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Diffstat (limited to 'src/lib/protocols/steam.c')
-rw-r--r--src/lib/protocols/steam.c312
1 files changed, 26 insertions, 286 deletions
diff --git a/src/lib/protocols/steam.c b/src/lib/protocols/steam.c
index 4f5b88308..351279f59 100644
--- a/src/lib/protocols/steam.c
+++ b/src/lib/protocols/steam.c
@@ -1,11 +1,8 @@
/*
* steam.c
*
- * Copyright (C) 2011-22 - ntop.org
+ * Copyright (C) 2011-24 - ntop.org
* Copyright (C) 2014 Tomasz Bujlow <tomasz@skatnet.dk>
- *
- * The signature is mostly based on the Libprotoident library
- * except the detection of HTTP Steam flows.
*
* This file is part of nDPI, an open source deep packet inspection
* library based on the OpenDPI and PACE technology by ipoque GmbH
@@ -24,6 +21,7 @@
* along with nDPI. If not, see <http://www.gnu.org/licenses/>.
*
*/
+
#include "ndpi_protocol_ids.h"
#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_STEAM
@@ -31,296 +29,38 @@
#include "ndpi_api.h"
#include "ndpi_private.h"
-static void ndpi_int_steam_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
- ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_STEAM, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
-}
-
-static void ndpi_check_steam_http(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
- struct ndpi_packet_struct *packet = &ndpi_struct->packet;
-
- NDPI_PARSE_PACKET_LINE_INFO(ndpi_struct, 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_INFO(ndpi_struct, "found STEAM\n");
- ndpi_int_steam_add_connection(ndpi_struct, flow);
- }
-}
-
-static void ndpi_check_steam_tcp(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
- struct ndpi_packet_struct *packet = &ndpi_struct->packet;
- u_int32_t payload_len = packet->payload_packet_len;
-
- if (flow->steam_stage == 0) {
- NDPI_LOG_DBG2(ndpi_struct, "STEAM stage 0: \n");
-
- if ((payload_len == 1 && packet->payload[0] == 0x01) || ((payload_len == 4 || payload_len == 5) && ndpi_match_strprefix(packet->payload, payload_len, "\x01\x00\x00\x00"))) {
- NDPI_LOG_DBG2(ndpi_struct, "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_stage = packet->packet_direction + 1; // packet_direction 0: stage 1, packet_direction 1: stage 2
- return;
- }
-
- if ((payload_len == 1 && packet->payload[0] == 0x00) || ((payload_len == 4 || payload_len == 5) && ndpi_match_strprefix(packet->payload, payload_len, "\x00\x00\x00"))) {
- NDPI_LOG_DBG2(ndpi_struct, "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_stage = packet->packet_direction + 3; // packet_direction 0: stage 3, packet_direction 1: stage 4
+static void ndpi_search_steam(struct ndpi_detection_module_struct *ndpi_struct,
+ struct ndpi_flow_struct *flow)
+{
+ struct ndpi_packet_struct const * const packet = &ndpi_struct->packet;
+
+ NDPI_LOG_DBG(ndpi_struct, "search Steam\n");
+
+ /* Steam In-Home Streaming Discovery */
+ if (packet->payload_packet_len >= 40)
+ {
+ if (le64toh(get_u_int64_t(packet->payload, 0)) == 0xA05F4C21FFFFFFFF)
+ {
+ NDPI_LOG_INFO(ndpi_struct, "found Steam In-Home Streaming Discovery\n");
+ ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_STEAM,
+ NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
return;
}
- } else if ((flow->steam_stage == 1) || (flow->steam_stage == 2)) {
- NDPI_LOG_DBG2(ndpi_struct, "STEAM stage %u: \n", flow->steam_stage);
-
- /* At first check, if this is for sure a response packet (in another direction. If not, do nothing now and return. */
- if ((flow->steam_stage - packet->packet_direction) == 1) {
- return;
- }
-
- /* This is a packet in another direction. Check if we find the proper response. */
- if ((payload_len == 1 && packet->payload[0] == 0x00) || ((payload_len == 4 || payload_len == 5) && ndpi_match_strprefix(packet->payload, payload_len, "\x00\x00\x00"))) {
- NDPI_LOG_INFO(ndpi_struct, "found STEAM\n");
- ndpi_int_steam_add_connection(ndpi_struct, flow);
- } else {
- NDPI_LOG_DBG2(ndpi_struct, "The reply did not seem to belong to STEAM, resetting the stage to 0..\n");
- flow->steam_stage = 0;
- }
- } else if ((flow->steam_stage == 3) || (flow->steam_stage == 4)) {
- NDPI_LOG_DBG2(ndpi_struct, "STEAM stage %u: \n", flow->steam_stage);
-
- /* At first check, if this is for sure a response packet (in another direction. If not, do nothing now and return. */
- if ((flow->steam_stage - packet->packet_direction) == 3) {
- return;
- }
-
- /* This is a packet in another direction. Check if we find the proper response. */
- if ((payload_len == 1 && packet->payload[0] == 0x01) || ((payload_len == 4 || payload_len == 5) && ndpi_match_strprefix(packet->payload, payload_len, "\x01\x00\x00\x00"))) {
- NDPI_LOG_INFO(ndpi_struct, "found STEAM\n");
- ndpi_int_steam_add_connection(ndpi_struct, flow);
- } else {
- NDPI_LOG_DBG2(ndpi_struct, "The reply did not seem to belong to STEAM, resetting the stage to 0..\n");
- flow->steam_stage = 0;
- }
}
-}
-static void ndpi_check_steam_udp1(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
- struct ndpi_packet_struct *packet = &ndpi_struct->packet;
- u_int32_t payload_len = packet->payload_packet_len;
-
- if (ndpi_match_strprefix(packet->payload, payload_len, "VS01")) {
- NDPI_LOG_INFO(ndpi_struct, "found STEAM\n");
- ndpi_int_steam_add_connection(ndpi_struct, flow);
- return;
- }
-
- /* Check for Steam Datagram Relay (SDR) packets. */
- if (payload_len > 8) {
- u_int64_t n;
-
- /* Necessary as simple cast crashes on ARM */
- memcpy(&n, packet->payload, sizeof(u_int64_t));
-
- if(ndpi_ntohll(n) == 0x0101736470696e67 /* "\x01\x01sdping" */) {
- NDPI_LOG_INFO(ndpi_struct, "found STEAM (Steam Datagram Relay)\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_DBG2(ndpi_struct, "STEAM stage 0: \n");
-
- if (ndpi_match_strprefix(packet->payload, payload_len, "\x31\xff\x30\x2e")) {
- NDPI_LOG_DBG2(ndpi_struct, "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 (ndpi_match_strprefix(packet->payload, payload_len, "\xff\xff\xff\xff")) {
- NDPI_LOG_DBG2(ndpi_struct, "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;
- }
+ /* TODO: implement Steam Remote Play detection */
- } else if ((flow->steam_stage1 == 1) || (flow->steam_stage1 == 2)) {
- NDPI_LOG_DBG2(ndpi_struct, "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 (ndpi_match_strprefix(packet->payload, payload_len, "\xff\xff\xff\xff")) {
- NDPI_LOG_INFO(ndpi_struct, "found STEAM\n");
- ndpi_int_steam_add_connection(ndpi_struct, flow);
- } else {
- NDPI_LOG_DBG2(ndpi_struct, "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_DBG2(ndpi_struct, "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 (ndpi_match_strprefix(packet->payload, payload_len, "\x31\xff\x30\x2e")) {
- NDPI_LOG_INFO(ndpi_struct, "found STEAM\n");
- ndpi_int_steam_add_connection(ndpi_struct, flow);
- } else {
- NDPI_LOG_DBG(ndpi_struct, "The reply did not seem to belong to STEAM, resetting the stage to 0..\n");
- flow->steam_stage1 = 0;
- }
-
- }
-}
-
-static void ndpi_check_steam_udp2(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
- struct ndpi_packet_struct *packet = &ndpi_struct->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_stage2 == 0) {
- NDPI_LOG_DBG2(ndpi_struct, "STEAM stage 0: \n");
-
- if ((payload_len == 25) && ndpi_match_strprefix(packet->payload, payload_len, "\xff\xff\xff\xff")) {
- NDPI_LOG_DBG2(ndpi_struct, "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_stage2 = packet->packet_direction + 1; // packet_direction 0: stage 1, packet_direction 1: stage 2
- }
-
- } else {
- NDPI_LOG_DBG2(ndpi_struct, "STEAM stage %u: \n", flow->steam_stage2);
-
- /* At first check, if this is for sure a response packet (in another direction. If not, do nothing now and return. */
- if ((flow->steam_stage2 - packet->packet_direction) == 1) {
- return;
- }
-
- /* This is a packet in another direction. Check if we find the proper response. */
- if ((payload_len == 0) || ndpi_match_strprefix(packet->payload, payload_len, "\xff\xff\xff\xff")) {
- NDPI_LOG_INFO(ndpi_struct, "found STEAM\n");
- ndpi_int_steam_add_connection(ndpi_struct, flow);
- } else {
- NDPI_LOG_DBG2(ndpi_struct, "The reply did not seem to belong to STEAM, resetting the stage to 0..\n");
- flow->steam_stage2 = 0;
- }
-
- }
-}
-
-static void ndpi_check_steam_udp3(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
- struct ndpi_packet_struct *packet = &ndpi_struct->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_DBG2(ndpi_struct, "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_DBG2(ndpi_struct, "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_DBG2(ndpi_struct, "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 == 8) && (packet->payload[0] == 0x3a) && (packet->payload[1] == 0x18) && (packet->payload[2] == 0x00) && (packet->payload[3] == 0x00)) {
- NDPI_LOG_INFO(ndpi_struct, "found STEAM\n");
- ndpi_int_steam_add_connection(ndpi_struct, flow);
- } else {
- NDPI_LOG_DBG2(ndpi_struct, "The reply did not seem to belong to STEAM, resetting the stage to 0..\n");
- flow->steam_stage3 = 0;
- }
-
- }
+ NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
-static void ndpi_check_steamdiscover(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
- struct ndpi_packet_struct *packet = &ndpi_struct->packet;
- const u_int32_t payload_len = packet->payload_packet_len;
- const u_int64_t signature = ndpi_ntohll(0xffffffff214c5fa0);
-
- if (payload_len < 8)
- return;
-
- if (get_u_int64_t(packet->payload, 0) != signature)
- return;
-
- NDPI_LOG_INFO(ndpi_struct, "found STEAM (steamdiscover)\n");
- ndpi_int_steam_add_connection(ndpi_struct, flow);
-}
-
-static void ndpi_search_steam(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
- struct ndpi_packet_struct *packet = &ndpi_struct->packet;
-
- if(packet->udp != NULL) {
- if(flow->packet_counter > 5) {
- NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
- return;
- }
-
- ndpi_check_steam_udp1(ndpi_struct, flow);
-
- if(flow->detected_protocol_stack[0] == NDPI_PROTOCOL_STEAM)
- return;
-
- ndpi_check_steam_udp2(ndpi_struct, flow);
-
- if(flow->detected_protocol_stack[0] == NDPI_PROTOCOL_STEAM)
- return;
-
- ndpi_check_steam_udp3(ndpi_struct, flow);
-
- ndpi_check_steamdiscover(ndpi_struct, flow);
- } else {
- /* Break after 10 packets. */
- if(flow->packet_counter > 10) {
- NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
- return;
- }
-
- NDPI_LOG_DBG(ndpi_struct, "search STEAM\n");
- ndpi_check_steam_http(ndpi_struct, flow);
-
- if(flow->detected_protocol_stack[0] == NDPI_PROTOCOL_STEAM)
- return;
-
- ndpi_check_steam_tcp(ndpi_struct, flow);
-
- if(flow->detected_protocol_stack[0] == NDPI_PROTOCOL_STEAM)
- return;
- }
-}
-
-
-void init_steam_dissector(struct ndpi_detection_module_struct *ndpi_struct,
- u_int32_t *id) {
+void init_steam_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
+{
ndpi_set_bitmask_protocol_detection("Steam", ndpi_struct, *id,
- NDPI_PROTOCOL_STEAM,
- ndpi_search_steam,
- NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
- SAVE_DETECTION_BITMASK_AS_UNKNOWN,
- ADD_TO_DETECTION_BITMASK);
+ NDPI_PROTOCOL_STEAM,
+ ndpi_search_steam,
+ NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
+ SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+ ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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