Initial import from SVN

1 files changed, 286 insertions, 0 deletions

diff --git a/src/lib/protocols/steam.c b/src/lib/protocols/steam.c
new file mode 100644
index 000000000..7911df85a
--- /dev/null
+++ b/src/lib/protocols/steam.c
@@ -0,0 +1,286 @@
+/*
+ * steam.c
+ *
+ * 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
+ *
+ * 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_api.h"
+
+#ifdef NDPI_PROTOCOL_STEAM
+static void ndpi_int_steam_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
+	ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_STEAM, NDPI_REAL_PROTOCOL);
+}
+
+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_tcp(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 (flow->steam_stage == 0) {
+	    NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct, NDPI_LOG_DEBUG, "STEAM stage 0: \n");
+	    
+	    	if (((payload_len == 1) || (payload_len == 4) || (payload_len == 5)) && match_first_bytes(packet->payload, "\x01\x00\x00\x00")) {
+			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_stage = packet->packet_direction + 1; // packet_direction 0: stage 1, packet_direction 1: stage 2
+			return;
+		}
+		
+		if (((payload_len == 1) || (payload_len == 4) || (payload_len == 5)) && (packet->payload[0] == 0x00) && (packet->payload[1] == 0x00) && (packet->payload[2] == 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_stage = packet->packet_direction + 3; // packet_direction 0: stage 3, packet_direction 1: stage 4
+			return;
+		}
+	} else if ((flow->steam_stage == 1) || (flow->steam_stage == 2)) {
+	  	NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct, NDPI_LOG_DEBUG, "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) || (payload_len == 4) || (payload_len == 5)) && (packet->payload[0] == 0x00) && (packet->payload[1] == 0x00) && (packet->payload[2] == 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_stage = 0;
+		}
+	} else if ((flow->steam_stage == 3) || (flow->steam_stage == 4)) {
+	  	NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct, NDPI_LOG_DEBUG, "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) || (payload_len == 4) || (payload_len == 5)) && match_first_bytes(packet->payload, "\x01\x00\x00\x00")) {
+			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_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 = &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;
+		}
+		
+	}
+}
+
+static void ndpi_check_steam_udp2(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_stage2 == 0) {
+		NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct, NDPI_LOG_DEBUG, "STEAM stage 0: \n");
+		
+		if ((payload_len == 25) && 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_stage2 = 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_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) || 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_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 = &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;
+		}
+		
+	}
+}
+
+void ndpi_search_steam(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
+	struct ndpi_packet_struct *packet = &flow->packet;
+	
+	/* Break after 20 packets. */
+	if (flow->packet_counter > 20) {
+		NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct, NDPI_LOG_DEBUG, "Exclude STEAM.\n");
+		NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_STEAM);
+		return;
+	}
+
+	/* skip marked or retransmitted packets */
+	if (packet->tcp_retransmission != 0) {
+		return;
+	}
+
+	if (packet->detected_protocol_stack[0] == NDPI_PROTOCOL_STEAM) {
+		return;
+	}
+
+	NDPI_LOG(NDPI_PROTOCOL_STEAM, ndpi_struct, NDPI_LOG_DEBUG, "STEAM detection...\n");
+	ndpi_check_steam_http(ndpi_struct, flow);
+	
+	if (packet->detected_protocol_stack[0] == NDPI_PROTOCOL_STEAM) {
+	    return;
+	}
+
+	ndpi_check_steam_tcp(ndpi_struct, flow);
+	
+	if (packet->detected_protocol_stack[0] == NDPI_PROTOCOL_STEAM) {
+	    return;
+	}
+	
+	ndpi_check_steam_udp1(ndpi_struct, flow);
+	
+	if (packet->detected_protocol_stack[0] == NDPI_PROTOCOL_STEAM) {
+	    return;
+	}
+	
+	ndpi_check_steam_udp2(ndpi_struct, flow);
+	
+	if (packet->detected_protocol_stack[0] == NDPI_PROTOCOL_STEAM) {
+	    return;
+	}
+	
+	ndpi_check_steam_udp3(ndpi_struct, flow);
+}
+
+#endif