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8908da7dce
pointer deref in the client when built with LDNS and using DNSSEC with a CNAME. Patch from gregdlg+mr at hochet info.
286 lines
7.8 KiB
C
286 lines
7.8 KiB
C
/* $OpenBSD: getrrsetbyname.c,v 1.10 2005/03/30 02:58:28 tedu Exp $ */
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/*
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* Copyright (c) 2007 Simon Vallet / Genoscope <svallet@genoscope.cns.fr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Portions Copyright (c) 1999-2001 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
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* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
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* INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
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* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "includes.h"
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#if !defined (HAVE_GETRRSETBYNAME) && defined (HAVE_LDNS)
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#include <stdlib.h>
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#include <string.h>
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#include <ldns/ldns.h>
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#include "getrrsetbyname.h"
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#include "log.h"
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#include "xmalloc.h"
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#define malloc(x) (xmalloc(x))
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#define calloc(x, y) (xcalloc((x),(y)))
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#define free(x) (xfree(x))
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int
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getrrsetbyname(const char *hostname, unsigned int rdclass,
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unsigned int rdtype, unsigned int flags,
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struct rrsetinfo **res)
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{
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int result;
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unsigned int i, j, index_ans, index_sig;
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struct rrsetinfo *rrset = NULL;
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struct rdatainfo *rdata;
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size_t len;
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ldns_resolver *ldns_res;
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ldns_rdf *domain = NULL;
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ldns_pkt *pkt = NULL;
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ldns_rr_list *rrsigs = NULL, *rrdata = NULL;
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ldns_status err;
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ldns_rr *rr;
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/* check for invalid class and type */
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if (rdclass > 0xffff || rdtype > 0xffff) {
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result = ERRSET_INVAL;
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goto fail;
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}
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/* don't allow queries of class or type ANY */
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if (rdclass == 0xff || rdtype == 0xff) {
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result = ERRSET_INVAL;
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goto fail;
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}
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/* don't allow flags yet, unimplemented */
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if (flags) {
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result = ERRSET_INVAL;
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goto fail;
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}
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/* Initialize resolver from resolv.conf */
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domain = ldns_dname_new_frm_str(hostname);
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if ((err = ldns_resolver_new_frm_file(&ldns_res, NULL)) != \
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LDNS_STATUS_OK) {
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result = ERRSET_FAIL;
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goto fail;
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}
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#ifdef LDNS_DEBUG
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ldns_resolver_set_debug(ldns_res, true);
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#endif /* LDNS_DEBUG */
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ldns_resolver_set_dnssec(ldns_res, true); /* Use DNSSEC */
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/* make query */
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pkt = ldns_resolver_query(ldns_res, domain, rdtype, rdclass, LDNS_RD);
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/*** TODO: finer errcodes -- see original **/
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if (!pkt || ldns_pkt_ancount(pkt) < 1) {
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result = ERRSET_FAIL;
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goto fail;
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}
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/* initialize rrset */
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rrset = calloc(1, sizeof(struct rrsetinfo));
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if (rrset == NULL) {
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result = ERRSET_NOMEMORY;
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goto fail;
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}
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rrdata = ldns_pkt_rr_list_by_type(pkt, rdtype, LDNS_SECTION_ANSWER);
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rrset->rri_nrdatas = ldns_rr_list_rr_count(rrdata);
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if (!rrset->rri_nrdatas) {
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result = ERRSET_NODATA;
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goto fail;
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}
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/* copy name from answer section */
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len = ldns_rdf_size(ldns_rr_owner(ldns_rr_list_rr(rrdata, 0)));
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if ((rrset->rri_name = malloc(len)) == NULL) {
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result = ERRSET_NOMEMORY;
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goto fail;
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}
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memcpy(rrset->rri_name,
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ldns_rdf_data(ldns_rr_owner(ldns_rr_list_rr(rrdata, 0))), len);
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rrset->rri_rdclass = ldns_rr_get_class(ldns_rr_list_rr(rrdata, 0));
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rrset->rri_rdtype = ldns_rr_get_type(ldns_rr_list_rr(rrdata, 0));
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rrset->rri_ttl = ldns_rr_ttl(ldns_rr_list_rr(rrdata, 0));
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debug2("ldns: got %u answers from DNS", rrset->rri_nrdatas);
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/* Check for authenticated data */
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if (ldns_pkt_ad(pkt)) {
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rrset->rri_flags |= RRSET_VALIDATED;
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} else { /* AD is not set, try autonomous validation */
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ldns_rr_list * trusted_keys = ldns_rr_list_new();
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debug2("ldns: trying to validate RRset");
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/* Get eventual sigs */
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rrsigs = ldns_pkt_rr_list_by_type(pkt, LDNS_RR_TYPE_RRSIG,
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LDNS_SECTION_ANSWER);
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rrset->rri_nsigs = ldns_rr_list_rr_count(rrsigs);
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debug2("ldns: got %u signature(s) (RRTYPE %u) from DNS",
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rrset->rri_nsigs, LDNS_RR_TYPE_RRSIG);
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if ((err = ldns_verify_trusted(ldns_res, rrdata, rrsigs,
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trusted_keys)) == LDNS_STATUS_OK) {
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rrset->rri_flags |= RRSET_VALIDATED;
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debug2("ldns: RRset is signed with a valid key");
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} else {
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debug2("ldns: RRset validation failed: %s",
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ldns_get_errorstr_by_id(err));
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}
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ldns_rr_list_deep_free(trusted_keys);
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}
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/* allocate memory for answers */
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rrset->rri_rdatas = calloc(rrset->rri_nrdatas,
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sizeof(struct rdatainfo));
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if (rrset->rri_rdatas == NULL) {
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result = ERRSET_NOMEMORY;
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goto fail;
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}
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/* allocate memory for signatures */
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if (rrset->rri_nsigs > 0) {
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rrset->rri_sigs = calloc(rrset->rri_nsigs,
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sizeof(struct rdatainfo));
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if (rrset->rri_sigs == NULL) {
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result = ERRSET_NOMEMORY;
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goto fail;
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}
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}
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/* copy answers & signatures */
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for (i=0, index_ans=0, index_sig=0; i< pkt->_header->_ancount; i++) {
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rdata = NULL;
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rr = ldns_rr_list_rr(ldns_pkt_answer(pkt), i);
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if (ldns_rr_get_class(rr) == rrset->rri_rdclass &&
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ldns_rr_get_type(rr) == rrset->rri_rdtype) {
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rdata = &rrset->rri_rdatas[index_ans++];
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}
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if (rr->_rr_class == rrset->rri_rdclass &&
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rr->_rr_type == LDNS_RR_TYPE_RRSIG &&
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rrset->rri_sigs) {
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rdata = &rrset->rri_sigs[index_sig++];
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}
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if (rdata) {
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size_t rdata_offset = 0;
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rdata->rdi_length = 0;
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for (j=0; j< rr->_rd_count; j++) {
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rdata->rdi_length +=
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ldns_rdf_size(ldns_rr_rdf(rr, j));
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}
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rdata->rdi_data = malloc(rdata->rdi_length);
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if (rdata->rdi_data == NULL) {
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result = ERRSET_NOMEMORY;
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goto fail;
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}
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/* Re-create the raw DNS RDATA */
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for (j=0; j< rr->_rd_count; j++) {
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len = ldns_rdf_size(ldns_rr_rdf(rr, j));
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memcpy(rdata->rdi_data + rdata_offset,
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ldns_rdf_data(ldns_rr_rdf(rr, j)), len);
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rdata_offset += len;
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}
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}
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}
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*res = rrset;
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result = ERRSET_SUCCESS;
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fail:
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/* freerrset(rrset); */
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ldns_rdf_deep_free(domain);
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ldns_pkt_free(pkt);
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ldns_rr_list_deep_free(rrsigs);
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ldns_rr_list_deep_free(rrdata);
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ldns_resolver_deep_free(ldns_res);
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return result;
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}
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void
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freerrset(struct rrsetinfo *rrset)
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{
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u_int16_t i;
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if (rrset == NULL)
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return;
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if (rrset->rri_rdatas) {
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for (i = 0; i < rrset->rri_nrdatas; i++) {
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if (rrset->rri_rdatas[i].rdi_data == NULL)
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break;
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free(rrset->rri_rdatas[i].rdi_data);
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}
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free(rrset->rri_rdatas);
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}
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if (rrset->rri_sigs) {
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for (i = 0; i < rrset->rri_nsigs; i++) {
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if (rrset->rri_sigs[i].rdi_data == NULL)
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break;
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free(rrset->rri_sigs[i].rdi_data);
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}
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free(rrset->rri_sigs);
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}
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if (rrset->rri_name)
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free(rrset->rri_name);
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free(rrset);
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}
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#endif /* !defined (HAVE_GETRRSETBYNAME) && defined (HAVE_LDNS) */
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