| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * Common functions for hashing utilities |
| 4 | * |
| 5 | * (c) 2011 Straylight/Edgeware |
| 6 | */ |
| 7 | |
| 8 | /*----- Licensing notice --------------------------------------------------* |
| 9 | * |
| 10 | * This file is part of Catacomb. |
| 11 | * |
| 12 | * Catacomb is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU Library General Public License as |
| 14 | * published by the Free Software Foundation; either version 2 of the |
| 15 | * License, or (at your option) any later version. |
| 16 | * |
| 17 | * Catacomb is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU Library General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU Library General Public |
| 23 | * License along with Catacomb; if not, write to the Free |
| 24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 25 | * MA 02111-1307, USA. |
| 26 | */ |
| 27 | |
| 28 | /*----- Header files ------------------------------------------------------*/ |
| 29 | |
| 30 | #define _FILE_OFFSET_BITS 64 |
| 31 | |
| 32 | #include "config.h" |
| 33 | |
| 34 | #include <ctype.h> |
| 35 | #include <stdio.h> |
| 36 | #include <stdlib.h> |
| 37 | #include <string.h> |
| 38 | |
| 39 | #include <mLib/dstr.h> |
| 40 | #include <mLib/str.h> |
| 41 | |
| 42 | #include <mLib/hex.h> |
| 43 | #include <mLib/base32.h> |
| 44 | #include <mLib/base64.h> |
| 45 | |
| 46 | #include "ghash.h" |
| 47 | #include "cc.h" |
| 48 | |
| 49 | /*----- Encoding and decoding ---------------------------------------------*/ |
| 50 | |
| 51 | /* --- Hex encoding --- */ |
| 52 | |
| 53 | static void puthex(const octet *buf, size_t sz, FILE *fp) |
| 54 | { |
| 55 | while (sz) { |
| 56 | fprintf(fp, "%02x", *buf++); |
| 57 | sz--; |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | static size_t gethex(const char *p, octet *q, size_t sz, char **pp) |
| 62 | { |
| 63 | size_t i = 0; |
| 64 | while (sz > 0 && |
| 65 | isxdigit((unsigned char)p[0]) && |
| 66 | isxdigit((unsigned char)p[1])) { |
| 67 | char buf[3]; |
| 68 | buf[0] = p[0]; |
| 69 | buf[1] = p[1]; |
| 70 | buf[2] = 0; |
| 71 | *q++ = strtoul(buf, 0, 16); |
| 72 | sz--; |
| 73 | p += 2; |
| 74 | i++; |
| 75 | } |
| 76 | if (pp) |
| 77 | *pp = (char *)p; |
| 78 | return (i); |
| 79 | } |
| 80 | |
| 81 | /* --- Base64 encoding --- */ |
| 82 | |
| 83 | static void putbase64(const octet *buf, size_t sz, FILE *fp) |
| 84 | { |
| 85 | base64_ctx b; |
| 86 | dstr d = DSTR_INIT; |
| 87 | |
| 88 | base64_init(&b); |
| 89 | b.indent = ""; |
| 90 | b.maxline = 0; |
| 91 | base64_encode(&b, buf, sz, &d); |
| 92 | base64_encode(&b, 0, 0, &d); |
| 93 | dstr_write(&d, fp); |
| 94 | dstr_destroy(&d); |
| 95 | } |
| 96 | |
| 97 | static size_t getbase64(const char *p, octet *q, size_t sz, char **pp) |
| 98 | { |
| 99 | base64_ctx b; |
| 100 | dstr d = DSTR_INIT; |
| 101 | size_t n = strlen(p); |
| 102 | |
| 103 | base64_init(&b); |
| 104 | base64_decode(&b, p, n, &d); |
| 105 | if (pp) *pp = (/*unconst*/ char *)p + n; |
| 106 | base64_decode(&b, 0, 0, &d); |
| 107 | assert(d.len <= sz); |
| 108 | memcpy(q, d.buf, sz); |
| 109 | n = d.len; |
| 110 | dstr_destroy(&d); |
| 111 | return (n); |
| 112 | } |
| 113 | |
| 114 | /* --- Base32 encoding --- */ |
| 115 | |
| 116 | static void putbase32(const octet *buf, size_t sz, FILE *fp) |
| 117 | { |
| 118 | base32_ctx b; |
| 119 | dstr d = DSTR_INIT; |
| 120 | |
| 121 | base32_init(&b); |
| 122 | b.indent = ""; |
| 123 | b.maxline = 0; |
| 124 | base32_encode(&b, buf, sz, &d); |
| 125 | base32_encode(&b, 0, 0, &d); |
| 126 | dstr_write(&d, fp); |
| 127 | dstr_destroy(&d); |
| 128 | } |
| 129 | |
| 130 | static size_t getbase32(const char *p, octet *q, size_t sz, char **pp) |
| 131 | { |
| 132 | base32_ctx b; |
| 133 | dstr d = DSTR_INIT; |
| 134 | size_t n = strlen(p); |
| 135 | |
| 136 | base32_init(&b); |
| 137 | base32_decode(&b, p, n, &d); |
| 138 | if (pp) *pp = (/*unconst*/ char *)p + n; |
| 139 | base32_decode(&b, 0, 0, &d); |
| 140 | assert(d.len <= sz); |
| 141 | memcpy(q, d.buf, sz); |
| 142 | n = d.len; |
| 143 | dstr_destroy(&d); |
| 144 | return (n); |
| 145 | } |
| 146 | |
| 147 | /* --- Table --- */ |
| 148 | |
| 149 | const encodeops encodingtab[] = { |
| 150 | #define TAB(tag, name) { #name, put##name, get##name }, |
| 151 | ENCODINGS(TAB) |
| 152 | #undef TAB |
| 153 | { 0, 0, 0 } |
| 154 | }; |
| 155 | |
| 156 | const encodeops *getencoding(const char *ename) |
| 157 | { |
| 158 | const encodeops *e; |
| 159 | |
| 160 | for (e = encodingtab; e->name; e++) { |
| 161 | if (strcmp(ename, e->name) == 0) |
| 162 | return (e); |
| 163 | } |
| 164 | return (0); |
| 165 | } |
| 166 | |
| 167 | /*----- File hashing ------------------------------------------------------*/ |
| 168 | |
| 169 | /* --- @gethash@ --- * |
| 170 | * |
| 171 | * Arguments: @const char *name@ = pointer to name string |
| 172 | * |
| 173 | * Returns: Pointer to appropriate hash class. |
| 174 | * |
| 175 | * Use: Chooses a hash function by name. |
| 176 | */ |
| 177 | |
| 178 | const gchash *gethash(const char *name) |
| 179 | { |
| 180 | const gchash *const *g, *gg = 0; |
| 181 | size_t sz = strlen(name); |
| 182 | for (g = ghashtab; *g; g++) { |
| 183 | if (strncmp(name, (*g)->name, sz) == 0) { |
| 184 | if ((*g)->name[sz] == 0) { |
| 185 | gg = *g; |
| 186 | break; |
| 187 | } else if (gg) |
| 188 | return (0); |
| 189 | else |
| 190 | gg = *g; |
| 191 | } |
| 192 | } |
| 193 | return (gg); |
| 194 | } |
| 195 | |
| 196 | /* --- @fhash@ --- * |
| 197 | * |
| 198 | * Arguments: @const gchash *gch@ = pointer to hash function to use |
| 199 | * @unsigned f@ = flags to set |
| 200 | * @const char *file@ = file name to be hashed (null for stdin) |
| 201 | * @void *buf@ = pointer to hash output buffer |
| 202 | * |
| 203 | * Returns: Zero if it worked, nonzero on error. |
| 204 | * |
| 205 | * Use: Hashes a file. |
| 206 | */ |
| 207 | |
| 208 | int fhash(const gchash *gch, unsigned f, const char *file, void *buf) |
| 209 | { |
| 210 | FILE *fp; |
| 211 | char fbuf[1024 * 128]; |
| 212 | size_t sz; |
| 213 | ghash *h; |
| 214 | int rc = 0; |
| 215 | fprogress ff; |
| 216 | |
| 217 | if (!file || strcmp(file, "-") == 0) |
| 218 | fp = stdin; |
| 219 | else if ((fp = fopen(file, f & FHF_BINARY ? "rb" : "r")) == 0) |
| 220 | return (-1); |
| 221 | |
| 222 | if (f & FHF_PROGRESS) { |
| 223 | if (fprogress_init(&ff, file, fp)) return (-1); |
| 224 | } |
| 225 | |
| 226 | h = GH_INIT(gch); |
| 227 | while ((sz = fread(fbuf, 1, sizeof(fbuf), fp)) > 0) { |
| 228 | GH_HASH(h, fbuf, sz); |
| 229 | if (f & FHF_PROGRESS) fprogress_update(&ff, sz); |
| 230 | } |
| 231 | if (ferror(fp)) rc = -1; |
| 232 | if (fp != stdin) fclose(fp); |
| 233 | if (f & FHF_PROGRESS) fprogress_done(&ff); |
| 234 | GH_DONE(h, buf); |
| 235 | GH_DESTROY(h); |
| 236 | return (rc); |
| 237 | } |
| 238 | |
| 239 | /* --- @hfparse@ --- * |
| 240 | * |
| 241 | * Arguments: @hfpctx *hfp@ = pointer to the context structure |
| 242 | * |
| 243 | * Returns: A code indicating what happened. |
| 244 | * |
| 245 | * Use: Parses a line from the input file. |
| 246 | */ |
| 247 | |
| 248 | int hfparse(hfpctx *hfp) |
| 249 | { |
| 250 | char *p, *q; |
| 251 | const gchash *gch; |
| 252 | const encodeops *ee; |
| 253 | dstr *d = hfp->dline; |
| 254 | size_t hsz; |
| 255 | |
| 256 | /* --- Fetch the input line and get ready to parse --- */ |
| 257 | |
| 258 | DRESET(d); |
| 259 | if (dstr_putline(d, hfp->fp) == EOF) return (HF_EOF); |
| 260 | p = d->buf; |
| 261 | |
| 262 | /* --- Parse magic comments --- */ |
| 263 | |
| 264 | if (*p == '#') { |
| 265 | p++; |
| 266 | if ((q = str_getword(&p)) == 0) return (HF_BAD); |
| 267 | if (strcmp(q, "hash") == 0) { |
| 268 | if ((q = str_getword(&p)) == 0) return (HF_BAD); |
| 269 | if ((gch = gethash(q)) == 0) return (HF_BAD); |
| 270 | hfp->gch = gch; |
| 271 | return (HF_HASH); |
| 272 | } else if (strcmp(q, "encoding") == 0) { |
| 273 | if ((q = str_getword(&p)) == 0) return (HF_BAD); |
| 274 | if ((ee = getencoding(q)) == 0) return (HF_BAD); |
| 275 | hfp->ee = ee; |
| 276 | return (HF_ENC); |
| 277 | } else if (strcmp(q, "escape") == 0) { |
| 278 | hfp->f |= HFF_ESCAPE; |
| 279 | return (HF_ESC); |
| 280 | } |
| 281 | return (HF_BAD); |
| 282 | } |
| 283 | |
| 284 | /* --- Otherwise it's a file line --- */ |
| 285 | |
| 286 | q = p; |
| 287 | while (*p && *p != ' ') p++; |
| 288 | if (!*p) return (HF_BAD); |
| 289 | *p++ = 0; |
| 290 | hsz = hfp->gch->hashsz; |
| 291 | if (hfp->ee->get(q, hfp->hbuf, hsz, 0) < hsz) return (HF_BAD); |
| 292 | switch (*p) { |
| 293 | case '*': hfp->f |= FHF_BINARY; break; |
| 294 | case ' ': hfp->f &= ~FHF_BINARY; break; |
| 295 | default: return (HF_BAD); |
| 296 | } |
| 297 | p++; |
| 298 | |
| 299 | DRESET(hfp->dfile); |
| 300 | if (hfp->f & HFF_ESCAPE) |
| 301 | getstring(&p, hfp->dfile, GSF_STRING); |
| 302 | else { |
| 303 | dstr_putm(hfp->dfile, p, d->len - (p - d->buf)); |
| 304 | dstr_putz(hfp->dfile); |
| 305 | } |
| 306 | |
| 307 | return (HF_FILE); |
| 308 | } |
| 309 | |
| 310 | /*----- String I/O --------------------------------------------------------*/ |
| 311 | |
| 312 | /* --- @getstring@ --- * |
| 313 | * |
| 314 | * Arguments: @void *in@ = input source |
| 315 | * @dstr *d@ = destination string |
| 316 | * @unsigned f@ = input flags |
| 317 | * |
| 318 | * Returns: Zero if OK, nonzero on end-of-file. |
| 319 | * |
| 320 | * Use: Reads a filename (or something similar) from a stream. |
| 321 | */ |
| 322 | |
| 323 | static int nextch_file(void *in) |
| 324 | { FILE *fp = in; return (getc(fp)); } |
| 325 | |
| 326 | static int nextch_string(void *in) |
| 327 | { const unsigned char **p = in; return (*(*p)++); } |
| 328 | |
| 329 | int getstring(void *in, dstr *d, unsigned f) |
| 330 | { |
| 331 | int ch; |
| 332 | int eofch = (f & GSF_STRING) ? 0 : EOF; |
| 333 | int (*nextch)(void *) = (f & GSF_STRING) ? nextch_string : nextch_file; |
| 334 | int q = 0; |
| 335 | |
| 336 | /* --- Raw: just read exactly what's written up to a null byte --- */ |
| 337 | |
| 338 | if (f & GSF_RAW) { |
| 339 | if ((ch = nextch(in)) == eofch) |
| 340 | return (EOF); |
| 341 | for (;;) { |
| 342 | if (!ch) |
| 343 | break; |
| 344 | DPUTC(d, ch); |
| 345 | if ((ch = nextch(in)) == eofch) |
| 346 | break; |
| 347 | } |
| 348 | DPUTZ(d); |
| 349 | return (0); |
| 350 | } |
| 351 | |
| 352 | /* --- Skip as far as whitespace --- * |
| 353 | * |
| 354 | * Also skip past comments. |
| 355 | */ |
| 356 | |
| 357 | again: |
| 358 | ch = nextch(in); |
| 359 | while (isspace(ch)) |
| 360 | ch = nextch(in); |
| 361 | if (ch == '#') { |
| 362 | do ch = nextch(in); while (ch != '\n' && ch != eofch); |
| 363 | goto again; |
| 364 | } |
| 365 | if (ch == eofch) |
| 366 | return (EOF); |
| 367 | |
| 368 | /* --- If the character is a quote then read a quoted string --- */ |
| 369 | |
| 370 | switch (ch) { |
| 371 | case '`': |
| 372 | ch = '\''; |
| 373 | case '\'': |
| 374 | case '\"': |
| 375 | q = ch; |
| 376 | ch = nextch(in); |
| 377 | break; |
| 378 | } |
| 379 | |
| 380 | /* --- Now read all sorts of interesting things --- */ |
| 381 | |
| 382 | for (;;) { |
| 383 | |
| 384 | /* --- Handle an escaped thing --- */ |
| 385 | |
| 386 | if (ch == '\\') { |
| 387 | ch = nextch(in); |
| 388 | if (ch == eofch) |
| 389 | break; |
| 390 | switch (ch) { |
| 391 | case 'a': ch = '\a'; break; |
| 392 | case 'b': ch = '\b'; break; |
| 393 | case 'f': ch = '\f'; break; |
| 394 | case 'n': ch = '\n'; break; |
| 395 | case 'r': ch = '\r'; break; |
| 396 | case 't': ch = '\t'; break; |
| 397 | case 'v': ch = '\v'; break; |
| 398 | } |
| 399 | DPUTC(d, ch); |
| 400 | ch = nextch(in); |
| 401 | continue; |
| 402 | } |
| 403 | |
| 404 | /* --- If it's a quote or some other end marker then stop --- */ |
| 405 | |
| 406 | if (ch == q) |
| 407 | break; |
| 408 | if (!q && isspace(ch)) |
| 409 | break; |
| 410 | |
| 411 | /* --- Otherwise contribute and continue --- */ |
| 412 | |
| 413 | DPUTC(d, ch); |
| 414 | if ((ch = nextch(in)) == eofch) |
| 415 | break; |
| 416 | } |
| 417 | |
| 418 | /* --- Done --- */ |
| 419 | |
| 420 | DPUTZ(d); |
| 421 | return (0); |
| 422 | } |
| 423 | |
| 424 | /* --- @putstring@ --- * |
| 425 | * |
| 426 | * Arguments: @FILE *fp@ = stream to write on |
| 427 | * @const char *p@ = pointer to text |
| 428 | * @unsigned f@ = output flags |
| 429 | * |
| 430 | * Returns: --- |
| 431 | * |
| 432 | * Use: Emits a string to a stream. |
| 433 | */ |
| 434 | |
| 435 | void putstring(FILE *fp, const char *p, unsigned f) |
| 436 | { |
| 437 | size_t sz = strlen(p); |
| 438 | unsigned qq; |
| 439 | const char *q; |
| 440 | |
| 441 | /* --- Just write the string null terminated if raw --- */ |
| 442 | |
| 443 | if (f & GSF_RAW) { |
| 444 | fwrite(p, 1, sz + 1, fp); |
| 445 | return; |
| 446 | } |
| 447 | |
| 448 | /* --- Check for any dodgy characters --- */ |
| 449 | |
| 450 | qq = 0; |
| 451 | for (q = p; *q; q++) { |
| 452 | if (isspace((unsigned char)*q)) { |
| 453 | qq = '\"'; |
| 454 | break; |
| 455 | } |
| 456 | } |
| 457 | |
| 458 | if (qq) |
| 459 | putc(qq, fp); |
| 460 | |
| 461 | /* --- Emit the string --- */ |
| 462 | |
| 463 | for (q = p; *q; q++) { |
| 464 | switch (*q) { |
| 465 | case '\a': fputc('\\', fp); fputc('a', fp); break; |
| 466 | case '\b': fputc('\\', fp); fputc('b', fp); break; |
| 467 | case '\f': fputc('\\', fp); fputc('f', fp); break; |
| 468 | case '\n': fputc('\\', fp); fputc('n', fp); break; |
| 469 | case '\r': fputc('\\', fp); fputc('r', fp); break; |
| 470 | case '\t': fputc('\\', fp); fputc('t', fp); break; |
| 471 | case '\v': fputc('\\', fp); fputc('v', fp); break; |
| 472 | case '`': fputc('\\', fp); fputc('`', fp); break; |
| 473 | case '\'': fputc('\\', fp); fputc('\'', fp); break; |
| 474 | case '\"': fputc('\\', fp); fputc('\"', fp); break; |
| 475 | default: |
| 476 | putc(*q, fp); |
| 477 | break; |
| 478 | } |
| 479 | } |
| 480 | |
| 481 | /* --- Done --- */ |
| 482 | |
| 483 | if (qq) |
| 484 | putc(qq, fp); |
| 485 | } |
| 486 | |
| 487 | /*----- That's all, folks -------------------------------------------------*/ |