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/*
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* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* See the COPYRIGHT file distributed with this work for additional
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* information regarding copyright ownership.
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*/
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/*! \file */
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#include <config.h>
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#include <ctype.h>
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#include <stdbool.h>
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#include <isc/buffer.h>
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#include <isc/hex.h>
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#include <isc/lex.h>
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#include <isc/string.h>
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#include <isc/util.h>
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#define RETERR(x) do { \
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isc_result_t _r = (x); \
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if (_r != ISC_R_SUCCESS) \
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return (_r); \
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} while (0)
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/*
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* BEW: These static functions are copied from lib/dns/rdata.c.
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*/
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static isc_result_t
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str_totext(const char *source, isc_buffer_t *target);
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static isc_result_t
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mem_tobuffer(isc_buffer_t *target, void *base, unsigned int length);
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static const char hex[] = "0123456789ABCDEF";
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isc_result_t
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isc_hex_totext(isc_region_t *source, int wordlength,
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const char *wordbreak, isc_buffer_t *target)
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{
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char buf[3];
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unsigned int loops = 0;
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if (wordlength < 2)
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wordlength = 2;
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memset(buf, 0, sizeof(buf));
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while (source->length > 0) {
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buf[0] = hex[(source->base[0] >> 4) & 0xf];
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buf[1] = hex[(source->base[0]) & 0xf];
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RETERR(str_totext(buf, target));
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isc_region_consume(source, 1);
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loops++;
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if (source->length != 0 &&
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(int)((loops + 1) * 2) >= wordlength)
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{
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loops = 0;
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RETERR(str_totext(wordbreak, target));
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}
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}
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return (ISC_R_SUCCESS);
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}
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/*%
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* State of a hex decoding process in progress.
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*/
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typedef struct {
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int length; /*%< Desired length of binary data or -1 */
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isc_buffer_t *target; /*%< Buffer for resulting binary data */
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int digits; /*%< Number of buffered hex digits */
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int val[2];
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} hex_decode_ctx_t;
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static inline void
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hex_decode_init(hex_decode_ctx_t *ctx, int length, isc_buffer_t *target)
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{
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ctx->digits = 0;
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ctx->length = length;
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ctx->target = target;
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}
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static inline isc_result_t
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hex_decode_char(hex_decode_ctx_t *ctx, int c) {
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const char *s;
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if ((s = strchr(hex, toupper(c))) == NULL)
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return (ISC_R_BADHEX);
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ctx->val[ctx->digits++] = (int)(s - hex);
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if (ctx->digits == 2) {
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unsigned char num;
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num = (ctx->val[0] << 4) + (ctx->val[1]);
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RETERR(mem_tobuffer(ctx->target, &num, 1));
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if (ctx->length >= 0) {
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if (ctx->length == 0)
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return (ISC_R_BADHEX);
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else
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ctx->length -= 1;
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}
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ctx->digits = 0;
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}
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return (ISC_R_SUCCESS);
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}
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static inline isc_result_t
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hex_decode_finish(hex_decode_ctx_t *ctx) {
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if (ctx->length > 0)
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return (ISC_R_UNEXPECTEDEND);
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if (ctx->digits != 0)
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return (ISC_R_BADHEX);
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return (ISC_R_SUCCESS);
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}
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isc_result_t
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isc_hex_tobuffer(isc_lex_t *lexer, isc_buffer_t *target, int length) {
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unsigned int before, after;
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hex_decode_ctx_t ctx;
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isc_textregion_t *tr;
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isc_token_t token;
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bool eol;
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REQUIRE(length >= -2);
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hex_decode_init(&ctx, length, target);
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before = isc_buffer_usedlength(target);
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while (ctx.length != 0) {
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unsigned int i;
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if (length > 0) {
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eol = false;
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} else {
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eol = true;
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}
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RETERR(isc_lex_getmastertoken(lexer, &token,
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isc_tokentype_string, eol));
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if (token.type != isc_tokentype_string) {
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break;
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}
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tr = &token.value.as_textregion;
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for (i = 0; i < tr->length; i++) {
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RETERR(hex_decode_char(&ctx, tr->base[i]));
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}
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}
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after = isc_buffer_usedlength(target);
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if (ctx.length < 0) {
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isc_lex_ungettoken(lexer, &token);
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}
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RETERR(hex_decode_finish(&ctx));
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if (length == -2 && before == after) {
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return (ISC_R_UNEXPECTEDEND);
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}
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return (ISC_R_SUCCESS);
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}
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isc_result_t
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isc_hex_decodestring(const char *cstr, isc_buffer_t *target) {
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hex_decode_ctx_t ctx;
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hex_decode_init(&ctx, -1, target);
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for (;;) {
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int c = *cstr++;
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if (c == '\0')
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break;
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if (c == ' ' || c == '\t' || c == '\n' || c== '\r')
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continue;
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RETERR(hex_decode_char(&ctx, c));
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}
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RETERR(hex_decode_finish(&ctx));
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return (ISC_R_SUCCESS);
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}
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static isc_result_t
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str_totext(const char *source, isc_buffer_t *target) {
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unsigned int l;
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isc_region_t region;
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isc_buffer_availableregion(target, ®ion);
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l = strlen(source);
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if (l > region.length)
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return (ISC_R_NOSPACE);
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memmove(region.base, source, l);
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isc_buffer_add(target, l);
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return (ISC_R_SUCCESS);
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}
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static isc_result_t
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mem_tobuffer(isc_buffer_t *target, void *base, unsigned int length) {
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isc_region_t tr;
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isc_buffer_availableregion(target, &tr);
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if (length > tr.length)
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return (ISC_R_NOSPACE);
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memmove(tr.base, base, length);
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isc_buffer_add(target, length);
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return (ISC_R_SUCCESS);
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}
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