1 /* $OpenBSD: exec.c,v 1.52 2015/09/10 22:48:58 nicm Exp $ */ 2 3 /*- 4 * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 5 * 2011, 2012, 2013, 2014, 2015, 2016 6 * mirabilos <m (at) mirbsd.org> 7 * 8 * Provided that these terms and disclaimer and all copyright notices 9 * are retained or reproduced in an accompanying document, permission 10 * is granted to deal in this work without restriction, including un- 11 * limited rights to use, publicly perform, distribute, sell, modify, 12 * merge, give away, or sublicence. 13 * 14 * This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to 15 * the utmost extent permitted by applicable law, neither express nor 16 * implied; without malicious intent or gross negligence. In no event 17 * may a licensor, author or contributor be held liable for indirect, 18 * direct, other damage, loss, or other issues arising in any way out 19 * of dealing in the work, even if advised of the possibility of such 20 * damage or existence of a defect, except proven that it results out 21 * of said person's immediate fault when using the work as intended. 22 */ 23 24 #include "sh.h" 25 26 __RCSID("$MirOS: src/bin/mksh/exec.c,v 1.186 2016/11/11 23:31:34 tg Exp $"); 27 28 #ifndef MKSH_DEFAULT_EXECSHELL 29 #define MKSH_DEFAULT_EXECSHELL MKSH_UNIXROOT "/bin/sh" 30 #endif 31 32 static int comexec(struct op *, struct tbl * volatile, const char **, 33 int volatile, volatile int *); 34 static void scriptexec(struct op *, const char **) MKSH_A_NORETURN; 35 static int call_builtin(struct tbl *, const char **, const char *, bool); 36 static int iosetup(struct ioword *, struct tbl *); 37 static const char *do_selectargs(const char **, bool); 38 static Test_op dbteste_isa(Test_env *, Test_meta); 39 static const char *dbteste_getopnd(Test_env *, Test_op, bool); 40 static void dbteste_error(Test_env *, int, const char *); 41 /* XXX: horrible kludge to fit within the framework */ 42 static void plain_fmt_entry(char *, size_t, unsigned int, const void *); 43 static void select_fmt_entry(char *, size_t, unsigned int, const void *); 44 45 /* 46 * execute command tree 47 */ 48 int 49 execute(struct op * volatile t, 50 /* if XEXEC don't fork */ 51 volatile int flags, 52 volatile int * volatile xerrok) 53 { 54 int i; 55 volatile int rv = 0, dummy = 0; 56 int pv[2]; 57 const char ** volatile ap = NULL; 58 char ** volatile up; 59 const char *s, *ccp; 60 struct ioword **iowp; 61 struct tbl *tp = NULL; 62 63 if (t == NULL) 64 return (0); 65 66 /* Caller doesn't care if XERROK should propagate. */ 67 if (xerrok == NULL) 68 xerrok = &dummy; 69 70 if ((flags&XFORK) && !(flags&XEXEC) && t->type != TPIPE) 71 /* run in sub-process */ 72 return (exchild(t, flags & ~XTIME, xerrok, -1)); 73 74 newenv(E_EXEC); 75 if (trap) 76 runtraps(0); 77 78 /* we want to run an executable, do some variance checks */ 79 if (t->type == TCOM) { 80 /* 81 * Clear subst_exstat before argument expansion. Used by 82 * null commands (see comexec() and c_eval()) and by c_set(). 83 */ 84 subst_exstat = 0; 85 86 /* for $LINENO */ 87 current_lineno = t->lineno; 88 89 /* check if this is 'var=<<EOF' */ 90 if ( 91 /* we have zero arguments, i.e. no program to run */ 92 t->args[0] == NULL && 93 /* we have exactly one variable assignment */ 94 t->vars[0] != NULL && t->vars[1] == NULL && 95 /* we have exactly one I/O redirection */ 96 t->ioact != NULL && t->ioact[0] != NULL && 97 t->ioact[1] == NULL && 98 /* of type "here document" (or "here string") */ 99 (t->ioact[0]->ioflag & IOTYPE) == IOHERE && 100 /* the variable assignment begins with a valid varname */ 101 (ccp = skip_wdvarname(t->vars[0], true)) != t->vars[0] && 102 /* and has no right-hand side (i.e. "varname=") */ 103 ccp[0] == CHAR && ((ccp[1] == '=' && ccp[2] == EOS) || 104 /* or "varname+=" */ (ccp[1] == '+' && ccp[2] == CHAR && 105 ccp[3] == '=' && ccp[4] == EOS))) { 106 char *cp, *dp; 107 108 if ((rv = herein(t->ioact[0], &cp) /*? 1 : 0*/)) 109 cp = NULL; 110 dp = shf_smprintf(Tf_ss, evalstr(t->vars[0], 111 DOASNTILDE | DOSCALAR), rv ? null : cp); 112 typeset(dp, Flag(FEXPORT) ? EXPORT : 0, 0, 0, 0); 113 /* free the expanded value */ 114 afree(cp, APERM); 115 afree(dp, ATEMP); 116 goto Break; 117 } 118 119 /* 120 * POSIX says expand command words first, then redirections, 121 * and assignments last.. 122 */ 123 up = eval(t->args, t->u.evalflags | DOBLANK | DOGLOB | DOTILDE); 124 if (flags & XTIME) 125 /* Allow option parsing (bizarre, but POSIX) */ 126 timex_hook(t, &up); 127 ap = (const char **)up; 128 if (ap[0]) 129 tp = findcom(ap[0], FC_BI|FC_FUNC); 130 } 131 flags &= ~XTIME; 132 133 if (t->ioact != NULL || t->type == TPIPE || t->type == TCOPROC) { 134 e->savefd = alloc2(NUFILE, sizeof(short), ATEMP); 135 /* initialise to not redirected */ 136 memset(e->savefd, 0, NUFILE * sizeof(short)); 137 } 138 139 /* mark for replacement later (unless TPIPE) */ 140 vp_pipest->flag |= INT_L; 141 142 /* do redirection, to be restored in quitenv() */ 143 if (t->ioact != NULL) 144 for (iowp = t->ioact; *iowp != NULL; iowp++) { 145 if (iosetup(*iowp, tp) < 0) { 146 exstat = rv = 1; 147 /* 148 * Redirection failures for special commands 149 * cause (non-interactive) shell to exit. 150 */ 151 if (tp && tp->type == CSHELL && 152 (tp->flag & SPEC_BI)) 153 errorfz(); 154 /* Deal with FERREXIT, quitenv(), etc. */ 155 goto Break; 156 } 157 } 158 159 switch (t->type) { 160 case TCOM: 161 rv = comexec(t, tp, (const char **)ap, flags, xerrok); 162 break; 163 164 case TPAREN: 165 rv = execute(t->left, flags | XFORK, xerrok); 166 break; 167 168 case TPIPE: 169 flags |= XFORK; 170 flags &= ~XEXEC; 171 e->savefd[0] = savefd(0); 172 e->savefd[1] = savefd(1); 173 while (t->type == TPIPE) { 174 openpipe(pv); 175 /* stdout of curr */ 176 ksh_dup2(pv[1], 1, false); 177 /** 178 * Let exchild() close pv[0] in child 179 * (if this isn't done, commands like 180 * (: ; cat /etc/termcap) | sleep 1 181 * will hang forever). 182 */ 183 exchild(t->left, flags | XPIPEO | XCCLOSE, 184 NULL, pv[0]); 185 /* stdin of next */ 186 ksh_dup2(pv[0], 0, false); 187 closepipe(pv); 188 flags |= XPIPEI; 189 t = t->right; 190 } 191 /* stdout of last */ 192 restfd(1, e->savefd[1]); 193 /* no need to re-restore this */ 194 e->savefd[1] = 0; 195 /* Let exchild() close 0 in parent, after fork, before wait */ 196 i = exchild(t, flags | XPCLOSE | XPIPEST, xerrok, 0); 197 if (!(flags&XBGND) && !(flags&XXCOM)) 198 rv = i; 199 break; 200 201 case TLIST: 202 while (t->type == TLIST) { 203 execute(t->left, flags & XERROK, NULL); 204 t = t->right; 205 } 206 rv = execute(t, flags & XERROK, xerrok); 207 break; 208 209 case TCOPROC: { 210 #ifndef MKSH_NOPROSPECTOFWORK 211 sigset_t omask; 212 213 /* 214 * Block sigchild as we are using things changed in the 215 * signal handler 216 */ 217 sigprocmask(SIG_BLOCK, &sm_sigchld, &omask); 218 e->type = E_ERRH; 219 if ((i = kshsetjmp(e->jbuf))) { 220 sigprocmask(SIG_SETMASK, &omask, NULL); 221 quitenv(NULL); 222 unwind(i); 223 /* NOTREACHED */ 224 } 225 #endif 226 /* Already have a (live) co-process? */ 227 if (coproc.job && coproc.write >= 0) 228 errorf("coprocess already exists"); 229 230 /* Can we re-use the existing co-process pipe? */ 231 coproc_cleanup(true); 232 233 /* do this before opening pipes, in case these fail */ 234 e->savefd[0] = savefd(0); 235 e->savefd[1] = savefd(1); 236 237 openpipe(pv); 238 if (pv[0] != 0) { 239 ksh_dup2(pv[0], 0, false); 240 close(pv[0]); 241 } 242 coproc.write = pv[1]; 243 coproc.job = NULL; 244 245 if (coproc.readw >= 0) 246 ksh_dup2(coproc.readw, 1, false); 247 else { 248 openpipe(pv); 249 coproc.read = pv[0]; 250 ksh_dup2(pv[1], 1, false); 251 /* closed before first read */ 252 coproc.readw = pv[1]; 253 coproc.njobs = 0; 254 /* create new coprocess id */ 255 ++coproc.id; 256 } 257 #ifndef MKSH_NOPROSPECTOFWORK 258 sigprocmask(SIG_SETMASK, &omask, NULL); 259 /* no more need for error handler */ 260 e->type = E_EXEC; 261 #endif 262 263 /* 264 * exchild() closes coproc.* in child after fork, 265 * will also increment coproc.njobs when the 266 * job is actually created. 267 */ 268 flags &= ~XEXEC; 269 exchild(t->left, flags | XBGND | XFORK | XCOPROC | XCCLOSE, 270 NULL, coproc.readw); 271 break; 272 } 273 274 case TASYNC: 275 /* 276 * XXX non-optimal, I think - "(foo &)", forks for (), 277 * forks again for async... parent should optimise 278 * this to "foo &"... 279 */ 280 rv = execute(t->left, (flags&~XEXEC)|XBGND|XFORK, xerrok); 281 break; 282 283 case TOR: 284 case TAND: 285 rv = execute(t->left, XERROK, NULL); 286 if ((rv == 0) == (t->type == TAND)) 287 rv = execute(t->right, flags & XERROK, xerrok); 288 else { 289 flags |= XERROK; 290 if (xerrok) 291 *xerrok = 1; 292 } 293 break; 294 295 case TBANG: 296 rv = !execute(t->right, XERROK, xerrok); 297 flags |= XERROK; 298 if (xerrok) 299 *xerrok = 1; 300 break; 301 302 case TDBRACKET: { 303 Test_env te; 304 305 te.flags = TEF_DBRACKET; 306 te.pos.wp = t->args; 307 te.isa = dbteste_isa; 308 te.getopnd = dbteste_getopnd; 309 te.eval = test_eval; 310 te.error = dbteste_error; 311 312 rv = test_parse(&te); 313 break; 314 } 315 316 case TFOR: 317 case TSELECT: { 318 volatile bool is_first = true; 319 320 ap = (t->vars == NULL) ? e->loc->argv + 1 : 321 (const char **)eval((const char **)t->vars, 322 DOBLANK | DOGLOB | DOTILDE); 323 e->type = E_LOOP; 324 while ((i = kshsetjmp(e->jbuf))) { 325 if ((e->flags&EF_BRKCONT_PASS) || 326 (i != LBREAK && i != LCONTIN)) { 327 quitenv(NULL); 328 unwind(i); 329 } else if (i == LBREAK) { 330 rv = 0; 331 goto Break; 332 } 333 } 334 /* in case of a continue */ 335 rv = 0; 336 if (t->type == TFOR) { 337 while (*ap != NULL) { 338 setstr(global(t->str), *ap++, KSH_UNWIND_ERROR); 339 rv = execute(t->left, flags & XERROK, xerrok); 340 } 341 } else { 342 do_TSELECT: 343 if ((ccp = do_selectargs(ap, is_first))) { 344 is_first = false; 345 setstr(global(t->str), ccp, KSH_UNWIND_ERROR); 346 execute(t->left, flags & XERROK, xerrok); 347 goto do_TSELECT; 348 } 349 rv = 1; 350 } 351 break; 352 } 353 354 case TWHILE: 355 case TUNTIL: 356 e->type = E_LOOP; 357 while ((i = kshsetjmp(e->jbuf))) { 358 if ((e->flags&EF_BRKCONT_PASS) || 359 (i != LBREAK && i != LCONTIN)) { 360 quitenv(NULL); 361 unwind(i); 362 } else if (i == LBREAK) { 363 rv = 0; 364 goto Break; 365 } 366 } 367 /* in case of a continue */ 368 rv = 0; 369 while ((execute(t->left, XERROK, NULL) == 0) == 370 (t->type == TWHILE)) 371 rv = execute(t->right, flags & XERROK, xerrok); 372 break; 373 374 case TIF: 375 case TELIF: 376 if (t->right == NULL) 377 /* should be error */ 378 break; 379 rv = execute(t->left, XERROK, NULL) == 0 ? 380 execute(t->right->left, flags & XERROK, xerrok) : 381 execute(t->right->right, flags & XERROK, xerrok); 382 break; 383 384 case TCASE: 385 i = 0; 386 ccp = evalstr(t->str, DOTILDE | DOSCALAR); 387 for (t = t->left; t != NULL && t->type == TPAT; t = t->right) { 388 for (ap = (const char **)t->vars; *ap; ap++) { 389 if (i || ((s = evalstr(*ap, DOTILDE|DOPAT)) && 390 gmatchx(ccp, s, false))) { 391 record_match(ccp); 392 rv = execute(t->left, flags & XERROK, 393 xerrok); 394 i = 0; 395 switch (t->u.charflag) { 396 case '&': 397 i = 1; 398 /* FALLTHROUGH */ 399 case '|': 400 goto TCASE_next; 401 } 402 goto TCASE_out; 403 } 404 } 405 i = 0; 406 TCASE_next: 407 /* empty */; 408 } 409 TCASE_out: 410 break; 411 412 case TBRACE: 413 rv = execute(t->left, flags & XERROK, xerrok); 414 break; 415 416 case TFUNCT: 417 rv = define(t->str, t); 418 break; 419 420 case TTIME: 421 /* 422 * Clear XEXEC so nested execute() call doesn't exit 423 * (allows "ls -l | time grep foo"). 424 */ 425 rv = timex(t, flags & ~XEXEC, xerrok); 426 break; 427 428 case TEXEC: 429 /* an eval'd TCOM */ 430 up = makenv(); 431 restoresigs(); 432 cleanup_proc_env(); 433 { 434 union mksh_ccphack cargs; 435 436 cargs.ro = t->args; 437 execve(t->str, cargs.rw, up); 438 rv = errno; 439 } 440 if (rv == ENOEXEC) 441 scriptexec(t, (const char **)up); 442 else 443 errorf(Tf_sD_s, t->str, cstrerror(rv)); 444 } 445 Break: 446 exstat = rv & 0xFF; 447 if (vp_pipest->flag & INT_L) { 448 unset(vp_pipest, 1); 449 vp_pipest->flag = DEFINED | ISSET | INTEGER | RDONLY | 450 ARRAY | INT_U | INT_L; 451 vp_pipest->val.i = rv; 452 } 453 454 /* restores IO */ 455 quitenv(NULL); 456 if ((flags&XEXEC)) 457 /* exit child */ 458 unwind(LEXIT); 459 if (rv != 0 && !(flags & XERROK) && 460 (xerrok == NULL || !*xerrok)) { 461 if (Flag(FERREXIT) & 0x80) { 462 /* inside eval */ 463 Flag(FERREXIT) = 0; 464 } else { 465 trapsig(ksh_SIGERR); 466 if (Flag(FERREXIT)) 467 unwind(LERROR); 468 } 469 } 470 return (rv); 471 } 472 473 /* 474 * execute simple command 475 */ 476 477 static int 478 comexec(struct op *t, struct tbl * volatile tp, const char **ap, 479 volatile int flags, volatile int *xerrok) 480 { 481 int i; 482 volatile int rv = 0; 483 const char *cp; 484 const char **lastp; 485 /* Must be static (XXX but why?) */ 486 static struct op texec; 487 int type_flags; 488 bool resetspec; 489 int fcflags = FC_BI|FC_FUNC|FC_PATH; 490 struct block *l_expand, *l_assign; 491 int optc; 492 const char *exec_argv0 = NULL; 493 bool exec_clrenv = false; 494 495 /* snag the last argument for $_ */ 496 if (Flag(FTALKING) && *(lastp = ap)) { 497 /* 498 * XXX not the same as AT&T ksh, which only seems to set $_ 499 * after a newline (but not in functions/dot scripts, but in 500 * interactive and script) - perhaps save last arg here and 501 * set it in shell()?. 502 */ 503 while (*++lastp) 504 ; 505 /* setstr() can't fail here */ 506 setstr(typeset("_", LOCAL, 0, INTEGER, 0), *--lastp, 507 KSH_RETURN_ERROR); 508 } 509 510 /** 511 * Deal with the shell builtins builtin, exec and command since 512 * they can be followed by other commands. This must be done before 513 * we know if we should create a local block which must be done 514 * before we can do a path search (in case the assignments change 515 * PATH). 516 * Odd cases: 517 * FOO=bar exec >/dev/null FOO is kept but not exported 518 * FOO=bar exec foobar FOO is exported 519 * FOO=bar command exec >/dev/null FOO is neither kept nor exported 520 * FOO=bar command FOO is neither kept nor exported 521 * PATH=... foobar use new PATH in foobar search 522 */ 523 resetspec = false; 524 while (tp && tp->type == CSHELL) { 525 /* undo effects of command */ 526 fcflags = FC_BI|FC_FUNC|FC_PATH; 527 if (tp->val.f == c_builtin) { 528 if ((cp = *++ap) == NULL || 529 (!strcmp(cp, "--") && (cp = *++ap) == NULL)) { 530 tp = NULL; 531 break; 532 } 533 if ((tp = findcom(cp, FC_BI)) == NULL) 534 errorf(Tf_sD_sD_s, Tbuiltin, cp, Tnot_found); 535 if (tp->type == CSHELL && (tp->flag & LOW_BI)) 536 break; 537 continue; 538 } else if (tp->val.f == c_exec) { 539 if (ap[1] == NULL) 540 break; 541 ksh_getopt_reset(&builtin_opt, GF_ERROR); 542 while ((optc = ksh_getopt(ap, &builtin_opt, "a:c")) != -1) 543 switch (optc) { 544 case 'a': 545 exec_argv0 = builtin_opt.optarg; 546 break; 547 case 'c': 548 exec_clrenv = true; 549 /* ensure we can actually do this */ 550 resetspec = true; 551 break; 552 default: 553 rv = 2; 554 goto Leave; 555 } 556 ap += builtin_opt.optind; 557 flags |= XEXEC; 558 } else if (tp->val.f == c_command) { 559 bool saw_p = false; 560 561 /* 562 * Ugly dealing with options in two places (here 563 * and in c_command(), but such is life) 564 */ 565 ksh_getopt_reset(&builtin_opt, 0); 566 while ((optc = ksh_getopt(ap, &builtin_opt, ":p")) == 'p') 567 saw_p = true; 568 if (optc != -1) 569 /* command -vV or something */ 570 break; 571 /* don't look for functions */ 572 fcflags = FC_BI|FC_PATH; 573 if (saw_p) { 574 if (Flag(FRESTRICTED)) { 575 warningf(true, Tf_sD_s, 576 "command -p", "restricted"); 577 rv = 1; 578 goto Leave; 579 } 580 fcflags |= FC_DEFPATH; 581 } 582 ap += builtin_opt.optind; 583 /* 584 * POSIX says special builtins lose their status 585 * if accessed using command. 586 */ 587 resetspec = true; 588 if (!ap[0]) { 589 /* ensure command with no args exits with 0 */ 590 subst_exstat = 0; 591 break; 592 } 593 } else if (tp->flag & LOW_BI) { 594 /* if we have any flags, do not use the builtin */ 595 if ((ap[1] && ap[1][0] == '-' && ap[1][1] != '\0' && 596 /* argument, begins with -, is not - or -- */ 597 (ap[1][1] != '-' || ap[1][2] != '\0')) || 598 /* always prefer the external utility */ 599 (tp->flag & LOWER_BI)) { 600 struct tbl *ext_cmd; 601 602 ext_cmd = findcom(tp->name, FC_PATH | FC_FUNC); 603 if (ext_cmd && (ext_cmd->type != CTALIAS || 604 (ext_cmd->flag & ISSET))) 605 tp = ext_cmd; 606 } 607 break; 608 } else if (tp->val.f == c_trap) { 609 t->u.evalflags &= ~DOTCOMEXEC; 610 break; 611 } else 612 break; 613 tp = findcom(ap[0], fcflags & (FC_BI|FC_FUNC)); 614 } 615 if (t->u.evalflags & DOTCOMEXEC) 616 flags |= XEXEC; 617 l_expand = e->loc; 618 if (!resetspec && (!ap[0] || (tp && (tp->flag & KEEPASN)))) 619 type_flags = 0; 620 else { 621 /* create new variable/function block */ 622 newblock(); 623 /* ksh functions don't keep assignments, POSIX functions do. */ 624 if (!resetspec && tp && tp->type == CFUNC && 625 !(tp->flag & FKSH)) 626 type_flags = EXPORT; 627 else 628 type_flags = LOCAL|LOCAL_COPY|EXPORT; 629 } 630 l_assign = e->loc; 631 if (exec_clrenv) 632 l_assign->flags |= BF_STOPENV; 633 if (Flag(FEXPORT)) 634 type_flags |= EXPORT; 635 if (Flag(FXTRACE)) 636 change_xtrace(2, false); 637 for (i = 0; t->vars[i]; i++) { 638 /* do NOT lookup in the new var/fn block just created */ 639 e->loc = l_expand; 640 cp = evalstr(t->vars[i], DOASNTILDE | DOSCALAR); 641 e->loc = l_assign; 642 if (Flag(FXTRACE)) { 643 const char *ccp; 644 645 ccp = skip_varname(cp, true); 646 if (*ccp == '+') 647 ++ccp; 648 if (*ccp == '=') 649 ++ccp; 650 shf_write(cp, ccp - cp, shl_xtrace); 651 print_value_quoted(shl_xtrace, ccp); 652 shf_putc(' ', shl_xtrace); 653 } 654 /* but assign in there as usual */ 655 typeset(cp, type_flags, 0, 0, 0); 656 } 657 658 if (Flag(FXTRACE)) { 659 change_xtrace(2, false); 660 if (ap[rv = 0]) { 661 xtrace_ap_loop: 662 print_value_quoted(shl_xtrace, ap[rv]); 663 if (ap[++rv]) { 664 shf_putc(' ', shl_xtrace); 665 goto xtrace_ap_loop; 666 } 667 } 668 change_xtrace(1, false); 669 } 670 671 if ((cp = *ap) == NULL) { 672 rv = subst_exstat; 673 goto Leave; 674 } else if (!tp) { 675 if (Flag(FRESTRICTED) && mksh_vdirsep(cp)) { 676 warningf(true, Tf_sD_s, cp, "restricted"); 677 rv = 1; 678 goto Leave; 679 } 680 tp = findcom(cp, fcflags); 681 } 682 683 switch (tp->type) { 684 685 /* shell built-in */ 686 case CSHELL: 687 do_call_builtin: 688 rv = call_builtin(tp, (const char **)ap, null, resetspec); 689 if (resetspec && tp->val.f == c_shift) { 690 l_expand->argc = l_assign->argc; 691 l_expand->argv = l_assign->argv; 692 } 693 break; 694 695 /* function call */ 696 case CFUNC: { 697 volatile uint32_t old_inuse; 698 const char * volatile old_kshname; 699 volatile uint8_t old_flags[FNFLAGS]; 700 701 if (!(tp->flag & ISSET)) { 702 struct tbl *ftp; 703 704 if (!tp->u.fpath) { 705 fpath_error: 706 rv = (tp->u2.errnov == ENOENT) ? 127 : 126; 707 warningf(true, Tf_sD_s_sD_s, cp, 708 Tcant_find, Tfile_fd, 709 cstrerror(tp->u2.errnov)); 710 break; 711 } 712 errno = 0; 713 if (include(tp->u.fpath, 0, NULL, false) < 0 || 714 !(ftp = findfunc(cp, hash(cp), false)) || 715 !(ftp->flag & ISSET)) { 716 rv = errno; 717 if ((ftp = findcom(cp, FC_BI)) && 718 (ftp->type == CSHELL) && 719 (ftp->flag & LOW_BI)) { 720 tp = ftp; 721 goto do_call_builtin; 722 } 723 if (rv) { 724 tp->u2.errnov = rv; 725 cp = tp->u.fpath; 726 goto fpath_error; 727 } 728 warningf(true, Tf_sD_s_s, cp, 729 "function not defined by", tp->u.fpath); 730 rv = 127; 731 break; 732 } 733 tp = ftp; 734 } 735 736 /* 737 * ksh functions set $0 to function name, POSIX 738 * functions leave $0 unchanged. 739 */ 740 old_kshname = kshname; 741 if (tp->flag & FKSH) 742 kshname = ap[0]; 743 else 744 ap[0] = kshname; 745 e->loc->argv = ap; 746 for (i = 0; *ap++ != NULL; i++) 747 ; 748 e->loc->argc = i - 1; 749 /* 750 * ksh-style functions handle getopts sanely, 751 * Bourne/POSIX functions are insane... 752 */ 753 if (tp->flag & FKSH) { 754 e->loc->flags |= BF_DOGETOPTS; 755 e->loc->getopts_state = user_opt; 756 getopts_reset(1); 757 } 758 759 for (type_flags = 0; type_flags < FNFLAGS; ++type_flags) 760 old_flags[type_flags] = shell_flags[type_flags]; 761 change_xtrace((Flag(FXTRACEREC) ? Flag(FXTRACE) : 0) | 762 ((tp->flag & TRACE) ? 1 : 0), false); 763 old_inuse = tp->flag & FINUSE; 764 tp->flag |= FINUSE; 765 766 e->type = E_FUNC; 767 if (!(i = kshsetjmp(e->jbuf))) { 768 execute(tp->val.t, flags & XERROK, NULL); 769 i = LRETURN; 770 } 771 772 kshname = old_kshname; 773 change_xtrace(old_flags[(int)FXTRACE], false); 774 #ifndef MKSH_LEGACY_MODE 775 if (tp->flag & FKSH) { 776 /* Korn style functions restore Flags on return */ 777 old_flags[(int)FXTRACE] = Flag(FXTRACE); 778 for (type_flags = 0; type_flags < FNFLAGS; ++type_flags) 779 shell_flags[type_flags] = old_flags[type_flags]; 780 } 781 #endif 782 tp->flag = (tp->flag & ~FINUSE) | old_inuse; 783 784 /* 785 * Were we deleted while executing? If so, free the 786 * execution tree. 787 */ 788 if ((tp->flag & (FDELETE|FINUSE)) == FDELETE) { 789 if (tp->flag & ALLOC) { 790 tp->flag &= ~ALLOC; 791 tfree(tp->val.t, tp->areap); 792 } 793 tp->flag = 0; 794 } 795 switch (i) { 796 case LRETURN: 797 case LERROR: 798 rv = exstat & 0xFF; 799 break; 800 case LINTR: 801 case LEXIT: 802 case LLEAVE: 803 case LSHELL: 804 quitenv(NULL); 805 unwind(i); 806 /* NOTREACHED */ 807 default: 808 quitenv(NULL); 809 internal_errorf(Tf_sd, "CFUNC", i); 810 } 811 break; 812 } 813 814 /* executable command */ 815 case CEXEC: 816 /* tracked alias */ 817 case CTALIAS: 818 if (!(tp->flag&ISSET)) { 819 if (tp->u2.errnov == ENOENT) { 820 rv = 127; 821 warningf(true, Tf_sD_s, cp, Tnot_found); 822 } else { 823 rv = 126; 824 warningf(true, Tf_sD_sD_s, cp, "can't execute", 825 cstrerror(tp->u2.errnov)); 826 } 827 break; 828 } 829 830 /* set $_ to program's full path */ 831 /* setstr() can't fail here */ 832 setstr(typeset("_", LOCAL | EXPORT, 0, INTEGER, 0), 833 tp->val.s, KSH_RETURN_ERROR); 834 835 /* to fork, we set up a TEXEC node and call execute */ 836 texec.type = TEXEC; 837 /* for vistree/dumptree */ 838 texec.left = t; 839 texec.str = tp->val.s; 840 texec.args = ap; 841 842 /* in this case we do not fork, of course */ 843 if (flags & XEXEC) { 844 if (exec_argv0) 845 texec.args[0] = exec_argv0; 846 j_exit(); 847 if (!(flags & XBGND) 848 #ifndef MKSH_UNEMPLOYED 849 || Flag(FMONITOR) 850 #endif 851 ) { 852 setexecsig(&sigtraps[SIGINT], SS_RESTORE_ORIG); 853 setexecsig(&sigtraps[SIGQUIT], SS_RESTORE_ORIG); 854 } 855 } 856 857 rv = exchild(&texec, flags, xerrok, -1); 858 break; 859 } 860 Leave: 861 if (flags & XEXEC) { 862 exstat = rv & 0xFF; 863 unwind(LLEAVE); 864 } 865 return (rv); 866 } 867 868 static void 869 scriptexec(struct op *tp, const char **ap) 870 { 871 const char *sh; 872 #ifndef MKSH_SMALL 873 int fd; 874 unsigned char buf[68]; 875 #endif 876 union mksh_ccphack args, cap; 877 878 sh = str_val(global(TEXECSHELL)); 879 if (sh && *sh) 880 sh = search_path(sh, path, X_OK, NULL); 881 if (!sh || !*sh) 882 sh = MKSH_DEFAULT_EXECSHELL; 883 884 *tp->args-- = tp->str; 885 886 #ifndef MKSH_SMALL 887 if ((fd = binopen2(tp->str, O_RDONLY)) >= 0) { 888 unsigned char *cp; 889 unsigned short m; 890 ssize_t n; 891 892 /* read first couple of octets from file */ 893 n = read(fd, buf, sizeof(buf) - 1); 894 close(fd); 895 /* read error or short read? */ 896 if (n < 5) 897 goto nomagic; 898 /* terminate buffer */ 899 buf[n] = '\0'; 900 901 /* skip UTF-8 Byte Order Mark, if present */ 902 cp = buf + (n = ((buf[0] == 0xEF) && (buf[1] == 0xBB) && 903 (buf[2] == 0xBF)) ? 3 : 0); 904 905 /* scan for newline or NUL (end of buffer) */ 906 while (*cp && *cp != '\n') 907 ++cp; 908 /* if the shebang line is longer than MAXINTERP, bail out */ 909 if (!*cp) 910 goto noshebang; 911 /* replace newline by NUL */ 912 *cp = '\0'; 913 914 /* restore start of shebang position (buf+0 or buf+3) */ 915 cp = buf + n; 916 /* bail out if no shebang magic found */ 917 if (cp[0] == '#' && cp[1] == '!') 918 cp += 2; 919 #ifdef __OS2__ 920 else if (!strncmp(cp, Textproc, 7) && 921 (cp[7] == ' ' || cp[7] == '\t')) 922 cp += 8; 923 #endif 924 else 925 goto noshebang; 926 /* skip whitespace before shell name */ 927 while (*cp == ' ' || *cp == '\t') 928 ++cp; 929 /* just whitespace on the line? */ 930 if (*cp == '\0') 931 goto noshebang; 932 /* no, we actually found an interpreter name */ 933 sh = (char *)cp; 934 /* look for end of shell/interpreter name */ 935 while (*cp != ' ' && *cp != '\t' && *cp != '\0') 936 ++cp; 937 /* any arguments? */ 938 if (*cp) { 939 *cp++ = '\0'; 940 /* skip spaces before arguments */ 941 while (*cp == ' ' || *cp == '\t') 942 ++cp; 943 /* pass it all in ONE argument (historic reasons) */ 944 if (*cp) 945 *tp->args-- = (char *)cp; 946 } 947 goto nomagic; 948 noshebang: 949 m = buf[0] << 8 | buf[1]; 950 if (m == 0x7F45 && buf[2] == 'L' && buf[3] == 'F') 951 errorf("%s: not executable: %d-bit ELF file", tp->str, 952 32 * buf[4]); 953 if ((m == /* OMAGIC */ 0407) || 954 (m == /* NMAGIC */ 0410) || 955 (m == /* ZMAGIC */ 0413) || 956 (m == /* QMAGIC */ 0314) || 957 (m == /* ECOFF_I386 */ 0x4C01) || 958 (m == /* ECOFF_M68K */ 0x0150 || m == 0x5001) || 959 (m == /* ECOFF_SH */ 0x0500 || m == 0x0005) || 960 (m == /* bzip */ 0x425A) || (m == /* "MZ" */ 0x4D5A) || 961 (m == /* "NE" */ 0x4E45) || (m == /* "LX" */ 0x4C58) || 962 (m == /* ksh93 */ 0x0B13) || (m == /* LZIP */ 0x4C5A) || 963 (m == /* xz */ 0xFD37 && buf[2] == 'z' && buf[3] == 'X' && 964 buf[4] == 'Z') || (m == /* 7zip */ 0x377A) || 965 (m == /* gzip */ 0x1F8B) || (m == /* .Z */ 0x1F9D)) 966 errorf("%s: not executable: magic %04X", tp->str, m); 967 nomagic: 968 ; 969 } 970 #endif 971 args.ro = tp->args; 972 *args.ro = sh; 973 974 cap.ro = ap; 975 execve(args.rw[0], args.rw, cap.rw); 976 977 /* report both the programme that was run and the bogus interpreter */ 978 errorf(Tf_sD_sD_s, tp->str, sh, cstrerror(errno)); 979 } 980 981 int 982 shcomexec(const char **wp) 983 { 984 struct tbl *tp; 985 986 tp = ktsearch(&builtins, *wp, hash(*wp)); 987 return (call_builtin(tp, wp, "shcomexec", false)); 988 } 989 990 /* 991 * Search function tables for a function. If create set, a table entry 992 * is created if none is found. 993 */ 994 struct tbl * 995 findfunc(const char *name, uint32_t h, bool create) 996 { 997 struct block *l; 998 struct tbl *tp = NULL; 999 1000 for (l = e->loc; l; l = l->next) { 1001 tp = ktsearch(&l->funs, name, h); 1002 if (tp) 1003 break; 1004 if (!l->next && create) { 1005 tp = ktenter(&l->funs, name, h); 1006 tp->flag = DEFINED; 1007 tp->type = CFUNC; 1008 tp->val.t = NULL; 1009 break; 1010 } 1011 } 1012 return (tp); 1013 } 1014 1015 /* 1016 * define function. Returns 1 if function is being undefined (t == 0) and 1017 * function did not exist, returns 0 otherwise. 1018 */ 1019 int 1020 define(const char *name, struct op *t) 1021 { 1022 uint32_t nhash; 1023 struct tbl *tp; 1024 bool was_set = false; 1025 1026 nhash = hash(name); 1027 1028 while (/* CONSTCOND */ 1) { 1029 tp = findfunc(name, nhash, true); 1030 1031 if (tp->flag & ISSET) 1032 was_set = true; 1033 /* 1034 * If this function is currently being executed, we zap 1035 * this table entry so findfunc() won't see it 1036 */ 1037 if (tp->flag & FINUSE) { 1038 tp->name[0] = '\0'; 1039 /* ensure it won't be found */ 1040 tp->flag &= ~DEFINED; 1041 tp->flag |= FDELETE; 1042 } else 1043 break; 1044 } 1045 1046 if (tp->flag & ALLOC) { 1047 tp->flag &= ~(ISSET|ALLOC|FKSH); 1048 tfree(tp->val.t, tp->areap); 1049 } 1050 1051 if (t == NULL) { 1052 /* undefine */ 1053 ktdelete(tp); 1054 return (was_set ? 0 : 1); 1055 } 1056 1057 tp->val.t = tcopy(t->left, tp->areap); 1058 tp->flag |= (ISSET|ALLOC); 1059 if (t->u.ksh_func) 1060 tp->flag |= FKSH; 1061 1062 return (0); 1063 } 1064 1065 /* 1066 * add builtin 1067 */ 1068 const char * 1069 builtin(const char *name, int (*func) (const char **)) 1070 { 1071 struct tbl *tp; 1072 uint32_t flag = DEFINED; 1073 1074 /* see if any flags should be set for this builtin */ 1075 flags_loop: 1076 switch (*name) { 1077 case '=': 1078 /* command does variable assignment */ 1079 flag |= KEEPASN; 1080 break; 1081 case '*': 1082 /* POSIX special builtin */ 1083 flag |= SPEC_BI; 1084 break; 1085 case '~': 1086 /* external utility overrides built-in utility, always */ 1087 flag |= LOWER_BI; 1088 /* FALLTHROUGH */ 1089 case '!': 1090 /* external utility overrides built-in utility, with flags */ 1091 flag |= LOW_BI; 1092 break; 1093 default: 1094 goto flags_seen; 1095 } 1096 ++name; 1097 goto flags_loop; 1098 flags_seen: 1099 1100 /* enter into the builtins hash table */ 1101 tp = ktenter(&builtins, name, hash(name)); 1102 tp->flag = flag; 1103 tp->type = CSHELL; 1104 tp->val.f = func; 1105 1106 /* return name, for direct builtin call check in main.c */ 1107 return (name); 1108 } 1109 1110 /* 1111 * find command 1112 * either function, hashed command, or built-in (in that order) 1113 */ 1114 struct tbl * 1115 findcom(const char *name, int flags) 1116 { 1117 static struct tbl temp; 1118 uint32_t h = hash(name); 1119 struct tbl *tp = NULL, *tbi; 1120 /* insert if not found */ 1121 unsigned char insert = Flag(FTRACKALL); 1122 /* for function autoloading */ 1123 char *fpath; 1124 union mksh_cchack npath; 1125 1126 if (mksh_vdirsep(name)) { 1127 insert = 0; 1128 /* prevent FPATH search below */ 1129 flags &= ~FC_FUNC; 1130 goto Search; 1131 } 1132 tbi = (flags & FC_BI) ? ktsearch(&builtins, name, h) : NULL; 1133 /* 1134 * POSIX says special builtins first, then functions, then 1135 * regular builtins, then search path... 1136 */ 1137 if ((flags & FC_SPECBI) && tbi && (tbi->flag & SPEC_BI)) 1138 tp = tbi; 1139 if (!tp && (flags & FC_FUNC)) { 1140 tp = findfunc(name, h, false); 1141 if (tp && !(tp->flag & ISSET)) { 1142 if ((fpath = str_val(global(TFPATH))) == null) { 1143 tp->u.fpath = NULL; 1144 tp->u2.errnov = ENOENT; 1145 } else 1146 tp->u.fpath = search_path(name, fpath, R_OK, 1147 &tp->u2.errnov); 1148 } 1149 } 1150 if (!tp && (flags & FC_NORMBI) && tbi) 1151 tp = tbi; 1152 if (!tp && (flags & FC_PATH) && !(flags & FC_DEFPATH)) { 1153 tp = ktsearch(&taliases, name, h); 1154 if (tp && (tp->flag & ISSET) && 1155 ksh_access(tp->val.s, X_OK) != 0) { 1156 if (tp->flag & ALLOC) { 1157 tp->flag &= ~ALLOC; 1158 afree(tp->val.s, APERM); 1159 } 1160 tp->flag &= ~ISSET; 1161 } 1162 } 1163 1164 Search: 1165 if ((!tp || (tp->type == CTALIAS && !(tp->flag&ISSET))) && 1166 (flags & FC_PATH)) { 1167 if (!tp) { 1168 if (insert && !(flags & FC_DEFPATH)) { 1169 tp = ktenter(&taliases, name, h); 1170 tp->type = CTALIAS; 1171 } else { 1172 tp = &temp; 1173 tp->type = CEXEC; 1174 } 1175 /* make ~ISSET */ 1176 tp->flag = DEFINED; 1177 } 1178 npath.ro = search_path(name, 1179 (flags & FC_DEFPATH) ? def_path : path, 1180 X_OK, &tp->u2.errnov); 1181 if (npath.ro) { 1182 strdupx(tp->val.s, npath.ro, APERM); 1183 if (npath.ro != name) 1184 afree(npath.rw, ATEMP); 1185 tp->flag |= ISSET|ALLOC; 1186 } else if ((flags & FC_FUNC) && 1187 (fpath = str_val(global(TFPATH))) != null && 1188 (npath.ro = search_path(name, fpath, R_OK, 1189 &tp->u2.errnov)) != NULL) { 1190 /* 1191 * An undocumented feature of AT&T ksh is that 1192 * it searches FPATH if a command is not found, 1193 * even if the command hasn't been set up as an 1194 * autoloaded function (ie, no typeset -uf). 1195 */ 1196 tp = &temp; 1197 tp->type = CFUNC; 1198 /* make ~ISSET */ 1199 tp->flag = DEFINED; 1200 tp->u.fpath = npath.ro; 1201 } 1202 } 1203 return (tp); 1204 } 1205 1206 /* 1207 * flush executable commands with relative paths 1208 * (just relative or all?) 1209 */ 1210 void 1211 flushcom(bool all) 1212 { 1213 struct tbl *tp; 1214 struct tstate ts; 1215 1216 for (ktwalk(&ts, &taliases); (tp = ktnext(&ts)) != NULL; ) 1217 if ((tp->flag&ISSET) && (all || !mksh_abspath(tp->val.s))) { 1218 if (tp->flag&ALLOC) { 1219 tp->flag &= ~(ALLOC|ISSET); 1220 afree(tp->val.s, APERM); 1221 } 1222 tp->flag &= ~ISSET; 1223 } 1224 } 1225 1226 /* check if path is something we want to find */ 1227 int 1228 search_access(const char *fn, int mode) 1229 { 1230 struct stat sb; 1231 1232 if (stat(fn, &sb) < 0) 1233 /* file does not exist */ 1234 return (ENOENT); 1235 /* LINTED use of access */ 1236 if (access(fn, mode) < 0) { 1237 /* file exists, but we can't access it */ 1238 int eno; 1239 1240 eno = errno; 1241 return (eno ? eno : EACCES); 1242 } 1243 #ifdef __OS2__ 1244 /* treat all files as executable on OS/2 */ 1245 sb.st_mode &= S_IXUSR | S_IXGRP | S_IXOTH; 1246 #endif 1247 if (mode == X_OK && (!S_ISREG(sb.st_mode) || 1248 !(sb.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)))) 1249 /* access(2) may say root can execute everything */ 1250 return (S_ISDIR(sb.st_mode) ? EISDIR : EACCES); 1251 return (0); 1252 } 1253 1254 /* 1255 * search for command with PATH 1256 */ 1257 const char * 1258 search_path(const char *name, const char *lpath, 1259 /* R_OK or X_OK */ 1260 int mode, 1261 /* set if candidate found, but not suitable */ 1262 int *errnop) 1263 { 1264 const char *sp, *p; 1265 char *xp; 1266 XString xs; 1267 size_t namelen; 1268 int ec = 0, ev; 1269 1270 if (mksh_vdirsep(name)) { 1271 if ((ec = search_access(name, mode)) == 0) { 1272 search_path_ok: 1273 if (errnop) 1274 *errnop = 0; 1275 return (name); 1276 } 1277 goto search_path_err; 1278 } 1279 1280 namelen = strlen(name) + 1; 1281 Xinit(xs, xp, 128, ATEMP); 1282 1283 sp = lpath; 1284 while (sp != NULL) { 1285 xp = Xstring(xs, xp); 1286 if (!(p = cstrchr(sp, MKSH_PATHSEPC))) 1287 p = sp + strlen(sp); 1288 if (p != sp) { 1289 XcheckN(xs, xp, p - sp); 1290 memcpy(xp, sp, p - sp); 1291 xp += p - sp; 1292 *xp++ = '/'; 1293 } 1294 sp = p; 1295 XcheckN(xs, xp, namelen); 1296 memcpy(xp, name, namelen); 1297 if ((ev = search_access(Xstring(xs, xp), mode)) == 0) { 1298 name = Xclose(xs, xp + namelen); 1299 goto search_path_ok; 1300 } 1301 /* accumulate non-ENOENT errors only */ 1302 if (ev != ENOENT && ec == 0) 1303 ec = ev; 1304 if (*sp++ == '\0') 1305 sp = NULL; 1306 } 1307 Xfree(xs, xp); 1308 search_path_err: 1309 if (errnop) 1310 *errnop = ec ? ec : ENOENT; 1311 return (NULL); 1312 } 1313 1314 static int 1315 call_builtin(struct tbl *tp, const char **wp, const char *where, bool resetspec) 1316 { 1317 int rv; 1318 1319 if (!tp) 1320 internal_errorf(Tf_sD_s, where, wp[0]); 1321 builtin_argv0 = wp[0]; 1322 builtin_spec = tobool(!resetspec && 1323 /*XXX odd use of KEEPASN */ 1324 ((tp->flag & SPEC_BI) || (Flag(FPOSIX) && (tp->flag & KEEPASN)))); 1325 shf_reopen(1, SHF_WR, shl_stdout); 1326 shl_stdout_ok = true; 1327 ksh_getopt_reset(&builtin_opt, GF_ERROR); 1328 rv = (*tp->val.f)(wp); 1329 shf_flush(shl_stdout); 1330 shl_stdout_ok = false; 1331 builtin_argv0 = NULL; 1332 builtin_spec = false; 1333 return (rv); 1334 } 1335 1336 /* 1337 * set up redirection, saving old fds in e->savefd 1338 */ 1339 static int 1340 iosetup(struct ioword *iop, struct tbl *tp) 1341 { 1342 int u = -1; 1343 char *cp = iop->ioname; 1344 int iotype = iop->ioflag & IOTYPE; 1345 bool do_open = true, do_close = false, do_fstat = false; 1346 int flags = 0; 1347 struct ioword iotmp; 1348 struct stat statb; 1349 1350 if (iotype != IOHERE) 1351 cp = evalonestr(cp, DOTILDE|(Flag(FTALKING_I) ? DOGLOB : 0)); 1352 1353 /* Used for tracing and error messages to print expanded cp */ 1354 iotmp = *iop; 1355 iotmp.ioname = (iotype == IOHERE) ? NULL : cp; 1356 iotmp.ioflag |= IONAMEXP; 1357 1358 if (Flag(FXTRACE)) { 1359 change_xtrace(2, false); 1360 fptreef(shl_xtrace, 0, Tft_R, &iotmp); 1361 change_xtrace(1, false); 1362 } 1363 1364 switch (iotype) { 1365 case IOREAD: 1366 flags = O_RDONLY; 1367 break; 1368 1369 case IOCAT: 1370 flags = O_WRONLY | O_APPEND | O_CREAT; 1371 break; 1372 1373 case IOWRITE: 1374 if (Flag(FNOCLOBBER) && !(iop->ioflag & IOCLOB)) { 1375 /* >file under set -C */ 1376 if (stat(cp, &statb)) { 1377 /* nonexistent file */ 1378 flags = O_WRONLY | O_CREAT | O_EXCL; 1379 } else if (S_ISREG(statb.st_mode)) { 1380 /* regular file, refuse clobbering */ 1381 goto clobber_refused; 1382 } else { 1383 /* 1384 * allow redirections to things 1385 * like /dev/null without error 1386 */ 1387 flags = O_WRONLY; 1388 /* but check again after opening */ 1389 do_fstat = true; 1390 } 1391 } else { 1392 /* >|file or set +C */ 1393 flags = O_WRONLY | O_CREAT | O_TRUNC; 1394 } 1395 break; 1396 1397 case IORDWR: 1398 flags = O_RDWR | O_CREAT; 1399 break; 1400 1401 case IOHERE: 1402 do_open = false; 1403 /* herein() returns -2 if error has been printed */ 1404 u = herein(iop, NULL); 1405 /* cp may have wrong name */ 1406 break; 1407 1408 case IODUP: { 1409 const char *emsg; 1410 1411 do_open = false; 1412 if (ksh_isdash(cp)) { 1413 /* prevent error return below */ 1414 u = 1009; 1415 do_close = true; 1416 } else if ((u = check_fd(cp, 1417 X_OK | ((iop->ioflag & IORDUP) ? R_OK : W_OK), 1418 &emsg)) < 0) { 1419 char *sp; 1420 1421 warningf(true, Tf_sD_s, 1422 (sp = snptreef(NULL, 32, Tft_R, &iotmp)), emsg); 1423 afree(sp, ATEMP); 1424 return (-1); 1425 } 1426 if (u == (int)iop->unit) 1427 /* "dup from" == "dup to" */ 1428 return (0); 1429 break; 1430 } 1431 } 1432 1433 if (do_open) { 1434 if (Flag(FRESTRICTED) && (flags & O_CREAT)) { 1435 warningf(true, Tf_sD_s, cp, "restricted"); 1436 return (-1); 1437 } 1438 u = binopen3(cp, flags, 0666); 1439 if (do_fstat && u >= 0) { 1440 /* prevent race conditions */ 1441 if (fstat(u, &statb) || S_ISREG(statb.st_mode)) { 1442 close(u); 1443 clobber_refused: 1444 u = -1; 1445 errno = EEXIST; 1446 } 1447 } 1448 } 1449 if (u < 0) { 1450 /* herein() may already have printed message */ 1451 if (u == -1) { 1452 u = errno; 1453 warningf(true, Tf_cant, 1454 iotype == IODUP ? "dup" : 1455 (iotype == IOREAD || iotype == IOHERE) ? 1456 Topen : Tcreate, cp, cstrerror(u)); 1457 } 1458 return (-1); 1459 } 1460 /* Do not save if it has already been redirected (i.e. "cat >x >y"). */ 1461 if (e->savefd[iop->unit] == 0) { 1462 /* If these are the same, it means unit was previously closed */ 1463 if (u == (int)iop->unit) 1464 e->savefd[iop->unit] = -1; 1465 else 1466 /* 1467 * c_exec() assumes e->savefd[fd] set for any 1468 * redirections. Ask savefd() not to close iop->unit; 1469 * this allows error messages to be seen if iop->unit 1470 * is 2; also means we can't lose the fd (eg, both 1471 * dup2 below and dup2 in restfd() failing). 1472 */ 1473 e->savefd[iop->unit] = savefd(iop->unit); 1474 } 1475 1476 if (do_close) 1477 close(iop->unit); 1478 else if (u != (int)iop->unit) { 1479 if (ksh_dup2(u, iop->unit, true) < 0) { 1480 int eno; 1481 char *sp; 1482 1483 eno = errno; 1484 warningf(true, Tf_s_sD_s, Tredirection_dup, 1485 (sp = snptreef(NULL, 32, Tft_R, &iotmp)), 1486 cstrerror(eno)); 1487 afree(sp, ATEMP); 1488 if (iotype != IODUP) 1489 close(u); 1490 return (-1); 1491 } 1492 if (iotype != IODUP) 1493 close(u); 1494 /* 1495 * Touching any co-process fd in an empty exec 1496 * causes the shell to close its copies 1497 */ 1498 else if (tp && tp->type == CSHELL && tp->val.f == c_exec) { 1499 if (iop->ioflag & IORDUP) 1500 /* possible exec <&p */ 1501 coproc_read_close(u); 1502 else 1503 /* possible exec >&p */ 1504 coproc_write_close(u); 1505 } 1506 } 1507 if (u == 2) 1508 /* Clear any write errors */ 1509 shf_reopen(2, SHF_WR, shl_out); 1510 return (0); 1511 } 1512 1513 /* 1514 * Process here documents by providing the content, either as 1515 * result (globally allocated) string or in a temp file; if 1516 * unquoted, the string is expanded first. 1517 */ 1518 static int 1519 hereinval(struct ioword *iop, int sub, char **resbuf, struct shf *shf) 1520 { 1521 const char * volatile ccp = iop->heredoc; 1522 struct source *s, *osource; 1523 1524 osource = source; 1525 newenv(E_ERRH); 1526 if (kshsetjmp(e->jbuf)) { 1527 source = osource; 1528 quitenv(shf); 1529 /* special to iosetup(): don't print error */ 1530 return (-2); 1531 } 1532 if (iop->ioflag & IOHERESTR) { 1533 ccp = evalstr(iop->delim, DOHERESTR | DOSCALAR | DOHEREDOC); 1534 } else if (sub) { 1535 /* do substitutions on the content of heredoc */ 1536 s = pushs(SSTRING, ATEMP); 1537 s->start = s->str = ccp; 1538 source = s; 1539 if (yylex(sub) != LWORD) 1540 internal_errorf("herein: yylex"); 1541 source = osource; 1542 ccp = evalstr(yylval.cp, DOSCALAR | DOHEREDOC); 1543 } 1544 1545 if (resbuf == NULL) 1546 shf_puts(ccp, shf); 1547 else 1548 strdupx(*resbuf, ccp, APERM); 1549 1550 quitenv(NULL); 1551 return (0); 1552 } 1553 1554 int 1555 herein(struct ioword *iop, char **resbuf) 1556 { 1557 int fd = -1; 1558 struct shf *shf; 1559 struct temp *h; 1560 int i; 1561 1562 /* lexer substitution flags */ 1563 i = (iop->ioflag & IOEVAL) ? (ONEWORD | HEREDOC) : 0; 1564 1565 /* skip all the fd setup if we just want the value */ 1566 if (resbuf != NULL) 1567 return (hereinval(iop, i, resbuf, NULL)); 1568 1569 /* 1570 * Create temp file to hold content (done before newenv 1571 * so temp doesn't get removed too soon). 1572 */ 1573 h = maketemp(ATEMP, TT_HEREDOC_EXP, &e->temps); 1574 if (!(shf = h->shf) || (fd = binopen3(h->tffn, O_RDONLY, 0)) < 0) { 1575 i = errno; 1576 warningf(true, Tf_temp, 1577 !shf ? Tcreate : Topen, h->tffn, cstrerror(i)); 1578 if (shf) 1579 shf_close(shf); 1580 /* special to iosetup(): don't print error */ 1581 return (-2); 1582 } 1583 1584 if (hereinval(iop, i, NULL, shf) == -2) { 1585 close(fd); 1586 /* special to iosetup(): don't print error */ 1587 return (-2); 1588 } 1589 1590 if (shf_close(shf) == -1) { 1591 i = errno; 1592 close(fd); 1593 warningf(true, Tf_temp, 1594 Twrite, h->tffn, cstrerror(i)); 1595 /* special to iosetup(): don't print error */ 1596 return (-2); 1597 } 1598 1599 return (fd); 1600 } 1601 1602 /* 1603 * ksh special - the select command processing section 1604 * print the args in column form - assuming that we can 1605 */ 1606 static const char * 1607 do_selectargs(const char **ap, bool print_menu) 1608 { 1609 static const char *read_args[] = { 1610 Tread, "-r", "REPLY", NULL 1611 }; 1612 char *s; 1613 int i, argct; 1614 1615 for (argct = 0; ap[argct]; argct++) 1616 ; 1617 while (/* CONSTCOND */ 1) { 1618 /*- 1619 * Menu is printed if 1620 * - this is the first time around the select loop 1621 * - the user enters a blank line 1622 * - the REPLY parameter is empty 1623 */ 1624 if (print_menu || !*str_val(global("REPLY"))) 1625 pr_menu(ap); 1626 shellf(Tf_s, str_val(global("PS3"))); 1627 if (call_builtin(findcom(Tread, FC_BI), read_args, Tselect, 1628 false)) 1629 return (NULL); 1630 if (*(s = str_val(global("REPLY")))) 1631 return ((getn(s, &i) && i >= 1 && i <= argct) ? 1632 ap[i - 1] : null); 1633 print_menu = true; 1634 } 1635 } 1636 1637 struct select_menu_info { 1638 const char * const *args; 1639 int num_width; 1640 }; 1641 1642 /* format a single select menu item */ 1643 static void 1644 select_fmt_entry(char *buf, size_t buflen, unsigned int i, const void *arg) 1645 { 1646 const struct select_menu_info *smi = 1647 (const struct select_menu_info *)arg; 1648 1649 shf_snprintf(buf, buflen, "%*u) %s", 1650 smi->num_width, i + 1, smi->args[i]); 1651 } 1652 1653 /* 1654 * print a select style menu 1655 */ 1656 void 1657 pr_menu(const char * const *ap) 1658 { 1659 struct select_menu_info smi; 1660 const char * const *pp; 1661 size_t acols = 0, aocts = 0, i; 1662 unsigned int n; 1663 struct columnise_opts co; 1664 1665 /* 1666 * width/column calculations were done once and saved, but this 1667 * means select can't be used recursively so we re-calculate 1668 * each time (could save in a structure that is returned, but 1669 * it's probably not worth the bother) 1670 */ 1671 1672 /* 1673 * get dimensions of the list 1674 */ 1675 for (n = 0, pp = ap; *pp; n++, pp++) { 1676 i = strlen(*pp); 1677 if (i > aocts) 1678 aocts = i; 1679 i = utf_mbswidth(*pp); 1680 if (i > acols) 1681 acols = i; 1682 } 1683 1684 /* 1685 * we will print an index of the form "%d) " in front of 1686 * each entry, so get the maximum width of this 1687 */ 1688 for (i = n, smi.num_width = 1; i >= 10; i /= 10) 1689 smi.num_width++; 1690 1691 smi.args = ap; 1692 co.shf = shl_out; 1693 co.linesep = '\n'; 1694 co.prefcol = co.do_last = true; 1695 print_columns(&co, n, select_fmt_entry, (void *)&smi, 1696 smi.num_width + 2 + aocts, smi.num_width + 2 + acols); 1697 } 1698 1699 static void 1700 plain_fmt_entry(char *buf, size_t buflen, unsigned int i, const void *arg) 1701 { 1702 strlcpy(buf, ((const char * const *)arg)[i], buflen); 1703 } 1704 1705 void 1706 pr_list(struct columnise_opts *cop, char * const *ap) 1707 { 1708 size_t acols = 0, aocts = 0, i; 1709 unsigned int n; 1710 char * const *pp; 1711 1712 for (n = 0, pp = ap; *pp; n++, pp++) { 1713 i = strlen(*pp); 1714 if (i > aocts) 1715 aocts = i; 1716 i = utf_mbswidth(*pp); 1717 if (i > acols) 1718 acols = i; 1719 } 1720 1721 print_columns(cop, n, plain_fmt_entry, (const void *)ap, 1722 aocts, acols); 1723 } 1724 1725 /* 1726 * [[ ... ]] evaluation routines 1727 */ 1728 1729 /* 1730 * Test if the current token is a whatever. Accepts the current token if 1731 * it is. Returns 0 if it is not, non-zero if it is (in the case of 1732 * TM_UNOP and TM_BINOP, the returned value is a Test_op). 1733 */ 1734 static Test_op 1735 dbteste_isa(Test_env *te, Test_meta meta) 1736 { 1737 Test_op ret = TO_NONOP; 1738 bool uqword; 1739 const char *p; 1740 1741 if (!*te->pos.wp) 1742 return (meta == TM_END ? TO_NONNULL : TO_NONOP); 1743 1744 /* unquoted word? */ 1745 for (p = *te->pos.wp; *p == CHAR; p += 2) 1746 ; 1747 uqword = *p == EOS; 1748 1749 if (meta == TM_UNOP || meta == TM_BINOP) { 1750 if (uqword) { 1751 /* longer than the longest operator */ 1752 char buf[8]; 1753 char *q = buf; 1754 1755 p = *te->pos.wp; 1756 while (*p++ == CHAR && 1757 (size_t)(q - buf) < sizeof(buf) - 1) 1758 *q++ = *p++; 1759 *q = '\0'; 1760 ret = test_isop(meta, buf); 1761 } 1762 } else if (meta == TM_END) 1763 ret = TO_NONOP; 1764 else 1765 ret = (uqword && !strcmp(*te->pos.wp, 1766 dbtest_tokens[(int)meta])) ? TO_NONNULL : TO_NONOP; 1767 1768 /* Accept the token? */ 1769 if (ret != TO_NONOP) 1770 te->pos.wp++; 1771 1772 return (ret); 1773 } 1774 1775 static const char * 1776 dbteste_getopnd(Test_env *te, Test_op op, bool do_eval) 1777 { 1778 const char *s = *te->pos.wp; 1779 int flags = DOTILDE | DOSCALAR; 1780 1781 if (!s) 1782 return (NULL); 1783 1784 te->pos.wp++; 1785 1786 if (!do_eval) 1787 return (null); 1788 1789 if (op == TO_STEQL || op == TO_STNEQ) 1790 flags |= DOPAT; 1791 1792 return (evalstr(s, flags)); 1793 } 1794 1795 static void 1796 dbteste_error(Test_env *te, int offset, const char *msg) 1797 { 1798 te->flags |= TEF_ERROR; 1799 internal_warningf("dbteste_error: %s (offset %d)", msg, offset); 1800 } 1801
