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_t 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) != 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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