/* $NetBSD: nxt_30.c,v 1.7.2.1 2024/02/25 15:47:04 martin Exp $ */ /* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * SPDX-License-Identifier: MPL-2.0 * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ /* RFC2535 */ #ifndef RDATA_GENERIC_NXT_30_C #define RDATA_GENERIC_NXT_30_C /* * The attributes do not include DNS_RDATATYPEATTR_SINGLETON * because we must be able to handle a parent/child NXT pair. */ #define RRTYPE_NXT_ATTRIBUTES (0) static isc_result_t fromtext_nxt(ARGS_FROMTEXT) { isc_token_t token; dns_name_t name; isc_buffer_t buffer; char *e; unsigned char bm[8 * 1024]; /* 64k bits */ dns_rdatatype_t covered; dns_rdatatype_t maxcovered = 0; bool first = true; long n; REQUIRE(type == dns_rdatatype_nxt); UNUSED(type); UNUSED(rdclass); UNUSED(callbacks); /* * Next domain. */ RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string, false)); dns_name_init(&name, NULL); buffer_fromregion(&buffer, &token.value.as_region); if (origin == NULL) { origin = dns_rootname; } RETTOK(dns_name_fromtext(&name, &buffer, origin, options, target)); memset(bm, 0, sizeof(bm)); do { RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string, true)); if (token.type != isc_tokentype_string) { break; } n = strtol(DNS_AS_STR(token), &e, 10); if (e != DNS_AS_STR(token) && *e == '\0') { covered = (dns_rdatatype_t)n; } else if (dns_rdatatype_fromtext(&covered, &token.value.as_textregion) == DNS_R_UNKNOWN) { RETTOK(DNS_R_UNKNOWN); } /* * NXT is only specified for types 1..127. */ if (covered < 1 || covered > 127) { return (ISC_R_RANGE); } if (first || covered > maxcovered) { maxcovered = covered; } first = false; bm[covered / 8] |= (0x80 >> (covered % 8)); } while (1); isc_lex_ungettoken(lexer, &token); if (first) { return (ISC_R_SUCCESS); } n = (maxcovered + 8) / 8; return (mem_tobuffer(target, bm, n)); } static isc_result_t totext_nxt(ARGS_TOTEXT) { isc_region_t sr; unsigned int i, j; dns_name_t name; dns_name_t prefix; bool sub; REQUIRE(rdata->type == dns_rdatatype_nxt); REQUIRE(rdata->length != 0); dns_name_init(&name, NULL); dns_name_init(&prefix, NULL); dns_rdata_toregion(rdata, &sr); dns_name_fromregion(&name, &sr); isc_region_consume(&sr, name_length(&name)); sub = name_prefix(&name, tctx->origin, &prefix); RETERR(dns_name_totext(&prefix, sub, target)); for (i = 0; i < sr.length; i++) { if (sr.base[i] != 0) { for (j = 0; j < 8; j++) { if ((sr.base[i] & (0x80 >> j)) != 0) { { dns_rdatatype_t t = i * 8 + j; RETERR(str_totext(" ", target)); if (dns_rdatatype_isknown(t)) { RETERR(dns_rdatatype_totext( t, target)); } else { char buf[sizeof("6553" "5")]; snprintf(buf, sizeof(buf), "%u", t); RETERR(str_totext( buf, target)); } } } } } } return (ISC_R_SUCCESS); } static isc_result_t fromwire_nxt(ARGS_FROMWIRE) { isc_region_t sr; dns_name_t name; REQUIRE(type == dns_rdatatype_nxt); UNUSED(type); UNUSED(rdclass); dns_decompress_setmethods(dctx, DNS_COMPRESS_NONE); dns_name_init(&name, NULL); RETERR(dns_name_fromwire(&name, source, dctx, options, target)); isc_buffer_activeregion(source, &sr); if (sr.length > 0 && ((sr.base[0] & 0x80) != 0 || sr.length > 16 || sr.base[sr.length - 1] == 0)) { return (DNS_R_BADBITMAP); } RETERR(mem_tobuffer(target, sr.base, sr.length)); isc_buffer_forward(source, sr.length); return (ISC_R_SUCCESS); } static isc_result_t towire_nxt(ARGS_TOWIRE) { isc_region_t sr; dns_name_t name; dns_offsets_t offsets; REQUIRE(rdata->type == dns_rdatatype_nxt); REQUIRE(rdata->length != 0); dns_compress_setmethods(cctx, DNS_COMPRESS_NONE); dns_name_init(&name, offsets); dns_rdata_toregion(rdata, &sr); dns_name_fromregion(&name, &sr); isc_region_consume(&sr, name_length(&name)); RETERR(dns_name_towire(&name, cctx, target)); return (mem_tobuffer(target, sr.base, sr.length)); } static int compare_nxt(ARGS_COMPARE) { isc_region_t r1; isc_region_t r2; dns_name_t name1; dns_name_t name2; int order; REQUIRE(rdata1->type == rdata2->type); REQUIRE(rdata1->rdclass == rdata2->rdclass); REQUIRE(rdata1->type == dns_rdatatype_nxt); REQUIRE(rdata1->length != 0); REQUIRE(rdata2->length != 0); dns_name_init(&name1, NULL); dns_name_init(&name2, NULL); dns_rdata_toregion(rdata1, &r1); dns_rdata_toregion(rdata2, &r2); dns_name_fromregion(&name1, &r1); dns_name_fromregion(&name2, &r2); order = dns_name_rdatacompare(&name1, &name2); if (order != 0) { return (order); } isc_region_consume(&r1, name_length(&name1)); isc_region_consume(&r2, name_length(&name2)); return (isc_region_compare(&r1, &r2)); } static isc_result_t fromstruct_nxt(ARGS_FROMSTRUCT) { dns_rdata_nxt_t *nxt = source; isc_region_t region; REQUIRE(type == dns_rdatatype_nxt); REQUIRE(nxt != NULL); REQUIRE(nxt->common.rdtype == type); REQUIRE(nxt->common.rdclass == rdclass); REQUIRE(nxt->typebits != NULL || nxt->len == 0); if (nxt->typebits != NULL && (nxt->typebits[0] & 0x80) == 0) { REQUIRE(nxt->len <= 16); REQUIRE(nxt->typebits[nxt->len - 1] != 0); } UNUSED(type); UNUSED(rdclass); dns_name_toregion(&nxt->next, ®ion); RETERR(isc_buffer_copyregion(target, ®ion)); return (mem_tobuffer(target, nxt->typebits, nxt->len)); } static isc_result_t tostruct_nxt(ARGS_TOSTRUCT) { isc_region_t region; dns_rdata_nxt_t *nxt = target; dns_name_t name; REQUIRE(rdata->type == dns_rdatatype_nxt); REQUIRE(nxt != NULL); REQUIRE(rdata->length != 0); nxt->common.rdclass = rdata->rdclass; nxt->common.rdtype = rdata->type; ISC_LINK_INIT(&nxt->common, link); dns_name_init(&name, NULL); dns_rdata_toregion(rdata, ®ion); dns_name_fromregion(&name, ®ion); isc_region_consume(®ion, name_length(&name)); dns_name_init(&nxt->next, NULL); name_duporclone(&name, mctx, &nxt->next); nxt->len = region.length; nxt->typebits = mem_maybedup(mctx, region.base, region.length); if (nxt->typebits == NULL) { goto cleanup; } nxt->mctx = mctx; return (ISC_R_SUCCESS); cleanup: if (mctx != NULL) { dns_name_free(&nxt->next, mctx); } return (ISC_R_NOMEMORY); } static void freestruct_nxt(ARGS_FREESTRUCT) { dns_rdata_nxt_t *nxt = source; REQUIRE(nxt != NULL); REQUIRE(nxt->common.rdtype == dns_rdatatype_nxt); if (nxt->mctx == NULL) { return; } dns_name_free(&nxt->next, nxt->mctx); if (nxt->typebits != NULL) { isc_mem_free(nxt->mctx, nxt->typebits); } nxt->mctx = NULL; } static isc_result_t additionaldata_nxt(ARGS_ADDLDATA) { REQUIRE(rdata->type == dns_rdatatype_nxt); UNUSED(rdata); UNUSED(owner); UNUSED(add); UNUSED(arg); return (ISC_R_SUCCESS); } static isc_result_t digest_nxt(ARGS_DIGEST) { isc_region_t r; dns_name_t name; isc_result_t result; REQUIRE(rdata->type == dns_rdatatype_nxt); dns_rdata_toregion(rdata, &r); dns_name_init(&name, NULL); dns_name_fromregion(&name, &r); result = dns_name_digest(&name, digest, arg); if (result != ISC_R_SUCCESS) { return (result); } isc_region_consume(&r, name_length(&name)); return ((digest)(arg, &r)); } static bool checkowner_nxt(ARGS_CHECKOWNER) { REQUIRE(type == dns_rdatatype_nxt); UNUSED(name); UNUSED(type); UNUSED(rdclass); UNUSED(wildcard); return (true); } static bool checknames_nxt(ARGS_CHECKNAMES) { REQUIRE(rdata->type == dns_rdatatype_nxt); UNUSED(rdata); UNUSED(owner); UNUSED(bad); return (true); } static int casecompare_nxt(ARGS_COMPARE) { return (compare_nxt(rdata1, rdata2)); } #endif /* RDATA_GENERIC_NXT_30_C */