hermes/src/Spf.cpp

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2008-12-14 20:12:48 +01:00
/**
* hermes antispam proxy
* Copyright (C) 2006, 2007 Juan José Gutiérrez de Quevedo <juanjo@gutierrezdequevedo.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* @author Juan José Gutiérrez de Quevedo <juanjo@gutierrezdequevedo.com>
*/
#include "Spf.h"
SPF_server_t *Spf::spfserver=NULL;
/**
* constructor
*
* it will create a spfserver if this is the first created object of the class.
* if it isn't, then we just create an spfrequest
*/
Spf::Spf():spfrequest(NULL),spfresponse(NULL)
{
pthread_mutex_init(&mutex,NULL);
if(NULL==spfserver)
if(NULL==(spfserver=SPF_server_new(SPF_DNS_CACHE,0)))
throw Exception(_("Can't initialize SPF library"),__FILE__,__LINE__);
if(NULL==(spfrequest=SPF_request_new(spfserver)))
throw Exception(_("Can't initialize SPF request"),__FILE__,__LINE__);
}
/**
* destructor
*
* frees the memory of the spfrequest
*/
Spf::~Spf()
{
pthread_mutex_destroy(&mutex);
if(NULL!=spfrequest) SPF_request_free(spfrequest);
}
/**
* frees all memory related to the spf class
*
* this is needed because the common things are only initialized
* once (and are static), and when we close the program we need
* to deinitialize them
*/
void Spf::deinitialize()
{
if(NULL!=spfserver)
SPF_server_free(spfserver);
}
/**
* make a query to the dns system for an spf record
*
* highly inspired from fakehermes' source
*
* @param ip the ip of the remote server
* @param helo the hello string of the remote server
* @param from the envelope from address
*
* @returns true if it is not incorrect
*/
bool Spf::query(string ip,string helo,string from)
{
bool retval=false;
if(SPF_request_set_ipv4_str(spfrequest,ip.c_str()))
throw Exception(_("Error configuring IP for SPF request"),__FILE__,__LINE__);
if(SPF_request_set_helo_dom(spfrequest,helo.c_str()))
throw Exception(_("Error configuring HELO for SPF request"),__FILE__,__LINE__);
if(SPF_request_set_env_from(spfrequest,from.c_str()))
throw Exception(_("Error configuring FROM for SPF request"),__FILE__,__LINE__);
//make the actual query
pthread_mutex_lock(&mutex);
SPF_request_query_mailfrom(spfrequest,&spfresponse);
pthread_mutex_unlock(&mutex);
if(NULL!=spfresponse)
{
retval=(SPF_RESULT_FAIL==SPF_response_result(spfresponse)||SPF_RESULT_SOFTFAIL==SPF_response_result(spfresponse))?false:true;
SPF_response_free(spfresponse);
}
return retval;
}