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