| File: | src/usr.bin/uudecode/uudecode.c |
| Warning: | line 123, column 2 Value stored to 'argc' is never read |
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| 1 | /* $OpenBSD: uudecode.c,v 1.27 2019/06/28 13:35:05 deraadt Exp $ */ |
| 2 | /* $FreeBSD: uudecode.c,v 1.49 2003/05/03 19:44:46 obrien 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 | /* |
| 34 | * Create the specified file, decoding as you go. |
| 35 | * Used with uuencode. |
| 36 | */ |
| 37 | |
| 38 | #include <sys/stat.h> |
| 39 | |
| 40 | #include <netinet/in.h> |
| 41 | |
| 42 | #include <err.h> |
| 43 | #include <errno(*__errno()).h> |
| 44 | #include <fcntl.h> |
| 45 | #include <limits.h> |
| 46 | #include <pwd.h> |
| 47 | #include <resolv.h> |
| 48 | #include <stdio.h> |
| 49 | #include <stdlib.h> |
| 50 | #include <string.h> |
| 51 | #include <unistd.h> |
| 52 | |
| 53 | static const char *infile, *outfile; |
| 54 | static FILE *infp, *outfp; |
| 55 | static int base64, cflag, iflag, oflag, pflag, rflag, sflag; |
| 56 | |
| 57 | static void __dead__attribute__((__noreturn__)) usage(void); |
| 58 | static int decode(void); |
| 59 | static int decode2(void); |
| 60 | static int uu_decode(void); |
| 61 | static int base64_decode(void); |
| 62 | |
| 63 | enum program_mode { |
| 64 | MODE_DECODE, |
| 65 | MODE_B64DECODE |
| 66 | } pmode; |
| 67 | |
| 68 | int |
| 69 | main(int argc, char *argv[]) |
| 70 | { |
| 71 | int rval, ch; |
| 72 | extern char *__progname; |
| 73 | static const char *optstr[2] = { |
| 74 | "cimo:prs", |
| 75 | "cio:prs" |
| 76 | }; |
| 77 | |
| 78 | pmode = MODE_DECODE; |
| 79 | if (strcmp(__progname, "b64decode") == 0) { |
| 80 | base64 = 1; |
| 81 | pmode = MODE_B64DECODE; |
| 82 | } |
| 83 | |
| 84 | while ((ch = getopt(argc, argv, optstr[pmode])) != -1) { |
| 85 | switch(ch) { |
| 86 | case 'c': |
| 87 | if (oflag || rflag) |
| 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 'm': |
| 95 | base64 = 1; |
| 96 | break; |
| 97 | case 'o': |
| 98 | if (cflag || pflag || rflag || sflag) |
| 99 | usage(); |
| 100 | oflag = 1; /* output to the specified file */ |
| 101 | sflag = 1; /* do not strip pathnames for output */ |
| 102 | outfile = optarg; /* set the output filename */ |
| 103 | break; |
| 104 | case 'p': |
| 105 | if (oflag) |
| 106 | usage(); |
| 107 | pflag = 1; /* print output to stdout */ |
| 108 | break; |
| 109 | case 'r': |
| 110 | if (cflag || oflag) |
| 111 | usage(); |
| 112 | rflag = 1; /* decode raw data */ |
| 113 | break; |
| 114 | case 's': |
| 115 | if (oflag) |
| 116 | usage(); |
| 117 | sflag = 1; /* do not strip pathnames for output */ |
| 118 | break; |
| 119 | default: |
| 120 | usage(); |
| 121 | } |
| 122 | } |
| 123 | argc -= optind; |
Value stored to 'argc' is never read | |
| 124 | argv += optind; |
| 125 | |
| 126 | if (sflag) { |
| 127 | if (pledge("stdio rpath wpath cpath getpw", NULL((void *)0)) == -1) |
| 128 | err(1, "pledge"); |
| 129 | } else if (pflag == 0) { |
| 130 | if (pledge("stdio rpath wpath cpath", NULL((void *)0)) == -1) |
| 131 | err(1, "pledge"); |
| 132 | } else { |
| 133 | if (pledge("stdio rpath", NULL((void *)0)) == -1) |
| 134 | err(1, "pledge"); |
| 135 | } |
| 136 | |
| 137 | if (*argv) { |
| 138 | rval = 0; |
| 139 | do { |
| 140 | infp = fopen(infile = *argv, "r"); |
| 141 | if (infp == NULL((void *)0)) { |
| 142 | warn("%s", *argv); |
| 143 | rval = 1; |
| 144 | continue; |
| 145 | } |
| 146 | rval |= decode(); |
| 147 | fclose(infp); |
| 148 | } while (*++argv); |
| 149 | } else { |
| 150 | infile = "stdin"; |
| 151 | infp = stdin(&__sF[0]); |
| 152 | rval = decode(); |
| 153 | } |
| 154 | return (rval); |
| 155 | } |
| 156 | |
| 157 | static int |
| 158 | decode(void) |
| 159 | { |
| 160 | int r, v; |
| 161 | |
| 162 | if (rflag) { |
| 163 | /* relaxed alternative to decode2() */ |
| 164 | outfile = "/dev/stdout"; |
| 165 | outfp = stdout(&__sF[1]); |
| 166 | if (base64) |
| 167 | return (base64_decode()); |
| 168 | else |
| 169 | return (uu_decode()); |
| 170 | } |
| 171 | v = decode2(); |
| 172 | if (v == EOF(-1)) { |
| 173 | warnx("%s: missing or bad \"begin\" line", infile); |
| 174 | return (1); |
| 175 | } |
| 176 | for (r = v; cflag; r |= v) { |
| 177 | v = decode2(); |
| 178 | if (v == EOF(-1)) |
| 179 | break; |
| 180 | } |
| 181 | return (r); |
| 182 | } |
| 183 | |
| 184 | static int |
| 185 | decode2(void) |
| 186 | { |
| 187 | int flags, fd, mode; |
| 188 | size_t n, m; |
| 189 | char *p, *q; |
| 190 | void *handle; |
| 191 | struct passwd *pw; |
| 192 | struct stat st; |
| 193 | char buf[PATH_MAX1024]; |
| 194 | |
| 195 | base64 = 0; |
| 196 | /* search for header line */ |
| 197 | for (;;) { |
| 198 | if (fgets(buf, sizeof(buf), infp) == NULL((void *)0)) |
| 199 | return (EOF(-1)); |
| 200 | p = buf; |
| 201 | if (strncmp(p, "begin-base64 ", 13) == 0) { |
| 202 | base64 = 1; |
| 203 | p += 13; |
| 204 | } else if (strncmp(p, "begin ", 6) == 0) |
| 205 | p += 6; |
| 206 | else |
| 207 | continue; |
| 208 | /* p points to mode */ |
| 209 | q = strchr(p, ' '); |
| 210 | if (q == NULL((void *)0)) |
| 211 | continue; |
| 212 | *q++ = '\0'; |
| 213 | /* q points to filename */ |
| 214 | n = strlen(q); |
| 215 | while (n > 0 && (q[n-1] == '\n' || q[n-1] == '\r')) |
| 216 | q[--n] = '\0'; |
| 217 | /* found valid header? */ |
| 218 | if (n > 0) |
| 219 | break; |
| 220 | } |
| 221 | |
| 222 | handle = setmode(p); |
| 223 | if (handle == NULL((void *)0)) { |
| 224 | warnx("%s: unable to parse file mode", infile); |
| 225 | return (1); |
| 226 | } |
| 227 | mode = getmode(handle, 0) & 0666; |
| 228 | free(handle); |
| 229 | |
| 230 | if (sflag) { |
| 231 | /* don't strip, so try ~user/file expansion */ |
| 232 | p = NULL((void *)0); |
| 233 | pw = NULL((void *)0); |
| 234 | if (*q == '~') |
| 235 | p = strchr(q, '/'); |
| 236 | if (p != NULL((void *)0)) { |
| 237 | *p = '\0'; |
| 238 | pw = getpwnam(q + 1); |
| 239 | *p = '/'; |
| 240 | } |
| 241 | if (pw != NULL((void *)0)) { |
| 242 | n = strlen(pw->pw_dir); |
| 243 | if (buf + n > p) { |
| 244 | /* make room */ |
| 245 | m = strlen(p); |
| 246 | if (sizeof(buf) < n + m) { |
| 247 | warnx("%s: bad output filename", |
| 248 | infile); |
| 249 | return (1); |
| 250 | } |
| 251 | p = memmove(buf + n, p, m); |
| 252 | } |
| 253 | q = memcpy(p - n, pw->pw_dir, n); |
| 254 | } |
| 255 | } else { |
| 256 | /* strip down to leaf name */ |
| 257 | p = strrchr(q, '/'); |
| 258 | if (p != NULL((void *)0)) |
| 259 | q = p + 1; |
| 260 | } |
| 261 | if (!oflag) |
| 262 | outfile = q; |
| 263 | |
| 264 | /* POSIX says "/dev/stdout" is a 'magic cookie' not a special file. */ |
| 265 | if (pflag || strcmp(outfile, "/dev/stdout") == 0) |
| 266 | outfp = stdout(&__sF[1]); |
| 267 | else { |
| 268 | flags = O_WRONLY0x0001|O_CREAT0x0200|O_EXCL0x0800|O_NOFOLLOW0x0100; |
| 269 | if (lstat(outfile, &st) == 0) { |
| 270 | if (iflag) { |
| 271 | warnc(EEXIST17, "%s: %s", infile, outfile); |
| 272 | return (0); |
| 273 | } |
| 274 | switch (st.st_mode & S_IFMT0170000) { |
| 275 | case S_IFREG0100000: |
| 276 | case S_IFLNK0120000: |
| 277 | /* avoid symlink attacks */ |
| 278 | if (unlink(outfile) == 0 || errno(*__errno()) == ENOENT2) |
| 279 | break; |
| 280 | warn("%s: unlink %s", infile, outfile); |
| 281 | return (1); |
| 282 | case S_IFDIR0040000: |
| 283 | warnc(EISDIR21, "%s: %s", infile, outfile); |
| 284 | return (1); |
| 285 | default: |
| 286 | if (oflag) { |
| 287 | /* trust command-line names */ |
| 288 | flags &= ~(O_EXCL0x0800|O_NOFOLLOW0x0100); |
| 289 | break; |
| 290 | } |
| 291 | warnc(EEXIST17, "%s: %s", infile, outfile); |
| 292 | return (1); |
| 293 | } |
| 294 | } else if (errno(*__errno()) != ENOENT2) { |
| 295 | warn("%s: %s", infile, outfile); |
| 296 | return (1); |
| 297 | } |
| 298 | if ((fd = open(outfile, flags, mode)) == -1 || |
| 299 | (outfp = fdopen(fd, "w")) == NULL((void *)0)) { |
| 300 | warn("%s: %s", infile, outfile); |
| 301 | return (1); |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | if (base64) |
| 306 | return (base64_decode()); |
| 307 | else |
| 308 | return (uu_decode()); |
| 309 | } |
| 310 | |
| 311 | static int |
| 312 | get_line(char *buf, size_t size) |
| 313 | { |
| 314 | if (fgets(buf, size, infp) != NULL((void *)0)) |
| 315 | return (2); |
| 316 | if (rflag) |
| 317 | return (0); |
| 318 | warnx("%s: %s: short file", infile, outfile); |
| 319 | return (1); |
| 320 | } |
| 321 | |
| 322 | static int |
| 323 | checkend(const char *ptr, const char *end, const char *msg) |
| 324 | { |
| 325 | size_t n; |
| 326 | |
| 327 | n = strlen(end); |
| 328 | if (strncmp(ptr, end, n) != 0 || |
| 329 | strspn(ptr + n, " \t\r\n") != strlen(ptr + n)) { |
| 330 | warnx("%s: %s: %s", infile, outfile, msg); |
| 331 | return (1); |
| 332 | } |
| 333 | if (fclose(outfp) != 0) { |
| 334 | warn("%s: %s", infile, outfile); |
| 335 | return (1); |
| 336 | } |
| 337 | return (0); |
| 338 | } |
| 339 | |
| 340 | static int |
| 341 | uu_decode(void) |
| 342 | { |
| 343 | int i, ch; |
| 344 | char *p; |
| 345 | char buf[PATH_MAX1024]; |
| 346 | |
| 347 | /* for each input line */ |
| 348 | for (;;) { |
| 349 | switch (get_line(buf, sizeof(buf))) { |
| 350 | case 0: |
| 351 | return (0); |
| 352 | case 1: |
| 353 | return (1); |
| 354 | } |
| 355 | |
| 356 | #define DEC(c)(((c) - ' ') & 077) (((c) - ' ') & 077) /* single character decode */ |
| 357 | #define IS_DEC(c)( (((c) - ' ') >= 0) && (((c) - ' ') <= 077 + 1 ) ) ( (((c) - ' ') >= 0) && (((c) - ' ') <= 077 + 1) ) |
| 358 | |
| 359 | #define OUT_OF_RANGE(c)do { warnx("%s: %s: character value (%d) out of range [%d-%d]" , infile, outfile, (unsigned char)(c), 1 + ' ', 077 + ' ' + 1 ); return (1); } while (0) do { \ |
| 360 | warnx("%s: %s: character value (%d) out of range [%d-%d]", \ |
| 361 | infile, outfile, (unsigned char)(c), 1 + ' ', 077 + ' ' + 1); \ |
| 362 | return (1); \ |
| 363 | } while (0) |
| 364 | |
| 365 | /* |
| 366 | * `i' is used to avoid writing out all the characters |
| 367 | * at the end of the file. |
| 368 | */ |
| 369 | p = buf; |
| 370 | if ((i = DEC(*p)(((*p) - ' ') & 077)) <= 0) |
| 371 | break; |
| 372 | for (++p; i > 0; p += 4, i -= 3) |
| 373 | if (i >= 3) { |
| 374 | if (!IS_DEC(*p)( (((*p) - ' ') >= 0) && (((*p) - ' ') <= 077 + 1) )) |
| 375 | OUT_OF_RANGE(*p)do { warnx("%s: %s: character value (%d) out of range [%d-%d]" , infile, outfile, (unsigned char)(*p), 1 + ' ', 077 + ' ' + 1 ); return (1); } while (0); |
| 376 | if (!IS_DEC(*(p + 1))( (((*(p + 1)) - ' ') >= 0) && (((*(p + 1)) - ' ') <= 077 + 1) )) |
| 377 | OUT_OF_RANGE(*(p + 1))do { warnx("%s: %s: character value (%d) out of range [%d-%d]" , infile, outfile, (unsigned char)(*(p + 1)), 1 + ' ', 077 + ' ' + 1); return (1); } while (0); |
| 378 | if (!IS_DEC(*(p + 2))( (((*(p + 2)) - ' ') >= 0) && (((*(p + 2)) - ' ') <= 077 + 1) )) |
| 379 | OUT_OF_RANGE(*(p + 2))do { warnx("%s: %s: character value (%d) out of range [%d-%d]" , infile, outfile, (unsigned char)(*(p + 2)), 1 + ' ', 077 + ' ' + 1); return (1); } while (0); |
| 380 | if (!IS_DEC(*(p + 3))( (((*(p + 3)) - ' ') >= 0) && (((*(p + 3)) - ' ') <= 077 + 1) )) |
| 381 | OUT_OF_RANGE(*(p + 3))do { warnx("%s: %s: character value (%d) out of range [%d-%d]" , infile, outfile, (unsigned char)(*(p + 3)), 1 + ' ', 077 + ' ' + 1); return (1); } while (0); |
| 382 | ch = DEC(p[0])(((p[0]) - ' ') & 077) << 2 | DEC(p[1])(((p[1]) - ' ') & 077) >> 4; |
| 383 | putc(ch, outfp)(!__isthreaded ? __sputc(ch, outfp) : (putc)(ch, outfp)); |
| 384 | ch = DEC(p[1])(((p[1]) - ' ') & 077) << 4 | DEC(p[2])(((p[2]) - ' ') & 077) >> 2; |
| 385 | putc(ch, outfp)(!__isthreaded ? __sputc(ch, outfp) : (putc)(ch, outfp)); |
| 386 | ch = DEC(p[2])(((p[2]) - ' ') & 077) << 6 | DEC(p[3])(((p[3]) - ' ') & 077); |
| 387 | putc(ch, outfp)(!__isthreaded ? __sputc(ch, outfp) : (putc)(ch, outfp)); |
| 388 | } |
| 389 | else { |
| 390 | if (i >= 1) { |
| 391 | if (!IS_DEC(*p)( (((*p) - ' ') >= 0) && (((*p) - ' ') <= 077 + 1) )) |
| 392 | OUT_OF_RANGE(*p)do { warnx("%s: %s: character value (%d) out of range [%d-%d]" , infile, outfile, (unsigned char)(*p), 1 + ' ', 077 + ' ' + 1 ); return (1); } while (0); |
| 393 | if (!IS_DEC(*(p + 1))( (((*(p + 1)) - ' ') >= 0) && (((*(p + 1)) - ' ') <= 077 + 1) )) |
| 394 | OUT_OF_RANGE(*(p + 1))do { warnx("%s: %s: character value (%d) out of range [%d-%d]" , infile, outfile, (unsigned char)(*(p + 1)), 1 + ' ', 077 + ' ' + 1); return (1); } while (0); |
| 395 | ch = DEC(p[0])(((p[0]) - ' ') & 077) << 2 | DEC(p[1])(((p[1]) - ' ') & 077) >> 4; |
| 396 | putc(ch, outfp)(!__isthreaded ? __sputc(ch, outfp) : (putc)(ch, outfp)); |
| 397 | } |
| 398 | if (i >= 2) { |
| 399 | if (!IS_DEC(*(p + 1))( (((*(p + 1)) - ' ') >= 0) && (((*(p + 1)) - ' ') <= 077 + 1) )) |
| 400 | OUT_OF_RANGE(*(p + 1))do { warnx("%s: %s: character value (%d) out of range [%d-%d]" , infile, outfile, (unsigned char)(*(p + 1)), 1 + ' ', 077 + ' ' + 1); return (1); } while (0); |
| 401 | if (!IS_DEC(*(p + 2))( (((*(p + 2)) - ' ') >= 0) && (((*(p + 2)) - ' ') <= 077 + 1) )) |
| 402 | OUT_OF_RANGE(*(p + 2))do { warnx("%s: %s: character value (%d) out of range [%d-%d]" , infile, outfile, (unsigned char)(*(p + 2)), 1 + ' ', 077 + ' ' + 1); return (1); } while (0); |
| 403 | ch = DEC(p[1])(((p[1]) - ' ') & 077) << 4 | DEC(p[2])(((p[2]) - ' ') & 077) >> 2; |
| 404 | putc(ch, outfp)(!__isthreaded ? __sputc(ch, outfp) : (putc)(ch, outfp)); |
| 405 | } |
| 406 | if (i >= 3) { |
| 407 | if (!IS_DEC(*(p + 2))( (((*(p + 2)) - ' ') >= 0) && (((*(p + 2)) - ' ') <= 077 + 1) )) |
| 408 | OUT_OF_RANGE(*(p + 2))do { warnx("%s: %s: character value (%d) out of range [%d-%d]" , infile, outfile, (unsigned char)(*(p + 2)), 1 + ' ', 077 + ' ' + 1); return (1); } while (0); |
| 409 | if (!IS_DEC(*(p + 3))( (((*(p + 3)) - ' ') >= 0) && (((*(p + 3)) - ' ') <= 077 + 1) )) |
| 410 | OUT_OF_RANGE(*(p + 3))do { warnx("%s: %s: character value (%d) out of range [%d-%d]" , infile, outfile, (unsigned char)(*(p + 3)), 1 + ' ', 077 + ' ' + 1); return (1); } while (0); |
| 411 | ch = DEC(p[2])(((p[2]) - ' ') & 077) << 6 | DEC(p[3])(((p[3]) - ' ') & 077); |
| 412 | putc(ch, outfp)(!__isthreaded ? __sputc(ch, outfp) : (putc)(ch, outfp)); |
| 413 | } |
| 414 | } |
| 415 | } |
| 416 | switch (get_line(buf, sizeof(buf))) { |
| 417 | case 0: |
| 418 | return (0); |
| 419 | case 1: |
| 420 | return (1); |
| 421 | default: |
| 422 | return (checkend(buf, "end", "no \"end\" line")); |
| 423 | } |
| 424 | } |
| 425 | |
| 426 | static int |
| 427 | base64_decode(void) |
| 428 | { |
| 429 | int n; |
| 430 | char inbuf[PATH_MAX1024]; |
| 431 | unsigned char outbuf[PATH_MAX1024 * 4]; |
| 432 | |
| 433 | for (;;) { |
| 434 | switch (get_line(inbuf, sizeof(inbuf))) { |
| 435 | case 0: |
| 436 | return (0); |
| 437 | case 1: |
| 438 | return (1); |
| 439 | } |
| 440 | n = b64_pton__b64_pton(inbuf, outbuf, sizeof(outbuf)); |
| 441 | if (n < 0) |
| 442 | break; |
| 443 | fwrite(outbuf, 1, n, outfp); |
| 444 | } |
| 445 | return (checkend(inbuf, "====", |
| 446 | "error decoding base64 input stream")); |
| 447 | } |
| 448 | |
| 449 | static void __dead__attribute__((__noreturn__)) |
| 450 | usage(void) |
| 451 | { |
| 452 | switch (pmode) { |
| 453 | case MODE_DECODE: |
| 454 | (void)fprintf(stderr(&__sF[2]), |
| 455 | "usage: uudecode [-cimprs] [file ...]\n" |
| 456 | " uudecode [-i] -o output_file [file]\n"); |
| 457 | break; |
| 458 | case MODE_B64DECODE: |
| 459 | (void)fprintf(stderr(&__sF[2]), |
| 460 | "usage: b64decode [-ciprs] [file ...]\n" |
| 461 | " b64decode [-i] -o output_file [file]\n"); |
| 462 | break; |
| 463 | } |
| 464 | exit(1); |
| 465 | } |