c_cc[VTIME] = 0; 1973 cb.c_cc[VMIN] = 1; 1974 1975 mksh_tcset(fd, &cb); 1976 } 1977 1978 #ifdef MKSH_ENVDIR 1979 static void 1980 init_environ(void) 1981 { 1982 char *xp; 1983 ssize_t n; 1984 XString xs; 1985 struct shf *shf; 1986 DIR *dirp; 1987 struct dirent *dent; 1988 1989 if ((dirp = opendir(MKSH_ENVDIR)) == NULL) { 1990 warningf(false, "cannot read environment from %s: %s", 1991 MKSH_ENVDIR, cstrerror(errno)); 1992 return; 1993 } 1994 XinitN(xs, 256, ATEMP); 1995 read_envfile: 1996 errno = 0; 1997 if ((dent = readdir(dirp)) != NULL) { 1998 if (skip_varname(dent->d_name, true)[0] == '\0') { 1999 xp = shf_smprintf(Tf_sSs, MKSH_ENVDIR, dent->d_name); 2000 if (!(shf = shf_open(xp, O_RDONLY, 0, 0))) { 2001 warningf(false, 2002 "cannot read environment %s from %s: %s", 2003 dent->d_name, MKSH_ENVDIR, 2004 cstrerror(errno)); 2005 goto read_envfile; 2006 } 2007 afree(xp, ATEMP); 2008 n = strlen(dent->d_name); 2009 xp = Xstring(xs, xp); 2010 XcheckN(xs, xp, n + 32); 2011 memcpy(xp, dent->d_name, n); 2012 xp += n; 2013 *xp++ = '='; 2014 while ((n = shf_read(xp, Xnleft(xs, xp), shf)) > 0) { 2015 xp += n; 2016 if (Xnleft(xs, xp) <= 0) 2017 XcheckN(xs, xp, Xlength(xs, xp)); 2018 } 2019 if (n < 0) { 2020 warningf(false, 2021 "cannot read environment %s from %s: %s", 2022 dent->d_name, MKSH_ENVDIR, 2023 cstrerror(shf_errno(shf))); 2024 } else { 2025 *xp = '\0'; 2026 xp = Xstring(xs, xp); 2027 rndpush(xp); 2028 typeset(xp, IMPORT | EXPORT, 0, 0, 0); 2029 } 2030 shf_close(shf); 2031 } 2032 goto read_envfile; 2033 } else if (errno) 2034 warningf(false, "cannot read environment from %s: %s", 2035 MKSH_ENVDIR, cstrerror(errno)); 2036 closedir(dirp); 2037 Xfree(xs, xp); 2038 } 2039 #else 2040 extern char **environ; 2041 2042 static void 2043 init_environ(void) 2044 { 2045 const char **wp; 2046 2047 if (environ == NULL) 2048 return; 2049 2050 wp = (const char **)environ; 2051 while (*wp != NULL) { 2052 rndpush(*wp); 2053 typeset(*wp, IMPORT | EXPORT, 0, 0, 0); 2054 ++wp; 2055 } 2056 } 2057 #endif 2058 2059 #ifdef MKSH_EARLY_LOCALE_TRACKING 2060 void 2061 recheck_ctype(void) 2062 { 2063 const char *ccp; 2064 2065 ccp = str_val(global("LC_ALL")); 2066 if (ccp == null) 2067 ccp = str_val(global("LC_CTYPE")); 2068 if (ccp == null) 2069 ccp = str_val(global("LANG")); 2070 UTFMODE = isuc(ccp); 2071 #if HAVE_SETLOCALE_CTYPE 2072 ccp = setlocale(LC_CTYPE, ccp); 2073 #if HAVE_LANGINFO_CODESET 2074 if (!isuc(ccp)) 2075 ccp = nl_langinfo(CODESET); 2076 #endif 2077 if (isuc(ccp)) 2078 UTFMODE = 1; 2079 #endif 2080 2081 if (Flag(FPOSIX)) 2082 warningf(true, "early locale tracking enabled UTF-8 mode while in POSIX mode, you are now noncompliant"); 2083 } 2084 #endif 2085
