diff options
Diffstat (limited to 'usr.sbin/bind/lib/dns/rdata/generic/nsec_47.c')
| -rw-r--r-- | usr.sbin/bind/lib/dns/rdata/generic/nsec_47.c | 366 |
1 files changed, 366 insertions, 0 deletions
diff --git a/usr.sbin/bind/lib/dns/rdata/generic/nsec_47.c b/usr.sbin/bind/lib/dns/rdata/generic/nsec_47.c new file mode 100644 index 00000000000..836e3a4d037 --- /dev/null +++ b/usr.sbin/bind/lib/dns/rdata/generic/nsec_47.c @@ -0,0 +1,366 @@ +/* + * Copyright (C) 2004 Internet Systems Consortium, Inc. ("ISC") + * Copyright (C) 2003 Internet Software Consortium. + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH + * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, + * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM + * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE + * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR + * PERFORMANCE OF THIS SOFTWARE. + */ + +/* $ISC: nsec_47.c,v 1.7.2.1 2004/03/08 02:08:03 marka Exp $ */ + +/* reviewed: Wed Mar 15 18:21:15 PST 2000 by brister */ + +/* draft-ietf-dnsext-nsec-rdata-01.txt */ + +#ifndef RDATA_GENERIC_NSEC_47_C +#define RDATA_GENERIC_NSEC_47_C + +/* + * The attributes do not include DNS_RDATATYPEATTR_SINGLETON + * because we must be able to handle a parent/child NSEC pair. + */ +#define RRTYPE_NSEC_ATTRIBUTES (DNS_RDATATYPEATTR_DNSSEC) + +static inline isc_result_t +fromtext_nsec(ARGS_FROMTEXT) { + isc_token_t token; + dns_name_t name; + isc_buffer_t buffer; + unsigned char bm[8*1024]; /* 64k bits */ + dns_rdatatype_t covered; + int octet; + int window; + + REQUIRE(type == 47); + + UNUSED(type); + UNUSED(rdclass); + UNUSED(callbacks); + + /* + * Next domain. + */ + RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string, + ISC_FALSE)); + dns_name_init(&name, NULL); + buffer_fromregion(&buffer, &token.value.as_region); + origin = (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, ISC_TRUE)); + if (token.type != isc_tokentype_string) + break; + RETTOK(dns_rdatatype_fromtext(&covered, + &token.value.as_textregion)); + bm[covered/8] |= (0x80>>(covered%8)); + } while (1); + isc_lex_ungettoken(lexer, &token); + for (window = 0; window < 256 ; window++) { + /* + * Find if we have a type in this window. + */ + for (octet = 31; octet >= 0; octet--) + if (bm[window * 32 + octet] != 0) + break; + if (octet < 0) + continue; + RETERR(uint8_tobuffer(window, target)); + RETERR(uint8_tobuffer(octet + 1, target)); + RETERR(mem_tobuffer(target, &bm[window * 32], octet + 1)); + } + return (ISC_R_SUCCESS); +} + +static inline isc_result_t +totext_nsec(ARGS_TOTEXT) { + isc_region_t sr; + unsigned int i, j, k; + dns_name_t name; + dns_name_t prefix; + isc_boolean_t sub; + unsigned int window, len; + + REQUIRE(rdata->type == 47); + 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 += len) { + INSIST(i + 2 <= sr.length); + window = sr.base[i]; + len = sr.base[i + 1]; + INSIST(len > 0 && len <= 32); + i += 2; + INSIST(i + len <= sr.length); + for (j = 0; j < len; j++) { + dns_rdatatype_t t; + if (sr.base[i + j] == 0) + continue; + for (k = 0; k < 8; k++) { + if ((sr.base[i + j] & (0x80 >> k)) == 0) + continue; + t = window * 256 + j * 8 + k; + RETERR(str_totext(" ", target)); + if (dns_rdatatype_isknown(t)) { + RETERR(dns_rdatatype_totext(t, target)); + } else { + char buf[sizeof("TYPE65535")]; + sprintf(buf, "TYPE%u", t); + RETERR(str_totext(buf, target)); + } + } + } + } + return (ISC_R_SUCCESS); +} + +static /* inline */ isc_result_t +fromwire_nsec(ARGS_FROMWIRE) { + isc_region_t sr; + dns_name_t name; + unsigned int window, lastwindow = 0; + unsigned int len; + isc_boolean_t first = ISC_TRUE; + unsigned int i; + + REQUIRE(type == 47); + + 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); + for (i = 0; i < sr.length; i += len) { + /* + * Check for overflow. + */ + if (i + 2 > sr.length) + RETERR(DNS_R_FORMERR); + window = sr.base[i]; + len = sr.base[i + 1]; + i += 2; + /* + * Check that bitmap windows are in the correct order. + */ + if (!first && window <= lastwindow) + RETERR(DNS_R_FORMERR); + /* + * Check for legal lengths. + */ + if (len < 1 || len > 32) + RETERR(DNS_R_FORMERR); + /* + * Check for overflow. + */ + if (i + len > sr.length) + RETERR(DNS_R_FORMERR); + /* + * The last octet of the bitmap must be non zero. + */ + if (sr.base[i + len - 1] == 0) + RETERR(DNS_R_FORMERR); + lastwindow = window; + first = ISC_FALSE; + } + if (i != sr.length) + return (DNS_R_EXTRADATA); + if (first) + RETERR(DNS_R_FORMERR); + RETERR(mem_tobuffer(target, sr.base, sr.length)); + isc_buffer_forward(source, sr.length); + return (ISC_R_SUCCESS); +} + +static inline isc_result_t +towire_nsec(ARGS_TOWIRE) { + isc_region_t sr; + dns_name_t name; + dns_offsets_t offsets; + + REQUIRE(rdata->type == 47); + 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 inline int +compare_nsec(ARGS_COMPARE) { + isc_region_t r1; + isc_region_t r2; + + REQUIRE(rdata1->type == rdata2->type); + REQUIRE(rdata1->rdclass == rdata2->rdclass); + REQUIRE(rdata1->type == 47); + 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 inline isc_result_t +fromstruct_nsec(ARGS_FROMSTRUCT) { + dns_rdata_nsec_t *nsec = source; + isc_region_t region; + unsigned int i, len, window, lastwindow = 0; + isc_boolean_t first = ISC_TRUE; + + REQUIRE(type == 47); + REQUIRE(source != NULL); + REQUIRE(nsec->common.rdtype == type); + REQUIRE(nsec->common.rdclass == rdclass); + REQUIRE(nsec->typebits != NULL || nsec->len == 0); + + UNUSED(type); + UNUSED(rdclass); + + dns_name_toregion(&nsec->next, ®ion); + RETERR(isc_buffer_copyregion(target, ®ion)); + /* + * Perform sanity check. + */ + for (i = 0; i < nsec->len ; i += len) { + INSIST(i + 2 <= nsec->len); + window = nsec->typebits[i]; + len = nsec->typebits[i+1]; + i += 2; + INSIST(first || window > lastwindow); + INSIST(len > 0 && len <= 32); + INSIST(i + len <= nsec->len); + INSIST(nsec->typebits[i + len - 1] != 0); + lastwindow = window; + first = ISC_FALSE; + } + INSIST(!first); + return (mem_tobuffer(target, nsec->typebits, nsec->len)); +} + +static inline isc_result_t +tostruct_nsec(ARGS_TOSTRUCT) { + isc_region_t region; + dns_rdata_nsec_t *nsec = target; + dns_name_t name; + + REQUIRE(rdata->type == 47); + REQUIRE(target != NULL); + REQUIRE(rdata->length != 0); + + nsec->common.rdclass = rdata->rdclass; + nsec->common.rdtype = rdata->type; + ISC_LINK_INIT(&nsec->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(&nsec->next, NULL); + RETERR(name_duporclone(&name, mctx, &nsec->next)); + + nsec->len = region.length; + nsec->typebits = mem_maybedup(mctx, region.base, region.length); + if (nsec->typebits == NULL) + goto cleanup; + + nsec->mctx = mctx; + return (ISC_R_SUCCESS); + + cleanup: + if (mctx != NULL) + dns_name_free(&nsec->next, mctx); + return (ISC_R_NOMEMORY); +} + +static inline void +freestruct_nsec(ARGS_FREESTRUCT) { + dns_rdata_nsec_t *nsec = source; + + REQUIRE(source != NULL); + REQUIRE(nsec->common.rdtype == 47); + + if (nsec->mctx == NULL) + return; + + dns_name_free(&nsec->next, nsec->mctx); + if (nsec->typebits != NULL) + isc_mem_free(nsec->mctx, nsec->typebits); + nsec->mctx = NULL; +} + +static inline isc_result_t +additionaldata_nsec(ARGS_ADDLDATA) { + REQUIRE(rdata->type == 47); + + UNUSED(rdata); + UNUSED(add); + UNUSED(arg); + + return (ISC_R_SUCCESS); +} + +static inline isc_result_t +digest_nsec(ARGS_DIGEST) { + isc_region_t r; + + REQUIRE(rdata->type == 47); + + dns_rdata_toregion(rdata, &r); + return ((digest)(arg, &r)); +} + +static inline isc_boolean_t +checkowner_nsec(ARGS_CHECKOWNER) { + + REQUIRE(type == 47); + + UNUSED(name); + UNUSED(type); + UNUSED(rdclass); + UNUSED(wildcard); + + return (ISC_TRUE); +} + +static inline isc_boolean_t +checknames_nsec(ARGS_CHECKNAMES) { + + REQUIRE(rdata->type == 47); + + UNUSED(rdata); + UNUSED(owner); + UNUSED(bad); + + return (ISC_TRUE); +} + +#endif /* RDATA_GENERIC_NSEC_47_C */ |