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Merged r27646 from nmap-npingchages: Add function to determine the tranport layer protocol in a chain of PacketElements

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luis
2013-03-29 13:46:14 +00:00
parent 62199a4666
commit d5fe922084
2 changed files with 57 additions and 0 deletions
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56
libnetutil/PacketParser.cc
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@@ -1708,3 +1708,59 @@ bool PacketParser::is_response(PacketElement *sent, PacketElement *rcvd){
if(PKTPARSERDEBUG)printf("%s(): The received packet was successfully matched with the sent packet.\n", __func__);
return true;
}
/* Tries to find a transport layer header in the supplied chain of
* protocol headers. On success it returns a pointer to a PacketElement
* of one of these types:
*
* HEADER_TYPE_TCP
* HEADER_TYPE_UDP
* HEADER_TYPE_ICMPv4
* HEADER_TYPE_ICMPv6
* HEADER_TYPE_SCTP
* HEADER_TYPE_ARP
*
* It returns NULL if no transport layer header is found.
*
* Note that this method onyl understands IPv4, IPv6 (and its
* extension headers) and Ethernet. If the supplied packet contains
* something different before the tranport layer, NULL will be returned.
* */
PacketElement *PacketParser::find_transport_layer(PacketElement *chain){
PacketElement *aux=chain;
/* Traverse the chain of PacketElements */
while(aux!=NULL){
switch(aux->protocol_id()){
/* If we have a link or a network layer header, skip it. */
case HEADER_TYPE_IPv6_HOPOPT:
case HEADER_TYPE_IPv4:
case HEADER_TYPE_IPv6:
case HEADER_TYPE_IPv6_ROUTE:
case HEADER_TYPE_IPv6_FRAG:
case HEADER_TYPE_IPv6_NONXT:
case HEADER_TYPE_IPv6_OPTS:
case HEADER_TYPE_ETHERNET:
case HEADER_TYPE_IPv6_MOBILE:
aux=aux->getNextElement();
break;
/* If we found the transport layer, return it. */
case HEADER_TYPE_TCP:
case HEADER_TYPE_UDP:
case HEADER_TYPE_ICMPv4:
case HEADER_TYPE_ICMPv6:
case HEADER_TYPE_SCTP:
case HEADER_TYPE_ARP:
return aux;
break;
/* Otherwise, the packet contains headers we don't understand
* so we just return NULL to indicate that no valid transport
* layer was found. */
default:
return NULL;
break;
}
}
return NULL;
} /* End of find_transport_layer() */