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/* $OpenBSD: uudecode.c,v 1.11 2003/06/10 22:20:53 deraadt Exp $ */
/* $NetBSD: uudecode.c,v 1.6 1994/11/17 07:40:43 jtc Exp $ */
/*-
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
char copyright[] =
"@(#) Copyright (c) 1983, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#ifndef lint
#if 0
static char sccsid[] = "@(#)uudecode.c 8.2 (Berkeley) 4/2/94";
#endif
static char rcsid[] = "$OpenBSD: uudecode.c,v 1.11 2003/06/10 22:20:53 deraadt Exp $";
#endif /* not lint */
/*
* uudecode [-p] [file ...]
*
* create the specified file, decoding as you go.
* used with uuencode.
*
* Write to stdout if '-p' is specified. Use this option if you care about
* security at all.
*/
#include <stdio.h>
#include <string.h>
#include <locale.h>
#include <errno.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <pwd.h>
#include <unistd.h>
static int decode(int);
static void usage(void);
char *filename;
int
main(int argc, char *argv[])
{
int rval;
int ch;
int tostdout = 0;
setlocale(LC_ALL, "");
while ((ch = getopt(argc, argv, "p")) != -1)
switch((char)ch) {
case 'p':
tostdout++;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (*argv) {
rval = 0;
do {
if (!freopen(filename = *argv, "r", stdin)) {
(void)fprintf(stderr, "uudecode: %s: %s\n",
*argv, strerror(errno));
rval = 1;
continue;
}
rval |= decode(tostdout);
} while (*++argv);
} else {
filename = "stdin";
rval = decode(tostdout);
}
exit(rval);
}
static int
decode(int tostdout)
{
struct passwd *pw;
int n;
char ch, *p;
int mode, n1;
char buf[MAXPATHLEN];
/* search for header line */
do {
if (!fgets(buf, sizeof(buf), stdin)) {
(void)fprintf(stderr,
"uudecode: %s: no \"begin\" line\n", filename);
return(1);
}
} while (strncmp(buf, "begin ", 6));
(void)sscanf(buf, "begin %o %1023[^\n\r]", &mode, buf);
/* handle ~user/file format */
if (buf[0] == '~') {
if (!(p = strchr(buf, '/'))) {
(void)fprintf(stderr, "uudecode: %s: illegal ~user.\n",
filename);
return(1);
}
*p++ = NULL;
if (!(pw = getpwnam(buf + 1))) {
(void)fprintf(stderr, "uudecode: %s: no user %s.\n",
filename, buf);
return(1);
}
n = strlen(pw->pw_dir);
n1 = strlen(p);
if (n + n1 + 2 > MAXPATHLEN) {
(void)fprintf(stderr, "uudecode: %s: path too long.\n",
filename);
return(1);
}
bcopy(p, buf + n + 1, n1 + 1);
bcopy(pw->pw_dir, buf, n);
buf[n] = '/';
}
if (!tostdout) {
/* create output file, set mode */
if (!freopen(buf, "w", stdout) ||
fchmod(fileno(stdout), mode&0666)) {
(void)fprintf(stderr, "uudecode: %s: %s: %s\n", buf,
filename, strerror(errno));
return(1);
}
}
/* for each input line */
for (;;) {
if (!fgets(p = buf, sizeof(buf), stdin)) {
(void)fprintf(stderr, "uudecode: %s: short file.\n",
filename);
return(1);
}
#define DEC(c) (((c) - ' ') & 077) /* single character decode */
/*
* `n' is used to avoid writing out all the characters
* at the end of the file.
*/
if ((n = DEC(*p)) <= 0)
break;
for (++p; n > 0; p += 4, n -= 3)
if (n >= 3) {
ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
putchar(ch);
ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
putchar(ch);
ch = DEC(p[2]) << 6 | DEC(p[3]);
putchar(ch);
}
else {
if (n >= 1) {
ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
putchar(ch);
}
if (n >= 2) {
ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
putchar(ch);
}
if (n >= 3) {
ch = DEC(p[2]) << 6 | DEC(p[3]);
putchar(ch);
}
}
}
if (!fgets(buf, sizeof(buf), stdin) || strcmp(buf, "end\n")) {
(void)fprintf(stderr, "uudecode: %s: no \"end\" line.\n",
filename);
return(1);
}
return(0);
}
static void
usage(void)
{
(void)fprintf(stderr, "usage: uudecode [-p] [file ...]\n");
exit(1);
}
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