uudecode.c revision 1.26
1 /* $NetBSD: uudecode.c,v 1.26 2011/09/06 18:44:26 joerg Exp $ */ 2 3 /*- 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if HAVE_NBTOOL_CONFIG_H 33 #include "nbtool_config.h" 34 #endif 35 36 #include <sys/cdefs.h> 37 #if !defined(lint) 38 __COPYRIGHT("@(#) Copyright (c) 1983, 1993\ 39 The Regents of the University of California. All rights reserved."); 40 #if 0 41 static char sccsid[] = "@(#)uudecode.c 8.2 (Berkeley) 4/2/94"; 42 #endif 43 __RCSID("$NetBSD: uudecode.c,v 1.26 2011/09/06 18:44:26 joerg Exp $"); 44 #endif /* not lint */ 45 46 /* 47 * uudecode [file ...] 48 * 49 * create the specified file, decoding as you go. 50 * used with uuencode. 51 */ 52 #include <sys/param.h> 53 #include <sys/stat.h> 54 #include <ctype.h> 55 #include <err.h> 56 #include <errno.h> 57 #include <limits.h> 58 #include <locale.h> 59 #include <pwd.h> 60 #include <stdio.h> 61 #include <stdlib.h> 62 #include <string.h> 63 #include <unistd.h> 64 65 #ifndef NO_BASE64 66 #include <netinet/in.h> 67 #include <resolv.h> 68 #endif 69 70 static int decode(void); 71 __dead static void usage(void); 72 static int checkend(const char *, const char *, const char *); 73 static int base64_decode(void); 74 75 static int base64, pflag; 76 static const char *filename; 77 78 int 79 main(int argc, char *argv[]) 80 { 81 int ch, rval; 82 83 setlocale(LC_ALL, ""); 84 setprogname(argv[0]); 85 86 pflag = 0; 87 while ((ch = getopt(argc, argv, "mp")) != -1) 88 switch (ch) { 89 case 'm': 90 base64 = 1; 91 break; 92 case 'p': 93 pflag = 1; 94 break; 95 default: 96 usage(); 97 } 98 argc -= optind; 99 argv += optind; 100 101 if (*argv) { 102 rval = 0; 103 do { 104 if (!freopen(filename = *argv, "r", stdin)) { 105 warn("%s", *argv); 106 rval = 1; 107 continue; 108 } 109 rval |= decode(); 110 } while (*++argv); 111 } else { 112 filename = "stdin"; 113 rval = decode(); 114 } 115 exit(rval); 116 } 117 118 static int 119 decode(void) 120 { 121 struct passwd *pw; 122 int n; 123 char ch, *p; 124 int n1; 125 long mode; 126 char *fn; 127 char buf[MAXPATHLEN]; 128 129 /* search for header line */ 130 for (;;) { 131 if (!fgets(buf, sizeof(buf), stdin)) { 132 warnx("%s: no \"%s\" line", filename, base64 ? 133 "begin-base64" : "begin"); 134 return(1); 135 } 136 p = buf; 137 if (strncmp(p, "begin-base64", 12) == 0) { 138 base64 = 1; 139 p += 13; 140 break; 141 } else if (strncmp(p, "begin", 5) == 0) { 142 p += 6; 143 break; 144 } else 145 continue; 146 } 147 148 /* must be followed by an octal mode and a space */ 149 mode = strtol(p, &fn, 8); 150 if (fn == (p) || !isspace((unsigned char)*fn) || mode==LONG_MIN || mode==LONG_MAX) 151 { 152 warnx("%s: invalid mode on \"%s\" line", filename, 153 base64 ? "begin-base64" : "begin"); 154 return(1); 155 } 156 /* skip whitespace for file name */ 157 while (*fn && isspace((unsigned char)*fn)) fn++; 158 if (*fn == 0) { 159 warnx("%s: no filename on \"%s\" line", filename, 160 base64 ? "begin-base64" : "begin"); 161 return(1); 162 } 163 /* zap newline */ 164 for (p = fn; *p && *p != '\n'; p++) 165 ; 166 if (*p) *p = 0; 167 168 /* handle ~user/file format */ 169 if (*fn == '~') { 170 if (!(p = strchr(fn, '/'))) { 171 warnx("%s: illegal ~user.", filename); 172 return(1); 173 } 174 *p++ = '\0'; 175 if (!(pw = getpwnam(fn + 1))) { 176 warnx("%s: no user %s.", filename, buf); 177 return(1); 178 } 179 n = strlen(pw->pw_dir); 180 n1 = strlen(p); 181 if (n + n1 + 2 > MAXPATHLEN) { 182 warnx("%s: path too long.", filename); 183 return(1); 184 } 185 /* make space at beginning of buf by moving end of pathname */ 186 memmove(buf + n + 1, p, n1 + 1); 187 memmove(buf, pw->pw_dir, n); 188 buf[n] = '/'; 189 fn = buf; 190 } 191 192 /* create output file, set mode */ 193 if (!pflag && (!freopen(fn, "w", stdout) || 194 fchmod(fileno(stdout), mode & 0666))) { 195 warn("%s: %s", fn, filename); 196 return(1); 197 } 198 199 if (base64) 200 return base64_decode(); 201 else { 202 /* for each input line */ 203 for (;;) { 204 if (!fgets(p = buf, sizeof(buf), stdin)) { 205 warnx("%s: short file.", filename); 206 return(1); 207 } 208 #define DEC(c) (((c) - ' ') & 077) /* single character decode */ 209 /* 210 * `n' is used to avoid writing out all the characters 211 * at the end of the file. 212 */ 213 if ((n = DEC(*p)) <= 0) 214 break; 215 for (++p; n > 0; p += 4, n -= 3) 216 if (n >= 3) { 217 ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4; 218 putchar(ch); 219 ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2; 220 putchar(ch); 221 ch = DEC(p[2]) << 6 | DEC(p[3]); 222 putchar(ch); 223 } 224 else { 225 if (n >= 1) { 226 ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4; 227 putchar(ch); 228 } 229 if (n >= 2) { 230 ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2; 231 putchar(ch); 232 } 233 if (n >= 3) { 234 ch = DEC(p[2]) << 6 | DEC(p[3]); 235 putchar(ch); 236 } 237 } 238 } 239 if (!fgets(buf, sizeof(buf), stdin) || strcmp(buf, "end\n")) { 240 warnx("%s: no \"end\" line.", filename); 241 return(1); 242 } 243 return(0); 244 } 245 } 246 247 static int 248 checkend(const char *ptr, const char *end, const char *msg) 249 { 250 size_t n; 251 252 n = strlen(end); 253 if (strncmp(ptr, end, n) != 0 || 254 strspn(ptr + n, "\t\r\n") != strlen(ptr + n)) { 255 warnx("%s", msg); 256 return (1); 257 } 258 return (0); 259 } 260 261 static int 262 base64_decode(void) 263 { 264 int n; 265 char inbuf[MAXPATHLEN]; 266 unsigned char outbuf[MAXPATHLEN * 4]; 267 268 for (;;) { 269 if (!fgets(inbuf, sizeof(inbuf), stdin)) { 270 warnx("%s: short file.", filename); 271 return (1); 272 } 273 #ifdef NO_BASE64 274 warnx("%s: base64 decoding is not supported", filename); 275 return (1); 276 #else 277 n = b64_pton(inbuf, outbuf, sizeof(outbuf)); 278 #endif 279 if (n < 0) 280 break; 281 fwrite(outbuf, 1, n, stdout); 282 } 283 return (checkend(inbuf, "====", 284 "error decoding base64 input stream")); 285 } 286 287 static void 288 usage(void) 289 { 290 (void)fprintf(stderr, "usage: %s [-m | -p] [encoded-file ...]\n", 291 getprogname()); 292 exit(1); 293 } 294
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