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/*
* jabber.c
*
* Copyright (C) 2009-11 - ipoque GmbH
* Copyright (C) 2011-22 - ntop.org
*
* This file is part of nDPI, an open source deep packet inspection
* library based on the OpenDPI and PACE technology by ipoque GmbH
*
* 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_protocol_ids.h"
#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_JABBER
#include "ndpi_api.h"
#include "ndpi_private.h"
struct jabber_string {
char *string;
u_int ndpi_protocol;
};
static struct jabber_string jabber_strings[] = {
{ "='im.truphone.com'", NDPI_PROTOCOL_TRUPHONE },
{ "=\"im.truphone.com\"", NDPI_PROTOCOL_TRUPHONE },
{ NULL, 0 }
};
static void ndpi_int_jabber_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow,
u_int32_t protocol, ndpi_confidence_t confidence)
{
ndpi_set_detected_protocol(ndpi_struct, flow, protocol, NDPI_PROTOCOL_UNKNOWN, confidence);
}
static void check_content_type_and_change_protocol(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow, u_int16_t x)
{
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
int i, left = packet->payload_packet_len-x;
if(left <= 0) return;
for(i=0; jabber_strings[i].string != NULL; i++) {
if(ndpi_strnstr((const char*)&packet->payload[x], jabber_strings[i].string, left) != NULL) {
ndpi_int_jabber_add_connection(ndpi_struct, flow, jabber_strings[i].ndpi_protocol, NDPI_CONFIDENCE_DPI);
return;
}
}
}
static void ndpi_search_jabber_tcp(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
u_int16_t const max_packets = 4;
size_t i;
static uint8_t const valid_patterns[] = { 0x25, 0x26, 0x30 };
NDPI_LOG_DBG(ndpi_struct, "search JABBER\n");
if (packet->payload_packet_len >= 3 &&
packet->payload[1] == 0x00 && packet->payload[2] == packet->payload_packet_len)
{
/* Old style Jabber/XMPP SSL. */
if (flow->packet_counter > max_packets - 1)
{
ndpi_int_jabber_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_JABBER, NDPI_CONFIDENCE_DPI);
return;
}
for (i = 0; i < NDPI_ARRAY_LENGTH(valid_patterns); ++i)
{
if (packet->payload[0] == valid_patterns[i])
{
return;
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
/* search for jabber here */
/* this part is working asymmetrically */
if (packet->payload_packet_len >= NDPI_STATICSTRING_LEN("<presence ") &&
memcmp(packet->payload, "<presence ", NDPI_STATICSTRING_LEN("<presence ")) == 0 &&
ndpi_strnstr((const char *)&packet->payload[0],
"xmlns='http://jabber.org/protocol/", packet->payload_packet_len) != NULL)
{
ndpi_int_jabber_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_JABBER, NDPI_CONFIDENCE_DPI);
return;
}
if (packet->payload_packet_len >= NDPI_STATICSTRING_LEN("<iq type='") &&
memcmp(packet->payload, "<iq type='", NDPI_STATICSTRING_LEN("<iq type='")) == 0 &&
ndpi_strnstr((const char *)&packet->payload[0],
"xmlns='http://jabber.org/protocol/commands'", packet->payload_packet_len) != NULL)
{
ndpi_int_jabber_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_JABBER, NDPI_CONFIDENCE_DPI);
return;
}
if (packet->payload_packet_len == NDPI_STATICSTRING_LEN("</stream:stream>") &&
memcmp(packet->payload, "</stream:stream>", NDPI_STATICSTRING_LEN("</stream:stream>")) == 0)
{
ndpi_int_jabber_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_JABBER, NDPI_CONFIDENCE_DPI);
return;
}
if ((packet->payload_packet_len > 13 && memcmp(packet->payload, "<?xml version=", 14) == 0)
|| (packet->payload_packet_len >= NDPI_STATICSTRING_LEN("<stream:stream ")
&& memcmp(packet->payload, "<stream:stream ", NDPI_STATICSTRING_LEN("<stream:stream ")) == 0)) {
int start = packet->payload_packet_len-13;
if(ndpi_strnstr((const char *)&packet->payload[13], "xmlns:stream='http://etherx.jabber.org/streams'", start)
|| ndpi_strnstr((const char *)&packet->payload[13], "xmlns:stream=\"http://etherx.jabber.org/streams\"", start)) {
/* Protocol family */
ndpi_int_jabber_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_JABBER, NDPI_CONFIDENCE_DPI);
/* search for subprotocols */
check_content_type_and_change_protocol(ndpi_struct, flow, 13);
}
return;
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
void init_jabber_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("Jabber", ndpi_struct, *id,
NDPI_PROTOCOL_JABBER,
ndpi_search_jabber_tcp,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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