static void ndpi_search_steam(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
// struct ndpi_id_struct *src=ndpi_struct->src;
// struct ndpi_id_struct *dst=ndpi_struct->dst;
if (flow->l4.tcp.steam_stage == 0) {
if (packet->payload_packet_len == 4
&& ntohl(get_u_int32_t(packet->payload, 0)) <= 0x07
&& ntohs(packet->tcp->dest) >= 27030 && ntohs(packet->tcp->dest) <= 27040) {
flow->l4.tcp.steam_stage = 1 + packet->packet_direction;
NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct, NDPI_LOG_DEBUG, "steam stage 1\n");
return;
}
} else if (flow->l4.tcp.steam_stage == 2 - packet->packet_direction) {
if ((packet->payload_packet_len == 1 || packet->payload_packet_len == 5)
&& packet->payload[0] == 0x01) {
ndpi_int_steam_add_connection(ndpi_struct, flow);
NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct, NDPI_LOG_DEBUG, "steam detected\n");
return;
}
}
NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct, NDPI_LOG_DEBUG, "steam excluded.\n");
NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_STEAM);
}
static void ndpi_check_steam_udp3(struct ndpi_detection_module_struct
*ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
u_int32_t payload_len = packet->payload_packet_len;
/* Check if we so far detected the protocol in the request or not. */
if (flow->steam_stage3 == 0) {
NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct, NDPI_LOG_DEBUG,
"STEAM stage 0: \n");
if ((payload_len == 4) && (packet->payload[0] == 0x39)
&& (packet->payload[1] == 0x18)
&& (packet->payload[2] == 0x00)
&& (packet->payload[3] == 0x00)) {
NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct,
NDPI_LOG_DEBUG,
"Possible STEAM request detected, we will look further for the response...\n");
/* Encode the direction of the packet in the stage, so we will know when we need to look for the response packet. */
flow->steam_stage3 = packet->packet_direction + 1; // packet_direction 0: stage 1, packet_direction 1: stage 2
}
} else {
NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct, NDPI_LOG_DEBUG,
"STEAM stage %u: \n", flow->steam_stage3);
/* At first check, if this is for sure a response packet (in another direction. If not, do nothing now and return. */
if ((flow->steam_stage3 - packet->packet_direction) == 1) {
return;
}
/* This is a packet in another direction. Check if we find the proper response. */
if ((payload_len == 0)
|| ((payload_len == 8) && (packet->payload[0] == 0x3a)
&& (packet->payload[1] == 0x18)
&& (packet->payload[2] == 0x00)
&& (packet->payload[3] == 0x00))) {
NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct,
NDPI_LOG_DEBUG, "Found STEAM.\n");
ndpi_int_steam_add_connection(ndpi_struct, flow);
} else {
NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct,
NDPI_LOG_DEBUG,
"The reply did not seem to belong to STEAM, resetting the stage to 0...\n");
flow->steam_stage3 = 0;
}
}
}
static void ndpi_check_steam_http(struct ndpi_detection_module_struct
*ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
if (packet->user_agent_line.ptr != NULL
&& packet->user_agent_line.len >= 23
&& memcmp(packet->user_agent_line.ptr, "Valve/Steam HTTP Client",
23) == 0) {
NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct, NDPI_LOG_DEBUG,
"Found STEAM.\n");
ndpi_int_steam_add_connection(ndpi_struct, flow);
}
}
static void ndpi_check_steam_udp1(struct ndpi_detection_module_struct
*ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
u_int32_t payload_len = packet->payload_packet_len;
if ((payload_len > 0) && match_first_bytes(packet->payload, "VS01")) {
NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct, NDPI_LOG_DEBUG,
"Found STEAM.\n");
ndpi_int_steam_add_connection(ndpi_struct, flow);
return;
}
/* Check if we so far detected the protocol in the request or not. */
if (flow->steam_stage1 == 0) {
NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct, NDPI_LOG_DEBUG,
"STEAM stage 0: \n");
if ((payload_len > 0)
&& match_first_bytes(packet->payload, "\x31\xff\x30\x2e")) {
NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct,
NDPI_LOG_DEBUG,
"Possible STEAM request detected, we will look further for the response...\n");
/* Encode the direction of the packet in the stage, so we will know when we need to look for the response packet. */
flow->steam_stage1 = packet->packet_direction + 1; // packet_direction 0: stage 1, packet_direction 1: stage 2
return;
}
if ((payload_len > 0)
&& match_first_bytes(packet->payload, "\xff\xff\xff\xff")) {
NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct,
NDPI_LOG_DEBUG,
"Possible STEAM request detected, we will look further for the response...\n");
/* Encode the direction of the packet in the stage, so we will know when we need to look for the response packet. */
flow->steam_stage1 = packet->packet_direction + 3; // packet_direction 0: stage 3, packet_direction 1: stage 4
return;
}
} else if ((flow->steam_stage1 == 1) || (flow->steam_stage1 == 2)) {
NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct, NDPI_LOG_DEBUG,
"STEAM stage %u: \n", flow->steam_stage1);
/* At first check, if this is for sure a response packet (in another direction. If not, do nothing now and return. */
if ((flow->steam_stage1 - packet->packet_direction) == 1) {
return;
}
/* This is a packet in another direction. Check if we find the proper response. */
if ((payload_len > 0)
&& match_first_bytes(packet->payload, "\xff\xff\xff\xff")) {
NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct,
NDPI_LOG_DEBUG, "Found STEAM.\n");
ndpi_int_steam_add_connection(ndpi_struct, flow);
} else {
NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct,
NDPI_LOG_DEBUG,
"The reply did not seem to belong to STEAM, resetting the stage to 0...\n");
flow->steam_stage1 = 0;
}
} else if ((flow->steam_stage1 == 3) || (flow->steam_stage1 == 4)) {
NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct, NDPI_LOG_DEBUG,
"STEAM stage %u: \n", flow->steam_stage1);
/* At first check, if this is for sure a response packet (in another direction. If not, do nothing now and return. */
if ((flow->steam_stage1 - packet->packet_direction) == 3) {
return;
}
/* This is a packet in another direction. Check if we find the proper response. */
if ((payload_len > 0)
&& match_first_bytes(packet->payload, "\x31\xff\x30\x2e")) {
NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct,
NDPI_LOG_DEBUG, "Found STEAM.\n");
ndpi_int_steam_add_connection(ndpi_struct, flow);
} else {
NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct,
NDPI_LOG_DEBUG,
"The reply did not seem to belong to STEAM, resetting the stage to 0...\n");
flow->steam_stage1 = 0;
}
}
}
