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 * 2019 10 * mirabilos <m (at) mirbsd.org> 11 * 12 * Provided that these terms and disclaimer and all copyright notices 13 * are retained or reproduced in an accompanying document, permission 14 * is granted to deal in this work without restriction, including un- 15 * limited rights to use, publicly perform, distribute, sell, modify, 16 * merge, give away, or sublicence. 17 * 18 * This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to 19 * the utmost extent permitted by applicable law, neither express nor 20 * implied; without malicious intent or gross negligence. In no event 21 * may a licensor, author or contributor be held liable for indirect, 22 * direct, other damage, loss, or other issues arising in any way out 23 * of dealing in the work, even if advised of the possibility of such 24 * damage or existence of a defect, except proven that it results out 25 * of said person's immediate fault when using the work as intended. 26 */ 27 28 #define EXTERN 29 #include "sh.h" 30 31 #if HAVE_LANGINFO_CODESET 32 #include <langinfo.h> 33 #endif 34 #if HAVE_SETLOCALE_CTYPE 35 #include <locale.h> 36 #endif 37 38 __RCSID("$MirOS: src/bin/mksh/main.c,v 1.351 2019/01/05 13:24:18 tg Exp $"); 39 40 #ifndef MKSHRC_PATH 41 #define MKSHRC_PATH "~/.mkshrc" 42 #endif 43 44 #ifndef MKSH_DEFAULT_TMPDIR 45 #define MKSH_DEFAULT_TMPDIR MKSH_UNIXROOT "/tmp" 46 #endif 47 48 static uint8_t isuc(const char *); 49 static int main_init(int, const char *[], Source **, struct block **); 50 void chvt_reinit(void); 51 static void reclaim(void); 52 static void remove_temps(struct temp *); 53 static mksh_uari_t rndsetup(void); 54 static void init_environ(void); 55 #ifdef SIGWINCH 56 static void x_sigwinch(int); 57 #endif 58 59 static const char initsubs[] = 60 "${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 #if defined(MKSH_EBCDIC) || defined(MKSH_FAUX_EBCDIC) 240 ebcdic_init(); 241 #endif 242 set_ifs(TC_IFSWS); 243 244 #ifdef __OS2__ 245 os2_init(&argc, &argv); 246 #endif 247 248 /* do things like getpgrp() et al. */ 249 chvt_reinit(); 250 251 /* make sure argv[] is sane, for weird OSes */ 252 if (!*argv) { 253 argv = empty_argv; 254 argc = 1; 255 } 256 kshname = argv[0]; 257 258 /* initialise permanent Area */ 259 ainit(&aperm); 260 /* max. name length: -2147483648 = 11 (+ NUL) */ 261 vtemp = alloc(offsetof(struct tbl, name[0]) + 12, APERM); 262 263 /* set up base environment */ 264 env.type = E_NONE; 265 ainit(&env.area); 266 /* set up global l->vars and l->funs */ 267 newblock(); 268 269 /* Do this first so output routines (eg, errorf, shellf) can work */ 270 initio(); 271 272 /* determine the basename (without '-' or path) of the executable */ 273 ccp = kshname; 274 goto begin_parsing_kshname; 275 while ((i = ccp[argi++])) { 276 if (mksh_cdirsep(i)) { 277 ccp += argi; 278 begin_parsing_kshname: 279 argi = 0; 280 if (*ccp == '-') 281 ++ccp; 282 } 283 } 284 if (!*ccp) 285 ccp = empty_argv[0]; 286 287 /* 288 * Turn on nohup by default. (AT&T ksh does not have a nohup 289 * option - it always sends the hup). 290 */ 291 Flag(FNOHUP) = 1; 292 293 /* 294 * Turn on brace expansion by default. AT&T kshs that have 295 * alternation always have it on. 296 */ 297 Flag(FBRACEEXPAND) = 1; 298 299 /* 300 * Turn on "set -x" inheritance by default. 301 */ 302 Flag(FXTRACEREC) = 1; 303 304 /* define built-in commands and see if we were called as one */ 305 ktinit(APERM, &builtins, 306 /* currently up to 54 builtins: 75% of 128 = 2^7 */ 307 7); 308 for (i = 0; mkshbuiltins[i].name != NULL; i++) 309 if (!strcmp(ccp, builtin(mkshbuiltins[i].name, 310 mkshbuiltins[i].func))) 311 Flag(FAS_BUILTIN) = 1; 312 313 if (!Flag(FAS_BUILTIN)) { 314 /* check for -T option early */ 315 argi = parse_args(argv, OF_FIRSTTIME, NULL); 316 if (argi < 0) 317 return (1); 318 319 #if defined(MKSH_BINSHPOSIX) || defined(MKSH_BINSHREDUCED) 320 /* are we called as -sh or /bin/sh or so? */ 321 if (!strcmp(ccp, "sh" MKSH_EXE_EXT)) { 322 /* either also turns off braceexpand */ 323 #ifdef MKSH_BINSHPOSIX 324 /* enable better POSIX conformance */ 325 change_flag(FPOSIX, OF_FIRSTTIME, true); 326 #endif 327 #ifdef MKSH_BINSHREDUCED 328 /* enable kludge/compat mode */ 329 change_flag(FSH, OF_FIRSTTIME, true); 330 #endif 331 } 332 #endif 333 } 334 335 initvar(); 336 337 inittraps(); 338 339 coproc_init(); 340 341 /* set up variable and command dictionaries */ 342 ktinit(APERM, &taliases, 0); 343 ktinit(APERM, &aliases, 0); 344 #ifndef MKSH_NOPWNAM 345 ktinit(APERM, &homedirs, 0); 346 #endif 347 348 /* define shell keywords */ 349 initkeywords(); 350 351 init_histvec(); 352 353 /* initialise tty size before importing environment */ 354 change_winsz(); 355 356 #ifdef _PATH_DEFPATH 357 def_path = _PATH_DEFPATH; 358 #else 359 #ifdef _CS_PATH 360 if ((k = confstr(_CS_PATH, NULL, 0)) > 0 && 361 confstr(_CS_PATH, cp = alloc(k + 1, APERM), k + 1) == k + 1) 362 def_path = cp; 363 else 364 #endif 365 /* 366 * this is uniform across all OSes unless it 367 * breaks somewhere hard; don't try to optimise, 368 * e.g. add stuff for Interix or remove /usr 369 * for HURD, because e.g. Debian GNU/HURD is 370 * "keeping a regular /usr"; this is supposed 371 * to be a sane 'basic' default PATH 372 */ 373 def_path = MKSH_UNIXROOT "/bin" MKSH_PATHSEPS 374 MKSH_UNIXROOT "/usr/bin" MKSH_PATHSEPS 375 MKSH_UNIXROOT "/sbin" MKSH_PATHSEPS 376 MKSH_UNIXROOT "/usr/sbin"; 377 #endif 378 379 /* 380 * Set PATH to def_path (will set the path global variable). 381 * (import of environment below will probably change this setting). 382 */ 383 vp = global(TPATH); 384 /* setstr can't fail here */ 385 setstr(vp, def_path, KSH_RETURN_ERROR); 386 387 #ifndef MKSH_NO_CMDLINE_EDITING 388 /* 389 * Set edit mode to emacs by default, may be overridden 390 * by the environment or the user. Also, we want tab completion 391 * on in vi by default. 392 */ 393 change_flag(FEMACS, OF_SPECIAL, true); 394 #if !MKSH_S_NOVI 395 Flag(FVITABCOMPLETE) = 1; 396 #endif 397 #endif 398 399 /* import environment */ 400 init_environ(); 401 402 /* override default PATH regardless of environment */ 403 #ifdef MKSH_DEFPATH_OVERRIDE 404 vp = global(TPATH); 405 setstr(vp, MKSH_DEFPATH_OVERRIDE, KSH_RETURN_ERROR); 406 #endif 407 408 /* for security */ 409 typeset(TinitIFS, 0, 0, 0, 0); 410 411 /* assign default shell variable values */ 412 typeset("PATHSEP=" MKSH_PATHSEPS, 0, 0, 0, 0); 413 substitute(initsubs, 0); 414 415 /* Figure out the current working directory and set $PWD */ 416 vp = global(TPWD); 417 cp = str_val(vp); 418 /* Try to use existing $PWD if it is valid */ 419 set_current_wd((mksh_abspath(cp) && test_eval(NULL, TO_FILEQ, cp, 420 Tdot, true)) ? cp : NULL); 421 if (current_wd[0]) 422 simplify_path(current_wd); 423 /* Only set pwd if we know where we are or if it had a bogus value */ 424 if (current_wd[0] || *cp) 425 /* setstr can't fail here */ 426 setstr(vp, current_wd, KSH_RETURN_ERROR); 427 428 for (wp = initcoms; *wp != NULL; wp++) { 429 c_builtin(wp); 430 while (*wp != NULL) 431 wp++; 432 } 433 setint_n(global("OPTIND"), 1, 10); 434 435 kshuid = getuid(); 436 kshgid = getgid(); 437 kshegid = getegid(); 438 439 safe_prompt = ksheuid ? "$ " : "# "; 440 vp = global("PS1"); 441 /* Set PS1 if unset or we are root and prompt doesn't contain a # */ 442 if (!(vp->flag & ISSET) || 443 (!ksheuid && !strchr(str_val(vp), '#'))) 444 /* setstr can't fail here */ 445 setstr(vp, safe_prompt, KSH_RETURN_ERROR); 446 setint_n((vp = global("BASHPID")), 0, 10); 447 vp->flag |= INT_U; 448 setint_n((vp = global("PGRP")), (mksh_uari_t)kshpgrp, 10); 449 vp->flag |= INT_U; 450 setint_n((vp = global("PPID")), (mksh_uari_t)kshppid, 10); 451 vp->flag |= INT_U; 452 setint_n((vp = global("USER_ID")), (mksh_uari_t)ksheuid, 10); 453 vp->flag |= INT_U; 454 setint_n((vp = global("KSHUID")), (mksh_uari_t)kshuid, 10); 455 vp->flag |= INT_U; 456 setint_n((vp = global("KSHEGID")), (mksh_uari_t)kshegid, 10); 457 vp->flag |= INT_U; 458 setint_n((vp = global("KSHGID")), (mksh_uari_t)kshgid, 10); 459 vp->flag |= INT_U; 460 setint_n((vp = global("RANDOM")), rndsetup(), 10); 461 vp->flag |= INT_U; 462 setint_n((vp_pipest = global("PIPESTATUS")), 0, 10); 463 464 /* Set this before parsing arguments */ 465 Flag(FPRIVILEGED) = (kshuid != ksheuid || kshgid != kshegid) ? 2 : 0; 466 467 /* record if monitor is set on command line (see j_init() in jobs.c) */ 468 #ifndef MKSH_UNEMPLOYED 469 Flag(FMONITOR) = 127; 470 #endif 471 /* this to note if utf-8 mode is set on command line (see below) */ 472 UTFMODE = 2; 473 474 if (!Flag(FAS_BUILTIN)) { 475 argi = parse_args(argv, OF_CMDLINE, NULL); 476 if (argi < 0) 477 return (1); 478 } 479 480 /* process this later only, default to off (hysterical raisins) */ 481 utf_flag = UTFMODE; 482 UTFMODE = 0; 483 484 if (Flag(FAS_BUILTIN)) { 485 /* auto-detect from environment variables, always */ 486 utf_flag = 3; 487 } else if (Flag(FCOMMAND)) { 488 s = pushs(SSTRINGCMDLINE, ATEMP); 489 if (!(s->start = s->str = argv[argi++])) 490 errorf(Tf_optfoo, "", "", 'c', Treq_arg); 491 while (*s->str) { 492 if (ctype(*s->str, C_QUOTE)) 493 break; 494 s->str++; 495 } 496 if (!*s->str) 497 s->flags |= SF_MAYEXEC; 498 s->str = s->start; 499 #ifdef MKSH_MIDNIGHTBSD01ASH_COMPAT 500 /* compatibility to MidnightBSD 0.1 /bin/sh (kludge) */ 501 if (Flag(FSH) && argv[argi] && !strcmp(argv[argi], "--")) 502 ++argi; 503 #endif 504 if (argv[argi]) 505 kshname = argv[argi++]; 506 } else if (argi < argc && !Flag(FSTDIN)) { 507 s = pushs(SFILE, ATEMP); 508 #ifdef __OS2__ 509 /* 510 * A bug in OS/2 extproc (like shebang) handling makes 511 * it not pass the full pathname of a script, so we need 512 * to search for it. This changes the behaviour of a 513 * simple "mksh foo", but can't be helped. 514 */ 515 s->file = argv[argi++]; 516 if (search_access(s->file, X_OK) != 0) 517 s->file = search_path(s->file, path, X_OK, NULL); 518 if (!s->file || !*s->file) 519 s->file = argv[argi - 1]; 520 #else 521 s->file = argv[argi++]; 522 #endif 523 s->u.shf = shf_open(s->file, O_RDONLY | O_MAYEXEC, 0, 524 SHF_MAPHI | SHF_CLEXEC); 525 if (s->u.shf == NULL) { 526 shl_stdout_ok = false; 527 warningf(true, Tf_sD_s, s->file, cstrerror(errno)); 528 /* mandated by SUSv4 */ 529 exstat = 127; 530 unwind(LERROR); 531 } 532 kshname = s->file; 533 } else { 534 Flag(FSTDIN) = 1; 535 s = pushs(SSTDIN, ATEMP); 536 s->file = "<stdin>"; 537 s->u.shf = shf_fdopen(0, SHF_RD | can_seek(0), 538 NULL); 539 if (isatty(0) && isatty(2)) { 540 Flag(FTALKING) = Flag(FTALKING_I) = 1; 541 /* The following only if isatty(0) */ 542 s->flags |= SF_TTY; 543 s->u.shf->flags |= SHF_INTERRUPT; 544 s->file = NULL; 545 } 546 } 547 548 /* this bizarreness is mandated by POSIX */ 549 if (fstat(0, &s_stdin) >= 0 && S_ISCHR(s_stdin.st_mode) && 550 Flag(FTALKING)) 551 reset_nonblock(0); 552 553 /* initialise job control */ 554 j_init(); 555 /* do this after j_init() which calls tty_init_state() */ 556 if (Flag(FTALKING)) { 557 if (utf_flag == 2) { 558 #ifndef MKSH_ASSUME_UTF8 559 /* auto-detect from locale or environment */ 560 utf_flag = 4; 561 #else /* this may not be an #elif */ 562 #if MKSH_ASSUME_UTF8 563 utf_flag = 1; 564 #else 565 /* always disable UTF-8 (for interactive) */ 566 utf_flag = 0; 567 #endif 568 #endif 569 } 570 #ifndef MKSH_NO_CMDLINE_EDITING 571 x_init(); 572 #endif 573 } 574 575 #ifdef SIGWINCH 576 sigtraps[SIGWINCH].flags |= TF_SHELL_USES; 577 setsig(&sigtraps[SIGWINCH], x_sigwinch, 578 SS_RESTORE_ORIG|SS_FORCE|SS_SHTRAP); 579 #endif 580 581 l = e->loc; 582 if (Flag(FAS_BUILTIN)) { 583 l->argc = argc; 584 l->argv = argv; 585 l->argv[0] = ccp; 586 } else { 587 l->argc = argc - argi; 588 /* 589 * allocate a new array because otherwise, when we modify 590 * it in-place, ps(1) output changes; the meaning of argc 591 * here is slightly different as it excludes kshname, and 592 * we add a trailing NULL sentinel as well 593 */ 594 l->argv = alloc2(l->argc + 2, sizeof(void *), APERM); 595 l->argv[0] = kshname; 596 memcpy(&l->argv[1], &argv[argi], l->argc * sizeof(void *)); 597 l->argv[l->argc + 1] = NULL; 598 getopts_reset(1); 599 } 600 601 /* divine the initial state of the utf8-mode Flag */ 602 ccp = null; 603 switch (utf_flag) { 604 605 /* auto-detect from locale or environment */ 606 case 4: 607 #if HAVE_SETLOCALE_CTYPE 608 ccp = setlocale(LC_CTYPE, ""); 609 #if HAVE_LANGINFO_CODESET 610 if (!isuc(ccp)) 611 ccp = nl_langinfo(CODESET); 612 #endif 613 if (!isuc(ccp)) 614 ccp = null; 615 #endif 616 /* FALLTHROUGH */ 617 618 /* auto-detect from environment */ 619 case 3: 620 /* these were imported from environ earlier */ 621 if (ccp == null) 622 ccp = str_val(global("LC_ALL")); 623 if (ccp == null) 624 ccp = str_val(global("LC_CTYPE")); 625 if (ccp == null) 626 ccp = str_val(global("LANG")); 627 UTFMODE = isuc(ccp); 628 break; 629 630 /* not set on command line, not FTALKING */ 631 case 2: 632 /* unknown values */ 633 default: 634 utf_flag = 0; 635 /* FALLTHROUGH */ 636 637 /* known values */ 638 case 1: 639 case 0: 640 UTFMODE = utf_flag; 641 break; 642 } 643 644 /* Disable during .profile/ENV reading */ 645 restricted_shell = Flag(FRESTRICTED); 646 Flag(FRESTRICTED) = 0; 647 errexit = Flag(FERREXIT); 648 Flag(FERREXIT) = 0; 649 650 /* 651 * Do this before profile/$ENV so that if it causes problems in them, 652 * user will know why things broke. 653 */ 654 if (!current_wd[0] && Flag(FTALKING)) 655 warningf(false, "can't determine current directory"); 656 657 if (Flag(FLOGIN)) 658 include(MKSH_SYSTEM_PROFILE, 0, NULL, true); 659 if (!Flag(FPRIVILEGED)) { 660 if (Flag(FLOGIN)) 661 include(substitute("$HOME/.profile", 0), 0, NULL, true); 662 if (Flag(FTALKING)) { 663 cp = substitute("${ENV:-" MKSHRC_PATH "}", DOTILDE); 664 if (cp[0] != '\0') 665 include(cp, 0, NULL, true); 666 } 667 } else { 668 include(MKSH_SUID_PROFILE, 0, NULL, true); 669 /* turn off -p if not set explicitly */ 670 if (Flag(FPRIVILEGED) != 1) 671 change_flag(FPRIVILEGED, OF_INTERNAL, false); 672 } 673 674 if (restricted_shell) { 675 c_builtin(restr_com); 676 /* After typeset command... */ 677 Flag(FRESTRICTED) = 1; 678 } 679 Flag(FERREXIT) = errexit; 680 681 if (Flag(FTALKING) && s) 682 hist_init(s); 683 else 684 /* set after ENV */ 685 Flag(FTRACKALL) = 1; 686 687 alarm_init(); 688 689 *sp = s; 690 *lp = l; 691 return (0); 692 } 693 694 /* this indirection barrier reduces stack usage during normal operation */ 695 696 int 697 main(int argc, const char *argv[]) 698 { 699 int rv; 700 Source *s; 701 struct block *l; 702 703 if ((rv = main_init(argc, argv, &s, &l)) == 0) { 704 if (Flag(FAS_BUILTIN)) { 705 rv = c_builtin(l->argv); 706 } else { 707 shell(s, 0); 708 /* NOTREACHED */ 709 } 710 } 711 return (rv); 712 } 713 714 int 715 include(const char *name, int argc, const char **argv, bool intr_ok) 716 { 717 Source *volatile s = NULL; 718 struct shf *shf; 719 const char **volatile old_argv; 720 volatile int old_argc; 721 int i; 722 723 shf = shf_open(name, O_RDONLY | O_MAYEXEC, 0, SHF_MAPHI | SHF_CLEXEC); 724 if (shf == NULL) 725 return (-1); 726 727 if (argv) { 728 old_argv = e->loc->argv; 729 old_argc = e->loc->argc; 730 } else { 731 old_argv = NULL; 732 old_argc = 0; 733 } 734 newenv(E_INCL); 735 if ((i = kshsetjmp(e->jbuf))) { 736 quitenv(s ? s->u.shf : NULL); 737 if (old_argv) { 738 e->loc->argv = old_argv; 739 e->loc->argc = old_argc; 740 } 741 switch (i) { 742 case LRETURN: 743 case LERROR: 744 /* see below */ 745 return (exstat & 0xFF); 746 case LINTR: 747 /* 748 * intr_ok is set if we are including .profile or $ENV. 749 * If user ^Cs out, we don't want to kill the shell... 750 */ 751 if (intr_ok && ((exstat & 0xFF) - 128) != SIGTERM) 752 return (1); 753 /* FALLTHROUGH */ 754 case LEXIT: 755 case LLEAVE: 756 case LSHELL: 757 unwind(i); 758 /* NOTREACHED */ 759 default: 760 internal_errorf(Tunexpected_type, Tunwind, Tsource, i); 761 /* NOTREACHED */ 762 } 763 } 764 if (argv) { 765 e->loc->argv = argv; 766 e->loc->argc = argc; 767 } 768 s = pushs(SFILE, ATEMP); 769 s->u.shf = shf; 770 strdupx(s->file, name, ATEMP); 771 i = shell(s, 1); 772 quitenv(s->u.shf); 773 if (old_argv) { 774 e->loc->argv = old_argv; 775 e->loc->argc = old_argc; 776 } 777 /* & 0xff to ensure value not -1 */ 778 return (i & 0xFF); 779 } 780 781 /* spawn a command into a shell optionally keeping track of the line number */ 782 int 783 command(const char *comm, int line) 784 { 785 Source *s, *sold = source; 786 int rv; 787 788 s = pushs(SSTRING, ATEMP); 789 s->start = s->str = comm; 790 s->line = line; 791 rv = shell(s, 1); 792 source = sold; 793 return (rv); 794 } 795 796 /* 797 * run the commands from the input source, returning status. 798 */ 799 int 800 shell(Source * volatile s, volatile int level) 801 { 802 struct op *t; 803 volatile bool wastty = tobool(s->flags & SF_TTY); 804 volatile uint8_t attempts = 13; 805 volatile bool interactive = (level == 0) && Flag(FTALKING); 806 volatile bool sfirst = true; 807 Source *volatile old_source = source; 808 int i; 809 810 newenv(level == 2 ? E_EVAL : E_PARSE); 811 if (interactive) 812 really_exit = false; 813 switch ((i = kshsetjmp(e->jbuf))) { 814 case 0: 815 break; 816 case LBREAK: 817 case LCONTIN: 818 if (level != 2) { 819 source = old_source; 820 quitenv(NULL); 821 internal_errorf(Tf_cant_s, Tshell, 822 i == LBREAK ? Tbreak : Tcontinue); 823 /* NOTREACHED */ 824 } 825 /* assert: interactive == false */ 826 /* FALLTHROUGH */ 827 case LINTR: 828 /* we get here if SIGINT not caught or ignored */ 829 case LERROR: 830 case LSHELL: 831 if (interactive) { 832 if (i == LINTR) 833 shellf("\n"); 834 /* 835 * Reset any eof that was read as part of a 836 * multiline command. 837 */ 838 if (Flag(FIGNOREEOF) && s->type == SEOF && wastty) 839 s->type = SSTDIN; 840 /* 841 * Used by exit command to get back to 842 * top level shell. Kind of strange since 843 * interactive is set if we are reading from 844 * a tty, but to have stopped jobs, one only 845 * needs FMONITOR set (not FTALKING/SF_TTY)... 846 */ 847 /* toss any input we have so far */ 848 yyrecursive_pop(true); 849 s->start = s->str = null; 850 retrace_info = NULL; 851 herep = heres; 852 break; 853 } 854 /* FALLTHROUGH */ 855 case LEXIT: 856 case LLEAVE: 857 case LRETURN: 858 source = old_source; 859 quitenv(NULL); 860 /* keep on going */ 861 unwind(i); 862 /* NOTREACHED */ 863 default: 864 source = old_source; 865 quitenv(NULL); 866 internal_errorf(Tunexpected_type, Tunwind, Tshell, i); 867 /* NOTREACHED */ 868 } 869 while (/* CONSTCOND */ 1) { 870 if (trap) 871 runtraps(0); 872 873 if (s->next == NULL) { 874 if (Flag(FVERBOSE)) 875 s->flags |= SF_ECHO; 876 else 877 s->flags &= ~SF_ECHO; 878 } 879 if (interactive) { 880 j_notify(); 881 set_prompt(PS1, s); 882 } 883 t = compile(s, sfirst, true); 884 if (interactive) 885 histsave(&s->line, NULL, HIST_FLUSH, true); 886 sfirst = false; 887 if (!t) 888 goto source_no_tree; 889 if (t->type == TEOF) { 890 if (wastty && Flag(FIGNOREEOF) && --attempts > 0) { 891 shellf("Use 'exit' to leave mksh\n"); 892 s->type = SSTDIN; 893 } else if (wastty && !really_exit && 894 j_stopped_running()) { 895 really_exit = true; 896 s->type = SSTDIN; 897 } else { 898 /* 899 * this for POSIX which says EXIT traps 900 * shall be taken in the environment 901 * immediately after the last command 902 * executed. 903 */ 904 if (level == 0) 905 unwind(LEXIT); 906 break; 907 } 908 } else if ((s->flags & SF_MAYEXEC) && t->type == TCOM) 909 t->u.evalflags |= DOTCOMEXEC; 910 if (!Flag(FNOEXEC) || (s->flags & SF_TTY)) 911 exstat = execute(t, 0, NULL) & 0xFF; 912 913 if (t->type != TEOF && interactive && really_exit) 914 really_exit = false; 915 916 source_no_tree: 917 reclaim(); 918 } 919 quitenv(NULL); 920 source = old_source; 921 return (exstat & 0xFF); 922 } 923 924 /* return to closest error handler or shell(), exit if none found */ 925 /* note: i MUST NOT be 0 */ 926 void 927 unwind(int i) 928 { 929 /* 930 * This is a kludge. We need to restore everything that was 931 * changed in the new environment, see cid 1005090337C7A669439 932 * and 10050903386452ACBF1, but fail to even save things most of 933 * the time. funcs.c:c_eval() changes FERREXIT temporarily to 0, 934 * which needs to be restored thus (related to Debian #696823). 935 * We did not save the shell flags, so we use a special or'd 936 * value here... this is mostly to clean up behind *other* 937 * callers of unwind(LERROR) here; exec.c has the regular case. 938 */ 939 if (Flag(FERREXIT) & 0x80) { 940 /* GNU bash does not run this trapsig */ 941 trapsig(ksh_SIGERR); 942 Flag(FERREXIT) &= ~0x80; 943 } 944 945 /* ordering for EXIT vs ERR is a bit odd (this is what AT&T ksh does) */ 946 if (i == LEXIT || ((i == LERROR || i == LINTR) && 947 sigtraps[ksh_SIGEXIT].trap && 948 (!Flag(FTALKING) || Flag(FERREXIT)))) { 949 ++trap_nested; 950 runtrap(&sigtraps[ksh_SIGEXIT], trap_nested == 1); 951 --trap_nested; 952 i = LLEAVE; 953 } else if (Flag(FERREXIT) == 1 && (i == LERROR || i == LINTR)) { 954 ++trap_nested; 955 runtrap(&sigtraps[ksh_SIGERR], trap_nested == 1); 956 --trap_nested; 957 i = LLEAVE; 958 } 959 960 while (/* CONSTCOND */ 1) { 961 switch (e->type) { 962 case E_PARSE: 963 case E_FUNC: 964 case E_INCL: 965 case E_LOOP: 966 case E_ERRH: 967 case E_EVAL: 968 kshlongjmp(e->jbuf, i); 969 /* NOTREACHED */ 970 case E_NONE: 971 if (i == LINTR) 972 e->flags |= EF_FAKE_SIGDIE; 973 /* FALLTHROUGH */ 974 default: 975 quitenv(NULL); 976 } 977 } 978 } 979 980 void 981 newenv(int type) 982 { 983 struct env *ep; 984 char *cp; 985 986 /* 987 * struct env includes ALLOC_ITEM for alignment constraints 988 * so first get the actually used memory, then assign it 989 */ 990 cp = alloc(sizeof(struct env) - sizeof(ALLOC_ITEM), ATEMP); 991 /* undo what alloc() did to the malloc result address */ 992 ep = (void *)(cp - sizeof(ALLOC_ITEM)); 993 /* initialise public members of struct env (not the ALLOC_ITEM) */ 994 ainit(&ep->area); 995 ep->oenv = e; 996 ep->loc = e->loc; 997 ep->savefd = NULL; 998 ep->temps = NULL; 999 ep->yyrecursive_statep = NULL; 1000 ep->type = type; 1001 ep->flags = 0; 1002 /* jump buffer is invalid because flags == 0 */ 1003 e = ep; 1004 } 1005 1006 void 1007 quitenv(struct shf *shf) 1008 { 1009 struct env *ep = e; 1010 char *cp; 1011 int fd; 1012 1013 yyrecursive_pop(true); 1014 while (ep->oenv && ep->oenv->loc != ep->loc) 1015 popblock(); 1016 if (ep->savefd != NULL) { 1017 for (fd = 0; fd < NUFILE; fd++) 1018 /* if ep->savefd[fd] < 0, means fd was closed */ 1019 if (ep->savefd[fd]) 1020 restfd(fd, ep->savefd[fd]); 1021 if (ep->savefd[2]) 1022 /* Clear any write errors */ 1023 shf_reopen(2, SHF_WR, shl_out); 1024 } 1025 /* 1026 * Bottom of the stack. 1027 * Either main shell is exiting or cleanup_parents_env() was called. 1028 */ 1029 if (ep->oenv == NULL) { 1030 #ifdef DEBUG_LEAKS 1031 int i; 1032 #endif 1033 1034 if (ep->type == E_NONE) { 1035 /* Main shell exiting? */ 1036 #if HAVE_PERSISTENT_HISTORY 1037 if (Flag(FTALKING)) 1038 hist_finish(); 1039 #endif 1040 j_exit(); 1041 if (ep->flags & EF_FAKE_SIGDIE) { 1042 int sig = (exstat & 0xFF) - 128; 1043 1044 /* 1045 * ham up our death a bit (AT&T ksh 1046 * only seems to do this for SIGTERM) 1047 * Don't do it for SIGQUIT, since we'd 1048 * dump a core.. 1049 */ 1050 if ((sig == SIGINT || sig == SIGTERM) && 1051 (kshpgrp == kshpid)) { 1052 setsig(&sigtraps[sig], SIG_DFL, 1053 SS_RESTORE_CURR | SS_FORCE); 1054 kill(0, sig); 1055 } 1056 } 1057 } 1058 if (shf) 1059 shf_close(shf); 1060 reclaim(); 1061 #ifdef DEBUG_LEAKS 1062 #ifndef MKSH_NO_CMDLINE_EDITING 1063 x_done(); 1064 #endif 1065 #ifndef MKSH_NOPROSPECTOFWORK 1066 /* block at least SIGCHLD during/after afreeall */ 1067 sigprocmask(SIG_BLOCK, &sm_sigchld, NULL); 1068 #endif 1069 afreeall(APERM); 1070 for (fd = 3; fd < NUFILE; fd++) 1071 if ((i = fcntl(fd, F_GETFD, 0)) != -1 && 1072 (i & FD_CLOEXEC)) 1073 close(fd); 1074 close(2); 1075 close(1); 1076 close(0); 1077 #endif 1078 exit(exstat & 0xFF); 1079 } 1080 if (shf) 1081 shf_close(shf); 1082 reclaim(); 1083 1084 e = e->oenv; 1085 1086 /* free the struct env - tricky due to the ALLOC_ITEM inside */ 1087 cp = (void *)ep; 1088 afree(cp + sizeof(ALLOC_ITEM), ATEMP); 1089 } 1090 1091 /* Called after a fork to cleanup stuff left over from parents environment */ 1092 void 1093 cleanup_parents_env(void) 1094 { 1095 struct env *ep; 1096 int fd; 1097 1098 /* 1099 * Don't clean up temporary files - parent will probably need them. 1100 * Also, can't easily reclaim memory since variables, etc. could be 1101 * anywhere. 1102 */ 1103 1104 /* close all file descriptors hiding in savefd */ 1105 for (ep = e; ep; ep = ep->oenv) { 1106 if (ep->savefd) { 1107 for (fd = 0; fd < NUFILE; fd++) 1108 if (ep->savefd[fd] > 0) 1109 close(ep->savefd[fd]); 1110 afree(ep->savefd, &ep->area); 1111 ep->savefd = NULL; 1112 } 1113 #ifdef DEBUG_LEAKS 1114 if (ep->type != E_NONE) 1115 ep->type = E_GONE; 1116 #endif 1117 } 1118 #ifndef DEBUG_LEAKS 1119 e->oenv = NULL; 1120 #endif 1121 } 1122 1123 /* Called just before an execve cleanup stuff temporary files */ 1124 void 1125 cleanup_proc_env(void) 1126 { 1127 struct env *ep; 1128 1129 for (ep = e; ep; ep = ep->oenv) 1130 remove_temps(ep->temps); 1131 } 1132 1133 /* remove temp files and free ATEMP Area */ 1134 static void 1135 reclaim(void) 1136 { 1137 struct block *l; 1138 1139 while ((l = e->loc) && (!e->oenv || e->oenv->loc != l)) { 1140 e->loc = l->next; 1141 afreeall(&l->area); 1142 } 1143 1144 remove_temps(e->temps); 1145 e->temps = NULL; 1146 1147 /* 1148 * if the memory backing source is reclaimed, things 1149 * will end up badly when a function expecting it to 1150 * be valid is run; a NULL pointer is easily debugged 1151 */ 1152 if (source && source->areap == &e->area) 1153 source = NULL; 1154 afreeall(&e->area); 1155 } 1156 1157 static void 1158 remove_temps(struct temp *tp) 1159 { 1160 while (tp) { 1161 if (tp->pid == procpid) 1162 unlink(tp->tffn); 1163 tp = tp->next; 1164 } 1165 } 1166 1167 /* 1168 * Initialise tty_fd. Used for tracking the size of the terminal, 1169 * saving/resetting tty modes upon forground job completion, and 1170 * for setting up the tty process group. Return values: 1171 * 0 = got controlling tty 1172 * 1 = got terminal but no controlling tty 1173 * 2 = cannot find a terminal 1174 * 3 = cannot dup fd 1175 * 4 = cannot make fd close-on-exec 1176 * An existing tty_fd is cached if no "better" one could be found, 1177 * i.e. if tty_devtty was already set or the new would not set it. 1178 */ 1179 int 1180 tty_init_fd(void) 1181 { 1182 int fd, rv, eno = 0; 1183 bool do_close = false, is_devtty = true; 1184 1185 if (tty_devtty) { 1186 /* already got a tty which is /dev/tty */ 1187 return (0); 1188 } 1189 1190 #ifdef _UWIN 1191 /*XXX imake style */ 1192 if (isatty(3)) { 1193 /* fd 3 on UWIN _is_ /dev/tty (or our controlling tty) */ 1194 fd = 3; 1195 goto got_fd; 1196 } 1197 #endif 1198 if ((fd = open(T_devtty, O_RDWR, 0)) >= 0) { 1199 do_close = true; 1200 goto got_fd; 1201 } 1202 eno = errno; 1203 1204 if (tty_fd >= 0) { 1205 /* already got a non-devtty one */ 1206 rv = 1; 1207 goto out; 1208 } 1209 is_devtty = false; 1210 1211 if (isatty((fd = 0)) || isatty((fd = 2))) 1212 goto got_fd; 1213 /* cannot find one */ 1214 rv = 2; 1215 /* assert: do_close == false */ 1216 goto out; 1217 1218 got_fd: 1219 if ((rv = fcntl(fd, F_DUPFD, FDBASE)) < 0) { 1220 eno = errno; 1221 rv = 3; 1222 goto out; 1223 } 1224 if (fcntl(rv, F_SETFD, FD_CLOEXEC) < 0) { 1225 eno = errno; 1226 close(rv); 1227 rv = 4; 1228 goto out; 1229 } 1230 tty_fd = rv; 1231 tty_devtty = is_devtty; 1232 rv = eno = 0; 1233 out: 1234 if (do_close) 1235 close(fd); 1236 errno = eno; 1237 return (rv); 1238 } 1239 1240 /* A shell error occurred (eg, syntax error, etc.) */ 1241 1242 #define VWARNINGF_ERRORPREFIX 1 1243 #define VWARNINGF_FILELINE 2 1244 #define VWARNINGF_BUILTIN 4 1245 #define VWARNINGF_INTERNAL 8 1246 1247 static void vwarningf(unsigned int, const char *, va_list) 1248 MKSH_A_FORMAT(__printf__, 2, 0); 1249 1250 static void 1251 vwarningf(unsigned int flags, const char *fmt, va_list ap) 1252 { 1253 if (fmt) { 1254 if (flags & VWARNINGF_INTERNAL) 1255 shf_fprintf(shl_out, Tf_sD_, "internal error"); 1256 if (flags & VWARNINGF_ERRORPREFIX) 1257 error_prefix(tobool(flags & VWARNINGF_FILELINE)); 1258 if ((flags & VWARNINGF_BUILTIN) && 1259 /* not set when main() calls parse_args() */ 1260 builtin_argv0 && builtin_argv0 != kshname) 1261 shf_fprintf(shl_out, Tf_sD_, builtin_argv0); 1262 shf_vfprintf(shl_out, fmt, ap); 1263 shf_putchar('\n', shl_out); 1264 } 1265 shf_flush(shl_out); 1266 } 1267 1268 void 1269 errorfx(int rc, const char *fmt, ...) 1270 { 1271 va_list va; 1272 1273 exstat = rc; 1274 1275 /* debugging: note that stdout not valid */ 1276 shl_stdout_ok = false; 1277 1278 va_start(va, fmt); 1279 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va); 1280 va_end(va); 1281 unwind(LERROR); 1282 } 1283 1284 void 1285 errorf(const char *fmt, ...) 1286 { 1287 va_list va; 1288 1289 exstat = 1; 1290 1291 /* debugging: note that stdout not valid */ 1292 shl_stdout_ok = false; 1293 1294 va_start(va, fmt); 1295 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va); 1296 va_end(va); 1297 unwind(LERROR); 1298 } 1299 1300 /* like errorf(), but no unwind is done */ 1301 void 1302 warningf(bool fileline, const char *fmt, ...) 1303 { 1304 va_list va; 1305 1306 va_start(va, fmt); 1307 vwarningf(VWARNINGF_ERRORPREFIX | (fileline ? VWARNINGF_FILELINE : 0), 1308 fmt, va); 1309 va_end(va); 1310 } 1311 1312 /* 1313 * Used by built-in utilities to prefix shell and utility name to message 1314 * (also unwinds environments for special builtins). 1315 */ 1316 void 1317 bi_errorf(const char *fmt, ...) 1318 { 1319 va_list va; 1320 1321 /* debugging: note that stdout not valid */ 1322 shl_stdout_ok = false; 1323 1324 exstat = 1; 1325 1326 va_start(va, fmt); 1327 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE | 1328 VWARNINGF_BUILTIN, fmt, va); 1329 va_end(va); 1330 1331 /* POSIX special builtins cause non-interactive shells to exit */ 1332 if (builtin_spec) { 1333 builtin_argv0 = NULL; 1334 /* may not want to use LERROR here */ 1335 unwind(LERROR); 1336 } 1337 } 1338 1339 /* Called when something that shouldn't happen does */ 1340 void 1341 internal_errorf(const char *fmt, ...) 1342 { 1343 va_list va; 1344 1345 va_start(va, fmt); 1346 vwarningf(VWARNINGF_INTERNAL, fmt, va); 1347 va_end(va); 1348 unwind(LERROR); 1349 } 1350 1351 void 1352 internal_warningf(const char *fmt, ...) 1353 { 1354 va_list va; 1355 1356 va_start(va, fmt); 1357 vwarningf(VWARNINGF_INTERNAL, fmt, va); 1358 va_end(va); 1359 } 1360 1361 /* used by error reporting functions to print "ksh: .kshrc[25]: " */ 1362 void 1363 error_prefix(bool fileline) 1364 { 1365 /* Avoid foo: foo[2]: ... */ 1366 if (!fileline || !source || !source->file || 1367 strcmp(source->file, kshname) != 0) 1368 shf_fprintf(shl_out, Tf_sD_, kshname + (*kshname == '-')); 1369 if (fileline && source && source->file != NULL) { 1370 shf_fprintf(shl_out, "%s[%lu]: ", source->file, 1371 (unsigned long)(source->errline ? 1372 source->errline : source->line)); 1373 source->errline = 0; 1374 } 1375 } 1376 1377 /* printf to shl_out (stderr) with flush */ 1378 void 1379 shellf(const char *fmt, ...) 1380 { 1381 va_list va; 1382 1383 if (!initio_done) 1384 /* shl_out may not be set up yet... */ 1385 return; 1386 va_start(va, fmt); 1387 shf_vfprintf(shl_out, fmt, va); 1388 va_end(va); 1389 shf_flush(shl_out); 1390 } 1391 1392 /* printf to shl_stdout (stdout) */ 1393 void 1394 shprintf(const char *fmt, ...) 1395 { 1396 va_list va; 1397 1398 if (!shl_stdout_ok) 1399 internal_errorf("shl_stdout not valid"); 1400 va_start(va, fmt); 1401 shf_vfprintf(shl_stdout, fmt, va); 1402 va_end(va); 1403 } 1404 1405 /* test if we can seek backwards fd (returns 0 or SHF_UNBUF) */ 1406 int 1407 can_seek(int fd) 1408 { 1409 struct stat statb; 1410 1411 return (fstat(fd, &statb) == 0 && !S_ISREG(statb.st_mode) ? 1412 SHF_UNBUF : 0); 1413 } 1414 1415 #ifdef DF 1416 int shl_dbg_fd; 1417 #define NSHF_IOB 4 1418 #else 1419 #define NSHF_IOB 3 1420 #endif 1421 struct shf shf_iob[NSHF_IOB]; 1422 1423 void 1424 initio(void) 1425 { 1426 #ifdef DF 1427 const char *lfp; 1428 #endif 1429 1430 /* force buffer allocation */ 1431 shf_fdopen(1, SHF_WR, shl_stdout); 1432 shf_fdopen(2, SHF_WR, shl_out); 1433 shf_fdopen(2, SHF_WR, shl_xtrace); 1434 #ifdef DF 1435 if ((lfp = getenv("SDMKSH_PATH")) == NULL) { 1436 if ((lfp = getenv("HOME")) == NULL || !mksh_abspath(lfp)) 1437 errorf("can't get home directory"); 1438 lfp = shf_smprintf(Tf_sSs, lfp, "mksh-dbg.txt"); 1439 } 1440 1441 if ((shl_dbg_fd = open(lfp, O_WRONLY | O_APPEND | O_CREAT, 0600)) < 0) 1442 errorf("can't open debug output file %s", lfp); 1443 if (shl_dbg_fd < FDBASE) { 1444 int nfd; 1445 1446 nfd = fcntl(shl_dbg_fd, F_DUPFD, FDBASE); 1447 close(shl_dbg_fd); 1448 if ((shl_dbg_fd = nfd) == -1) 1449 errorf("can't dup debug output file"); 1450 } 1451 fcntl(shl_dbg_fd, F_SETFD, FD_CLOEXEC); 1452 shf_fdopen(shl_dbg_fd, SHF_WR, shl_dbg); 1453 DF("=== open ==="); 1454 #endif 1455 initio_done = true; 1456 } 1457 1458 /* A dup2() with error checking */ 1459 int 1460 ksh_dup2(int ofd, int nfd, bool errok) 1461 { 1462 int rv; 1463 1464 if (((rv = dup2(ofd, nfd)) < 0) && !errok && (errno != EBADF)) 1465 errorf(Ttoo_many_files); 1466 1467 #ifdef __ultrix 1468 /*XXX imake style */ 1469 if (rv >= 0) 1470 fcntl(nfd, F_SETFD, 0); 1471 #endif 1472 1473 return (rv); 1474 } 1475 1476 /* 1477 * Move fd from user space (0 <= fd < 10) to shell space (fd >= 10), 1478 * set close-on-exec flag. See FDBASE in sh.h, maybe 24 not 10 here. 1479 */ 1480 short 1481 savefd(int fd) 1482 { 1483 int nfd = fd; 1484 1485 if (fd < FDBASE && (nfd = fcntl(fd, F_DUPFD, FDBASE)) < 0 && 1486 (errno == EBADF || errno == EPERM)) 1487 return (-1); 1488 if (nfd < 0 || nfd > SHRT_MAX) 1489 errorf(Ttoo_many_files); 1490 fcntl(nfd, F_SETFD, FD_CLOEXEC); 1491 return ((short)nfd); 1492 } 1493 1494 void 1495 restfd(int fd, int ofd) 1496 { 1497 if (fd == 2) 1498 shf_flush(&shf_iob[/* fd */ 2]); 1499 if (ofd < 0) 1500 /* original fd closed */ 1501 close(fd); 1502 else if (fd != ofd) { 1503 /*XXX: what to do if this dup fails? */ 1504 ksh_dup2(ofd, fd, true); 1505 close(ofd); 1506 } 1507 } 1508 1509 void 1510 openpipe(int *pv) 1511 { 1512 int lpv[2]; 1513 1514 if (pipe(lpv) < 0) 1515 errorf("can't create pipe - try again"); 1516 pv[0] = savefd(lpv[0]); 1517 if (pv[0] != lpv[0]) 1518 close(lpv[0]); 1519 pv[1] = savefd(lpv[1]); 1520 if (pv[1] != lpv[1]) 1521 close(lpv[1]); 1522 #ifdef __OS2__ 1523 setmode(pv[0], O_BINARY); 1524 setmode(pv[1], O_BINARY); 1525 #endif 1526 } 1527 1528 void 1529 closepipe(int *pv) 1530 { 1531 close(pv[0]); 1532 close(pv[1]); 1533 } 1534 1535 /* 1536 * Called by iosetup() (deals with 2>&4, etc.), c_read, c_print to turn 1537 * a string (the X in 2>&X, read -uX, print -uX) into a file descriptor. 1538 */ 1539 int 1540 check_fd(const char *name, int mode, const char **emsgp) 1541 { 1542 int fd, fl; 1543 1544 if (!name[0] || name[1]) 1545 goto illegal_fd_name; 1546 if (name[0] == 'p') 1547 return (coproc_getfd(mode, emsgp)); 1548 if (!ctype(name[0], C_DIGIT)) { 1549 illegal_fd_name: 1550 if (emsgp) 1551 *emsgp = "illegal file descriptor name"; 1552 return (-1); 1553 } 1554 1555 if ((fl = fcntl((fd = ksh_numdig(name[0])), F_GETFL, 0)) < 0) { 1556 if (emsgp) 1557 *emsgp = "bad file descriptor"; 1558 return (-1); 1559 } 1560 fl &= O_ACCMODE; 1561 /* 1562 * X_OK is a kludge to disable this check for dups (x<&1): 1563 * historical shells never did this check (XXX don't know what 1564 * POSIX has to say). 1565 */ 1566 if (!(mode & X_OK) && fl != O_RDWR && ( 1567 ((mode & R_OK) && fl != O_RDONLY) || 1568 ((mode & W_OK) && fl != O_WRONLY))) { 1569 if (emsgp) 1570 *emsgp = (fl == O_WRONLY) ? 1571 "fd not open for reading" : 1572 "fd not open for writing"; 1573 return (-1); 1574 } 1575 return (fd); 1576 } 1577 1578 /* Called once from main */ 1579 void 1580 coproc_init(void) 1581 { 1582 coproc.read = coproc.readw = coproc.write = -1; 1583 coproc.njobs = 0; 1584 coproc.id = 0; 1585 } 1586 1587 /* Called by c_read() when eof is read - close fd if it is the co-process fd */ 1588 void 1589 coproc_read_close(int fd) 1590 { 1591 if (coproc.read >= 0 && fd == coproc.read) { 1592 coproc_readw_close(fd); 1593 close(coproc.read); 1594 coproc.read = -1; 1595 } 1596 } 1597 1598 /* 1599 * Called by c_read() and by iosetup() to close the other side of the 1600 * read pipe, so reads will actually terminate. 1601 */ 1602 void 1603 coproc_readw_close(int fd) 1604 { 1605 if (coproc.readw >= 0 && coproc.read >= 0 && fd == coproc.read) { 1606 close(coproc.readw); 1607 coproc.readw = -1; 1608 } 1609 } 1610 1611 /* 1612 * Called by c_print when a write to a fd fails with EPIPE and by iosetup 1613 * when co-process input is dup'd 1614 */ 1615 void 1616 coproc_write_close(int fd) 1617 { 1618 if (coproc.write >= 0 && fd == coproc.write) { 1619 close(coproc.write); 1620 coproc.write = -1; 1621 } 1622 } 1623 1624 /* 1625 * Called to check for existence of/value of the co-process file descriptor. 1626 * (Used by check_fd() and by c_read/c_print to deal with -p option). 1627 */ 1628 int 1629 coproc_getfd(int mode, const char **emsgp) 1630 { 1631 int fd = (mode & R_OK) ? coproc.read : coproc.write; 1632 1633 if (fd >= 0) 1634 return (fd); 1635 if (emsgp) 1636 *emsgp = "no coprocess"; 1637 return (-1); 1638 } 1639 1640 /* 1641 * called to close file descriptors related to the coprocess (if any) 1642 * Should be called with SIGCHLD blocked. 1643 */ 1644 void 1645 coproc_cleanup(int reuse) 1646 { 1647 /* This to allow co-processes to share output pipe */ 1648 if (!reuse || coproc.readw < 0 || coproc.read < 0) { 1649 if (coproc.read >= 0) { 1650 close(coproc.read); 1651 coproc.read = -1; 1652 } 1653 if (coproc.readw >= 0) { 1654 close(coproc.readw); 1655 coproc.readw = -1; 1656 } 1657 } 1658 if (coproc.write >= 0) { 1659 close(coproc.write); 1660 coproc.write = -1; 1661 } 1662 } 1663 1664 struct temp * 1665 maketemp(Area *ap, Temp_type type, struct temp **tlist) 1666 { 1667 char *cp; 1668 size_t len; 1669 int i, j; 1670 struct temp *tp; 1671 const char *dir; 1672 struct stat sb; 1673 1674 dir = tmpdir ? tmpdir : MKSH_DEFAULT_TMPDIR; 1675 /* add "/shXXXXXX.tmp" plus NUL */ 1676 len = strlen(dir); 1677 checkoktoadd(len, offsetof(struct temp, tffn[0]) + 14); 1678 tp = alloc(offsetof(struct temp, tffn[0]) + 14 + len, ap); 1679 1680 tp->shf = NULL; 1681 tp->pid = procpid; 1682 tp->type = type; 1683 1684 if (stat(dir, &sb) || !S_ISDIR(sb.st_mode)) { 1685 tp->tffn[0] = '\0'; 1686 goto maketemp_out; 1687 } 1688 1689 cp = (void *)tp; 1690 cp += offsetof(struct temp, tffn[0]); 1691 memcpy(cp, dir, len); 1692 cp += len; 1693 memcpy(cp, "/shXXXXXX.tmp", 14); 1694 /* point to the first of six Xes */ 1695 cp += 3; 1696 1697 /* cyclically attempt to open a temporary file */ 1698 do { 1699 /* generate random part of filename */ 1700 len = 0; 1701 do { 1702 cp[len++] = digits_lc[rndget() % 36]; 1703 } while (len < 6); 1704 1705 /* check if this one works */ 1706 if ((i = binopen3(tp->tffn, O_CREAT | O_EXCL | O_RDWR, 1707 0600)) < 0 && errno != EEXIST) 1708 goto maketemp_out; 1709 } while (i < 0); 1710 1711 if (type == TT_FUNSUB) { 1712 /* map us high and mark as close-on-exec */ 1713 if ((j = savefd(i)) != i) { 1714 close(i); 1715 i = j; 1716 } 1717 1718 /* operation mode for the shf */ 1719 j = SHF_RD; 1720 } else 1721 j = SHF_WR; 1722 1723 /* shf_fdopen cannot fail, so no fd leak */ 1724 tp->shf = shf_fdopen(i, j, NULL); 1725 1726 maketemp_out: 1727 tp->next = *tlist; 1728 *tlist = tp; 1729 return (tp); 1730 } 1731 1732 /* 1733 * We use a similar collision resolution algorithm as Python 2.5.4 1734 * but with a slightly tweaked implementation written from scratch. 1735 */ 1736 1737 #define INIT_TBLSHIFT 3 /* initial table shift (2^3 = 8) */ 1738 #define PERTURB_SHIFT 5 /* see Python 2.5.4 Objects/dictobject.c */ 1739 1740 static void tgrow(struct table *); 1741 static int tnamecmp(const void *, const void *); 1742 1743 static void 1744 tgrow(struct table *tp) 1745 { 1746 size_t i, j, osize, mask, perturb; 1747 struct tbl *tblp, **pp; 1748 struct tbl **ntblp, **otblp = tp->tbls; 1749 1750 if (tp->tshift > 29) 1751 internal_errorf("hash table size limit reached"); 1752 1753 /* calculate old size, new shift and new size */ 1754 osize = (size_t)1 << (tp->tshift++); 1755 i = osize << 1; 1756 1757 ntblp = alloc2(i, sizeof(struct tbl *), tp->areap); 1758 /* multiplication cannot overflow: alloc2 checked that */ 1759 memset(ntblp, 0, i * sizeof(struct tbl *)); 1760 1761 /* table can get very full when reaching its size limit */ 1762 tp->nfree = (tp->tshift == 30) ? 0x3FFF0000UL : 1763 /* but otherwise, only 75% */ 1764 ((i * 3) / 4); 1765 tp->tbls = ntblp; 1766 if (otblp == NULL) 1767 return; 1768 1769 mask = i - 1; 1770 for (i = 0; i < osize; i++) 1771 if ((tblp = otblp[i]) != NULL) { 1772 if ((tblp->flag & DEFINED)) { 1773 /* search for free hash table slot */ 1774 j = perturb = tblp->ua.hval; 1775 goto find_first_empty_slot; 1776 find_next_empty_slot: 1777 j = (j << 2) + j + perturb + 1; 1778 perturb >>= PERTURB_SHIFT; 1779 find_first_empty_slot: 1780 pp = &ntblp[j & mask]; 1781 if (*pp != NULL) 1782 goto find_next_empty_slot; 1783 /* found an empty hash table slot */ 1784 *pp = tblp; 1785 tp->nfree--; 1786 } else if (!(tblp->flag & FINUSE)) { 1787 afree(tblp, tp->areap); 1788 } 1789 } 1790 afree(otblp, tp->areap); 1791 } 1792 1793 void 1794 ktinit(Area *ap, struct table *tp, uint8_t initshift) 1795 { 1796 tp->areap = ap; 1797 tp->tbls = NULL; 1798 tp->tshift = ((initshift > INIT_TBLSHIFT) ? 1799 initshift : INIT_TBLSHIFT) - 1; 1800 tgrow(tp); 1801 } 1802 1803 /* table, name (key) to search for, hash(name), rv pointer to tbl ptr */ 1804 struct tbl * 1805 ktscan(struct table *tp, const char *name, uint32_t h, struct tbl ***ppp) 1806 { 1807 size_t j, perturb, mask; 1808 struct tbl **pp, *p; 1809 1810 mask = ((size_t)1 << (tp->tshift)) - 1; 1811 /* search for hash table slot matching name */ 1812 j = perturb = h; 1813 goto find_first_slot; 1814 find_next_slot: 1815 j = (j << 2) + j + perturb + 1; 1816 perturb >>= PERTURB_SHIFT; 1817 find_first_slot: 1818 pp = &tp->tbls[j & mask]; 1819 if ((p = *pp) != NULL && (p->ua.hval != h || !(p->flag & DEFINED) || 1820 strcmp(p->name, name))) 1821 goto find_next_slot; 1822 /* p == NULL if not found, correct found entry otherwise */ 1823 if (ppp) 1824 *ppp = pp; 1825 return (p); 1826 } 1827 1828 /* table, name (key) to enter, hash(n) */ 1829 struct tbl * 1830 ktenter(struct table *tp, const char *n, uint32_t h) 1831 { 1832 struct tbl **pp, *p; 1833 size_t len; 1834 1835 Search: 1836 if ((p = ktscan(tp, n, h, &pp))) 1837 return (p); 1838 1839 if (tp->nfree == 0) { 1840 /* too full */ 1841 tgrow(tp); 1842 goto Search; 1843 } 1844 1845 /* create new tbl entry */ 1846 len = strlen(n); 1847 checkoktoadd(len, offsetof(struct tbl, name[0]) + 1); 1848 p = alloc(offsetof(struct tbl, name[0]) + ++len, tp->areap); 1849 p->flag = 0; 1850 p->type = 0; 1851 p->areap = tp->areap; 1852 p->ua.hval = h; 1853 p->u2.field = 0; 1854 p->u.array = NULL; 1855 memcpy(p->name, n, len); 1856 1857 /* enter in tp->tbls */ 1858 tp->nfree--; 1859 *pp = p; 1860 return (p); 1861 } 1862 1863 void 1864 ktwalk(struct tstate *ts, struct table *tp) 1865 { 1866 ts->left = (size_t)1 << (tp->tshift); 1867 ts->next = tp->tbls; 1868 } 1869 1870 struct tbl * 1871 ktnext(struct tstate *ts) 1872 { 1873 while (--ts->left >= 0) { 1874 struct tbl *p = *ts->next++; 1875 if (p != NULL && (p->flag & DEFINED)) 1876 return (p); 1877 } 1878 return (NULL); 1879 } 1880 1881 static int 1882 tnamecmp(const void *p1, const void *p2) 1883 { 1884 const struct tbl *a = *((const struct tbl * const *)p1); 1885 const struct tbl *b = *((const struct tbl * const *)p2); 1886 1887 return (ascstrcmp(a->name, b->name)); 1888 } 1889 1890 struct tbl ** 1891 ktsort(struct table *tp) 1892 { 1893 size_t i; 1894 struct tbl **p, **sp, **dp; 1895 1896 /* 1897 * since the table is never entirely full, no need to reserve 1898 * additional space for the trailing NULL appended below 1899 */ 1900 i = (size_t)1 << (tp->tshift); 1901 p = alloc2(i, sizeof(struct tbl *), ATEMP); 1902 sp = tp->tbls; /* source */ 1903 dp = p; /* dest */ 1904 while (i--) 1905 if ((*dp = *sp++) != NULL && (((*dp)->flag & DEFINED) || 1906 ((*dp)->flag & ARRAY))) 1907 dp++; 1908 qsort(p, (i = dp - p), sizeof(struct tbl *), tnamecmp); 1909 p[i] = NULL; 1910 return (p); 1911 } 1912 1913 #ifdef SIGWINCH 1914 static void 1915 x_sigwinch(int sig MKSH_A_UNUSED) 1916 { 1917 /* this runs inside interrupt context, with errno saved */ 1918 1919 got_winch = 1; 1920 } 1921 #endif 1922 1923 #ifdef DF 1924 void 1925 DF(const char *fmt, ...) 1926 { 1927 va_list args; 1928 struct timeval tv; 1929 mirtime_mjd mjd; 1930 1931 mksh_lockfd(shl_dbg_fd); 1932 mksh_TIME(tv); 1933 timet2mjd(&mjd, tv.tv_sec); 1934 shf_fprintf(shl_dbg, "[%02u:%02u:%02u (%u) %u.%06u] ", 1935 (unsigned)mjd.sec / 3600, ((unsigned)mjd.sec / 60) % 60, 1936 (unsigned)mjd.sec % 60, (unsigned)getpid(), 1937 (unsigned)tv.tv_sec, (unsigned)tv.tv_usec); 1938 va_start(args, fmt); 1939 shf_vfprintf(shl_dbg, fmt, args); 1940 va_end(args); 1941 shf_putc('\n', shl_dbg); 1942 shf_flush(shl_dbg); 1943 mksh_unlkfd(shl_dbg_fd); 1944 } 1945 #endif 1946 1947 void 1948 x_mkraw(int fd, mksh_ttyst *ocb, bool forread) 1949 { 1950 mksh_ttyst cb; 1951 1952 if (ocb) 1953 mksh_tcget(fd, ocb); 1954 else 1955 ocb = &tty_state; 1956 1957 cb = *ocb; 1958 if (forread) { 1959 cb.c_iflag &= ~(ISTRIP); 1960 cb.c_lflag &= ~(ICANON) | ECHO; 1961 } else { 1962 cb.c_iflag &= ~(INLCR | ICRNL | ISTRIP); 1963 cb.c_lflag &= ~(ISIG | ICANON | ECHO); 1964 } 1965 #if defined(VLNEXT) && defined(_POSIX_VDISABLE) 1966 /* OSF/1 processes lnext when ~icanon */ 1967 cb.c_cc[VLNEXT] = _POSIX_VDISABLE; 1968 #endif 1969 /* SunOS 4.1.x and OSF/1 process discard(flush) when ~icanon */ 1970 #if defined(VDISCARD) && defined(_POSIX_VDISABLE) 1971 cb.c_cc[VDISCARD] = _POSIX_VDISABLE; 1972 #endif 1973 cb.c_cc[VTIME] = 0; 1974 cb.c_cc[VMIN] = 1; 1975 1976 mksh_tcset(fd, &cb); 1977 } 1978 1979 #ifdef MKSH_ENVDIR 1980 static void 1981 init_environ(void) 1982 { 1983 char *xp; 1984 ssize_t n; 1985 XString xs; 1986 struct shf *shf; 1987 DIR *dirp; 1988 struct dirent *dent; 1989 1990 if ((dirp = opendir(MKSH_ENVDIR)) == NULL) { 1991 warningf(false, "cannot read environment from %s: %s", 1992 MKSH_ENVDIR, cstrerror(errno)); 1993 return; 1994 } 1995 XinitN(xs, 256, ATEMP); 1996 read_envfile: 1997 errno = 0; 1998 if ((dent = readdir(dirp)) != NULL) { 1999 if (skip_varname(dent->d_name, true)[0] == '\0') { 2000 xp = shf_smprintf(Tf_sSs, MKSH_ENVDIR, dent->d_name); 2001 if (!(shf = shf_open(xp, O_RDONLY, 0, 0))) { 2002 warningf(false, 2003 "cannot read environment %s from %s: %s", 2004 dent->d_name, MKSH_ENVDIR, 2005 cstrerror(errno)); 2006 goto read_envfile; 2007 } 2008 afree(xp, ATEMP); 2009 n = strlen(dent->d_name); 2010 xp = Xstring(xs, xp); 2011 XcheckN(xs, xp, n + 32); 2012 memcpy(xp, dent->d_name, n); 2013 xp += n; 2014 *xp++ = '='; 2015 while ((n = shf_read(xp, Xnleft(xs, xp), shf)) > 0) { 2016 xp += n; 2017 if (Xnleft(xs, xp) <= 0) 2018 XcheckN(xs, xp, Xlength(xs, xp)); 2019 } 2020 if (n < 0) { 2021 warningf(false, 2022 "cannot read environment %s from %s: %s", 2023 dent->d_name, MKSH_ENVDIR, 2024 cstrerror(shf_errno(shf))); 2025 } else { 2026 *xp = '\0'; 2027 xp = Xstring(xs, xp); 2028 rndpush(xp); 2029 typeset(xp, IMPORT | EXPORT, 0, 0, 0); 2030 } 2031 shf_close(shf); 2032 } 2033 goto read_envfile; 2034 } else if (errno) 2035 warningf(false, "cannot read environment from %s: %s", 2036 MKSH_ENVDIR, cstrerror(errno)); 2037 closedir(dirp); 2038 Xfree(xs, xp); 2039 } 2040 #else 2041 extern char **environ; 2042 2043 static void 2044 init_environ(void) 2045 { 2046 const char **wp; 2047 2048 if (environ == NULL) 2049 return; 2050 2051 wp = (const char **)environ; 2052 while (*wp != NULL) { 2053 rndpush(*wp); 2054 typeset(*wp, IMPORT | EXPORT, 0, 0, 0); 2055 ++wp; 2056 } 2057 } 2058 #endif 2059 2060 #ifdef MKSH_EARLY_LOCALE_TRACKING 2061 void 2062 recheck_ctype(void) 2063 { 2064 const char *ccp; 2065 uint8_t old_utfmode = UTFMODE; 2066 2067 ccp = str_val(global("LC_ALL")); 2068 if (ccp == null) 2069 ccp = str_val(global("LC_CTYPE")); 2070 if (ccp == null) 2071 ccp = str_val(global("LANG")); 2072 UTFMODE = isuc(ccp); 2073 #if HAVE_SETLOCALE_CTYPE 2074 ccp = setlocale(LC_CTYPE, ccp); 2075 #if HAVE_LANGINFO_CODESET 2076 if (!isuc(ccp)) 2077 ccp = nl_langinfo(CODESET); 2078 #endif 2079 if (isuc(ccp)) 2080 UTFMODE = 1; 2081 #endif 2082 2083 if (Flag(FPOSIX) && UTFMODE && !old_utfmode) 2084 warningf(true, "early locale tracking enabled UTF-8 mode while in POSIX mode, you are now noncompliant"); 2085 } 2086 #endif 2087
