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#if 0 35#ifndef lint 36static const char copyright[] = 37"@(#) Copyright (c) 1983, 1993\n\ 38 The Regents of the University of California. All rights reserved.\n"; 39#endif /* not lint */ 40 41#ifndef lint 42static char sccsid[] = "@(#)uudecode.c 8.2 (Berkeley) 4/2/94"; 43#endif /* not lint */ 44#endif 45#include <sys/cdefs.h> 46__FBSDID("$FreeBSD: head/usr.bin/uudecode/uudecode.c 214010 2010-10-18 05:44:11Z edwin $"); 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 <ctype.h> 61#include <err.h> 62#include <errno.h> 63#include <fcntl.h> 64#include <libgen.h> 65#include <pwd.h> 66#include <resolv.h> 67#include <stdio.h> 68#include <stdlib.h> 69#include <string.h> 70#include <unistd.h> 71 72static const char *infile, *outfile; 73static FILE *infp, *outfp; 74static int base64, cflag, iflag, oflag, pflag, rflag, sflag; 75 76static void usage(void); 77static int decode(void); 78static int decode2(void); 79static int uu_decode(void); 80static int base64_decode(void); 81 82int 83main(int argc, char *argv[]) 84{ 85 int rval, ch; 86 87 if (strcmp(basename(argv[0]), "b64decode") == 0) 88 base64 = 1; 89 90 while ((ch = getopt(argc, argv, "cimo:prs")) != -1) { 91 switch (ch) { 92 case 'c': 93 if (oflag || rflag) 94 usage(); 95 cflag = 1; /* multiple uudecode'd files */ 96 break; 97 case 'i': 98 iflag = 1; /* ask before override files */ 99 break; 100 case 'm': 101 base64 = 1; 102 break; 103 case 'o': 104 if (cflag || pflag || rflag || sflag) 105 usage(); 106 oflag = 1; /* output to the specified file */ 107 sflag = 1; /* do not strip pathnames for output */ 108 outfile = optarg; /* set the output filename */ 109 break; 110 case 'p': 111 if (oflag) 112 usage(); 113 pflag = 1; /* print output to stdout */ 114 break; 115 case 'r': 116 if (cflag || oflag) 117 usage(); 118 rflag = 1; /* decode raw data */ 119 break; 120 case 's': 121 if (oflag) 122 usage(); 123 sflag = 1; /* do not strip pathnames for output */ 124 break; 125 default: 126 usage(); 127 } 128 } 129// argc -= optind; 130 argv += optind; 131 132 if (*argv != NULL) { 133 rval = 0; 134 do { 135 infp = fopen(infile = *argv, "r"); 136 if (infp == NULL) { 137 warn("%s", *argv); 138 rval = 1; 139 continue; 140 } 141 rval |= decode(); 142 fclose(infp); 143 } while (*++argv); 144 } else { 145 infile = "stdin"; 146 infp = stdin; 147 rval = decode(); 148 } 149 exit(rval); 150} 151 152static int 153decode(void) 154{ 155 int r, v; 156 157 if (rflag) { 158 /* relaxed alternative to decode2() */ 159 outfile = "/dev/stdout"; 160 outfp = stdout; 161 if (base64) 162 return (base64_decode()); 163 else 164 return (uu_decode()); 165 } 166 v = decode2(); 167 if (v == EOF) { 168 warnx("%s: missing or bad \"begin\" line", infile); 169 return (1); 170 } 171 for (r = v; cflag; r |= v) { 172 v = decode2(); 173 if (v == EOF) 174 break; 175 } 176 return (r); 177} 178 179static int 180decode2(void) 181{ 182 int flags, fd, mode; 183 size_t n, m; 184 char *p, *q = NULL, *orig_outfile = NULL; 185 void *handle; 186 struct passwd *pw; 187 struct stat st; 188 char buf[MAXPATHLEN + 1]; 189 190 base64 = 0; 191 /* search for header line */ 192 for (;;) { 193 if (fgets(buf, sizeof(buf), infp) == NULL) 194 return (EOF); 195 p = buf; 196 if (strncmp(p, "begin-base64 ", 13) == 0) { 197 base64 = 1; 198 p += 13; 199 } else if (strncmp(p, "begin ", 6) == 0) 200 p += 6; 201 else 202 continue; 203 /* p points to mode */ 204 q = strchr(p, ' '); 205 if (q == NULL) 206 continue; 207 *q++ = '\0'; 208 /* q points to filename */ 209 n = strlen(q); 210 while (n > 0 && (q[n-1] == '\n' || q[n-1] == '\r')) 211 q[--n] = '\0'; 212 /* found valid header? */ 213 if (n > 0) 214 break; 215 } 216 orig_outfile = q; 217 handle = setmode(p); 218 if (handle == NULL) { 219 warnx("%s: unable to parse file mode", infile); 220 return (1); 221 } 222 mode = getmode(handle, 0); 223 free(handle); 224 225 if (sflag) { 226 /* don't strip, so try ~user/file expansion */ 227 p = NULL; 228 pw = NULL; 229 if (*q == '~') 230 p = strchr(q, '/'); 231 if (p != NULL) { 232 *p = '\0'; 233 pw = getpwnam(q + 1); 234 *p = '/'; 235 } 236 if (pw != NULL) { 237 n = strlen(pw->pw_dir); 238 if (buf + n > p) { 239 /* make room */ 240 m = strlen(p); 241 if (sizeof(buf) < n + m) { 242 warnx("%s: bad output filename", 243 infile); 244 return (1); 245 } 246 p = memmove(buf + n, p, m); 247 } 248 q = memcpy(p - n, pw->pw_dir, n); 249 } 250 } else { 251 /* strip down to leaf name */ 252 p = strrchr(q, '/'); 253 if (p != NULL) 254 q = p + 1; 255 } 256 if (!oflag) { 257 outfile = q ? strdup(q) : q; 258 } 259 260 /* POSIX says "/dev/stdout" is a 'magic cookie' not a special file. */ 261 if (pflag || (strcmp(oflag ? outfile : orig_outfile, "/dev/stdout") == 0)) { 262 outfp = stdout; 263 } else { 264 char pwd[MAXPATHLEN] = ""; 265 char targetpath[MAXPATHLEN]; 266 flags = O_WRONLY | O_CREAT | O_EXCL; 267 if (lstat(outfile, &st) == 0) { 268 if (iflag && !S_ISFIFO(st.st_mode)) { 269 warnc(EEXIST, "%s: %s", infile, outfile); 270 return (0); 271 } 272 273 flags = O_RDWR; 274 switch (st.st_mode & S_IFMT) { 275 case S_IFREG: 276 flags |= O_NOFOLLOW | O_TRUNC; 277 break; 278 case S_IFLNK: 279 if (NULL == realpath(".", pwd)) { 280 warn("Unable to get realpath for ."); 281 return (1); 282 } 283 flags |= O_CREAT; // for dangling symlinks 284 break; 285 case S_IFDIR: 286 warnc(EISDIR, "%s: %s", infile, outfile); 287 return (1); 288 case S_IFIFO: 289 flags &= ~O_EXCL; 290 break; 291 default: 292 if (oflag) { 293 /* trust command-line names */ 294 flags &= ~O_EXCL; 295 break; 296 } 297 warnc(EEXIST, "%s: %s", infile, outfile); 298 return (1); 299 } 300 } else if (errno != ENOENT) { 301 warn("%s: %s", infile, outfile); 302 return (1); 303 } 304 fd = open(outfile, flags, mode); 305 if (fd < 0) { 306 warn("%s: %s", infile, outfile); 307 return (1); 308 } 309 if (pwd[0]) { 310 if (-1 != fcntl(fd, F_GETPATH, targetpath)) { 311 if (strstr(targetpath, pwd) != targetpath) { 312 warnx("Target path %s is not based at %s", targetpath, pwd); 313 close(fd); 314 return (1); 315 } 316 ftruncate(fd, 0); 317 } else { 318 close(fd); 319 warn("Unable to get path for target: %s", outfile); 320 return (1); 321 } 322 } 323 if ((outfp = fdopen(fd, "w")) == NULL) { 324 warn("%s: %s", infile, outfile); 325 close(fd); 326 return (1); 327 } 328 if (fchmod(fileno(outfp), mode) && (EPERM != errno)) { 329 warn("%s: %s", infile, outfile); 330 close(fd); 331 return 1; 332 } 333 } 334 if (base64) 335 return (base64_decode()); 336 else 337 return (uu_decode()); 338} 339 340static int 341uugetline(char *buf, size_t size) 342{ 343 344 if (fgets(buf, size, infp) != NULL) 345 return (2); 346 if (rflag) 347 return (0); 348 warnx("%s: %s: short file", infile, outfile); 349 return (1); 350} 351 352static int 353checkend(const char *ptr, const char *end, const char *msg) 354{ 355 size_t n; 356 357 n = strlen(end); 358 if (strncmp(ptr, end, n) != 0 || 359 strspn(ptr + n, " \t\r\n") != strlen(ptr + n)) { 360 warnx("%s: %s: %s", infile, outfile, msg); 361 return (1); 362 } 363 if (fclose(outfp) != 0) { 364 warn("%s: %s", infile, outfile); 365 return (1); 366 } 367 return (0); 368} 369 370static int 371uu_decode(void) 372{ 373 int i, ch; 374 char *p; 375 char buf[MAXPATHLEN+1]; 376 377 /* for each input line */ 378 for (;;) { 379 switch (uugetline(buf, sizeof(buf))) { 380 case 0: 381 return (0); 382 case 1: 383 return (1); 384 } 385 386#define DEC(c) (((c) - ' ') & 077) /* single character decode */ 387#define IS_DEC(c) ( (((c) - ' ') >= 0) && (((c) - ' ') <= 077 + 1) ) 388 389#define OUT_OF_RANGE do { \ 390 warnx("%s: %s: character out of range: [%d-%d]", \ 391 infile, outfile, 1 + ' ', 077 + ' ' + 1); \ 392 return (1); \ 393} while (0) 394 395 /* 396 * `i' is used to avoid writing out all the characters 397 * at the end of the file. 398 */ 399 p = buf; 400 if ((i = DEC(*p)) <= 0) 401 break; 402 for (++p; i > 0; p += 4, i -= 3) 403 if (i >= 3) { 404 if (!(IS_DEC(*p) && IS_DEC(*(p + 1)) && 405 IS_DEC(*(p + 2)) && IS_DEC(*(p + 3)))) 406 OUT_OF_RANGE; 407 408 ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4; 409 putc(ch, outfp); 410 ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2; 411 putc(ch, outfp); 412 ch = DEC(p[2]) << 6 | DEC(p[3]); 413 putc(ch, outfp); 414 } else { 415 if (i >= 1) { 416 if (!(IS_DEC(*p) && IS_DEC(*(p + 1)))) 417 OUT_OF_RANGE; 418 ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4; 419 putc(ch, outfp); 420 } 421 if (i >= 2) { 422 if (!(IS_DEC(*(p + 1)) && 423 IS_DEC(*(p + 2)))) 424 OUT_OF_RANGE; 425 426 ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2; 427 putc(ch, outfp); 428 } 429 if (i >= 3) { 430 if (!(IS_DEC(*(p + 2)) && 431 IS_DEC(*(p + 3)))) 432 OUT_OF_RANGE; 433 ch = DEC(p[2]) << 6 | DEC(p[3]); 434 putc(ch, outfp); 435 } 436 } 437 } 438 switch (uugetline(buf, sizeof(buf))) { 439 case 0: 440 return (0); 441 case 1: 442 return (1); 443 default: 444 return (checkend(buf, "end", "no \"end\" line")); 445 } 446} 447 448static int 449base64_decode(void) 450{ 451 int n, count, count4; 452 char inbuf[MAXPATHLEN + 1], *p; 453 unsigned char outbuf[MAXPATHLEN * 4]; 454 char leftover[MAXPATHLEN + 1]; 455 456 leftover[0] = '\0'; 457 for (;;) { 458 strcpy(inbuf, leftover); 459 switch (uugetline(inbuf + strlen(inbuf), 460 sizeof(inbuf) - strlen(inbuf))) { 461 case 0: 462 return (0); 463 case 1: 464 return (1); 465 } 466 467 count = 0; 468 count4 = -1; 469 p = inbuf; 470 while (*p != '\0') { 471 /* 472 * Base64 encoded strings have the following 473 * characters in them: A-Z, a-z, 0-9 and +, / and = 474 */ 475 if (isalnum(*p) || *p == '+' || *p == '/' || *p == '=') 476 count++; 477 if (count % 4 == 0) 478 count4 = p - inbuf; 479 p++; 480 } 481 482 strcpy(leftover, inbuf + count4 + 1); 483 inbuf[count4 + 1] = 0; 484 485 n = b64_pton(inbuf, outbuf, sizeof(outbuf)); 486 487 if (n < 0) 488 break; 489 fwrite(outbuf, 1, n, outfp); 490 } 491 return (checkend(inbuf, "====", "error decoding base64 input stream")); 492} 493 494static void 495usage(void) 496{ 497 498 (void)fprintf(stderr, 499 "usage: uudecode [-cimprs] [file ...]\n" 500 " uudecode [-i] -o output_file [file]\n" 501 " b64decode [-cimprs] [file ...]\n" 502 " b64decode [-i] -o output_file [file]\n"); 503 exit(1); 504} 505