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/*
* Copyright (c) 2000-2004 QoSient, LLC
* All rights reserved.
*
* 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; either version 2, or (at your option)
* any later version.
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#ifndef ArgusEsp
#define ArgusEsp
#endif
#include <stdio.h>
#include <ArgusModeler.h>
#include <errno.h>
#include <string.h>
struct esphdr {
unsigned int spi, seq;
};
int
ArgusCreateESPFlow (struct ip *ip)
{
int retn = 0;
struct ArgusESPFlow *espFlow = &ArgusThisFlow->esp_flow;
struct esphdr *esp = (struct esphdr *) ArgusThisUpHdr;
ArgusThisDir = 0;
if (STRUCTCAPTURED(*esp)) {
espFlow->ip_src = ip->ip_src.s_addr;
espFlow->ip_dst = ip->ip_dst.s_addr;
espFlow->ip_p = ip->ip_p;
espFlow->spi = esp->spi;
#ifdef _LITTLE_ENDIAN
espFlow->spi = ntohl(espFlow->spi);
#endif
if (espFlow->ip_src < espFlow->ip_dst) {
espFlow->ip_src = ip->ip_dst.s_addr;
espFlow->ip_dst = ip->ip_src.s_addr;
ArgusThisDir = 1;
}
retn = 1;
}
#ifdef ARGUSDEBUG
ArgusDebug (4, "ArgusCreateESPFlow(0x%x) returning %d\n", ip, retn);
#endif
return (retn);
}
void
ArgusUpdateESPState (struct ArgusFlowStruct *flowstr, unsigned char *state)
{
struct esphdr *esp = (struct esphdr *) ArgusThisUpHdr;
struct ArgusESPStruct *espObject = NULL;
struct ArgusESPObject *ArgusThisEsp;
ArgusTallyTime (flowstr, *state);
if (STRUCTCAPTURED(*esp)) {
#ifdef _LITTLE_ENDIAN
esp->spi = ntohl(esp->spi);
esp->seq = ntohl(esp->seq);
#endif
if (*state == ARGUS_START) {
if (flowstr->TransportDSRBuffer)
ArgusFree(flowstr->TransportDSRBuffer);
if ((flowstr->TransportDSRBuffer = (struct ArgusESPStruct *) ArgusCalloc (1,
sizeof (struct ArgusESPStruct))) == NULL) {
ArgusLog (LOG_ERR, "%s: ArgusUpdateEspState: ArgusCalloc failed %s\n", ArgusProgramName, strerror(errno));
} else {
espObject = flowstr->TransportDSRBuffer;
espObject->type = ARGUS_ESP_DSR;
espObject->length = sizeof(*espObject);
espObject->status = ARGUS_START;
}
espObject->src.spi = esp->spi;
espObject->dst.spi = esp->spi;
if (flowstr->state.rev == ArgusThisDir)
ArgusThisEsp = &espObject->src;
else
ArgusThisEsp = &espObject->dst;
ArgusThisEsp->lastseq = esp->seq;
} else {
flowstr->ArgusTimeout = ARGUS_IPTIMEOUT;
if ((espObject = flowstr->TransportDSRBuffer) != NULL) {
if (flowstr->state.rev == ArgusThisDir)
ArgusThisEsp = &espObject->src;
else
ArgusThisEsp = &espObject->dst;
if (esp->spi == ArgusThisEsp->spi) {
if (ArgusThisEsp->lastseq && (esp->seq != (ArgusThisEsp->lastseq + 1))) {
ArgusThisEsp->lostseq++;
espObject->status |= ARGUS_SRC_PKTS_RETRANS;
}
ArgusThisEsp->lastseq = esp->seq;
}
}
}
}
#ifdef ARGUSDEBUG
ArgusDebug (8, "ArgusUpdateESPState(0x%x, %d) returning\n", flowstr, *state);
#endif
}
#include <argus_out.h>
void
ArgusESPFlowRecord (struct ArgusFlowStruct *flow, struct ArgusRecord *argus, unsigned char state)
{
int length = 0;
struct ArgusESPStruct *esp = (struct ArgusESPStruct *) flow->TransportDSRBuffer;
if (esp && ((length = argus->ahdr.length) > 0)) {
bcopy ((char *)esp, &((char *)argus)[argus->ahdr.length], sizeof(*esp));
argus->ahdr.length += sizeof(*esp);
esp->src.lostseq = 0;
esp->dst.lostseq = 0;
}
#ifdef ARGUSDEBUG
ArgusDebug (4, "ArgusESPFlowRecord(0x%x, 0x%x, %d) returning\n", flow, argus, state);
#endif
}
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