1 /* $OpenBSD: uudecode.c,v 1.12 2003/07/10 00:06:51 david Exp $ */ 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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 char copyright[] = 34 "@(#) Copyright (c) 1983, 1993\n\ 35 The Regents of the University of California. All rights reserved.\n"; 36 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)uudecode.c 8.2 (Berkeley) 4/2/94"; 40 #endif 41 static char rcsid[] = "$OpenBSD: uudecode.c,v 1.12 2003/07/10 00:06:51 david Exp $"; 42 #endif /* not lint */ 43 44 /* 45 * uudecode [-p] [file ...] 46 * 47 * create the specified file, decoding as you go. 48 * used with uuencode. 49 * 50 * Write to stdout if '-p' is specified. Use this option if you care about 51 * security at all. 52 */ 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <locale.h> 57 #include <errno.h> 58 #include <sys/param.h> 59 #include <sys/stat.h> 60 61 #include <pwd.h> 62 #include <unistd.h> 63 64 static int decode(int); 65 static void usage(void); 66 char *filename; 67 68 int 69 main(int argc, char *argv[]) 70 { 71 int rval; 72 int ch; 73 int tostdout = 0; 74 75 setlocale(LC_ALL, ""); 76 77 while ((ch = getopt(argc, argv, "p")) != -1) 78 switch((char)ch) { 79 case 'p': 80 tostdout++; 81 break; 82 case '?': 83 default: 84 usage(); 85 } 86 argc -= optind; 87 argv += optind; 88 89 if (*argv) { 90 rval = 0; 91 do { 92 if (!freopen(filename = *argv, "r", stdin)) { 93 (void)fprintf(stderr, "uudecode: %s: %s\n", 94 *argv, strerror(errno)); 95 rval = 1; 96 continue; 97 } 98 rval |= decode(tostdout); 99 } while (*++argv); 100 } else { 101 filename = "stdin"; 102 rval = decode(tostdout); 103 } 104 exit(rval); 105 } 106 107 static int 108 decode(int tostdout) 109 { 110 struct passwd *pw; 111 int n; 112 char ch, *p; 113 int mode, n1; 114 char buf[MAXPATHLEN]; 115 116 /* search for header line */ 117 do { 118 if (!fgets(buf, sizeof(buf), stdin)) { 119 (void)fprintf(stderr, 120 "uudecode: %s: no \"begin\" line\n", filename); 121 return(1); 122 } 123 } while (strncmp(buf, "begin ", 6)); 124 (void)sscanf(buf, "begin %o %1023[^\n\r]", &mode, buf); 125 126 /* handle ~user/file format */ 127 if (buf[0] == '~') { 128 if (!(p = strchr(buf, '/'))) { 129 (void)fprintf(stderr, "uudecode: %s: illegal ~user.\n", 130 filename); 131 return(1); 132 } 133 *p++ = NULL; 134 if (!(pw = getpwnam(buf + 1))) { 135 (void)fprintf(stderr, "uudecode: %s: no user %s.\n", 136 filename, buf); 137 return(1); 138 } 139 n = strlen(pw->pw_dir); 140 n1 = strlen(p); 141 if (n + n1 + 2 > MAXPATHLEN) { 142 (void)fprintf(stderr, "uudecode: %s: path too long.\n", 143 filename); 144 return(1); 145 } 146 bcopy(p, buf + n + 1, n1 + 1); 147 bcopy(pw->pw_dir, buf, n); 148 buf[n] = '/'; 149 } 150 151 if (!tostdout) { 152 /* create output file, set mode */ 153 if (!freopen(buf, "w", stdout) || 154 fchmod(fileno(stdout), mode&0666)) { 155 (void)fprintf(stderr, "uudecode: %s: %s: %s\n", buf, 156 filename, strerror(errno)); 157 return(1); 158 } 159 } 160 161 /* for each input line */ 162 for (;;) { 163 if (!fgets(p = buf, sizeof(buf), stdin)) { 164 (void)fprintf(stderr, "uudecode: %s: short file.\n", 165 filename); 166 return(1); 167 } 168 #define DEC(c) (((c) - ' ') & 077) /* single character decode */ 169 /* 170 * `n' is used to avoid writing out all the characters 171 * at the end of the file. 172 */ 173 if ((n = DEC(*p)) <= 0) 174 break; 175 for (++p; n > 0; p += 4, n -= 3) 176 if (n >= 3) { 177 ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4; 178 putchar(ch); 179 ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2; 180 putchar(ch); 181 ch = DEC(p[2]) << 6 | DEC(p[3]); 182 putchar(ch); 183 } 184 else { 185 if (n >= 1) { 186 ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4; 187 putchar(ch); 188 } 189 if (n >= 2) { 190 ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2; 191 putchar(ch); 192 } 193 if (n >= 3) { 194 ch = DEC(p[2]) << 6 | DEC(p[3]); 195 putchar(ch); 196 } 197 } 198 } 199 if (!fgets(buf, sizeof(buf), stdin) || strcmp(buf, "end\n")) { 200 (void)fprintf(stderr, "uudecode: %s: no \"end\" line.\n", 201 filename); 202 return(1); 203 } 204 return(0); 205 } 206 207 static void 208 usage(void) 209 { 210 (void)fprintf(stderr, "usage: uudecode [-p] [file ...]\n"); 211 exit(1); 212 } 213