OpenSolaris_b135/cmd/bnu/uudecode.c
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/* Copyright 2004 Sun Microsystems, Inc. All rights reserved. */
/* Use is subject to license terms. */
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* uudecode [-o outfile | -p] [input]
*
* create the specified file, decoding as you go.
* used with uuencode.
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <pwd.h>
#include <string.h>
#include <strings.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <locale.h>
#include <nl_types.h>
#include <langinfo.h>
#include <iconv.h>
#include <limits.h>
#include <errno.h>
#include <ctype.h>
#include <signal.h>
#include <stdarg.h>
#define BUFSIZE 90 /* must be a multiple of 3 */
#define TABLE_SIZE 0x40
#define isvalid(octet) (octet <= 0x40)
/*
* base64 decoding table
*/
/* BEGIN CSTYLED */
static char base64tab[] = {
'\377', '\377', '\377', '\377', '\377', '\377', '\377', '\377',
'\377', '\377', '\377', '\377', '\377', '\377', '\377', '\377',
'\377', '\377', '\377', '\377', '\377', '\377', '\377', '\377',
'\377', '\377', '\377', '\377', '\377', '\377', '\377', '\377',
'\377', '\377', '\377', '\377', '\377', '\377', '\377', '\377',
'\377', '\377', '\377', 62, '\377', '\377', '\377', 63,
52, 53, 54, 55, 56, 57, 58, 59,
60, 61, '\377', '\377', '\377', '\377', '\377', '\377',
'\377', 0, 1, 2, 3, 4, 5, 6,
7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22,
23, 24, 25, '\377', '\377', '\377', '\377', '\377',
'\377', 26, 27, 28, 29, 30, 31, 32,
33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48,
49, 50, 51, '\377', '\377', '\377', '\377', '\377'
};
/* END CSTYLED */
static char decode_table[UCHAR_MAX + 1];
/* DEC is the basic 1 character decoding function (historical algorithm) */
#define DEC(c) decode_table[c]
/* true if the character is in the base64 encoding table */
#define validbase64(c) (('A' <= (c) && (c) <= 'Z') || \
('a' <= (c) && (c) <= 'z') || \
('0' <= (c) && (c) <= '9') || \
(c) == '+' || (c) == '/')
static void decode(FILE *, FILE *, int);
static int outdec(unsigned char *, unsigned char *, int);
static int outdec64(unsigned char *, unsigned char *, int);
/* from usr/src/cmd/chmod/common.c */
void errmsg(int severity, int code, char *format, ...);
extern mode_t newmode(char *ms, mode_t new_mode, mode_t umsk,
char *file, char *path);
static char *prog;
static char outfile[PATH_MAX];
static int mode_err = 0; /* mode conversion error flag */
int
main(int argc, char **argv)
{
FILE *in, *out;
int pipeout = 0;
int oflag = 0;
int i;
mode_t mode, p_umask;
char dest[PATH_MAX];
char modebits[1024];
char buf[LINE_MAX];
int c, errflag = 0;
struct stat sbuf;
int base64flag = 0;
prog = argv[0];
(void) signal(SIGPIPE, SIG_DFL);
bzero(dest, sizeof (dest));
outfile[0] = '\0';
/* Set locale environment variables local definitions */
(void) setlocale(LC_ALL, "");
#if !defined(TEXT_DOMAIN) /* Should be defined by cc -D */
#define TEXT_DOMAIN "SYS_TEST" /* Use this only if it wasn't */
#endif
(void) textdomain(TEXT_DOMAIN);
p_umask = umask((mode_t)0);
while ((c = getopt(argc, argv, "o:p")) != EOF) {
switch (c) {
case 'o':
oflag++;
(void) strncpy(outfile, optarg, sizeof (outfile));
break;
case 'p':
pipeout++;
break;
default:
case '?':
errflag++;
break;
}
}
argc -= optind;
argv = &argv[optind];
/* optional input arg */
if (argc > 0) {
if ((in = fopen(*argv, "r")) == NULL) {
perror(*argv);
exit(1);
}
argv++; argc--;
} else {
in = stdin;
errno = 0;
if (fstat(fileno(in), &sbuf) < 0) {
perror("stdin");
exit(1);
}
}
if ((argc > 0) || errflag || (oflag && pipeout)) {
(void) fprintf(stderr,
gettext("Usage: %s [-o outfile | -p] [infile]\n"), prog);
exit(2);
}
/* search for header line */
for (;;) {
if (fgets(buf, sizeof (buf), in) == NULL) {
/* suppress message if we printed a mode error */
if (mode_err == 0)
(void) fprintf(stderr,
gettext("No begin line\n"));
exit(3);
}
/*
* the check for begin-base64 obviously needs to come
* first, since both algorithms' begin strings start
* with 'begin'. Also verify that there is a valid
* octal or symbolic file mode.
*/
if (strncmp(buf, "begin-base64", 12) == 0) {
base64flag = 1;
mode_err = 0;
if ((sscanf(buf + 13, "%1023s %1023s",
modebits, dest) == 2) &&
((sscanf(modebits, "%lo", &mode) == 1) ||
((mode = newmode(modebits, 0, p_umask,
"", "")) != 0) && mode_err == 0))
break;
} else if (strncmp(buf, "begin", 5) == 0) {
base64flag = 0;
mode_err = 0;
if ((sscanf(buf + 6, "%1023s %1023s",
modebits, dest) == 2) &&
((sscanf(modebits, "%lo", &mode) == 1) ||
((mode = newmode(modebits, 0, p_umask,
"", "")) != 0) && mode_err == 0))
break;
}
}
/*
* Now that we know the type of encoding used, we can
* initialize the decode table.
*/
if (base64flag == 0) {
(void) memset(decode_table, 0xFF, sizeof (decode_table));
for (i = 0; i <= TABLE_SIZE; i++)
decode_table[(unsigned char)i + 0x20] =
(unsigned char)i & 0x3F;
} else
(void) memcpy(decode_table, base64tab, sizeof (base64tab));
/*
* Filename specified on the command line with -o
* overrides filename in the encoded file.
*/
if (outfile[0] != '\0')
(void) strncpy(dest, outfile, sizeof (dest));
if (pipeout ||
(dest[0] == '-' && dest[1] == '\0' && outfile[0] == '\0')) {
out = stdout;
bzero(outfile, sizeof (outfile));
bzero(dest, sizeof (dest));
} else {
/* handle ~user/file format */
if (dest[0] == '~') {
char *sl;
struct passwd *user;
char dnbuf[100];
sl = strchr(dest, '/');
if (sl == NULL) {
(void) fprintf(stderr,
gettext("Illegal ~user\n"));
exit(3);
}
*sl++ = 0;
user = getpwnam(dest+1);
if (user == NULL) {
(void) fprintf(stderr,
gettext("No such user as %s\n"), dest);
exit(4);
}
(void) strncpy(dnbuf, user->pw_dir, sizeof (dnbuf));
(void) strlcat(dnbuf, "/", sizeof (dnbuf));
(void) strlcat(dnbuf, sl, sizeof (dnbuf));
(void) strncpy(dest, dnbuf, sizeof (dest));
}
}
/* if not using stdout, create file */
if (dest[0] != '\0') {
if ((out = fopen(dest, "w")) == NULL) {
perror(dest);
exit(4);
}
(void) chmod(dest, mode & 0777);
}
decode(in, out, base64flag);
if (fclose(out) == EOF) {
perror(prog);
exit(6);
}
return (0);
}
/*
* copy from in to out, decoding as you go along.
*/
static void
decode(FILE *in, FILE *out, int base64)
{
char inbuf[120], *ibp, *iptr;
unsigned char outbuf[BUFSIZE], *obp, *optr;
int n, octets, warned, endseen, numbase64chars;
unsigned char chr[4], curchr, ch;
longlong_t line;
if (! base64) { /* use historical algorithm */
warned = 0;
for (line = 1; ; line++) {
/* for each input line */
if (fgets(inbuf, sizeof (inbuf), in) == NULL) {
(void) fprintf(stderr,
gettext("No end line\n"));
exit(5);
}
/* Is line == 'end\n'? */
if (strcmp(inbuf, "end\n") == 0) {
break;
}
n = DEC(inbuf[0]);
if (n < 0)
continue;
/*
* Decode data lines.
*
* Note that uuencode/uudecode uses only the portable
* character set for encoded data and the portable
* character set characters must be represented in
* a single byte. We use this knowledge to reuse
* buffer space while decoding.
*/
octets = n;
obp = (unsigned char *) &inbuf[0];
ibp = &inbuf[1];
while (octets > 0) {
if ((ch = outdec((unsigned char *)obp,
(unsigned char *)ibp, octets))
!= 0x20) {
/* invalid characters where detected */
if (!warned) {
warned = 1;
(void) fprintf(stderr,
gettext("Invalid character"
" (0x%x) on line"
" %lld\n"), ch, line);
}
break;
}
ibp += 4;
obp += 3;
octets -= 3;
}
/*
* Only write out uncorrupted lines
*/
if (octets <= 0) {
(void) fwrite(inbuf, n, 1, out);
}
}
} else { /* use base64 algorithm */
endseen = numbase64chars = 0;
optr = outbuf;
while ((fgets(inbuf, sizeof (inbuf), in)) != NULL) {
/* process an input line */
iptr = inbuf;
while ((curchr = *(iptr++)) != NULL) {
/* decode chars */
if (curchr == '=') /* if end */
endseen++;
if (validbase64(curchr))
chr[numbase64chars++] = curchr;
/*
* if we've gathered 4 base64 octets
* we need to decode and output them
*/
if (numbase64chars == 4) {
/*LINTED*/
if (optr - outbuf > BUFSIZE - 3) {
(void) fwrite(outbuf,
/*LINTED*/
(size_t)(optr - outbuf),
1, out);
if (ferror(out)) {
perror(prog);
exit(6);
}
optr = outbuf;
}
octets = outdec64(optr, chr, 4);
optr += octets;
numbase64chars = 0;
}
}
/*
* handle any remaining base64 octets at end
*/
if (endseen && numbase64chars > 0) {
octets = outdec64(optr, chr, numbase64chars);
optr += octets;
numbase64chars = 0;
}
}
/*
* if we have generated any additional output
* in the buffer, write it out
*/
if (optr != outbuf) {
/*LINTED*/
(void) fwrite(outbuf, (size_t)(optr - outbuf),
1, out);
if (ferror(out)) {
perror(prog);
exit(6);
}
}
if (endseen == 0) {
(void) fprintf(stderr, gettext("No end line\n"));
exit(5);
}
}
}
/*
* historical algorithm
*
* output a group of 3 bytes (4 input characters).
* the input chars are pointed to by p, they are to
* be output to file f. n is used to tell us not to
* output all of them at the end of the file.
*/
static int
outdec(unsigned char *out, unsigned char *in, int n)
{
unsigned char b0 = DEC(*(in++));
unsigned char b1 = DEC(*(in++));
unsigned char b2 = DEC(*(in++));
unsigned char b3 = DEC(*in);
if (!isvalid(b0)) {
return (*(in-3));
}
if (!isvalid(b1)) {
return (*(in-2));
}
*(out++) = (b0 << 2) | (b1 >> 4);
if (n >= 2) {
if (!isvalid(b2)) {
return (*(in - 1));
}
*(out++) = (b1 << 4) | (b2 >> 2);
if (n >= 3) {
if (!isvalid(b3)) {
return (*in);
}
*out = (b2 << 6) | b3;
}
}
return (0x20); /* a know good value */
}
/*
* base64 algorithm
*
* Takes a pointer to the current position in the output buffer,
* a pointer to the (up to) 4 byte base64 input buffer and a
* count of the number of valid input bytes.
*
* Return the number of bytes placed in the output buffer
*/
static int
outdec64(unsigned char *out, unsigned char *chr, int num)
{
unsigned char char1, char2, char3, char4;
unsigned char *outptr = out;
int rc = 0;
switch (num) {
case 0:
case 1: /* these are impossible */
default:
break;
case 2: /* 2 base64 bytes == 1 decoded byte */
char1 = base64tab[chr[0]] & 0xFF;
char2 = base64tab[chr[1]] & 0xFF;
*(outptr++) = ((char1 << 2) & 0xFC) |
((char2 >> 4) & 0x03);
rc = 1;
break;
case 3: /* 3 base64 bytes == 2 decoded bytes */
char1 = base64tab[chr[0]] & 0xFF;
char2 = base64tab[chr[1]] & 0xFF;
char3 = base64tab[chr[2]] & 0xFF;
*(outptr++) = ((char1 << 2) & 0xFC) |
((char2 >> 4) & 0x03);
*(outptr++) = ((char2 << 4) & 0xF0) |
((char3 >> 2) & 0x0F);
rc = 2;
break;
case 4: /* 4 base64 bytes == 3 decoded bytes */
char1 = base64tab[chr[0]] & 0xFF;
char2 = base64tab[chr[1]] & 0xFF;
char3 = base64tab[chr[2]] & 0xFF;
char4 = base64tab[chr[3]] & 0xFF;
*(outptr++) = ((char1 << 2) & 0xFC) |
((char2 >> 4) & 0x03);
*(outptr++) = ((char2 << 4) & 0xF0) |
((char3 >> 2) & 0x0F);
*(outptr++) = ((char3 << 6) & 0xC0) |
(char4 & 0x3F);
rc = 3;
break;
}
return (rc);
}
/*
* error message routine called by newmode.
*
* The severity and code are ignored here. If this routine gets
* called, we set a global flag (which can be tested after return
* from here) which tells us whether or not a valid mode has been
* parsed or if we printed an error message.
*/
/*ARGSUSED*/
void
errmsg(int severity, int code, char *format, ...)
{
va_list ap;
va_start(ap, format);
(void) fprintf(stderr, "uudecode: ");
(void) fprintf(stderr, format, ap);
va_end(ap);
mode_err = 1;
}