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/*
* quic.c
*
* Copyright (C) 2012-16 - ntop.org
*
* Based on code of:
* Andrea Buscarinu - <andrea.buscarinu@gmail.com>
* Michele Campus - <campus@ntop.org>
*
* This module 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.
*
* This module 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.
* If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "ndpi_api.h"
#ifdef NDPI_PROTOCOL_QUIC
static int quic_ports(u_int16_t sport, u_int16_t dport)
{
if ((sport == 443 || dport == 443 || sport == 80 || dport == 80) &&
(sport != 123 && dport != 123))
return 1;
return 0;
}
/* ***************************************************************** */
static int quic_payload(const u_int8_t *payload) {
if((payload[0] == 'Q')
&& isdigit(payload[1])
&& isdigit(payload[2])
&& isdigit(payload[3]))
return(1);
return(0);
}
/* ***************************************************************** */
static int quic_len(u_int8_t l) {
switch(l) {
case 0:
return(1);
break;
case 1:
return(2);
break;
case 2:
return(4);
break;
case 3:
return(8);
break;
}
return(0); /* NOTREACHED */
}
/* ***************************************************************** */
void ndpi_search_quic(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
u_int32_t udp_len = packet->payload_packet_len;
u_int version_len = ((packet->payload[0] & 0x01) == 0) ? 0 : 4;
u_int cid_len = quic_len((packet->payload[0] & 0x0C) >> 2);
u_int seq_len = quic_len((packet->payload[0] & 0x30) >> 4);
u_int quic_hlen = 1 /* flags */ + version_len + seq_len + cid_len;
if(packet->udp != NULL
&& (udp_len > (quic_hlen+4 /* QXXX */))
&& ((packet->payload[0] & 0xC2) == 0x00)
&& (quic_ports(ntohs(packet->udp->source), ntohs(packet->udp->dest)))
) {
char *begin;
int i;
if((version_len > 0) && (packet->payload[1+cid_len] != 'Q'))
goto no_quic;
NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "found QUIC.\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_QUIC, NDPI_PROTOCOL_UNKNOWN);
if(!strncmp((char*)&packet->payload[quic_hlen+17], "CHLO" /* Client Hello */, 4)) {
/* Check if SNI (Server Name Indetification) is present */
for(i=quic_hlen+12; i<udp_len-3; i++) {
if((packet->payload[i] == 'S')
&& (packet->payload[i+1] == 'N')
&& (packet->payload[i+2] == 'I')
&& (packet->payload[i+3] == 0)) {
u_int32_t offset = *((u_int32_t*)&packet->payload[i+4]);
u_int32_t prev_offset = *((u_int32_t*)&packet->payload[i-4]);
int len = offset-prev_offset;
int sni_offset = i+prev_offset+1;
while((packet->payload[sni_offset] == '-') && (sni_offset < udp_len))
sni_offset++;
if((sni_offset+len) < udp_len) {
int max_len = sizeof(flow->host_server_name)-1, j = 0;
if(len > max_len) len = max_len;
while((len > 0) && (sni_offset < udp_len)) {
flow->host_server_name[j++] = packet->payload[sni_offset];
sni_offset++, len--;
}
}
break;
}
}
}
return;
}
no_quic:
NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "exclude QUIC.\n");
NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_QUIC);
}
/* ***************************************************************** */
void init_quic_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id,
NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
ndpi_set_bitmask_protocol_detection("QUIC", ndpi_struct, detection_bitmask, *id,
NDPI_PROTOCOL_QUIC, ndpi_search_quic,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
SAVE_DETECTION_BITMASK_AS_UNKNOWN, ADD_TO_DETECTION_BITMASK);
*id += 1;
}
#endif /* NDPI_PROTOCOL_QUIC */
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