Annotation of src/usr.bin/uudecode/uudecode.c, Revision 1.6
1.6 ! dgregor 1: /* $OpenBSD: uudecode.c,v 1.5 1998/05/29 21:07:22 deraadt Exp $ */
1.1 deraadt 2: /* $NetBSD: uudecode.c,v 1.6 1994/11/17 07:40:43 jtc Exp $ */
3:
4: /*-
5: * Copyright (c) 1983, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: char copyright[] =
38: "@(#) Copyright (c) 1983, 1993\n\
39: The Regents of the University of California. All rights reserved.\n";
40:
41: #ifndef lint
42: #if 0
43: static char sccsid[] = "@(#)uudecode.c 8.2 (Berkeley) 4/2/94";
44: #endif
1.6 ! dgregor 45: static char rcsid[] = "$OpenBSD: uudecode.c,v 1.5 1998/05/29 21:07:22 deraadt Exp $";
1.1 deraadt 46: #endif /* not lint */
47:
48: /*
1.6 ! dgregor 49: * uudecode [-p] [file ...]
1.1 deraadt 50: *
51: * create the specified file, decoding as you go.
52: * used with uuencode.
1.6 ! dgregor 53: *
! 54: * Write to stdout if '-p' is specified. Use this option if you care about
! 55: * security at all.
1.1 deraadt 56: */
57: #include <stdio.h>
58: #include <string.h>
59: #include <locale.h>
60: #include <errno.h>
61: #include <sys/param.h>
62: #include <sys/stat.h>
63:
64: #include <pwd.h>
65: #include <unistd.h>
66:
1.6 ! dgregor 67: static int decode(int);
1.1 deraadt 68: static void usage();
69: char *filename;
70:
71: int
72: main(argc, argv)
73: int argc;
74: char *argv[];
75: {
76: int rval;
1.6 ! dgregor 77: char ch;
! 78: int tostdout = 0;
1.1 deraadt 79:
80: setlocale(LC_ALL, "");
81:
1.6 ! dgregor 82: while ((ch = getopt(argc, argv, "p")) != -1)
! 83: switch((char)ch) {
! 84: case 'p':
! 85: tostdout++;
! 86: break;
! 87: case '?':
! 88: default:
! 89: usage();
! 90: }
1.1 deraadt 91: argc -= optind;
92: argv += optind;
93:
94: if (*argv) {
95: rval = 0;
96: do {
97: if (!freopen(filename = *argv, "r", stdin)) {
98: (void)fprintf(stderr, "uudecode: %s: %s\n",
99: *argv, strerror(errno));
100: rval = 1;
101: continue;
102: }
1.6 ! dgregor 103: rval |= decode(tostdout);
1.1 deraadt 104: } while (*++argv);
105: } else {
106: filename = "stdin";
1.6 ! dgregor 107: rval = decode(tostdout);
1.1 deraadt 108: }
109: exit(rval);
110: }
111:
112: static int
1.6 ! dgregor 113: decode(int tostdout)
1.1 deraadt 114: {
115: extern int errno;
116: struct passwd *pw;
117: register int n;
118: register char ch, *p;
119: int mode, n1;
120: char buf[MAXPATHLEN];
121:
122: /* search for header line */
123: do {
124: if (!fgets(buf, sizeof(buf), stdin)) {
125: (void)fprintf(stderr,
126: "uudecode: %s: no \"begin\" line\n", filename);
127: return(1);
128: }
129: } while (strncmp(buf, "begin ", 6));
1.5 deraadt 130: (void)sscanf(buf, "begin %o %1023[^\n\r]", &mode, buf);
1.1 deraadt 131:
132: /* handle ~user/file format */
133: if (buf[0] == '~') {
1.3 millert 134: if (!(p = strchr(buf, '/'))) {
1.1 deraadt 135: (void)fprintf(stderr, "uudecode: %s: illegal ~user.\n",
136: filename);
137: return(1);
138: }
139: *p++ = NULL;
140: if (!(pw = getpwnam(buf + 1))) {
141: (void)fprintf(stderr, "uudecode: %s: no user %s.\n",
142: filename, buf);
143: return(1);
144: }
145: n = strlen(pw->pw_dir);
146: n1 = strlen(p);
147: if (n + n1 + 2 > MAXPATHLEN) {
148: (void)fprintf(stderr, "uudecode: %s: path too long.\n",
149: filename);
150: return(1);
151: }
152: bcopy(p, buf + n + 1, n1 + 1);
153: bcopy(pw->pw_dir, buf, n);
154: buf[n] = '/';
155: }
156:
1.6 ! dgregor 157: if (!tostdout) {
! 158: /* create output file, set mode */
! 159: if (!freopen(buf, "w", stdout) ||
! 160: fchmod(fileno(stdout), mode&0666)) {
! 161: (void)fprintf(stderr, "uudecode: %s: %s: %s\n", buf,
! 162: filename, strerror(errno));
! 163: return(1);
! 164: }
1.1 deraadt 165: }
166:
167: /* for each input line */
168: for (;;) {
169: if (!fgets(p = buf, sizeof(buf), stdin)) {
170: (void)fprintf(stderr, "uudecode: %s: short file.\n",
171: filename);
172: return(1);
173: }
174: #define DEC(c) (((c) - ' ') & 077) /* single character decode */
175: /*
176: * `n' is used to avoid writing out all the characters
177: * at the end of the file.
178: */
179: if ((n = DEC(*p)) <= 0)
180: break;
181: for (++p; n > 0; p += 4, n -= 3)
182: if (n >= 3) {
183: ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
184: putchar(ch);
185: ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
186: putchar(ch);
187: ch = DEC(p[2]) << 6 | DEC(p[3]);
188: putchar(ch);
189: }
190: else {
191: if (n >= 1) {
192: ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
193: putchar(ch);
194: }
195: if (n >= 2) {
196: ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
197: putchar(ch);
198: }
199: if (n >= 3) {
200: ch = DEC(p[2]) << 6 | DEC(p[3]);
201: putchar(ch);
202: }
203: }
204: }
205: if (!fgets(buf, sizeof(buf), stdin) || strcmp(buf, "end\n")) {
206: (void)fprintf(stderr, "uudecode: %s: no \"end\" line.\n",
207: filename);
208: return(1);
209: }
210: return(0);
211: }
212:
213: static void
214: usage()
215: {
1.6 ! dgregor 216: (void)fprintf(stderr, "usage: uudecode [-p] [file ...]\n");
1.1 deraadt 217: exit(1);
218: }
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