Annotation of embedaddon/ntp/lib/isc/base32.c, revision 1.1
1.1 ! misho 1: /*
! 2: * Copyright (C) 2008, 2009 Internet Systems Consortium, Inc. ("ISC")
! 3: *
! 4: * Permission to use, copy, modify, and/or distribute this software for any
! 5: * purpose with or without fee is hereby granted, provided that the above
! 6: * copyright notice and this permission notice appear in all copies.
! 7: *
! 8: * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
! 9: * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
! 10: * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
! 11: * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
! 12: * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
! 13: * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
! 14: * PERFORMANCE OF THIS SOFTWARE.
! 15: */
! 16:
! 17: /* $Id: base32.c,v 1.3.116.2 2009/01/18 23:47:41 tbox Exp $ */
! 18:
! 19: /*! \file */
! 20:
! 21: #include <config.h>
! 22:
! 23: #include <isc/base32.h>
! 24: #include <isc/buffer.h>
! 25: #include <isc/lex.h>
! 26: #include <isc/region.h>
! 27: #include <isc/string.h>
! 28: #include <isc/util.h>
! 29:
! 30: #define RETERR(x) do { \
! 31: isc_result_t _r = (x); \
! 32: if (_r != ISC_R_SUCCESS) \
! 33: return (_r); \
! 34: } while (0)
! 35:
! 36:
! 37: /*@{*/
! 38: /*!
! 39: * These static functions are also present in lib/dns/rdata.c. I'm not
! 40: * sure where they should go. -- bwelling
! 41: */
! 42: static isc_result_t
! 43: str_totext(const char *source, isc_buffer_t *target);
! 44:
! 45: static isc_result_t
! 46: mem_tobuffer(isc_buffer_t *target, void *base, unsigned int length);
! 47:
! 48: /*@}*/
! 49:
! 50: static const char base32[] =
! 51: "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567=abcdefghijklmnopqrstuvwxyz234567";
! 52: static const char base32hex[] =
! 53: "0123456789ABCDEFGHIJKLMNOPQRSTUV=0123456789abcdefghijklmnopqrstuv";
! 54:
! 55: static isc_result_t
! 56: base32_totext(isc_region_t *source, int wordlength, const char *wordbreak,
! 57: isc_buffer_t *target, const char base[])
! 58: {
! 59: char buf[9];
! 60: unsigned int loops = 0;
! 61:
! 62: if (wordlength >= 0 && wordlength < 8)
! 63: wordlength = 8;
! 64:
! 65: memset(buf, 0, sizeof(buf));
! 66: while (source->length > 0) {
! 67: buf[0] = base[((source->base[0]>>3)&0x1f)]; /* 5 + */
! 68: if (source->length == 1) {
! 69: buf[1] = base[(source->base[0]<<2)&0x1c];
! 70: buf[2] = buf[3] = buf[4] = '=';
! 71: buf[5] = buf[6] = buf[7] = '=';
! 72: RETERR(str_totext(buf, target));
! 73: break;
! 74: }
! 75: buf[1] = base[((source->base[0]<<2)&0x1c)| /* 3 = 8 */
! 76: ((source->base[1]>>6)&0x03)]; /* 2 + */
! 77: buf[2] = base[((source->base[1]>>1)&0x1f)]; /* 5 + */
! 78: if (source->length == 2) {
! 79: buf[3] = base[(source->base[1]<<4)&0x10];
! 80: buf[4] = buf[5] = buf[6] = buf[7] = '=';
! 81: RETERR(str_totext(buf, target));
! 82: break;
! 83: }
! 84: buf[3] = base[((source->base[1]<<4)&0x10)| /* 1 = 8 */
! 85: ((source->base[2]>>4)&0x0f)]; /* 4 + */
! 86: if (source->length == 3) {
! 87: buf[4] = base[(source->base[2]<<1)&0x1e];
! 88: buf[5] = buf[6] = buf[7] = '=';
! 89: RETERR(str_totext(buf, target));
! 90: break;
! 91: }
! 92: buf[4] = base[((source->base[2]<<1)&0x1e)| /* 4 = 8 */
! 93: ((source->base[3]>>7)&0x01)]; /* 1 + */
! 94: buf[5] = base[((source->base[3]>>2)&0x1f)]; /* 5 + */
! 95: if (source->length == 4) {
! 96: buf[6] = base[(source->base[3]<<3)&0x18];
! 97: buf[7] = '=';
! 98: RETERR(str_totext(buf, target));
! 99: break;
! 100: }
! 101: buf[6] = base[((source->base[3]<<3)&0x18)| /* 2 = 8 */
! 102: ((source->base[4]>>5)&0x07)]; /* 3 + */
! 103: buf[7] = base[source->base[4]&0x1f]; /* 5 = 8 */
! 104: RETERR(str_totext(buf, target));
! 105: isc_region_consume(source, 5);
! 106:
! 107: loops++;
! 108: if (source->length != 0 && wordlength >= 0 &&
! 109: (int)((loops + 1) * 8) >= wordlength)
! 110: {
! 111: loops = 0;
! 112: RETERR(str_totext(wordbreak, target));
! 113: }
! 114: }
! 115: return (ISC_R_SUCCESS);
! 116: }
! 117:
! 118: isc_result_t
! 119: isc_base32_totext(isc_region_t *source, int wordlength,
! 120: const char *wordbreak, isc_buffer_t *target)
! 121: {
! 122: return (base32_totext(source, wordlength, wordbreak, target, base32));
! 123: }
! 124:
! 125: isc_result_t
! 126: isc_base32hex_totext(isc_region_t *source, int wordlength,
! 127: const char *wordbreak, isc_buffer_t *target)
! 128: {
! 129: return (base32_totext(source, wordlength, wordbreak, target,
! 130: base32hex));
! 131: }
! 132:
! 133: /*%
! 134: * State of a base32 decoding process in progress.
! 135: */
! 136: typedef struct {
! 137: int length; /*%< Desired length of binary data or -1 */
! 138: isc_buffer_t *target; /*%< Buffer for resulting binary data */
! 139: int digits; /*%< Number of buffered base32 digits */
! 140: isc_boolean_t seen_end; /*%< True if "=" end marker seen */
! 141: int val[8];
! 142: const char *base; /*%< Which encoding we are using */
! 143: int seen_32; /*%< Number of significant bytes if non zero */
! 144: } base32_decode_ctx_t;
! 145:
! 146: static inline void
! 147: base32_decode_init(base32_decode_ctx_t *ctx, int length,
! 148: const char base[], isc_buffer_t *target)
! 149: {
! 150: ctx->digits = 0;
! 151: ctx->seen_end = ISC_FALSE;
! 152: ctx->seen_32 = 0;
! 153: ctx->length = length;
! 154: ctx->target = target;
! 155: ctx->base = base;
! 156: }
! 157:
! 158: static inline isc_result_t
! 159: base32_decode_char(base32_decode_ctx_t *ctx, int c) {
! 160: char *s;
! 161: unsigned int last;
! 162:
! 163: if (ctx->seen_end)
! 164: return (ISC_R_BADBASE32);
! 165: if ((s = strchr(ctx->base, c)) == NULL)
! 166: return (ISC_R_BADBASE32);
! 167: last = s - ctx->base;
! 168: /*
! 169: * Handle lower case.
! 170: */
! 171: if (last > 32)
! 172: last -= 33;
! 173: /*
! 174: * Check that padding is contiguous.
! 175: */
! 176: if (last != 32 && ctx->seen_32 != 0)
! 177: return (ISC_R_BADBASE32);
! 178: /*
! 179: * Check that padding starts at the right place and that
! 180: * bits that should be zero are.
! 181: * Record how many significant bytes in answer (seen_32).
! 182: */
! 183: if (last == 32 && ctx->seen_32 == 0)
! 184: switch (ctx->digits) {
! 185: case 0:
! 186: case 1:
! 187: return (ISC_R_BADBASE32);
! 188: case 2:
! 189: if ((ctx->val[1]&0x03) != 0)
! 190: return (ISC_R_BADBASE32);
! 191: ctx->seen_32 = 1;
! 192: break;
! 193: case 3:
! 194: return (ISC_R_BADBASE32);
! 195: case 4:
! 196: if ((ctx->val[3]&0x0f) != 0)
! 197: return (ISC_R_BADBASE32);
! 198: ctx->seen_32 = 3;
! 199: break;
! 200: case 5:
! 201: if ((ctx->val[4]&0x01) != 0)
! 202: return (ISC_R_BADBASE32);
! 203: ctx->seen_32 = 3;
! 204: break;
! 205: case 6:
! 206: return (ISC_R_BADBASE32);
! 207: case 7:
! 208: if ((ctx->val[6]&0x07) != 0)
! 209: return (ISC_R_BADBASE32);
! 210: ctx->seen_32 = 4;
! 211: break;
! 212: }
! 213: /*
! 214: * Zero fill pad values.
! 215: */
! 216: ctx->val[ctx->digits++] = (last == 32) ? 0 : last;
! 217:
! 218: if (ctx->digits == 8) {
! 219: int n = 5;
! 220: unsigned char buf[5];
! 221:
! 222: if (ctx->seen_32 != 0) {
! 223: ctx->seen_end = ISC_TRUE;
! 224: n = ctx->seen_32;
! 225: }
! 226: buf[0] = (ctx->val[0]<<3)|(ctx->val[1]>>2);
! 227: buf[1] = (ctx->val[1]<<6)|(ctx->val[2]<<1)|(ctx->val[3]>>4);
! 228: buf[2] = (ctx->val[3]<<4)|(ctx->val[4]>>1);
! 229: buf[3] = (ctx->val[4]<<7)|(ctx->val[5]<<2)|(ctx->val[6]>>3);
! 230: buf[4] = (ctx->val[6]<<5)|(ctx->val[7]);
! 231: RETERR(mem_tobuffer(ctx->target, buf, n));
! 232: if (ctx->length >= 0) {
! 233: if (n > ctx->length)
! 234: return (ISC_R_BADBASE32);
! 235: else
! 236: ctx->length -= n;
! 237: }
! 238: ctx->digits = 0;
! 239: }
! 240: return (ISC_R_SUCCESS);
! 241: }
! 242:
! 243: static inline isc_result_t
! 244: base32_decode_finish(base32_decode_ctx_t *ctx) {
! 245: if (ctx->length > 0)
! 246: return (ISC_R_UNEXPECTEDEND);
! 247: if (ctx->digits != 0)
! 248: return (ISC_R_BADBASE32);
! 249: return (ISC_R_SUCCESS);
! 250: }
! 251:
! 252: static isc_result_t
! 253: base32_tobuffer(isc_lex_t *lexer, const char base[], isc_buffer_t *target,
! 254: int length)
! 255: {
! 256: base32_decode_ctx_t ctx;
! 257: isc_textregion_t *tr;
! 258: isc_token_t token;
! 259: isc_boolean_t eol;
! 260:
! 261: base32_decode_init(&ctx, length, base, target);
! 262:
! 263: while (!ctx.seen_end && (ctx.length != 0)) {
! 264: unsigned int i;
! 265:
! 266: if (length > 0)
! 267: eol = ISC_FALSE;
! 268: else
! 269: eol = ISC_TRUE;
! 270: RETERR(isc_lex_getmastertoken(lexer, &token,
! 271: isc_tokentype_string, eol));
! 272: if (token.type != isc_tokentype_string)
! 273: break;
! 274: tr = &token.value.as_textregion;
! 275: for (i = 0; i < tr->length; i++)
! 276: RETERR(base32_decode_char(&ctx, tr->base[i]));
! 277: }
! 278: if (ctx.length < 0 && !ctx.seen_end)
! 279: isc_lex_ungettoken(lexer, &token);
! 280: RETERR(base32_decode_finish(&ctx));
! 281: return (ISC_R_SUCCESS);
! 282: }
! 283:
! 284: isc_result_t
! 285: isc_base32_tobuffer(isc_lex_t *lexer, isc_buffer_t *target, int length) {
! 286: return (base32_tobuffer(lexer, base32, target, length));
! 287: }
! 288:
! 289: isc_result_t
! 290: isc_base32hex_tobuffer(isc_lex_t *lexer, isc_buffer_t *target, int length) {
! 291: return (base32_tobuffer(lexer, base32hex, target, length));
! 292: }
! 293:
! 294: static isc_result_t
! 295: base32_decodestring(const char *cstr, const char base[], isc_buffer_t *target) {
! 296: base32_decode_ctx_t ctx;
! 297:
! 298: base32_decode_init(&ctx, -1, base, target);
! 299: for (;;) {
! 300: int c = *cstr++;
! 301: if (c == '\0')
! 302: break;
! 303: if (c == ' ' || c == '\t' || c == '\n' || c== '\r')
! 304: continue;
! 305: RETERR(base32_decode_char(&ctx, c));
! 306: }
! 307: RETERR(base32_decode_finish(&ctx));
! 308: return (ISC_R_SUCCESS);
! 309: }
! 310:
! 311: isc_result_t
! 312: isc_base32_decodestring(const char *cstr, isc_buffer_t *target) {
! 313: return (base32_decodestring(cstr, base32, target));
! 314: }
! 315:
! 316: isc_result_t
! 317: isc_base32hex_decodestring(const char *cstr, isc_buffer_t *target) {
! 318: return (base32_decodestring(cstr, base32hex, target));
! 319: }
! 320:
! 321: static isc_result_t
! 322: base32_decoderegion(isc_region_t *source, const char base[], isc_buffer_t *target) {
! 323: base32_decode_ctx_t ctx;
! 324:
! 325: base32_decode_init(&ctx, -1, base, target);
! 326: while (source->length != 0) {
! 327: int c = *source->base;
! 328: RETERR(base32_decode_char(&ctx, c));
! 329: isc_region_consume(source, 1);
! 330: }
! 331: RETERR(base32_decode_finish(&ctx));
! 332: return (ISC_R_SUCCESS);
! 333: }
! 334:
! 335: isc_result_t
! 336: isc_base32_decoderegion(isc_region_t *source, isc_buffer_t *target) {
! 337: return (base32_decoderegion(source, base32, target));
! 338: }
! 339:
! 340: isc_result_t
! 341: isc_base32hex_decoderegion(isc_region_t *source, isc_buffer_t *target) {
! 342: return (base32_decoderegion(source, base32hex, target));
! 343: }
! 344:
! 345: static isc_result_t
! 346: str_totext(const char *source, isc_buffer_t *target) {
! 347: unsigned int l;
! 348: isc_region_t region;
! 349:
! 350: isc_buffer_availableregion(target, ®ion);
! 351: l = strlen(source);
! 352:
! 353: if (l > region.length)
! 354: return (ISC_R_NOSPACE);
! 355:
! 356: memcpy(region.base, source, l);
! 357: isc_buffer_add(target, l);
! 358: return (ISC_R_SUCCESS);
! 359: }
! 360:
! 361: static isc_result_t
! 362: mem_tobuffer(isc_buffer_t *target, void *base, unsigned int length) {
! 363: isc_region_t tr;
! 364:
! 365: isc_buffer_availableregion(target, &tr);
! 366: if (length > tr.length)
! 367: return (ISC_R_NOSPACE);
! 368: memcpy(tr.base, base, length);
! 369: isc_buffer_add(target, length);
! 370: return (ISC_R_SUCCESS);
! 371: }
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