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 | } |