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; } } }