Commit | Line | Data |
---|---|---|
5c3f75ec | 1 | /* -*-c-*- |
2 | * | |
c65df279 | 3 | * $Id$ |
5c3f75ec | 4 | * |
5 | * Catcrypt data encoding | |
6 | * | |
7 | * (c) 2004 Straylight/Edgeware | |
8 | */ | |
9 | ||
45c0fd36 | 10 | /*----- Licensing notice --------------------------------------------------* |
5c3f75ec | 11 | * |
12 | * This file is part of Catacomb. | |
13 | * | |
14 | * Catacomb is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU Library General Public License as | |
16 | * published by the Free Software Foundation; either version 2 of the | |
17 | * License, or (at your option) any later version. | |
45c0fd36 | 18 | * |
5c3f75ec | 19 | * Catacomb is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU Library General Public License for more details. | |
45c0fd36 | 23 | * |
5c3f75ec | 24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free | |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, | |
27 | * MA 02111-1307, USA. | |
28 | */ | |
29 | ||
30 | /*----- Header files ------------------------------------------------------*/ | |
31 | ||
cd6eca43 MW |
32 | #define _FILE_OFFSET_BITS 64 |
33 | ||
fa54fe1e | 34 | #include <errno.h> |
5c3f75ec | 35 | #include <stdio.h> |
36 | ||
37 | #include <mLib/alloc.h> | |
38 | #include <mLib/base64.h> | |
39 | #include <mLib/dstr.h> | |
fa54fe1e | 40 | #include <mLib/mdwopt.h> |
5c3f75ec | 41 | #include <mLib/report.h> |
42 | #include <mLib/sub.h> | |
43 | ||
44 | #include "cc.h" | |
45 | ||
fa54fe1e | 46 | typedef int encbdryp(const char *, void *); |
47 | ||
5c3f75ec | 48 | /*----- Main code ---------------------------------------------------------*/ |
49 | ||
50 | /* --- Binary --- */ | |
51 | ||
fa54fe1e | 52 | static enc *bin_encinit(FILE *fp, const char *msg) |
53 | { enc *e = CREATE(enc); return (e); } | |
54 | static enc *bin_decinit(FILE *fp, encbdryp *func, void *p) | |
5c3f75ec | 55 | { enc *e = CREATE(enc); return (e); } |
56 | ||
57 | static int bin_read(enc *e, void *p, size_t sz) | |
58 | { | |
59 | size_t n; | |
45c0fd36 | 60 | |
5c3f75ec | 61 | if (!sz) return (0); |
62 | n = fread(p, 1, sz, e->fp); | |
63 | if (!n || ferror(e->fp)) return (-1); | |
64 | return (n); | |
65 | } | |
66 | ||
67 | static int bin_write(enc *e, const void *p, size_t sz) | |
68 | { if (sz && fwrite(p, 1, sz, e->fp) < sz) return (-1); return (0); } | |
69 | ||
70 | static int bin_done(enc *e) { return (0); } | |
71 | ||
72 | static void bin_destroy(enc *e) { DESTROY(e); } | |
73 | ||
74 | /* --- PEM --- */ | |
75 | ||
76 | typedef struct pem_encctx { | |
77 | enc e; | |
78 | char *msg; | |
79 | unsigned f; | |
80 | base64_ctx b; | |
81 | dstr d; | |
82 | size_t n; | |
83 | #define PEMF_NL 1u | |
84 | #define PEMF_EOF 2u | |
85 | } pem_encctx; | |
86 | ||
87 | static enc *pem_encinit(FILE *fp, const char *msg) | |
88 | { | |
89 | pem_encctx *pe = CREATE(pem_encctx); | |
90 | base64_init(&pe->b); | |
91 | fprintf(fp, "-----BEGIN %s-----\n", msg); | |
92 | pe->msg = xstrdup(msg); | |
93 | dstr_create(&pe->d); | |
94 | pe->n = 0; | |
95 | pe->f = 0; | |
96 | return (&pe->e); | |
97 | } | |
98 | ||
fa54fe1e | 99 | int checkbdry(const char *b, void *p) { return (!p || strcmp(b, p) == 0); } |
100 | ||
101 | static enc *pem_decinit(FILE *fp, encbdryp *func, void *p) | |
5c3f75ec | 102 | { |
103 | char buf[128]; | |
104 | int i, d; | |
105 | pem_encctx *pe; | |
106 | int ch; | |
107 | ||
108 | /* --- Go until I find a newline and `-----' --- */ | |
109 | ||
110 | top: | |
111 | d = 0; | |
112 | for (;;) { | |
113 | if ((ch = getc(fp)) == EOF) goto fail; | |
114 | switch (ch) { | |
115 | case '\n': d = 0; break; | |
116 | case '-': if (d >= 0) { d++; if (d == 5) goto banner; }; break; | |
117 | default: d = -1; break; | |
118 | } | |
119 | } | |
120 | ||
121 | /* --- See what the banner looks like --- */ | |
122 | ||
123 | banner: | |
124 | i = d = 0; | |
125 | for (;;) { | |
126 | if ((ch = getc(fp)) == EOF) goto fail; | |
127 | if (ch == '-') { d++; continue; } | |
128 | if (ch == '\n') break; | |
129 | if (i + d + 1 >= sizeof(buf)) goto top; | |
130 | while (d) { buf[i++] = '-'; d--; } | |
131 | buf[i++] = ch; | |
132 | } | |
133 | buf[i] = 0; | |
134 | ||
135 | /* --- Check we have the right framing --- */ | |
136 | ||
137 | if (d != 5) goto top; | |
fa54fe1e | 138 | if (strncmp(buf, "BEGIN ", 6) != 0 || (func && !func(buf + 6, p))) |
5c3f75ec | 139 | goto top; |
140 | ||
141 | /* --- Ready --- */ | |
142 | ||
143 | pe = CREATE(pem_encctx); | |
144 | base64_init(&pe->b); | |
145 | pe->msg = xstrdup(buf + 6); | |
146 | dstr_create(&pe->d); | |
147 | pe->n = 0; | |
148 | pe->f = PEMF_NL; | |
149 | return (&pe->e); | |
150 | ||
151 | /* --- Failed --- */ | |
152 | ||
153 | fail: | |
154 | die(EXIT_FAILURE, "initial encapsulation boundary not found"); | |
155 | return (0); | |
156 | } | |
157 | ||
158 | #define PEM_CHUNKSZ 4096 | |
159 | ||
160 | static int pem_read(enc *e, void *p, size_t sz) | |
161 | { | |
162 | pem_encctx *pe = (pem_encctx *)e; | |
163 | char buf[PEM_CHUNKSZ]; | |
164 | char *pp = p; | |
165 | int ch; | |
166 | size_t n; | |
167 | int rc = 0; | |
168 | ||
169 | for (;;) { | |
170 | n = pe->d.len - pe->n; | |
171 | if (n > sz) n = sz; | |
172 | memcpy(pp, pe->d.buf + pe->n, n); | |
173 | pe->n += n; | |
174 | pp += n; | |
175 | rc += n; | |
176 | sz -= n; | |
177 | if (!sz) break; | |
178 | if (pe->f & PEMF_EOF) return (rc ? rc : -1); | |
179 | dstr_reset(&pe->d); | |
180 | n = 0; | |
181 | for (;;) { | |
182 | if ((ch = getc(pe->e.fp)) == EOF) return (-1); | |
183 | if ((pe->f & PEMF_NL) && ch == '-') { | |
184 | ungetc(ch, pe->e.fp); | |
185 | pe->f |= PEMF_EOF; | |
186 | break; | |
187 | } | |
188 | if (ch == '\n') { pe->f |= PEMF_NL; continue; } | |
189 | pe->f &= ~PEMF_NL; | |
190 | buf[n++] = ch; | |
191 | if (n >= PEM_CHUNKSZ) break; | |
192 | } | |
193 | if (n) | |
194 | base64_decode(&pe->b, buf, n, &pe->d); | |
195 | if (pe->f & PEMF_EOF) | |
196 | base64_decode(&pe->b, 0, 0, &pe->d); | |
197 | pe->n = 0; | |
198 | } | |
199 | return (rc); | |
200 | } | |
201 | ||
202 | static int pem_write(enc *e, const void *p, size_t sz) | |
203 | { | |
204 | pem_encctx *pe = (pem_encctx *)e; | |
205 | const char *pp = p; | |
206 | size_t n; | |
207 | ||
208 | while (sz) { | |
209 | n = PEM_CHUNKSZ; | |
210 | if (n > sz) n = sz; | |
211 | dstr_reset(&pe->d); | |
212 | base64_encode(&pe->b, pp, n, &pe->d); | |
213 | if (fwrite(pe->d.buf, 1, pe->d.len, pe->e.fp) < pe->d.len) | |
214 | return (-1); | |
215 | pp += n; | |
216 | sz -= n; | |
217 | } | |
218 | return (0); | |
219 | } | |
220 | ||
221 | static int pem_encdone(enc *e) | |
222 | { | |
223 | pem_encctx *pe = (pem_encctx *)e; | |
224 | dstr_reset(&pe->d); | |
225 | base64_encode(&pe->b, 0, 0, &pe->d); | |
226 | if (fwrite(pe->d.buf, 1, pe->d.len, pe->e.fp) < pe->d.len) | |
227 | return (-1); | |
228 | if (pe->b.lnlen) fputc('\n', pe->e.fp); | |
229 | fprintf(pe->e.fp, "-----END %s-----\n", pe->msg); | |
230 | return (0); | |
231 | } | |
232 | ||
233 | static int pem_decdone(enc *e) | |
234 | { | |
235 | pem_encctx *pe = (pem_encctx *)e; | |
236 | char buf[128]; | |
237 | int i, d; | |
238 | int ch; | |
239 | ||
240 | for (d = 0; d < 5; d++) | |
241 | if ((ch = getc(pe->e.fp)) != '-') goto fail; | |
242 | i = d = 0; | |
243 | for (;;) { | |
244 | if ((ch = getc(pe->e.fp)) == EOF) goto fail; | |
245 | if (ch == '-') { d++; continue; } | |
246 | if (ch == '\n') break; | |
247 | if (i + d + 1 >= sizeof(buf)) goto fail; | |
248 | while (d) { buf[i++] = '-'; d--; } | |
249 | buf[i++] = ch; | |
250 | } | |
251 | if (d != 5) goto fail; | |
252 | buf[i] = 0; | |
253 | if (strncmp(buf, "END ", 4) != 0 || strcmp(buf + 4, pe->msg) != 0) | |
254 | goto fail; | |
255 | return (0); | |
256 | ||
257 | fail: | |
258 | die(EXIT_FAILURE, "final encapsulation boundary not found"); | |
259 | return (-1); | |
260 | } | |
261 | ||
262 | static void pem_destroy(enc *e) | |
263 | { | |
264 | pem_encctx *pe = (pem_encctx *)e; | |
265 | dstr_destroy(&pe->d); | |
266 | xfree(pe->msg); | |
267 | DESTROY(pe); | |
268 | } | |
269 | ||
270 | /* --- Encoder table --- */ | |
271 | ||
c65df279 | 272 | const encops enctab[] = { |
cd6eca43 | 273 | { "binary", "rb", "wb", 1, 1, |
fa54fe1e | 274 | bin_encinit, bin_decinit, |
5c3f75ec | 275 | bin_read, bin_write, |
276 | bin_done, bin_done, | |
277 | bin_destroy }, | |
cd6eca43 | 278 | { "pem", "r", "w", 3, 4, |
5c3f75ec | 279 | pem_encinit, pem_decinit, |
280 | pem_read, pem_write, | |
281 | pem_encdone, pem_decdone, | |
282 | pem_destroy }, | |
283 | { 0 } | |
45c0fd36 | 284 | }; |
5c3f75ec | 285 | |
286 | /* --- @getenc@ --- * | |
287 | * | |
288 | * Arguments: @const char *enc@ = name of wanted encoding | |
289 | * | |
290 | * Returns: Pointer to encoder operations. | |
291 | * | |
292 | * Use: Finds a named encoder or decoder. | |
293 | */ | |
294 | ||
295 | const encops *getenc(const char *enc) | |
296 | { | |
297 | const encops *eo; | |
298 | ||
299 | for (eo = enctab; eo->name; eo++) { | |
300 | if (strcmp(eo->name, enc) == 0) | |
301 | goto e_found; | |
302 | } | |
303 | die(EXIT_FAILURE, "couldn't find encoding `%s'", enc); | |
304 | e_found: | |
305 | return (eo); | |
306 | } | |
307 | ||
308 | /* --- @initenc@ --- * | |
309 | * | |
310 | * Arguments: @const encops *eo@ = operations (from @getenc@) | |
311 | * @FILE *fp@ = file handle to attach | |
312 | * @const char *msg@ = banner message | |
5c3f75ec | 313 | * |
314 | * Returns: The encoder object. | |
315 | * | |
316 | * Use: Initializes an encoder. | |
317 | */ | |
318 | ||
fa54fe1e | 319 | enc *initenc(const encops *eo, FILE *fp, const char *msg) |
5c3f75ec | 320 | { |
fa54fe1e | 321 | enc *e = eo->initenc(fp, msg); |
5c3f75ec | 322 | e->ops = eo; |
323 | e->fp = fp; | |
45c0fd36 | 324 | return (e); |
5c3f75ec | 325 | } |
326 | ||
fa54fe1e | 327 | /* --- @initdec@ --- * |
328 | * | |
329 | * Arguments: @const encops *eo@ = operations (from @getenc@) | |
330 | * @FILE *fp@ = file handle to attach | |
331 | * @int (*func)(const char *, void *)@ = banner check function | |
332 | * @void *p@ = argument for @func@ | |
333 | * | |
334 | * Returns: The encoder object. | |
335 | * | |
336 | * Use: Initializes an encoder. | |
337 | */ | |
338 | ||
339 | enc *initdec(const encops *eo, FILE *fp, | |
340 | int (*func)(const char *, void *), void *p) | |
341 | { | |
342 | enc *e = eo->initdec(fp, func, p); | |
343 | e->ops = eo; | |
344 | e->fp = fp; | |
345 | return (e); | |
346 | } | |
347 | ||
5c3f75ec | 348 | /* --- @freeenc@ --- * |
349 | * | |
350 | * Arguments: @enc *e@ = encoder object | |
351 | * | |
352 | * Returns: --- | |
353 | * | |
354 | * Use: Frees an encoder object. | |
355 | */ | |
356 | ||
357 | void freeenc(enc *e) { e->ops->destroy(e); } | |
358 | ||
fa54fe1e | 359 | /*----- Encoding and decoding commands ------------------------------------*/ |
360 | ||
361 | int cmd_encode(int argc, char *argv[]) | |
362 | { | |
cd6eca43 | 363 | const char *fn, *of = 0; |
fa54fe1e | 364 | FILE *ofp = 0; |
365 | FILE *fp = 0; | |
366 | const char *ef = "binary"; | |
367 | const char *bd = "MESSAGE"; | |
cd6eca43 | 368 | fprogress ff; |
fa54fe1e | 369 | int i; |
370 | size_t n; | |
371 | char buf[4096]; | |
372 | unsigned f = 0; | |
373 | const encops *eo; | |
374 | enc *e; | |
375 | ||
376 | #define f_bogus 1u | |
cd6eca43 | 377 | #define f_progress 2u |
fa54fe1e | 378 | |
379 | for (;;) { | |
380 | static const struct option opt[] = { | |
45c0fd36 MW |
381 | { "format", OPTF_ARGREQ, 0, 'f' }, |
382 | { "boundary", OPTF_ARGREQ, 0, 'b' }, | |
383 | { "output", OPTF_ARGREQ, 0, 'o' }, | |
cd6eca43 | 384 | { "progress", 0, 0, 'p' }, |
fa54fe1e | 385 | { 0, 0, 0, 0 } |
386 | }; | |
cd6eca43 | 387 | i = mdwopt(argc, argv, "f:b:o:p", opt, 0, 0, 0); |
fa54fe1e | 388 | if (i < 0) break; |
389 | switch (i) { | |
390 | case 'f': ef = optarg; break; | |
391 | case 'b': bd = optarg; break; | |
392 | case 'o': of = optarg; break; | |
cd6eca43 | 393 | case 'p': f |= f_progress; break; |
fa54fe1e | 394 | default: f |= f_bogus; break; |
395 | } | |
396 | } | |
397 | if (argc - optind > 1 || (f & f_bogus)) | |
398 | die(EXIT_FAILURE, "Usage: encode [-OPTIONS] [FILE]"); | |
399 | ||
400 | if ((eo = getenc(ef)) == 0) | |
401 | die(EXIT_FAILURE, "encoding `%s' not found", ef); | |
402 | ||
cd6eca43 MW |
403 | fn = optind < argc ? argv[optind++] : "-"; |
404 | if (strcmp(fn, "-") == 0) | |
fa54fe1e | 405 | fp = stdin; |
cd6eca43 | 406 | else if ((fp = fopen(fn, "rb")) == 0) { |
fa54fe1e | 407 | die(EXIT_FAILURE, "couldn't open file `%s': %s", |
cd6eca43 MW |
408 | fn, strerror(errno)); |
409 | } | |
fa54fe1e | 410 | |
411 | if (!of || strcmp(of, "-") == 0) | |
412 | ofp = stdout; | |
413 | else if ((ofp = fopen(of, eo->wmode)) == 0) { | |
414 | die(EXIT_FAILURE, "couldn't open file `%s' for output: %s", | |
415 | ofp, strerror(errno)); | |
416 | } | |
417 | ||
418 | e = initenc(eo, ofp, bd); | |
419 | ||
cd6eca43 MW |
420 | if (f & f_progress) { |
421 | if (fprogress_init(&ff, fn, fp)) { | |
422 | die(EXIT_FAILURE, "failed to initialize progress display: %s", | |
423 | strerror(errno)); | |
424 | } | |
425 | } | |
426 | ||
fa54fe1e | 427 | do { |
428 | n = fread(buf, 1, sizeof(buf), fp); | |
cd6eca43 MW |
429 | if (f & f_progress) fprogress_update(&ff, n); |
430 | if (e->ops->write(e, buf, n)) { | |
431 | if (f & f_progress) fprogress_done(&ff); | |
fa54fe1e | 432 | die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); |
cd6eca43 | 433 | } |
fa54fe1e | 434 | } while (n == sizeof(buf)); |
cd6eca43 | 435 | if (f & f_progress) fprogress_done(&ff); |
fa54fe1e | 436 | e->ops->encdone(e); |
437 | freeenc(e); | |
438 | return (0); | |
439 | ||
440 | #undef f_bogus | |
cd6eca43 | 441 | #undef f_progress |
fa54fe1e | 442 | } |
443 | ||
444 | int cmd_decode(int argc, char *argv[]) | |
445 | { | |
cd6eca43 | 446 | const char *fn, *of = 0; |
fa54fe1e | 447 | FILE *ofp = 0; |
448 | FILE *fp = 0; | |
449 | const char *ef = "binary"; | |
450 | const char *bd = 0; | |
cd6eca43 | 451 | fprogress ff; |
fa54fe1e | 452 | int i; |
453 | char buf[4096]; | |
454 | unsigned f = 0; | |
455 | const encops *eo; | |
456 | enc *e; | |
457 | ||
458 | #define f_bogus 1u | |
cd6eca43 | 459 | #define f_progress 2u |
fa54fe1e | 460 | |
461 | for (;;) { | |
462 | static const struct option opt[] = { | |
45c0fd36 MW |
463 | { "format", OPTF_ARGREQ, 0, 'f' }, |
464 | { "boundary", OPTF_ARGREQ, 0, 'b' }, | |
465 | { "output", OPTF_ARGREQ, 0, 'o' }, | |
cd6eca43 | 466 | { "progress", 0, 0, 'p' }, |
fa54fe1e | 467 | { 0, 0, 0, 0 } |
468 | }; | |
cd6eca43 | 469 | i = mdwopt(argc, argv, "f:b:o:p", opt, 0, 0, 0); |
fa54fe1e | 470 | if (i < 0) break; |
471 | switch (i) { | |
472 | case 'f': ef = optarg; break; | |
473 | case 'b': bd = optarg; break; | |
474 | case 'o': of = optarg; break; | |
cd6eca43 | 475 | case 'p': f |= f_progress; break; |
fa54fe1e | 476 | default: f |= f_bogus; break; |
477 | } | |
478 | } | |
479 | if (argc - optind > 1 || (f & f_bogus)) | |
480 | die(EXIT_FAILURE, "Usage: decode [-OPTIONS] [FILE]"); | |
481 | ||
482 | if ((eo = getenc(ef)) == 0) | |
483 | die(EXIT_FAILURE, "encoding `%s' not found", ef); | |
484 | ||
cd6eca43 MW |
485 | fn = optind < argc ? argv[optind++] : "-"; |
486 | if (strcmp(fn, "-") == 0) | |
fa54fe1e | 487 | fp = stdin; |
cd6eca43 | 488 | else if ((fp = fopen(fn, eo->rmode)) == 0) { |
fa54fe1e | 489 | die(EXIT_FAILURE, "couldn't open file `%s': %s", |
cd6eca43 MW |
490 | fn, strerror(errno)); |
491 | } | |
fa54fe1e | 492 | |
493 | if (!of || strcmp(of, "-") == 0) | |
494 | ofp = stdout; | |
495 | else if ((ofp = fopen(of, "wb")) == 0) { | |
496 | die(EXIT_FAILURE, "couldn't open file `%s' for output: %s", | |
497 | ofp, strerror(errno)); | |
498 | } | |
499 | ||
500 | e = initdec(eo, fp, checkbdry, (/*unconst*/ void *)bd); | |
501 | ||
cd6eca43 MW |
502 | if (f & f_progress) { |
503 | if (fprogress_init(&ff, fn, fp)) { | |
504 | die(EXIT_FAILURE, "failed to initialize progress display: %s", | |
505 | strerror(errno)); | |
506 | } | |
507 | } | |
508 | ||
fa54fe1e | 509 | do { |
cd6eca43 MW |
510 | if ((i = e->ops->read(e, buf, sizeof(buf))) < 0) { |
511 | if (f & f_progress) fprogress_done(&ff); | |
fa54fe1e | 512 | die(EXIT_FAILURE, "error reading input: %s", strerror(errno)); |
cd6eca43 MW |
513 | } |
514 | if (f & f_progress) | |
515 | fprogress_update(&ff, i*e->ops->ncook/e->ops->nraw); | |
516 | if (fwrite(buf, 1, i, ofp) < i) { | |
517 | if (f & f_progress) fprogress_done(&ff); | |
fa54fe1e | 518 | die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); |
cd6eca43 | 519 | } |
fa54fe1e | 520 | } while (i == sizeof(buf)); |
521 | e->ops->decdone(e); | |
cd6eca43 | 522 | if (f & f_progress) fprogress_done(&ff); |
fa54fe1e | 523 | freeenc(e); |
524 | return (0); | |
525 | ||
526 | #undef f_bogus | |
cd6eca43 | 527 | #undef f_progress |
fa54fe1e | 528 | } |
529 | ||
5c3f75ec | 530 | /*----- That's all, folks -------------------------------------------------*/ |