uudecode.c revision 92623
1/*- 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#ifndef lint 35static const char copyright[] = 36"@(#) Copyright (c) 1983, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif /* not lint */ 39 40#ifndef lint 41#if 0 42static char sccsid[] = "@(#)uudecode.c 8.2 (Berkeley) 4/2/94"; 43#endif 44static const char rcsid[] = 45 "$FreeBSD: head/usr.bin/uudecode/uudecode.c 92623 2002-03-19 00:44:07Z jmallett $"; 46#endif /* not lint */ 47 48/* 49 * uudecode [file ...] 50 * 51 * create the specified file, decoding as you go. 52 * used with uuencode. 53 */ 54#include <sys/param.h> 55#include <sys/socket.h> 56#include <sys/stat.h> 57 58#include <netinet/in.h> 59 60#include <err.h> 61#include <pwd.h> 62#include <resolv.h> 63#include <stdio.h> 64#include <stdlib.h> 65#include <string.h> 66#include <unistd.h> 67 68const char *filename; 69char *outfile; 70int cflag, iflag, oflag, pflag, sflag; 71 72static void usage __P((void)); 73int decode __P((void)); 74int decode2 __P((int)); 75void base64_decode __P((const char *)); 76 77int 78main(argc, argv) 79 int argc; 80 char *argv[]; 81{ 82 int rval, ch; 83 84 while ((ch = getopt(argc, argv, "cio:ps")) != -1) { 85 switch(ch) { 86 case 'c': 87 if (oflag) 88 usage(); 89 cflag = 1; /* multiple uudecode'd files */ 90 break; 91 case 'i': 92 iflag = 1; /* ask before override files */ 93 break; 94 case 'o': 95 if (cflag || pflag || sflag) 96 usage(); 97 oflag = 1; /* output to the specified file */ 98 sflag = 1; /* do not strip pathnames for output */ 99 outfile = optarg; /* set the output filename */ 100 break; 101 case 'p': 102 if (oflag) 103 usage(); 104 pflag = 1; /* print output to stdout */ 105 break; 106 case 's': 107 if (oflag) 108 usage(); 109 sflag = 1; /* do not strip pathnames for output */ 110 break; 111 default: 112 usage(); 113 } 114 } 115 argc -= optind; 116 argv += optind; 117 118 119 if (*argv) { 120 rval = 0; 121 do { 122 if (!freopen(filename = *argv, "r", stdin)) { 123 warn("%s", *argv); 124 rval = 1; 125 continue; 126 } 127 rval |= decode(); 128 } while (*++argv); 129 } else { 130 filename = "stdin"; 131 rval = decode(); 132 } 133 exit(rval); 134} 135 136int 137decode () 138{ 139 int flag; 140 141 /* decode only one file per input stream */ 142 if (!cflag) 143 return(decode2(0)); 144 145 /* multiple uudecode'd files */ 146 for (flag = 0; ; flag++) 147 if (decode2(flag)) 148 return(1); 149 else if (feof(stdin)) 150 break; 151 152 return(0); 153} 154 155int 156decode2(flag) 157 int flag; 158{ 159 struct passwd *pw; 160 register int n; 161 register char ch, *p; 162 int base64, ignore, n1; 163 char buf[MAXPATHLEN+1]; 164 char buffn[MAXPATHLEN+1]; /* file name buffer */ 165 char *mode, *s; 166 void *mode_handle; 167 168 base64 = ignore = 0; 169 /* search for header line */ 170 do { 171 if (!fgets(buf, sizeof(buf), stdin)) { 172 if (flag) /* no error */ 173 return(0); 174 175 warnx("%s: no \"begin\" line", filename); 176 return(1); 177 } 178 } while (strncmp(buf, "begin", 5) != 0); 179 180 if (strncmp(buf, "begin-base64", 12) == 0) 181 base64 = 1; 182 183 /* Parse the header: begin{,-base64} mode outfile. */ 184 s = strtok(buf, " "); 185 if (s == NULL) 186 errx(1, "no mode or filename in input file"); 187 s = strtok(NULL, " "); 188 if (s == NULL) 189 errx(1, "no mode in input file"); 190 else { 191 mode = strdup(s); 192 if (mode == NULL) 193 err(1, "strdup()"); 194 } 195 if (!oflag) { 196 outfile = strtok(NULL, " \r\n"); 197 if (outfile == NULL) 198 errx(1, "no filename in input file"); 199 } 200 201 if (strlcpy(buf, outfile, sizeof(buf)) >= sizeof(buf)) 202 errx(1, "%s: filename too long", outfile); 203 if (!sflag && !pflag) { 204 strlcpy(buffn, buf, sizeof(buffn)); 205 if (strrchr(buffn, '/') != NULL) 206 strncpy(buf, strrchr(buffn, '/') + 1, sizeof(buf)); 207 if (buf[0] == '\0') { 208 warnx("%s: illegal filename", buffn); 209 return(1); 210 } 211 212 /* handle ~user/file format */ 213 if (buf[0] == '~') { 214 if (!(p = index(buf, '/'))) { 215 warnx("%s: illegal ~user", filename); 216 return(1); 217 } 218 *p++ = '\0'; 219 if (!(pw = getpwnam(buf + 1))) { 220 warnx("%s: no user %s", filename, buf); 221 return(1); 222 } 223 n = strlen(pw->pw_dir); 224 n1 = strlen(p); 225 if (n + n1 + 2 > MAXPATHLEN) { 226 warnx("%s: path too long", filename); 227 return(1); 228 } 229 bcopy(p, buf + n + 1, n1 + 1); 230 bcopy(pw->pw_dir, buf, n); 231 buf[n] = '/'; 232 } 233 } 234 235 /* create output file, set mode */ 236 if (pflag) 237 ; /* print to stdout */ 238 239 else { 240 mode_handle = setmode(mode); 241 if (mode_handle == NULL) 242 err(1, "setmode()"); 243 if (iflag && !access(buf, F_OK)) { 244 (void)fprintf(stderr, "not overwritten: %s\n", buf); 245 ignore++; 246 } else if (!freopen(buf, "w", stdout) || 247 fchmod(fileno(stdout), getmode(mode_handle, 0) & 0666)) { 248 warn("%s: %s", buf, filename); 249 return(1); 250 } 251 free(mode_handle); 252 free(mode); 253 } 254 strcpy(buffn, buf); /* store file name from header line */ 255 256 /* for each input line */ 257next: 258 for (;;) { 259 if (!fgets(p = buf, sizeof(buf), stdin)) { 260 warnx("%s: short file", filename); 261 return(1); 262 } 263 if (base64) { 264 if (strncmp(buf, "====", 4) == 0) 265 return (0); 266 base64_decode(buf); 267 goto next; 268 } 269#define DEC(c) (((c) - ' ') & 077) /* single character decode */ 270#define IS_DEC(c) ( (((c) - ' ') >= 0) && (((c) - ' ') <= 077 + 1) ) 271/* #define IS_DEC(c) (1) */ 272 273#define OUT_OF_RANGE \ 274{ \ 275 warnx( \ 276"\n\tinput file: %s\n\tencoded file: %s\n\tcharacter out of range: [%d-%d]", \ 277 filename, buffn, 1 + ' ', 077 + ' ' + 1); \ 278 return(1); \ 279} 280#define PUTCHAR(c) \ 281if (!ignore) \ 282 putchar(c) 283 284 285 /* 286 * `n' is used to avoid writing out all the characters 287 * at the end of the file. 288 */ 289 if ((n = DEC(*p)) <= 0) 290 break; 291 for (++p; n > 0; p += 4, n -= 3) 292 if (n >= 3) { 293 if (!(IS_DEC(*p) && IS_DEC(*(p + 1)) && 294 IS_DEC(*(p + 2)) && IS_DEC(*(p + 3)))) 295 OUT_OF_RANGE 296 297 ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4; 298 PUTCHAR(ch); 299 ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2; 300 PUTCHAR(ch); 301 ch = DEC(p[2]) << 6 | DEC(p[3]); 302 PUTCHAR(ch); 303 304 } 305 else { 306 if (n >= 1) { 307 if (!(IS_DEC(*p) && IS_DEC(*(p + 1)))) 308 OUT_OF_RANGE 309 ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4; 310 PUTCHAR(ch); 311 } 312 if (n >= 2) { 313 if (!(IS_DEC(*(p + 1)) && 314 IS_DEC(*(p + 2)))) 315 OUT_OF_RANGE 316 317 ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2; 318 PUTCHAR(ch); 319 } 320 if (n >= 3) { 321 if (!(IS_DEC(*(p + 2)) && 322 IS_DEC(*(p + 3)))) 323 OUT_OF_RANGE 324 ch = DEC(p[2]) << 6 | DEC(p[3]); 325 PUTCHAR(ch); 326 } 327 } 328 } 329 if (fgets(buf, sizeof(buf), stdin) == NULL || 330 (strcmp(buf, "end") && strcmp(buf, "end\n") && 331 strcmp(buf, "end\r\n"))) { 332 warnx("%s: no \"end\" line", filename); 333 return(1); 334 } 335 return(0); 336} 337 338void 339base64_decode(stream) 340 const char *stream; 341{ 342 unsigned char out[MAXPATHLEN * 4]; 343 int rv; 344 345 rv = b64_pton(stream, out, (sizeof(out) / sizeof(out[0]))); 346 if (rv == -1) 347 errx(1, "b64_pton: error decoding base64 input stream"); 348 printf("%s", out); 349} 350 351static void 352usage() 353{ 354 (void)fprintf(stderr, "usage: uudecode [-cips] [file ...]\n"); 355 (void)fprintf(stderr, "usage: uudecode [-i] -o output_file [file]\n"); 356 exit(1); 357} 358