/* $NetBSD: sshfp_44.c,v 1.4.4.2 2024/02/29 12:34:46 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. */ /* RFC 4255 */ #ifndef RDATA_GENERIC_SSHFP_44_C #define RDATA_GENERIC_SSHFP_44_C #define RRTYPE_SSHFP_ATTRIBUTES (0) static isc_result_t fromtext_sshfp(ARGS_FROMTEXT) { isc_token_t token; int len = -1; REQUIRE(type == dns_rdatatype_sshfp); UNUSED(type); UNUSED(rdclass); UNUSED(origin); UNUSED(options); UNUSED(callbacks); /* * Algorithm. */ RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number, false)); if (token.value.as_ulong > 0xffU) { RETTOK(ISC_R_RANGE); } RETERR(uint8_tobuffer(token.value.as_ulong, target)); /* * Digest type. */ RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number, false)); if (token.value.as_ulong > 0xffU) { RETTOK(ISC_R_RANGE); } RETERR(uint8_tobuffer(token.value.as_ulong, target)); /* * Enforce known digest lengths. */ switch (token.value.as_ulong) { case 1: len = ISC_SHA1_DIGESTLENGTH; break; case 2: len = ISC_SHA256_DIGESTLENGTH; break; default: break; } /* * Digest. */ return (isc_hex_tobuffer(lexer, target, len)); } static isc_result_t totext_sshfp(ARGS_TOTEXT) { isc_region_t sr; char buf[sizeof("64000 ")]; unsigned int n; REQUIRE(rdata->type == dns_rdatatype_sshfp); REQUIRE(rdata->length != 0); UNUSED(tctx); dns_rdata_toregion(rdata, &sr); /* * Algorithm. */ n = uint8_fromregion(&sr); isc_region_consume(&sr, 1); snprintf(buf, sizeof(buf), "%u ", n); RETERR(str_totext(buf, target)); /* * Digest type. */ n = uint8_fromregion(&sr); isc_region_consume(&sr, 1); snprintf(buf, sizeof(buf), "%u", n); RETERR(str_totext(buf, target)); if (sr.length == 0U) { return (ISC_R_SUCCESS); } /* * Digest. */ if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0) { RETERR(str_totext(" (", target)); } RETERR(str_totext(tctx->linebreak, target)); if (tctx->width == 0) { /* No splitting */ RETERR(isc_hex_totext(&sr, 0, "", target)); } else { RETERR(isc_hex_totext(&sr, tctx->width - 2, tctx->linebreak, target)); } if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0) { RETERR(str_totext(" )", target)); } return (ISC_R_SUCCESS); } static isc_result_t fromwire_sshfp(ARGS_FROMWIRE) { isc_region_t sr; REQUIRE(type == dns_rdatatype_sshfp); UNUSED(type); UNUSED(rdclass); UNUSED(dctx); UNUSED(options); isc_buffer_activeregion(source, &sr); if (sr.length < 2) { return (ISC_R_UNEXPECTEDEND); } if ((sr.base[1] == 1 && sr.length != ISC_SHA1_DIGESTLENGTH + 2) || (sr.base[1] == 2 && sr.length != ISC_SHA256_DIGESTLENGTH + 2)) { return (DNS_R_FORMERR); } isc_buffer_forward(source, sr.length); return (mem_tobuffer(target, sr.base, sr.length)); } static isc_result_t towire_sshfp(ARGS_TOWIRE) { isc_region_t sr; REQUIRE(rdata->type == dns_rdatatype_sshfp); REQUIRE(rdata->length != 0); UNUSED(cctx); dns_rdata_toregion(rdata, &sr); return (mem_tobuffer(target, sr.base, sr.length)); } static int compare_sshfp(ARGS_COMPARE) { isc_region_t r1; isc_region_t r2; REQUIRE(rdata1->type == rdata2->type); REQUIRE(rdata1->rdclass == rdata2->rdclass); REQUIRE(rdata1->type == dns_rdatatype_sshfp); REQUIRE(rdata1->length != 0); REQUIRE(rdata2->length != 0); dns_rdata_toregion(rdata1, &r1); dns_rdata_toregion(rdata2, &r2); return (isc_region_compare(&r1, &r2)); } static isc_result_t fromstruct_sshfp(ARGS_FROMSTRUCT) { dns_rdata_sshfp_t *sshfp = source; REQUIRE(type == dns_rdatatype_sshfp); REQUIRE(sshfp != NULL); REQUIRE(sshfp->common.rdtype == type); REQUIRE(sshfp->common.rdclass == rdclass); UNUSED(type); UNUSED(rdclass); RETERR(uint8_tobuffer(sshfp->algorithm, target)); RETERR(uint8_tobuffer(sshfp->digest_type, target)); return (mem_tobuffer(target, sshfp->digest, sshfp->length)); } static isc_result_t tostruct_sshfp(ARGS_TOSTRUCT) { dns_rdata_sshfp_t *sshfp = target; isc_region_t region; REQUIRE(rdata->type == dns_rdatatype_sshfp); REQUIRE(sshfp != NULL); REQUIRE(rdata->length != 0); sshfp->common.rdclass = rdata->rdclass; sshfp->common.rdtype = rdata->type; ISC_LINK_INIT(&sshfp->common, link); dns_rdata_toregion(rdata, ®ion); sshfp->algorithm = uint8_fromregion(®ion); isc_region_consume(®ion, 1); sshfp->digest_type = uint8_fromregion(®ion); isc_region_consume(®ion, 1); sshfp->length = region.length; sshfp->digest = mem_maybedup(mctx, region.base, region.length); if (sshfp->digest == NULL) { return (ISC_R_NOMEMORY); } sshfp->mctx = mctx; return (ISC_R_SUCCESS); } static void freestruct_sshfp(ARGS_FREESTRUCT) { dns_rdata_sshfp_t *sshfp = source; REQUIRE(sshfp != NULL); REQUIRE(sshfp->common.rdtype == dns_rdatatype_sshfp); if (sshfp->mctx == NULL) { return; } if (sshfp->digest != NULL) { isc_mem_free(sshfp->mctx, sshfp->digest); } sshfp->mctx = NULL; } static isc_result_t additionaldata_sshfp(ARGS_ADDLDATA) { REQUIRE(rdata->type == dns_rdatatype_sshfp); UNUSED(rdata); UNUSED(owner); UNUSED(add); UNUSED(arg); return (ISC_R_SUCCESS); } static isc_result_t digest_sshfp(ARGS_DIGEST) { isc_region_t r; REQUIRE(rdata->type == dns_rdatatype_sshfp); dns_rdata_toregion(rdata, &r); return ((digest)(arg, &r)); } static bool checkowner_sshfp(ARGS_CHECKOWNER) { REQUIRE(type == dns_rdatatype_sshfp); UNUSED(name); UNUSED(type); UNUSED(rdclass); UNUSED(wildcard); return (true); } static bool checknames_sshfp(ARGS_CHECKNAMES) { REQUIRE(rdata->type == dns_rdatatype_sshfp); UNUSED(rdata); UNUSED(owner); UNUSED(bad); return (true); } static int casecompare_sshfp(ARGS_COMPARE) { return (compare_sshfp(rdata1, rdata2)); } #endif /* RDATA_GENERIC_SSHFP_44_C */