diff options
Diffstat (limited to 'src/lib/protocols/csgo.c')
| -rw-r--r-- | src/lib/protocols/csgo.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/src/lib/protocols/csgo.c b/src/lib/protocols/csgo.c new file mode 100644 index 000000000..3bf0b4fe9 --- /dev/null +++ b/src/lib/protocols/csgo.c @@ -0,0 +1,126 @@ +/* + * csgo.c + * + * Copyright (C) 2016-2017 Vitaly Lavrov <vel21ripn@gmail.com> + * + * 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" + +#ifdef NDPI_PROTOCOL_CSGO + +#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_CSGO + +#include "ndpi_api.h" + +void ndpi_search_csgo(struct ndpi_detection_module_struct* ndpi_struct, struct ndpi_flow_struct* flow) { + struct ndpi_packet_struct* packet = &flow->packet; + + if (packet->udp != NULL) { + uint32_t w = htonl(get_u_int32_t(packet->payload, 0)); + NDPI_LOG_DBG2(ndpi_struct, "CSGO: word %08x\n", w); + + if (!flow->csgo_state && packet->payload_packet_len == 23 && w == 0xfffffffful) { + if (!memcmp(packet->payload + 5, "connect0x", 9)) { + flow->csgo_state++; + memcpy(flow->csgo_strid, packet->payload + 5, 18); + NDPI_LOG_DBG2(ndpi_struct, "Found csgo connect0x\n"); + return; + } + } + if (flow->csgo_state == 1 && packet->payload_packet_len >= 42 && w == 0xfffffffful) { + if (!memcmp(packet->payload + 24, flow->csgo_strid, 18)) { + flow->csgo_state++; + ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_CSGO, NDPI_PROTOCOL_UNKNOWN); + NDPI_LOG_INFO( ndpi_struct, "found csgo connect0x reply\n"); + return; + } + } + if (packet->payload_packet_len == 8 && ( w == 0x3a180000 || w == 0x39180000) ) { + NDPI_LOG_INFO( ndpi_struct, "found csgo udp 8b\n"); + ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_CSGO, NDPI_PROTOCOL_UNKNOWN); + return; + } + if (packet->payload_packet_len >= 36 && w == 0x56533031ul) { + NDPI_LOG_INFO( ndpi_struct, "found csgo udp\n"); + ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_CSGO, NDPI_PROTOCOL_UNKNOWN); + return; + } + if (packet->payload_packet_len >= 36 && w == 0x01007364) { + uint32_t w2 = htonl(get_u_int32_t(packet->payload, 4)); + if (w2 == 0x70696e67) { + NDPI_LOG_INFO( ndpi_struct, "found csgo udp ping\n"); + ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_CSGO, NDPI_PROTOCOL_UNKNOWN); + return; + } + } + if (flow->csgo_s2 < 3 && (w & 0xffff0000ul) == 0x0d1d0000) { + uint32_t w2 = get_u_int32_t(packet->payload, 2); + if (packet->payload_packet_len == 13) { + if (!flow->csgo_s2) { + flow->csgo_id2 = w2; + flow->csgo_s2 = 1; + NDPI_LOG_DBG2( ndpi_struct, "Found csgo udp 0d1d step1\n"); + return; + } + if (flow->csgo_s2 == 1 && flow->csgo_id2 == w2) { + NDPI_LOG_DBG2( ndpi_struct, "Found csgo udp 0d1d step1 DUP\n"); + return; + } + flow->csgo_s2 = 3; + return; + } + if (packet->payload_packet_len == 15) { + if (flow->csgo_s2 == 1 && flow->csgo_id2 == w2) { + NDPI_LOG_INFO( ndpi_struct, "found csgo udp 0d1d\n"); + ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_CSGO, NDPI_PROTOCOL_UNKNOWN); + return; + } + } + flow->csgo_s2 = 3; + } + if (packet->payload_packet_len >= 140 && (w == 0x02124c6c || w == 0x02125c6c) && + !memcmp(&packet->payload[3], "lta\000mob\000tpc\000bhj\000bxd\000tae\000urg\000gkh\000", 32)) { + NDPI_LOG_INFO( ndpi_struct, "found csgo dictionary udp\n"); + ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_CSGO, NDPI_PROTOCOL_UNKNOWN); + return; + } + if (packet->payload_packet_len >= 33 && packet->iph && packet->iph->daddr == 0xffffffff && + !memcmp(&packet->payload[17], "LanSearch", 9)) { + NDPI_LOG_INFO( ndpi_struct, "found csgo LanSearch udp\n"); + ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_CSGO, NDPI_PROTOCOL_UNKNOWN); + return; + } + } + if (flow->packet_counter > 20) + NDPI_EXCLUDE_PROTO(ndpi_struct, flow); +} + +void init_csgo_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask) +{ + ndpi_set_bitmask_protocol_detection("CSGO", ndpi_struct, detection_bitmask, *id, + NDPI_PROTOCOL_CSGO, + ndpi_search_csgo, + NDPI_SELECTION_BITMASK_PROTOCOL_UDP_WITH_PAYLOAD, + SAVE_DETECTION_BITMASK_AS_UNKNOWN, + ADD_TO_DETECTION_BITMASK); + + *id += 1; +} + +#endif |