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/*
* tcp_or_udp.c
*
* Copyright (C) 2011-22 - ntop.org
*
* nDPI is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* nDPI 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with nDPI. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "ndpi_api.h"
/* ndpi_main.c */
extern u_int8_t ndpi_is_tor_flow(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow);
u_int ndpi_search_tcp_or_udp_raw(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow,
u_int8_t protocol,
u_int32_t saddr, u_int32_t daddr, /* host endianess */
u_int16_t sport, u_int16_t dport) /* host endianess */
{
u_int16_t rc;
struct in_addr host;
if(protocol == IPPROTO_UDP) {
if((sport == dport) && (sport == 17500)) {
return(NDPI_PROTOCOL_DROPBOX);
}
}
if(flow)
return(flow->guessed_host_protocol_id);
else {
host.s_addr = htonl(saddr);
if((rc = ndpi_network_ptree_match(ndpi_struct, &host)) != NDPI_PROTOCOL_UNKNOWN)
return (rc);
host.s_addr = htonl(daddr);
return (ndpi_network_ptree_match(ndpi_struct, &host));
}
}
void ndpi_search_tcp_or_udp(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
u_int16_t sport, dport;
u_int proto;
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
if(flow->host_server_name[0] != '\0')
return;
if(ndpi_is_tor_flow(ndpi_struct, flow)) {
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_TOR, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
return;
}
if(packet->udp) sport = ntohs(packet->udp->source), dport = ntohs(packet->udp->dest);
else if(packet->tcp) sport = ntohs(packet->tcp->source), dport = ntohs(packet->tcp->dest);
else sport = dport = 0;
if(packet->iph /* IPv4 Only: we need to support packet->iphv6 at some point */) {
proto = ndpi_search_tcp_or_udp_raw(ndpi_struct,
flow,
packet->iph ? packet->iph->protocol :
packet->iphv6->ip6_hdr.ip6_un1_nxt,
ntohl(packet->iph->saddr),
ntohl(packet->iph->daddr),
sport, dport);
if(proto != NDPI_PROTOCOL_UNKNOWN)
ndpi_set_detected_protocol(ndpi_struct, flow, proto, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_MATCH_BY_PORT);
}
}
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