2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * @(#) Copyright (c) 1983, 1993 The Regents of the University of California. All rights reserved.
30 * @(#)uudecode.c 8.2 (Berkeley) 4/2/94
31 * $FreeBSD: src/usr.bin/uudecode/uudecode.c,v 1.13.2.6 2003/04/07 20:10:33 fanf Exp $
37 * create the specified file, decoding as you go.
40 #include <sys/param.h>
41 #include <sys/socket.h>
44 #include <netinet/in.h>
57 static const char *infile, *outfile;
58 static FILE *infp, *outfp;
59 static int base64, cflag, iflag, oflag, pflag, rflag, sflag;
61 static void usage(void);
62 static int decode(void);
63 static int decode2(void);
64 static int uu_decode(void);
65 static int base64_decode(void);
68 main(int argc, char *argv[])
72 if (strcmp(basename(argv[0]), "b64decode") == 0)
75 while ((ch = getopt(argc, argv, "cimo:prs")) != -1) {
80 cflag = 1; /* multiple uudecode'd files */
83 iflag = 1; /* ask before override files */
89 if (cflag || pflag || rflag || sflag)
91 oflag = 1; /* output to the specified file */
92 sflag = 1; /* do not strip pathnames for output */
93 outfile = optarg; /* set the output filename */
98 pflag = 1; /* print output to stdout */
103 rflag = 1; /* decode raw data */
108 sflag = 1; /* do not strip pathnames for output */
120 infp = fopen(infile = *argv, "r");
143 /* relaxed alternative to decode2() */
144 outfile = "/dev/stdout";
147 return (base64_decode());
149 return (uu_decode());
153 warnx("%s: missing or bad \"begin\" line", infile);
156 for (r = v; cflag; r |= v) {
174 char buf[MAXPATHLEN + 1];
177 /* search for header line */
179 if (fgets(buf, sizeof(buf), infp) == NULL)
182 if (strncmp(p, "begin-base64 ", 13) == 0) {
185 } else if (strncmp(p, "begin ", 6) == 0)
189 /* p points to mode */
194 /* q points to filename */
196 while (n > 0 && (q[n-1] == '\n' || q[n-1] == '\r'))
198 /* found valid header? */
204 if ((handle = setmode(p)) == NULL) {
206 warnx("invalid file mode: %s", infile);
208 warn("setmode malloc failed: %s", infile);
213 mode = getmode(handle, 0) & 0666;
217 /* don't strip, so try ~user/file expansion */
224 pw = getpwnam(q + 1);
228 n = strlen(pw->pw_dir);
232 if (sizeof(buf) < n + m) {
233 warnx("%s: bad output filename",
237 p = memmove(buf + n, p, m);
239 q = memcpy(p - n, pw->pw_dir, n);
242 /* strip down to leaf name */
250 /* POSIX says "/dev/stdout" is a 'magic cookie' not a special file. */
251 if (pflag || strcmp(outfile, "/dev/stdout") == 0)
254 flags = O_WRONLY | O_CREAT | O_EXCL;
255 if (lstat(outfile, &st) == 0) {
257 warnc(EEXIST, "%s: %s", infile, outfile);
260 switch (st.st_mode & S_IFMT) {
263 /* avoid symlink attacks */
264 if (unlink(outfile) == 0 || errno == ENOENT)
266 warn("%s: unlink %s", infile, outfile);
269 warnc(EISDIR, "%s: %s", infile, outfile);
273 /* trust command-line names */
277 warnc(EEXIST, "%s: %s", infile, outfile);
280 } else if (errno != ENOENT) {
281 warn("%s: %s", infile, outfile);
284 if ((fd = open(outfile, flags, mode)) < 0 ||
285 (outfp = fdopen(fd, "w")) == NULL) {
286 warn("%s: %s", infile, outfile);
292 return (base64_decode());
294 return (uu_decode());
298 get_line(char *buf, size_t size)
300 if (fgets(buf, size, infp) != NULL)
304 warnx("%s: %s: short file", infile, outfile);
309 checkend(const char *ptr, const char *end, const char *msg)
314 if (strncmp(ptr, end, n) != 0 ||
315 strspn(ptr + n, " \t\r\n") != strlen(ptr + n)) {
316 warnx("%s: %s: %s", infile, outfile, msg);
319 if (fclose(outfp) != 0) {
320 warn("%s: %s", infile, outfile);
331 char buf[MAXPATHLEN+1];
333 /* for each input line */
335 switch (get_line(buf, sizeof(buf))) {
342 #define DEC(c) (((c) - ' ') & 077) /* single character decode */
343 #define IS_DEC(c) ( (((c) - ' ') >= 0) && (((c) - ' ') <= 077 + 1) )
345 #define OUT_OF_RANGE do { \
346 warnx("%s: %s: character out of range: [%d-%d]", \
347 infile, outfile, 1 + ' ', 077 + ' ' + 1); \
352 * `i' is used to avoid writing out all the characters
353 * at the end of the file.
356 if ((i = DEC(*p)) <= 0)
358 for (++p; i > 0; p += 4, i -= 3)
360 if (!(IS_DEC(*p) && IS_DEC(*(p + 1)) &&
361 IS_DEC(*(p + 2)) && IS_DEC(*(p + 3))))
364 ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
366 ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
368 ch = DEC(p[2]) << 6 | DEC(p[3]);
372 if (!(IS_DEC(*p) && IS_DEC(*(p + 1))))
374 ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
378 if (!(IS_DEC(*(p + 1)) &&
382 ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
386 if (!(IS_DEC(*(p + 2)) &&
389 ch = DEC(p[2]) << 6 | DEC(p[3]);
394 switch (get_line(buf, sizeof(buf))) {
400 return (checkend(buf, "end", "no \"end\" line"));
408 char inbuf[MAXPATHLEN + 1];
409 unsigned char outbuf[MAXPATHLEN * 4];
412 switch (get_line(inbuf, sizeof(inbuf))) {
419 n = b64_pton(inbuf, outbuf, sizeof(outbuf));
423 fwrite(outbuf, 1, n, outfp);
425 return (checkend(inbuf, "====",
426 "error decoding base64 input stream"));
432 (void)fprintf(stderr,
433 "usage: uudecode [-cimprs] [file ...]\n"
434 " uudecode [-i] -o output_file [file]\n"
435 " b64decode [-cimprs] [file ...]\n"
436 " b64decode [-i] -o output_file [file]\n");