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1/* uudecode.c -- uudecode utility.
2 * Copyright (C) 1994, 1995 Free Software Foundation, Inc.
3 *
4 * This product is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2, or (at your option)
7 * any later version.
8 *
9 * This product is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this product; see the file COPYING. If not, write to
16 * the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
17 * 02111-1307, USA.
18 *
19 * Reworked to GNU style by Ian Lance Taylor, ian@airs.com, August 93.
20 *
21 * Original copyright notice is retained at the end of this file.
22 */
23
24
25
26#include <stdio.h>
27#include <errno.h>
28#include <getopt.h>
29#include <string.h>
30#include <stdlib.h>
31#include "busybox.h"
32#include "pwd_grp/pwd.h"
33#include "pwd_grp/grp.h"
34
35/*struct passwd *getpwnam();*/
36
37/* Single character decode. */
38#define DEC(Char) (((Char) - ' ') & 077)
39
40static int read_stduu (const char *inname)
41{
42 char buf[2 * BUFSIZ];
43
44 while (1) {
45 int n;
46 char *p;
47
48 if (fgets (buf, sizeof(buf), stdin) == NULL) {
49 error_msg("%s: Short file", inname);
50 return FALSE;
51 }
52 p = buf;
53
54 /* N is used to avoid writing out all the characters at the end of
55 the file. */
56 n = DEC (*p);
57 if (n <= 0)
58 break;
59 for (++p; n > 0; p += 4, n -= 3) {
60 char ch;
61
62 if (n >= 3) {
63 ch = DEC (p[0]) << 2 | DEC (p[1]) >> 4;
64 putchar (ch);
65 ch = DEC (p[1]) << 4 | DEC (p[2]) >> 2;
66 putchar (ch);
67 ch = DEC (p[2]) << 6 | DEC (p[3]);
68 putchar (ch);
69 } else {
70 if (n >= 1) {
71 ch = DEC (p[0]) << 2 | DEC (p[1]) >> 4;
72 putchar (ch);
73 }
74 if (n >= 2) {
75 ch = DEC (p[1]) << 4 | DEC (p[2]) >> 2;
76 putchar (ch);
77 }
78 }
79 }
80 }
81
82 if (fgets (buf, sizeof(buf), stdin) == NULL
83 || strcmp (buf, "end\n")) {
84 error_msg("%s: No `end' line", inname);
85 return FALSE;
86 }
87
88 return TRUE;
89}
90
91static int read_base64 (const char *inname)
92{
93 static const char b64_tab[256] = {
94 '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*000-007*/
95 '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*010-017*/
96 '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*020-027*/
97 '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*030-037*/
98 '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*040-047*/
99 '\177', '\177', '\177', '\76', '\177', '\177', '\177', '\77', /*050-057*/
100 '\64', '\65', '\66', '\67', '\70', '\71', '\72', '\73', /*060-067*/
101 '\74', '\75', '\177', '\177', '\177', '\100', '\177', '\177', /*070-077*/
102 '\177', '\0', '\1', '\2', '\3', '\4', '\5', '\6', /*100-107*/
103 '\7', '\10', '\11', '\12', '\13', '\14', '\15', '\16', /*110-117*/
104 '\17', '\20', '\21', '\22', '\23', '\24', '\25', '\26', /*120-127*/
105 '\27', '\30', '\31', '\177', '\177', '\177', '\177', '\177', /*130-137*/
106 '\177', '\32', '\33', '\34', '\35', '\36', '\37', '\40', /*140-147*/
107 '\41', '\42', '\43', '\44', '\45', '\46', '\47', '\50', /*150-157*/
108 '\51', '\52', '\53', '\54', '\55', '\56', '\57', '\60', /*160-167*/
109 '\61', '\62', '\63', '\177', '\177', '\177', '\177', '\177', /*170-177*/
110 '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*200-207*/
111 '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*210-217*/
112 '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*220-227*/
113 '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*230-237*/
114 '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*240-247*/
115 '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*250-257*/
116 '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*260-267*/
117 '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*270-277*/
118 '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*300-307*/
119 '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*310-317*/
120 '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*320-327*/
121 '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*330-337*/
122 '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*340-347*/
123 '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*350-357*/
124 '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*360-367*/
125 '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*370-377*/
126 };
127 unsigned char buf[2 * BUFSIZ];
128
129 while (1) {
130 int last_data = 0;
131 unsigned char *p;
132
133 if (fgets (buf, sizeof(buf), stdin) == NULL) {
134 error_msg("%s: Short file", inname);
135 return FALSE;
136 }
137 p = buf;
138
139 if (memcmp (buf, "====", 4) == 0)
140 break;
141 if (last_data != 0) {
142 error_msg("%s: data following `=' padding character", inname);
143 return FALSE;
144 }
145
146 /* The following implementation of the base64 decoding might look
147 a bit clumsy but I only try to follow the POSIX standard:
148 ``All line breaks or other characters not found in the table
149 [with base64 characters] shall be ignored by decoding
150 software.'' */
151 while (*p != '\n') {
152 char c1, c2, c3;
153
154 while ((b64_tab[*p] & '\100') != 0)
155 if (*p == '\n' || *p++ == '=')
156 break;
157 if (*p == '\n')
158 /* This leaves the loop. */
159 continue;
160 c1 = b64_tab[*p++];
161
162 while ((b64_tab[*p] & '\100') != 0)
163 if (*p == '\n' || *p++ == '=') {
164 error_msg("%s: illegal line", inname);
165 return FALSE;
166 }
167 c2 = b64_tab[*p++];
168
169 while (b64_tab[*p] == '\177')
170 if (*p++ == '\n') {
171 error_msg("%s: illegal line", inname);
172 return FALSE;
173 }
174 if (*p == '=') {
175 putchar (c1 << 2 | c2 >> 4);
176 last_data = 1;
177 break;
178 }
179 c3 = b64_tab[*p++];
180
181 while (b64_tab[*p] == '\177')
182 if (*p++ == '\n') {
183 error_msg("%s: illegal line", inname);
184 return FALSE;
185 }
186 putchar (c1 << 2 | c2 >> 4);
187 putchar (c2 << 4 | c3 >> 2);
188 if (*p == '=') {
189 last_data = 1;
190 break;
191 }
192 else
193 putchar (c3 << 6 | b64_tab[*p++]);
194 }
195 }
196
197 return TRUE;
198}
199
200static int decode (const char *inname,
201 const char *forced_outname)
202{
203 struct passwd *pw;
204 register char *p;
205 int mode;
206 char buf[2 * BUFSIZ];
207 char *outname;
208 int do_base64 = 0;
209 int res;
210 int dofre;
211
212 /* Search for header line. */
213
214 while (1) {
215 if (fgets (buf, sizeof (buf), stdin) == NULL) {
216 error_msg("%s: No `begin' line", inname);
217 return FALSE;
218 }
219
220 if (strncmp (buf, "begin", 5) == 0) {
221 if (sscanf (buf, "begin-base64 %o %s", &mode, buf) == 2) {
222 do_base64 = 1;
223 break;
224 } else if (sscanf (buf, "begin %o %s", &mode, buf) == 2)
225 break;
226 }
227 }
228
229 /* If the output file name is given on the command line this rules. */
230 dofre = FALSE;
231 if (forced_outname != NULL)
232 outname = (char *) forced_outname;
233 else {
234 /* Handle ~user/file format. */
235 if (buf[0] != '~')
236 outname = buf;
237 else {
238 p = buf + 1;
239 while (*p != '/')
240 ++p;
241 if (*p == '\0') {
242 error_msg("%s: Illegal ~user", inname);
243 return FALSE;
244 }
245 *p++ = '\0';
246 pw = getpwnam (buf + 1);
247 if (pw == NULL) {
248 error_msg("%s: No user `%s'", inname, buf + 1);
249 return FALSE;
250 }
251 outname = concat_path_file(pw->pw_dir, p);
252 dofre = TRUE;
253 }
254 }
255
256 /* Create output file and set mode. */
257 if (strcmp (outname, "/dev/stdout") != 0 && strcmp (outname, "-") != 0
258 && (freopen (outname, "w", stdout) == NULL
259 || chmod (outname, mode & (S_IRWXU | S_IRWXG | S_IRWXO))
260 )) {
261 perror_msg("%s", outname); /* */
262 if (dofre)
263 free(outname);
264 return FALSE;
265 }
266
267 /* We differenciate decoding standard UU encoding and base64. A
268 common function would only slow down the program. */
269
270 /* For each input line: */
271 if (do_base64)
272 res = read_base64 (inname);
273 else
274 res = read_stduu (inname);
275 if (dofre)
276 free(outname);
277 return res;
278}
279
280int uudecode_main (int argc,
281 char **argv)
282{
283 int opt;
284 int exit_status;
285 const char *outname;
286 outname = NULL;
287
288 while ((opt = getopt(argc, argv, "o:")) != EOF) {
289 switch (opt) {
290 case 0:
291 break;
292
293 case 'o':
294 outname = optarg;
295 break;
296
297 default:
298 show_usage();
299 }
300 }
301
302 if (optind == argc)
303 exit_status = decode ("stdin", outname) == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
304 else {
305 exit_status = EXIT_SUCCESS;
306 do {
307 if (freopen (argv[optind], "r", stdin) != NULL) {
308 if (decode (argv[optind], outname) != 0)
309 exit_status = FALSE;
310 } else {
311 perror_msg("%s", argv[optind]);
312 exit_status = EXIT_FAILURE;
313 }
314 optind++;
315 }
316 while (optind < argc);
317 }
318 return(exit_status);
319}
320
321/* Copyright (c) 1983 Regents of the University of California.
322 * All rights reserved.
323 *
324 * Redistribution and use in source and binary forms, with or without
325 * modification, are permitted provided that the following conditions
326 * are met:
327 * 1. Redistributions of source code must retain the above copyright
328 * notice, this list of conditions and the following disclaimer.
329 * 2. Redistributions in binary form must reproduce the above copyright
330 * notice, this list of conditions and the following disclaimer in the
331 * documentation and/or other materials provided with the distribution.
332 *
333 * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
334 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
335 *
336 * 4. Neither the name of the University nor the names of its contributors
337 * may be used to endorse or promote products derived from this software
338 * without specific prior written permission.
339 *
340 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
341 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
342 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
343 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
344 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
345 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
346 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
347 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
348 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
349 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
350 * SUCH DAMAGE.
351 */
352
353
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