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Commit | Line | Data |
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cce855bc JA |
1 | /* redir.c -- Functions to perform input and output redirection. */ |
2 | ||
7117c2d2 | 3 | /* Copyright (C) 1997-2002 Free Software Foundation, Inc. |
cce855bc JA |
4 | |
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
7 | Bash is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU General Public License as published by | |
bb70624e | 9 | the Free Software Foundation; either version 2, or (at your option) |
cce855bc JA |
10 | any later version. |
11 | ||
12 | Bash is distributed in the hope that it will be useful, but WITHOUT | |
13 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
14 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public | |
15 | License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with Bash; see the file COPYING. If not, write to the Free | |
bb70624e | 19 | Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
cce855bc JA |
20 | #include "config.h" |
21 | ||
22 | #if !defined (__GNUC__) && !defined (HAVE_ALLOCA_H) && defined (_AIX) | |
23 | #pragma alloca | |
24 | #endif /* _AIX && RISC6000 && !__GNUC__ */ | |
25 | ||
26 | #include <stdio.h> | |
27 | #include "bashtypes.h" | |
b80f6443 | 28 | #if !defined (_MINIX) && defined (HAVE_SYS_FILE_H) |
cce855bc JA |
29 | # include <sys/file.h> |
30 | #endif | |
31 | #include "filecntl.h" | |
32 | #include "posixstat.h" | |
33 | ||
34 | #if defined (HAVE_UNISTD_H) | |
35 | # include <unistd.h> | |
36 | #endif | |
37 | ||
38 | #include <errno.h> | |
39 | ||
40 | #if !defined (errno) | |
41 | extern int errno; | |
42 | #endif | |
43 | ||
44 | #include "bashansi.h" | |
b80f6443 | 45 | #include "bashintl.h" |
cce855bc JA |
46 | |
47 | #include "memalloc.h" | |
48 | #include "shell.h" | |
49 | #include "flags.h" | |
50 | #include "execute_cmd.h" | |
51 | #include "redir.h" | |
52 | ||
53 | #if defined (BUFFERED_INPUT) | |
54 | # include "input.h" | |
55 | #endif | |
56 | ||
b80f6443 JA |
57 | int expanding_redir; |
58 | ||
cce855bc | 59 | extern int posixly_correct; |
cce855bc JA |
60 | extern REDIRECT *redirection_undo_list; |
61 | extern REDIRECT *exec_redirection_undo_list; | |
62 | ||
63 | /* Static functions defined and used in this file. */ | |
f73dda09 JA |
64 | static void add_undo_close_redirect __P((int)); |
65 | static void add_exec_redirect __P((REDIRECT *)); | |
66 | static int add_undo_redirect __P((int)); | |
67 | static int expandable_redirection_filename __P((REDIRECT *)); | |
68 | static int stdin_redirection __P((enum r_instruction, int)); | |
b80f6443 | 69 | static int do_redirection_internal __P((REDIRECT *, int)); |
f73dda09 JA |
70 | |
71 | static int write_here_document __P((int, WORD_DESC *)); | |
7117c2d2 JA |
72 | static int write_here_string __P((int, WORD_DESC *)); |
73 | static int here_document_to_fd __P((WORD_DESC *, enum r_instruction)); | |
f73dda09 JA |
74 | |
75 | static int redir_special_open __P((int, char *, int, int, enum r_instruction)); | |
76 | static int noclobber_open __P((char *, int, int, enum r_instruction)); | |
77 | static int redir_open __P((char *, int, int, enum r_instruction)); | |
cce855bc | 78 | |
7117c2d2 JA |
79 | /* Spare redirector used when translating [N]>&WORD[-] or [N]<&WORD[-] to |
80 | a new redirection and when creating the redirection undo list. */ | |
cce855bc JA |
81 | static REDIRECTEE rd; |
82 | ||
83 | /* Set to errno when a here document cannot be created for some reason. | |
84 | Used to print a reasonable error message. */ | |
85 | static int heredoc_errno; | |
86 | ||
87 | void | |
88 | redirection_error (temp, error) | |
89 | REDIRECT *temp; | |
90 | int error; | |
91 | { | |
f73dda09 | 92 | char *filename, *allocname; |
bb70624e | 93 | int oflags; |
cce855bc | 94 | |
f73dda09 JA |
95 | allocname = 0; |
96 | if (temp->redirector < 0) | |
97 | /* This can happen when read_token_word encounters overflow, like in | |
98 | exec 4294967297>x */ | |
b80f6443 | 99 | filename = _("file descriptor out of range"); |
f73dda09 JA |
100 | #ifdef EBADF |
101 | else if (temp->redirector >= 0 && errno == EBADF) | |
7117c2d2 JA |
102 | { |
103 | /* If we're dealing with two file descriptors, we have to guess about | |
104 | which one is invalid; in the cases of r_{duplicating,move}_input and | |
105 | r_{duplicating,move}_output we're here because dup2() failed. */ | |
106 | switch (temp->instruction) | |
107 | { | |
108 | case r_duplicating_input: | |
109 | case r_duplicating_output: | |
110 | case r_move_input: | |
111 | case r_move_output: | |
112 | filename = allocname = itos (temp->redirectee.dest); | |
113 | break; | |
114 | default: | |
115 | filename = allocname = itos (temp->redirector); | |
116 | break; | |
117 | } | |
118 | } | |
f73dda09 JA |
119 | #endif |
120 | else if (expandable_redirection_filename (temp)) | |
cce855bc | 121 | { |
bb70624e JA |
122 | if (posixly_correct && interactive_shell == 0) |
123 | { | |
124 | oflags = temp->redirectee.filename->flags; | |
125 | temp->redirectee.filename->flags |= W_NOGLOB; | |
126 | } | |
f73dda09 | 127 | filename = allocname = redirection_expand (temp->redirectee.filename); |
bb70624e | 128 | if (posixly_correct && interactive_shell == 0) |
28ef6c31 | 129 | temp->redirectee.filename->flags = oflags; |
cce855bc | 130 | if (filename == 0) |
f73dda09 | 131 | filename = temp->redirectee.filename->word; |
cce855bc | 132 | } |
f73dda09 JA |
133 | else if (temp->redirectee.dest < 0) |
134 | filename = "file descriptor out of range"; | |
cce855bc | 135 | else |
f73dda09 | 136 | filename = allocname = itos (temp->redirectee.dest); |
cce855bc JA |
137 | |
138 | switch (error) | |
139 | { | |
140 | case AMBIGUOUS_REDIRECT: | |
b80f6443 | 141 | internal_error (_("%s: ambiguous redirect"), filename); |
cce855bc JA |
142 | break; |
143 | ||
144 | case NOCLOBBER_REDIRECT: | |
b80f6443 | 145 | internal_error (_("%s: cannot overwrite existing file"), filename); |
cce855bc JA |
146 | break; |
147 | ||
148 | #if defined (RESTRICTED_SHELL) | |
149 | case RESTRICTED_REDIRECT: | |
b80f6443 | 150 | internal_error (_("%s: restricted: cannot redirect output"), filename); |
cce855bc JA |
151 | break; |
152 | #endif /* RESTRICTED_SHELL */ | |
153 | ||
154 | case HEREDOC_REDIRECT: | |
b80f6443 | 155 | internal_error (_("cannot create temp file for here document: %s"), strerror (heredoc_errno)); |
cce855bc JA |
156 | break; |
157 | ||
158 | default: | |
159 | internal_error ("%s: %s", filename, strerror (error)); | |
160 | break; | |
161 | } | |
162 | ||
f73dda09 | 163 | FREE (allocname); |
cce855bc JA |
164 | } |
165 | ||
b80f6443 JA |
166 | /* Perform the redirections on LIST. If flags & RX_ACTIVE, then actually |
167 | make input and output file descriptors, otherwise just do whatever is | |
168 | neccessary for side effecting. flags & RX_UNDOABLE says to remember | |
169 | how to undo the redirections later, if non-zero. If flags & RX_CLEXEC | |
170 | is non-zero, file descriptors opened in do_redirection () have their | |
171 | close-on-exec flag set. */ | |
cce855bc | 172 | int |
b80f6443 | 173 | do_redirections (list, flags) |
cce855bc | 174 | REDIRECT *list; |
b80f6443 | 175 | int flags; |
cce855bc JA |
176 | { |
177 | int error; | |
178 | REDIRECT *temp; | |
179 | ||
b80f6443 | 180 | if (flags & RX_UNDOABLE) |
cce855bc JA |
181 | { |
182 | if (redirection_undo_list) | |
183 | { | |
184 | dispose_redirects (redirection_undo_list); | |
185 | redirection_undo_list = (REDIRECT *)NULL; | |
186 | } | |
187 | if (exec_redirection_undo_list) | |
188 | dispose_exec_redirects (); | |
189 | } | |
190 | ||
191 | for (temp = list; temp; temp = temp->next) | |
192 | { | |
b80f6443 | 193 | error = do_redirection_internal (temp, flags); |
cce855bc JA |
194 | if (error) |
195 | { | |
196 | redirection_error (temp, error); | |
197 | return (error); | |
198 | } | |
199 | } | |
200 | return (0); | |
201 | } | |
202 | ||
203 | /* Return non-zero if the redirection pointed to by REDIRECT has a | |
204 | redirectee.filename that can be expanded. */ | |
205 | static int | |
206 | expandable_redirection_filename (redirect) | |
207 | REDIRECT *redirect; | |
208 | { | |
209 | switch (redirect->instruction) | |
210 | { | |
211 | case r_output_direction: | |
212 | case r_appending_to: | |
213 | case r_input_direction: | |
214 | case r_inputa_direction: | |
215 | case r_err_and_out: | |
216 | case r_input_output: | |
217 | case r_output_force: | |
218 | case r_duplicating_input_word: | |
219 | case r_duplicating_output_word: | |
7117c2d2 JA |
220 | case r_move_input_word: |
221 | case r_move_output_word: | |
cce855bc JA |
222 | return 1; |
223 | ||
224 | default: | |
225 | return 0; | |
226 | } | |
227 | } | |
228 | ||
229 | /* Expand the word in WORD returning a string. If WORD expands to | |
230 | multiple words (or no words), then return NULL. */ | |
231 | char * | |
232 | redirection_expand (word) | |
233 | WORD_DESC *word; | |
234 | { | |
235 | char *result; | |
236 | WORD_LIST *tlist1, *tlist2; | |
bb70624e JA |
237 | WORD_DESC *w; |
238 | ||
239 | w = copy_word (word); | |
240 | if (posixly_correct) | |
241 | w->flags |= W_NOSPLIT; | |
cce855bc | 242 | |
bb70624e | 243 | tlist1 = make_word_list (w, (WORD_LIST *)NULL); |
b80f6443 | 244 | expanding_redir = 1; |
cce855bc | 245 | tlist2 = expand_words_no_vars (tlist1); |
b80f6443 | 246 | expanding_redir = 0; |
cce855bc JA |
247 | dispose_words (tlist1); |
248 | ||
249 | if (!tlist2 || tlist2->next) | |
250 | { | |
251 | /* We expanded to no words, or to more than a single word. | |
252 | Dispose of the word list and return NULL. */ | |
253 | if (tlist2) | |
254 | dispose_words (tlist2); | |
255 | return ((char *)NULL); | |
256 | } | |
257 | result = string_list (tlist2); /* XXX savestring (tlist2->word->word)? */ | |
258 | dispose_words (tlist2); | |
259 | return (result); | |
260 | } | |
261 | ||
7117c2d2 JA |
262 | static int |
263 | write_here_string (fd, redirectee) | |
264 | int fd; | |
265 | WORD_DESC *redirectee; | |
266 | { | |
267 | char *herestr; | |
268 | int herelen, n, e; | |
269 | ||
270 | herestr = expand_string_to_string (redirectee->word, 0); | |
b80f6443 | 271 | herelen = STRLEN (herestr); |
7117c2d2 JA |
272 | |
273 | n = write (fd, herestr, herelen); | |
274 | if (n == herelen) | |
275 | { | |
276 | n = write (fd, "\n", 1); | |
277 | herelen = 1; | |
278 | } | |
279 | e = errno; | |
b80f6443 | 280 | FREE (herestr); |
7117c2d2 JA |
281 | if (n != herelen) |
282 | { | |
283 | if (e == 0) | |
284 | e = ENOSPC; | |
285 | return e; | |
286 | } | |
287 | return 0; | |
288 | } | |
289 | ||
cce855bc JA |
290 | /* Write the text of the here document pointed to by REDIRECTEE to the file |
291 | descriptor FD, which is already open to a temp file. Return 0 if the | |
292 | write is successful, otherwise return errno. */ | |
293 | static int | |
294 | write_here_document (fd, redirectee) | |
295 | int fd; | |
296 | WORD_DESC *redirectee; | |
297 | { | |
298 | char *document; | |
299 | int document_len, fd2; | |
300 | FILE *fp; | |
301 | register WORD_LIST *t, *tlist; | |
302 | ||
303 | /* Expand the text if the word that was specified had | |
304 | no quoting. The text that we expand is treated | |
305 | exactly as if it were surrounded by double quotes. */ | |
306 | ||
307 | if (redirectee->flags & W_QUOTED) | |
308 | { | |
309 | document = redirectee->word; | |
310 | document_len = strlen (document); | |
311 | /* Set errno to something reasonable if the write fails. */ | |
312 | if (write (fd, document, document_len) < document_len) | |
313 | { | |
314 | if (errno == 0) | |
315 | errno = ENOSPC; | |
316 | return (errno); | |
317 | } | |
318 | else | |
28ef6c31 | 319 | return 0; |
cce855bc JA |
320 | } |
321 | ||
322 | tlist = expand_string (redirectee->word, Q_HERE_DOCUMENT); | |
323 | if (tlist) | |
324 | { | |
325 | /* Try using buffered I/O (stdio) and writing a word | |
326 | at a time, letting stdio do the work of buffering | |
327 | for us rather than managing our own strings. Most | |
328 | stdios are not particularly fast, however -- this | |
329 | may need to be reconsidered later. */ | |
330 | if ((fd2 = dup (fd)) < 0 || (fp = fdopen (fd2, "w")) == NULL) | |
331 | { | |
332 | if (fd2 >= 0) | |
333 | close (fd2); | |
334 | return (errno); | |
335 | } | |
336 | errno = 0; | |
337 | for (t = tlist; t; t = t->next) | |
338 | { | |
339 | /* This is essentially the body of | |
340 | string_list_internal expanded inline. */ | |
341 | document = t->word->word; | |
342 | document_len = strlen (document); | |
343 | if (t != tlist) | |
344 | putc (' ', fp); /* separator */ | |
345 | fwrite (document, document_len, 1, fp); | |
346 | if (ferror (fp)) | |
347 | { | |
348 | if (errno == 0) | |
349 | errno = ENOSPC; | |
350 | fd2 = errno; | |
351 | fclose(fp); | |
352 | dispose_words (tlist); | |
353 | return (fd2); | |
354 | } | |
355 | } | |
cce855bc | 356 | dispose_words (tlist); |
f73dda09 JA |
357 | if (fclose (fp) != 0) |
358 | { | |
359 | if (errno == 0) | |
360 | errno = ENOSPC; | |
361 | return (errno); | |
362 | } | |
cce855bc JA |
363 | } |
364 | return 0; | |
365 | } | |
366 | ||
367 | /* Create a temporary file holding the text of the here document pointed to | |
368 | by REDIRECTEE, and return a file descriptor open for reading to the temp | |
369 | file. Return -1 on any error, and make sure errno is set appropriately. */ | |
370 | static int | |
7117c2d2 | 371 | here_document_to_fd (redirectee, ri) |
cce855bc | 372 | WORD_DESC *redirectee; |
7117c2d2 | 373 | enum r_instruction ri; |
cce855bc | 374 | { |
28ef6c31 | 375 | char *filename; |
bb70624e | 376 | int r, fd, fd2; |
cce855bc | 377 | |
28ef6c31 | 378 | fd = sh_mktmpfd ("sh-thd", MT_USERANDOM, &filename); |
cce855bc JA |
379 | |
380 | /* If we failed for some reason other than the file existing, abort */ | |
381 | if (fd < 0) | |
28ef6c31 JA |
382 | { |
383 | FREE (filename); | |
384 | return (fd); | |
385 | } | |
cce855bc JA |
386 | |
387 | errno = r = 0; /* XXX */ | |
388 | /* write_here_document returns 0 on success, errno on failure. */ | |
389 | if (redirectee->word) | |
7117c2d2 JA |
390 | r = (ri != r_reading_string) ? write_here_document (fd, redirectee) |
391 | : write_here_string (fd, redirectee); | |
cce855bc | 392 | |
cce855bc JA |
393 | if (r) |
394 | { | |
bb70624e | 395 | close (fd); |
cce855bc | 396 | unlink (filename); |
28ef6c31 | 397 | free (filename); |
cce855bc JA |
398 | errno = r; |
399 | return (-1); | |
400 | } | |
401 | ||
bb70624e JA |
402 | /* In an attempt to avoid races, we close the first fd only after opening |
403 | the second. */ | |
cce855bc | 404 | /* Make the document really temporary. Also make it the input. */ |
bb70624e | 405 | fd2 = open (filename, O_RDONLY, 0600); |
cce855bc | 406 | |
bb70624e | 407 | if (fd2 < 0) |
cce855bc JA |
408 | { |
409 | r = errno; | |
410 | unlink (filename); | |
28ef6c31 | 411 | free (filename); |
bb70624e | 412 | close (fd); |
cce855bc JA |
413 | errno = r; |
414 | return -1; | |
415 | } | |
416 | ||
bb70624e | 417 | close (fd); |
cce855bc JA |
418 | if (unlink (filename) < 0) |
419 | { | |
420 | r = errno; | |
28ef6c31 JA |
421 | #if defined (__CYGWIN__) |
422 | /* Under CygWin 1.1.0, the unlink will fail if the file is | |
423 | open. This hack will allow the previous action of silently | |
424 | ignoring the error, but will still leave the file there. This | |
425 | needs some kind of magic. */ | |
426 | if (r == EACCES) | |
427 | return (fd2); | |
428 | #endif /* __CYGWIN__ */ | |
bb70624e | 429 | close (fd2); |
28ef6c31 | 430 | free (filename); |
cce855bc JA |
431 | errno = r; |
432 | return (-1); | |
433 | } | |
434 | ||
28ef6c31 | 435 | free (filename); |
bb70624e | 436 | return (fd2); |
cce855bc JA |
437 | } |
438 | ||
bb70624e JA |
439 | #define RF_DEVFD 1 |
440 | #define RF_DEVSTDERR 2 | |
441 | #define RF_DEVSTDIN 3 | |
442 | #define RF_DEVSTDOUT 4 | |
443 | #define RF_DEVTCP 5 | |
444 | #define RF_DEVUDP 6 | |
445 | ||
446 | /* A list of pattern/value pairs for filenames that the redirection | |
447 | code handles specially. */ | |
448 | static STRING_INT_ALIST _redir_special_filenames[] = { | |
449 | #if !defined (HAVE_DEV_FD) | |
450 | { "/dev/fd/[0-9]*", RF_DEVFD }, | |
451 | #endif | |
452 | #if !defined (HAVE_DEV_STDIN) | |
453 | { "/dev/stderr", RF_DEVSTDERR }, | |
454 | { "/dev/stdin", RF_DEVSTDIN }, | |
455 | { "/dev/stdout", RF_DEVSTDOUT }, | |
456 | #endif | |
457 | #if defined (NETWORK_REDIRECTIONS) | |
458 | { "/dev/tcp/*/*", RF_DEVTCP }, | |
459 | { "/dev/udp/*/*", RF_DEVUDP }, | |
460 | #endif | |
461 | { (char *)NULL, -1 } | |
462 | }; | |
463 | ||
464 | static int | |
465 | redir_special_open (spec, filename, flags, mode, ri) | |
466 | int spec; | |
467 | char *filename; | |
468 | int flags, mode; | |
469 | enum r_instruction ri; | |
470 | { | |
471 | int fd; | |
f73dda09 | 472 | #if !defined (HAVE_DEV_FD) |
7117c2d2 | 473 | intmax_t lfd; |
f73dda09 | 474 | #endif |
bb70624e JA |
475 | |
476 | fd = -1; | |
477 | switch (spec) | |
478 | { | |
479 | #if !defined (HAVE_DEV_FD) | |
480 | case RF_DEVFD: | |
f73dda09 JA |
481 | if (all_digits (filename+8) && legal_number (filename+8, &lfd) && lfd == (int)lfd) |
482 | { | |
483 | fd = lfd; | |
484 | fd = fcntl (fd, F_DUPFD, 10); | |
485 | } | |
bb70624e JA |
486 | else |
487 | fd = AMBIGUOUS_REDIRECT; | |
488 | break; | |
489 | #endif | |
490 | ||
491 | #if !defined (HAVE_DEV_STDIN) | |
492 | case RF_DEVSTDIN: | |
493 | fd = fcntl (0, F_DUPFD, 10); | |
494 | break; | |
495 | case RF_DEVSTDOUT: | |
496 | fd = fcntl (1, F_DUPFD, 10); | |
497 | break; | |
498 | case RF_DEVSTDERR: | |
499 | fd = fcntl (2, F_DUPFD, 10); | |
500 | break; | |
501 | #endif | |
502 | ||
503 | #if defined (NETWORK_REDIRECTIONS) | |
504 | case RF_DEVTCP: | |
505 | case RF_DEVUDP: | |
506 | #if defined (HAVE_NETWORK) | |
507 | fd = netopen (filename); | |
508 | #else | |
b80f6443 | 509 | internal_warning (_("/dev/(tcp|udp)/host/port not supported without networking")); |
bb70624e JA |
510 | fd = open (filename, flags, mode); |
511 | #endif | |
512 | break; | |
513 | #endif /* NETWORK_REDIRECTIONS */ | |
514 | } | |
515 | ||
516 | return fd; | |
517 | } | |
518 | ||
cce855bc JA |
519 | /* Open FILENAME with FLAGS in noclobber mode, hopefully avoiding most |
520 | race conditions and avoiding the problem where the file is replaced | |
521 | between the stat(2) and open(2). */ | |
522 | static int | |
bb70624e | 523 | noclobber_open (filename, flags, mode, ri) |
cce855bc | 524 | char *filename; |
bb70624e | 525 | int flags, mode; |
cce855bc JA |
526 | enum r_instruction ri; |
527 | { | |
528 | int r, fd; | |
529 | struct stat finfo, finfo2; | |
530 | ||
531 | /* If the file exists and is a regular file, return an error | |
532 | immediately. */ | |
533 | r = stat (filename, &finfo); | |
534 | if (r == 0 && (S_ISREG (finfo.st_mode))) | |
535 | return (NOCLOBBER_REDIRECT); | |
536 | ||
537 | /* If the file was not present (r != 0), make sure we open it | |
538 | exclusively so that if it is created before we open it, our open | |
539 | will fail. Make sure that we do not truncate an existing file. | |
540 | Note that we don't turn on O_EXCL unless the stat failed -- if | |
541 | the file was not a regular file, we leave O_EXCL off. */ | |
542 | flags &= ~O_TRUNC; | |
543 | if (r != 0) | |
544 | { | |
bb70624e | 545 | fd = open (filename, flags|O_EXCL, mode); |
cce855bc JA |
546 | return ((fd < 0 && errno == EEXIST) ? NOCLOBBER_REDIRECT : fd); |
547 | } | |
bb70624e | 548 | fd = open (filename, flags, mode); |
cce855bc JA |
549 | |
550 | /* If the open failed, return the file descriptor right away. */ | |
551 | if (fd < 0) | |
552 | return (errno == EEXIST ? NOCLOBBER_REDIRECT : fd); | |
553 | ||
554 | /* OK, the open succeeded, but the file may have been changed from a | |
555 | non-regular file to a regular file between the stat and the open. | |
556 | We are assuming that the O_EXCL open handles the case where FILENAME | |
557 | did not exist and is symlinked to an existing file between the stat | |
558 | and open. */ | |
559 | ||
560 | /* If we can open it and fstat the file descriptor, and neither check | |
561 | revealed that it was a regular file, and the file has not been replaced, | |
562 | return the file descriptor. */ | |
563 | if ((fstat (fd, &finfo2) == 0) && (S_ISREG (finfo2.st_mode) == 0) && | |
564 | r == 0 && (S_ISREG (finfo.st_mode) == 0) && | |
565 | same_file (filename, filename, &finfo, &finfo2)) | |
566 | return fd; | |
567 | ||
568 | /* The file has been replaced. badness. */ | |
569 | close (fd); | |
570 | errno = EEXIST; | |
571 | return (NOCLOBBER_REDIRECT); | |
572 | } | |
573 | ||
bb70624e JA |
574 | static int |
575 | redir_open (filename, flags, mode, ri) | |
576 | char *filename; | |
577 | int flags, mode; | |
578 | enum r_instruction ri; | |
579 | { | |
580 | int fd, r; | |
581 | ||
582 | r = find_string_in_alist (filename, _redir_special_filenames, 1); | |
583 | if (r >= 0) | |
584 | return (redir_special_open (r, filename, flags, mode, ri)); | |
585 | ||
586 | /* If we are in noclobber mode, you are not allowed to overwrite | |
587 | existing files. Check before opening. */ | |
28ef6c31 | 588 | if (noclobber && CLOBBERING_REDIRECT (ri)) |
bb70624e JA |
589 | { |
590 | fd = noclobber_open (filename, flags, mode, ri); | |
591 | if (fd == NOCLOBBER_REDIRECT) | |
592 | return (NOCLOBBER_REDIRECT); | |
593 | } | |
594 | else | |
595 | { | |
596 | fd = open (filename, flags, mode); | |
597 | #if defined (AFS) | |
598 | if ((fd < 0) && (errno == EACCES)) | |
599 | fd = open (filename, flags & ~O_CREAT, mode); | |
600 | #endif /* AFS */ | |
601 | } | |
602 | ||
603 | return fd; | |
604 | } | |
605 | ||
cce855bc JA |
606 | /* Do the specific redirection requested. Returns errno or one of the |
607 | special redirection errors (*_REDIRECT) in case of error, 0 on success. | |
b80f6443 JA |
608 | If flags & RX_ACTIVE is zero, then just do whatever is neccessary to |
609 | produce the appropriate side effects. flags & RX_UNDOABLE, if non-zero, | |
610 | says to remember how to undo each redirection. If flags & RX_CLEXEC is | |
611 | non-zero, then we set all file descriptors > 2 that we open to be | |
612 | close-on-exec. */ | |
cce855bc | 613 | static int |
b80f6443 | 614 | do_redirection_internal (redirect, flags) |
cce855bc | 615 | REDIRECT *redirect; |
b80f6443 | 616 | int flags; |
cce855bc JA |
617 | { |
618 | WORD_DESC *redirectee; | |
bb70624e | 619 | int redir_fd, fd, redirector, r, oflags; |
7117c2d2 | 620 | intmax_t lfd; |
cce855bc JA |
621 | char *redirectee_word; |
622 | enum r_instruction ri; | |
623 | REDIRECT *new_redirect; | |
624 | ||
625 | redirectee = redirect->redirectee.filename; | |
626 | redir_fd = redirect->redirectee.dest; | |
627 | redirector = redirect->redirector; | |
628 | ri = redirect->instruction; | |
629 | ||
7117c2d2 | 630 | if (TRANSLATE_REDIRECT (ri)) |
cce855bc | 631 | { |
7117c2d2 | 632 | /* We have [N]>&WORD[-] or [N]<&WORD[-]. Expand WORD, then translate |
cce855bc JA |
633 | the redirection into a new one and continue. */ |
634 | redirectee_word = redirection_expand (redirectee); | |
635 | ||
7117c2d2 JA |
636 | /* XXX - what to do with [N]<&$w- where w is unset or null? ksh93 |
637 | closes N. */ | |
cce855bc JA |
638 | if (redirectee_word == 0) |
639 | return (AMBIGUOUS_REDIRECT); | |
640 | else if (redirectee_word[0] == '-' && redirectee_word[1] == '\0') | |
641 | { | |
f73dda09 | 642 | rd.dest = 0; |
cce855bc JA |
643 | new_redirect = make_redirection (redirector, r_close_this, rd); |
644 | } | |
645 | else if (all_digits (redirectee_word)) | |
646 | { | |
f73dda09 JA |
647 | if (legal_number (redirectee_word, &lfd) && (int)lfd == lfd) |
648 | rd.dest = lfd; | |
cce855bc | 649 | else |
f73dda09 | 650 | rd.dest = -1; /* XXX */ |
7117c2d2 JA |
651 | switch (ri) |
652 | { | |
653 | case r_duplicating_input_word: | |
654 | new_redirect = make_redirection (redirector, r_duplicating_input, rd); | |
655 | break; | |
656 | case r_duplicating_output_word: | |
657 | new_redirect = make_redirection (redirector, r_duplicating_output, rd); | |
658 | break; | |
659 | case r_move_input_word: | |
660 | new_redirect = make_redirection (redirector, r_move_input, rd); | |
661 | break; | |
662 | case r_move_output_word: | |
663 | new_redirect = make_redirection (redirector, r_move_output, rd); | |
664 | break; | |
665 | } | |
cce855bc JA |
666 | } |
667 | else if (ri == r_duplicating_output_word && redirector == 1) | |
668 | { | |
28ef6c31 JA |
669 | rd.filename = make_bare_word (redirectee_word); |
670 | new_redirect = make_redirection (1, r_err_and_out, rd); | |
cce855bc JA |
671 | } |
672 | else | |
673 | { | |
674 | free (redirectee_word); | |
675 | return (AMBIGUOUS_REDIRECT); | |
676 | } | |
677 | ||
678 | free (redirectee_word); | |
679 | ||
680 | /* Set up the variables needed by the rest of the function from the | |
681 | new redirection. */ | |
682 | if (new_redirect->instruction == r_err_and_out) | |
683 | { | |
684 | char *alloca_hack; | |
685 | ||
686 | /* Copy the word without allocating any memory that must be | |
687 | explicitly freed. */ | |
688 | redirectee = (WORD_DESC *)alloca (sizeof (WORD_DESC)); | |
689 | xbcopy ((char *)new_redirect->redirectee.filename, | |
690 | (char *)redirectee, sizeof (WORD_DESC)); | |
691 | ||
692 | alloca_hack = (char *) | |
693 | alloca (1 + strlen (new_redirect->redirectee.filename->word)); | |
694 | redirectee->word = alloca_hack; | |
695 | strcpy (redirectee->word, new_redirect->redirectee.filename->word); | |
696 | } | |
697 | else | |
698 | /* It's guaranteed to be an integer, and shouldn't be freed. */ | |
699 | redirectee = new_redirect->redirectee.filename; | |
700 | ||
701 | redir_fd = new_redirect->redirectee.dest; | |
702 | redirector = new_redirect->redirector; | |
703 | ri = new_redirect->instruction; | |
704 | ||
705 | /* Overwrite the flags element of the old redirect with the new value. */ | |
706 | redirect->flags = new_redirect->flags; | |
707 | dispose_redirects (new_redirect); | |
708 | } | |
709 | ||
710 | switch (ri) | |
711 | { | |
712 | case r_output_direction: | |
713 | case r_appending_to: | |
714 | case r_input_direction: | |
715 | case r_inputa_direction: | |
716 | case r_err_and_out: /* command &>filename */ | |
717 | case r_input_output: | |
718 | case r_output_force: | |
bb70624e | 719 | if (posixly_correct && interactive_shell == 0) |
28ef6c31 JA |
720 | { |
721 | oflags = redirectee->flags; | |
722 | redirectee->flags |= W_NOGLOB; | |
723 | } | |
cce855bc | 724 | redirectee_word = redirection_expand (redirectee); |
bb70624e JA |
725 | if (posixly_correct && interactive_shell == 0) |
726 | redirectee->flags = oflags; | |
cce855bc JA |
727 | |
728 | if (redirectee_word == 0) | |
729 | return (AMBIGUOUS_REDIRECT); | |
730 | ||
731 | #if defined (RESTRICTED_SHELL) | |
732 | if (restricted && (WRITE_REDIRECT (ri))) | |
733 | { | |
734 | free (redirectee_word); | |
735 | return (RESTRICTED_REDIRECT); | |
736 | } | |
737 | #endif /* RESTRICTED_SHELL */ | |
738 | ||
bb70624e | 739 | fd = redir_open (redirectee_word, redirect->flags, 0666, ri); |
cce855bc JA |
740 | free (redirectee_word); |
741 | ||
bb70624e | 742 | if (fd == NOCLOBBER_REDIRECT) |
28ef6c31 | 743 | return (fd); |
bb70624e | 744 | |
cce855bc JA |
745 | if (fd < 0) |
746 | return (errno); | |
747 | ||
b80f6443 | 748 | if (flags & RX_ACTIVE) |
cce855bc | 749 | { |
b80f6443 | 750 | if (flags & RX_UNDOABLE) |
f73dda09 JA |
751 | { |
752 | /* Only setup to undo it if the thing to undo is active. */ | |
753 | if ((fd != redirector) && (fcntl (redirector, F_GETFD, 0) != -1)) | |
754 | add_undo_redirect (redirector); | |
755 | else | |
756 | add_undo_close_redirect (redirector); | |
757 | } | |
cce855bc JA |
758 | |
759 | #if defined (BUFFERED_INPUT) | |
760 | check_bash_input (redirector); | |
761 | #endif | |
762 | ||
763 | if ((fd != redirector) && (dup2 (fd, redirector) < 0)) | |
764 | return (errno); | |
765 | ||
766 | #if defined (BUFFERED_INPUT) | |
767 | /* Do not change the buffered stream for an implicit redirection | |
768 | of /dev/null to fd 0 for asynchronous commands without job | |
769 | control (r_inputa_direction). */ | |
770 | if (ri == r_input_direction || ri == r_input_output) | |
771 | duplicate_buffered_stream (fd, redirector); | |
772 | #endif /* BUFFERED_INPUT */ | |
773 | ||
774 | /* | |
775 | * If we're remembering, then this is the result of a while, for | |
776 | * or until loop with a loop redirection, or a function/builtin | |
777 | * executing in the parent shell with a redirection. In the | |
778 | * function/builtin case, we want to set all file descriptors > 2 | |
779 | * to be close-on-exec to duplicate the effect of the old | |
780 | * for i = 3 to NOFILE close(i) loop. In the case of the loops, | |
781 | * both sh and ksh leave the file descriptors open across execs. | |
782 | * The Posix standard mentions only the exec builtin. | |
783 | */ | |
b80f6443 | 784 | if ((flags & RX_CLEXEC) && (redirector > 2)) |
cce855bc JA |
785 | SET_CLOSE_ON_EXEC (redirector); |
786 | } | |
787 | ||
788 | if (fd != redirector) | |
789 | { | |
790 | #if defined (BUFFERED_INPUT) | |
791 | if (INPUT_REDIRECT (ri)) | |
792 | close_buffered_fd (fd); | |
793 | else | |
794 | #endif /* !BUFFERED_INPUT */ | |
795 | close (fd); /* Don't close what we just opened! */ | |
796 | } | |
797 | ||
798 | /* If we are hacking both stdout and stderr, do the stderr | |
799 | redirection here. */ | |
800 | if (ri == r_err_and_out) | |
801 | { | |
b80f6443 | 802 | if (flags & RX_ACTIVE) |
cce855bc | 803 | { |
b80f6443 | 804 | if (flags & RX_UNDOABLE) |
cce855bc JA |
805 | add_undo_redirect (2); |
806 | if (dup2 (1, 2) < 0) | |
807 | return (errno); | |
808 | } | |
809 | } | |
810 | break; | |
811 | ||
812 | case r_reading_until: | |
813 | case r_deblank_reading_until: | |
7117c2d2 | 814 | case r_reading_string: |
cce855bc JA |
815 | /* REDIRECTEE is a pointer to a WORD_DESC containing the text of |
816 | the new input. Place it in a temporary file. */ | |
817 | if (redirectee) | |
818 | { | |
7117c2d2 | 819 | fd = here_document_to_fd (redirectee, ri); |
cce855bc JA |
820 | |
821 | if (fd < 0) | |
822 | { | |
823 | heredoc_errno = errno; | |
824 | return (HEREDOC_REDIRECT); | |
825 | } | |
826 | ||
b80f6443 | 827 | if (flags & RX_ACTIVE) |
cce855bc | 828 | { |
b80f6443 | 829 | if (flags & RX_UNDOABLE) |
f73dda09 JA |
830 | { |
831 | /* Only setup to undo it if the thing to undo is active. */ | |
832 | if ((fd != redirector) && (fcntl (redirector, F_GETFD, 0) != -1)) | |
833 | add_undo_redirect (redirector); | |
834 | else | |
835 | add_undo_close_redirect (redirector); | |
836 | } | |
cce855bc JA |
837 | |
838 | #if defined (BUFFERED_INPUT) | |
839 | check_bash_input (redirector); | |
840 | #endif | |
841 | if (fd != redirector && dup2 (fd, redirector) < 0) | |
842 | { | |
843 | r = errno; | |
844 | close (fd); | |
845 | return (r); | |
846 | } | |
847 | ||
848 | #if defined (BUFFERED_INPUT) | |
849 | duplicate_buffered_stream (fd, redirector); | |
850 | #endif | |
851 | ||
b80f6443 | 852 | if ((flags & RX_CLEXEC) && (redirector > 2)) |
cce855bc JA |
853 | SET_CLOSE_ON_EXEC (redirector); |
854 | } | |
855 | ||
bb70624e | 856 | if (fd != redirector) |
cce855bc | 857 | #if defined (BUFFERED_INPUT) |
bb70624e | 858 | close_buffered_fd (fd); |
cce855bc | 859 | #else |
bb70624e | 860 | close (fd); |
cce855bc JA |
861 | #endif |
862 | } | |
863 | break; | |
864 | ||
865 | case r_duplicating_input: | |
866 | case r_duplicating_output: | |
7117c2d2 JA |
867 | case r_move_input: |
868 | case r_move_output: | |
b80f6443 | 869 | if ((flags & RX_ACTIVE) && (redir_fd != redirector)) |
cce855bc | 870 | { |
b80f6443 | 871 | if (flags & RX_UNDOABLE) |
f73dda09 JA |
872 | { |
873 | /* Only setup to undo it if the thing to undo is active. */ | |
874 | if (fcntl (redirector, F_GETFD, 0) != -1) | |
875 | add_undo_redirect (redirector); | |
876 | else | |
877 | add_undo_close_redirect (redirector); | |
878 | } | |
cce855bc JA |
879 | |
880 | #if defined (BUFFERED_INPUT) | |
881 | check_bash_input (redirector); | |
882 | #endif | |
883 | /* This is correct. 2>&1 means dup2 (1, 2); */ | |
884 | if (dup2 (redir_fd, redirector) < 0) | |
885 | return (errno); | |
886 | ||
887 | #if defined (BUFFERED_INPUT) | |
7117c2d2 | 888 | if (ri == r_duplicating_input || ri == r_move_input) |
cce855bc JA |
889 | duplicate_buffered_stream (redir_fd, redirector); |
890 | #endif /* BUFFERED_INPUT */ | |
891 | ||
892 | /* First duplicate the close-on-exec state of redirectee. dup2 | |
893 | leaves the flag unset on the new descriptor, which means it | |
894 | stays open. Only set the close-on-exec bit for file descriptors | |
895 | greater than 2 in any case, since 0-2 should always be open | |
896 | unless closed by something like `exec 2<&-'. */ | |
897 | /* if ((already_set || set_unconditionally) && (ok_to_set)) | |
898 | set_it () */ | |
b80f6443 | 899 | if (((fcntl (redir_fd, F_GETFD, 0) == 1) || (flags & RX_CLEXEC)) && |
cce855bc JA |
900 | (redirector > 2)) |
901 | SET_CLOSE_ON_EXEC (redirector); | |
7117c2d2 JA |
902 | |
903 | /* dup-and-close redirection */ | |
904 | if (ri == r_move_input || ri == r_move_output) | |
905 | close (redir_fd); | |
cce855bc JA |
906 | } |
907 | break; | |
908 | ||
909 | case r_close_this: | |
b80f6443 | 910 | if (flags & RX_ACTIVE) |
cce855bc | 911 | { |
b80f6443 | 912 | if ((flags & RX_UNDOABLE) && (fcntl (redirector, F_GETFD, 0) != -1)) |
cce855bc JA |
913 | add_undo_redirect (redirector); |
914 | ||
915 | #if defined (BUFFERED_INPUT) | |
916 | check_bash_input (redirector); | |
917 | close_buffered_fd (redirector); | |
918 | #else /* !BUFFERED_INPUT */ | |
919 | close (redirector); | |
920 | #endif /* !BUFFERED_INPUT */ | |
921 | } | |
922 | break; | |
923 | ||
924 | case r_duplicating_input_word: | |
925 | case r_duplicating_output_word: | |
926 | break; | |
927 | } | |
928 | return (0); | |
929 | } | |
930 | ||
931 | #define SHELL_FD_BASE 10 | |
932 | ||
933 | /* Remember the file descriptor associated with the slot FD, | |
934 | on REDIRECTION_UNDO_LIST. Note that the list will be reversed | |
935 | before it is executed. Any redirections that need to be undone | |
936 | even if REDIRECTION_UNDO_LIST is discarded by the exec builtin | |
937 | are also saved on EXEC_REDIRECTION_UNDO_LIST. */ | |
938 | static int | |
939 | add_undo_redirect (fd) | |
940 | int fd; | |
941 | { | |
942 | int new_fd, clexec_flag; | |
943 | REDIRECT *new_redirect, *closer, *dummy_redirect; | |
944 | ||
945 | new_fd = fcntl (fd, F_DUPFD, SHELL_FD_BASE); | |
946 | ||
947 | if (new_fd < 0) | |
948 | { | |
b80f6443 | 949 | sys_error (_("redirection error: cannot duplicate fd")); |
cce855bc JA |
950 | return (-1); |
951 | } | |
952 | ||
953 | clexec_flag = fcntl (fd, F_GETFD, 0); | |
954 | ||
f73dda09 | 955 | rd.dest = 0; |
cce855bc JA |
956 | closer = make_redirection (new_fd, r_close_this, rd); |
957 | dummy_redirect = copy_redirects (closer); | |
958 | ||
f73dda09 | 959 | rd.dest = new_fd; |
28ef6c31 JA |
960 | if (fd == 0) |
961 | new_redirect = make_redirection (fd, r_duplicating_input, rd); | |
962 | else | |
963 | new_redirect = make_redirection (fd, r_duplicating_output, rd); | |
cce855bc JA |
964 | new_redirect->next = closer; |
965 | ||
966 | closer->next = redirection_undo_list; | |
967 | redirection_undo_list = new_redirect; | |
968 | ||
969 | /* Save redirections that need to be undone even if the undo list | |
970 | is thrown away by the `exec' builtin. */ | |
971 | add_exec_redirect (dummy_redirect); | |
972 | ||
973 | /* File descriptors used only for saving others should always be | |
974 | marked close-on-exec. Unfortunately, we have to preserve the | |
975 | close-on-exec state of the file descriptor we are saving, since | |
976 | fcntl (F_DUPFD) sets the new file descriptor to remain open | |
977 | across execs. If, however, the file descriptor whose state we | |
978 | are saving is <= 2, we can just set the close-on-exec flag, | |
979 | because file descriptors 0-2 should always be open-on-exec, | |
980 | and the restore above in do_redirection() will take care of it. */ | |
981 | if (clexec_flag || fd < 3) | |
982 | SET_CLOSE_ON_EXEC (new_fd); | |
983 | ||
984 | return (0); | |
985 | } | |
986 | ||
987 | /* Set up to close FD when we are finished with the current command | |
988 | and its redirections. */ | |
989 | static void | |
990 | add_undo_close_redirect (fd) | |
991 | int fd; | |
992 | { | |
993 | REDIRECT *closer; | |
994 | ||
f73dda09 | 995 | rd.dest = 0; |
cce855bc JA |
996 | closer = make_redirection (fd, r_close_this, rd); |
997 | closer->next = redirection_undo_list; | |
998 | redirection_undo_list = closer; | |
999 | } | |
1000 | ||
1001 | static void | |
1002 | add_exec_redirect (dummy_redirect) | |
1003 | REDIRECT *dummy_redirect; | |
1004 | { | |
1005 | dummy_redirect->next = exec_redirection_undo_list; | |
1006 | exec_redirection_undo_list = dummy_redirect; | |
1007 | } | |
1008 | ||
bb70624e JA |
1009 | /* Return 1 if the redirection specified by RI and REDIRECTOR alters the |
1010 | standard input. */ | |
1011 | static int | |
1012 | stdin_redirection (ri, redirector) | |
1013 | enum r_instruction ri; | |
1014 | int redirector; | |
1015 | { | |
1016 | switch (ri) | |
1017 | { | |
1018 | case r_input_direction: | |
1019 | case r_inputa_direction: | |
1020 | case r_input_output: | |
1021 | case r_reading_until: | |
1022 | case r_deblank_reading_until: | |
7117c2d2 | 1023 | case r_reading_string: |
bb70624e JA |
1024 | return (1); |
1025 | case r_duplicating_input: | |
1026 | case r_duplicating_input_word: | |
1027 | case r_close_this: | |
1028 | return (redirector == 0); | |
1029 | case r_output_direction: | |
1030 | case r_appending_to: | |
1031 | case r_duplicating_output: | |
1032 | case r_err_and_out: | |
1033 | case r_output_force: | |
1034 | case r_duplicating_output_word: | |
1035 | return (0); | |
1036 | } | |
1037 | return (0); | |
1038 | } | |
1039 | ||
cce855bc JA |
1040 | /* Return non-zero if any of the redirections in REDIRS alter the standard |
1041 | input. */ | |
1042 | int | |
1043 | stdin_redirects (redirs) | |
1044 | REDIRECT *redirs; | |
1045 | { | |
1046 | REDIRECT *rp; | |
1047 | int n; | |
1048 | ||
1049 | for (n = 0, rp = redirs; rp; rp = rp->next) | |
bb70624e | 1050 | n += stdin_redirection (rp->instruction, rp->redirector); |
cce855bc JA |
1051 | return n; |
1052 | } |