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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>
*
* Implements per packet vars
*
* \todo move away from a linked list implementation
* \todo use different datatypes, such as string, int, etc.
* \todo have more than one instance of the same var, and be able to match on a
* specific one, or one all at a time. So if a certain capture matches
* multiple times, we can operate on all of them.
*/
#include "suricata-common.h"
#include "decode.h"
#include "pkt-var.h"
#include "util-debug.h"
/* puts a new value into a pktvar */
void PktVarUpdate(PktVar *pv, uint8_t *value, uint16_t size)
{
if (pv->value) SCFree(pv->value);
pv->value = value;
pv->value_len = size;
}
/* get the pktvar with name 'name' from the pkt
*
* name is a normal string*/
PktVar *PktVarGet(Packet *p, char *name)
{
PktVar *pv = p->pktvar;
for (;pv != NULL; pv = pv->next) {
if (pv->name && strcmp(pv->name, name) == 0)
return pv;
}
return NULL;
}
/* add a pktvar to the pkt, or update it */
void PktVarAdd(Packet *p, char *name, uint8_t *value, uint16_t size)
{
//printf("Adding packet var \"%s\" with value(%" PRId32 ") \"%s\"\n", name, size, value);
PktVar *pv = PktVarGet(p, name);
if (pv == NULL) {
pv = SCMalloc(sizeof(PktVar));
if (unlikely(pv == NULL))
return;
pv->name = name;
pv->value = value;
pv->value_len = size;
pv->next = NULL;
PktVar *tpv = p->pktvar;
if (p->pktvar == NULL) p->pktvar = pv;
else {
while(tpv) {
if (tpv->next == NULL) {
tpv->next = pv;
return;
}
tpv = tpv->next;
}
}
} else {
PktVarUpdate(pv, value, size);
}
}
void PktVarFree(PktVar *pv)
{
if (pv == NULL)
return;
pv->name = NULL;
if (pv->value != NULL)
SCFree(pv->value);
PktVar *pv_next = pv->next;
SCFree(pv);
if (pv_next != NULL)
PktVarFree(pv_next);
}
void PktVarPrint(PktVar *pv)
{
uint16_t i;
if (pv == NULL)
return;
printf("Name \"%s\", Value \"", pv->name);
for (i = 0; i < pv->value_len; i++) {
if (isprint(pv->value[i])) printf("%c", pv->value[i]);
else printf("\\%02X", pv->value[i]);
}
printf("\", Len \"%" PRIu32 "\"\n", pv->value_len);
PktVarPrint(pv->next);
}
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