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
9 * mirabilos <m@mirbsd.org>
10 *
11 * Provided that these terms and disclaimer and all copyright notices
12 * are retained or reproduced in an accompanying document, permission
13 * is granted to deal in this work without restriction, including un-
14 * limited rights to use, publicly perform, distribute, sell, modify,
15 * merge, give away, or sublicence.
16 *
17 * This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
18 * the utmost extent permitted by applicable law, neither express nor
19 * implied; without malicious intent or gross negligence. In no event
20 * may a licensor, author or contributor be held liable for indirect,
21 * direct, other damage, loss, or other issues arising in any way out
22 * of dealing in the work, even if advised of the possibility of such
23 * damage or existence of a defect, except proven that it results out
24 * of said person's immediate fault when using the work as intended.
25 */
26
27 #define EXTERN
28 #include "sh.h"
29
30 #if HAVE_LANGINFO_CODESET
31 #include <langinfo.h>
32 #endif
33 #if HAVE_SETLOCALE_CTYPE
34 #include <locale.h>
35 #endif
36
37 __RCSID("$MirOS: src/bin/mksh/main.c,v 1.306 2015/10/09 21:36:57 tg Exp $");
38
39 extern char **environ;
40
41 #ifndef MKSHRC_PATH
42 #define MKSHRC_PATH "~/.mkshrc"
43 #endif
44
45 #ifndef MKSH_DEFAULT_TMPDIR
46 #define MKSH_DEFAULT_TMPDIR MKSH_UNIXROOT "/tmp"
47 #endif
48
49 static uint8_t isuc(const char *);
50 static int main_init(int, const char *[], Source **, struct block **);
51 void chvt_reinit(void);
52 static void reclaim(void);
53 static void remove_temps(struct temp *);
54 static mksh_uari_t rndsetup(void);
55 #ifdef SIGWINCH
56 static void x_sigwinch(int);
57 #endif
58
59 static const char initifs[] = "IFS= \t\n";
60
61 static const char initsubs[] =
62 "${PS2=> } ${PS3=#? } ${PS4=+ } ${SECONDS=0} ${TMOUT=0} ${EPOCHREALTIME=}";
63
64 static const char *initcoms[] = {
65 Ttypeset, "-r", initvsn, NULL,
66 Ttypeset, "-x", "HOME", "PATH", "SHELL", NULL,
67 Ttypeset, "-i10", "COLUMNS", "LINES", "SECONDS", "TMOUT", NULL,
68 Talias,
69 "integer=\\typeset -i",
70 "local=\\typeset",
71 /* not "alias -t --": hash -r needs to work */
72 "hash=\\builtin alias -t",
73 "type=\\builtin whence -v",
74 "autoload=\\typeset -fu",
75 "functions=\\typeset -f",
76 "history=\\builtin fc -l",
77 "nameref=\\typeset -n",
78 "nohup=nohup ",
79 "r=\\builtin fc -e -",
80 "login=\\exec login",
81 NULL,
82 /* this is what AT&T ksh seems to track, with the addition of emacs */
83 Talias, "-tU",
84 Tcat, "cc", "chmod", "cp", "date", "ed", "emacs", "grep", "ls",
85 "make", "mv", "pr", "rm", "sed", "sh", "vi", "who", NULL,
86 NULL
87 };
88
89 static const char *restr_com[] = {
90 Ttypeset, "-r", "PATH", "ENV", "SHELL", NULL
91 };
92
93 static bool initio_done;
94
95 /* top-level parsing and execution environment */
96 static struct env env;
97 struct env *e = &env;
98
99 static mksh_uari_t
rndsetup(void)100 rndsetup(void)
101 {
102 register uint32_t h;
103 struct {
104 ALLOC_ITEM alloc_INT;
105 void *dataptr, *stkptr, *mallocptr;
106 #if defined(__GLIBC__) && (__GLIBC__ >= 2)
107 sigjmp_buf jbuf;
108 #endif
109 struct timeval tv;
110 } *bufptr;
111 char *cp;
112
113 cp = alloc(sizeof(*bufptr) - ALLOC_SIZE, APERM);
114 #ifdef DEBUG
115 /* clear the allocated space, for valgrind */
116 memset(cp, 0, sizeof(*bufptr) - ALLOC_SIZE);
117 #endif
118 /* undo what alloc() did to the malloc result address */
119 bufptr = (void *)(cp - ALLOC_SIZE);
120 /* PIE or something similar provides us with deltas here */
121 bufptr->dataptr = &rndsetupstate;
122 /* ASLR in at least Windows, Linux, some BSDs */
123 bufptr->stkptr = &bufptr;
124 /* randomised malloc in BSD (and possibly others) */
125 bufptr->mallocptr = bufptr;
126 #if defined(__GLIBC__) && (__GLIBC__ >= 2)
127 /* glibc pointer guard */
128 sigsetjmp(bufptr->jbuf, 1);
129 #endif
130 /* introduce variation (and yes, second arg MBZ for portability) */
131 mksh_TIME(bufptr->tv);
132
133 h = chvt_rndsetup(bufptr, sizeof(*bufptr));
134
135 afree(cp, APERM);
136 return ((mksh_uari_t)h);
137 }
138
139 void
chvt_reinit(void)140 chvt_reinit(void)
141 {
142 kshpid = procpid = getpid();
143 ksheuid = geteuid();
144 kshpgrp = getpgrp();
145 kshppid = getppid();
146 }
147
148 static const char *empty_argv[] = {
149 "mksh", NULL
150 };
151
152 static uint8_t
isuc(const char * cx)153 isuc(const char *cx) {
154 char *cp, *x;
155 uint8_t rv = 0;
156
157 if (!cx || !*cx)
158 return (0);
159
160 /* uppercase a string duplicate */
161 strdupx(x, cx, ATEMP);
162 cp = x;
163 while ((*cp = ksh_toupper(*cp)))
164 ++cp;
165
166 /* check for UTF-8 */
167 if (strstr(x, "UTF-8") || strstr(x, "UTF8"))
168 rv = 1;
169
170 /* free copy and out */
171 afree(x, ATEMP);
172 return (rv);
173 }
174
175 static int
main_init(int argc,const char * argv[],Source ** sp,struct block ** lp)176 main_init(int argc, const char *argv[], Source **sp, struct block **lp)
177 {
178 int argi, i;
179 Source *s = NULL;
180 struct block *l;
181 unsigned char restricted_shell, errexit, utf_flag;
182 char *cp;
183 const char *ccp, **wp;
184 struct tbl *vp;
185 struct stat s_stdin;
186 #if !defined(_PATH_DEFPATH) && defined(_CS_PATH)
187 ssize_t k;
188 #endif
189
190 #ifdef __OS2__
191 for (i = 0; i < 3; ++i)
192 if (!isatty(i))
193 setmode(i, O_BINARY);
194 #endif
195
196 /* do things like getpgrp() et al. */
197 chvt_reinit();
198
199 /* make sure argv[] is sane, for weird OSes */
200 if (!*argv) {
201 argv = empty_argv;
202 argc = 1;
203 }
204 kshname = argv[0];
205
206 /* initialise permanent Area */
207 ainit(&aperm);
208
209 /* set up base environment */
210 env.type = E_NONE;
211 ainit(&env.area);
212 /* set up global l->vars and l->funs */
213 newblock();
214
215 /* Do this first so output routines (eg, errorf, shellf) can work */
216 initio();
217
218 /* determine the basename (without '-' or path) of the executable */
219 ccp = kshname;
220 goto begin_parse_kshname;
221 while ((i = ccp[argi++])) {
222 if (i == '/') {
223 ccp += argi;
224 begin_parse_kshname:
225 argi = 0;
226 if (*ccp == '-')
227 ++ccp;
228 }
229 }
230 if (!*ccp)
231 ccp = empty_argv[0];
232
233 /*
234 * Turn on nohup by default. (AT&T ksh does not have a nohup
235 * option - it always sends the hup).
236 */
237 Flag(FNOHUP) = 1;
238
239 /*
240 * Turn on brace expansion by default. AT&T kshs that have
241 * alternation always have it on.
242 */
243 Flag(FBRACEEXPAND) = 1;
244
245 /*
246 * Turn on "set -x" inheritance by default.
247 */
248 Flag(FXTRACEREC) = 1;
249
250 /* define built-in commands and see if we were called as one */
251 ktinit(APERM, &builtins,
252 /* currently up to 54 builtins: 75% of 128 = 2^7 */
253 7);
254 for (i = 0; mkshbuiltins[i].name != NULL; i++)
255 if (!strcmp(ccp, builtin(mkshbuiltins[i].name,
256 mkshbuiltins[i].func)))
257 Flag(FAS_BUILTIN) = 1;
258
259 if (!Flag(FAS_BUILTIN)) {
260 /* check for -T option early */
261 argi = parse_args(argv, OF_FIRSTTIME, NULL);
262 if (argi < 0)
263 return (1);
264
265 #if defined(MKSH_BINSHPOSIX) || defined(MKSH_BINSHREDUCED)
266 /* are we called as -sh or /bin/sh or so? */
267 if (!strcmp(ccp, "sh" MKSH_EXE_EXT)) {
268 /* either also turns off braceexpand */
269 #ifdef MKSH_BINSHPOSIX
270 /* enable better POSIX conformance */
271 change_flag(FPOSIX, OF_FIRSTTIME, true);
272 #endif
273 #ifdef MKSH_BINSHREDUCED
274 /* enable kludge/compat mode */
275 change_flag(FSH, OF_FIRSTTIME, true);
276 #endif
277 }
278 #endif
279 }
280
281 initvar();
282
283 initctypes();
284
285 inittraps();
286
287 coproc_init();
288
289 /* set up variable and command dictionaries */
290 ktinit(APERM, &taliases, 0);
291 ktinit(APERM, &aliases, 0);
292 #ifndef MKSH_NOPWNAM
293 ktinit(APERM, &homedirs, 0);
294 #endif
295
296 /* define shell keywords */
297 initkeywords();
298
299 init_histvec();
300
301 /* initialise tty size before importing environment */
302 change_winsz();
303
304 #ifdef _PATH_DEFPATH
305 def_path = _PATH_DEFPATH;
306 #else
307 #ifdef _CS_PATH
308 if ((k = confstr(_CS_PATH, NULL, 0)) > 0 &&
309 confstr(_CS_PATH, cp = alloc(k + 1, APERM), k + 1) == k + 1)
310 def_path = cp;
311 else
312 #endif
313 /*
314 * this is uniform across all OSes unless it
315 * breaks somewhere; don't try to optimise,
316 * e.g. add stuff for Interix or remove /usr
317 * for HURD, because e.g. Debian GNU/HURD is
318 * "keeping a regular /usr"; this is supposed
319 * to be a sane 'basic' default PATH
320 */
321 def_path = MKSH_UNIXROOT "/bin" MKSH_PATHSEPS
322 MKSH_UNIXROOT "/usr/bin" MKSH_PATHSEPS
323 MKSH_UNIXROOT "/sbin" MKSH_PATHSEPS
324 MKSH_UNIXROOT "/usr/sbin";
325 #endif
326
327 /*
328 * Set PATH to def_path (will set the path global variable).
329 * (import of environment below will probably change this setting).
330 */
331 vp = global("PATH");
332 /* setstr can't fail here */
333 setstr(vp, def_path, KSH_RETURN_ERROR);
334
335 #ifndef MKSH_NO_CMDLINE_EDITING
336 /*
337 * Set edit mode to emacs by default, may be overridden
338 * by the environment or the user. Also, we want tab completion
339 * on in vi by default.
340 */
341 change_flag(FEMACS, OF_SPECIAL, true);
342 #if !MKSH_S_NOVI
343 Flag(FVITABCOMPLETE) = 1;
344 #endif
345 #endif
346
347 /* import environment */
348 if (environ != NULL) {
349 wp = (const char **)environ;
350 while (*wp != NULL) {
351 rndpush(*wp);
352 typeset(*wp, IMPORT | EXPORT, 0, 0, 0);
353 ++wp;
354 }
355 }
356
357 /* for security */
358 typeset(initifs, 0, 0, 0, 0);
359
360 /* assign default shell variable values */
361 substitute(initsubs, 0);
362
363 /* Figure out the current working directory and set $PWD */
364 vp = global("PWD");
365 cp = str_val(vp);
366 /* Try to use existing $PWD if it is valid */
367 set_current_wd((mksh_abspath(cp) && test_eval(NULL, TO_FILEQ, cp, ".",
368 true)) ? cp : NULL);
369 if (current_wd[0])
370 simplify_path(current_wd);
371 /* Only set pwd if we know where we are or if it had a bogus value */
372 if (current_wd[0] || *cp)
373 /* setstr can't fail here */
374 setstr(vp, current_wd, KSH_RETURN_ERROR);
375
376 for (wp = initcoms; *wp != NULL; wp++) {
377 shcomexec(wp);
378 while (*wp != NULL)
379 wp++;
380 }
381 setint_n(global("OPTIND"), 1, 10);
382
383 kshuid = getuid();
384 kshgid = getgid();
385 kshegid = getegid();
386
387 safe_prompt = ksheuid ? "$ " : "# ";
388 vp = global("PS1");
389 /* Set PS1 if unset or we are root and prompt doesn't contain a # */
390 if (!(vp->flag & ISSET) ||
391 (!ksheuid && !strchr(str_val(vp), '#')))
392 /* setstr can't fail here */
393 setstr(vp, safe_prompt, KSH_RETURN_ERROR);
394 setint_n((vp = global("BASHPID")), 0, 10);
395 vp->flag |= INT_U;
396 setint_n((vp = global("PGRP")), (mksh_uari_t)kshpgrp, 10);
397 vp->flag |= INT_U;
398 setint_n((vp = global("PPID")), (mksh_uari_t)kshppid, 10);
399 vp->flag |= INT_U;
400 setint_n((vp = global("USER_ID")), (mksh_uari_t)ksheuid, 10);
401 vp->flag |= INT_U;
402 setint_n((vp = global("KSHUID")), (mksh_uari_t)kshuid, 10);
403 vp->flag |= INT_U;
404 setint_n((vp = global("KSHEGID")), (mksh_uari_t)kshegid, 10);
405 vp->flag |= INT_U;
406 setint_n((vp = global("KSHGID")), (mksh_uari_t)kshgid, 10);
407 vp->flag |= INT_U;
408 setint_n((vp = global("RANDOM")), rndsetup(), 10);
409 vp->flag |= INT_U;
410 setint_n((vp_pipest = global("PIPESTATUS")), 0, 10);
411
412 /* Set this before parsing arguments */
413 Flag(FPRIVILEGED) = (kshuid != ksheuid || kshgid != kshegid) ? 2 : 0;
414
415 /* this to note if monitor is set on command line (see below) */
416 #ifndef MKSH_UNEMPLOYED
417 Flag(FMONITOR) = 127;
418 #endif
419 /* this to note if utf-8 mode is set on command line (see below) */
420 UTFMODE = 2;
421
422 if (!Flag(FAS_BUILTIN)) {
423 argi = parse_args(argv, OF_CMDLINE, NULL);
424 if (argi < 0)
425 return (1);
426 }
427
428 /* process this later only, default to off (hysterical raisins) */
429 utf_flag = UTFMODE;
430 UTFMODE = 0;
431
432 if (Flag(FAS_BUILTIN)) {
433 /* auto-detect from environment variables, always */
434 utf_flag = 3;
435 } else if (Flag(FCOMMAND)) {
436 s = pushs(SSTRINGCMDLINE, ATEMP);
437 if (!(s->start = s->str = argv[argi++]))
438 errorf("%s %s", "-c", "requires an argument");
439 while (*s->str) {
440 if (*s->str != ' ' && ctype(*s->str, C_QUOTE))
441 break;
442 s->str++;
443 }
444 if (!*s->str)
445 s->flags |= SF_MAYEXEC;
446 s->str = s->start;
447 #ifdef MKSH_MIDNIGHTBSD01ASH_COMPAT
448 /* compatibility to MidnightBSD 0.1 /bin/sh (kludge) */
449 if (Flag(FSH) && argv[argi] && !strcmp(argv[argi], "--"))
450 ++argi;
451 #endif
452 if (argv[argi])
453 kshname = argv[argi++];
454 } else if (argi < argc && !Flag(FSTDIN)) {
455 s = pushs(SFILE, ATEMP);
456 #ifdef __OS2__
457 /*
458 * A bug in OS/2 extproc (like shebang) handling makes
459 * it not pass the full pathname of a script, so we need
460 * to search for it. This changes the behaviour of a
461 * simple "mksh foo", but can't be helped.
462 */
463 s->file = search_path(argv[argi++], path, X_OK, NULL);
464 if (!s->file || !*s->file)
465 s->file = argv[argi - 1];
466 #else
467 s->file = argv[argi++];
468 #endif
469 s->u.shf = shf_open(s->file, O_RDONLY, 0,
470 SHF_MAPHI | SHF_CLEXEC);
471 if (s->u.shf == NULL) {
472 shl_stdout_ok = false;
473 warningf(true, "%s: %s", s->file, cstrerror(errno));
474 /* mandated by SUSv4 */
475 exstat = 127;
476 unwind(LERROR);
477 }
478 kshname = s->file;
479 } else {
480 Flag(FSTDIN) = 1;
481 s = pushs(SSTDIN, ATEMP);
482 s->file = "<stdin>";
483 s->u.shf = shf_fdopen(0, SHF_RD | can_seek(0),
484 NULL);
485 if (isatty(0) && isatty(2)) {
486 Flag(FTALKING) = Flag(FTALKING_I) = 1;
487 /* The following only if isatty(0) */
488 s->flags |= SF_TTY;
489 s->u.shf->flags |= SHF_INTERRUPT;
490 s->file = NULL;
491 }
492 }
493
494 /* this bizarreness is mandated by POSIX */
495 if (fstat(0, &s_stdin) >= 0 && S_ISCHR(s_stdin.st_mode) &&
496 Flag(FTALKING))
497 reset_nonblock(0);
498
499 /* initialise job control */
500 j_init();
501 /* do this after j_init() which calls tty_init_state() */
502 if (Flag(FTALKING)) {
503 if (utf_flag == 2) {
504 #ifndef MKSH_ASSUME_UTF8
505 /* auto-detect from locale or environment */
506 utf_flag = 4;
507 #else /* this may not be an #elif */
508 #if MKSH_ASSUME_UTF8
509 utf_flag = 1;
510 #else
511 /* always disable UTF-8 (for interactive) */
512 utf_flag = 0;
513 #endif
514 #endif
515 }
516 #ifndef MKSH_NO_CMDLINE_EDITING
517 x_init();
518 #endif
519 }
520
521 #ifdef SIGWINCH
522 sigtraps[SIGWINCH].flags |= TF_SHELL_USES;
523 setsig(&sigtraps[SIGWINCH], x_sigwinch,
524 SS_RESTORE_ORIG|SS_FORCE|SS_SHTRAP);
525 #endif
526
527 l = e->loc;
528 if (Flag(FAS_BUILTIN)) {
529 l->argc = argc;
530 l->argv = argv;
531 l->argv[0] = ccp;
532 } else {
533 l->argc = argc - argi;
534 /*
535 * allocate a new array because otherwise, when we modify
536 * it in-place, ps(1) output changes; the meaning of argc
537 * here is slightly different as it excludes kshname, and
538 * we add a trailing NULL sentinel as well
539 */
540 l->argv = alloc2(l->argc + 2, sizeof(void *), APERM);
541 l->argv[0] = kshname;
542 memcpy(&l->argv[1], &argv[argi], l->argc * sizeof(void *));
543 l->argv[l->argc + 1] = NULL;
544 getopts_reset(1);
545 }
546
547 /* divine the initial state of the utf8-mode Flag */
548 ccp = null;
549 switch (utf_flag) {
550
551 /* auto-detect from locale or environment */
552 case 4:
553 #if HAVE_SETLOCALE_CTYPE
554 ccp = setlocale(LC_CTYPE, "");
555 #if HAVE_LANGINFO_CODESET
556 if (!isuc(ccp))
557 ccp = nl_langinfo(CODESET);
558 #endif
559 if (!isuc(ccp))
560 ccp = null;
561 /* FALLTHROUGH */
562 #endif
563
564 /* auto-detect from environment */
565 case 3:
566 /* these were imported from environ earlier */
567 if (ccp == null)
568 ccp = str_val(global("LC_ALL"));
569 if (ccp == null)
570 ccp = str_val(global("LC_CTYPE"));
571 if (ccp == null)
572 ccp = str_val(global("LANG"));
573 UTFMODE = isuc(ccp);
574 break;
575
576 /* not set on command line, not FTALKING */
577 case 2:
578 /* unknown values */
579 default:
580 utf_flag = 0;
581 /* FALLTHROUGH */
582
583 /* known values */
584 case 1:
585 case 0:
586 UTFMODE = utf_flag;
587 break;
588 }
589
590 /* Disable during .profile/ENV reading */
591 restricted_shell = Flag(FRESTRICTED);
592 Flag(FRESTRICTED) = 0;
593 errexit = Flag(FERREXIT);
594 Flag(FERREXIT) = 0;
595
596 /*
597 * Do this before profile/$ENV so that if it causes problems in them,
598 * user will know why things broke.
599 */
600 if (!current_wd[0] && Flag(FTALKING))
601 warningf(false, "can't determine current directory");
602
603 if (Flag(FLOGIN))
604 include(MKSH_SYSTEM_PROFILE, 0, NULL, true);
605 if (!Flag(FPRIVILEGED)) {
606 if (Flag(FLOGIN))
607 include(substitute("$HOME/.profile", 0), 0, NULL, true);
608 if (Flag(FTALKING)) {
609 cp = substitute(substitute("${ENV:-" MKSHRC_PATH "}",
610 0), DOTILDE);
611 if (cp[0] != '\0')
612 include(cp, 0, NULL, true);
613 }
614 } else {
615 include(MKSH_SUID_PROFILE, 0, NULL, true);
616 /* turn off -p if not set explicitly */
617 if (Flag(FPRIVILEGED) != 1)
618 change_flag(FPRIVILEGED, OF_INTERNAL, false);
619 }
620
621 if (restricted_shell) {
622 shcomexec(restr_com);
623 /* After typeset command... */
624 Flag(FRESTRICTED) = 1;
625 }
626 Flag(FERREXIT) = errexit;
627
628 if (Flag(FTALKING) && s)
629 hist_init(s);
630 else
631 /* set after ENV */
632 Flag(FTRACKALL) = 1;
633
634 alarm_init();
635
636 *sp = s;
637 *lp = l;
638 return (0);
639 }
640
641 /* this indirection barrier reduces stack usage during normal operation */
642
643 int
main(int argc,const char * argv[])644 main(int argc, const char *argv[])
645 {
646 int rv;
647 Source *s;
648 struct block *l;
649
650 if ((rv = main_init(argc, argv, &s, &l)) == 0) {
651 if (Flag(FAS_BUILTIN)) {
652 rv = shcomexec(l->argv);
653 } else {
654 shell(s, true);
655 /* NOTREACHED */
656 }
657 }
658 return (rv);
659 }
660
661 int
include(const char * name,int argc,const char ** argv,bool intr_ok)662 include(const char *name, int argc, const char **argv, bool intr_ok)
663 {
664 Source *volatile s = NULL;
665 struct shf *shf;
666 const char **volatile old_argv;
667 volatile int old_argc;
668 int i;
669
670 shf = shf_open(name, O_RDONLY, 0, SHF_MAPHI | SHF_CLEXEC);
671 if (shf == NULL)
672 return (-1);
673
674 if (argv) {
675 old_argv = e->loc->argv;
676 old_argc = e->loc->argc;
677 } else {
678 old_argv = NULL;
679 old_argc = 0;
680 }
681 newenv(E_INCL);
682 if ((i = kshsetjmp(e->jbuf))) {
683 quitenv(s ? s->u.shf : NULL);
684 if (old_argv) {
685 e->loc->argv = old_argv;
686 e->loc->argc = old_argc;
687 }
688 switch (i) {
689 case LRETURN:
690 case LERROR:
691 /* see below */
692 return (exstat & 0xFF);
693 case LINTR:
694 /*
695 * intr_ok is set if we are including .profile or $ENV.
696 * If user ^Cs out, we don't want to kill the shell...
697 */
698 if (intr_ok && ((exstat & 0xFF) - 128) != SIGTERM)
699 return (1);
700 /* FALLTHROUGH */
701 case LEXIT:
702 case LLEAVE:
703 case LSHELL:
704 unwind(i);
705 /* NOTREACHED */
706 default:
707 internal_errorf("%s %d", "include", i);
708 /* NOTREACHED */
709 }
710 }
711 if (argv) {
712 e->loc->argv = argv;
713 e->loc->argc = argc;
714 }
715 s = pushs(SFILE, ATEMP);
716 s->u.shf = shf;
717 strdupx(s->file, name, ATEMP);
718 i = shell(s, false);
719 quitenv(s->u.shf);
720 if (old_argv) {
721 e->loc->argv = old_argv;
722 e->loc->argc = old_argc;
723 }
724 /* & 0xff to ensure value not -1 */
725 return (i & 0xFF);
726 }
727
728 /* spawn a command into a shell optionally keeping track of the line number */
729 int
command(const char * comm,int line)730 command(const char *comm, int line)
731 {
732 Source *s;
733
734 s = pushs(SSTRING, ATEMP);
735 s->start = s->str = comm;
736 s->line = line;
737 return (shell(s, false));
738 }
739
740 /*
741 * run the commands from the input source, returning status.
742 */
743 int
shell(Source * volatile s,volatile bool toplevel)744 shell(Source * volatile s, volatile bool toplevel)
745 {
746 struct op *t;
747 volatile bool wastty = tobool(s->flags & SF_TTY);
748 volatile uint8_t attempts = 13;
749 volatile bool interactive = Flag(FTALKING) && toplevel;
750 volatile bool sfirst = true;
751 Source *volatile old_source = source;
752 int i;
753
754 newenv(E_PARSE);
755 if (interactive)
756 really_exit = false;
757 switch ((i = kshsetjmp(e->jbuf))) {
758 case 0:
759 break;
760 case LINTR:
761 /* we get here if SIGINT not caught or ignored */
762 case LERROR:
763 case LSHELL:
764 if (interactive) {
765 if (i == LINTR)
766 shellf("\n");
767 /*
768 * Reset any eof that was read as part of a
769 * multiline command.
770 */
771 if (Flag(FIGNOREEOF) && s->type == SEOF && wastty)
772 s->type = SSTDIN;
773 /*
774 * Used by exit command to get back to
775 * top level shell. Kind of strange since
776 * interactive is set if we are reading from
777 * a tty, but to have stopped jobs, one only
778 * needs FMONITOR set (not FTALKING/SF_TTY)...
779 */
780 /* toss any input we have so far */
781 yyrecursive_pop(true);
782 s->start = s->str = null;
783 retrace_info = NULL;
784 herep = heres;
785 break;
786 }
787 /* FALLTHROUGH */
788 case LEXIT:
789 case LLEAVE:
790 case LRETURN:
791 source = old_source;
792 quitenv(NULL);
793 /* keep on going */
794 unwind(i);
795 /* NOTREACHED */
796 default:
797 source = old_source;
798 quitenv(NULL);
799 internal_errorf("%s %d", "shell", i);
800 /* NOTREACHED */
801 }
802 while (/* CONSTCOND */ 1) {
803 if (trap)
804 runtraps(0);
805
806 if (s->next == NULL) {
807 if (Flag(FVERBOSE))
808 s->flags |= SF_ECHO;
809 else
810 s->flags &= ~SF_ECHO;
811 }
812 if (interactive) {
813 j_notify();
814 set_prompt(PS1, s);
815 }
816 t = compile(s, sfirst);
817 if (interactive)
818 histsave(&s->line, NULL, HIST_FLUSH, true);
819 sfirst = false;
820 if (!t)
821 goto source_no_tree;
822 if (t->type == TEOF) {
823 if (wastty && Flag(FIGNOREEOF) && --attempts > 0) {
824 shellf("Use 'exit' to leave mksh\n");
825 s->type = SSTDIN;
826 } else if (wastty && !really_exit &&
827 j_stopped_running()) {
828 really_exit = true;
829 s->type = SSTDIN;
830 } else {
831 /*
832 * this for POSIX which says EXIT traps
833 * shall be taken in the environment
834 * immediately after the last command
835 * executed.
836 */
837 if (toplevel)
838 unwind(LEXIT);
839 break;
840 }
841 } else if ((s->flags & SF_MAYEXEC) && t->type == TCOM)
842 t->u.evalflags |= DOTCOMEXEC;
843 if (!Flag(FNOEXEC) || (s->flags & SF_TTY))
844 exstat = execute(t, 0, NULL) & 0xFF;
845
846 if (t->type != TEOF && interactive && really_exit)
847 really_exit = false;
848
849 source_no_tree:
850 reclaim();
851 }
852 quitenv(NULL);
853 source = old_source;
854 return (exstat & 0xFF);
855 }
856
857 /* return to closest error handler or shell(), exit if none found */
858 /* note: i MUST NOT be 0 */
859 void
unwind(int i)860 unwind(int i)
861 {
862 /*
863 * This is a kludge. We need to restore everything that was
864 * changed in the new environment, see cid 1005090337C7A669439
865 * and 10050903386452ACBF1, but fail to even save things most of
866 * the time. funcs.c:c_eval() changes FERREXIT temporarily to 0,
867 * which needs to be restored thus (related to Debian #696823).
868 * We did not save the shell flags, so we use a special or'd
869 * value here... this is mostly to clean up behind *other*
870 * callers of unwind(LERROR) here; exec.c has the regular case.
871 */
872 if (Flag(FERREXIT) & 0x80) {
873 /* GNU bash does not run this trapsig */
874 trapsig(ksh_SIGERR);
875 Flag(FERREXIT) &= ~0x80;
876 }
877
878 /* ordering for EXIT vs ERR is a bit odd (this is what AT&T ksh does) */
879 if (i == LEXIT || ((i == LERROR || i == LINTR) &&
880 sigtraps[ksh_SIGEXIT].trap &&
881 (!Flag(FTALKING) || Flag(FERREXIT)))) {
882 ++trap_nested;
883 runtrap(&sigtraps[ksh_SIGEXIT], trap_nested == 1);
884 --trap_nested;
885 i = LLEAVE;
886 } else if (Flag(FERREXIT) == 1 && (i == LERROR || i == LINTR)) {
887 ++trap_nested;
888 runtrap(&sigtraps[ksh_SIGERR], trap_nested == 1);
889 --trap_nested;
890 i = LLEAVE;
891 }
892
893 while (/* CONSTCOND */ 1) {
894 switch (e->type) {
895 case E_PARSE:
896 case E_FUNC:
897 case E_INCL:
898 case E_LOOP:
899 case E_ERRH:
900 kshlongjmp(e->jbuf, i);
901 /* NOTREACHED */
902 case E_NONE:
903 if (i == LINTR)
904 e->flags |= EF_FAKE_SIGDIE;
905 /* FALLTHROUGH */
906 default:
907 quitenv(NULL);
908 /*
909 * quitenv() may have reclaimed the memory
910 * used by source which will end badly when
911 * we jump to a function that expects it to
912 * be valid
913 */
914 source = NULL;
915 }
916 }
917 }
918
919 void
newenv(int type)920 newenv(int type)
921 {
922 struct env *ep;
923 char *cp;
924
925 /*
926 * struct env includes ALLOC_ITEM for alignment constraints
927 * so first get the actually used memory, then assign it
928 */
929 cp = alloc(sizeof(struct env) - ALLOC_SIZE, ATEMP);
930 /* undo what alloc() did to the malloc result address */
931 ep = (void *)(cp - ALLOC_SIZE);
932 /* initialise public members of struct env (not the ALLOC_ITEM) */
933 ainit(&ep->area);
934 ep->oenv = e;
935 ep->loc = e->loc;
936 ep->savefd = NULL;
937 ep->temps = NULL;
938 ep->yyrecursive_statep = NULL;
939 ep->type = type;
940 ep->flags = 0;
941 /* jump buffer is invalid because flags == 0 */
942 e = ep;
943 }
944
945 void
quitenv(struct shf * shf)946 quitenv(struct shf *shf)
947 {
948 struct env *ep = e;
949 char *cp;
950 int fd;
951
952 yyrecursive_pop(true);
953 while (ep->oenv && ep->oenv->loc != ep->loc)
954 popblock();
955 if (ep->savefd != NULL) {
956 for (fd = 0; fd < NUFILE; fd++)
957 /* if ep->savefd[fd] < 0, means fd was closed */
958 if (ep->savefd[fd])
959 restfd(fd, ep->savefd[fd]);
960 if (ep->savefd[2])
961 /* Clear any write errors */
962 shf_reopen(2, SHF_WR, shl_out);
963 }
964 /*
965 * Bottom of the stack.
966 * Either main shell is exiting or cleanup_parents_env() was called.
967 */
968 if (ep->oenv == NULL) {
969 #ifdef DEBUG_LEAKS
970 int i;
971 #endif
972
973 if (ep->type == E_NONE) {
974 /* Main shell exiting? */
975 #if HAVE_PERSISTENT_HISTORY
976 if (Flag(FTALKING))
977 hist_finish();
978 #endif
979 j_exit();
980 if (ep->flags & EF_FAKE_SIGDIE) {
981 int sig = (exstat & 0xFF) - 128;
982
983 /*
984 * ham up our death a bit (AT&T ksh
985 * only seems to do this for SIGTERM)
986 * Don't do it for SIGQUIT, since we'd
987 * dump a core..
988 */
989 if ((sig == SIGINT || sig == SIGTERM) &&
990 (kshpgrp == kshpid)) {
991 setsig(&sigtraps[sig], SIG_DFL,
992 SS_RESTORE_CURR | SS_FORCE);
993 kill(0, sig);
994 }
995 }
996 }
997 if (shf)
998 shf_close(shf);
999 reclaim();
1000 #ifdef DEBUG_LEAKS
1001 #ifndef MKSH_NO_CMDLINE_EDITING
1002 x_done();
1003 #endif
1004 #ifndef MKSH_NOPROSPECTOFWORK
1005 /* block at least SIGCHLD during/after afreeall */
1006 sigprocmask(SIG_BLOCK, &sm_sigchld, NULL);
1007 #endif
1008 afreeall(APERM);
1009 for (fd = 3; fd < NUFILE; fd++)
1010 if ((i = fcntl(fd, F_GETFD, 0)) != -1 &&
1011 (i & FD_CLOEXEC))
1012 close(fd);
1013 close(2);
1014 close(1);
1015 close(0);
1016 #endif
1017 exit(exstat & 0xFF);
1018 }
1019 if (shf)
1020 shf_close(shf);
1021 reclaim();
1022
1023 e = e->oenv;
1024
1025 /* free the struct env - tricky due to the ALLOC_ITEM inside */
1026 cp = (void *)ep;
1027 afree(cp + ALLOC_SIZE, ATEMP);
1028 }
1029
1030 /* Called after a fork to cleanup stuff left over from parents environment */
1031 void
cleanup_parents_env(void)1032 cleanup_parents_env(void)
1033 {
1034 struct env *ep;
1035 int fd;
1036
1037 /*
1038 * Don't clean up temporary files - parent will probably need them.
1039 * Also, can't easily reclaim memory since variables, etc. could be
1040 * anywhere.
1041 */
1042
1043 /* close all file descriptors hiding in savefd */
1044 for (ep = e; ep; ep = ep->oenv) {
1045 if (ep->savefd) {
1046 for (fd = 0; fd < NUFILE; fd++)
1047 if (ep->savefd[fd] > 0)
1048 close(ep->savefd[fd]);
1049 afree(ep->savefd, &ep->area);
1050 ep->savefd = NULL;
1051 }
1052 #ifdef DEBUG_LEAKS
1053 if (ep->type != E_NONE)
1054 ep->type = E_GONE;
1055 #endif
1056 }
1057 #ifndef DEBUG_LEAKS
1058 e->oenv = NULL;
1059 #endif
1060 }
1061
1062 /* Called just before an execve cleanup stuff temporary files */
1063 void
cleanup_proc_env(void)1064 cleanup_proc_env(void)
1065 {
1066 struct env *ep;
1067
1068 for (ep = e; ep; ep = ep->oenv)
1069 remove_temps(ep->temps);
1070 }
1071
1072 /* remove temp files and free ATEMP Area */
1073 static void
reclaim(void)1074 reclaim(void)
1075 {
1076 struct block *l;
1077
1078 while ((l = e->loc) && (!e->oenv || e->oenv->loc != l)) {
1079 e->loc = l->next;
1080 afreeall(&l->area);
1081 }
1082
1083 remove_temps(e->temps);
1084 e->temps = NULL;
1085 afreeall(&e->area);
1086 }
1087
1088 static void
remove_temps(struct temp * tp)1089 remove_temps(struct temp *tp)
1090 {
1091 for (; tp != NULL; tp = tp->next)
1092 if (tp->pid == procpid)
1093 unlink(tp->tffn);
1094 }
1095
1096 /*
1097 * Initialise tty_fd. Used for tracking the size of the terminal,
1098 * saving/resetting tty modes upon forground job completion, and
1099 * for setting up the tty process group. Return values:
1100 * 0 = got controlling tty
1101 * 1 = got terminal but no controlling tty
1102 * 2 = cannot find a terminal
1103 * 3 = cannot dup fd
1104 * 4 = cannot make fd close-on-exec
1105 * An existing tty_fd is cached if no "better" one could be found,
1106 * i.e. if tty_devtty was already set or the new would not set it.
1107 */
1108 int
tty_init_fd(void)1109 tty_init_fd(void)
1110 {
1111 int fd, rv, eno = 0;
1112 bool do_close = false, is_devtty = true;
1113
1114 if (tty_devtty) {
1115 /* already got a tty which is /dev/tty */
1116 return (0);
1117 }
1118
1119 #ifdef _UWIN
1120 /*XXX imake style */
1121 if (isatty(3)) {
1122 /* fd 3 on UWIN _is_ /dev/tty (or our controlling tty) */
1123 fd = 3;
1124 goto got_fd;
1125 }
1126 #endif
1127 if ((fd = open("/dev/tty", O_RDWR, 0)) >= 0) {
1128 do_close = true;
1129 goto got_fd;
1130 }
1131 eno = errno;
1132
1133 if (tty_fd >= 0) {
1134 /* already got a non-devtty one */
1135 rv = 1;
1136 goto out;
1137 }
1138 is_devtty = false;
1139
1140 if (isatty((fd = 0)) || isatty((fd = 2)))
1141 goto got_fd;
1142 /* cannot find one */
1143 rv = 2;
1144 /* assert: do_close == false */
1145 goto out;
1146
1147 got_fd:
1148 if ((rv = fcntl(fd, F_DUPFD, FDBASE)) < 0) {
1149 eno = errno;
1150 rv = 3;
1151 goto out;
1152 }
1153 if (fcntl(rv, F_SETFD, FD_CLOEXEC) < 0) {
1154 eno = errno;
1155 close(rv);
1156 rv = 4;
1157 goto out;
1158 }
1159 tty_fd = rv;
1160 tty_devtty = is_devtty;
1161 rv = eno = 0;
1162 out:
1163 if (do_close)
1164 close(fd);
1165 errno = eno;
1166 return (rv);
1167 }
1168
1169 /* A shell error occurred (eg, syntax error, etc.) */
1170
1171 #define VWARNINGF_ERRORPREFIX 1
1172 #define VWARNINGF_FILELINE 2
1173 #define VWARNINGF_BUILTIN 4
1174 #define VWARNINGF_INTERNAL 8
1175
1176 static void vwarningf(unsigned int, const char *, va_list)
1177 MKSH_A_FORMAT(__printf__, 2, 0);
1178
1179 static void
vwarningf(unsigned int flags,const char * fmt,va_list ap)1180 vwarningf(unsigned int flags, const char *fmt, va_list ap)
1181 {
1182 if (fmt) {
1183 if (flags & VWARNINGF_INTERNAL)
1184 shf_fprintf(shl_out, "internal error: ");
1185 if (flags & VWARNINGF_ERRORPREFIX)
1186 error_prefix(tobool(flags & VWARNINGF_FILELINE));
1187 if ((flags & VWARNINGF_BUILTIN) &&
1188 /* not set when main() calls parse_args() */
1189 builtin_argv0 && builtin_argv0 != kshname)
1190 shf_fprintf(shl_out, "%s: ", builtin_argv0);
1191 shf_vfprintf(shl_out, fmt, ap);
1192 shf_putchar('\n', shl_out);
1193 }
1194 shf_flush(shl_out);
1195 }
1196
1197 void
errorfx(int rc,const char * fmt,...)1198 errorfx(int rc, const char *fmt, ...)
1199 {
1200 va_list va;
1201
1202 exstat = rc;
1203
1204 /* debugging: note that stdout not valid */
1205 shl_stdout_ok = false;
1206
1207 va_start(va, fmt);
1208 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va);
1209 va_end(va);
1210 unwind(LERROR);
1211 }
1212
1213 void
errorf(const char * fmt,...)1214 errorf(const char *fmt, ...)
1215 {
1216 va_list va;
1217
1218 exstat = 1;
1219
1220 /* debugging: note that stdout not valid */
1221 shl_stdout_ok = false;
1222
1223 va_start(va, fmt);
1224 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va);
1225 va_end(va);
1226 unwind(LERROR);
1227 }
1228
1229 /* like errorf(), but no unwind is done */
1230 void
warningf(bool fileline,const char * fmt,...)1231 warningf(bool fileline, const char *fmt, ...)
1232 {
1233 va_list va;
1234
1235 va_start(va, fmt);
1236 vwarningf(VWARNINGF_ERRORPREFIX | (fileline ? VWARNINGF_FILELINE : 0),
1237 fmt, va);
1238 va_end(va);
1239 }
1240
1241 /*
1242 * Used by built-in utilities to prefix shell and utility name to message
1243 * (also unwinds environments for special builtins).
1244 */
1245 void
bi_errorf(const char * fmt,...)1246 bi_errorf(const char *fmt, ...)
1247 {
1248 va_list va;
1249
1250 /* debugging: note that stdout not valid */
1251 shl_stdout_ok = false;
1252
1253 exstat = 1;
1254
1255 va_start(va, fmt);
1256 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE |
1257 VWARNINGF_BUILTIN, fmt, va);
1258 va_end(va);
1259
1260 /*
1261 * POSIX special builtins and ksh special builtins cause
1262 * non-interactive shells to exit. XXX may not want LERROR here
1263 */
1264 if (builtin_spec) {
1265 builtin_argv0 = NULL;
1266 unwind(LERROR);
1267 }
1268 }
1269
1270 /* Called when something that shouldn't happen does */
1271 void
internal_errorf(const char * fmt,...)1272 internal_errorf(const char *fmt, ...)
1273 {
1274 va_list va;
1275
1276 va_start(va, fmt);
1277 vwarningf(VWARNINGF_INTERNAL, fmt, va);
1278 va_end(va);
1279 unwind(LERROR);
1280 }
1281
1282 void
internal_warningf(const char * fmt,...)1283 internal_warningf(const char *fmt, ...)
1284 {
1285 va_list va;
1286
1287 va_start(va, fmt);
1288 vwarningf(VWARNINGF_INTERNAL, fmt, va);
1289 va_end(va);
1290 }
1291
1292 /* used by error reporting functions to print "ksh: .kshrc[25]: " */
1293 void
error_prefix(bool fileline)1294 error_prefix(bool fileline)
1295 {
1296 /* Avoid foo: foo[2]: ... */
1297 if (!fileline || !source || !source->file ||
1298 strcmp(source->file, kshname) != 0)
1299 shf_fprintf(shl_out, "%s: ", kshname + (*kshname == '-'));
1300 if (fileline && source && source->file != NULL) {
1301 shf_fprintf(shl_out, "%s[%lu]: ", source->file,
1302 (unsigned long)(source->errline ?
1303 source->errline : source->line));
1304 source->errline = 0;
1305 }
1306 }
1307
1308 /* printf to shl_out (stderr) with flush */
1309 void
shellf(const char * fmt,...)1310 shellf(const char *fmt, ...)
1311 {
1312 va_list va;
1313
1314 if (!initio_done)
1315 /* shl_out may not be set up yet... */
1316 return;
1317 va_start(va, fmt);
1318 shf_vfprintf(shl_out, fmt, va);
1319 va_end(va);
1320 shf_flush(shl_out);
1321 }
1322
1323 /* printf to shl_stdout (stdout) */
1324 void
shprintf(const char * fmt,...)1325 shprintf(const char *fmt, ...)
1326 {
1327 va_list va;
1328
1329 if (!shl_stdout_ok)
1330 internal_errorf("shl_stdout not valid");
1331 va_start(va, fmt);
1332 shf_vfprintf(shl_stdout, fmt, va);
1333 va_end(va);
1334 }
1335
1336 /* test if we can seek backwards fd (returns 0 or SHF_UNBUF) */
1337 int
can_seek(int fd)1338 can_seek(int fd)
1339 {
1340 struct stat statb;
1341
1342 return (fstat(fd, &statb) == 0 && !S_ISREG(statb.st_mode) ?
1343 SHF_UNBUF : 0);
1344 }
1345
1346 #ifdef DF
1347 int shl_dbg_fd;
1348 #define NSHF_IOB 4
1349 #else
1350 #define NSHF_IOB 3
1351 #endif
1352 struct shf shf_iob[NSHF_IOB];
1353
1354 void
initio(void)1355 initio(void)
1356 {
1357 #ifdef DF
1358 const char *lfp;
1359 #endif
1360
1361 /* force buffer allocation */
1362 shf_fdopen(1, SHF_WR, shl_stdout);
1363 shf_fdopen(2, SHF_WR, shl_out);
1364 shf_fdopen(2, SHF_WR, shl_xtrace);
1365 #ifdef DF
1366 if ((lfp = getenv("SDMKSH_PATH")) == NULL) {
1367 if ((lfp = getenv("HOME")) == NULL || !mksh_abspath(lfp))
1368 errorf("cannot get home directory");
1369 lfp = shf_smprintf("%s/mksh-dbg.txt", lfp);
1370 }
1371
1372 if ((shl_dbg_fd = open(lfp, O_WRONLY | O_APPEND | O_CREAT, 0600)) < 0)
1373 errorf("cannot open debug output file %s", lfp);
1374 if (shl_dbg_fd < FDBASE) {
1375 int nfd;
1376
1377 nfd = fcntl(shl_dbg_fd, F_DUPFD, FDBASE);
1378 close(shl_dbg_fd);
1379 if ((shl_dbg_fd = nfd) == -1)
1380 errorf("cannot dup debug output file");
1381 }
1382 fcntl(shl_dbg_fd, F_SETFD, FD_CLOEXEC);
1383 shf_fdopen(shl_dbg_fd, SHF_WR, shl_dbg);
1384 DF("=== open ===");
1385 #endif
1386 initio_done = true;
1387 }
1388
1389 /* A dup2() with error checking */
1390 int
ksh_dup2(int ofd,int nfd,bool errok)1391 ksh_dup2(int ofd, int nfd, bool errok)
1392 {
1393 int rv;
1394
1395 if (((rv = dup2(ofd, nfd)) < 0) && !errok && (errno != EBADF))
1396 errorf("too many files open in shell");
1397
1398 #ifdef __ultrix
1399 /*XXX imake style */
1400 if (rv >= 0)
1401 fcntl(nfd, F_SETFD, 0);
1402 #endif
1403
1404 return (rv);
1405 }
1406
1407 /*
1408 * Move fd from user space (0 <= fd < 10) to shell space (fd >= 10),
1409 * set close-on-exec flag. See FDBASE in sh.h, maybe 24 not 10 here.
1410 */
1411 short
savefd(int fd)1412 savefd(int fd)
1413 {
1414 int nfd = fd;
1415
1416 if (fd < FDBASE && (nfd = fcntl(fd, F_DUPFD, FDBASE)) < 0 &&
1417 (errno == EBADF || errno == EPERM))
1418 return (-1);
1419 if (nfd < 0 || nfd > SHRT_MAX)
1420 errorf("too many files open in shell");
1421 fcntl(nfd, F_SETFD, FD_CLOEXEC);
1422 return ((short)nfd);
1423 }
1424
1425 void
restfd(int fd,int ofd)1426 restfd(int fd, int ofd)
1427 {
1428 if (fd == 2)
1429 shf_flush(&shf_iob[/* fd */ 2]);
1430 if (ofd < 0)
1431 /* original fd closed */
1432 close(fd);
1433 else if (fd != ofd) {
1434 /*XXX: what to do if this dup fails? */
1435 ksh_dup2(ofd, fd, true);
1436 close(ofd);
1437 }
1438 }
1439
1440 void
openpipe(int * pv)1441 openpipe(int *pv)
1442 {
1443 int lpv[2];
1444
1445 if (pipe(lpv) < 0)
1446 errorf("can't create pipe - try again");
1447 pv[0] = savefd(lpv[0]);
1448 if (pv[0] != lpv[0])
1449 close(lpv[0]);
1450 pv[1] = savefd(lpv[1]);
1451 if (pv[1] != lpv[1])
1452 close(lpv[1]);
1453 }
1454
1455 void
closepipe(int * pv)1456 closepipe(int *pv)
1457 {
1458 close(pv[0]);
1459 close(pv[1]);
1460 }
1461
1462 /*
1463 * Called by iosetup() (deals with 2>&4, etc.), c_read, c_print to turn
1464 * a string (the X in 2>&X, read -uX, print -uX) into a file descriptor.
1465 */
1466 int
check_fd(const char * name,int mode,const char ** emsgp)1467 check_fd(const char *name, int mode, const char **emsgp)
1468 {
1469 int fd = 0, fl;
1470
1471 if (name[0] == 'p' && !name[1])
1472 return (coproc_getfd(mode, emsgp));
1473 while (ksh_isdigit(*name)) {
1474 fd = fd * 10 + ksh_numdig(*name);
1475 if (fd >= FDBASE) {
1476 if (emsgp)
1477 *emsgp = "file descriptor too large";
1478 return (-1);
1479 }
1480 ++name;
1481 }
1482 if (*name) {
1483 if (emsgp)
1484 *emsgp = "illegal file descriptor name";
1485 return (-1);
1486 }
1487 if ((fl = fcntl(fd, F_GETFL, 0)) < 0) {
1488 if (emsgp)
1489 *emsgp = "bad file descriptor";
1490 return (-1);
1491 }
1492 fl &= O_ACCMODE;
1493 /*
1494 * X_OK is a kludge to disable this check for dups (x<&1):
1495 * historical shells never did this check (XXX don't know what
1496 * POSIX has to say).
1497 */
1498 if (!(mode & X_OK) && fl != O_RDWR && (
1499 ((mode & R_OK) && fl != O_RDONLY) ||
1500 ((mode & W_OK) && fl != O_WRONLY))) {
1501 if (emsgp)
1502 *emsgp = (fl == O_WRONLY) ?
1503 "fd not open for reading" :
1504 "fd not open for writing";
1505 return (-1);
1506 }
1507 return (fd);
1508 }
1509
1510 /* Called once from main */
1511 void
coproc_init(void)1512 coproc_init(void)
1513 {
1514 coproc.read = coproc.readw = coproc.write = -1;
1515 coproc.njobs = 0;
1516 coproc.id = 0;
1517 }
1518
1519 /* Called by c_read() when eof is read - close fd if it is the co-process fd */
1520 void
coproc_read_close(int fd)1521 coproc_read_close(int fd)
1522 {
1523 if (coproc.read >= 0 && fd == coproc.read) {
1524 coproc_readw_close(fd);
1525 close(coproc.read);
1526 coproc.read = -1;
1527 }
1528 }
1529
1530 /*
1531 * Called by c_read() and by iosetup() to close the other side of the
1532 * read pipe, so reads will actually terminate.
1533 */
1534 void
coproc_readw_close(int fd)1535 coproc_readw_close(int fd)
1536 {
1537 if (coproc.readw >= 0 && coproc.read >= 0 && fd == coproc.read) {
1538 close(coproc.readw);
1539 coproc.readw = -1;
1540 }
1541 }
1542
1543 /*
1544 * Called by c_print when a write to a fd fails with EPIPE and by iosetup
1545 * when co-process input is dup'd
1546 */
1547 void
coproc_write_close(int fd)1548 coproc_write_close(int fd)
1549 {
1550 if (coproc.write >= 0 && fd == coproc.write) {
1551 close(coproc.write);
1552 coproc.write = -1;
1553 }
1554 }
1555
1556 /*
1557 * Called to check for existence of/value of the co-process file descriptor.
1558 * (Used by check_fd() and by c_read/c_print to deal with -p option).
1559 */
1560 int
coproc_getfd(int mode,const char ** emsgp)1561 coproc_getfd(int mode, const char **emsgp)
1562 {
1563 int fd = (mode & R_OK) ? coproc.read : coproc.write;
1564
1565 if (fd >= 0)
1566 return (fd);
1567 if (emsgp)
1568 *emsgp = "no coprocess";
1569 return (-1);
1570 }
1571
1572 /*
1573 * called to close file descriptors related to the coprocess (if any)
1574 * Should be called with SIGCHLD blocked.
1575 */
1576 void
coproc_cleanup(int reuse)1577 coproc_cleanup(int reuse)
1578 {
1579 /* This to allow co-processes to share output pipe */
1580 if (!reuse || coproc.readw < 0 || coproc.read < 0) {
1581 if (coproc.read >= 0) {
1582 close(coproc.read);
1583 coproc.read = -1;
1584 }
1585 if (coproc.readw >= 0) {
1586 close(coproc.readw);
1587 coproc.readw = -1;
1588 }
1589 }
1590 if (coproc.write >= 0) {
1591 close(coproc.write);
1592 coproc.write = -1;
1593 }
1594 }
1595
1596 struct temp *
maketemp(Area * ap,Temp_type type,struct temp ** tlist)1597 maketemp(Area *ap, Temp_type type, struct temp **tlist)
1598 {
1599 char *cp;
1600 size_t len;
1601 int i, j;
1602 struct temp *tp;
1603 const char *dir;
1604 struct stat sb;
1605
1606 dir = tmpdir ? tmpdir : MKSH_DEFAULT_TMPDIR;
1607 /* add "/shXXXXXX.tmp" plus NUL */
1608 len = strlen(dir);
1609 checkoktoadd(len, offsetof(struct temp, tffn[0]) + 14);
1610 tp = alloc(offsetof(struct temp, tffn[0]) + 14 + len, ap);
1611
1612 tp->shf = NULL;
1613 tp->pid = procpid;
1614 tp->type = type;
1615
1616 if (stat(dir, &sb) || !S_ISDIR(sb.st_mode)) {
1617 tp->tffn[0] = '\0';
1618 goto maketemp_out;
1619 }
1620
1621 cp = (void *)tp;
1622 cp += offsetof(struct temp, tffn[0]);
1623 memcpy(cp, dir, len);
1624 cp += len;
1625 memcpy(cp, "/shXXXXXX.tmp", 14);
1626 /* point to the first of six Xes */
1627 cp += 3;
1628
1629 /* cyclically attempt to open a temporary file */
1630 do {
1631 /* generate random part of filename */
1632 len = 0;
1633 do {
1634 cp[len++] = digits_lc[rndget() % 36];
1635 } while (len < 6);
1636
1637 /* check if this one works */
1638 if ((i = binopen3(tp->tffn, O_CREAT | O_EXCL | O_RDWR,
1639 0600)) < 0 && errno != EEXIST)
1640 goto maketemp_out;
1641 } while (i < 0);
1642
1643 if (type == TT_FUNSUB) {
1644 /* map us high and mark as close-on-exec */
1645 if ((j = savefd(i)) != i) {
1646 close(i);
1647 i = j;
1648 }
1649
1650 /* operation mode for the shf */
1651 j = SHF_RD;
1652 } else
1653 j = SHF_WR;
1654
1655 /* shf_fdopen cannot fail, so no fd leak */
1656 tp->shf = shf_fdopen(i, j, NULL);
1657
1658 maketemp_out:
1659 tp->next = *tlist;
1660 *tlist = tp;
1661 return (tp);
1662 }
1663
1664 /*
1665 * We use a similar collision resolution algorithm as Python 2.5.4
1666 * but with a slightly tweaked implementation written from scratch.
1667 */
1668
1669 #define INIT_TBLSHIFT 3 /* initial table shift (2^3 = 8) */
1670 #define PERTURB_SHIFT 5 /* see Python 2.5.4 Objects/dictobject.c */
1671
1672 static void tgrow(struct table *);
1673 static int tnamecmp(const void *, const void *);
1674
1675 static void
tgrow(struct table * tp)1676 tgrow(struct table *tp)
1677 {
1678 size_t i, j, osize, mask, perturb;
1679 struct tbl *tblp, **pp;
1680 struct tbl **ntblp, **otblp = tp->tbls;
1681
1682 if (tp->tshift > 29)
1683 internal_errorf("hash table size limit reached");
1684
1685 /* calculate old size, new shift and new size */
1686 osize = (size_t)1 << (tp->tshift++);
1687 i = osize << 1;
1688
1689 ntblp = alloc2(i, sizeof(struct tbl *), tp->areap);
1690 /* multiplication cannot overflow: alloc2 checked that */
1691 memset(ntblp, 0, i * sizeof(struct tbl *));
1692
1693 /* table can get very full when reaching its size limit */
1694 tp->nfree = (tp->tshift == 30) ? 0x3FFF0000UL :
1695 /* but otherwise, only 75% */
1696 ((i * 3) / 4);
1697 tp->tbls = ntblp;
1698 if (otblp == NULL)
1699 return;
1700
1701 mask = i - 1;
1702 for (i = 0; i < osize; i++)
1703 if ((tblp = otblp[i]) != NULL) {
1704 if ((tblp->flag & DEFINED)) {
1705 /* search for free hash table slot */
1706 j = perturb = tblp->ua.hval;
1707 goto find_first_empty_slot;
1708 find_next_empty_slot:
1709 j = (j << 2) + j + perturb + 1;
1710 perturb >>= PERTURB_SHIFT;
1711 find_first_empty_slot:
1712 pp = &ntblp[j & mask];
1713 if (*pp != NULL)
1714 goto find_next_empty_slot;
1715 /* found an empty hash table slot */
1716 *pp = tblp;
1717 tp->nfree--;
1718 } else if (!(tblp->flag & FINUSE)) {
1719 afree(tblp, tp->areap);
1720 }
1721 }
1722 afree(otblp, tp->areap);
1723 }
1724
1725 void
ktinit(Area * ap,struct table * tp,uint8_t initshift)1726 ktinit(Area *ap, struct table *tp, uint8_t initshift)
1727 {
1728 tp->areap = ap;
1729 tp->tbls = NULL;
1730 tp->tshift = ((initshift > INIT_TBLSHIFT) ?
1731 initshift : INIT_TBLSHIFT) - 1;
1732 tgrow(tp);
1733 }
1734
1735 /* table, name (key) to search for, hash(name), rv pointer to tbl ptr */
1736 struct tbl *
ktscan(struct table * tp,const char * name,uint32_t h,struct tbl *** ppp)1737 ktscan(struct table *tp, const char *name, uint32_t h, struct tbl ***ppp)
1738 {
1739 size_t j, perturb, mask;
1740 struct tbl **pp, *p;
1741
1742 mask = ((size_t)1 << (tp->tshift)) - 1;
1743 /* search for hash table slot matching name */
1744 j = perturb = h;
1745 goto find_first_slot;
1746 find_next_slot:
1747 j = (j << 2) + j + perturb + 1;
1748 perturb >>= PERTURB_SHIFT;
1749 find_first_slot:
1750 pp = &tp->tbls[j & mask];
1751 if ((p = *pp) != NULL && (p->ua.hval != h || !(p->flag & DEFINED) ||
1752 strcmp(p->name, name)))
1753 goto find_next_slot;
1754 /* p == NULL if not found, correct found entry otherwise */
1755 if (ppp)
1756 *ppp = pp;
1757 return (p);
1758 }
1759
1760 /* table, name (key) to enter, hash(n) */
1761 struct tbl *
ktenter(struct table * tp,const char * n,uint32_t h)1762 ktenter(struct table *tp, const char *n, uint32_t h)
1763 {
1764 struct tbl **pp, *p;
1765 size_t len;
1766
1767 Search:
1768 if ((p = ktscan(tp, n, h, &pp)))
1769 return (p);
1770
1771 if (tp->nfree == 0) {
1772 /* too full */
1773 tgrow(tp);
1774 goto Search;
1775 }
1776
1777 /* create new tbl entry */
1778 len = strlen(n);
1779 checkoktoadd(len, offsetof(struct tbl, name[0]) + 1);
1780 p = alloc(offsetof(struct tbl, name[0]) + ++len, tp->areap);
1781 p->flag = 0;
1782 p->type = 0;
1783 p->areap = tp->areap;
1784 p->ua.hval = h;
1785 p->u2.field = 0;
1786 p->u.array = NULL;
1787 memcpy(p->name, n, len);
1788
1789 /* enter in tp->tbls */
1790 tp->nfree--;
1791 *pp = p;
1792 return (p);
1793 }
1794
1795 void
ktwalk(struct tstate * ts,struct table * tp)1796 ktwalk(struct tstate *ts, struct table *tp)
1797 {
1798 ts->left = (size_t)1 << (tp->tshift);
1799 ts->next = tp->tbls;
1800 }
1801
1802 struct tbl *
ktnext(struct tstate * ts)1803 ktnext(struct tstate *ts)
1804 {
1805 while (--ts->left >= 0) {
1806 struct tbl *p = *ts->next++;
1807 if (p != NULL && (p->flag & DEFINED))
1808 return (p);
1809 }
1810 return (NULL);
1811 }
1812
1813 static int
tnamecmp(const void * p1,const void * p2)1814 tnamecmp(const void *p1, const void *p2)
1815 {
1816 const struct tbl *a = *((const struct tbl * const *)p1);
1817 const struct tbl *b = *((const struct tbl * const *)p2);
1818
1819 return (strcmp(a->name, b->name));
1820 }
1821
1822 struct tbl **
ktsort(struct table * tp)1823 ktsort(struct table *tp)
1824 {
1825 size_t i;
1826 struct tbl **p, **sp, **dp;
1827
1828 /*
1829 * since the table is never entirely full, no need to reserve
1830 * additional space for the trailing NULL appended below
1831 */
1832 i = (size_t)1 << (tp->tshift);
1833 p = alloc2(i, sizeof(struct tbl *), ATEMP);
1834 sp = tp->tbls; /* source */
1835 dp = p; /* dest */
1836 while (i--)
1837 if ((*dp = *sp++) != NULL && (((*dp)->flag & DEFINED) ||
1838 ((*dp)->flag & ARRAY)))
1839 dp++;
1840 qsort(p, (i = dp - p), sizeof(struct tbl *), tnamecmp);
1841 p[i] = NULL;
1842 return (p);
1843 }
1844
1845 #ifdef SIGWINCH
1846 static void
x_sigwinch(int sig MKSH_A_UNUSED)1847 x_sigwinch(int sig MKSH_A_UNUSED)
1848 {
1849 /* this runs inside interrupt context, with errno saved */
1850
1851 got_winch = 1;
1852 }
1853 #endif
1854
1855 #ifdef DF
1856 void
DF(const char * fmt,...)1857 DF(const char *fmt, ...)
1858 {
1859 va_list args;
1860 struct timeval tv;
1861 mirtime_mjd mjd;
1862
1863 mksh_lockfd(shl_dbg_fd);
1864 mksh_TIME(tv);
1865 timet2mjd(&mjd, tv.tv_sec);
1866 shf_fprintf(shl_dbg, "[%02u:%02u:%02u (%u) %u.%06u] ",
1867 (unsigned)mjd.sec / 3600, ((unsigned)mjd.sec / 60) % 60,
1868 (unsigned)mjd.sec % 60, (unsigned)getpid(),
1869 (unsigned)tv.tv_sec, (unsigned)tv.tv_usec);
1870 va_start(args, fmt);
1871 shf_vfprintf(shl_dbg, fmt, args);
1872 va_end(args);
1873 shf_putc('\n', shl_dbg);
1874 shf_flush(shl_dbg);
1875 mksh_unlkfd(shl_dbg_fd);
1876 }
1877 #endif
1878
1879 void
x_mkraw(int fd,mksh_ttyst * ocb,bool forread)1880 x_mkraw(int fd, mksh_ttyst *ocb, bool forread)
1881 {
1882 mksh_ttyst cb;
1883
1884 if (ocb)
1885 mksh_tcget(fd, ocb);
1886 else
1887 ocb = &tty_state;
1888
1889 cb = *ocb;
1890 if (forread) {
1891 cb.c_iflag &= ~(ISTRIP);
1892 cb.c_lflag &= ~(ICANON) | ECHO;
1893 } else {
1894 cb.c_iflag &= ~(INLCR | ICRNL | ISTRIP);
1895 cb.c_lflag &= ~(ISIG | ICANON | ECHO);
1896 }
1897 #if defined(VLNEXT) && defined(_POSIX_VDISABLE)
1898 /* OSF/1 processes lnext when ~icanon */
1899 cb.c_cc[VLNEXT] = _POSIX_VDISABLE;
1900 #endif
1901 /* SunOS 4.1.x & OSF/1 processes discard(flush) when ~icanon */
1902 #if defined(VDISCARD) && defined(_POSIX_VDISABLE)
1903 cb.c_cc[VDISCARD] = _POSIX_VDISABLE;
1904 #endif
1905 cb.c_cc[VTIME] = 0;
1906 cb.c_cc[VMIN] = 1;
1907
1908 mksh_tcset(fd, &cb);
1909 }
1910