c1d0f70dee
Different code that processes the input in similar ways should be called in similar ways. File-local stuff should be static. Output errors should be checked for. Diffs sometimes have to be big.
406 lines
9.2 KiB
C
406 lines
9.2 KiB
C
/*-
|
|
* 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. 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.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static const char copyright[] =
|
|
"@(#) Copyright (c) 1983, 1993\n\
|
|
The Regents of the University of California. All rights reserved.\n";
|
|
#endif /* not lint */
|
|
|
|
#if 0
|
|
#ifndef lint
|
|
static char sccsid[] = "@(#)uudecode.c 8.2 (Berkeley) 4/2/94";
|
|
#endif /* not lint */
|
|
#endif
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
/*
|
|
* uudecode [file ...]
|
|
*
|
|
* create the specified file, decoding as you go.
|
|
* used with uuencode.
|
|
*/
|
|
#include <sys/param.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include <netinet/in.h>
|
|
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <pwd.h>
|
|
#include <resolv.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
static const char *infile, *outfile;
|
|
static FILE *infp, *outfp;
|
|
static int cflag, iflag, oflag, pflag, sflag;
|
|
|
|
static void usage(void);
|
|
static int decode(void);
|
|
static int decode2(void);
|
|
static int uu_decode(void);
|
|
static int base64_decode(void);
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
int rval, ch;
|
|
|
|
while ((ch = getopt(argc, argv, "cio:ps")) != -1) {
|
|
switch(ch) {
|
|
case 'c':
|
|
if (oflag)
|
|
usage();
|
|
cflag = 1; /* multiple uudecode'd files */
|
|
break;
|
|
case 'i':
|
|
iflag = 1; /* ask before override files */
|
|
break;
|
|
case 'o':
|
|
if (cflag || pflag || sflag)
|
|
usage();
|
|
oflag = 1; /* output to the specified file */
|
|
sflag = 1; /* do not strip pathnames for output */
|
|
outfile = optarg; /* set the output filename */
|
|
break;
|
|
case 'p':
|
|
if (oflag)
|
|
usage();
|
|
pflag = 1; /* print output to stdout */
|
|
break;
|
|
case 's':
|
|
if (oflag)
|
|
usage();
|
|
sflag = 1; /* do not strip pathnames for output */
|
|
break;
|
|
default:
|
|
usage();
|
|
}
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
if (*argv) {
|
|
rval = 0;
|
|
do {
|
|
infp = fopen(infile = *argv, "r");
|
|
if (infp == NULL) {
|
|
warn("%s", *argv);
|
|
rval = 1;
|
|
continue;
|
|
}
|
|
rval |= decode();
|
|
fclose(infp);
|
|
} while (*++argv);
|
|
} else {
|
|
infile = "stdin";
|
|
infp = stdin;
|
|
rval = decode();
|
|
}
|
|
exit(rval);
|
|
}
|
|
|
|
static int
|
|
decode(void)
|
|
{
|
|
int r, v;
|
|
|
|
v = decode2();
|
|
if (v == EOF) {
|
|
warnx("%s: missing or bad \"begin\" line", infile);
|
|
return (1);
|
|
}
|
|
for (r = v; cflag; r |= v) {
|
|
v = decode2();
|
|
if (v == EOF)
|
|
break;
|
|
}
|
|
return (r);
|
|
}
|
|
|
|
static int
|
|
decode2(void)
|
|
{
|
|
int base64, flags, fd, mode;
|
|
size_t n, m;
|
|
char *p, *q;
|
|
void *handle;
|
|
struct passwd *pw;
|
|
struct stat st;
|
|
char buf[MAXPATHLEN+1];
|
|
|
|
base64 = 0;
|
|
/* search for header line */
|
|
for (;;) {
|
|
if (fgets(buf, sizeof(buf), infp) == NULL)
|
|
return (EOF);
|
|
p = buf;
|
|
if (strncmp(p, "begin-base64 ", 13) == 0) {
|
|
base64 = 1;
|
|
p += 13;
|
|
} else if (strncmp(p, "begin ", 6) == 0)
|
|
p += 6;
|
|
else
|
|
continue;
|
|
/* p points to mode */
|
|
q = strchr(p, ' ');
|
|
if (q == NULL)
|
|
continue;
|
|
*q++ = '\0';
|
|
/* q points to filename */
|
|
n = strlen(q);
|
|
while (n > 0 && (q[n-1] == '\n' || q[n-1] == '\r'))
|
|
q[--n] = '\0';
|
|
/* found valid header? */
|
|
if (n > 0)
|
|
break;
|
|
}
|
|
|
|
handle = setmode(p);
|
|
if (handle == NULL) {
|
|
warnx("%s: unable to parse file mode", infile);
|
|
return (1);
|
|
}
|
|
mode = getmode(handle, 0) & 0666;
|
|
free(handle);
|
|
|
|
if (sflag) {
|
|
/* don't strip, so try ~user/file expansion */
|
|
p = NULL;
|
|
pw = NULL;
|
|
if (*q == '~')
|
|
p = strchr(q, '/');
|
|
if (p != NULL) {
|
|
*p = '\0';
|
|
pw = getpwnam(q + 1);
|
|
*p = '/';
|
|
}
|
|
if (pw != NULL) {
|
|
n = strlen(pw->pw_dir);
|
|
if (buf + n > p) {
|
|
/* make room */
|
|
m = strlen(p);
|
|
if (sizeof(buf) < n + m) {
|
|
warnx("%s: bad output filename",
|
|
infile);
|
|
return (1);
|
|
}
|
|
p = memmove(buf + n, p, m);
|
|
}
|
|
q = memcpy(p - n, pw->pw_dir, n);
|
|
}
|
|
} else {
|
|
/* strip down to leaf name */
|
|
p = strrchr(q, '/');
|
|
if (p != NULL)
|
|
q = p + 1;
|
|
}
|
|
if (!oflag)
|
|
outfile = q;
|
|
|
|
if (pflag)
|
|
outfp = stdout;
|
|
else {
|
|
flags = O_WRONLY|O_CREAT|O_EXCL;
|
|
if (lstat(outfile, &st) == 0) {
|
|
if (iflag) {
|
|
warnc(EEXIST, "%s: %s", infile, outfile);
|
|
return (0);
|
|
}
|
|
switch (st.st_mode & S_IFMT) {
|
|
case S_IFREG:
|
|
case S_IFLNK:
|
|
/* avoid symlink attacks */
|
|
if (unlink(outfile) == 0 || errno == ENOENT)
|
|
break;
|
|
warn("%s: unlink %s", infile, outfile);
|
|
return (1);
|
|
case S_IFDIR:
|
|
warnc(EISDIR, "%s: %s", infile, outfile);
|
|
return (1);
|
|
default:
|
|
if (oflag) {
|
|
/* trust command-line names */
|
|
flags &= ~O_EXCL;
|
|
break;
|
|
}
|
|
warnc(EEXIST, "%s: %s", infile, outfile);
|
|
return (1);
|
|
}
|
|
} else if (errno != ENOENT) {
|
|
warn("%s: %s", infile, outfile);
|
|
return (1);
|
|
}
|
|
if ((fd = open(outfile, flags, mode)) < 0 ||
|
|
(outfp = fdopen(fd, "w")) == NULL) {
|
|
warn("%s: %s", infile, outfile);
|
|
return (1);
|
|
}
|
|
}
|
|
|
|
if (base64)
|
|
return (base64_decode());
|
|
else
|
|
return (uu_decode());
|
|
}
|
|
|
|
static int
|
|
uu_decode(void)
|
|
{
|
|
int i, ch;
|
|
char *p;
|
|
char buf[MAXPATHLEN+1];
|
|
|
|
/* for each input line */
|
|
for (;;) {
|
|
if (fgets(p = buf, sizeof(buf), infp) == NULL) {
|
|
warnx("%s: short file", infile);
|
|
return (1);
|
|
}
|
|
|
|
#define DEC(c) (((c) - ' ') & 077) /* single character decode */
|
|
#define IS_DEC(c) ( (((c) - ' ') >= 0) && (((c) - ' ') <= 077 + 1) )
|
|
|
|
#define OUT_OF_RANGE do { \
|
|
warnx("%s: %s: character out of range: [%d-%d]", \
|
|
infile, outfile, 1 + ' ', 077 + ' ' + 1); \
|
|
return (1); \
|
|
} while (0)
|
|
|
|
/*
|
|
* `i' is used to avoid writing out all the characters
|
|
* at the end of the file.
|
|
*/
|
|
if ((i = DEC(*p)) <= 0)
|
|
break;
|
|
for (++p; i > 0; p += 4, i -= 3)
|
|
if (i >= 3) {
|
|
if (!(IS_DEC(*p) && IS_DEC(*(p + 1)) &&
|
|
IS_DEC(*(p + 2)) && IS_DEC(*(p + 3))))
|
|
OUT_OF_RANGE;
|
|
|
|
ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
|
|
putc(ch, outfp);
|
|
ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
|
|
putc(ch, outfp);
|
|
ch = DEC(p[2]) << 6 | DEC(p[3]);
|
|
putc(ch, outfp);
|
|
}
|
|
else {
|
|
if (i >= 1) {
|
|
if (!(IS_DEC(*p) && IS_DEC(*(p + 1))))
|
|
OUT_OF_RANGE;
|
|
ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
|
|
putc(ch, outfp);
|
|
}
|
|
if (i >= 2) {
|
|
if (!(IS_DEC(*(p + 1)) &&
|
|
IS_DEC(*(p + 2))))
|
|
OUT_OF_RANGE;
|
|
|
|
ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
|
|
putc(ch, outfp);
|
|
}
|
|
if (i >= 3) {
|
|
if (!(IS_DEC(*(p + 2)) &&
|
|
IS_DEC(*(p + 3))))
|
|
OUT_OF_RANGE;
|
|
ch = DEC(p[2]) << 6 | DEC(p[3]);
|
|
putc(ch, outfp);
|
|
}
|
|
}
|
|
}
|
|
if (fgets(buf, sizeof(buf), infp) == NULL ||
|
|
(strcmp(buf, "end") && strcmp(buf, "end\n") &&
|
|
strcmp(buf, "end\r\n"))) {
|
|
warnx("%s: no \"end\" line", infile);
|
|
return (1);
|
|
}
|
|
if (fclose(outfp) != 0) {
|
|
warnx("%s: %s", infile, outfile);
|
|
return (1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
base64_decode(void)
|
|
{
|
|
int n;
|
|
char inbuf[MAXPATHLEN+1];
|
|
unsigned char outbuf[MAXPATHLEN * 4];
|
|
|
|
for (;;) {
|
|
if (fgets(inbuf, sizeof(inbuf), infp) == NULL) {
|
|
warnx("%s: short file", infile);
|
|
return (1);
|
|
}
|
|
if (strcmp(inbuf, "====") == 0 ||
|
|
strcmp(inbuf, "====\n") == 0 ||
|
|
strcmp(inbuf, "====\r\n") == 0) {
|
|
if (fclose(outfp) != 0) {
|
|
warnx("%s: %s", infile, outfile);
|
|
return (1);
|
|
}
|
|
return (0);
|
|
}
|
|
n = strlen(inbuf);
|
|
while (n > 0 && (inbuf[n-1] == '\n' || inbuf[n-1] == '\r'))
|
|
inbuf[--n] = '\0';
|
|
n = b64_pton(inbuf, outbuf, sizeof(outbuf));
|
|
if (n < 0) {
|
|
warnx("%s: %s: error decoding base64 input stream", infile, outfile);
|
|
return (1);
|
|
}
|
|
fwrite(outbuf, 1, n, outfp);
|
|
}
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
(void)fprintf(stderr,
|
|
"usage: uudecode [-cips] [file ...]\n"
|
|
" uudecode [-i] -o output_file [file]\n"
|
|
" b64decode [-cips] [file ...]\n"
|
|
" b64decode [-i] -o output_file [file]\n");
|
|
exit(1);
|
|
}
|