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ip.c
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/*
* -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
*
* http://www.ntop.org
*
* Copyright (C) 1998-2012 Luca Deri <[email protected]>
*
* -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
*
* 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 of the License, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "ntop.h"
/* ***************************************** */
static u_char ethBroadcast[] = { 255, 255, 255, 255, 255, 255 };
/* ***************************************** */
/* *****************************************
*
* Fragment handling code courtesy of
* Andreas Pfaller <[email protected]>
*
* NOTE:
* the code below has a small (neglictable) limitation
* as described below.
*
* Subject: ntop 1.3.2: Fragment handling
* Date: Mon, 7 Aug 2000 16:05:45 +0200
* From: [email protected] (Andreas Pfaller)
* To: [email protected] (Luca Deri)
*
* I have also had a look at the code you added to handle
* overlapping fragments. It again assumes specific package
* ordering (either 1,2,..,n or n,n-1,..,1) which the IP protocol
* does not guarantee. The above assumptions are probably true
* for most users but in some setups they are nearly never true.
* Consider two host connected by multiple network cards
*
* e.g.:
* +--------+ eth0 eth0 +--------+
* | |-------------------| |
* | HOST A | | HOST B |
* | |-------------------| |
* +--------+ eth1 eth1 +--------+
*
* which distribute traffic on this interfaces to achive better
* throughput (Called bonding in Linux, Etherchannel by Cisco or
* trunking by Sun). A simple algorithm simple uses the interfaces
* in a cyclic way. Since packets are not always the same length
* or the interfaces my have different speeds more complicated
* ones use other methods to try to achive maximum throughput.
* In such an environment you have very high probability for
* out of order packets.
*
* ***************************************** */
#ifdef FRAGMENT_DEBUG
static void dumpFragmentData(IpFragment *fragment) {
printf("FRAGMENT_DEBUG: IPFragment: (%p)\n", fragment);
printf(" %s:%d->%s:%d\n",
fragment->src->hostResolvedName, fragment->sport,
fragment->dest->hostResolvedName, fragment->dport);
printf(" FragmentId=%d\n", fragment->fragmentId);
printf(" lastOffset=%d, totalPacketLength=%d\n",
fragment->lastOffset, fragment->totalPacketLength);
printf(" totalDataLength=%d, expectedDataLength=%d\n",
fragment->totalDataLength, fragment->expectedDataLength);
fflush(stdout);
}
#endif
/* ************************************ */
static IpFragment *searchFragment(HostTraffic *srcHost,
HostTraffic *dstHost,
u_int fragmentId,
int actualDeviceId) {
IpFragment *fragment = myGlobals.device[actualDeviceId].fragmentList;
while ((fragment != NULL)
&& ((fragment->src != srcHost)
|| (fragment->dest != dstHost)
|| (fragment->fragmentId != fragmentId)))
fragment = fragment->next;
return(fragment);
}
/* ************************************ */
void deleteFragment(IpFragment *fragment, int actualDeviceId) {
if(fragment->prev == NULL)
myGlobals.device[actualDeviceId].fragmentList = fragment->next;
else
fragment->prev->next = fragment->next;
free(fragment);
myGlobals.num_queued_fragments--;
}
/* ************************************ */
/* Courtesy of Andreas Pfaller <[email protected]> */
static void checkFragmentOverlap(HostTraffic *srcHost,
HostTraffic *dstHost,
IpFragment *fragment,
u_int fragmentOffset,
u_int dataLength,
int actualDeviceId,
const struct pcap_pkthdr *h, const u_char *p) {
if(fragment->fragmentOrder == FLAG_UNKNOWN_FRAGMENT_ORDER) {
if(fragment->lastOffset > fragmentOffset)
fragment->fragmentOrder = FLAG_DECREASING_FRAGMENT_ORDER;
else
fragment->fragmentOrder = FLAG_INCREASING_FRAGMENT_ORDER;
}
if((fragment->fragmentOrder == FLAG_INCREASING_FRAGMENT_ORDER
&& fragment->lastOffset+fragment->lastDataLength > fragmentOffset)
||
(fragment->fragmentOrder == FLAG_DECREASING_FRAGMENT_ORDER
&& fragment->lastOffset < fragmentOffset+dataLength)) {
if(myGlobals.runningPref.enableSuspiciousPacketDump) {
char buf[LEN_GENERAL_WORK_BUFFER];
safe_snprintf(__FILE__, __LINE__, buf, LEN_GENERAL_WORK_BUFFER,
"Detected overlapping packet fragment [%s->%s]: "
"fragment id=%d, actual offset=%d, previous offset=%d\n",
fragment->src->hostResolvedName,
fragment->dest->hostResolvedName,
fragment->fragmentId, fragmentOffset,
fragment->lastOffset);
dumpSuspiciousPacket(actualDeviceId, h, p);
}
allocateSecurityHostPkts(fragment->src); allocateSecurityHostPkts(fragment->dest);
incrementUsageCounter(&fragment->src->secHostPkts->overlappingFragmentSent,
dstHost, actualDeviceId);
incrementUsageCounter(&fragment->dest->secHostPkts->overlappingFragmentRcvd,
srcHost, actualDeviceId);
incrementTrafficCounter(&myGlobals.device[actualDeviceId].securityPkts.overlappingFragment, 1);
}
}
/* ************************************ */
static u_int handleFragment(HostTraffic *srcHost,
HostTraffic *dstHost,
u_short *sport,
u_short *dport,
u_int fragmentId,
u_int off,
u_int packetLength,
u_int dataLength,
int actualDeviceId,
const struct pcap_pkthdr *h, const u_char *p) {
IpFragment *fragment;
u_int fragmentOffset, length;
if(!myGlobals.enableFragmentHandling)
return(0);
accessMutex(&myGlobals.fragmentMutex, "handleFragment");
fragmentOffset = (off & 0x1FFF)*8;
fragment = searchFragment(srcHost, dstHost, fragmentId, actualDeviceId);
if(fragment == NULL) {
/* new fragment */
fragment = (IpFragment*)calloc(1, sizeof(IpFragment));
if(fragment == NULL) return(0); /* out of memory, not much we can do */
memset(fragment, 0, sizeof(IpFragment));
fragment->src = srcHost, fragment->dest = dstHost;
fragment->fragmentId = fragmentId, fragment->firstSeen = myGlobals.actTime;
fragment->fragmentOrder = FLAG_UNKNOWN_FRAGMENT_ORDER;
fragment->next = myGlobals.device[actualDeviceId].fragmentList, fragment->prev = NULL;
if(fragment->next) fragment->next->prev = fragment;
myGlobals.device[actualDeviceId].fragmentList = fragment;
myGlobals.num_queued_fragments++;
} else
checkFragmentOverlap(srcHost, dstHost, fragment,
fragmentOffset, dataLength,
actualDeviceId, h, p);
fragment->lastOffset = fragmentOffset;
fragment->totalPacketLength += packetLength;
fragment->totalDataLength += dataLength;
fragment->lastDataLength = dataLength;
if(fragmentOffset == 0) {
/* first fragment contains port numbers */
fragment->sport = *sport;
fragment->dport = *dport;
} else if(!(off & IP_MF)) /* last fragment->we know the total data size */
fragment->expectedDataLength = fragmentOffset+dataLength;
#ifdef FRAGMENT_DEBUG
dumpFragmentData(fragment);
#endif
/* Now check if we have all the data needed for the statistics */
if((fragment->sport != 0) && (fragment->dport != 0) /* first fragment rcvd */
/* last fragment rcvd */
&& (fragment->expectedDataLength != 0)
/* probably all fragments rcvd */
&& (fragment->totalDataLength >= fragment->expectedDataLength)) {
*sport = fragment->sport;
*dport = fragment->dport;
length = fragment->totalPacketLength;
deleteFragment(fragment, actualDeviceId);
} else {
*sport = 0;
*dport = 0;
length = 0;
}
releaseMutex(&myGlobals.fragmentMutex);
return length;
}
/* ************************************ */
void purgeOldFragmentEntries(int actualDeviceId) {
IpFragment *fragment, *next;
#ifdef FRAGMENT_DEBUG
u_int fragcnt=0, expcnt=0;
#endif
accessMutex(&myGlobals.fragmentMutex, "purgeOldFragmentEntries");
fragment = myGlobals.device[actualDeviceId].fragmentList;
while(fragment != NULL) {
#ifdef FRAGMENT_DEBUG
fragcnt++;
#endif
next = fragment->next;
if((fragment->firstSeen + 30 /* sec */) < myGlobals.actTime) {
#ifdef FRAGMENT_DEBUG
expcnt++;
dumpFragmentData(fragment);
#endif
if(fragment->prev) fragment->prev = next;
if(next) next->prev = fragment->prev;
deleteFragment(fragment, actualDeviceId);
}
fragment = next;
}
releaseMutex(&myGlobals.fragmentMutex);
#ifdef FRAGMENT_DEBUG
if(fragcnt) {
printf("FRAGMENT_DEBUG: fragcnt=%d, expcnt=%d\n", fragcnt, expcnt);
fflush(stdout);
}
#endif
}
/* ************************************ */
/*
Fingerprint code courtesy of ettercap
http://ettercap.sourceforge.net
*/
static u_char TTL_PREDICTOR(u_char x) /* coded by awgn <[email protected]> */
{ /* round the TTL to the nearest power of 2 (ceiling) */
register u_char i = x;
register u_char j = 1;
register u_char c = 0;
do {
c += i & 1;
j <<= 1;
} while ( i >>= 1 );
if( c == 1 )
return x;
else
return ( j ? j : 0xff );
}
/* ************************************ */
static void updateRoutedTraffic(HostTraffic *router, Counter bytes) {
if(router != NULL) {
if(router->routedTraffic == NULL) {
int mallocLen = sizeof(RoutingCounter);
router->routedTraffic = (RoutingCounter*)malloc(mallocLen);
if(router->routedTraffic == NULL) return;
memset(router->routedTraffic, 0, mallocLen);
}
if(router->routedTraffic != NULL) { /* malloc() didn't fail */
incrementTrafficCounter(&router->routedTraffic->routedPkts, 1);
incrementTrafficCounter(&router->routedTraffic->routedBytes, bytes);
}
}
}
/* ************************************ */
static void updateDevicePacketTTLStats(u_int ttl, int actualDeviceId) {
if(ttl <= 32) incrementTrafficCounter(&myGlobals.device[actualDeviceId].rcvdPktTTLStats.upTo32, 1);
else if(ttl <= 64) incrementTrafficCounter(&myGlobals.device[actualDeviceId].rcvdPktTTLStats.upTo64, 1);
else if(ttl <= 96) incrementTrafficCounter(&myGlobals.device[actualDeviceId].rcvdPktTTLStats.upTo96, 1);
else if(ttl <= 128) incrementTrafficCounter(&myGlobals.device[actualDeviceId].rcvdPktTTLStats.upTo128, 1);
else if(ttl <= 160) incrementTrafficCounter(&myGlobals.device[actualDeviceId].rcvdPktTTLStats.upTo160, 1);
else if(ttl <= 192) incrementTrafficCounter(&myGlobals.device[actualDeviceId].rcvdPktTTLStats.upTo192, 1);
else if(ttl <= 224) incrementTrafficCounter(&myGlobals.device[actualDeviceId].rcvdPktTTLStats.upTo224, 1);
else incrementTrafficCounter(&myGlobals.device[actualDeviceId].rcvdPktTTLStats.upTo255, 1);
}
/* ************************************ */
static void checkNetworkRouter(HostTraffic *srcHost, HostTraffic *dstHost,
u_char *ether_dst, int actualDeviceId,
Counter bytes,
const struct pcap_pkthdr *h, const u_char *p) {
if(ether_dst == NULL) return;
if((subnetLocalHost(srcHost) && (!subnetLocalHost(dstHost))
&& (!broadcastHost(dstHost)) && (!multicastHost(dstHost)))
|| (subnetLocalHost(dstHost) && (!subnetLocalHost(srcHost))
&& (!broadcastHost(srcHost)) && (!multicastHost(srcHost)))) {
HostTraffic *router = lookupHost(NULL, ether_dst, srcHost->vlanId, 0, 0, actualDeviceId, h, p);
if(router == NULL) return;
if(((router->hostNumIpAddress[0] != '\0')
&& (broadcastHost(router)
|| multicastHost(router)
|| (!subnetLocalHost(router)) /* No IP: is this a special Multicast address ? */))
|| (addrcmp(&router->hostIpAddress,&dstHost->hostIpAddress) == 0)
|| (memcmp(router->ethAddress, dstHost->ethAddress, LEN_ETHERNET_ADDRESS) == 0)
)
return;
#ifdef DEBUG
traceEvent(CONST_TRACE_INFO, "(%s/%s/%s) -> (%s/%s/%s) routed by [%s/%s/%s]",
srcHost->ethAddressString, srcHost->hostNumIpAddress, srcHost->hostResolvedName,
dstHost->ethAddressString, dstHost->hostNumIpAddress, dstHost->hostResolvedName,
router->ethAddressString,
router->hostNumIpAddress,
router->hostResolvedName);
#endif
setHostFlag(FLAG_GATEWAY_HOST, router);
updateRoutedTraffic(router, bytes);
}
}
/* ************************************ */
void processIpPkt(const u_char *bp, /* Pointer to IP */
const struct pcap_pkthdr *h,
const u_char *p, /* Original packet */
u_int ip_offset, u_int length,
u_char *ether_src,
u_char *ether_dst,
int actualDeviceId,
int vlanId) {
u_short sport=0, dport=0;
struct ip ip;
struct ip6_hdr *ip6;
struct icmp6_hdr icmp6Pkt;
u_int advance = 0;
u_char *cp = NULL;
u_char *snapend = NULL;
u_int icmp6len = 0;
u_int nh;
int fragmented = 0;
struct tcphdr tp;
struct udphdr up;
struct icmp icmpPkt;
u_int hlen, ip_len, tcpDataLength, udpDataLength, off=0, tcpUdpLen, idx;
HostTraffic *srcHost=NULL, *dstHost=NULL;
HostAddr srcAddr, dstAddr; /* Protocol Independent addresses */
u_char forceUsingIPaddress = 0;
struct timeval tvstrct;
u_char *theData, found = 0;
TrafficCounter ctr;
ProtocolsList *protoList;
u_short newSession = 0;
u_short nonFullyRemoteSession = 1;
/* Need to copy this over in case bp isn't properly aligned.
* This occurs on SunOS 4.x at least.
*
* Paul D. Smith <[email protected]>
*/
memcpy(&ip, bp, sizeof(struct ip));
/* TODO: isipv6 = (ip.ip_v == 6)?1:0; */
if(ip.ip_v == 6) {
/* handle IPv6 packets */
ip6 = (struct ip6_hdr *)bp;
} else
ip6 = NULL;
if(ip6)
hlen = sizeof(struct ip6_hdr);
else
hlen = (u_int)ip.ip_hl * 4;
incrementTrafficCounter(&myGlobals.device[actualDeviceId].ipPkts, 1);
/*
Fix below courtesy of Christian Hammers <[email protected]>
*/
if(ip6)
incrementTrafficCounter(&myGlobals.device[actualDeviceId].ipv6Bytes, length /* ntohs(ip.ip_len) */);
else
incrementTrafficCounter(&myGlobals.device[actualDeviceId].ipv4Bytes, length /* ntohs(ip.ip_len) */);
if(ip6 == NULL) {
if(ip.ip_p == CONST_GRE_PROTOCOL_TYPE) {
/*
Cisco GRE (Generic Routing Encapsulation) Tunnels (RFC 1701, 1702)
*/
GreTunnel tunnel;
PPPTunnelHeader pppTHeader;
memcpy(&tunnel, bp+hlen, sizeof(GreTunnel));
switch(ntohs(tunnel.protocol)) {
case CONST_PPP_PROTOCOL_TYPE:
memcpy(&pppTHeader, bp+hlen+sizeof(GreTunnel), sizeof(PPPTunnelHeader));
if(ntohs(pppTHeader.protocol) == 0x21 /* IP */) {
memcpy(&ip, bp+hlen+sizeof(GreTunnel)+sizeof(PPPTunnelHeader), sizeof(struct ip));
hlen = (u_int)ip.ip_hl * 4;
ether_src = NULL, ether_dst = NULL;
}
break;
case ETHERTYPE_IP:
memcpy(&ip, bp+hlen+4 /* 4 is the size of the GRE header */, sizeof(struct ip));
hlen = (u_int)ip.ip_hl * 4;
ether_src = NULL, ether_dst = NULL;
break;
}
}
}
if((ether_src == NULL) && (ether_dst == NULL)) {
/* Ethernet-less protocols (e.g. PPP/RAW IP) */
forceUsingIPaddress = 1;
}
if(ip6) {
addrput(AF_INET6, &srcAddr, &ip6->ip6_src);
addrput(AF_INET6, &dstAddr, &ip6->ip6_dst);
} else {
NTOHL(ip.ip_dst.s_addr); NTOHL(ip.ip_src.s_addr);
addrput(AF_INET, &srcAddr,&ip.ip_src.s_addr);
addrput(AF_INET, &dstAddr,&ip.ip_dst.s_addr);
}
if(ip6 == NULL) {
if(isBroadcastAddress(&dstAddr, NULL, NULL)
&& (ether_src != NULL) && (ether_dst != NULL) /* PPP has no ethernet */
&& (memcmp(ether_dst, ethBroadcast, 6) != 0)) {
/* forceUsingIPaddress = 1; */
srcHost = lookupHost(NULL, ether_src, vlanId, 0, 0, actualDeviceId, h, p);
if(srcHost != NULL) {
if(vlanId != NO_VLAN) srcHost->vlanId = vlanId;
if(myGlobals.runningPref.enableSuspiciousPacketDump && (!hasWrongNetmask(srcHost))) {
/* Dump the first packet only */
char etherbuf[LEN_ETHERNET_ADDRESS_DISPLAY];
traceEvent(CONST_TRACE_WARNING, "Host %s has a wrong netmask",
etheraddr_string(ether_src, etherbuf));
dumpSuspiciousPacket(actualDeviceId, h, p);
}
setHostFlag(FLAG_HOST_WRONG_NETMASK, srcHost);
}
}
}
/*
IMPORTANT:
do NOT change the order of the lines below (see isBroadcastAddress call)
*/
dstHost = lookupHost(&dstAddr, ether_dst, vlanId, 1 , 0, actualDeviceId, h, p);
if(dstHost == NULL) {
/* Sanity check */
lowMemory();
return;
}
srcHost = lookupHost(&srcAddr, ether_src, vlanId,
/*
Don't check for multihoming when
the destination address is a broadcast address
*/
(!isBroadcastAddress(&dstAddr, NULL, NULL)),
forceUsingIPaddress, actualDeviceId, h, p);
if(srcHost == NULL) {
/* Sanity check */
lowMemory();
return; /* It might be that there's not enough memory that that
dstHost = lookupHost(&ip.ip_dst, ether_dst) caused
srcHost to be freed */
}
if(vlanId != NO_VLAN) { srcHost->vlanId = vlanId; dstHost->vlanId = vlanId; }
#ifdef DEBUG
if(myGlobals.runningPref.rFileName != NULL) {
static int numPkt=1;
traceEvent(CONST_TRACE_INFO, "%d) %s -> %s",
numPkt++,
srcHost->hostNumIpAddress,
dstHost->hostNumIpAddress);
fflush(stdout);
}
#endif
/* ****************** */
if(ip6) {
updateDevicePacketTTLStats(ip6->ip6_hlim, actualDeviceId);
if(ip6->ip6_hlim != 255) {
if((srcHost->minTTL == 0) || (ip6->ip6_hlim < srcHost->minTTL)) srcHost->minTTL = ip6->ip6_hlim;
if((ip6->ip6_hlim > srcHost->maxTTL)) srcHost->maxTTL = ip6->ip6_hlim;
}
} else {
updateDevicePacketTTLStats(ip.ip_ttl, actualDeviceId);
if(ip.ip_ttl != 255) {
/*
TTL can be calculated only when the packet
is originated by the sender
*/
if((srcHost->minTTL == 0) || (ip.ip_ttl < srcHost->minTTL)) srcHost->minTTL = ip.ip_ttl;
if((ip.ip_ttl > srcHost->maxTTL)) srcHost->maxTTL = ip.ip_ttl;
}
}
ctr.value = h->len;
updatePacketCount(srcHost, dstHost, ctr, 1, actualDeviceId);
if(!myGlobals.device[actualDeviceId].dummyDevice) {
checkNetworkRouter(srcHost, dstHost, ether_dst, actualDeviceId, length, h, p);
ctr.value = length;
}
if(ip6) {
incrementHostTrafficCounter(srcHost, ipv6BytesSent, length);
incrementHostTrafficCounter(dstHost, ipv6BytesRcvd, length);
} else {
incrementHostTrafficCounter(srcHost, ipv4BytesSent, length);
incrementHostTrafficCounter(dstHost, ipv4BytesRcvd, length);
}
if(subnetPseudoLocalHost(srcHost)) {
if(subnetPseudoLocalHost(dstHost)) {
incrementHostTrafficCounter(srcHost, bytesSentLoc, length);
incrementHostTrafficCounter(dstHost, bytesRcvdLoc, length);
} else {
incrementHostTrafficCounter(srcHost, bytesSentRem, length);
incrementHostTrafficCounter(dstHost, bytesRcvdLoc, length);
}
} else {
/* srcHost is remote */
if(subnetPseudoLocalHost(dstHost)) {
incrementHostTrafficCounter(srcHost, bytesSentLoc, length);
incrementHostTrafficCounter(dstHost, bytesRcvdFromRem, length);
} else {
incrementHostTrafficCounter(srcHost, bytesSentRem, length);
incrementHostTrafficCounter(dstHost, bytesRcvdFromRem, length);
}
}
if(ip6) {
if(ip6->ip6_nxt == IPPROTO_FRAGMENT) {
fragmented = 1;
nh = ip6->ip6_nxt;
}
} else {
off = ntohs(ip.ip_off);
if(off & 0x3fff) {
fragmented = 1;
nh = ip.ip_p;
}
}
/*
This is a fragment: fragment handling is handled by handleFragment()
called below.
Courtesy of Andreas Pfaller
*/
if(fragmented) {
incrementTrafficCounter(&myGlobals.device[actualDeviceId].fragmentedIpBytes, length);
switch(nh) {
case IPPROTO_TCP:
incrementHostTrafficCounter(srcHost, tcpFragmentsSent, length);
incrementHostTrafficCounter(dstHost, tcpFragmentsRcvd, length);
break;
case IPPROTO_UDP:
incrementHostTrafficCounter(srcHost, udpFragmentsSent, length);
incrementHostTrafficCounter(dstHost, udpFragmentsRcvd, length);
break;
case IPPROTO_ICMP:
incrementHostTrafficCounter(srcHost, icmpFragmentsSent, length);
incrementHostTrafficCounter(dstHost, icmpFragmentsRcvd, length);
break;
case IPPROTO_GRE:
incrementHostTrafficCounter(srcHost, greSent, length);
incrementHostTrafficCounter(dstHost, greRcvd, length);
incrementTrafficCounter(&myGlobals.device[actualDeviceId].greBytes, length);
break;
case IPPROTO_IPSEC_ESP:
case IPPROTO_IPSEC_AH:
incrementHostTrafficCounter(srcHost, ipsecSent, length);
incrementHostTrafficCounter(dstHost, ipsecRcvd, length);
incrementTrafficCounter(&myGlobals.device[actualDeviceId].ipsecBytes, length);
break;
case IPPROTO_ICMPV6:
incrementHostTrafficCounter(srcHost, icmp6FragmentsSent, length);
incrementHostTrafficCounter(dstHost, icmp6FragmentsRcvd, length);
break;
}
}
if(ip6) {
advance = sizeof(struct ip6_hdr);
cp = (unsigned char *) ip6;
snapend = (unsigned char *)(bp+length);
nh = ip6->ip6_nxt;
ip_len = ntohs(ip6->ip6_plen);
tcpUdpLen = ip_len;
} else {
nh = ip.ip_p;
ip_len = ntohs(ip.ip_len);
tcpUdpLen = ip_len - hlen;
}
loop:
if(ip6)
cp +=advance;
switch(nh) {
case IPPROTO_FRAGMENT:
if(ip6) {
advance = sizeof(struct ip6_frag);
if(snapend <= cp+advance) goto end;
nh = *cp;
goto loop;
}
/* If it's no IPv6 we continue */
case IPPROTO_TCP:
incrementTrafficCounter(&myGlobals.device[actualDeviceId].tcpBytes, length);
if(tcpUdpLen < sizeof(struct tcphdr)) {
if(myGlobals.runningPref.enableSuspiciousPacketDump) {
traceEvent(CONST_TRACE_WARNING, "Malformed TCP pkt %s->%s detected (packet too short)",
srcHost->hostResolvedName,
dstHost->hostResolvedName);
dumpSuspiciousPacket(actualDeviceId, h, p);
allocateSecurityHostPkts(srcHost); allocateSecurityHostPkts(dstHost);
incrementUsageCounter(&srcHost->secHostPkts->malformedPktsSent, dstHost, actualDeviceId);
incrementUsageCounter(&dstHost->secHostPkts->malformedPktsRcvd, srcHost, actualDeviceId);
incrementTrafficCounter(&myGlobals.device[actualDeviceId].securityPkts.malformedPkts, 1);
}
} else {
memcpy(&tp, bp+hlen, sizeof(struct tcphdr));
/* Sanity check */
if(tcpUdpLen >= (tp.th_off * 4)) {
int diff;
/* Real lenght if we captured the full packet */
tcpDataLength = tcpUdpLen - (tp.th_off * 4);
/* Actual lenght scaled with caplen */
diff = h->caplen - (h->len - tcpDataLength);
if(diff > 0) {
tcpDataLength = diff;
theData = (u_char*)(bp+hlen+(tp.th_off * 4));
} else {
tcpDataLength = 0;
theData = NULL;
}
} else {
tcpDataLength = 0;
theData = NULL;
}
sport = ntohs(tp.th_sport);
dport = ntohs(tp.th_dport);
/*
Don't move this code on top as it is supposed to stay here
as it modifies sport/sport
Courtesy of Andreas Pfaller
*/
if(myGlobals.enableFragmentHandling && (fragmented)) {
/* Handle fragmented packets */
if(ip6)
length = handleFragment(srcHost, dstHost, &sport, &dport,
(u_short)(ip6->ip6_flow & 0xffff),fragmented,
length,ntohs(ip6->ip6_plen),
actualDeviceId, h, p);
else
length = handleFragment(srcHost, dstHost, &sport, &dport,
ntohs(ip.ip_id), off, length,
ip_len - hlen, actualDeviceId, h, p);
}
if(srcHost->fingerprint == NULL) {
char fingerprint[64] = { 0 } ;
int WIN=0, MSS=-1, WS=-1, S=0, N=0, D=0, T=0;
int ttl;
char WSS[3] = { 0 }, _MSS[5] = { 0 };
struct tcphdr *tcp = (struct tcphdr*)(bp+hlen);
u_char *tcp_opt = (u_char *)(bp + hlen + 1);
u_char *tcp_data = (u_char *)(bp + hlen + tp.th_off * 4);
if(tcp->th_flags & TH_SYN) { /* only SYN or SYN-2ACK packets */
if(tcpUdpLen > 0) {
if(ip6) {
if(!fragmented) D = 1;
} else
if(ntohs(ip.ip_off) & IP_DF) D = 1; /* don't fragment bit is set */
WIN = ntohs(tcp->th_win); /* TCP window size */
if(tcp_data != tcp_opt) { /* there are some tcp_option to be parsed */
u_char *opt_start = tcp_opt, *opt_end = tcp_data;
u_short num_loops = 0;
while(opt_start < opt_end) {
switch(opt_start[0]) {
case TCPOPT_EOL: /* end option: exit */
opt_start = opt_end;
break;
case TCPOPT_NOP:
N = 1;
opt_start++;
break;
case TCPOPT_SACKOK:
S = 1;
opt_start += 2;
break;
case TCPOPT_MAXSEG:
opt_start += 2;
MSS = ntohs(ptohs(opt_start));
opt_start += 2;
break;
case TCPOPT_WSCALE:
opt_start += 2;
WS = *opt_start;
opt_start++;
break;
case TCPOPT_TIMESTAMP:
T = 1;
opt_start++;
opt_start += (*opt_start - 1);
break;
default:
opt_start++;
if(*opt_start > 0)
opt_start += (*opt_start - 1);
break;
}
num_loops++;
if(num_loops > 16) {
/* Suspicious packet: maybe the TCP options are wrong */
break;
}
}
}
if(WS == -1)
safe_snprintf(__FILE__, __LINE__, WSS, sizeof(WSS), "WS");
else
safe_snprintf(__FILE__, __LINE__, WSS, sizeof(WSS), "%02X", WS & 0xFFFF);
if(MSS == -1)
safe_snprintf(__FILE__, __LINE__, _MSS, sizeof(_MSS), "_MSS");
else
safe_snprintf(__FILE__, __LINE__, _MSS, sizeof(_MSS), "%04X", MSS & 0xFFFFFFFF);
safe_snprintf(__FILE__, __LINE__, fingerprint, sizeof(fingerprint),
"%04X:%s:%02X:%s:%d:%d:%d:%d:%c:%02X",
WIN, _MSS, ttl = TTL_PREDICTOR(ip.ip_ttl), WSS , S, N, D, T,
(tcp->th_flags & TH_ACK) ? 'A' : 'S', tcpUdpLen);
#if 0
traceEvent(CONST_TRACE_INFO, "[%s][%s]", srcHost->hostNumIpAddress, fingerprint);
#endif
srcHost->fingerprint = strdup(fingerprint);
}
}
}
if((sport > 0) || (dport > 0)) {
/* It might be that tcpDataLength is 0 when
the rcvd packet is fragmented and the main
packet has not yet been rcvd */
updateInterfacePorts(actualDeviceId, sport, dport, length);
if(tcpDataLength > 0) /* Don't update ports for all packets */
updateUsedPorts(srcHost, dstHost, sport, dport, tcpDataLength);
if(subnetPseudoLocalHost(srcHost)) {
if(subnetPseudoLocalHost(dstHost)) {
incrementHostTrafficCounter(srcHost, tcpSentLoc, length);
incrementHostTrafficCounter(dstHost, tcpRcvdLoc, length);
incrementTrafficCounter(&myGlobals.device[actualDeviceId].tcpGlobalTrafficStats.local,
length);
} else {
incrementHostTrafficCounter(srcHost, tcpSentRem, length);
incrementHostTrafficCounter(dstHost, tcpRcvdLoc, length);
incrementTrafficCounter(&myGlobals.device[actualDeviceId].tcpGlobalTrafficStats.local2remote,
length);
}
} else {
/* srcHost is remote */
if(subnetPseudoLocalHost(dstHost)) {
incrementHostTrafficCounter(srcHost, tcpSentLoc, length);
incrementHostTrafficCounter(dstHost, tcpRcvdFromRem, length);
incrementTrafficCounter(&myGlobals.device[actualDeviceId].tcpGlobalTrafficStats.remote2local,
length);
} else {
incrementHostTrafficCounter(srcHost, tcpSentRem, length);
incrementHostTrafficCounter(dstHost, tcpRcvdFromRem, length);
incrementTrafficCounter(&myGlobals.device[actualDeviceId].tcpGlobalTrafficStats.remote,
length);
nonFullyRemoteSession = 0;
}
}
if(nonFullyRemoteSession) {
if(ip6)
handleSession(h, p, nh, fragmented, tp.th_win,
srcHost, sport, dstHost,
dport, ntohs(ip6->ip6_plen), 0,
ip_offset, &tp, tcpDataLength,
theData, actualDeviceId, &newSession,
IPOQUE_PROTOCOL_UNKNOWN, 1);
else
handleSession(h, p, nh, (off & 0x3fff), tp.th_win,
srcHost, sport, dstHost,
dport, ip_len, 0,
ip_offset, &tp, tcpDataLength,
theData, actualDeviceId, &newSession,
IPOQUE_PROTOCOL_UNKNOWN, 1);
}
}
}
if(ip6)
goto end;
else
break;
case IPPROTO_UDP:
incrementTrafficCounter(&myGlobals.device[actualDeviceId].udpBytes, length);
incrementTrafficCounter(&myGlobals.device[actualDeviceId].udpGlobalTrafficStats.totalFlows, 1);
if(tcpUdpLen < sizeof(struct udphdr)) {
if(myGlobals.runningPref.enableSuspiciousPacketDump) {
traceEvent(CONST_TRACE_WARNING, "Malformed UDP pkt %s->%s detected (packet too short)",
srcHost->hostResolvedName,
dstHost->hostResolvedName);
dumpSuspiciousPacket(actualDeviceId, h, p);
allocateSecurityHostPkts(srcHost); allocateSecurityHostPkts(dstHost);
incrementUsageCounter(&srcHost->secHostPkts->malformedPktsSent, dstHost, actualDeviceId);
incrementUsageCounter(&dstHost->secHostPkts->malformedPktsRcvd, srcHost, actualDeviceId);
incrementTrafficCounter(&myGlobals.device[actualDeviceId].securityPkts.malformedPkts, 1);
}
} else {
udpDataLength = (u_int)(tcpUdpLen - sizeof(struct udphdr));
memcpy(&up, bp+hlen, sizeof(struct udphdr));
sport = ntohs(up.uh_sport);
dport = ntohs(up.uh_dport);
if(!(fragmented)) {
/* Not fragmented */
if(((sport == 53) || (dport == 53) /* domain */)
|| ((sport == 5353) && (dport == 5353)) /* Multicast DNS */) {
short isRequest = 0, positiveReply = 0;
u_int16_t transactionId = 0;
if(myGlobals.runningPref.enablePacketDecoding
&& (bp != NULL) /* packet long enough */) {
/* The DNS chain will be checked here */
transactionId = processDNSPacket(srcHost, sport, bp+hlen+sizeof(struct udphdr),
udpDataLength, &isRequest, &positiveReply);
#ifdef DNS_SNIFF_DEBUG
traceEvent(CONST_TRACE_INFO, "DNS_SNIFF_DEBUG: %s:%d->%s:%d [request: %d][positive reply: %d]",
srcHost->hostResolvedName, sport,
dstHost->hostResolvedName, dport,
isRequest, positiveReply);
#endif
allocHostTrafficCounterMemory(srcHost, protocolInfo, sizeof(ProtocolInfo));
allocHostTrafficCounterMemory(dstHost, protocolInfo, sizeof(ProtocolInfo));
if((srcHost->protocolInfo == NULL) || (dstHost->protocolInfo == NULL)) return;
allocHostTrafficCounterMemory(srcHost, protocolInfo->dnsStats, sizeof(ServiceStats));
if(srcHost->protocolInfo->dnsStats == NULL) return;
allocHostTrafficCounterMemory(dstHost, protocolInfo->dnsStats, sizeof(ServiceStats));
if(dstHost->protocolInfo->dnsStats == NULL) return;
allocHostTrafficCounterMemory(srcHost, protocolInfo, sizeof(ProtocolInfo));
allocHostTrafficCounterMemory(srcHost, protocolInfo->dnsStats, sizeof(ServiceStats));
allocHostTrafficCounterMemory(dstHost, protocolInfo, sizeof(ProtocolInfo));
allocHostTrafficCounterMemory(dstHost, protocolInfo->dnsStats, sizeof(ServiceStats));
if(isRequest) {
/* to be 64bit-proof we have to copy the elements */
tvstrct.tv_sec = h->ts.tv_sec;
tvstrct.tv_usec = h->ts.tv_usec;
addTimeMapping(transactionId, tvstrct);
if(subnetLocalHost(dstHost)) {
incrementHostTrafficCounter(srcHost, protocolInfo->dnsStats->numLocalReqSent, 1);
} else {
incrementHostTrafficCounter(srcHost, protocolInfo->dnsStats->numRemReqSent, 1);
}
if(subnetLocalHost(srcHost)) {
incrementHostTrafficCounter(dstHost, protocolInfo->dnsStats->numLocalReqRcvd, 1);
} else {
incrementHostTrafficCounter(dstHost, protocolInfo->dnsStats->numRemReqRcvd, 1);
}
} else {
time_t microSecTimeDiff;
/* to be 64bit-safe we have to copy the elements */
tvstrct.tv_sec = h->ts.tv_sec;
tvstrct.tv_usec = h->ts.tv_usec;
microSecTimeDiff = getTimeMapping(transactionId, tvstrct);
if(microSecTimeDiff > 0) {
#ifdef DEBUG
traceEvent(CONST_TRACE_INFO, "TransactionId=0x%X [%.1f ms]",
transactionId, ((float)microSecTimeDiff)/1000);
#endif
if(microSecTimeDiff > 0) {
if(subnetLocalHost(dstHost)) {
if((srcHost->protocolInfo->dnsStats->fastestMicrosecLocalReqServed == 0)
|| (microSecTimeDiff < srcHost->protocolInfo->dnsStats->fastestMicrosecLocalReqServed))
srcHost->protocolInfo->dnsStats->fastestMicrosecLocalReqServed = microSecTimeDiff;
if(microSecTimeDiff > srcHost->protocolInfo->dnsStats->slowestMicrosecLocalReqServed)
srcHost->protocolInfo->dnsStats->slowestMicrosecLocalReqServed = microSecTimeDiff;
} else {
if((srcHost->protocolInfo->dnsStats->fastestMicrosecRemReqServed == 0)
|| (microSecTimeDiff < srcHost->protocolInfo->dnsStats->fastestMicrosecRemReqServed))
srcHost->protocolInfo->dnsStats->fastestMicrosecRemReqServed = microSecTimeDiff;
if(microSecTimeDiff > srcHost->protocolInfo->dnsStats->slowestMicrosecRemReqServed)
srcHost->protocolInfo->dnsStats->slowestMicrosecRemReqServed = microSecTimeDiff;