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/* Copyright (C) 2007-2010 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 Victor Julien <victor@inliniac.net>
* \author Pablo Rincon <pablo.rincon.crespo@gmail.com>
*
* Flow level variable support for complex detection rules
* Supported types atm are String and Integers
*/
#include "suricata-common.h"
#include "threads.h"
#include "flow-var.h"
#include "flow.h"
#include "detect.h"
#include "util-debug.h"
/* puts a new value into a flowvar */
static void FlowVarUpdateStr(FlowVar *fv, uint8_t *value, uint16_t size)
{
if (fv->data.fv_str.value)
SCFree(fv->data.fv_str.value);
fv->data.fv_str.value = value;
fv->data.fv_str.value_len = size;
}
/* puts a new value into a flowvar */
static void FlowVarUpdateInt(FlowVar *fv, uint32_t value)
{
fv->data.fv_int.value = value;
}
/** \brief get the flowvar with index 'idx' from the flow
* \note flow is not locked by this function, caller is
* responsible
*/
FlowVar *FlowVarGet(Flow *f, uint16_t idx)
{
GenericVar *gv = f->flowvar;
for ( ; gv != NULL; gv = gv->next) {
if (gv->type == DETECT_FLOWVAR && gv->idx == idx)
return (FlowVar *)gv;
}
return NULL;
}
/* add a flowvar to the flow, or update it */
void FlowVarAddStrNoLock(Flow *f, uint16_t idx, uint8_t *value, uint16_t size)
{
FlowVar *fv = FlowVarGet(f, idx);
if (fv == NULL) {
fv = SCMalloc(sizeof(FlowVar));
if (unlikely(fv == NULL))
return;
fv->type = DETECT_FLOWVAR;
fv->datatype = FLOWVAR_TYPE_STR;
fv->idx = idx;
fv->data.fv_str.value = value;
fv->data.fv_str.value_len = size;
fv->next = NULL;
GenericVarAppend(&f->flowvar, (GenericVar *)fv);
} else {
FlowVarUpdateStr(fv, value, size);
}
}
/* add a flowvar to the flow, or update it */
void FlowVarAddStr(Flow *f, uint16_t idx, uint8_t *value, uint16_t size)
{
FLOWLOCK_WRLOCK(f);
FlowVarAddStrNoLock(f, idx, value, size);
FLOWLOCK_UNLOCK(f);
}
/* add a flowvar to the flow, or update it */
void FlowVarAddIntNoLock(Flow *f, uint16_t idx, uint32_t value)
{
FlowVar *fv = FlowVarGet(f, idx);
if (fv == NULL) {
fv = SCMalloc(sizeof(FlowVar));
if (unlikely(fv == NULL))
return;
fv->type = DETECT_FLOWVAR;
fv->datatype = FLOWVAR_TYPE_INT;
fv->idx = idx;
fv->data.fv_int.value= value;
fv->next = NULL;
GenericVarAppend(&f->flowvar, (GenericVar *)fv);
} else {
FlowVarUpdateInt(fv, value);
}
}
/* add a flowvar to the flow, or update it */
void FlowVarAddInt(Flow *f, uint16_t idx, uint32_t value)
{
FLOWLOCK_WRLOCK(f);
FlowVarAddIntNoLock(f, idx, value);
FLOWLOCK_UNLOCK(f);
}
void FlowVarFree(FlowVar *fv)
{
if (fv == NULL)
return;
if (fv->datatype == FLOWVAR_TYPE_STR) {
if (fv->data.fv_str.value != NULL)
SCFree(fv->data.fv_str.value);
}
SCFree(fv);
}
void FlowVarPrint(GenericVar *gv)
{
uint16_t u;
if (!SCLogDebugEnabled())
return;
if (gv == NULL)
return;
if (gv->type == DETECT_FLOWVAR || gv->type == DETECT_FLOWINT) {
FlowVar *fv = (FlowVar *)gv;
if (fv->datatype == FLOWVAR_TYPE_STR) {
SCLogDebug("Name idx \"%" PRIu16 "\", Value \"", fv->idx);
for (u = 0; u < fv->data.fv_str.value_len; u++) {
if (isprint(fv->data.fv_str.value[u]))
SCLogDebug("%c", fv->data.fv_str.value[u]);
else
SCLogDebug("\\%02X", fv->data.fv_str.value[u]);
}
SCLogDebug("\", Len \"%" PRIu16 "\"\n", fv->data.fv_str.value_len);
} else if (fv->datatype == FLOWVAR_TYPE_INT) {
SCLogDebug("Name idx \"%" PRIu16 "\", Value \"%" PRIu32 "\"", fv->idx,
fv->data.fv_int.value);
} else {
SCLogDebug("Unknown data type at flowvars\n");
}
}
FlowVarPrint(gv->next);
}
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