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Diffstat (limited to '')
| -rw-r--r-- | lib/dns/rdata/generic/sshfp_44.c | 296 |
1 files changed, 296 insertions, 0 deletions
diff --git a/lib/dns/rdata/generic/sshfp_44.c b/lib/dns/rdata/generic/sshfp_44.c new file mode 100644 index 0000000..9ca97b4 --- /dev/null +++ b/lib/dns/rdata/generic/sshfp_44.c @@ -0,0 +1,296 @@ +/* + * 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(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 */ |