Initial import from SVN

1 files changed, 211 insertions, 0 deletions

diff --git a/src/lib/protocols/edonkey.c b/src/lib/protocols/edonkey.c
new file mode 100644
index 000000000..d452c7348
--- /dev/null
+++ b/src/lib/protocols/edonkey.c
@@ -0,0 +1,211 @@
+/*
+ * edonkey.c
+ *
+ * Copyright (C) 2014 Tomasz Bujlow <tomasz@skatnet.dk>
+ *
+ * The signature is based on the Libprotoident library.
+ *
+ * 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_EDONKEY
+static void ndpi_int_edonkey_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
+  ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_EDONKEY, NDPI_REAL_PROTOCOL);
+}
+
+static int ndpi_edonkey_payload_check(const u_int8_t *data, u_int32_t len) {
+  
+  if ((len >= 4) && (data[0] == 0xe3) && (data[2] == 0x00) && (data[3] == 0x00))
+	return 1;
+  
+  if ((len >= 4) && (data[0] == 0xc5) && (data[2] == 0x00) && (data[3] == 0x00))
+	return 1;  
+  
+  if ((len >= 2) && (data[0] == 0xe5) && (data[1] == 0x43))
+	return 1;
+  
+  if ((len >= 4) && (data[0] == 0xe5) && (data[1] == 0x08) && (data[2] == 0x78) && (data[3] == 0xda))
+	return 1;
+
+  if ((len >= 4) && (data[0] == 0xe5) && (data[1] == 0x28) && (data[2] == 0x78) && (data[3] == 0xda))
+	return 1;
+
+  if ((len >= 2) && (data[0] == 0xc5) && (data[1] == 0x90))
+	return 1;
+
+  if ((len >= 2) && (data[0] == 0xc5) && (data[1] == 0x91))
+	return 1;
+
+  if ((len == 2) && (data[0] == 0xc5) && (data[1] == 0x92))
+	return 1;
+
+  if ((len == 2) && (data[0] == 0xc5) && (data[1] == 0x93))
+	return 1;
+
+  if ((len >= 38 && len <= 70) && (data[0] == 0xc5) && (data[1] == 0x94))
+	return 1;
+
+  if ((len >= 2) && (data[0] == 0xe3) && (data[1] == 0x9a))
+	return 1;
+
+  if ((len >= 2) && (data[0] == 0xe3) && (data[1] == 0x9b))
+	return 1;
+
+  if ((len == 6) && (data[0] == 0xe3) && (data[1] == 0x96))
+	return 1;
+
+  if ((len <= 34 && ((len - 2) % 4 == 0)) && (data[0] == 0xe3) && (data[1] == 0x97))
+	return 1;
+
+  if ((len >= 2) && (data[0] == 0xe3) && (data[1] == 0x92))
+	return 1;
+
+  if ((len >= 2) && (data[0] == 0xe3) && (data[1] == 0x94))
+	return 1;
+
+  if ((len >= 2) && (data[0] == 0xe3) && (data[1] == 0x98))
+	return 1;
+
+  if ((len >= 2) && (data[0] == 0xe3) && (data[1] == 0x99))
+	return 1;
+
+  if ((len == 6) && (data[0] == 0xe3) && (data[1] == 0xa2))
+	return 1;
+
+  if ((len >= 2) && (data[0] == 0xe3) && (data[1] == 0xa3))
+	return 1;
+
+  if ((len == 27) && (data[0] == 0xe4) && (data[1] == 0x00))
+	return 1;
+
+  if ((len == 529) && (data[0] == 0xe4) && (data[1] == 0x08))
+	return 1;
+
+  if ((len == 18) && (data[0] == 0xe4) && (data[1] == 0x01) && (data[2] == 0x00) && (data[3] == 0x00))
+	return 1;
+
+  if ((len == 523) && (data[0] == 0xe4) && (data[1] == 0x09))
+	return 1;
+
+  if ((len == 35) && (data[0] == 0xe4) && (data[1] == 0x21))
+	return 1;
+
+  if ((len == 19) && (data[0] == 0xe4) && (data[1] == 0x4b))
+	return 1;
+
+  if ((len >= 2) && (data[0] == 0xe4) && (data[1] == 0x11))
+	return 1;
+
+  if ((len == 22 || len == 38 || len == 28) && (data[0] == 0xe4) && (data[1] == 0x19))
+	return 1;
+
+  if ((len == 35) && (data[0] == 0xe4) && (data[1] == 0x20))
+	return 1;
+
+  if ((len == 27) && (data[0] == 0xe4) && (data[1] == 0x18))
+	return 1;
+
+  if ((len == 27) && (data[0] == 0xe4) && (data[1] == 0x10))
+	return 1;
+
+  if ((len == 6) && (data[0] == 0xe4) && (data[1] == 0x58))
+	return 1;
+
+  if ((len == 4) && (data[0] == 0xe4) && (data[1] == 0x50))
+	return 1;
+
+  if ((len == 36) && (data[0] == 0xe4) && (data[1] == 0x52))
+	return 1;
+
+  if ((len == 48) && (data[0] == 0xe4) && (data[1] == 0x40))
+	return 1;
+
+  if ((len == 225) && (data[0] == 0xe4) && (data[1] == 0x43))
+	return 1;
+
+  if ((len == 19) && (data[0] == 0xe4) && (data[1] == 0x48))
+	return 1;
+
+  if ((len == 119 || len == 69 || len == 294) && (data[0] == 0xe4) && (data[1] == 0x29))
+	return 1;
+
+  if ((len == 119 || len == 69 || len == 294 || len == 44 || len == 269) && (data[0] == 0xe4) && (data[1] == 0x28))
+	return 1;
+
+  return 0;
+}
+
+static void ndpi_check_edonkey(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;
+
+  /* Break after 20 packets. */
+  if (flow->packet_counter > 20) {
+    NDPI_LOG(NDPI_PROTOCOL_EDONKEY, ndpi_struct, NDPI_LOG_DEBUG, "Exclude EDONKEY.\n");
+    NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_EDONKEY);
+    return;
+  }
+
+  /* Check if we so far detected the protocol in the request or not. */
+  if (flow->edonkey_stage == 0) {
+    NDPI_LOG(NDPI_PROTOCOL_EDONKEY, ndpi_struct, NDPI_LOG_DEBUG, "EDONKEY stage 0: \n");
+
+    if (ndpi_edonkey_payload_check(packet->payload, payload_len)) {
+      NDPI_LOG(NDPI_PROTOCOL_EDONKEY, ndpi_struct, NDPI_LOG_DEBUG, "Possible EDONKEY 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->edonkey_stage = packet->packet_direction + 1;
+    }
+
+  } else {
+    NDPI_LOG(NDPI_PROTOCOL_EDONKEY, ndpi_struct, NDPI_LOG_DEBUG, "EDONKEY stage %u: \n", flow->edonkey_stage);
+
+    /* At first check, if this is for sure a response packet (in another direction. If not, do nothing now and return. */
+    if ((flow->edonkey_stage - packet->packet_direction) == 1) {
+      return;
+    }
+
+    /* This is a packet in another direction. Check if we find the proper response. */
+    if ((payload_len == 0) || (ndpi_edonkey_payload_check(packet->payload, payload_len))) {
+      NDPI_LOG(NDPI_PROTOCOL_EDONKEY, ndpi_struct, NDPI_LOG_DEBUG, "Found EDONKEY.\n");
+      ndpi_int_edonkey_add_connection(ndpi_struct, flow);
+    } else {
+      NDPI_LOG(NDPI_PROTOCOL_EDONKEY, ndpi_struct, NDPI_LOG_DEBUG, "The reply did not seem to belong to EDONKEY, resetting the stage to 0...\n");
+      flow->edonkey_stage = 0;
+    }
+
+  }
+}
+
+void ndpi_search_edonkey(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
+  struct ndpi_packet_struct *packet = &flow->packet;
+
+  NDPI_LOG(NDPI_PROTOCOL_EDONKEY, ndpi_struct, NDPI_LOG_DEBUG, "EDONKEY detection...\n");
+
+  /* skip marked packets */
+  if (packet->detected_protocol_stack[0] != NDPI_PROTOCOL_EDONKEY) {
+    if (packet->tcp_retransmission == 0) {
+      ndpi_check_edonkey(ndpi_struct, flow);
+    }
+  }
+}
+
+#endif