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/*
* Copyright (C) 1998-2007 Luca Deri <deri@ntop.org>
*
* http://www.ntop.org/
*
* 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.
*/
/*
* Copyright (c) 1994, 1996
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include "ntop.h"
/* ************************************************ */
void handleBootp(HostTraffic *srcHost,
HostTraffic *dstHost,
u_short sport,
u_short dport,
u_int packetDataLength,
u_char* packetData,
int actualDeviceId) {
BootProtocol bootProto;
u_int len;
int rc;
char savechar; /* Courtesy of
Axel Thimm <Axel.Thimm+ntop@physik.fu-berlin.de>
*/
if((!myGlobals.runningPref.enablePacketDecoding)
|| (packetData == NULL) /* packet too short ? */
|| (myGlobals.runningPref.dontTrustMACaddr))
return;
memset(&bootProto, 0, sizeof(BootProtocol));
switch(sport) {
case 67: /* BOOTP/DHCP: server -> client*/
FD_SET(FLAG_HOST_TYPE_SVC_DHCP_SERVER, &srcHost->flags);
#ifdef DHCP_DEBUG
traceEvent(CONST_TRACE_INFO, "%s:%d->%s:%d",
srcHost->hostNumIpAddress, sport,
dstHost->hostNumIpAddress, dport);
#endif
if(packetData != NULL) {
char buf[32];
/*
This is a server BOOTP/DHCP response
that could be decoded. Let's try.
For more info see http://www.dhcp.org/
*/
if(packetDataLength >= sizeof(BootProtocol))
len = sizeof(BootProtocol);
else
len = packetDataLength;
memcpy(&bootProto, packetData, len);
if(bootProto.bp_op == 2) {
/* BOOTREPLY */
u_long dummyMac;
memcpy(&dummyMac, bootProto.bp_chaddr, sizeof(u_long));
if((bootProto.bp_yiaddr.s_addr != 0)
&& (dummyMac != 0) /* MAC address <> 00:00:00:..:00 */
) {
#ifdef DHCP_DEBUG
char etherbuf[LEN_ETHERNET_ADDRESS_DISPLAY];
#endif
NTOHL(bootProto.bp_yiaddr.s_addr);
#ifdef DHCP_DEBUG
traceEvent(CONST_TRACE_INFO, "%s@%s",
intoa(bootProto.bp_yiaddr),
etheraddr_string(bootProto.bp_chaddr, etherbuf));
#endif
/* Let's check whether this is a DHCP packet [DHCP magic cookie] */
if((bootProto.bp_vend[0] == 0x63) && (bootProto.bp_vend[1] == 0x82)
&& (bootProto.bp_vend[2] == 0x53) && (bootProto.bp_vend[3] == 0x63)) {
/*
RFC 1048 specifies a magic cookie
{ 0x63 0x82 0x53 0x63 }
for recognising DHCP packets encapsulated
in BOOTP packets.
*/
u_int idx = 4;
struct in_addr hostIpAddress;
HostTraffic *trafficHost, *realDstHost;
/*
This is the real address of the recipient because
dstHost is a broadcast address
*/
realDstHost = findHostByMAC((char*)bootProto.bp_chaddr, dstHost->vlanId, actualDeviceId);
if(realDstHost == NULL) {
realDstHost = lookupHost(/* &bootProto.bp_yiaddr */ NULL, bootProto.bp_chaddr,
srcHost->vlanId, 0, 0, actualDeviceId);
} else {
#ifdef DHCP_DEBUG
traceEvent(CONST_TRACE_INFO, "<<=>> %s (%d)",
realDstHost->hostResolvedName,
broadcastHost(realDstHost));
#endif
}
if(realDstHost != NULL) {
if(realDstHost->protocolInfo == NULL) realDstHost->protocolInfo = calloc(1, sizeof(ProtocolInfo));
if(realDstHost->protocolInfo->dhcpStats == NULL) {
realDstHost->protocolInfo->dhcpStats = (DHCPStats*)malloc(sizeof(DHCPStats));
memset(realDstHost->protocolInfo->dhcpStats, 0, sizeof(DHCPStats));
}
if(srcHost->protocolInfo == NULL) srcHost->protocolInfo = calloc(1, sizeof(ProtocolInfo));
if(srcHost->protocolInfo->dhcpStats == NULL) {
srcHost->protocolInfo->dhcpStats = (DHCPStats*)malloc(sizeof(DHCPStats));
memset(srcHost->protocolInfo->dhcpStats, 0, sizeof(DHCPStats));
}
FD_SET(FLAG_HOST_TYPE_SVC_DHCP_CLIENT, &realDstHost->flags);
realDstHost->protocolInfo->dhcpStats->assignTime = myGlobals.actTime;
realDstHost->protocolInfo->dhcpStats->dhcpServerIpAddress.s_addr = srcHost->hostIp4Address.s_addr;
realDstHost->protocolInfo->dhcpStats->dhcpServerIpAddress.s_addr = srcHost->hostIp4Address.s_addr;
if(realDstHost->hostIp4Address.s_addr != bootProto.bp_yiaddr.s_addr) {
/* The host address has changed */
#ifdef DHCP_DEBUG
traceEvent(CONST_TRACE_INFO, "DHCP host address changed: %s->%s",
intoa(realDstHost->hostIp4Address),
_intoa(bootProto.bp_yiaddr, buf, sizeof(buf)));
#endif
realDstHost->protocolInfo->dhcpStats->previousIpAddress.s_addr = realDstHost->hostIp4Address.s_addr;
realDstHost->hostIp4Address.s_addr = bootProto.bp_yiaddr.s_addr;
strncpy(realDstHost->hostNumIpAddress,
_intoa(realDstHost->hostIp4Address, buf, sizeof(buf)),
sizeof(realDstHost->hostNumIpAddress));
if(myGlobals.runningPref.numericFlag == 0) {
realDstHost->hostIpAddress.hostFamily = AF_INET;
ipaddr2str(realDstHost->hostIpAddress, 1);
}
if (realDstHost->dnsDomainValue != NULL) free(realDstHost->dnsDomainValue);
realDstHost->dnsDomainValue = NULL;
if (realDstHost->dnsTLDValue != NULL) free(realDstHost->dnsTLDValue);
realDstHost->dnsTLDValue = NULL;
if (realDstHost->ip2ccValue != NULL) free(realDstHost->ip2ccValue);
realDstHost->ip2ccValue = NULL;
if(isBroadcastAddress(&realDstHost->hostIpAddress, NULL, NULL))
FD_SET(FLAG_BROADCAST_HOST, &realDstHost->flags);
else
FD_CLR(FLAG_BROADCAST_HOST, &realDstHost->flags);
}
while(idx < 64 /* Length of the BOOTP vendor-specific area */) {
u_char optionId = bootProto.bp_vend[idx++];
u_long tmpUlong;
HostAddr addr;
addr.hostFamily = AF_INET;
if(optionId == 255) break; /* End of options */
switch(optionId) { /* RFC 2132 */
case 1: /* Netmask */
len = bootProto.bp_vend[idx++];
memcpy(&hostIpAddress.s_addr, &bootProto.bp_vend[idx], sizeof(hostIpAddress.s_addr));
NTOHL(hostIpAddress.s_addr);
#ifdef DHCP_DEBUG
traceEvent(CONST_TRACE_INFO, "Netmask: %s", intoa(hostIpAddress));
#endif
idx += len;
break;
case 3: /* Gateway */
len = bootProto.bp_vend[idx++];
memcpy(&hostIpAddress.s_addr, &bootProto.bp_vend[idx], sizeof(hostIpAddress.s_addr));
NTOHL(hostIpAddress.s_addr);
#ifdef DHCP_DEBUG
traceEvent(CONST_TRACE_INFO, "Gateway: %s", _intoa(hostIpAddress, buf, sizeof(buf)));
#endif
/* *************** */
addr.Ip4Address.s_addr = hostIpAddress.s_addr;
trafficHost = findHostByNumIP(addr, srcHost->vlanId, actualDeviceId);
if(trafficHost != NULL) {
incrementUsageCounter(&realDstHost->contactedRouters, trafficHost, actualDeviceId);
FD_SET(FLAG_GATEWAY_HOST, &trafficHost->flags);
}
/* *************** */
idx += len;
break;
case 12: /* Host name */
len = bootProto.bp_vend[idx++];
#ifdef DHCP_DEBUG
savechar = bootProto.bp_vend[idx+len];
bootProto.bp_vend[idx+len] = '\0';
traceEvent(CONST_TRACE_INFO, "Host name: %s", &bootProto.bp_vend[idx]);
bootProto.bp_vend[idx+len] = savechar;
#endif
idx += len;
break;
case 15: /* Domain name */
len = bootProto.bp_vend[idx++];
savechar = bootProto.bp_vend[idx+len];
bootProto.bp_vend[idx+len] = '\0';
#ifdef DHCP_DEBUG
traceEvent(CONST_TRACE_INFO, "Domain name: %s", &bootProto.bp_vend[idx]);
#endif
if(strcmp(realDstHost->hostResolvedName, realDstHost->hostNumIpAddress)) {
char tmpName[2*MAX_LEN_SYM_HOST_NAME],
tmpHostName[MAX_LEN_SYM_HOST_NAME],
tmpDomainName[MAX_LEN_SYM_HOST_NAME];
int hostLen, i;
memset(tmpHostName, 0, sizeof(tmpHostName));
strncpy(tmpHostName, realDstHost->hostResolvedName, MAX_LEN_SYM_HOST_NAME-1);
for(i=0; i<strlen(tmpHostName); i++)
if(tmpHostName[i] == '.')
break;
tmpHostName[i] = '\0';
/* Fix courtesy of Christoph Zens <chris@topfen.homeip.net> */
strncpy(tmpDomainName, (char*)&bootProto.bp_vend[idx], len);
tmpDomainName[len] = '\0';
if(strcmp(tmpHostName, tmpDomainName) != 0) {
rc = safe_snprintf(__FILE__, __LINE__, tmpName, sizeof(tmpName), "%s.%s",
tmpHostName, tmpDomainName);
if (rc >= 0) {
hostLen = len;
len = strlen(tmpName);
if(len >= (MAX_LEN_SYM_HOST_NAME-1)) {
tmpName[MAX_LEN_SYM_HOST_NAME-2] = '\0';
len--;
}
/* Fix courtesy of Christoph Zens <chris@topfen.homeip.net> */
if(len >= MAX_LEN_SYM_HOST_NAME) len = MAX_LEN_SYM_HOST_NAME-1;
tmpName[len] = '\0';
for(i=0; i<strlen(tmpName); i++) {
if(isupper(tmpName[i]))
tmpName[i] = tolower(tmpName[i]);
}
setResolvedName(realDstHost, tmpName, FLAG_HOST_SYM_ADDR_TYPE_NAME);
fillDomainName(realDstHost);
}
}
}
bootProto.bp_vend[idx+len] = savechar;
idx += len;
break;
case 19: /* IP Forwarding */
len = bootProto.bp_vend[idx++];
#ifdef DHCP_DEBUG
traceEvent(CONST_TRACE_INFO, "IP Forwarding: %s", bootProto.bp_vend[idx]);
#endif
idx += len;
break;
case 28: /* Broadcast Address */
len = bootProto.bp_vend[idx++];
memcpy(&hostIpAddress.s_addr, &bootProto.bp_vend[idx], sizeof(hostIpAddress.s_addr));
NTOHL(hostIpAddress.s_addr);
#ifdef DHCP_DEBUG
traceEvent(CONST_TRACE_INFO, "Broadcast Address: %s",
intoa(hostIpAddress));
#endif
idx += len;
break;
case 44: /* WINS server */
len = bootProto.bp_vend[idx++];
memcpy(&hostIpAddress.s_addr, &bootProto.bp_vend[idx], sizeof(hostIpAddress.s_addr));
NTOHL(hostIpAddress.s_addr);
#ifdef DHCP_DEBUG
traceEvent(CONST_TRACE_INFO, "WINS server: %s",
intoa(hostIpAddress));
#endif
idx += len;
/* *************** */
addr.Ip4Address.s_addr = hostIpAddress.s_addr;
trafficHost = findHostByNumIP(addr, srcHost->vlanId, actualDeviceId);
if(trafficHost != NULL) {
FD_SET(FLAG_HOST_TYPE_SVC_WINS, &trafficHost->flags);
}
/* *************** */
break;
case 51: /* Lease time */
len = bootProto.bp_vend[idx++];
if(len == 4) {
memcpy(&tmpUlong, &bootProto.bp_vend[idx], sizeof(hostIpAddress.s_addr));
NTOHL(tmpUlong);
#ifdef DHCP_DEBUG
traceEvent(CONST_TRACE_INFO, "Lease time: %u", tmpUlong);
#endif
realDstHost->protocolInfo->dhcpStats->leaseTime = myGlobals.actTime+tmpUlong;
}
idx += len;
break;
case 53: /* DHCP Message Type */
len = bootProto.bp_vend[idx++];
#ifdef DHCP_DEBUG
traceEvent(CONST_TRACE_INFO, "DHCP Message Type: %d", bootProto.bp_vend[idx]);
#endif
switch((int)bootProto.bp_vend[idx]) {
case FLAG_DHCP_DISCOVER_MSG:
incrementTrafficCounter(&realDstHost->protocolInfo->dhcpStats->dhcpMsgRcvd[FLAG_DHCP_DISCOVER_MSG], 1);
incrementTrafficCounter(&srcHost->protocolInfo->dhcpStats->dhcpMsgSent[FLAG_DHCP_DISCOVER_MSG], 1);
break;
case FLAG_DHCP_OFFER_MSG:
incrementTrafficCounter(&realDstHost->protocolInfo->dhcpStats->dhcpMsgRcvd[FLAG_DHCP_OFFER_MSG], 1);
incrementTrafficCounter(&srcHost->protocolInfo->dhcpStats->dhcpMsgSent[FLAG_DHCP_OFFER_MSG], 1);
break;
case FLAG_DHCP_REQUEST_MSG:
incrementTrafficCounter(&realDstHost->protocolInfo->dhcpStats->dhcpMsgRcvd[FLAG_DHCP_REQUEST_MSG], 1);
incrementTrafficCounter(&srcHost->protocolInfo->dhcpStats->dhcpMsgSent[FLAG_DHCP_REQUEST_MSG], 1);
break;
case FLAG_DHCP_DECLINE_MSG:
incrementTrafficCounter(&realDstHost->protocolInfo->dhcpStats->dhcpMsgRcvd[FLAG_DHCP_DECLINE_MSG], 1);
incrementTrafficCounter(&srcHost->protocolInfo->dhcpStats->dhcpMsgSent[FLAG_DHCP_DECLINE_MSG], 1);
break;
case FLAG_DHCP_ACK_MSG:
incrementTrafficCounter(&realDstHost->protocolInfo->dhcpStats->dhcpMsgRcvd[FLAG_DHCP_ACK_MSG], 1);
incrementTrafficCounter(&srcHost->protocolInfo->dhcpStats->dhcpMsgSent[FLAG_DHCP_ACK_MSG], 1);
break;
case FLAG_DHCP_NACK_MSG:
incrementTrafficCounter(&realDstHost->protocolInfo->dhcpStats->dhcpMsgRcvd[FLAG_DHCP_NACK_MSG], 1);
incrementTrafficCounter(&srcHost->protocolInfo->dhcpStats->dhcpMsgSent[FLAG_DHCP_NACK_MSG], 1);
break;
case FLAG_DHCP_RELEASE_MSG:
incrementTrafficCounter(&realDstHost->protocolInfo->dhcpStats->dhcpMsgRcvd[FLAG_DHCP_RELEASE_MSG], 1);
incrementTrafficCounter(&srcHost->protocolInfo->dhcpStats->dhcpMsgSent[FLAG_DHCP_RELEASE_MSG], 1);
break;
case FLAG_DHCP_INFORM_MSG:
incrementTrafficCounter(&realDstHost->protocolInfo->dhcpStats->dhcpMsgRcvd[FLAG_DHCP_INFORM_MSG], 1);
incrementTrafficCounter(&srcHost->protocolInfo->dhcpStats->dhcpMsgSent[FLAG_DHCP_INFORM_MSG], 1);
break;
case FLAG_DHCP_UNKNOWN_MSG:
default:
incrementTrafficCounter(&realDstHost->protocolInfo->dhcpStats->dhcpMsgRcvd[FLAG_DHCP_UNKNOWN_MSG], 1);
incrementTrafficCounter(&srcHost->protocolInfo->dhcpStats->dhcpMsgSent[FLAG_DHCP_UNKNOWN_MSG], 1);
break;
}
idx += len;
break;
case 58: /* Renewal time */
len = bootProto.bp_vend[idx++];
if(len == 4) {
memcpy(&tmpUlong, &bootProto.bp_vend[idx], sizeof(hostIpAddress.s_addr));
NTOHL(tmpUlong);
#ifdef FLAG_DHCP_DEBUG
traceEvent(CONST_TRACE_INFO, "Renewal time: %u", tmpUlong);
#endif
realDstHost->protocolInfo->dhcpStats->renewalTime = myGlobals.actTime+tmpUlong;
}
idx += len;
break;
case 59: /* Rebinding time */
len = bootProto.bp_vend[idx++];
if(len == 4) {
memcpy(&tmpUlong, &bootProto.bp_vend[idx], sizeof(hostIpAddress.s_addr));
NTOHL(tmpUlong);
#ifdef FLAG_DHCP_DEBUG
traceEvent(CONST_TRACE_INFO, "Rebinding time: %u", tmpUlong);
#endif
}
idx += len;
break;
case 64: /* NIS+ Domain */
len = bootProto.bp_vend[idx++];
memcpy(&hostIpAddress.s_addr, &bootProto.bp_vend[idx], sizeof(hostIpAddress.s_addr));
NTOHL(hostIpAddress.s_addr);
#ifdef FLAG_DHCP_DEBUG
traceEvent(CONST_TRACE_INFO, "NIS+ domain: %s", intoa(hostIpAddress));
#endif
idx += len;
break;
default:
#ifdef DEBUG
traceEvent(CONST_TRACE_INFO, "Unknown DHCP option '%d'", (int)optionId);
#endif
len = bootProto.bp_vend[idx++];
idx += len;
break;
}
}
} /* realDstHost != NULL */
}
}
}
}
break;
case 68: /* BOOTP/DHCP: client -> server */
if(packetData != NULL) {
/*
This is a server BOOTP/DHCP response
that could be decoded. Let's try.
For more info see http://www.dhcp.org/
*/
FD_SET(FLAG_HOST_TYPE_SVC_DHCP_CLIENT, &srcHost->flags);
FD_SET(FLAG_HOST_TYPE_SVC_DHCP_SERVER, &dstHost->flags);
if(packetDataLength >= sizeof(BootProtocol))
len = sizeof(BootProtocol);
else
len = packetDataLength;
memcpy(&bootProto, packetData, len);
if(bootProto.bp_op == 1) {
/* BOOTREQUEST */
u_long dummyMac;
memcpy(&dummyMac, bootProto.bp_chaddr, sizeof(u_long));
if((dummyMac != 0) /* MAC address <> 00:00:00:..:00 */) {
#ifdef FLAG_DHCP_DEBUG
char etherbuf[LEN_ETHERNET_ADDRESS_DISPLAY];
#endif
NTOHL(bootProto.bp_yiaddr.s_addr);
#ifdef FLAG_DHCP_DEBUG
traceEvent(CONST_TRACE_INFO, "%s", etheraddr_string(bootProto.bp_chaddr, etherbuf));
#endif
/* Let's check whether this is a DHCP packet [DHCP magic cookie] */
if((bootProto.bp_vend[0] == 0x63) && (bootProto.bp_vend[1] == 0x82)
&& (bootProto.bp_vend[2] == 0x53) && (bootProto.bp_vend[3] == 0x63)) {
/*
RFC 1048 specifies a magic cookie
{ 0x63 0x82 0x53 0x63 }
for recognising DHCP packets encapsulated
in BOOTP packets.
*/
int idx = 4;
HostTraffic *realClientHost;
/*
This is the real address of the recipient because
dstHost is a broadcast address
*/
realClientHost = findHostByMAC((char*)bootProto.bp_chaddr, srcHost->vlanId, actualDeviceId);
if(realClientHost == NULL) {
realClientHost = lookupHost(/*&bootProto.bp_yiaddr*/ NULL, bootProto.bp_chaddr,
srcHost->vlanId, 0, 0, actualDeviceId);
} else {
#ifdef FLAG_DHCP_DEBUG
traceEvent(CONST_TRACE_INFO, "<<=>> %s (%d)",
realClientHost->hostResolvedName,
broadcastHost(realClientHost));
#endif
}
if(realClientHost != NULL) {
if(realClientHost->protocolInfo == NULL) realClientHost->protocolInfo = calloc(1, sizeof(ProtocolInfo));
if(realClientHost->protocolInfo->dhcpStats == NULL) {
realClientHost->protocolInfo->dhcpStats = (DHCPStats*)malloc(sizeof(DHCPStats));
memset(realClientHost->protocolInfo->dhcpStats, 0, sizeof(DHCPStats));
}
while(idx < 64 /* Length of the BOOTP vendor-specific area */) {
u_char optionId = bootProto.bp_vend[idx++];
if(optionId == 255) break; /* End of options */
switch(optionId) { /* RFC 2132 */
case 12: /* Host name */
len = bootProto.bp_vend[idx++];
savechar = bootProto.bp_vend[idx+len];
bootProto.bp_vend[idx+len] = '\0';
#ifdef FLAG_DHCP_DEBUG
traceEvent(CONST_TRACE_INFO, "Host name: %s", &bootProto.bp_vend[idx]);
#endif
/* Fix courtesy of Christoph Zens <chris@topfen.homeip.net> */
if(len >= (MAX_LEN_SYM_HOST_NAME-1)) {
bootProto.bp_vend[idx+MAX_LEN_SYM_HOST_NAME-2] = '\0';
len = MAX_LEN_SYM_HOST_NAME-1;
}
setResolvedName(realClientHost, (char*)&bootProto.bp_vend[idx], FLAG_HOST_SYM_ADDR_TYPE_NAME);
realClientHost->hostResolvedName[len] = '\0';
bootProto.bp_vend[idx+len] = savechar;
idx += len;
break;
case 53: /* DHCP Message Type */
len = bootProto.bp_vend[idx++];
#ifdef FLAG_DHCP_DEBUG
traceEvent(CONST_TRACE_INFO, "DHCP Message Type: %d", bootProto.bp_vend[idx]);
#endif
switch((int)bootProto.bp_vend[idx]) {
case FLAG_DHCP_DISCOVER_MSG:
incrementTrafficCounter(&realClientHost->protocolInfo->dhcpStats->dhcpMsgSent[FLAG_DHCP_DISCOVER_MSG], 1);
break;
case FLAG_DHCP_OFFER_MSG:
incrementTrafficCounter(&realClientHost->protocolInfo->dhcpStats->dhcpMsgSent[FLAG_DHCP_OFFER_MSG], 1);
break;
case FLAG_DHCP_REQUEST_MSG:
incrementTrafficCounter(&realClientHost->protocolInfo->dhcpStats->dhcpMsgSent[FLAG_DHCP_REQUEST_MSG], 1);
break;
case FLAG_DHCP_DECLINE_MSG:
incrementTrafficCounter(&realClientHost->protocolInfo->dhcpStats->dhcpMsgSent[FLAG_DHCP_DECLINE_MSG], 1);
break;
case FLAG_DHCP_ACK_MSG:
incrementTrafficCounter(&realClientHost->protocolInfo->dhcpStats->dhcpMsgSent[FLAG_DHCP_ACK_MSG], 1);
break;
case FLAG_DHCP_NACK_MSG:
incrementTrafficCounter(&realClientHost->protocolInfo->dhcpStats->dhcpMsgSent[FLAG_DHCP_NACK_MSG], 1);
break;
case FLAG_DHCP_RELEASE_MSG:
incrementTrafficCounter(&realClientHost->protocolInfo->dhcpStats->dhcpMsgSent[FLAG_DHCP_RELEASE_MSG], 1);
break;
case FLAG_DHCP_INFORM_MSG:
incrementTrafficCounter(&realClientHost->protocolInfo->dhcpStats->dhcpMsgSent[FLAG_DHCP_INFORM_MSG], 1);
break;
case FLAG_DHCP_UNKNOWN_MSG:
default:
incrementTrafficCounter(&realClientHost->protocolInfo->dhcpStats->dhcpMsgSent[FLAG_DHCP_UNKNOWN_MSG], 1);
break;
}
idx += len;
break;
default:
#ifdef DEBUG
traceEvent(CONST_TRACE_INFO, "Unknown DHCP option '%d'", (int)optionId);
#endif
len = bootProto.bp_vend[idx++];
idx += len;
break;
}
}
}
}
}
}
}
break;
}
}
/* ************************************ */
u_int16_t processDNSPacket(HostTraffic *srcHost, u_short sport,
const u_char *packetData,
u_int length,
short *isRequest,
short *positiveReply) {
DNSHostInfo hostPtr;
datum key_data, data_data;
char tmpBuf[96];
u_int16_t transactionId = 0;
int i, queryNameLength;
memset(tmpBuf, 0, sizeof(tmpBuf)); /* quiet Valgrind */
if(myGlobals.dnsCacheFile == NULL) return(-1); /* ntop is quitting... */
if((!myGlobals.runningPref.enablePacketDecoding)
||(packetData == NULL) /* packet too short ? */)
return(transactionId);
myGlobals.dnsSniffCount++;
memset(&hostPtr, 0, sizeof(DNSHostInfo));
transactionId = handleDNSpacket(srcHost, sport,
packetData, &hostPtr, length,
isRequest, positiveReply);
#ifdef DNS_SNIFF_DEBUG
if((hostPtr.queryType == T_A)
&& (hostPtr.queryName[0] != '\0')
&& (hostPtr.addrList[0] != '\0')) {
traceEvent(CONST_TRACE_INFO, "DNS_SNIFF_DEBUG: DNS %s for %s type %d", *isRequest ? "request" : "reply",
hostPtr.queryName, hostPtr.queryType);
for(i=0; i<MAX_ALIASES; i++)
if(hostPtr.aliases[i][0] != '\0') {
traceEvent(CONST_TRACE_INFO, "DNS_SNIFF_DEBUG: %s is alias %d of %s", hostPtr.aliases[i], i, hostPtr.name);
}
}
#endif
if(*isRequest) {
myGlobals.dnsSniffRequestCount++;
return(transactionId);
}
if(!*positiveReply) {
myGlobals.dnsSniffFailedCount++;
return(transactionId);
}
queryNameLength = strlen(hostPtr.queryName);
strtolower(hostPtr.queryName);
if((queryNameLength > 5)
&& (strncmp(&hostPtr.queryName[queryNameLength-5], ".arpa", 5) == 0)) {
myGlobals.dnsSniffARPACount++;
return(transactionId);
}
for(i=0; i<MAX_ADDRESSES; i++) {
/* Symbolic => Numeric */
if(hostPtr.addrList[i] != 0) {
StoredAddress addrStore;
int len;
memset(&addrStore, 0, sizeof(addrStore));
addrStore.recordCreationTime = myGlobals.actTime;
len = min(sizeof(addrStore.symAddress)-1, strlen(hostPtr.queryName));
memcpy(&addrStore.symAddress,
hostPtr.queryName, len);
addrStore.symAddress[len] = '\0';
addrStore.symAddressType = FLAG_HOST_SYM_ADDR_TYPE_NAME;
safe_snprintf(__FILE__, __LINE__, tmpBuf, sizeof(tmpBuf), "%u", ntohl(hostPtr.addrList[i]));
key_data.dptr = (void*)&tmpBuf;
key_data.dsize = strlen(key_data.dptr)+1;
data_data.dptr = (void*)&addrStore;
data_data.dsize = sizeof(addrStore);
#ifdef DNS_SNIFF_DEBUG
traceEvent(CONST_TRACE_INFO, "DNS_SNIFF_DEBUG: Sniffed DNS response: %s(%d) = %s(t=%d)",
key_data.dptr, key_data.dsize,
((StoredAddress *)data_data.dptr)->symAddress,
((StoredAddress *)data_data.dptr)->recordCreationTime);
#endif
if(myGlobals.dnsCacheFile == NULL) return(-1); /* ntop is quitting... */
gdbm_store(myGlobals.dnsCacheFile, key_data, data_data, GDBM_REPLACE);
myGlobals.dnsSniffStoredInCache++;
}
}
return(transactionId);
}
/* ******************************** */
void handleNetbios(HostTraffic *srcHost,
HostTraffic *dstHost,
u_short sport,
u_short dport,
u_int packetDataLength,
const u_char* packetData,
u_int length,
u_int hlen) {
u_char *data, *name, *p;
int nodeType, i, udpDataLen;
char *tmpdata = (char*)packetData + (hlen + sizeof(struct udphdr));
char nbName[64], domain[64];
int offset=0, displ, notEnoughData = 0;
if((!myGlobals.runningPref.enablePacketDecoding) ||
(srcHost->nonIPTraffic != NULL) /* Already set */
|| (packetData == NULL)) /* packet too short ? */
return;
udpDataLen = length - (hlen + sizeof(struct udphdr));
if(dport == 137 /* NetBIOS */) {
if(udpDataLen > 32) {
/* 32 bytes or less is not enough */
u_int8_t opcode;
opcode = (tmpdata[2] >> 3) & 0x0F;
data = (u_char*)malloc(udpDataLen);
memcpy(data, tmpdata, udpDataLen);
name = data + 12;
p = name;
if ((*p & 0xC0) == 0xC0) {
displ = p[1] + 255 * (p[0] & ~0xC0);
if((displ + 14) >= udpDataLen)
notEnoughData = 1;
else {
name = data + displ;
displ += 14;
offset = 2;
}
} else {
displ = 14;
while ((displ < udpDataLen) && (*p)) {
p += (*p)+1;
displ++;
}
if(displ < udpDataLen)
offset = ((char*)p - (char*)data) + 1;
else
notEnoughData = 1;
}
if(!notEnoughData) {
u_int8_t doDecode = 0;
nodeType = name_interpret((char*)name, nbName, udpDataLen-displ);
switch(opcode) {
case 0: /* Query */
switch(nodeType) {
case 0x1C: /* Domain Controller */
case 0x1E: /* Domain */
case 0x1B: /* Domain */
case 0x1D: /* Workgroup (I think) */
doDecode = 1;
break;
}
break;
case 5: /* Registration */
case 6: /* Release */
doDecode = 1;
break;
}
#ifdef DEBUG
traceEvent(CONST_TRACE_INFO, "Found: %s", nbName);
#endif
/* Set the domain/workgroup only when needed */
setNBnodeNameType(srcHost, (char)nodeType, opcode == 0 ? 1 : 0, nbName);
}
free(data);
}
} else if(dport == 138 /* NetBIOS */) {
if(udpDataLen > 32) {
/* 32 bytes or less is not enough */
data = (u_char*)malloc(udpDataLen);
memcpy(data, tmpdata, udpDataLen);
name = data + 14;
p = name;
if ((*p & 0xC0) == 0xC0) {
displ = p[1] + 255 * (p[0] & ~0xC0);
if((displ + 14) >= udpDataLen)
notEnoughData = 1;
else {
name = data + displ;
displ += 14;
offset = 2;
}
} else {
displ = 14;
while ((displ < udpDataLen) && (*p)) {
p += (*p)+1;
displ++;
}
if(displ < udpDataLen)
offset = ((char*)p - (char*)data) + 1;
else
notEnoughData = 1;
}
if(!notEnoughData) {
nodeType = name_interpret((char*)name, nbName, udpDataLen-displ);
if(nodeType != -1) {
setNBnodeNameType(srcHost, (char)nodeType, 0, nbName);
displ += offset; /* see ** */
if(displ < udpDataLen) {
name = data + offset; /* ** */
p = name;
if ((*p & 0xC0) == 0xC0) {
displ = hlen + 8 + (p[1] + 255 * (p[0] & ~0xC0));
if(displ < length)
name = (u_char*)((char*)packetData+displ);
else
notEnoughData = 1;
}
if(!notEnoughData) {
nodeType = name_interpret((char*)name, domain, length-displ);
if(nodeType != -1) {
for(i=0; domain[i] != '\0'; i++)
if(domain[i] == ' ') { domain[i] = '\0'; break; }
setNBnodeNameType(dstHost, (char)nodeType, 0, domain);
if(udpDataLen > 200) {
char *tmpBuffer = (char*)&data[151];
/*
We'll check if this this is
a browser announcments so we can
know more about this host
*/
if(strcmp(tmpBuffer, "\\MAILSLOT\\BROWSE") == 0) {
/* Good: this looks like a browser announcement */
if(((tmpBuffer[17] == 0x0F /* Local Master Announcement*/)
|| (tmpBuffer[17] == 0x01 /* Host Announcement*/))
&& (tmpBuffer[49] != '\0')) {
if(srcHost->nonIPTraffic == NULL) srcHost->nonIPTraffic = (NonIPTraffic*)calloc(1, sizeof(NonIPTraffic));
if(srcHost->nonIPTraffic->nbDescr != NULL)
free(srcHost->nonIPTraffic->nbDescr);
if(tmpBuffer[17] == 0x0F)
FD_SET(FLAG_HOST_TYPE_MASTER_BROWSER, &srcHost->flags);
srcHost->nonIPTraffic->nbDescr = strdup(&tmpBuffer[49]);
#ifdef DEBUG
traceEvent(CONST_TRACE_INFO, "Computer Info: '%s'", srcHost->nonIPTraffic->nbDescr);
#endif
}
}
}
}
}
}
}
}
free(data);
}
} else if((sport == 139) || (dport == 139)) {
if(udpDataLen > 32) {
/* 32 bytes or less is not enough */
data = (u_char*)malloc(udpDataLen);
memcpy(data, tmpdata, udpDataLen);
if(data[0] == 0x81) /* Session request */ {
char decodedStr[64];
int pos;
pos = 5;
decodeNBstring((char*)&data[5], decodedStr);
if(srcHost->nonIPTraffic == NULL) srcHost->nonIPTraffic = (NonIPTraffic*)calloc(1, sizeof(NonIPTraffic));
if(dstHost->nonIPTraffic == NULL) dstHost->nonIPTraffic = (NonIPTraffic*)calloc(1, sizeof(NonIPTraffic));
if((decodedStr[0] != '\0') && (dstHost->nonIPTraffic->nbHostName == NULL))
dstHost->nonIPTraffic->nbHostName = strdup(decodedStr); /* dst before src */
pos = 5+(2*strlen(decodedStr))+2;
decodeNBstring((char*)&data[pos], decodedStr);
if((decodedStr[0] != '\0') && (srcHost->nonIPTraffic->nbHostName == NULL))
srcHost->nonIPTraffic->nbHostName = strdup(decodedStr);
} else if((data[0] == 0x0) /* Message type: Session message */
&& (data[8] == 0x73) /* SMB Command: SMBsesssetupX */) {
#ifdef DEBUG
for(i=0; i<udpDataLen; i++)
printf("0x%X (%d)\n", data[i], i);
#endif
if(sport == 139) {
/* Response */
#ifdef DEBUG
printf("OS: %s\n", &data[45]);
#endif
if(srcHost->fingerprint == NULL) {
char buffer[64];
safe_snprintf(__FILE__, __LINE__, buffer, sizeof(buffer), ":%s", &data[45]);
accessAddrResMutex("makeHostLink");
srcHost->fingerprint = strdup(buffer);
releaseAddrResMutex();
}
} else /* dport == 139 */ {
/* Request */
char len;
len = data[51]+data[53]; /* ANSI and UNICODE pw length */
i = 65+len;
if(srcHost->nonIPTraffic == NULL) srcHost->nonIPTraffic = (NonIPTraffic*)calloc(1, sizeof(NonIPTraffic));
if(srcHost->nonIPTraffic->nbAccountName == NULL) srcHost->nonIPTraffic->nbAccountName = strdup((char*)&data[i]);
#ifdef DEBUG
printf("Account Name: %s\n", &data[i]);
#endif
while((data[i] != 0) && (i < sizeof(data))) i++;
i++;
#ifdef DEBUG
printf("Domain: %s\n", &data[i]);
#endif
if(srcHost->nonIPTraffic->nbDomainName == NULL) srcHost->nonIPTraffic->nbDomainName = strdup((char*)&data[i]);
while((data[i] != 0) && (i < sizeof(data))) i++;
i++;
#ifdef DEBUG
printf("OS: %s\n", &data[i]);
#endif
if(srcHost->fingerprint == NULL) {
char buffer[64];
safe_snprintf(__FILE__, __LINE__, buffer, sizeof(buffer), ":%s", &data[i]);
accessAddrResMutex("makeHostLink");
srcHost->fingerprint = strdup(buffer);
releaseAddrResMutex();
}
}
}
free(data);
}
}
}
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