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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 ArgusICMP
#define ArgusICMP
#endif
#include <stdio.h>
#include <ArgusModeler.h>
#include <ArgusOutput.h>
#include <ArgusSource.h>
#include <ArgusUtil.h>
int
ArgusCreateICMPFlow (struct ip *ip)
{
int retn = 0;
unsigned int *icmphdr = (unsigned int *) ArgusThisUpHdr;
struct icmp *icmp = (struct icmp *) icmphdr;
struct ArgusICMPFlow *icmpFlow = &ArgusThisFlow->icmp_flow;
ArgusThisDir = 0;
icmpFlow->ip_src = ip->ip_src.s_addr;
icmpFlow->ip_dst = ip->ip_dst.s_addr;
icmpFlow->ip_p = ip->ip_p;
if (STRUCTCAPTURED(*icmphdr)) {
icmpFlow->type = icmp->icmp_type;
icmpFlow->code = icmp->icmp_code;
if (ICMP_INFOTYPE(icmp->icmp_type)) {
switch (icmp->icmp_type) {
case ICMP_ECHOREPLY:
ArgusThisDir = 1;
case ICMP_ECHO:
icmpFlow->type = ICMP_ECHO;
icmpFlow->id = ntohs(icmp->icmp_id);
icmpFlow->ip_id = ntohs(icmp->icmp_seq);
break;
case ICMP_TSTAMPREPLY:
ArgusThisDir = 1;
case ICMP_TSTAMP:
icmpFlow->type = ICMP_TSTAMP;
break;
case ICMP_IREQREPLY:
ArgusThisDir = 1;
case ICMP_IREQ:
icmpFlow->type = ICMP_IREQ;
break;
case ICMP_MASKREPLY:
ArgusThisDir = 1;
case ICMP_MASKREQ:
icmpFlow->type = ICMP_MASKREQ;
break;
}
retn = 1;
} else {
struct ip *oip;
struct udphdr *ouh;
int hlen;
oip = &icmp->icmp_ip;
hlen = oip->ip_hl << 2;
ouh = (struct udphdr *) (((u_char *) oip) + hlen);
switch (icmp->icmp_type) {
case ICMP_UNREACH:
if (STRUCTCAPTURED(*icmp)) {
switch (icmp->icmp_code) {
case ICMP_UNREACH_PROTOCOL:
icmpFlow->id = (unsigned short) icmp->icmp_ip.ip_p;
break;
case ICMP_UNREACH_PORT:
icmpFlow->tp_p = oip->ip_p;
icmpFlow->id = ntohs((unsigned short) ouh->uh_dport);
break;
case ICMP_UNREACH_NET:
case ICMP_UNREACH_HOST:
bcopy ((char *) &icmp->icmp_ip.ip_dst.s_addr,
(char *)&icmpFlow->id, sizeof (int));
break;
}
retn = 1;
}
break;
case ICMP_REDIRECT:
if (STRUCTCAPTURED(*icmp)) {
switch (icmp->icmp_code) {
case ICMP_REDIRECT_TOSNET:
case ICMP_REDIRECT_TOSHOST:
icmpFlow->tp_p = oip->ip_tos;
case ICMP_REDIRECT_NET:
case ICMP_REDIRECT_HOST:
bcopy ((char *) &icmp->icmp_ip.ip_dst.s_addr, (char *)&icmpFlow->id, sizeof (int));
break;
}
retn = 1;
}
break;
default:
retn = 1;
break;
}
}
if (ArgusThisDir) {
unsigned int addr = icmpFlow->ip_src;
icmpFlow->ip_src = icmpFlow->ip_dst;
icmpFlow->ip_dst = addr;
}
}
#ifdef ARGUSDEBUG
ArgusDebug (8, "ArgusCreateICMPFlow(0x%x) returning %d\n", ip, retn);
#endif
return (retn);
}
#include <string.h>
#include <errno.h>
void
ArgusUpdateICMPState (struct ArgusFlowStruct *flowstr, unsigned char *state)
{
struct ip *ArgusTempIpHdr = ArgusThisIpHdr;
unsigned char *ArgusTempSnapEnd = ArgusThisSnapEnd;
struct icmp *icmp = (struct icmp *) ArgusThisUpHdr;
struct ArgusICMPObject *icmpObj = NULL;
ArgusUpdateAppState(flowstr, state);
if (*state == ARGUS_START) {
ArgusTallyTime (flowstr, *state);
ArgusTallyStats (flowstr, *state);
if ((icmpObj = (void *) ArgusCalloc (1, sizeof(struct ArgusICMPObject))) == NULL) {
ArgusLog (LOG_ERR, "ArgusUpdateICMPState: ArgusCalloc %s", strerror(errno));
} else {
if (flowstr->NetworkDSRBuffer != NULL)
ArgusFree (flowstr->NetworkDSRBuffer);
flowstr->NetworkDSRBuffer = icmpObj;
icmpObj->type = ARGUS_ICMP_DSR;
icmpObj->length = sizeof(*icmpObj);
icmpObj->icmp_type = icmp->icmp_type;
icmpObj->icmp_code = icmp->icmp_code;
icmpObj->iseq = ntohs(icmp->icmp_seq);
icmpObj->osrcaddr = ArgusThisIpHdr->ip_src.s_addr;
icmpObj->odstaddr = ArgusThisIpHdr->ip_dst.s_addr;
if (ICMP_INFOTYPE(icmp->icmp_type)) {
switch (icmp->icmp_type) {
case ICMP_ECHO:
case ICMP_IREQ:
case ICMP_MASKREQ:
case ICMP_TSTAMP:
icmpObj->status = ARGUS_REQUEST;
break;
case ICMP_MASKREPLY:
icmp->icmp_mask = ntohl(icmp->icmp_mask);
icmpObj->isrcaddr = icmp->icmp_mask;
case ICMP_ECHOREPLY:
case ICMP_IREQREPLY:
case ICMP_TSTAMPREPLY:
icmpObj->status = ARGUS_REPLY;
break;
}
} else {
struct ip oipbuf, *oip = &icmp->icmp_ip;
if ((long) oip & (sizeof (long) - 1)) {
bcopy ((char *)oip, (char *)&oipbuf, sizeof(struct ip));
oip = &oipbuf;
}
icmpObj->isrcaddr = ntohl(oip->ip_src.s_addr);
icmpObj->idstaddr = ntohl(oip->ip_dst.s_addr);
icmpObj->igwaddr = ntohl(icmp->icmp_gwaddr.s_addr);
}
}
} else {
flowstr->ArgusTimeout = ARGUS_IPTIMEOUT;
if (((icmpObj = flowstr->NetworkDSRBuffer) != NULL) &&
(icmpObj->type == ARGUS_ICMP_DSR)) {
if (ICMP_INFOTYPE(icmp->icmp_type)) {
if ((flowstr->state.src.count == 0) && (flowstr->state.dst.count == 0))
icmpObj->icmp_type = icmp->icmp_type;
switch (icmp->icmp_type) {
case ICMP_ECHO:
case ICMP_IREQ:
case ICMP_TSTAMP:
case ICMP_MASKREQ:
if (ArgusResponseStatus && (icmpObj->status == ARGUS_REQUEST)) {
ArgusSendFlowRecord (flowstr, ARGUS_STATUS);
}
*state = ARGUS_START;
icmpObj->icmp_type = icmp->icmp_type;
ArgusTallyTime (flowstr, *state);
ArgusTallyStats (flowstr, *state);
icmpObj->status = ARGUS_REQUEST;
break;
case ICMP_ECHOREPLY:
case ICMP_IREQREPLY:
case ICMP_TSTAMPREPLY:
case ICMP_MASKREPLY:
ArgusInProtocol = 1;
ArgusTallyTime (flowstr, *state);
ArgusTallyStats (flowstr, *state);
flowstr->state.status |= ARGUS_CONNECTED;
if (ArgusResponseStatus && (icmpObj->status == ARGUS_REQUEST))
ArgusSendFlowRecord (flowstr, ARGUS_STATUS);
icmpObj->status = ARGUS_REPLY;
break;
default:
ArgusTallyTime (flowstr, *state);
ArgusTallyStats (flowstr, *state);
if (flowstr->state.src.count && flowstr->state.dst.count)
flowstr->state.status |= ARGUS_CONNECTED;
else
flowstr->state.status &= ~ARGUS_CONNECTED;
break;
}
} else {
ArgusTallyTime (flowstr, *state);
ArgusTallyStats (flowstr, *state);
}
} else
icmpObj = NULL;
}
if (!(ICMP_INFOTYPE(icmp->icmp_type))) {
struct ArgusFlowStruct *flow = NULL;
struct ArgusFlowStats *ArgusThisStats = NULL;
struct ip *oip = &icmp->icmp_ip;
int hlen = oip->ip_hl << 2;
ArgusThisIpHdr = NULL;
ArgusThisSnapEnd = ((unsigned char *)oip) + (hlen + 4);
ArgusCreateIPFlow(oip);
if (ArgusThisIpHdr) {
ArgusThisUpHdr = (unsigned char *) ArgusThisIpHdr;
ArgusThisSnapEnd = (unsigned char *) ArgusThisIpHdr;
if ((flow = ArgusFindFlow()) != NULL) {
if (flow->state.rev == ArgusThisDir)
ArgusThisStats = &flow->state.src;
else
ArgusThisStats = &flow->state.dst;
if (icmpObj && ((ArgusThisStats->ip_id == ArgusThisIpHdr->ip_id) ||
(ArgusThisStats->ip_id == htons(ArgusThisIpHdr->ip_id)))) { /* who sends ip_id messed up? */
if (flow->ICMPDSRBuffer == NULL)
if ((flow->ICMPDSRBuffer = (void *) ArgusCalloc (1, sizeof(struct ArgusICMPObject))) == NULL)
ArgusLog (LOG_ERR, "ArgusUpdateICMPState: ArgusCalloc %s", strerror(errno));
bcopy (icmpObj, flow->ICMPDSRBuffer, sizeof(*icmpObj));
switch (icmp->icmp_type) {
case ICMP_UNREACH:
flow->state.status |= ARGUS_ICMPUNREACH_MAPPED; break;
case ICMP_REDIRECT:
flow->state.status |= ARGUS_ICMPREDIREC_MAPPED; break;
case ICMP_TIMXCEED:
flow->state.status |= ARGUS_ICMPTIMXCED_MAPPED; break;
}
flow->state.lasttime = ArgusGlobalTime;
if (ArgusResponseStatus && ((flow->state.src.count + flow->state.dst.count) == 1))
ArgusSendFlowRecord(flow, ARGUS_STOP);
}
}
}
ArgusThisIpHdr = ArgusTempIpHdr;
ArgusThisSnapEnd = ArgusTempSnapEnd;
}
#ifdef ARGUSDEBUG
ArgusDebug (8, "ArgusUpdateICMPState(0x%x, %d) returning\n", flowstr, state);
#endif
}
#include <argus_out.h>
void
ArgusICMPFlowRecord (struct ArgusFlowStruct *flow, struct ArgusRecord *argus, unsigned char state)
{
int length = 0;
struct ArgusICMPObject *icmpObj = (struct ArgusICMPObject *) flow->NetworkDSRBuffer;
if (icmpObj && ((length = argus->ahdr.length) > 0)) {
bcopy ((char *)icmpObj, &((char *)argus)[argus->ahdr.length], sizeof(*icmpObj));
argus->ahdr.length += sizeof(*icmpObj);
}
#ifdef ARGUSDEBUG
ArgusDebug (5, "ArgusICMPFlowRecord(0x%x, 0x%x, %d) returning\n", flow, argus, state);
#endif
}
void
ArgusICMPMappedFlowRecord (struct ArgusFlowStruct *flow, struct ArgusRecord *argus, unsigned char state)
{
int length = 0;
struct ArgusICMPObject *icmpObj = (struct ArgusICMPObject *) flow->ICMPDSRBuffer;
if (icmpObj && ((length = argus->ahdr.length) > 0)) {
bcopy ((char *)icmpObj, &((char *)argus)[argus->ahdr.length], sizeof(*icmpObj));
argus->ahdr.length += sizeof(*icmpObj);
}
#ifdef ARGUSDEBUG
ArgusDebug (5, "ArgusICMPMappedFlowRecord(0x%x, 0x%x, %d) returning\n", flow, argus, state);
#endif
}
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