uudecode.c revision 58666 
1/*-
2 * Copyright (c) 1983, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1983, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)uudecode.c	8.2 (Berkeley) 4/2/94";
43#endif
44static const char rcsid[] =
45  "$FreeBSD: head/usr.bin/uudecode/uudecode.c 58666 2000-03-27 11:49:36Z sheldonh $";
46#endif /* not lint */
47
48/*
49 * uudecode [file ...]
50 *
51 * create the specified file, decoding as you go.
52 * used with uuencode.
53 */
54#include <sys/param.h>
55#include <sys/stat.h>
56
57#include <err.h>
58#include <fnmatch.h>
59#include <pwd.h>
60#include <stdio.h>
61#include <stdlib.h>
62#include <string.h>
63#include <unistd.h>
64
65char *filename;
66int cflag, iflag, pflag, sflag;
67
68static void usage __P((void));
69int	decode __P((void));
70int	decode2 __P((int));
71
72int
73main(argc, argv)
74	int argc;
75	char *argv[];
76{
77	int rval, ch;
78
79	while ((ch = getopt(argc, argv, "cips")) != -1) {
80		switch(ch) {
81		case 'c':
82			cflag = 1; /* multiple uudecode'd files */
83			break;
84		case 'i':
85			iflag = 1; /* ask before override files */
86			break;
87		case 'p':
88			pflag = 1; /* print output to stdout */
89			break;
90		case 's':
91			sflag = 1; /* do not strip pathnames for output */
92			break;
93		default:
94			usage();
95		}
96	}
97        argc -= optind;
98        argv += optind;
99
100
101	if (*argv) {
102		rval = 0;
103		do {
104			if (!freopen(filename = *argv, "r", stdin)) {
105				warn("%s", *argv);
106				rval = 1;
107				continue;
108			}
109			rval |= decode();
110		} while (*++argv);
111	} else {
112		filename = "stdin";
113		rval = decode();
114	}
115	exit(rval);
116}
117
118int
119decode ()
120{
121	int flag;
122
123	/* decode only one file per input stream */
124	if (!cflag)
125		return(decode2(0));
126
127	/* multiple uudecode'd files */
128	for (flag = 0; ; flag++)
129		if (decode2(flag))
130			return(1);
131		else if (feof(stdin))
132			break;
133
134	return(0);
135}
136
137int
138decode2(flag)
139	int flag;
140{
141	struct passwd *pw;
142	register int n;
143	register char ch, first, *p;
144	int ignore, mode, n1;
145	char buf[MAXPATHLEN];
146	char buffn[MAXPATHLEN]; /* file name buffer */
147
148	ignore = 0;
149	/* search for header line */
150	do {
151		if (!fgets(buf, sizeof(buf), stdin)) {
152			if (flag) /* no error */
153				return(0);
154
155			warnx("%s: no \"begin\" line", filename);
156			return(1);
157		}
158	} while (strncmp(buf, "begin ", 6) ||
159		 fnmatch("begin [0-7]* *", buf, 0));
160
161	(void)sscanf(buf, "begin %o %[^\n\r]", &mode, buf);
162
163	if (!sflag && !pflag) {
164		strncpy(buffn, buf, sizeof(buffn));
165		if (strrchr(buffn, '/') != NULL)
166			strncpy(buf, strrchr(buffn, '/') + 1, sizeof(buf));
167		if (buf[0] == '\0') {
168			warnx("%s: illegal filename", buffn);
169			return(1);
170		}
171	}
172
173	/* handle ~user/file format */
174	if (buf[0] == '~') {
175		if (!(p = index(buf, '/'))) {
176			warnx("%s: illegal ~user", filename);
177			return(1);
178		}
179		*p++ = '\0';
180		if (!(pw = getpwnam(buf + 1))) {
181			warnx("%s: no user %s", filename, buf);
182			return(1);
183		}
184		n = strlen(pw->pw_dir);
185		n1 = strlen(p);
186		if (n + n1 + 2 > MAXPATHLEN) {
187			warnx("%s: path too long", filename);
188			return(1);
189		}
190		bcopy(p, buf + n + 1, n1 + 1);
191		bcopy(pw->pw_dir, buf, n);
192		buf[n] = '/';
193	}
194
195	/* create output file, set mode */
196	if (pflag)
197		; /* print to stdout */
198
199	else {
200		if (iflag && !access(buf, F_OK)) {
201			(void)fprintf(stderr, "not overwritten: %s\n", buf);
202			ignore++;
203		} else if (!freopen(buf, "w", stdout) ||
204		    fchmod(fileno(stdout), mode&0666)) {
205			warn("%s: %s", buf, filename);
206			return(1);
207		}
208	}
209	strcpy(buffn, buf); /* store file name from header line */
210
211	/* for each input line */
212	for (;;) {
213		if (!fgets(p = buf, sizeof(buf), stdin)) {
214			warnx("%s: short file", filename);
215			return(1);
216		}
217#define	DEC(c)	(((c) - ' ') & 077)		/* single character decode */
218#define IS_DEC(c) ( (((c) - ' ') >= 0) &&  (((c) - ' ') <= 077 + 1) )
219/* #define IS_DEC(c) (1) */
220
221#define OUT_OF_RANGE \
222{	\
223    warnx( \
224"\n\tinput file: %s\n\tencoded file: %s\n\tcharacter out of range: [%d-%d]", \
225 	filename, buffn, 1 + ' ', 077 + ' ' + 1); \
226        return(1); \
227}
228#define PUTCHAR(c) \
229if (!ignore) \
230	putchar(c)
231
232
233		/*
234		 * `n' is used to avoid writing out all the characters
235		 * at the end of the file.
236		 */
237		if ((n = DEC(*p)) <= 0)
238			break;
239		for (++p; n > 0; p += 4, n -= 3)
240			if (n >= 3) {
241				if (!(IS_DEC(*p) && IS_DEC(*(p + 1)) &&
242				     IS_DEC(*(p + 2)) && IS_DEC(*(p + 3))))
243                                	OUT_OF_RANGE
244
245				ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
246				PUTCHAR(ch);
247				ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
248				PUTCHAR(ch);
249				ch = DEC(p[2]) << 6 | DEC(p[3]);
250				PUTCHAR(ch);
251
252			}
253			else {
254				if (n >= 1) {
255					if (!(IS_DEC(*p) && IS_DEC(*(p + 1))))
256	                                	OUT_OF_RANGE
257					ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
258					PUTCHAR(ch);
259				}
260				if (n >= 2) {
261					if (!(IS_DEC(*(p + 1)) &&
262						IS_DEC(*(p + 2))))
263		                                OUT_OF_RANGE
264
265					ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
266					PUTCHAR(ch);
267				}
268				if (n >= 3) {
269					if (!(IS_DEC(*(p + 2)) &&
270						IS_DEC(*(p + 3))))
271		                                OUT_OF_RANGE
272					ch = DEC(p[2]) << 6 | DEC(p[3]);
273					PUTCHAR(ch);
274				}
275			}
276	}
277	if (fgets(buf, sizeof(buf), stdin) == NULL ||
278	    (strcmp(buf, "end") && strcmp(buf, "end\n") &&
279	     strcmp(buf, "end\r\n"))) {
280		warnx("%s: no \"end\" line", filename);
281		return(1);
282	}
283	return(0);
284}
285
286static void
287usage()
288{
289	(void)fprintf(stderr, "usage: uudecode [-cips] [file ...]\n");
290	exit(1);
291}
292