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Commit | Line | Data |
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cce855bc JA |
1 | /* redir.c -- Functions to perform input and output redirection. */ |
2 | ||
ac50fbac | 3 | /* Copyright (C) 1997-2012 Free Software Foundation, Inc. |
cce855bc JA |
4 | |
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
3185942a JA |
7 | Bash is free software: you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation, either version 3 of the License, or | |
10 | (at your option) any later version. | |
cce855bc | 11 | |
3185942a JA |
12 | Bash is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
cce855bc JA |
16 | |
17 | You should have received a copy of the GNU General Public License | |
3185942a JA |
18 | along with Bash. If not, see <http://www.gnu.org/licenses/>. |
19 | */ | |
20 | ||
cce855bc JA |
21 | #include "config.h" |
22 | ||
23 | #if !defined (__GNUC__) && !defined (HAVE_ALLOCA_H) && defined (_AIX) | |
24 | #pragma alloca | |
25 | #endif /* _AIX && RISC6000 && !__GNUC__ */ | |
26 | ||
27 | #include <stdio.h> | |
28 | #include "bashtypes.h" | |
b80f6443 | 29 | #if !defined (_MINIX) && defined (HAVE_SYS_FILE_H) |
cce855bc JA |
30 | # include <sys/file.h> |
31 | #endif | |
32 | #include "filecntl.h" | |
33 | #include "posixstat.h" | |
34 | ||
35 | #if defined (HAVE_UNISTD_H) | |
36 | # include <unistd.h> | |
37 | #endif | |
38 | ||
39 | #include <errno.h> | |
40 | ||
41 | #if !defined (errno) | |
42 | extern int errno; | |
43 | #endif | |
44 | ||
45 | #include "bashansi.h" | |
b80f6443 | 46 | #include "bashintl.h" |
cce855bc | 47 | #include "memalloc.h" |
3185942a JA |
48 | |
49 | #define NEED_FPURGE_DECL | |
50 | ||
cce855bc JA |
51 | #include "shell.h" |
52 | #include "flags.h" | |
53 | #include "execute_cmd.h" | |
54 | #include "redir.h" | |
55 | ||
56 | #if defined (BUFFERED_INPUT) | |
57 | # include "input.h" | |
58 | #endif | |
59 | ||
3185942a JA |
60 | #define SHELL_FD_BASE 10 |
61 | ||
b80f6443 JA |
62 | int expanding_redir; |
63 | ||
cce855bc | 64 | extern int posixly_correct; |
495aee44 | 65 | extern int last_command_exit_value; |
ac50fbac | 66 | extern int executing_builtin; |
cce855bc JA |
67 | extern REDIRECT *redirection_undo_list; |
68 | extern REDIRECT *exec_redirection_undo_list; | |
69 | ||
70 | /* Static functions defined and used in this file. */ | |
f73dda09 | 71 | static void add_exec_redirect __P((REDIRECT *)); |
3185942a | 72 | static int add_undo_redirect __P((int, enum r_instruction, int)); |
495aee44 | 73 | static int add_undo_close_redirect __P((int)); |
f73dda09 JA |
74 | static int expandable_redirection_filename __P((REDIRECT *)); |
75 | static int stdin_redirection __P((enum r_instruction, int)); | |
3185942a | 76 | static int undoablefd __P((int)); |
b80f6443 | 77 | static int do_redirection_internal __P((REDIRECT *, int)); |
f73dda09 JA |
78 | |
79 | static int write_here_document __P((int, WORD_DESC *)); | |
7117c2d2 JA |
80 | static int write_here_string __P((int, WORD_DESC *)); |
81 | static int here_document_to_fd __P((WORD_DESC *, enum r_instruction)); | |
f73dda09 JA |
82 | |
83 | static int redir_special_open __P((int, char *, int, int, enum r_instruction)); | |
84 | static int noclobber_open __P((char *, int, int, enum r_instruction)); | |
85 | static int redir_open __P((char *, int, int, enum r_instruction)); | |
cce855bc | 86 | |
0001803f CR |
87 | static int redir_varassign __P((REDIRECT *, int)); |
88 | static int redir_varvalue __P((REDIRECT *)); | |
89 | ||
7117c2d2 JA |
90 | /* Spare redirector used when translating [N]>&WORD[-] or [N]<&WORD[-] to |
91 | a new redirection and when creating the redirection undo list. */ | |
cce855bc JA |
92 | static REDIRECTEE rd; |
93 | ||
94 | /* Set to errno when a here document cannot be created for some reason. | |
95 | Used to print a reasonable error message. */ | |
96 | static int heredoc_errno; | |
97 | ||
495aee44 CR |
98 | #define REDIRECTION_ERROR(r, e, fd) \ |
99 | do { \ | |
100 | if ((r) < 0) \ | |
101 | { \ | |
102 | if (fd >= 0) \ | |
103 | close (fd); \ | |
104 | last_command_exit_value = EXECUTION_FAILURE;\ | |
105 | return ((e) == 0 ? EINVAL : (e));\ | |
106 | } \ | |
107 | } while (0) | |
108 | ||
cce855bc JA |
109 | void |
110 | redirection_error (temp, error) | |
111 | REDIRECT *temp; | |
112 | int error; | |
113 | { | |
f73dda09 | 114 | char *filename, *allocname; |
bb70624e | 115 | int oflags; |
cce855bc | 116 | |
f73dda09 | 117 | allocname = 0; |
0001803f | 118 | if (temp->rflags & REDIR_VARASSIGN) |
ac50fbac | 119 | filename = allocname = savestring (temp->redirector.filename->word); |
0001803f | 120 | else if (temp->redirector.dest < 0) |
f73dda09 JA |
121 | /* This can happen when read_token_word encounters overflow, like in |
122 | exec 4294967297>x */ | |
b80f6443 | 123 | filename = _("file descriptor out of range"); |
f73dda09 | 124 | #ifdef EBADF |
3185942a | 125 | /* This error can never involve NOCLOBBER */ |
0001803f | 126 | else if (error != NOCLOBBER_REDIRECT && temp->redirector.dest >= 0 && error == EBADF) |
7117c2d2 JA |
127 | { |
128 | /* If we're dealing with two file descriptors, we have to guess about | |
129 | which one is invalid; in the cases of r_{duplicating,move}_input and | |
130 | r_{duplicating,move}_output we're here because dup2() failed. */ | |
131 | switch (temp->instruction) | |
132 | { | |
133 | case r_duplicating_input: | |
134 | case r_duplicating_output: | |
135 | case r_move_input: | |
136 | case r_move_output: | |
137 | filename = allocname = itos (temp->redirectee.dest); | |
138 | break; | |
0001803f CR |
139 | case r_duplicating_input_word: |
140 | if (temp->redirector.dest == 0) /* Guess */ | |
141 | filename = temp->redirectee.filename->word; /* XXX */ | |
142 | else | |
143 | filename = allocname = itos (temp->redirector.dest); | |
144 | break; | |
145 | case r_duplicating_output_word: | |
146 | if (temp->redirector.dest == 1) /* Guess */ | |
147 | filename = temp->redirectee.filename->word; /* XXX */ | |
148 | else | |
149 | filename = allocname = itos (temp->redirector.dest); | |
150 | break; | |
7117c2d2 | 151 | default: |
0001803f | 152 | filename = allocname = itos (temp->redirector.dest); |
7117c2d2 JA |
153 | break; |
154 | } | |
155 | } | |
f73dda09 JA |
156 | #endif |
157 | else if (expandable_redirection_filename (temp)) | |
cce855bc | 158 | { |
0001803f | 159 | expandable_filename: |
ac50fbac | 160 | oflags = temp->redirectee.filename->flags; |
bb70624e | 161 | if (posixly_correct && interactive_shell == 0) |
ac50fbac CR |
162 | temp->redirectee.filename->flags |= W_NOGLOB; |
163 | temp->redirectee.filename->flags |= W_NOCOMSUB; | |
f73dda09 | 164 | filename = allocname = redirection_expand (temp->redirectee.filename); |
ac50fbac | 165 | temp->redirectee.filename->flags = oflags; |
cce855bc | 166 | if (filename == 0) |
f73dda09 | 167 | filename = temp->redirectee.filename->word; |
cce855bc | 168 | } |
f73dda09 | 169 | else if (temp->redirectee.dest < 0) |
ac50fbac | 170 | filename = _("file descriptor out of range"); |
cce855bc | 171 | else |
f73dda09 | 172 | filename = allocname = itos (temp->redirectee.dest); |
cce855bc JA |
173 | |
174 | switch (error) | |
175 | { | |
176 | case AMBIGUOUS_REDIRECT: | |
b80f6443 | 177 | internal_error (_("%s: ambiguous redirect"), filename); |
cce855bc JA |
178 | break; |
179 | ||
180 | case NOCLOBBER_REDIRECT: | |
b80f6443 | 181 | internal_error (_("%s: cannot overwrite existing file"), filename); |
cce855bc JA |
182 | break; |
183 | ||
184 | #if defined (RESTRICTED_SHELL) | |
185 | case RESTRICTED_REDIRECT: | |
b80f6443 | 186 | internal_error (_("%s: restricted: cannot redirect output"), filename); |
cce855bc JA |
187 | break; |
188 | #endif /* RESTRICTED_SHELL */ | |
189 | ||
190 | case HEREDOC_REDIRECT: | |
3185942a | 191 | internal_error (_("cannot create temp file for here-document: %s"), strerror (heredoc_errno)); |
cce855bc JA |
192 | break; |
193 | ||
0001803f CR |
194 | case BADVAR_REDIRECT: |
195 | internal_error (_("%s: cannot assign fd to variable"), filename); | |
196 | break; | |
197 | ||
cce855bc JA |
198 | default: |
199 | internal_error ("%s: %s", filename, strerror (error)); | |
200 | break; | |
201 | } | |
202 | ||
f73dda09 | 203 | FREE (allocname); |
cce855bc JA |
204 | } |
205 | ||
b80f6443 JA |
206 | /* Perform the redirections on LIST. If flags & RX_ACTIVE, then actually |
207 | make input and output file descriptors, otherwise just do whatever is | |
ac50fbac | 208 | necessary for side effecting. flags & RX_UNDOABLE says to remember |
b80f6443 JA |
209 | how to undo the redirections later, if non-zero. If flags & RX_CLEXEC |
210 | is non-zero, file descriptors opened in do_redirection () have their | |
211 | close-on-exec flag set. */ | |
cce855bc | 212 | int |
b80f6443 | 213 | do_redirections (list, flags) |
cce855bc | 214 | REDIRECT *list; |
b80f6443 | 215 | int flags; |
cce855bc JA |
216 | { |
217 | int error; | |
218 | REDIRECT *temp; | |
219 | ||
b80f6443 | 220 | if (flags & RX_UNDOABLE) |
cce855bc JA |
221 | { |
222 | if (redirection_undo_list) | |
223 | { | |
224 | dispose_redirects (redirection_undo_list); | |
225 | redirection_undo_list = (REDIRECT *)NULL; | |
226 | } | |
227 | if (exec_redirection_undo_list) | |
228 | dispose_exec_redirects (); | |
229 | } | |
230 | ||
231 | for (temp = list; temp; temp = temp->next) | |
232 | { | |
b80f6443 | 233 | error = do_redirection_internal (temp, flags); |
cce855bc JA |
234 | if (error) |
235 | { | |
236 | redirection_error (temp, error); | |
237 | return (error); | |
238 | } | |
239 | } | |
240 | return (0); | |
241 | } | |
242 | ||
243 | /* Return non-zero if the redirection pointed to by REDIRECT has a | |
244 | redirectee.filename that can be expanded. */ | |
245 | static int | |
246 | expandable_redirection_filename (redirect) | |
247 | REDIRECT *redirect; | |
248 | { | |
249 | switch (redirect->instruction) | |
250 | { | |
251 | case r_output_direction: | |
252 | case r_appending_to: | |
253 | case r_input_direction: | |
254 | case r_inputa_direction: | |
255 | case r_err_and_out: | |
3185942a | 256 | case r_append_err_and_out: |
cce855bc JA |
257 | case r_input_output: |
258 | case r_output_force: | |
259 | case r_duplicating_input_word: | |
260 | case r_duplicating_output_word: | |
7117c2d2 JA |
261 | case r_move_input_word: |
262 | case r_move_output_word: | |
cce855bc JA |
263 | return 1; |
264 | ||
265 | default: | |
266 | return 0; | |
267 | } | |
268 | } | |
269 | ||
270 | /* Expand the word in WORD returning a string. If WORD expands to | |
271 | multiple words (or no words), then return NULL. */ | |
272 | char * | |
273 | redirection_expand (word) | |
274 | WORD_DESC *word; | |
275 | { | |
276 | char *result; | |
277 | WORD_LIST *tlist1, *tlist2; | |
bb70624e | 278 | WORD_DESC *w; |
ac50fbac | 279 | int old; |
bb70624e JA |
280 | |
281 | w = copy_word (word); | |
282 | if (posixly_correct) | |
283 | w->flags |= W_NOSPLIT; | |
cce855bc | 284 | |
bb70624e | 285 | tlist1 = make_word_list (w, (WORD_LIST *)NULL); |
b80f6443 | 286 | expanding_redir = 1; |
ac50fbac CR |
287 | /* Now that we've changed the variable search order to ignore the temp |
288 | environment, see if we need to change the cached IFS values. */ | |
289 | sv_ifs ("IFS"); | |
cce855bc | 290 | tlist2 = expand_words_no_vars (tlist1); |
b80f6443 | 291 | expanding_redir = 0; |
ac50fbac CR |
292 | /* Now we need to change the variable search order back to include the temp |
293 | environment. We force the temp environment search by forcing | |
294 | executing_builtin to 1. This is what makes `read' get the right values | |
295 | for the IFS-related cached variables, for example. */ | |
296 | old = executing_builtin; | |
297 | executing_builtin = 1; | |
298 | sv_ifs ("IFS"); | |
299 | executing_builtin = old; | |
cce855bc JA |
300 | dispose_words (tlist1); |
301 | ||
ac50fbac | 302 | if (tlist2 == 0 || tlist2->next) |
cce855bc JA |
303 | { |
304 | /* We expanded to no words, or to more than a single word. | |
305 | Dispose of the word list and return NULL. */ | |
306 | if (tlist2) | |
307 | dispose_words (tlist2); | |
308 | return ((char *)NULL); | |
309 | } | |
310 | result = string_list (tlist2); /* XXX savestring (tlist2->word->word)? */ | |
311 | dispose_words (tlist2); | |
312 | return (result); | |
313 | } | |
314 | ||
7117c2d2 JA |
315 | static int |
316 | write_here_string (fd, redirectee) | |
317 | int fd; | |
318 | WORD_DESC *redirectee; | |
319 | { | |
320 | char *herestr; | |
ac50fbac | 321 | int herelen, n, e, old; |
7117c2d2 | 322 | |
0001803f | 323 | expanding_redir = 1; |
ac50fbac CR |
324 | /* Now that we've changed the variable search order to ignore the temp |
325 | environment, see if we need to change the cached IFS values. */ | |
326 | sv_ifs ("IFS"); | |
7117c2d2 | 327 | herestr = expand_string_to_string (redirectee->word, 0); |
0001803f | 328 | expanding_redir = 0; |
ac50fbac CR |
329 | /* Now we need to change the variable search order back to include the temp |
330 | environment. We force the temp environment search by forcing | |
331 | executing_builtin to 1. This is what makes `read' get the right values | |
332 | for the IFS-related cached variables, for example. */ | |
333 | old = executing_builtin; | |
334 | executing_builtin = 1; | |
335 | sv_ifs ("IFS"); | |
336 | executing_builtin = old; | |
337 | ||
b80f6443 | 338 | herelen = STRLEN (herestr); |
7117c2d2 JA |
339 | |
340 | n = write (fd, herestr, herelen); | |
341 | if (n == herelen) | |
342 | { | |
343 | n = write (fd, "\n", 1); | |
344 | herelen = 1; | |
345 | } | |
346 | e = errno; | |
b80f6443 | 347 | FREE (herestr); |
7117c2d2 JA |
348 | if (n != herelen) |
349 | { | |
350 | if (e == 0) | |
351 | e = ENOSPC; | |
352 | return e; | |
353 | } | |
354 | return 0; | |
355 | } | |
356 | ||
cce855bc JA |
357 | /* Write the text of the here document pointed to by REDIRECTEE to the file |
358 | descriptor FD, which is already open to a temp file. Return 0 if the | |
359 | write is successful, otherwise return errno. */ | |
360 | static int | |
361 | write_here_document (fd, redirectee) | |
362 | int fd; | |
363 | WORD_DESC *redirectee; | |
364 | { | |
365 | char *document; | |
ac50fbac | 366 | int document_len, fd2, old; |
cce855bc JA |
367 | FILE *fp; |
368 | register WORD_LIST *t, *tlist; | |
369 | ||
370 | /* Expand the text if the word that was specified had | |
371 | no quoting. The text that we expand is treated | |
372 | exactly as if it were surrounded by double quotes. */ | |
373 | ||
374 | if (redirectee->flags & W_QUOTED) | |
375 | { | |
376 | document = redirectee->word; | |
377 | document_len = strlen (document); | |
378 | /* Set errno to something reasonable if the write fails. */ | |
379 | if (write (fd, document, document_len) < document_len) | |
380 | { | |
381 | if (errno == 0) | |
382 | errno = ENOSPC; | |
383 | return (errno); | |
384 | } | |
385 | else | |
28ef6c31 | 386 | return 0; |
cce855bc JA |
387 | } |
388 | ||
0001803f | 389 | expanding_redir = 1; |
ac50fbac CR |
390 | /* Now that we've changed the variable search order to ignore the temp |
391 | environment, see if we need to change the cached IFS values. */ | |
392 | sv_ifs ("IFS"); | |
cce855bc | 393 | tlist = expand_string (redirectee->word, Q_HERE_DOCUMENT); |
0001803f | 394 | expanding_redir = 0; |
ac50fbac CR |
395 | /* Now we need to change the variable search order back to include the temp |
396 | environment. We force the temp environment search by forcing | |
397 | executing_builtin to 1. This is what makes `read' get the right values | |
398 | for the IFS-related cached variables, for example. */ | |
399 | old = executing_builtin; | |
400 | executing_builtin = 1; | |
401 | sv_ifs ("IFS"); | |
402 | executing_builtin = old; | |
0001803f | 403 | |
cce855bc JA |
404 | if (tlist) |
405 | { | |
406 | /* Try using buffered I/O (stdio) and writing a word | |
407 | at a time, letting stdio do the work of buffering | |
408 | for us rather than managing our own strings. Most | |
409 | stdios are not particularly fast, however -- this | |
410 | may need to be reconsidered later. */ | |
411 | if ((fd2 = dup (fd)) < 0 || (fp = fdopen (fd2, "w")) == NULL) | |
412 | { | |
413 | if (fd2 >= 0) | |
414 | close (fd2); | |
415 | return (errno); | |
416 | } | |
417 | errno = 0; | |
418 | for (t = tlist; t; t = t->next) | |
419 | { | |
420 | /* This is essentially the body of | |
421 | string_list_internal expanded inline. */ | |
422 | document = t->word->word; | |
423 | document_len = strlen (document); | |
424 | if (t != tlist) | |
425 | putc (' ', fp); /* separator */ | |
426 | fwrite (document, document_len, 1, fp); | |
427 | if (ferror (fp)) | |
428 | { | |
429 | if (errno == 0) | |
430 | errno = ENOSPC; | |
431 | fd2 = errno; | |
432 | fclose(fp); | |
433 | dispose_words (tlist); | |
434 | return (fd2); | |
435 | } | |
436 | } | |
cce855bc | 437 | dispose_words (tlist); |
f73dda09 JA |
438 | if (fclose (fp) != 0) |
439 | { | |
440 | if (errno == 0) | |
441 | errno = ENOSPC; | |
442 | return (errno); | |
443 | } | |
cce855bc JA |
444 | } |
445 | return 0; | |
446 | } | |
447 | ||
448 | /* Create a temporary file holding the text of the here document pointed to | |
449 | by REDIRECTEE, and return a file descriptor open for reading to the temp | |
450 | file. Return -1 on any error, and make sure errno is set appropriately. */ | |
451 | static int | |
7117c2d2 | 452 | here_document_to_fd (redirectee, ri) |
cce855bc | 453 | WORD_DESC *redirectee; |
7117c2d2 | 454 | enum r_instruction ri; |
cce855bc | 455 | { |
28ef6c31 | 456 | char *filename; |
bb70624e | 457 | int r, fd, fd2; |
cce855bc | 458 | |
3185942a | 459 | fd = sh_mktmpfd ("sh-thd", MT_USERANDOM|MT_USETMPDIR, &filename); |
cce855bc JA |
460 | |
461 | /* If we failed for some reason other than the file existing, abort */ | |
462 | if (fd < 0) | |
28ef6c31 JA |
463 | { |
464 | FREE (filename); | |
465 | return (fd); | |
466 | } | |
cce855bc JA |
467 | |
468 | errno = r = 0; /* XXX */ | |
469 | /* write_here_document returns 0 on success, errno on failure. */ | |
470 | if (redirectee->word) | |
7117c2d2 JA |
471 | r = (ri != r_reading_string) ? write_here_document (fd, redirectee) |
472 | : write_here_string (fd, redirectee); | |
cce855bc | 473 | |
cce855bc JA |
474 | if (r) |
475 | { | |
bb70624e | 476 | close (fd); |
cce855bc | 477 | unlink (filename); |
28ef6c31 | 478 | free (filename); |
cce855bc JA |
479 | errno = r; |
480 | return (-1); | |
481 | } | |
482 | ||
bb70624e JA |
483 | /* In an attempt to avoid races, we close the first fd only after opening |
484 | the second. */ | |
cce855bc | 485 | /* Make the document really temporary. Also make it the input. */ |
495aee44 | 486 | fd2 = open (filename, O_RDONLY|O_BINARY, 0600); |
cce855bc | 487 | |
bb70624e | 488 | if (fd2 < 0) |
cce855bc JA |
489 | { |
490 | r = errno; | |
491 | unlink (filename); | |
28ef6c31 | 492 | free (filename); |
bb70624e | 493 | close (fd); |
cce855bc JA |
494 | errno = r; |
495 | return -1; | |
496 | } | |
497 | ||
bb70624e | 498 | close (fd); |
cce855bc JA |
499 | if (unlink (filename) < 0) |
500 | { | |
501 | r = errno; | |
bb70624e | 502 | close (fd2); |
28ef6c31 | 503 | free (filename); |
cce855bc JA |
504 | errno = r; |
505 | return (-1); | |
506 | } | |
507 | ||
28ef6c31 | 508 | free (filename); |
bb70624e | 509 | return (fd2); |
cce855bc JA |
510 | } |
511 | ||
bb70624e JA |
512 | #define RF_DEVFD 1 |
513 | #define RF_DEVSTDERR 2 | |
514 | #define RF_DEVSTDIN 3 | |
515 | #define RF_DEVSTDOUT 4 | |
516 | #define RF_DEVTCP 5 | |
517 | #define RF_DEVUDP 6 | |
518 | ||
519 | /* A list of pattern/value pairs for filenames that the redirection | |
520 | code handles specially. */ | |
521 | static STRING_INT_ALIST _redir_special_filenames[] = { | |
522 | #if !defined (HAVE_DEV_FD) | |
523 | { "/dev/fd/[0-9]*", RF_DEVFD }, | |
524 | #endif | |
525 | #if !defined (HAVE_DEV_STDIN) | |
526 | { "/dev/stderr", RF_DEVSTDERR }, | |
527 | { "/dev/stdin", RF_DEVSTDIN }, | |
528 | { "/dev/stdout", RF_DEVSTDOUT }, | |
529 | #endif | |
530 | #if defined (NETWORK_REDIRECTIONS) | |
531 | { "/dev/tcp/*/*", RF_DEVTCP }, | |
532 | { "/dev/udp/*/*", RF_DEVUDP }, | |
533 | #endif | |
534 | { (char *)NULL, -1 } | |
535 | }; | |
536 | ||
537 | static int | |
538 | redir_special_open (spec, filename, flags, mode, ri) | |
539 | int spec; | |
540 | char *filename; | |
541 | int flags, mode; | |
542 | enum r_instruction ri; | |
543 | { | |
544 | int fd; | |
f73dda09 | 545 | #if !defined (HAVE_DEV_FD) |
7117c2d2 | 546 | intmax_t lfd; |
f73dda09 | 547 | #endif |
bb70624e JA |
548 | |
549 | fd = -1; | |
550 | switch (spec) | |
551 | { | |
552 | #if !defined (HAVE_DEV_FD) | |
553 | case RF_DEVFD: | |
f73dda09 JA |
554 | if (all_digits (filename+8) && legal_number (filename+8, &lfd) && lfd == (int)lfd) |
555 | { | |
556 | fd = lfd; | |
3185942a | 557 | fd = fcntl (fd, F_DUPFD, SHELL_FD_BASE); |
f73dda09 | 558 | } |
bb70624e JA |
559 | else |
560 | fd = AMBIGUOUS_REDIRECT; | |
561 | break; | |
562 | #endif | |
563 | ||
564 | #if !defined (HAVE_DEV_STDIN) | |
565 | case RF_DEVSTDIN: | |
3185942a | 566 | fd = fcntl (0, F_DUPFD, SHELL_FD_BASE); |
bb70624e JA |
567 | break; |
568 | case RF_DEVSTDOUT: | |
3185942a | 569 | fd = fcntl (1, F_DUPFD, SHELL_FD_BASE); |
bb70624e JA |
570 | break; |
571 | case RF_DEVSTDERR: | |
3185942a | 572 | fd = fcntl (2, F_DUPFD, SHELL_FD_BASE); |
bb70624e JA |
573 | break; |
574 | #endif | |
575 | ||
576 | #if defined (NETWORK_REDIRECTIONS) | |
577 | case RF_DEVTCP: | |
578 | case RF_DEVUDP: | |
579 | #if defined (HAVE_NETWORK) | |
580 | fd = netopen (filename); | |
581 | #else | |
b80f6443 | 582 | internal_warning (_("/dev/(tcp|udp)/host/port not supported without networking")); |
bb70624e JA |
583 | fd = open (filename, flags, mode); |
584 | #endif | |
585 | break; | |
586 | #endif /* NETWORK_REDIRECTIONS */ | |
587 | } | |
588 | ||
589 | return fd; | |
590 | } | |
591 | ||
cce855bc JA |
592 | /* Open FILENAME with FLAGS in noclobber mode, hopefully avoiding most |
593 | race conditions and avoiding the problem where the file is replaced | |
594 | between the stat(2) and open(2). */ | |
595 | static int | |
bb70624e | 596 | noclobber_open (filename, flags, mode, ri) |
cce855bc | 597 | char *filename; |
bb70624e | 598 | int flags, mode; |
cce855bc JA |
599 | enum r_instruction ri; |
600 | { | |
601 | int r, fd; | |
602 | struct stat finfo, finfo2; | |
603 | ||
604 | /* If the file exists and is a regular file, return an error | |
605 | immediately. */ | |
606 | r = stat (filename, &finfo); | |
607 | if (r == 0 && (S_ISREG (finfo.st_mode))) | |
608 | return (NOCLOBBER_REDIRECT); | |
609 | ||
610 | /* If the file was not present (r != 0), make sure we open it | |
611 | exclusively so that if it is created before we open it, our open | |
612 | will fail. Make sure that we do not truncate an existing file. | |
613 | Note that we don't turn on O_EXCL unless the stat failed -- if | |
614 | the file was not a regular file, we leave O_EXCL off. */ | |
615 | flags &= ~O_TRUNC; | |
616 | if (r != 0) | |
617 | { | |
bb70624e | 618 | fd = open (filename, flags|O_EXCL, mode); |
cce855bc JA |
619 | return ((fd < 0 && errno == EEXIST) ? NOCLOBBER_REDIRECT : fd); |
620 | } | |
bb70624e | 621 | fd = open (filename, flags, mode); |
cce855bc JA |
622 | |
623 | /* If the open failed, return the file descriptor right away. */ | |
624 | if (fd < 0) | |
625 | return (errno == EEXIST ? NOCLOBBER_REDIRECT : fd); | |
626 | ||
627 | /* OK, the open succeeded, but the file may have been changed from a | |
628 | non-regular file to a regular file between the stat and the open. | |
629 | We are assuming that the O_EXCL open handles the case where FILENAME | |
630 | did not exist and is symlinked to an existing file between the stat | |
631 | and open. */ | |
632 | ||
633 | /* If we can open it and fstat the file descriptor, and neither check | |
634 | revealed that it was a regular file, and the file has not been replaced, | |
635 | return the file descriptor. */ | |
636 | if ((fstat (fd, &finfo2) == 0) && (S_ISREG (finfo2.st_mode) == 0) && | |
637 | r == 0 && (S_ISREG (finfo.st_mode) == 0) && | |
638 | same_file (filename, filename, &finfo, &finfo2)) | |
639 | return fd; | |
640 | ||
641 | /* The file has been replaced. badness. */ | |
642 | close (fd); | |
643 | errno = EEXIST; | |
644 | return (NOCLOBBER_REDIRECT); | |
645 | } | |
646 | ||
bb70624e JA |
647 | static int |
648 | redir_open (filename, flags, mode, ri) | |
649 | char *filename; | |
650 | int flags, mode; | |
651 | enum r_instruction ri; | |
652 | { | |
ac50fbac | 653 | int fd, r, e; |
bb70624e JA |
654 | |
655 | r = find_string_in_alist (filename, _redir_special_filenames, 1); | |
656 | if (r >= 0) | |
657 | return (redir_special_open (r, filename, flags, mode, ri)); | |
658 | ||
659 | /* If we are in noclobber mode, you are not allowed to overwrite | |
660 | existing files. Check before opening. */ | |
28ef6c31 | 661 | if (noclobber && CLOBBERING_REDIRECT (ri)) |
bb70624e JA |
662 | { |
663 | fd = noclobber_open (filename, flags, mode, ri); | |
664 | if (fd == NOCLOBBER_REDIRECT) | |
665 | return (NOCLOBBER_REDIRECT); | |
666 | } | |
667 | else | |
668 | { | |
ac50fbac CR |
669 | do |
670 | { | |
671 | fd = open (filename, flags, mode); | |
672 | e = errno; | |
673 | if (fd < 0 && e == EINTR) | |
674 | QUIT; | |
675 | errno = e; | |
676 | } | |
677 | while (fd < 0 && errno == EINTR); | |
678 | ||
bb70624e JA |
679 | #if defined (AFS) |
680 | if ((fd < 0) && (errno == EACCES)) | |
95732b49 JA |
681 | { |
682 | fd = open (filename, flags & ~O_CREAT, mode); | |
683 | errno = EACCES; /* restore errno */ | |
684 | } | |
bb70624e JA |
685 | #endif /* AFS */ |
686 | } | |
687 | ||
688 | return fd; | |
689 | } | |
690 | ||
3185942a JA |
691 | static int |
692 | undoablefd (fd) | |
693 | int fd; | |
694 | { | |
695 | int clexec; | |
696 | ||
697 | clexec = fcntl (fd, F_GETFD, 0); | |
698 | if (clexec == -1 || (fd >= SHELL_FD_BASE && clexec == 1)) | |
699 | return 0; | |
700 | return 1; | |
701 | } | |
702 | ||
cce855bc JA |
703 | /* Do the specific redirection requested. Returns errno or one of the |
704 | special redirection errors (*_REDIRECT) in case of error, 0 on success. | |
ac50fbac | 705 | If flags & RX_ACTIVE is zero, then just do whatever is necessary to |
b80f6443 JA |
706 | produce the appropriate side effects. flags & RX_UNDOABLE, if non-zero, |
707 | says to remember how to undo each redirection. If flags & RX_CLEXEC is | |
708 | non-zero, then we set all file descriptors > 2 that we open to be | |
709 | close-on-exec. */ | |
cce855bc | 710 | static int |
b80f6443 | 711 | do_redirection_internal (redirect, flags) |
cce855bc | 712 | REDIRECT *redirect; |
b80f6443 | 713 | int flags; |
cce855bc JA |
714 | { |
715 | WORD_DESC *redirectee; | |
bb70624e | 716 | int redir_fd, fd, redirector, r, oflags; |
7117c2d2 | 717 | intmax_t lfd; |
cce855bc JA |
718 | char *redirectee_word; |
719 | enum r_instruction ri; | |
720 | REDIRECT *new_redirect; | |
0001803f | 721 | REDIRECTEE sd; |
cce855bc JA |
722 | |
723 | redirectee = redirect->redirectee.filename; | |
724 | redir_fd = redirect->redirectee.dest; | |
0001803f | 725 | redirector = redirect->redirector.dest; |
cce855bc JA |
726 | ri = redirect->instruction; |
727 | ||
0628567a JA |
728 | if (redirect->flags & RX_INTERNAL) |
729 | flags |= RX_INTERNAL; | |
95732b49 | 730 | |
7117c2d2 | 731 | if (TRANSLATE_REDIRECT (ri)) |
cce855bc | 732 | { |
0001803f CR |
733 | /* We have [N]>&WORD[-] or [N]<&WORD[-] (or {V}>&WORD[-] or {V}<&WORD-). |
734 | and WORD, then translate the redirection into a new one and | |
735 | continue. */ | |
cce855bc JA |
736 | redirectee_word = redirection_expand (redirectee); |
737 | ||
7117c2d2 JA |
738 | /* XXX - what to do with [N]<&$w- where w is unset or null? ksh93 |
739 | closes N. */ | |
cce855bc JA |
740 | if (redirectee_word == 0) |
741 | return (AMBIGUOUS_REDIRECT); | |
742 | else if (redirectee_word[0] == '-' && redirectee_word[1] == '\0') | |
743 | { | |
0001803f | 744 | sd = redirect->redirector; |
f73dda09 | 745 | rd.dest = 0; |
0001803f | 746 | new_redirect = make_redirection (sd, r_close_this, rd, 0); |
cce855bc JA |
747 | } |
748 | else if (all_digits (redirectee_word)) | |
749 | { | |
0001803f | 750 | sd = redirect->redirector; |
f73dda09 JA |
751 | if (legal_number (redirectee_word, &lfd) && (int)lfd == lfd) |
752 | rd.dest = lfd; | |
cce855bc | 753 | else |
f73dda09 | 754 | rd.dest = -1; /* XXX */ |
7117c2d2 JA |
755 | switch (ri) |
756 | { | |
757 | case r_duplicating_input_word: | |
0001803f | 758 | new_redirect = make_redirection (sd, r_duplicating_input, rd, 0); |
7117c2d2 JA |
759 | break; |
760 | case r_duplicating_output_word: | |
0001803f | 761 | new_redirect = make_redirection (sd, r_duplicating_output, rd, 0); |
7117c2d2 JA |
762 | break; |
763 | case r_move_input_word: | |
0001803f | 764 | new_redirect = make_redirection (sd, r_move_input, rd, 0); |
7117c2d2 JA |
765 | break; |
766 | case r_move_output_word: | |
0001803f | 767 | new_redirect = make_redirection (sd, r_move_output, rd, 0); |
7117c2d2 JA |
768 | break; |
769 | } | |
cce855bc | 770 | } |
0001803f | 771 | else if (ri == r_duplicating_output_word && (redirect->rflags & REDIR_VARASSIGN) == 0 && redirector == 1) |
cce855bc | 772 | { |
0001803f | 773 | sd = redirect->redirector; |
28ef6c31 | 774 | rd.filename = make_bare_word (redirectee_word); |
0001803f | 775 | new_redirect = make_redirection (sd, r_err_and_out, rd, 0); |
cce855bc JA |
776 | } |
777 | else | |
778 | { | |
779 | free (redirectee_word); | |
780 | return (AMBIGUOUS_REDIRECT); | |
781 | } | |
782 | ||
783 | free (redirectee_word); | |
784 | ||
785 | /* Set up the variables needed by the rest of the function from the | |
786 | new redirection. */ | |
787 | if (new_redirect->instruction == r_err_and_out) | |
788 | { | |
789 | char *alloca_hack; | |
790 | ||
791 | /* Copy the word without allocating any memory that must be | |
792 | explicitly freed. */ | |
793 | redirectee = (WORD_DESC *)alloca (sizeof (WORD_DESC)); | |
794 | xbcopy ((char *)new_redirect->redirectee.filename, | |
795 | (char *)redirectee, sizeof (WORD_DESC)); | |
796 | ||
797 | alloca_hack = (char *) | |
798 | alloca (1 + strlen (new_redirect->redirectee.filename->word)); | |
799 | redirectee->word = alloca_hack; | |
800 | strcpy (redirectee->word, new_redirect->redirectee.filename->word); | |
801 | } | |
802 | else | |
803 | /* It's guaranteed to be an integer, and shouldn't be freed. */ | |
804 | redirectee = new_redirect->redirectee.filename; | |
805 | ||
806 | redir_fd = new_redirect->redirectee.dest; | |
0001803f | 807 | redirector = new_redirect->redirector.dest; |
cce855bc JA |
808 | ri = new_redirect->instruction; |
809 | ||
810 | /* Overwrite the flags element of the old redirect with the new value. */ | |
811 | redirect->flags = new_redirect->flags; | |
812 | dispose_redirects (new_redirect); | |
813 | } | |
814 | ||
815 | switch (ri) | |
816 | { | |
817 | case r_output_direction: | |
818 | case r_appending_to: | |
819 | case r_input_direction: | |
820 | case r_inputa_direction: | |
821 | case r_err_and_out: /* command &>filename */ | |
3185942a | 822 | case r_append_err_and_out: /* command &>> filename */ |
cce855bc JA |
823 | case r_input_output: |
824 | case r_output_force: | |
bb70624e | 825 | if (posixly_correct && interactive_shell == 0) |
28ef6c31 JA |
826 | { |
827 | oflags = redirectee->flags; | |
828 | redirectee->flags |= W_NOGLOB; | |
829 | } | |
cce855bc | 830 | redirectee_word = redirection_expand (redirectee); |
bb70624e JA |
831 | if (posixly_correct && interactive_shell == 0) |
832 | redirectee->flags = oflags; | |
cce855bc JA |
833 | |
834 | if (redirectee_word == 0) | |
835 | return (AMBIGUOUS_REDIRECT); | |
836 | ||
837 | #if defined (RESTRICTED_SHELL) | |
838 | if (restricted && (WRITE_REDIRECT (ri))) | |
839 | { | |
840 | free (redirectee_word); | |
841 | return (RESTRICTED_REDIRECT); | |
842 | } | |
843 | #endif /* RESTRICTED_SHELL */ | |
844 | ||
bb70624e | 845 | fd = redir_open (redirectee_word, redirect->flags, 0666, ri); |
cce855bc JA |
846 | free (redirectee_word); |
847 | ||
bb70624e | 848 | if (fd == NOCLOBBER_REDIRECT) |
28ef6c31 | 849 | return (fd); |
bb70624e | 850 | |
cce855bc JA |
851 | if (fd < 0) |
852 | return (errno); | |
853 | ||
b80f6443 | 854 | if (flags & RX_ACTIVE) |
cce855bc | 855 | { |
0001803f | 856 | if (redirect->rflags & REDIR_VARASSIGN) |
495aee44 CR |
857 | { |
858 | redirector = fcntl (fd, F_DUPFD, SHELL_FD_BASE); /* XXX try this for now */ | |
859 | r = errno; | |
860 | if (redirector < 0) | |
861 | sys_error (_("redirection error: cannot duplicate fd")); | |
862 | REDIRECTION_ERROR (redirector, r, fd); | |
863 | } | |
0001803f | 864 | |
ac50fbac | 865 | if ((flags & RX_UNDOABLE) && (redirect->rflags & REDIR_VARASSIGN) == 0) |
f73dda09 JA |
866 | { |
867 | /* Only setup to undo it if the thing to undo is active. */ | |
868 | if ((fd != redirector) && (fcntl (redirector, F_GETFD, 0) != -1)) | |
495aee44 | 869 | r = add_undo_redirect (redirector, ri, -1); |
f73dda09 | 870 | else |
495aee44 | 871 | r = add_undo_close_redirect (redirector); |
495aee44 | 872 | REDIRECTION_ERROR (r, errno, fd); |
f73dda09 | 873 | } |
cce855bc JA |
874 | |
875 | #if defined (BUFFERED_INPUT) | |
ac50fbac CR |
876 | /* inhibit call to sync_buffered_stream() for async processes */ |
877 | if (redirector != 0 || (subshell_environment & SUBSHELL_ASYNC) == 0) | |
878 | check_bash_input (redirector); | |
cce855bc JA |
879 | #endif |
880 | ||
3185942a JA |
881 | /* Make sure there is no pending output before we change the state |
882 | of the underlying file descriptor, since the builtins use stdio | |
883 | for output. */ | |
884 | if (redirector == 1 && fileno (stdout) == redirector) | |
885 | { | |
886 | fflush (stdout); | |
887 | fpurge (stdout); | |
888 | } | |
889 | else if (redirector == 2 && fileno (stderr) == redirector) | |
890 | { | |
891 | fflush (stderr); | |
892 | fpurge (stderr); | |
893 | } | |
894 | ||
0001803f CR |
895 | if (redirect->rflags & REDIR_VARASSIGN) |
896 | { | |
897 | if ((r = redir_varassign (redirect, redirector)) < 0) | |
898 | { | |
899 | close (redirector); | |
900 | close (fd); | |
901 | return (r); /* XXX */ | |
902 | } | |
903 | } | |
904 | else if ((fd != redirector) && (dup2 (fd, redirector) < 0)) | |
cce855bc JA |
905 | return (errno); |
906 | ||
907 | #if defined (BUFFERED_INPUT) | |
908 | /* Do not change the buffered stream for an implicit redirection | |
909 | of /dev/null to fd 0 for asynchronous commands without job | |
910 | control (r_inputa_direction). */ | |
911 | if (ri == r_input_direction || ri == r_input_output) | |
912 | duplicate_buffered_stream (fd, redirector); | |
913 | #endif /* BUFFERED_INPUT */ | |
914 | ||
915 | /* | |
916 | * If we're remembering, then this is the result of a while, for | |
917 | * or until loop with a loop redirection, or a function/builtin | |
918 | * executing in the parent shell with a redirection. In the | |
919 | * function/builtin case, we want to set all file descriptors > 2 | |
920 | * to be close-on-exec to duplicate the effect of the old | |
921 | * for i = 3 to NOFILE close(i) loop. In the case of the loops, | |
922 | * both sh and ksh leave the file descriptors open across execs. | |
923 | * The Posix standard mentions only the exec builtin. | |
924 | */ | |
b80f6443 | 925 | if ((flags & RX_CLEXEC) && (redirector > 2)) |
cce855bc JA |
926 | SET_CLOSE_ON_EXEC (redirector); |
927 | } | |
928 | ||
929 | if (fd != redirector) | |
930 | { | |
931 | #if defined (BUFFERED_INPUT) | |
932 | if (INPUT_REDIRECT (ri)) | |
933 | close_buffered_fd (fd); | |
934 | else | |
935 | #endif /* !BUFFERED_INPUT */ | |
936 | close (fd); /* Don't close what we just opened! */ | |
937 | } | |
938 | ||
939 | /* If we are hacking both stdout and stderr, do the stderr | |
0001803f | 940 | redirection here. XXX - handle {var} here? */ |
3185942a | 941 | if (ri == r_err_and_out || ri == r_append_err_and_out) |
cce855bc | 942 | { |
b80f6443 | 943 | if (flags & RX_ACTIVE) |
cce855bc | 944 | { |
b80f6443 | 945 | if (flags & RX_UNDOABLE) |
3185942a | 946 | add_undo_redirect (2, ri, -1); |
cce855bc JA |
947 | if (dup2 (1, 2) < 0) |
948 | return (errno); | |
949 | } | |
950 | } | |
951 | break; | |
952 | ||
953 | case r_reading_until: | |
954 | case r_deblank_reading_until: | |
7117c2d2 | 955 | case r_reading_string: |
cce855bc JA |
956 | /* REDIRECTEE is a pointer to a WORD_DESC containing the text of |
957 | the new input. Place it in a temporary file. */ | |
958 | if (redirectee) | |
959 | { | |
7117c2d2 | 960 | fd = here_document_to_fd (redirectee, ri); |
cce855bc JA |
961 | |
962 | if (fd < 0) | |
963 | { | |
964 | heredoc_errno = errno; | |
965 | return (HEREDOC_REDIRECT); | |
966 | } | |
967 | ||
0001803f | 968 | if (redirect->rflags & REDIR_VARASSIGN) |
495aee44 CR |
969 | { |
970 | redirector = fcntl (fd, F_DUPFD, SHELL_FD_BASE); /* XXX try this for now */ | |
971 | r = errno; | |
972 | if (redirector < 0) | |
973 | sys_error (_("redirection error: cannot duplicate fd")); | |
974 | REDIRECTION_ERROR (redirector, r, fd); | |
975 | } | |
0001803f | 976 | |
b80f6443 | 977 | if (flags & RX_ACTIVE) |
cce855bc | 978 | { |
ac50fbac | 979 | if ((flags & RX_UNDOABLE) && (redirect->rflags & REDIR_VARASSIGN) == 0) |
f73dda09 JA |
980 | { |
981 | /* Only setup to undo it if the thing to undo is active. */ | |
982 | if ((fd != redirector) && (fcntl (redirector, F_GETFD, 0) != -1)) | |
495aee44 | 983 | r = add_undo_redirect (redirector, ri, -1); |
f73dda09 | 984 | else |
495aee44 | 985 | r = add_undo_close_redirect (redirector); |
495aee44 | 986 | REDIRECTION_ERROR (r, errno, fd); |
f73dda09 | 987 | } |
cce855bc JA |
988 | |
989 | #if defined (BUFFERED_INPUT) | |
990 | check_bash_input (redirector); | |
991 | #endif | |
0001803f CR |
992 | if (redirect->rflags & REDIR_VARASSIGN) |
993 | { | |
994 | if ((r = redir_varassign (redirect, redirector)) < 0) | |
995 | { | |
996 | close (redirector); | |
997 | close (fd); | |
998 | return (r); /* XXX */ | |
999 | } | |
1000 | } | |
1001 | else if (fd != redirector && dup2 (fd, redirector) < 0) | |
cce855bc JA |
1002 | { |
1003 | r = errno; | |
1004 | close (fd); | |
1005 | return (r); | |
1006 | } | |
1007 | ||
1008 | #if defined (BUFFERED_INPUT) | |
1009 | duplicate_buffered_stream (fd, redirector); | |
1010 | #endif | |
1011 | ||
b80f6443 | 1012 | if ((flags & RX_CLEXEC) && (redirector > 2)) |
cce855bc JA |
1013 | SET_CLOSE_ON_EXEC (redirector); |
1014 | } | |
1015 | ||
bb70624e | 1016 | if (fd != redirector) |
cce855bc | 1017 | #if defined (BUFFERED_INPUT) |
bb70624e | 1018 | close_buffered_fd (fd); |
cce855bc | 1019 | #else |
bb70624e | 1020 | close (fd); |
cce855bc JA |
1021 | #endif |
1022 | } | |
1023 | break; | |
1024 | ||
1025 | case r_duplicating_input: | |
1026 | case r_duplicating_output: | |
7117c2d2 JA |
1027 | case r_move_input: |
1028 | case r_move_output: | |
0001803f | 1029 | if ((flags & RX_ACTIVE) && (redirect->rflags & REDIR_VARASSIGN)) |
495aee44 CR |
1030 | { |
1031 | redirector = fcntl (redir_fd, F_DUPFD, SHELL_FD_BASE); /* XXX try this for now */ | |
1032 | r = errno; | |
1033 | if (redirector < 0) | |
1034 | sys_error (_("redirection error: cannot duplicate fd")); | |
1035 | REDIRECTION_ERROR (redirector, r, -1); | |
1036 | } | |
0001803f | 1037 | |
b80f6443 | 1038 | if ((flags & RX_ACTIVE) && (redir_fd != redirector)) |
cce855bc | 1039 | { |
ac50fbac | 1040 | if ((flags & RX_UNDOABLE) && (redirect->rflags & REDIR_VARASSIGN) == 0) |
f73dda09 JA |
1041 | { |
1042 | /* Only setup to undo it if the thing to undo is active. */ | |
1043 | if (fcntl (redirector, F_GETFD, 0) != -1) | |
495aee44 | 1044 | r = add_undo_redirect (redirector, ri, redir_fd); |
f73dda09 | 1045 | else |
495aee44 | 1046 | r = add_undo_close_redirect (redirector); |
495aee44 | 1047 | REDIRECTION_ERROR (r, errno, -1); |
f73dda09 | 1048 | } |
f281b8f4 CR |
1049 | if ((flags & RX_UNDOABLE) && (ri == r_move_input || ri == r_move_output)) |
1050 | { | |
1051 | /* r_move_input and r_move_output add an additional close() | |
1052 | that needs to be undone */ | |
1053 | if (fcntl (redirector, F_GETFD, 0) != -1) | |
1054 | { | |
1055 | r = add_undo_redirect (redir_fd, r_close_this, -1); | |
1056 | REDIRECTION_ERROR (r, errno, -1); | |
1057 | } | |
1058 | } | |
cce855bc | 1059 | #if defined (BUFFERED_INPUT) |
ac50fbac CR |
1060 | /* inhibit call to sync_buffered_stream() for async processes */ |
1061 | if (redirector != 0 || (subshell_environment & SUBSHELL_ASYNC) == 0) | |
1062 | check_bash_input (redirector); | |
cce855bc | 1063 | #endif |
0001803f CR |
1064 | if (redirect->rflags & REDIR_VARASSIGN) |
1065 | { | |
1066 | if ((r = redir_varassign (redirect, redirector)) < 0) | |
1067 | { | |
1068 | close (redirector); | |
1069 | return (r); /* XXX */ | |
1070 | } | |
1071 | } | |
cce855bc | 1072 | /* This is correct. 2>&1 means dup2 (1, 2); */ |
0001803f | 1073 | else if (dup2 (redir_fd, redirector) < 0) |
cce855bc JA |
1074 | return (errno); |
1075 | ||
1076 | #if defined (BUFFERED_INPUT) | |
7117c2d2 | 1077 | if (ri == r_duplicating_input || ri == r_move_input) |
cce855bc JA |
1078 | duplicate_buffered_stream (redir_fd, redirector); |
1079 | #endif /* BUFFERED_INPUT */ | |
1080 | ||
1081 | /* First duplicate the close-on-exec state of redirectee. dup2 | |
1082 | leaves the flag unset on the new descriptor, which means it | |
1083 | stays open. Only set the close-on-exec bit for file descriptors | |
1084 | greater than 2 in any case, since 0-2 should always be open | |
95732b49 JA |
1085 | unless closed by something like `exec 2<&-'. It should always |
1086 | be safe to set fds > 2 to close-on-exec if they're being used to | |
1087 | save file descriptors < 2, since we don't need to preserve the | |
1088 | state of the close-on-exec flag for those fds -- they should | |
1089 | always be open. */ | |
cce855bc JA |
1090 | /* if ((already_set || set_unconditionally) && (ok_to_set)) |
1091 | set_it () */ | |
95732b49 JA |
1092 | #if 0 |
1093 | if (((fcntl (redir_fd, F_GETFD, 0) == 1) || redir_fd < 2 || (flags & RX_CLEXEC)) && | |
1094 | (redirector > 2)) | |
1095 | #else | |
1096 | if (((fcntl (redir_fd, F_GETFD, 0) == 1) || (redir_fd < 2 && (flags & RX_INTERNAL)) || (flags & RX_CLEXEC)) && | |
cce855bc | 1097 | (redirector > 2)) |
95732b49 | 1098 | #endif |
cce855bc | 1099 | SET_CLOSE_ON_EXEC (redirector); |
7117c2d2 | 1100 | |
3185942a JA |
1101 | /* When undoing saving of non-standard file descriptors (>=3) using |
1102 | file descriptors >= SHELL_FD_BASE, we set the saving fd to be | |
1103 | close-on-exec and use a flag to decide how to set close-on-exec | |
1104 | when the fd is restored. */ | |
ac50fbac | 1105 | if ((redirect->flags & RX_INTERNAL) && (redirect->flags & RX_SAVCLEXEC) && redirector >= 3 && (redir_fd >= SHELL_FD_BASE || (redirect->flags & RX_SAVEFD))) |
3185942a JA |
1106 | SET_OPEN_ON_EXEC (redirector); |
1107 | ||
7117c2d2 JA |
1108 | /* dup-and-close redirection */ |
1109 | if (ri == r_move_input || ri == r_move_output) | |
3185942a | 1110 | { |
0001803f CR |
1111 | xtrace_fdchk (redir_fd); |
1112 | ||
3185942a JA |
1113 | close (redir_fd); |
1114 | #if defined (COPROCESS_SUPPORT) | |
1115 | coproc_fdchk (redir_fd); /* XXX - loses coproc fds */ | |
1116 | #endif | |
1117 | } | |
cce855bc JA |
1118 | } |
1119 | break; | |
1120 | ||
1121 | case r_close_this: | |
b80f6443 | 1122 | if (flags & RX_ACTIVE) |
cce855bc | 1123 | { |
0001803f CR |
1124 | if (redirect->rflags & REDIR_VARASSIGN) |
1125 | { | |
1126 | redirector = redir_varvalue (redirect); | |
1127 | if (redirector < 0) | |
1128 | return AMBIGUOUS_REDIRECT; | |
1129 | } | |
1130 | ||
495aee44 | 1131 | r = 0; |
ac50fbac | 1132 | /* XXX - only if REDIR_VARASSIGN not set? */ |
b80f6443 | 1133 | if ((flags & RX_UNDOABLE) && (fcntl (redirector, F_GETFD, 0) != -1)) |
495aee44 CR |
1134 | { |
1135 | r = add_undo_redirect (redirector, ri, -1); | |
1136 | REDIRECTION_ERROR (r, errno, redirector); | |
1137 | } | |
3185942a JA |
1138 | |
1139 | #if defined (COPROCESS_SUPPORT) | |
1140 | coproc_fdchk (redirector); | |
1141 | #endif | |
0001803f | 1142 | xtrace_fdchk (redirector); |
cce855bc JA |
1143 | |
1144 | #if defined (BUFFERED_INPUT) | |
ac50fbac CR |
1145 | /* inhibit call to sync_buffered_stream() for async processes */ |
1146 | if (redirector != 0 || (subshell_environment & SUBSHELL_ASYNC) == 0) | |
1147 | check_bash_input (redirector); | |
774d3bf6 | 1148 | r = close_buffered_fd (redirector); |
cce855bc | 1149 | #else /* !BUFFERED_INPUT */ |
774d3bf6 | 1150 | r = close (redirector); |
cce855bc | 1151 | #endif /* !BUFFERED_INPUT */ |
ac50fbac | 1152 | |
774d3bf6 CR |
1153 | if (r < 0 && (flags & RX_INTERNAL) && (errno == EIO || errno == ENOSPC)) |
1154 | REDIRECTION_ERROR (r, errno, -1); | |
cce855bc JA |
1155 | } |
1156 | break; | |
1157 | ||
1158 | case r_duplicating_input_word: | |
1159 | case r_duplicating_output_word: | |
1160 | break; | |
1161 | } | |
1162 | return (0); | |
1163 | } | |
1164 | ||
cce855bc JA |
1165 | /* Remember the file descriptor associated with the slot FD, |
1166 | on REDIRECTION_UNDO_LIST. Note that the list will be reversed | |
1167 | before it is executed. Any redirections that need to be undone | |
1168 | even if REDIRECTION_UNDO_LIST is discarded by the exec builtin | |
3185942a JA |
1169 | are also saved on EXEC_REDIRECTION_UNDO_LIST. FDBASE says where to |
1170 | start the duplicating. If it's less than SHELL_FD_BASE, we're ok, | |
1171 | and can use SHELL_FD_BASE (-1 == don't care). If it's >= SHELL_FD_BASE, | |
1172 | we have to make sure we don't use fdbase to save a file descriptor, | |
1173 | since we're going to use it later (e.g., make sure we don't save fd 0 | |
1174 | to fd 10 if we have a redirection like 0<&10). If the value of fdbase | |
1175 | puts the process over its fd limit, causing fcntl to fail, we try | |
495aee44 | 1176 | again with SHELL_FD_BASE. Return 0 on success, -1 on error. */ |
cce855bc | 1177 | static int |
3185942a | 1178 | add_undo_redirect (fd, ri, fdbase) |
cce855bc | 1179 | int fd; |
0628567a | 1180 | enum r_instruction ri; |
3185942a | 1181 | int fdbase; |
cce855bc | 1182 | { |
ac50fbac | 1183 | int new_fd, clexec_flag, savefd_flag; |
cce855bc | 1184 | REDIRECT *new_redirect, *closer, *dummy_redirect; |
0001803f | 1185 | REDIRECTEE sd; |
cce855bc | 1186 | |
ac50fbac | 1187 | savefd_flag = 0; |
3185942a JA |
1188 | new_fd = fcntl (fd, F_DUPFD, (fdbase < SHELL_FD_BASE) ? SHELL_FD_BASE : fdbase+1); |
1189 | if (new_fd < 0) | |
1190 | new_fd = fcntl (fd, F_DUPFD, SHELL_FD_BASE); | |
ac50fbac CR |
1191 | if (new_fd < 0) |
1192 | { | |
1193 | new_fd = fcntl (fd, F_DUPFD, 0); | |
1194 | savefd_flag = 1; | |
1195 | } | |
cce855bc JA |
1196 | |
1197 | if (new_fd < 0) | |
1198 | { | |
b80f6443 | 1199 | sys_error (_("redirection error: cannot duplicate fd")); |
cce855bc JA |
1200 | return (-1); |
1201 | } | |
1202 | ||
1203 | clexec_flag = fcntl (fd, F_GETFD, 0); | |
1204 | ||
0001803f | 1205 | sd.dest = new_fd; |
f73dda09 | 1206 | rd.dest = 0; |
0001803f | 1207 | closer = make_redirection (sd, r_close_this, rd, 0); |
95732b49 | 1208 | closer->flags |= RX_INTERNAL; |
cce855bc JA |
1209 | dummy_redirect = copy_redirects (closer); |
1210 | ||
0001803f | 1211 | sd.dest = fd; |
f73dda09 | 1212 | rd.dest = new_fd; |
28ef6c31 | 1213 | if (fd == 0) |
0001803f | 1214 | new_redirect = make_redirection (sd, r_duplicating_input, rd, 0); |
28ef6c31 | 1215 | else |
0001803f | 1216 | new_redirect = make_redirection (sd, r_duplicating_output, rd, 0); |
95732b49 | 1217 | new_redirect->flags |= RX_INTERNAL; |
ac50fbac CR |
1218 | if (savefd_flag) |
1219 | new_redirect->flags |= RX_SAVEFD; | |
1220 | if (clexec_flag == 0 && fd >= 3 && (new_fd >= SHELL_FD_BASE || savefd_flag)) | |
3185942a | 1221 | new_redirect->flags |= RX_SAVCLEXEC; |
cce855bc JA |
1222 | new_redirect->next = closer; |
1223 | ||
1224 | closer->next = redirection_undo_list; | |
1225 | redirection_undo_list = new_redirect; | |
1226 | ||
1227 | /* Save redirections that need to be undone even if the undo list | |
1228 | is thrown away by the `exec' builtin. */ | |
1229 | add_exec_redirect (dummy_redirect); | |
1230 | ||
95732b49 JA |
1231 | /* experimental: if we're saving a redirection to undo for a file descriptor |
1232 | above SHELL_FD_BASE, add a redirection to be undone if the exec builtin | |
3185942a JA |
1233 | causes redirections to be discarded. There needs to be a difference |
1234 | between fds that are used to save other fds and then are the target of | |
495aee44 | 1235 | user redirections and fds that are just the target of user redirections. |
3185942a JA |
1236 | We use the close-on-exec flag to tell the difference; fds > SHELL_FD_BASE |
1237 | that have the close-on-exec flag set are assumed to be fds used internally | |
1238 | to save others. */ | |
1239 | if (fd >= SHELL_FD_BASE && ri != r_close_this && clexec_flag) | |
95732b49 | 1240 | { |
0001803f | 1241 | sd.dest = fd; |
95732b49 | 1242 | rd.dest = new_fd; |
0001803f | 1243 | new_redirect = make_redirection (sd, r_duplicating_output, rd, 0); |
3185942a JA |
1244 | new_redirect->flags |= RX_INTERNAL; |
1245 | ||
95732b49 | 1246 | add_exec_redirect (new_redirect); |
95732b49 JA |
1247 | } |
1248 | ||
cce855bc JA |
1249 | /* File descriptors used only for saving others should always be |
1250 | marked close-on-exec. Unfortunately, we have to preserve the | |
1251 | close-on-exec state of the file descriptor we are saving, since | |
1252 | fcntl (F_DUPFD) sets the new file descriptor to remain open | |
1253 | across execs. If, however, the file descriptor whose state we | |
1254 | are saving is <= 2, we can just set the close-on-exec flag, | |
1255 | because file descriptors 0-2 should always be open-on-exec, | |
1256 | and the restore above in do_redirection() will take care of it. */ | |
1257 | if (clexec_flag || fd < 3) | |
1258 | SET_CLOSE_ON_EXEC (new_fd); | |
3185942a JA |
1259 | else if (redirection_undo_list->flags & RX_SAVCLEXEC) |
1260 | SET_CLOSE_ON_EXEC (new_fd); | |
cce855bc JA |
1261 | |
1262 | return (0); | |
1263 | } | |
1264 | ||
1265 | /* Set up to close FD when we are finished with the current command | |
495aee44 CR |
1266 | and its redirections. Return 0 on success, -1 on error. */ |
1267 | static int | |
cce855bc JA |
1268 | add_undo_close_redirect (fd) |
1269 | int fd; | |
1270 | { | |
1271 | REDIRECT *closer; | |
0001803f | 1272 | REDIRECTEE sd; |
cce855bc | 1273 | |
0001803f | 1274 | sd.dest = fd; |
f73dda09 | 1275 | rd.dest = 0; |
0001803f | 1276 | closer = make_redirection (sd, r_close_this, rd, 0); |
95732b49 | 1277 | closer->flags |= RX_INTERNAL; |
cce855bc JA |
1278 | closer->next = redirection_undo_list; |
1279 | redirection_undo_list = closer; | |
495aee44 CR |
1280 | |
1281 | return 0; | |
cce855bc JA |
1282 | } |
1283 | ||
1284 | static void | |
1285 | add_exec_redirect (dummy_redirect) | |
1286 | REDIRECT *dummy_redirect; | |
1287 | { | |
1288 | dummy_redirect->next = exec_redirection_undo_list; | |
1289 | exec_redirection_undo_list = dummy_redirect; | |
1290 | } | |
1291 | ||
bb70624e JA |
1292 | /* Return 1 if the redirection specified by RI and REDIRECTOR alters the |
1293 | standard input. */ | |
1294 | static int | |
1295 | stdin_redirection (ri, redirector) | |
1296 | enum r_instruction ri; | |
1297 | int redirector; | |
1298 | { | |
1299 | switch (ri) | |
1300 | { | |
1301 | case r_input_direction: | |
1302 | case r_inputa_direction: | |
1303 | case r_input_output: | |
1304 | case r_reading_until: | |
1305 | case r_deblank_reading_until: | |
7117c2d2 | 1306 | case r_reading_string: |
bb70624e JA |
1307 | return (1); |
1308 | case r_duplicating_input: | |
1309 | case r_duplicating_input_word: | |
1310 | case r_close_this: | |
1311 | return (redirector == 0); | |
1312 | case r_output_direction: | |
1313 | case r_appending_to: | |
1314 | case r_duplicating_output: | |
1315 | case r_err_and_out: | |
3185942a | 1316 | case r_append_err_and_out: |
bb70624e JA |
1317 | case r_output_force: |
1318 | case r_duplicating_output_word: | |
1319 | return (0); | |
1320 | } | |
1321 | return (0); | |
1322 | } | |
1323 | ||
cce855bc JA |
1324 | /* Return non-zero if any of the redirections in REDIRS alter the standard |
1325 | input. */ | |
1326 | int | |
1327 | stdin_redirects (redirs) | |
1328 | REDIRECT *redirs; | |
1329 | { | |
1330 | REDIRECT *rp; | |
1331 | int n; | |
1332 | ||
1333 | for (n = 0, rp = redirs; rp; rp = rp->next) | |
0001803f CR |
1334 | if ((rp->rflags & REDIR_VARASSIGN) == 0) |
1335 | n += stdin_redirection (rp->instruction, rp->redirector.dest); | |
cce855bc JA |
1336 | return n; |
1337 | } | |
ac50fbac | 1338 | /* bind_var_to_int handles array references */ |
0001803f CR |
1339 | static int |
1340 | redir_varassign (redir, fd) | |
1341 | REDIRECT *redir; | |
1342 | int fd; | |
1343 | { | |
1344 | WORD_DESC *w; | |
1345 | SHELL_VAR *v; | |
1346 | ||
1347 | w = redir->redirector.filename; | |
1348 | v = bind_var_to_int (w->word, fd); | |
1349 | if (v == 0 || readonly_p (v) || noassign_p (v)) | |
1350 | return BADVAR_REDIRECT; | |
1351 | ||
ac50fbac | 1352 | stupidly_hack_special_variables (w->word); |
0001803f CR |
1353 | return 0; |
1354 | } | |
1355 | ||
ac50fbac | 1356 | /* Handles {array[ind]} for redirection words */ |
0001803f CR |
1357 | static int |
1358 | redir_varvalue (redir) | |
1359 | REDIRECT *redir; | |
1360 | { | |
1361 | SHELL_VAR *v; | |
ac50fbac | 1362 | char *val, *w; |
0001803f CR |
1363 | intmax_t vmax; |
1364 | int i; | |
ac50fbac CR |
1365 | #if defined (ARRAY_VARS) |
1366 | char *sub; | |
1367 | int len, vr; | |
1368 | #endif | |
0001803f | 1369 | |
ac50fbac | 1370 | w = redir->redirector.filename->word; /* shorthand */ |
0001803f | 1371 | /* XXX - handle set -u here? */ |
ac50fbac CR |
1372 | #if defined (ARRAY_VARS) |
1373 | if (vr = valid_array_reference (w)) | |
1374 | v = array_variable_part (w, &sub, &len); | |
1375 | else | |
1376 | #endif | |
1377 | v = find_variable (w); | |
0001803f CR |
1378 | if (v == 0 || invisible_p (v)) |
1379 | return -1; | |
1380 | ||
ac50fbac CR |
1381 | #if defined (ARRAY_VARS) |
1382 | /* get_variable_value handles references to array variables without | |
1383 | subscripts */ | |
1384 | if (vr && (array_p (v) || assoc_p (v))) | |
1385 | val = get_array_value (w, 0, (int *)NULL, (arrayind_t *)0); | |
1386 | else | |
1387 | #endif | |
0001803f CR |
1388 | val = get_variable_value (v); |
1389 | if (val == 0 || *val == 0) | |
1390 | return -1; | |
1391 | ||
1392 | if (legal_number (val, &vmax) < 0) | |
1393 | return -1; | |
1394 | ||
1395 | i = vmax; /* integer truncation */ | |
1396 | return i; | |
1397 | } |