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/*
* shoutcast.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_SHOUTCAST
#include "ndpi_api.h"
static void ndpi_int_shoutcast_add_connection(struct ndpi_detection_module_struct
*ndpi_struct, struct ndpi_flow_struct *flow)
{
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_SHOUTCAST, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
void ndpi_search_shoutcast_tcp(struct ndpi_detection_module_struct
*ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
NDPI_LOG_DBG(ndpi_struct, "search shoutcast\n");
if (flow->packet_counter == 1) {
/* this case in paul_upload_oddcast_002.pcap */
if (packet->payload_packet_len >= 6
&& packet->payload_packet_len < 80 && memcmp(packet->payload, "123456", 6) == 0) {
NDPI_LOG_DBG2(ndpi_struct, "Shoutcast stage 1, \"123456\"\n");
return;
}
if (flow->packet_counter < 3
&& flow->detected_protocol_stack[0] == NDPI_PROTOCOL_HTTP
) {
NDPI_LOG_DBG2(ndpi_struct,
"http detected, need next packet for shoutcast detection.\n");
if (packet->payload_packet_len > 4
&& get_u_int32_t(packet->payload, packet->payload_packet_len - 4) != htonl(0x0d0a0d0a)) {
NDPI_LOG_DBG2(ndpi_struct, "segmented packet found\n");
flow->l4.tcp.shoutcast_stage = 1 + packet->packet_direction;
}
return;
}
/* else
goto exclude_shoutcast; */
}
/* evtl. für asym detection noch User-Agent:Winamp dazunehmen. */
if (packet->payload_packet_len > 11 && memcmp(packet->payload, "ICY 200 OK\x0d\x0a", 12) == 0) {
NDPI_LOG_INFO(ndpi_struct, "found shoutcast by ICY 200 OK\n");
ndpi_int_shoutcast_add_connection(ndpi_struct, flow);
return;
}
if (flow->l4.tcp.shoutcast_stage == 1 + packet->packet_direction
&& flow->packet_direction_counter[packet->packet_direction] < 5) {
return;
}
if (flow->packet_counter == 2) {
if (packet->payload_packet_len == 2 && memcmp(packet->payload, "\x0d\x0a", 2) == 0) {
NDPI_LOG_DBG2(ndpi_struct, "Shoutcast stage 1 continuation\n");
return;
} else if (packet->payload_packet_len > 3 && memcmp(&packet->payload[0], "OK2", 3) == 0) {
NDPI_LOG_DBG2(ndpi_struct, "Shoutcast stage 2, OK2 found\n");
return;
} else
goto exclude_shoutcast;
} else if (flow->packet_counter == 3 || flow->packet_counter == 4) {
if (packet->payload_packet_len > 3 && memcmp(&packet->payload[0], "OK2", 3) == 0) {
NDPI_LOG_DBG2(ndpi_struct, "Shoutcast stage 2, OK2 found\n");
return;
} else if (packet->payload_packet_len > 4 && memcmp(&packet->payload[0], "icy-", 4) == 0) {
NDPI_LOG_INFO(ndpi_struct, "found Shoutcast\n");
ndpi_int_shoutcast_add_connection(ndpi_struct, flow);
return;
} else
goto exclude_shoutcast;
}
exclude_shoutcast:
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_shoutcast_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
ndpi_set_bitmask_protocol_detection("ShoutCast", ndpi_struct, detection_bitmask, *id,
NDPI_PROTOCOL_SHOUTCAST,
ndpi_search_shoutcast_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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