6fa4125491
won't NUL terminate the string for us, and so we're liable to pick up trailing garbage, possibly tons of it. Pointed out by: obrien MFC after: 3 days
362 lines
8.6 KiB
C
362 lines
8.6 KiB
C
/*-
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1983, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)uudecode.c 8.2 (Berkeley) 4/2/94";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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/*
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* uudecode [file ...]
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*
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* create the specified file, decoding as you go.
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* used with uuencode.
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*/
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <netinet/in.h>
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#include <err.h>
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#include <pwd.h>
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#include <resolv.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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const char *filename;
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char *outfile;
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int cflag, iflag, oflag, pflag, sflag;
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static void usage(void);
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int decode(void);
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int decode2(int);
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void base64_decode(const char *);
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int rval, ch;
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while ((ch = getopt(argc, argv, "cio:ps")) != -1) {
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switch(ch) {
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case 'c':
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if (oflag)
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usage();
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cflag = 1; /* multiple uudecode'd files */
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break;
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case 'i':
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iflag = 1; /* ask before override files */
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break;
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case 'o':
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if (cflag || pflag || sflag)
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usage();
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oflag = 1; /* output to the specified file */
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sflag = 1; /* do not strip pathnames for output */
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outfile = optarg; /* set the output filename */
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break;
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case 'p':
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if (oflag)
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usage();
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pflag = 1; /* print output to stdout */
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break;
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case 's':
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if (oflag)
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usage();
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sflag = 1; /* do not strip pathnames for output */
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break;
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (*argv) {
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rval = 0;
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do {
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if (!freopen(filename = *argv, "r", stdin)) {
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warn("%s", *argv);
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rval = 1;
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continue;
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}
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rval |= decode();
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} while (*++argv);
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} else {
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filename = "stdin";
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rval = decode();
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}
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exit(rval);
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}
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int
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decode ()
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{
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int flag;
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/* decode only one file per input stream */
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if (!cflag)
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return(decode2(0));
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/* multiple uudecode'd files */
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for (flag = 0; ; flag++)
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if (decode2(flag))
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return(1);
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else if (feof(stdin))
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break;
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return(0);
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}
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int
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decode2(flag)
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int flag;
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{
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struct passwd *pw;
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register int n;
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register char ch, *p;
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int base64, ignore, n1;
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char buf[MAXPATHLEN+1];
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char buffn[MAXPATHLEN+1]; /* file name buffer */
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char *mode, *s;
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void *mode_handle;
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base64 = ignore = 0;
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/* search for header line */
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do {
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if (!fgets(buf, sizeof(buf), stdin)) {
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if (flag) /* no error */
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return(0);
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warnx("%s: no \"begin\" line", filename);
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return(1);
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}
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} while (strncmp(buf, "begin", 5) != 0);
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if (strncmp(buf, "begin-base64", 12) == 0)
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base64 = 1;
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/* Parse the header: begin{,-base64} mode outfile. */
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s = strtok(buf, " ");
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if (s == NULL)
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errx(1, "no mode or filename in input file");
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s = strtok(NULL, " ");
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if (s == NULL)
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errx(1, "no mode in input file");
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else {
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mode = strdup(s);
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if (mode == NULL)
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err(1, "strdup()");
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}
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if (!oflag) {
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outfile = strtok(NULL, "\r\n");
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if (outfile == NULL)
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errx(1, "no filename in input file");
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}
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if (strlcpy(buf, outfile, sizeof(buf)) >= sizeof(buf))
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errx(1, "%s: filename too long", outfile);
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if (!sflag && !pflag) {
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strlcpy(buffn, buf, sizeof(buffn));
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if (strrchr(buffn, '/') != NULL)
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strncpy(buf, strrchr(buffn, '/') + 1, sizeof(buf));
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if (buf[0] == '\0') {
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warnx("%s: illegal filename", buffn);
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return(1);
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}
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/* handle ~user/file format */
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if (buf[0] == '~') {
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if (!(p = index(buf, '/'))) {
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warnx("%s: illegal ~user", filename);
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return(1);
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}
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*p++ = '\0';
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if (!(pw = getpwnam(buf + 1))) {
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warnx("%s: no user %s", filename, buf);
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return(1);
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}
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n = strlen(pw->pw_dir);
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n1 = strlen(p);
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if (n + n1 + 2 > MAXPATHLEN) {
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warnx("%s: path too long", filename);
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return(1);
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}
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bcopy(p, buf + n + 1, n1 + 1);
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bcopy(pw->pw_dir, buf, n);
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buf[n] = '/';
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}
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}
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/* create output file, set mode */
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if (pflag)
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; /* print to stdout */
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else {
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mode_handle = setmode(mode);
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if (mode_handle == NULL)
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err(1, "setmode()");
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if (iflag && !access(buf, F_OK)) {
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(void)fprintf(stderr, "not overwritten: %s\n", buf);
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ignore++;
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} else if (!freopen(buf, "w", stdout) ||
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fchmod(fileno(stdout), getmode(mode_handle, 0) & 0666)) {
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warn("%s: %s", buf, filename);
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return(1);
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}
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free(mode_handle);
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free(mode);
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}
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strcpy(buffn, buf); /* store file name from header line */
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/* for each input line */
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next:
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for (;;) {
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if (!fgets(p = buf, sizeof(buf), stdin)) {
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warnx("%s: short file", filename);
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return(1);
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}
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if (base64) {
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if (strncmp(buf, "====", 4) == 0)
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return (0);
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base64_decode(buf);
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goto next;
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}
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#define DEC(c) (((c) - ' ') & 077) /* single character decode */
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#define IS_DEC(c) ( (((c) - ' ') >= 0) && (((c) - ' ') <= 077 + 1) )
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/* #define IS_DEC(c) (1) */
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#define OUT_OF_RANGE \
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{ \
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warnx( \
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"\n\tinput file: %s\n\tencoded file: %s\n\tcharacter out of range: [%d-%d]", \
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filename, buffn, 1 + ' ', 077 + ' ' + 1); \
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return(1); \
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}
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#define PUTCHAR(c) \
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if (!ignore) \
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putchar(c)
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/*
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* `n' is used to avoid writing out all the characters
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* at the end of the file.
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*/
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if ((n = DEC(*p)) <= 0)
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break;
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for (++p; n > 0; p += 4, n -= 3)
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if (n >= 3) {
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if (!(IS_DEC(*p) && IS_DEC(*(p + 1)) &&
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IS_DEC(*(p + 2)) && IS_DEC(*(p + 3))))
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OUT_OF_RANGE
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ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
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PUTCHAR(ch);
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ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
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PUTCHAR(ch);
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ch = DEC(p[2]) << 6 | DEC(p[3]);
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PUTCHAR(ch);
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}
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else {
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if (n >= 1) {
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if (!(IS_DEC(*p) && IS_DEC(*(p + 1))))
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OUT_OF_RANGE
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ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
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PUTCHAR(ch);
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}
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if (n >= 2) {
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if (!(IS_DEC(*(p + 1)) &&
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IS_DEC(*(p + 2))))
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OUT_OF_RANGE
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ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
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PUTCHAR(ch);
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}
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if (n >= 3) {
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if (!(IS_DEC(*(p + 2)) &&
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IS_DEC(*(p + 3))))
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OUT_OF_RANGE
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ch = DEC(p[2]) << 6 | DEC(p[3]);
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PUTCHAR(ch);
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}
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}
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}
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if (fgets(buf, sizeof(buf), stdin) == NULL ||
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(strcmp(buf, "end") && strcmp(buf, "end\n") &&
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strcmp(buf, "end\r\n"))) {
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warnx("%s: no \"end\" line", filename);
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return(1);
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}
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return(0);
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}
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void
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base64_decode(stream)
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const char *stream;
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{
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unsigned char out[MAXPATHLEN * 4];
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int rv;
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if (index(stream, '\r') != NULL)
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*index(stream, '\r') = '\0';
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if (index(stream, '\n') != NULL)
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*index(stream, '\n') = '\0';
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rv = b64_pton(stream, out, (sizeof(out) / sizeof(out[0])));
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if (rv == -1)
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errx(1, "b64_pton: error decoding base64 input stream");
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fwrite(out, 1, rv, stdout);
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}
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static void
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usage()
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{
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(void)fprintf(stderr, "usage: uudecode [-cips] [file ...]\n");
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(void)fprintf(stderr, "usage: uudecode [-i] -o output_file [file]\n");
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exit(1);
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}
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