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/* Copyright (C) 2007-2013 Open Information Security Foundation
*
* You can copy, redistribute or modify this Program under the terms of
* the GNU General Public License version 2 as published by the Free
* Software Foundation.
*
* 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
* version 2 along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/**
* \file
*
* \author Giuseppe Longo <giuseppelng@gmail.com>
*
*/
#include "suricata-common.h"
#include "queue.h"
#include "suricata.h"
#include "conf.h"
#include "util-debug.h"
#include "util-misc.h"
#include "defrag-config.h"
static SCRadixTree *defrag_tree = NULL;
static int default_timeout = 0;
static void DefragPolicyFreeUserData(void *data)
{
if (data != NULL)
SCFree(data);
return;
}
static void DefragPolicyAddHostInfo(char *host_ip_range, uint64_t timeout)
{
uint64_t *user_data = NULL;
if ( (user_data = SCMalloc(sizeof(uint64_t))) == NULL) {
SCLogError(SC_ERR_FATAL, "Error allocating memory. Exiting");
exit(EXIT_FAILURE);
}
*user_data = timeout;
if (strchr(host_ip_range, ':') != NULL) {
SCLogDebug("adding ipv6 host %s", host_ip_range);
if (SCRadixAddKeyIPV6String(host_ip_range, defrag_tree, (void *)user_data) == NULL) {
SCLogWarning(SC_ERR_INVALID_VALUE,
"failed to add ipv6 host %s", host_ip_range);
}
} else {
SCLogDebug("adding ipv4 host %s", host_ip_range);
if (SCRadixAddKeyIPV4String(host_ip_range, defrag_tree, (void *)user_data) == NULL) {
SCLogWarning(SC_ERR_INVALID_VALUE,
"failed to add ipv4 host %s", host_ip_range);
}
}
}
static int DefragPolicyGetIPv4HostTimeout(uint8_t *ipv4_addr)
{
void *user_data = NULL;
(void)SCRadixFindKeyIPV4BestMatch(ipv4_addr, defrag_tree, &user_data);
if (user_data == NULL)
return -1;
return *((int *)user_data);
}
static int DefragPolicyGetIPv6HostTimeout(uint8_t *ipv6_addr)
{
void *user_data = NULL;
(void)SCRadixFindKeyIPV6BestMatch(ipv6_addr, defrag_tree, &user_data);
if (user_data == NULL)
return -1;
return *((int *)user_data);
}
int DefragPolicyGetHostTimeout(Packet *p)
{
int timeout = 0;
if (PKT_IS_IPV4(p))
timeout = DefragPolicyGetIPv4HostTimeout((uint8_t *)GET_IPV4_DST_ADDR_PTR(p));
else if (PKT_IS_IPV6(p))
timeout = DefragPolicyGetIPv6HostTimeout((uint8_t *)GET_IPV6_DST_ADDR(p));
if (timeout <= 0)
timeout = default_timeout;
return timeout;
}
static void DefragParseParameters(ConfNode *n)
{
ConfNode *si;
uint64_t timeout = 0;
TAILQ_FOREACH(si, &n->head, next) {
if (strcasecmp("timeout", si->name) == 0) {
SCLogDebug("timeout value %s", si->val);
if (ParseSizeStringU64(si->val, &timeout) < 0) {
SCLogError(SC_ERR_SIZE_PARSE, "Error parsing timeout "
"from conf file");
}
}
if (strcasecmp("address", si->name) == 0) {
ConfNode *pval;
TAILQ_FOREACH(pval, &si->head, next) {
DefragPolicyAddHostInfo(pval->val, timeout);
}
}
}
}
void DefragSetDefaultTimeout(intmax_t timeout)
{
default_timeout = timeout;
SCLogDebug("default timeout %d", default_timeout);
}
void DefragPolicyLoadFromConfig(void)
{
SCEnter();
defrag_tree = SCRadixCreateRadixTree(DefragPolicyFreeUserData, NULL);
if (defrag_tree == NULL) {
SCLogError(SC_ERR_MEM_ALLOC,
"Can't alloc memory for the defrag config tree.");
exit(EXIT_FAILURE);
}
ConfNode *server_config = ConfGetNode("defrag.host-config");
if (server_config == NULL) {
SCLogDebug("failed to read host config");
SCReturn;
}
SCLogDebug("configuring host config %p", server_config);
ConfNode *sc;
TAILQ_FOREACH(sc, &server_config->head, next) {
ConfNode *p = NULL;
TAILQ_FOREACH(p, &sc->head, next) {
SCLogDebug("parsing configuration for %s", p->name);
DefragParseParameters(p);
}
}
}
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