1 /*-
2 * Copyright (c) 2007 Kai Wang
3 * Copyright (c) 2007 Tim Kientzle
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer
11 * in this position and unchanged.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include "archive_platform.h"
29 __FBSDID("$FreeBSD$");
30
31 #ifdef HAVE_ERRNO_H
32 #include <errno.h>
33 #endif
34 #ifdef HAVE_STDLIB_H
35 #include <stdlib.h>
36 #endif
37 #ifdef HAVE_STRING_H
38 #include <string.h>
39 #endif
40
41 #include "archive.h"
42 #include "archive_entry.h"
43 #include "archive_private.h"
44 #include "archive_write_private.h"
45
46 struct ar_w {
47 uint64_t entry_bytes_remaining;
48 uint64_t entry_padding;
49 int is_strtab;
50 int has_strtab;
51 char wrote_global_header;
52 char *strtab;
53 };
54
55 /*
56 * Define structure of the "ar" header.
57 */
58 #define AR_name_offset 0
59 #define AR_name_size 16
60 #define AR_date_offset 16
61 #define AR_date_size 12
62 #define AR_uid_offset 28
63 #define AR_uid_size 6
64 #define AR_gid_offset 34
65 #define AR_gid_size 6
66 #define AR_mode_offset 40
67 #define AR_mode_size 8
68 #define AR_size_offset 48
69 #define AR_size_size 10
70 #define AR_fmag_offset 58
71 #define AR_fmag_size 2
72
73 static int archive_write_set_format_ar(struct archive_write *);
74 static int archive_write_ar_header(struct archive_write *,
75 struct archive_entry *);
76 static ssize_t archive_write_ar_data(struct archive_write *,
77 const void *buff, size_t s);
78 static int archive_write_ar_free(struct archive_write *);
79 static int archive_write_ar_close(struct archive_write *);
80 static int archive_write_ar_finish_entry(struct archive_write *);
81 static const char *ar_basename(const char *path);
82 static int format_octal(int64_t v, char *p, int s);
83 static int format_decimal(int64_t v, char *p, int s);
84
85 int
archive_write_set_format_ar_bsd(struct archive * _a)86 archive_write_set_format_ar_bsd(struct archive *_a)
87 {
88 struct archive_write *a = (struct archive_write *)_a;
89 int r;
90
91 archive_check_magic(_a, ARCHIVE_WRITE_MAGIC,
92 ARCHIVE_STATE_NEW, "archive_write_set_format_ar_bsd");
93 r = archive_write_set_format_ar(a);
94 if (r == ARCHIVE_OK) {
95 a->archive.archive_format = ARCHIVE_FORMAT_AR_BSD;
96 a->archive.archive_format_name = "ar (BSD)";
97 }
98 return (r);
99 }
100
101 int
archive_write_set_format_ar_svr4(struct archive * _a)102 archive_write_set_format_ar_svr4(struct archive *_a)
103 {
104 struct archive_write *a = (struct archive_write *)_a;
105 int r;
106
107 archive_check_magic(_a, ARCHIVE_WRITE_MAGIC,
108 ARCHIVE_STATE_NEW, "archive_write_set_format_ar_svr4");
109 r = archive_write_set_format_ar(a);
110 if (r == ARCHIVE_OK) {
111 a->archive.archive_format = ARCHIVE_FORMAT_AR_GNU;
112 a->archive.archive_format_name = "ar (GNU/SVR4)";
113 }
114 return (r);
115 }
116
117 /*
118 * Generic initialization.
119 */
120 static int
archive_write_set_format_ar(struct archive_write * a)121 archive_write_set_format_ar(struct archive_write *a)
122 {
123 struct ar_w *ar;
124
125 /* If someone else was already registered, unregister them. */
126 if (a->format_free != NULL)
127 (a->format_free)(a);
128
129 ar = (struct ar_w *)malloc(sizeof(*ar));
130 if (ar == NULL) {
131 archive_set_error(&a->archive, ENOMEM, "Can't allocate ar data");
132 return (ARCHIVE_FATAL);
133 }
134 memset(ar, 0, sizeof(*ar));
135 a->format_data = ar;
136
137 a->format_name = "ar";
138 a->format_write_header = archive_write_ar_header;
139 a->format_write_data = archive_write_ar_data;
140 a->format_close = archive_write_ar_close;
141 a->format_free = archive_write_ar_free;
142 a->format_finish_entry = archive_write_ar_finish_entry;
143 return (ARCHIVE_OK);
144 }
145
146 static int
archive_write_ar_header(struct archive_write * a,struct archive_entry * entry)147 archive_write_ar_header(struct archive_write *a, struct archive_entry *entry)
148 {
149 int ret, append_fn;
150 char buff[60];
151 char *ss, *se;
152 struct ar_w *ar;
153 const char *pathname;
154 const char *filename;
155 int64_t size;
156
157 append_fn = 0;
158 ar = (struct ar_w *)a->format_data;
159 ar->is_strtab = 0;
160 filename = NULL;
161 size = archive_entry_size(entry);
162
163
164 /*
165 * Reject files with empty name.
166 */
167 pathname = archive_entry_pathname(entry);
168 if (pathname == NULL || *pathname == '\0') {
169 archive_set_error(&a->archive, EINVAL,
170 "Invalid filename");
171 return (ARCHIVE_WARN);
172 }
173
174 /*
175 * If we are now at the beginning of the archive,
176 * we need first write the ar global header.
177 */
178 if (!ar->wrote_global_header) {
179 __archive_write_output(a, "!<arch>\n", 8);
180 ar->wrote_global_header = 1;
181 }
182
183 memset(buff, ' ', 60);
184 strncpy(&buff[AR_fmag_offset], "`\n", 2);
185
186 if (strcmp(pathname, "/") == 0 ) {
187 /* Entry is archive symbol table in GNU format */
188 buff[AR_name_offset] = '/';
189 goto stat;
190 }
191 if (strcmp(pathname, "__.SYMDEF") == 0) {
192 /* Entry is archive symbol table in BSD format */
193 strncpy(buff + AR_name_offset, "__.SYMDEF", 9);
194 goto stat;
195 }
196 if (strcmp(pathname, "//") == 0) {
197 /*
198 * Entry is archive filename table, inform that we should
199 * collect strtab in next _data call.
200 */
201 ar->is_strtab = 1;
202 buff[AR_name_offset] = buff[AR_name_offset + 1] = '/';
203 /*
204 * For archive string table, only ar_size field should
205 * be set.
206 */
207 goto size;
208 }
209
210 /*
211 * Otherwise, entry is a normal archive member.
212 * Strip leading paths from filenames, if any.
213 */
214 if ((filename = ar_basename(pathname)) == NULL) {
215 /* Reject filenames with trailing "/" */
216 archive_set_error(&a->archive, EINVAL,
217 "Invalid filename");
218 return (ARCHIVE_WARN);
219 }
220
221 if (a->archive.archive_format == ARCHIVE_FORMAT_AR_GNU) {
222 /*
223 * SVR4/GNU variant use a "/" to mark then end of the filename,
224 * make it possible to have embedded spaces in the filename.
225 * So, the longest filename here (without extension) is
226 * actually 15 bytes.
227 */
228 if (strlen(filename) <= 15) {
229 strncpy(&buff[AR_name_offset],
230 filename, strlen(filename));
231 buff[AR_name_offset + strlen(filename)] = '/';
232 } else {
233 /*
234 * For filename longer than 15 bytes, GNU variant
235 * makes use of a string table and instead stores the
236 * offset of the real filename to in the ar_name field.
237 * The string table should have been written before.
238 */
239 if (ar->has_strtab <= 0) {
240 archive_set_error(&a->archive, EINVAL,
241 "Can't find string table");
242 return (ARCHIVE_WARN);
243 }
244
245 se = (char *)malloc(strlen(filename) + 3);
246 if (se == NULL) {
247 archive_set_error(&a->archive, ENOMEM,
248 "Can't allocate filename buffer");
249 return (ARCHIVE_FATAL);
250 }
251
252 strncpy(se, filename, strlen(filename));
253 strcpy(se + strlen(filename), "/\n");
254
255 ss = strstr(ar->strtab, se);
256 free(se);
257
258 if (ss == NULL) {
259 archive_set_error(&a->archive, EINVAL,
260 "Invalid string table");
261 return (ARCHIVE_WARN);
262 }
263
264 /*
265 * GNU variant puts "/" followed by digits into
266 * ar_name field. These digits indicates the real
267 * filename string's offset to the string table.
268 */
269 buff[AR_name_offset] = '/';
270 if (format_decimal(ss - ar->strtab,
271 buff + AR_name_offset + 1,
272 AR_name_size - 1)) {
273 archive_set_error(&a->archive, ERANGE,
274 "string table offset too large");
275 return (ARCHIVE_WARN);
276 }
277 }
278 } else if (a->archive.archive_format == ARCHIVE_FORMAT_AR_BSD) {
279 /*
280 * BSD variant: for any file name which is more than
281 * 16 chars or contains one or more embedded space(s), the
282 * string "#1/" followed by the ASCII length of the name is
283 * put into the ar_name field. The file size (stored in the
284 * ar_size field) is incremented by the length of the name.
285 * The name is then written immediately following the
286 * archive header.
287 */
288 if (strlen(filename) <= 16 && strchr(filename, ' ') == NULL) {
289 strncpy(&buff[AR_name_offset], filename, strlen(filename));
290 buff[AR_name_offset + strlen(filename)] = ' ';
291 }
292 else {
293 strncpy(buff + AR_name_offset, "#1/", 3);
294 if (format_decimal(strlen(filename),
295 buff + AR_name_offset + 3,
296 AR_name_size - 3)) {
297 archive_set_error(&a->archive, ERANGE,
298 "File name too long");
299 return (ARCHIVE_WARN);
300 }
301 append_fn = 1;
302 size += strlen(filename);
303 }
304 }
305
306 stat:
307 if (format_decimal(archive_entry_mtime(entry), buff + AR_date_offset, AR_date_size)) {
308 archive_set_error(&a->archive, ERANGE,
309 "File modification time too large");
310 return (ARCHIVE_WARN);
311 }
312 if (format_decimal(archive_entry_uid(entry), buff + AR_uid_offset, AR_uid_size)) {
313 archive_set_error(&a->archive, ERANGE,
314 "Numeric user ID too large");
315 return (ARCHIVE_WARN);
316 }
317 if (format_decimal(archive_entry_gid(entry), buff + AR_gid_offset, AR_gid_size)) {
318 archive_set_error(&a->archive, ERANGE,
319 "Numeric group ID too large");
320 return (ARCHIVE_WARN);
321 }
322 if (format_octal(archive_entry_mode(entry), buff + AR_mode_offset, AR_mode_size)) {
323 archive_set_error(&a->archive, ERANGE,
324 "Numeric mode too large");
325 return (ARCHIVE_WARN);
326 }
327 /*
328 * Sanity Check: A non-pseudo archive member should always be
329 * a regular file.
330 */
331 if (filename != NULL && archive_entry_filetype(entry) != AE_IFREG) {
332 archive_set_error(&a->archive, EINVAL,
333 "Regular file required for non-pseudo member");
334 return (ARCHIVE_WARN);
335 }
336
337 size:
338 if (format_decimal(size, buff + AR_size_offset, AR_size_size)) {
339 archive_set_error(&a->archive, ERANGE,
340 "File size out of range");
341 return (ARCHIVE_WARN);
342 }
343
344 ret = __archive_write_output(a, buff, 60);
345 if (ret != ARCHIVE_OK)
346 return (ret);
347
348 ar->entry_bytes_remaining = size;
349 ar->entry_padding = ar->entry_bytes_remaining % 2;
350
351 if (append_fn > 0) {
352 ret = __archive_write_output(a, filename, strlen(filename));
353 if (ret != ARCHIVE_OK)
354 return (ret);
355 ar->entry_bytes_remaining -= strlen(filename);
356 }
357
358 return (ARCHIVE_OK);
359 }
360
361 static ssize_t
archive_write_ar_data(struct archive_write * a,const void * buff,size_t s)362 archive_write_ar_data(struct archive_write *a, const void *buff, size_t s)
363 {
364 struct ar_w *ar;
365 int ret;
366
367 ar = (struct ar_w *)a->format_data;
368 if (s > ar->entry_bytes_remaining)
369 s = (size_t)ar->entry_bytes_remaining;
370
371 if (ar->is_strtab > 0) {
372 if (ar->has_strtab > 0) {
373 archive_set_error(&a->archive, EINVAL,
374 "More than one string tables exist");
375 return (ARCHIVE_WARN);
376 }
377
378 ar->strtab = (char *)malloc(s);
379 if (ar->strtab == NULL) {
380 archive_set_error(&a->archive, ENOMEM,
381 "Can't allocate strtab buffer");
382 return (ARCHIVE_FATAL);
383 }
384 strncpy(ar->strtab, buff, s);
385 ar->has_strtab = 1;
386 }
387
388 ret = __archive_write_output(a, buff, s);
389 if (ret != ARCHIVE_OK)
390 return (ret);
391
392 ar->entry_bytes_remaining -= s;
393 return (s);
394 }
395
396 static int
archive_write_ar_free(struct archive_write * a)397 archive_write_ar_free(struct archive_write *a)
398 {
399 struct ar_w *ar;
400
401 ar = (struct ar_w *)a->format_data;
402
403 if (ar == NULL)
404 return (ARCHIVE_OK);
405
406 if (ar->has_strtab > 0) {
407 free(ar->strtab);
408 ar->strtab = NULL;
409 }
410
411 free(ar);
412 a->format_data = NULL;
413 return (ARCHIVE_OK);
414 }
415
416 static int
archive_write_ar_close(struct archive_write * a)417 archive_write_ar_close(struct archive_write *a)
418 {
419 struct ar_w *ar;
420 int ret;
421
422 /*
423 * If we haven't written anything yet, we need to write
424 * the ar global header now to make it a valid ar archive.
425 */
426 ar = (struct ar_w *)a->format_data;
427 if (!ar->wrote_global_header) {
428 ar->wrote_global_header = 1;
429 ret = __archive_write_output(a, "!<arch>\n", 8);
430 return (ret);
431 }
432
433 return (ARCHIVE_OK);
434 }
435
436 static int
archive_write_ar_finish_entry(struct archive_write * a)437 archive_write_ar_finish_entry(struct archive_write *a)
438 {
439 struct ar_w *ar;
440 int ret;
441
442 ar = (struct ar_w *)a->format_data;
443
444 if (ar->entry_bytes_remaining != 0) {
445 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
446 "Entry remaining bytes larger than 0");
447 return (ARCHIVE_WARN);
448 }
449
450 if (ar->entry_padding == 0) {
451 return (ARCHIVE_OK);
452 }
453
454 if (ar->entry_padding != 1) {
455 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
456 "Padding wrong size: %ju should be 1 or 0",
457 (uintmax_t)ar->entry_padding);
458 return (ARCHIVE_WARN);
459 }
460
461 ret = __archive_write_output(a, "\n", 1);
462 return (ret);
463 }
464
465 /*
466 * Format a number into the specified field using base-8.
467 * NB: This version is slightly different from the one in
468 * _ustar.c
469 */
470 static int
format_octal(int64_t v,char * p,int s)471 format_octal(int64_t v, char *p, int s)
472 {
473 int len;
474 char *h;
475
476 len = s;
477 h = p;
478
479 /* Octal values can't be negative, so use 0. */
480 if (v < 0) {
481 while (len-- > 0)
482 *p++ = '0';
483 return (-1);
484 }
485
486 p += s; /* Start at the end and work backwards. */
487 do {
488 *--p = (char)('0' + (v & 7));
489 v >>= 3;
490 } while (--s > 0 && v > 0);
491
492 if (v == 0) {
493 memmove(h, p, len - s);
494 p = h + len - s;
495 while (s-- > 0)
496 *p++ = ' ';
497 return (0);
498 }
499 /* If it overflowed, fill field with max value. */
500 while (len-- > 0)
501 *p++ = '7';
502
503 return (-1);
504 }
505
506 /*
507 * Format a number into the specified field using base-10.
508 */
509 static int
format_decimal(int64_t v,char * p,int s)510 format_decimal(int64_t v, char *p, int s)
511 {
512 int len;
513 char *h;
514
515 len = s;
516 h = p;
517
518 /* Negative values in ar header are meaningless, so use 0. */
519 if (v < 0) {
520 while (len-- > 0)
521 *p++ = '0';
522 return (-1);
523 }
524
525 p += s;
526 do {
527 *--p = (char)('0' + (v % 10));
528 v /= 10;
529 } while (--s > 0 && v > 0);
530
531 if (v == 0) {
532 memmove(h, p, len - s);
533 p = h + len - s;
534 while (s-- > 0)
535 *p++ = ' ';
536 return (0);
537 }
538 /* If it overflowed, fill field with max value. */
539 while (len-- > 0)
540 *p++ = '9';
541
542 return (-1);
543 }
544
545 static const char *
ar_basename(const char * path)546 ar_basename(const char *path)
547 {
548 const char *endp, *startp;
549
550 endp = path + strlen(path) - 1;
551 /*
552 * For filename with trailing slash(es), we return
553 * NULL indicating an error.
554 */
555 if (*endp == '/')
556 return (NULL);
557
558 /* Find the start of the base */
559 startp = endp;
560 while (startp > path && *(startp - 1) != '/')
561 startp--;
562
563 return (startp);
564 }
565