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These files were pulled from the 1.6.3 release tarball. This new version builds against OpenSSL version 1.1 which will be the default in the new Debian Stable which is due to be released RealSoonNow (tm).
194 lines
6.6 KiB
C
194 lines
6.6 KiB
C
/*
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* pythonmod_utils.c: utilities used by wrapper
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*
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* Copyright (c) 2009, Zdenek Vasicek (vasicek AT fit.vutbr.cz)
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* Marek Vavrusa (xvavru00 AT stud.fit.vutbr.cz)
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*
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* This software is open source.
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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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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* * Neither the name of the organization nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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* Utility functions for the python module that perform stores and loads and
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* conversions.
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*/
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#include "config.h"
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#include "util/module.h"
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#include "util/netevent.h"
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#include "util/net_help.h"
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#include "services/cache/dns.h"
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#include "services/cache/rrset.h"
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#include "util/data/msgparse.h"
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#include "util/data/msgreply.h"
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#include "util/storage/slabhash.h"
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#include "util/regional.h"
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#include "iterator/iter_delegpt.h"
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#include "sldns/sbuffer.h"
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#undef _POSIX_C_SOURCE
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#undef _XOPEN_SOURCE
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#include <Python.h>
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/* Store the reply_info and query_info pair in message cache (qstate->msg_cache) */
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int storeQueryInCache(struct module_qstate* qstate, struct query_info* qinfo, struct reply_info* msgrep, int is_referral)
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{
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if (!msgrep)
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return 0;
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if (msgrep->authoritative) /*authoritative answer can't be stored in cache*/
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{
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PyErr_SetString(PyExc_ValueError, "Authoritative answer can't be stored");
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return 0;
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}
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return dns_cache_store(qstate->env, qinfo, msgrep, is_referral,
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qstate->prefetch_leeway, 0, NULL, qstate->query_flags);
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}
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/* Invalidate the message associated with query_info stored in message cache */
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void invalidateQueryInCache(struct module_qstate* qstate, struct query_info* qinfo)
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{
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hashvalue_type h;
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struct lruhash_entry* e;
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struct reply_info *r;
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size_t i, j;
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h = query_info_hash(qinfo, qstate->query_flags);
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if ((e=slabhash_lookup(qstate->env->msg_cache, h, qinfo, 0)))
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{
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r = (struct reply_info*)(e->data);
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if (r)
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{
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r->ttl = 0;
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if(rrset_array_lock(r->ref, r->rrset_count, *qstate->env->now)) {
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for(i=0; i< r->rrset_count; i++)
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{
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struct packed_rrset_data* data =
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(struct packed_rrset_data*) r->ref[i].key->entry.data;
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if(i>0 && r->ref[i].key == r->ref[i-1].key)
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continue;
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data->ttl = r->ttl;
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for(j=0; j<data->count + data->rrsig_count; j++)
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data->rr_ttl[j] = r->ttl;
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}
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rrset_array_unlock(r->ref, r->rrset_count);
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}
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}
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lock_rw_unlock(&e->lock);
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} else {
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log_info("invalidateQueryInCache: qinfo is not in cache");
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}
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}
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/* Create response according to the ldns packet content */
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int createResponse(struct module_qstate* qstate, sldns_buffer* pkt)
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{
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struct msg_parse* prs;
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struct edns_data edns;
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/* parse message */
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prs = (struct msg_parse*) regional_alloc(qstate->env->scratch, sizeof(struct msg_parse));
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if (!prs) {
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log_err("storeResponse: out of memory on incoming message");
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return 0;
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}
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memset(prs, 0, sizeof(*prs));
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memset(&edns, 0, sizeof(edns));
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sldns_buffer_set_position(pkt, 0);
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if (parse_packet(pkt, prs, qstate->env->scratch) != LDNS_RCODE_NOERROR) {
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verbose(VERB_ALGO, "storeResponse: parse error on reply packet");
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return 0;
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}
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/* edns is not examined, but removed from message to help cache */
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if(parse_extract_edns(prs, &edns, qstate->env->scratch) !=
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LDNS_RCODE_NOERROR)
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return 0;
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/* remove CD-bit, we asked for in case we handle validation ourself */
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prs->flags &= ~BIT_CD;
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/* allocate response dns_msg in region */
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qstate->return_msg = (struct dns_msg*)regional_alloc(qstate->region, sizeof(struct dns_msg));
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if (!qstate->return_msg)
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return 0;
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memset(qstate->return_msg, 0, sizeof(*qstate->return_msg));
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if(!parse_create_msg(pkt, prs, NULL, &(qstate->return_msg)->qinfo, &(qstate->return_msg)->rep, qstate->region)) {
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log_err("storeResponse: malloc failure: allocating incoming dns_msg");
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return 0;
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}
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/* Make sure that the RA flag is set (since the presence of
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* this module means that recursion is available) */
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/* qstate->return_msg->rep->flags |= BIT_RA; */
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/* Clear the AA flag */
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/* FIXME: does this action go here or in some other module? */
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/*qstate->return_msg->rep->flags &= ~BIT_AA; */
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/* make sure QR flag is on */
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/*qstate->return_msg->rep->flags |= BIT_QR; */
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if(verbosity >= VERB_ALGO)
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log_dns_msg("storeResponse: packet:", &qstate->return_msg->qinfo, qstate->return_msg->rep);
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return 1;
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}
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/* Convert reply->addr to string */
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void reply_addr2str(struct comm_reply* reply, char* dest, int maxlen)
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{
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int af = (int)((struct sockaddr_in*) &(reply->addr))->sin_family;
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void* sinaddr = &((struct sockaddr_in*) &(reply->addr))->sin_addr;
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if(af == AF_INET6)
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sinaddr = &((struct sockaddr_in6*)&(reply->addr))->sin6_addr;
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dest[0] = 0;
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if (inet_ntop(af, sinaddr, dest, (socklen_t)maxlen) == 0)
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return;
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dest[maxlen-1] = 0;
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}
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/* Convert target->addr to string */
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void delegpt_addr_addr2str(struct delegpt_addr* target, char *dest, int maxlen)
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{
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int af = (int)((struct sockaddr_in*) &(target->addr))->sin_family;
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void* sinaddr = &((struct sockaddr_in*) &(target->addr))->sin_addr;
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if(af == AF_INET6)
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sinaddr = &((struct sockaddr_in6*)&(target->addr))->sin6_addr;
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dest[0] = 0;
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if (inet_ntop(af, sinaddr, dest, (socklen_t)maxlen) == 0)
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return;
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dest[maxlen-1] = 0;
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}
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