1 /* $OpenBSD: main.c,v 1.57 2015/09/10 22:48:58 nicm Exp $ */
2 /* $OpenBSD: tty.c,v 1.10 2014/08/10 02:44:26 guenther Exp $ */
3 /* $OpenBSD: io.c,v 1.26 2015/09/11 08:00:27 guenther Exp $ */
4 /* $OpenBSD: table.c,v 1.16 2015/09/01 13:12:31 tedu Exp $ */
5
6 /*-
7 * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
8 * 2011, 2012, 2013, 2014, 2015, 2016
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 1.322 2016/11/11 23:48:30 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=> }"
63 "${PS3=#? }"
64 "${PS4=+ }"
65 "${SECONDS=0}"
66 "${TMOUT=0}"
67 "${EPOCHREALTIME=}";
68
69 static const char *initcoms[] = {
70 Ttypeset, "-r", initvsn, NULL,
71 Ttypeset, "-x", "HOME", TPATH, TSHELL, NULL,
72 Ttypeset, "-i10", "COLUMNS", "LINES", "SECONDS", "TMOUT", NULL,
73 Talias,
74 "integer=\\typeset -i",
75 "local=\\typeset",
76 /* not "alias -t --": hash -r needs to work */
77 "hash=\\builtin alias -t",
78 "type=\\builtin whence -v",
79 "autoload=\\typeset -fu",
80 "functions=\\typeset -f",
81 "history=\\builtin fc -l",
82 "nameref=\\typeset -n",
83 "nohup=nohup ",
84 "r=\\builtin fc -e -",
85 "login=\\exec login",
86 NULL,
87 /* this is what AT&T ksh seems to track, with the addition of emacs */
88 Talias, "-tU",
89 Tcat, "cc", "chmod", "cp", "date", "ed", "emacs", "grep", "ls",
90 "make", "mv", "pr", "rm", "sed", Tsh, "vi", "who", NULL,
91 NULL
92 };
93
94 static const char *restr_com[] = {
95 Ttypeset, "-r", TPATH, "ENV", TSHELL, NULL
96 };
97
98 static bool initio_done;
99
100 /* top-level parsing and execution environment */
101 static struct env env;
102 struct env *e = &env;
103
104 static mksh_uari_t
rndsetup(void)105 rndsetup(void)
106 {
107 register uint32_t h;
108 struct {
109 ALLOC_ITEM alloc_INT;
110 void *dataptr, *stkptr, *mallocptr;
111 #if defined(__GLIBC__) && (__GLIBC__ >= 2)
112 sigjmp_buf jbuf;
113 #endif
114 struct timeval tv;
115 } *bufptr;
116 char *cp;
117
118 cp = alloc(sizeof(*bufptr) - sizeof(ALLOC_ITEM), APERM);
119 /* clear the allocated space, for valgrind and to avoid UB */
120 memset(cp, 0, sizeof(*bufptr) - sizeof(ALLOC_ITEM));
121 /* undo what alloc() did to the malloc result address */
122 bufptr = (void *)(cp - sizeof(ALLOC_ITEM));
123 /* PIE or something similar provides us with deltas here */
124 bufptr->dataptr = &rndsetupstate;
125 /* ASLR in at least Windows, Linux, some BSDs */
126 bufptr->stkptr = &bufptr;
127 /* randomised malloc in BSD (and possibly others) */
128 bufptr->mallocptr = bufptr;
129 #if defined(__GLIBC__) && (__GLIBC__ >= 2)
130 /* glibc pointer guard */
131 sigsetjmp(bufptr->jbuf, 1);
132 #endif
133 /* introduce variation (and yes, second arg MBZ for portability) */
134 mksh_TIME(bufptr->tv);
135
136 #ifdef MKSH_ALLOC_CATCH_UNDERRUNS
137 mprotect(((char *)bufptr) + 4096, 4096, PROT_READ | PROT_WRITE);
138 #endif
139 h = chvt_rndsetup(bufptr, sizeof(*bufptr));
140
141 afree(cp, APERM);
142 return ((mksh_uari_t)h);
143 }
144
145 void
chvt_reinit(void)146 chvt_reinit(void)
147 {
148 kshpid = procpid = getpid();
149 ksheuid = geteuid();
150 kshpgrp = getpgrp();
151 kshppid = getppid();
152 }
153
154 static const char *empty_argv[] = {
155 Tmksh, NULL
156 };
157
158 static uint8_t
isuc(const char * cx)159 isuc(const char *cx) {
160 char *cp, *x;
161 uint8_t rv = 0;
162
163 if (!cx || !*cx)
164 return (0);
165
166 /* uppercase a string duplicate */
167 strdupx(x, cx, ATEMP);
168 cp = x;
169 while ((*cp = ksh_toupper(*cp)))
170 ++cp;
171
172 /* check for UTF-8 */
173 if (strstr(x, "UTF-8") || strstr(x, "UTF8"))
174 rv = 1;
175
176 /* free copy and out */
177 afree(x, ATEMP);
178 return (rv);
179 }
180
181 static int
main_init(int argc,const char * argv[],Source ** sp,struct block ** lp)182 main_init(int argc, const char *argv[], Source **sp, struct block **lp)
183 {
184 int argi, i;
185 Source *s = NULL;
186 struct block *l;
187 unsigned char restricted_shell, errexit, utf_flag;
188 char *cp;
189 const char *ccp, **wp;
190 struct tbl *vp;
191 struct stat s_stdin;
192 #if !defined(_PATH_DEFPATH) && defined(_CS_PATH)
193 ssize_t k;
194 #endif
195
196 #ifdef __OS2__
197 for (i = 0; i < 3; ++i)
198 if (!isatty(i))
199 setmode(i, O_BINARY);
200 #endif
201
202 /* do things like getpgrp() et al. */
203 chvt_reinit();
204
205 /* make sure argv[] is sane, for weird OSes */
206 if (!*argv) {
207 argv = empty_argv;
208 argc = 1;
209 }
210 kshname = argv[0];
211
212 /* initialise permanent Area */
213 ainit(&aperm);
214 /* max. name length: -2147483648 = 11 (+ NUL) */
215 vtemp = alloc(offsetof(struct tbl, name[0]) + 12, APERM);
216
217 /* set up base environment */
218 env.type = E_NONE;
219 ainit(&env.area);
220 /* set up global l->vars and l->funs */
221 newblock();
222
223 /* Do this first so output routines (eg, errorf, shellf) can work */
224 initio();
225
226 /* determine the basename (without '-' or path) of the executable */
227 ccp = kshname;
228 goto begin_parsing_kshname;
229 while ((i = ccp[argi++])) {
230 if (mksh_cdirsep(i)) {
231 ccp += argi;
232 begin_parsing_kshname:
233 argi = 0;
234 if (*ccp == '-')
235 ++ccp;
236 }
237 }
238 if (!*ccp)
239 ccp = empty_argv[0];
240
241 /*
242 * Turn on nohup by default. (AT&T ksh does not have a nohup
243 * option - it always sends the hup).
244 */
245 Flag(FNOHUP) = 1;
246
247 /*
248 * Turn on brace expansion by default. AT&T kshs that have
249 * alternation always have it on.
250 */
251 Flag(FBRACEEXPAND) = 1;
252
253 /*
254 * Turn on "set -x" inheritance by default.
255 */
256 Flag(FXTRACEREC) = 1;
257
258 /* define built-in commands and see if we were called as one */
259 ktinit(APERM, &builtins,
260 /* currently up to 54 builtins: 75% of 128 = 2^7 */
261 7);
262 for (i = 0; mkshbuiltins[i].name != NULL; i++)
263 if (!strcmp(ccp, builtin(mkshbuiltins[i].name,
264 mkshbuiltins[i].func)))
265 Flag(FAS_BUILTIN) = 1;
266
267 if (!Flag(FAS_BUILTIN)) {
268 /* check for -T option early */
269 argi = parse_args(argv, OF_FIRSTTIME, NULL);
270 if (argi < 0)
271 return (1);
272
273 #if defined(MKSH_BINSHPOSIX) || defined(MKSH_BINSHREDUCED)
274 /* are we called as -sh or /bin/sh or so? */
275 if (!strcmp(ccp, "sh" MKSH_EXE_EXT)) {
276 /* either also turns off braceexpand */
277 #ifdef MKSH_BINSHPOSIX
278 /* enable better POSIX conformance */
279 change_flag(FPOSIX, OF_FIRSTTIME, true);
280 #endif
281 #ifdef MKSH_BINSHREDUCED
282 /* enable kludge/compat mode */
283 change_flag(FSH, OF_FIRSTTIME, true);
284 #endif
285 }
286 #endif
287 }
288
289 initvar();
290
291 initctypes();
292
293 inittraps();
294
295 coproc_init();
296
297 /* set up variable and command dictionaries */
298 ktinit(APERM, &taliases, 0);
299 ktinit(APERM, &aliases, 0);
300 #ifndef MKSH_NOPWNAM
301 ktinit(APERM, &homedirs, 0);
302 #endif
303
304 /* define shell keywords */
305 initkeywords();
306
307 init_histvec();
308
309 /* initialise tty size before importing environment */
310 change_winsz();
311
312 #ifdef _PATH_DEFPATH
313 def_path = _PATH_DEFPATH;
314 #else
315 #ifdef _CS_PATH
316 if ((k = confstr(_CS_PATH, NULL, 0)) > 0 &&
317 confstr(_CS_PATH, cp = alloc(k + 1, APERM), k + 1) == k + 1)
318 def_path = cp;
319 else
320 #endif
321 /*
322 * this is uniform across all OSes unless it
323 * breaks somewhere hard; don't try to optimise,
324 * e.g. add stuff for Interix or remove /usr
325 * for HURD, because e.g. Debian GNU/HURD is
326 * "keeping a regular /usr"; this is supposed
327 * to be a sane 'basic' default PATH
328 */
329 def_path = MKSH_UNIXROOT "/bin" MKSH_PATHSEPS
330 MKSH_UNIXROOT "/usr/bin" MKSH_PATHSEPS
331 MKSH_UNIXROOT "/sbin" MKSH_PATHSEPS
332 MKSH_UNIXROOT "/usr/sbin";
333 #endif
334
335 /*
336 * Set PATH to def_path (will set the path global variable).
337 * (import of environment below will probably change this setting).
338 */
339 vp = global(TPATH);
340 /* setstr can't fail here */
341 setstr(vp, def_path, KSH_RETURN_ERROR);
342
343 #ifndef MKSH_NO_CMDLINE_EDITING
344 /*
345 * Set edit mode to emacs by default, may be overridden
346 * by the environment or the user. Also, we want tab completion
347 * on in vi by default.
348 */
349 change_flag(FEMACS, OF_SPECIAL, true);
350 #if !MKSH_S_NOVI
351 Flag(FVITABCOMPLETE) = 1;
352 #endif
353 #endif
354
355 /* import environment */
356 if (environ != NULL) {
357 wp = (const char **)environ;
358 while (*wp != NULL) {
359 rndpush(*wp);
360 typeset(*wp, IMPORT | EXPORT, 0, 0, 0);
361 ++wp;
362 }
363 }
364
365 /* override default PATH regardless of environment */
366 #ifdef MKSH_DEFPATH_OVERRIDE
367 vp = global(TPATH);
368 setstr(vp, MKSH_DEFPATH_OVERRIDE, KSH_RETURN_ERROR);
369 #endif
370
371 /* for security */
372 typeset(initifs, 0, 0, 0, 0);
373
374 /* assign default shell variable values */
375 substitute(initsubs, 0);
376
377 /* Figure out the current working directory and set $PWD */
378 vp = global(TPWD);
379 cp = str_val(vp);
380 /* Try to use existing $PWD if it is valid */
381 set_current_wd((mksh_abspath(cp) && test_eval(NULL, TO_FILEQ, cp,
382 Tdot, true)) ? cp : NULL);
383 if (current_wd[0])
384 simplify_path(current_wd);
385 /* Only set pwd if we know where we are or if it had a bogus value */
386 if (current_wd[0] || *cp)
387 /* setstr can't fail here */
388 setstr(vp, current_wd, KSH_RETURN_ERROR);
389
390 for (wp = initcoms; *wp != NULL; wp++) {
391 shcomexec(wp);
392 while (*wp != NULL)
393 wp++;
394 }
395 setint_n(global("OPTIND"), 1, 10);
396
397 kshuid = getuid();
398 kshgid = getgid();
399 kshegid = getegid();
400
401 safe_prompt = ksheuid ? "$ " : "# ";
402 vp = global("PS1");
403 /* Set PS1 if unset or we are root and prompt doesn't contain a # */
404 if (!(vp->flag & ISSET) ||
405 (!ksheuid && !strchr(str_val(vp), '#')))
406 /* setstr can't fail here */
407 setstr(vp, safe_prompt, KSH_RETURN_ERROR);
408 setint_n((vp = global("BASHPID")), 0, 10);
409 vp->flag |= INT_U;
410 setint_n((vp = global("PGRP")), (mksh_uari_t)kshpgrp, 10);
411 vp->flag |= INT_U;
412 setint_n((vp = global("PPID")), (mksh_uari_t)kshppid, 10);
413 vp->flag |= INT_U;
414 setint_n((vp = global("USER_ID")), (mksh_uari_t)ksheuid, 10);
415 vp->flag |= INT_U;
416 setint_n((vp = global("KSHUID")), (mksh_uari_t)kshuid, 10);
417 vp->flag |= INT_U;
418 setint_n((vp = global("KSHEGID")), (mksh_uari_t)kshegid, 10);
419 vp->flag |= INT_U;
420 setint_n((vp = global("KSHGID")), (mksh_uari_t)kshgid, 10);
421 vp->flag |= INT_U;
422 setint_n((vp = global("RANDOM")), rndsetup(), 10);
423 vp->flag |= INT_U;
424 setint_n((vp_pipest = global("PIPESTATUS")), 0, 10);
425
426 /* Set this before parsing arguments */
427 Flag(FPRIVILEGED) = (kshuid != ksheuid || kshgid != kshegid) ? 2 : 0;
428
429 /* this to note if monitor is set on command line (see below) */
430 #ifndef MKSH_UNEMPLOYED
431 Flag(FMONITOR) = 127;
432 #endif
433 /* this to note if utf-8 mode is set on command line (see below) */
434 UTFMODE = 2;
435
436 if (!Flag(FAS_BUILTIN)) {
437 argi = parse_args(argv, OF_CMDLINE, NULL);
438 if (argi < 0)
439 return (1);
440 }
441
442 /* process this later only, default to off (hysterical raisins) */
443 utf_flag = UTFMODE;
444 UTFMODE = 0;
445
446 if (Flag(FAS_BUILTIN)) {
447 /* auto-detect from environment variables, always */
448 utf_flag = 3;
449 } else if (Flag(FCOMMAND)) {
450 s = pushs(SSTRINGCMDLINE, ATEMP);
451 if (!(s->start = s->str = argv[argi++]))
452 errorf(Tf_optfoo, "", "", 'c', Treq_arg);
453 while (*s->str) {
454 if (*s->str != ' ' && ctype(*s->str, C_QUOTE))
455 break;
456 s->str++;
457 }
458 if (!*s->str)
459 s->flags |= SF_MAYEXEC;
460 s->str = s->start;
461 #ifdef MKSH_MIDNIGHTBSD01ASH_COMPAT
462 /* compatibility to MidnightBSD 0.1 /bin/sh (kludge) */
463 if (Flag(FSH) && argv[argi] && !strcmp(argv[argi], "--"))
464 ++argi;
465 #endif
466 if (argv[argi])
467 kshname = argv[argi++];
468 } else if (argi < argc && !Flag(FSTDIN)) {
469 s = pushs(SFILE, ATEMP);
470 #ifdef __OS2__
471 /*
472 * A bug in OS/2 extproc (like shebang) handling makes
473 * it not pass the full pathname of a script, so we need
474 * to search for it. This changes the behaviour of a
475 * simple "mksh foo", but can't be helped.
476 */
477 s->file = search_path(argv[argi++], path, X_OK, NULL);
478 if (!s->file || !*s->file)
479 s->file = argv[argi - 1];
480 #else
481 s->file = argv[argi++];
482 #endif
483 s->u.shf = shf_open(s->file, O_RDONLY, 0,
484 SHF_MAPHI | SHF_CLEXEC);
485 if (s->u.shf == NULL) {
486 shl_stdout_ok = false;
487 warningf(true, Tf_sD_s, s->file, cstrerror(errno));
488 /* mandated by SUSv4 */
489 exstat = 127;
490 unwind(LERROR);
491 }
492 kshname = s->file;
493 } else {
494 Flag(FSTDIN) = 1;
495 s = pushs(SSTDIN, ATEMP);
496 s->file = "<stdin>";
497 s->u.shf = shf_fdopen(0, SHF_RD | can_seek(0),
498 NULL);
499 if (isatty(0) && isatty(2)) {
500 Flag(FTALKING) = Flag(FTALKING_I) = 1;
501 /* The following only if isatty(0) */
502 s->flags |= SF_TTY;
503 s->u.shf->flags |= SHF_INTERRUPT;
504 s->file = NULL;
505 }
506 }
507
508 /* this bizarreness is mandated by POSIX */
509 if (fstat(0, &s_stdin) >= 0 && S_ISCHR(s_stdin.st_mode) &&
510 Flag(FTALKING))
511 reset_nonblock(0);
512
513 /* initialise job control */
514 j_init();
515 /* do this after j_init() which calls tty_init_state() */
516 if (Flag(FTALKING)) {
517 if (utf_flag == 2) {
518 #ifndef MKSH_ASSUME_UTF8
519 /* auto-detect from locale or environment */
520 utf_flag = 4;
521 #else /* this may not be an #elif */
522 #if MKSH_ASSUME_UTF8
523 utf_flag = 1;
524 #else
525 /* always disable UTF-8 (for interactive) */
526 utf_flag = 0;
527 #endif
528 #endif
529 }
530 #ifndef MKSH_NO_CMDLINE_EDITING
531 x_init();
532 #endif
533 }
534
535 #ifdef SIGWINCH
536 sigtraps[SIGWINCH].flags |= TF_SHELL_USES;
537 setsig(&sigtraps[SIGWINCH], x_sigwinch,
538 SS_RESTORE_ORIG|SS_FORCE|SS_SHTRAP);
539 #endif
540
541 l = e->loc;
542 if (Flag(FAS_BUILTIN)) {
543 l->argc = argc;
544 l->argv = argv;
545 l->argv[0] = ccp;
546 } else {
547 l->argc = argc - argi;
548 /*
549 * allocate a new array because otherwise, when we modify
550 * it in-place, ps(1) output changes; the meaning of argc
551 * here is slightly different as it excludes kshname, and
552 * we add a trailing NULL sentinel as well
553 */
554 l->argv = alloc2(l->argc + 2, sizeof(void *), APERM);
555 l->argv[0] = kshname;
556 memcpy(&l->argv[1], &argv[argi], l->argc * sizeof(void *));
557 l->argv[l->argc + 1] = NULL;
558 getopts_reset(1);
559 }
560
561 /* divine the initial state of the utf8-mode Flag */
562 ccp = null;
563 switch (utf_flag) {
564
565 /* auto-detect from locale or environment */
566 case 4:
567 #if HAVE_SETLOCALE_CTYPE
568 ccp = setlocale(LC_CTYPE, "");
569 #if HAVE_LANGINFO_CODESET
570 if (!isuc(ccp))
571 ccp = nl_langinfo(CODESET);
572 #endif
573 if (!isuc(ccp))
574 ccp = null;
575 #endif
576 /* FALLTHROUGH */
577
578 /* auto-detect from environment */
579 case 3:
580 /* these were imported from environ earlier */
581 if (ccp == null)
582 ccp = str_val(global("LC_ALL"));
583 if (ccp == null)
584 ccp = str_val(global("LC_CTYPE"));
585 if (ccp == null)
586 ccp = str_val(global("LANG"));
587 UTFMODE = isuc(ccp);
588 break;
589
590 /* not set on command line, not FTALKING */
591 case 2:
592 /* unknown values */
593 default:
594 utf_flag = 0;
595 /* FALLTHROUGH */
596
597 /* known values */
598 case 1:
599 case 0:
600 UTFMODE = utf_flag;
601 break;
602 }
603
604 /* Disable during .profile/ENV reading */
605 restricted_shell = Flag(FRESTRICTED);
606 Flag(FRESTRICTED) = 0;
607 errexit = Flag(FERREXIT);
608 Flag(FERREXIT) = 0;
609
610 /*
611 * Do this before profile/$ENV so that if it causes problems in them,
612 * user will know why things broke.
613 */
614 if (!current_wd[0] && Flag(FTALKING))
615 warningf(false, "can't determine current directory");
616
617 if (Flag(FLOGIN))
618 include(MKSH_SYSTEM_PROFILE, 0, NULL, true);
619 if (!Flag(FPRIVILEGED)) {
620 if (Flag(FLOGIN))
621 include(substitute("$HOME/.profile", 0), 0, NULL, true);
622 if (Flag(FTALKING)) {
623 cp = substitute(substitute("${ENV:-" MKSHRC_PATH "}",
624 0), DOTILDE);
625 if (cp[0] != '\0')
626 include(cp, 0, NULL, true);
627 }
628 } else {
629 include(MKSH_SUID_PROFILE, 0, NULL, true);
630 /* turn off -p if not set explicitly */
631 if (Flag(FPRIVILEGED) != 1)
632 change_flag(FPRIVILEGED, OF_INTERNAL, false);
633 }
634
635 if (restricted_shell) {
636 shcomexec(restr_com);
637 /* After typeset command... */
638 Flag(FRESTRICTED) = 1;
639 }
640 Flag(FERREXIT) = errexit;
641
642 if (Flag(FTALKING) && s)
643 hist_init(s);
644 else
645 /* set after ENV */
646 Flag(FTRACKALL) = 1;
647
648 alarm_init();
649
650 *sp = s;
651 *lp = l;
652 return (0);
653 }
654
655 /* this indirection barrier reduces stack usage during normal operation */
656
657 int
main(int argc,const char * argv[])658 main(int argc, const char *argv[])
659 {
660 int rv;
661 Source *s;
662 struct block *l;
663
664 if ((rv = main_init(argc, argv, &s, &l)) == 0) {
665 if (Flag(FAS_BUILTIN)) {
666 rv = shcomexec(l->argv);
667 } else {
668 shell(s, true);
669 /* NOTREACHED */
670 }
671 }
672 return (rv);
673 }
674
675 int
include(const char * name,int argc,const char ** argv,bool intr_ok)676 include(const char *name, int argc, const char **argv, bool intr_ok)
677 {
678 Source *volatile s = NULL;
679 struct shf *shf;
680 const char **volatile old_argv;
681 volatile int old_argc;
682 int i;
683
684 shf = shf_open(name, O_RDONLY, 0, SHF_MAPHI | SHF_CLEXEC);
685 if (shf == NULL)
686 return (-1);
687
688 if (argv) {
689 old_argv = e->loc->argv;
690 old_argc = e->loc->argc;
691 } else {
692 old_argv = NULL;
693 old_argc = 0;
694 }
695 newenv(E_INCL);
696 if ((i = kshsetjmp(e->jbuf))) {
697 quitenv(s ? s->u.shf : NULL);
698 if (old_argv) {
699 e->loc->argv = old_argv;
700 e->loc->argc = old_argc;
701 }
702 switch (i) {
703 case LRETURN:
704 case LERROR:
705 /* see below */
706 return (exstat & 0xFF);
707 case LINTR:
708 /*
709 * intr_ok is set if we are including .profile or $ENV.
710 * If user ^Cs out, we don't want to kill the shell...
711 */
712 if (intr_ok && ((exstat & 0xFF) - 128) != SIGTERM)
713 return (1);
714 /* FALLTHROUGH */
715 case LEXIT:
716 case LLEAVE:
717 case LSHELL:
718 unwind(i);
719 /* NOTREACHED */
720 default:
721 internal_errorf("include %d", i);
722 /* NOTREACHED */
723 }
724 }
725 if (argv) {
726 e->loc->argv = argv;
727 e->loc->argc = argc;
728 }
729 s = pushs(SFILE, ATEMP);
730 s->u.shf = shf;
731 strdupx(s->file, name, ATEMP);
732 i = shell(s, false);
733 quitenv(s->u.shf);
734 if (old_argv) {
735 e->loc->argv = old_argv;
736 e->loc->argc = old_argc;
737 }
738 /* & 0xff to ensure value not -1 */
739 return (i & 0xFF);
740 }
741
742 /* spawn a command into a shell optionally keeping track of the line number */
743 int
command(const char * comm,int line)744 command(const char *comm, int line)
745 {
746 Source *s, *sold = source;
747 int rv;
748
749 s = pushs(SSTRING, ATEMP);
750 s->start = s->str = comm;
751 s->line = line;
752 rv = shell(s, false);
753 source = sold;
754 return (rv);
755 }
756
757 /*
758 * run the commands from the input source, returning status.
759 */
760 int
shell(Source * volatile s,volatile bool toplevel)761 shell(Source * volatile s, volatile bool toplevel)
762 {
763 struct op *t;
764 volatile bool wastty = tobool(s->flags & SF_TTY);
765 volatile uint8_t attempts = 13;
766 volatile bool interactive = Flag(FTALKING) && toplevel;
767 volatile bool sfirst = true;
768 Source *volatile old_source = source;
769 int i;
770
771 newenv(E_PARSE);
772 if (interactive)
773 really_exit = false;
774 switch ((i = kshsetjmp(e->jbuf))) {
775 case 0:
776 break;
777 case LINTR:
778 /* we get here if SIGINT not caught or ignored */
779 case LERROR:
780 case LSHELL:
781 if (interactive) {
782 if (i == LINTR)
783 shellf("\n");
784 /*
785 * Reset any eof that was read as part of a
786 * multiline command.
787 */
788 if (Flag(FIGNOREEOF) && s->type == SEOF && wastty)
789 s->type = SSTDIN;
790 /*
791 * Used by exit command to get back to
792 * top level shell. Kind of strange since
793 * interactive is set if we are reading from
794 * a tty, but to have stopped jobs, one only
795 * needs FMONITOR set (not FTALKING/SF_TTY)...
796 */
797 /* toss any input we have so far */
798 yyrecursive_pop(true);
799 s->start = s->str = null;
800 retrace_info = NULL;
801 herep = heres;
802 break;
803 }
804 /* FALLTHROUGH */
805 case LEXIT:
806 case LLEAVE:
807 case LRETURN:
808 source = old_source;
809 quitenv(NULL);
810 /* keep on going */
811 unwind(i);
812 /* NOTREACHED */
813 default:
814 source = old_source;
815 quitenv(NULL);
816 internal_errorf("shell %d", i);
817 /* NOTREACHED */
818 }
819 while (/* CONSTCOND */ 1) {
820 if (trap)
821 runtraps(0);
822
823 if (s->next == NULL) {
824 if (Flag(FVERBOSE))
825 s->flags |= SF_ECHO;
826 else
827 s->flags &= ~SF_ECHO;
828 }
829 if (interactive) {
830 j_notify();
831 set_prompt(PS1, s);
832 }
833 t = compile(s, sfirst);
834 if (interactive)
835 histsave(&s->line, NULL, HIST_FLUSH, true);
836 sfirst = false;
837 if (!t)
838 goto source_no_tree;
839 if (t->type == TEOF) {
840 if (wastty && Flag(FIGNOREEOF) && --attempts > 0) {
841 shellf("Use 'exit' to leave mksh\n");
842 s->type = SSTDIN;
843 } else if (wastty && !really_exit &&
844 j_stopped_running()) {
845 really_exit = true;
846 s->type = SSTDIN;
847 } else {
848 /*
849 * this for POSIX which says EXIT traps
850 * shall be taken in the environment
851 * immediately after the last command
852 * executed.
853 */
854 if (toplevel)
855 unwind(LEXIT);
856 break;
857 }
858 } else if ((s->flags & SF_MAYEXEC) && t->type == TCOM)
859 t->u.evalflags |= DOTCOMEXEC;
860 if (!Flag(FNOEXEC) || (s->flags & SF_TTY))
861 exstat = execute(t, 0, NULL) & 0xFF;
862
863 if (t->type != TEOF && interactive && really_exit)
864 really_exit = false;
865
866 source_no_tree:
867 reclaim();
868 }
869 quitenv(NULL);
870 source = old_source;
871 return (exstat & 0xFF);
872 }
873
874 /* return to closest error handler or shell(), exit if none found */
875 /* note: i MUST NOT be 0 */
876 void
unwind(int i)877 unwind(int i)
878 {
879 /*
880 * This is a kludge. We need to restore everything that was
881 * changed in the new environment, see cid 1005090337C7A669439
882 * and 10050903386452ACBF1, but fail to even save things most of
883 * the time. funcs.c:c_eval() changes FERREXIT temporarily to 0,
884 * which needs to be restored thus (related to Debian #696823).
885 * We did not save the shell flags, so we use a special or'd
886 * value here... this is mostly to clean up behind *other*
887 * callers of unwind(LERROR) here; exec.c has the regular case.
888 */
889 if (Flag(FERREXIT) & 0x80) {
890 /* GNU bash does not run this trapsig */
891 trapsig(ksh_SIGERR);
892 Flag(FERREXIT) &= ~0x80;
893 }
894
895 /* ordering for EXIT vs ERR is a bit odd (this is what AT&T ksh does) */
896 if (i == LEXIT || ((i == LERROR || i == LINTR) &&
897 sigtraps[ksh_SIGEXIT].trap &&
898 (!Flag(FTALKING) || Flag(FERREXIT)))) {
899 ++trap_nested;
900 runtrap(&sigtraps[ksh_SIGEXIT], trap_nested == 1);
901 --trap_nested;
902 i = LLEAVE;
903 } else if (Flag(FERREXIT) == 1 && (i == LERROR || i == LINTR)) {
904 ++trap_nested;
905 runtrap(&sigtraps[ksh_SIGERR], trap_nested == 1);
906 --trap_nested;
907 i = LLEAVE;
908 }
909
910 while (/* CONSTCOND */ 1) {
911 switch (e->type) {
912 case E_PARSE:
913 case E_FUNC:
914 case E_INCL:
915 case E_LOOP:
916 case E_ERRH:
917 kshlongjmp(e->jbuf, i);
918 /* NOTREACHED */
919 case E_NONE:
920 if (i == LINTR)
921 e->flags |= EF_FAKE_SIGDIE;
922 /* FALLTHROUGH */
923 default:
924 quitenv(NULL);
925 }
926 }
927 }
928
929 void
newenv(int type)930 newenv(int type)
931 {
932 struct env *ep;
933 char *cp;
934
935 /*
936 * struct env includes ALLOC_ITEM for alignment constraints
937 * so first get the actually used memory, then assign it
938 */
939 cp = alloc(sizeof(struct env) - sizeof(ALLOC_ITEM), ATEMP);
940 /* undo what alloc() did to the malloc result address */
941 ep = (void *)(cp - sizeof(ALLOC_ITEM));
942 /* initialise public members of struct env (not the ALLOC_ITEM) */
943 ainit(&ep->area);
944 ep->oenv = e;
945 ep->loc = e->loc;
946 ep->savefd = NULL;
947 ep->temps = NULL;
948 ep->yyrecursive_statep = NULL;
949 ep->type = type;
950 ep->flags = 0;
951 /* jump buffer is invalid because flags == 0 */
952 e = ep;
953 }
954
955 void
quitenv(struct shf * shf)956 quitenv(struct shf *shf)
957 {
958 struct env *ep = e;
959 char *cp;
960 int fd;
961
962 yyrecursive_pop(true);
963 while (ep->oenv && ep->oenv->loc != ep->loc)
964 popblock();
965 if (ep->savefd != NULL) {
966 for (fd = 0; fd < NUFILE; fd++)
967 /* if ep->savefd[fd] < 0, means fd was closed */
968 if (ep->savefd[fd])
969 restfd(fd, ep->savefd[fd]);
970 if (ep->savefd[2])
971 /* Clear any write errors */
972 shf_reopen(2, SHF_WR, shl_out);
973 }
974 /*
975 * Bottom of the stack.
976 * Either main shell is exiting or cleanup_parents_env() was called.
977 */
978 if (ep->oenv == NULL) {
979 #ifdef DEBUG_LEAKS
980 int i;
981 #endif
982
983 if (ep->type == E_NONE) {
984 /* Main shell exiting? */
985 #if HAVE_PERSISTENT_HISTORY
986 if (Flag(FTALKING))
987 hist_finish();
988 #endif
989 j_exit();
990 if (ep->flags & EF_FAKE_SIGDIE) {
991 int sig = (exstat & 0xFF) - 128;
992
993 /*
994 * ham up our death a bit (AT&T ksh
995 * only seems to do this for SIGTERM)
996 * Don't do it for SIGQUIT, since we'd
997 * dump a core..
998 */
999 if ((sig == SIGINT || sig == SIGTERM) &&
1000 (kshpgrp == kshpid)) {
1001 setsig(&sigtraps[sig], SIG_DFL,
1002 SS_RESTORE_CURR | SS_FORCE);
1003 kill(0, sig);
1004 }
1005 }
1006 }
1007 if (shf)
1008 shf_close(shf);
1009 reclaim();
1010 #ifdef DEBUG_LEAKS
1011 #ifndef MKSH_NO_CMDLINE_EDITING
1012 x_done();
1013 #endif
1014 #ifndef MKSH_NOPROSPECTOFWORK
1015 /* block at least SIGCHLD during/after afreeall */
1016 sigprocmask(SIG_BLOCK, &sm_sigchld, NULL);
1017 #endif
1018 afreeall(APERM);
1019 for (fd = 3; fd < NUFILE; fd++)
1020 if ((i = fcntl(fd, F_GETFD, 0)) != -1 &&
1021 (i & FD_CLOEXEC))
1022 close(fd);
1023 close(2);
1024 close(1);
1025 close(0);
1026 #endif
1027 exit(exstat & 0xFF);
1028 }
1029 if (shf)
1030 shf_close(shf);
1031 reclaim();
1032
1033 e = e->oenv;
1034
1035 /* free the struct env - tricky due to the ALLOC_ITEM inside */
1036 cp = (void *)ep;
1037 afree(cp + sizeof(ALLOC_ITEM), ATEMP);
1038 }
1039
1040 /* Called after a fork to cleanup stuff left over from parents environment */
1041 void
cleanup_parents_env(void)1042 cleanup_parents_env(void)
1043 {
1044 struct env *ep;
1045 int fd;
1046
1047 /*
1048 * Don't clean up temporary files - parent will probably need them.
1049 * Also, can't easily reclaim memory since variables, etc. could be
1050 * anywhere.
1051 */
1052
1053 /* close all file descriptors hiding in savefd */
1054 for (ep = e; ep; ep = ep->oenv) {
1055 if (ep->savefd) {
1056 for (fd = 0; fd < NUFILE; fd++)
1057 if (ep->savefd[fd] > 0)
1058 close(ep->savefd[fd]);
1059 afree(ep->savefd, &ep->area);
1060 ep->savefd = NULL;
1061 }
1062 #ifdef DEBUG_LEAKS
1063 if (ep->type != E_NONE)
1064 ep->type = E_GONE;
1065 #endif
1066 }
1067 #ifndef DEBUG_LEAKS
1068 e->oenv = NULL;
1069 #endif
1070 }
1071
1072 /* Called just before an execve cleanup stuff temporary files */
1073 void
cleanup_proc_env(void)1074 cleanup_proc_env(void)
1075 {
1076 struct env *ep;
1077
1078 for (ep = e; ep; ep = ep->oenv)
1079 remove_temps(ep->temps);
1080 }
1081
1082 /* remove temp files and free ATEMP Area */
1083 static void
reclaim(void)1084 reclaim(void)
1085 {
1086 struct block *l;
1087
1088 while ((l = e->loc) && (!e->oenv || e->oenv->loc != l)) {
1089 e->loc = l->next;
1090 afreeall(&l->area);
1091 }
1092
1093 remove_temps(e->temps);
1094 e->temps = NULL;
1095
1096 /*
1097 * if the memory backing source is reclaimed, things
1098 * will end up badly when a function expecting it to
1099 * be valid is run; a NULL pointer is easily debugged
1100 */
1101 if (source && source->areap == &e->area)
1102 source = NULL;
1103 afreeall(&e->area);
1104 }
1105
1106 static void
remove_temps(struct temp * tp)1107 remove_temps(struct temp *tp)
1108 {
1109 while (tp) {
1110 if (tp->pid == procpid)
1111 unlink(tp->tffn);
1112 tp = tp->next;
1113 }
1114 }
1115
1116 /*
1117 * Initialise tty_fd. Used for tracking the size of the terminal,
1118 * saving/resetting tty modes upon forground job completion, and
1119 * for setting up the tty process group. Return values:
1120 * 0 = got controlling tty
1121 * 1 = got terminal but no controlling tty
1122 * 2 = cannot find a terminal
1123 * 3 = cannot dup fd
1124 * 4 = cannot make fd close-on-exec
1125 * An existing tty_fd is cached if no "better" one could be found,
1126 * i.e. if tty_devtty was already set or the new would not set it.
1127 */
1128 int
tty_init_fd(void)1129 tty_init_fd(void)
1130 {
1131 int fd, rv, eno = 0;
1132 bool do_close = false, is_devtty = true;
1133
1134 if (tty_devtty) {
1135 /* already got a tty which is /dev/tty */
1136 return (0);
1137 }
1138
1139 #ifdef _UWIN
1140 /*XXX imake style */
1141 if (isatty(3)) {
1142 /* fd 3 on UWIN _is_ /dev/tty (or our controlling tty) */
1143 fd = 3;
1144 goto got_fd;
1145 }
1146 #endif
1147 if ((fd = open(T_devtty, O_RDWR, 0)) >= 0) {
1148 do_close = true;
1149 goto got_fd;
1150 }
1151 eno = errno;
1152
1153 if (tty_fd >= 0) {
1154 /* already got a non-devtty one */
1155 rv = 1;
1156 goto out;
1157 }
1158 is_devtty = false;
1159
1160 if (isatty((fd = 0)) || isatty((fd = 2)))
1161 goto got_fd;
1162 /* cannot find one */
1163 rv = 2;
1164 /* assert: do_close == false */
1165 goto out;
1166
1167 got_fd:
1168 if ((rv = fcntl(fd, F_DUPFD, FDBASE)) < 0) {
1169 eno = errno;
1170 rv = 3;
1171 goto out;
1172 }
1173 if (fcntl(rv, F_SETFD, FD_CLOEXEC) < 0) {
1174 eno = errno;
1175 close(rv);
1176 rv = 4;
1177 goto out;
1178 }
1179 tty_fd = rv;
1180 tty_devtty = is_devtty;
1181 rv = eno = 0;
1182 out:
1183 if (do_close)
1184 close(fd);
1185 errno = eno;
1186 return (rv);
1187 }
1188
1189 /* A shell error occurred (eg, syntax error, etc.) */
1190
1191 #define VWARNINGF_ERRORPREFIX 1
1192 #define VWARNINGF_FILELINE 2
1193 #define VWARNINGF_BUILTIN 4
1194 #define VWARNINGF_INTERNAL 8
1195
1196 static void vwarningf(unsigned int, const char *, va_list)
1197 MKSH_A_FORMAT(__printf__, 2, 0);
1198
1199 static void
vwarningf(unsigned int flags,const char * fmt,va_list ap)1200 vwarningf(unsigned int flags, const char *fmt, va_list ap)
1201 {
1202 if (fmt) {
1203 if (flags & VWARNINGF_INTERNAL)
1204 shf_fprintf(shl_out, Tf_sD_, "internal error");
1205 if (flags & VWARNINGF_ERRORPREFIX)
1206 error_prefix(tobool(flags & VWARNINGF_FILELINE));
1207 if ((flags & VWARNINGF_BUILTIN) &&
1208 /* not set when main() calls parse_args() */
1209 builtin_argv0 && builtin_argv0 != kshname)
1210 shf_fprintf(shl_out, Tf_sD_, builtin_argv0);
1211 shf_vfprintf(shl_out, fmt, ap);
1212 shf_putchar('\n', shl_out);
1213 }
1214 shf_flush(shl_out);
1215 }
1216
1217 void
errorfx(int rc,const char * fmt,...)1218 errorfx(int rc, const char *fmt, ...)
1219 {
1220 va_list va;
1221
1222 exstat = rc;
1223
1224 /* debugging: note that stdout not valid */
1225 shl_stdout_ok = false;
1226
1227 va_start(va, fmt);
1228 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va);
1229 va_end(va);
1230 unwind(LERROR);
1231 }
1232
1233 void
errorf(const char * fmt,...)1234 errorf(const char *fmt, ...)
1235 {
1236 va_list va;
1237
1238 exstat = 1;
1239
1240 /* debugging: note that stdout not valid */
1241 shl_stdout_ok = false;
1242
1243 va_start(va, fmt);
1244 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va);
1245 va_end(va);
1246 unwind(LERROR);
1247 }
1248
1249 /* like errorf(), but no unwind is done */
1250 void
warningf(bool fileline,const char * fmt,...)1251 warningf(bool fileline, const char *fmt, ...)
1252 {
1253 va_list va;
1254
1255 va_start(va, fmt);
1256 vwarningf(VWARNINGF_ERRORPREFIX | (fileline ? VWARNINGF_FILELINE : 0),
1257 fmt, va);
1258 va_end(va);
1259 }
1260
1261 /*
1262 * Used by built-in utilities to prefix shell and utility name to message
1263 * (also unwinds environments for special builtins).
1264 */
1265 void
bi_errorf(const char * fmt,...)1266 bi_errorf(const char *fmt, ...)
1267 {
1268 va_list va;
1269
1270 /* debugging: note that stdout not valid */
1271 shl_stdout_ok = false;
1272
1273 exstat = 1;
1274
1275 va_start(va, fmt);
1276 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE |
1277 VWARNINGF_BUILTIN, fmt, va);
1278 va_end(va);
1279
1280 /*
1281 * POSIX special builtins and ksh special builtins cause
1282 * non-interactive shells to exit. XXX may not want LERROR here
1283 */
1284 if (builtin_spec) {
1285 builtin_argv0 = NULL;
1286 unwind(LERROR);
1287 }
1288 }
1289
1290 /* Called when something that shouldn't happen does */
1291 void
internal_errorf(const char * fmt,...)1292 internal_errorf(const char *fmt, ...)
1293 {
1294 va_list va;
1295
1296 va_start(va, fmt);
1297 vwarningf(VWARNINGF_INTERNAL, fmt, va);
1298 va_end(va);
1299 unwind(LERROR);
1300 }
1301
1302 void
internal_warningf(const char * fmt,...)1303 internal_warningf(const char *fmt, ...)
1304 {
1305 va_list va;
1306
1307 va_start(va, fmt);
1308 vwarningf(VWARNINGF_INTERNAL, fmt, va);
1309 va_end(va);
1310 }
1311
1312 /* used by error reporting functions to print "ksh: .kshrc[25]: " */
1313 void
error_prefix(bool fileline)1314 error_prefix(bool fileline)
1315 {
1316 /* Avoid foo: foo[2]: ... */
1317 if (!fileline || !source || !source->file ||
1318 strcmp(source->file, kshname) != 0)
1319 shf_fprintf(shl_out, Tf_sD_, kshname + (*kshname == '-'));
1320 if (fileline && source && source->file != NULL) {
1321 shf_fprintf(shl_out, "%s[%lu]: ", source->file,
1322 (unsigned long)(source->errline ?
1323 source->errline : source->line));
1324 source->errline = 0;
1325 }
1326 }
1327
1328 /* printf to shl_out (stderr) with flush */
1329 void
shellf(const char * fmt,...)1330 shellf(const char *fmt, ...)
1331 {
1332 va_list va;
1333
1334 if (!initio_done)
1335 /* shl_out may not be set up yet... */
1336 return;
1337 va_start(va, fmt);
1338 shf_vfprintf(shl_out, fmt, va);
1339 va_end(va);
1340 shf_flush(shl_out);
1341 }
1342
1343 /* printf to shl_stdout (stdout) */
1344 void
shprintf(const char * fmt,...)1345 shprintf(const char *fmt, ...)
1346 {
1347 va_list va;
1348
1349 if (!shl_stdout_ok)
1350 internal_errorf("shl_stdout not valid");
1351 va_start(va, fmt);
1352 shf_vfprintf(shl_stdout, fmt, va);
1353 va_end(va);
1354 }
1355
1356 /* test if we can seek backwards fd (returns 0 or SHF_UNBUF) */
1357 int
can_seek(int fd)1358 can_seek(int fd)
1359 {
1360 struct stat statb;
1361
1362 return (fstat(fd, &statb) == 0 && !S_ISREG(statb.st_mode) ?
1363 SHF_UNBUF : 0);
1364 }
1365
1366 #ifdef DF
1367 int shl_dbg_fd;
1368 #define NSHF_IOB 4
1369 #else
1370 #define NSHF_IOB 3
1371 #endif
1372 struct shf shf_iob[NSHF_IOB];
1373
1374 void
initio(void)1375 initio(void)
1376 {
1377 #ifdef DF
1378 const char *lfp;
1379 #endif
1380
1381 /* force buffer allocation */
1382 shf_fdopen(1, SHF_WR, shl_stdout);
1383 shf_fdopen(2, SHF_WR, shl_out);
1384 shf_fdopen(2, SHF_WR, shl_xtrace);
1385 #ifdef DF
1386 if ((lfp = getenv("SDMKSH_PATH")) == NULL) {
1387 if ((lfp = getenv("HOME")) == NULL || !mksh_abspath(lfp))
1388 errorf("cannot get home directory");
1389 lfp = shf_smprintf(Tf_sSs, lfp, "mksh-dbg.txt");
1390 }
1391
1392 if ((shl_dbg_fd = open(lfp, O_WRONLY | O_APPEND | O_CREAT, 0600)) < 0)
1393 errorf("cannot open debug output file %s", lfp);
1394 if (shl_dbg_fd < FDBASE) {
1395 int nfd;
1396
1397 nfd = fcntl(shl_dbg_fd, F_DUPFD, FDBASE);
1398 close(shl_dbg_fd);
1399 if ((shl_dbg_fd = nfd) == -1)
1400 errorf("cannot dup debug output file");
1401 }
1402 fcntl(shl_dbg_fd, F_SETFD, FD_CLOEXEC);
1403 shf_fdopen(shl_dbg_fd, SHF_WR, shl_dbg);
1404 DF("=== open ===");
1405 #endif
1406 initio_done = true;
1407 }
1408
1409 /* A dup2() with error checking */
1410 int
ksh_dup2(int ofd,int nfd,bool errok)1411 ksh_dup2(int ofd, int nfd, bool errok)
1412 {
1413 int rv;
1414
1415 if (((rv = dup2(ofd, nfd)) < 0) && !errok && (errno != EBADF))
1416 errorf("too many files open in shell");
1417
1418 #ifdef __ultrix
1419 /*XXX imake style */
1420 if (rv >= 0)
1421 fcntl(nfd, F_SETFD, 0);
1422 #endif
1423
1424 return (rv);
1425 }
1426
1427 /*
1428 * Move fd from user space (0 <= fd < 10) to shell space (fd >= 10),
1429 * set close-on-exec flag. See FDBASE in sh.h, maybe 24 not 10 here.
1430 */
1431 short
savefd(int fd)1432 savefd(int fd)
1433 {
1434 int nfd = fd;
1435
1436 if (fd < FDBASE && (nfd = fcntl(fd, F_DUPFD, FDBASE)) < 0 &&
1437 (errno == EBADF || errno == EPERM))
1438 return (-1);
1439 if (nfd < 0 || nfd > SHRT_MAX)
1440 errorf("too many files open in shell");
1441 fcntl(nfd, F_SETFD, FD_CLOEXEC);
1442 return ((short)nfd);
1443 }
1444
1445 void
restfd(int fd,int ofd)1446 restfd(int fd, int ofd)
1447 {
1448 if (fd == 2)
1449 shf_flush(&shf_iob[/* fd */ 2]);
1450 if (ofd < 0)
1451 /* original fd closed */
1452 close(fd);
1453 else if (fd != ofd) {
1454 /*XXX: what to do if this dup fails? */
1455 ksh_dup2(ofd, fd, true);
1456 close(ofd);
1457 }
1458 }
1459
1460 void
openpipe(int * pv)1461 openpipe(int *pv)
1462 {
1463 int lpv[2];
1464
1465 if (pipe(lpv) < 0)
1466 errorf("can't create pipe - try again");
1467 pv[0] = savefd(lpv[0]);
1468 if (pv[0] != lpv[0])
1469 close(lpv[0]);
1470 pv[1] = savefd(lpv[1]);
1471 if (pv[1] != lpv[1])
1472 close(lpv[1]);
1473 }
1474
1475 void
closepipe(int * pv)1476 closepipe(int *pv)
1477 {
1478 close(pv[0]);
1479 close(pv[1]);
1480 }
1481
1482 /*
1483 * Called by iosetup() (deals with 2>&4, etc.), c_read, c_print to turn
1484 * a string (the X in 2>&X, read -uX, print -uX) into a file descriptor.
1485 */
1486 int
check_fd(const char * name,int mode,const char ** emsgp)1487 check_fd(const char *name, int mode, const char **emsgp)
1488 {
1489 int fd, fl;
1490
1491 if (!name[0] || name[1])
1492 goto illegal_fd_name;
1493 if (name[0] == 'p')
1494 return (coproc_getfd(mode, emsgp));
1495 if (!ksh_isdigit(name[0])) {
1496 illegal_fd_name:
1497 if (emsgp)
1498 *emsgp = "illegal file descriptor name";
1499 return (-1);
1500 }
1501
1502 if ((fl = fcntl((fd = ksh_numdig(name[0])), F_GETFL, 0)) < 0) {
1503 if (emsgp)
1504 *emsgp = "bad file descriptor";
1505 return (-1);
1506 }
1507 fl &= O_ACCMODE;
1508 /*
1509 * X_OK is a kludge to disable this check for dups (x<&1):
1510 * historical shells never did this check (XXX don't know what
1511 * POSIX has to say).
1512 */
1513 if (!(mode & X_OK) && fl != O_RDWR && (
1514 ((mode & R_OK) && fl != O_RDONLY) ||
1515 ((mode & W_OK) && fl != O_WRONLY))) {
1516 if (emsgp)
1517 *emsgp = (fl == O_WRONLY) ?
1518 "fd not open for reading" :
1519 "fd not open for writing";
1520 return (-1);
1521 }
1522 return (fd);
1523 }
1524
1525 /* Called once from main */
1526 void
coproc_init(void)1527 coproc_init(void)
1528 {
1529 coproc.read = coproc.readw = coproc.write = -1;
1530 coproc.njobs = 0;
1531 coproc.id = 0;
1532 }
1533
1534 /* Called by c_read() when eof is read - close fd if it is the co-process fd */
1535 void
coproc_read_close(int fd)1536 coproc_read_close(int fd)
1537 {
1538 if (coproc.read >= 0 && fd == coproc.read) {
1539 coproc_readw_close(fd);
1540 close(coproc.read);
1541 coproc.read = -1;
1542 }
1543 }
1544
1545 /*
1546 * Called by c_read() and by iosetup() to close the other side of the
1547 * read pipe, so reads will actually terminate.
1548 */
1549 void
coproc_readw_close(int fd)1550 coproc_readw_close(int fd)
1551 {
1552 if (coproc.readw >= 0 && coproc.read >= 0 && fd == coproc.read) {
1553 close(coproc.readw);
1554 coproc.readw = -1;
1555 }
1556 }
1557
1558 /*
1559 * Called by c_print when a write to a fd fails with EPIPE and by iosetup
1560 * when co-process input is dup'd
1561 */
1562 void
coproc_write_close(int fd)1563 coproc_write_close(int fd)
1564 {
1565 if (coproc.write >= 0 && fd == coproc.write) {
1566 close(coproc.write);
1567 coproc.write = -1;
1568 }
1569 }
1570
1571 /*
1572 * Called to check for existence of/value of the co-process file descriptor.
1573 * (Used by check_fd() and by c_read/c_print to deal with -p option).
1574 */
1575 int
coproc_getfd(int mode,const char ** emsgp)1576 coproc_getfd(int mode, const char **emsgp)
1577 {
1578 int fd = (mode & R_OK) ? coproc.read : coproc.write;
1579
1580 if (fd >= 0)
1581 return (fd);
1582 if (emsgp)
1583 *emsgp = "no coprocess";
1584 return (-1);
1585 }
1586
1587 /*
1588 * called to close file descriptors related to the coprocess (if any)
1589 * Should be called with SIGCHLD blocked.
1590 */
1591 void
coproc_cleanup(int reuse)1592 coproc_cleanup(int reuse)
1593 {
1594 /* This to allow co-processes to share output pipe */
1595 if (!reuse || coproc.readw < 0 || coproc.read < 0) {
1596 if (coproc.read >= 0) {
1597 close(coproc.read);
1598 coproc.read = -1;
1599 }
1600 if (coproc.readw >= 0) {
1601 close(coproc.readw);
1602 coproc.readw = -1;
1603 }
1604 }
1605 if (coproc.write >= 0) {
1606 close(coproc.write);
1607 coproc.write = -1;
1608 }
1609 }
1610
1611 struct temp *
maketemp(Area * ap,Temp_type type,struct temp ** tlist)1612 maketemp(Area *ap, Temp_type type, struct temp **tlist)
1613 {
1614 char *cp;
1615 size_t len;
1616 int i, j;
1617 struct temp *tp;
1618 const char *dir;
1619 struct stat sb;
1620
1621 dir = tmpdir ? tmpdir : MKSH_DEFAULT_TMPDIR;
1622 /* add "/shXXXXXX.tmp" plus NUL */
1623 len = strlen(dir);
1624 checkoktoadd(len, offsetof(struct temp, tffn[0]) + 14);
1625 tp = alloc(offsetof(struct temp, tffn[0]) + 14 + len, ap);
1626
1627 tp->shf = NULL;
1628 tp->pid = procpid;
1629 tp->type = type;
1630
1631 if (stat(dir, &sb) || !S_ISDIR(sb.st_mode)) {
1632 tp->tffn[0] = '\0';
1633 goto maketemp_out;
1634 }
1635
1636 cp = (void *)tp;
1637 cp += offsetof(struct temp, tffn[0]);
1638 memcpy(cp, dir, len);
1639 cp += len;
1640 memcpy(cp, "/shXXXXXX.tmp", 14);
1641 /* point to the first of six Xes */
1642 cp += 3;
1643
1644 /* cyclically attempt to open a temporary file */
1645 do {
1646 /* generate random part of filename */
1647 len = 0;
1648 do {
1649 cp[len++] = digits_lc[rndget() % 36];
1650 } while (len < 6);
1651
1652 /* check if this one works */
1653 if ((i = binopen3(tp->tffn, O_CREAT | O_EXCL | O_RDWR,
1654 0600)) < 0 && errno != EEXIST)
1655 goto maketemp_out;
1656 } while (i < 0);
1657
1658 if (type == TT_FUNSUB) {
1659 /* map us high and mark as close-on-exec */
1660 if ((j = savefd(i)) != i) {
1661 close(i);
1662 i = j;
1663 }
1664
1665 /* operation mode for the shf */
1666 j = SHF_RD;
1667 } else
1668 j = SHF_WR;
1669
1670 /* shf_fdopen cannot fail, so no fd leak */
1671 tp->shf = shf_fdopen(i, j, NULL);
1672
1673 maketemp_out:
1674 tp->next = *tlist;
1675 *tlist = tp;
1676 return (tp);
1677 }
1678
1679 /*
1680 * We use a similar collision resolution algorithm as Python 2.5.4
1681 * but with a slightly tweaked implementation written from scratch.
1682 */
1683
1684 #define INIT_TBLSHIFT 3 /* initial table shift (2^3 = 8) */
1685 #define PERTURB_SHIFT 5 /* see Python 2.5.4 Objects/dictobject.c */
1686
1687 static void tgrow(struct table *);
1688 static int tnamecmp(const void *, const void *);
1689
1690 static void
tgrow(struct table * tp)1691 tgrow(struct table *tp)
1692 {
1693 size_t i, j, osize, mask, perturb;
1694 struct tbl *tblp, **pp;
1695 struct tbl **ntblp, **otblp = tp->tbls;
1696
1697 if (tp->tshift > 29)
1698 internal_errorf("hash table size limit reached");
1699
1700 /* calculate old size, new shift and new size */
1701 osize = (size_t)1 << (tp->tshift++);
1702 i = osize << 1;
1703
1704 ntblp = alloc2(i, sizeof(struct tbl *), tp->areap);
1705 /* multiplication cannot overflow: alloc2 checked that */
1706 memset(ntblp, 0, i * sizeof(struct tbl *));
1707
1708 /* table can get very full when reaching its size limit */
1709 tp->nfree = (tp->tshift == 30) ? 0x3FFF0000UL :
1710 /* but otherwise, only 75% */
1711 ((i * 3) / 4);
1712 tp->tbls = ntblp;
1713 if (otblp == NULL)
1714 return;
1715
1716 mask = i - 1;
1717 for (i = 0; i < osize; i++)
1718 if ((tblp = otblp[i]) != NULL) {
1719 if ((tblp->flag & DEFINED)) {
1720 /* search for free hash table slot */
1721 j = perturb = tblp->ua.hval;
1722 goto find_first_empty_slot;
1723 find_next_empty_slot:
1724 j = (j << 2) + j + perturb + 1;
1725 perturb >>= PERTURB_SHIFT;
1726 find_first_empty_slot:
1727 pp = &ntblp[j & mask];
1728 if (*pp != NULL)
1729 goto find_next_empty_slot;
1730 /* found an empty hash table slot */
1731 *pp = tblp;
1732 tp->nfree--;
1733 } else if (!(tblp->flag & FINUSE)) {
1734 afree(tblp, tp->areap);
1735 }
1736 }
1737 afree(otblp, tp->areap);
1738 }
1739
1740 void
ktinit(Area * ap,struct table * tp,uint8_t initshift)1741 ktinit(Area *ap, struct table *tp, uint8_t initshift)
1742 {
1743 tp->areap = ap;
1744 tp->tbls = NULL;
1745 tp->tshift = ((initshift > INIT_TBLSHIFT) ?
1746 initshift : INIT_TBLSHIFT) - 1;
1747 tgrow(tp);
1748 }
1749
1750 /* table, name (key) to search for, hash(name), rv pointer to tbl ptr */
1751 struct tbl *
ktscan(struct table * tp,const char * name,uint32_t h,struct tbl *** ppp)1752 ktscan(struct table *tp, const char *name, uint32_t h, struct tbl ***ppp)
1753 {
1754 size_t j, perturb, mask;
1755 struct tbl **pp, *p;
1756
1757 mask = ((size_t)1 << (tp->tshift)) - 1;
1758 /* search for hash table slot matching name */
1759 j = perturb = h;
1760 goto find_first_slot;
1761 find_next_slot:
1762 j = (j << 2) + j + perturb + 1;
1763 perturb >>= PERTURB_SHIFT;
1764 find_first_slot:
1765 pp = &tp->tbls[j & mask];
1766 if ((p = *pp) != NULL && (p->ua.hval != h || !(p->flag & DEFINED) ||
1767 strcmp(p->name, name)))
1768 goto find_next_slot;
1769 /* p == NULL if not found, correct found entry otherwise */
1770 if (ppp)
1771 *ppp = pp;
1772 return (p);
1773 }
1774
1775 /* table, name (key) to enter, hash(n) */
1776 struct tbl *
ktenter(struct table * tp,const char * n,uint32_t h)1777 ktenter(struct table *tp, const char *n, uint32_t h)
1778 {
1779 struct tbl **pp, *p;
1780 size_t len;
1781
1782 Search:
1783 if ((p = ktscan(tp, n, h, &pp)))
1784 return (p);
1785
1786 if (tp->nfree == 0) {
1787 /* too full */
1788 tgrow(tp);
1789 goto Search;
1790 }
1791
1792 /* create new tbl entry */
1793 len = strlen(n);
1794 checkoktoadd(len, offsetof(struct tbl, name[0]) + 1);
1795 p = alloc(offsetof(struct tbl, name[0]) + ++len, tp->areap);
1796 p->flag = 0;
1797 p->type = 0;
1798 p->areap = tp->areap;
1799 p->ua.hval = h;
1800 p->u2.field = 0;
1801 p->u.array = NULL;
1802 memcpy(p->name, n, len);
1803
1804 /* enter in tp->tbls */
1805 tp->nfree--;
1806 *pp = p;
1807 return (p);
1808 }
1809
1810 void
ktwalk(struct tstate * ts,struct table * tp)1811 ktwalk(struct tstate *ts, struct table *tp)
1812 {
1813 ts->left = (size_t)1 << (tp->tshift);
1814 ts->next = tp->tbls;
1815 }
1816
1817 struct tbl *
ktnext(struct tstate * ts)1818 ktnext(struct tstate *ts)
1819 {
1820 while (--ts->left >= 0) {
1821 struct tbl *p = *ts->next++;
1822 if (p != NULL && (p->flag & DEFINED))
1823 return (p);
1824 }
1825 return (NULL);
1826 }
1827
1828 static int
tnamecmp(const void * p1,const void * p2)1829 tnamecmp(const void *p1, const void *p2)
1830 {
1831 const struct tbl *a = *((const struct tbl * const *)p1);
1832 const struct tbl *b = *((const struct tbl * const *)p2);
1833
1834 return (strcmp(a->name, b->name));
1835 }
1836
1837 struct tbl **
ktsort(struct table * tp)1838 ktsort(struct table *tp)
1839 {
1840 size_t i;
1841 struct tbl **p, **sp, **dp;
1842
1843 /*
1844 * since the table is never entirely full, no need to reserve
1845 * additional space for the trailing NULL appended below
1846 */
1847 i = (size_t)1 << (tp->tshift);
1848 p = alloc2(i, sizeof(struct tbl *), ATEMP);
1849 sp = tp->tbls; /* source */
1850 dp = p; /* dest */
1851 while (i--)
1852 if ((*dp = *sp++) != NULL && (((*dp)->flag & DEFINED) ||
1853 ((*dp)->flag & ARRAY)))
1854 dp++;
1855 qsort(p, (i = dp - p), sizeof(struct tbl *), tnamecmp);
1856 p[i] = NULL;
1857 return (p);
1858 }
1859
1860 #ifdef SIGWINCH
1861 static void
x_sigwinch(int sig MKSH_A_UNUSED)1862 x_sigwinch(int sig MKSH_A_UNUSED)
1863 {
1864 /* this runs inside interrupt context, with errno saved */
1865
1866 got_winch = 1;
1867 }
1868 #endif
1869
1870 #ifdef DF
1871 void
DF(const char * fmt,...)1872 DF(const char *fmt, ...)
1873 {
1874 va_list args;
1875 struct timeval tv;
1876 mirtime_mjd mjd;
1877
1878 mksh_lockfd(shl_dbg_fd);
1879 mksh_TIME(tv);
1880 timet2mjd(&mjd, tv.tv_sec);
1881 shf_fprintf(shl_dbg, "[%02u:%02u:%02u (%u) %u.%06u] ",
1882 (unsigned)mjd.sec / 3600, ((unsigned)mjd.sec / 60) % 60,
1883 (unsigned)mjd.sec % 60, (unsigned)getpid(),
1884 (unsigned)tv.tv_sec, (unsigned)tv.tv_usec);
1885 va_start(args, fmt);
1886 shf_vfprintf(shl_dbg, fmt, args);
1887 va_end(args);
1888 shf_putc('\n', shl_dbg);
1889 shf_flush(shl_dbg);
1890 mksh_unlkfd(shl_dbg_fd);
1891 }
1892 #endif
1893
1894 void
x_mkraw(int fd,mksh_ttyst * ocb,bool forread)1895 x_mkraw(int fd, mksh_ttyst *ocb, bool forread)
1896 {
1897 mksh_ttyst cb;
1898
1899 if (ocb)
1900 mksh_tcget(fd, ocb);
1901 else
1902 ocb = &tty_state;
1903
1904 cb = *ocb;
1905 if (forread) {
1906 cb.c_iflag &= ~(ISTRIP);
1907 cb.c_lflag &= ~(ICANON) | ECHO;
1908 } else {
1909 cb.c_iflag &= ~(INLCR | ICRNL | ISTRIP);
1910 cb.c_lflag &= ~(ISIG | ICANON | ECHO);
1911 }
1912 #if defined(VLNEXT) && defined(_POSIX_VDISABLE)
1913 /* OSF/1 processes lnext when ~icanon */
1914 cb.c_cc[VLNEXT] = _POSIX_VDISABLE;
1915 #endif
1916 /* SunOS 4.1.x & OSF/1 processes discard(flush) when ~icanon */
1917 #if defined(VDISCARD) && defined(_POSIX_VDISABLE)
1918 cb.c_cc[VDISCARD] = _POSIX_VDISABLE;
1919 #endif
1920 cb.c_cc[VTIME] = 0;
1921 cb.c_cc[VMIN] = 1;
1922
1923 mksh_tcset(fd, &cb);
1924 }
1925